Multi-mode buffering and load reducing structure for solving impact load of navigation body
By setting up a multi-mode buffering and load reduction structure on the navigation body, using metal shell, inner shell and buffer component components, the impact load problem when the navigation body enters water is solved, the impact force is reduced and the appearance and internal equipment of the navigation body are protected. Extends service life and improves environmental adaptability.
Patent Information
- Application Number
- CN202411324858.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2024-12-27
AI Technical Summary
The high impact loads that the navigation body receives during the water entry process will cause damage to the external structure and internal precision instruments, affecting its mission execution and survivability.
Using a multi-mode buffering and load reduction structure, including metal housing and inner housing, longitudinal cushioning and transverse cushioning components, the impact force transmission is reduced through the cushioning layer, cushioning and connecting fixing rods, and the use of silicone rubber and polyurethane foam Material improves buffering performance.
Effectively reduce the impact force of the navigation body when entering the water, protect the external structure and internal equipment, extend the service life, and improve environmental adaptability and electrical insulation.
Smart Images
Figure CN119190316A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of protective devices for navigation bodies, and in particular to a multi-mode buffering and load-reducing structure for solving the impact load of navigation bodies. Background Art
[0002] In modern marine engineering, aerospace and military applications, the entry of navigation bodies (such as missiles, torpedoes, submersibles and unmanned vehicles) into water is a very challenging technical problem. This process not only involves complex physical phenomena, but is also directly related to the safety performance and mission execution efficiency of the navigation body. When the navigation body enters the water medium at high speed from the air medium, it needs to cross the free interface. The drastic change in the properties of the medium at this moment (from low-density, low-viscosity gas to high-density, high-viscosity liquid) triggers a strong nonlinear dynamic response.
[0003] Specifically, when a vehicle enters the water, the interaction between the three phases of gas, liquid and solid is extremely complex. Aerodynamic effects and fluid mechanics effects alternately dominate in a very short period of time, resulting in extremely uneven pressure distribution on the surface of the vehicle and high impact loads.
[0004] This high impact load will not only cause direct impact damage to the external structure of the vehicle, such as shell deformation and crack expansion, but may also be transmitted to internal components through the structure, affecting their working accuracy, sensitivity and long-term stability. For the precision instruments and electronic equipment inside the vehicle, such impact when entering the water may cause their functions to fail or be damaged, seriously affecting the mission execution capability and survivability of the vehicle after entering the water. Summary of the invention
[0005] The present application provides a multi-mode buffering and load-reducing structure for solving the impact load of a navigation body, which can solve the technical problem in the prior art that when a navigation body enters the water, the impact causes damage to the external structure of the navigation body and the internal tight instruments.
[0006] The embodiment of the present application provides a multi-mode buffering and load reduction structure for solving the impact load of a navigation body, which includes:
[0007] A shell assembly, the shell assembly comprising a metal outer shell and a metal inner shell, the metal inner shell is used to cover the outer side of the navigation body, and the metal outer shell is arranged on the outer side of the metal inner shell;
[0008] A longitudinal buffer, the longitudinal buffer comprising a buffer layer, the buffer layer being sandwiched between the metal outer shell and the metal inner shell;
[0009] And, a transverse buffer assembly, the transverse buffer assembly includes a connecting and fixing rod and a buffer stretching piece, the two ends of the connecting and fixing rod are respectively connected to the buffer pad layer and the buffer stretching piece, and the end of the buffer stretching piece away from the connecting and fixing rod is connected to the end of the metal inner shell away from the buffer pad layer.
[0010] By adopting the above technical solution, before the navigation body enters the water, the metal inner shell cover is arranged outside the navigation body and abuts against the surface of the outer shell of the navigation body to prevent the navigation body from directly contacting the water surface when entering the water, thereby reducing the impact force on the navigation body; the metal outer shell is arranged on the outside of the metal inner shell to buffer the impact force of the metal inner shell and the navigation body inside it when entering the water. The longitudinal buffer and the transverse buffer assembly are both arranged between the metal outer shell and the metal inner shell, and the longitudinal buffer includes a buffer pad layer, which is arranged at both ends of the metal outer shell and the metal inner shell in the length direction. When the navigation body enters the water, one end of the navigation body in the length direction is first impacted by the water surface. Therefore, when the metal shell is impacted by the water surface, the metal shell is easily deformed in the direction of the navigation body. The longitudinal buffer can reduce the impact force transmitted to the metal inner shell and the navigation body inside it. At the same time, when the metal shell is deformed in the direction of the navigation body, the outer structure of the metal shell will change slightly. This slight change may cause the metal shell to deform along its own length direction, thereby squeezing the internal navigation body. The transverse buffer component can reduce the impact of the transverse deformation of the metal shell on the navigation body. The problem of the damage to the outer structure of the navigation body and the internal tight instruments caused by the impact during the navigation body entering the water in the prior art is solved.
