Important factors in performance and accuracy of tensile testing machine

1. First of all, the force value sensor of the tension machine. Because the quality of the sensor determines the accuracy and force stability of the test machine. Currently, the sensors for electronic tension machines on the market generally use S-type sensors for small force values, and the large force values ​​are generally use wheel sensors. The internal sensor is generally a resistive strain gauge type. If the accuracy of the strain gauge is not high or the anti-aging ability of the glue used to fix the strain gauge is not good or the material of the sensor is not good, it will affect the accuracy and service life of the sensor. The imported sensor used is the world-renowned sensor manufacturer, the United States Quanli Sensor. The sensor has high accuracy, good linearity, and very stable performance, and will not change for decades.

2. The second is the ball screw that drives the sensor movement, because if there is a gap in the screw, the test data made in the future will directly respond to the deformation and elongation after break. Some screws on the market currently use ordinary T-shaped screws. In this way, the gap is relatively large, and the friction is relatively large and the service life is short. The screws used are German Youli Nieff's high-precision, gapless ball screws, with a surface quenching hardness of HRC58-62, and a service life of up to several decades. And ensure the accuracy remains unchanged.

3. Another thing is the transmission system of the tensile machine. Some of the transmission systems of the electronic universal test machines on the market use reducers, while others use ordinary belts. The main disadvantages of these two transmission methods: the first type requires regular lubricating oil, while the latter type cannot ensure that the synchronization of the transmission affects the test results. The company's tensile machine transmission system uses a full arc synchronous belt to reduce the speed, ensuring the synchronization accuracy of the transmission, high transmission accuracy, high efficiency, stable transmission, low dry sound, and long service life without maintenance.

4. Again, the power source (motor) of the tension machine is also called a motor. Currently, some tension machines on the market use ordinary three-phase motors or variable frequency motors. This kind of motor uses analog signal control, slow control reaction, inaccurate positioning, generally, narrow speed regulation range, low speed, low speed, low speed, low speed, and low speed, and inaccurate speed control. The motor used by the company's tension machine is Japan Panasonic full digital AC servo motor, and the control method adopts full digital pulse control, with a wide speed regulation range,

It can reach 0.001-1000MM/MIN, with accurate control and positioning and fast response. It can be added to the full speed in 0.01 seconds. This motor can ensure accurate full-scale speed control and long service life, up to decades and no maintenance is required.

5. It is the measurement and control system of the tensile machine (that is, software and hardware). Currently, most of the tensile machine measurement and control systems on the market use 8-bit microcontroller control, with low sampling rate and poor anti-interference ability. In addition, if the number of bits of the AD converter of the AD converter is low, the resolution is low. Then the measurement will not be accurate. The company's measurement and control system uses the world's advanced 32-bit ARM technology to develop controller HytestV6.0. This controller is based on the 32-bit ARM platform and runs the time-based multi-tasking operating system developed by our company. The program runs smoother and the system is more stable. The sampling rate can reach 200 times per second. With the addition of a 24-bit high-precision low-solar sound high-speed AD converter, the entire measurement and control system has a higher accuracy and high stability to control the entire test process. The software of the computer is the company's full-digital three-district control software developed over 5 years. There are two control methods: 1. PID control and adjustment method 2. Mohu control and adjustment method (the first in the industry). This allows the entire test process to achieve constant force value control, constant displacement control, constant deformation control, low-frequency fatigue control, and arbitrary program control.