List of Testing Instruments and Equipment for Commercial Concrete Mixing Plant

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The testing equipment of commercial concrete mixing plants can not only improve labor productivity, save cement, reduce costs, and minimize construction area, but also reduce urban pollution.

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The concrete mixing plant testing equipment provides free consultation on various related issues, offers corresponding technical guidance and cooperation, and has a well-trained, experienced, and strong after-sales service team. Once the product is sold, experienced technicians are dispatched to the site for free according to the user's requested date to guide installation, assist users in on-site debugging, guide load testing and trial operation, and train operators.

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Commercial concrete mixing plants and testing unit laboratories are generally divided into: cement room, concrete room, sand and gravel aggregate room, chemical analysis room, standard curing room, etc. Longhui Company has been researching, developing, producing, and selling laboratory instruments for concrete mixing plants for a long time, and has received good praise and recognition from a large number of users nationwide. Our company's fundamental principle remains unchanged: customer satisfaction, technological development, and talent cultivation.

Note: Our company can provide different grades and specifications of the same product to meet various customer needs. We can also provide on-site installation and training services, and strictly guarantee after-sales service. Welcome to visit our factory.

Xian County Longhui Highway and Railway Test Instrument Factory provides and price consultation.

Commercial concrete mixing plant testing equipmentequipList:（For details, pleasephone call）

Commercial concrete mixing plants and testing unit laboratories are generally divided into: cement room, concrete room, sand and gravel aggregate room, chemical analysis room, standard curing room, etc.

Note: Our company can provide different grades and specifications of the same product to meet various customer needs. We can also provide on-site installation and training services, and strictly guarantee after-sales service. Welcome to visit our factory.

Xian County Longhui Highway and Railway Test Instrument Factory provides professional services and price consultation.

List of Equipment Configuration for Commercial Concrete Mixing Plant Testing Instruments:（For details, please contact us by phone）

1. Standard for Test Methods of Mechanical Properties of Ordinary Concrete GB/T50081-2002

2. Design Specification for Mix Proportion of Ordinary Concrete JGJ55-2000
3. GBJ82-85 Test Method for Long term Performance and Durability of Ordinary Concrete
4. Standard for Concrete Strength Evaluation Method GBJ107-87
5. Code for Durability Design of Concrete Structures GB/T50476-2008
6. Design Specification for Mix Proportion of Masonry Mortar JGJ98-2000
7. Test Method for Basic Mechanical Properties of Building Mortar JGJ/T70-2009
8. GB/T1346-2001 Test Method for Water Consumption, Setting Time, and Stability of Cement Standard Consistency
9. GB/T17671-1999 Test Method for Strength of Cement Mortar (ISO Method)
10. Method for Testing the Fineness of Cement - Sieve Analysis Method GB/T1345-2005
11. Method for determination of flowability of cement mortar GB/T2419-2005
12. Method for determination of specific surface area of cement (Burgers method) GB/T8074-2008
13. Method for determination of cement density GB/T208-94
14. Fly Ash Used in Cement and Concrete GB/T1596-2005
15. Granulated blast furnace slag for use in cement GB/T203-2008
16. Granulated blast furnace slag powder for use in cement and concrete GB/T18046-2008

Special laboratory test projects and instrument configuration for ready mixed concrete enterprises (concrete mixing plants), special laboratory test projects and required instruments and equipment for ready mixed concrete enterprises:

1、 Test items and parameters:
（1） Test items: Inspection of raw materials such as cement, sand and gravel, additives, admixtures, and concrete.
（2） Experimental parameters:
1. Cement: sand strength, sand flowability, water consumption for standard consistency, setting time, stability, fineness, chloride ion content, alkali content.
2. Sand and gravel: particle size distribution, mud content, clay block content, crushing value index, apparent density, bulk density, needle like content, solidity, moisture content, fineness modulus, chloride ion content, harmful substance content, stone powder content.
3. Admixtures: water reduction rate, air content, setting time, compressive strength, chloride ion content, frost resistance, alkali content, pH value, limited expansion rate.
4. Admixtures: loss on ignition, fineness, water demand ratio, moisture content, density, strength, chloride ion content, flowability, sulfur trioxide content, free calcium oxide content, stability, specific surface area.
5. Concrete: slump, air content, setting time, pressure bleeding rate, strength (compressive, flexural), impermeability, frost resistance, chloride ion content.

2、 Precautions for use:

1. The actual testing equipment in the concrete mixing plant laboratory must not be directly exposed to the sun and must not have strong vibrations.
2. Good ventilation conditions are required, and the table on which the instrument is placed must be stable. The instrument is used at a room temperature of around 25 degrees Celsius.
3. Special attention should be paid to moisture and dust prevention, and the instrument should be covered with a dust cover when not in use.
4. If not used for a long time, each instrument must be turned on two to three times a week, with each startup lasting no less than half an hour.
5. High power electrical appliances should be powered by dedicated lines to avoid affecting the normal operation of other instruments.
6. The power supply must be stable, and the voltage fluctuation should not exceed 5%. If it exceeds this range, a regulated power supply must be used.
7. It must be cleaned every day to avoid too much dust affecting the normal operation of the instrument.

A commercial concrete mixing plant, also known as a commercial concrete plant, is commonly referred to as a concrete mixing plant or cement mixing plant by workers on construction sites. It mainly consists of five systems including a mixing host, material weighing system, material conveying system, material storage system, and control system, as well as other ancillary facilities. There are 10 categories, 32 models, and 28 additional functional options for commercial concrete mixing plants, which can meet the needs of commercial concrete in different application fields. According to the classification of application fields, commercial mixing stations mainly include commodity series, engineering series, hydraulic series, marine series, prefabricated series, etc. According to the structural classification, they mainly include fixed type (single mixing station, double mixing station, mixing building), mobile type, bucket lift type, container type, modular type, dual machine type, non host type, etc.

Selection of Site for Commercial Concrete Mixing Plant: Testing Instruments and Equipment for Concrete Mixing Plant

When selecting a site for a commercial concrete mixing plant, it should be ensured that the site is close to the quarry and sand plant, with sufficient water sources and away from residential areas. If the terrain of the mountain slope can be fully utilized and the material yard can be set on a higher ground level of the slope, the feeding height of the batching machine can be reduced, making the climbing angle of the loader smaller or unnecessary, which not only saves energy but also reduces wear and tear. When installing equipment foundations, attention should be paid to avoiding above ground and underground optical cables, power or communication cables.

It is recommended to choose a location with concentrated concrete volume and good road transportation conditions along the roadside. At the same time, areas close to the stone and sand plants and with sufficient water sources should be established within a 10km range of the project. For concrete volumes beyond the 10km transportation distance, the distance can be increased to 15km.

The principle is that the installation foundation of the commodity concrete mixing plant equipment should be selected in an open area to shorten the loading cycle of the loader. And ensure that transport vehicles and other vehicles can easily make U-turns. Suggested land area for the mixing plant: 15 acres for station 90, 20 acres for station 180, and 30 acres for station 240. The recommended accommodation standard for personnel is around 6m2. Transformer construction standards, weighing room construction standards, and fire protection construction standards shall be implemented in accordance with national industry standards.

