A heat exchanger welding apparatus

Abstract

This invention relates to the field of welding technology and discloses a heat exchanger welding device, including a welding table. A sliding plate is provided on the top of the welding table for placing and moving a tube sheet. An electric slide rail is fixedly installed on the top of the welding table, and an electric slider is slidably connected to the inner wall of the electric slide rail. A positioning component for clamping the tube is provided on one side of a lifting platform. A pulling component for sliding the sliding plate along the surface of the welding table is provided on one side of the electric slider. A replenishment component for automatically replenishing tubes to the positioning component is provided above the sliding plate. When the positioning component rises and resets with the lifting platform, the pulling component is activated simultaneously, and the sliding plate moves forward a certain distance along the surface of the welding table, so that a set of circular holes under the tube sheet is precisely aligned with the positioning component. During the movement, the replenishment component is triggered to deliver new tubes to the clamping position of the positioning component, ensuring that the tubes and circular holes are automatically aligned during subsequent welding.

Description

Technical Field

[0001] This invention belongs to the field of welding technology: specifically, it relates to a heat exchanger welding device. Background Technology

[0002] A plate heat exchanger is a new type of high-efficiency heat exchanger composed of a series of metal plates with a specific corrugated shape. Thin rectangular channels are formed between the plates, through which heat exchange occurs. Plate heat exchangers are ideal devices for liquid-liquid and liquid-vapor heat exchange. They feature high heat exchange efficiency, low heat loss, compact and lightweight structure, small footprint, easy installation and cleaning, wide application, and long service life.

[0003] In the heat exchanger welding process, the welding of tube sheets and fittings is an essential step. The tube sheet is the core supporting component of the heat exchanger, and the fittings (such as heat exchange tubes) need to be fixed to the tube sheet by welding to form a stable flow channel structure. The fittings are often welded to the two sides of the tube sheet, and multiple fittings need to be welded to the same tube sheet.

[0004] Because multiple pipe fittings need to be welded to the two edges of the same tube sheet, in traditional welding methods, the accuracy of manually adjusting the position of the pipe fittings and the round holes of the tube sheet is low, which easily leads to poor weld quality. Moreover, when welding different points, frequent manual operation is required to move the tube sheet and add pipe fittings, which is not only inefficient but also increases the operational error.

[0005] Therefore, the present invention provides a heat exchanger welding device. Summary of the Invention

[0006] To overcome the shortcomings of the prior art: to solve at least one technical problem raised in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The heat exchanger welding equipment of the present invention includes a welding table, a sliding plate is provided on the top of the welding table, the sliding plate is used to place the tube sheet and drive it to move, an electric slide rail is fixedly installed on the top of the welding table, an electric slider is slidably connected to the inner wall of the electric slide rail, a lifting platform is fixedly connected to one side of the electric slider, a control board is fixedly connected to the bottom of the lifting platform, a plurality of spot welding heads are fixedly connected to one side of the control board, a positioning component for clamping the tube is provided on one side of the lifting platform, a pulling component for driving the sliding plate to slide along the surface of the welding table is provided on one side of the electric slider, and a replenishment component for automatically replenishing the tube to the positioning component is provided above the sliding plate.

[0008] Preferably, the positioning assembly includes two sets of hinge seats, each set having two hinge seats. The hinge seats are fixedly connected to the side of the lifting platform. The inner wall of each hinge seat is hinged with an expansion plate. The expansion plate is divided into a straight section, an arc section, and a folding section. The inner wall of the arc section is fixedly connected with a friction element. One side of the straight section is fixedly connected with a torsion spring. The end of the torsion spring away from the expansion plate is fixedly connected to one side of the hinge seat.

[0009] Preferably, a telescopic rod is fixedly installed on the top of the lifting platform, a connecting plate is fixedly connected to the bottom end of the telescopic rod, and V-shaped plates are symmetrically fixedly connected to the bottom end of the connecting plate. The outer wall of the V-shaped plate is respectively attached to the straight section of the two expansion plates.

