Composite structure bulletproof helmet with lining and preparation method of composite structure bulletproof helmet

Abstract

The invention provides a composite structure bulletproof helmet with a lining and a preparation method of the composite structure bulletproof helmet. A helmet shell comprises a high-strength polycarbonate alloy lining and an ultra-high molecular weight polyethylene fiber non-woven fabric shell. And the two are connected through a vacuum composite bonding process to form a stable composite structure. According to the structure, the sunken depth after bouncing is obviously reduced, the protection effect is improved, and the production cost is reduced. The method is suitable for large-scale manufacturing of military police protection equipment.

Description

Technical Field

[0001] The invention relates to the field of bulletproof equipment, and in particular to a bulletproof helmet with a composite structure and an inner lining and a preparation method thereof. Background Art

[0002] As an important part of personal protective equipment, bulletproof helmets are widely used in military, law enforcement and security fields. Their main function is to resist fatal injuries to the head caused by high-speed projectiles or fragments. Existing lightweight bulletproof helmets are generally divided into the following two categories: Aramid composite helmet, aramid (aromatic polyamide fiber) has high specific strength and specific modulus, and the helmet shell made of it has the following characteristics: Advantages: ① Small thickness of the helmet shell: high material strength, small material thickness required; ② Small dynamic depression: when the bullet hits, the depression depth of the helmet is small, which reduces the impact on the wearer's head; ③ Excellent high temperature resistance: suitable for use in high temperature environment, not easy to deform; ④ Strong rigidity: outstanding anti-deformation ability. Disadvantages: ① High manufacturing cost: Aramid fiber is expensive, resulting in a high overall cost of the helmet; Difficult processing: ② Aramid fiber processing requires complex processes and high-precision equipment, and low production efficiency.

[0003] Ultra-high molecular weight polyethylene (PE) composite helmet, Ultra-high molecular weight polyethylene (UHMWPE) is a material with high tensile strength and low density. Its helmet products also occupy a certain proportion in the market. Advantages: ① Low cost: Compared with aramid fiber, the price of PE fiber raw materials is lower; ② Light weight: PE fiber has a low density, the finished helmet is light and comfortable to wear. Disadvantages: ① Large dynamic depression: Although PE fiber has high tensile strength, its rigidity is insufficient. When the bullet impacts, the helmet shell is prone to large depression, which may cause secondary damage to the head; ② Poor high temperature resistance: PE fiber is easy to soften or deform under high temperature conditions and is not suitable for use in high temperature environments.

[0004] Although aramid and PE composite helmets have their own advantages, it is difficult for single-material helmets in the existing technology to achieve both high performance and low cost. The performance of single-material helmets is limited: aramid helmets have good rigidity and small concavity but high cost, while PE helmets have low cost but large dynamic concavity. Neither can fully meet the needs of military and police departments for large-scale equipment. It is difficult to balance performance and economy: the market urgently needs a bulletproof helmet that can meet both high bulletproof performance and low cost advantages. Summary of the invention

[0005] The purpose of the present invention is to provide a composite structure bulletproof helmet with an inner lining and a preparation method thereof, aiming to improve the bulletproof performance and significantly reduce the depth of bullet impact depression through structural design, optimization of material selection and preparation process; enhance the rigidity and safety of the helmet and reduce damage to the head; reduce production costs and meet the needs of large-scale equipment.

[0006] The present invention is implemented by adopting the following technical scheme: a composite structure bulletproof helmet with lining, comprising an outer shell and an inner lining, the outer shell and the inner lining are composited into one by bonding, riveting or screwing, the outer shell provides anti-ballistic performance, and the inner lining provides rigidity and impact resistance.

[0007] Furthermore, the inner liner is integrally formed of a high-strength polycarbonate alloy material.

[0008] Furthermore, the shell is formed by composite pressing of several layers of ultra-high molecular weight polyethylene fiber non-woven fabrics, and aluminum alloy, titanium alloy, carbon fiber and other engineering plastics can also be used.

