Coal powder silo steel belt heavy hammer level gauge

1Coal powder silo steel belt heavy hammer level gaugeProduct advantages:

·Can effectively measure silos up to 42m in height

·Measurement is not affected by material properties such as humidity, conductivity, or material particle size

·Effective measurement can still be carried out at temperatures up to 150 ℃ during the process

·The interior of the silo and container has no impact on the measurement

·High measurement accuracy, with a deviation of only ± 1cm or ± 1 pulse from the current level

·Simple menu guided debugging and on-site operation through LED display screen

·Can operate normally in dust explosion hazardous areas, category 1/2D

·4-20 mA signal output and * 4 freely programmable relay outputs

·IP67 protection level under EN60529 standard

·Compact and exquisite design, small weight

·The specially developed belt cleaner ensures the cleanliness of the interior of the chassis

·Ensure that materials do not overflow from the silo port through electronic control of * minor fault * protection mode

IICoal powder silo steel belt heavy hammer level gaugeMeasurement principle:

The motor drives the steel strip to be lowered into the silo. When the hammer and material receive a rebound force, the hammer begins to retract. This is a measurement. The measurement can be set to automatic or manual mode.

The heavy hammer level gauge consists of a sensor and an instrument. The sensor adopts a heavy hammer detection type, and various signals are taken out by a specially designed acquisition unit. It has no mechanical contacts and operates reliably. The sensor is placed on the top of the warehouse, and the heavy hammer is pulled into the warehouse by a motor through a stainless steel belt or steel wire rope. The instrument controls the sensor to automatically detect the level of the material at regular intervals. During each measurement, the heavy hammer starts to descend from the starting position on the top of the warehouse and immediately returns to the top of the warehouse to wait for the next measurement when it touches the material surface. The instrument processes the sensor signal of the heavy hammer descent process to obtain the distance hl from the top of the warehouse to the material surface. The warehouse height H is pre-set by the user, so subtracting hl from the warehouse height H can obtain the material level height h=H-hl, and the instrument directly displays the material Position height h. The system adopts PLC control, which has strong functions, high stability, and easy operation; Specially suitable for level detection and control of powder, block, particle, and liquid materials in cylindrical silos in industries such as power, metallurgy, cement, coal, chemical, and food. Especially, this level indicator is equipped with communication function, which can not only be used independently, but also networked with the upper computer to form a distributed monitoring system. The upper computer can centrally manage the material level data sent by each site; Displaying and printing all the information of each silo, providing necessary information to the enterprise at any time, greatly improving the scientific management level and economic benefits of the enterprise's metrology. ”

IIICoal powder silo steel belt heavy hammer level gaugeApplication conditions:

Wood chip level detection, corn level detection, soybean level detection, coal powder level detection, etc

Model: LJ20

This product can measure feed, chemicals, plastic pellets, cement, stones, PVC powder, aggregates, liquids, coal, limestone, ground plastics, sand, powder, grains, oil, etc. Heavy hammer level gauges are commonly used in power plant ash silos, coal bunkers, slag silos, mud pits, etc. The advantages are mechanical measurement, simple and reliable, strong resistance to dust interference, and a range of up to 45.7 meters. The heavy hammer level gauge has multiple dust-proof designs and is not affected by the humidity and viscosity of the medium. The heavy hammer level gauge is not affected by the dielectric constant, conductivity, and thermal conductivity of the medium. The heavy hammer level gauge can also be used to measure special liquids such as mud, slurry, asphalt, etc.

Comparison between heavy hammer level gauge and other measuring devices: The heavy hammer level gauge is particularly suitable for level measurement in heavy dust environments, which can avoid the inability of ultrasonic level gauges to penetrate heavy dust and the important defect of dust accumulation at the antenna base of radar level gauges. It is very suitable for use in heavy dust measurement environments. The heavy hammer level gauge is widely used in harsh environments such as PVC powder silos, cement silos, and power plant ash silos, and has achieved success, receiving high praise from users.

4、 Installation:

Firstly, confirm that the instrument installation and wiring are correct, then connect the power supply. The power switch is located in the instrument drawer, pull out the drawer, turn on the power, and then close it. Under normal circumstances, the panel power indicator light is on, the number displays "0.00", and the ammeter indicates 4mA, indicating that the pointer is at 20%. At this point, the detection conditions are met:

Manual detection

Press the manual detection button to perform a detection: the process is as follows: the motor drives the heavy hammer to descend, and the number display gradually decreases from full range until the heavy hammer touches the material surface. The number no longer decreases, and at this point, the number is the height of the material surface in the silo. The heavy hammer automatically returns to the top of the warehouse. When the heavy hammer returns to the top of the warehouse. The current output value reflects the corresponding material level height.

There are many methods to prevent dust from entering the sensor at this material level, and different installation structures are adopted according to different application scenarios. If there are special requirements for ordering, they should be specified, such as material type, whether there is pressure, whether there is water vapor, etc. When applied to dusty environments, regular cleaning should be carried out according to the situation. On the side above the sensor flange, there is a small door tightened with screws, and tools such as brushes can be used to sweep out the dust inside. After a period of time, the interior of the machine should also be cleaned.

5、 Fault alarm description

Alarm 1: Heavy hammer not reaching the top

Generally, if there are iron beams, iron pipes or other conduit objects below the measuring port that hang or clamp the hammer, it should be inspected and processed. Or there may have been incidents where the hammer was buried due to excessive feeding, and detection was carried out after burial, causing the steel wire rope to deviate from its original position. At this point, the power should be turned off and not measurable! Wait until the fault is confirmed to be resolved before powering on, and the top switch will automatically connect to restore normal operation.

Alarm 2: Rise without pulse

Firstly, check if the reed switch is damaged or in the wrong position, if there are any broken or poorly connected wires between the primary and secondary meters, and if the top switch is in the wrong or damaged position. The heavy hammer is buried in the material and cannot be lifted. Is the motor damaged.

● Alarm 3: No pulse when lowering

Firstly, check if the reed switch is damaged or in the wrong position, and if there are any broken wires or poor contacts between the primary and secondary meters, or if the motor cannot rotate. Should go to the top of the warehouse for inspection and take corresponding measures.

● Alarm 4: The rise is not in place

First, check if the upper limit switch is functioning properly. The upper limit switch and the upper limit power-off switch should be connected first. The upper limit switch should be the first to be contacted. Only when the limit switch is damaged, will the power-off switch take effect. Adjust the limit switch to take effect first.