Large-flow high-frequency response electrohydraulic vibration device based on parallel servo valves and control method
An electro-hydraulic vibration and servo valve technology, applied in the direction of fluid pressure actuation device, fluid pressure actuation system components, mechanical equipment, etc., can solve the problems of complex structure, complex decoupling control, and multi-actuator parallel connection is not allowed.
Active Publication Date: 2013-05-01
ZHEJIANG UNIV
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Problems solved by technology
However, this method also has many disadvantages, such as the need to configure multiple sets of cylinders and servo valves, the parallel connection of multiple cylinders involves complex decoupling control problems, complex structure, and in some cases, it is not allowed to use multiple actuators due to the limitation of installation space. parallel structure
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[0039] Such as figure 1 As shown, the present invention is based on a large flow high-frequency response electro-hydraulic vibration device of servo valves in parallel, including an oil source 1, an oil return tank 2, two or more servo valves, a double rod symmetrical hydraulic cylinder 5, a controller 11 and a displacement sensor 7; The oil inlet of each servo valve is connected to oil source 1, the oil return port of each servo valve is connected to oil return tank 2, and the first working oil port of each servo valve is connected to the first working oil port of the double rod symmetrical hydraulic cylinder 5. One oil port is connected, the second working oil port of each servo valve is connected to the second oil port of the double-barrel symmetrical hydraulic cylinder 5; the displacement sensor 7 is connected with the piston rod of the double-barrel symmetrical hydraulic cylinder 5; the displacement sensor 7 and each servo valve are electrically connected to the controller ...
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The invention discloses a large-flow high-frequency response electrohydraulic vibration device based on parallel servo valves and a control method. The electrohydraulic vibration device comprises more than two servo valves; an oil inlet of each servo valve is connected with an oil source; an oil return opening of each servo valve is connected with an oil return tank; a first working oil port of each servo valve is connected with a first oil port of a double-rod symmetric hydraulic cylinder; a second working oil port of each servo valve is connected with a second oil port of the double-rod symmetric hydraulic cylinder; a displacement sensor is connected with a piston rod of the double-rod symmetric hydraulic cylinder; and the displacement sensor and the servo valves are all connected with a controller. By adopting a combined method for synchronously controlling the phase shift and the variable amplitude of instruction signals of the servo valves, the problem of desynchrony of valve core motion is solved, and the vibration amplitude generated by the double-rod symmetric hydraulic cylinder under the driving of all the servo valves reaches the maximum.
Description
Technical field [0001] The invention belongs to the field of fluid transmission and control, and relates to an electro-hydraulic servo vibration device and a control method, which is suitable for situations where a hydraulic cylinder is used to drive a load for sinusoidal or periodic motion in a hydraulic system. Background technique [0002] In hydraulic vibration devices such as hydraulic vibration tables and linear friction welding machines, the position and speed of the hydraulic cylinder are required to reciprocate according to a sinusoidal curve of a certain frequency. Generally, an electro-hydraulic servo control system driven by a servo valve to drive a hydraulic cylinder is used to achieve the above functions. The opening of the servo valve changes sinusoidally according to the command signal of the control system, and the speed and position of the hydraulic cylinder will also move sinusoidally at the same frequency. The zero position and amplitude of the hydraulic cyli...
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IPC IPC(8): F15B21/12
Inventor 魏建华方锦辉孔晓武
Owner ZHEJIANG UNIV