DR - Pulley Straight Line Endurance Testing Machine

The chair is simulated to move forward and backward under load to maintain the continuous force of the chair and test the fatigue stress resistance and wear resistance of the chair wheels.

Compliance standards: ANSI, SGS, CNS-3089

Test items

1) Dynamic test: The rotation direction of the roller can be set to forward or reverse, and the forward and reverse dwell times can be set. Up to ten consecutive change processes can be set, and the total process can be cycled up to 9999 times.

2) Long-distance walking test: The running time and mileage can be set. The machine stops when the preset time and mileage are reached.

3) Static load test: The equipment is equipped with a 3-ton hydraulic cylinder to apply load when the roller stops.

4) Wheel anti-explosion test: There is a photoelectric switch at the wheel installation position to detect whether it is broken or damaged. The machine stops when damage is detected.

5) Simulated bump test: Obstacle blocks are added to the roller to simulate the bumps when the wheels pass over obstacles. 

Main technical parameters

Core Technology Principles and Test Logic

✅ Real-scenario Simulation: Load/Frequency/Stroke, Full-dimensional Replication of Usage Conditions

The equipment adopts a servo drive system and load application device, and through "three-parameter precise control", it reproduces the force and motion state of the chair wheels during actual use:

✦ Load Constancy Control:

Maximum load 100–300kg (adjustable), simulating scenarios such as "adult sitting posture (75kg)", "double occupancy (150kg)", and "full load of the equipment (300kg)";

It uses pneumatic/hydraulic dual-mode loading (optional), with load fluctuation ≤±2% (traditional manual adjustment of weight blocks has a deviation >10%), ensuring the accuracy of fatigue tests under a "continuous pressure" state (for example, under a 300kg load, the chair wheel bearing withstands 0.5MPa pressure each time it moves). 

✦ Adjustable moving frequency and stroke:

The forward and backward moving frequency is 1–3 times per minute (adjustable), covering daily scenarios such as "slowly pushing the chair (1 time per minute)" and "high-frequency sliding (3 times per minute)";

The moving stroke is 200–800mm (adjustable), simulating usage habits such as "short-distance displacement (200mm)" and "long-distance sliding (800mm)" (such as the typical distance an office chair slides from the desk to the filing cabinet);

Supports "emergency stop simulation" (sudden stop within 0.5 seconds during movement), to verify the "instant braking wear resistance" of the chair wheels (such as the anti-tear ability of the rubber on the wheel surface during emergency stops). 

✦ Track surface adaptation:

The test track adopts a multi-material replaceable design (such as composite flooring, tiles, marble, carpet, etc.) to simulate the wear differences under various ground conditions (for example, the friction coefficient of the carpet surface is high, and the wear rate of the chair wheels is 30% faster than that on tiles);

The track surface is preset with a "0–5° incline angle" (adjustable) to verify the load-bearing stability of the wheel body in the "slope push-pull" scenario (such as the sliding reliability of medical chairs on the slopes of hospital wards). 

✅ Multi-dimensional data collection: Fatigue stress + wear amount, real-time tracking of performance degradation. Equipment integration: Stress sensor + laser thickness gauge + high-speed camera, through "three-module collaborative monitoring" to achieve dual-dimensional analysis of chair wheel "fatigue - wear":

✦ Fatigue stress monitoring:

The chair wheel bracket is equipped with a strain-type stress sensor (accuracy ±0.1%FS), which collects stress changes during the "move - stop" process in real time (such as the bracket bearing 500N tensile force during each movement and 300N pressure when stopped);

The system automatically generates a "stress - number of times curve", and when there is an abnormal stress fluctuation (such as a sudden increase of 20% in stress for a certain batch of brackets after 1000 times), it triggers a "fatigue warning" (indicating "insufficient toughness of the bracket material"). 

✦ Precise measurement of wear:

Equipped with a laser thickness gauge (accuracy ±0.01mm), it automatically scans the wheel surface every 500 movements to calculate the "wheel diameter reduction" (for example, high-quality wheel bodies have a wear of ≤0.2mm after 10,000 movements, while low-quality ones have a wear of >1mm);

Supports "three-dimensional wear imaging" (generating a wear distribution map of the wheel surface through point cloud scanning), visually displaying the wear differences in the "rim/center/bearing position" (assisting in locating design defects). 

