An ultra-low altitude parachute-free air-drop device

Abstract

The application provides an ultra-low-altitude umbrella-free air-drop device, which comprises a platform, a supporting arm and a foot pad, the platform and the supporting arm are connected through a hinge, and the hinge connection parts of the platform and the supporting arm are respectively provided with a supporting arm driving mechanism and a supporting arm unfolding locking mechanism; the supporting arm is composed of three energy-absorbing modules, the energy-absorbing modules are connected through hinge joints, are mutually parallel and are stacked, the connection parts are provided with a joint driving mechanism and a joint unfolding locking mechanism; the supporting arm is connected with a movable rod of the hinge and can move along the rotating direction of the hinge after the electromagnetic lock is unlocked. The ultra-low-altitude umbrella-free air-drop device has a light overall structure, the carbon fiber material used has small density and high strength, and is convenient to carry; the aluminum honeycomb energy-absorbing material used has small density, large specific energy absorption, and better buffering performance compared with most existing energy-absorbing materials, can effectively absorb the impact of heavy equipment air-drop, and meets the high-structural-integrity requirement of umbrella-free air-drop of heavy equipment.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, specifically to an ultra-low-altitude parachute-free airdrop device. Background Technology

[0002] In recent years, airdrop transport has developed rapidly and been widely used due to its convenience and speed. The delivery of army equipment and supplies has become increasingly reliant on helicopters, mainly employing three methods: parachute airdrop, air assault, and non-parachute airdrop. However, the first two methods have significant drawbacks. Parachute airdrops require a long preparation time, are not timely, and are easily affected by ground environmental factors such as wind force, wind direction, and tall trees. Furthermore, the supplies are scattered over a wide area, making it difficult to quickly concentrate the delivered equipment and supplies into combat effectiveness, and they are easily detected and even attacked by the enemy. Air assault requires high ground conditions, necessitating a certain area of ​​flat and hard ground for the landing. Jungles, deserts, thick snow, swamps, and uneven mountainous terrain are unsuitable for air assaults. Additionally, the delivery time is long, and the risk is high without absolute air superiority.

[0003] Compared to the previous two airdrop methods, parachuteless airdrop has advantages such as shorter preparation time, rapid delivery, less susceptibility to weather conditions, smaller landing dispersion, and reusability. However, current research on parachuteless airdrop mainly focuses on materials with low structural integrity requirements, such as liquids and food, which cannot meet the needs of parachuteless airdrop for large and precision equipment. Based on this, the inventors, building upon their existing patent application (CN113715764A - A collision buffer energy-absorbing device with the combined action of a one-dimensional deployment mechanism and energy-absorbing material), propose an ultra-low-altitude parachuteless airdrop device to solve the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an ultra-low-altitude parachute-free airdrop device. This airdrop device has two states: retracted and locked. When inside a helicopter cabin, the device is fixed to the platform and is in the retracted and locked state to meet the cabin's storage requirements. When the device is pushed out of the cabin and falls to a certain height to begin landing, the support arm extends to the working position and locks. After locking, the energy-absorbing material inside the support arm absorbs the impact energy, achieving a safe landing of the airdrop device.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An ultra-low-altitude parachute-free airdrop device includes a platform, outriggers, and foot pads. The platform and four outriggers are connected via hinges. Each hinge connection between the platform and each outrigger is equipped with an outrigger drive mechanism and an outrigger deployment locking mechanism. Each outrigger consists of three energy-absorbing modules. The connection between the energy-absorbing modules is equipped with an energy-absorbing module drive mechanism and an energy-absorbing module deployment locking mechanism. The outriggers and foot pads are connected via ball joints. Before use, the outriggers are folded up and erected, and the energy-absorbing modules are folded together to form a rectangular body with a shorter length. The rectangular body is oriented in the same direction as the length of the platform. The outriggers and energy-absorbing modules are locked together by electromagnetic locks. The rectangular body formed by the folded energy-absorbing modules is at a certain angle to the interface. During airdrop, the electromagnetic locks are unlocked, the energy-absorbing modules are deployed and locked into a straight line, and the outriggers are at a certain angle to the platform, tilting downwards.

[0007] The outrigger drive mechanism includes a first slider, a first connecting rod, a first crank, a first large gear shaft, a first large gear, a first small gear shaft, and a first small gear. The first slider is connected to the platform at both ends via a first cylindrical helical compression spring and a first cylindrical helical tension spring, respectively. One end of the first connecting rod is connected to the first slider via a revolute joint, and the other end is connected to the first crank via a revolute joint. One end of the first crank is connected to the first connecting rod via a revolute joint, and the other end is fixedly connected to the first large gear shaft. One end of the first large gear shaft is connected to the platform via a revolute joint, and the other end is fixedly connected to the first large gear. The first small gear meshes with the first large gear, and one end of the first small gear shaft is fixedly connected to the first small gear, while the other end is connected to the platform via a revolute joint.

[0008] The arm deployment and locking mechanism includes an interface, a first pinion shaft, an unlocking pin, a fixing pin, a side cover plate, a rear cover plate, and a rotating pair outer ear. The hinge end of the interface is fixedly connected to the first pinion shaft, and the planar end of the interface is fixedly connected to the lower platform of the one-dimensional deployment mechanism. A first cylindrical helical compression spring is provided between the unlocking pin and the rear cover plate. The rear cover plate is connected to the rotating pair outer ear by screws. The fixing pin and the unlocking pin are connected by a slanted groove. A first cylindrical helical compression spring is provided between the fixing pin and the inner cavity of the rotating pair outer ear. The side cover plate is connected to the rotating pair outer ear by screws.

[0009] The energy-absorbing module deployment and locking mechanism includes a boss, a latch, a cover plate, a recess, and a hinge. A first cylindrical helical compression spring is provided between the latch and the boss. The cover plate is connected to the boss by screws, and the boss and the recess are connected by a hinge.

[0010] The boss has a limiting groove for limiting the locking tongue; the concave platform has square holes on three sides for cooperating with the locking tongue to achieve joint locking.

[0011] The energy-absorbing module drive mechanism includes a second slider, a second connecting rod, a second crank, a second large gear shaft, a second large gear, a second small gear, and a second small gear shaft. The two ends of the second slider are connected to the boss of the energy-absorbing module unfolding and locking mechanism via a first cylindrical helical compression spring and a first cylindrical helical tension spring, respectively. One end of the second connecting rod is connected to the second slider via a revolute joint, and the other end is connected to the second crank via a revolute joint. One end of the second crank is connected to the second connecting rod via a revolute joint, and the other end is fixed to the second large gear shaft. One end of the second large gear shaft is connected to the boss of the energy-absorbing module unfolding and locking mechanism via a revolute joint, and the other end is fixedly connected to the second large gear. The second small gear meshes with the second large gear. One end of the second small gear shaft is fixedly connected to the second small gear, and the other end is fixedly connected to the hinge in the energy-absorbing module unfolding and locking mechanism.

[0012] The energy-absorbing module includes a one-dimensional deployment mechanism and an energy-absorbing material. The energy-absorbing material and the one-dimensional deployment mechanism are combined together. The energy-absorbing material is located inside the one-dimensional deployment mechanism and deforms synchronously during a collision. The movements of the energy-absorbing material and the one-dimensional deployment mechanism do not interfere with each other.

[0013] The one-dimensional unfolding mechanism includes a lower platform, a middle platform, an upper platform, and a support chain. The three platforms are parallel to each other. The support chain includes a lower support chain rod and an upper support chain rod. Rotating joints are installed at both ends of the support chain rods. The support chain rods are connected to each other and to the platforms through rotating joints.

[0014] The upper branch rod has a groove, and the lower branch rod engages with the groove of the upper branch rod when the mechanism platform retracts, preventing interference between the two rods during the retraction of the mechanism. The branch rod is initially tilted to prevent the mechanism from exhibiting unusual states during the retraction movement.

[0015] The lower platform, middle platform, upper platform, and branch chain materials are all made of carbon fiber and metal inlays.

[0016] The two ends of the energy-absorbing material are fixedly connected to the platform of the one-dimensional unfolding mechanism. When the platform of the mechanism is compressed by pressure, it squeezes the energy-absorbing material, and the energy-absorbing material absorbs the impact energy.

[0017] The energy-absorbing material is aluminum honeycomb or aluminum foam.

[0018] The beneficial effects of the invention compared to existing technologies are as follows:

[0019] 1. The overall structure of this invention is lightweight. Most of the structural materials of this invention are carbon fiber materials, which have the characteristics of low density and high strength.

[0020] 2. The present invention has good buffering performance and can absorb the impact of heavy equipment being airdropped. The energy-absorbing material aluminum honeycomb used in the present invention has the advantages of low density and high specific energy absorption, and its energy absorption effect is more significant compared with most existing energy-absorbing materials.

