Precise parachute-free air-drop and basic material preparation process

Abstract

The invention discloses an accurate parachute-free air-drop and basic material preparation process, an air-drop basic material is an ultra-high molecular weight polyethylene composite material, the air-drop specifically comprises a vertically placed air-drop bag body, and longitudinal and transverse reinforcing bands which are arranged in a crossed manner are sewn on the outer part of the air-drop bag body; an orientation system is arranged on the outer wall of the air-drop bag body and comprises a plurality of air blowing pockets which are uniformly sewn along the circumference of the air-drop bag body; a buffering packaging system formed by combining a soft buffering cushion, a hard buffering cushion and a buffering cushion sleeve is sewn below the air-drop bag body, the soft buffering cushion and the hard buffering cushion are installed in the buffering cushion sleeve, and the hard buffering cushion is located below the soft buffering cushion. A micro receiver used for receiving satellite signals is placed in the air-drop bag body. The problems of material, orientation and buffering can be solved at the same time, the bag body material is wear-resistant and impact-resistant enough, it can be guaranteed that the bag body cannot roll up and down at will, it can be guaranteed that air-dropped materials are intact through buffering, and umbrella-free accurate air-dropped is achieved.

Description

Technical Field

[0001] The invention relates to a precise parachute-free airdrop and basic material preparation process, belonging to the technical field of emergency rescue and air transportation materials. Background Art

[0002] Airdrop is a method of vertically supporting military equipment during wartime. It not only reduces the amount of cargo a unit must carry, but also allows for timely replenishment of frontline equipment and supplies to meet operational needs. It is also a crucial method for emergency rescue. Non-parachute airdrop, which involves dropping equipment and supplies without parachutes, offers advantages such as simple packaging, minimal weather impact, minimal landing dispersion, low cost, and high utilization rates. It is a research area of ​​widespread interest worldwide.

[0003] At present, the practice of parachute-free airdrop still has the following technical problems: The airdrop will tumble during the release process, which not only affects the accuracy of the airdrop, but also makes the airdropped materials unable to be effectively protected; When an airdrop impacts the ground, the airbag at the bottom of the airdrop experiences drastic internal pressure fluctuations. During the cushioning process, the internal pressure of the airbag drops rapidly as the gas is expelled, making it difficult to maintain maximum pressure for a long time. This makes it impossible to effectively absorb and disperse the impact energy and protect the cushioned object from damage. Airdrops are restricted by existing material technology, and there is much room for improvement in their wear resistance and impact resistance.

[0004] In summary, if we want to vigorously develop parachuteless airdrop technology, we must overcome these three key difficulties to achieve true parachuteless precision airdrop. Summary of the Invention

[0005] In response to the deficiencies in the background technology, the present invention provides a precise parachute-free airdrop and basic material preparation process, which can simultaneously solve the material, orientation and cushioning problems. The bag material is sufficiently wear-resistant and impact-resistant, which can not only ensure that the bag will not roll up and down at will, but also ensure the integrity of the airdropped materials through cushioning, thereby realizing precise parachute-free airdrop.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A precise parachute-free airdrop, the basic material of which is ultra-high molecular weight polyethylene composite material. The airdrop specifically includes a vertically placed airdrop bag body, the outside of which is sewn with cross-arranged longitudinal reinforcement belts and transverse reinforcement belts, an orientation system is provided on the outer wall of the airdrop bag body, a cushioning packaging system is sewn under the airdrop bag body, and a micro receiver for receiving satellite signals is placed inside the airdrop bag body.

[0007] Furthermore, the directional system includes a plurality of air hoods, which are evenly sewn on the outer wall of the airdrop bag along the circumference of the airdrop bag, and an escape channel is provided between adjacent air hoods; A cavity is provided inside the air hood, an opening is provided at the bottom of the cavity, and the size of the cavity is designed to be gradually reduced from bottom to top.

[0008] Furthermore, the cushioning packaging system is a cushioning air cushion, which is composed of a soft cushioning pad, a hard cushioning pad and a cushioning pad cover. The soft cushioning pad and the hard cushioning pad are installed in the cushioning pad cover, and the hard cushioning pad is located below the soft cushioning pad.

[0009] Furthermore, the bottom of the cushion cover is provided with a plurality of evenly distributed air inlet holes, and the air inlet holes are circular in structure.

[0010] Furthermore, a plurality of exhaust holes distributed in a circumference are opened transversely on the side surface of the cushion cover, the exhaust holes are in a rectangular structure along the longitudinal direction, and the exhaust holes are connected to the soft cushion.