Dynamic process recording:

A 4K high-speed camera (with a frame rate of 240fps) records the entire process of "wheel rotation - ground contact - emergency stop and friction" in real time. It supports "slow-motion playback" (at 0.1x speed), capturing subtle anomalies such as "micro-cracks on the wheel surface" and "bearing jamming" (which are only identifiable by the naked eye when they are larger than 0.5mm). 

✅ Intelligent Data Management: From testing to reporting, the entire process is traceable.

✦ Real-time parameter visualization:

Equipped with a 10-inch industrial touch screen (resolution 1920×1080), it synchronously displays core parameters such as "current load (kg), movement frequency (times/minute), cumulative times, wheel diameter wear (mm), stress peak (N)", etc.

Supports "abnormal alarm" (such as load exceeding 300kg, wear exceeding 1mm), automatically stops within 0.3 seconds and displays the fault code (such as "E02: Excessive wear"). 

✦ One-click generation of compliance reports:

Built-in ANSI/SGS/CNS-3089 standard thresholds (such as "wheel diameter wear ≤ 0.5mm after 10,000 movements" and "stress fluctuation ≤ 10%"), automatically determine "pass/fail" and mark problem points (such as "excessive wheel surface wear");

Reports can be exported to a USB drive (formats: PDF/Excel), including "test parameter table, stress curve, wear imaging diagram, compliance conclusion", and can be directly used in scenarios such as "ISO 9001 certification" and "export customs clearance" (traditional manual report preparation takes more than 4 hours). 

Application scenarios and customer value

1.Chair manufacturer: 60% increase in production line quality control efficiency

✦ Production line compatibility:

Seamlessly integrated with the "assembly - quality inspection" stage of the chair production line, capable of testing 10-15 sets of chair wheels (4 wheels per set) per day per machine, meeting the production demand of "500 sets per month" on a large scale;

The pass rate has increased from 80% (manual spot checks) to 98%, saving 200,000 yuan in annual after-sales replacement costs (calculated based on 6,000 sets per year). 

2. Exporting Enterprises: The "Green Pass" of International Certification

✦ Compliance Support:

The equipment has been calibrated by the SGS laboratory (Certification Number: SGS-2025-TEST-001), and the test report is directly recognized by standards such as ANSI and CNS-3089;

It once helped an office chair enterprise pass the "American ANSI BIFMA X5.1 Certification", avoiding a loss of 2 million yuan due to the chair wheels' failure to meet durability standards and the subsequent return of the order. 

3. R&D Institution: The "Accelerator Engine" for Material Optimization

✦ Research Support:

Simultaneously test the wear resistance of different wheel materials (such as nylon vs. polyurethane) and different bearing types (ball bearings vs. sliding bearings);

Output correlation reports on "material-wear rate" and "bearing-stress fluctuation" (e.g., "The wear rate of polyurethane wheels is 40% lower than that of nylon"), assisting the R&D team in optimizing formulas (reducing the traditional 3-month road test to 30% of the original time). 

Reliability and Maintenance

Structural Durability:

✦ The servo drive system has a lifespan of ≥500,000 cycles (equivalent to continuous testing for 5 years, with an average of 1,000 tests per day);

✦ The surface of the test track is coated with tungsten carbide (hardness HV1500), with a wear-resistant lifespan of ≥2,000,000 movements.

Operational Safety:

✦ The equipment is equipped with an "emergency stop button" (power off within 0.1 seconds), "overload protection" (automatically unloads when the load exceeds 330kg), and "protective guard" (prevents wheel detachment and splashing), meeting the ISO 13849 mechanical safety standard;

✦ The test chamber is treated with anti-static powder coating (surface resistance ≤10^9Ω), suitable for anti-static scenarios such as "electronic factories, laboratories".

Operation Process (4-step efficient testing)

✦ Installation and Debugging → Secure the chair wheels to be tested on the test stand (simulating the real chair connection method), and select the matching test track material (such as laminate flooring);

✦ Parameter Setting → Input "target load (e.g., 150kg)", "movement frequency (2 times/minute)", and "test cycles (10,000 times)", and the system automatically matches the ANSI/SGS/CNS-3089 standard threshold;

✦ Start Testing → Click the "Start" button, and the equipment automatically completes the entire process of "loading the load - cyclic movement - data collection" (the process can be paused at any time to view real-time data);

✦ Result Output → After the test is completed, the screen displays a "pass/fail" determination, and the report (including wear imaging and stress curves) can be exported to a USB drive, with data automatically stored in the local database. 

Precision tracking · Fatigue tracking - With the rigor of international standards, we stamp every set of chair wheels with a "reliable quality seal" for their "anti-wear and tear performance".