An auxiliary tooling for the welding of heat exchanger tube sheets

Abstract

The present invention discloses an auxiliary tooling for welding a heat exchanger tube sheet, comprising: a base, with a first mounting plate and a second mounting plate respectively arranged at both ends of the base, and first through holes and second through holes adapted to the heat exchange tubes being annularly and arrayedly formed on the surfaces of the first mounting plate and the second mounting plate; by providing an expansion wheel assembly, a first gear, a second gear, a rack and an arc-shaped clamping plate, during the process of inserting the heat exchange tube into the first through hole, both sides of the heat exchange tube contact and generate friction with two expansion wheel assemblies at corresponding positions, causing the expansion wheel assemblies to rotate. Under the action of the first gear and the second gear, the rack moves leftward, so that the two arc-shaped clamping plates approach each other to clamp the side wall of the heat exchange tube, hindering the heat exchange tube from continuing to move, making the left end of the heat exchange tube move to a specified position, thereby facilitating the ends of several heat exchange tubes to be located on the same plane and reducing the adjustment difficulty.

Description

Technical Field

[0001] The present invention relates to the field of heat exchanger tube sheet welding equipment, and particularly to an auxiliary tooling for heat exchanger tube sheet welding. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers play an important role in many industrial productions such as chemical industry, petroleum, power, food and others. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators, reboilers, etc., and are widely used; during the production process of heat exchangers, it is necessary to weld heat exchange tubes and tube sheets.

[0003] For example, the invention patent with the publication number CN214721925U discloses a heat exchanger heat exchange tube and tube sheet welding device, including a bottom plate, a heat exchange tube and a tube sheet. The lower surface of the bottom plate is fixedly connected with a first electric push rod and a support leg. The upper surface of the bottom plate is inserted with a moving shaft. The upper surface and the lower surface of the moving shaft are both fixedly connected with moving plates. The output end of the first electric push rod is fixedly connected with the upper surface of the moving plate located at the bottom.

[0004] In the above solution, during the process of welding the tube sheet, it is necessary to insert the heat exchange tubes into the tube sheet one by one, making it difficult to align and keep the ends of several heat exchange tubes flat, and manual adjustment is required. Moreover, the heat exchange tubes lack limit during the welding process, resulting in easy deviation of the heat exchange tubes during the welding process, thereby increasing the adjustment difficulty.

[0005] Therefore, the present invention proposes an auxiliary tooling for heat exchanger tube sheet welding to solve the above problems. Summary of the Invention

[0006] To achieve the above object, the technical solution adopted by the present invention is: an auxiliary tooling for heat exchanger tube sheet welding, including:

[0007] A base, with a first mounting disc and a second mounting disc respectively arranged at both ends of the base. The surfaces of the first mounting disc and the second mounting disc are both annularly and arrayedly provided with a first through hole and a second through hole adapted to the heat exchange tube body;

[0008] Two rotating seats, symmetrically distributed on both sides of the first through hole. The rotating seats are fixedly connected to the left side wall of the first mounting disc;

[0009] An expansion wheel assembly, rotatably connected to the end of the rotating seat. The expansion wheel assembly can be contracted and expanded;

[0010] A first gear, coaxially fixed with the expansion wheel assembly;

[0011] A second gear, which is rotatably connected to the rotating seat and meshes with the first gear;

[0012] A rack, which slidably penetrates through the first mounting plate, meshes with the second gear, and is connected with an elastic connecting piece between the rack and the first mounting plate;

[0013] Two arc-shaped clamping plates, which are slidably connected to the right side wall of the first mounting plate;

[0014] A driving plate, which is fixedly connected to the side wall of the arc-shaped clamping plate. A driving groove is formed on the surface of the driving plate. The driving groove has a straight groove and an inclined groove. A connecting pin is fixedly connected to the end of the rack, and the connecting pin is slidably connected in the driving groove;

[0015] A positioning component, which is used to limit the rack and position the rack at a specified position;

