A boiler finned coil production welding tool

Abstract

The present application relates to the technical field of finned coil production, and particularly relates to a boiler finned coil production welding tool. The technical scheme comprises the following: a bottom plate; a buffer assembly arranged on the bottom plate; a support seat elastically supported on the bottom plate through the buffer assembly and used for placing a coil; a fixing assembly installed on the support seat and used for fixing the coil; a clamping assembly used for pressing fins against the side surface of the coil; the support seat is configured to move downward under the action of gravity of the coil when the support seat bears the coil; the tool further comprises a linkage mechanism matched with the support seat, so that the fixing assembly is driven to exert a fixing force on the coil and the clamping assembly is driven to exert a clamping force on the fins when the support seat moves downward. The present application synchronously completes inner support fixing and pneumatic clamping by utilizing the gravity of the coil to drive, the fixing force is self-adapting, and the operation is simple, convenient and efficient.

Description

Technical Field

[0001] This invention relates to the field of finned coil manufacturing technology, specifically to a welding fixture for boiler finned coil manufacturing. Background Technology

[0002] Boiler finned coils are a common type of heat exchange element, consisting of a coil and fins welded to both sides of the coil. During production, the coil and fins must first be positioned and fixed in a fixture before welding. The precision and stability of the clamping directly affect the weld quality and product yield.

[0003] Currently, these types of welding fixtures generally have the following problems in actual use.

[0004] First, securing the coil is cumbersome. Common methods involve using chucks, bolts, or manually operated internal supports at both ends of the coil, requiring operators to tighten or adjust multiple locking points individually. This process is not only time-consuming but also results in uneven fixing force due to inconsistent force application habits among operators, affecting the consistency of positioning accuracy. While some fixtures are equipped with pneumatic or hydraulically driven clamping mechanisms, they require an air source, hydraulic station, and corresponding piping systems, increasing the overall complexity of the equipment. Furthermore, the pipelines and joints are easily damaged in the environment of welding spatter and high-temperature radiation.

[0005] Secondly, the clamping of the fins also presents inconveniences. The fins need to be tightly attached to the outer wall of the coil. If the fit is not tight, problems such as incomplete welds or poor penetration can easily occur during welding. Current practices often involve manual pressing followed by spot welding for positioning, or using separate quick clamps to clamp each fin individually. These methods are cumbersome and inefficient, and the edges of the fins are prone to warping when subjected to clamping force, requiring operators to repeatedly check and adjust, increasing auxiliary time.

[0006] Furthermore, the fixing force of most tooling is preset and cannot be automatically adjusted according to the actual weight or size changes of the workpiece. For different specifications of coils, it is often necessary to replace tooling components or reset air pressure and stroke parameters, resulting in poor versatility. On production lines that require frequent changes in product specifications, this changeover adjustment work will consume a lot of time. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a welding fixture for boiler finned coil production, which solves the problems mentioned in the background art.

[0008] The solution of the present invention to the above-mentioned technical problems is as follows: This invention provides a welding fixture for the production of boiler finned coils, comprising: Base plate; A buffer assembly is disposed on the base plate; The support base, elastically supported on the base plate by the buffer assembly, is used to place the coil. A fixing component, installed on the support base, is used to fix the coil; Clamping assembly for pressing the fins against the side of the coil; The support base is configured to move downward under the weight of the coil when it is supporting the coil. The tooling also includes a linkage mechanism, which cooperates with the support base to drive the fixing component to apply a fixing force to the coil and drive the clamping component to apply a clamping force to the fins when the support base moves down.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the linkage mechanism includes: A rack is fixed to the base plate; A gear is mounted on the fixing assembly and meshes with the rack. When the support seat moves down, it drives the gear to rotate along the rack, thereby driving the fixing assembly to fix the coil.

[0011] The beneficial effects of adopting the above-mentioned further solutions are: The gear and rack meshing transmission method is simple in structure and reliable in operation, requiring no additional motor or handle drive device. The linear motion of the support base moving downward is directly converted into the rotational motion of the gear, and the entire process is completed by the weight of the coil itself, without consuming additional energy. The rotation angle of the gear corresponds strictly to the downward movement distance of the support base; the further the support base moves downward, the larger the gear rotation angle, and the stronger the internal support force of the fixing component, achieving automatic matching between the fixing force and the weight of the workpiece. This rigid mechanical transmission can maintain stable transmission accuracy even under frequent clamping and welding vibration conditions, and requires very little maintenance.

