A high overload buffer device suitable for limited space and design method

Abstract

The present invention relates to high-impact buffering and protection technology, specifically disclosing a high-overload buffering device suitable for confined spaces and its design method. The device comprises an open thin-walled tube, a buffer platform, and a mounting structure. The mounting structure is provided with a mounting cavity, the open thin-walled tube is disposed within the mounting cavity, and the buffer platform is disposed within the open thin-walled tube. The present invention has the advantage that when the open thin-walled tube is expanded for buffering, the effective space occupied by the expanded tube is distributed radially rather than axially. The entire length of the small straight section of the open thin-walled tube participates in buffering, occupying a small effective space and being suitable for confined spaces.

Description

Technical Field

[0001] The present invention relates to the technical field of high-impact buffering protection, and in particular to a high-overload buffering device suitable for a limited space and a design method thereof. Background Art

[0002] When the overall overload amplitude of the structure is 10 4 Under the impact scenario of g level and duration of 2ms to 10ms, the ability of delicate and vulnerable parts inside the structure to withstand the impact overload is limited. For example, the limit overload is 10 3 g or less, it is necessary to ensure that it can effectively survive the impact for 2ms or longer and perform normal functions. To this end, it is necessary to study the buffering and protection measures for precision and vulnerable components in high overload environments within the limited space inside the structure.

[0003] Common buffering and protection measures currently used at home and abroad include compression buffering of porous foam materials, compression of thin-walled tubes with various cross-sectional shapes such as round / square, bending of thin plates, compression of negative Poisson's ratio origami structures, and other structural component compression damage buffering. For buffering and protection applications of delicate and fragile targets within the limited space of load-bearing structures in high overload environments, common buffering methods have three main shortcomings:

[0004] (1) The applicability of the buffer structure itself to high overload environments was not examined. Under high overload conditions, the buffer structure itself may collapse, weakening or even completely losing its buffering capacity, such as low-strength foam materials.

[0005] (2) Low utilization of effective space. After buffering, the buffer structure will occupy a large amount of space along the direction of movement of the load-bearing structure. For example, the minimum volume of the foam material after compression is as high as 40% of the original volume. After the buffer structure is compressed and destroyed, it will occupy a large amount of effective space. After buffering, the structure will prevent the further movement of the buffer protection target.

[0006] (3) The buffer support reaction force is not stable. Whether it is the foam material or the structural component compression failure, it will involve large deformation or even destruction of the material, including problems such as structural buckling and instability, inducing buffer support reaction force oscillation, which is not conducive to the efficient use of limited space. Summary of the Invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high overload buffer device and design method suitable for limited space. 4 In the high overload environment of overall impact of g level and duration of 2ms to 10ms, the ultimate bearing capacity is guaranteed within the limited space inside the structure. 3 The effective survival and function of missile-borne precision vulnerable parts below g within 2ms and longer.

[0008] The object of the present invention is achieved through the following technical solution: A high overload buffer device suitable for limited space, including an open thin-walled tube, a buffer platform and a carrying structure, the carrying structure is provided with an installation cavity, the open thin-walled tube is arranged in the installation cavity, and the buffer platform is arranged in the open thin-walled tube.

[0009] Specifically, the open thin-walled tube includes a large diameter section, a conical section and a small diameter section. The large diameter section and the small diameter section are connected by the conical section. The upper end of the buffer platform is a cylindrical section and the lower end is a conical section. The cylindrical section and the conical section of the buffer platform are respectively fitted with the inner walls of the large diameter section and the conical section of the open thin-walled tube.

[0010] Specifically, the installation cavity is a stepped hole, and a connecting ring is provided at one end of the large-diameter section, and the connecting ring is connected to the step of the installation cavity.

[0011] Specifically, the interface lubricant is evenly applied on the inner wall of the open thin-walled tube and the outer wall of the buffer platform.

[0012] Specifically, the half cone angle of the cone segment is ≤15°.

[0013] A method for designing a high-overload buffer device suitable for a limited space comprises the following steps:

[0014] S1. Determine the required range of the support reaction force F1 for the expansion of the open thin-walled tube based on the overload amplitude requirement of the buffer protection target;

[0015] S2. Determine the key geometric parameter ranges of the tapered section of the open thin-walled tube: the wall thickness δ of the open thin-walled tube must meet the thin-wall requirement, i.e., δ≤0.1R1, where R1 is the inner radius of the large-diameter section of the open thin-walled tube; and the semi-cone angle α of the tapered section of the open thin-walled tube must meet α≤15°.

