A welding tool for finned tube processing

Abstract

The application belongs to the technical field of welding tooling, and discloses a welding tooling for finned tube processing, which comprises an equipment base, a linear feed guide rail arranged on the equipment base, a workpiece bearing sliding table assembled at the output end of the linear feed guide rail, and a gantry support frame fixedly connected to the middle part of the equipment base. Through the cooperation of the fixed vertical plate, the elastic member, the spherical surface hinged end, the self-adaptive clamping swing plate, the conical insertion surface and the anti-skid strip, the spherical surface self-adaptive hinge structure is used in cooperation with the elastic expansion structure to realize automatic guiding alignment and elastic self-adaptive clamping correction for the sleeve piece type finned tube bundle with a deviation in placement. The welding tooling can adapt to the slight error of fin processing and assembly, avoid the problems of fin deviation, pressure deformation or unstable clamping caused by the traditional rigid clamping mode, and effectively improve the positioning accuracy of finned tube pre-welding operation and the workpiece processing qualification rate.

Description

Technical Field

[0001] This invention belongs to the field of welding tooling technology, specifically a welding tooling for finned tube processing. Background Technology

[0002] Finned tube heat exchangers are widely used in heat exchange equipment such as air conditioners and industrial radiators. Their core processing component is the finned tube structure in a broad sense, mainly including the sleeve-type finned tube bundles commonly used in air conditioners and radiators, and traditional spiral finned tubes. The sleeve-type finned tube bundle is assembled from heat exchange copper tubes and aluminum heat dissipation fins. Pre-spot welding the fins to the tubes is a crucial preliminary process before the deep processing of finned tubes. Currently, the industry generally uses conventional tooling equipment to perform clamping and spot welding for the pre-welding of sleeve-type finned tube bundles. A fixed clamping structure limits the assembled finned tube bundle, and then independent spot welding equipment completes the pre-fixation of the fins to the base tube, thus locking the initial assembly position of the fins. This provides a foundation for subsequent precision machining and assembly, and is an essential processing step for the mass production of finned tube heat exchangers.

[0003] For example, a welding fixture for air conditioning finned tubes, disclosed in CN215316470U, relates to the field of fin welding fixture technology. It includes a welding table with a through hole in the center, first sliding grooves on both the left and right sides of the upper surface of the welding table, and clamping blocks that can slide left and right on both sides of the upper surface of the welding table. This structure ensures that the fins on both sides are on the same horizontal plane, prevents fin tilting, and maintains fin symmetry, thus making fin welding simpler and more convenient.

[0004] While the above solutions can prevent fin misalignment and ensure fin symmetry, thus making fin welding simpler and more convenient, existing finned tube pre-welding fixtures mostly use rigid clamping structures without adaptive guidance and elastic compensation structures. They cannot adapt to the slight placement deviations and assembly errors that exist during fin assembly. Rigid clamping is prone to causing fin offset and deformation under pressure, and is also prone to uneven clamping gaps and insecure clamping, which seriously reduces the positioning accuracy of finned tube pre-welding and the workpiece processing qualification rate.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the Invention

[0006] The purpose of this invention is to provide a welding fixture for finned tube processing that can effectively solve the above-mentioned technical problems.

[0007] To achieve the objectives of this invention, the following technical solution is adopted: A welding fixture for finned tube processing includes a base, a linear feed guide rail mounted on the base, and a workpiece carrying slide mounted on the output end of the linear feed guide rail. A gantry support frame is fixedly connected to the middle of the base. A hydraulic telescopic drive cylinder located above the workpiece carrying slide is mounted on the horizontal section of the gantry support frame. The fixture also includes a spot welding execution component located at the output ends of the two hydraulic telescopic drive cylinders in the middle, and an adaptive clamping and positioning mechanism located at the output ends of the two hydraulic telescopic drive cylinders on the sides. The adaptive clamping and positioning mechanism includes a horizontal plate, which is connected to the telescopic end of a corresponding hydraulic telescopic drive cylinder. Multiple parallel fixed vertical plates are fixedly connected to the lower end of the horizontal plate. Each fixed vertical plate has an elastic limiting accommodating groove on its side wall. An elastic element is fixedly connected inside the elastic limiting accommodating groove. A spherical hinge end is fixedly connected to the pushing end of the elastic element. The adaptive clamping and positioning mechanism is also equipped with a pair of adaptive clamping swing plates. A spherical groove is opened on one side of each adaptive clamping swing plate. The adaptive clamping and positioning mechanism is equipped with a linkage sensing component, which includes multiple centered sensing mounting plates fixedly connected to the inner wall of the horizontal plate. Each centered sensing mounting plate has two strip-shaped contact sensors symmetrically fixedly connected to its lower end.

