Self-adaptive centering mechanism for air conditioner pipeline welding

Abstract

The invention relates to the technical field of air conditioner pipeline welding clamping, in particular to a self-adaptive centering mechanism for air conditioner pipeline welding, and first-time accurate calibration and clamping are completed through a first set of inlet centering plates under the action of torsional springs. Then, the pipeline is pushed to a channel outlet, secondary calibration is conducted through a second set of outlet centering plates, a crucial geometric foundation is laid for obtaining high-quality welding seams, the pre-compression amount of a bearing spring can be changed in advance, and therefore the equivalent stiffness and stroke of the whole supporting system are actively adjusted; due to the design of combining material presetting and diameter self-adaption, a single mechanism can be widely adapted to pipelines with different physical property parameters, materials, weights and diameters, and the universality is extremely high; a first sliding ball capable of freely rotating is mounted on the bearing arc plate, so that axial fine adjustment and rotation of the pipeline after preliminary placement are facilitated; and a second sliding ball is also embedded in the edge of the tail part of the centering plate for finally clamping the pipeline, so that the pipeline can be conveniently and accurately rotated and positioned in the circumferential direction before being welded.

Description

Technical Field

[0001] This invention relates to the field of air conditioning pipe welding clamping technology, and in particular to an adaptive centering mechanism for air conditioning pipe welding. Background Technology

[0002] In the installation and manufacturing of HVAC, refrigeration equipment, and industrial piping systems, welding of air conditioning pipes is a crucial process for ensuring the system's sealing, strength, and reliability. Welding quality, especially the quality of butt welds, directly determines whether the piping system can withstand the design pressure and whether media leakage will occur. A fundamental prerequisite for obtaining high-quality circumferential welds is ensuring a high degree of coaxial alignment of the ends of the two pipes to be connected before welding. Any slight axial misalignment or edge deviation will lead to welding stress concentration and uneven penetration, resulting in defects such as incomplete welds, burn-through, or insufficient strength, seriously affecting product lifespan and safety.

[0003] Currently, while auxiliary alignment and clamping devices used for air conditioning duct welding have simplified operations to some extent, they still have the following significant technical shortcomings when facing diverse and high-precision production demands: Lacking proactive adaptability to the physical properties of pipes, existing alignment devices suffer from poor versatility and are prone to damaging workpieces: Most existing alignment devices are rigid or solely elastic mechanical structures with fixed clamping forces and support strokes. When welding pipes of different materials (such as softer, denser copper pipes versus harder, less dense stainless steel pipes), the same mechanism applies similar mechanical forces. For copper pipes, excessive rigid clamping or improper support can lead to irreversible indentation deformation; for stainless steel pipes, insufficient clamping force may fail to guarantee stable alignment. The devices cannot proactively adjust preset mechanical parameters based on material properties (density, yield strength), limiting versatility and posing a risk of damaging precision workpieces. Furthermore, for pipes of different diameters, it is often necessary to replace or manually adjust positioning elements such as V-blocks significantly, resulting in low efficiency.

[0004] Limited alignment accuracy makes it difficult to achieve high coaxiality at the microscale: Most devices rely on one-time V-groove positioning or a single set of grippers for alignment. This method can only achieve approximate positioning of the pipe's outer circle. For pipes with uneven wall thickness or slight bends, "false alignment" (i.e., the outer circle is aligned but the inner bore axis does not coincide) is easily produced. The lack of a multi-stage, progressive fine calibration mechanism makes it impossible to further correct microscopic axial tilt and eccentricity after initial alignment. This lack of precision directly translates into fluctuations in welding quality, making it difficult to meet the extremely high coaxiality requirements of pipe welding in aerospace, precision refrigeration, and other fields.

