Several important factors determining the performance and accuracy of electronic testing machine

There are several important factors that determine the performance and accuracy of electronic testing machine: 1 The ball screw, which drives the motion of sensor, will directly affect the large deformation and elongation after fracture of Zui test if there is a gap in the screw At present, some screw rods of electronic testing machine on the market are T-shaped common screw rods In this way, first, the gap is relatively large, second, the friction force is relatively large, and the service life is short The screw rods used by Jiangdu Kaiyuan testing machine factory are high-precision gapless ball screw rods of Germany, the surface quenching hardness is HRC58-62, and the service life can reach several decades And ensure the accuracy unchanged 2 The transmission system of the electronic testing machine At present, some of the transmission systems of the testing machine on the market adopt the reducer and some adopt the common belt The main disadvantages of these two transmission modes are: the first one needs to add lubricating oil regularly, while the latter one can not guarantee the synchronicity of the transmission to affect the test results The transmission system of the open source instrument adopts the full arc synchronous belt to reduce the speed, which ensures the synchronous accuracy of the transmission, high transmission accuracy, high efficiency, stable transmission, low noise and long service life without maintenance 3 Electronic testing machine The force sensor, because the quality of the sensor determines the accuracy and stability of the testing machine At present, the small force value of the sensor in the market is generally used by the S sensor, and the hub and spoke sensor is widely used The internal resistance of the sensor is generally the resistance strain chip, such as the poor accuracy of the strain gauge, the poor aging resistance of the strain gauge, or the material of the sensor Bad material will affect the accuracy and service life of the sensor The imported sensor used by the open source instrument is American Quanli sensor, a world famous sensor manufacturer The sensor has high precision, good linearity and very stable performance, which will not change for decades 4 The power source (motor) of the electronic testing machine is also called motor At present, some testing machines in the market use ordinary three-phase motor or frequency conversion motor This kind of motor adopts analog signal control, which has slow control response, inaccurate positioning and narrow speed regulation range If there is high speed, there will be no low speed or if there is low speed, there will be no high speed, and the speed control is not accurate The motor used in the open source instrument is Panasonic full digital AC servo motor in Japan The control mode adopts full digital pulse control, with a wide range of speed adjustment, up to 0.001-1000mm/min The control positioning is accurate and the response is fast 0.01 seconds can be added to the full speed, and the motor can ensure the accuracy of full range speed control It has a long service life of up to several decades without maintenance 5 The measurement and control system of electronic testing machine -- software and hardware At present, most of the measurement and control systems of tensile machines in the market are controlled by 8-bit single-chip microcomputer, with low sampling rate and poor anti-interference ability In addition, the AD converter, if the number of AD converter is also the resolution is low Then the measurement is not accurate The measurement and control system of open source instrument adopts the controller hytest V6.0 developed by the world's Zui advanced 32-bit ARM technology This controller is based on the 32-bit arm platform and runs the time multitask operating system developed by our company, which makes the program run more smoothly and the system more stable The sampling rate can reach 200 times per second In addition to the 24 bit high-precision low noise high-speed AD converter, the whole measurement and control system can control the whole test process with high accuracy and stability The software of the upper computer is the all digital three Bi loop control software developed by Hengyi company for two years There are two control modes A PID control and regulation mode B Mode Lake Control and regulation mode (the first in the industry) The whole test process can achieve constant force value control, constant displacement control, constant deformation control, low frequency fatigue control, and program arbitrary control Jiangdu Kaiyuan test Machinery Factory: