CN112161521B - Modular spliced explosion protection fence and explosion-proof blanket - Google Patents

Abstract

The invention discloses a modular spliced explosion protection fence and an explosion-proof blanket. The use of the invention can change the size of the fence, is suitable for suspected explosives of different sizes, can effectively intercept the high-speed fragments generated by the explosion, and does not contain hard media, and will not cause secondary damage in the event of excessive explosion; at the same time, the space occupied during normal storage is small. , the weight of a single module is light. The modular splicing fence of the present invention is formed by splicing a plurality of identical single-module structures; the single-module structure is made of flexible bulletproof materials, which will not cause secondary damage, and the single-module structure includes a bulletproof layer, a support Layer and elastic layer, the fragments generated by the explosion are embedded in the fence to avoid the fragments rebounding and bouncing under the action of the explosive products to cause damage.

Description

Modular spliced explosion protection fence and explosion-proof blanket

technical field

The invention relates to the technical field of explosion-proof equipment, in particular to a modular spliced explosion protection fence and an explosion-proof blanket.

Background technique

Blast attack is the most lethal way in terrorist attack, and the damage to human body during the explosion process is mainly shock wave and fragmentation. When the peak pressure of the shock wave reaches 0.03MPa, it will cause damage to the human body; for small-equivalent explosives, such as a grenade with a TNT equivalent of about 40-60g, the shock wave's killing range is within 3m, and its main killing method is Fragments, and for the fragments, it is generally believed that the kinetic energy of the fragments above 10kg·m ² will cause damage to the human body.

As terrorism spreads around the world, explosives come in many forms and sizes. Generally, explosives have some outer packaging, such as leather bags, luggage, packaging bags, etc. for camouflage. When the outer packaging of explosives is bulky and unsuitable for unpacking, an explosives disposal equipment that can meet its appropriate size is required. Existing explosives disposal equipment, such as explosion-proof tanks, explosion-proof barrels, explosion-proof boxes, explosion-proof blankets, etc., the size of these equipment is fixed. The larger the explosive, the larger the explosion-proof equipment required, and the larger the explosion-proof equipment, the larger the volume and weight it occupies. For structures where the size of the explosive is larger than that of the explosion-proof equipment, it cannot be disposed of. In addition, the existing explosive disposal equipments are all integrated, which have certain inconvenience in the process of storage and transportation.

CN206264477U discloses a modular splicing type explosion-proof fence, but its structure is complex, the process requirements are higher, and the splicing time is long. When using this splicing fence to deal with explosives, it is necessary to splicing around the explosives on site. If the explosives explode at this time, there is a high risk. In addition, this spliced explosion-proof fence contains hard media, such as metal or ceramics, at the splicing place. If an excessive explosion occurs, it may disintegrate and cause secondary damage.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a modular spliced fence and an explosion-proof blanket, which can be quickly assembled during use, can change the size of the fence, are suitable for suspected explosives of different sizes, can effectively intercept the high-speed fragments generated by the explosion, and do not Contains hard media, no secondary damage will occur in the event of excessive explosion; at the same time, it takes up little space during normal storage, and the weight of a single module is light.

The modular splicing fence of the present invention is formed by splicing a plurality of identical single-module structures; the single-module structure includes a flexible bulletproof layer 3.3, a support layer 3.4 and an elastic layer 3.5, wherein the bulletproof layer 3.3 is used to prevent explosions. The support layer 3.4 is used for the support of the overall structure; the elastic layer 3.5 is arranged on the inner side of the single-module structure. When the fragments penetrate the elastic layer and are embedded in the bulletproof layer, the elastic layer has a certain degree of shrinkage to prevent the fragments from being embedded in the bulletproof layer. After layering, it pops up again; one end of the single-module structure is raised, the length of the protrusion is 1/4 to 1/3 of the length of the single-module structure, and the width is 1/4-1/3 of the width of the single-module structure. There are grooves matching the protrusions; adjacent single-module structures are spliced together through the protrusions and grooves to form a fence.