When choosing a site, it is important to keep it away from residential areas, but not too remote. It is recommended to choose a road with smooth transportation, while also avoiding being too far from the stone and sand factories. Also remember to choose a location where the water source is more convenient. The installation foundation of concrete mixing plant equipment should be selected in an open area to shorten the loading cycle of the loader. And ensure that transport vehicles and other vehicles can easily make U-turns.

Secondly, when choosing the area of a concrete mixing plant, multiple factors should be considered, such as the model of the plant, the parking lot for transport vehicles, the amount of material accumulation, and the living area for workers. We need to take everything into consideration and implement it according to the industry standards of the country.

The yard area should be large enough to meet the engineering consumption requirements and facilitate the organization of material replenishment; Sand and gravel are stacked in different zones to prevent inaccurate material ratios caused by mixing; Equip loading vehicles to feed and neatly stack sand and gravel separately; The site should be hardened to facilitate loading vehicles and prevent soil and other debris from entering the material.

1、 Detailed explanation of concrete mixing plant:

The concrete mixing plant is mainly composed of five major systems including the mixing host, material weighing system, material conveying system, material storage system, and control system, as well as other ancillary facilities. Due to the reduction of four intermediate steps compared to station aggregate measurement, and the vertical feeding measurement, the measurement time is saved, greatly improving production efficiency.
Under the same model, the production efficiency of the mixing plant is one-third higher than that of the mixing plant. For example, the production efficiency of HLS90 building is equivalent to that of HZS120 station, the production efficiency of HLS120 building is equivalent to that of HZS180 station, and the production efficiency of HLS180 building is equivalent to that of HZS240 station.
A concrete mixing plant is a combined device used for centralized mixing of concrete, also known as a concrete prefabrication yard. Due to its high degree of mechanization and automation, it has high productivity and can ensure the quality of concrete while saving cement. It is commonly used in large and medium-sized water conservancy, power, bridge and other projects with large concrete engineering quantities, long construction periods, and concentrated construction sites. With the development of municipal construction, the use of centralized mixing and the provision of commercial concrete mixing plants has great potential, and has therefore developed rapidly, creating conditions for promoting concrete pumping construction and realizing the joint operation of mixing, conveying, and pouring machinery.
A concrete mixing plant is a building material manufacturing equipment consisting of five major components: a mixing host, a material weighing system, a material conveying system, a material storage system, a control system, and other ancillary facilities. Its main working principle is to use cement as the bonding material to mix and mix raw materials such as sand, lime, and coal slag, and finally produce concrete, which is used as wall material for construction and production. Since its commissioning, concrete mixing plants have played an important role in China's construction and building materials industry, which is also determined by the inherent characteristics of concrete mixing plants.
The concrete mixing plant is mainly divided into four parts: sand and gravel feeding, powder feeding, water and admixture feeding, transmission mixing and storage. The equipment is made of integral steel structure casting, and high-quality H-beams not only have a beautiful and generous appearance, but also enhance the overall structural strength of the concrete mixing plant. The equipment is easy to install and can be applied to various complex terrain structures.
The concrete mixing plant has excellent mixing performance, and the equipment adopts a spiral double horizontal shaft forced mixing host. Not only can the mixer be strong, but it can also achieve good mixing effects for concrete with dry hardness, plasticity, and various proportions. And stir evenly, with high efficiency.
The concrete mixing plant not only has excellent mixing machines, but also various sophisticated accessories such as screw conveyors, measuring sensors, pneumatic components, etc. These components ensure the high reliability, accurate measuring skills, and long service life of the concrete mixing plant during operation. At the same time, each maintenance part of the concrete mixing plant is equipped with a walking platform or inspection ladder, and has sufficient operating space. The mixing host can be equipped with a high-pressure automatic cleaning system, which has automatic alarm functions for oil shortage and overheating, making it easy for equipment maintenance.
The concrete mixing plant has good environmental protection functions. During the operation of the machine, the powder operation is carried out in a fully enclosed system. The powder tank adopts efficient dust collectors/mist spraying methods to greatly reduce the pollution of dust to the environment. At the same time, the concrete mixing plant adopts noise reduction devices for the exhaust and discharge equipment of the pneumatic system to effectively reduce noise pollution.
The specifications and sizes of mixing plants are named based on their theoretical production per hour. Currently, the commonly used specifications in China are: HZS25、HZS35、HZS50、HZS60、HZS75、HZS90、HZS120、HZS150、HZS180、HZS240 Wait. For example, HZS25 refers to a mixing plant with a production capacity of 25 cubic meters per hour, and the main machine is a double horizontal shaft forced mixer. If the host uses a single horizontal axis, the model is HZD25.
Generally speaking, concrete mixing plants are divided into two categories: fixed mixing plants and mobile mixing plants, which are also the first classifications that many manufacturers distinguish during production. At present, most fixed mixing plants also adopt modular and easy to assemble design, mainly used in large commodity concrete manufacturers or concrete component related manufacturers. They can be used in large-scale engineering construction, characterized by strong production capacity, stable operation, and good anti-interference ability. The mobile mixing plant is pulled by a trailer unit, which has good maneuverability and makes production more flexible. It is generally used for various small and medium-sized temporary construction projects and can be rented out for personal use.
According to their usage, they can be divided into commercial concrete mixing plants and engineering concrete mixing plants. Commercial concrete mixing plants are mainly used for commercial purposes and should have high efficiency, economy, and meet environmental protection requirements. Engineering concrete mixing plants are used for their own purposes and should consider whether they are compatible with their own projects.
According to the layout process, it is generally divided into first-order and second-order types. The first-order type refers to the one-time lifting of sand, gravel, aggregates, cement, etc. to the roof material bin of the mixing plant. Various materials are processed from top to bottom according to the production process, and finally discharged from the bottom layer, which is more common in mixing buildings. This type of mixing plant is divided from top to bottom into a silo layer, a weighing layer, a mixing layer, and a discharge layer. The mixing efficiency is very high, but the construction difficulty is high, the demolition is inconvenient, and the investment is high. Compared to the first stage, the second stage mixing plant takes up more land and has slightly lower mixing efficiency after weighing the aggregates. However, it is easy to disassemble, has low manufacturing costs, is easy to install, and is widely used. Moreover, the improved production capacity of the second stage mixing plant can be comparable to that of the first stage.
According to the number of mixers, mixing plants can be divided into single machine mixing plants and double machine mixing plants. The model name of the double machine mixing plant is 2HZS series concrete mixing plant. For example, the 2HZS25 concrete mixing plant expresses that the theoretical production rate of a double machine mixing plant with two JS500 mixing machines is 2 * 25m ³/h. The double machine mixing plant is a good supplement to the same type of mixing plant.
According to the weighing method, it can be divided into independent weighing and cumulative weighing methods. Independent weighing will be equipped with a separate weighing unit for each material. After weighing each material, it will be added to the mixer for internal mixing. This weighing method has high accuracy, but the design is complex and the cost is high; Cumulative weighing is the process of adding all aggregates into a unified hopper, which is prone to accumulate errors and is not conducive to final production. Moreover, the more batching bins there are, the more likely deviations are to occur, making it unsuitable for large-scale engineering use. However, the structural design is simple and the cost is cheap.
