Common faults and solutions of plastic high-temperature tensile testing machine

During long-term operation, plastic high-temperature tensile testing machines are prone to various malfunctions due to high temperature environments and frequent operations. Timely identification and proper handling are key to ensuring testing accuracy and equipment safety.

1、 Abnormal temperature: unable to reach the set value or experiencing excessive fluctuations

This is a common malfunction. The reasons include: slow heating due to aging of heating elements, cold and hot leakage caused by damaged sealing strips, and temperature sensor drift leading to inaccurate temperature control.

Solution: Check the status of the heating tube and clean the dust from the condenser. Observe whether the sealing strip is deformed or cracked, and replace it in a timely manner. Use a standard thermometer to calibrate the actual temperature inside the box, and recalibrate the sensor if necessary. Avoid placing too many samples at once to avoid increasing the heating load.

2、 Force value display jumps or data is inaccurate

Manifested as shaking of force values, inability to reset to zero, or significant measurement deviation. The main reasons are sensor overload, loose connecting wires, uncalibrated extensometers, or transmission jamming caused by lubrication failure at high temperatures.

Solution: Zero the load and check the sensor wiring. Regularly calibrate the force value with standard weights, and if the deviation exceeds ± 0.5%, professional handling is required. Use high-temperature resistant lubricating grease for high-temperature areas. It is essential to complete force and displacement calibration before each experiment.

3、 Sample clamping slips or breaks inside the fixture

The sample slips and interrupts the test, or frequently breaks at the fixture mouth. The main reasons are surface wear and oil stains on the fixture, insufficient pneumatic fixture pressure (should be ≥ 0.5MPa), or uneven tightening of manual fixtures.

Solution: Clean the clamping surface of the fixture and replace the toothed clamping block. Check the air supply pipeline for any leaks and ensure that the pressure meets the standard. Manual fixtures ensure consistent tightening force on both sides. If it frequently breaks at the fixture, it indicates that the clamping is too tight causing stress concentration and needs to be adjusted appropriately.

4、 The crossbeam is stuck or making abnormal noises during operation

Lack of oil in transmission components, debris getting stuck in the screw guide rail, or loose couplings or belt slippage can all cause this.

Solution: Stop the machine and clean the foreign objects in the transmission components, and add special lubricating grease. If the belt is loose, adjust the tension of the motor fixing screw. If the deformation is severe, replace it. Contact professional personnel for maintenance of internal abnormal response of the motor.

5、 Software communication interruption or control failure

The computer and the testing machine cannot communicate, data is lost, or buttons are unresponsive. Mostly due to loose connection cables, abnormal drivers, firewall interception, or system incompatibility.

Solution: Check the USB or Ethernet connection and restart the device. Confirm software version matching, close firewall or add port whitelist. Stay away from strong electromagnetic environments in daily life and make good data backups.

Daily maintenance is fundamental to prevention: clean the chamber after each test, lubricate the guide rail monthly, and check the electrical circuit quarterly. Establishing equipment archives to record maintenance cycles and predicting the lifespan of vulnerable parts in advance can effectively reduce the risk of sudden downtime.