Preferably, the single-module structure further comprises a fireproof layer 3.2 and an outer package 3.1, wherein the fireproof layer 3.2 is wrapped around the bulletproof layer, the support layer and the elastic layer, so as to prevent the combustion of the internal structure by the flame during explosion; The outer packaging 3.1 is used for waterproofing and provides some protection.

Preferably, the outer packaging 3.1 is made of waterproof Oxford cloth; the fireproof layer 3.2 is made of double-layer fireproof cloth.

Preferably, it includes a multi-layer support layer 3.4 and a bulletproof layer 3.3, and the support layer 3.4 and the bulletproof layer 3.3 are arranged in a staggered order.

Preferably, the elastic layer 3.5 is made of rubber, polyurea or polyurethane elastomer; the bulletproof layer 3.3 is made of one or more mixed woven bulletproof fiber materials of bulletproof PE fiber, aramid fiber, PBO fiber, and high-strength glass fiber; The support layer 3.4 is a PC board, and the surface of the PC board is sprayed with 1-2mm polyurea.

Preferably, it also includes a strap, which is wrapped on the outer surface of the fence and used to tighten the fence; the width of the strap is more than 2/3 of the height of the fence.

Preferably, the belt is made of one or more fiber materials of bulletproof PE fiber, aramid material, PBO fiber, and high-strength glass fiber.

Preferably, the strap is pasted on the outer surface of the fence through Velcro and tightened.

The present invention also provides an adjustable explosion-proof blanket, comprising an inner fence, an outer fence and a blanket, and the inner fence is the above-mentioned modular splicing fence.

Preferably, the outer fence is the above-mentioned modular spliced fence.

Beneficial effects:

The modular splicing fence of the present invention is formed by splicing a plurality of identical single-module structures, which can be spliced according to the size of the explosive, and is composed of flexible bulletproof materials, which will not cause secondary damage and can be deformed when large. Before the explosion, the fragments generated by the explosion are embedded in it to prevent the fragments from flying, which can provide effective protection.

The invention improves the structure of the fence, and at the same time has certain elasticity, the functions of fire prevention, impact resistance and fragmentation prevention are improved.

Description of drawings

Figure 1 is a schematic structural diagram of an adjustable explosion-proof blanket.

Figure 2 (a) is a schematic diagram of the overall structure of a single module of the fence; Figure 2 (b) is a schematic diagram of the structure of a single module of the fence.

FIG. 3 is a schematic diagram of a modular spliced fence after splicing. Figure 3(a) shows 6 pieces of splicing; Figure 3(b) shows 8 pieces of splicing.

Figure 4 is a schematic diagram of the belt structure.

Figure 5 shows the deformation of the fence when the 62g explosive is 0.04ms, that is, when the explosion begins.

Figure 6 shows the deformation of the fence when the 62g explosive is 0.08ms, that is, the explosion shock wave reaches the inner fence structure.

Figure 7 shows the deformation of the fence when the 62g explosive is 0.2ms, that is, when the fragments reach the inner fence.

Figure 8 shows the deformation of the fence when the 62g explosive is 1ms, that is, when the inner fence begins to have a large deformation.

Among them, 1- blanket, 2- strap, 3- inner fence, 4- outer fence; 3.1- outer packaging, 3.2- fireproof layer, 3.3- bulletproof layer, 3.4- support layer, 3.5- elastic layer.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

The invention provides a modular splicing fence, which is mainly applied to the fence structure of explosion-proof blankets, including inner fence and outer fence, both of which can adopt the modular splicing fence of the present invention. Since the explosion-proof performance of the explosion-proof blanket is mainly reflected in its inner fence, the inner fence adopts the structure of the present invention, and the outer fence can adopt the structure of the present invention, or a traditional integrated structure or other structures. The outer fence can adopt the hierarchical structure designed by the present invention, and can also adopt the traditional hierarchical structure or other structures. This embodiment is mainly described by taking the inner fence as an example.