[0016] S3. According to the support reaction force requirements of the open thin-walled tube, the relationship between the key parameters of the open thin-walled tube is determined. The support reaction force of the open thin-walled tube can be expressed as:

[0017]

[0018] Wherein, B = 2.3π·σ2·(R2+δ2)·δ, the support reaction force is a function of the inner hole radius R1 of the large diameter section of the open thin-walled tube, the inner hole radius R2 of the small diameter section, the wall thickness δ of the open thin-walled tube, the semi-cone angle α of the cone section, the length l of the cylindrical section with a radius R1 of the buffer platform, and the interface dynamic friction coefficient η between the buffer platform and the open thin-walled tube. The strength σ2 of the open thin-walled tube material takes into account the strain hardening and strain rate strengthening effects of the thin-walled tube during diameter expansion. The specific function form is determined through dynamic mechanical property tests of the open thin-walled tube material. Based on the actual size of the buffer protection target and in combination with the support reaction force requirement determined in step S1, multiple combinations of key parameters of the buffer device are determined under the parameter constraints of step S2.

[0019] S4. Structural Strength Design of Open Thin-Walled Tubes in High Overload Environments: The high overload of the mounting structure is transmitted to the open thin-walled tubes through the mounting structure's steps. The structural strength design of the open thin-walled tubes considers the impact of the high overload of the mounting structure and the buffer expansion process, taking into account the strength design margin. Among the multiple parameter combinations designed in step S3, a parameter combination that simultaneously satisfies the strength design is determined to maintain the structural stability of the buffer device in high overload environments.

[0020] S5. Determine the length L of the small diameter section of the open thin-walled tube: The length L of the small diameter section of the open thin-walled tube determines the total buffering time of the open thin-walled tube, that is, the effective buffering time T, which is required to meet the following relationship:

[0021]

[0022] Where, v1 is the moving speed of the buffer platform along the axial direction of the open thin-walled tube; v2 is the moving speed of the carrying structure along the axial direction of the open thin-walled tube;

[0023] S6. Evaluate the increase in volume occupied by the buffer device after buffering is completed: After the buffering is completed by expanding the diameter of the open thin-walled tube, the increase in the volume occupied by the entire buffer device compared to the volume occupied by the device before buffering is determined by the following formula:

[0024] ΔV=πL[(R1+δ) 2 -(R2+δ) 2 ]+πcotα(R1-R2)(R1+δ) 2

[0025] Where L is the length of the small diameter section of the open thin-walled tube, R1 is the inner diameter radius of the large diameter section of the open thin-walled tube, R2 is the inner diameter radius of the small diameter section, δ is the wall thickness of the open thin-walled tube, and α is the semi-cone angle of the cone section;

[0026] S7. Numerical simulation is used to evaluate whether the buffering performance of the buffer device is consistent with the design expectations: Based on steps S1 to S6, the key geometric parameters and interface dynamic friction coefficient of the buffer device are determined, a full-size buffering model of the buffer device is established, and a numerical simulation of the buffering process is carried out. The contact force between the open thin-walled tube and the buffer platform is extracted, and its compliance with the overload design value after buffering is evaluated. If there is a large deviation, the structural parameters of the buffer device will be corrected based on the numerical simulation results.

[0027] The present invention has the following advantages:

[0028] 1. Adapt to high overload environments. The influence of high overload environments and the expansion process are jointly considered in the strength design of thin-walled tubes to maintain the structural stability and buffering effectiveness of the buffer structure itself in high overload environments, and the designed structure is suitable for high overload environments.

[0029] 2. The structure is simple and the overload amplitude after buffering is easy to control. The key core component of the high overload buffer device suitable for limited space of the present invention is an open thin-walled tube, which has a simple structure and the geometric shape of its buffer section is determined by 4 independent geometric parameters, including: wall thickness, diameter of large diameter section, diameter and length of small diameter section. By changing the 4 independent geometric parameters and material types, the overload amplitude and duration after buffering can be controlled. The overload of the precision and vulnerable parts in the carrying structure is reduced to 10 3 Buffer protection target with g below and duration above 2ms.

[0030] 3. Smooth overload after buffering. Buffering is achieved by expanding the diameter of the open thin-walled tube. During the expansion process, the thin-walled tube undergoes limited, uniform and constant plastic deformation, which stabilizes the reaction force and provides a smooth overload after buffering.