[0021] 3. This invention can meet the parachute-free airdrop requirements of heavy equipment. Currently, most parachute-free airdrop devices can only meet the parachute-free airdrop requirements of materials such as liquids and food that are resistant to impact and do not have high requirements for structural integrity. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the retracted state of the ultra-low altitude parachute-free airdrop device of the present invention.

[0023] Figure 2 This is a schematic diagram of the working state of the ultra-low altitude parachute-free airdrop device of the present invention;

[0024] Figure 3 This is a schematic diagram of the energy absorption module in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the one-dimensional unfolding mechanism in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the branch structure in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the support arm drive mechanism in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the support arm deployment and locking mechanism in an embodiment of the present invention;

[0029] Figure 8 This is a half-sectional schematic diagram of the outer ear of the rotating part in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the working state of the outrigger deployment and locking mechanism in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the joint drive mechanism of the energy absorption module in an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the joint deployment and locking mechanism of the energy absorption module in an embodiment of the present invention;

[0033] Figure 12 This is a schematic diagram of the internal structure of the joint deployment and locking mechanism of the energy absorption module in an embodiment of the present invention;

[0034] Figure 13 This is a schematic diagram of the recessed platform in an embodiment of the present invention.

[0035] In the diagram: 1. Platform; 2. First slider; 3. First connecting rod; 4. First crank; 5. First large gear shaft; 6. First large gear; 7. First small gear shaft; 8. First small gear; 9. One-dimensional unfolding mechanism; 10. Energy-absorbing material; 11. Interface; 12. Unlocking pin; 13. Fixing pin; 14. Side cover plate; 15. Rear cover plate; 16. Rotating pair outer ear; 17. Boss; 18. Cover plate; 19. Recess; 20. Second slider Block; 21. Second connecting rod; 22. Second crank; 23. Second large gear shaft; 24. Second large gear; 25. Second small gear; 26. Second small gear shaft; 901. Lower platform; 902. Middle platform; 903. Upper platform; 904. Lower branch rod; 905. Upper branch rod; A. Support arm; B. Energy absorption module; C. Branch; D. Locking tongue; E. Hinge; F. Limiting groove; G. Square hole; H. Foot pad; T. Electromagnetic lock. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1 As shown, an ultra-low altitude parachute-less airdrop device includes a platform 1, four outriggers A, and a foot pad H. The platform 1 is connected to the four outriggers A via hinges. Each hinge connection between the platform 1 and each outrigger A is equipped with an outrigger drive mechanism and an outrigger deployment locking mechanism. Each outrigger A consists of three energy-absorbing modules B. The connection between the energy-absorbing modules B is equipped with an energy-absorbing module drive mechanism and an energy-absorbing module deployment locking mechanism. The outriggers A and the foot pad H are connected via ball joints. Before use, the outriggers A are folded up and erected, and the energy-absorbing modules B are folded together to form a rectangular body with a relatively short length. The rectangular body is placed in the same direction as the length of the platform 1. The outriggers A and the energy-absorbing modules B are locked together by an electromagnetic lock T. Depending on the placement position, the rectangular body formed by the folded energy-absorbing modules B forms a certain angle with the hinge rod. This angle can be changed according to the storage needs of the airdrop device.

[0038] like Figure 2 As shown, when the ultra-low altitude parachuteless airdrop device is working, the magnetic lock T between the support arm A and the platform 1, and between the energy absorption modules B and B, is de-energized. The support arm A and the energy absorption modules B move under the drive of their respective drive mechanisms. When the support arm A and the energy absorption modules B move to the working position, the locking device is triggered to lock. After locking, the impact energy is absorbed by the energy absorption material 10 inside the support arm A, so that the airdrop device can land safely.

[0039] Based on the above structure, such as Figure 3 As shown, in this embodiment, the collision buffer energy absorption device in the patent (CN113715764A - a collision buffer energy absorption device with the combined effect of a one-dimensional deployment mechanism and energy-absorbing material) is used as the main component of the energy absorption module B. The support arm drive mechanism and the support arm deployment locking mechanism are used to organically combine the energy absorption module B with the support arm A and the platform 1, thereby effectively absorbing the impact of heavy equipment airdrop to meet the parachute-free airdrop requirements of large precision equipment with high structural integrity requirements.

