CN217946190U - For military use type air-drop box of lightweight no umbrella - Google Patents
For military use type air-drop box of lightweight no umbrella Download PDFInfo
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Abstract
The utility model discloses a for military use type air-drop case of lightweight does not have umbrella, the box of air-drop case is composite bed structure, including sealing layer and the enhancement layer that from interior to exterior set gradually, the enhancement layer includes a plurality of layers of A layer and a plurality of layers of B layer, is provided with the B layer between the adjacent two-layer A layer. The utility model provides a for military use type air-drop box of lightweight does not have umbrella, obtain the sealing layer through blow molding, the leakproofness of air-drop box has been improved, the sealing layer adopts high density polyethylene to make, improve the oil resistance of air-drop box, chemical stability etc., improve the intensity of air-drop box through setting up the enhancement layer, fall-resistant nature, toughness etc., satisfy lightweight design demand simultaneously, comprehensive properties is good, more be fit for high altitude air-drop and use, the ingenious problem of having solved current air-drop box existence, reached the lightweight, need not to carry the parachute, high strength, fall-resistant, easy location, but high altitude construction's purpose, the service condition of air-drop box has been widened, and is low in cost, superior performance, and the industrial popularization and use is suitable.
Description
Technical Field
The utility model belongs to the technical field of for military use material, concretely relates to for military use type air-drop box of lightweight does not have umbrella.
Background
The air-drop box plays a huge role in emergency rescue, and materials are air-dropped through the air-drop box, so that the rescue requirement can be quickly responded, and precious time is strived for rescue. However, the existing air-drop box is mostly made of metal, the weight of the air-drop box is high, the air-drop box is inconvenient to carry and use, a parachute is often required to be carried to guarantee the air-drop box to stably fall to the ground, the influence of weather and wind power is large, materials cannot be delivered at fixed points, and meanwhile the difficulty of emergency rescue is greatly increased. Although some air-drop boxes are plastic shock absorption boxes, the air-drop box is suitable for air-drop in low altitude within 10 meters, the box body is easy to crack in high altitude air-drop, and the falling resistance is poor and the limitation is large.
Chinese patent, grant publication No. CN215155688 discloses a big load unmanned aerial vehicle air-drop case, improves the shock attenuation effect of air-drop case through increasing pulley and spring, but its body lacks better resistant falling nature and crashproof nature, and pulley and spring easily harm, are unfavorable for using repeatedly, and the design is complicated, are unfavorable for industrial production.
Chinese patent, grant publication No. CN215323897 discloses an ultra-high molecular weight polyethylene air-drop box, though the problem that metal air-drop boxes are heavy and difficult to transport and use is solved, such air-drop boxes are not resistant to falling and impact, and still need to use a parachute to ensure stable delivery of the box, and the use of the parachute can lead to inaccurate drop location and is susceptible to weather.
Chinese patent, publication No. CN110760119, discloses a rotational molding air-drop box and a preparation method thereof, the problem of heavy dead weight of a metal air-drop box is well solved by the air-drop box prepared from modified plastics, but the air-drop box has low strength, is only suitable for air-drop under ultra-low altitude within 10 meters, has harsh use conditions and is not suitable for high-altitude operation.
SUMMERY OF THE UTILITY MODEL
For the air-drop box that solves existence among the prior art is difficult for the transport, need carry the parachute, the location is difficult, easily break technical problem such as, the utility model aims to provide a lightweight does not have for military use type air-drop box of umbrella.
In order to realize the above purpose, reach above-mentioned technological effect, the utility model discloses a technical scheme be:
the utility model provides a lightweight does not have umbrella military type air-drop box, the box of air-drop box is composite layer structure, includes sealing layer and the enhancement layer that from inside to outside set gradually, the enhancement layer includes a plurality of layers A layer and a plurality of layers B layer, is provided with at least one deck B layer between the adjacent two-layer A layer.
Further, the mass ratio of the sealing layer to the reinforcing layer is (40-50): (50-60).
Further, the mass ratio of the layer A to the layer B is (5-40): (60-95).
Further, the layer A is provided with at least 2 layers, and the layer B is provided with at least one layer.