[0011] In one embodiment, a margin adjustment member is further provided on the metal inner shell. The margin adjustment member is provided in the middle of the navigation body and is used to drive the navigation body and the metal outer shell to move relative to each other.
[0012] By adopting the above technical solution, when the deformation compression of the buffer stretching member reaches an extreme value, the margin adjusting member can facilitate the movement of the navigation body in the metal shell.
[0013] In one embodiment, a residual chute is provided on the metal shell, and the length direction of the residual chute is parallel to the length direction of the metal shell;
[0014] The margin adjustment member includes a movable slider, which is slidably arranged in the margin slide groove, and the movable slider extends from the margin slide groove and is used to be connected to the surface of the navigation body.
[0015] By adopting the above technical solution, the movable slider can drive the navigation body to slide in the residual slide groove, so as to facilitate relative sliding between the navigation body and the metal shell.
[0016] In one embodiment, a buffer protection piece is disposed on the outer sleeve of the connecting and fixing rod, and two ends of the buffer protection piece are respectively in contact with the metal outer shell and the metal inner shell.
[0017] By adopting the above technical solution, the buffer protection component transitions the hard abutment between the metal outer shell and the metal inner shell, thereby extending the service life.
[0018] In one embodiment, the buffer protection member is configured to be silicone rubber.
[0019] By adopting the above technical solutions, silicone rubber has excellent weather resistance, high and low temperature resistance and excellent chemical stability. This material can still maintain stable physical and chemical properties under extreme temperature conditions, and is not easy to age, deform or fail, so that the buffer protection parts can still have good reliability and safety during long-term use. In addition, silicone rubber also has excellent electrical insulation and biocompatibility, which further improves the protection performance of the buffer protection parts.
[0020] In one embodiment, the cushion layer is configured as polyurethane foam.
[0021] By adopting the above technical solution, polyurethane foam, as a lightweight and high-strength material, has excellent compression rebound properties. It can deform rapidly to absorb energy when impacted by external force, and then quickly return to its original shape, thereby effectively reducing the impact force on the metal inner hull and the main body of the internal vehicle. In addition, polyurethane foam also has good thermal insulation properties, which can improve the environmental adaptability of the metal inner hull and the main body of the internal vehicle.
[0022] In one embodiment, the thickness of the cushion layer is not less than 18 mm.
[0023] By adopting the above technical solution, the minimum buffering performance required by the metal inner shell and the internal navigation body can be maintained.
[0024] In one embodiment, the buffer stretching member is configured as a telescopic spring.
[0025] By adopting the above technical solution, the buffer layer can push the fixing rod to undergo lateral deformation.
[0026] In one embodiment, the length of the buffer stretching member is set between 10-30 mm.
[0027] By adopting the above technical solution, the requirement for better lateral deformation of the metal shell can be met.
[0028] In one embodiment, the metal outer shell and the metal inner shell are both made of aluminum alloy.
[0029] By adopting the above technical solution, aluminum alloy, as a lightweight and high-strength metal material, has a density far lower than pure steel. Therefore, aluminum alloy can significantly reduce the overall weight while maintaining the structural stability of the metal shell and the metal inner shell. Aluminum alloy also has good metal ductility. When the metal shell and the metal inner shell are deformed by impact, the aluminum alloy can bend naturally and has good self-repairing ability, thereby maintaining the appearance structure of the multi-mode buffer load reduction structure. At the same time, aluminum alloy also has good corrosion resistance and can resist erosion from various environmental factors, such as moisture, salt spray and some chemical substances, thereby extending the service life of the metal shell and the metal inner shell and reducing maintenance costs.