[0040] Specifically, the energy-absorbing module B includes a one-dimensional unfolding mechanism 9 and an energy-absorbing material 10. The energy-absorbing material 10 and the one-dimensional unfolding mechanism 9 are combined together. The energy-absorbing material 10 is located inside the one-dimensional unfolding mechanism and deforms synchronously during collision. The movements of the energy-absorbing material 10 and the one-dimensional unfolding mechanism 9 do not interfere with each other.

[0041] Specifically, the two ends of the energy-absorbing material 10 are fixedly connected to the platform of the one-dimensional unfolding mechanism 9. When the platform of the mechanism is compressed under pressure, it squeezes the energy-absorbing material, and the energy-absorbing material absorbs the impact energy.

[0042] Preferably, the energy-absorbing material 10 is aluminum honeycomb or aluminum foam.

[0043] like Figure 4 , Figure 5 As shown, the one-dimensional unfolding mechanism 9 includes a lower platform 901, a middle platform 902, an upper platform 903, and a branch C. The three platforms are parallel to each other. The branch C includes a lower branch rod 904 and an upper branch rod 905. Rotating joints are installed at both ends of the branch rods. The branch rods are connected to each other and to the platforms through rotating joints.

[0044] Specifically, the upper branch rod 905 has a groove, and the lower branch rod 904 cooperates with the groove of the upper branch rod 905 when the mechanism platform retracts to prevent interference between the two rods during the retraction of the mechanism. The branch C is initially in an inclined state to prevent the mechanism from entering an unusual state during the retraction movement.

[0045] Preferably, the lower platform 901, the middle platform 902, the upper platform 903, and the branch C material are all made of carbon fiber material and metal inlays.

[0046] like Figure 6As shown, the arm drive mechanism includes a first slider 2, a first connecting rod 3, a first crank 4, a large gear shaft 5, a first large gear 6, a first small gear shaft 7, and a first small gear 8. The first slider 2 is connected to the platform 1 at both ends via a first cylindrical helical compression spring and a first cylindrical helical tension spring, respectively. One end of the first connecting rod 3 is connected to the first slider 2 via a revolute joint, and the other end is connected to the first crank 4 via a revolute joint. One end of the first crank 4 is connected to the first connecting rod 3 via a revolute joint, and the other end is fixedly connected to the large gear shaft 5. One end of the large gear shaft 5 is connected to the platform 1 via a revolute joint, and the other end is fixedly connected to the first large gear 6. The first small gear 8 meshes with the first large gear 6. One end of the first small gear shaft 7 is fixedly connected to the first small gear 8, and the other end is connected to the platform 1 via a revolute joint.

[0047] like Figure 7 , Figure 8 , Figure 9 As shown, the arm deployment and locking mechanism includes an interface 11, a first pinion shaft 7, an unlocking pin 12, a fixing pin 13, a side cover plate 14, a rear cover plate 15, and a rotating pair outer ear 16. The hinge end of the interface 11 is fixedly connected to the first pinion shaft 7, and the planar end of the interface 11 is fixedly connected to the lower platform of the one-dimensional deployment mechanism 9. A first cylindrical helical compression spring is provided between the unlocking pin 12 and the rear cover plate 15. The rear cover plate 15 is connected to the rotating pair outer ear 16 by screws. The fixing pin 13 is connected to the unlocking pin 12 through a slanted groove. A first cylindrical helical compression spring is provided between the fixing pin 13 and the inner cavity of the rotating pair outer ear 16. The side cover plate 14 is connected to the rotating pair outer ear 16 by screws.

[0048] like Figure 10 As shown, the energy-absorbing module drive mechanism includes a second slider 20, a second connecting rod 21, a second crank 22, a second large gear shaft 23, a second large gear 24, a second small gear 25, and a second small gear shaft 26. The two ends of the second slider 20 are connected to the boss 17 of the energy-absorbing module unfolding and locking mechanism via a first cylindrical helical compression spring and a first cylindrical helical tension spring, respectively. One end of the second connecting rod 21 is connected to the second slider 20 via a revolute joint, and the other end is connected to the second crank 22 via a revolute joint. One end of the second crank 22 is connected to the second connecting rod 21 via a revolute joint, and the other end is fixed to the second large gear shaft 23. One end of the second large gear shaft 23 is connected to the boss 17 of the energy-absorbing module unfolding and locking mechanism via a revolute joint, and the other end is fixedly connected to the second large gear 24. The second small gear 25 meshes with the second large gear 24. One end of the second small gear shaft 26 is fixedly connected to the second small gear 25, and the other end is fixedly connected to the hinge E in the energy-absorbing module unfolding and locking mechanism.

