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A variable pressure differential load sensitive multi-way valve

A load-sensitive, multi-way valve technology, applied in the hydraulic field, can solve the problems of unfavorable intelligent development of load-sensitive multi-way valves, valve port flow gain, low shunt accuracy, etc., to achieve fast response and efficient work, increase valve size Port flow gain, overcoming the effect of fixed diversion ratio

Active Publication Date: 2020-01-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing load-sensing technology pressure compensation valve relies on load pressure and oil source pressure control, and the compensation valve core is uncontrollable and unpredictable during the working process, which is not conducive to the intelligent development of load-sensing multi-way valves.
And, if figure 1 As shown, the compensation pressure difference Δp of the traditional compensation valve is constant and cannot match the system working conditions in real time. For precise positioning and inching operation conditions, an excessively large compensation pressure difference Δp will cause a large valve port flow gain and throttling loss , which increases the difficulty of system control; for the fast-changing conditions of large loads, too small compensation pressure difference Δp will cause the actuator to respond too slowly and reduce the working efficiency of the system
Furthermore, under the condition of flow saturation, the traditional load sensing (LS) technology has the problem of system flow mismatch caused by the failure of the pressure compensation valve; the operating speed of each actuator in the load independent distribution (LUDV) technology will be reduced in the same proportion, and the split ratio Fixed, low shunt accuracy, and poor coordination of actuators

Method used

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  • A variable pressure differential load sensitive multi-way valve
  • A variable pressure differential load sensitive multi-way valve
  • A variable pressure differential load sensitive multi-way valve

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Effect test

Embodiment 1

[0034] A variable pressure differential load sensitive multi-way valve, including at least one valve group, wherein each valve group includes an oil inlet circuit 1, a pilot control oil inlet circuit 2, a pilot control return oil circuit 3, a load sensing oil circuit 4, a return circuit Oil circuit 5, reversing valve 6, one-way valve 7, shuttle valve 8, first one-way relief valve 9, second one-way relief valve 10, characterized in that it also includes an electro-hydraulic pressure compensation valve 11 and a first Ⅰ Pilot pressure reducing valve 12;

[0035] like figure 2 As shown, the electro-hydraulic pressure compensation valve 11 is arranged before the reversing valve 6, the oil inlet A of the electro-hydraulic pressure compensation valve 11 communicates with the oil inlet 1, and the oil outlet B of the electro-hydraulic pressure compensation valve 11 communicates with the check valve The oil inlet of 7, the second control chamber P of the electro-hydraulic pressure com...

Embodiment 2

[0048] like Image 6 As shown, the second embodiment of a variable pressure differential load sensitive multi-way valve of the present invention is the same as the embodiment 1 in terms of structure and composition, the difference is that the connection mode between the electro-hydraulic pressure compensation valve 11 and the system is changed, and The reversing valve 6 is an electro-hydraulic proportional reversing valve.

[0049] The electro-hydraulic pressure compensation valve 11 is arranged after the reversing valve 6. The oil outlet of the check valve 7 is connected with the oil inlet A of the electro-hydraulic pressure compensation valve 11 and the second control chamber P of the electro-hydraulic pressure compensation valve 11. E Connected, the first control chamber P of the electro-hydraulic pressure compensation valve 11 F Connected with the load sensing oil circuit 4, the third control chamber P of the electro-hydraulic pressure compensation valve 11 G It communic...

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Abstract

The invention discloses a load-sensitive multi-way valve with variable pressure difference. Each valve group adopts a new-type electro-hydraulic pressure compensation valve, which realizes real-time continuous regulation of compensation pressure difference and real-time feedback monitoring of compensation valve core position, and overcomes the problem of flow saturation. In this case, the flow mismatch of the traditional LS system, the fixed shunt ratio of the LUDV system, and the poor coordination of the actuator movement. The variable pressure differential load sensitive multi-way valve disclosed by the invention has the advantages of strong working condition applicability, high flow distribution accuracy, strong technicality and the like.

Description

technical field [0001] The invention belongs to the technical field of hydraulic pressure and relates to a load sensitive multi-way valve, in particular to a load sensitive multi-way valve with variable compensation pressure difference. Background technique [0002] As the core component of construction machinery, multi-way reversing valves are mainly used in three control modes: positive flow, negative flow and load sensitivity. Positive and negative flow control technology is currently the mainstream technology adopted by domestic excavators. It adopts open center multi-way valve, which has a large center and bypass throttling loss, and does not use differential pressure compensation technology, which is affected by load pressure and oil source. Due to the influence of pressure changes, when multiple actuators act in combination, there is a problem of poor controllability. The load sensing technology adds a pressure compensating valve before the reversing valve of each ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02
CPCF15B13/02F15B2013/002F15B13/0416F15B13/0417F15B2013/0409F15B13/0433F15B2211/30535F15B2211/40561F15B2211/428F15B2211/426F15B2211/40569F15B2211/30555F15B2211/50518F15B2211/5159F15B2211/634G05D16/028F16K31/426
Inventor 权龙王波郝云晓王鹤李泽鹏夏连鹏
Owner TAIYUAN UNIV OF TECH