[0012] Furthermore, the fixing component includes an inner support mechanism, which includes an outer cylinder, a threaded rod, a wedge, and an elastic plate; the gear is fixed to one end of the threaded rod, the threaded rod is rotatably disposed within the inner support mechanism, and threadedly engages with the wedge; the elastic plate is mounted on the outer cylinder via a pull rod, and a slider is provided at the bottom of the elastic plate; the wedge moves under the drive of the threaded rod and cooperates with the slider to expand the elastic plate outward, thereby tightening the coil from the inner wall of the coil.

[0013] The beneficial effects of adopting the above-mentioned further solutions are: The threaded engagement between the threaded rod and the wedge has a self-locking characteristic. When the support stops moving downwards, the wedge's position is locked by the thread, preventing the expansion force on the elastic plate from retracting and ensuring the long-term stability of the fixed state. The wedge, by pushing the elastic plate with a slider, converts the small axial movement of the wedge into a large radial expansion of the elastic plate, effectively amplifying the stroke and allowing the entire mechanism to provide sufficient tension within a compact space. The large contact surface between the elastic plate and the inner wall of the coil ensures uniform tension force distribution, preventing localized damage to the pipe wall.

[0014] Furthermore, the elastic plate, in its unexpanded state, is interference-fitted with the inner wall of the coil to initially position the coil and prevent it from rotating.

[0015] The beneficial effects of adopting the above-mentioned further solutions are: When placing the coil, the operator simply inserts the end of the coil into the inner support mechanism, and the elastic plate temporarily holds the coil in place through the friction generated by the interference fit. This pre-positioning function allows the operator to free their hands for other adjustments without constantly holding the coil. Simultaneously, the initial friction generated by the interference fit prevents the coil from rotating freely before welding, maintaining the relative position of the coil and fins and providing accurate initial positioning for subsequent automatic clamping and welding operations.

[0016] Furthermore, the linkage mechanism includes a buffer airbag disposed between the support base and the base plate. The buffer airbag is pneumatically connected to the clamping assembly so that when the support base moves down to compress the buffer airbag, the clamping assembly is driven to move by air pressure.

[0017] The beneficial effects of adopting the above-mentioned further solutions are: By utilizing a buffer airbag to convert gravitational potential energy into air pressure energy, pneumatic drive without electricity or a centralized air source is achieved. The airbag itself has a simple structure, low cost, is insensitive to welding environments such as dust and spatter, and has strong adaptability. The buffer airbag also has a certain damping effect when compressed, which can slow down the downward movement of the support base and avoid damage to the workpiece and tooling caused by the hard impact when placing the coil.

[0018] Furthermore, the clamping assembly includes a clamping cylinder, and the buffer airbag is equipped with two one-way valves. When the support seat moves down to compress the buffer airbag, the air in the buffer airbag is forced into the clamping cylinder through one of the one-way valves, causing the top rod of the clamping cylinder to extend and press the fins against the coil. When the support seat returns to its original position, the buffer airbag draws in external air through the other one-way valve.

[0019] The beneficial effects of adopting the above-mentioned further solutions are: The design of two one-way valves completely separates the exhaust power circuit and the intake reset circuit, ensuring they do not interfere with each other. During compression, gas flows only unidirectionally to the clamping cylinder, preventing leakage from the intake valve and guaranteeing stable clamping force. During reset, the air bladder is independently replenished from the intake valve, preventing backflow of gas from the cylinder that could lead to premature loss of clamping force. The entire air circuit circulation is automatically completed by the lifting and lowering of the support base, requiring no air circuit switching control components, resulting in a simple structure and reliable operation.

[0020] Furthermore, the buffer assembly includes a support plate, which is threadedly installed, and the buffer airbag is supported between the support plate and the support base.

[0021] The beneficial effects of adopting the above-mentioned further solutions are: The support plate is threaded, and its height can be adjusted by rotating it, thereby changing the initial compression of the buffer airbag and the initial height of the support base. This adjustment method can accommodate coils of different diameters, or allow for fine-tuning when there are slight dimensional deviations in coils of the same specification, expanding the applicability of the tooling and facilitating initial commissioning and subsequent maintenance of the equipment.