[0031] 4. Small effective space occupied, suitable for limited spaces. When the open thin-walled tube is expanded for buffering, the effective space occupied after the expansion is distributed in the radial direction rather than the axial direction of the tube. The entire length of the small straight section of the open thin-walled tube participates in the buffering, occupying a small effective space, suitable for limited spaces.

[0032] 5. Widely applicable in high-overload impact scenarios. The buffer device can be used to protect delicate and vulnerable components carried by projectiles during penetration overloads. It can also be extended to protect vulnerable core components within structural targets in other high-overload environments, including high-speed impacts and explosive loading. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the buffer device of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the buffer device of the present invention after buffering;

[0035] Figure 3This is a schematic diagram of the structure of an open thin-walled tube according to the present invention;

[0036] Figure 4 This is a schematic diagram of the buffer platform structure of the present invention;

[0037] Figure 5 This is a diagram showing the buffering effect of the buffer device of the present invention;

[0038] In the figure: 1-carrying structure, 2-open thin-walled tube, 21-small diameter section, 22-conical section, 23-large diameter section, 24-connecting ring, 3-installation cavity, 4-buffer platform, 41-cylindrical section, 42-conical section, 5-buffer protection target. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein can be arranged and designed in various different configurations and connections.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely intended to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0041] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0042] The present invention will be further described below in conjunction with the accompanying drawings, but the scope of protection of the present invention is not limited to the following. Figure 1-Figure 5As shown, a high overload buffer device suitable for a limited space includes an open thin-walled tube 2, a buffer platform 4 and a carrying structure 1, the carrying structure 1 is provided with a mounting cavity 3, the open thin-walled tube 2 is arranged in the mounting cavity 3, the buffer platform 4 is arranged in the open thin-walled tube 2, the open thin-walled tube 2 includes a large diameter section 23, a conical section 22 and a small diameter section 21, the large diameter section 23 is connected to the small diameter section 21 through the conical section 22, the upper end of the buffer platform 4 is a cylindrical section 41, and the lower end is a conical section 42, the cylindrical section 41 and the conical section 42 of the buffer platform 4 are respectively fitted with the inner walls of the large diameter section 23 and the conical section 22 of the open thin-walled tube 2. The buffer device in this embodiment connects the carrying structure 1 and the buffer protection target 5; an installation cavity 3 is provided in the carrying structure 1, and the open thin-walled tube 2 is installed in the installation cavity 3, and the axis of the open thin-walled tube 2 is parallel to the overload direction to be buffered by the carrying structure 1; the high impact load experienced by the carrying structure 1 is transmitted to the open thin-walled tube 2; the buffer platform 4 is filled in the open thin-walled tube 2, the outer surface of the buffer platform 4 is in contact with the inner wall of the open thin-walled tube 2, and the buffer platform 4 is rigidly connected to the buffer protection target 5, and the buffer platform 4 is buffered by the open thin-walled tube 2 when high overload occurs. During the buffering process, the buffer platform 4 moves along the axial direction of the open thin-walled tube 2 in the open thin-walled tube 2, and expands the conical section 22 and the small diameter section 21 of the open thin-walled tube 2. The small and constant support reaction force when the open thin-walled tube 2 is expanded is used to achieve a small amplitude change of the buffer platform 4 and the protected target 5 in a high impact overload environment. The open thin-walled tube 2 undergoes uniform and limited plastic deformation, forming a small amplitude change of the support reaction force, which acts on the buffer platform 4 and reduces the overload amplitude of the buffer platform 4; the basic idea of ​​using displacement to reduce overload is used to achieve The buffer platform 4 and the internal buffer protection target 5 are overloaded and dropped within 2ms or longer. The buffer platform 4 is made of high-strength alloy steel or other metal materials, such as 30CrMnSiA steel, etc., to maintain the outer surface of the buffer platform 4 unchanged when the open thin-walled tube 2 is expanded. The open thin-walled tube 2 is made of metal or non-metal with a cross-sectional shrinkage rate of ≥50%, such as 06Cr19Ni10 steel. The structure of the present invention is simple, the overload amplitude after buffering is easy to control, the effective space occupied is small, and it is suitable for limited space. When the open thin-walled tube 2 is expanded for buffering, the expansion The effective space occupied by the rear end is distributed in the radial direction rather than the axial direction of the tube. The small diameter section of the open thin-walled tube 2 is fully involved in buffering, and the effective space occupied is small. It is suitable for limited space and is widely applicable to high overload impact scenarios. The buffer device can be used to protect the precision and vulnerable parts of the projectile during penetration overload, and can also be promoted to protect the weak core components of the structural targets in other high overload environments. Other high impact environments include: high-speed impact, explosive loading, etc. The high overload buffer device of the present invention can realize axial buffering of the precision and vulnerable parts in the carrying structure 1, and can reduce the amplitude of 10 4The high overload of the carrying structure with a duration of 2ms to 10ms and g level is reduced to 10% of the buffer protection target. 3 g and lasting for more than 2ms, ensuring the survivability and functional integrity of the buffer protection target 5 in high impact overload environments.

