Externally controlled two-position two-way pilot type proportional valve

A two-position, two-way, proportional valve technology, which is applied in the direction of fluid pressure actuators, servo motor components, mechanical equipment, etc., can solve the problems of poor low-pressure controllability and high-pressure stability, and achieve the goal of improving low-pressure controllability Effect

Active Publication Date: 2016-12-21
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of poor low-pressure controllability and high-pressure stability of the two-position two-way proportional valve in the existing hydraulic control system, the present invention proposes an externally controlled two-position two-way pilot proportional valve

Method used

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  • Externally controlled two-position two-way pilot type proportional valve
  • Externally controlled two-position two-way pilot type proportional valve
  • Externally controlled two-position two-way pilot type proportional valve

Examples

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Embodiment 1

[0017] Example 1: figure 1 As shown, an externally controlled two-position two-way pilot-operated proportional valve includes a main valve body 1, a main valve core 2, a positioning spring 3, a pilot proportional valve 4, and a proportional amplifier 5. It is characterized in that: the positioning spring 3 and The main valve core 2 is coaxially arranged in the main valve body 1, the main valve body 1, the main valve core 2 and the positioning spring 3 constitute the main valve; the main valve core 2 and the main valve body 1 form three oil ports communicating with the outside world, That is, the first working oil port A, the second working oil port B, and the control oil port Pc, the opening amount of the first working oil port A is proportional to the displacement of the main valve core 2, the first working oil port A, the second working oil port Port B is respectively connected to the oil inlet chamber and oil return chamber of the actuator to introduce constant pressure oil...

Embodiment 2

[0019] Example 2: figure 2 Among them, just as the structure and working principle of the externally controlled two-position two-way pilot proportional valve described in Embodiment 1, Embodiment 2 adds a pilot displacement sensor 7 and a pilot feedback signal amplifier 8 on the basis of Embodiment 1. , the first adder 9, closed-loop controller 10, electronic switch 11, the second adder 12, feed-forward controller 13; the output end of the pilot displacement sensor 7 is connected to the input end of the pilot feedback signal amplifier 8, the pilot feedback signal amplifier The output terminal of 8 is connected with the control terminal of electronic switch 11 and the input terminal of the first adder 9 respectively, setting signal u xs Be connected to the input end of the first adder 9 and feed-forward controller 13 simultaneously, the output end of the first adder 9 is connected to the input end of closed-loop controller 10; The output terminal is connected, the output ter...

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Abstract

The invention discloses an externally controlled two-position two-way pilot type proportional valve which is applicable to a hydraulic control system. The externally controlled two-position two-way pilot type proportional valve is characterized in that a main valve is provided with three oil ports; the displacement of a main valve core is controlled by pressure oil from the control oil port; when the flow of oil passing through an oil groove of the main valve core is consistent with the flow of oil passing through the pilot type proportional valve, the opening degree of one working oil port reaches a stable state; an electronic switch is arranged between an open loop controller and a feedback signal controller and is controlled by a pilot displacement sensor or a main valve displacement sensor; the control oil port is connected with a constant-pressure source; the dynamic characteristic of the main valve is not affected by the pressures of the working oil ports of the main valve; the low-pressure controllability, the high-pressure stability and the dynamic characteristic of the valve are improved; and oil is piloted back into an oil tank, so that the power of a pilot level is reduced. The externally controlled two-position two-way pilot type proportional valve is simple in structure, easy to popularize and apply, and applicable to the hydraulic control system.

Description

technical field [0001] The invention belongs to the technical field of electro-hydraulic control valves, in particular to an externally controlled two-position two-way pilot proportional valve for controlling actuators in a hydraulic system. Background technique [0002] The existing two-position two-way proportional valve mostly adopts internal control method, and the minimum working pressure of the valve is relatively high, which will cause unnecessary energy loss, and the low-pressure controllability of the valve is poor, and the high-pressure stability is low; the existing multi-way valve Pressure control is mostly used, there is no feedback, and the control accuracy is low. The spring needs to be accurately matched with the pressure, and the spring processing accuracy is high. In some applications, such as the independent control system of the load port, when the two-position two-way valve is connected to the oil return chamber of the hydraulic cylinder, the pressure in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02F15B15/16
CPCF15B13/02F15B15/16
Inventor 权龙郝云晓张晓刚黄家海程珩
Owner TAIYUAN UNIV OF TECH
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