[0011] Furthermore, Velcro is sewn on the outside of the exhaust hole in a one-to-one correspondence therewith, and is sealed by the Velcro. The left side of the Velcro is sewn to the buffer pad cover, and the right side of the Velcro is always kept in a movable and openable adhesive state.

[0012] Furthermore, the transverse reinforcement belt and the longitudinal reinforcement belt are cross-sewn, and the transverse reinforcement belt is sewn in the middle position of the airdrop bag body; there are two longitudinal reinforcement belts, which are cross-connected at the bottom of the airdrop bag body, and the tops of the longitudinal reinforcement belts extend out of the airdrop bag body and are connected in pairs.

[0013] A process for preparing basic materials for precise parachuteless airdrop, wherein the basic materials for precise parachuteless airdrop are ultra-high molecular weight polyethylene composite materials.

[0014] The raw materials for preparing the ultra-high molecular weight polyethylene composite material include, by weight, 45-80 parts of ethylene, 2-8 parts of catalyst, 3-8 parts of initiator, 40-60 parts of dispersion medium solvent, 3-6 parts of dicumyl peroxide, and 10-20 parts of anhydrous ethanol; The catalyst is a mixture of one or more compounds such as TiCl4, TiBr4, triethylaluminum, diethylaluminum chloride, etc.; The initiator is a mixture of one or more of dibenzoyl peroxide, methyl ethyl ketone peroxide, and azobisisobutyronitrile; The dispersion medium solvent is one or more mixtures of n-hexane, isohexane, hexane oil or solvent oil.

[0015] Furthermore, the preparation process of the ultra-high molecular weight polyethylene composite material is as follows: Pour the mixture of ethylene, catalyst, initiator and dispersion medium into a kettle polymerization reactor, set the temperature to 60-120°C, the pressure to 1-2.5 Pa, and the speed to 2000-2600 rpm; Hydrogen is introduced to control the molecular weight of the polymer, and the gas pressure is controlled at 0.5-0.6Mpa; After the reaction is completed, ultra-high molecular weight polyethylene is obtained; After the ultra-high molecular weight polyethylene is dried, dicumyl peroxide and anhydrous ethanol are added to the mixture, heated and stirred, and the heating, pressing and drying are repeated to obtain an ultra-high molecular weight polyethylene composite material.

[0016] After adopting the above technical solution, the present invention has the following advantages compared with the prior art: The present invention combines directional technology, cushioning packaging technology and tracking recovery technology to achieve parachute-free precise airdrop. The directional technology adopted by the present invention is the air scoop. The present invention fully considers the aerodynamic characteristics in the shape and structure design. By adding a number of air scoops laterally on the bag body, the air scoops play a directional role, preventing the bag from turning upside down, and effectively ensuring the integrity of the airdropped materials. The cushioning packaging technology used in this invention, namely the cushioning air cushion, uses the working principle of an exhaust airbag. It first absorbs energy during the bag's descent. When the energy reaches its peak during impact, the exhaust port opens and exhausts air outward until it is completely deflated. By using this technology, the purpose of cushioning and deceleration is achieved. This energy conversion and release process can effectively absorb and disperse impact energy, protecting the cushioned object from damage. In most cases, the energy can be fully released in one go, reducing damage to supplies caused by bouncing and other uncertain postures, which is of great significance for protecting airdropped supplies. The tracking and recovery technology adopted by the present invention is the Beidou satellite navigation system, which calculates the position of the airdrop bag through pseudo-range measurement, facilitates recycling and reuse, saves costs, and effectively avoids environmental pollution; The airdrop bag of this invention is made from an ultra-high molecular weight polyethylene composite material, a further optimization of ultra-high molecular weight polyethylene. It has the characteristics of ultra-high wear resistance, ultra-high corrosion resistance, extremely low friction coefficient, impact resistance, and aging resistance. It is more wear-resistant and impact-resistant than other airdrop bags on the market.

[0017] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural stereogram of the parachute-free airdrop system of the present invention; Figure 2 This is a structural stereogram of the parachute-free airdrop of the present invention taken in another direction; Figure 3 This is a front view of the structure of the parachute-free airdrop system of the present invention; Figure 4 This is a structural perspective diagram of the cushioning air cushion of the present invention; Figure 5 It is a structural cross-sectional view of the buffer air cushion in the present invention.