Key points for selection: Performance grade of construction concrete; From this, choose what kind of mixing host to use. For water conservancy projects, a forced mixing host must be selected. In addition, batching stations and storage bins should be selected according to the types of concrete materials that can be mixed.
The workload and duration of concrete construction; Use these two parameters to choose which size of mixing plant to use. If the total concrete task quantity is M, the concrete pouring days are T, the daily working hours are H, and the utilization coefficient is K, then the specification of the mixing plant X=M/(T * H * K) should be selected, where K is 0.7-0.9. In the selection process, the transportation condition of the finished concrete should also be considered. For example, is it direct pumping or vehicle transportation. The volume of the conveying vehicle is also an important basis for determining the type of mixing plant.
Construction environment and construction objects; When choosing to purchase a concrete mixing plant, the impact of the construction object and construction environment should be fully considered to ensure smooth construction and construction quality. We suggest that you be prepared in the following situations.
When the construction site requires a large amount of one-time pouring, high quality requirements, and there are no nearby reinforcement mixing plants, choose two smaller mixing plants, or choose a dual machine configuration with one main and one auxiliary.
When the transportation on the construction site is inconvenient and maintenance personnel need to spend a lot of time entering and leaving the site, it is recommended to use dual machine stations of the same smaller specifications or prepare sufficient spare parts to ensure smooth construction progress.
When the construction site is relatively scattered but the distance between construction sites is not too far, the conveying radius of concrete mixer trucks should not exceed half an hour's drive, and the conveying radius of dump trucks should not exceed 10 minutes' drive. Multiple job numbers are used for centralized mixing to improve the utilization rate and construction economic benefits of the mixing plant.
Operator quality; Generally speaking, small mixing plants have simpler structures and control systems, so they have lower requirements for operation and maintenance personnel. However, larger stations have complex structures and high levels of automation, so they also have higher requirements for operators. So when purchasing a mixing plant, in addition to considering the previous factors, you should also consider this factor.
Configuration selection; In general, manufacturers have mature product formulations, such as specifications, quantities, varieties, etc. You can make special requests when placing an order for the product. We will do our best to meet your requirements. However, when choosing products, it is important to avoid being greedy and seeking perfection, as this can result in significant economic waste. In addition, when selecting products, in addition to referring to the prices of different manufacturers, special attention should also be paid to the preparation lists of different manufacturers. In addition to the specifications, varieties, and quantities mentioned above, the most important thing is the manufacturer of the supporting parts. Based on the above items, you can always choose the most suitable model for you. When choosing a model, do not pursue what is most suitable and meets your needs, because such a choice is more economical and effective.
Equipment: 1. Roadway speed: 24 km/h, calculated based on a round-trip distance of 24 km.
2. The loading time for concrete mixer trucks is 1/6 hour per truck for HZS120 machines and 7/30 hour per truck for HZS90 machines.
3. Unloading time of concrete mixer truck: 5 minutes.
4. For every truck of concrete transportation completed, HZS120 machine takes 1.25 hours and HZS90 machine takes 1.32 hours.
5. The number of vehicles that can be transported within 6 hours: HZS120 machine 6 × 1/1.25 ≈ 5 (vehicles), HZS90 machine 6 × 1/1.32 ≈ 4 (vehicles).
6. Complete the pouring of 320 m3 of concrete for the beam within 6 hours, and the number of transport vehicles required is 320 × 1/6.5 ≈ 50 (vehicles).
7. The equipment of concrete mixing and transportation vehicles should consider leaving a certain amount of empty tanks due to the need for road transportation. HZS120 mixing station, with a main machine capacity of 2m3, should be equipped with a 9m3 concrete mixing transport truck to accommodate 4 pallets of materials. The transportation distance is about 12KM, and 320 m3 of concrete for beam pouring can be completed within 6 hours. It is recommended to equip 10-11 concrete mixing trucks.
8. The main capacity of the HZS90 mixer station is 1.5 m3, and it is recommended to equip it with an 8 m3 concrete mixing transport truck for loading 5 plates of materials. The HZS90+HZS120 mixing station should be equipped with an 8 m3 concrete mixing transport truck to accommodate 4 pallets of material. The transportation distance is 12KM, and 320m3 of concrete for beam pouring can be completed within 6 hours. It is recommended to equip 13-14 concrete mixing and transportation vehicles.
Composition of mixing plant: The concrete mixing plant is mainly composed of five major systems including material storage system, material weighing system, material conveying system, mixing system, powder storage system, powder conveying system, powder metering system, water and admixture metering system and control system, as well as other ancillary facilities.
Mixing host: Mixing hosts are divided into forced mixing and self falling mixing according to their mixing methods. Forced mixer is the mainstream used in mixing plants both domestically and internationally, which can mix various types of concrete such as flowable, semi dry hard, and dry hard. Self falling mixing machines are mainly used to mix flowable concrete and are rarely used in mixing plants.
Forced mixers are divided into main shaft planetary mixers, single horizontal shaft mixers, and double horizontal shaft mixers according to their structural forms. And among them, the comprehensive performance of the double horizontal shaft forced mixer is particularly noteworthy.
Weighing system: The material weighing system is a key component that affects the quality and production cost of concrete, mainly divided into three parts: aggregate weighing, powder weighing, and liquid weighing. In general, mixing plants with a capacity of less than 20 cubic meters per hour adopt a stacking weighing method, that is, aggregates (sand, stone) are weighed with one scale, cement and fly ash are weighed with one scale, water and liquid additives are separately weighed, and then the liquid additives are added to the water weighing hopper for pre mixing. In mixing plants with a capacity of over 50 cubic meters per hour, independent weighing of each material is commonly used, and all weighing is carried out using electronic scales and microcomputer control. The weighing accuracy of aggregates is ± 2%, and the weighing accuracy of cement, powder, water, and additives all reaches ± 1%.
Conveyor system: Material conveying consists of three parts:
Aggregate conveying: There are two ways of conveying in the mixing plant: hopper conveying and belt conveying. The advantages of hopper lifting are small footprint and simple structure. The advantages of belt conveyor are long conveying distance, high efficiency, and low failure rate. Belt conveyor is mainly suitable for mixing plants with aggregate temporary storage warehouses, thereby improving the productivity of the mixing plant.
Powder conveying: The main powder materials available for concrete are cement, fly ash, and mineral powder. The commonly used powder conveying method is screw conveyor conveying, and large mixing plants use pneumatic conveying and scraper conveying. The advantages of spiral conveying are simple structure, low cost, and reliable use.
Liquid transportation: mainly refers to water and liquid additives, which are respectively transported by water pumps.
Storage system: The storage methods for materials available for concrete are basically the same. Outdoor stacking of aggregates (also available in enclosed silos for large commercial concrete mixing plants in cities); Powder is stored in a fully enclosed steel structure silo; Storage of admixtures in steel structure containers.
Control system: The control system of the mixing plant is the central nervous system of the entire equipment. The control system has different functions and configurations according to different user requirements and the size of the mixing plant. Generally, the control system for small mixing plants available on construction sites is simpler, while the system for large mixing plants is relatively more complex.