[0022] Furthermore, a spring is also provided on the base plate, which abuts against the lower part of the support base to assist the support base in resetting upward.

[0023] The beneficial effects of adopting the above-mentioned further solutions are: After welding is completed and the coil is removed, the gravitational load above the support disappears, and the spring's stored elasticity actively pushes the support upward. This ensures that the support can quickly and completely return to its initial position, preventing incomplete reset due to insufficient airbag rebound force or mechanism jamming, thus preparing it for the next clamping. The spring and airbag provide dual protection in the reset action, improving the reliability of the tooling for repeated use.

[0024] Furthermore, the support base has limiting grooves on both sides for accommodating the fins, and the side wall of the limiting groove is provided with a sliding groove. The sliding cover is slidably installed through the sliding groove and can cover the fins to prevent the fins from warping.

[0025] The beneficial effects of adopting the above-mentioned further solutions are: The limiting groove provides a definite placement position for the fins, eliminating the need for operators to repeatedly measure and adjust their positions, thus simplifying the placement process. After the sliding cover is fastened above the fins, it creates a rigid constraint on the fin edges from the top. When the clamping cylinder applies pressure from the side, the fins will not lift upwards due to uneven force. This dual-direction approach ensures the bonding quality between the fins and the coil, directly improving the success rate of subsequent welding.

[0026] Furthermore, the fixing components are provided in two sets, respectively located on the support base at the positions corresponding to both ends of the coil.

[0027] The beneficial effects of adopting the above-mentioned further solutions are: By simultaneously fixing the coil to internal supports at both ends, a double-sided support structure is formed. Compared with single-sided fixing, the coil is subjected to force at both ends simultaneously, resulting in a more balanced force distribution and eliminating the cantilever effect. This completely eliminates the risk of one end of the coil tilting or deflecting during welding, making it particularly suitable for clamping and positioning coil workpieces that are long or have poor rigidity.

[0028] As can be seen, the welding fixture for boiler finned coil production provided by this invention has the following beneficial effects: The downward movement of the support base simultaneously triggers two sets of actions: internal bracing and pneumatic clamping. This design eliminates the need for manual locking of each workpiece or the configuration of an external power source. Operators only need to place and remove the coil, significantly shortening welding preparation time and improving the efficiency of mass production.

[0029] The fixing assembly expands outward from the inner walls at both ends of the coil using an internal support method. The magnitude of the internal support force is directly related to the weight of the coil; the heavier the coil, the longer the support seat moves downward, the more rotations the gears make, and the greater the extent to which the wedge pushes the elastic plate to expand. This self-amplifying force characteristic allows this fixture to adapt to coils of different specifications and weights, always providing a firm support that matches the weight of the workpiece. This effectively prevents the coil from rotating and axially shifting during welding, ensuring the consistency and stability of the weld quality.

[0030] The pressure required to clamp the fins is provided by the air pressure generated by the compression of the buffer airbag. As the support moves downward, it compresses the airbag, forcing air into the clamping cylinder. The cylinder's push rod then extends, pressing the fins firmly against the coil's sidewall. The entire operation is gravity-triggered, requiring no additional air source or electrical circuitry. This highly integrated design consumes no extra energy and avoids operational interference caused by dragging pipelines. The one-way valve configuration allows the airbag to expel air during compression and automatically draw in air during retraction, ensuring a smooth and reliable process.

[0031] The tooling's reset also relies on the machine's own stored energy, requiring no human intervention. After the welded coil is removed, a spring on the base plate pushes the support seat upwards, helping it to quickly return to its original shape. At this time, the buffer airbag increases in volume, drawing air from the outside through another one-way valve to restore its initial shape. Simultaneously, the gear rotates in the opposite direction as the support seat rises, causing the inner support mechanism to retract, expelling the air from the clamping cylinder, and retracting the push rod. The entire process is completed seamlessly, and the tooling immediately returns to a state ready to load the next workpiece, making it ideal for fast-paced continuous welding operations. Attached Figure Description

[0032] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0033] In the attached diagram: Figure 1 This is a schematic diagram of the main appearance of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from a half-section bottom view; Figure 3 This is a schematic diagram of the rear half-section structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a front exploded view of the fixed component of the present invention; Figure 6 This is a top-down view of the exploded structure of the fixed component of the present invention.