[0019] In the figure, 1-airdrop bag body; 2-air hood, 21-opening; 3-longitudinal reinforcement belt; 4-transverse reinforcement belt; 5-buffer air cushion, 51-soft buffer cushion, 52-hard buffer cushion, 53-buffer cushion cover, 54-exhaust hole, 55-air inlet hole. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0021] Example 1 like Figure 1-Figure 5 As shown together, the present invention provides a precise parachute-free airdrop. The basic material of the airdrop is an ultra-high molecular weight polyethylene composite material. The airdrop specifically includes a vertically placed airdrop bag body 1. The outside of the airdrop bag body 1 is sewn with cross-arranged longitudinal reinforcement belts 3 and transverse reinforcement belts 4. A directional system is provided on the outer wall of the airdrop bag body 1. A cushioning packaging system is sewn under the airdrop bag body 1. A miniature receiver for receiving satellite signals is placed inside the airdrop bag body 1.

[0022] The top of the airdrop bag body 1 is provided with a tie opening, through which basic rescue supplies are placed into the airdrop bag body 1.

[0023] The directional system includes multiple air hoods 2, which are evenly sewn on the outer wall of the airdrop bag body 1 along the circumference thereof. Avoidance channels are provided between adjacent air hoods 2, and the avoidance channels are used to avoid the longitudinal reinforcement belt 3.

[0024] The air hood 2 has a cavity inside, and an opening 21 is provided at the bottom of the cavity. The size of the cavity is designed to be gradually reduced from bottom to top.

[0025] The air hood 2 can play a directional role as the airdrop bag body 1 descends, preventing the airdrop bag body 1 from turning upside down, effectively ensuring the accuracy of the airdrop and the protection of the airdrop materials.

[0026] The cushioning packaging system is a cushioning air cushion 5 , which is composed of a soft cushioning pad 51 , a hard cushioning pad 52 and a cushioning pad cover 53 . The soft cushioning pad 51 and the hard cushioning pad 52 are installed in the cushioning pad cover 53 , and the hard cushioning pad 52 is located below the soft cushioning pad 51 .

[0027] The bottom of the cushion cover 53 is provided with a plurality of air inlet holes 55 evenly distributed, and the air inlet holes 55 are circular in structure. Air can be inflated into the soft cushion 51 through the air inlet holes 55 .

[0028] The side surface of the cushion cover 53 is provided with a plurality of vent holes 54 distributed in a circumferential manner. The vent holes 54 are in a rectangular structure along the longitudinal direction. The vent holes 54 are connected to the soft cushion 51 .

[0029] The vent holes 54 are sealed with Velcro strips, each corresponding to the other. The left side of the Velcro strip is sewn to the cushion cover 53, while the right side remains in a removable, openable, and attached position. The Velcro strips control the exhaust process after the airdropped device touches the ground. When the airdropped device touches the ground, the pressure on the Velcro strips expands, allowing for exhaust. The air intake holes below also assist in exhaust. The transverse reinforcement strips 4 and longitudinal reinforcement strips 3 are cross-sewn to reinforce the entire airdrop bag 1.

[0030] The transverse reinforcement belt 4 is sewn at the middle position of the airdrop bag body 1.

[0031] There are two longitudinal reinforcement belts 3, which are cross-connected at the bottom of the airdrop bag body 1. The tops of the longitudinal reinforcement belts 3 extend out of the airdrop bag body 1 and are connected in pairs, which is convenient for spring hook bundling and hanging.

[0032] The present invention utilizes tracking and recovery technology, namely the Beidou satellite navigation system, to calculate the position of the airdrop bag through pseudo-range measurement, making it convenient for recycling and reuse, saving costs and effectively avoiding environmental pollution.

[0033] During the release and descent of a parachute-free airdrop, several air scoops are added laterally to the bag. These scoops provide a directional orientation, preventing the bag from tipping over and effectively protecting the airdropped materials. During the release and descent of a parachute-free airdrop, gas enters the soft cushioning pad through the lower air inlet until it is completely filled, preventing further gas from entering. When the airdrop impacts the ground, the cushioning pad is squeezed. When the gas inside is compressed to a predetermined pressure or the payload reaches a predetermined overload, the gas pushes the Velcro apart, opening the vents for exhaust. The four lower air inlets coordinate exhaust, maintaining the exhaust process until it is complete.

[0034] During the implementation of this embodiment, the target point is set as the center, and a circle with a radius of ten meters is made, and the area within the circle is the target area. The airdrop bag is carried by an aircraft and hovers in the air 200 meters away from the ground target area, and is released. Through remote observation by the drone, the airdrop bag without an umbrella is inflated during the landing process, and finally ensures that the airdrop bag lands in a preset posture. According to the positioning display of the Beidou satellite navigation system, the airdrop bag lands on the ground target area, and after contacting the ground target area, it buffers once without rebounding, and the straight-line distance from the target point is 4.1 meters. The experimental process is repeated 10 times. The bag body is not damaged, and there are slight scratches on the bottom of the bag body, which can be reused.

