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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 decoupling control, not allowing the use of multiple actuators in parallel, complex structure, etc.

Active Publication Date: 2011-09-14
ZHEJIANG UNIV
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  • Abstract
  • Description
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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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  • Large-flow high-frequency response electrohydraulic vibration device based on parallel servo valves and control method
  • Large-flow high-frequency response electrohydraulic vibration device based on parallel servo valves and control method
  • Large-flow high-frequency response electrohydraulic vibration device based on parallel servo valves and control method

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Embodiment Construction

[0039] Such as figure 1As shown, the large-flow high-response electro-hydraulic vibration device based on the parallel connection of servo valves in the present invention includes an oil source 1, an oil return tank 2, more than two 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 with the oil source 1, the oil return port of each servo valve is connected with the oil return tank 2, and the first working oil port of each servo valve is connected with the first working oil port of the double-rod symmetrical hydraulic cylinder 5. One oil port is connected, and the second working oil port of each servo valve is connected with the second oil port of the double-rod symmetrical hydraulic cylinder 5; the displacement sensor 7 is connected with the piston rod of the double-rod symmetrical hydraulic cylinder 5; the displacement sensor 7 and each servo valve are electrically connected...

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Abstract

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 vibrating device and a control method, which are suitable for occasions where a hydraulic oil cylinder is used to drive a load to perform 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, the above functions are realized by an electro-hydraulic servo control system driven by a servo valve to a hydraulic cylinder. 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 according to the same frequency. The zero position and amplitude of h...

Claims

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Application Information

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IPC IPC(8): F15B21/12
Inventor 魏建华方锦辉孔晓武
Owner ZHEJIANG UNIV
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