An anti-impact and shock-absorbing device for high-altitude fall and a test platform

Abstract

The present invention belongs to the technical field of anti-impact buffering and shock absorption for high-altitude drop landing, and particularly relates to an anti-impact shock absorption device and a test platform for high-altitude drop. The shock absorption device includes a housing, an upper cover, a wire rope shock absorber, an internal buffer pad, an internal counterweight load, and a bottom buffer device. Among them, the wire rope shock absorber is arranged on the bottom buffer device, the housing is arranged on the wire rope shock absorber, an internal buffer pad is arranged inside the housing, the internal counterweight load is embedded in the internal buffer pad, high-precision electronic components with internal acceleration sensors are arranged on the internal counterweight load, and the top of the housing is sealed by the upper cover; an external acceleration sensor is arranged on the bottom buffer device, and the shock isolation efficiency is determined by the measured values of the acceleration response tests of the internal acceleration sensor and the external acceleration sensor. The present invention has a high load-mass ratio, has multi-directional, multi-stage, and high-efficiency shock isolation and vibration isolation capabilities, and is widely used in the impact protection of reusable air drops and transportation, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of anti - impact buffering and shock absorption for high - altitude fall landing, and particularly relates to an anti - impact shock - absorption device and a test platform for high - altitude fall. Background Art

[0002] With the continuous development of modern warfare towards diverse scenarios, as well as the increasing number of frequent natural disasters and man - made accidents, the urgent need for high - altitude fall protection is growing day by day. When high - precision electronic components, precision instruments, etc. are transported or accidentally dropped to the ground, they will be subjected to impact vibration. If the protection is improper, they are likely to be damaged. The anti - impact landing buffering and shock - absorption device can greatly reduce the impact load borne by the payload during landing, and can solve many negative impacts brought by the fall impact and vibration. Under certain limiting conditions such as a certain fall height, shock - isolation efficiency, and mass constraint, how to achieve a lightweight and highly efficient anti - impact landing buffer device has always been a research hotspot and difficulty in the field. Summary of the Invention

[0003] Aiming at the above problems, the purpose of the present invention is to provide an anti - impact shock - absorption device and a test platform for high - altitude fall, which can effectively protect the payload for the high - altitude fall impact conditions of high - precision electronic devices and precision instruments, etc.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] An embodiment of the present invention provides an anti - impact shock - absorption device for high - altitude fall, including a housing, an upper cover, a wire rope shock absorber, an internal buffer pad, an internal counterweight load, and a bottom buffer device. The wire rope shock absorber is arranged on the bottom buffer device, the housing is arranged on the wire rope shock absorber, an internal buffer pad is arranged inside the housing, the internal counterweight load is embedded in the internal buffer pad, high - precision electronic components are arranged on the internal counterweight load, an internal acceleration sensor is arranged on the high - precision electronic components, and the top of the housing is sealed by an internal buffer upper cover and the upper cover; an external acceleration sensor is arranged on the bottom buffer device, and the shock - isolation efficiency of the anti - impact shock - absorption device is measured by the measured values of the acceleration response tests of the internal acceleration sensor and the external acceleration sensor.

[0006] The housing includes side panel I, bottom panel, side panel II, side panel strengthening structure I, and side panel strengthening structure II. Two relatively arranged side panel Is and two relatively arranged side panel IIs are arranged on the bottom panel. Side panel strengthening structure I connected to the bottom panel is arranged on the outer sides of the two side panel Is, and side panel strengthening structure II connected to the bottom panel is arranged on the outer sides of the two side panel IIs.

[0007] The side panel reinforcement structure I includes an angle joint reinforcement lug I and two support rods I arranged on both sides of the angle joint reinforcement lug I. The angle joint reinforcement lug I is a right-angle structure, and the two right-angle surfaces are respectively connected to the side panel I and the bottom panel. The support rod I is inclined and arranged outside the side panel I, and the upper and lower ends of the support rod I are respectively connected to the side panel I and the bottom panel.

