A spatial all-round self-locking series thin-walled tube energy absorption system

Abstract

The present invention discloses a spatial all-round self-locking series thin-walled tube energy absorption system, which is a thin-walled tube structure made of metal material. The energy absorption system is composed of a number of series thin-walled tubes that are staggered and interlocked. The cross-sectional shape of the series thin-walled tube substructure is four long elliptical strips formed by three groups of parallel thin plates with equal spacing in series. The present invention achieves the self-locking of the structural parts of the energy absorption system under the impact of multiple directions in space through the optimized design of the series thin-walled tubes, that is, there is no splashing of the tubes and the energy absorption is stable, which overcomes the defect of the traditional self-locking energy absorption system that the load direction is single. Compared with the prior art, the advantages of the present invention are: the energy absorption system can achieve rapid expansion in three-dimensional directions and is not limited by the size of the thin-walled tube substructure, that is, the external size of the energy absorption system can be flexibly adjusted according to the actual collision energy and the size of the working surface, which is more conducive to the energy absorption system to cope with complex working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of thin-walled tube energy absorption systems, and more specifically, to a spatial all-round self-locking series thin-walled tube energy absorption system. The energy absorption system can be applied to aerospace, shipbuilding, automobile and other transportation and protection systems for important facilities that need to resist impact and shock absorption. Background Art

[0002] In recent years, with the vigorous development of transportation and engineering construction in my country, collision and explosion accidents have occurred frequently, causing great damage to life safety and property. Therefore, in order to deal with emergency collision and explosion accidents, it is of great significance to design an energy absorption system with high energy absorption efficiency, good energy absorption stability and convenient disassembly and assembly. At present, many researchers are studying energy absorption systems.

[0003] Metal thin-walled tubes are widely used in energy absorption devices due to their light weight, simple processing technology, and low cost. At the same time, metal thin-walled tubes have the advantages of low relative density, low stiffness, and strong deformation under impact, and are widely used in the fields of collision prevention and impact resistance. However, considering the complex working conditions, the traditional structure can no longer meet the configuration requirements of buffer devices in large engineering fields. Therefore, it is of great significance to study the energy absorption system of metal thin-walled tube combination structure that can provide better energy absorption and simple cross-sectional structure.

[0004] Traditional energy absorption devices often use round tubes, circular rings, square tubes, etc., because they are easy to process, low in cost and can provide a long pressure stroke. However, the traditional combined structure will splash laterally under the impact, which will not only cause secondary damage, but also have defects such as unstable energy absorption and low energy absorption efficiency, and cannot play a good safety protection effect. In order to make up for these defects, the measures commonly used in engineering are: 1. Setting a constraint baffle at the boundary of the energy absorption system to prevent the pipe from splashing laterally; 2. Setting mechanical connectors between each pipe or welding the pipe to constrain the lateral displacement of the combined structure. However, the above measures all take a long time, and the assembly of energy absorption devices is not ideal for dealing with emergencies. In order to solve the defects of the traditional thin-walled circular tube energy absorption system, the dumbbell-shaped thin-walled tube structure has been proposed before. This system can reduce the time and labor cost of disassembly and assembly, and the impacted circular tube will not splash laterally, but the self-locking direction of the pipe system is single and cannot cope with complex working conditions. A multi-dimensional self-locking thin-walled ball string energy absorption system has been proposed before, which overcomes the defect that the traditional one-way self-locking energy absorption system can only withstand loads in a single specific direction and remain self-locking. However, the three-dimensional expansion degree of the system depends on the size of the thin-walled tube structure, and its practical application has limitations.

[0005] Therefore, designing an energy absorption system with good energy absorption stability, high energy absorption efficiency, and strong mechanical programming performance is of great value for improving material utilization, reducing the cost of the protection system, resisting collisions under complex working conditions, and reducing the loss of life and property. Summary of the invention

[0006] In order to solve the problem that the existing thin-walled tube energy absorption system in the background technology has poor expansion effect in three-dimensional space, the present invention provides a spatial all-round self-locking series thin-walled tube energy absorption system, which can achieve rapid expansion in three-dimensional directions without being restricted by the structural size of the thin-walled tube, and can resist multi-directional impact and collision in space, providing more effective, economical and safe protection for the protection system to serve under complex working conditions.

