Refrigerators, washing machines and microwave ovens use different door structures, but all depend on hinges, locks, switches, seals and safety interlocks. Repeated operation can cause sagging, wear, incomplete closing and signal failure. A universal door endurance tester uses interchangeable fixtures and programmable motion to evaluate long-term reliability.

1. Product-Specific Focus

• Refrigerators: hinges, seals, self-closing and light switches;
• Washing machines: locks, feedback signals, unlock delay and hook durability;
• Microwave ovens: interlock sequence, hook wear and closing impact.

2. Equipment and Motion Control

The machine includes an adjustable frame, actuator, door fixture, position sensor, lock-signal acquisition, PLC and HMI. Servo actuation provides controlled angle, speed and closing impact.

3. Test Procedure

1. Record initial gaps, forces and interlock signals;
2. Align the actuator with the normal user motion path;
3. Set angle, speed, dwell and cycle count;
4. Configure lock, light and controller feedback inputs;
5. Run trial cycles and then formal endurance testing;
6. Inspect sag, gaps, force, signals, hinges and seals.

4. Failure and Safety

The system should record incomplete closing, missing feedback, incorrect interlock sequence, timeout and overload. Pinch protection, sample restraint and emergency stop are required. LSKFT can configure universal frames and product-specific fixtures.