[0010] Preferably, the tension assembly includes two rope reels, a rotating rod is fixedly connected between the inner walls of the two rope reels, and a clamping member is symmetrically rotatably connected to the outer wall of the rotating rod. The clamping member is fixedly installed on the top of the welding table. The outer walls of the rope reels are all wound with cables, and one end of the cable is fixedly connected to one side of the slide plate.

[0011] Preferably, a connecting frame is fixedly connected to the top of the electric slider, a ratchet is fixedly connected to the outer wall of the rotating rod, a fixing plate is fixedly connected to the bottom of the connecting frame, a plurality of trapezoidal blocks are provided at one end of the fixing plate, and a spring is fixedly connected between the plurality of trapezoidal blocks and the fixing plate.

[0012] Preferably, the top surface of the welding table is symmetrically provided with a sliding groove, the bottom of the sliding plate is fixedly connected with multiple pulleys, the pulleys are slidably connected to the sliding groove, one end of the sliding plate is provided with a counterweight component that drives the sliding plate to reset, and a locking component that restricts the ratchet is provided above the ratchet.

[0013] Preferably, the locking assembly includes a locking block located in one of the tooth grooves of the ratchet. A limiting post 1 is fixedly connected to the top of the locking block. An inner connecting plate is inserted into the outer wall of the limiting post 1. A spring 2 is provided on the outside of the limiting post 1. The two ends of the spring 2 are fixedly connected to the top of the locking block and the bottom of the inner connecting plate, respectively.

[0014] Preferably, an inner groove seat is fixedly connected to the side of the electric slide rail, one end of the inner connecting plate is slidably connected to the inner wall of the inner groove seat, a limit post two is fixedly connected to the top of the inner connecting plate, a spring three is provided on the outside of the limit post two, and the two ends of the spring three are fixedly connected to the top of the inner connecting plate and the inner wall of the inner groove seat respectively. A pressing block one is fixedly connected to both sides of the inner connecting plate, and a pressing block two is fixedly connected to one side of the slide plate.

[0015] Preferably, the counterweight assembly includes a guide wheel, which is fixedly connected to one side of the welding table, and a connecting rope is fixedly connected to the side of the slide platform, with a counterweight block fixedly connected to the bottom of the connecting rope.

[0016] Preferably, the supplementary component includes two receiving plates, which are fixedly connected to both sides of the welding table. A movable frame is fixedly connected above the sliding plate, and multiple clamping rings are fixedly connected to one side of the movable frame. The distance between each clamping ring is the same as the distance between the circular holes on the tube sheet.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The heat exchanger welding equipment of the present invention uses a positioning component to precisely clamp the tubes, so that the tubes can be accurately inserted into the round holes on the tube sheet after they are lowered, thereby achieving high-precision automatic welding and ensuring the quality of the weld. Two expansion clamps tightly wrap and clamp the outer wall end of the tubes, while friction components increase the friction between the inner wall of the expansion clamps and the tubes, preventing the tubes from accidentally falling off.

[0019] 2. In the heat exchanger welding equipment of the present invention, when the positioning component rises and resets with the lifting platform, the tension component is activated simultaneously, and the sliding plate moves forward a certain distance along the surface of the welding platform, so that a set of circular holes under the tube sheet are precisely aligned with the positioning component. During the movement, the replenishment component is triggered to transport the new tube to the clamping position of the positioning component, ensuring that the tube and the circular hole are automatically aligned during subsequent welding, realizing automatic switching of welding points, improving continuous production efficiency; reducing manual adjustment time and reducing operational errors; and coordinating the positioning and replenishment components to ensure a compact and efficient welding process, adapting to the needs of large-scale production. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional view of the entire invention;

[0022] Figure 2 This is a schematic diagram of the clamping ring structure in this invention;

[0023] Figure 3 This is a schematic diagram of the structure of the sliding platform in this invention;

[0024] Figure 4 This is a schematic diagram of the structure of the electric slide rail in this invention;

[0025] Figure 5 This is a schematic diagram of the structure at the V-shaped plate in this invention;

[0026] Figure 6 This is a schematic diagram of the structure at the expansion joint in this invention;

[0027] Figure 7 This is a schematic diagram of the cable structure in this invention;

[0028] Figure 8 This is a schematic diagram of the structure at the rope winding wheel in this invention;

[0029] Figure 9 This is a schematic diagram of the ratchet structure in this invention;

[0030] Figure 10 This is a schematic diagram of the structure of the inner plate in this invention.