[0008] The side panel reinforcement structure II includes a support rod II and two angle joint reinforcement lugs II arranged on both sides of the support rod II. The two angle joint reinforcement lugs II are right-angle structures, and the two right-angle surfaces are respectively connected to the side panel II and the bottom panel. The support rod II is inclined and arranged outside the side panel II, and the upper and lower ends of the support rod II are respectively connected to the side panel II and the bottom panel.

[0009] The bottom buffer device includes an upper bottom plate, a lower bottom plate, and a bottom intermediate buffer pad arranged between the upper bottom plate and the lower bottom plate. The external acceleration sensor is arranged on the lower bottom plate.

[0010] The material of the upper bottom plate is aluminum alloy, and the material of the lower bottom plate is polyurethane. The bottom intermediate buffer pad and the internal buffer pad are both made of EVA material.

[0011] There are multiple wire rope shock absorbers, which are arranged in sequence along the circumferential direction.

[0012] Another embodiment of the present invention provides a high-altitude drop anti-impact and shock-absorbing test platform, which includes a wire rope chain, a fixing frame, a manual hoist, and the high-altitude drop anti-impact and shock-absorbing device as described above. The manual hoist is arranged on the top of the fixing frame, the wire rope chain is installed on the manual hoist, one end of the wire rope chain is manually operated, and the hook at the other end of the wire rope chain is connected to the upper cover of the high-altitude drop anti-impact and shock-absorbing device through a nylon sling.

[0013] The fixing frame is a folding telescopic ladder in the shape of a herringbone, and the manual hoist is arranged on the top cross beam of the folding telescopic ladder in the shape of a herringbone.

[0014] Before the test, manually pull the wire rope chain to lift the high-altitude drop anti-impact and shock-absorbing device to the set height above the ground required for the test.

[0015] During the test, cut the nylon sling to make the high-altitude drop anti-impact and shock-absorbing device freely fall and have an instantaneous impact with the ground, and measure the shock isolation efficiency of the anti-impact and shock-absorbing device through the acceleration response test measurement values of the internal acceleration sensor and the external acceleration sensor.

[0016] The advantages and positive effects of the present invention are as follows:

[0017] 1. The structure of the present invention is compact, occupies a small volume, has a high utilization rate of the structural space, and is convenient for disassembly and assembly.

[0018] 2. The present invention has a high load mass ratio, and the anti-impact structure has multi-directional, multi-stage, and efficient shock and vibration isolation capabilities, and can be widely applied to fields such as shock protection for reusable airdrops and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an axonometric view of a high-altitude drop anti-impact shock and vibration isolation device in an embodiment of the present invention;

[0020] Figure 2 is a schematic internal structure view of a high-altitude drop anti-impact shock and vibration isolation device in an embodiment of the present invention;

[0021] Figure 3 is a schematic structure view of a high-altitude drop anti-impact shock and vibration test platform in another embodiment of the present invention;

[0022] In the figure: 1 is a wire rope chain, 2 is a folding telescopic ladder in the shape of a herringbone, 3 is a high-altitude drop anti-impact shock and vibration isolation device, 4 is a nylon lifting rope, 5 is a manual chain hoist, 301 is an upper cover, 302 is side panel I, 303 is support rod I, 304 is angle joint reinforcing ear I, 305 is a lower panel, 306 is an upper bottom plate, 307 is a bottom intermediate buffer pad, 308 is a lower bottom plate, 309 is a wire rope shock absorber, 310 is support rod II, 311 is side panel II, 312 is an internal buffer upper cover, 313 is an internal buffer pad, 314 is an external acceleration sensor, 315 is an internal counterweight load, 316 is an internal acceleration sensor, 317 is an internal high-precision circuit board, 318 is angle joint reinforcing ear II. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] As Figure 1 、 Figure 2As shown in the figure, an embodiment of the present invention provides an anti-impact and shock-absorbing device for high-altitude falls, which includes a housing, an upper cover 301, a wire rope shock absorber 309, an internal buffer pad 313, an internal counterweight load 315, and a bottom buffer device. Among them, the wire rope shock absorber 309 is arranged on the bottom buffer device, the housing is arranged on the wire rope shock absorber 309, the internal buffer pad 313 is arranged inside the housing, the internal counterweight load 315 is embedded in the internal buffer pad 313, high-precision electronic components are arranged on the internal counterweight load 315, an internal acceleration sensor 316 is arranged on the high-precision electronic components, and the top of the housing is sealed by an internal buffer upper cover 312 and the upper cover 301; an external acceleration sensor 314 is arranged on the bottom buffer device. The two internal and external acceleration sensors are used to measure the acceleration response values of the measuring points in the anti-impact structure, that is, the shock isolation efficiency of the anti-impact and shock-absorbing device is determined by the acceleration response test measurement values of the internal acceleration sensor 316 and the external acceleration sensor 314. The bottom buffer device and the wire rope shock absorber 309 mainly provide structural support and anti-impact buffer shock absorption.