[0016] Specifically, in the prior art, during the process of welding the tube sheet, it is necessary to insert the heat exchange tubes into the tube sheet one by one, making it difficult for the ends of several heat exchange tubes to be aligned and kept flat, and manual adjustment is required. Moreover, during the welding process, the heat exchange tubes lack limitation, resulting in the heat exchange tubes being prone to shift during the welding process, thus increasing the adjustment difficulty. The technical solution of the present invention can solve the above problems. The specific operation is as follows: First, insert the heat exchange tube body from any one of the second through holes in the second mounting plate until the heat exchange tube body protrudes from the corresponding first through hole in the first mounting plate. During the process of the heat exchange tube body inserting into the first through hole, both sides of the heat exchange tube body contact and generate friction with the two expansion wheel assemblies at the corresponding positions, causing the expansion wheel assemblies to rotate, causing the first gear to rotate. Under the meshing effect, the second gear rotates. The second gear drives the rack, causing the rack to move leftward. During the process of the rack moving leftward, the connecting pin moves along the driving groove. The connecting pin first moves along the straight groove. At this time, the two arc-shaped clamping plates stay in place and do not move closer to clamp the heat exchange tube body, so that the end of the heat exchange tube body can protrude leftward from the first through hole and move away from the first mounting plate. Subsequently, the connecting pin moves along the inclined groove. Driven by the inclined groove, the two arc-shaped clamping plates move closer to each other to clamp the side wall of the heat exchange tube body to prevent the heat exchange tube body from continuing to move, so that the left end of the heat exchange tube body moves to the specified position, which is beneficial to making the ends of several heat exchange tube bodies be located on the same plane and reducing the adjustment difficulty;

[0017] And by setting the positioning component, after the arc-shaped clamping plates clamp the heat exchange tube body, the position of the rack is positioned through the positioning component, so that the arc-shaped clamping plates are limited and can stably clamp the heat exchange tube body, which is beneficial to reducing the phenomenon of the heat exchange tube body shifting during the welding process, improving the welding stability and reducing the adjustment difficulty at the same time;

[0018] After welding is completed, first contract the expansion wheel assembly so that the expansion wheel assembly moves away from the side wall of the heat exchange tube body. Subsequently, cancel the positioning effect of the positioning component on the rack. Under the action of the elastic connecting piece, the rack is reset. During the reset movement of the rack, through the drive of the inclined groove, the two arc-shaped clamping plates are reset to cancel the clamping limit on the heat exchange tube body, so as to facilitate pulling out the heat exchange tube body from the first through hole and the second through hole.

[0019] Preferably, the expansion wheel assembly includes:

[0020] An annular shell, the bottom end of the annular shell is rotatably connected with a connecting cover;

[0021] A damping capsule, the damping capsule is fixedly connected to the outer side wall of the annular shell, and the damping capsule is communicated with the inside of the annular shell;

[0022] A pumping mechanism for injecting gas into the annular shell to cause the damping capsule to expand.

[0023] Preferably, the pumping mechanism includes:

[0024] A cavity opened in the first mounting plate;

[0025] A first air pipe, one end of the first air pipe is fixedly connected to the connecting cover, and the other end of the first air pipe is fixedly connected to the first mounting plate;

[0026] A second air pipe, one end of the second air pipe is fixedly connected to the first mounting plate, and the other end is connected to an external air pump.

[0027] Preferably, a ring-shaped connecting plate is rotatably connected to the outer side wall of the first mounting plate. The second air pipe is fixedly connected to the ring-shaped connecting plate. The ring-shaped connecting plate is fixedly connected to the base. The second mounting plate is rotatably connected to the base. A plurality of connecting rods are fixedly connected in an annular array on the right side wall of the first mounting plate. The other ends of the connecting rods are fixedly connected to the side wall of the second mounting plate;

[0028] A plurality of teeth are fixedly connected in an annular array on the outer side wall of the second mounting plate;

[0029] A first motor, a machine base is arranged outside the first motor, and a third gear is fixedly connected to the end of the output shaft of the first motor. The third gear meshes with the teeth.

[0030] Preferably, the positioning component includes:

[0031] A housing, the housing is fixedly connected to the right side wall of the first mounting plate corresponding to the position of the rack, and the housing is communicated with the air cavity;

[0032] A sleeve is fixedly and communicatively connected to the outer sidewall of the housing, and a piston rod is slidably connected inside the sleeve;

[0033] A clamping block is slidably connected to the end of the piston rod, and a second spring is connected between the clamping block and the piston rod;

[0034] A clamping groove is formed on the sidewall of the rack.

[0035] Preferably, the positioning assembly further includes:

[0036] A pulley is rotatably connected to the end of the clamping block, and the pulley contacts the sidewall of the rack at the corresponding position.