Further, a layer B is arranged between two adjacent layers A.
Further, the layer A adopts a low-density polyethylene film or a low-density polyethylene sheet.
Further, the layer B is a net-shaped woven cloth woven by flat-wire-shaped or tow-shaped high-density polyethylene fibers.
Furthermore, the sealing layer adopts a high-density polyethylene layer, and the density of the high-density polyethylene layer is 0.94-0.96g/cm 3 。
Further, the thickness of the sealing layer is 2-5 mm.
Further, the thickness of the reinforcing layer is 0.5-10 mm.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a for military use type air-drop case of lightweight does not have umbrella, the box of air-drop case is composite bed structure, including sealing layer and the enhancement layer that from interior to exterior set gradually, the enhancement layer includes a plurality of layers of A layer and a plurality of layers of B layer, is provided with at least one deck B layer between the adjacent two-layer A layer. The utility model provides a lightweight does not have umbrella military use type air-drop box, adopt high density polyethylene to pass through blow molding preparation sealing layer, the leakproofness of air-drop box has been improved, oil resistance, chemical stability etc, adopt high density polyethylene fiber cooperation low density polyethylene film or sheet metal preparation enhancement layer, the intensity of air-drop box has been improved, it is resistant to fall, toughness etc, satisfy lightweight design demand simultaneously, the main material of each layer is the polyethylene material, raw and other materials are with low costs, reach superior performance through PE self-reinforcing, and the material is retrieved conveniently, environmental protection and energy saving more, and simultaneously, because of each layer main material is polyethylene, the adhesion between layer is very good, be a whole after whole product shaping, there is not the incompatible condition of interlayer shrinkage, also can not have the condition that the interlaminar delaminating appears in use because of the difference of the coefficient of expending with heat; the utility model discloses the air-drop case of preparation, comprehensive properties is good, more is fit for the high altitude air-drop and uses, ingenious solution the problem that current air-drop case exists, reached the lightweight, need not to carry parachute, high strength, resistant fall, easily fix a position, but aerial working's purpose, widened the service condition of air-drop case, be fit for the industrialization and use widely.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention is described in detail below to enable the advantages and features of the present invention to be more easily understood by those skilled in the art, thereby making more clear and definite definitions of the scope of the present invention.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
As shown in figure 1, the light-weight umbrella-free military aerial delivery box has a box body of a composite layer structure, and comprises a sealing layer 3 and a reinforcing layer which are sequentially arranged from inside to outside, wherein the mass ratio of the sealing layer 3 to the reinforcing layer is (40-50): (50-60), the enhancement layer comprises a plurality of layers A1 and a plurality of layers B2, at least one layer B2 is arranged between two adjacent layers A1, the sealing layer 3 is connected with the innermost layer A1, and the mass ratio of the layer A1 to the layer B2 is (5-40): (60 to 95), preferably (15 to 40): (60-85).
The A layer 1 is provided with at least 2 layers, the B layer 2 is provided with at least one layer, the B layer 2 is preferably arranged between the two adjacent A layers 1, the structure of the enhancement layer can be ABA, ABABA, ABABABA or the like, and the enhancement layer can be made of a multi-layer structure through a hot pressing process.
The layer A1 is made of a low-density polyethylene film or a low-density polyethylene sheet and can be prepared by casting or hot pressing.
The B layer 2 is a net-shaped woven cloth woven by flat filament or tow-shaped long fibers, preferably a high-density polyethylene fiber woven cloth, and the specification of the B layer can be that continuous fiber yarns of 500-1500Dtex are woven in a plain weave mode or a twill weave mode.
The sealing layer 3 is a high-density polyethylene layer, is formed by blow molding of high-density polyethylene, has good oil resistance, chemical stability and sealing property, and has a density of 0.94-0.96 g/cm 3 The thickness of the sealing layer 3 is 2-5 mm.
The thickness of the reinforced layer is 0.5-10 mm.
The appearance of the air-drop box is a regular and spatially symmetrical structure and is a cuboid, a cube, a cylinder or other regular symmetrical bodies.
