1Helmet rigidity testing machineInstrument usage
The helmet rigidity testing machine is used to test the impact absorption performance and puncture performance of safety helmets.
2、 Test method for helmet rigidity tester
Pre treatment: Temperature adjustment treatment: Place the safety helmet separately at 50 ℃± 2 degrees Celsius. -Place in a temperature control box at 10 ℃± 2 ℃ or -20 ℃± 2 ℃ for 3 hours.
UV irradiation pretreatment: Using the priority A method mentioned in the standard, the safety helmet is placed in the UV irradiation box and irradiated for 400 hours ± 4 hours. After removal, it is placed in the laboratory environment for 4 hours.
Immersion treatment: Place the safety helmet in a fresh water tank with a temperature of 20 ℃± 2 ℃ and soak for 3 hours.
The above pre-treatment requirements can be combined with a comprehensive pre-treatment box for safety helmets (including UV aging, high temperature box, low temperature box, constant temperature water immersion box, temperature and humidity control box)
Test method for impact absorption performance: choose a suitable head mold for the height of the safety helmet worn; Adjust the safety helmet to the normal use state according to the instructions of the safety helmet, wear the safety helmet on the head mold normally, ensure that the contact between the cap hoop and the head mold is natural and stable, adjust the axis of the falling hammer to coincide with the axis of the sensor, adjust the height of the falling hammer to 1000mm ± 5mm; test the safety helmet pretreated by water immersion, high temperature, low temperature, and ultraviolet radiation in turn. Record the impact value accurately to 1N.
Test method for puncture resistance: choose a suitable head mold for the height of the safety helmet worn; Adjust the safety helmet to its normal usage state according to the instructions. Wear the safety helmet on the head mold normally, ensuring that the contact between the helmet hoop and the head mold is natural and stable. Adjust the axis of the puncture cone to pass through the weak point of the structure within a diameter range of 100mm from the center of the safety helmet top. Adjust the height of the puncture cone tip to the contact point of the helmet top to 1000mm ± 5mm. Test the safety helmet that has been pre treated with immersion, high temperature, low temperature, and ultraviolet radiation in sequence, observe the damage of the power on display device and the safety helmet, and record the puncture results.
IIIHelmet rigidity testing machineMain technical parameters
1. Head mold: * Complies with the provisions of Appendix A of GB/T 2812-2006 "Test Methods for Safety Hats" standard.
2. Bench: capable of controlling the lifting, suspension, and release of impact hammers and puncture hammers.
3. Drop hammer: Impact drop hammer: The mass is 5-5.01kg, the hammer head is hemispherical, with a diameter of 96mm, and the material is 45 # steel.
Puncture hammer: with a mass of 3-3.05kg, the puncture part has a cone angle of 60 °, a cone tip diameter of 1mm, a length of 40mm, a large diameter of 28mm, and a hardness of HRC45. The impact force * after the installation of two falling hammers meets the standard.
4. Force sensor: measuring range 0-20KN, frequency corresponding to 5kHz less, dynamic force sensor, accurate to 1N.
5. Base: It has impact resistance and can firmly install force sensors.
6. Power on display device: When the circuit forms a closed loop, it can emit a signal indicating that the puncture cone has contacted the head mold.
7. Hammer height: 1000mm.
8. 1 # and 2 # aluminum silicon alloy test head molds each. Complies with the provisions of Appendix A of GB/T 2812-2006.
9. Working power supply: AC220V, 50Hz
4、 Characteristics of helmet rigidity testing machine instrument
1. The replacement method of falling hammer and impact hammer is easy to operate.
2. Equipped with an automatic guidance system to ensure that the impact hammer and drop hammer accurately and precisely hit the safety helmet.
3. Electric lifting has a photoelectric positioning device, automatic positioning, and reliability.
4. The helmet rigidity testing machine has a professional high-precision sensor for impact force, with a range of 2t and an accuracy of ± 0.02%.
5. LED digital display, automatically saving the maximum power value.