A buckle type energy absorption column leg structure and a supporting system

Abstract

The application provides a buckle type energy absorption column leg structure and a supporting system, and belongs to the field of supporting column legs. The buckle type energy absorption column leg structure comprises a core layer upper shell, a core layer lower shell, a core layer outer socket, a core layer inner socket and a core layer core. When rock burst occurs, upper pressure first acts on the core layer upper shell, the core layer upper shell and the core layer lower shell are in contact at the contraction socket, work is done through the friction between the contact surfaces, plastic yield deformation of the material occurs, the first stage impact energy is preliminarily absorbed, and a first stage energy absorption link is formed. With the continuous impact, the upper conical frustum wall of the core layer core first bears the axial tensile load until the conical frustum structure is stretched to a flat circular shape, part of the energy is transmitted and dissipated; at the same time, the impact energy is transmitted to the lower part of the structure, the lower conical frustum further absorbs energy through plastic stretching and downward extrusion deformation, and the multi-cavity structure composed of the circular tube and the internal cross rib synchronously starts to collapse and dissipate energy.

Description

Technical Field

[0001] This invention relates to the field of support column legs, specifically to a snap-fit ​​type energy-absorbing column leg structure and support system. Background Technology

[0002] Existing coal mine roadways require support systems to resist surrounding rock pressure due to construction and safety requirements. Commonly used support materials and equipment in coal mine roadways include anchor bolts (cables), canopy supports, and hydraulic supports. Anti-rockburst support designs are often based on extensions and combinations of these support forms, focusing on improving the rigidity of the support structure. However, this approach can only meet the safety requirements of some coal mine roadways and cannot meet the safety requirements of all coal mine roadways. Therefore, some technical solutions for improving the column leg structure have been disclosed in the existing technology, but the existing improvement solutions are relatively complex in structure. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the purpose of this invention is to disclose a snap-fit ​​type energy-absorbing column leg structure and support system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention discloses a snap-fit ​​type energy-absorbing column leg structure, the energy-absorbing column leg structure comprising a support assembly; the support assembly comprising a core layer upper shell, a core layer lower shell, a core layer outer snap-fit, a core layer inner snap-fit, and a core layer core; the lower part of the core layer upper shell is the core layer inner snap-fit, and the upper part of the core layer lower shell is the core layer outer snap-fit; the shape of the core layer inner snap-fit ​​is the same as that of the core layer outer snap-fit, but the size is different; the core layer inner snap-fit ​​is precisely snapped into the core layer outer snap-fit; a core layer core is provided inside both the core layer upper shell and the core layer lower shell; the core layer core comprises an upper truncated cone, a circular tube, a cross rib, and a lower truncated cone; the upper truncated cone, the circular tube, and the cross rib are an integral structure; the circular tube is located at the lower part of the upper truncated cone, and a cross rib is provided inside the circular tube, and the circular tube is inserted into the lower truncated cone.

[0005] As a further technical solution, the core layer inner bayonet and the core layer outer bayonet are both double cone shapes with a small middle radius and large radii at both ends.

[0006] As a further technical solution, the inclination of the two cones of the inner core bayonet and the outer core bayonet is the same.

[0007] As a further technical solution, the inclinations of the two cones in the inner core bayonet and the outer core bayonet are different.

[0008] As a further technical solution, the support components include multiple components, and the tops of the multiple support components are connected to the same cover plate.

[0009] As a further technical solution, the diameter of the circular tube is slightly smaller than the minimum diameter of the lower truncated cone, but equal to the minimum diameter of the upper truncated cone; the height of the circular tube is equal to the height of the lower truncated cone.

[0010] As a further technical solution, the bottom of the inner core layer bayonet is closed; the top of the outer core layer bayonet is open.

[0011] As a further technical solution, the top and bottom of the core layer shell are closed to form a closed space, and the core layer core is placed in the closed space.

[0012] As a further technical solution, the core layer lower shell is open at the top and closed at the bottom.

[0013] Secondly, the present invention provides a support system, including the aforementioned snap-fit ​​energy-absorbing column leg structure.