A preparation method of a lightweight umbrella-free military aerial delivery box comprises the following steps:
1) Cutting the layer A1 and the layer B2 according to the required size, layering in a multi-layer structure mode of ABA, ABABABA, ABABABABA or the like, shaping the multi-layer structure into a whole composite board in a hot pressing mode to obtain a prefabricated reinforcing layer, wherein the hot pressing temperature is 100-120 ℃, and the hot pressing time is 3-5 min.
2) And (3) customizing a mould according to the product by using a forming machine, heating and pressurizing the prefabricated enhancement layer, and pressing the prefabricated enhancement layer into a semi-finished product of the enhancement layer in the shape of the mould, wherein the temperature range is controlled to be 60-80 ℃, and the time is controlled to be 10-30 s.
3) Preparing an air-drop box finished product through blow molding equipment: the semi-finished product of the reinforcing layer is fixed in a mould of blow molding equipment in advance, then a sealing layer is produced through blow molding, and high-density polyethylene is uniformly distributed in the prefabricated semi-finished product of the reinforcing layer through blow molding, so that the complete air-drop box is prepared, and the blow molding temperature is 180-220 ℃.
Example 1
As shown in figure 1, the box body of the air-drop box is of a composite layer structure and comprises a sealing layer 3 and an enhancement layer which are sequentially arranged from inside to outside, the enhancement layer comprises 3 layers of A layers 1 and 2 layers of B layers 2, and one layer of B layer 2 is arranged between every two adjacent layers of A layers 1.
The layer A1 is made of a low-density polyethylene sheet and can be prepared in a tape casting or hot pressing mode, and the thickness is 0.8mm.
The B layer 2 is a net-shaped woven cloth woven by continuous flat filament-shaped 1000dtex high-density polyethylene fibers, the thickness of the net-shaped woven cloth is 1mm, and the texture of the woven cloth is a plain weave.
A preparation method of a lightweight umbrella-free military airdrop box comprises the following steps:
1) Cutting the layer A1 and the layer B2 according to the required size, layering according to ABABA, shaping the multilayer structure into a whole composite board in a hot pressing mode to obtain a prefabricated reinforcing layer, wherein the hot pressing temperature is 115 ℃, the hot pressing time is 4min, then, carrying out pressure maintaining cooling, the cooling temperature is 40 ℃, the cooling time is 3min, and manufacturing the prefabricated reinforcing layer, wherein the size is 650 x 550mm.
2) Using a forming machine to customize a mould according to a product, heating and pressurizing a prefabricated enhancement layer, pressing the prefabricated enhancement layer into a semi-finished product of the enhancement layer in the shape of the mould, controlling the temperature range at 70 ℃ and the time at 20s, demoulding, taking out the product, cutting, and removing leftover materials to obtain a 460X 370X 85mm semi-finished product;
3) Preparing an air-drop box finished product through blow molding equipment: symmetrically fixing 2 semi-finished products with the size of 460X 370X 85mm in a mould of blow molding equipment, closing the mould, then uniformly beating a high-density polyethylene layer in the semi-finished products through blow molding, wherein the blow molding temperature is 200 ℃, removing leftover materials after mould opening, and preparing complete air-drop box finished products with the size of 460X 370X 170mm.
Example 2
The present example is different from example 1 in that the B layer 2 of the present example is a mesh woven fabric woven from 700dtex high density polyethylene fibers in a continuous filament bundle form, the thickness is 1mm, and the texture of the woven fabric is twill-like.
A preparation method of a lightweight umbrella-free military airdrop box comprises the following steps:
1) Cutting the layer A1 and the layer B2 according to the required size, layering according to ABABA, shaping the multilayer structure into a whole composite board in a hot pressing mode to obtain a prefabricated reinforcing layer, wherein the hot pressing temperature is 120 ℃, the hot pressing time is 4min, then maintaining pressure and cooling, the cooling temperature is 40 ℃, the cooling time is 3min, and the prefabricated reinforcing layer is prepared, and the size is 650 x 550mm.
