Test method for compressing cold resistance coefficient of vulcanized rubber

Abstract

The invention belongs to the field of measurement and detection, and particularly relates to a test method for compressing cold resistance coefficient of vulcanized rubber. The technical scheme of theinvention is as follows: the method employs a compression device and a measuring device of a compression cold resistance tester, the compression device comprises a hand wheel, a frame, a pressure transmission rod, a pressure block, a platform, a heat insulation mat, a support rod and a sleeve, the measuring device comprises a dial indicator and a connecting rod; the compression device is placed on a low temperature tank of a low-temperature embrittlement testing machine through a bracket, the test temperature is controlled by the low-temperature embrittlement testing machine, and the test isimplemented by the compression device and the measuring device. The method provided by the invention uses machines for refrigeration, performs automatic cooling and temperature reduction, automatic heat preservation and mechanical temperature control, is small in range of test temperature fluctuation, small in data dispersion, more accurate in data and high in test efficiency, reduces labor intensity and avoid safety accidents.

Description

technical field [0001] The invention belongs to the field of measurement and detection, and in particular relates to a method for testing the compression cold resistance coefficient of vulcanized rubber. Background technique [0002] The current rubber compression cold resistance coefficient test method is "HG / T3866-2008 Determination of Vulcanized Rubber Compression Cold Resistance Coefficient", and the compression cold resistance tester is used to measure the rubber compression cold resistance coefficient. The test standard is to compress the sample to a certain height, then freeze it at a low temperature and measure the elastic recovery performance after the compression load is removed at this temperature. [0003] The test instrument is a compression cold resistance tester, including a thermos bottle, a compression device and a measuring device; figure 1 As shown, the compression device includes a hand wheel, a stand, a pressure transmission rod, a pressure block, a pla...

AI Technical Summary

Problems solved by technology

[0008] Disadvantages of this test method: (1) The use of cryogenic bottles has poor heat preservation effect, slow cooling, and low test efficiency; (2) Adding refrigerant to cool down is not only costly, but also easily burns the operator, posing safety hazards; (3) The test temperature fluctuates greatly, and the temperature cannot be guaranteed during the test process, resulting in inaccurate test data and large dispersion of data

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