[0031] In the diagram: 1. Welding table; 2. Slide table; 3. Lifting platform; 4. Control panel; 5. Spot welding head; 6. Electric slider; 7. Electric slide rail; 8. Hinge seat; 9. Expanding clamp plate; 10. Friction component; 11. Torsion spring; 12. V-shaped plate; 13. Connecting plate; 14. Telescopic rod; 15. Rope winder; 16. Cable; 17. Pulley; 18. Slide groove; 19. Rotating rod; 20. Clamping component; 21. Ratchet; 22. Connecting frame; 23. Fixing plate; 24. Trapezoidal block; 25. Spring 1; 26. Locking block; 27. Spring 2; 28. Inner connecting plate; 29. ​​Limiting post 1; 30. Inner groove seat; 31. Spring 3; 32. Limiting post 2; 33. Compression block 1; 34. Compression block 2; 35. Connecting rope; 36. Counterweight block; 37. Guide wheel; 38. Moving frame; 39. Clamping ring; 40. Support plate. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0033] like Figures 1 to 10 As shown, the present invention provides a technical solution: a heat exchanger welding device, including a welding table 1, a sliding plate 2 on the top of the welding table 1, the sliding plate 2 being used to place tube sheets and move them, an electric slide rail 7 fixedly installed on the top of the welding table 1, an electric slider 6 slidably connected to the inner wall of the electric slide rail 7, a lifting platform 3 fixedly connected to one side of the electric slider 6, a control board 4 fixedly connected to the bottom of the lifting platform 3, a plurality of spot welding heads 5 fixedly connected to one side of the control board 4, a positioning component for clamping the tubes on one side of the lifting platform 3, a pulling component for driving the sliding plate 2 to slide along the surface of the welding table 1 on one side of the electric slider 6, and a replenishment component for automatically replenishing tubes to the positioning component above the sliding plate 2.

[0034] During operation: This equipment is suitable for simultaneously welding multiple tubes on the same heat exchanger tube sheet to form a stable flow channel structure. In actual use, the tube sheet is placed on the upper surface of the slide plate 2. Multiple sets of round holes for inserting tubes are preset on both sides of the tube sheet. Multiple tubes to be welded are pre-stored in the designated position of the equipment through the replenishment component to ensure the feasibility of automatic material replenishment.

[0035] During welding, current is applied to the electric slide rail 7, allowing the electric slider 6 to slide freely vertically up and down along the inner wall of the slide rail 7. As the electric slider 6 slides downwards, it moves the positioning assembly downwards via the lifting platform 3. The positioning assembly first moves a pair of pipe fittings downwards, inserting them into the first set of circular grooves on both sides of the pipe fittings. The welding structure, consisting of the control board 4 and the spot welding head 5, moves downwards along with the lifting platform 3. When the first pair of pipe fittings is fully inserted into the first set of circular holes in the tube sheet, the spot welding head 5 is aligned with the contact point between the pipe fitting and the circular hole. The control board 4 triggers the spot welding head 5 to complete the current weld point, achieving a fixed connection between the pipe fitting and the tube sheet. After the work is completed, the electric slider 6 rises and resets along the inner wall of the electric slide rail 7, driving the entire positioning assembly forward. During the reset process, the sliding plate 2 moves forward a certain distance along the surface of the welding table 1 via the tension component. After the movement is completed, the sliding plate 2 will move the second set of round holes of the tube to the position directly below the positioning component. Therefore, during the upward reset of the positioning component, the sliding plate 2 can move forward, causing the second set of round holes to move to the position of the next welding point. When the sliding plate 2 moves, the supplementary component will automatically supplement the second pair of tubes to the positioning component for clamping. Thus, when the electric slider 6 drives the positioning component to descend next time, the second pair of tubes and the second set of round holes on the tube plate will be in a vertically aligned relationship, so that the welding work can continue. Each time the electric slider 6 rises, the sliding plate 2 will move stepwise via the tension component.

