The tensile testing machine adopts a microcomputer to control the full digital wide frequency electro-hydraulic servo valve to drive the precision hydraulic cylinder. The microcomputer control system automatically controls various modes of test force, displacement and deformation to complete the stretching, compression and bending resistance of the sample. The test is in accordance with the requirements of the national standard GB/T228-2002 "Metal materials tensile test method at room temperature" and other standard requirements. What should I do if the displacement in the tensile tester is inaccurate? Wuhan Warwick summarizes the following methods for your reference based on actual experience:
1. Check the tensile tester displacement sensor Because the tensile tester system is a closed-loop system, to determine which part of the system has a fault, first disconnect the circuit in the system, so that the system becomes an open loop system. If it is normal to judge the sensor signal, the feedback signal of the displacement sensor must be disconnected to make the system open loop. At this time, a control actuator movement signal is sent from the workstation, and then the sensor feedback value is measured. After repeated several times, when the feedback data of the sensor is measured as a linearly varying straight line, the sensor is determined to be normal.
2. Check the tension tester amplifier unit, in addition to the displacement sensor failure, and then check if the amplifier unit is normal. First disconnect the output signal of the amplifier unit. Remove the output wiring, add a DC input signal to the amplifier unit through the workstation, and measure the output of the amplifier unit. After repeated reset, the measured output signal of the amplifier unit changes linearly to determine that the amplifier unit is normal.
3. Check the tension tester system setting. The display of the actuator is found to be only 10mm. Under normal conditions, it should be 50mm. If there is a problem with the system settings, the system needs to be reset. After resetting the actuator's stroke to 50mm, the displayed value on the display panel of the workstation is still incorrect. Therefore, it is considered that only the repositioning system can solve the fault.
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