[0037] Preferably, the radius of the first gear is smaller than the radius of the second gear.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] First, by setting the expansion wheel assembly, the first gear, the second gear, the rack and the arc-shaped clamping plates, during the process of inserting the heat exchange tube body into the first through hole, the two sides of the heat exchange tube body contact and generate friction with the two expansion wheel assemblies at the corresponding positions, causing the expansion wheel assemblies to rotate. Under the action of the first gear and the second gear, the rack moves to the left, so that the two arc-shaped clamping plates approach each other to clamp the sidewall of the heat exchange tube body, hindering the heat exchange tube body from continuing to move, and moving the left end of the heat exchange tube body to the specified position, which is beneficial to enabling the ends of several heat exchange tube bodies to be located on the same plane and reducing the adjustment difficulty.

[0040] Second, by setting the positioning assembly, after the arc-shaped clamping plates clamp the heat exchange tube body, the position of the rack is positioned through the positioning assembly, so that the arc-shaped clamping plates are limited, and the heat exchange tube body can be stably clamped, which is beneficial to reducing the phenomenon of the heat exchange tube body shifting during the welding process, improving the welding stability while reducing the adjustment difficulty.

[0041] Third, by setting the first motor and the third gear, during the process of inserting the heat exchange tube body, the first motor can be started to make the third gear rotate, thereby driving the second mounting plate and the first mounting plate to rotate, so as to move the position where the heat exchange tube body has not been inserted to the specified position. On the one hand, it is convenient for the heat exchange tube body to be inserted, and on the other hand, it is convenient to adjust the un-welded position to the specified position for welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic diagram of the overall structure of the present invention Figure 1 ;

[0043] Figure 2 is a schematic diagram of the overall structure of the present inventionFigure 2 ;

[0044] Figure 3 Schematic connection diagram of the first mounting plate and the annular connecting plate in the present invention;

[0045] Figure 4 Schematic connection diagram of the first mounting plate and the arc-shaped clamping plate in the present invention;

[0046] Figure 5 Schematic connection diagram of the arc-shaped clamping plate and the rack in the present invention;

[0047] Figure 6 is Figure 5 enlarged view of portion A in

[0048] Figure 7 is Figure 5 enlarged view of portion B in

[0049] Figure 8 is Figure 5 enlarged view of portion C in

[0050] Figure 9 Schematic connection diagram of the rotating seat and the expansion wheel assembly in the present invention;

[0051] Figure 10 Connection diagram of the housing and the clamping block in the present invention.

[0052] In the figure: heat exchange tube body 1, tube sheet 2, base 3, first mounting plate 4, second mounting plate 5, first through hole 6, second through hole 7, rotating seat 8, first gear 9, second gear 10, rack 11, first spring 12, arc-shaped clamping plate 13, drive plate 14, drive groove 15, straight groove 1501, inclined groove 1502, connecting pin 16, annular shell 17, connecting cover 18, damping capsule 19, cavity 20, first air pipe 21, second air pipe 22, annular connecting plate 23, connecting rod 24, teeth 25, first motor 26, third gear 27, housing 28, sleeve 29, piston rod 30, clamping block 31, pulley 32, second spring 33, clamping groove 34, base 35, hydraulic cylinder 36, top seat 37, arc-shaped limiting plate 38, guide rail 39, second motor 40, lead screw 41, sliding rod 42. Detailed implementation manners

[0053] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and other obvious variations can be conceived by those skilled in the art.

[0054] As Figures 1 to 10 shown, an auxiliary tooling for welding the tube sheet of a heat exchanger includes:

[0055] Base 3, with a first mounting plate 4 and a second mounting plate 5 respectively arranged at both ends of the base 3. First through holes 6 and second through holes 7 adapted to the heat exchange tube body 1 are annularly arrayed on the surfaces of the first mounting plate 4 and the second mounting plate 5;

[0056] Two rotating seats 8, symmetrically distributed on both sides of the first through hole 6. The rotating seats 8 are fixedly connected to the left side wall of the first mounting plate 4;

[0057] An expansion wheel assembly, rotatably connected to the end of the rotating seat 8, and the expansion wheel assembly can contract and expand;

[0058] A first gear 9, coaxially fixed with the expansion wheel assembly;

[0059] A second gear 10, rotatably connected to the rotating seat 8, and the second gear 10 meshes with the first gear 9;

[0060] A rack 11, slidably penetrating through the first mounting plate 4, the rack 11 meshes with the second gear 10, and an elastic connecting piece is connected between the rack 11 and the first mounting plate 4;

[0061] Two arc-shaped clamping plates 13, slidably connected to the right side wall of the first mounting plate 4;

