Flow compensation method and flow compensation device for proportional control pump

Abstract

The invention discloses a flow compensation method of a proportional control pump. When outlet pressure of the proportional control pump changes, by carrying out pressure compensation on the valve element end of a proportional control valve, compensation acting force generates a tilting tray angle increment value, and a proportional control pump output flow increment value generated by the tilting tray angle increment value compensates for a flow value lost due to the outlet pressure; a flow compensation device comprises an electric proportional control valve and a main pump provided with an oil absorbing opening and a working oil opening, the variable cylinder small end and the variable cylinder large end of the main pump are connected with the electric proportional control valve, and a pressure compensation valve is arranged at the tail end of the electric proportional control valve. By means of compensation, the influence on flow output by the main pump from pressure change is avoided, the load speed can be controlled stably, and accuracy is ensured.

Description

technical field [0001] The invention relates to the field of a proportional control pump, in particular to a flow compensation method and a flow compensation device of a proportional control pump. Background technique [0002] In hoisting and slewing machinery, in order to meet the accurate control of the output flow of the main pump by the main engine, especially to avoid abnormal movements caused by unstable flow when the main engine performs actions, it is extremely important to control the output flow stability of the main pump; the main pump is required to be The output flow at any displacement position in the proportional process is not disturbed by load pressure fluctuations, because the pump has certain volumetric efficiency loss and friction pair leakage loss under pressure, and when the load pressure is unstable, it also leads to volumetric efficiency loss and The leakage of the friction pair is unstable, which leads to the instability of the output flow. Due to t...

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Problems solved by technology

[0002] In hoisting and slewing machinery, in order to meet the accurate control of the output flow of the main pump by the main engine, especially to avoid abnormal movements caused by unstable flow when the main engine performs actions, it is extremely important to control the output flow stability of the main pump; the main pump is required to be The output flow at any displacement position in the proportional process is not disturbed by load pressure fluctuations. Because the pump has certain volumetric efficiency loss and friction pair leakage loss under pressure, and when the load pressure is unstable, it will also cause volumetric efficiency loss and The leakage of the friction pair is unstable, which leads to the instability of the output flow

Due to the unpredictability of the load pressure, the structural design of the general proportional control valve causes unpredictable changes in the output flow of the pump due to the unpredictability of the load pressure, resulting in the control accuracy of the proportional control pump not being able to play.

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