A self-centering steel plate column connector and a combined structure thereof

Abstract

The patent relates to a column and plate connecting piece, in particular to a waist-retracted columnar steel plate connecting piece and a combined structure thereof, which comprises a columnar body (1) and a bottom plate (3). The connecting end (12) is arranged at the end of the columnar body (1), the connecting end (12) is connected with the bottom plate (3) through friction welding, the longitudinal section of the outer wall (11) of the columnar body (1) is a curve, and the pipe body diameter at the two ends of the columnar body (1) is larger than the pipe body diameter at the middle part. The columnar body (1) and the bottom plate (3) of the patent adopt the friction welding process with high industrial production degree. Compared with general fusion welding, the friction welding has the advantages of stable performance, high structural strength, low defective rate, few welding defects and the like.

Description

Technical Field

[0001] This patent relates to column and plate connectors, and more particularly to a waist-shaped columnar steel plate connector and its combined structure. Background Technology

[0002] Traditional columnar steel plate connectors typically use straight or cylindrical tubes as the columnar body, which are connected to the steel plate via conventional welding. This welding method is inefficient and involves many uncontrollable factors. For example, due to the circumferential welding path, the welding parts are not welded simultaneously, resulting in deformation of the welded structure due to differences in temperature during welding. Furthermore, the weld slag produced during ordinary welding can easily affect the structure. Summary of the Invention

[0003] This patent addresses the poor structural stability of existing columnar steel plate connectors by providing a synchronous friction welding connection and a waist-shaped columnar steel plate connector and its combined structure.

[0004] To solve the above-mentioned technical problems, this patent provides the following technical solution:

[0005] A waist-reducing columnar steel plate connector includes a columnar body and a base plate. A connecting end is provided at each end of the columnar body, and the connecting end is connected to the base plate by friction welding. The longitudinal section of the outer wall of the columnar body is curved, and the diameter of the tubes at both ends of the columnar body is larger than the diameter of the tube in the middle. The diameter of the middle part of the columnar body is slightly smaller than the diameters at both ends, forming a micro-conical flared tube or column towards the two ends. This causes inward compressive stress to form from the welded part to the first buckling half-wave, which partially offsets and balances the outward deformation of the elephant foot or the tensile stress of the first outward buckling half-wave, thus delaying or inhibiting the generation of the first buckling half-wave. The reduction in the diameter of the middle part of the columnar body is less than 1T, where T is the wall thickness of the columnar body. This design achieves the waist-reducing effect of this application without exceeding the center of the wall thickness to avoid the adverse effect of additional bending moments. This is a preferred coupling design.

[0006] Preferably, the columnar body and the connecting end are made of the same material.

[0007] Preferably, the wall thickness of the connecting end gradually decreases from the middle of the columnar body to the connecting end in the axial direction. This application's connecting end features a gradually decreasing wall thickness structure, which is beneficial during friction welding. When the connecting end is embedded in the steel plate matrix, it forms a weld interface with compressive stress, which balances or essentially cancels out the tensile stress caused by the cooling and shrinkage after friction welding. This reduces the fundamental factor of tensile stress fatigue at the weld end. Simultaneously, the tapered shape with gradually decreasing wall thickness makes it easier to embed into the steel plate matrix, forming a tubular mechanical embedding force. This results in the welded connection and mechanical embedding jointly bearing the connection and shear resistance, significantly improving the connection capacity. The connecting end is machined from the end of the columnar body, and the wall thickness structure of the connecting end, which is thinner at first and thicker at the end, prevents the initial current when the friction welding equipment starts from being too high. When the rotational speed reaches or approaches the baseline process requirements, the thinner part has already largely melted and extruded, which is beneficial to the machine's lifespan and industrial manufacturing.

[0008] Preferably, the cylindrical body is a hollow tube with open ends. Compared to a solid tube, a hollow tube uses less material. Furthermore, because the cylindrical body is connected to the top and bottom plates via friction welding, the linear velocity of its outer edge is the highest, resulting in the best friction welding effect. In contrast, with a solid cylinder, the central portion has a lower linear velocity at the same rotational speed, consuming more energy during actual rotational friction welding and resulting in a poorer welding effect.

