Hydraulic control system and method as well as pump

Abstract

The invention relates to a hydraulic control system. The hydraulic control system comprises an oscillating oil cylinder, a first pressure oil source, a pumping main oil cylinder, an oscillating oil cylinder reversing valve set, a pumping system combination and a reversing buffering valve set, wherein the oscillating oil cylinder reversing valve set is used for reversing a piston of the oscillating oil cylinder; the pumping system combination is used for realizing reciprocating motion of the pumping main oil cylinder and providing a reversing signal for the oscillating oil cylinder reversing valve set; the reversing buffering valve set is used for reducing reversing impact of the pumping main oil cylinder. The invention further relates to a control method of the hydraulic control system and a pump containing the hydraulic control system. According to the hydraulic control system, when a pumping system is reversed, the displacement of the hydraulic pump does not need to be adjusted and part flow of the system is overflowed at the moment of reversing, so that the flow of the system is reduced, the movement speed of the pumping main oil cylinder is reduced and the system impact is reduced, and furthermore, the stable reversing of the pumping system is realized; the working efficiency of the system is improved and the fault rate is reduced.

Description

technical field [0001] The invention relates to the field of hydraulic control, in particular to a hydraulic control system, a control method and a pump. Background technique [0002] In a hydraulically driven double-piston pumping system, when the main cylinder reaches the reversing position for reversing, in order to reduce the impact on the cylinder caused by the rapid movement of the piston in the main cylinder, the related prior art usually uses a variable displacement pump as the Pressure oil source, when the main cylinder is about to reach the end position of the cylinder, the output flow of the variable pump is reduced to reduce the movement speed of the piston, so as to achieve the purpose of smooth reversing. [0003] However, the reversing frequency of the main cylinder in the pumping system is very fast. In order to reduce the reversing impact of the main cylinder, it is necessary to frequently adjust the output flow of the variable pump, thereby reducing the ser...

AI Technical Summary

Problems solved by technology

[0003] However, the reversing frequency of the main cylinder in the pumping system is very fast. In order to reduce the reversing impact of the main cylinder, it is necessary to frequently adjust the output flow of the variable pump, thereby reducing the service life of the variable pump and the working efficiency of the system.

In addition, electrical components such as proximity switches are used, and the failure rate is high

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