[0025] As Figure 1 As shown in the figure, in the embodiment of the present invention, the housing includes a side panel I 302, a bottom panel 305, a side panel II 311, a side panel strengthening structure I, and a side panel strengthening structure II. Among them, two relatively arranged side panels I 302 and two relatively arranged side panels II 311 are arranged on the bottom panel 305, and the lower ends of the two side panels I 302 and the two side panels II 311 are connected to the bottom panel 305 by screws and enclose a square side wall of the housing. Further, side panel strengthening structures I are arranged on the outer sides of the two side panels I 302 and are connected to the bottom panel 305, and side panel strengthening structures II are arranged on the outer sides of the two side panels II 311 and are connected to the bottom panel 305. The strengthening support is realized through the side panel strengthening structure I and the side panel strengthening structure II to improve the connection stiffness.

[0026] Specifically, the side panel strengthening structure I includes an angle joint strengthening lug I 304 and two support rods I 303 arranged on both sides of the angle joint strengthening lug I 304. Among them, the angle joint strengthening lug I 304 is a right-angle structure, and the two right-angle surfaces are respectively connected to the side panel I 302 and the bottom panel 305; the support rod I 303 is obliquely arranged on the outer side of the side panel I 302, and the upper and lower ends of the support rod I 303 are respectively fixedly connected to the side panel I 302 and the bottom panel 305. The side panel strengthening structure II includes a support rod II 310 and two angle joint strengthening lugs II 318 arranged on both sides of the support rod II 310. Among them, the two angle joint strengthening lugs II 318 are right-angle structures, and the two right-angle surfaces are respectively connected to the side panel II 311 and the bottom panel 305; the support rod II 310 is obliquely arranged on the outer side of the side panel II 311, and the upper and lower ends of the support rod II 310 are respectively fixedly connected to the side panel II 311 and the bottom panel 305.

[0027] As Figure 2 shown, in an embodiment of the present invention, the bottom buffer device includes an upper bottom plate 306, a lower bottom plate 308, and a bottom intermediate buffer pad 307 disposed between the upper bottom plate 306 and the lower bottom plate 308; an external acceleration sensor 314 is adhered to the lower bottom plate 308.

[0028] Specifically, the upper bottom plate 306 is made of aluminum alloy, and the lower bottom plate 308 is made of polyurethane; both the bottom intermediate buffer pad 307 and the internal buffer pad 313 are made of EVA material.

[0029] Further, there are a plurality of wire rope shock absorbers 309, which are arranged in sequence along the circumferential direction on the upper bottom plate 306. In this embodiment, the high-precision electronic component is an internal high-precision circuit board 317, and the internal high-precision circuit board 317 is installed on the internal counterweight load 315 by bolts.

[0030] An anti-impact and shock-absorbing device for high-altitude drop provided in this embodiment, an internal acceleration sensor 316 is adhered to the internal high-precision circuit board 317 to measure the acceleration response value of the protected load measuring point in the anti-impact structure during the impact test; the external acceleration sensor 314 is adhered to the lower bottom plate 308 to measure the impact acceleration response value at the direct contact point between the anti-impact and shock-absorbing device and the ground during the impact test; the shock isolation efficiency of the anti-impact and shock-absorbing device can be determined through the above two acceleration response test measurement values, that is, the anti-impact and shock-absorbing performance of the entire system can be evaluated quantitatively and qualitatively. Through the combined action of the above three-level anti-impact and shock-absorbing protection system, at a specific height or a certain vertical landing speed (≥7m / s), effective protection of the high-precision circuit board or precision instrument and equipment inside the device can be achieved, ensuring no damage after the landing impact.

