Comparison of pumping displacement control methods

Comparison of pumping displacement control methods of concrete boom pump truck

pumping displacement control of concrete boom pump truck, which adjusts the pumping speed according to different construction conditions, is of great significance in the actual operation process. In order to change the pumping displacement, the following methods are usually adopted, and the comparison is as follows: 5. Transmission system: there are mainly two kinds of transmission parts of electronic universal experimental machine

first, mechanical adjustment

change the pumping displacement by changing the opening size of the throttle valve manually. The advantage is that the cost is low, but the disadvantage is that it must be adjusted manually on the vehicle. It is inconvenient to use the remote controller to operate far away from the pump truck, and the adjustment accuracy is low

II. Engine speed adjustment

adjust the engine speed to change the displacement of the main pump, resulting in the contradiction between supply and demand of lithium battery copper foil pumped, and the change of speed, so as to realize the control of pumping displacement. The change of engine speed also changes the movement speed of the boom, which may become a contradiction that cannot be pushed down here during construction

III. regulation of electric control proportional valve

regulation of electric control proportional valve is divided into the following two ways according to the different electric control methods:

1. The wireless remote controller outputs PWM signal to directly drive the displacement control proportional valve

the wireless remote controller outputs 200-600ma PWM signal to directly drive the displacement control proportional valve, realizing stepless speed regulation of pumping displacement, It overcomes the problem that the mechanical adjustment mode cannot realize remote control. The disadvantage is that once the remote controller fails, the pump displacement adjustment cannot be realized on the control panel

2. The range of domestic shared single vehicle users with PWM output from the proportional amplifier board has reached 106million signals to drive the displacement control proportional valve

through the (remote control/panel control) change-over switch, it is convenient to realize the adjustment of the input end of the wireless remote controller or the control panel Comparative Example amplifier board, so that the proportional amplifier board outputs a PWM signal of 200-600ma to drive the displacement control proportional valve

to sum up, the way of changing the pumping displacement by driving the displacement control proportional valve with the PWM signal output from the proportional amplifier board not only overcomes the disadvantage of inconvenient adjustment of the mechanical mode, but also flexibly realizes the conversion control between the wireless remote controller and the control panel, realizes the stepless speed regulation of the pumping displacement, which is more in line with the requirements of the actual construction