Electro-hydraulic loading system of film biaxial tensile testing machine

Abstract

The invention discloses an electro-hydraulic loading system of a film biaxial tensile testing machine. The electro-hydraulic loading system comprises a low-pressure filter, hydraulic pumps, a motor, a one-way valve, a stop valve, an energy storage device, an electromagnetic unloading valve, a proportional overflow valve, a pressure compensator, a proportional directional valve, a servo hydraulic cylinder, a pull pressure sensor, a displacement sensor, a mechanical fixture, a filter, a cooler and an oil tank, wherein the two hydraulic pumps share the one oil tank, and two independent loading hydraulic loops can be formed, so that the manufacturing cost and the installation space are greatly saved. Furthermore, the servo hydraulic cylinder can be controlled by the single set of pressure compensator and proportional directional valve, so that loading synchronism and stability can be guaranteed. The electro-hydraulic loading system of the film biaxial tensile testing machine has the characteristics of being simple in structure, large in tensile force, high in loading synchronism and accuracy, rapid in control response and the like, and can be used for film composite material biaxial tensile testing machines such as an architectural membrane material tester and an airship skin test as well as a uniaxial drawing tester.

Description

technical field [0001] The invention relates to an electromechanical-hydraulic loading system for a tensile test, in particular to an electromechanical-hydraulic loading system for a film biaxial tensile test. Background technique [0002] Polymer composite fabric film materials are used in modern architectural structures, aerospace and other industrial fields due to their advantages of light weight, high strength, chemical resistance, and durability, such as architectural membrane structures, aviation airships, aerospace parachutes or soft landing systems wait. The fabric film is generally composed of a base cloth and a coating. The base cloth is made of polymer materials to spin synthetic fibers, and then woven into cloth. In the field of construction, there are mainly polyester fibers, glass fibers, etc. In the field of aerospace, there are mainly polyester fibers, Aramid fiber, nylon fiber, etc., the coating mainly includes polytetrafluoroethylene and polytetrafluoroeth...

AI Technical Summary

Problems solved by technology

General-purpose structural laboratory electro-hydraulic loading systems (such as MTS, etc.) are very complex in structure and expensive. So far, there are few electro-hydraulic loading systems specific to film biaxial tensile testing machines. Therefore, the current domestic research on fabric film materials The main mechanical parameters and design and application basis are mainly derived from unidirectional experiments, but there are few experiments using film biaxial tensile testing machines to test the biaxial mechanical behavior of fabric and film materials, so the development of film biaxial tensile test electromechanical hydraulic loading system is of great significance. Significance

[0004] After searching the existing technical literature, it was found that Chinese patent application number 201110107672.9, patent name: film biaxial tensile test electro-hydraulic loading system, the patent uses an integrated system such as servo hydraulic cylinder, proportional overflow valve, proportional reversing valve, etc. Realize dual-channel four-cylinder coordinated loading, but the loading synchronization and pressure holding are not ideal

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