Hits:Updated:2020-05-12【Print】
Electronic tensile testing machine, also known as electronic tensile machine, is suitable for plastic films, composite materials, adhesives, adhesive tapes, stickers, medical patches, protective films, release paper, backing materials, rubber, paper fiber and other products Tensile, peeling, deformation, tearing, heat sealing, bonding, puncture force, opening force, low speed unwinding force and other performance tests. Tension machine fixtures are an important part of the instrument. Different materials require different fixtures. It is also an important factor for the smoothness of the test and the accuracy of the test results. The electronic tensile testing machine is mainly composed of a driving system, a measuring system, a control system, and a safety device.
1. Drive system
It is mainly used for the movement of the beam of the tensile testing machine.The principle is that the motor is controlled by the servo system, and the screw is rotated through a series of transmission mechanisms such as the reduction box to control the movement of the beam. The speed of the beam is changed by the change of the motor speed. change.
2.the measurement system
1. Displacement measurement: using imported photoelectric encoder to induce deformation
2. Deformation measurement: It is measured by an extensometer. It is used to measure the deformation of the sample during the test. There are two chucks on the electronic tensile testing machine device, which pass through a series of transmission mechanisms and are installed in the measuring device. The photoelectric encoder on the top is connected together.When the distance between the two chucks changes, the shaft of the photoelectric encoder is driven to rotate, and the photoelectric encoder will have a pulse signal output, and then the signal is processed by the single-chip processor. The deformation amount of the sample can be obtained.
3. Force value measurement: to achieve measurement through force sensor, amplifier and data processing system. The most commonly used force sensor is a strain gauge sensor. When an external force acts on the sensor, it causes deformation of the strain gauge inside the sensor, causing the bridge to be unbalanced, thereby causing a change in the output voltage, and by measuring the change in the output voltage. Get the magnitude of the applied external force. There are many kinds of strain gauge type sensors at home and abroad, mainly including cylindrical, spoke type, S double connected hole type, cross beam type and other sensors.
4. Measurement of the displacement of the beam: The test principle is roughly the same as the measurement of the deformation, and the displacement of the beam is obtained by measuring the output pulse number of the photoelectric encoder.
3. Control system of tensile testing machine
A system that controls the operation of the tensile testing machine. People can control the operation of the testing machine through the operation table, and the status of the testing machine and various test parameters can be known through the display screen.If the equipment is equipped with a computer, the computer can also collect and analyze data , Real-time display of test data and curves, storage of test results, automatic completion of test reports, and printing of test results. The communication between the tensile testing machine and the computer generally uses the RS232 serial communication method. It communicates through the serial port (COM number) behind the computer. This technology is relatively mature, reliable, and easy to use.
4. Safety device
1.Emergency shutdown device; up and down travel limit device; leakage automatic power off system;
2. Guaranteed overload overload shutdown; automatic breakpoint shutdown function.
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