[0008] Preferably, the spherical hinge end and the spherical groove form a spherical movable fit, and the two adaptive clamping swing plates in the same group swing towards each other to form a triangular clamping area.

[0009] Preferably, the clamping wall of the adaptive clamping swing plate is fixedly connected with multiple anti-slip strips. The anti-slip strips are made of non-metallic insulating and wear-resistant material to increase the frictional resistance of the fin clamping contact surface. All the anti-slip strips are evenly distributed along the height direction of the adaptive clamping swing plate.

[0010] Preferably, the lower end of the adaptive clamping swing plate is integrally formed with a tapered insertion surface, and the inclined surface of the tapered insertion surface has a guiding function.

[0011] Preferably, the elastic element is contained and limited inside the elastic limiting groove, and the elastic element can only undergo expansion and contraction deformation along the horizontal groove of the elastic limiting groove, which is used to limit the radial sway and displacement of the elastic element.

[0012] Preferably, each of the centering sensor mounting plates is arranged in the gap between two sets of adjacent adaptive clamping swing plates, and the end of the strip contact sensor away from the centering sensor mounting plate is provided with a groove.

[0013] Preferably, the contour of the groove is adapted to the abutment contour of the upper end of the two adjacent adaptive clamping swing plates. When the adaptive clamping swing plate swings and retracts to reset, it can be embedded in the groove to trigger a sensing signal to detect whether the elastic element is normal, so as to monitor the working status of the clamping mechanism in real time.

[0014] Preferably, the hydraulic telescopic drive cylinder assembled in the horizontal section of the gantry support frame is divided into two independent drive units: a central push rod group and a side push rod group. The two types of push rod groups can sequentially perform downward telescopic pressing actions for simultaneous clamping, correction, and pre-spot welding.

[0015] Preferably, the workpiece carrying slide is slidably mounted on the output end of the linear feed guide, and the linear feed guide limits the workpiece carrying slide to linear displacement only in the horizontal direction, so as to accurately control the workpiece conveying trajectory and ensure the alignment accuracy of workpiece feeding and discharging.

[0016] Preferably, the gantry support frame is a closed frame structure, and the equipment base provides complete support to the bottom of the gantry support frame to resist the reverse impact force generated by the downward pressure of the hydraulic telescopic drive cylinder, thereby improving the rigidity and deformation resistance of the overall tooling structure.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention, through the combination of a fixed vertical plate, elastic element, spherical hinge end, adaptive clamping swing plate, conical insertion surface and anti-slip strip, utilizes the spherical adaptive hinge structure in conjunction with the elastic telescopic structure to achieve automatic guidance and alignment and elastic adaptive clamping correction for finned tube bundles with placement deviations. It can adapt to the small errors in fin processing and assembly, and avoid the problems of fin offset, pressure deformation or insecure clamping that are easily caused by traditional rigid clamping methods. It effectively improves the positioning accuracy and workpiece processing qualification rate of finned tube pre-welding operations. This invention, through the combination of a centrally located sensing mounting plate, a strip-shaped contact sensor, a groove, and an elastic clamping structure, achieves automatic detection of the mechanism's working condition by relying on the positional changes of the adaptive clamping swing plate throughout the clamping and resetting process. It can determine the working performance status of the elastic component in real time, promptly identify fatigue decay and failure faults of the elastic component, and provide early warnings. This solves the defects of traditional finned tube pre-welding equipment, such as lack of self-inspection function, inability to predict faults in advance, and poor long-term operational stability, ensuring the consistency of precision in long-term continuous processing of the tooling. This invention achieves synchronous operation of the fin clamping and correction process and the fin pre-spot welding process by setting up a gantry support frame, multiple sets of hydraulic telescopic drive cylinders, spot welding execution components and adaptive clamping and positioning mechanism. This shortens the processing cycle of a single finned tube and can continuously lock the relative position of the fins and heat exchange base tube throughout the welding process, effectively avoiding fin displacement and collapse caused by high welding temperatures. This significantly improves the overall efficiency and finished product quality of pre-welding processing of finned tubes, especially air conditioner and radiator finned tube bundles. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0019] Figure 1 This is a schematic diagram of the overall structure of the device base of the present invention; Figure 2 This is a schematic diagram of the workpiece welding and placement state structure of the workpiece bearing slide of the present invention; Figure 3 This is a schematic diagram of the gantry support frame structure of the present invention; Figure 4 For the present invention Figure 2 A schematic diagram of a partially truncated enlarged section of the equipment base; Figure 5 This is an exploded view of the adaptive clamping and positioning mechanism of the present invention; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the partial truncation at point A in the middle.

