Safety helmet protection

In the production work, accidental fall injuries and human accidents occur from time to time. The damage to the human body caused by falling objects is mainly caused by the impact of acceleration. This kind of accident is characterized by sudden and strong, not easy to dodge, at the same time, the action time is short, the impact force is great, especially the falling object from top to bottom, the impact process only occurs in a moment. The accidents occurred in construction, mining, metallurgy, mining, oil exploration, tunnels and other industries. Once a shock accident occurs, the head is the first one with the highest probability of injury. The head is the nerve center of the human body, and the thinnest part of the skull is only about 2mm. Once the head is impacted by an external force, it may cause serious concussion, intracranial hemorrhage, meningeal contusion, skull injury and other serious injuries, resulting in human body dysfunction, ranging from disability, to life-threatening. Therefore, the head of workers in the workplace must be protected, and the important item for head protection is a safety helmet.
How much does the human body withstand the momentary impact? According to relevant research data from abroad, the human cervical vertebrae will be broken when 4900N, and the brain will flow out, which will endanger life. The shorter the action time, the longer the impact distance and the heavier the impact drop, the greater the impact force. When an impact injury accident occurs, the impact force is generally much greater than 4900 N. This requires the operator to wear a safety helmet to prevent the falling object from causing damage to the human body.
The protective effect of the safety helmet is that when the operator is impacted or squeezed by a falling object or a hard object, the impact force is reduced, and the damage to the human head is eliminated or reduced. Theoretically speaking, during the impact process, that is, from the moment when the falling object contacts the head, to the falling object to separate from the cap shell, the various parts of the helmet (hat shell, cap liner, socket, reins, cushions, etc. Firstly, the impact force is decomposed, and then most of the impact force is absorbed through the elastic deformation, plastic deformation and reasonable destruction of each part, so that the impact force acting on the human head is less than 4900 N, thereby playing a protective role. This performance of the helmet is called impact absorption performance and is one of the important indicators to determine whether the helmet is qualified or not.