A pressure control system for a valve-controlled asymmetric cylinder and its control method

Abstract

The invention discloses a pressure control system of a valve-controlled asymmetric cylinder. The pressure control system comprises an asymmetric cylinder, a piston and a piston rod are arranged in theasymmetric cylinder in a cooperating mode, one end of the piston rod extends out of the asymmetric cylinder and is connected with a three-jaw chuck, and the three-jaw chuck is connected with a secondservo motor; the positions where a rod cavity and a rodless cavity are located, of the asymmetric cylinder jointly communicate with a three-position four-way electromagnetic directional valve throughpipelines, furthermore a temperature sensor is arranged on each connecting pipeline, the three-position four-way electromagnetic directional valve further communicates with a hydraulic pump through apipeline, a pressure sensor is arranged on the connecting pipeline, and the pressure sensor and the two temperature sensors are jointly connected with a signal acquisition instrument; and the hydraulic pump is connected with a first servo motor, and the signal acquisition instrument, the first servo motor and the second servo motor are jointly connected with a control mechanism. According to thepressure control system of the valve-controlled asymmetric cylinder, the pressure of the electro-hydraulic servo system can be simply and effectively controlled, and the optimal energy-saving purposecan be achieved. The invention further discloses a method for carrying out pressure control by adopting the system.

Description

technical field [0001] The invention belongs to the technical field of fluid transmission and control, and in particular relates to a pressure control system of a valve-controlled asymmetric cylinder, and also relates to a pressure control method using the system. Background technique [0002] The electro-hydraulic servo system has the characteristics of fast response, high rigidity, compact structure, small inertia, and high precision. It is now widely used in industrial machinery, walking machinery, aerospace, ships, and marine development projects. In the electro-hydraulic servo system, the valve-controlled asymmetric cylinder is widely used because of its simple structure, low cost, small working space and large bearing capacity. Pressure is one of the basic control parameters of the electro-hydraulic servo system, and it is extremely important to study the pressure control method in the electro-hydraulic servo system to optimize the structure of the electro-hydraulic se...

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Problems solved by technology

However, this system must form a double closed-loop feedback loop through position, speed and pressure sensors on the basis of accurate modeling to achieve the purpose of controlling the system pressure, but the hydraulic system is a typical nonlinear, time-varying system, and the system has time-varying parameters As well as the uncertainty caused by various external disturbances, it is difficult to establish an accurate mathematical model

Even if the structure and parameters of the hydraulic part are determined, the performance of the system depends on the system control part, which puts high demands on the system control part. If there is a problem in the control part, it will make the entire electro-hydraulic servo system difficult to work normally. Bring safety hazards and economic losses to practical engineering applications

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