2) Customizing a mould according to a product by using a forming machine, heating and pressurizing a prefabricated enhancement layer, pressing the prefabricated enhancement layer into a semi-finished product of the enhancement layer in the shape of the mould, controlling the temperature range at 65 ℃ and the time at 25s, demoulding, taking out the product, cutting, removing leftover materials, and preparing a 460X 370X 85mm semi-finished product;
3) Preparing an air-drop box finished product through blow molding equipment: symmetrically fixing 2 semi-finished products with the size of 460X 370X 85mm in a mould of blow molding equipment, closing the mould, then uniformly beating a high-density polyethylene layer in the semi-finished products through blow molding, wherein the blow molding temperature is 200 ℃, removing leftover materials after mould opening, and preparing complete air-drop box finished products with the size of 460X 370X 170mm.
The same as in example 1.
Comparative example 1
This comparative example differs from example 1 in that the B layer 2 of this comparative example uses impact modified high density polyethylene sheet.
The same as in example 1.
Comparative example 2
This comparative example differs from example 1 in that it resulted in a pre-fabricated reinforcement layer with a hot pressing temperature of 140 c and a time of 10min.
The same as in example 1.
Comparative example 3
This comparative example differs from example 1 in that the hot pressing temperature of the preformed reinforcement layer obtained in this comparative example was 80 ℃ and the time was 10min.
The same as in example 1.
Comparative example 4
This comparative example differs from example 1 in that it has no reinforcing layer and is blow molded using only high density polyethylene to make an airdrop box with a sealing layer.
The test mode is as follows:
free fall test: the airdrop boxes prepared in examples 1-2 and comparative examples 1-4 were subjected to a 30-meter free fall test, and the integrity of the boxes after free fall was observed, with the test results shown in table 1.
TABLE 1
The utility model discloses the part or the structure that do not specifically describe adopt prior art or current product can, do not do here and describe repeatedly.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transformation that the content of the specification does, or directly or indirectly use in other related technical fields, all including in the same way the patent protection scope of the present invention.
Claims (10)
1. The utility model provides a for military use type air-drop box of lightweight no umbrella, its characterized in that, the box of air-drop box is composite bed structure, includes sealing layer and the enhancement layer that from interior to exterior set gradually, the enhancement layer includes a plurality of layers A layer and a plurality of layers B layer, is provided with at least one deck B layer between the adjacent two-layer A layer.
2. The lightweight umbrella-free military aerial delivery box of claim 1, wherein the mass ratio of the sealing layer to the reinforcing layer is (40-50): (50-60).
3. The lightweight umbrella-free military airdrop box of claim 1, wherein the mass ratio of the layer a to the layer B is (5-40): (60-95).
4. The lightweight umbrella-free military-type aerial delivery box of claim 1, wherein the a layer is provided with at least 2 layers and the B layer is provided with at least one layer.
5. The lightweight umbrella-free military-type aerial delivery box of claim 1, wherein a layer B is disposed between two adjacent layers a.
6. The airdrop box of claim 1, wherein said layer a is a low density polyethylene film or a low density polyethylene sheet.
7. The lightweight umbrella-free military airdrop box of claim 1, wherein the layer B is a mesh woven fabric woven from high-density polyethylene fibers in the form of flat filaments or tows.
8. The lightweight umbrella-free military airdrop box of claim 1, wherein the sealing layer is a high density polyethylene layer having a density of 0.94-0.96 g/cm 3 。
9. The lightweight umbrella-free military airdrop box of claim 1, wherein the sealing layer has a thickness of 2-5 mm.
10. The lightweight umbrella-free military aerial delivery box of claim 1, wherein the reinforcement layer has a thickness of 0.5 to 10mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222377363.XU CN217946190U (en) | 2022-09-07 | 2022-09-07 | For military use type air-drop box of lightweight no umbrella |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222377363.XU CN217946190U (en) | 2022-09-07 | 2022-09-07 | For military use type air-drop box of lightweight no umbrella |
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| Publication Number | Publication Date |
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| CN217946190U true CN217946190U (en) | 2022-12-02 |
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| CN202222377363.XU Active CN217946190U (en) | 2022-09-07 | 2022-09-07 | For military use type air-drop box of lightweight no umbrella |
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- 2022-09-07 CN CN202222377363.XU patent/CN217946190U/en active Active
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