Efficient and high-precision hydraulic control system adopting combination of pump and valve

Abstract

The invention discloses an efficient and high-precision hydraulic control system adopting a combination of a pump and a valve. A servo motor is connected with the constant displacement pump through a coupler. An inlet of the constant displacement pump is connected with an oil tank through a second filter, and an outlet of the constant displacement pump is connected with the oil tank and connected with the inlet end of the check valve. The outlet end of the check valve communicates with a rodless cavity and a rod cavity of a single piston rod cylinder executor, communicates with an oil returning tank and is connected with an energy storage device. The energy storage device is connected with the rodless cavity of the single piston rod cylinder executor. A two-way proportion cartridge valve is connected between the rodless cavity and the oil tank, and another two-way proportion cartridge valve is connected between the rod cavity and the oil tank. Outlets of the energy storage device and the rodless cavity and the rod cavity of the single piston rod cylinder executor are all connected with pressure sensors. The efficient and high-precision hydraulic control system adopting the combination of the pump and the valve improves energy efficiency, high-precision movement error compensation of the executor is achieved through a feedback control mode, the cost is reduced, and meanwhile independent control over the pressure of two cavities of a loaded hydraulic cylinder and energy-saving control over the system are realized.

Description

technical field [0001] The invention relates to a hydraulic control system, in particular to a high-efficiency and high-precision hydraulic control system using a combination of pumps and valves in the field of hydraulic high-precision control. Background technique [0002] Traditional hydraulic high-precision control mainly adopts valve control mode, and the movement of the load is controlled through proportional valves and servo valves. The control valve adopts throttling control, and through the application of appropriate control methods, it can achieve high-precision motion control. However, the pressure drop caused by the hydraulic oil flowing through the valve port will cause energy loss, and at the same time cause the system to heat up. The more energy consumption and heat generation problems It has increasingly become a problem to be solved in the field of hydraulic control. In addition, when the traditional three-position four-way valve is used to control the hydra...

AI Technical Summary

Problems solved by technology

The control valve adopts throttling control, and through the application of appropriate control methods, it can achieve high-precision motion control. However, the pressure drop caused by the hydraulic oil flowing through the valve port will cause energy loss, and at the same time cause the system to heat up. The more energy consumption and heat generation problems It has increasingly become a problem to be solved in the field of hydraulic control

In addition, when the traditional three-position four-way valve is used to control the hydraulic cylinder, due to its internal mechanical coupling, it is impossible to complete the separate control of the pressure of the two chambers of the hydraulic cylinder, resulting in an increase in energy consumption

[0003] The pump control strategy using variable speed pumps or variable speed motors to drive quantitative pumps can reduce system energy consumption and improve energy efficiency. However, the pump control system has problems with poor dynamic response performance and poor control accuracy compared to valve control.

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