[0007] The embodiments of the present invention can be implemented as follows:

[0008] An embodiment of the present invention provides a spatially all-round self-locking series thin-walled tube energy absorption system, characterized in that each series thin-walled tube substructure is composed of four long elliptical tubes and three groups of parallel thin plates in series, and a plurality of series thin-walled tube substructures are arranged in a staggered manner in a form of one advance and one retreat and adjacent thin-walled tubes are equally spaced, so as to achieve expansion of the system in the Y-axis direction, and the second layer is expanded along the X-axis in the same arrangement and vertically overlapped on the first layer to complete the overlap of a group of series thin-walled tubes, and a plurality of groups of series thin-walled tubes are staggered and stacked to achieve longitudinal expansion of the energy absorption system in the Z-axis direction, and the remaining layers are combined in a multi-row and multi-column manner to form a combined structure, so as to achieve the effect of self-locking of adjacent structural parts in the combined thin-walled tube structure during an all-round impact in space.

[0009] The thin-walled tube substructure cross section is four long elliptical tubes of the same size connected in series by parallel thin plates at equal intervals, and the width H of the parallel thin plates and the width N of the main tube satisfy H=N;

[0010] The length W and width N of the main tube of the thin-walled tube substructure satisfy W=3N;

[0011] The fillet radius R of the thin-walled tube substructure and the width N of the main tube satisfy R=2N;

[0012] The axial length L of the thin-walled tube substructure and the width N of the main tube satisfy L=N.

[0013] Furthermore, in the XY axis plane, several series-connected thin-walled tube substructures are staggered in an advance-and-retreat manner, and the front-to-back offset distance between the ends of two adjacent thin-walled tubes is the width of a parallel thin plate and the axial length of the main tube, that is, the offset distance is H+L, and the interval between two adjacent thin-walled tubes is the width N of a main tube. The thin-walled tube substructures along the Z axis are stacked in a criss-cross manner as a group, and several groups of staggered stacks are assembled into a three-dimensional structure, so that the combined structure can be rapidly expanded in the three-dimensional direction without being limited by the size of the thin-walled tube substructure.

[0014] Furthermore, the number of series-connected thin-walled tube substructures extending in the XY-axis plane is not less than 2n, and n≥2, and the number of groups extending along the Z-axis is not less than 2.

[0015] Furthermore, the energy absorption system material is a metal thin-walled tube structure.

[0016] The principle of the present invention is:

[0017] A space-wide self-locking series thin-walled tube energy absorption system is a thin-walled tube structure made of metal material. The energy absorption system is composed of a plurality of series thin-walled tubes arranged alternately at intervals, so that the combined structure can be rapidly expanded in three-dimensional directions without being restricted by the size of the thin-walled tube substructures; the shape ratio of the series thin-walled tube substructures and the arrangement of the energy absorption system enable the adjacent structures to achieve a self-locking effect during the space-wide impact process. The beneficial effects of the invention are as follows:

[0018] 1. The present invention provides a spatial all-round self-locking series thin-walled tube energy absorption system, which can realize self-locking of structural parts in the process of bearing all-round impact in space, that is, there is no need to set a constraint boundary displacement baffle or set a connector between adjacent pipes, thus meeting the comprehensive requirements of safety, economy, applicability and other characteristics of the protection system.

[0019] 2. The present invention provides a spatial all-round self-locking series thin-walled tube energy absorption system. A plurality of series thin-walled tubes are arranged in a staggered manner with equal spacing and crisscross stacking of upper and lower layers of thin-walled tubes. Without the need to set external or internal connecting accessories, the combined structure can be rapidly expanded in three dimensions without being restricted by the size of the thin-walled tube substructure, thereby improving the protection system's ability to cope with complex working conditions.

[0020] 3. The present invention provides a spatial all-round self-locking series thin-walled tube energy absorption system. The energy absorption system is composed of a number of series-connected thin-walled tube sub-structures. The number of thin-walled tube sub-structures and the number of layers of the energy absorption system can be flexibly adjusted according to the actual collision energy and the size of the working surface. The energy absorption system has good programmability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the series-connected thin-walled tubes involved in the present invention.

[0023] Figure 2 It is a schematic cross-sectional view of the structure of the series-connected thin-walled tubes involved in the present invention.

[0024] Figure 3 This is a schematic diagram of the assembly of a group of series-connected thin-walled tube combined structures involved in the present invention.