[0030] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:
[0031] By erecting a shell assembly outside the navigation body, the navigation body is protected and the impact force directly received by the navigation body when entering the water is reduced. The shell assembly is divided into a metal outer shell and a metal inner shell. The metal inner shell abuts against the surface of the navigation body, and a buffer layer is sandwiched between the metal outer shell and the metal inner shell to provide longitudinal elastic deformation margin for the metal outer shell and the metal inner shell when the navigation body is impacted; the lateral buffer assembly can enable the metal inner shell to drive the navigation body and the metal outer shell to make a small lateral movement, thereby further reducing the lateral impact force received by the navigation body, solving the problem in the prior art that the external structure of the navigation body and the internal tight instruments are damaged by the impact when the navigation body enters the water. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0033] Figure 1 This is a transverse cross-sectional view of a multi-mode buffer and load reduction structure for solving the impact load of a navigation body in the present application;
[0034] Figure 2 A longitudinal cross-sectional view of a multi-mode buffering and load-reducing structure for solving the impact load of a navigation body in the present application;
[0035] In the figure: 1. Metal outer shell; 2. Buffer cushion layer; 3. Metal inner shell; 4. Buffer stretching part; 5. Connecting fixed rod; 6. Moving slider; 7. Allowance slide groove; 8. Buffer protection part; 9. Navigation body. DETAILED DESCRIPTION
[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0037] The embodiment of the present application provides a multi-mode buffering and load reduction structure for solving the impact load of the navigation body, which can solve the problem in the prior art that the external structure and internal tight instruments of the navigation body are damaged by the impact when the navigation body enters the water.
[0038] The embodiment of the present application is described in a state where a multi-mode buffer load reduction structure for solving the impact load of the navigation body has been installed on the navigation body 9. Figure 1 The present application discloses a multi-mode buffering and load-reducing structure for solving the impact load of a navigation body, including a shell assembly, a longitudinal buffer and a transverse buffer assembly. The shell assembly includes a metal outer shell 1 and a metal inner shell 3. The metal inner shell 3 is arranged outside the navigation body 9 and abuts against the surface of the navigation body outer shell to avoid direct contact between the navigation body 9 and the water surface when entering the water, thereby reducing the impact force on the navigation body 9; the metal outer shell 1 is arranged on the outside of the metal inner shell 3 to buffer the impact force of the metal inner shell 3 and the navigation body 9 inside it when entering the water.
[0039] The longitudinal buffer and the transverse buffer assembly are both arranged between the metal outer shell 1 and the metal inner shell 3. The longitudinal buffer includes a buffer pad layer 2, which is arranged at both ends of the length direction of the metal outer shell 1 and the metal inner shell 3. When the navigation body 9 enters the water, one end of the navigation body 9 in the length direction is first impacted by the water surface. Therefore, when the metal outer shell 1 is impacted by the water surface, the metal outer shell 1 is easily deformed toward the navigation body 9, and the longitudinal buffer can reduce the impact force transmitted to the metal inner shell 3 and the navigation body 9 inside it.
[0040] When the metal shell 1 is deformed toward the navigation body 9, the outer structure of the metal shell 1 will change slightly. Such slight change may cause the metal shell 1 to deform along its own length direction, thereby squeezing the navigation body 9 inside. In order to reduce the impact of the lateral deformation of the metal shell 1 on the navigation body 9, the lateral buffer assembly includes a connecting and fixing rod 5 and a buffer stretching member 4. The buffer stretching member 4 is also sandwiched between the metal shell 1 and the metal inner shell 3. The two ends of the connecting and fixing rod 5 in the length direction are respectively connected to the buffer cushion layer 2 and the buffer stretching member 4. The end of the buffer stretching member 4 away from the connecting and fixing rod 5 is fixedly bonded to the metal inner shell 3 through an adhesive. When the metal shell 1 is deformed by the impact force, the buffer cushion layer 2 is squeezed to produce a lateral deformation along the length direction of the metal shell 1, and then the buffer stretching member 4 is pushed by the connecting and fixing rod 5 to undergo compression deformation, so as to drive the metal inner shell 3 and the navigation body 9 inside thereof to undergo a slight displacement. By driving the navigation body 9 to slide in the metal shell 1, the possibility of deformation of the navigation body 9 is reduced, so as to provide double protection for the navigation body 9.
[0041] More specifically, refer to Figure 1 , a protruding mounting block is provided at one end of the metal inner shell 3 near the middle of the navigation body 9, and a mounting hole is provided on the outer shell of the navigation body 9, and a mounting bolt is used to pass through the protruding mounting block to fix the metal inner shell 3 on the outer shell of the navigation body 9. Abutment blocks are provided at the edges of the metal outer shell 1 and the metal inner shell 3 near the length direction of the navigation body 9, and the abutment block of the metal outer shell 1 abuts against the metal inner shell 3, and the abutment block of the metal inner shell 3 abuts against the metal outer shell 1, and the abutment blocks of the metal outer shell 1 and the metal inner shell 3 are arranged alternately. In this embodiment, the abutment block of the metal inner shell 3 is arranged on one side near the end of the navigation body 9, and the abutment block of the metal outer shell 1 is arranged on one side near the middle of the navigation body 9, and the buffer layer 2 is sandwiched in the interlayer space formed between the abutment block of the metal inner shell 3 and the end of the metal outer shell 1, and the buffer stretching member 4 is arranged in the interlayer space between the abutment block of the metal outer shell 1 and the protruding mounting block, and the end of the buffer stretching member 4 away from the connecting fixing rod 5 abuts against the protruding mounting block of the metal inner shell 3. When the metal shell 1 is impacted and deformed laterally, the buffer cushion layer 2 first pushes the buffer stretching member 4 to deform laterally by connecting the fixing rod 5. When the lateral deformation of the buffer stretching member 4 moves to the limit, it can drive the metal inner shell 3 to move slightly inside the metal shell 1 to provide buffering protection for the navigation body 9.