[0020] In the diagram: 1. Equipment base; 2. Linear feed guide rail; 3. Workpiece bearing slide; 4. Gantry support frame; 5. Hydraulic telescopic drive cylinder; 6. Spot welding execution component; 7. Adaptive clamping and positioning mechanism; 700. Horizontal plate; 701. Fixed vertical plate; 702. Elastic limit receiving groove; 703. Elastic element; 704. Spherical hinge end; 705. Spherical groove; 706. Adaptive clamping swing plate; 707. Anti-slip strip; 708. Conical insert; 8. Linkage sensing component; 800. Centered sensor mounting plate; 801. Strip contact sensor; 802. Groove. Detailed Implementation

[0021] To make the objectives, 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. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0022] In the description of this invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation on the scope of protection of this invention. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0023] like Figures 1 to 6 As shown, this invention provides a welding fixture for finned tube processing, including a base 1, a linear feed guide 2 mounted on the base 1, and a workpiece bearing slide 3 mounted on the output end of the linear feed guide 2. A gantry support frame 4 is fixedly connected to the middle of the base 1. A hydraulic telescopic drive cylinder 5 located above the workpiece bearing slide 3 is mounted on the horizontal section of the gantry support frame 4. The fixture also includes: a spot welding execution assembly 6 located at the output ends of the two hydraulic telescopic drive cylinders 5 in the middle, and an adaptive clamping and positioning mechanism 7 located at the output ends of the two hydraulic telescopic drive cylinders 5 on the sides. The adaptive clamping and positioning mechanism 7 includes a horizontal plate 700, which is connected to the telescopic end of the corresponding hydraulic telescopic drive cylinder 5. The lower end of the horizontal plate 700 is fixedly connected to multiple parallel fixed vertical plates 701. Each fixed vertical plate 701 has an elastic limiting accommodating groove 702 on its side wall. An elastic element 703 is fixedly connected inside the elastic limiting accommodating groove 702. The pushing end of the elastic element 703 is fixedly connected to a spherical hinge end 704. The adaptive clamping and positioning mechanism 7 is also equipped with a pair of adaptive clamping swing plates 706. Each adaptive clamping swing plate 706 has a spherical groove 705 on one side.

[0024] The above scheme is adopted: two adaptive clamping swing plates 706 in the same group swing towards each other to form a triangular clamping area. The spherical mating structure enables the adaptive clamping swing plate 706 to generate a small amount of multi-degree-of-freedom swing around the spherical hinge end 704 when subjected to external force, thereby adaptively conforming to the outer wall of finned tubes of different sizes and shapes, avoiding workpiece surface damage or clamping stress concentration caused by rigid clamping.

[0025] like Figures 2 to 6As shown, the adaptive clamping and positioning mechanism 7 is equipped with a linkage sensing component 8. The linkage sensing component 8 includes multiple centered sensing mounting plates 800 fixedly connected to the inner wall of the horizontal plate 700. Two strip-shaped contact sensors 801 are symmetrically fixedly connected to the lower end of each centered sensing mounting plate 800.