[0005] The cumbersome operation process and inconvenient workpiece handling negatively impact work efficiency: Traditional fixtures often use multiple independent bolts for locking, making adjustment and disassembly time-consuming and labor-intensive. Fine-tuning of the pipe within the fixture (such as circumferential rotation to align the weld) is also difficult due to high frictional resistance at the contact surfaces. After welding, removing the integrated pipe assembly from the complex fixture structure is particularly inconvenient, sometimes requiring complete disassembly of the fixture, which is not only inefficient but may also damage the finished weld due to impact. The lack of smoothness and user-friendly design throughout the process has become a significant factor restricting the pace of mass production.

[0006] Therefore, there is an urgent need in this field for a novel adaptive alignment mechanism. This mechanism should be able to sense and adapt to different pipe materials and diameters, providing just the right amount of flexible support and clamping force; it should possess high-precision multi-level calibration capabilities to ensure excellent coaxiality; simultaneously, its operation should be intuitive and smooth, with convenient workpiece loading and unloading, thereby improving the overall quality, efficiency, and applicability of welding operations. The present invention is proposed precisely to systematically solve the above-mentioned problems. Summary of the Invention

[0007] Technical problems to be solved: Lack of proactive adaptability to the physical properties of pipelines, poor versatility, and easy damage to workpieces: Existing centering devices are mostly rigid or single-elastic mechanical structures, with fixed clamping force and support stroke. When welding pipelines of different materials (such as softer, denser copper pipes and harder, relatively less dense stainless steel pipes), the same mechanism will apply similar mechanical forces. For copper pipes, excessive rigid clamping or improper support may cause irreversible indentation deformation; for stainless steel pipes, insufficient clamping force may not guarantee stable centering. The device cannot actively and preset mechanical parameters according to material properties (density, yield strength), limiting versatility and posing a risk of damaging precision workpieces. Furthermore, for pipelines of different diameters, it is often necessary to replace or manually adjust positioning elements such as V-blocks significantly, resulting in low efficiency.

[0008] Limited alignment accuracy makes it difficult to achieve high coaxiality at the microscale: Most devices rely on one-time V-groove positioning or a single set of grippers for alignment. This method can only achieve approximate positioning of the pipe's outer circle. For pipes with uneven wall thickness or slight bends, "false alignment" (i.e., the outer circle is aligned but the inner bore axis does not coincide) is easily produced. The lack of a multi-stage, progressive fine calibration mechanism makes it impossible to further correct microscopic axial tilt and eccentricity after initial alignment. This lack of precision directly translates into fluctuations in welding quality, making it difficult to meet the extremely high coaxiality requirements of pipe welding in aerospace, precision refrigeration, and other fields.

[0009] The cumbersome operation process and inconvenient workpiece handling negatively impact work efficiency: Traditional fixtures often use multiple independent bolts for locking, making adjustment and disassembly time-consuming and labor-intensive. Fine-tuning of the pipe within the fixture (such as circumferential rotation to align the weld) is also difficult due to high frictional resistance at the contact surfaces. After welding, removing the integrated pipe assembly from the complex fixture structure is particularly inconvenient, sometimes requiring complete disassembly of the fixture, which is not only inefficient but may also damage the finished weld due to impact. The lack of smoothness and user-friendly design throughout the process has become a significant factor restricting the pace of mass production.

[0010] To address the shortcomings of existing technologies, this invention provides an adaptive centering mechanism for welding air conditioning pipes, thereby solving the technical problems mentioned in the background section.

[0011] To achieve the above objectives, the present invention provides the following technical solution: An adaptive centering mechanism for welding air conditioning pipes includes a base, a lower arc plate fixedly installed above the base, an upper arc plate above the lower guard plate, rotating bolts threaded onto the side walls of the upper and lower arc plates, multiple T-shaped support columns inside and at the outlet of the upper and lower arc plates, a centering plate on the side wall of the T-shaped support columns, a torsion spring between the centering plate and the T-shaped support columns, a second sliding ball at the tail of the centering plate, and a limit plate between the upper and lower arc plates and the centering plate.

[0012] In one possible implementation, the upper arc plate and the lower guard plate are connected together by a hinge.