Type: Continuous: Most of the batch mixing plants on the market. The process flow is as follows: during production, prepare raw materials that are not greater than the mixing capacity of the mixer, and then add them to the mixer for mixing. After mixing, it is unloaded into the transport vehicle.
1、 Process technology
1) After starting production, each raw material starts the uniform batching process in order of its distance from the mixer inlet, and synchronously reaches the mixing tank mouth;
2) Each material enters the mixer inlet evenly in proportion;
3) The mixer rotates and stirs while pushing the material forward, and the material is stirred/pushed from the inlet to the outlet to become the finished product.
4) After production reaches the predetermined volume, each material stops in order of distance from the mixer inlet.
5) From the start of production to the end of production, batching, mixing/pushing, and discharging are carried out continuously.
2、 Characteristics
1) The host works smoothly: raw materials are evenly fed into the mixer over a relatively long period of time. Uninterrupted sudden feeding process.
2) Smooth loading of finished products: The concrete is uniformly loaded into the vehicle over a long period of time without any intermittent sudden unloading process.
3) Less space occupation: reduces the use of large finished product hoppers and aggregate storage hoppers, with low height and small footprint.
4) Low wear of wear-resistant parts: no impact, smooth mixing, and low mixing volume at the same time.
5) Low energy consumption: small installed power, low mixing volume, and a small amount of raw materials entering the mixer evenly, making it easy to mix evenly.
6) Low usage and maintenance costs: fewer structural components, shorter belts, and smooth operation.
3、 Five major system components
Sand and gravel system: includes three feeding sand and gravel buckets (two or four depending on different requirements), each used for measuring and feeding sand and gravel. Each sand and gravel hopper consists of a collection hopper, weighing sensor, reducer, feeding belt, and ancillary equipment.
Powder system: composed of storage bin, storage bin butterfly valve, lifting screw, measuring bin, disc feeder and other parts. The powder storage bin includes a main bin and a secondary bin, with a single capacity of 100T-300T. Both the main and auxiliary warehouses are equipped with automatic arch breaking devices and material level signal indication devices. The powder storage bin is also equipped with a dust removal system.
Water and admixture system: composed of admixture tank, water tank (or water tank), pump station, water and admixture weighing hopper and pipeline.
Transmission mixing storage system: composed of belt conveyor, mixer, and mixing frame. The sand and gravel are loaded onto the belt by the batching machine and enter the mixer. Fly ash and cement are directly fed into the mixer through the disc feeder and aggregate screw on the measuring bin.
Low voltage electrical appliances and automatic control system: including three main parts: power cabinet, sensors, and control center.
4、 Advantages
1. Large output and high efficiency: Continuous and stable operation, high single machine output of continuous mixing plant.
2. Mixing evenly: The mixture entering the mixer is a uniform material, and the mixing process of the mixture in the mixer is a mixing and hydration process, so the mixing time can be shortened.
3. No leakage and minimal wear: The feeding end of the continuous mixer is dry material mixing, and both shaft ends are equipped with reverse screws. Therefore, there is no leakage problem. The mixer also has low requirements for wear-resistant materials.
4. Low failure rate: The number of starts and stops of all equipment in a continuous mixing plant is only 1/7-1/3 of that in a intermittent mixing plant, so the equipment has a long service life and a low probability of failure.
Intermittent: Intermittent mixing plant system composition:
1. The mixing system is a double horizontal shaft mixer assembled with multi-dimensional key components from abroad, and users can also use other foreign mixers.
2. Measurement system for aggregate measurement: The standard type adopts the incremental method for measurement, while the improved type adopts the electronic scale reduction method for measurement; Powder metering: Cement metering and fly ash metering buckets are installed above the mixer, and standard mixing plants use AC contactors to control the lifting screw without precision mixing devices; The improved mixing plant uses a frequency converter to achieve coarse and fine mixing of ingredients. Water measurement: Adopting a three-point suspension weighing mechanism, equipped with coarse and fine matching circuits and other devices to ensure measurement accuracy. Additive measurement: The sensor load is directly applied, equipped with coarse and fine matching circuits and separate metering boxes and pipelines to ensure accurate measurement.
3. The dust removal system mixing plant is equipped with an independent centralized dust collector for centralized processing, which has good dust removal effect and avoids the negative pressure formed in the mixing chamber that affects the powder measurement accuracy. The aggregate feeding system uses a feeding belt conveyor to lift the aggregate into the middle storage hopper at once. It has the characteristics of compact structure, high reliability, and easy maintenance.
4. The automatic control system adopts a distributed computer system to achieve centralized management and has reliability.
Technical advantages of improved concrete mixing plant: practical in five to two years
Five highs: High system configuration: The host can be equipped with internationally renowned brand products according to user requirements, or imported key components such as domestically assembled mixers can be selected.
High ingredient accuracy: Adopting frequency conversion technology to achieve coarse and fine blending of various materials. Coarse blending achieves 90-95% of the required dosage, while precision blending achieves ingredient accuracy better than 0.5%.
High reliability: The operating frequency of components such as cylinders is low, and the gearbox avoids the impact of hard start due to the use of frequency converter control, resulting in low failure rate and high reliability.
High productivity guarantee.
High cost-effectiveness: It has the performance of a mixing tower, but its price is only 1/3 to 1/2 of that of a mixing tower.
Practical: A practical data management system that saves real-time production data of the mixing plant. Equipped with * combination query and various report output functions, automatically printing delivery notes.
Practical slump monitoring system: Based on the displayed current curve of the mixer, the operator can intuitively determine the slump of the concrete using the practical slump monitoring system.
Structural characteristics of intermittent cement concrete mixing plant
The unloading port of the storage silo is relatively large, and the silo will not arch (the silo does not require a vibrator). The unloading speed is fast, the feeding time is short, and one truck of concrete can be produced with one feeding. The cylinder action frequency is small, and the service life is long.
The amount of material added from the storage bin to the measuring hopper does not affect the accuracy of the ingredients.
The batching time and lifting time are combined into one, with a shorter feeding time from the storage bin to the measuring hopper, and a longer batching time and lifting time. As a result, the sensor has sufficient stable response time, minimal ingredient overshoot, and low load lifting.
The speed of the strong pull belt is controlled by a computer and a frequency converter to achieve soft start stop, with minimal impact and less adhesive on the belt. Various aggregates are discharged, mixed, and loaded uniformly within a basically fixed time.
By using a frequency converter for speed regulation, high-precision batching can be achieved in a short period of time.
Working principle: The concrete mixing plant is divided into four parts: sand and gravel feeding, powder feeding (cement, fly ash, expansion agent, etc.), water and admixture feeding, and transportation mixing and storage The workflow is shown in Figure 1. After the mixer control system is powered on, it enters the human-machine interface for initialization processing, including formula number, concrete grade, slump, production volume, etc According to the weighing, detect each silo and measuring hopper, output a signal of empty or full material, and prompt the operator to determine whether to start the mixing control program Start the sand and stone belt motor to feed into the measuring hopper; Open the butterfly valves of the fly ash and cement tanks, start the screw motor to transport the fly ash and cement to the measuring hopper; Open the control valves of the water tank and additive pool to allow water and additives to flow into the measuring hopper After the measurement meets the set requirements, the measuring bucket door is opened, and the ingredients enter the started mixer for mixing. At the set time, the mixer door is opened, and the concrete enters the received mixer truck

