Load sensing hydraulic system for controlling six-way multiple unit valve

Abstract

A load sensing hydraulic system used in six-way valve. Using displacement-controllable variable delivery pump and six-way valve, multiple hydraulic load can be controlled. The loade limit can be checked by pressure detector set on the oil mouth of six way valve. On the bypass loop of six-way valve, a flow detector is set between the six-way valve group and the hydraulic oil tank to detect the oil flow of the rear oil-return tank. Because of the flow detector, the loss of flow through the bypass loop can be greatly lowered, also because of the check of load pressure in the system, the output pressure of hydraulic pump can be controlled.

Description

technical field [0001] The invention relates to the control of a hydraulic pump, a pumping device or a system, and is a load sensing hydraulic system used for the control of a six-way multi-way valve. Background technique [0002] In most hydraulically driven mechanical equipment such as hydraulic excavators and cranes, the hydraulic circuit includes at least one hydraulic pump and a multi-way valve. Among them, the hydraulic pump provides the pressure oil to drive the mechanical equipment, and the multi-way valve is located between the hydraulic pump and the actuator to control the flow and direction of the hydraulic oil, thereby controlling the movement direction and speed of the actuator. [0003] According to whether the displacement of the hydraulic pump used in the hydraulic system is variable, the hydraulic system of this "pump-valve-actuator" mode can be divided into a quantitative system and a variable system. Whether it is a quantitative ...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the structure of multi-way valve and load sensing pump is complicated and the cost is high, which limits its popularization.

[0009] To sum up, in the existing energy-saving control methods of hydraulic systems, some have complex structures and high costs, such as load sensing control systems; some cannot effectively eliminate bypass throttling losses, such as constant power systems and flow demand Control system; although the negative flow control system can better eliminate the bypass oil return loss and can better control the working speed of the actuator, it lacks the pressure adaptation control function like the load sensing control

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