Pressure maintaining and speed stabilizing hydraulic system of hydraulic machine

Abstract

The invention provides a pressure maintaining and speed stabilizing hydraulic system of a hydraulic machine. The pressure maintaining and speed stabilizing hydraulic system comprises an oil tank, a filter, a hydraulic pump, a motor, a one-way valve, a pilot operated compound relief valve, a two-position two-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a double-hydraulic-control one-way valve and a one-way speed regulating valve. When the hydraulic machine works in the feeding working station, the left position of the three-position four-way electromagnetic directional valve is connected; oil liquid enters a first hydraulic cylinder rodless cavity through the one-way valve, the three-position four-way electromagnetic directional valve and the left one-way valve in the double-hydraulic-control one-way valve under the effect of the hydraulic pump; oil liquid in a rod cavity enters a second hydraulic cylinder rodless cavity through a pipe and returns to the oil tank through a speed regulating valve body in the one-way speed regulating valve, and a valve opening of the speed regulating valve body is set to be capable of achieving the stability of the motion speed of the hydraulic machine during feeding. The hydraulic system of the hydraulic machine has the advantages of being remarkable in pressure maintaining effect in the feeding working condition, stable in running speed, rapid in returning and high in efficiency.

Description

technical field [0001] The invention relates to a pressure-maintaining and speed-maintaining hydraulic system of a hydraulic press, which belongs to the technical field of mechanical production control. Background technique [0002] With the continuous development of modern industrial control technology, the hydraulic control system technology of hydraulic presses is becoming more and more mature, and the requirements for its control performance are also getting higher and higher. During the working process of the hydraulic press, its working cycle has three stages: rapid descent, slow pressurization, and rapid return. Among them, the slow pressurization, that is, the working stage, is the focus of the entire hydraulic control process. At this stage, the tool (that is, the upper template) is required to keep the speed of movement stable while pressing the plate with a certain pressure. After the plate is pressed at a constant pressure and constant speed, the tool returns t...

AI Technical Summary

Problems solved by technology

If the pressure fluctuates or the speed of movement changes during the process of pressing the plate by the hydraulic press, it will cause shock, vibration, noise of the hydraulic system and even cause deformation and destruction of the plate material.

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