Tensile testing machine is used as a commonly used testing instrument, the ball screw, sensor, motor, software and hardware of the tensile testing machine. and the transmission system are the components of the testing machine. Important components, their quality is related to the accuracy of the experimental data, how to choose a high-quality testing machine, these five factors play a crucial role.
1. Ballscrew
Electronic universal testing machines currently use ball screwsand trapezoidal screw drives. In general, the gap of the acme screw is relatively large, the friction force is relatively large, and the service life is short. At present, some manufacturers in the market will use acme screws instead of ball screws to save costs and get higher profits.
Second, the sensor
The sensor is the accuracy of the testing machine and the important part is the stability of the force measurement. Types of universal electronic testing machine sensors currently on the market include S-type and spoke-type. The accuracy of the internal strain gauge of the sensor is not high, the aging resistance of the adhesive used to fix the strain gauge is not good, and the material of the sensor is not good, which affects the accuracy of the sensor.
3. Motor
High-quality electronics The universal testing machine motor uses AC servo speed control system, Panasonic AC servo motor, a stable and reliable performance with over-current, over-voltage, overload and other protections. currently on the marketThere is also a universal electronic testing machine, using ordinary three-phase motors or variable frequency motors. This type of motor is controlled by analog signals, the control response is slow, and the positioning is not accurate. In general, the speed range is narrow., and the speed control is accurate.
Four, software and hardware
The high-quality electronic universal testing machine adopts a brand computer, and the control system software is the operating system platform WINOOWsXP. It has the characteristics of afast running speed, smooth interface and simple operation. It can meet the test and measurement needs of various materials. It can be based on national standards, international standards or industry standards. Tests to measure the physical properties of various materials.
V. Transmission system
Electronics It There are two main types of gear parts of the universal testing machine, one is the arc synchronous gear gear and the precision screw pair gear; the other is the ordinary belt transmission.
The first transmission mode has stable transmission, low noise, high transmission efficiency, high precision and long service life. The second transmission method cannot guarantee the synchronization of transmission, so the accuracy and stability are not as good as bin the first transmission system.
