Everyone who rides motorcycles and electric bicycles probably knows how important safety helmets are, but at the same time there is a doubt: There are various helmets on the market, and the quality is uneven. How can I buy a helmet that can really protect me? Please see the article below. Studies have found that most of the deaths in road traffic accidents involving motorcycles are caused by head injuries. If the safety helmet is used correctly, it can greatly reduce the direct injury of the accident to the driver and passenger, and effectively reduce the fatality rate of the motorcycle accident. At the same time, it should be noted that in actual use, fake and inferior helmets not only fail to protect the head, but also cause parts to break due to impact, thereby causing other secondary injuries to organs. Therefore, the use of qualified motorcycle helmets is the key to ensuring the safety of motorcycles. 1. Introduction of motorcycle helmets The motorcycle occupant helmet is a special equipment used to reduce the head injury of the occupant in the traffic accident. A helmet usually consists of a shell, a buffer layer, a comfortable pad, wearing equipment, goggles, etc. The shell and the buffer layer are composed of It is a key part of the helmet to absorb impact energy and protect the head from injury. Goggles can better protect the eyes, and whether the wearing equipment is "firm" will also have a direct relationship with the protective effect of the helmet. According to different shapes and structures, helmets are divided into two categories: full-face helmets and half-face helmets. The key difference between the two is the different protection range. Compared with half-face helmets, full-face helmets enhance the protection of the chin part. According to different applicable objects, helmets can be divided into two categories: A-type helmets and B-type helmets. A-type helmets are suitable for motorcycles with a total displacement of 125cc or more, and there are two types of full-face helmets and half-helmet; B-type helmets are suitable for the total displacement of motorcycles. The volume and weight of motorcycles below 125cc are lower than those of Class A helmets, and the shapes are all half helmets. Under normal circumstances, the protection range and protective performance of Class A helmets are better than those of Class B helmets. Helmet Type Tips 2. Quality management requirements for motorcycle occupant helmets National Standard: In order to standardize and improve the product quality of motorcycle occupant helmets, it is proposed and managed by the Ministry, and the Ministry of Traffic Management Science Research Institute undertakes to formulate mandatory national standards. The current standard version is "Motorcycle Passenger Helmets" (GB811-2010). From the perspective of ensuring the safety of passengers, the GB811 specification provides a series of regulations such as technical standards and test methods for helmets. CCC certification: In October 2017, the General Administration of Quality Supervision, Inspection and Quarantine and the National Certification and Accreditation Administration announced the "Announcement on the Transitional Arrangement for the Management of Motorcycle Passenger Helmets, Electric Blankets and Moped Products to Compulsory Product Certification" (2017 No. 86) Regulations From November 01, 2017, the compulsory product certification management for motorcycle occupant helmet products was officially implemented. From August 1, 2018, motorcycle occupant helmets that have not obtained CCC certification cannot leave the factory, sell, import or operate in other businesses. applied in the event. National Standard and CCC Certification Standard for Motorcycle Crew Helmet Quality identification: Motorcycle rider helmets with qualified quality must pass the mandatory product certification ( CCC certification). CCC certification (left) and CCC certification (right) 3. The key performance of motorcycle occupant helmets Strict technical testing is an important link to ensure the quality and safety of helmets. According to the regulations of "Motorcycle Rider Helmets" (GB811-2010), qualified motorcycle rider helmets need to pass the "line of sight", "goggles", "stiffness performance", "absorption". Impact kinetic energy performance" and "penetration resistance performance" and other 10 items of testing, among which, "impact kinetic energy absorption performance" and "penetration resistance performance" are representative indicators of helmet safety performance. Impact kinetic energy absorption performance: The key reflects the helmet's ability to absorb impact energy and reduce head damage in the event of a collision. During the inspection, the helmet fixed in the head mold (simulating the human head) needs to be dropped from the required height, and one condition and two performance parameters are evaluated. Taking Class A helmet as an example, the helmet shell should not be cracked after the experiment, the peak acceleration of the transmission stop mode after impact (indicating the impact force size) cannot exceed 300g, and the effective time of the acceleration exceeding 150g (indicating the duration of the hazardous impact) Should be less than 4ms. Penetration resistance: The key reflects the ability of the helmet to avoid penetrating and causing damage to the head when it encounters a sharp object. During the inspection, a steel cone with a quality of 3kg, a diameter of 25mm and a cone angle of 60° was selected to fall from the required height (3m for a Class A helmet), and a penetration test was carried out on the helmet. After the experiment, the steel cone cannot penetrate the helmet and touch the head shape, and the helmet shell cannot be cracked.