Load Sensing System Multifunctional Load Pressure Control Valve

Abstract

The invention discloses a multifunctional load pressure control valve of a load sensing hydraulic system. It includes oil inlet LS1, oil outlet LS2 and oil drain L; the oil inlet LS1 is connected with a filter; the other end of the filter is respectively connected with a one-way filter valve and a constant flow valve, and the one-way filter valve is another One end is connected to the oil outlet LS2, and the other end of the constant flow valve is connected to the oil inlet L; an electric proportional relief valve is connected in parallel at both ends of the constant flow valve. The invention has a simple and reliable structure, and is convenient for installation and maintenance; by installing the valve between the load sensing multi-way valve and the variable main pump, the safety reliability and response stability of the load sensing hydraulic system are improved, and the load sensing hydraulic system is broadened. The application range of the sensing system improves the security of the host.

Description

technical field [0001] The invention relates to a valve assembly for a hydraulic device, in particular to a multifunctional load pressure control valve for a load sensing hydraulic system. Background technique [0002] In the hydraulic system of modern engineering machinery, for the consideration of energy saving and consumption reduction, a large number of load sensing hydraulic systems are used, and the requirements for the safety, reliability and stability of the system response are getting higher and higher. The control of the load feedback pressure picked up by the load sensing multi-way valve is a key factor affecting the safety, reliability and stability of the system, and directly affects the performance of the whole machine. The existing load sensing system has the following problems: (1), there is no filtering device on the feedback pipeline between the load sensing multi-way valve and the variable main pump, and the possible residual pollutants (machined iron fili...

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Problems solved by technology

The existing load sensing system has the following problems: (1), there is no filtering device on the feedback pipeline between the load sensing multi-way valve and the variable main pump, and the possible residual pollutants (machined iron filings) inside the main oil circuit , particles, etc.) will often damage the servo variable mechanism of the variable variable main pump; (2), lacking the function of protecting the engine from no-load startup in the non-working state, and preventing the misoperation of the actuator caused by manual misoperation; ( 3) Although the load sensing multi-way valve can realize the unloading of the feedback pressure in the non-working state, it generally adopts the way that the feedback pressure port inside the valve body is directly connected to the main oil return port, and the unloading is too fast, which affects the variable main pump ramp The stability of the disk response will affect the stability of the system; (4), a pipe-type one-way throttle valve is installed between the load sensing multi-way valve and the variable main pump for filtering, the filtering effect is poor, and the response is easy to lag

This situation will cause the host to fail to work normally, and may cause a large security incident in severe cases

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