安全帽的作用是保护头部不受到坠物和特定因素引起的伤害，由帽壳、帽衬、下颌带及其附件组成，安全帽具有缓冲减震作用和分散应力作用，在受到外力的冲击后，大程度的保护头部不受伤害。Therole of the safety helmet is to protect the head from fallingobjects and specific factors. It is composed of a cap shell, a caplining, a chin strap and its accessories. The safety helmet hascushioning and shock absorption and stress dispersing effects, andis impacted by external forces. After that, the maximum degree ofprotection of the head from injury.