[0034] The attached diagram lists the components represented by each number as follows: 1. Base plate; 101. Spring; 102. Rack; 2. Coil; 201. Fin; 3. Fixing assembly; 301. Gear; 302. Internal support mechanism; 303. Elastic plate; 304. Slider; 305. Wedge; 306. Tie rod; 307. Outer cylinder; 308. Threaded rod; 4. Buffer assembly; 401. Support plate; 402. Buffer airbag; 5. Support base; 501. Limiting groove; 502. Sliding cover; 503. Slide groove; 6. Clamping cylinder. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1 to 6 As shown, the embodiments provided by the present invention are as follows: Example 1: A welding fixture for boiler finned coil production, comprising: Base plate 1; Buffer assembly 4 is mounted on base plate 1; The support base 5 is elastically supported on the base plate 1 by the buffer component 4 and is used to place the coil 2; Fixing component 3 is installed on support base 5 and is used to fix coil 2; A clamping assembly for pressing the fins 201 against the side of the coil 2; The support base 5 is configured to move downward under the gravity of the coil 2 when it is supporting the coil 2; The tooling also includes a linkage mechanism, which cooperates with the support base 5 to drive the fixing component 3 to apply a fixing force to the coil 2 when the support base 5 moves down, and to drive the clamping component to apply a clamping force to the fins 201.

[0037] Example 2: For gravity-driven mechanical internal support fixing, and to automatically adapt the fixing force to the weight of the coil, for example, such as Figures 1 to 6 As shown, the present invention also includes: The participating organizations include: Rack 102 is fixed to base plate 1; Gear 301, mounted on the fixed assembly 3 and meshing with rack 102, drives gear 301 to rotate along rack 102 when the support base 5 moves downward, thereby driving the fixed assembly 3 to fix the coil 2. The meshing transmission method of gear 301 and rack 102 is simple in structure and reliable in operation, requiring no additional motor or handle or other driving device. The linear motion of the support base 5 moving downward is directly converted into the rotational motion of gear 301, and the entire process is completed by the gravity of the coil 2 itself, without consuming additional energy. The rotation angle of gear 301 strictly corresponds to the downward movement distance of support base 5. The more the support base 5 moves downward, the larger the rotation angle of gear 301, and the stronger the internal support force of the fixed assembly 3, achieving automatic matching between the fixing force and the weight of the workpiece. This rigid mechanical transmission can maintain stable transmission accuracy even under frequent clamping and welding vibration conditions, and has very low maintenance requirements.

[0038] The fixing component 3 includes an inner support mechanism 302, which includes an outer cylinder 307, a threaded rod 308, a wedge 305, and an elastic plate 303. A gear 301 is fixed to one end of the threaded rod 308, which is rotatably disposed within the inner support mechanism 302 and threadedly engaged with the wedge 305. The elastic plate 303 is mounted on the outer cylinder 307 via a pull rod 306, and a slider 304 is provided at the bottom of the elastic plate 303. The wedge 305 moves under the drive of the threaded rod 308 and cooperates with the slider 304 to expand the elastic plate 303 outward, thereby tightening the coil 2 from the inner wall of the coil 2. The threaded engagement between the threaded rod 308 and the wedge 305 has a self-locking characteristic. When the support seat 5 stops moving downward, the position of the wedge 305 is locked by the thread, and the expansion force on the elastic plate 303 will not retract, ensuring the long-term stability of the fixed state. The wedge 305, by pushing the elastic plate 303 through the slider 304, converts the small axial movement of the wedge 305 into a large radial expansion of the elastic plate 303, thus amplifying the stroke and enabling the entire mechanism to provide sufficient tension range within a compact space. The elastic plate 303 has a large contact surface with the inner wall of the coil 2, resulting in a uniform distribution of tension force and preventing localized damage to the pipe wall.

