Electric hydraulic control pressure machine with pressure maintaining function and hydraulic reversing function

Abstract

The invention discloses an electric hydraulic control pressure machine with a pressure maintaining function and a hydraulic reversing function, and the electric hydraulic control pressure machine is used for punching a workpiece. The electric hydraulic control pressure machine comprises an executing mechanism and a hydraulic control mechanism for providing pressure for the executing mechanism and controlling the executing mechanism. The hydraulic control mechanism comprises a first hydraulic pipeline, a second hydraulic pipeline, a third hydraulic pipeline, a pressure reducing valve, a first control unit, a pressurizing mechanism, a second control unit, a hydraulic buffering control mechanism and a return trip pressure maintaining mechanism. The pressurizing mechanism and the hydraulic buffering control mechanism of the hydraulic control mechanism are matched so that when a punching rod enters a third stroke section and the workpiece elastically deforms, the pressure is constantly increased, and therefore the requirement for gradual pressure increasing is met when the workpiece elastically deforms. Through the return strip pressure maintaining mechanism, when returning, the punching rod cannot impact on an executing oil cylinder.

Description

technical field [0001] The invention relates to the electromechanical field, in particular to an electro-hydraulic control pressure machine with pressure maintaining function and 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 mor...

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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