[0062] A driving plate 14, fixedly connected to the side wall of the arc-shaped clamping plate 13. A driving groove 15 is formed on the surface of the driving plate 14. The driving groove 15 has a straight groove 1501 and an inclined groove 1502. A connecting pin 16 is fixedly connected to the end of the rack 11, and the connecting pin 16 is slidably connected in the driving groove 15;

[0063] A positioning component, used to limit the rack 11 to position the rack 11 at a specified position;

[0064] Specifically, in the prior art, during the process of welding the tube sheet 2, it is necessary to insert the heat exchange tubes into the tube sheet 2 one by one, making it difficult to align and keep the ends of several heat exchange tubes flat, and manual adjustment is required. Moreover, during the welding process, the heat exchange tubes lack limitation, resulting in the heat exchange tubes being prone to shift during welding, thereby increasing the adjustment difficulty. This technical solution can solve the above problems. The specific operation is as follows: First, insert the heat exchange tube body 1 from any one of the second through holes 7 in the second mounting plate 5 until the heat exchange tube body 1 protrudes from the corresponding first through hole 6 in the first mounting plate 4. During the process of the heat exchange tube body 1 inserting into the first through hole 6, both sides of the heat exchange tube body 1 come into contact with and generate friction with the two expansion wheel assemblies at the corresponding positions, causing the expansion wheel assemblies to rotate, making the first gear 9 rotate. Under the meshing effect, the second gear 10 rotates. The second gear 10 drives the rack 11, causing the rack 11 to move to the left. During the process of the rack 11 moving to the left, the connecting pin 16 moves along the driving groove 15. The connecting pin 16 first moves along the straight groove 1501. At this time, the two arc-shaped clamping plates 13 stay in place and do not approach to clamp the heat exchange tube body 1, so that the end of the heat exchange tube body 1 passes through the first through hole 6 to the left and moves away from the first mounting plate 4. Subsequently, the connecting pin 16 moves along the inclined groove 1502. Driven by the inclined groove 1502, the two arc-shaped clamping plates 13 approach each other to clamp the side wall of the heat exchange tube body 1, hindering the heat exchange tube body 1 from continuing to move, so that the left end of the heat exchange tube body 1 moves to the specified position, which is beneficial to the ends of several heat exchange tube bodies 1 being located on the same plane and reducing the adjustment difficulty;

[0065] And by setting the positioning component, after the arc-shaped clamping plate 13 clamps the heat exchange tube body 1, the position of the rack 11 is positioned through the positioning component, so that the arc-shaped clamping plate 13 is limited, and it can stably clamp the heat exchange tube body 1, which is beneficial to reducing the phenomenon of the heat exchange tube body 1 shifting during the welding process, improving the welding stability while reducing the adjustment difficulty;

[0066] After the welding is completed, first contract the expansion wheel assembly to make the expansion wheel assembly away from the side wall of the heat exchange tube body 1. Subsequently, cancel the positioning effect of the positioning component on the rack 11. Under the action of the elastic connecting piece, the rack 11 resets. During the process of the rack 11 resetting and moving, driven by the inclined groove 1502, the two arc-shaped clamping plates 13 reset to cancel the clamping and limitation of the heat exchange tube body 1, so as to facilitate pulling out the heat exchange tube body 1 from the first through hole 6 and the second through hole 7.

[0067] The elastic connecting piece includes a first spring 12. The two ends of the first spring 12 are respectively fixedly connected to the side wall of the rack 11 and the first mounting plate 4.

[0068] It should be noted that: the radius of the first gear 9 is smaller than that of the second gear 10, and the radius of the annular shell 17 is not less than that of the second gear 10. For example, the annular shell 17 and the second gear 10 have the same radius. The second gear 10 is twice as large as the first gear 9. When the annular shell 17 rotates 2 circles, the first gear 9 rotates 2 circles and the second gear 10 rotates 1 circle. At this time, twice the circumference of the annular shell 17 is the distance that the heat exchange tube body 1 moves, while the rack 11 only moves one-half of the distance that the heat exchange tube body 1 moves. If the second gear 10 and the first gear 9 are the same, then the moving distance of the rack 11 will increase by 2 times, thereby slowing down the moving speed of the rack 11, and then making the two arc-shaped clamping plates 13 slowly approach and clamp the heat exchange tube body 1, so that the heat exchange tube body 1 has sufficient time to move, thus ensuring that the left end of the heat exchange tube body 1 can move to a farther distance.