[0009] Preferably, one end of the cylindrical body is provided with a connecting clamping end. When the connecting end of this application employs an external rotation friction welding process, the outer side of the connecting end has a connecting clamping end for friction welding rotation. The connecting clamping end has a regular polygonal anti-torsional rotation structure and is embedded and rotated with the power mechanism of the friction welding during manufacturing. The cylindrical body and clamping end of the above structure are integrally stamped, reducing the number of parts and the probability of connection defects, and improving the stability of the connection point. When the connecting end employs an internal rotation friction welding process, its shoulder is prepared by stamping or machining a tubular connector to meet the requirements of molten material extrusion and deposition during the connection.

[0010] Preferably, the connecting clamping end and the columnar body are made of the same material. This application adopts a reinforced structure with closely packed and thin-walled columnar bodies, rather than the traditional sparse arrangement, which ensures both the overall performance of the metal small cavity multi-directional plate structure and the local stiffness of the plate surface. The local stiffness of the plate surface is mainly reflected by the distance-to-thickness ratio, that is, the ratio of the surface and bottom thickness to the support spacing. In this application, the maximum spacing in the plate surface spacing unit does not exceed 1.2 times the diameter of the columnar body, forming a homogeneous and balanced reasonable structure for the plate surface support layout.

[0011] Preferably, the connecting clamping end includes a conical boss and a fastening end. One end of the conical boss is connected to the fastening end, and the other end is connected to the columnar body. A point load can be transmitted to the entire columnar body or shell and all components, forming a multi-directional plate force transmission structure that rapidly radiates outwards. The top or bottom plate is subjected to force transmission from the columnar body distributed along three axial directions, forming a multi-dimensional tensioned double-film effect on the top and bottom plates. Loads that have a significant impact on the structure are often sudden dynamic loads or alternating loads. In the rapid multi-directional force transmission mode of the structure in this application, the load has the characteristic of early transmission, causing the stress value to rise earlier and fall and end later. This significantly reduces the slope of the maximum and minimum peak values ​​of the stress amplitude, increasing the action time and making the stress value increase and decrease more gradual. This has a better buffering effect on the destructive force of each connection point structure and has a beneficial effect on component cracking and fatigue.

[0012] Preferably, the fastening end is a convex cap or a concave cap. The convex cap can serve as a connection structure outside the roof slab, or as an additional hook, as well as an anchoring function for the external pavement layer; the concave cap structure is a structure in which the rotating fastening end is basically flush with the roof slab to ensure flushness and consistency with the external structure.

[0013] A waist-shaped columnar composite structure includes the aforementioned waist-shaped columnar steel plate connectors and a top plate. The columnar body is disposed between the bottom plate and the top plate, and the columnar body is connected to the bottom plate and the top plate by synchronous friction welding. Internal welding of hollow plates, especially narrow hollow plates, has always been a bottleneck problem in the industry. Welding both ends of a component within a confined space requires ensuring stable welding processes and identical or similar parameters at both ends, which is even more challenging.

[0014] Preferably, the top plate has a connecting hole, and the side of the columnar body with the connecting clamping end passes through the connecting hole and is connected to the top plate by friction welding. The superimposed thickness of the opening is greater than the thickness of the top plate.

[0015] To ensure the connection performance of the aforementioned connectors, this patent employs a friction welding process that is stable and highly industrialized. Compared to conventional fusion welding, friction welding has the advantages of a lower defect rate and fewer welding defects. Furthermore, this application provides a tapered shoulder at the connection end of the tube body. During friction welding with the top plate, the molten material is extruded and fills the shoulder, further accumulating on the outside to form a larger reinforcing ring. This effectively increases the diameter of the columnar body, generating an inward additional force that further balances the stress of the columnar body's outward bulging, making buckling of the columnar body more difficult and thus improving the stability of the connection structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this patent.

[0017] Figure 2 This is a schematic diagram of the columnar body in Embodiment 1 of this patent.