[0039] In its unexpanded state, the elastic plate 303 is interference-fitted with the inner wall of the coil 2 to initially position the coil 2 and prevent it from rotating. When placing the coil 2, the operator only needs to slip the end of the coil into the inner support mechanism 302, and the elastic plate 303 will temporarily hold the coil 2 in place through the friction generated by the interference fit. This pre-positioning function allows the operator to free their hands to make other adjustments without constantly holding the coil 2. At the same time, the initial friction generated by the interference fit prevents the coil 2 from rotating freely before welding, thus maintaining the relative position of the coil 2 and the fins 201, providing accurate initial positioning for subsequent automatic clamping and welding operations.

[0040] Example 3: To achieve pneumatic clamping without an independent air source, gravitational potential energy is used to directly drive the fin clamping action. For example, Figures 1 to 6 As shown, the present invention also includes: The linkage mechanism includes a buffer airbag 402 disposed between the support base 5 and the base plate 1. The buffer airbag 402 is pneumatically connected to the clamping assembly. When the support base 5 moves downward and compresses the buffer airbag 402, the clamping assembly is driven to move by air pressure. The buffer airbag 402 converts gravitational potential energy into air pressure energy, realizing pneumatic drive without electricity or a centralized air source. The airbag itself has a simple structure, low cost, is not sensitive to welding environments such as dust and spatter, and has strong adaptability. The buffer airbag 402 also has a certain damping effect when compressed, which can slow down the downward speed of the support base 5 and avoid damage to the workpiece and tooling caused by the hard impact when the coil 2 is placed.

[0041] The clamping assembly includes a clamping cylinder 6 and two one-way valves installed on the buffer airbag 402. When the support base 5 moves down and compresses the buffer airbag 402, the air inside the buffer airbag 402 is forced into the clamping cylinder 6 through one of the one-way valves, causing the push rod of the clamping cylinder 6 to extend and press the fins 201 against the coil 2. When the support base 5 returns to its original position, the buffer airbag 402 draws in external air through the other one-way valve. The design of the two one-way valves completely separates the exhaust power circuit and the intake reset circuit, preventing them from interfering with each other. During compression, the gas flows only unidirectionally to the clamping cylinder 6 and will not leak from the intake valve, ensuring stable clamping force. During reset, the airbag is independently replenished with air from the intake valve, preventing backflow of gas from the cylinder that could cause premature loss of clamping force. The entire air circuit circulation is automatically completed by the lifting and lowering of the support base 5, requiring no air circuit switching control components, resulting in a simple structure and reliable operation.

[0042] The buffer assembly 4 includes a support plate 401, which is threadedly installed. A buffer airbag 402 is supported between the support plate 401 and the support base 5. The support plate 401 is threaded, and its height can be adjusted by rotating it, thereby changing the initial compression of the buffer airbag 402 and the initial height of the support base 5. This adjustment method can accommodate coils 2 of different diameters, or allow for fine-tuning when there are slight dimensional deviations in coils 2 of the same specification. This expands the applicability of the tooling and facilitates initial equipment commissioning and subsequent maintenance.

[0043] Two sets of fixing components 3 are provided, located on the support base 5 corresponding to both ends of the coil 2. They provide internal support and fixation at both ends of the coil 2 simultaneously, forming a double-sided support structure. Compared to single-sided fixing, the coil 2 is subjected to force at both ends simultaneously, resulting in a more balanced force distribution and eliminating the cantilever effect. This completely eliminates the risk of one end of the coil 2 tilting or deflecting during welding, making it particularly suitable for clamping and positioning long or less rigid coil 2 workpieces.

[0044] Example 4: To ensure that the support can be quickly and completely reset to its initial state after the workpiece is removed, for example, such as Figures 1 to 6 As shown, the present invention also includes: A spring 101 is also installed on the base plate 1. The spring 101 abuts against the bottom of the support seat 5 to assist the support seat 5 in resetting upwards. After the welding is completed and the coil 2 is removed, the gravitational load above the support seat 5 disappears, and the elastic force stored in the spring 101 will actively push the support seat 5 upwards. This ensures that the support seat 5 can quickly and completely return to its initial position, and will not fail to reset properly due to insufficient rebound force of the airbag or jamming of the mechanism, thus preparing for the next clamping. The spring 101 and the airbag form a double guarantee in the reset action, improving the reliability of the tooling for repeated use.