[0013] In one possible implementation, the angle between the interior of the upper and lower arc plates and the T-shaped support column at the outlet of the upper and lower arc plates is fifteen degrees.

[0014] In one possible implementation, a connecting column is slidably mounted inside the base, and a receiving arc plate is fixedly mounted on the top of the connecting column.

[0015] In one possible implementation, a first sliding ball is provided above the receiving arc plate, and an adjusting bolt is threaded onto the side wall of the connecting column.

[0016] In one possible implementation, a bearing is provided at the bottom of the adjusting bolt, and a spring is fixedly installed at the bottom of the bearing.

[0017] In one possible implementation, the connecting column is placed at an angle.

[0018] In one possible implementation, the upper end of the connecting post is a lead screw.

[0019] In one possible implementation, the lower end of the connecting post is a sliding rod.

[0020] In one possible implementation, the bottom of the spring is fixedly mounted to the base.

[0021] Beneficial effects compared to existing technologies: 1. This solution employs a two-stage progressive centering calibration system. The pipe first enters the channel formed by upper and lower arc plates, where the first set of inlet centering plates, under the action of torsion springs, completes the initial precise calibration and clamping. Subsequently, the pipe is pushed to the channel outlet, where the second set of outlet centering plates performs a secondary calibration. Crucially, the initial preset angle of the outlet centering plate is intentionally deflected by approximately fifteen degrees, creating an angular difference with the inlet. This design constitutes a progressive correction relationship from coarse to fine, effectively eliminating any residual minute axial tilt or eccentricity that may remain after the first calibration. This significantly improves the coaxiality of the pipe ends to be welded at the microscale, laying a crucial geometric foundation for obtaining high-quality welds. 2. In this design, the pre-compression of the load-bearing spring can be pre-adjusted using symmetrical adjusting bolts on both sides, thereby actively adjusting the equivalent stiffness and stroke of the entire support system. When handling denser, softer copper pipes, the pre-compression can be increased by screwing in the bolts, limiting the spring stroke and providing more rigid protective support. When handling more rigid pipes such as stainless steel, the stroke can be released by unscrewing the bolts, providing greater flexibility. Simultaneously, the combination of the inclined connecting column and the V-shaped receiving arc plate allows the pipe weight to be automatically converted into the separation distance between the two arc plates, achieving a preliminary centering function where the opening width automatically adjusts according to the pipe diameter and weight. This design, combining material pre-adjustment and diameter self-adaptation, allows a single mechanism to be widely adaptable to pipes of different materials, weights, and diameters, making it highly versatile. 3. This solution employs a low-friction design extensively at key contact points. A first, freely rotatable ball bearing is installed on the receiving arc plate to facilitate axial fine-tuning and rotation after initial pipe placement. A second ball bearing is also embedded at the tail edge of the central plate that ultimately clamps the pipe, allowing for precise circumferential rotation and positioning of the pipe before welding. After welding, the unloading process is extremely simple: simply loosen and remove the rotating bolts on the side wall, and the upper arc plate, connected by a heavy-duty hinge, can be flipped upwards to fully expose the internal space, allowing for easy and damage-free removal of the welded pipe assembly. This combination of low-friction fine-tuning and rapid opening and closing significantly improves operational smoothness and work efficiency, while reducing the risk of surface scratches on the workpiece. Attached Figure Description

[0022] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the receiving arc plate structure of the present invention; Figure 3 This is a schematic diagram of the upper arc plate structure of the present invention; Figure 4 This is a schematic diagram of the rotating bolt structure of the present invention; Figure 5 This is a schematic diagram of the centering plate structure of the present invention; Figure 6 This is a schematic diagram of the T-shaped support column structure of the present invention.