[0009] Furthermore, the inner lining and the outer shell are compositely connected by a vacuum bonding process, the outer surface of the composite helmet shell is provided with a surface coating, and an edge sealing strip is adhered to the edge of the outer shell.

[0010] Furthermore, the surface coating is a polyurethane wear-resistant coating, which can improve the durability of the helmet.

[0011] A method for preparing a bulletproof helmet with a composite structure and a liner, comprising the following steps: Step 1, lining preparation: Use high-strength polycarbonate alloy material to form the liner through injection molding process, including high-temperature melting, cavity injection, and pressure-maintaining cooling; Step 2: Shell preparation: Cutting several layers of ultra-high molecular weight polyethylene fiber non-woven fabric, stacking them according to specifications and then obtaining the shell through a pre-pressing process, and further trimming, cold pressing and shaping, and polishing; Step 3: Bonding the inner and outer shells: Apply adhesive to the inner surface of the shell, align the lining and the shell and press them tightly, and achieve bonding through a vacuum high-pressure composite process; Step 4: Surface treatment: The surface of the composite helmet shell is polished, a protective coating is sprayed, and edge sealing strips are adhered to the edge of the shell.

[0012] Furthermore, the pre-pressing and molding of the shell in step 2 specifically includes applying pressure and a constant temperature in a hydraulic press to obtain a preliminarily molded shell after a certain period of time.

[0013] The composite structure bulletproof helmet with lining and the preparation method thereof described in the present invention have the following beneficial effects: Reduce the depth of dents caused by bullet impact: Experiments have shown that the dent depth of the composite structure bulletproof helmet in the bullet impact test is much lower than that of the traditional PE helmet; Improved safety: The composite structure significantly enhances the rigidity of the helmet, reducing the impact of bullet impact energy on the wearer's head; Reduce production costs: The materials used are low cost and the process is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 A schematic diagram of a composite structure bulletproof helmet with an inner lining; In the figure, 1-shell, 2-lining, 3-surface coating, 4-edge sealing strip. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a bulletproof helmet with a composite structure and a lining includes an outer shell 1 and an inner lining 2, which are bonded and composited into one body, a surface coating 3 is sprayed on the outer side of the outer shell 1, and an edge-sealing rubber strip 4 is installed at the edge of the outer shell 1. The inner lining 2 is integrally formed by an injection molding process of a high-strength polycarbonate alloy material to provide high rigidity and impact resistance, and the outer shell 1 is compositely pressed and molded by several layers of ultra-high molecular weight polyethylene fiber non-woven fabric to provide bulletproof performance.

[0019] The inner lining 2 and the outer shell 1 are compounded into an integral structure through a vacuum bonding process. The surface coating 3 is a high temperature resistant and anti-corrosion coating. The edge sealing strip 4 is adhered to the edge of the outer shell 1, and the edge sealing strip 4 is a wear-resistant edge sealing strip.

[0020] A method for preparing a composite structure bulletproof helmet with an inner lining comprises the following specific steps: Step 1: Lining preparation: The high-strength polycarbonate alloy material is dried and dehumidified; injection molding: the material is heated to a molten state, injected into the mold cavity through an injection molding machine, and the liner shell is obtained after pressure-maintaining cooling.

[0021] Step 2: Shell preparation: Cut the ultra-high molecular weight polyethylene fiber non-woven fabric and lay it in layers according to specifications; heat and press it in a hydraulic press to obtain a preliminarily formed shell; and cold press it after trimming to remove burrs.

[0022] Step 3: Bonding and lamination: Apply adhesive evenly on the inner surface of the shell, align the lining and the shell and press them tightly; place them in a vacuum environment and apply a pressure of 0.8-1.2MPa, maintain for 30-60 minutes to complete the bonding and lamination.

[0023] Step 4: Surface treatment: Use spraying equipment to evenly apply the high temperature resistant coating on the surface of the helmet shell; adhere wear-resistant edge sealing strips to the edge of the helmet shell.

