Variable pressure difference load sensitive multiple-way valve

Abstract

The invention discloses a variable pressure difference load sensitive multiple-way valve. According to the variable pressure difference load sensitive multiple-way valve disclosed by the invention, each linked valve group adopts a novel element electro hydraulic pressure compensation valve, so that compensation pressure difference real-time continuous control and compensation valve core real-timeposition feedback monitoring are realized, and the problems that under the flow rate saturated working condition, a conventional LS system flow rate is mismatched, the diversion ratio of an LUDV system is fixed, and the motor coordination performance of an executor is poor are solved. The variable pressure difference load sensitive multiple-way valve disclosed by the invention has the advantages of being high in working condition applicability, high in flow distribution precision, high in technical performance 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...

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

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