[0035] Example 2 The present invention provides a process for preparing basic materials for precise parachuteless airdrop. Basic materials such as airdrop bags, cushioning air cushions, and reinforcement belts used in parachuteless airdrop are all ultra-high molecular weight polyethylene composite materials.

[0036] The raw materials for preparing the ultra-high molecular weight polyethylene composite material include, by weight, 45-80 parts of ethylene, 2-8 parts of catalyst, 3-8 parts of initiator, 40-60 parts of dispersion medium solvent, 3-6 parts of dicumyl peroxide (DCP), and 10-20 parts of anhydrous ethanol; The catalyst is a mixture of one or more compounds such as TiCl4, TiBr4, triethylaluminum, diethylaluminum chloride, etc.; The initiator is a mixture of one or more of dibenzoyl peroxide (BPO), methyl ethyl ketone peroxide (MEKPO), and azobisisobutyronitrile (AIBN); The dispersion medium solvent is one or more mixtures of n-hexane, isohexane, hexane oil or solvent oil.

[0037] The preparation process of ultra-high molecular weight polyethylene composite materials is as follows: Pour the mixture of ethylene, catalyst, initiator and dispersion medium into a kettle polymerization reactor, set the temperature to 60-120°C, the pressure to 1-2.5 Pa, and the speed to 2000-2600 rpm; Hydrogen is introduced to control the molecular weight of the polymer, and the gas pressure is controlled at 0.5-0.6Mpa; After the reaction is completed, ultra-high molecular weight polyethylene (UHMWPE) is obtained; After ultra-high molecular weight polyethylene (UHMWPE) is dried, dicumyl peroxide and anhydrous ethanol are added, heated and stirred, and the heating, pressing and drying are repeated to obtain an ultra-high molecular weight polyethylene composite material.

[0038] The parachute-free airdrop uses the ultra-high molecular weight polyethylene composite material prepared by the above process as the basic material, which is a further optimization of ultra-high molecular weight polyethylene. It has the characteristics of ultra-high wear resistance, ultra-high corrosion resistance, extremely low friction coefficient, impact resistance, and aging resistance.

[0039] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the basic material of the airdrop in Comparative Example 1 is polyamide fiber, while the basic material of the airdrop in Example 1 is ultra-high molecular weight polyethylene composite material, and the rest of the structures are the same.

[0040] During the implementation of Comparative Example 1, a circle with a radius of ten meters was constructed, centered at the target point. The airdrop bag was then mounted on an aircraft and hovered 200 meters above the ground target area before being released. Remote drone observation revealed that the airdrop bag's circumference inflated during descent, ultimately ensuring it landed in the desired position. Positioning by the Beidou satellite navigation system indicated that the bag landed within the ground target area, cushioned once upon contact without rebound, and reached a straight-line distance of 5.8 meters from the target point. After repeating the experimental process ten times, the bag sustained numerous scratches and significant damage to its bottom, rendering it unusable.

[0041] Comparative Example 2 In Comparative Example 2, the basic material for airdrop is an ultra-high molecular weight polyethylene composite material. The difference between Comparative Example 2 and Example 1 is that Comparative Example 2 does not add an air hood, while Example 1 adds an air hood, and the rest of the structures are the same.

[0042] During the implementation of Comparative Example 2, a circle with a radius of ten meters was constructed, centered at the target point. The airdrop bag was then released from an aircraft, hovering 200 meters above the ground target area. Remote drone observation revealed that the parachute-less airdrop bag erratically flipped up and down during descent. Beidou satellite navigation system positioning indicated that the bag initially landed in the ground target area, but because it failed to land in the desired position, it rolled out after contacting the target area, ultimately landing outside the target area. The relief supplies within the bag suffered varying degrees of damage.

[0043] The foregoing is an example of the best mode of carrying out the present invention. Any portion not described in detail herein is common knowledge within the skill of one of ordinary skill in the art. The scope of protection of the present invention is determined by the claims. Any equivalent transformation based on the technical teachings of the present invention is also within the scope of protection of the present invention.

