Electro-hydraulically controlled pressure machinery with hydraulic power provided by dual accumulators

Abstract

The invention discloses an electrohydraulic-control pressing machine with two energy accumulators for providing hydraulic power. A hydraulic control mechanism comprises the first energy accumulator, the second energy accumulator, a first hydraulic pipeline, a second hydraulic pipeline, a third hydraulic pipeline, a first control unit, a supercharging mechanism, a second control unit and a hydraulic buffering control mechanism. The supercharging mechanism and the hydraulic buffering control mechanism of the hydraulic control mechanism are matched, so that the pressure is increased continuously when a workpiece is subjected to elasticoplastic deformation in the third stroke stage of a punching rod, and accordingly the requirement for gradually-increasing pressure during elasticoplastic deformation of the workpiece is met. The pressure and power of the hydraulic control mechanism are provided by the two energy accumulator (the first energy accumulator and the second energy accumulator), the first energy accumulator and the second energy accumulator provide the pressure and feeding power required by the workpiece in the three stroke stages of the punching rod correspondingly, and the pressure provided by the energy accumulators is more stable than the pressure provided by an oil pump, so that the machined workpiece is good in performance stability and high in interchangeability.

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 dual accumulators providing hydraulic power. 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 m...

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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