Electro-hydraulic hybrid servo system

Abstract

The invention relates to an electro-hydraulic hybrid servo system. The electro-hydraulic hybrid servo system comprises a pusher oil cylinder unit executing specified actions, an electronic control unit used for detecting the actions and torque of the pusher oil cylinder unit in real time, and a hydraulic control unit used for controlling the oil pressure and oil circuit of the pusher oil cylinder unit. The servo system further comprises a controller used for acquiring detecting information of the electronic control unit and sending control instructions to the hydraulic control unit according to a preset program. By means of the electro-hydraulic hybrid servo system, the precision advantage of a servo motor and the high-load drive capability of a hydraulic system are combined; compared with a traditional electric servo pusher, larger drive capability can be achieved; and compared with a hydraulic servo system, low cost and maintenance cost are achieved.

Description

technical field [0001] The invention relates to the field of electro-hydraulic servo systems, in particular to a servo system jointly controlled by an electric mode and a hydraulic mode. Background technique [0002] At present, in hydraulic equipment, the use of hydraulic cylinders is the most common. Hydraulic cylinders are hydraulic actuators that convert hydraulic energy into mechanical energy and perform linear reciprocating motion (or swing motion). During use, if the stroke position of the piston can be accurately controlled in real time, it will have a certain expansion effect on the use function of the hydraulic cylinder. [0003] Therefore, it is necessary to provide a hydraulic cylinder that can accurately control the stroke position of the piston in real time and expand the function of the cylinder to overcome the above-mentioned technical defects. [0004] Chinese Patent Publication No.: 202985213U discloses a fast-feeding lead screw of an oil cylinder to solve...

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Problems solved by technology

[0004] Chinese Patent Publication No.: 202985213U discloses a fast-feeding lead screw of an oil cylinder to solve the problem of inaccurate positioning of the lead screw in the prior art after repeated actions; The lead screw is equipped with a lead screw feed limit travel switch, an oil pressure quick retreat limit travel switch corresponding to the lead screw feed limit and oil pressure quick retreat limit respectively, and the oil pressure quick return limit travel switch. , The screw back limit position is respectively equipped with an oil pressure fast delivery limit travel switch, and a screw back limit travel switch

[0005] In the above technical solution, the problem of inaccurate positioning of the lead screw is solved by detecting the stroke and position of the lead screw and the oil cylinder, and the feedback of the entire hydraulic circuit is still achieved by detecting the mechanical parameter information of the components on the oil circuit. The accuracy of this detection method is poor; the hybrid control of the electronic control method and the hydraulic control method has not been improved, and the control accuracy is only guaranteed by the accuracy of the detection

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