[0018] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this patent.

[0019] Figure 4 This is a schematic diagram of the waist-cinching columnar composite structure in Embodiment 1 of this patent.

[0020] Figure 5 This is a schematic diagram of the waist-cinching columnar composite structure in Embodiment 2 of this patent.

[0021] Figure 6 for Figure 5 Overall schematic diagram.

[0022] Figure 7 This is a schematic diagram of a columnar body structure with an outwardly protruding cap.

[0023] Wherein 1—columnar body, 2—connecting clamping end, 3—bottom plate, 4—top plate, 11—outer wall, 12—connecting end, 21—conical boss, 22—fastening end, 23—outer protruding bolt cap, 41—connecting hole. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 The present patent will be further described in detail with reference to specific embodiments: Example 1

[0025] A type of waist-cinching columnar steel plate connector, such as Figure 1 , 2 As shown in Figure 4, the structure includes a columnar body 1 and a base plate 3. A connecting end 12 is provided at the end of the columnar body 1, and the connecting end 12 is connected to the base plate 3 by friction welding. The longitudinal section of the outer wall 11 of the columnar body 1 is curved, and the diameter of the tube at both ends of the columnar body 1 is larger than the diameter of the tube in the middle. The diameter of the middle part of the columnar body 1 is slightly smaller than the diameter at both ends, forming a micro-conical flared tube or column towards the two ends. This causes the welded part to form an inward compressive stress from the first buckling half-wave, which partially offsets and balances the outward deformation of the elephant foot or the tensile stress of the first outward buckling half-wave. This delays or inhibits the generation of the first buckling half-wave, and controls the amount of diameter reduction to be less than 1T. This achieves the effect of waist reduction in this application without generating a value beyond the center of the wall thickness to avoid the adverse effect of additional bending moment. This is a better coupling design.

[0026] When the columnar connector or columnar body 1 is a hollow tube, it often exhibits outward bulging during operation. Once the first buckling bulge forms, multiple buckling bulges will continuously form under subsequent continuous loading. The common practice is to thicken the columnar body 1 or add reinforcing ribs. However, these methods increase material usage and workload. This application takes a different approach: the diameter of the tube at both ends of the columnar body 1 is larger than the diameter at the middle. That is, the columnar body 1 adopts a pre-buckling method, being narrower in the middle and wider at both ends. This balances the outward bulging stress during operation of the hollow columnar tube, delays the buckling time, and improves structural performance.

[0027] The columnar body 1 and the connecting end 12 are made of the same material, which has the advantages of higher manufacturing efficiency and more stable structure. From the middle of the columnar body 1 to the connecting end 12 in the axial direction, the wall thickness of the connecting end 12 gradually decreases. The gradually decreasing wall thickness structure of the connecting end 12 in this application is beneficial because during friction welding, when the connecting end 12 is embedded in the steel plate matrix, the compressive stress weld interface is formed, which balances or essentially cancels out the tensile stress caused by the cooling and shrinkage after friction welding. This reduces the basic factors of tensile stress fatigue in the welding end 12. Simultaneously, the tapered shape with gradually decreasing wall thickness makes it easier to embed into the steel plate matrix, forming a tubular mechanical embedding force. This results in the welded connection and mechanical embedding jointly bearing the connection and shear resistance, significantly improving the connection capacity. Furthermore, the wall thickness structure, with thinner walls initially followed by thicker walls, prevents the initial current of the friction welding equipment from being too high. When the rotational speed reaches or approaches the baseline process requirements, the thinner portion has already largely melted and extruded, which is beneficial to the machine's lifespan and industrial manufacturing.

[0028] The columnar body 1 is a hollow tube with both ends open. The waist-shaped connector of this application is used to connect the top plate 4 and the bottom plate 3 arranged vertically. The waist-shaped connector is held between the top plate 4 and the bottom plate 3 by an internal extension device and rotated, while pressure is applied to the top plate 4 and the bottom plate. The external gripping and rotating mechanism rubs and rotates the waist-shaped connector one by one. After the waist-shaped connector is frictionally welded to the top plate 4 and the bottom plate, the external gripping and rotating mechanism releases the gripping mechanism and exits in sequence to perform the next welding work, forming an integral hollow plate of the top plate 4 and the bottom plate without the need for openings. It has strong integrity and low fatigue factor.

