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What are the factors that affect the accuracy of electronic universal tension machine?
There are many factors that affect the accuracy and performance parameters of electronic universal tension machines. The most important ones include the following five points:
1. Parts that drive the movement of the sensor Ball screw: Because the test data will be made in the future if there is clearance in the screw, it will directly affect the maximum deformation and elongation after the test. At present, the electronic universal pulling machine on the market has some T-shaped ordinary screw rods. In this case, the first gap is relatively large, and the second one is that the friction force is relatively short and the service life is short. The screw rod used by Shanghai Shigan Industrial Co., Ltd. is a German company Neff's high-precision gapless ball screw, surface hardening hardness for the servo-type universal testing machine, the service life of up to several decades. And to ensure the same accuracy.
2. The transmission system of electronic universal tension machine: At present, the test machine drive system on the market adopts the speed reducer, and some use the ordinary belt. The main disadvantages of these two transmission methods: the former needs regular lubrication, the latter is The synchronization of the drive cannot be guaranteed to affect the test results. The hard drive system of Shanghai Test Machine adopts full arc synchronous belt deceleration to ensure the synchronization precision of the transmission, high transmission accuracy, high efficiency, smooth transmission, low noise, and long service life without maintenance.
3, electronic universal tension machine force sensor: because the quality of the sensor determines the accuracy and stability of the test machine, the current market for the use of small force sensors generally use S-type sensors, strong value of the general use of wheel sensors The internal of the sensor is generally a strain gauge type. If the strain gauge is not accurate or the anti-aging ability of the fixed strain gauge is not good or the sensor's material is not good, it will affect the accuracy and service life of the sensor.
4. Power source of electronic universal tensile machine: At present, some testing machines on the market use ordinary three-phase motors or variable frequency motors. Such motors adopt analog signal control, control response is slow, positioning is inaccurate, and the general speed range is narrow. There is no high speed, no speed, or no speed, no speed, and speed control is inaccurate. The Shanghai Shigan Motor is Panasonic's all-digital AC servo motor. The control method adopts all-digital pulse control, which has a wide speed range and accurate control positioning. The response is fast, 0.01 seconds can be added to the full speed. The motor can guarantee accurate full-scale speed control, long service life, up to several decades, and no maintenance.
5. Measurement and control system of electronic universal tension machine: At present, the measurement and control system of most of the tensile machines on the market adopts 8-bit MCU control, the sampling rate is low, and the anti-jamming capability is poor, the other is the AD converter, if the AD converter The number of bits is the low resolution. Then the measurement will not be accurate. The Shanghai monitoring and control system is implemented using the world's 32-bit ARM technology controller HytestV6.0. This controller is based on the 32-bit ARM platform, and run the task operating system, the program runs more stable, the system is more stable. Sampling rate up to 200 times per second, in addition to 24-bit high-precision low-noise sound high-speed AD converter, so that the entire measurement and control system more high-precision, high-stability control of the entire test process, the host computer software for the Shanghai real time duration Two years of development of all-digital three-loop control software, there are two control methods a. PID control adjustment method b. Modular lake control adjustment. The entire test process can achieve constant force value control, constant displacement control, constant deformation control, low frequency fatigue control, and program arbitrary control.
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