what specifications must safety helmet meet in construction? Do you know the function of various parts?

Safety helmet must be properly worn when entering the construction site. The casualty accidents happened in the construction site, especially the object striking and falling accidents, show that the consequences of accidents will be reduced and avoided if the safety helmet is properly worn; 1f the safety helmet is not properly worn, it will lose its protective effect on the head and cause serious injury< 1. Specification requirements: vertical spacing: measured according to the specified conditions, the value should be between 25-50mm horizontal spacing: measured according to the specified conditions, the value should be between 5-20mm wearing height: measured according to the specified conditions, the value should be between 80-90mm cap hoop size: divided into the following three numbers small size: 51-56cm medium size: 57-60cm large size: 61-64cm weight: a complete safety helmet, Changwei learned from the data that the weight should be reduced as much as possible, and should not exceed 400g brim size: minimum 10 mm, maximum 35 mm. The brim slope is 20 °- sixty ° 1t’s better air vent: air vent can be set on both sides of safety helmet visor: minimum 10 mm, maximum 55 mm Color: the color of safety helmet is generally light or eye-catching, such as white, light yellow, etc2. Structure and function of parts: shell: bear the impact to separate falling objects from human body cap hoop: keep the safety helmet in a certain position on the head top belt: disperse the impact force and keep the cap shell floating to disperse the impact force rear hoop: locking device of head hoop chin strap: to assist in maintaining the status and position of the helmet sweat band: sweat absorption cushion: reduce the impact force in case of impact wearing height: it reflects the height difference between the forehead and the top of the head, which interferes with the eyes, ears and wearing objects. The hoop of the safety helmet is separated from the forehead. The fastening part can’t be closed, so it can’t guarantee a certain state and position on the head vertical spacing: reflects the gap between the inside of the cap shell and the top of the head. 1f it is too small, the ventilation is not smooth, and if it is too large, the gravity center of the helmet shell will rise, resulting in the instability of the helmet on the head horizontal spacing: provide buffer space when there is lateral force in the impact. 1t is also a cooling channel

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