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Helmet structure and material

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Helmet structure and material

作者: Release Date: 2017-04-27 Author: Click:

The safety helmet is composed of a hat shell and a hat lining, which are used to disperse and buffer the external kinetic energy and reduce the head bearing force to a tolerable level.

1. The cap shell The cap shell plays the first protective role against external impacts, dispersing the force and absorbing part of the kinetic energy. The top of the shell should have some strength and elasticity. The top of the cap shell is smooth and arc-shaped, which is good for dispersing force. In order to reduce weight, the top of the cap is reinforced to increase strength and elasticity.

2. Cap lining Cap lining is used to reduce the impact force and absorb the moving foot. The standard stipulates that there is a 50mm space between the cap shell and the cap liner for cushioning, preventing kinetic energy from being directly transmitted to the head. Cap lining is divided into plastic lining, nylon tape lining, cotton webbing lining. The Xiang style has one layer of top belt and two layers of top belt. It is connected to the cap shell by plastic plug, plastic or metal rivets, and the cap shell is directly drilled by nylon rope.

The principle of absorbing kinetic energy of the cap lining is as follows: (1) Each part of the material of the cap lining is deformed after being stressed, because the space between the cap shell and the cap lining is 50m III, allowing the material to extend. The densely woven material extends slowly and for a long time without hitting the top, and plays a buffering role. The soft material extends quickly, easily touches the top, cannot disperse the force, and is not safe. (2) The cap liner plug will be broken when the lining tape reaches the limit, and a reasonable break is allowed. If the lining is provided with four or six connecting plugs, 1/8 of them will break after being stressed, which will not cause the bow i to touch the top. If it is broken by 1/2, there is a danger of hitting the top. There are two layers of top belts, and one layer will not touch the top after breaking. This is allowed. (3) The plastic plug forms a scratch in the socket, which generates resistance, prolongs the impact time, and buffers the force, as shown in Figure 12-16. There should be space in the socket, so that the plug can be stressed after I. I. G- ~, produce friction.

The material of the cap shell is polyester resin FRP, polystyrene resin, acrylonitrile butadiene: styrene copolymer ABS, polycarbon

Acid ester P (), polyethylene PB, and the like. Their performance is high strength. Heat insulation, good insulation performance, acid and alkali resistance. Industrial helmet and motorcycle

The motorcycle helmets are made of the above materials. The helmet made of metal aluminum can prevent fire, prevent mud splashing, and prevent static electricity. China's cap shells are also made of plants such as wicker, bamboo, rattan, etc., which are suitable for open-air operations in summer.

Ju material hat. Vinylon hat_with cold protection material, can be used as winter cold protection helmet.

Safety helmets should be shown in various colors for safety management. The helmets worn in hazardous work sites, factories that are not allowed to enter, and commanders should be different in color from general helmets. If the colors are the same, another color bar should be pasted on the cap shell to show the difference.

The standard for helmets stipulates that the cap weight does not exceed 40 ¨ 0g. In order to ventilate, air holes can be made on the sides or front and back of the shell. Distance, the height of the cap lining is 80 ~ 90Ⅲm, to ensure the safety of the wearer.


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