[0043] Furthermore, the mounting cavity 3 is a stepped hole, and a connecting ring 24 is provided at one end of the large-diameter section 23. The connecting ring 24 is connected to the step of the mounting cavity 3. In this embodiment, the mounting cavity 3 is a stepped hole, including a large-diameter end and a small-diameter end. The large-diameter section 23, the tapered section 22, and the small-diameter section 21 of the open thin-walled tube 2 are placed within the small-diameter end, and there is an assembly clearance of 1 to 2 mm between the large-diameter section 23 and the inner wall of the large-diameter end. A connecting ring 24 is provided at the end of the large-diameter section 23. The connecting ring 24 cooperates with the step of the mounting cavity 3 to limit the position of the open thin-walled tube 2. The connecting ring 24 can be connected to the large-diameter end by threading, and the impact and high overload of the mounting structure 1 are transmitted to the open thin-walled tube 2 through the connecting ring 24.

[0044] Furthermore, an interface lubricant is evenly applied to the inner wall of the open thin-walled tube 2 and the outer wall of the buffer platform 4. In this embodiment, the interface lubricant is high temperature resistant and has good interface adhesion, such as molybdenum disulfide.

[0045] Furthermore, the half cone angle of the cone section 22 is ≤15°.

[0046] A method for designing a high-overload buffer device suitable for a limited space comprises the following steps:

[0047] S1. Determine the required range of the support reaction force F1 for the expansion of the open thin-walled tube 2 based on the overload amplitude requirement of the buffer protection target;

[0048] S2. Determine the range of geometric parameters of the tapered section 22 in the open thin-walled tube 2: the wall thickness δ of the open thin-walled tube 2 must meet the thin-wall requirement, i.e., δ≤0.1R1, where R1 is the inner radius of the large diameter section 23 of the open thin-walled tube 2; the semi-cone angle α of the tapered section 22 in the open thin-walled tube 2 must meet α≤15°; the maximum strain of the open thin-walled tube 2 during expansion is less than the material failure strain;

[0049] S3. Based on the support reaction force requirements for the open thin-walled tube 2, the relationship between the key parameters of the open thin-walled tube 2 is determined. The support reaction force of the open thin-walled tube 2 can be expressed as:

[0050]

[0051] Wherein, B=2.3π·σ2·(R2+δ2)·δ, the support reaction force is a function of the inner hole radius R1 of the large diameter section 23 of the open thin-walled tube 2, the inner hole radius R2 of the small diameter section 21, the wall thickness δ of the open thin-walled tube 2, the semi-cone angle α of the cone section 22, the length l of the cylindrical section 41 of the buffer platform 4 with a radius R1, and the interface dynamic friction coefficient η between the buffer platform 4 and the open thin-walled tube 2. The strength σ2 of the material of the open thin-walled tube 2 takes into account the strain hardening and strain rate strengthening effects when the thin-walled tube is expanded. The specific function form is determined by the dynamic mechanical properties test of the open thin-walled tube material. Based on the actual size of the buffer protection target 5 and in combination with the support reaction force requirement determined in step S1, multiple combinations of key parameters of the buffer device are determined under the parameter constraints of step S2.

[0052] S4. Structural strength design of open thin-walled tube 2 under high overload conditions: The high overload of mounting structure 1 is transmitted to open thin-walled tube 2 through the steps of mounting structure 1. The structural strength design of open thin-walled tube 2 takes into account the impact of the high overload of mounting structure 1 and the buffer expansion process, and considers the strength design margin. Among the multiple parameter combinations designed in step S3, a parameter combination that simultaneously meets the strength design requirements is determined to maintain the structural stability of the buffer device in high overload conditions.