[0014] The beneficial effects of this invention are as follows: When the snap-fit ​​energy-absorbing column leg structure is subjected to an impact force from above, the upper truncated cone wall of the core layer, located inside the upper shell of the core layer, first bears the axial tensile load and is gradually stretched into a flat circle. Subsequently, the impact energy is transferred to the lower part, where it is further dissipated through the plastic tension and downward extrusion deformation of the lower truncated cone wall. At the same time, the multi-cavity structure composed of the metal tube and the internal cross ribs simultaneously initiates the collapse process, and the tube undergoes irreversible plastic buckling deformation. Meanwhile, the internal cross ribs effectively suppress the overall instability of the tube while assisting in energy absorption through bending or shearing, ensuring the orderliness of the buckling deformation. As the impact continues, it gradually transfers to the core layer inside the lower shell. The upper truncated cone wall of the core layer first bears the axial tensile load and is gradually stretched into a flattened circle. Then the impact energy is transferred to the lower part, where it is further dissipated through the plastic tension and downward extrusion deformation of the lower truncated cone wall. At the same time, the multi-cavity structure composed of the metal tube and the internal cross ribs simultaneously initiates the collapse process. The tube undergoes irreversible plastic buckling deformation, while the internal cross ribs effectively suppress the overall instability of the tube and ensure the orderliness of the buckling deformation while absorbing energy through bending or shearing. Furthermore, as the impact continues, energy is absorbed in the second stage through the frictional force between the inner and outer double-cone contact surfaces of the core layer and the plastic buckling deformation of the material. Ultimately, this multi-level layering mechanism achieves efficient dissipation of impact energy and improves the structure's resistance to ground pressure.

[0015] Therefore, the present invention can realize the absorption of impact energy by the anti-impact support under any working condition, improve the energy absorption level, greatly improve the safety of roadway support, and the overall structure is simple and practical. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the snap-fit ​​type energy-absorbing column leg structure disclosed in Embodiment 1 of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the snap-fit ​​type energy-absorbing column leg structure disclosed in Embodiment 1 of the present invention. Figure 2 ; Figure 3 This is a cross-sectional schematic diagram of the support component disclosed in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the core structure disclosed in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the core layer upper shell structure disclosed in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the core layer lower shell structure disclosed in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the core structure disclosed in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the support system disclosed in Embodiment 2 of the present invention; The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0018] 1. Cover plate; 2. Column leg housing; 3. Support components; 31. Core layer upper shell; 32. Core layer lower shell; 33. Core layer outer bayonet; 34. Core layer inner bayonet; 4. Core layer; 41. Upper truncated cone; 42. Circular tube; 43. Cross rib; 44. Lower truncated cone; 5. Support frame; Detailed Implementation It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves. They do not limit the structure and are merely for the purpose of facilitating the description of this invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] As described in the background section, the existing technology has shortcomings. To address the above-mentioned technical problems, this invention proposes a snap-fit ​​energy-absorbing column leg structure and a support system including the snap-fit ​​energy-absorbing column leg structure. The snap-fit ​​energy-absorbing column leg structure includes a support assembly. The support assembly includes a core layer upper shell, a core layer lower shell, a core layer outer snap-fit, a core layer inner snap-fit, and a core layer core. The lower part of the core layer upper shell is the core layer inner snap-fit, and the upper part of the core layer lower shell is the core layer outer snap-fit. The shape of the core layer inner snap-fit ​​is the same as that of the core layer outer snap-fit, but the size is different, and the core layer inner snap-fit ​​fits precisely into the core layer outer snap-fit. The upper and lower core shells each contain a core layer. The core layer core includes an upper truncated cone, a circular tube, a cross rib, and a lower truncated cone. The upper truncated cone, circular tube, and cross rib are an integral structure. The circular tube is located at the lower part of the upper truncated cone, and a cross rib is located inside the circular tube. The circular tube is inserted into the lower truncated cone. When an impact pressure occurs, the upper pressure first acts on the upper core shell. At the contraction joint where the upper and lower core shells contact, the friction between the contact surfaces does work, and the material undergoes plastic yielding deformation, thus achieving the initial absorption of the first stage of impact energy, forming a primary energy absorption stage.