[0026] The above solution employs a contour-following design of the groove 802, which ensures that the upper end of the adaptive clamping swing plate 706 can form a precise contour fit with the groove 802 when embedded, guaranteeing the reliability of triggering and the consistency of signals. This linkage sensing mechanism enables real-time online detection of the working status of the elastic element 703. When the elastic element 703 fails to properly push the adaptive clamping swing plate 706 to reset due to fatigue failure, plastic deformation, or jamming, the upper end of the adaptive clamping swing plate 706 will not be able to accurately embed into the groove 802, and the strip contact sensor 801 will not trigger the corresponding sensing signal. Based on this, the control system can determine that there is an abnormality in the elastic element 703 and issue an alarm or stop command in a timely manner. The strip contact sensor 801 can be a contact displacement sensor, which is suitable for installation and use in the narrow space between the fixed vertical plate 701 and the adaptive clamping swing plate 706.

[0027] like Figures 2 to 6As shown, the spherical hinge end 704 and the spherical groove 705 form a spherical movable fit. Two adaptive clamping swing plates 706 in the same group swing towards each other to form a triangular clamping area. Multiple anti-slip strips 707 are fixedly connected to the clamping wall of the adaptive clamping swing plate 706. The anti-slip strips 707 are made of non-metallic insulating and wear-resistant material. All anti-slip strips 707 are evenly distributed along the height direction of the adaptive clamping swing plate 706. The lower end of the adaptive clamping swing plate 706 has an integrally formed conical insert 708. The inclined surface of the conical insert 708 has a guiding function. The elastic element 703 is fully housed and limited inside the elastic limiting receiving groove 702. The elastic element 703 can only expand and contract along the horizontal groove of the elastic limiting receiving groove 702. Each centrally located sensor mounting plate 800 is respectively arranged at the gap position between two groups of adjacent adaptive clamping swing plates 706. The strip contact sensor 801 is away from the centrally located sensor mounting plate 800. The end of the 00 is provided with a groove 802. The contour of the groove 802 is adapted to the abutment contour of the upper end of the two adjacent adaptive clamping swing plates 706. When the adaptive clamping swing plate 706 swings and retracts to reset, it can be embedded in the groove 802 to trigger the sensing signal to detect whether the elastic element 703 is normal. The hydraulic telescopic drive cylinder 5 assembled in the horizontal section of the gantry support frame 4 is divided into two independent drive units: the middle push rod group and the side push rod group. The two types of push rod groups can sequentially perform downward telescopic and pressing actions for clamping correction and pre-spot welding synchronous linkage. The workpiece carrying slide 3 is slidably assembled on the output end of the linear feed guide 2. The linear feed guide 2 limits the workpiece carrying slide 3 to only be able to move linearly in the horizontal direction. The gantry support frame 4 is a closed frame structure. The equipment base 1 forms a complete support for the bottom of the gantry support frame 4 to resist the reverse impact force generated by the downward pressing of the hydraulic telescopic drive cylinder 5.

[0028] The above scheme is adopted: the middle push rod group drives the spot welding execution component 6, and the side push rod group drives the adaptive clamping and positioning mechanism 7. The two are controlled independently. In the specific working process, the side push rod group moves first, driving the adaptive clamping and positioning mechanism 7 to move down to clamp and position the finned tube. After the adaptive clamping and positioning mechanism 7 completes clamping and the linkage sensing component 8 confirms that the elastic element 703 is working normally, the middle push rod group moves again, driving the spot welding execution component 6 to move down to perform pre-spot welding. The timing control of the two-step action ensures that the welding operation is carried out on the premise that the workpiece has been reliably clamped and positioned, effectively avoiding welding position deviation or workpiece displacement caused by premature welding due to incomplete positioning.