[0049] like Figure 11 , Figure 12 , Figure 13As shown, the energy-absorbing module deployment and locking mechanism includes a boss 17, a locking tongue D, a cover plate 18, a recess 19, and a hinge E. A first cylindrical helical compression spring is provided between the locking tongue D and the boss 17. The cover plate 18 is connected to the boss 17 by screws, and the boss 17 is connected to the recess 19 by the hinge E.

[0050] Specifically, the boss 17 has a limiting groove F for limiting the locking tongue D; the recess 19 has square holes G on three sides for cooperating with the locking tongue D to achieve joint locking.

[0051] Work process:

[0052] Before use, the ultra-low altitude parachute-free airdrop device of this invention is in a folded state, with each energy-absorbing module B folded together to form a rectangular body with a relatively short length. The rectangular body is placed in the same direction as the length of the platform 1. The support arm A and the energy-absorbing module B are locked together by an electromagnetic lock T. Depending on the actual placement position, the rectangular body formed by the folded energy-absorbing module B forms a certain angle with the hinge rod. This angle can be changed according to the storage needs of the airdrop device.

[0053] When the ultra-low altitude parachuteless airdrop device enters the working state, the magnetic lock T between the outrigger A and the platform 1, and between the energy absorption modules B, is de-energized. The outrigger A and the energy absorption module B move under the drive of their respective drive mechanisms. When the outrigger A and the energy absorption module B move to the working position, the locking device is triggered to lock. After locking, the impact energy is absorbed by the energy absorption material 10 inside the outrigger A, so that the airdrop device can land safely.

[0054] The ultra-low altitude parachute-free airdrop device of this invention has a lightweight overall structure. The carbon fiber material used has low density and high strength, making it easy to transport. The aluminum honeycomb energy-absorbing material used has low density and high specific energy absorption. Compared with most existing energy-absorbing materials, it has better buffering performance and can effectively absorb the impact of airdropping heavy equipment, meeting the parachute-free airdrop requirements of large and precision equipment with high requirements for structural integrity.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-altitude parachute-free airdrop device, comprising a platform (1), a support arm (A), and a footpad (H), characterized in that, The platform (1) and the four support arms (A) are all connected by hinges. The hinge connection between the platform (1) and each support arm (A) is provided with a support arm drive mechanism and a support arm deployment locking mechanism. Each support arm (A) is composed of three energy-absorbing modules (B). The connection of the energy-absorbing modules (B) is provided with an energy-absorbing module drive mechanism and an energy-absorbing module deployment locking mechanism. The support arm (A) and the foot pad (H) are connected by a ball joint. Before use, the support arm (A) is folded up and erected. Each energy-absorbing module (B) is folded together to form a rectangular body with a smaller length. The rectangular body is placed in the same direction as the length of the platform (1). The support arm (A) and the energy-absorbing module (B) are locked together by an electromagnetic lock (T). The rectangular body formed by the folded energy-absorbing module (B) is at a certain angle to the interface (11). When airdropped, the electromagnetic lock (T) is unlocked, the energy-absorbing module (B) is deployed and locked into a straight line, and the support arm (A) is at a certain angle to the platform (1) and tilted downward. The arm drive mechanism includes a first slider (2), a first connecting rod (3), a first crank (4), a large gear shaft (5), a first large gear (6), a first small gear shaft (7), and a first small gear (8). The two ends of the first slider (2) are connected to the platform (1) through a first cylindrical helical compression spring and a first cylindrical helical tension spring, respectively. One end of the first connecting rod (3) is connected to the first slider (2) through a revolute joint, and the other end is connected to the first crank (4) through a revolute joint. One end of the first crank (4) is connected to the first connecting rod (3) through a revolute joint, and the other end is fixedly connected to the large gear shaft (5). One end of the large gear shaft (5) is connected to the platform (1) through a revolute joint, and the other end is fixedly connected to the first large gear (6). The first small gear (8) meshes with the first large gear (6). One end of the first small gear shaft (7) is fixedly connected to the first small gear (8), and the other end is connected to the platform (1) through a revolute joint. The arm deployment locking mechanism includes an interface (11), a first pinion shaft (7), an unlocking pin (12), a fixing pin (13), a side cover plate (14), a rear cover plate (15), and a rotating pair outer ear (16). The hinge end of the interface (11) is fixedly connected to the first pinion shaft (7), and the planar end of the interface (11) is fixedly connected to the lower platform of the one-dimensional deployment mechanism (9). A first cylindrical helical compression spring is provided between the unlocking pin (12) and the rear cover plate (15). The rear cover plate (15) and the rotating pair outer ear (16) are connected by screws. The fixing pin (13) and the unlocking pin (12) are connected by a slanted groove. A first cylindrical helical compression spring is provided between the fixing pin (13) and the inner cavity of the rotating pair outer ear (16). The side cover plate (14) and the rotating pair outer ear (16) are connected by screws.