Claims

1. A precise parachute-free airdrop, characterized in that: The basic material of the airdrop is an ultra-high molecular weight polyethylene composite material. The airdrop specifically comprises an airdrop bag body (1) placed vertically, the airdrop bag body (1) is sewn with cross-arranged longitudinal reinforcement belts (3) and transverse reinforcement belts (4) on the outside, an orientation system is arranged on the outer wall of the airdrop bag body (1), a cushioning packaging system is sewn under the airdrop bag body (1), and a micro-receiver for receiving satellite signals is placed inside the airdrop bag body (1).

2. The precise parachute-free airdrop according to claim 1, characterized in that: The directional system comprises a plurality of air blowing hoods (2), wherein the plurality of air blowing hoods (2) are evenly sewn along the circumference of the airdrop bag body (1) on the upper part of its outer wall, and an escape channel is provided between adjacent air blowing hoods (2); The air blowing hood (2) is provided with a cavity inside, and an opening (21) is provided at the bottom of the cavity. The size of the cavity is designed to be gradually reduced from bottom to top.

3. The precise parachute-free airdrop according to claim 1, characterized in that: The cushioning packaging system is a cushioning air cushion (5), the cushioning air cushion (5) being composed of a soft cushioning cushion (51), a hard cushioning cushion (52) and a cushioning cushion cover (53), the soft cushioning cushion (51) and the hard cushioning cushion (52) being installed in the cushioning cushion cover (53), and the hard cushioning cushion (52) being located below the soft cushioning cushion (51).

4. The precise parachute-free airdrop according to claim 3, characterized in that: The bottom of the cushion cover (53) is provided with a plurality of evenly distributed air inlet holes (55), and the air inlet holes (55) are of a circular structure.

5. The precise parachute-free airdrop according to claim 4, characterized in that: A plurality of exhaust holes (54) distributed in a circumferential manner are transversely opened on the side surface of the cushion cover (53); the exhaust holes (54) are in a rectangular structure along the longitudinal direction; and the exhaust holes (54) are arranged in communication with the soft cushion (51).

6. The precise parachute-free airdrop according to claim 5, characterized in that: The exhaust holes (54) are sewn with Velcro tapes corresponding to each other on the outside, and the Velcro tapes are used for sealing. The left side of the Velcro tapes is sewn to the cushion cover (53), and the right side of the Velcro tapes is always kept in a movable and openable adhesive state.

7. The precise parachute-free airdrop according to claim 1, characterized in that: The transverse reinforcement belt (4) and the longitudinal reinforcement belt (3) are cross-sewn, and the transverse reinforcement belt (4) is sewn at the middle position of the airdrop bag body (1); the number of the longitudinal reinforcement belts (3) is two, and the two longitudinal reinforcement belts (3) are cross-connected at the bottom of the airdrop bag body (1), and the tops of the longitudinal reinforcement belts (3) extend out of the airdrop bag body (1) and are connected in pairs.

8. A process for preparing basic materials for precise parachute-free airdrop, characterized in that: The basic material for parachute-free airdrop is ultra-high molecular weight polyethylene composite material.

9. A process for preparing basic materials for precise parachute-free airdrop according to claim 8, characterized in that: The raw materials for preparing the ultra-high molecular weight polyethylene composite material include, by weight, 45-80 parts of ethylene, 2-8 parts of catalyst, 3-8 parts of initiator, 40-60 parts of dispersion medium solvent, 3-6 parts of dicumyl peroxide, and 10-20 parts of anhydrous ethanol; The catalyst is a mixture of one or more compounds such as TiCl4, TiBr4, triethylaluminum, diethylaluminum chloride, etc.; The initiator is a mixture of one or more of dibenzoyl peroxide, methyl ethyl ketone peroxide and azobisisobutyronitrile; The dispersion medium solvent is one or more mixtures of normal hexane, isohexane, hexane oil or solvent oil.

10. A process for preparing basic materials for precise parachute-free airdrop according to claim 9, characterized in that: The preparation process of ultra-high molecular weight polyethylene composite materials is as follows: Mix ethylene, catalyst, initiator and dispersion medium solvent and pour them into a kettle polymerization reactor. Set the temperature to 60-120°C, the pressure to 1-2.5 Pa and the speed to 2000-2600 rpm. Hydrogen is introduced to control the molecular weight of the polymer, and the gas pressure is controlled to be 0.5-0.6Mpa; After the reaction is completed, ultra-high molecular weight polyethylene is obtained; After the ultra-high molecular weight polyethylene is dried, dicumyl peroxide and anhydrous ethanol are added to heat and stir, and the heating, pressing and drying are repeated to obtain an ultra-high molecular weight polyethylene composite material.

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