DR - Drum Speed Measuring Machine

It can simulate the dynamic durability of a scooter during road conditions. By using dual rollers for drive, it tests the fatigue life of the scooter's wheel hubs, body structure and overall performance. It is often used for life detection of related products such as electric scooters. 

Main technical parameters

Core Technology Principles and Test Logic

✅ Dual Drum Drive: All-terrain Simulation, Replicating Real Movement Scenarios

The equipment adopts a dual drum coordinated drive system (main drum + driven drum), which achieves full-scenario coverage from smooth roads to bumpy mountain roads through "drum surface texture switching + dynamic speed/load adjustment":

✦ Multi-terrain Texture Adaptation:

The drum surface supports 4 interchangeable texture modules (smooth asphalt texture, bumpy gravel texture, speed bump texture, and slippery tile texture), simulating the force conditions of the electric scooter in typical scenarios such as "urban commuting (smooth road)", "outdoor riding (gravel road)", "residential area navigation (speed bumps)", and "rainy day slippery road (tile road)".

Texture depth 0–10mm (adjustable), accurately reproducing different degrees of road undulations such as "5mm small bumps" and "10mm large stones" (traditional single drum can only simulate smooth road conditions). 

Dynamic Load and Speed Control:

Load range: 50–150kg (adjustable), simulating real load scenarios such as "single rider (75kg)" and "double riders stacked (150kg)";

Drive speed: 5–40km/h (adjustable), covering riding states such as "low-speed gliding (5km/h)", "conventional commuting (20km/h)", and "high-speed sprinting (40km/h)";

Supports "emergency braking simulation" (decelerating from 40km/h to 0 within 0.5 seconds), to verify the "braking wear resistance" of the hub and the "impact resistance" of the frame (for example, no cracks in the hub after 1000 emergency braking cycles, and no deformation in the frame). 

✅ Comprehensive Performance Monitoring: Hub - Frame - Overall, Multi-Indicator Synchronous Tracking. The device integrates a strain gauge stress sensor, an infrared thermometer, and a vibration analyzer. Through the "three-module collaborative collection", it can monitor the all-round attenuation of the "fatigue - wear - performance" of the electric scooter in real time:

✦ Hub Durability Monitoring:

A strain gauge stress sensor (accuracy ±0.1%FS) is built into the hub shaft end to collect the stress changes during the "rolling - braking" process in real time (for example, the hub bears a radial force of 500N during high-speed riding and an impact force of 800N during emergency braking).

A laser thickness gauge (accuracy ±0.01mm) is provided to automatically measure the wear of the hub tire surface every 5000 cycles (for example, a high-quality hub has a wear of ≤0.5mm after 100,000 kilometers, while a low-quality hub has a wear of >2mm). 

✦ Body structure strength monitoring:

Piezoelectric vibration sensors (frequency response 0.1–10kHz) are attached to key parts of the frame (top tube, pedal, folding joint) to capture high-frequency vibrations on bumpy roads (for example, when riding on a 10mm bumpy road, the frame vibration frequency can reach 50Hz).

The system automatically generates a "vibration-frequency curve". When the vibration is abnormally amplified (for instance, the vibration amplitude of a certain batch of frames suddenly increases by 30% after 20,000 kilometers), it triggers a "structural fatigue warning" (indicating "insufficient material toughness of the frame"). 

Overall performance degradation analysis:

Equipped with an infrared thermometer (accuracy ±1℃), it can monitor the temperature rise of the wheel hub bearings and the motor (if it is an electric scooter) in real time (for example, the bearing temperature during high-speed riding should be ≤60℃, and if it exceeds the temperature, it will prompt "poor lubrication");

Supports "power performance tracking" (for electric scooters), simulating the uphill scene through "drum resistance loading", and testing the "motor power attenuation rate" (for example, if the motor power drops by ≤5% after 100,000 kilometers, it is qualified). 