[0024] Legend: 11. Base; 12. Lower arc plate; 13. Upper arc plate; 14. Rotating bolt; 15. T-shaped support column; 16. Center plate; 17. Torsion spring; 18. Second sliding ball; 19. Limiting plate; 21. Connecting column; 22. Receiving arc plate; 23. First sliding ball; 24. Adjusting bolt; 25. Spring. Detailed Implementation

[0025] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings. In the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element 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.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The technical solution in this application addresses the lack of proactive adaptability to the physical properties of pipes, poor versatility, and susceptibility to workpiece damage in the aforementioned background technologies. Existing alignment devices are mostly rigid or single-elastic mechanical structures with fixed clamping forces and support strokes. When welding pipes of different materials (such as softer, denser copper pipes and harder, less dense stainless steel pipes), the same mechanism applies similar mechanical forces. For copper pipes, excessive rigid clamping or improper support can lead to irreversible indentation deformation; for stainless steel pipes, insufficient clamping force may fail to guarantee stable alignment. The devices cannot actively adjust preset mechanical parameters based on material properties (density, yield strength), limiting versatility and posing a risk of damaging precision workpieces. Furthermore, for pipes of different diameters, it is often necessary to replace or manually adjust positioning elements such as V-blocks significantly, resulting in low efficiency.

[0030] Limited alignment accuracy makes it difficult to achieve high coaxiality at the microscale: Most devices rely on one-time V-groove positioning or a single set of grippers for alignment. This method can only achieve approximate positioning of the pipe's outer circle. For pipes with uneven wall thickness or slight bends, "false alignment" (i.e., the outer circle is aligned but the inner bore axis does not coincide) is easily produced. The lack of a multi-stage, progressive fine calibration mechanism makes it impossible to further correct microscopic axial tilts and eccentricities after initial alignment. This lack of precision directly translates into fluctuations in welding quality, making it difficult to meet the extremely high coaxiality requirements of pipe welding in fields such as aerospace and precision refrigeration.

[0031] The cumbersome operation process and inconvenient workpiece handling negatively impact work efficiency: Traditional fixtures often use multiple independent bolts for locking, making adjustment and disassembly time-consuming and labor-intensive. Fine-tuning of the pipe within the fixture (such as circumferential rotation to align the weld) is also difficult due to high frictional resistance at the contact surfaces. After welding, removing the integrated pipe assembly from the complex fixture structure is particularly inconvenient, sometimes requiring complete disassembly of the fixture, which is not only inefficient but may also damage the finished weld due to impact. The lack of smoothness and user-friendly design throughout the process has become a significant factor restricting the pace of mass production. The overall approach is as follows:

[0032] Example Please refer to Figures 1 to 6 As shown in the figure, this embodiment introduces the specific structure of an adaptive centering mechanism for air conditioning pipe welding, including a rigid welding base 11. The base 11 is fixed to the workbench by a bottom mounting plate to support all the weight and operating stress of the entire centering and clamping device. Its main frame and upper plane are precision machined to provide accurate positioning reference and installation space for all subsequent adjustment, support, clamping and flipping parts.