The modular splicing fence of the present invention is shown in FIG. 3 and is formed by splicing 6 single-module structures. The diameter of the overall fence is 200-500mm and the height is 200-400mm. The single-module structure is shown in Figure 2, which is 1/6 of the overall fence. One end of the single-module structure is raised, the length of the protrusion is 1/4-1/3 of the length of the single-module structure, and the thickness is 1/4 of the width of the single-module structure. 1/4-1/3, and the other end is provided with a groove matching the protrusion; the adjacent single-module structures are spliced together through the protrusion and groove, and finally form the inner fence of the ring.

The single-module structure is made of flexible bulletproof material, and the single-module structure includes a flexible bulletproof layer 3.3, a support layer 3.4 and an elastic layer 3.5; wherein, the elastic layer 3.5 is arranged on the inner side of the single-module structure and has a certain elasticity. When the penetrating elastic layer is embedded into the bulletproof layer, the elastic layer has a certain degree of shrinkage to prevent the fragments from rebounding and bouncing up under the action of explosive products to cause damage; the elastic layer 3.5 can be made of elastic materials such as rubber, polyurea, and polyurethane elastomer. The bulletproof layer 3.3 is used to prevent the damage to the internal support layer caused by the fragments during an explosion, and can be made of bulletproof PE fiber, aramid fiber, PBO fiber, and high-strength glass fiber. One or more mixed woven bulletproof fiber materials can be used. The support layer 3.4 is used for the support of the overall structure, and can be made of non-metallic materials with a certain degree of flexibility (it can be bent, but the upper and lower directions are hard), such as PC boards, PP boards, etc. The board is sprayed with 1-2mm polyurea to prevent the PC board from shattering and hurting people when it explodes.

When the fragment scatters and penetrates into the fence under the action of the explosion impact, the elastic layer shrinks, and the fragment is embedded in it, so as to prevent the fragment from being continuously loaded by the detonation products after rebounding. The single-module structure has certain elasticity and can be deformed to a certain extent. Therefore, the inner diameter of the fence can be changed within a certain range by changing the number of splices of the single-module structure. Figure 3(a) is a fence formed by splicing 6 single-module structures, and Figure 3(b) is a fence formed by splicing 8 pieces of the same single-module structure.

Further, in this embodiment, the single-module structure is improved to further improve its elasticity and the performance of fire-proof, shock-proof and anti-fragmentation. The module structure consists of support layer 3.4, bulletproof layer 3.3, elastic layer 3.5, fireproof layer 3.2 and outer packaging 3.1 from the inside to the outside; among them, the support layer 3.4 and the bulletproof layer 3.3 can be arranged in multiple layers in a staggered manner to improve the bulletproof capability of the single module structure and structural strength.

Among them, the outer packaging 3.1 is made of materials with waterproof function and certain structural strength, which are used for waterproofing, anti-ultraviolet rays, and preventing tearing by ordinary external forces, etc., to protect the internal structure and improve the internal life; waterproofing is to prevent the internal structure from reacting with water. The explosion-proof performance of the equipment; the strength is high, which can meet the general mechanical properties and protect other layers inside it. The outer packaging 3.1 can be made of waterproof oxford cloth, waterproof canvas, etc. In this embodiment, waterproof oxford cloth is used.

The fireproof layer 3.2 is used to prevent the flame from burning the inner bulletproof layer during an explosion. In this embodiment, a double-layer fireproof cloth is used.

When making a single-module structure, firstly, the bulletproof layers such as PE are sewn together by PE thread or glued together. In this embodiment, there are three bulletproof layers, and the number of each layer is 30-60 layers. After the bonding is completed, the bulletproof layer is bonded to the support layer in sequence, that is, the bulletproof layer - the support layer - the bulletproof layer - the support layer - the bulletproof layer - the support layer, and then the elastic layer is bonded on the innermost support layer. After wrapping with fireproof cloth, it is finally sealed with waterproof Oxford cloth.

