Experimental methods:
1. Preprocessing: temperature adjustment, the safety cap is placed at 50. 2 degrees centigrade respectively. For 3 hours at -10℃±2℃ or -20℃±2℃.
2. Ultraviolet radiation pretreatment: the priority A method is used in the standard, the helmet is placed in the ultraviolet irradiation box for 400h±4h, and then removed for 4 hours in the laboratory environment.
3. Soaking treatment: the safety cap is placed in a fresh self - water tank with a temperature of 20. 2 C and completely soaked in 3h.The above pretreatment requirements can be combined with GX-7005 safety helmet comprehensive pretreatment box (including ultraviolet aging, high temperature box, low temperature box, constant temperature water immersion box, temperature regulation and humidity control box).
4. Test method of impact absorption performance: the height of the helmet is high and the appropriate head die is selected; adjust the helmet to normal use according to the instructions of the helmet; wear the helmet on the head mold normally, the contact between the cap and the head die is naturally worn and stable, the axes of sensor axis adjustment with the hammer, the hammer to adjust the height of 1000mm + 5mm; if you use a hammer system with guidance, should verify the 60mm height at the end of the speed difference and free fall final speed of not more than 0.5% before the test; in order to test the water, high temperature, low temperature, ultraviolet irradiation pretreatment safety helmet. Record the impact value to 1N.
Test method of resistance to puncture performance: the height of the helmet is high and the appropriate head die is selected; adjust the helmet to normal use according to the instructions of the helmet; wear the helmet on the head mold normally; the contact between the cap and the head die is naturally worn and stable; the cone axis adjustment puncture through the helmet cap center within 100mm diameter structure of the weakest point; adjust the puncture tip to the contact point of the crown height of 1000mm ± 5mm; if a drop - hammer system with a guide is used, before testing, it is necessary to verify that the difference between the 60mm height and the free falling speed is not more than 0.5%. In order to test the safety helmet pretreated by immersion, high temperature, low temperature and ultraviolet radiation, we observed the destruction of the electrified display device and the safety helmet, and recorded the puncture results.
Conform to the standard:
GB/T 28122006 "helmet" test method in the shock absorbing performance and puncture resistance test requirements
GB/T 28112007 "hat"
1.The drop hammer and the impact hammer replacement operation is simple.
2. It has an automatic guidance system to ensure that the impact hammer and the drop hammer are accurately and accurately landed on the safety helmet.
3. Electric lifting has photoelectric positioning device, automatic positioning, accurate and reliable.
4. The high precision sensor of the impact force is 2t and the precision is 0.02%.
5. LED digital display, automatically save the maximum force value.
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