1. Each cylinder, control valve, and motor must operate according to the requirements of the concrete mixing process, and the control of each cylinder, control valve, and motor must be accurate, stable, and reliable
2. The control system has two working modes, automatic and manual, and their relationship is independent yet mutually restrictive
3. The system has good anti-interference ability and * alarm self-protection function
4. By communicating with the computer, the system's working status and fault alarms can be displayed
Common faults: Air source failure:
(1) Air compressor faults include: damaged check valve, severe wear of piston ring, damaged intake valve plate, and clogged air filter.
To determine if the check valve is damaged, simply turn off the power after the air compressor has automatically stopped for more than ten seconds, and manually rotate the large tape roller. If it can be easily rotated once, it indicates that the check valve is not damaged; On the contrary, the check valve is damaged; In addition, it can also be judged from the exhaust situation of the exhaust port under the automatic pressure switch. Generally, the exhaust should be stopped after about ten seconds after the air compressor stops automatically. If the exhaust continues until the air compressor starts again, it means that the check valve is damaged and needs to be replaced.
When the pressure of the air compressor rises slowly and accompanied by oil leakage, it indicates that the piston ring of the air compressor has been severely worn and should be replaced in a timely manner.
When the intake valve plate is damaged or the air filter is clogged, it will also cause the pressure of the air compressor to rise slowly (but without oil leakage). When checking, place your palm on the air inlet of the air filter. If there is hot air blowing outwards, it indicates that the intake valve is damaged and needs to be replaced; If the suction is small, it is usually caused by a dirty air filter, and the filter should be cleaned or replaced.
(2) The faults of the pressure reducing valve include: inability to adjust the pressure high, or slow increase in pressure.
The inability to adjust the pressure is often caused by the breakage of the pressure regulating spring or diaphragm, and must be replaced with a new one; The slow increase in pressure is usually caused by clogged filter screens and should be removed for cleaning.
(3) Pipeline faults include leakage at pipeline joints, hose rupture, and accumulation of condensed water.
When there is a leak in the pipeline joint or a hose rupture, the location of the leak can be determined by the sound, and it should be repaired or replaced in a timely manner; If condensed water accumulates in the pipeline, it should be drained in a timely manner. The characteristic is that in winter in the north, condensed water is prone to freeze and block the air path.
(4) The faults of the compressed air processing component (triple unit) include: oil-water separator fault, pressure regulating valve and oil mist device fault.
The faults of oil-water separators can be further divided into situations such as clogged or damaged filter elements, and inflexible moving parts of the drain valve. Regularly clean the filter element during work to remove oil and impurities from the drain.
The malfunction of the pressure regulating valve is the same as the malfunction of the pressure reducing valve mentioned in (2) above.
The fault phenomena of the oil mist device include: no oil dripping, water deposition at the bottom of the oil cup, and damaged sealing ring at the mouth of the oil cup. When the oil mist device does not drip oil, check whether the air flow rate at the inlet is lower than the fogging flow rate, whether there is air leakage, and whether the oil volume adjustment needle valve is blocked; If moisture accumulates at the bottom of the oil cup, it should be promptly removed; When the sealing ring is damaged, it should be replaced in a timely manner.
Cylinder malfunction: Due to improper assembly and long-term use of the cylinder, pneumatic actuators (cylinders) are prone to internal and external leakage, insufficient output force and unstable movement, poor buffering effect, and damage to piston rods and cylinder heads.
(1) Internal and external leaks in a cylinder are generally caused by eccentric installation of the piston rod, insufficient supply of lubricating oil, wear or damage to the sealing ring and sealing ring, impurities in the cylinder, and scratches on the piston rod. Therefore, when there is internal or external leakage in the cylinder, the center of the piston rod should be readjusted to ensure the coaxiality between the piston rod and the cylinder barrel; Regularly check the reliability of the oil mist device to ensure good lubrication of the actuator components; When the sealing ring and sealing ring are worn or damaged, they must be replaced in a timely manner; If there are impurities in the cylinder, they should be removed in a timely manner; When there are scars on the piston rod, it should be replaced with a new one.
(2) The insufficient output force and unstable movement of the cylinder are generally caused by the piston or piston rod being stuck, poor lubrication, insufficient air supply, or condensation water and impurities in the cylinder. For this, the center of the piston rod should be adjusted; Check whether the operation of the oil mist device is reliable; Is the gas supply pipeline blocked. When there is condensed water and impurities in the cylinder, they should be removed in a timely manner.
(3) The poor buffering effect of the cylinder is generally caused by wear of the buffering sealing ring or damage to the adjusting screw. At this point, the sealing ring and adjusting screw should be replaced.
(4) Damage to the piston rod and cylinder head of a cylinder is usually caused by eccentric installation of the piston rod or ineffective buffering mechanism. For this, the center position of the piston rod should be adjusted; Replace the buffer seal ring or adjust the screw.
Reversing valve malfunction: The faults of the reversing valve include: the valve cannot reverse or the reversing action is slow, gas leakage, electromagnetic pilot valve malfunction, etc.
(1) The inability or slow switching action of the directional valve is generally caused by poor lubrication, spring jamming or damage, oil stains or impurities jamming the sliding parts, and other reasons. For this, it is necessary to first check whether the oil mist device is working properly; Is the viscosity of the lubricating oil appropriate. If necessary, the lubricating oil should be replaced, the sliding parts of the directional valve should be cleaned, or the spring and directional valve should be replaced.
(2) After prolonged use, directional valves are prone to wear on the valve core sealing ring, damage to the valve stem and seat, resulting in gas leakage inside the valve, slow valve movement, or inability to reverse direction normally. At this point, the sealing ring, valve stem, and valve seat should be replaced, or the directional valve should be replaced with a new one.
(3) If the inlet and outlet holes of the electromagnetic pilot valve are blocked by debris such as oil sludge, poorly sealed, the movable iron core is stuck, or there is a fault in the circuit, it can all cause the reversing valve to fail to reverse direction normally. For the first three situations, the oil sludge and impurities on the pilot valve and movable iron core should be cleaned. Circuit faults are generally divided into two categories: control circuit faults and electromagnetic coil faults. Before checking for circuit faults, the manual knob of the directional valve should be turned a few times to see if the directional valve can change direction normally under the rated air pressure. If it can change direction normally, it is a fault in the circuit. During inspection, an instrument can be used to measure the voltage of the electromagnetic coil to see if it has reached the rated voltage. If the voltage is too low, further inspection of the power supply and associated travel switch circuit in the control circuit should be carried out. If the reversing valve cannot reverse direction normally under rated voltage, the connector (plug) of the electromagnetic coil should be checked for looseness or loose contact. The method is to unplug the plug and measure the resistance of the coil (usually between a few hundred ohms and a few thousand ohms). If the resistance is too high or too low, it indicates that the electromagnetic coil is damaged and should be replaced.
Component failure: The main faults of pneumatic transmission components include oil mist device failure, automatic drain device failure, muffler failure, etc.
(1) The faults of the oil mist device include: the adjustment amount of the adjusting needle is too small, the oil circuit is blocked, and the pipeline leaks, which can prevent the liquid oil droplets from atomizing. Regarding this, blockages and leaks should be promptly addressed, and the oil drip rate should be adjusted to around 5 drops per minute. During normal use, the oil level in the oil cup should be kept within the upper and lower limits. The water deposited at the bottom of the oil cup should be promptly removed.
classification
1. According to their different structures, they can be divided into mobile mixing plants and fixed mixing buildings. Mobile mixing plants are suitable for construction sites.
2. According to their different forms of homework, they can be divided into two categories: periodic and continuous. The periodic feeding and discharging system operates in a certain cycle. Continuous feeding and discharging are carried out continuously. The current commonly used method is periodic.
3. According to their different process layout forms, they can be divided into two categories: single-stage and two-stage.
Single stage lifting of materials such as sand, stone, cement, etc. to the rooftop storage bin. Various materials are weighed, proportioned, and mixed according to the process flow until they are made into concrete mixing materials and loaded onto trucks for transportation. The mixing tower is divided from top to bottom into a silo layer, a weighing layer, a mixing layer, and a bottom layer. The single-stage process flow is reasonable and has high productivity, but it requires high factory requirements, so the investment is relatively large. This form is commonly used in mixing plants.
The storage bin and mixing equipment for two-stage materials are generally at the same level. The aggregate is lifted and sent to the storage bin for cumulative weighing and separate weighing, and then transported to the mixer for mixing using a lifting bucket or belt conveyor. Due to the need for two upgrades of materials, the productivity is relatively low, but it can reduce the height of the entire equipment, facilitate disassembly and assembly, and reduce investment. This form is commonly used in mixing plants.