[0031] As Figure 3 shown, another embodiment of the present invention provides a high-altitude drop anti-impact and shock-absorbing test platform, including a wire rope chain 1, a fixing frame, a manual chain hoist 5, and the high-altitude drop anti-impact and shock-absorbing device 3 in any of the above embodiments. The manual chain hoist 5 is disposed on the top of the fixing frame, the wire rope chain 1 is installed on the manual chain hoist 5, one end of the wire rope chain 1 is manually operated, and the hook at the other end of the wire rope chain 1 is connected to the upper cover of the high-altitude drop anti-impact and shock-absorbing device 3 through a nylon sling 4.

[0032] In this embodiment, the fixing frame is a folding telescopic ladder 2 for two persons, and the manual chain hoist 5 is disposed on the top cross beam of the folding telescopic ladder 2 for two persons.

[0033] Before the test, manually pull the wire rope chain 1 to lift the high-altitude drop anti-impact and shock-absorbing device 3 to the set height from the ground required for the test;

[0034] During the test, cut the nylon suspension rope 4 with a high branch shear, causing the high-altitude drop anti-impact and shock-absorbing device 3 to freely fall and instantaneously impact the ground. Measure the shock isolation efficiency of the anti-impact and shock-absorbing device through the acceleration response test measurement values of the internal acceleration sensor 316 and the external acceleration sensor 314. To ensure the accuracy of the measurement results, the external acceleration sensor 314 should be closely attached to the lower bottom plate 308.

[0035] Specifically, first press the telescopic button of the folding ladder 2 in the shape of a person, unlock the limit joint and extend the pull rod, unfold from the folded state into a folding ladder in the shape of a person, and form a stable triangular support with the ground; the upper hook of the manual chain hoist 5 is installed in the middle position of the top cross bar of the folding ladder 2 in the shape of a person, the wire rope chain 1 is installed on the manual chain hoist 5, one end of the wire rope chain 1 is for manual operation, and the small hook at the other end of the wire rope chain 1 is connected to the upper cover of the high-altitude drop anti-impact and shock-absorbing device 3 through the nylon suspension rope 4.

[0036] Specifically, the internal acceleration sensor 316 is pasted on the internal high-precision circuit board 317 to measure the acceleration response value of the protected load measurement point in the anti-impact structure during the impact test; the external acceleration sensor 314 is pasted on the lower bottom plate 308 to measure the impact acceleration response value at the direct contact point between the anti-impact and shock-absorbing device and the ground during the impact test; the shock isolation efficiency of the anti-impact and shock-absorbing device can be measured through the above two acceleration response test measurement values, that is, the anti-impact and shock-absorbing performance of the entire system can be evaluated quantitatively and qualitatively. Through the comprehensive action of the above three-level anti-impact and shock-absorbing protection system, at a specific height or a certain vertical landing speed (≥7m / s), effective protection of the high-precision circuit board or precision instrument equipment inside the device can be achieved, ensuring no damage after the landing impact.

[0037] Conduct drop tests at different heights on the developed anti-impact and shock-absorbing device through the test platforms built indoors and outdoors to verify the anti-impact and shock-absorbing device. Mass constraint: the mass of the protected load > 20 kg, and the mass of the landing recovery buffer device < 20 kg.

[0038] Test 1:

[0039] After dropping from a height of 0.5 meters, at the moment of landing impact, the maximum impact value of the external acceleration sensor 314 is 1386g, the maximum impact value of the internal acceleration sensor 316 is 30.8g, and the calculated shock isolation efficiency is 97.78%.

[0040] Test 2:

[0041] After dropping from a height of 1 meter, at the moment of landing impact, the maximum impact value of the external acceleration sensor 314 is 3486g, the maximum impact value of the internal acceleration sensor 316 is 72.38g, and the calculated shock isolation efficiency is 97.92%.