[0069] As a further embodiment of the present invention, the expansion wheel assembly includes:

[0070] An annular shell 17, and a connection cover 18 is rotatably connected to the bottom end of the annular shell 17;

[0071] A damping capsule 19, the damping capsule 19 is fixedly connected to the outer side wall of the annular shell 17, and the damping capsule 19 communicates with the inside of the annular shell 17;

[0072] A pumping mechanism for injecting gas into the annular shell 17 to cause the damping capsule 19 to expand;

[0073] Specifically, by setting the damping capsule 19, the friction with the heat exchange tube is increased. Before inserting the heat exchange tube body 1, gas is first injected into the damping capsule 19 through the pumping mechanism, so that the damping capsule 19 expands, so that the damping capsule 19 contacts the side wall of the heat exchange tube body 1. When the heat exchange tube body 1 moves and contacts the damping capsule 19 to generate friction, the annular shell 17 rotates, so that the first gear 9 rotates. After the welding is completed, through the pumping mechanism, the gas in the annular shell 17 is extracted, so that the damping capsule 19 shrinks, so that the damping capsule 19 is away from the side wall of the heat exchange tube body 1. Subsequently, the positioning function of the positioning component on the rack 11 is cancelled, and under the action of the elastic connecting piece, the rack 11 is reset. During the reset movement of the rack 11, through the drive of the inclined groove 1502, the two arc-shaped clamping plates 13 are reset to cancel the clamping limit on the heat exchange tube body 1, so as to facilitate the heat exchange tube body 1 to be pulled out from the first through hole 6 and the second through hole 7.

[0074] As a further embodiment of the present invention, the pumping mechanism includes:

[0075] A cavity 20 is opened in the first mounting plate 4;

[0076] A first air pipe 21, one end of the first air pipe 21 is fixedly connected to the connection cover 18, and the other end of the first air pipe 21 is fixedly connected to the first mounting plate 4;

[0077] A second air pipe 22, one end of the second air pipe 22 is fixedly connected to the first mounting plate 4, and the other end is connected to an external air pump;

[0078] Specifically, by providing the first air pipe 21 and the second air pipe 22, it is conducive to the external air pump pumping gas into the second air pipe 22. The gas passes through the cavity 20 and is delivered to the first air pipes 21 at various positions. Through the first air pipes 21, the damping capsules 19 at various positions are inflated. After the welding is completed, similarly, the damping capsules 19 at various positions are contracted.

[0079] As a further embodiment of the present invention, a circular connecting plate 23 is rotatably connected to the outer side wall of the first mounting plate 4. The second air pipe 22 is fixedly connected to the circular connecting plate 23. The circular connecting plate 23 is fixedly connected to the base 3. The second mounting plate 5 is rotatably connected to the base 3. A plurality of connecting rods 24 are fixedly connected in a circular array on the right side wall of the first mounting plate 4. The other ends of the connecting rods 24 are fixedly connected to the side wall of the second mounting plate 5;

[0080] A plurality of teeth 25 are fixedly connected in a circular array on the outer side wall of the second mounting plate 5;

[0081] A first motor 26, a machine base is provided outside the first motor 26. The end of the output shaft of the first motor 26 is fixedly connected to a third gear 27. The third gear 27 meshes with the teeth 25;

[0082] Specifically, by providing the first motor 26 and the third gear 27, during the process of inserting the heat exchange tube body 1, the first motor 26 can be started to rotate the third gear 27, thereby driving the second mounting plate 5 and the first mounting plate 4 to rotate, so as to move the position where the heat exchange tube body 1 is not inserted to a specified position. On the one hand, it facilitates the insertion of the heat exchange tube body 1, and on the other hand, it facilitates adjusting the un-welded position to a specified position for welding.

[0083] As a further embodiment of the present invention, the positioning assembly includes:

[0084] A housing 28, the housing 28 is fixedly connected to the right side wall of the first mounting plate 4 corresponding to the position of the rack 11, and the housing 28 communicates with the cavity 20;

[0085] A sleeve 29, the sleeve 29 is fixedly communicated with the outer side wall of the housing 28. A piston rod 30 is slidably connected in the sleeve 29;

[0086] A clamping block 31, the clamping block 31 is slidably connected to the end of the piston rod 30. A second spring 33 is connected between the clamping block 31 and the piston rod 30;

[0087] A clamping groove 34 is opened on the side wall of the rack 11;