[0021] As the impact continues, the upper frustum wall of the core layer first bears the axial tensile load until the frustum structure is stretched into a flat circular shape, completing part of the energy transfer and dissipation; at the same time, the impact energy is transferred to the lower part of the structure, and the lower frustum further absorbs energy through plastic tension and downward extrusion deformation, and the multi-cavity structure composed of the circular tube and the internal cross ribs simultaneously starts to collapse and dissipate energy.

[0022] Example 1 In a typical embodiment of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, this embodiment provides a snap-fit ​​type energy-absorbing column leg structure, which mainly includes a support component 3; as Figure 3 As shown, the support assembly 3 includes a core layer upper shell 31, a core layer lower shell 32, a core layer outer bayonet 33, a core layer inner bayonet 34, and a core layer core 4; the core layer outer bayonet 33 and the core layer inner bayonet 34 form a primary energy absorption.

[0023] like Figure 5 As shown, the core shell 31 is a structure that is closed at the top and closed at the bottom; a core core 4 is provided inside the core shell 31, the core core 4 is located in the closed cavity, and the bottom of the core shell 31 is connected to the core inner bayonet 34; the core inner bayonet 34 is integrally formed with the core shell 31.

[0024] like Figure 6 As shown, the core layer lower shell 32 is a structure with an open top and a closed bottom; a core layer core 4 is set inside the core layer lower shell 32; the upper part of the core layer lower shell 32 is the core layer outer snap 33; the core layer outer snap 33 is integrally formed with the core layer lower shell 32.

[0025] Furthermore, the shape of the inner core layer slot 34 is the same as that of the outer core layer slot 33, but the size is different; the inner core layer slot 34 is precisely fitted into the outer core layer slot 33; when the impact pressure occurs, the upper pressure first acts on the upper core layer shell 31, and at the contraction slot where the upper core layer shell 31 and the lower core layer shell 32 contact, the friction between the contact surfaces does work and the material undergoes plastic yield deformation, thus achieving the initial absorption of the first stage of impact energy, forming a first-level energy absorption link.

[0026] like Figure 4 , Figure 7As shown, the core layer 4 includes an upper truncated cone 41, a circular tube 42, a cross rib 43, and a lower truncated cone 44; both the upper truncated cone 41 and the lower truncated cone 44 are open at the top and bottom; the upper truncated cone 41, the circular tube 42, and the cross rib 43 are an integral structure; the circular tube 42 is located at the lower part of the upper truncated cone 41, and the cross rib 43 is provided inside the circular tube 42, and the circular tube 42 is inserted into the lower truncated cone 44; the upper and lower core layers 4 inside the upper shell 31 and the lower shell 32 of the core layer form a secondary energy absorption; as the impact continues, the upper truncated cone wall inside the upper shell 31 and the lower shell 32 of the core layer first bears the axial tensile load until the truncated cone structure is stretched into a flat circular shape, completing part of the energy transfer and dissipation; at the same time, the impact energy is transferred to the lower part of the structure, and the lower metal truncated cone 44 further absorbs energy through the plastic stretching of its truncated cone wall and the downward extrusion deformation, and the multi-cavity structure composed of the metal circular tube 42 and the internal cross rib synchronously starts to collapse and dissipate energy. Under impact pressure, the metal circular tube 42 undergoes plastic buckling deformation, dissipating energy through irreversible structural changes. The internal cross ribs 43 not only effectively suppress overall instability during the collapse of the metal circular tube, ensuring the orderly buckling deformation, but also assist in energy absorption through their own bending or shear deformation. Ultimately, this achieves graded and efficient dissipation of impact energy, improving the structure's resistance to rock bursts. Therefore, this invention can achieve impact energy absorption by the anti-impact support under any working condition, improving the energy absorption level and greatly enhancing the safety of roadway support.

[0027] Furthermore, the top and bottom of the aforementioned upper truncated cone 41 can be designed as open or closed structures.

[0028] Furthermore, the top of the lower truncated cone 44 is open, and the bottom can be designed as either open or closed.

[0029] Furthermore, the support component 3 is made of Q235 steel.