[0042] Test Three:

[0043] After a 1.5-meter fall, at the moment of landing impact, the maximum impact value of the external acceleration sensor 314 was 4778g, the maximum value of the internal acceleration sensor 316 was 63.14g, and the calculated anti-shock efficiency was 98.68%.

[0044] Test Four:

[0045] After a 2.7-meter fall, at the moment of landing impact, the maximum impact value of the external acceleration sensor 314 was 5207g, the maximum impact value of the internal acceleration sensor 316 was 310g, and the calculated anti-shock efficiency was 94.05%.

[0046] After each test, the anti-shock and vibration damping device was opened, the internally protected high-precision circuit board was taken out and powered on, and the circuit board worked normally and there was no damage to the appearance. Therefore, the high-altitude fall anti-shock and vibration damping device can withstand a vertical landing speed of 7 m / s (i.e., a landing height of 2.45 m from the ground), meeting the requirement that the anti-shock efficiency ≥ 90%. Through the test, it was verified that the anti-shock and vibration damping device of the present invention can provide effective protection for the internal high-precision circuit board 317 under a fall impact.

[0047] A high-altitude fall anti-shock and vibration damping device and its test platform provided by the present invention have the following working principle:

[0048] When there is a fall impact and it directly contacts the ground, the bottom middle buffer pad 307 is installed between the upper bottom plate 306 and the lower bottom plate 308 to form a first-level anti-shock and vibration damping protection system;

[0049] Five wire rope shock absorbers 309 symmetrically arranged in a circumferential distribution are installed between the lower panel 305 and the upper bottom plate 306 to form a second-level anti-shock and vibration damping protection system;

[0050] Inside the anti-shock and vibration damping lander, the internal buffer upper cover 312 is installed above the internal counterweight load 315, and the internal buffer pad 313 is installed below and around the internal counterweight load 315 to form a third-level anti-shock and vibration damping protection system;

[0051] Through the combined action of the above three-level anti-shock and vibration damping protection system, at a specific height or a certain vertical landing speed (≥ 7 m / s), it can effectively protect the high-precision circuit board or precision instrument and equipment inside the device, ensuring no damage after the landing impact.

[0052] An anti-impact and shock-absorbing test platform provided by the present invention forms a stable triangular support with the ground after the folding telescopic ladder in the shape of a herringbone is unfolded into a herringbone ladder. The anti-impact and shock-absorbing device is suspended at the lower half of the folding telescopic ladder in the shape of a herringbone through a manual chain hoist, a wire rope chain, a nylon lifting rope, etc. The protected high-precision circuit board is installed inside the anti-impact and shock-absorbing device. During the drop impact, through the effective protection of the three-stage anti-impact and shock-absorbing system of the anti-impact and shock-absorbing device, it is ensured that the high-precision circuit board is not damaged by the impact. The structure of the present invention has a high space utilization rate, is easy to disassemble and assemble, has a high load mass ratio, has multi-directional, multi-stage, and efficient shock and vibration isolation capabilities, and can be widely applied to the impact protection of reusable airdrops and transportation and other fields.

[0053] The above is only the implementation mode of the present invention and is not used to limit the protection scope of the present invention. As only the vertical drop buffer situation of the anti-impact and shock-absorbing device is mainly described in the main text of this patent, the present device can also be used for drop impact tests at multiple angles and different heights. Therefore, any modifications, equivalent replacements, improvements, expansions, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An anti-impact and shock-absorbing device for high-altitude falls, characterized in that, It includes a housing, an upper cover (301), a wire rope shock absorber (309), an internal cushion (313), an internal counterweight load (315) and a bottom buffer device. The wire rope shock absorber (309) is arranged on the bottom buffer device, the housing is arranged on the wire rope shock absorber (309), the internal cushion (313) is arranged inside the housing, the internal counterweight load (315) is embedded in the internal cushion (313), high-precision electronic components are arranged on the internal counterweight load (315), an internal acceleration sensor (316) is arranged on the high-precision electronic components, and the top of the housing is sealed by an internal buffer upper cover (312) and the upper cover (301); an external acceleration sensor (314) is arranged on the bottom buffer device, and the shock isolation efficiency of the shock and vibration isolation device is determined by the measured values of the acceleration response tests of the internal acceleration sensor (316) and the external acceleration sensor (314); The bottom buffer device includes an upper bottom plate (306), a lower bottom plate (308) and a bottom intermediate cushion (307) arranged between the upper bottom plate (306) and the lower bottom plate (308); the external acceleration sensor (314) is arranged on the lower bottom plate (308); There are multiple wire rope shock absorbers (309), which are arranged in sequence along the circumferential direction.

