Slide valve type hydraulic valve with differential motion function

Abstract

The invention provides a slide value type hydraulic valve with a differential motion function. The slide value type hydraulic valve comprises a valve body and a valve element which is arranged in a valve body hole; a first undercutting groove, a second undercutting groove, an oil inlet undercutting groove, a third undercutting groove and a fourth undercutting groove are arranged in the valve body hole in sequence, wherein the first undercutting groove and the fourth undercutting groove are communicated with an oil return opening, the second undercutting groove and the third undercutting groove are communicated with a working oil port respectively, and an oil inlet undercutting groove is communicated with an oil inlet; the valve element comprises a left circular bead, a left shaft neck, a middle circular bead, a right shaft neck and a right circular bead from left to right; a circular groove, a first valve port and a second valve port are arranged on the excircle of the left part of the middle circular bead, wherein the first valve port and the second valve port are not communicated with each other; a third valve port and a fourth valve port which are communicated with the right shaft neck are arranged on the excircle of the right part of the middle circular bead and the excircle of the left part of the right circular bead respectively. The slide value type hydraulic valve realizes differential motion function through improving the structure of a main valve element of the hydraulic valve, the integral structure is changed little, so as to reduce the product cost and failure rate of the product; the differential motion function is realized, and stepless control of flow can be realized at the same time.

Description

technical field [0001] The invention relates to the technical field of hydraulic transmission and control, in particular to a slide valve hydraulic valve with a differential function. Background technique [0002] At present, there are mainly the following ways to realize the differential function of the oil cylinder: the differential function in the oil cylinder, the differential function in the control valve, the addition of a superimposed differential valve on the basis of the original control valve, and the hydraulic system through The pipeline is connected and combined with electrical control to realize the differential function. [0003] The above-mentioned ways to realize the differential function have their own disadvantages. For the existing control valves with differential functions, there are mainly the following disadvantages: [0004] 1. In order to realize the differential function, it is necessary to add logic valves, control valves and other components in th...

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Problems solved by technology

[0005] 2. In order to realize the differential function, the control valve needs to increase the control oil circuit and installation cavity accordingly, and the structure of the valve body is relatively complicated, which increases the product cost and product failure rate accordingly;

[0006] 3. This kind of control valve can only realize the on-off of the oil circuit, and cannot realize the stepless control of the flow rate

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