Plate stretcher stretching cylinder synchronous energy-saving hydraulic complex control system

Abstract

The invention discloses a plate stretcher stretching cylinder synchronous energy-saving hydraulic complex control system. The system comprises a first large flow electro-hydraulic directional valve, a second large flow electro-hydraulic directional valve, a first small flow high-frequency response proportional valve, a second small flow high-frequency response proportional valve, a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve, a fifth one-way valve, a sixth one-way valve, a seventh one-way valve, a first proportional variable displacement pump, a second proportional variable displacement pump, a constant pressure variable displacement pump, a first electromagnetic overflow valve, a second electromagnetic overflow valve and a third electromagnetic overflow valve. According to the system, preliminary synchronization of main oil ways of two stretching cylinders provided with displacement sensors is achieved through the proportional variable displacement pumps, and high-precision synchronization is fast achieved through the high-precision high-frequency response proportional valves. The plate stretcher stretching cylinder synchronous energy-saving hydraulic complex control system has the beneficial effects that the system is low in cost, high in efficiency and small in heating amount during high-speed stretching.

Description

technical field [0001] The invention belongs to the field of hydraulic control systems of plate stretching machines, and relates to a synchronous energy-saving hydraulic composite control system for stretching cylinders of plate stretching machines. Background technique [0002] At present, there are two forms of synchronous control of the two sets of stretching cylinders on the operating side and non-operating side of large-scale sheet metal stretching machines in China: one is the position closed-loop pump control synchronous hydraulic control system composed of servo pumps, displacement sensors and synchronous controllers. Features It has high efficiency and high precision, but high cost, poor dynamic response and high failure rate. For large plate stretching machines, the stretching speed range is large, and it is difficult to achieve high-precision synchronous control at low speeds; the second is to use large-diameter electro-hydraulic ratio The position closed-loop val...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a synchronous energy-saving hydraulic composite control system for the stretching cylinder of a plate stretching machine, which solves the problems of high cost and low efficiency of the current domestic large-scale plate stretching machine system, and the problem of large heat generation of the hydraulic system during high-speed stretching

Images