[0088] Specifically, by setting the housing 28 and the clamping block 31, during the process of injecting gas into the cavity 20 through the second air pipe 22, the piston rod 30 slides along the sleeve 29 under the action of air pressure, causing the second spring 33 to compress and generate elastic force. When the rack 11 moves to a specified position, under the action of the second spring 33, the clamping block 31 falls into the clamping groove 34, thereby positioning the rack 11. Subsequently, the arc-shaped clamping plate 13 is limited, and the heat exchange tube body 1 can be stably clamped, which is beneficial to reducing the phenomenon of the heat exchange tube body 1 shifting during the welding process and improving the welding stability;

[0089] During the process of the second exhaust pipe extracting the gas in the air cavity, the piston rod 30 pulls the clamping block 31, causing the clamping block 31 to disengage from the clamping groove 34. Under the action of the first spring 12, the rack 11 is reset.

[0090] Furthermore, the positioning assembly further includes:

[0091] A pulley 32, the pulley 32 is rotatably connected to the end of the clamping block 31, and the pulley 32 contacts the side wall of the rack 11 at the corresponding position;

[0092] Specifically, by setting the pulley 32, the damping between the clamping block 31 and the side wall of the rack 11 is reduced, so as to facilitate the normal movement of the rack 11.

[0093] As a further embodiment of the present invention, it further includes:

[0094] A base 35, a first semi-circular groove is opened at the top of the base 35. The base 35 is located on the left side of the first mounting plate 4, and hydraulic cylinders 36 are symmetrically and fixedly connected to the side wall of the base 35;

[0095] A top seat 37, the top seat 37 is slidably connected to the top of the base 35. The bottom end of the top seat 37 is fixedly connected to the telescopic rod of the hydraulic cylinder 36, and a second semi-circular groove is opened at the bottom end of the top seat 37;

[0096] An arc-shaped limiting plate 38, the arc-shaped limiting plate 38 is fixedly connected to the inner wall of the second semi-circular groove;

[0097] A linear driving mechanism, the linear driving mechanism is used to drive the base 35 to move linearly, so that the base 35 drives the tube sheet 2 to be welded to move to the right;

[0098] The linear driving mechanism includes:

[0099] Two guide rails 39, the two guide rails 39 are symmetrically and fixedly connected to both sides of the base 3;

[0100] A second motor 40, the second motor 40 is fixedly connected to the outer side wall of the guide rail 39;

[0101] The lead screw 41 has its two ends rotatably connected within the guide rail 39, and one end of the lead screw 41 is fixedly connected to the output shaft of the second motor 40;

[0102] The bottom end of the base 35 is threadedly connected to the surface of the lead screw 41, and a sliding rod 42 is fixedly connected to the side wall of the bottom end of the base 35. The sliding rod 42 penetrates through the inner wall of the base 3 and is slidably connected to the base 3;

[0103] Specifically, during the process of welding the tube sheet 2, first place the tube sheet 2 to be welded in the first semi-circular groove, and then start the hydraulic cylinder 36, so that the telescopic rod of the hydraulic cylinder 36 moves downward, causing the top seat 37 to move downward, making the inner wall of the second semi-circular groove contact the tube sheet 2, and by setting the arc-shaped limiting plate 38 to limit the tube sheet 2. Then start the second motor 40 to rotate the lead screw 41. Under the screw drive, the base 35 drives the tube sheet 2 to move to the right, so that the tube sheet 2 is connected to several heat exchange tube bodies 1;

[0104] After the welding is completed, through the second motor 40, the lead screw 41 is rotated. Under the screw drive, the base 35 drives the welded tube sheet 2 and the heat exchange tube body 1 to move to the left. Then, through the hydraulic cylinder 36, the top seat 37 is moved upward to cancel the limitation of the tube sheet 2. Finally, through an external conveying device, the welded tube sheet 2 is conveyed away.