[0029] Working principle and usage process of this invention: First, the assembled finned tube bundle is placed stably on the workpiece carrying slide 3. Then, the linear feed guide 2 is activated. Under the limiting constraint of the linear feed guide 2, the workpiece carrying slide 3 can only move linearly in the horizontal direction. The workpiece carrying slide 3 carries the finned tube bundle and continues to move until the finned tube bundle is accurately delivered to the working area directly below the gantry support frame 4. In the initial standby state before the tooling contacts the workpiece, the elastic element 703 continuously pushes the spherical hinge end 704 outward. The spherical hinge end 704 pulls two sets of adaptive clamping swing plates 706 through spherical cooperation. The upper ends of the two adaptive clamping swing plates 706 remain in a retracted state, forming a triangular clamping structure. At this time, the upper edge of the adaptive clamping swing plate 706 is pre-embedded in the groove 802, and the strip contact sensor 801 continuously outputs the initial positioning sensing signal. After the finned tube bundle is aligned, the two types of hydraulic telescopic drive cylinders 5 are simultaneously activated to extend downward. During this process, the side hydraulic telescopic drive cylinder 5 The horizontal plate 700 will move vertically downwards in sync with the horizontal plate 700. Multiple parallel fixed vertical plates 701 are fixedly connected to the lower end of the horizontal plate 700. All fixed vertical plates 701 move synchronously towards the finned tube bundle below, following the horizontal plate 700. Each fixed vertical plate 701 has an inwardly formed elastic limiting groove 702 on its side wall. An elastic element 703 is stably installed inside the cavity of the elastic limiting groove 702. The cavity structure of the elastic limiting groove 702 restricts the elastic element 703 to only move along the elastic limit. The horizontal groove of the accommodating groove 702 completes the expansion and contraction deformation. The elastic element 703 is fixedly connected to the spherical hinge end 704 at the pushing end of the fin. Each set of spherical hinge ends 704 inside the equipment is matched with a pair of adaptive clamping swing plates 706. A spherical groove 705 is opened on the side surface of a single adaptive clamping swing plate 706 facing the spherical hinge end 704. The outer spherical surface of the spherical hinge end 704 and the inner spherical surface of the spherical groove 705 fit together to form a spherical movable fit structure.As the horizontal plate 700 continues to descend, the adaptive clamping swing plate 706 will first contact the fin to be corrected below. The lower end of the adaptive clamping swing plate 706 has an integrally formed conical insertion surface 708. The inclined surface of the conical insertion surface 708 simultaneously plays a guiding role, smoothly guiding the fin with a slight offset into the hollow space between the two adaptive clamping swing plates 706. Multiple anti-slip strips 707 are evenly distributed on the clamping wall of the adaptive clamping swing plate 706 facing the fin. The anti-slip strips 707 directly adhere to the fin surface, thereby increasing the contact friction between the component and the fin. Due to friction, the fins, when squeezed by the two adaptive clamping swing plates 706, will push the two adaptive clamping swing plates 706 to swing slightly outward. Simultaneously, the adaptive clamping swing plates 706, relying on the spherical mating structure, will pull the spherical hinge end 704 to move horizontally outward. During the movement of the spherical hinge end 704, it will simultaneously pull the elastic element 703, causing the elastic element 703 to undergo compression deformation within the elastic limiting receiving groove 702. After the lower ends of the two adaptive clamping swing plates 706 are spread open by the fins, the upper ends of the adaptive clamping swing plates 706... The spherical hinge point will open outwards, and the upper edge will disengage from the groove 802, temporarily disconnecting the initial sensing signal of the strip contact sensor 801. After the fin alignment and positioning are completed, the spot welding execution component 6 completes the pre-spot welding operation between the fins and the heat exchange base tube. After all spot welding processes are completed, the side hydraulic telescopic drive cylinder 5 drives the adaptive clamping positioning mechanism 7 to lift slightly upwards, and the lower end of the adaptive clamping swing plate 706 disengages from the fin tube bundle. The outward pressing force of the fins on the adaptive clamping swing plate 706 completely disappears, and the elastic element 703, which has undergone compression deformation, rebounds and releases the thrust. The spherical hinge end 704 is pushed back to reset. The spherical hinge end 704 pulls the two adaptive clamping swing plates 706 together again, and the upper edge of the adaptive clamping swing plate 706 will reset and be embedded in the internal space of the groove 802. After the adaptive clamping swing plate 706 contacts the strip contact sensor 801 again, the sensing signal will be triggered again. The tooling matching control system collects the reset sensing signal in real time. The system determines that the elastic element 703 inside the elastic limit receiving groove 702 is in a normal deformation working state through the reset signal. If the system can stably acquire a complete reset sensing signal, it means that the clamping mechanism is working normally and the fixture can enter the next workpiece processing cycle. Conversely, if the system cannot stably acquire a valid reset sensing signal, it means that the elastic element 703 has weakened its rebound performance and cannot output the standard lateral clamping force. The system will push a prompt message to remind the operator to replace the elastic element 703 in time to ensure the accuracy of subsequent clamping and calibration operations.