2. The anti-impact and shock-absorbing device for high-altitude falls according to claim 1, wherein The housing includes a side panel I (302), a lower panel (305), a side panel II (311), a side panel strengthening structure I and a side panel strengthening structure II. Two relatively arranged side panels I (302) and two relatively arranged side panels II (311) are arranged on the lower panel (305). Side panel strengthening structures I connected to the lower panel (305) are arranged on the outer sides of the two side panels I (302), and side panel strengthening structures II connected to the lower panel (305) are arranged on the outer sides of the two side panels II (311).

3. The high-altitude drop impact and vibration reduction device according to claim 2, characterized in that, The side panel strengthening structure I includes an angle joint strengthening lug I (304) and two support rods I (303) arranged on both sides of the angle joint strengthening lug I (304). The angle joint strengthening lug I (304) is a right-angle structure, and the two right-angle surfaces are respectively connected to the side panel I (302) and the lower panel (305); the support rod I (303) is inclined and arranged on the outer side of the side panel I (302), and the upper and lower ends of the support rod I (303) are respectively connected to the side panel I (302) and the lower panel (305).

4. The high-altitude drop anti-impact and shock-absorbing device according to claim 2, wherein, The side panel strengthening structure II includes a support rod II (310) and two angle joint strengthening lugs II (318) arranged on both sides of the support rod II (310). The two angle joint strengthening lugs II (318) are right-angle structures, and the two right-angle surfaces are respectively connected to the side panel II (311) and the lower panel (305); the support rod II (310) is inclined and arranged on the outer side of the side panel II (311), and the upper and lower ends of the support rod II (310) are respectively connected to the side panel II (311) and the lower panel (305).

5. The high-altitude fall anti-impact and shock-absorbing device according to claim 1, wherein The upper bottom plate (306) is made of aluminum alloy, and the lower bottom plate (308) is made of polyurethane; both the bottom middle buffer pad (307) and the internal buffer pad (313) are made of EVA material.

6. An anti-impact and shock-absorbing test platform for high-altitude falls, characterized in that, It includes a wire rope chain (1), a fixing frame, a manual chain hoist (5) and the high-altitude fall anti-impact and shock-absorbing device (3) according to any one of claims 1-5. The manual chain hoist (5) is arranged at the top of the fixing frame, the wire rope chain (1) is installed on the manual chain hoist (5), one end of the wire rope chain (1) is for manual operation, and the hook at the other end of the wire rope chain (1) is connected to the upper cover of the high-altitude fall anti-impact and shock-absorbing device (3) through a nylon sling (4).

7. The high-altitude drop anti-impact and shock-absorbing test platform according to claim 6, characterized in that, The fixing frame is a folding telescopic ladder (2) in the shape of a herringbone, and the manual chain hoist (5) is arranged on the top cross beam of the folding telescopic ladder (2) in the shape of a herringbone.

8. The high-altitude fall anti-impact and shock-absorbing test platform according to claim 6, characterized in that Before the test, manually pull the wire rope chain (1) to lift the high-altitude fall anti-impact and shock-absorbing device (3) to the set height from the ground required for the test; During the test, cut off the nylon sling (4) to make the high-altitude fall anti-impact and shock-absorbing device (3) freely fall and have an instantaneous impact with the ground, and measure the shock isolation efficiency of the anti-impact and shock-absorbing device through the acceleration response test measurement values of the internal acceleration sensor (316) and the external acceleration sensor (314).

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