[0045] Example 5: To prevent the fins from warping or shifting during clamping or welding, and to ensure a tight fit between the fins and the coil, for example, Figures 1 to 6 As shown, the present invention also includes: The support base 5 has limiting grooves 501 on both sides to accommodate the fins 201. The side walls of the limiting grooves 501 have sliding grooves 503. A sliding cover 502 is slidably installed through the sliding grooves 503 and can cover the fins 201 to prevent them from warping. The limiting grooves 501 provide a definite placement position for the fins 201, eliminating the need for repeated measurement and adjustment by operators, thus simplifying the placement process. After the sliding cover 502 is fastened to the fins 201, it forms a rigid constraint on the edge of the fins 201 from the top. When the clamping cylinder 6 applies pressure from the side, the fins 201 will not lift upwards due to uneven force. This ensures the adhesion quality between the fins 201 and the coil 2 from two directions, directly improving the pass rate of subsequent welding.

[0046] Working principle: In the initial state, the support base 5 is elastically mounted on the base plate 1 via the buffer assembly 4. The buffer assembly 4 includes a buffer airbag 402, which is equipped with two one-way valves. Limiting grooves 501 are formed on both sides of the support base 5, and sliding covers 502 are installed on the side walls of the limiting grooves 501. At the positions of the support base 5 corresponding to both ends of the coil 2, a set of fixing components 3 is provided, each with a gear 301, and a rack 102 corresponding to the position of the gear 301 is fixed on the base plate 1. In addition, a spring 101 is also installed on the base plate 1 to assist the support base 5 in returning to its original position.

[0047] When starting the clamping process, first place the fins 201 into the limiting grooves 501 on both sides of the support base 5. Then push the sliding cover 502 to lock it onto the fins 201, preventing the edges of the fins 201 from lifting due to force. Next, place the coil 2 onto the support base 5, ensuring that both ends of the coil 2 are embedded in the inner support mechanism 302 of the fixing component 3, and that the two side walls of the coil 2 are tightly fitted to the fins 201. At this point, the weight of the coil 2 acts directly on the support base 5, forcing the support base 5 to move downwards.

[0048] The downward movement of the support base 5 triggers two sets of parallel linkage actions. The first set is a mechanical fixing linkage. When the support base 5 descends, the gear 301 on the fixing component 3 moves downward accordingly, meshes with the rack 102 on the base plate 1, and begins to rotate. The rotation of the gear 301 drives the threaded rod 308 to rotate, and the threaded rod 308 in turn drives the wedge block 305 to move axially. When the wedge block 305 moves, it pushes the slider 304 at the bottom of the elastic plate 303 through the wedge-shaped surface, causing the elastic plate 303 to expand outward. After the elastic plate 303 expands, it applies a supporting force from the inner wall of the coil 2, firmly fixing both ends of the coil 2. The heavier the coil 2, the longer the downward stroke of the support base 5, the larger the rotation angle of the gear 301, and the greater the expansion and supporting force of the elastic plate 303. This internal support method that utilizes gravity to increase force effectively prevents the coil 2 from rotating or loosening during the welding process.

[0049] The second system is a pneumatic clamping linkage. The support base 5 moves down, compressing the buffer airbag 402. The air inside the airbag is forced into the clamping cylinder 6 through one of the one-way valves. Under pneumatic pressure, the push rod of the clamping cylinder 6 extends rapidly, pressing the fins 201 firmly against the side wall of the coil 2. Since the fins 201 are constrained by the limiting groove 501 and the sliding cover 502, they will not tilt. The top pressure of the cylinder ensures that the fins 201 are completely pressed against the coil 2, providing reliable positioning for the subsequent welding operation. At this point, the coil 2 is internally supported and fixed, the fins 201 are pneumatically clamped, and the entire workpiece enters a stable, ready-to-weld state.

