A loop to improve the response speed of the pump control cylinder system

Abstract

The invention belongs to the technical field of hydraulic drive, and relates to a loop capable of increasing the response speed of a pump controlled cylinder system. The loop comprises a prime motor,a main pump, an oil make-up pump, a first pilot control valve, a shuttle valve, a first reversing valve, a second reversing valve, an auxiliary cylinder, a working cylinder, an oil tank and a controller, and is characterized in that the first pilot control valve is a three-way valve, and an opening A, an opening B and an opening C of the first pilot control valve communicate with a lower control opening of the shuttle valve, an opening Pb of the main pump and an opening T of the second reversing valve correspondingly. The loop has the beneficial effects that when outer loads of a moving arm, abucket rod and a bucket change fast and repeatedly, the loop can avoid the inertia and friction force influence of a piston of the auxiliary cylinder and other motion components, the pressure response of an oil discharge way and an oil absorption way of the main pump is improved, and the response speed of the pump controlled system is improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission, and in particular relates to a circuit for improving the response speed of a pump control cylinder system. Background technique [0002] With the tremendous development of my country's construction machinery industry, it is of great significance to effectively reduce the energy consumption of excavators and loaders. The pump-controlled cylinder hydraulic system belongs to the volumetric speed regulation technology. Compared with the throttling speed regulation system, the pump-controlled cylinder hydraulic system has higher overall efficiency. In the invention patent with application number 201710568689.1, the technical solution of using the auxiliary cylinder to balance the asymmetric flow of the working cylinder is proposed, which has a good prospect in the fields of excavators and loaders. However, when the load force on the boom, arm or bucket changes repeatedly, due to the in...

AI Technical Summary

Problems solved by technology

However, when the load force on the boom, stick or bucket changes repeatedly, due to the influence of factors such as inertia and friction of moving parts such as the piston and piston rod of the auxiliary cylinder, the pressure on the oil suction side or oil discharge side of the main pump The response is not timely, and the spool of the shuttle valve is not reversing in time, which affects the response speed of the pump control cylinder system to the load change

In the patent US20140366519, it is proposed to detect the pressure of the inlet and outlet of the pump through the pressure sensor, the controller sends a command signal, and the electromagnet controls the transposition of the shuttle valve. This solution is relatively complicated.

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