Bothway multiple-joint oil cylinder protection energy-saving hydraulic system

Abstract

The invention relates to a bothway multiple-joint oil cylinder protection energy-saving hydraulic system. The system comprises a pressure relay, a hydraulic control one-way valve and an overflow valve, wherein the pressure relay is arranged on a side connection oil way on an oil way of an electromagnetic directional valve and an oil cylinder rodless cavity; the hydraulic control one-way valve is arranged on the other side connection oil way on the oil way of the electromagnetic directional valve and the oil cylinder rodless cavity; and the overflow valve is connected to an oil way of the electromagnetic directional valve and an oil cylinder rod cavity in a bypass manner. By means of the system, long-term safe and efficient work can be guaranteed; and meanwhile the power losses can be reduced, and the effects of energy saving and protection are achieved.

Description

technical field [0001] The invention relates to the field of hydraulic systems, in particular to a bidirectional multi-section oil cylinder protection and energy-saving hydraulic system and an electrohydraulic jack using the hydraulic system. Background technique [0002] When the hydraulic system is working, two energy conversions are required, that is, the electrical energy is converted into hydraulic energy by the motor and the pump, and then the hydraulic energy is converted into mechanical energy through the hydraulic actuator, and the mechanical energy is used to do work. During this process, the energy loss is large, so the efficiency lower. The energy loss of the hydraulic system is released in the form of heat energy in the hydraulic system. At present, most designers tend to focus on the system's function, reliability and other indicators, and do not consider enough energy consumption. All kinds of unnecessary losses cause the system to heat up. In order to mainta...

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Problems solved by technology

[0003] At the same time, when the hydraulic system is finished and the oil cylinder is descending, because the effective working area of ​​the two chambers of the descending pressure cylinder is very different, when the piston is retracted, the oil discharge flow of the rodless chamber of the hydraulic cylinder is relatively large, and this When the diameter of the reversing valve is small, it will generate pressure, limit the retraction speed of the piston, and cause the reversing valve to heat up; and if the oil cylinder is lowered, forget to turn off the power, and the oil pump continues to work, which will cause damage to the equipment.

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