Manual and powered wheelchairs repeatedly cross floor joints, thresholds, ramps and uneven surfaces while the frame, wheels, brakes, armrests and seating connections are subjected to cyclic load. Double-roller fatigue and stability equipment reproduces these conditions in a controlled laboratory environment to evaluate durability, structural integrity and failure risk. Test planning may reference GB 12996, GB/T 18029 series and the applicable wheelchair specification.

1. Purpose of Double-Roller Fatigue Testing

The machine uses front and rear roller assemblies to drive the wheelchair wheels continuously. Raised impact blocks on the roller surface simulate repeated travel over uneven ground. One roller group should be adjustable to match different wheelbases, and lateral restraint should prevent sample escape without restricting normal wheel or suspension movement. Typical systems operate at approximately 1.0 m/s with roller and impact-block dimensions selected according to the applicable test method.

2. Main Equipment Modules

• Front and rear motor-driven rollers with variable-speed control;
• Wheelbase adjustment mechanism using a lead screw or guide system;
• Sample restraint and side-protection system;
• Test dummy or load arrangement for the seat, backrest and footrest;
• PLC and HMI for speed, cycles, stage inspection and alarms;
• Safety enclosure, emergency stop, door interlock and sample-release detection.

3. Stability and Related Test Items

Double-roller testing evaluates long-term durability, but a complete laboratory may also include static strength, dynamic stability, brake fatigue, drop, pendulum impact, armrest loading and obstacle-crossing tests. Dynamic stability evaluates tipping risk during starting, stopping or turning on a slope. Brake fatigue verifies repeated operating reliability. Drop and impact tests help identify structural weakness in the frame and connection points.

4. Operating Procedure

1. Inspect tires, wheels, brakes and the frame and record the initial condition;
2. Adjust the roller spacing to the wheelchair wheelbase and align the wheels;
3. Install the specified dummy or load and adjust lateral restraints;
4. Run at low speed to verify smooth travel and impact-block engagement;
5. Set speed, cycle count and stage-inspection points and start the endurance test;
6. Inspect fasteners, welds, tires, brake function and deformation at planned intervals;
7. Perform final functional checks and document all failure locations.

5. Data and Acceptance Review

Records should include speed, accumulated distance or cycles, load, abnormal stops and inspection findings. Critical areas include frame welds, axles, rims, footrests, armrests, backrest and brake mechanisms. Powered wheelchairs also require inspection of motors, controllers, battery retention and wiring. When a failure occurs, the cycle stage and operating condition should be retained for design analysis.

6. Equipment Selection

The machine should cover the maximum wheelchair width, wheelbase and test load. Roller width, guard clearance and adjustment range require sufficient margin. Multi-model laboratories benefit from powered wheelbase adjustment, recipe management and automatic inspection reminders. Universal loading frames and interchangeable fixtures can support both wheelchair and rehabilitation-device projects.

7. Maintenance

Roller surfaces, impact-block dimensions, bearings, transmission components, speed sensors and restraint devices require periodic inspection. Dummies and calibration weights should have identification and verification records. Emergency stops and door interlocks must be checked before each test. LSKFT can configure double-roller fatigue, stability, brake fatigue, drop, impact and obstacle-crossing systems according to sample dimensions and laboratory space.