[0042] In one embodiment of the present application, the metal shell 1 and the metal inner shell 3 are made of aluminum alloy. As a lightweight and high-strength metal material, the density of aluminum alloy is much lower than that of pure steel. Therefore, the aluminum alloy material can significantly reduce the overall weight while maintaining the structural stability of the metal shell 1 and the metal inner shell 3. In addition, the aluminum alloy has good metal ductility. When the metal shell 1 and the metal inner shell 3 are deformed by impact, the aluminum alloy can bend naturally and has good self-repairing ability, thereby maintaining the shape structure of the multi-mode buffer load reduction structure. At the same time, the aluminum alloy also has good corrosion resistance and can resist the erosion of various environmental factors, such as moisture, salt spray and some chemical substances, thereby extending the service life of the metal shell 1 and the metal inner shell 3 and reducing maintenance costs. In other embodiments, other materials with the same performance can also be used to replace the aluminum alloy, such as carbon fiber materials; and the material of the metal inner shell 3 can also be replaced with titanium alloy, maintaining higher strength to protect the navigation body 9 and reducing the possibility of deformation of the appearance of the navigation body 9.
[0043] The cushion layer 2 is specifically made of polyurethane foam. As a lightweight and high-strength material, polyurethane foam has excellent compression resilience and can be deformed quickly to absorb energy when impacted by external force, and then can be quickly restored to its original shape, thereby effectively reducing the impact force on the metal inner shell 3 and the internal navigation body 9; in addition, polyurethane foam also has good thermal insulation performance, which can improve the environmental adaptability of the metal inner shell 3 and the internal navigation body 9. In other embodiments, the cushion layer 2 can also be made of other materials with good elasticity and waterproof properties, such as silicone rubber and other materials.
[0044] More specifically, the buffer layer 2 is bonded to the metal inner shell 3 using an adhesive with good temperature resistance and high strength. The buffer stretching member 4 is specifically configured as a telescopic spring, one end of which is welded to the protruding mounting block of the metal inner shell 3, and the other end is welded to the end of the fixing rod 5 close to the protruding mounting block of the metal inner shell 3, so that the buffer layer 2 pushes the fixing rod 5 to undergo lateral deformation. In other embodiments, the buffer stretching member 4 can also use other materials with good elasticity to replace the telescopic spring, such as silicone rubber, polyurethane rubber, chloroprene rubber, etc.
[0045] As a preferred embodiment of the present application, the thickness of the metal outer shell 1 can be set at 2.5-10mm, and the minimum thickness is not less than 2.5mm, so as to protect the outer shell of the navigation body 9; the thickness of the metal inner shell 3 is set to 3mm, and the thickness of the buffer layer 2 can be preferably set between 18-25mm. In this embodiment, the buffer layer 2 is set to 20mm. In other embodiments, the thickness of the buffer layer 2 can also be adapted according to specific size requirements. In order to maintain the minimum buffering performance required by the metal inner shell 3 and the navigation body 9 inside it, the buffer layer 2 is not less than 18mm. The length of the buffer stretching member 4 can be set between 10-30mm. In this embodiment, the buffer stretching member 4 is specifically set to 10mm.
[0046] When the deformation compression of the buffer stretching member 4 reaches the extreme value, in order to facilitate the slight displacement of the navigation body 9 in the metal outer shell 1, a margin adjustment member is also provided on the metal inner shell 3. The margin adjustment member is specifically arranged in the middle part of the length direction of the navigation body 9. The margin adjustment member can facilitate the movement of the navigation body 9 in the metal outer shell 1.
