Professional production: tensile testing machines, tensile machines and other high-precision testing instruments, the measurement accuracy of the instruments has also reached the national accuracy level of 0.5. The tensile testing machine is manufactured according to the "Electronic Universal Testing Machine" GB/T 16491-2009 standard, and the GB/T16825-2010 "Inspection of Tensile Testing Machine" is verified and accepted. Standard tests and data are provided in strict accordance with national standards, industry standards and international standards.
The principle of the tensile machine, the tensile testing machine, the tensile machine is mainly composed of electrical and mechanical parts. The mechanical part is driven by the motor, and the speed is reduced to the required speed through the worm gear reducer, and then driven by the screw, through the positive and negative rotation of the motor , The center link plate moves up and down to match the clamp, thus realizing the tension and compression process. The transmission screw is equipped with three bearings. (two upper link plates, one bottom plate) There is a guide rod behind the screw rod, which is mainly used to guide the center link plate Keep the balance when rising and falling. The principle of measuring the displacement of the beam is roughly the same as that of the deformation measurement. The displacement of the beam is obtained by measuring the number of output pulses of the photoelectric encoder.
1. The measurement of the force value of the tensile testing machine is completed by the load cell, the amplifier and the data processing system. It is known from data mechanics that under the premise of small deformation, the strain ε at a certain point of an elastic element is proportional to the force on the elastic element, and is also proportional to the elastic deformation. Taking the sensor of the S-type testing machine as an example, Shanghai Farui Instrument adopts the imported sensor of the American brand. When the sensor is subjected to the effect of the tensile force P, because the elastic element is pasted with a strain gauge, the strain of the elastic element is proportional to the size of the external force P. , so the strain gauge is connected to the measurement circuit, and the output voltage can be measured, and then the size of the force can be measured.
2. The core device of the software operating system of the tensile machine adopts the latest imported ultra-high-precision 24-bit AD, and the sampling rate is 400 times/second. And the 3-point calibration technology is used to further improve the accuracy, and the power collection accuracy reaches the national level 0.1 standard. It communicates with the PC, and is equipped with the special FR2101Pro professional deluxe version measurement and control software, which displays the force-displacement, force-time, displacement-time, stress-strain and other curves in real time, and automatically calculates the maximum force, yield force, average force, maximum deformation, Yield point, elastic modulus and other parameters, and has flexible report editing and printing functions.
3. The deformation measurement is measured by the deformation measurement installation, which is used to measure the deformation of the sample during the experimental process. There are two chucks on the device, which are connected to the photoelectric encoder installed on the top of the measuring device through a series of biomechanical mechanisms. When the distance between the two chucks changes, the shaft of the photoelectric encoder is driven to rotate, and the photoelectric encoder The device will have a pulse signal output. The signal is then processed by the processor, and the deformation of the sample can be obtained. ,