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The key role and operational precautions of a 200 liter forced single horizontal axis concrete mixer
Date: 2025-09-16Read: 3
200 liter forced single horizontal shaft concrete mixerIt is a commonly used equipment for preparing concrete samples in small and medium-sized construction projects, prefabricated component factories, and laboratories. It can mix 0.2 cubic meters (about 500kg) of concrete at a time. The material is forcibly sheared and mixed by convection through spiral blades on a single horizontal shaft (speed 40-60rpm) to ensure uniform distribution of cement, sand, water, and additives (such as slump deviation ≤± 10mm). It is a key tool for controlling concrete quality.
1、 Key role:
In the laboratory, this equipment is used for standard concrete mix ratio testing (such as C20-C50 grades). By accurately controlling the mixing time (usually 3-5 minutes) and material ratio (such as water cement ratio 0.4-0.6), uniform test blocks (size 150 × 150 × 150mm) are prepared, providing reliable samples for performance testing such as compressive strength and impermeability; In the prefabricated component factory, it can continuously produce the concrete required for small prefabricated components such as curbstones and drainage ditch covers, ensuring stable mechanical properties of each batch of components; At the construction site, it is used for small-scale emergency mixing (such as repairing concrete defects) to avoid delays in the construction period due to purchased concrete. For example, a precast beam yard for a certain bridge precisely controls the mixing time and aggregate grading of C50 high-strength concrete through a 200 liter mixer, resulting in an average compressive strength of 58.6 MPa (design value of 50 MPa) for precast beams at 28 days.
2、 Precautions for operation:
1. Material placement sequence: Strictly follow the principle of "dry first, wet later" - first add cement, sand and gravel (total volume not exceeding 160 liters, leaving 20% space to prevent overflow), dry mix for 1-2 minutes to make the materials preliminarily mixed evenly, then add water and additives (such as water reducing agents that need to be dissolved in a small amount of water first), and continue mixing until the specified time. If the order is reversed (adding water first and then dry material), it will cause cement to clump and reduce uniformity.
2. Loading capacity control: The single mixing volume should not exceed 80% of the rated volume (i.e. about 160 liters). Overloading will cause an increase in blade mixing resistance (motor current exceeding 1.2 times the rated value is prone to tripping), and even material overflow from the feeding port; If the amount is too small, the mixing efficiency will decrease (the material cannot form effective convection).
3. Mixing time and speed: Adjust according to the concrete grade - ordinary C20 concrete should be mixed for 3-4 minutes, and high-strength C50 concrete should be extended to 4-5 minutes (to ensure sufficient hydration of cement); It is strictly prohibited to increase the speed arbitrarily (exceeding 60rpm may cause increased blade wear and may result in material being thrown out and injuring people).
4. Safety protection: Before operation, check whether the protective cover (covering the mixing shaft and feeding port) is firm. During operation, it is forbidden to insert hands or tools into the cylinder (high blade speed may cause mechanical injury); If there is abnormal noise (such as bearing damage) or motor overheating (temperature>80 ℃), the machine should be stopped immediately for inspection.
5. Cleaning and maintenance: After each use, clean the residual concrete inside the cylinder (especially the gap between the blades and the cylinder wall), use a shovel to remove large lumps, and then rinse with clean water; When not in use for a long time, drain the accumulated water in the cylinder (to prevent rust), and apply rust proof oil to the blades and bearings.
master200 liter forced single horizontal shaft concrete mixerThe key points of operation can not only improve the efficiency of concrete preparation (single batch time ≤ 8 minutes), but also ensure the quality of the project (test block strength deviation ≤± 5%), which is the basic guarantee for construction and laboratory research.