[0025] Figure 4 This is a schematic diagram of the assembly of the energy absorption system involved in the present invention.

[0026] Figure 5 It is a three-dimensional expansion schematic diagram of the energy absorption system involved in the present invention.

[0027] Figure 6 It is a schematic diagram of the load-bearing deformation of the energy absorption system in the Z-axis direction in the numerical simulation of the embodiment involved in the present invention.

[0028] Figure 7 It is a schematic diagram of the force-displacement curve of the energy absorption system under load in the Z-axis direction in the numerical simulation of the embodiment involved in the present invention.

[0029] Figure 8 It is a schematic diagram of the load-bearing deformation of the energy absorption system in the X-axis direction in the numerical simulation of the embodiment involved in the present invention.

[0030] Fig. 9 It is a schematic diagram of the force-displacement curve of the energy absorption system under load in the X-axis direction in the numerical simulation of the embodiment involved in the present invention.

[0031] Fig.10 It is a schematic diagram of the load-bearing deformation of the energy absorption system in the direction of an angle of 45 degrees in the XZ-axis plane in the numerical simulation of the embodiment involved in the present invention.

[0032] Fig.11 It is a schematic diagram of the force-displacement curve of the energy absorption system under load at an angle of 45 degrees in the XZ-axis plane in the numerical simulation of the embodiment involved in the present invention.

[0033] Figure 1 Middle: A. Main tube A of the series-connected thin-walled tube substructure; B. Main tube B of the series-connected thin-walled tube substructure.

[0034] Figure 3 Middle: 1. The first series of thin-walled tubes arranged along the Y axis; 2. The second series of thin-walled tubes arranged along the Y axis; 3. The first series of thin-walled tubes arranged along the X axis; 4. The second series of thin-walled tubes arranged along the X axis.

[0035] Figure 4 Middle: 5. The first series of thin-walled tubes of the second group distributed along the Y axis; 6. The first series of thin-walled tubes of the third group distributed along the Y axis. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 invention.

[0040] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0041] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0043] The present invention provides a space-all-around self-locking series thin-walled tube energy absorption system. To achieve the expected self-locking effect, the structural dimensions of the thin-walled tubes can be adjusted within a proportional range as required, such as Figure 1 , Figure 2 As shown, the width H of the parallel thin plate in the thin-walled tube substructure and the width N of the main tube should satisfy H=N, the length W of the main tube and the width N should satisfy W=3N, the fillet radius R of the substructure and the width N of the main tube should satisfy R=2N, and the axial length L of the substructure and the width N of the main tube should satisfy L=N.

[0044] In order to achieve the expected self-locking effect, the series of thin-walled tubes is composed of two layers of thin-walled tubes stacked and overlapped alternately, such as Figure 3 As shown, the first layer of thin-walled tubes are arranged in an evenly spaced arrangement along the Y-axis direction, with the front and rear staggered distance between the ends of thin-walled tube 1 and thin-walled tube 2 being the width H of a parallel thin plate and the axial length L of the main tube, and the spacing distance between the two tubes being the width N of a main tube. The second layer of thin-walled tubes is extended along the X-axis direction in the same arrangement as the first layer, and the parallel thin plates of thin-walled tubes 3 and 4 are respectively attached to the parallel thin plates of tubes 2 and 1 in a direction perpendicular to the first layer. The number of series thin-walled tube substructures extended along the XY-axis plane is not less than 2n, and n≥2.

[0045] In order to achieve the expected effect of rapid expansion of the energy absorption system in three-dimensional direction without being restricted by the size of the thin-walled tube structure, the energy absorption system is made of metal material as a whole and is stacked in groups. The stacking method is: along the X-axis, the main tube A of the second group of thin-walled tubes 5 is placed in the inner groove 1, and the main tube B of the third group of thin-walled tubes 6 is placed in the inner groove of the second group. The remaining layers are staggered and interlocked in this way to achieve the expansion of the energy absorption system in the Z-axis direction. The assembly process is as follows Figure 4 shown.

[0046] In order to cope with emergencies under complex working conditions, the energy absorption system can flexibly adjust the appearance size according to the actual collision energy and the size of the working surface. The three-dimensional expansion effect is as follows: Figure 5 shown.

