Safety helmet impact resistance puncture performance standard test method

Impact resistance test method: firstly equipped with a data processing device and a force sensor, and the final record set shows the impact force numerical device. The required impact force acquisition limit is 500N, the continuous sampling time is not less than 40ms, the sampling frequency is not lower than 50kHz, and the maximum value within the sampling interval is automatically acquired and displayed. According to the helmet wearing height to choose the right head mold; in accordance with the instructions of the helmet to adjust the helmet to the normal state of use, the helmet is normally worn on the head mold, should ensure that the headband and the head mold contact is naturally worn and stable; Adjust the axis of the drop hammer to coincide with the axis of the sensor; adjust the height of the drop hammer to 1000mm ± 5mm; if using the guided drop hammer system, verify that the difference between the end-of-drop speed and the free fall speed is not more than 0.5% before testing; The helmets that were pretreated with water, high temperature, low temperature, and ultraviolet radiation were tested and the impact value was recorded to the nearest 1N.

Puncture resistance test method: When the circuit stroke closes the circuit, it can signal that the puncture cone has contacted the head mold. According to the wearing height of the helmet, select the appropriate head mold to adjust the helmet to the normal state of use according to the instructions of the helmet. Wear the helmet on the head mold normally, and ensure that the contact between the head band and the head mold is natural and stable; The axis of the penetrating cone penetrates the hardest point of the structure within 100 mm of the center diameter of the safety helmet; adjust the height of the contact point of the puncture cone to the top of the cap to be 1000 mm ± 5 mm; if using a guided drop hammer system, Verify that the end-to-end speed and the free fall speed of the 60mm height do not differ by more than 0.5%; the helmets pretreated with water, high temperature, low temperature, and ultraviolet radiation are tested in sequence to observe the damage of the power display device and the helmet. Record puncture results.

Recommend the use of testing equipment: ZM-811 helmet impact resistance puncture testing machine.

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