Proportional reversing valve for eliminating hysteresis of main valve

A technology of proportional reversing valve and hysteresis, which is applied in the field of hysteresis elimination machine-hydraulic servo system, can solve problems such as hysteresis control accuracy, achieve good stability, good dynamic characteristics, and improve the effect of position control accuracy

Active Publication Date: 2021-12-21
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] The present invention provides a proportional reversing valve that eliminates the hysteresis of the main valve, the purpose of which is to eliminate the hysteresis caused by friction in the mechanical-hydraulic servo system, and solve the problems of hysteresis and low control accuracy caused by the friction between the valve core and the valve body. question

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  • Proportional reversing valve for eliminating hysteresis of main valve

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] see figure 1 , the present invention includes a main valve core 3, a ball screw 4, a servo motor 12, a right-position energized coil 6, a left-position energized coil 8, a left-position pilot oil chamber two-position two-way proportional reversing valve 9, a right-position pilot oil chamber Two-position two-way proportional reversing valve 2, left pilot oil chamber pressure sensor 14, right pilot oil chamber pressure sensor 20, oil inlet pressure sensor 5, main valve right spring 1, main valve left spring 10, pressure Compensator 17, left plug 15, right plug 18, reducer with two reduction ratios 11, left wire power supply 13, right wire power supply 21, pilot spool 7, valve body 16, main spool displacement sensor 15.

[0017] The main valve core 3 is provided with a through hole j on the end surface of the main valve core communicated with the pilot oil chambe...

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Abstract

The invention discloses a proportional reversing valve for eliminating hysteresis, and belongs to the field of machinery. The proportional reversing valve comprises a main valve core, a ball screw, a servo motor, an electrified coil, a pilot oil cavity two-position two-way proportional reversing valve, a pilot oil cavity pressure sensor, an oil inlet pressure sensor, a main valve spring, a pressure compensator and a plug. A pilot valve core is arranged in a large annular groove of the main valve core, the pilot oil cavity two-position two-way proportional reversing valve communicates with a main valve pilot oil cavity, the servo motor is directly connected with a speed reducer, the speed reducer is directly connected with the left side of the ball screw, the pilot oil cavity pressure sensor is installed in a main valve spring cavity, and a wire power source is fixed to a valve body. The electrified coil is led out from the wire power supply, penetrates through the wire hole of the main valve core and is wound in a middle groove of the main valve core. According to the proportional reversing valve for eliminating hysteresis, the problems of hysteresis, impact and low control precision generated in the movement process of the main valve core of the proportional reversing valve are solved.

Description

technical field [0001] The invention relates to a machine-hydraulic servo system for eliminating hysteresis. Background technique [0002] The flow distribution multi-way valve (LUDV system) which has nothing to do with the load pressure is used in the hydraulic system of small excavators, and the pressure compensation valve is placed after the main valve to compensate the system pressure after the valve. When multiple actuators work at the same time, the pressure of the actuator with the highest pressure compensates the pressure of the actuator with the lower pressure, so that the pressure difference of each actuator can be kept constant at any time, so the flow rate of multiple actuators can be controlled. proportional distribution. However, due to the friction between the main spool and the valve body, the main spool cannot reach the exact position, resulting in inaccurate control of the opening of the valve port. Contents of the invention [0003] The present inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K11/07F16K31/04F16K31/50F16K37/00E02F9/22
CPCF16K11/0708F16K11/0716F16K31/04F16K31/50F16K37/0083F16K37/0091E02F9/2267
Inventor 杨敬岳路宏权龙
Owner TAIYUAN UNIV OF TECH
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