[0053] S5. Determine the length L of the small diameter section (21) of the open thin-walled tube 2: The length L of the small diameter section 21 of the open thin-walled tube 2 determines the total buffering time of the open thin-walled tube 2, that is, the effective buffering time T, which is required to satisfy the following relationship:

[0054]

[0055] Among them, v1 is the moving speed of the buffer platform 4 along the axial direction of the open thin-walled tube 2; v2 is the moving speed of the carrying structure 1 along the axial direction of the open thin-walled tube 2;

[0056] S6. Evaluate the increase in volume occupied by the buffer device after buffering is completed: After the diameter expansion of the open thin-walled tube 2 is completed, the increase in the volume occupied by the entire buffer device compared to the volume occupied by the device before buffering is determined by the following formula:

[0057] ΔV=πL[(R1+δ) 2 -(R2+δ) 2 ]+πcotα(R1-R2)(R1+δ) 2

[0058] Wherein, L is the length of the small diameter section 21 in the open thin-walled tube 2, R1 is the inner diameter radius of the large diameter section 23 of the open thin-walled tube 2, R2 is the inner diameter radius of the small diameter section 21, δ is the wall thickness of the open thin-walled tube 2, and α is the semi-cone angle of the cone section 22. Sufficient space is designed according to the above formula to ensure that the buffer device can complete all buffering functions;

[0059] S7. Numerical simulation is used to evaluate whether the buffering performance of the buffer device is consistent with the design expectations: Based on steps S1 to S6, the key geometric parameters and interface dynamic friction coefficient of the buffer device are determined, a full-size buffering model of the buffer device is established, and a numerical simulation of the buffering process is carried out. The contact force between the open thin-walled tube 2 and the buffer platform 4 is extracted, and its compliance with the overload design value after buffering is evaluated. If there is a large deviation, the structural parameters of the buffer device will be corrected based on the numerical simulation results.

[0060] Control of overload amplitude and duration after buffering: By changing the inner diameter R1 of the large diameter section 23, the inner diameter R2 of the small diameter section 21, and the wall thickness δ of the open thin-walled tube 1, the performance of the interface lubricant is changed to control the overload amplitude of the buffer protection target 5 and the buffer platform 4 after buffering; by changing the length L of the small diameter section 21 in the open thin-walled tube 2, the duration of the overload of the buffer protection target 5 and the buffer platform 4 after buffering is changed; the 10 4 Overloads of the order of g and duration of 2ms to 10ms are reduced to a value of 10 at the buffer protection target of 5. 3 g. Buffer protection for overloads lasting 2ms or longer.

[0061] Research on the functional realization of the missile-borne precise and fragile buffer protection target 5 during penetration by a high-overload buffer device suitable for confined space: The missile-borne precise and fragile buffer protection target 5 is connected to the projectile body through a high-overload buffer device suitable for confined space, and the key parameters of the buffer device are determined through steps S1 to S7. The functional realization reliability of the missile-borne precise and fragile buffer protection target 5 in penetration tests at different impact speeds is studied.

[0062] High overload buffer device suitable for limited space is used to achieve high impact environment (overload amplitude is 10 4 The survivability of a buffering and protective target 5 under high-impact conditions (with a g-level and duration of 2ms to 10ms) is studied. The buffering and protective target 5 can be a precision instrument such as an electronic recorder or guidance module. A high-overload buffer device suitable for confined spaces is used to connect the buffering and protective target 5 to the carrier structure 1. The survivability of the buffering and protective target 5 is studied when the carrier structure 1 is subjected to different high-impact environments.

[0063] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention using the above technical content, or modify it into an equivalent embodiment with equivalent changes. Therefore, any changes, modifications, equivalent changes, and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the present technical solution.