Selection principle: The forced mixer has good mixing quality, strong overload capacity, no segregation during discharge, high production efficiency, and can adapt to concrete mixing with various properties. Commercial concrete mixing equipment commonly uses forced mixers, but their structures are complex and their operating costs are high. Forced mixers are divided into several forms: double horizontal shaft, single horizontal shaft, single vertical shaft, and planetary type. The double horizontal shaft mixer is very suitable for the production of commercial concrete due to its good mixing performance, high production efficiency, good adaptability, outstanding structural characteristics, and good reliability; Due to their structural characteristics and adaptability, single horizontal shaft mixers and single vertical shaft mixers are increasingly being used in commercial concrete mixing equipment; Planetary mixers are not commonly used and are more commonly found in imported equipment.
Quality Status: * In order to meet the requirements of large-scale engineering, large volume, and long-term continuous operation in China, the concrete double machine station has become an independently developed product in China. This device adopts a dual machine synchronous control system and a computer management system, and has now occupied more than 95% of the market for commercial concrete mixing plants in China.
Secondly, after nearly 20 years of use, selection, and standardization, the mixing host has become a key equipment for various concrete mixing in China, including the double horizontal axis forced mixer, vertical axis planetary mixer, and cone type reverse discharge mixer. The mixing process can achieve the required uniformity of concrete in 25-35 seconds.
Thirdly, Chinese enterprises can reach the level of garden enterprises in producing concrete, achieving dust, sewage, and residual concrete treatment *, and ensuring the supply of concrete with * management level.
Fourthly, China's concrete mixing plants have strong overload operation capacity, and can still start overloaded after 5 seconds of shutdown. When mixing cement and aggregates, the energy-saving effect is outstanding, which can meet the special requirements of long-term and large-scale production operation.
Fifthly, China's concrete mixing equipment is capable of mixing high-performance concrete with grades c30-c120. The measurement accuracy of different types of additives can meet the standard requirements, ensuring mechanized construction with large volume and high head for mixing and transportation.
Sixth, the lubrication and sealing properties of the mixing equipment are good, and the service life of the mixer blades and liners can reach over 60000 to 100000 cubic meters.
Seventh, China already has * national standards for ready mixed concrete and concrete machinery, which are among the world's leading standards. In addition, China has professional training machinery and training materials, greatly improving the preparation level of commercial concrete.
Import and Export: The concrete version of the weighbridge software is mainly designed for measuring and managing the raw material procurement, finished concrete sales, and asphalt mixture sales processes of concrete mixing plant enterprises. Includes: daily accumulation, monthly accumulation, quick conversion of tons, and convenient functions for real-time statistics. It can print purchase and sales scales, as well as two separate sets of serial numbers. Sales scales can print concrete scales with only cubic meters or asphalt factory scales with tonnage at the same time.
Equipment Management: Equipment:
The person in charge of mechanical and electrical equipment should guide, inspect, supervise, and have drivers perform "cross operation" on the equipment before the opening of the market every day. Pay special attention to the correction of equipment belts and the cleaning of measuring pressure sensors.
When pouring large volume concrete components that require continuous pouring. To carry out special process control on the equipment and develop appropriate emergency measures for the equipment,
(1) Key maintenance should be carried out on parts that are prone to malfunctions, and appropriate spare parts should be ensured in stock;
(2) Request the power supply department to provide reliable power guarantees;
(3) Maintain the standby generator in good technical condition;
(4) Maintain and prepare sufficient concrete transport vehicles (with a slight surplus). Equipment readiness information can only be reported to the dispatch when the equipment is ready.
The mixing plant should be equipped with two hydraulic pipes to facilitate the use of other power sources to unload concrete from the tank in case of a malfunction of the concrete transport vehicle. Adequate backup air picks should be used to promptly remove the solidified concrete in the concrete mixing and transportation truck tank. During equipment maintenance, adjustment, upkeep, and cleaning, the main power switch must be turned off and a warning sign reading 'During maintenance, do not close' must be hung.
There are many electrical control equipment and high technical content in the concrete mixing plant, and experienced electricians should be equipped to be responsible for the daily maintenance of electrical equipment.
Selection: Currently, there are over a hundred domestic manufacturers of concrete mixing equipment, with diverse varieties and a certain production scale. A number of well-known domestic brands have emerged, and some of their technical performance has reached or approached the level of foreign brands. In addition, there are numerous agents who act as agents to sell products from foreign companies. How to choose according to one's own situation when facing so many products? It is recommended to follow the following principles.
1、 Selection principle
(1) Production scale
Determine the production capacity of concrete mixing equipment based on the size of the production scale. The annual output is below 200000 m3, and the productivity of concrete mixing equipment is generally not less than 90m3/h; The annual output is 200000 to 300000 cubic meters, and the productivity of concrete mixing equipment is generally 120m3/h; The annual output is over 300000 m3, and the productivity of concrete mixing equipment is generally 150 m3/h or 200m3/h.
(2) Construction site
According to the size of the construction site, a concrete mixing plant or a concrete mixing station can be selected. Choosing a concrete mixing plant, the aggregate can be increased in one go, and the productivity of a mixer with the same capacity is higher than that of a mixing plant. The overall shape is neat and beautiful, the material yard occupies a small area, and the production environment is good. However, the manufacturing and installation cycle is long, and the one-time investment cost is high. Choosing a concrete mixing plant, the aggregate needs to be lifted twice, the layout is flexible, the manufacturing and installation cycle is short, and the one-time investment cost is low. However, the material yard occupies a large area and the production environment is poor.
(3) Equipment allocation
Select the specifications and working dimensions of the concrete mixer based on the equipment configuration. The loading capacity of the mixer truck should match the discharge capacity of the mixer, as improper matching can affect work efficiency. The loading capacity of the loader should match the loading height of the concrete mixing plant batching plant.
(4) Management function
If intensive network management is adopted, the network management function of concrete mixing equipment should be considered to avoid difficulties in future upgrades.
(5) Technical performance of equipment
Mainly considering the performance, reliability, excellence, and universality of the equipment. The equipment should have the characteristics of working principle, high degree of automation, management function, and good environmental performance. The equipment should have excellent configuration, reliable control methods, strong applicability, and good maintainability. In addition, high measurement accuracy, good mixing quality, high production efficiency, low energy consumption, large use of standard parts, and good interchangeability should also be considered.
(6) Supplier reputation
Mainly including whether the installation and debugging are strict; Whether technical guidance and training are in place; Whether the after-sales service is timely; Is the supply of spare parts sufficient.
(7) Performance price ratio
It is unwise to pursue the technical performance of equipment comprehensively, as it will increase unnecessary investment. However, only pursuing low investment and reducing the technical performance of equipment will lead to an increase in usage costs, which is also not advisable. The comprehensive performance of imported equipment in the domestic market is relatively high, but the price is also relatively expensive. Several well-known domestic brands in domestic equipment, although their comprehensive performance cannot be compared with imported equipment, commonly use imported components for key parts, and their main working performance is not much worse than imported equipment, but their prices are much lower. A more reasonable approach is to choose an appropriate performance price ratio.
Key component: mixer of commodity concrete mixing equipment
Forced concrete mixer has good mixing quality, strong overload capacity, no segregation during discharge, high production efficiency, and can adapt to concrete mixing of various properties. Forced concrete mixer is widely used in commercial concrete mixing equipment. But its structure is more complex and the cost of use is higher. The forced mixer is divided into several forms: double horizontal shaft, single horizontal shaft, single vertical shaft, and planetary type. The double horizontal shaft mixer is very suitable for the production of commercial concrete due to its good mixing performance, high production efficiency, good adaptability, outstanding structural characteristics, and good reliability; Due to their structural characteristics and adaptability, single horizontal shaft mixers and single vertical shaft mixers are becoming less and less commonly used in commercial concrete mixing equipment. Planetary mixers are also not widely used and are more commonly found in imported equipment.
Electric Control System of Commercial Concrete Mixing Equipment
There are various forms of electrical control systems for domestic concrete mixing plants, mainly consisting of the following three control methods.
(1) Distributed microcomputer control: This control form was widely used in the early design of mixing plants. The core of the control system is the programmable controller, and the higher-level computer is only used for managing report printing. The functions and roles of the computer are not very clear. With the widespread application of commercial concrete, the functional requirements for concrete mixing plants are becoming increasingly complex, and the application of this control form is very difficult.
② Centralized microcomputer control: This control form concentrates computer control and management functions on one computer, with heavy tasks, and the statistical analysis of report data cannot be synchronized during the production process. Data cannot be collected at any time, and measurement is greatly affected by human factors. For example, the development of measurement control programs, the accuracy of signal amplifiers and A/D boards, all affect measurement accuracy.
