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How to distinguish superior and inferior products of universal tensile testing machine?

Source：Chengde Jinjian Testing Instrument Co., Ltd　  　Views：897　  　Time：2021-01-26

1. Software and hardware: the high-quality tensile testing machine adopts brand computer, and the control system software is Windows XP operating system platform, which has the characteristics of fast running speed, mild interface, simple operation, etc. it can meet the test and measurement needs of different materials, and can measure the physical properties of various materials according to national standards, international standards or industry standards.

2. Ball screw: there are ball screw and trapezoidal screw currently used in tensile testing machine. Generally speaking, the trapezoidal lead screw has large clearance, large friction force and short service life. At present, some manufacturers in the market will use trapezoidal screw instead of ball screw in order to save costs and obtain greater profits.

3. Motor: high quality tensile testing machine motor adopts AC servo speed control system, Panasonic AC servo motor, stable and reliable performance, transformer test has over-current, over-voltage, overload and other protection devices. At present, there is also an electronic universal testing machine on the market, which adopts ordinary three-phase motor or variable-frequency motor. This motor adopts analog signal control, with slow control response and inaccurate positioning. Generally, the speed range is narrow. If there is high speed, there is no low speed, or if there is low speed, there is no high speed, and the speed control is not accurate.

4. Sensor: the sensor is an important part of the accuracy and force stability of the tensile testing machine. At present, the types of sensors on the market are S-type and spoke type. The accuracy of the sensor is affected by the poor accuracy of the internal resistance strain gauge, the poor aging resistance of the adhesive used in the fixed strain gauge, and the poor material of the sensor.

5. Transmission system: there are mainly two kinds of transmission part of tensile testing machine: one is arc synchronous gear belt, precision screw drive; the other is ordinary belt drive. The first transmission mode has stable transmission, low noise, high transmission efficiency, high precision and long service life. The second transmission mode can not guarantee the synchronization of the transmission, so the accuracy and stability are not as good as the first transmission system.


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