Plastic Motocross Helmet Mould
Hard hat can withstand pressure mainly uses three principles:
1. Cushioning and damping effect: There is a gap of 25 ~ 50mm between the cap shell and the cap liner. When the object hits the helmet, the cap shell does not directly affect the top of the head due to the deformation of the force.
2. Dispersed stress effect: The cap shell is elliptical or hemispherical, and the surface is smooth. When an object falls on the cap shell, the object cannot stay and immediately slide down; and the force received by the impact point of the cap shell is transmitted to the surroundings, which is reduced by the buffer of the cap lining The force can reach more than 2/3, and the rest of the force is transmitted to the human skull through the entire area of the cap liner, which changes the focus point to the force surface, thereby avoiding the concentration of impact force at a certain point on the cap shell and reducing Force per unit area.
3. Biomechanics: The national standard stipulates that the helmet must be able to absorb 4900N. This is because of the biological test, the maximum limit of the human cervical spine when it is stressed. If it exceeds this limit, the cervical spine will be injured, and the mild will cause paralysis, and the severe will be life-threatening.
Cap shell: Withstand the impact and separate the falling objects from the human body.
Hoop: keep the helmet in a certain position on the head.
Top band: Disperse the impact force, keep the cap shell floating in order to disperse the impact force.
Rear hoop: The locking device of the headband.
Jaw strap: assists in maintaining the state and position of the helmet.
Sweat band: to absorb sweat.
Cushion cushion: When impact occurs, reduce the impact force.
Wearing height: It reflects the height difference from the forehead to the top of the head, which interferes with the eyes, ears and wearing objects. The headband of the hard hat is detached from the forehead. The tightening part cannot be closed, and cannot guarantee a certain state and position on the head.
Vertical spacing: reflects the gap between the inside of the cap and the top of the head. If it is too small, the ventilation is not smooth, and if it is too large, the center of gravity of the cap shell rises, causing the helmet to be unstable on the head.
Horizontal spacing: Provide buffer space when there is lateral force in the impact. It is also a cooling channel.
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