[0036] Through the above embodiments, the positioning component accurately clamps the pipe fitting, enabling it to be precisely inserted into the round holes on the tube sheet after descent, achieving high-precision automatic welding and ensuring weld quality. When the positioning component rises and resets with the lifting platform 3, the tension component is activated simultaneously, and the sliding plate 2 moves forward a distance along the surface of the welding platform 1, so that the next set of round holes on the tube sheet are precisely aligned with the positioning component. During the movement, the replenishment component is triggered to transport the new pipe fitting to the clamping position of the positioning component, ensuring that the pipe fitting and the round hole are automatically aligned during subsequent welding, realizing automatic switching of welding points, improving continuous production efficiency, reducing manual adjustment time, and reducing operational errors. The coordinated positioning and replenishment components ensure a compact and efficient welding process, adapting to the needs of large-scale production.

[0037] like Figures 4 to 6 As shown, the positioning assembly includes two sets of hinge seats 8, each set of hinge seats 8 has two hinge seats. The hinge seats 8 are fixedly connected to the side of the lifting platform 3. The inner wall of each hinge seat 8 is hinged with an expansion plate 9. The expansion plate 9 is divided into a straight section, an arc section and a folding section. The inner wall of the arc section is fixedly connected with a friction element 10. One side of the straight section is fixedly connected with a torsion spring 11. The end of the torsion spring 11 away from the expansion plate 9 is fixedly connected to one side of the hinge seat 8.

[0038] During operation: Before the first welding, the pipe fitting is pushed into the arc section position along the folded section of the expansion clamping plate 9. The arc sections of the two expansion clamping plates 9 form a complete circular clamping groove to wrap and clamp the outer wall of the pipe fitting. When the pipe fitting is pushed into the arc section, the expansion clamping plate 9 will rotate with the hinge seat 8 and compress the torsion spring 11 to deform. When the pipe fitting enters the circular clamping groove, under the reaction force of the torsion spring 11, the two expansion clamping plates 9 tightly wrap and clamp the outer wall end of the pipe fitting. The friction element 10 increases the friction between the inner wall of the expansion clamping plate 9 and the pipe fitting, preventing the pipe fitting from accidentally falling off.

[0039] like Figures 5 to 6 As shown, a telescopic rod 14 is fixedly installed on the top of the lifting platform 3, and a connecting plate 13 is fixedly connected to the bottom end of the telescopic rod 14. A V-shaped plate 12 is symmetrically fixedly connected to the bottom end of the connecting plate 13, and the outer wall of the V-shaped plate 12 is respectively attached to the straight section of the two expansion clamping plates 9.

[0040] During operation: After the lifting platform 3 lowers the pipe fitting through the positioning component and inserts it into the round hole of the pipe plate, the welding mechanism composed of the control plate 4 and the spot welding head 5 completes the welding. In order to ensure that the pipe fitting is no longer subject to the clamping force of the two expansion plates 9, when the positioning component needs to be raised and reset, the telescopic rod 14 drives the V-shaped plate 12 to move upward synchronously through the connecting plate 13. The inclined surface of the V-shaped plate 12 fits against the straight section of the expansion plate 9. During the upward movement, an outward expansion thrust is gradually applied to the expansion plate 9. The thrust overcomes the elastic force of the torsion spring 11, causing the expansion plate 9 to rotate outward around the hinge seat 8. The arc-shaped clamping groove gradually separates from the outer wall of the pipe fitting, realizing the active release of the clamping force. After the expansion plate 9 is fully opened, the lifting platform 3 drives the positioning component to rise as a whole, avoiding the pipe fitting from being deformed by pressure or shifted in position due to continuous clamping.

[0041] like Figures 7 to 8 As shown, the tension assembly includes two rope reels 15, with a rotating rod 19 fixedly connected between the inner walls of the two rope reels 15. A clamping member 20 is symmetrically rotatably connected to the outer wall of the rotating rod 19. The clamping member 20 is fixedly installed on the top of the welding table 1. Cables 16 are wound around the outer walls of the rope reels 15, and one end of the cable 16 is fixedly connected to one side of the slide table 2.