[0030] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0031] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A welding fixture for finned tube processing, comprising a base (1), a linear feed guide (2) mounted on the base (1), and a workpiece bearing slide (3) mounted on the output end of the linear feed guide (2), wherein a gantry support frame (4) is fixedly connected to the middle of the base (1), and a hydraulic telescopic drive cylinder (5) located above the workpiece bearing slide (3) is mounted on the horizontal section of the gantry support frame (4), characterized in that: Also includes: The spot welding execution assembly (6) is set at the output end of the two hydraulic telescopic drive cylinders (5) located in the middle, and the adaptive clamping and positioning mechanism (7) is set at the output end of the two hydraulic telescopic drive cylinders (5) located on the side. The adaptive clamping and positioning mechanism (7) includes a horizontal plate (700), which is connected to the telescopic end of the corresponding hydraulic telescopic drive cylinder (5). The lower end of the horizontal plate (700) is fixedly connected to a number of parallel fixed vertical plates (701). Each fixed vertical plate (701) has an elastic limiting accommodating groove (702) on its side wall. An elastic element (703) is fixedly connected inside the elastic limiting accommodating groove (702). The pushing end of the elastic element (703) is fixedly connected to a spherical hinge end (704). The adaptive clamping and positioning mechanism (7) is also equipped with a pair of adaptive clamping swing plates (706). Each adaptive clamping swing plate (706) has a spherical groove (705) on one side. The adaptive clamping and positioning mechanism (7) is equipped with a linkage sensing component (8), which includes multiple centered sensing mounting plates (800) fixedly connected to the inner wall of the horizontal plate (700). Each centered sensing mounting plate (800) has two strip-shaped contact sensors (801) symmetrically fixedly connected to its lower end.

2. The welding fixture for finned tube processing according to claim 1, characterized in that: The spherical hinge end (704) and the spherical groove (705) form a spherical movable fit, and the two adaptive clamping swing plates (706) in the same group swing towards each other to form a triangular clamping area.

3. The welding fixture for finned tube processing according to claim 1, characterized in that: The clamping wall of the adaptive clamping swing plate (706) is fixedly connected with multiple anti-slip strips (707). The anti-slip strips (707) are made of non-metallic insulating and wear-resistant material, and all the anti-slip strips (707) are evenly distributed along the height direction of the adaptive clamping swing plate (706).

4. The welding fixture for finned tube processing according to claim 1, characterized in that: The lower end of the adaptive clamping swing plate (706) is integrally formed with a conical insert (708), and the inclined surface of the conical insert (708) has a guiding function.

5. The welding fixture for finned tube processing according to claim 1, characterized in that: The elastic element (703) is contained and limited inside the elastic limiting receiving groove (702), and the elastic element (703) can only generate expansion and contraction deformation along the horizontal groove of the elastic limiting receiving groove (702).

6. The welding fixture for finned tube processing according to claim 1, characterized in that: Each of the central sensing mounting plates (800) is respectively arranged in the gap between two sets of adjacent adaptive clamping swing plates (706), and the end of the strip contact sensor (801) away from the central sensing mounting plate (800) is provided with a groove (802).

7. The welding fixture for finned tube processing according to claim 6, characterized in that: The contour of the groove (802) is adapted to the abutment contour of the upper end of the two adjacent adaptive clamping swing plates (706). When the adaptive clamping swing plate (706) swings and retracts to reset, it can be embedded in the groove (802) to trigger the sensing signal.

8. The welding fixture for finned tube processing according to claim 1, characterized in that: The hydraulic telescopic drive cylinder (5) assembled in the horizontal section of the gantry support frame (4) is divided into two independent drive units: the middle push rod group and the side push rod group. The two push rod groups can perform downward telescopic and pressing actions in sequence.

9. The welding fixture for finned tube processing according to claim 1, characterized in that: The workpiece carrying slide (3) is slidably mounted on the output end of the linear feed guide (2), and the linear feed guide (2) limits the workpiece carrying slide (3) to linear displacement only in the horizontal direction.

10. The welding fixture for finned tube processing according to claim 1, characterized in that: The gantry support frame (4) is a closed frame structure, and the equipment base (1) provides complete support to the bottom of the gantry support frame (4).

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