Claims

1. A design method for a high overload buffer device suitable for a limited space, characterized by: The following steps are involved: S1. Determine the support reaction force for the expansion of the open thin-walled tube (2) based on the overload amplitude requirement of the buffer protection target. Scope of demand; S2. Determine the key geometric parameter range of the cone section (22) of the open thin-walled tube (2): the wall thickness of the open thin-walled tube (2) It is required to meet the thin wall requirements, that is ,in, is the inner diameter radius of the large diameter section (23) of the open thin-walled tube (2), and the semi-cone angle of the middle cone section (22) of the open thin-walled tube (2) Requirements met ; S3. Based on the support reaction force requirement of the open thin-walled tube (2), the relationship between the key parameters of the open thin-walled tube (2) is determined. The support reaction force of the open thin-walled tube (2) can be expressed as: in, The support reaction force is the inner diameter radius of the large diameter section (23) of the open thin-walled tube (2). , the inner diameter radius of the small diameter section (21) , Wall thickness of open thin-walled tube (2) , the half cone angle of the cone segment (22) , the radius of the buffer platform (4) is Length of cylindrical segment (41) and a function of the interface dynamic friction coefficient η between the buffer platform (4) and the open thin-walled tube (2), the strength of the material of the open thin-walled tube (2) Taking into account the strain hardening and strain rate strengthening effects of thin-walled tubes during diameter expansion, the specific function form is determined through dynamic mechanical properties tests of open thin-walled tube materials; based on the actual size of the buffer protection target (5), combined with the support reaction force requirements determined in step S1, multiple combinations of key parameters of the buffer device are determined under the parameter constraints of step S2; S4. Structural strength design of the open thin-walled tube (2) under high overload conditions: The high overload of the carrying structure (1) is transferred to the open thin-walled tube (2) through the steps of the carrying structure (1). The structural strength design of the open thin-walled tube (2) jointly considers the influence of the high overload of the carrying structure (1) and the buffer expansion process, and considers the strength design margin; among the multiple groups of parameter combinations designed in step S3, determine the parameter combination that satisfies the strength design at the same time, and maintain the structural stability of the buffer device in the high overload environment; S5. Determine the length of the small diameter section (21) of the open thin-walled tube (2) : Length of the small diameter section (21) of the open thin-walled tube (2) Determine the total duration of buffering of the open thin-walled tube (2), i.e. the effective buffering time , which requires the following relationship to be satisfied: in, The movement speed of the buffer platform (4) along the axial direction of the open thin-walled tube (2); is the speed of movement of the carrying structure (1) along the axial direction of the open thin-walled tube (2); S6. Evaluate the increase in volume occupied by the buffer device after the buffering is completed: After the diameter expansion of the open thin-walled tube (2) is completed, the increase in the volume occupied by the entire buffer device compared to the volume occupied by the device before the buffering is determined by the following formula: Wherein, L is the length of the small diameter section (21) of the open thin-walled tube (2), is the inner diameter radius of the large diameter section (23) of the open thin-walled tube (2), is the inner diameter radius of the small diameter section (21), is the wall thickness of the open thin-walled tube (2), is the half cone angle of the cone segment (22); S7. Numerical simulation is used to evaluate whether the buffering performance of the buffer device is consistent with the design expectations: Based on steps S1 to S6, the key geometric parameters and interface dynamic friction coefficient of the buffer device are determined, a full-size buffering model of the buffer device is established, and a numerical simulation of the buffering process is carried out to extract the contact force between the open thin-walled tube (2) and the buffer platform (4). The degree of compliance with the overload design value after buffering is evaluated. If there is a large deviation, the structural parameters of the buffer device will be corrected based on the numerical simulation results.

2. A high overload buffer device suitable for a limited space, utilizing the design method for a high overload buffer device suitable for a limited space according to claim 1, characterized in that: The buffer device is arranged on the carrying structure (1), and the buffer device includes an open thin-walled tube (2) and a buffer platform (4). The carrying structure (1) is provided with a mounting cavity (3), the open thin-walled tube (2) is arranged in the mounting cavity (3), and the buffer platform (4) is arranged in the open thin-walled tube (2).

3. A high overload buffer device suitable for limited space according to claim 2, characterized in that: The open thin-walled tube (2) comprises a large diameter section (23), a tapered section (22) and a small diameter section (21); the large diameter section (23) and the small diameter section (21) are connected via the tapered section (22); the upper end of the buffer platform (4) is a cylindrical section (41) and the lower end is a tapered section (42); the cylindrical section (41) and the tapered section (42) of the buffer platform (4) are respectively fitted with the inner walls of the large diameter section (23) and the tapered section (22) of the open thin-walled tube (2).

4. The high overload buffer device suitable for limited space according to claim 3, characterized in that: The installation cavity (3) is a stepped hole, and a connecting ring (24) is provided at one end of the large-diameter section (23), and the connecting ring (24) is connected to the step of the installation cavity (3).

5. The high overload buffer device suitable for limited space according to claim 3, characterized in that: The inner wall of the open thin-walled tube (2) and the outer wall of the buffer platform (4) are evenly coated with an interface lubricant.

6. The high overload buffer device suitable for limited space according to claim 3, characterized in that: The half cone angle of the cone section (22) is ≤15°.

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