What principle does the helmet use to withstand pressure?

There are three main principles that can withstand pressure in a hard hat:

1. Cushioning and shock absorption: there is a gap of 25 to 50mm between the cap shell and the cap lining, and when the object hits the helmet, the cap shell will not directly affect the top of the head due to force deformation.

2. Dispersion of stress: the cap shell is oval or hemispherical, the surface is smooth, when the object falls on the cap, the object can not stay and slide off immediately; And the force bearing of the striking point of the cap shell is transmitted to the periphery, and the force that is reduced by the cushioning of the cap lining can reach more than 2 3, and the remaining force is transmitted to the skull of the person through the whole area of the cap lining, so that the force point becomes the force surface, thereby avoiding the stress concentration of the impact force at a certain point on the cap shell, and reducing the force per unit area.

3 Biomechanics: The national standard stipulates that the helmet must be able to absorb 4900N. This is because of biological tests, the maximum limit of the human cervical spine when it is stressed, and if it exceeds this limit, the cervical spine will be injured, causing paralysis in light cases and life-threatening in severe cases.

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Agree with the statement of the first floor.

Summary. Helmets must be worn in the following situations:

1) All employees of the company's organs must wear safety helmets as long as they go to the workshop and production post to inspect the work.

2) Workshop leaders, technicians and other personnel must wear safety helmets when working in the production area of the unit.

3) Maintenance personnel must wear safety helmets when carrying out maintenance operations.

4) Visitors and learners must wear safety helmets to enter the production area.

5) Outsourced engineering construction personnel must wear safety helmets when entering the factory.

6) Superior leaders and inspectors at all levels must wear safety helmets when entering the production area.

When to use a hard hat.

Safety helmets must be worn in the following situations: (1) All employees of the company must wear safety helmets as long as they go to the workshop and production post to inspect the work. 2) Workshop leaders, technicians and other personnel must wear safety helmets when working in the production area of the unit.

3) Maintenance personnel must wear safety helmets when carrying out maintenance operations. 4) Visitors and learners must wear safety helmets to enter the production area. 5) Outsourced engineering construction personnel must wear safety helmets when entering the factory.

6) Superior leaders and inspectors at all levels must wear safety helmets when entering the production area.

7) Warehouse keepers are required to wear safety helmets when working in the warehouse. (8) All logistics personnel must wear safety helmets when entering the production area. (9) Wear a safety helmet when climbing the height.

There are three main principles for a helmet to be able to withstand pressure:

1.Cushioning and shock absorption: There is a gap between the cover and the cover lining. When an object is blown by the helmet, the cap shell will not directly affect the top of the head due to the deformation of the force.

Helmets can effectively protect our heads and protect us from the outside world.

Cushioning effect to prolong the force time.

On the premise of ensuring that the safety helmet bears the impact force, the more () it is required to cover the line well.

a.Heavy. b.Light.

c.Small strap matching.

Correct Answer: Macro Boom B