[0029] A waist-shaped columnar composite structure includes the aforementioned waist-shaped columnar steel plate connectors, and also includes a top plate 4. The columnar body 1 is disposed between the bottom plate 3 and the top plate 4, and the columnar body 1 is connected to the bottom plate 3 and the top plate 4 by synchronous friction welding. Internal welding of hollow plates, especially internal welding of narrow hollow plates, has always been a bottleneck problem in the industry. Welding both ends of a component within a confined space, ensuring stable welding processes and identical or similar parameters at both ends, is even more challenging.

[0030] Example 2

[0031] like Figure 3 , 5 As shown in Figure 6, in this embodiment, one end of the columnar body 1 is provided with a connecting clamping end 2. When the connecting end 12 in this embodiment adopts the external rotation friction welding process, the connecting end 12 has a connecting clamping end 2 on its outer side for friction welding rotation. The connecting clamping end 2 is a regular polygonal anti-torsional rotation structure, which is embedded and rotated with the power mechanism of the friction welding during manufacturing. The columnar body 1 and the clamping end 2 are integrally stamped, reducing the number of parts and the probability of connection defects, and improving the stability of the connection point. When the connecting end 12 adopts the internal rotation friction welding process, its shoulder is prepared by stamping or machining a tubular connector to meet the needs of molten material extrusion and deposition during connection.

[0032] In this embodiment, a connecting clamping end 2 is provided at one end of the columnar body 1. The connecting clamping end 2 is located outside the top plate 4 and can be connected to the rotating end of the friction welding mechanism. At the lower part of the connecting clamping end 2, a conical boss 21 is provided that matches the opening of the top plate 4. The far end of the columnar body 1 contacts the bottom plate, forming a clever structure in which the rotating mechanism and the bottom plate are welded simultaneously.

[0033] During friction rotary welding, the upsetting pressure of friction welding first acts on the top plate 4. The top plate 4 is applied to the columnar body 1 through the conical boss 21. The columnar body 1 transmits the force to its far end, pressing against the farthest bottom plate 3. In the above force transmission path, action and reaction forces are transmitted, making the initial upsetting force of the top plate 4, the friction welding upsetting force of the top plate 4 and the conical boss 21, and the upsetting force of the far end of the columnar body 1 and the bottom plate all the same. The rotary friction mechanism is in a coaxial rotating state with the same speed. The rotary friction mechanism and the columnar body 1 start and stop synchronously. In this way, a welding process with the same upsetting force, speed, and time at both welding ends is formed, making the manufacturing of the cavity plate with external rotation and internal welding a reality. Moreover, its upsetting force, time, and speed can be synchronously detected by an external mechanism and are controllable, achieving the effect of stable performance of the cavity plate.

[0034] The clamping end 2 and the columnar body 1 are made of the same material. This embodiment adopts a reinforced structure of densely packed and thin-walled columnar body 1, rather than the traditional sparse arrangement. This ensures both the overall performance of the metal small cavity multi-directional plate structure and the local stiffness of the plate surface. The local stiffness of the plate surface is mainly reflected by the distance-to-thickness ratio, that is, the ratio of the surface and bottom thickness to the support spacing. In this application, the maximum spacing in the plate surface spacing unit does not exceed 1.2 times the diameter of the columnar body 1, forming a homogeneous and balanced reasonable structure for the plate surface support layout.