[0042] During operation: When the electric slider 6 rises, it drives the two rope winding wheels 15 to rotate. As the rope winding wheels 15 rotate, the cable 16 wound on the outer wall gradually shortens, applying a horizontal pulling force to the slide plate 2. The pulling force of the cable 16 overcomes the frictional resistance between the slide plate 2 and the welding table 1, pushing the slide plate 2 to move horizontally along the surface of the welding table 1. After the movement is completed, the slide plate 2 drives the next set of round holes of the tube plate to accurately align directly below the positioning component, and at the same time triggers the replenishment component to complete the automatic replenishment of new tubes.

[0043] like Figures 7 to 9As shown, a connecting frame 22 is fixedly connected to the top of the electric slider 6, a ratchet 21 is fixedly connected to the outer wall of the rotating rod 19, a fixing plate 23 is fixedly connected to the bottom of the connecting frame 22, a plurality of trapezoidal blocks 24 are provided at one end of the fixing plate 23, and a spring 25 is fixedly connected between the plurality of trapezoidal blocks 24 and the fixing plate 23.

[0044] During operation: When the electric slider 6 descends along the inner wall of the electric slide rail 7, it drives the fixed plate 23 to move down synchronously via the connecting frame 22. During the downward movement of the fixed plate 23, multiple trapezoidal blocks 24 pass the position of the ratchet 21 in sequence. Since the surface of the trapezoidal block 24 adjacent to the ratchet 21 is inclined, the trapezoidal block 24 compresses the spring 25 during descent, causing elastic deformation, thus smoothly sliding over the teeth of the ratchet 21. At this time, the ratchet 21 remains stationary and does not rotate. When the electric slider 6 rises along the inner wall of the electric slide rail 7 to reset... At the same time, the fixed plate 23 drives the trapezoidal block 24 to move upward synchronously. During the upward movement of the trapezoidal block 24, its flat end is embedded in the tooth groove of the ratchet 21. Since the flat contact surface cannot squeeze the spring 25, the trapezoidal block 24 applies a unidirectional thrust to the tooth groove when passing through the ratchet 21, driving the ratchet 21 to rotate synchronously with the rotating rod 19. The rotation of the ratchet 21 drives the rope winding wheel 15 to wind the cable 16, thereby pulling the slide platform 2 to complete the step movement, thus realizing the unidirectional drive between the lifting platform 3 and the slide platform 2.

[0045] like Figures 2 to 3 As shown, the top surface of the welding table 1 is symmetrically provided with a sliding groove 18, and the bottom of the sliding plate 2 is fixedly connected with multiple pulleys 17. The pulleys 17 are slidably connected to the sliding groove 18. One end of the sliding plate 2 is provided with a counterweight assembly that drives the sliding plate 2 to reset. Above the ratchet 21, a locking assembly is provided to restrict the ratchet 21.

[0046] During operation: The sliding groove 18 and pulley 17 restrict the movement of the slide platform 2 along the surface of the welding table 1, preventing positional deviation when the tension component moves the slide platform 2. The counterweight component ensures that when the slide platform 2 moves for the last time after all the pipes are welded to the tube sheet, the locking component loses its restriction on the ratchet 21 from rotating in the opposite direction, causing the cable 16 to be released automatically and the slide platform 2 to return to its original position. Under normal conditions, the locking component restricts the ratchet 21 from rotating in the opposite direction after each rotation due to the influence of the counterweight component, so that the slide platform 2 returns to its original position immediately after moving forward a certain distance.

[0047] like Figures 8 to 10As shown, the locking assembly includes a locking block 26, which is located in one of the tooth slots of the ratchet 21. A limiting post 29 is fixedly connected to the top of the locking block 26. An inner plate 28 is inserted into the outer wall of the limiting post 29. A spring 27 is provided on the outside of the limiting post 29. The two ends of the spring 27 are fixedly connected to the top of the locking block 26 and the bottom of the inner plate 28, respectively.