[0105] Working principle of the present invention: During the process of welding the tube sheet 2, it is necessary to insert the heat exchange tubes into the tube sheet 2 one by one, making it difficult to align and keep the ends of several heat exchange tubes flat, and manual adjustment is required. Moreover, during the welding process, the heat exchange tubes lack limitation, resulting in the heat exchange tubes being prone to shift during welding, thereby increasing the adjustment difficulty. This technical solution can solve the above problems. The specific operation is as follows: First, insert the heat exchange tube body 1 from any one of the second through holes 7 in the second mounting plate 5 until the heat exchange tube body 1 protrudes from the corresponding first through hole 6 in the first mounting plate 4. During the process of the heat exchange tube body 1 inserting into the first through hole 6, both sides of the heat exchange tube body 1 come into contact with and generate friction with the two expansion wheel assemblies at the corresponding positions, causing the expansion wheel assemblies to rotate, making the first gear 9 rotate. Under the meshing effect, the second gear 10 rotates. The second gear 10 drives the rack 11, causing the rack 11 to move to the left. During the process of the rack 11 moving to the left, the connecting pin 16 moves along the driving groove 15. The connecting pin 16 first moves along the straight groove 1501. At this time, the two arc-shaped clamping plates 13 stay in place and do not approach to clamp the heat exchange tube body 1, so that the end of the heat exchange tube body 1 passes through the first through hole 6 to the left and moves away from the first mounting plate 4. Subsequently, the connecting pin 16 moves along the inclined groove 1502. Driven by the inclined groove 1502, the two arc-shaped clamping plates 13 approach each other to clamp the side wall of the heat exchange tube body 1, hindering the heat exchange tube body 1 from continuing to move, so that the left end of the heat exchange tube body 1 moves to the specified position, which is beneficial to making the ends of several heat exchange tube bodies 1 be located on the same plane and reducing the adjustment difficulty;

[0106] And by setting the positioning component, after the arc-shaped clamping plate 13 clamps the heat exchange tube body 1, the position of the rack 11 is positioned through the positioning component, so that the arc-shaped clamping plate 13 is limited and can stably clamp the heat exchange tube body 1, which is beneficial to reducing the phenomenon of the heat exchange tube body 1 shifting during welding, improving the welding stability while reducing the adjustment difficulty;

[0107] After welding is completed, first make the expansion wheel assembly contract, so that the expansion wheel assembly moves away from the side wall of the heat exchange tube body 1. Subsequently, cancel the positioning effect of the positioning component on the rack 11. Under the action of the elastic connecting piece, the rack 11 resets. During the process of the rack 11 resetting and moving, driven by the inclined groove 1502, the two arc-shaped clamping plates 13 reset to cancel the clamping and limitation of the heat exchange tube body 1, so as to facilitate pulling out the heat exchange tube body 1 from the first through hole 6 and the second through hole 7.

[0108] 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 by the above embodiments, and what is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, various changes and improvements will occur to the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. An auxiliary tooling for welding a heat exchanger tube sheet, characterized in that, Comprising: A base (3), with a first mounting disk (4) and a second mounting disk (5) respectively arranged at both ends of the base (3). First through holes (6) and second through holes (7) adapted to the heat exchange tube body (1) are respectively arranged in a circular array on the surfaces of the first mounting disk (4) and the second mounting disk (5); On both sides of each first through hole (6), two symmetric rotating seats (8) are arranged, and the rotating seats (8) are fixedly connected to the left side wall of the first mounting disk (4); An expansion wheel assembly, which is rotatably connected to the end of the rotating seat (8), and the expansion wheel assembly can contract and expand; A first gear (9), which is coaxially fixed with the expansion wheel assembly; A second gear (10), which is rotatably connected to the rotating seat (8), and the second gear (10) meshes with the first gear (9); A rack (11), which slidably penetrates through the first mounting disk (4), the rack (11) meshes with the second gear (10), and an elastic connecting piece is connected between the rack (11) and the first mounting disk (4); Two arc-shaped clamping plates (13), which are slidably connected to the right side wall of the first mounting disk (4); A driving plate (14), which is fixedly connected to the side wall of the arc-shaped clamping plate (13). A driving groove (15) is arranged on the surface of the driving plate (14). The driving groove (15) has a straight groove (1501) and an inclined groove (1502). A connecting pin (16) is fixedly connected to the end of the rack (11), and the connecting pin (16) is slidably connected in the driving groove (15). During the process of the connecting pin (16) moving along the straight groove (1501), the two arc-shaped clamping plates (13) stay in place. During the process of the connecting pin (16) moving along the inclined groove (1502), the two arc-shaped clamping plates (13) approach each other to clamp the side wall of the heat exchange tube body (1) to prevent the heat exchange tube body (1) from continuing to move; A positioning component, which is used to limit the rack (11) to position the rack (11) at a specified position; The expansion wheel assembly includes: An annular shell (17), with a connecting cover (18) rotatably connected to the bottom end of the annular shell (17); A damping capsule (19), which is fixedly connected to the outer side wall of the annular shell (17), and the damping capsule (19) is communicated with the inside of the annular shell (17); A pumping mechanism, which is used to inject gas into the annular shell (17) to make the damping capsule (19) expand; During the movement of the heat exchange tube body (1), it will contact and generate friction with the damping capsule (19) to drive the annular shell (17) to rotate and make the first gear (9) rotate.

2. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 1, characterized in that, The pumping mechanism includes: A cavity (20), which is arranged in the first mounting disk (4); A first air pipe (21), one end of the first air pipe (21) is fixedly connected to the connecting cover (18), and the other end of the first air pipe (21) is fixedly connected to the first mounting disk (4); The second trachea (22), one end of the second trachea (22) is fixedly connected to the first mounting plate (4), and the other end is connected to an external air pump.

3. The auxiliary tooling for the welding of a heat exchanger tube sheet according to claim 2, characterized in that, A circular connecting plate (23) is rotatably connected to the outer side wall of the first mounting plate (4). The second trachea (22) is fixedly connected to the circular connecting plate (23). The circular connecting plate (23) is fixedly connected to the base (3). The second mounting plate (5) is rotatably connected to the base (3). A plurality of connecting rods (24) are fixedly connected in a circular array on the right side wall of the first mounting plate (4). The other ends of the connecting rods (24) are fixedly connected to the side wall of the second mounting plate (5); A plurality of teeth (25) are fixedly connected in a circular array on the outer side wall of the second mounting plate (5); A first motor (26), a machine base is arranged outside the first motor (26). The end of the output shaft of the first motor (26) is fixedly connected to a third gear (27). The third gear (27) meshes with the teeth (25).

4. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 3, characterized in that, The positioning assembly includes: A housing (28), the housing (28) is fixedly connected to the right side wall of the first mounting plate (4) corresponding to the position of the rack (11). The housing (28) communicates with the air chamber; A sleeve (29), the sleeve (29) is fixedly connected to the outer side wall of the housing (28). A piston rod (30) is slidably connected in the sleeve (29); A clamping block (31), the clamping block (31) is slidably connected to the end of the piston rod (30). A second spring (33) is connected between the clamping block (31) and the piston rod (30); A clamping groove (34) is opened on the side wall of the rack (11).

5. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 1, characterized in that, It further includes: A base (35), a first semi-circular groove is opened at the top end of the base (35). The base (35) is located on the left side of the first mounting plate (4). Hydraulic cylinders (36) are symmetrically fixedly connected to the side wall of the base (35); A top seat (37), the top seat (37) is slidably connected to the top end of the base (35). The bottom end of the top seat (37) is fixedly connected to the telescopic rod of the hydraulic cylinder (36). A second semi-circular groove is opened at the bottom end of the top seat (37); An arc-shaped limiting plate (38) is fixedly connected to the inner wall of the second semi-circular groove; A linear driving mechanism is used to drive the base (35) to move linearly, so that the base (35) drives the tube sheet (2) to be welded to move to the right.

6. The auxiliary tooling for the welding of a heat exchanger tube sheet according to claim 5, characterized in that, The linear driving mechanism includes: Two guide rails (39), the two guide rails (39) are symmetrically fixedly connected to both sides of the base (3); A second motor (40), the second motor (40) is fixedly connected to the outer side wall of the guide rail (39); A lead screw (41), the two ends of the lead screw (41) are rotatably connected in the guide rail (39). One end of the lead screw (41) is fixedly connected to the output shaft of the second motor (40); The bottom end of the base (35) is threadedly connected to the surface of the lead screw (41). A sliding rod (42) is fixedly connected to the side wall of the bottom end of the base (35). The sliding rod (42) penetrates through the inner wall of the base (3) and is slidably connected to the base (3).

7. An auxiliary tooling for welding a heat exchanger tube sheet according to claim 1, characterized in that, The elastic connection member includes a first spring (12). The two ends of the first spring (12) are respectively fixedly connected to the side walls of the rack (11) and the first mounting plate (4).

8. An auxiliary tooling for welding a heat exchanger tube sheet according to claim 4, characterized in that, The positioning assembly further includes: A pulley (32). The pulley (32) is rotatably connected to the end of the clamping block (31). The pulley (32) contacts the side wall of the rack (11) at the corresponding position.

9. The auxiliary tooling for welding a heat exchanger tube sheet according to claim 1, characterized in that, The radius of the first gear (9) is smaller than the radius of the second gear (10).

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