1. The measurement and control system of the test machine. At present, most of the measurement and control system of the pull machine on the market is controlled by 8 bit microcontroller. The sampling rate is low, and the anti-interference ability is poor. In addition, the AD converter is also used. If the number of AD converters is low, then the measurement is not accurate.
Two, the force value sensor of the test machine. Because the sensor determines the accuracy of the test machine and force stability, the current Rally machine on the market with a small force sensor value of S sensor is generally used, large value spoke sensor for general use, the sensor is generally resistance strain gage, if the accuracy is not high or fixed with plastic strain aging resistance not good or bad sensor materials will affect the precision and service life of the sensor.
Three. The transmission system of the test machine. At present, some of the main disadvantages of the two transmission modes are the reducer used in the test machine transmission system, some ordinary belts, and the conventional ones. They need regular lubricating oil, and the latter can not guarantee the synchronicity of the transmission, which will affect the test results.
Four. The ball screw of the moving part of the test machine. Because the wire rod if the experimental data gap if future, will directly affect the deformation and elongation test.
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