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.
CN102182729AActive Publication Date: 2011-09-14ZHEJIANG UNIV
5 Cites 16 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2011-09-14

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More