How to improve the accuracy of measurement of hydraulic universal testing machine

Jinan Hengsi Shanda Co., Ltd. will introduce to you how to improve it todayHydraulic universal testing machineThe accuracy of the measurement? Jinan Hengsi Shanda has summarized the following six points for everyone:
, About the selection and loading and unloading of test fixtures: to ensure the safety of test operations and the accuracy of test results. To prevent the sample from being clamped firmly and the sample slipping. Generally, circular jaw clamp is used for round samples, and flat jaw clamp is used for flat samples. When the sample size is at the critical size of the clamp, try to choose the smaller one. When installing fixtures, do not start the oil pump motor and leave the machine in a power-off state. Push the clamp into the dovetail groove of the lining plate, and the chamfered side of the clamp follows the direction of the pressure being applied to the sample. Lock the small baffles on both sides of the lining plate to prevent the clamps from deviating.
Second, regarding the startup sequence: When the test software is fully started. The machine can only run (the oil pump can start). Therefore, before the test machine is conducted, the measurement system must be started first. The startup sequence is: monitor → printer → computer → industrial control machine → start the test software → hydraulic source.
Third, regarding the loading and unloading of the sample: clamp the sample. The flat sample must be perpendicular to the fixture and cannot be tilted. The clamping part should be long enough, and when clamping the upper and lower chucks of the clamp length should be less than 3/4 of the clamp length, it is strictly forbidden to lift and lower the cross beam.
Fourth, regarding the zeroing of force value: There is a sensor bar on the main interface of the software. It can display the values ​​of four types of sensors, namely test force, displacement, extensometer, and peak force. Generally, after clamping the test piece and clamping the extensometer, each sensor must be cleared before starting the running test. However, the zeroing of the force sensor is quite special. First, clamp the upper chuck of the stretching clamp, then adjust the lower cross beam to an appropriate position, clear the force value, and then clamp the lower chuck.
Fifth, regarding the conversion of switches: The conversion switch on the hydraulic source panel is used to control the conversion of the oil circuit. When the test starts running, turn the switch to the loading gear; after the test is finished, then switch to the quick reversal gear to the piston back to the end. If the piston is lowered first, the broken samples will be against each other and destroy the jaws.
Sixth, regarding the extensometer:Hydraulic universal testing machineThere is also an important attachment. It is mainly used for tests with less deformation of the sample, such as determining the elastic modulus of the data and specifying non-proportional extension strength.

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