Improved servo control valve and its control method

Abstract

The invention relates to an improved servo control valve. The servo control valve comprises a valve body, wherein a valve sleeve and a valve core are arranged on the valve body, and the valve core and the valve sleeve are mounted and arranged in a misplacement manner; an inner hole of a valve seat is mounted on the valve core in a sleeving manner, and an excircle at the lower part is mounted in a mounting hole of the valve sleeve; a pull rod is mounted on the excircle of the valve core in a sleeving manner, a spacing pin is mounted in a positioning pin hole formed in the valve core in a transitional manner, one end of the spacing pin is sunk in the valve core, and the other end of the spacing pin is protruded outside the excircle of the valve core and is inserted in a spacing groove formed in the valve seat; an adjusting screw is combined with the valve body in a screwed manner, and the middle part of a feedback rod is mounted in the adjusting screw in a sleeving manner; a ball head at the left end of the feedback rod is fit with a radial hole formed in the valve sleeve, and a ball head at the right end is mounted in a feedback groove of a servo cylinder; a reset spring seat is mounted in the valve body; in addition, an oil path in the valve body is divided into three parts of oil feeding, oil controlling and oil returning, which are mutually communicated. According to the invention, the valve core is controlled to rotate in different directions, so that the purpose that the servo cylinder operates in different directions is realized, and swash plates oblique by corresponding angles; therefore, the purpose of oil pumping in dual directions is realized, and the output discharge capacity of a pump is changed.

Description

technical field [0001] The invention relates to the technical field of servo variable mechanisms, in particular to an improved servo control valve and a control method thereof. Background technique [0002] The servo control valve is the core control element of the servo system, and all other components are integrated on the valve body. The performance of the valve body directly affects the accuracy and stability of the entire control system. By installing the valve body on the pump body and controlling the pressure oil Control hydraulic pump displacement. The valve core and valve sleeve are set in the valve body to control the connection of the oil circuit, so as to control the operation and fixed stop of the oil cylinder by controlling the pressure oil to be sent to the variable oil cylinder through the servo control valve, and play the role of controlling the displacement of the hydraulic pump. There is no positioning device on the currently used spool, which causes the ...

AI Technical Summary

Problems solved by technology

There is no positioning device on the currently used spool, which causes the angle of the spool to be out of control during rotation, resulting in damage to some variable components, which in turn affects the displacement of the pump, causing the entire pump to be out of control, and the tie rod is installed on the spool On the outer circle, when the pull rod is pulled to drive the valve core to rotate under the action of the external control device, it is easy to cause relative sliding between the pull rod and the valve core, which indirectly affects the fixed-point stop position of the oil cylinder. After reset, the servo system cannot be in the zero position accurately; at the same time, the valve sleeve The control end of the spool setting is unreasonable, so that the hydraulic system cannot realize the servo cylinder running in different directions by manipulating the spool, and then drives the hydraulic pump swash plate to tilt in different directions to realize two-way pumping oil, and the pump output displacement cannot be changed in real time

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