Linear driving device based on electro-hydraulic composite driving

Abstract

The linear driving device comprises an energy recovery part, a mechanical transmission part, an electric power part and a hydraulic power part, the electric power part and the hydraulic power part are in transmission connection with the mechanical transmission part, and the energy recovery part is connected with the electric power part and the hydraulic power part. The mechanical transmission part comprises a first electric power generation all-in-one machine, the hydraulic power part comprises a hydraulic oil cylinder, and a piston of the hydraulic oil cylinder and a rotating shaft of the first electric power generation all-in-one machine are in transmission connection with the mechanical transmission part so that the piston of the hydraulic oil cylinder can do linear motion. Compared with the prior art, in the working process, the hydraulic power part is adopted to control the movement of the piston of the hydraulic oil cylinder, and the electric power part is adopted to control the speed, displacement and precision of the piston of the hydraulic oil cylinder, so that the advantages of high controllability of the electric power part and high transmission power density of the hydraulic power part are integrated; the control precision is high, the driving capability is strong, and the power density is high.

Description

technical field [0001] The present invention relates to a drive device, and more particularly to a linear drive device based on electro-hydraulic composite drive. Background technique [0002] The driving methods of traditional mechanical equipment mainly include pneumatic drive, motor drive and hydraulic drive. The working medium of pneumatic drive is air, which has the characteristics of low viscosity, small flow resistance and centralized air supply, but it is limited by compressibility. The position control accuracy is weak, and the rated working pressure level of the pneumatic drive device is low, which cannot match the pressure requirements of high-power equipment; the motor drive has the advantages of simple structure, simple control and high precision, but it is not suitable for applications to large In the power equipment, the size of the motor in the motor drive is relatively large, especially when the motor is installed in the actuator, not only the installation s...

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Problems solved by technology

[0002] The driving methods of traditional mechanical equipment mainly include pneumatic drive, motor drive and hydraulic drive. The working medium of pneumatic drive is air, which has the characteristics of low viscosity, small flow resistance and centralized air supply, but is limited by compressibility. Position control accuracy is relatively weak, and the rated working pressure level of the device driven by pneumatic pressure is low, which cannot match the pressure demand of high-power equipment; motor drive has the advantages of simple structure, simple control and high precision, but for large In the case of power equipment, the size of the motor in the motor drive is large, especially when the motor is installed in the actuator, not only the installation space is limited, but also an additional external load is added to the actuator, which greatly affects the actuator The hydraulic drive has the advantages of high power density, fast dynamic response, high pressure level and strong overload capacity, and is widely used in high-power mechanical equipment, but the hydraulic drive has the disadvantages of high energy consumption and low control accuracy

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