[0033] In use, the mechanism is first pre-adjusted according to the material characteristics of the pipe to be welded. Adjusting bolts 24 are symmetrically arranged on both sides of the mechanism. To facilitate the rotation of the adjusting bolts 24, a bearing is set at the bottom of the adjusting bolts 24. The bearing is connected to the spring 25. When the pipe material is a relatively soft metal with a high density, such as copper, the operator needs to rotate the adjusting bolts 24 clockwise. At this time, the end of the adjusting bolts 24 will start from the initial position and move from top to bottom. The bearing at the bottom of the adjusting bolts 24 will directly contact and pre-compress the upper end face of the bearing spring 25 below, thereby applying an initial pre-compression to the spring 25. In essence, this changes the initial position and equivalent stiffness of the spring 25 when it begins to resist external forces, that is, it adjusts the elastic coefficient of the spring 25 when it is subsequently loaded. After the pre-adjustment is completed, the air conditioning pipe is placed horizontally above the V-shaped opening formed by the receiving arc plates 22 on both sides. Due to the pressure of the weight of the pipe, the receiving arc plates 22 will drive the connecting column 21 at the bottom to overcome the force of the spring 25 and move from top to bottom. The connecting column 21 is slidably mounted on the inclined plate above the base 11 through a linear bearing. Within the inclined guide groove, its movement trajectory is precisely constrained. When the pipe is pressed down, the spring 25 will also be further compressed by the force. However, since the pre-adjustment of the adjusting bolt 24 limits the maximum compressible stroke of the spring 25, the actual compression of the spring 25 in this case will be reduced. This means that the connecting column 21 slides down a shorter distance, which is suitable for heavy but potentially deformable copper pipes. When a pipe of the same material with a larger diameter and heavier weight is used, the downward pressure is greater, and the connecting column 21 will also descend more accordingly, but still within the preset elastic range. When the pipe material is changed to stainless steel, since stainless steel is usually less dense than copper and more rigid, the required centering clamping force characteristics are different. At this time, the adjusting bolt 24 needs to be rotated counterclockwise, and the bolt will move from bottom to top, reducing or releasing the pre-compression on the spring 25, releasing more of the free stroke and deformation of the spring 25. The subsequent usage method is the same as above, except that due to the change in the pre-tightening force of the spring 25, the range in which the connecting column 21 can slide under the same pipe weight is increased to adapt to the flexible support characteristics required by different materials.

[0034] The connecting columns 21 are not placed vertically, but are symmetrically installed in the upper guide groove of the base 11 at a certain angle. Therefore, when the pipe is placed above the receiving arc plate 22, under the action of the vertical component of the pipe's weight, the two connecting columns 21 will slide synchronously from the middle position to the sides along their respective inclined guide grooves. At this time, the two receiving arc plates 22 will also separate from each other as the connecting columns 21 move. The core of this design is that when the pipe diameter is larger and the weight is usually heavier, the vertical force pressed on the V-shaped arc surface is greater, resulting in a longer distance for the connecting columns 21 to slide down the inclined surface, and a larger center distance between the two receiving arc plates 22. This allows for automatic adjustment of the opening width, perfectly receiving and initially supporting pipes of different diameters. In addition, multiple freely rotatable first sliding balls 23 are installed above the inner arc surface of each receiving arc plate 22. These first sliding balls 23 can greatly reduce the sliding friction between the pipe and the arc plate, making it easier for the pipe to be finely adjusted or rotated axially on the receiving arc plate 22 after initial positioning.

[0035] After initial placement, the operator pushes the pipe from both sides towards the center of the mechanism. The pipe then enters the circular or semi-circular calibration channel formed by the closing of the upper arc plate 13 and the lower arc plate 12. Multiple sets of radially movable centering plates 16 are installed on the inner circumference of the upper arc plate 13 and the lower arc plate 12. Since the bottom of each centering plate 16 is connected to a limiting plate 19 via a pivot, and this limiting plate 19 engages with a groove on the inner wall of the arc plate, all centering plates 16 maintain a directional flow under the action of the bottom torsion spring 17 when no external force is applied. The initial angle of the slightly protruding pipe along the central axis, when the pipe end contacts these centering plates 16, will push the centering plate 16 to overcome the torque of its bottom torsion spring 17, spreading outward from the center. At this time, the torsion spring 17 connecting the centering plate 16 and the T-shaped support column 15 behind it will be subjected to force and undergo torsional deformation until the inner arc surface of the centering plate 16 is completely in contact with the outer wall of the pipe, clamping the pipe. This process completes the first precise calibration and centering of the pipe. Since the receiving arc plate 22 only plays a role in load-bearing and rough centering, the pipe will undergo... During the initial calibration, slight axial tilt or eccentricity may still exist. Therefore, multiple sets of identical centering plates 16 are also installed at the outlets of the upper arc plate 13 and lower arc plate 12 channels. The principle is the same as that of the centering plates 16 inside the channels, but the key difference is that the centering plate 16 at the outlet has its pre-set angle protruding towards the center intentionally deflected by about fifteen degrees during initial installation. This angle difference forms a progressive correction relationship with the centering plate 16 at the inlet, allowing for a second, more precise axial calibration of the pipe after the initial calibration. The pipe is then adjusted to achieve a more perfect final centering adjustment. Subsequently, the pipe is pushed until its end protrudes several centimeters from the outlet of the upper arc plate 13 and the lower arc plate 12 to reserve space for welding operations. A second sliding ball 18 is also embedded at the tail edge of each set of centering plates 16. Its function is also to greatly reduce the friction between the pipe and the clamping components after final positioning, so as to facilitate the precise circumferential rotation adjustment of the pipe during the welding preparation stage. The clamping and centering operation process of the pipe on the other side is completely symmetrical, and will not be repeated here.