In order to further strengthen the structural strength of the modular spliced fence, a belt 2 can be wrapped around the spliced fence for binding. The belt is shown in Figure 4, and the width of the belt is more than 2/3 of the height of the fence. The belt 2 is made of bulletproof material, such as one or more mixed woven materials of bulletproof PE fiber, aramid fiber, PBO fiber, and high-strength glass fiber. Velcro can be arranged on the outer surface of the single-module structure and the inner surface of the belt, and the belt can be pasted on the fence and tightened through the Velcro.

Analysis of the explosion-proof principle of the modular spliced fence of the present invention: in the process of explosion, the time of acting on the inner fence is at the level of ^10-4 seconds, while the deformation and tearing of the single-module structure is at the level of ^10-3 , that is, in the single-module structure Before the large deformation occurs, the fragments have been embedded into the single-module structure. After the fragments are embedded, the fragments will not damage the surrounding people and objects. Therefore, the connection between the single-module structures does not need to consider the issue of strength too much, and it can ensure that they will not be scattered during assembly. The modules are further connected through the straps, and the straps are knotted to ensure that the structure is safe during transportation. completeness.

In the process of explosion, the speed of fragments and shock waves are all above 1000m/s, and the time to act on the explosion-proof structure is extremely short, generally within 1ms. If the fragments generated by the explosion are intercepted within this time, it can be guaranteed Even if the structure disintegrates afterwards, it will not cause great harm to the surrounding people or things.

Further description is given below in conjunction with the simulation calculation of an embodiment:

The bulletproof layer adopts 3 layers of bulletproof structure, each layer uses 40 layers of PE, the support layer adopts 2mm PC board, the surface is sprayed with 1.5mm polyurea, and the elastic layer adopts polyurethane elastomer, which is prepared into a single module structure. The inner fence of the explosion-proof blanket is spliced with 6 single-module structures, and the inner diameter of the inner fence is 400mm. A 6-module inner fence structure is established through simulation, and 62g TNT equivalent explosives are placed in the middle position for simulation testing, and 3 steel ball fragments with a diameter of 4mm are placed next to the TNT. The simulation results are shown in Figures 5 to 8. It can be seen that the time for the shock wave to reach the inner fence is 8E-5s, and the time for the fragments to reach the inner fence is 2E-4s. At this moment, the inner fence has not undergone obvious deformation, and the fragments will continue to penetrate the inner fence and be embedded in the inner fence. in the fence. The overall structure of the inner fence begins to have a certain displacement at 1ms, and at this time, the fragments have been embedded in the inner fence, and no rebound occurs, so even if the equipment is disassembled, it can prevent the damage of high-speed fragments.

是为对比距离，w是炸药质量，r为距离爆炸中心的距离，P为冲击波超压。For a conventional grenade, the internal charge is 62g TNT and the overall mass is 260g. For the protection of shock waves, the damage limit of shock waves according to the human body is about 0.03Mpa. According to the national defense design engineering specification, the shock wave pressure at 2.2m will not cause fatal damage to the human body.

is the comparison distance, w is the mass of the explosive, r is the distance from the explosion center, and P is the shock wave overpressure.

When the TNT equivalent is reduced, the disintegration time of its structure becomes longer, and the equipment is more reliable.

Generally, the velocity of the fragments is calculated using the Gurney formula. Among them, D is the detonation velocity of the explosive. For the TNT charge, the detonation velocity is 6640 m/s, and α is the charging ratio of the explosive, which is the ratio of the mass of the explosive to the overall mass. Then the average velocity of the fragments is:

The reference inner diameter is 400mm, the time for the fragments to reach the protective equipment is:

Through theoretical analysis, it can be seen that the fragments reach the protective equipment in 0.1ms. At this time, the structure will not disintegrate immediately under the action of the shock wave and wait for the fragments to be embedded before the structure disintegrates. The protective equipment can effectively protect against the fragments.

