The electronic tensile machine is also called the tensile testing machine or the universal material testing machine. The tensile test of the tensile testing machine: the tensile test (stress-strain test) generally involves clamping the two ends of the material sample on two fixtures at a certain distance. The two clamps separate and stretch the specimen at a certain speed, and measure the stress change on the specimen until the specimen is broken. The tensile test of the tensile machine is one of the widely used methods for studying the mechanical strength of the material, and it is necessary to use constant speed motion. According to the different methods of load measurement, the early stage can be roughly divided into two types: pendulum type tensile testing machine and electronic tensile testing machine. At present, the pendulum type tensile testing machine is rarely used in the market. Mainly the accuracy can not meet the current standard requirements. The tensile testing machine is also called the FR-103C servo tensile machine. The microcomputer control electronic universal material testing machine is suitable for hardware, rubber, plastic and textile. Tensile test of materials such as waterproof materials, wire and cable, safety ropes, net ropes, metal wires, metal rods, and slabs, etc., and additional attachments can be used for compression and bending tests. All microcomputer control, and dynamically display the magnitude and change of force value and deformation, the test speed can be adjusted 0.001~500mm/min, the sample is automatically stopped or returned to the initial position, peak hold and other functions.
Structural principle
The tensile machine adopts electromechanical integration design, which consists of main body part, mechanical part, hydraulic system and force measuring system. The measuring force system is mainly composed of load cell, transmitter, microprocessor, load drive mechanism and computer. Test principle The tensile tester test is to clamp the sample between the upper clamp and the lower clamp. One of the furniture is fixed, and the other clamp moves up or down until the large value and displacement of the Zui are recorded after the break, and then the tensile strength can be calculated by software. Shear strength, peel strength, yield strength, ring compression strength, tensile, compression, bending, tearing, shearing, etc. The larger the load of the tension machine, the larger the machine is, and the smaller the load sensor is, the higher the accuracy. Of course, the larger the machine, the more expensive it is. So the tension machine is not as big as possible. It is to adapt to the size of the product's strength. Sensors on the market are divided into imported and domestic. Domestic sensors are cheaper, but poor accuracy produces zero drift. On the contrary, the imported sensor has high precision and good repeatability, but the price is relatively expensive. The main part of the tensile testing machine zui is the sensor. When testing, the sensor outputs a power signal to the processor. If the output signal is not accurate, the processed data will definitely not be accurate, and the tensioning machine loses its monitoring and testing capability.
Steps:
1. Turn on the main switch and turn on the power switch of the test machine to check whether the various parts of the machine are running normally and prepare for the test.
2. Before the test, the zui large load of the test should be estimated, and the suspension should be adapted. Adjust the cushion valve handle and align the marking.
3. Roll the recording paper on the drum of the plotter (this item is only needed when needed).
4. Start the oil pump motor, open the oil supply valve, close the oil return valve, so that the oil in the oil tank enters the working oil cylinder, the test stand rises, and then open the oil return valve to remove the air inside the oil cylinder. Then close the oil return valve, re-open the oil supply valve to raise the test bench by 5-10mm, and then close the oil valve. If the test bench is in the raised position, it is not necessary to first start the oil pump to supply oil, and only the return valve can be closed.
5. Clip one end of the sample to the upper jaw, start the oil pump to adjust the pointer to the zero point, and then actuate the lower jaw motor to adjust the lower jaw to clamp the lower end of the test piece. Care must be taken to keep the specimen plumb and in the middle.
6. Lower the drawing pen on the putter and enter the drawing preparation state (only when drawing is required).
7. According to the loading speed required by the test, adjust the rotation speed of the loading speed indicator disc by twisting, slowly open the oil delivery valve, and make the loading speed of the loading pointer coincide with the rotation speed of the indicator disc for loading.
8. After the sample breaks, close the oil supply valve and stop the oil pump motor.
9. Record the desired value and lift the pen.
10. Open the oil return valve and turn the passive needle back to zero after unloading.
11. Remove the sample after the fracture, measure the elongation value, and record it carefully as the calculation basis.
12, after zui, cut off the power supply, wipe the equipment and wipe.
13. Tests such as compression and bending can be operated by referring to the above items.
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