2. The ultra-low altitude parachute-free airdrop device according to claim 1, characterized in that: The energy-absorbing module deployment and locking mechanism includes a boss (17), a latch (D), a cover plate (18), a recess (19), and a hinge (E). A first cylindrical helical compression spring is provided between the latch (D) and the boss (17). The cover plate (18) is connected to the boss (17) by screws, and the boss (17) is connected to the recess (19) by the hinge (E).

3. The ultra-low altitude parachute-free airdrop device according to claim 2, characterized in that: The boss (17) has a limiting groove (F) for limiting the locking tongue (D); the recess (19) has square holes (G) on three sides for cooperating with the locking tongue (D) to achieve joint locking.

4. The ultra-low altitude parachute-free airdrop device according to claim 1, characterized in that: The energy-absorbing module drive mechanism includes a second slider (20), a second connecting rod (21), a second crank (22), a second large gear shaft (23), a second large gear (24), a second small gear (25), and a second small gear shaft (26). The two ends of the second slider (20) are connected to the boss (17) of the energy-absorbing module unfolding and locking mechanism through a first cylindrical helical compression spring and a first cylindrical helical tension spring, respectively. One end of the second connecting rod (21) is connected to the second slider (20) through a rotating joint, and the other end is connected to the second crank (26) through a rotating joint. 2) Connected; one end of the second crank (22) is connected to the second connecting rod (21) through a rotating joint, and the other end is fixed to the second large gear shaft (23); one end of the second large gear shaft (23) is connected to the boss (17) of the energy absorption module unfolding and locking mechanism through a rotating joint, and the other end is fixedly connected to the second large gear (24); the second small gear (25) meshes with the second large gear (24); one end of the second small gear shaft (26) is fixedly connected to the second small gear (25), and the other end is fixedly connected to the hinge (E) in the energy absorption module unfolding and locking mechanism.

5. The ultra-low altitude parachute-free airdrop device according to claim 1, characterized in that: The energy-absorbing module (B) includes a one-dimensional unfolding mechanism (9) and an energy-absorbing material (10). The energy-absorbing material (10) and the one-dimensional unfolding mechanism (9) are combined together. The energy-absorbing material (10) is located inside the one-dimensional unfolding mechanism and deforms synchronously during collision. The movements of the energy-absorbing material (10) and the one-dimensional unfolding mechanism (9) do not interfere with each other.

6. The ultra-low altitude parachute-free airdrop device according to claim 5, characterized in that: The one-dimensional unfolding mechanism (9) includes a lower platform (901), a middle platform (902), an upper platform (903), and a branch (C). The three platforms are parallel to each other. The branch (C) includes a lower branch rod (904) and an upper branch rod (905). Rotating joints are installed at both ends of the branch rods. The branch rods are connected to each other and to the platforms through rotating joints.

7. The ultra-low altitude parachute-free airdrop device according to claim 6, characterized in that: The upper branch rod (905) has a groove, and the lower branch rod (904) cooperates with the groove of the upper branch rod (905) when the mechanism platform is retracted to prevent interference between the two rods when the mechanism is retracted. The branch (C) is initially in an inclined state to prevent the mechanism from having a strange state when it is retracted.

8. The ultra-low altitude parachute-free airdrop device according to claim 7, characterized in that: The lower platform (901), middle platform (902), upper platform (903), and branch (C) are all made of carbon fiber material and metal inlays.

9. A low-altitude parachute-free airdrop device according to claim 8, characterized in that: The two ends of the energy-absorbing material (10) are fixedly connected to the platform of the one-dimensional unfolding mechanism (9). When the platform of the mechanism is compressed by pressure, it squeezes the energy-absorbing material and absorbs the impact energy.

10. A low-altitude parachute-free airdrop device according to claim 5, characterized in that: The energy-absorbing material (10) is aluminum honeycomb or aluminum foam.

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