[0030] Furthermore, both the inner core bayonet 34 and the outer core bayonet 33 are double-cone shapes with a smaller radius in the middle and larger radii at both ends. The slopes of the two cones can be designed to be the same or different. In this embodiment, the slopes of the two cones are the same, with an initial value of 60°, but the initial value ranges from 50° to 70°. The inner core bayonet fits perfectly into the outer core bayonet. When an impact occurs, the contact surfaces of the inner and outer bayonets will initially absorb the impact energy through friction and mutual compression. Under continuous impact, both the upper and lower cones of the double-cone structure will be stretched from a cone shape to a flat circular shape. This process can dissipate a large amount of energy, making the structure simple and efficient.

[0031] Furthermore, the lower core shell 32 and the upper core shell 31 have the same height; the initial height of the lower core shell 32 is 160 mm, with a range of 140-180 mm. Similarly, the initial height of the upper core shell 31 is 160 mm, with a range of 140-180 mm.

[0032] Furthermore, the lamp cap-type tensile extrusion energy-absorbing structure is made of Q235 steel. The initial slope of the truncated cone 41 is 70°, ranging from 60° to 80°, and the initial height is 140 mm, ranging from 120 to 160 mm.

[0033] Furthermore, the diameter of the lower base of the upper truncated cone 41 is equal to the diameter of the circular tube 42, with an initial value of 170 mm and a range of 150-190 mm.

[0034] Furthermore, the initial height of the circular tube 42 is 180 mm, with a range of 150-200 mm.

[0035] Furthermore, the initial value of the diameter of the upper base of the lower truncated cone 44 is 174 mm, with a range of 154-194 mm. The initial value of the diameter of the upper base of the lower truncated cone 44 should be such that the lower truncated cone 44 can just fit the round tube 42. The initial value of the height is 180 mm, with a range of 150-200 mm.

[0036] Furthermore, in this embodiment, the initial height of the cross rib 43 is 180 mm, and the range is 150-200 mm.

[0037] Furthermore, the initial wall thickness of each part of the structure is 8 mm, with a range of 6-10 mm.

[0038] Furthermore, in order to form an energy-absorbing column leg structure and achieve connection with the support frame, this embodiment also includes a cover plate 1 and a column leg shell 2; the support component 3 is an integral structure, and multiple support components 3 are provided. The support components 3 are arranged vertically inside the column leg shell 2. The multiple support components 3 are arranged side by side, with their tops connected to the cover plate 1 and their bottoms connected to the inner bottom surface of the column leg shell 2; in this embodiment, four support components 3 are provided, and the four support components 3 are arranged side by side inside the column leg shell 2. The cover plate 1, the column leg shell 2, and the support components 3 are connected to form a whole, which is connected to the support frame.

[0039] Based on the snap-fit ​​energy-absorbing column leg structure proposed above, the overall energy absorption principle of this invention is as follows: When the snap-fit ​​energy-absorbing column leg structure is subjected to an impact force from above, the upper truncated cone wall of the core layer, located inside the upper shell of the core layer, first bears the axial tensile load and is gradually stretched into a flat circle. Subsequently, the impact energy is transferred to the lower part, where it is further dissipated through the plastic tension and downward extrusion deformation of the lower truncated cone wall. At the same time, the multi-cavity structure composed of the metal tube and the internal cross ribs simultaneously initiates the collapse process, and the tube undergoes irreversible plastic buckling deformation. Meanwhile, the internal cross ribs effectively suppress the overall instability of the tube while assisting in energy absorption through bending or shearing, ensuring the orderliness of the buckling deformation. As the impact continues, it gradually transfers to the core layer inside the lower shell. The upper truncated cone wall of the core layer first bears the axial tensile load and is gradually stretched into a flattened circle. Then the impact energy is transferred to the lower part, where it is further dissipated through the plastic tension and downward extrusion deformation of the lower truncated cone wall. At the same time, the multi-cavity structure composed of the metal tube and the internal cross ribs simultaneously initiates the collapse process. The tube undergoes irreversible plastic buckling deformation, while the internal cross ribs effectively suppress the overall instability of the tube and ensure the orderliness of the buckling deformation while absorbing energy through bending or shearing. Furthermore, as the impact continues, energy is absorbed in the second stage through the frictional force between the inner and outer double-cone contact surfaces of the core layer and the plastic buckling deformation of the material. Ultimately, this multi-level layering mechanism achieves efficient dissipation of impact energy and improves the structure's resistance to ground pressure.

