Electro-hydraulic control pressure machinery with hydraulic reversing function

Abstract

The invention discloses electrohydraulic control pressure machinery with a hydraulic changeover function and is applied to punching a workpiece. The machinery comprises an execution mechanism and a hydraulic control mechanism which provides pressure for the execution mechanism and controls the execution mechanism. The hydraulic control mechanism comprises a first hydraulic pipeline, a second hydraulic pipeline and a third hydraulic pipeline; a pressure-reducing valve; a first control unit; a supercharging mechanism; a second control unit; and a hydraulic buffer control mechanism. The supercharging mechanism of the hydraulic control mechanism cooperates with the hydraulic buffer control mechanism to enable pressure to be continuously increased when a punching rod goes into a third stroke segment to enable the workpiece to generate elastic-plastic deformation so that the requirement of the workpiece for gradually increasing the pressure during the elastic-plastic deformation is met, and through cooperative application of two non return valves in the first control unit, when the punching rod is fed to the third stroke segment from a second stroke segment, oil supply is automatically switched from the first hydraulic pipeline to the second hydraulic pipeline.

Description

technical field [0001] The invention relates to the technical field of electro-hydraulic control, in particular to an electro-hydraulic control pressure machine with hydraulic reversing function. Background technique [0002] In the prior art, two types of power are usually used for stamping workpieces. One is to use mechanical transmission as the power, that is, mechanical power; the other is to use hydraulic transmission as the power, that is, hydraulic power. Generally, when the deformation of the workpiece is reduced, the elastic-plastic modulus of the workpiece is small, and the pressure required for the deformation of the workpiece is small, it is more appropriate to use mechanical power, because the mechanical power makes the stamping action of the stamping rod faster. When the deformation of the workpiece is large, and the elastic-plastic modulus of the workpiece is large, and the pressure required for the deformation of the workpiece is large, it is more appropriate...

AI Technical Summary

Problems solved by technology

[0007] 1. The return stroke control of the stamping rod is complicated, and the return stroke response is not more sensitive

[0008] 2. When the stamping rod returns, the return speed is unstable, resulting in different return times each time

[0009] 3. The feed speed of the first stage and the second stage of the stamping rod is unstable, and the response to pressure changes is slow

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