[0035] The connecting clamping end 2 includes a conical boss 21 and a fastening end 22. One end of the conical boss 21 is connected to the fastening end 22, and the other end of the conical boss 21 is connected to the columnar body 1. A point load can be transmitted to all columnar bodies 1 or the shell and all components, forming a multi-directional plate force transmission structure that rapidly radiates outwards. The top plate 4 or bottom plate 3 is subjected to force transmission from the uniformly distributed columnar bodies 1 along three axial directions, forming a multi-dimensional tensioned double-film effect on the top and bottom plates. Loads that have a significant impact on the structure are often sudden dynamic loads or alternating loads. In the rapid multi-directional force transmission mode of the structure in this application, the load has the characteristic of early transmission, causing the stress value to rise earlier and fall and end later. In this way, the slope of the maximum and minimum peak values ​​of the stress amplitude is significantly reduced, which increases the action time and makes the stress value increase and decrease more gradually. This has a better buffering effect on the destructive force of each connection point structure and has a beneficial effect on component cracking and fatigue.

[0036] In this embodiment, the waist-shaped columnar composite structure has a connecting hole 41 on the top plate 4. The columnar body 1, with the connecting clamping end 2 on one side, passes through the connecting hole 41 and is connected to the top plate 4 by friction welding. The thickness of the opening portion of the connecting hole 41 is greater than the thickness of the top plate. Therefore, the structural strength of the connecting hole 41 portion is much greater than that of other unopened portions, making it less prone to defects compared to other portions, thus making the entire structure more stable.

[0037] Example 3

[0038] like Figure 7 As shown, in this embodiment, the fastening end is either a convex cap 23 or a concave cap 22. The convex cap 23 can serve as a connection structure outside the top plate 4, or as an additional hook or anchoring function for the external paving layer; the concave cap 22 is a structure in which the rotating fastening end is basically flush with the top plate 4 to ensure flushness and consistency with the external structure.

[0039] In summary, the above description is only a preferred embodiment of this patent. All equivalent changes and modifications made within the scope of this patent application should be covered by this patent.

Claims

1. A waist-shaped columnar steel plate connector, comprising a columnar body (1) and a base plate (3), characterized in that: The connecting end (12) is provided at the end of the columnar body (1). The connecting end (12) is connected to the base plate (3) by friction welding. The longitudinal section of the outer wall (11) of the columnar body (1) is curved. The diameter of the tube at both ends of the columnar body (1) is greater than the diameter of the tube in the middle. The amount of reduction in diameter in the middle of the columnar body (1) is less than the wall thickness T of the columnar body.

2. The waist-cinching columnar steel plate connector according to claim 1, characterized in that: The columnar body (1) and the connecting end (12) are made of the same material.

3. The waist-cinching columnar steel plate connector according to claim 1, characterized in that: Along the axial direction from the middle of the columnar body (1) to the connecting end (12), the wall thickness of the connecting end (12) gradually decreases.

4. The waist-cinching columnar steel plate connector according to claim 1, characterized in that: The columnar body (1) is a hollow tube with both ends open.

5. The waist-cinching columnar steel plate connector according to claim 1, characterized in that: One end of the columnar body (1) is provided with a connecting clamping end (2).

6. The waist-cinching columnar steel plate connector according to claim 5, characterized in that: The connecting clamping end (2) and the columnar body (1) are made of the same material.

7. A waist-cinching columnar steel plate connector according to claim 5, characterized in that: The connecting clamping end (2) includes a conical boss (21) and a fastening end (22). One end of the conical boss (21) is connected to the fastening end (22), and the other end of the conical boss (21) is connected to the columnar body (1).

8. A waist-cinching columnar steel plate connector according to claim 7, characterized in that: The fastening end (22) is a convex cap (23) or a concave cap (22).

9. A waist-cinching columnar composite structure, comprising the waist-cinching columnar steel plate connector as described in any one of claims 1-8, characterized in that: It also includes a top plate (4), and a columnar body (1) is set between the bottom plate (3) and the top plate (4). The columnar body (1) is connected to the bottom plate (3) and the top plate (4) by synchronous friction welding.

10. A waist-cinching columnar composite structure according to claim 9, characterized in that: The top plate (4) is provided with a connecting hole (41), and the columnar body (1) with a connecting clamping end (2) on one side passes through the connecting hole (41) and is connected to the top plate (4) by friction welding.

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