[0040] Example 2 like Figure 8 As shown, this embodiment also provides a support system, which includes the snap-fit ​​energy-absorbing column leg structure disclosed in Embodiment 1; the snap-fit ​​energy-absorbing column leg structure is connected to the bottom of the support bracket 5 and can be used for support systems such as roadways and surrounding rock; since the support system is equipped with the snap-fit ​​energy-absorbing column leg structure as described above, the support system also has all the advantages described above.

[0041] Example 3 The support component 3 in Example 1 can also be used in scenarios subject to bidirectional impact, such as automotive energy-absorbing struts, horizontal bracing systems for ultra-deep urban foundation pits, and long, deep tunnels. When used in bidirectional impact scenarios, the specific energy dissipation process is as follows: The pressure is initially borne by the upper and lower shells of the core layer, causing intense friction and plastic yielding deformation of the inner and outer double-cone contact surfaces of the core layer at the intermediate connection point under bidirectional compression, rapidly absorbing the initial kinetic energy. As the impact continues, the upper truncated cone walls of the upper and lower core layers simultaneously bear axial tensile loads and evolve into a flattened circular shape, while the lower truncated cone further reduces residual energy through plastic tension and inward compression deformation. Finally, the multi-cavity structure composed of the metal circular tubes at both ends of the structure and the internal cross ribs collapses simultaneously under bidirectional pressure. The circular tubes undergo plastic buckling deformation, while the cross ribs, while absorbing energy through bending or shearing, effectively suppress the overall instability of the circular tubes under bidirectional high pressure, ensuring the overall stability of the support system in complex dynamic environments.

[0042] Finally, it should be noted that relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A snap-fit ​​type energy-absorbing column leg structure, characterized in that, The system includes a support assembly; the support assembly includes a core layer upper shell, a core layer lower shell, a core layer outer bayonet, a core layer inner bayonet, and a core layer core; the lower part of the core layer upper shell is the core layer inner bayonet, and the upper part of the core layer lower shell is the core layer outer bayonet; the shape of the core layer inner bayonet and the core layer outer bayonet are both double cone shapes with a small radius in the middle and a large radius at both ends. The core layer inner bayonet fits perfectly into the core layer outer bayonet. At the contraction bayonet point where the core layer inner bayonet and the core layer outer bayonet contact, work is done through the friction between the contact surfaces; each of the core layer upper shell and the core layer lower shell is provided with a core layer core, and the upper and lower core layer cores in the core layer upper shell and the core layer lower shell form a two-stage energy absorption; the core layer core includes an upper truncated cone, a circular tube, a cross rib, and a lower truncated cone; the upper truncated cone, the circular tube, and the cross rib are an integral structure, the circular tube is located at the lower part of the upper truncated cone, the cross rib is provided inside the circular tube, and the circular tube is inserted into the lower truncated cone; The diameter of the circular tube is slightly smaller than the minimum diameter of the lower truncated cone and equal to the minimum diameter of the upper truncated cone; the height of the circular tube is equal to the height of the lower truncated cone; the bottom of the inner bayonet of the core layer is closed, and the top of the outer bayonet of the core layer is open; the top and bottom of the upper shell of the core layer are closed, forming a closed space, and the core layer core is placed in the closed space.

2. The snap-fit ​​type energy-absorbing column leg structure as described in claim 1, characterized in that, The two cones of the inner core layer bayonet and the outer core layer bayonet have the same inclination.

3. The snap-fit ​​type energy-absorbing column leg structure as described in claim 1, characterized in that, The inclinations of the two cones in the inner core bayonet and the outer core bayonet are different.

4. The snap-fit ​​type energy-absorbing column leg structure as described in claim 1, characterized in that, The support assembly comprises multiple components, and the tops of the multiple support assemblies are connected to the same cover plate.

5. The snap-fit ​​type energy-absorbing column leg structure as described in claim 1, characterized in that, The core layer lower shell has an open top and a closed bottom.

6. A support system, characterized in that, Includes the snap-fit ​​energy-absorbing column leg structure as described in any one of claims 1-5.

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