Dried food! The correct usage method of high and low temperature tensile testing machine is revealed

　　The high and low temperature tensile testing machine is a material testing equipment that integrates mechanical performance testing and temperature environment simulation. It is widely used for evaluating the tensile performance of metals, polymers, composite materials, etc. under harsh temperature conditions. To ensure the accuracy of test data and the safe operation of equipment, operators need to master the correct usage methods. The following are the key operating steps and precautions for the high and low temperature tensile testing machine:

　　1. Environmental inspection before the experiment: Confirm that the equipment is placed in a stable, ventilated, and non strong electromagnetic interference laboratory; Check if the sealing of the high and low temperature enclosures is good, if there are no leaks in the refrigeration/heating system pipelines, and if there is sufficient heat dissipation space reserved around them.

2. Power on preheating and self-test: After connecting the main power supply, first turn on the control system for self-test to confirm that the sensors, temperature control module, displacement encoder, and force value acquisition system are alarming; Suggest starting up 30 minutes in advance to stabilize the electrical system.

3. Set test parameters: According to standards or experimental requirements, set the target temperature (such as -40 ℃ to+300 ℃), heating/cooling rate, insulation time, stretching speed, and shutdown conditions in the control software to avoid exceeding the limit and causing equipment protection shutdown.

4. Installation of samples: After the temperature chamber reaches the set temperature and is fully insulated, quickly clamp the samples to ensure that they are firmly clamped and well aligned, and to prevent overloading; When using specialized low-temperature or high-temperature fixtures, pay attention to their applicable temperature range.

5. Connect extensometer (if necessary): If measuring elongation, a temperature resistant extensometer should be selected and the corresponding channel should be enabled in the program; During installation, avoid placing force on the extensometer or interfering with the fixture.

6. Start the experiment: Confirm that the protective door is closed and the emergency stop button is reset before starting the test; During the process, monitor real-time curves and equipment status. If any abnormalities are found (such as severe vibration, odor, or overheating), the test should be immediately suspended.

7. End of experiment processing: After the test is completed, stop loading first and wait for the temperature chamber to cool naturally or heat to a safe temperature (usually 50 ℃) before opening the door to remove the sample to prevent burns or condensation from entering the equipment.

8. Cleaning and maintenance: Clean fixture residues, check the lubrication of the transmission screw, regularly calibrate force sensors, temperature sensors, and displacement systems to maintain long-term accuracy of the equipment.