⑧ Centralized dual microcomputer control: This form solves the interference of human factors in metrology. The ingredient control instrument is adopted, and the production control and management functions are separated into two computers, which do not interfere with each other. The production control and report statistics are synchronized, and the management computer can also serve as a production backup machine, providing a network interface with the higher-level computer.
Other devices: Aggregate batching system:
Due to the influence of auxiliary equipment and site, the capacity of the silo should be selected to be larger.
For a mixing plant, the volume of a single silo is generally greater than 20m3. If a belt conveyor is used for feeding or a concrete silo is used, it can be even larger to reduce the footprint of the stacking yard. For mixing plants, the volume of a single silo is generally greater than 50m3. Concrete mixing plants are usually batching plants, which have two structural forms. The all steel structure batching plant uses above ground batching, which is easy to maintain and drain, but difficult to load, and often uses loaders or belt conveyors for loading; The material bin of the steel-concrete structure batching station is a concrete structure, with a ground warehouse for batching. It is convenient to load and easy to insulate, but difficult to maintain. Therefore, loaders, bulldozers, or dump trucks can be used for direct loading.
Aggregate lifting system:
Generally, belt conveyors and hoppers are used for lifting. Belt conveyors have high production efficiency, reliable performance, are easy to seal, are not easily affected by climate, have low maintenance costs, but occupy a large area. The lifting hopper is generally only used in mixing plants, with a compact structure and small footprint, but high maintenance costs and poor reliability. It is rarely used in large concrete mixing plants. There are also conveyors that use patterned belts and grooved belts, which can greatly increase the lifting angle. The grooved belt can be vertically lifted, but due to its reliability and difficult to solve the problem of material return, it is generally not widely used.
Mixing main building:
Generally, it is fully enclosed and equipped with a centralized dust removal device. In cold regions, winter construction cold protection requirements should also be considered, and insulation and exterior decoration should be done. Open type mixing plants and simple mixing plants, due to poor environmental performance, are rarely seen in newly built commercial concrete mixing equipment, and their use has been prohibited in some areas.
Measurement system:
The weight measurement method is divided into two forms: cumulative measurement and independent measurement. The cumulative measurement structure is simple, easy to maintain, and has a low feeding height, but it cannot control the measurement accuracy separately. Independent measurement independently controls measurement accuracy, with a complex structure and increased feeding height, resulting in increased costs.
Powder storage and conveying device:
The number and size of powder storage tanks should be configured according to the needs, generally determined by the type of material and supply situation. Powder tanks should be equipped with a level controller. There are generally two types of powder conveying devices: pneumatic conveying has a simple structure and uniform feeding, but long-distance conveying makes it difficult to control the air pressure; Spiral conveying has a long conveying distance, is easy to arrange the overall structure, and works reliably. The vast majority of mixing plants or mixing buildings use spiral conveying.
Accessories: The selection of accessories often determines the reliability of concrete mixing equipment. Generally, well-known brands with high reliability should be selected for accessories, especially for the main accessories. For domestic equipment, imported components such as electronic components, sensors, cement disc valves, and even reducers and lubrication components for mixers are more reliable.
In short, when choosing a good set of commercial concrete mixing equipment, multiple factors need to be considered comprehensively.
Safety Operation Regulations for Concrete Mixing Plant
1. The installation of concrete mixing plants should be carried out by professional personnel according to the factory manual, and organized for commissioning under the supervision of technical personnel. Only after all technical performance indicators meet the requirements and pass the acceptance inspection, can they be put into use. [2]
2. The equipment such as air compressors, belt conveyors, and concrete mixers that are matched with the mixing plant shall comply with the provisions of Sections 3.5, 6.8, and 8.2 of this regulation.
3. The pre homework inspection items should meet the following requirements:
(1) There are no foreign objects stuck in the transmission, moving parts, compartment doors, bucket doors, tracks, etc. of the mixing drum and various supporting mechanisms;
(2) The oil level height of each lubricating oil tank meets the regulations;
(3) Open the valve to discharge excessive water from the gas water separator in the gas path system, and open the drain plug of the gas storage cylinder to release the oil-water mixture;
(4) The installation of steel wire ropes and winding of drums for lifting buckets or shovels are correct, the steel wire ropes and pulleys comply with regulations, and the brakes for lifting buckets and shovels are sensitive and effective;
(5) All bolts have been tightened, and there is no excessive wear on the inlet and outlet valves. The tension of each conveyor belt is appropriate and does not deviate;
(6) All control and display parts of the weighing device are working properly, and their accuracy meets the requirements;
(7) Each electrical device can effectively control the mechanical action, and there is no obvious damage to each contact point and the moving and stationary contacts.
4. Qualified sand and stone aggregates should be prepared according to the technical performance of the mixing plant, and those with particle sizes exceeding the permitted range shall not be used.
5. Each part of the unit should be gradually started. After starting, the operation of each component and the indication of each instrument should be normal, and the pressure of oil, gas, and water should meet the requirements before starting the operation.
6. During the homework process, personnel are strictly prohibited from entering the storage area and under the lifting bucket.
7. Before starting the mixing drum, cover the compartment lid. During mechanical operation, it is strictly prohibited to touch the hopper or mixing drum with hands or feet.
8. When the shovel is stuck by an obstacle, it must not be forcibly lifted or used to lift heavy objects. During the material pulling process, no turning operation is allowed.
9. When the mixer is fully loaded for mixing, it must not be stopped. In the event of a malfunction or power outage, the power should be immediately cut off, the switch box should be locked, the concrete inside the mixing drum should be cleaned, and then the malfunction should be eliminated or the power should be restored.
10. All machinery in the mixing plant shall not be overloaded for operation; The operation of the motor should be checked. If abnormal sound or high temperature rise is found, the machine should be stopped immediately for inspection; Do not force operation when the voltage is too low.
11. Before stopping the mixer, it should be unloaded first, and then the switches and pipelines of each part should be turned off in order. All cement inside the spiral tube should be transported out, and there should be no residual material inside the tube.
12. After homework, the mixing drum, discharge door, and discharge hopper should be cleaned and rinsed with water, while also rinsing the additive and its supply system. The knife holder and blade of the weighing system should be cleaned thoroughly and the weighing accuracy should be ensured.
13. During the freezing season, the water pump, additive pump, water tank, and additive tank should be drained of stored water, and the water pump and additive pump should be started and operated for 1-2 minutes
14. When the mixing plant is transferred or stopped, the materials in the water tank, additive tank, cement, sand, stone storage hopper, and weighing hopper should be drained and cleaned thoroughly. During the transfer, the balance weight of the bar scale head should be fixed, and the sensor should be unloaded.
Sewage transformation and treatment system
During the concrete production process, a large amount of wastewater is generated during equipment cleaning and vehicle cleaning. It is a great waste of resources, and direct emissions can also cause significant harm to the environment. So the sewage treatment system in concrete production achieves 100% recovery of its wastewater, meeting the sewage * standard.
The sewage treatment renovation system mainly includes concrete transport vehicle unloading chute, sand and gravel separator equipment, sewage sedimentation tank, sewage tank mixer, clarification tank, conveying water pump, filter press, etc.
The conventional system has a total of four sewage tanks and three clarification tanks. Four sewage tanks are equipped with surface guardrails and mixers. And the 1st, 2nd, and 3rd sewage tanks are equipped with mud type water pumps, and the 2nd and 4th tanks are designed with level gauges; You have one sewage type water pump for each of the three clarification tanks. The agitator in the pool moves uniformly in a periodic manner to ensure the uniformity of water quality in the pool.
The various water tanks in the sewage treatment system need to be arranged in a certain order, with overflow pipes connected to each other at the bottom of the tanks and water pumps connected to each other at the top. When the water level in the pool is insufficient, a water pump can be used to supply water and maintain a stable water flow. If there is a large amount of water in the pool, it will flow back through the overflow pipeline provided in the pool, and the water quality will be clarified during the reflux process.
In the concrete mixing plant, there is a designed water channel connected to the sewage tank to collect rainwater and ensure cleanliness while reducing operating costs. The main station and vehicle cleaning system are equipped with water channels to divert production wastewater to the sewage tank for unified treatment.
Through the guidance and renovation of the entire drainage system in the concrete mixing plant, it has been achieved that the sewage in the mixing plant does not flow out, and the treated sewage is directly supplied to the mixing plant for use and vehicle cleaning after inspection. The generated waste residue can also be used as added aggregates. Realize the treatment of sewage *.

