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The helmet impact tester is mainly used to detect the impact absorption performance and puncture resistance performance of the helmet, and the detected data is used to determine whether the impact absorption and durability of the helmet are qualified.
Second, helmet crash test machine operation precautions:
1, the operator should first read the manual of the helmet impact tester, be familiar with the basic performance and operation of the instrument;
2. Before the instrument is opened, always check whether there is a good grounding wire to avoid danger;
3, in the entire operation of the experiment in order to test personnel safety must bring labor insurance gloves;
4. After turning on the power switch of the instrument, it is necessary to warm up for ten minutes;
5. When the puncture hammer is in direct contact with the head mold, it will produce a sound due to the circuit closed circuit device, so it should be isolated when not in use;
6, this device uses a highly sensitive sensor, the test head should be gently with the sensor contact, to avoid damage to the sensor and the prestress, reduce the test error rate; severely hit the head model without a helmet And damage the sensor;
7. Be sure to turn off the power switch when exchanging the head mold;
8. Always turn off the power switch after the operation is completed.
Third, the helmet crash test machine before the test preparation:
1. Prepare helmet samples for testing and test instruments for pretreatment testing;
2. Perform preconditioning tests such as thermostat treatment, UV irradiation pretreatment, and immersion treatment on the test helmet.
Temperature regulation pretreatment: using hard hat high temperature pretreatment box, hard hat low temperature pretreatment box, place helmet in 50°C±2°C,-10°C±2°C or -20°C±2°C temperature adjustment box 3h;
Ultraviolet irradiation pretreatment: using the helmet UV aging box using the standard "GBT2812-2006 helmet test method" mentioned in the priority UV irradiation A method, the helmet in the ultraviolet irradiation box irradiation 400h ± 4h, after removal in the experiment Place 4h in room environment;
Immersion treatment: The helmet is placed in a fresh water bath at a temperature of 20°C ± 2°C and completely soaked for 3 hours with a helmet water immersion tester;
3, according to the vertical distance between the helmet to wear height measuring instrument to choose the right head model.
4, ready to record test results with a form.
Fourth, helmets impact testing machine instructions:
Hard hat impact absorption performance test:
1. Wear the pre-treated helmet sample correctly on the head mold to ensure that the gap between the headband and head mold is minimal and stable. Adjust the drop hammer axis coincides with the axis of the sensor, adjust the height of the drop hammer (1000 ± 5) mrn;
2. Close the door of the test box to ensure that the impact drop will not endanger the safety of the test personnel;
3. Press the “Clear†button on the operation function panel to clear the system zero force value.
4. Put the upper plane of the drop hammer into line with the lower plane of the electromagnetic device. Press the “Sucking†button on the operation panel. At this time, the electromagnetic suction device works, and the drop hammer is pulled by the electromagnetic device.
5. When the above work is completed, press the “Release†button on the operation panel. At this time, the electromagnetic suction device stops working. The impact hammer quickly and freely falls down on the top center position of the helmet, and at the same time, the maximum value of the impact value is displayed and latched. ;
6. Record the value of the helmet's impact on the LED display and check whether the cap shell has fallen off. This value is the maximum value within the sampling interval specified in the standard;
7. Once the experiment is completed, remove the drop hammer and safety helmet. If you want to continue the test and follow the above steps, press the “Clear†button of the operation function panel before each retest to record the new test data.
　 Safety helmet puncture resistance test test:
1. Wear the pre-treated helmet sample correctly on the head mold to ensure that the gap between the headband and head mold is minimal and stable. Adjust the axis of the puncture hammer coincides with the axis of the sensor, adjust the height of the puncture hammer to (1000 ± 5) mrn;
2. Close the door of the test chamber to ensure that the drop of the puncture hammer does not endanger the safety of the test personnel;
3, the puncture of the upper plane and the electromagnetic device is placed in the lower plane, press the function panel "pull" button, then the electromagnetic suction device work, the puncture hammer is sucked by the electromagnetic device;
4, the above work is completed, press the "release" button on the operation panel, then the electromagnetic suction device stops working, the puncture hammer quickly and freely fall in the center of the hard hat at the top of the weakest position;
5. Whether the safety helmet is penetrated by the puncture hammer, whether the alarm device emits a drop alarm sound, and whether the indicator lamp on the operation function panel is lit;
6. Once the experiment is completed, remove the puncture hammer and safety helmet. If you need to continue the test, follow the above steps.
Fifth, determine whether the helmet is qualified
The judgment of the impact absorption performance of the helmet: When the recorded force value is displayed between 500N-4900N and the helmet cap shell is not fragmented, the helmet is qualified as the helmet; otherwise, the helmet is not qualified.
The judgment of the puncture-resistant performance of the helmet: When the alarm does not issue an alarm sound, the indicator light on the operation panel is not lit and the helmet cap shell has no fragments and the helmet is qualified as the helmet; otherwise, the helmet is unqualified.
Sixth, helmets impact testing machine maintenance
1. The instrument and equipment management personnel must be familiar with the performance of the instruments and equipment they are managing, as well as the operating procedures, improve the equipment technical files, and properly keep the equipment's technical data and instructions;
2. Ensure the completeness of equipment, equipment and accessories, and do a good job of daily maintenance and maintenance;
3, keep the instrument clean;
4. When not in use, keep the sensor, head mold, and drop hammer puncture hammer in particular to avoid being pressed by heavy objects;
5. If there is an abnormality in the helmet impact tester, do not deal with it by yourself. You can consult our company by telephone and carry out renovations under the guidance of our professional staff.
Hard hat impact tester operating instructions Zhongbang
First, helmet crash test machine test purposes: