Pump-free energy accumulator closed oil way of hydraulic machine return and control method of pump-free energy accumulator closed oil way

Abstract

The invention relates to a pump-free energy accumulator closed oil way of hydraulic machine return and a control method of the pump-free energy accumulator closed oil way. An energy accumulator communicates with a return hydraulic cylinder through the closed oil way, and a space formed through communicating of the energy accumulator with the return hydraulic cylinder is arranged to be a closed space with certain pressure. Pressure oil in the return hydraulic cylinder communicates with the pump-free energy accumulator through an oil pipeline, the pressure of the pressure oil in the return hydraulic cylinder and the pressure of pressure oil in the pump-free energy accumulator are the same, and the return hydraulic cylinder always contains certain pressure oil and keeps certain pressure. Whenthe sum of the acting force of a main hydraulic cylinder and the weight of an acting part of work of a hydraulic machine is larger than the pressure of the return hydraulic cylinder, a walking beam works; and when the sum of the acting force of the main hydraulic cylinder and the weight of the acting part of work of the hydraulic machine is smaller than the pressure of the return hydraulic cylinder, the walking beam returns. Accordingly, the number of hydraulic machine pumps and configuration of hydraulic components are reduced to the maximum degree, the return pressure is stabilized, the pressure response speed is increased, and equipment configuration and energy loss are reduced to the maximum degree.

Description

technical field [0001] The invention relates to a closed oil circuit of a pumpless accumulator, in particular to a closed oil circuit in which a return cylinder of a hydraulic machine communicates with a pumpless accumulator, and also relates to a control method for the closed circuit. It belongs to the technical field of hydraulic transmission. Background technique [0002] The return stroke of the traditional hydraulic machine is realized by the pressure oil provided by the hydraulic pump to drive the return hydraulic cylinder to drive the movable beam to return. Since the return hydraulic cylinder requires not only high pressure but also a large flow during the return process, it is necessary to equip a sufficient number of hydraulic pump. When the hydraulic machine is working, the main hydraulic cylinder is first connected to the pressure oil, and the movable beam drives the working part to fast-forward to the working part, and the return oil in the return hydraulic cyl...

AI Technical Summary

Problems solved by technology

During the above-mentioned reciprocating process, the return hydraulic cylinder continuously enters and drains oil, which not only wastes a lot of energy, but also causes the pressure in the return hydraulic cylinder to be unstable and the response speed is slow

Not only that, the configuration of the return hydraulic cylinder and the hydraulic pump also needs to set up a complex control circuit, and the components in the control circuit are often damaged due to various factors such as wear and tear, resulting in great waste

Therefore, the setting and method of the return oil supply circuit of the traditional hydraulic press have disadvantages such as unreasonable resource allocation, complex components in the control circuit, unstable working pressure of the hydraulic cylinder, slow response speed, and large maintenance.

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