New Standard for Hard Hat Impact Tester

I believe that everyone has some doubts about the change of the new standard of the helmet impact test machine. The following is a brief introduction of the system for you.

1. Head mold: According to the standard requirements, the whole aluminum-magnesium alloy is used to cast and press. It fully meets the requirements of the standard appendix A. The head mold material required by the old standard is wood, because the wood head mold is soft and the wood will migrate through time. The nature of the change will have different buffering effects on the impact force. Therefore, in this test, the beech head mold may directly lead to inaccurate test results, and the deviation of the test results of the same batch sample may be too large. Consequences: Now that the new national standard has been cast entirely from aluminum-magnesium alloy, it is completely effective in avoiding the occurrence of buffering effects. Therefore, we have stringent requirements for the production process of headforms and strive for more accurate results.

2, gantry: to be able to hang and release the impact of falling hammer, puncture drop hammer can be set according to the height of the helmet, the height of the impact helmet can be randomly set up to up to 1.1 meters high standard requirements of the impact height of 1 meter, because different manufacturers Safety helmets may cause different heights of the vertical spacing of the helmets, resulting in different impact heights. According to the standard requirements, we have specially set the system to be adjusted freely, depending on the height of your helmet.

3, drop hammer: impact hammer: quality 5-5.01kg hammer hammer is hemispherical diameter 96mm, material is 45 # steel. Puncture cone: The mass is 3—3.05kg, the puncture part cone angle is 60°, cone tip diameter 1mm, length 40mm, maximum diameter 28mm, hardness HRC45. The common problem of puncturing the drop hammer in some domestic manufacturers is that the puncture cone automatically rotates after being released, causing the cone tip to fail to accurately reach the effective position of the helmet, causing the test to be inaccurate, and impairing the impact energy. After the investigation and trials, the problem was solved completely. By solving the center point weight of the puncture cone during production, according to the standard weight requirements, we performed a special weight at the center point of the puncture cone to ensure that the puncture cone was 100%. The safety of the helmet to the effective part of the helmet allows the test to be more accurate and allows our people to feel more comfortable after wearing a safety helmet.

4, the standard requirements of the force sensor: measuring range 0-20KN frequency corresponding to the minimum 5kHz, dynamic force sensor accuracy to 1N accuracy ± 0.02%. Nowadays, many domestic manufacturers do not use dynamic force sensors. Most of them use static force sensors. This indicator is also one of the most important indexes after the national standard is updated. Why do we use dynamic force sensors? AQSIQ considers static The collection frequency of the force sensor is too low. After the heavy hammer reaches the helmet, the maximum force point cannot be collected. The collected value may have a large deviation. Therefore, the AQSIQ has studied and studied in the new standard. The bold use of the dynamic force sensor, many manufacturers of domestic production equipment does not have the technology to use this sensor, because the dynamic force sensor acquisition value is thousands of times the static force sensor, so the analysis board has strict Requirement‚ If the board acquisition analysis technology is not successful, there will be the occurrence of crashes, damage, etc. We have passed a large number of tests in the entire process of R&D, organized Qingdao force experts to set up a R&D supervision team, and designed a new brand for this sensor. Board acquisition system and analysis system After we introduced a mature technology, excellent quality helmet impact testing machine, for the majority of users provide not only equipment, but more accurate data.

5, base: with impact strength can firmly install the load cell. The standard requires that the base be cast of concrete, but after many experiments we found that this method is very impractical. Casting concrete in an attractive laboratory is neither beautiful nor clean. Laboratory decoration or renovation Well, then the user will need to remove the concrete to carry out the next step, but in the process there will be irreparable damage to the equipment. So we have designed a brand new fixed-type helmet through a professional R&D team. The impact tester guarantees that no problems such as resonance, buffering, and tremor will occur in the laboratory. This design won praise in the country, affirming our efforts and clarifying our development goals.

6, power display device: When the circuit forms a closed loop, you can send a signal that the puncture cone has been in contact with the head mold.

7. Pretreatment: The new standard puts forward a lot of preprocessing methods, which are more relevant to the actual situation. Our team feels that we are comfortable with the pretreatment projects that have been added to this standard. The country has great care for our hard working people. The helmets, UV aging tanks and helmets are qualified through a series of inspections at the factory. However, after these products have flown to the market, will the hard-working working people still have safety in the hot sun? The new helmet is placed in the helmet ultraviolet ray irradiation box according to the standard irradiation time pretreatment and then the helmet is subjected to the impact puncture and other related tests. After the data is obtained, it can be judged whether the helmet will be qualified after a certain period of time. It can be seen that the AQSIQ is striving for the life safety of working people. This kind of similar experiment also has the helmet low temperature box, the safety helmet high temperature box, the safety helmet constant temperature water soaks the box.