Due to the non-standard aggregate and unskilled operation at the beginning, pipe plugging is easy to occur. The standard pumped gravel is 1-3cm, and the sand should be medium sand. When pumping upward, try to reduce the elbow to reduce the pumping pressure. When pumping downward, try to reduce the vertical downward to avoid water loss and increase the possibility of pipe blockage. The operator should pay attention to the discharge of the mixer and adjust it in time to prevent over dry concrete.
Knock detection method:
During the working process, when the fine stone pump is blocked and the pipe is in normal operation and reverse operation, you can use a small hammer to knock on each part of the pipe and listen to its sound. If the sound is very heavy, you can judge the position of the blockage. Generally, it is easy to be blocked at the bend, the tail and end of the pipe, and the probability of blocking at the straight pipe is very small.
Reverse pump method:
In case of blockage during the operation of the transfer pump of the automatic feeding mixer truck, the mobile concrete mixer truck prompts that the transfer pump of the mixer truck can be reversed first. After three to four strokes, the blockage can usually be discharged by itself. If it still fails, the pipe can be removed and blocked. Firstly, the blocked position can be found and the pipe can be removed. It is worth noting that the pump can be reversed several times before pipe removal, so as to better prevent the pressure in the pipe from splashing during pipe removal, resulting in damage to personal safety