Servo-pump-controlled hydraulic rotary driving system and control method

Abstract

The invention provides a servo-pump-controlled hydraulic rotary driving system and a control method. According to the system, a hydraulic motor is connected with two hydraulic pumps which are connected with a servo motor and controlled by a servo driver and the servo motor. A motion control unit is connected with the servo driver and two pressure sensors arranged on a hydraulic motor connecting pipeline. An angular displacement sensor on the hydraulic motor is connected to the motion control unit. The control method includes the steps that the servo motor rotates positively and negatively to drive the pumps to rotate positively and negatively, and then the hydraulic motor is driven to rotate positively and negatively. The motion control unit precisely and quickly controls the angular displacement, the speed and the torque of the hydraulic motor according to set requirements and feedback of pressure and angular displacement. According to the servo-pump-controlled hydraulic rotary driving system and the control method, the high response frequency and high precision control of the hydraulic motor can be achieved, and wide-range gear ratio adjustment can be conveniently achieved. The servo-pump-controlled hydraulic rotary driving system is simple in structure, low in cost and reliable in control.

Description

technical field [0001] The invention relates to a hydraulic precision transmission control device, specifically a servo pump-controlled hydraulic rotary drive system and a control method. The invention uses a servo motor to drive two one-way pumps or one two-way pump, and then controls the power output of the hydraulic motor to realize High-precision and high-response rotary motion control. Background technique [0002] It is a commonly used power structure to control the rotary motion and power output through the hydraulic motor. The traditional hydraulic rotary drive system is a motor-driven hydraulic pump that runs continuously. The oil circuit composed of various valve groups, sensors and pipelines controls the flow of hydraulic oil. , flow rate, pressure, drive the hydraulic motor, and then realize the control of the external output torque and rotation speed of the hydraulic motor. In the traditional pump control system, when it is necessary to control the rotation spe...

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Problems solved by technology

[0003] This type of traditional hydraulic slewing drive system has the following disadvantages: 1. The motor driving the hydraulic pump must run continuously and uninterruptedly. The output and hydraulic oil return to the oil tank through the valve group, wasting electric energy

Especially when the hydraulic motor outputs torque, but the rotation stops or the speed is low, the high-pressure throttling increases the power consumption of the motor and wastes electric energy; 2. The wasted electric energy turns into heat energy, which causes the oil temperature to rise and accelerate the oil seal Aging increases the failure rate; 3. When the hydraulic oil reciprocates between the oil inlet and the oil outlet of the hydraulic motor, it is necessary to control various valve actions, and the throttling action is continuously generated, which increases the system loss and the failure rate of the valve. It is also relatively high; 4. In fast and precise control, it is necessary to use P / Q valve (pressure flow control valve) or servo valve to participate in the control, especially the servo valve is expensive and difficult to maintain, resulting in the purchase, use and maintenance of system equipment. 5. Since the mechanical actions of various valves take a long time to complete, it is difficult to further speed up the switching of various actions of the oil circuit, which directly affects the working rhythm of the equipment; 6. For precise control and high-speed response occasions , even if a high-performance servo valve is used to participate in the control, due to the inherent dead zone characteristics and nonlinear characteristics of the servo valve, it is difficult to achieve higher precision and higher frequency servo control of the hydraulic motor; 7. It is difficult to do traditional oil circuits To the sealed oil circuit, the reliability of the oil circuit is difficult to guarantee, and the amount of hydraulic oil used is relatively large

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