Because of the different construction conditions, what we need in the process of using concrete from time to time to adjust the pumping capacity, so that to meet the construction requirements of different working conditions, but many people are often not construction adjustment pump displacement or adjustment error problem, so how to adjust the volume of concrete pumping correctly is of great significance in the actual operation process, generally speaking, we can through the following several ways to adjust pump displacement:

1, adjust the engine speed

Can be change by changing the rotating speed of engine main pump displacement, and then change the pumping speed of change, realize the control of pump displacement. But this defect is that, when the engine speed changes, the rate of movement of the placing boom also changed, in the construction has the potential to be irreconcilable conflict.

2, mechanical adjustment

Can be manually adjusted through the throttle valve opening to change the size of the pump displacement. The advantage of this method in fast and convenient, cost is low. But its drawback is that manual adjustment must be done in the car, away from the pump truck to use the remote control operation, and its accuracy is low.

Three, electric proportional valve adjustment

1, wireless remote control output PWM signals directly drive displacement control proportional valve

Through wireless remote control output of 200-600 ma PWM signal directly proportional valve to drive the displacement control, realizes the pumping capacity stepless speed regulation, overcome the problem of mechanical adjusting method cannot realize remote control, but once a shortcoming of this method in the malfunction of the remote control in the control panel can’t realize the pump displacement.

2, proportion amplifier drive displacement control proportional valve plate output PWM signals

By (remote/control panel) switch wireless remote controller or control panel to quickly and easily proportional amplifier board at the input adjustment, make the proportion amplifier board output of 200-600 ma PWM signals to drive the displacement control proportional valve.

To sum up, the proportional amplifier output PWM signals to drive the displacement control proportional valve to change the way that the pump displacement, overcomes the drawback of mechanical inconvenient adjustment, and the flexibility to achieve the transformation between the wireless remote control and control panel control, realize the pumping capacity of stepless speed regulation, more in line with the requirements of actual construction.