[0050] After welding, the operator directly removes the welded coil 2 and fins 201 as a whole. As soon as the coil 2 leaves the support base 5, the gravity acting on the support base 5 immediately disappears. At this time, the spring 101 pre-installed on the base plate 1 pushes the support base 5 upwards, helping it to return to its original position. As the support base 5 rises, the buffer airbag 402 re-inflates, drawing in external air through another one-way valve to restore its original state; simultaneously, the gear 301 rotates in the opposite direction as the support base 5 rises, driving the wedge block 305 to retract via the threaded rod 308, and the elastic plate 303 retracts accordingly, releasing the tension on the inner wall of the coil 2. The gas in the clamping cylinder 6 is also discharged accordingly, the push rod retracts, and the fins 201 are released. At this point, all clamping and fixing mechanisms are released, the fixture returns to its initial unloaded state, and the next set of fins 201 and coil 2 can be loaded.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A welding fixture for manufacturing boiler finned coils, characterized in that, include: Base plate (1); A buffer assembly (4) is disposed on the base plate (1); The support base (5) is elastically supported on the base plate (1) by the buffer assembly (4) and is used to place the coil (2). The fixing component (3) is installed on the support base (5) and is used to fix the coil (2). A clamping assembly for pressing the fins (201) against the side of the coil (2); The support base (5) is configured to move downward under the gravity of the coil (2) when carrying the coil (2); The tooling also includes a linkage mechanism, which cooperates with the support base (5) to drive the fixing component (3) to apply a fixing force to the coil (2) when the support base (5) moves down, and to drive the clamping component to apply a clamping force to the fin (201).

2. The welding fixture for boiler finned coil production according to claim 1, characterized in that: The linkage mechanism includes: A rack (102) is fixed to the base plate (1); The gear (301) is mounted on the fixing component (3) and meshes with the rack (102). When the support base (5) moves down, it drives the gear (301) to rotate along the rack (102), thereby driving the fixing component (3) to move to fix the coil (2).

3. The welding fixture for boiler finned coil production according to claim 2, characterized in that: The fixing component (3) includes an inner support mechanism (302), which includes an outer cylinder (307), a threaded rod (308), a wedge (305), and an elastic plate (303). The gear (301) is fixed to one end of the threaded rod (308), which is rotatably disposed in the inner support mechanism (302) and threadedly engaged with the wedge (305). The elastic plate (303) is mounted on the outer cylinder (307) via a pull rod (306), and a slider (304) is provided at the bottom of the elastic plate (303). The wedge (305) moves under the drive of the threaded rod (308) and cooperates with the slider (304) to expand the elastic plate (303) outward, so as to support the coil (2) from the inner wall of the coil (2).

4. The welding fixture for boiler finned coil production according to claim 3, characterized in that: The elastic plate (303) is in an interference fit with the inner wall of the coil (2) in the unexpanded state to initially position the coil (2) and prevent the coil (2) from rotating.

5. The welding fixture for boiler finned coil production according to claim 1, characterized in that: The linkage mechanism includes a buffer airbag (402) disposed between the support base (5) and the base plate (1). The buffer airbag (402) is pneumatically connected to the clamping assembly so that when the support base (5) moves down to compress the buffer airbag (402), the clamping assembly is driven to move by air pressure.

6. The welding fixture for boiler finned coil production according to claim 5, characterized in that: The clamping assembly includes a clamping cylinder (6), and two one-way valves are installed on the buffer airbag (402). When the support seat (5) moves down to compress the buffer airbag (402), the air in the buffer airbag (402) is forced into the clamping cylinder (6) through one of the one-way valves, causing the push rod of the clamping cylinder (6) to extend and press the fins (201) against the coil (2). When the support seat (5) is reset, the buffer airbag (402) draws in external air through the other one-way valve.

7. The welding fixture for boiler finned coil production according to claim 6, characterized in that: The buffer assembly (4) includes a support plate (401) which is threadedly installed, and the buffer airbag (402) is supported between the support plate (401) and the support base (5).

8. The welding fixture for boiler finned coil production according to claim 1, characterized in that: A spring (101) is also provided on the base plate (1), and the spring (101) abuts against the bottom of the support base (5) to assist the support base (5) in resetting upward.

9. The welding fixture for boiler finned coil production according to claim 1, characterized in that: The support base (5) has limiting grooves (501) on both sides for accommodating the fins (201). The side wall of the limiting groove (501) is provided with a sliding groove (503). The sliding cover (502) is slidably installed through the sliding groove (503) and can cover the fins (201) to limit the fins (201) from warping.

10. The welding fixture for boiler finned coil production according to claim 5, characterized in that: The fixing component (3) is provided in two sets, which are located at the positions of the support base (5) corresponding to the two ends of the coil (2).

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