✅ 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 speed (km/h), cumulative mileage (km), hub stress (N), vehicle body vibration (Hz), bearing temperature (℃)". 

Support "abnormal alarm" (such as speed exceeding 40 km/h, hub temperature exceeding 80℃), automatically shut down within 0.3 seconds and display fault code (such as "E03: Hub Overheating"). 

✦ One-click generation of compliance reports:

Built-in ISO 7176/EN 17128 standard templates automatically match thresholds such as "hub wear within 100,000 kilometers ≤ 1mm" and "frame vibration amplitude ≤ 0.5g", outputting a "pass/fail" determination and marking problem points (such as "hub wear exceeds standard");

Reports can be exported to a USB drive or the cloud (formats: PDF/Excel), including "test parameter table, stress curve, vibration spectrum, compliance conclusion", and can be directly used in scenarios such as "CE certification" and "3C certification" (traditional manual report preparation takes more than 6 hours). 

Application scenarios and customer value

Scooter manufacturer: 70% improvement in production line quality control efficiency

✦ Production line compatibility:

Seamlessly integrated with the "assembly - quality inspection" stage of the scooter production line, capable of testing 5-8 scooters per day per unit (based on an 8-hour workday), meeting the production demand of "200 units per month" on a large scale;

The pass rate has increased from 85% (random road tests) to 99%, saving 400,000 yuan in annual after-sales maintenance costs (based on an annual production of 2,400 units). 

2. Third-party Testing Institutions: The "Golden Certificate" of Authoritative Certification

✦ Compliance Support:

The equipment has been certified by the CNAS laboratory (China National Accreditation Service for Conformity Assessment), and the test reports are directly recognized by international standards such as ISO and EN;

It once helped a testing institution issue a test report for "electric scooters exported to Europe", avoiding a loss of 3 million yuan due to the return of goods caused by "hub fatigue fracture". 

3. R&D Enterprises: The "Accelerating Engine" of Technological Iteration

✦ Research and Development Support:

Simultaneously test the durability of different hub materials (such as aluminum alloy vs. carbon fiber) and different frame structures (foldable vs. one-piece);

Output correlation reports on "material-life" and "structure-vibration" (e.g., "The lifespan of carbon fiber hubs is twice as long as that of aluminum alloy"), assisting R&D teams in optimizing designs (traditional road tests take 6 months, reducing the time by 80%). 

Reliability and Design Details

Structural Durability:

✦ The dual rollers are made of 42CrMo alloy steel with surface quenching (hardness HRC55–60), offering a wear-resistant lifespan of ≥2 million kilometers;

✦ The servo drive system has a lifespan of ≥100,000 hours (equivalent to continuous testing for 11 years, with an average of 8 hours of testing per day).

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 160kg), and a "protective fence" (preventing the skateboard from derailing and flying), meeting the ISO 13849 mechanical safety standard;

✦ The test chamber is made of fire-resistant sheet metal with an insulating coating (temperature resistance ≥500℃), avoiding the risk of "fire caused by hub friction overheating" (suitable for high-temperature laboratory environments).

Operation Process (4-step Efficient Testing)

✦ Installation and Fixation → Secure the skateboard to be tested on the test stand (simulating the real riding posture), and select the matching roller texture (such as "gravel bump texture");

✦ Parameter Setting → Input "target load (e.g., 100kg)", "test speed (25km/h)", and "target mileage (50,000km)", and the system automatically matches the ISO/EN standard threshold;

✦ Start Testing → Click the "start" button, and the equipment automatically completes the entire process of "load loading - dual roller driving - data collection" (real-time data can be viewed during the process);

✦ Result Output → After the test is completed, the screen displays the "pass/fail" determination, and the report (including wear imaging and stress curves) can be exported to a USB drive (cloud platform synchronization is optional). 

Double-roller simulation, full-dimensional lifespan testing - with laboratory-level precision, we stamp each electric scooter with a "seal of reliable quality" for its "dynamic durability".