[0036] After the welding operation is completed, the workpiece needs to be removed. At this time, the operator first loosens and removes the rotating bolts 14 used to lock the side walls of the upper arc plate 13 and the lower arc plate 12. After the rotating bolts 14 are completely unscrewed, since one side of the upper arc plate 13 and the lower arc plate 12 are connected together by a heavy-duty hinge and the other side is locked by the rotating bolts 14, after the rotating bolts 14 are released, the upper arc plate 13 can be flipped up and opened along the hinge axis to fully expose the internal space and easily remove the welded pipe assembly, thus completing the entire work cycle.

[0037] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An adaptive centering mechanism for welding air conditioning pipes, comprising a base (11), characterized in that, A lower arc plate (12) is fixedly installed above the base (11), and an upper arc plate (13) is provided above the lower guard plate. Rotary bolts (14) are threaded on the side walls of the upper arc plate (13) and the lower arc plate (12). Multiple T-shaped support columns (15) are provided inside the upper arc plate (13) and the lower guard plate and at the outlet. A centering plate (16) is provided on the side wall of the T-shaped support column (15). A torsion spring (17) is provided between the centering plate (16) and the T-shaped support column (15). A second sliding ball (18) is provided at the tail of the centering plate (16). A limit plate (19) is provided between the upper arc plate (13) and the lower arc plate (12) and the centering plate (16).

2. The adaptive centering mechanism for welding air conditioning pipes as described in claim 1, characterized in that, The upper arc plate (13) and the lower guard plate are connected together by a hinge.

3. The adaptive centering mechanism for welding air conditioning pipes as described in claim 1, characterized in that, The angle between the interior of the upper arc plate (13) and the lower arc plate (12) and the T-shaped support column (15) at the exit of the upper arc plate (13) and the lower arc plate (12) is fifteen degrees.

4. The adaptive centering mechanism for welding air conditioning pipes as described in claim 1, characterized in that, A connecting column (21) is slidably installed inside the base (11), and a receiving arc plate (22) is fixedly installed on the top of the connecting column (21).

5. The adaptive centering mechanism for welding air conditioning pipes as described in claim 4, characterized in that, A first sliding ball (23) is provided above the receiving arc plate (22), and an adjusting bolt (24) is threaded on the side wall of the connecting column (21).

6. The adaptive centering mechanism for welding air conditioning pipes as described in claim 5, characterized in that, The bottom of the adjusting bolt (24) is provided with a bearing, and a spring (25) is fixedly installed at the bottom of the bearing.

7. The adaptive centering mechanism for welding air conditioning pipes as described in claim 6, characterized in that, The connecting column (21) is placed at an angle.

8. The adaptive centering mechanism for welding air conditioning pipes as described in claim 7, characterized in that, The upper end of the connecting column (21) is a lead screw.

9. The adaptive centering mechanism for welding air conditioning pipes as described in claim 8, characterized in that, The lower end of the connecting column (21) is a sliding rod.

10. The adaptive centering mechanism for welding air conditioning pipes as described in claim 9, characterized in that, The bottom of the spring (25) is fixedly installed with the base (11).

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