Another single-module structure made of the same size and material, using 8 splices, the inside of the fence becomes 530mm, and the inner diameter increases, which can effectively handle explosives with larger outer packaging volumes. It can be seen from this that the modular splicing fence of the present invention can effectively prevent the damage of fragments. Moreover, when the fence is not in use, it can be disassembled into a single-module structure at ordinary times, which is convenient for storage and transportation, and can be quickly spliced when in use.

The present invention also provides an adjustable explosion-proof blanket, including an inner fence, an outer fence and a blanket, as shown in FIG. 1 , wherein the inner fence adopts the above-mentioned modular splicing fence, and the outer fence can adopt the above-mentioned modular splicing fence , can also use the traditional one-piece fence. When using the above-mentioned explosion-proof blanket to set the explosives, firstly, the single-module structure is spliced to form an inner fence, and then the belt is used to wrap and lock it. The spliced inner fence is surrounded by explosives, and the same method is used to assemble an outer fence, or an integrated outer fence is used, and the outer fence is placed outside the inner fence, and finally covered with a blanket, that is, the explosives are finished temporary disposal.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A modularized spliced fence is characterized in that the fence is formed by splicing a plurality of same single module structures; the single module structure comprises an elastic layer (3.5), a plurality of bulletproof layers (3.3) and a supporting layer (3.4); the bulletproof layer (3.3) is made of one or more bulletproof fiber materials which are woven by mixing of bulletproof PE fibers, aramid fibers, PBO fibers and high-strength glass fibers and is used for preventing fragment damage during explosion; the support layer (3.4) adopts a PC plate, and 1-2mm of polyurea is sprayed on the surface of the PC plate and is used for supporting the whole structure; the elastic layer (3.5) is made of rubber or polyurethane elastomer and is arranged on the inner side of the single module structure to prevent fragment rebound; the supporting layers (3.4) and the bulletproof layers (3.3) are arranged in a staggered mode in sequence; one end of the single-module structure is protruded, the length of the protrusion is 1/4-1/3 of the length of the single-module structure, the width of the protrusion is 1/4-1/3 of the width of the single-module structure, and the other end of the single-module structure is provided with a groove matched with the protrusion; the adjacent single module structures are spliced together only through the bulges and the grooves to form the circular ring-shaped fence.

2. The modular sectional fence according to claim 1, characterized in that the elastic layer (3.5) is polyurea.

3. The modular split rail according to claim 1, wherein the single modular structure further comprises a fire resistant layer (3.2) and an outer package (3.1), wherein the fire resistant layer (3.2) is wrapped outside the bulletproof layer, the supporting layer and the elastic layer for preventing the fire of the inner structure when the fire breaks; the outer packaging (3.1) is intended to be waterproof and to provide protection.

4. The modular sectional fence according to claim 3, characterized in that the outer package (3.1) is made of waterproof oxford; the fireproof layer (3.2) adopts double-layer fireproof cloth.

5. The modular split rail of any of claims 1-4, further comprising a strap wrapped around the outer surface of the rail for tightening the rail; the width of the strap is above 2/3 of the fence height.

6. The modular split fence of claim 5, wherein said straps are made of one or more fiber materials selected from the group consisting of ballistic PE fiber, aramid fiber, PBO fiber, and high strength glass fiber.

7. The modular sectional surround of claim 5, wherein the strap is adhered to the surround outer surface by hook and loop fasteners and tightened.

8. An adjustable explosion-proof blanket, comprising an inner fence, an outer fence and a blanket, wherein the inner fence is a modular spliced fence as claimed in any one of claims 1 to 7.

9. The adjustable explosion proof blanket of claim 8, wherein the peripheral rail is a modular split rail as defined in any one of claims 1-7.

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