[0048] During operation: When the electric slider 6 rises and drives the ratchet 21 to rotate clockwise, the teeth of the ratchet 21 press against the inclined surface of the locking block 26, forcing the locking block 26 to slide upward against the elastic force of the second spring 27. The first limiting post 29 moves vertically upward along the inner wall of the inner plate 28, the second spring 27 is compressed, and the locking block 26 exits the current tooth groove, allowing the ratchet 21 to rotate unidirectionally and pass through the tooth position. After the ratchet 21 rotates, the locking block 26 is inserted into the next tooth groove under the action of the rebound force of the second spring 27, completing the unidirectional anti-reverse locking of the ratchet 21 and preventing it from reversing due to the counterweight component. The flat end of the locking block 26 is completely abutted against the vertical surface of the tooth groove of the ratchet 21, the second spring 27 is in a pre-tightened state, and the locking block 26 cannot be lifted, ensuring that the stepping position of the slide platform 2 is accurately locked.

[0049] like Figures 7 to 10 As shown, an inner groove seat 30 is fixedly connected to the side of the electric slide rail 7. One end of the inner connecting plate 28 is slidably connected to the inner wall of the inner groove seat 30. A limit post 2 32 is fixedly connected to the top of the inner connecting plate 28. A spring 31 is provided on the outside of the limit post 2 32. The two ends of the spring 31 are fixedly connected to the top of the inner connecting plate 28 and the inner wall of the inner groove seat 30, respectively. An extrusion block 1 33 is fixedly connected to both sides of the inner connecting plate 28. An extrusion block 2 34 is fixedly connected to one side of the slide plate 2.

[0050] During operation: After the last set of welding points is completed on the tube plate on the slide platform 2, the tension component causes the slide platform 2 to continue moving forward along the surface of the welding platform 1. During the movement of the slide platform 2, the second pressing block 34 on its side comes into contact with the first pressing block 33 on the side of the inner plate 28. The inclined surface of the second pressing block 34 applies a vertical upward thrust to the first pressing block 33. After being pushed, the first pressing block 33 drives the inner plate 28 to move vertically upward along the inner wall of the inner groove seat 30. The second limiting post 32 slides synchronously in the guide hole of the inner groove seat 30. The third spring 31 is compressed. When the inner plate 28 moves upward, the locking block 26 at its bottom is lifted synchronously, completely disengaging from the tooth groove of the ratchet 21 and releasing the one-way lock on the ratchet 21. At this time, the ratchet 21 can rotate freely. Under the action of the counterweight component, the slide platform 2 is directly reset to its original position in one go.

[0051] like Figure 2 and Figure 7As shown, the counterweight assembly includes a guide wheel 37, which is fixedly connected to one side of the welding table 1. A connecting rope 35 is fixedly connected to the side of the sliding platform 2, and a counterweight block 36 is fixedly connected to the bottom of the connecting rope 35.

[0052] During operation: When the second extrusion block 34 moves to extrude the first extrusion block 33 upward, the one-way lock of the ratchet 21 is engaged. At this time, under the action of the counterweight block 36, the entire slide platform 2 will return to the initial position in one go, and the staff can remove the welded tube plate and fittings.

[0053] like Figure 2 As shown, the supplementary component includes two receiving plates 40, which are fixedly connected to both sides of the welding table 1. A movable frame 38 is fixedly connected above the sliding plate 2. Multiple clamping rings 39 are fixedly connected to one side of the movable frame 38. The distance between each clamping ring 39 is the same as the distance between the circular holes on the tube sheet.

