Local Temperature Indicator,Explosion-Proof Temperature Transducer,Temperature Monitoring Sensor,Temperature Sensing Device Jiangsu Pinpai Technology Co., Ltd. , https://www.jspingpa.com
I know many people have questions about the changes in the new standard for helmet impact testing machines. Below is a detailed explanation of the system and how it improves accuracy and safety.
1. **Headform**: The new standard now uses an aluminum-magnesium alloy headform, which is cast and pressed to meet the requirements in Appendix A of the standard. Previously, wooden headforms were used, but wood can degrade over time, leading to inconsistent buffering effects during impact tests. This could result in inaccurate readings and large variations in test results. The new alloy headform eliminates this issue, ensuring more reliable and consistent data.
2. **Gantry System**: The gantry allows the impact hammer to be lifted and released accurately. It can adjust the drop height based on the helmet’s design, up to 1.1 meters, which exceeds the standard requirement of 1 meter. This flexibility ensures that different helmet models are tested under the correct conditions, improving overall test reliability.
3. **Drop Hammer**: The impact hammer weighs between 5–5.01 kg, with a hemispherical shape measuring 96 mm in diameter, made from 45# steel. The puncture cone has a 60° angle, a tip diameter of 1 mm, and a total length of 40 mm. Some domestic manufacturers faced issues where the cone rotated during release, causing inaccuracies. We solved this by adjusting the center weight of the cone, ensuring precise positioning and accurate energy transfer during the test.
4. **Force Sensor**: The new standard requires a dynamic force sensor with a range of 0–20 kN and a frequency of at least 5 kHz, with an accuracy of ±0.02%. Many domestic manufacturers still use static sensors, which are less effective at capturing peak forces. AQSIQ updated the standard to ensure more accurate data collection. Our system uses advanced dynamic sensors, supported by a custom-designed acquisition board to prevent crashes or damage, ensuring stable and reliable performance.
5. **Base Design**: The base must support the load cell effectively. While the old standard required a concrete base, we found this impractical in real lab settings. Concrete casting can damage existing infrastructure and is difficult to remove. Our team developed a new fixed base that prevents resonance and vibration, ensuring stability and accuracy in every test.
6. **Power Display Device**: Once the puncture cone makes contact with the headform, the system sends a signal, indicating the start of the impact phase.
7. **Pretreatment Process**: The new standard includes more realistic pretreatment methods. For example, helmets are exposed to UV light, low temperatures, high temperatures, and water soaking before testing. These steps simulate real-world conditions, ensuring that helmets remain safe even after long-term exposure. This reflects the AQSIQ's commitment to worker safety and highlights the importance of thorough testing before products reach the market.
Overall, these improvements make the new testing machine more accurate, reliable, and aligned with real-world scenarios, providing better protection for workers who rely on safety helmets every day.