Method and device for unloading and anti-shock of large-volume servo cylinder
A servo oil cylinder, anti-shock technology, applied in servo motor components, fluid pressure actuating devices, fluid pressure actuating system components, etc., can solve the problems of unloading impact, unsynchronized unloading of front and rear chambers, and unloading speed gap.
Active Publication Date: 2020-09-18
CHINA AIRPLANT STRENGTH RES INST +1
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Problems solved by technology
However, due to the large amount of oil in the front and rear chambers of the large-volume oil cylinder, when the volume difference between the front and rear chambers is large, there will be a large gap in unloading speed, which will lead to asynchronous unloading of the front and rear chambers. Externally, the oil cylinder outputs a certain load. This phenomenon is unloading. shock
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[0028] In order to make the objectives, technical solutions and advantages of the implementation of the application clearer, the technical solutions in the implementation modes of the application will be described in more detail below with reference to the drawings in the implementation modes of the application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the present application. The embodiments described below by referring to the figures are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection of this application. Embodiments of the pr...
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The invention provides an unloading anti-impact method and device of a large-capacity servo oil cylinder, and belongs to the technical field of hydraulic servo control. The method includes the steps that the first ratio of the length of a first cavity of a rod cavity to the length of a second cavity of a rodless cavity in the unloading process is acquired; the opening degrees of a first proportional valve mounted on an oil return flow path of the rod cavity and a second proportional valve mounted on an oil return flow path of the rodless cavity are determined, and the second ratio of the opening degree of the first proportional valve to the opening degree of the second proportional valve is equal to the first ratio; and the first proportional valve is controlled according to the opening degree of the first proportional valve, and the second proportional valve is controlled according to the opening degree of the second proportional valve. By means of the method, by controlling openingsof the two proportional switching valves, finally pressure relief of the front cavity and the rear cavity is synchronous, the purpose of eliminating unloading impact is achieved, and impact force is reduced through synchronous pressure relief.
Description
technical field [0001] The application belongs to the technical field of hydraulic servo control, and in particular relates to a method and device for unloading and anti-shock of a large-volume servo cylinder. Background technique [0002] In many industries such as aviation, aerospace, coal mines, ships, high-speed rail, petroleum, etc., in the strength test of product components or products as a whole, hydraulic servo loading is used more and more. Hydraulic cylinders generally include a cylinder body and a piston set in the cylinder body. Rod, the spool at the bottom of the piston rod divides the cylinder into a rod chamber and a rodless chamber (front and rear chambers). During the cylinder servo loading test, the two states of loading and unloading are switched through the reversing valve. In the loading state, the front and rear chambers of the oil cylinder are connected to the servo valve, and the high pressure and oil return passage of the hydraulic system are conne...
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IPC IPC(8): F15B21/08F15B13/02
Inventor 王凯李扬眉聂珊珊姜小玉贺伟李洪文李碧波张积广赵文华
Owner CHINA AIRPLANT STRENGTH RES INST