[0054] During operation: Before the welding operation begins, the operator inserts the pipes to be welded horizontally into the multiple clamping rings 39 on the moving frame 38 in sequence. The top plane of the receiving plate 40 is flush with the bottom plane of the clamping rings 39, which provides stable support for the pipes and prevents the pipes from sagging due to their own weight and misaligning with the round holes of the tube plate. When the sliding table 2 moves along the surface of the welding table 1, the moving frame 38 simultaneously drives all the pipes forward. Each step distance is equal to the distance between adjacent round holes on the tube plate, ensuring that the current pipe is accurately moved to the top of the round hole on the tube plate.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchanger welding device, comprising a welding table, characterized in that: The welding table is equipped with a sliding plate on top, which is used to place the tube sheet and move it. An electric slide rail is fixedly installed on the top of the welding table. An electric slider is slidably connected to the inner wall of the electric slide rail. A lifting platform is fixedly connected to one side of the electric slider. A control board is fixedly connected to the bottom of the lifting platform. Multiple spot welding heads are fixedly connected to one side of the control board. A positioning component for clamping the tube is set on one side of the lifting platform. A tension component for moving the sliding plate along the surface of the welding table is set on one side of the electric slider. A replenishment component for automatically replenishing tubes to the positioning component is set above the sliding plate. The positioning assembly includes two sets of hinge seats, each set having two hinge seats. The hinge seats are fixedly connected to the side of the lifting platform. The inner wall of each hinge seat is hinged with an expansion plate. The expansion plate is divided into a straight section, an arc section, and a folding section. The inner wall of the arc section is fixedly connected with a friction element. One side of the straight section is fixedly connected with a torsion spring. The end of the torsion spring away from the expansion plate is fixedly connected to one side of the hinge seat. A telescopic rod is fixedly installed on the top of the lifting platform. A connecting plate is fixedly connected to the bottom of the telescopic rod. V-shaped plates are symmetrically fixedly connected to the bottom of the connecting plate. The outer wall of the V-shaped plate is respectively attached to the straight section of the two expansion plates. The tension assembly includes two rope reels, with a rotating rod fixedly connected between the inner walls of the two rope reels. A clamping member is symmetrically rotatably connected to the outer wall of the rotating rod. The clamping member is fixedly installed on the top of the welding table. The outer walls of the rope reels are all wound with cables, and one end of the cable is fixedly connected to one side of the slide plate. A connecting frame is fixedly connected to the top of the electric slider, a ratchet is fixedly connected to the outer wall of the rotating rod, a fixing plate is fixedly connected to the bottom of the connecting frame, and multiple trapezoidal blocks are provided at one end of the fixing plate. A spring is fixedly connected between the multiple trapezoidal blocks and the fixing plate.

2. The heat exchanger welding equipment according to claim 1, characterized in that: The top surface of the welding table is symmetrically provided with a sliding groove, and the bottom of the sliding plate is fixedly connected with multiple pulleys. The pulleys are slidably connected to the sliding groove. One end of the sliding plate is provided with a counterweight assembly that drives the sliding plate to reset. Above the ratchet is a locking assembly that restricts the ratchet.

3. The heat exchanger welding equipment according to claim 2, characterized in that: The locking assembly includes a locking block located in one of the tooth slots of the ratchet. A limiting post 1 is fixedly connected to the top of the locking block. An inner plate is inserted into the outer wall of the limiting post 1. A spring 2 is provided on the outside of the limiting post 1. The two ends of the spring 2 are fixedly connected to the top of the locking block and the bottom of the inner plate, respectively.

4. The heat exchanger welding equipment according to claim 3, characterized in that: An inner groove seat is fixedly connected to the side of the electric slide rail. One end of the inner connecting plate is slidably connected to the inner wall of the inner groove seat. A limit post two is fixedly connected to the top of the inner connecting plate. A spring three is provided on the outside of the limit post two. The two ends of the spring three are fixedly connected to the top of the inner connecting plate and the inner wall of the inner groove seat, respectively. An extrusion block one is fixedly connected to both sides of the inner connecting plate, and an extrusion block two is fixedly connected to one side of the slide platform.

5. The heat exchanger welding equipment according to claim 4, characterized in that: The counterweight assembly includes a guide wheel, which is fixedly connected to one side of the welding table. A connecting rope is fixedly connected to the side of the sliding platform, and a counterweight block is fixedly connected to the bottom of the connecting rope.

6. The heat exchanger welding equipment according to claim 5, characterized in that: The supplementary components include two receiving plates, which are fixedly connected to both sides of the welding table. A movable frame is fixedly connected above the sliding plate, and multiple clamping rings are fixedly connected to one side of the movable frame. The distance between each clamping ring is the same as the distance between the circular holes on the tube sheet.

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