Xian County Longhui Highway and Railway Test Instrument Factory - After sales Service Objective:

Provide users with continuous, efficient, and fast services, and build a high-quality service brand;
Establish a service network that provides users with specialized, standardized, diversified, and productized services;
● User centered, with user satisfaction as the standard for measuring all work;

After sales service tenet:

● Provide lifelong repair and maintenance services, and be responsible for timely supply of spare parts for life;

Provide technical consultation and services;

New products are provided with free warranty for the entire machine according to the purchase and sales contract;

During the warranty period, no on-site fees, handling fees, labor costs, etc. will be charged, and all damaged parts under normal use will be replaced free of charge;

Outside the warranty period, no on-site fees, handling fees, labor fees, etc. will be charged, only the cost of replacement parts will be charged;

Longhui has an after-sales service guarantee system that covers the after-sales service network of various cities, counties, and districts in China. In case of any quality problems during product use, Longhui after-sales service only needs to be provided, followed by fault confirmation, technical guidance, on-site maintenance, and regular follow-up. Longhui's after-sales service system is completed.

Longhui Company mainly produces and supplies:Commercial concrete mixing plant laboratory instruments and equipment, concrete mixing plant testing instruments, highway testing instrument series, commercial concrete mixing plant laboratory instruments and equipmentCommercial concrete mixing plant laboratory instruments and equipmentAsphalt mixing plant testing equipment, concrete drilling and coring machine series, fully automatic curing room equipment series, constant temperature and humidity standard curing box series, cement concrete pressure testing machine series, universal material testing machine series, concrete single axis mixer series, cement electric bending test machine series, electric hot air drying box series, concrete freeze-thaw testing machine series, cement testing and inspection equipment, concrete testing and inspection equipment, asphalt testing and inspection equipment, highway testing and inspection equipment, geotechnical testing and inspection equipment, mortar testing and inspection equipment, non-destructive testing equipment. We can set up complete sets of instruments and equipment for first, second, and third level laboratories for our clients and friends (commercial concrete mixing plant instruments and equipment). Our products (except for vulnerable parts) are covered by a one-year warranty. If there are any quality problems within six months (except for user operated reasons), they will be replaced and repaired for life.

Longhui Company specializes in contracting:

A. Design and equipment configuration business for laboratories A, B, and C.

B. Design and equipment configuration business for P1, P2, and P3 level laboratories.

The integrity, strength, and product quality of Xian County Longhui Highway and Railway Test Instrument Factory have been recognized by the industry. Welcome friends from all walks of life to visit, guide and negotiate business. We will be dedicated to serving you.