Magnesium alloy helmet adopting honeycomb reinforcing ribs

A magnesium alloy and helmet technology, applied in the field of magnesium alloy helmets, can solve the problems of decreased helmet strength and human cervical vertebra compression, and achieves the effects of protecting the human body, reducing injuries, and having good impact resistance.

Active Publication Date: 2017-08-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. The shell material of the helmet should be as thick and light as possible
This type of helmet has the problem of being too heavy, and long-term wearing will cause compression on the human cervical spine, but if the use of phenolic resin is reduced, the strength of the helmet will decrease

Method used

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  • Magnesium alloy helmet adopting honeycomb reinforcing ribs
  • Magnesium alloy helmet adopting honeycomb reinforcing ribs
  • Magnesium alloy helmet adopting honeycomb reinforcing ribs

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] The present invention has no special limitation on the preparation method of the helmet skeleton, and can be directly prepared by adopting the magnesium alloy forming technical scheme well known to those skilled in the art, such as by adopting the method of integral die casting.

[0055] In the present invention, the aerogel filled in the inner honeycomb structure of the helmet frame is referred to as the inner aerogel layer, and the aerogel filled in the outer honeycomb structure of the helmet frame is referred to as the outer aerogel layer. In the present invention, aerogel is a form of solid matter, which is one of the solids with low density in the world. The density is 3 kilograms per cubic meter, which is only 2.75 times the density of air. Since more than 80% of the aerogel is air, it has a very good thermal insulation effect. One inch thick aerogel is equivalent to the thermal insulation function of 20 to 30 pieces of ordinary glass. Even if the aerogel was pla...

Embodiment 1

[0079] The AZ91 magnesium alloy helmet skeleton is prepared as a whole by die casting. The helmet skeleton structure is as follows figure 1 As shown, the thickness of the helmet shell is 4mm, the honeycomb structure of the inner and outer surfaces of the helmet shell, the honeycomb structure is formed by several regular hexagonal cells, and the wall thickness of the regular hexagonal cells of the inner surface honeycomb structure is 1mm (S1), The wall height is 10mm (H1), and the diagonal distance is 10mm (L1). L2).

[0080] Cut the aerogel (silica nano-aerogel produced by Jinna Company) into an aerogel liner with regular hexagonal prisms, the size of the regular hexagonal prisms and the size of the regular hexagonal cells in the honeycomb structure are interference fit, The regular hexagonal prism can just be filled into the regular hexagonal cell, and the thickness of the aerogel pad is 10 mm. Filling the prepared two aerogel liners into the honeycomb structure on the inne...

Embodiment 2

[0087] The helmet body was prepared according to the method described in Example 1.

[0088] Use epoxy resin colloid to bond two layers of glass fiber cloth on the outer surface of the helmet helmet, put the helmet body into the mold, heat and pressurize after the mold is closed, the pressurization pressure is 2MPa, the heating temperature is 150℃, and the pressurized heating The time is 4 hours; a fiber cloth layer is formed on the outer surface of the helmet.

[0089] The surface of the fiber cloth layer is coated with a heat-resistant layer slurry to form a heat-resistant layer with a thickness of 1 mm to obtain a fire helmet; Boron ceramic powder, rare earth luminescent powder and aerogel particles.

[0090] After measurement, the weight of the fire helmet prepared in Example 2 of the present invention is 597 grams.

[0091] According to GA 44-93 "National Standard for Fire Helmets", the penetration performance, electrical conductivity and heat resistance performance of ...

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Abstract

The invention provides a helmet. The helmet comprises a magnesium alloy helmet framework with honeycomb structures on the inner side and the outer side, an inner aerogel layer with which the honeycomb structure on the inner side is filled, an outer aerogel layer with which the honeycomb structure on the outer side is filled, a fiber cloth layer arranged on the surface of the outer aerogel layer, and a heat-resisting layer arranged on the surface of the carbon fiber cloth layer. The firefighting helmet is prepared in a composite damping mode of multiple materials such as magnesium alloy, aerogel and fiber cloth, and the magnesium alloy has the high specific strength, the low elasticity modulus and the shock-resistant property, and serves as a main shock-resistant structure. According to the magnesium alloy framework adopting the honeycomb structures, the weight of the helmet framework is greatly reduced on the basis of achieving good shock resistance. The helmet has good protective performance on the basis of reducing the weight of the helmet, compared with a firefighting helmet made of phenolic aldehyde glass fiber reinforced plastic, the human body can be more effectively protected, harm to the human body in a fire scene is reduced, and the helmet is low in mass and convenient to wear.

Description

technical field [0001] The invention relates to the technical field of helmets, in particular to a magnesium alloy helmet using honeycomb reinforcing ribs. Background technique [0002] In fire fighting and emergency rescue, firefighters' heads are often injured by heat, smoke, poison, radiation, electric shock, and external impact from the fire. Fire helmets can provide overall protection to firefighters' heads. The head injury caused by fire environment to firefighters can generally be divided into thermal environment injury, mechanical external force injury and electrical leakage injury. [0003] Studies have shown that the helmet-head-neck system is nonlinear, and its response is also nonlinear. When the force increases, the force on the neck, the relative displacement of the helmet-head and the acceleration of the head all increase nonlinearly. The harder the helmet hits, the shorter the impact force. The lower the stiffness and hardness of the impactor, the longer t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A42B3/04A42B3/06
CPCA42B3/04A42B3/063
Inventor 程丽任张洪杰宋术岩
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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