[0024] Ultra-high molecular weight polyethylene fiber has extremely high tensile yield strength. When multiple layers of ultra-high molecular weight polyethylene fiber non-weft cloth are pressed into a helmet shell, it can effectively block the penetration of bullets and fragments, but its rigidity is poor. When shot by a bullet, it will produce a large bullet mark deformation under the action of the bullet's impact energy. When the bullet mark height is greater than the gap between the helmet shell and the wearer's head, the deformed protruding points will impact and squeeze the wearer's head, causing injury to the wearer. This is the fatal flaw of the current pure PE helmet.

[0025] High-strength polycarbonate plastic alloy material itself is not a bulletproof material, but it has extremely strong impact resistance. When used as an inner lining and combined with an ultra-high molecular weight polyethylene (PE) fiber shell, it can effectively enhance the rigidity of the ultra-high molecular weight polyethylene (PE) fiber shell, overcome the impact energy generated when the bullet is shot, and reduce the height deformation of the bullet mark, thereby avoiding impact and extrusion injuries to the wearer's head and effectively protecting the wearer.

[0026] GA 293-2012 standard stipulates that: in the case of 5 effective hits, the bulletproof helmet should block the bullet head, and the height of the bullet hole on the helmet shell is less than or equal to 25mm. However, under the test conditions of a 1954-style pistol, 7.62mm pistol bullet, initial velocity 445m / s, and shooting distance 5m, the performance test structure of a composite structure bulletproof helmet with lining in the present application shows that the bullet hole depth is less than 25mm, and no penetration occurs.

[0027] The above embodiments describe the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the changes and modifications made by those skilled in the art shall be within the scope of protection of the appended claims of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A bulletproof helmet with a composite structure and a lining, characterized in that: The invention comprises an outer shell (1) and an inner lining (2), wherein the outer shell (1) and the inner lining (2) are integrally connected, the outer shell (1) provides anti-ballistic performance, and the inner lining (2) provides rigidity and impact resistance.

2. A bulletproof helmet with a composite structure and a liner according to claim 1, characterized in that: The inner liner (2) is integrally formed using a high-strength polycarbonate alloy material, and may also be made of aluminum alloy, titanium alloy, carbon fiber, or other engineering plastics.

3. A bulletproof helmet with a composite structure and a liner according to claim 1, characterized in that: The shell (1) is formed by composite pressing of a plurality of layers of ultra-high molecular weight polyethylene fiber non-woven fabrics.

4. A bulletproof helmet with a composite structure and a liner according to claim 1, characterized in that: The outer shell (1) and the inner lining (2) are connected by bonding, riveting or screwing to form a composite structure.

5. The composite structure bulletproof helmet with lining according to claim 1, characterized in that: The inner lining (2) and the outer shell (1) are compositely connected by a vacuum bonding process; the outer surface of the composite helmet shell is provided with a surface coating (3); and an edge sealing strip (4) is adhered to the edge of the outer shell (1).

6. A bulletproof helmet with a composite structure and a liner according to claim 5, characterized in that: The surface coating (3) is a polyurethane wear-resistant coating, which can improve the durability of the helmet.

7. A method for preparing a bulletproof helmet with a composite structure and a liner as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, lining preparation: Using high-strength polycarbonate alloy material to form the liner (2) through an injection molding process, specifically including high-temperature melting, mold cavity injection, and pressure-maintaining cooling; Step 2: Shell preparation: Cutting a plurality of layers of ultra-high molecular weight polyethylene fiber non-woven fabrics, stacking them according to specifications and then performing a pre-pressing molding process to obtain a shell (1), and further trimming, cold pressing and shaping, and polishing; Step 3: Bonding the inner and outer shells: Applying adhesive to the inner surface of the outer shell (1), aligning the inner lining (2) with the outer shell (1) and pressing them tightly, and bonding them by vacuum lamination process; Step 4: Surface treatment: The surface of the composite helmet shell is polished, a protective coating is sprayed, and edge sealing strips are adhered to the edge of the shell.

8. The method for preparing a bulletproof helmet with a composite structure and a liner according to claim 7, characterized in that: The pre-pressing and forming of the shell in step 2 specifically includes applying pressure and a constant temperature in a hydraulic press to obtain a preliminarily formed shell after a certain period of time.

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