Device capable of testing elastic properties of springs in wide low-temperature zones

Abstract

The invention discloses a device capable of testing elastic properties of springs in wide low-temperature zones. The device comprises a spring cavity for accommodating a tested spring and a testing system for spring force and deformation of the tested spring. The device is characterized in that the spring cavity is arranged in a cold trap, the cold trap is sequentially provided with a heat-insulation layer, a low-temperature cavity and the spring cavity from outside to inside, the spring cavity is placed on the inner upper portion of the low-temperature cavity and is isolated from the low-temperature cavity, the low-temperature cavity is provided with an inlet and an outlet which are communicated with a low-temperature working medium distribution system, the heat-insulation layer is wrapped on the outer portion of the low-temperature cavity, and a heat-insulation sandwich layer which is filled with air or is vacuum is arranged between the heat-insulation layer and the low-temperature cavity.

Description

technical field [0001] The invention relates to a device for testing the elastic performance of a compression spring, in particular to a device for testing the elastic performance of a compression spring in a temperature range from room temperature to -268°C. Background technique [0002] With the development of science and technology, cryogenic devices are used more and more widely. The accurate measurement of the elastic coefficient of springs used in these devices plays an important role in the design and use of springs. In particular, shape memory alloy springs work under different temperature conditions. When testing their elastic properties, the test environment needs to be controlled in the low temperature environment used. Due to the small size of the spring, it is not realistic to use a low-temperature refrigeration system to provide a test environment. On the other hand, when testing the elastic performance of the spring, the deformation and spring force of the sp...

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Problems solved by technology

Due to the small size of the spring, it is not realistic to use a low-temperature refrigeration system to provide a test environment

On the other hand, when testing the elastic performance of the spring, the deformation and spring force of the spring must be tested. Neither the displacement sensor nor the force sensor is suitable for exposure to low temperature environments.

The invention patent with the application number 200710120292.2 provides a device for testing the low-temperature elastic properties of springs using liquid nitrogen as the working medium, but it is difficult for this device to stabilize the spring at a certain test temperature

At present, there is no mature technology in China, which can continuously adjust the temperature of the spring in a wide low temperature range (normal temperature to -268°C or -196°C), and can maintain the spring at a certain temperature in a wide low temperature range

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