[0047] Reference Figure 1 and Figure 2 , a margin chute 7 is provided between the metal shell 1 and the middle of the navigation body 9, the length direction of the margin chute 7 is parallel to the length direction of the metal shell 1, the margin adjustment part includes a movable slider 6, the movable slider 6 is slidably arranged in the margin chute 7, and the movable slider extends from the margin chute 7 and is fixedly connected to the surface of the navigation body 9, the movable slider 6 can drive the navigation body 9 to slide in the margin chute 7, so as to facilitate the relative sliding between the navigation body 9 and the metal shell 1. In this embodiment, the middle end of the navigation body 9 is still wrapped with a metal inner shell 3, and a perforation is provided on the metal inner shell 3 at the position of the margin chute 7, for the movable slider 6 to penetrate and connect with the surface of the navigation body 9. In order to further facilitate the relative movement of the navigation body 9 in the metal shell 1, a plurality of margin chute 7 can be arranged at intervals on the metal shell 1, and a movable slider 6 is installed in each margin chute 7, so as to make the movement of the navigation body 9 more convenient.
[0048] Further, refer to Figure 1, a buffer protection member 8 is also sleeved on the outside of the connecting and fixing rod 5, and the upper and lower top surfaces of the buffer protection member 8 are respectively in contact with the metal outer shell 1 and the metal inner shell 3 to provide buffer support for the connecting and fixing rod 5. In this embodiment, the buffer protection member 8 is specifically sandwiched between the abutment block of the metal outer shell 1 and the abutment block of the metal inner shell 3, and can transition the hard abutment between the abutment block of the metal outer shell 1 and the abutment block of the metal inner shell 3 to extend the service life. The buffer protection member 8 is made of silicone rubber, which has excellent weather resistance, high temperature and low temperature resistance, and excellent chemical stability. This material can still maintain stable physical and chemical properties under extreme temperature conditions, and is not easy to age, deform or fail, so that the buffer protection member 8 still has good reliability and safety during long-term use. In addition, the silicone rubber also has excellent electrical insulation and biocompatibility, which further improves the protection performance of the buffer protection member 8. In other embodiments, the buffer protection member 8 can also be made of other materials with good elasticity, such as polyurethane foam and other materials.
[0049] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.
[0050] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0051] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.
Claims
1. A multi-mode buffering and load-reducing structure for solving the impact load of a navigation body, characterized in that: It includes: A shell assembly, the shell assembly comprising a metal outer shell (1) and a metal inner shell (3), the metal inner shell (3) being used to cover the outside of a navigation body (9), and the metal outer shell (1) being arranged on the outside of the metal inner shell (3); A longitudinal buffer, the longitudinal buffer comprising a buffer layer (2), the buffer layer (2) being sandwiched between the metal outer shell (1) and the metal inner shell (3); And, a transverse buffer assembly, the transverse buffer assembly comprising a connecting and fixing rod (5) and a buffer stretching member (4), the two ends of the connecting and fixing rod (5) being respectively connected to the buffer cushion layer (2) and the buffer stretching member (4), and the end of the buffer stretching member (4) away from the connecting and fixing rod (5) being connected to the end of the metal inner shell (3) away from the buffer cushion layer (2).
2. According to claim 1, a multi-mode buffering and load-reducing structure for solving the impact load of a navigation body is characterized in that: The metal inner shell (3) is also provided with a margin adjustment member, which is arranged in the middle of the navigation body (9) and is used to drive the navigation body (9) and the metal outer shell (1) to move relative to each other.
3. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 2, characterized in that: The metal shell (1) is provided with a residual amount chute (7), and the length direction of the residual amount chute (7) is parallel to the length direction of the metal shell (1); The margin adjustment member comprises a movable slider (6), the movable slider (6) being slidably arranged in the margin slide groove (7), and the movable slider (6) extending from the margin slide groove (7) and being used to be connected to the surface of the navigation body (9).
4. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 1, characterized in that: The outer sleeve of the connecting and fixing rod (5) is provided with a buffer protection piece (8), and the two ends of the buffer protection piece (8) are respectively in contact with the metal outer shell (1) and the metal inner shell (3).
5. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 4, characterized in that: The buffer protection member (8) is configured as organic silicon rubber.
6. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 1, characterized in that: The cushion layer (2) is configured as polyurethane foam.
7. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 1, characterized in that: The thickness of the buffer layer (2) is not less than 18 mm.
8. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 1, characterized in that: The buffer stretching member (4) is configured as a telescopic spring.
9. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 1, characterized in that: The length of the buffer stretching member (4) is set between 10-30 mm.
10. The multi-mode buffering and load-reducing structure for solving the impact load of a navigation body according to claim 1, characterized in that: The metal outer shell (1) and the metal inner shell (3) are both made of aluminum alloy.