[0047] Embodiment: The energy absorption effect of a spatial all-round self-locking series thin-walled tube energy absorption system under loads in multiple directions in three-dimensional space is calculated through simulation. The energy absorption system is assembled by 5 groups of series thin-walled tubes, and each group of thin-walled tubes is arranged in a manner of 4 along the X-axis and 4 along the Y-axis. The parameters of a single substructure are as follows: the length of the long elliptical main tube is W=30mm, the width is N=10mm, the fillet radius is R=5mm, the distance between the parallel thin plates is S=2mm, the wall thickness t is applied inwardly by 0.5mm; the width of the parallel thin plates is H=10mm. A rigid plate with a fixed constraint is set below the energy absorption system, and a rigid plate is set above the system to assist in completing the stamping load simulation. The mass of the impact plate is 60kg, H is the height of the energy absorption system before deformation, and U is the loading displacement of the impact plate. The loading methods are:

[0048] 1. The impact plate applies a load to the energy absorption system along the Z axis at a speed of 12 m / s. The deformation of the energy absorption system after the impact is shown in Figure 6. The force-displacement curve of the simulated impact test is shown in Figure 7 shown.

[0049] 2. The impact plate applies a load to the energy absorption system at a speed of 10 m / s along the X-axis, and the energy absorption system deforms after the impact. Figure 8 As shown in Figure 2, the force-displacement curve of the simulated impact test is as follows: Fig. 9 shown.

[0050] 3. The upper plate applies a load to the energy absorption system at a speed of 10 m / s along the XZ-axis plane at an angle of 45 degrees. The deformation of the energy absorption system after the impact is shown in Figure 10. The force-displacement curve of the simulated impact test is shown in Figure 10. Fig.11 shown.

[0051] Through finite element simulation tests, a spatial all-round self-locking series thin-walled tube energy absorption system can achieve a self-locking effect of the structure under the impact of multiple directions in space, that is, there is no splashing of pipes and can stably absorb energy.

[0052] Matters not covered by the present invention are known technologies.

[0053] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A spatial all-round self-locking series thin-walled tube energy absorption system, characterized by: Each series thin-walled tube substructure is composed of four long elliptical tubes and three groups of parallel thin plates in series. Several series thin-walled tube substructures are staggered in a form of one forward and one backward with adjacent thin-walled tubes spaced at equal intervals, so as to achieve the expansion of the system in the Y-axis direction. The second layer is expanded along the X-axis in the same arrangement and vertically overlapped on the first layer to complete the overlap of a group of series thin-walled tubes. Several groups of series thin-walled tubes are stacked in an offset manner to achieve the longitudinal expansion of the energy absorption system in the Z-axis direction. The remaining layers are combined in multiple rows and columns in this way to achieve the effect of self-locking of adjacent structural parts in the combined thin-walled tube structure during the all-round impact process in space; The thin-walled tube substructure cross section is four long elliptical tubes of the same size connected in series by parallel thin plates at equal intervals, and the width H of the parallel thin plates and the width N of the main tube satisfy H=N; The length W and width N of the main tube of the thin-walled tube substructure satisfy W=3N; The fillet radius R of the thin-walled tube substructure and the width N of the main tube satisfy R=2N; The axial length L of the thin-walled tube substructure and the width N of the main tube satisfy L=N; In the XY axis plane, a plurality of series-connected thin-walled tube substructures are staggered in a one-in-one-out manner.

2. A spatial all-round self-locking series thin-walled tube energy absorption system according to claim 1, characterized in that: The front and rear staggered distance between the ends of two adjacent thin-walled tube substructures is the width of a parallel thin plate and the axial length of the main tube, that is, the staggered distance is H+L, and the spacing distance between two adjacent thin-walled tube substructures is the width N of the main tube. The thin-walled tube substructures along the Z-axis direction are stacked in two layers in a crisscross manner to form a group. Several groups of thin-walled tubes are stacked in a staggered manner to form a three-dimensional spatial structure, so that the combined structure can be quickly expanded in the three-dimensional direction without being limited by the size of the thin-walled tube substructure. The energy absorption system material is a metal thin-walled tube structure.

3. The spatial all-round self-locking series thin-walled tube energy absorption system according to claim 1 is characterized by: The number of series-connected thin-walled tube substructures extending in the XY-axis plane is not less than 2n, and n≥2, and the number of groups extending along the Z-axis is not less than 2.

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