A welding tool for finned tube processing

Abstract

The present application relates to the field of finned tube processing, and discloses a welding tool for finned tube processing, which comprises a workbench, an external welding structure arranged at the middle of the workbench, two connecting blocks connected to the back of the workbench, a vertical plate arranged on the back side of the connecting block, two horizontal rods arranged on the vertical plate through a driving structure, a first insertion rod and a second insertion rod arranged on the two horizontal rods through a first transmission structure respectively, an internal welding structure arranged at one end of the first insertion rod, a second transmission structure arranged at the middle of the front side of the vertical plate, a support seat fastened to the left and right sides of the upper surface of the workbench through screws, a placing seat installed on the upper surface of the support seat, and a pressing and limiting structure arranged on the placing seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of finned tube processing, in particular to a welding tool for finned tube processing. BACKGROUND

[0002] The automobile finned tube is the core heat exchange element in the automobile air conditioning system, and is mainly used for strengthening the air side heat exchange efficiency. The structure is formed by mechanically rolling low fins on the outer surface of the light tube to form a seamless whole structure, which significantly expands the heat transfer area and reduces the contact thermal resistance. The automobile finned tube is processed using a welding tool;

[0003] The welding tool in the prior art generally places and fixes two finned tubes on the placing seat, and welds between the two finned tubes by rotating the welding gun. However, in the actual operation process, the welding tool in the prior art only performs welding work on the outer side of the two finned tubes, which leads to the need to improve the firmness of the welding between the finned tubes. The firmness of the welding between the finned tubes is related to the production quality of the automobile, and therefore there is room for improvement. SUMMARY

[0004] In order to solve the problems in the background art, the present application provides a welding tool for finned tube processing.

[0005] The welding tool for finned tube processing provided by the present application adopts the following technical scheme:

[0006] A welding tool for finned tube processing, comprising a workbench, an external welding structure is arranged at the middle of the workbench, two connecting blocks are connected to the back of the workbench, a vertical plate is arranged on the back side of the connecting block, two horizontal rods are arranged on the vertical plate through a driving structure, a first insertion rod and a second insertion rod are arranged on the two horizontal rods through a first transmission structure respectively, an internal welding structure is arranged at one end of the first insertion rod, a second transmission structure is arranged at the middle of the front side of the vertical plate, support seats are fastened on the left and right sides of the upper surface of the workbench through screws, a placing seat is installed on the upper surface of the support seat, and a pressing and limiting structure is arranged on the placing seat.

[0007] The external welding structure comprises a middle groove opened at the middle of the upper surface of the workbench, support plates are connected to the inner walls of the front and rear sides of the middle groove, fixed rings are installed and fixed at the top ends of the two support plates, a rotating ring is rotatably arranged on the inner wall of the fixed ring, and two external welding guns are installed on the inner wall of the rotating ring along the radial direction thereof.

[0008] The internal welding structure comprises an end sleeve fixedly sleeved on one end of the first inserting rod, the first inserting rod and the second inserting rod are provided with abutting limiting structures at the ends away from each other, a first fixing ring is fixedly sleeved on the end sleeve, two internal welding guns are installed on the first fixing ring in the radial direction thereof, the first inserting rod and the second inserting rod are provided with scrapers at the ends close to each other, and the end sleeve and the second inserting rod are provided with cleaning structures.

[0009] Preferably, the scrapers comprise scrapers fixedly arranged at the ends of the first inserting rod and the second inserting rod, and the scrapers are attached to the inner walls of the finned pipes.

[0010] Preferably, the cleaning structures comprise a second fixing ring fixedly sleeved on the end sleeve and the second inserting rod, a plurality of cleaning blocks are connected to the side surface of the second fixing ring, each of the cleaning blocks is provided with bristles, a blocking frame is arranged on the end sleeve between the second fixing ring and the first fixing ring, and a blocking net is installed on the blocking frame.

[0011] Preferably, the driving structure comprises a through groove formed in the vertical plate, a bidirectional screw rod is rotatably connected between the groove walls at the two ends of the through groove, the threads on the left and right sections of the bidirectional screw rod are opposite in direction, two moving blocks are sleeved on the bidirectional screw rod, a fixed block is connected to the front side surface of each moving block, a rotating cylinder is rotatably arranged at the middle of the fixed block, the horizontal rod is fixedly arranged through the rotating cylinder, a U-shaped plate is connected to the upper surface of the fixed block, the horizontal rod is rotatably arranged through the U-shaped plate, an L-shaped plate is connected to the side surface of the U-shaped plate away from the fixed block, one end of the L-shaped plate is connected to the side plate, the horizontal rod is rotatably arranged through the side plate, the first inserting rod and the second inserting rod are rotatably arranged through the two side plates respectively, a first motor is installed on one side surface of the vertical plate, and one end of the output shaft of the first motor is connected to the bidirectional screw rod.

[0012] Preferably, the first transmission structure comprises a first belt pulley sleeved on one end of the horizontal rod away from the fixed block, a second belt pulley is sleeved on each end of the first inserting rod and the second inserting rod away from each other, and a belt is tightly sleeved between the first belt pulley and the second belt pulley.

[0013] Preferably, the second transmission structure comprises a fixed frame fastened to the middle of the front side surface of the vertical plate by means of bolts, a first rotating shaft is rotatably arranged through the fixed frame, a first gear is fixedly sleeved on the first rotating shaft, a second motor is installed on one side surface of the fixed frame, a second gear is sleeved on one end of the output shaft of the second motor inserted into the fixed frame, the second gear is meshingly connected with the first gear, rotating plates are connected to the two ends of the first rotating shaft, the end surfaces of the rotating plates are square-shaped, the rotating plates are movably inserted into the insertion grooves formed in the end surfaces of the horizontal rod, and a third transmission structure is arranged between the first gear and the rotating ring.

[0014] Preferably, the third transmission structure comprises a vertical frame fastened on the workbench by screws, a second rotating shaft rotatably penetrating the vertical frame near the top end, a fourth gear fixedly sleeved on the middle of the second rotating shaft, the fourth gear being in meshing connection with the first gear, third gears sleeved on both ends of the second rotating shaft, and toothed rings fixedly sleeved on both ends of the rotating ring, the teeth of the toothed rings being in meshing connection with the third gears.

[0015] Preferably, the abutting limiting structure comprises a screw sleeve fixedly sleeved on the mutually faraway ends of the first and second insertion rods, a screw sleeve sleeved on the screw sleeve, a moving ring rotatably mounted on one end of the screw sleeve, a plurality of connecting rods connected to the side surface of the moving ring, an abutting cover mounted on one end of the connecting rods, and a plurality of limiting blocks arranged on the inner wall of the abutting cover, the first and second insertion rods being provided with limiting grooves for the limiting blocks to movably insert.

[0016] Preferably, the pressing limiting structure comprises a pressing frame rotatably mounted on the placing seat, a U-shaped block arranged on the rear side surface of the placing seat, the pressing frame being inserted into the U-shaped block, and a positioning pin movably penetrating the pressing frame and the U-shaped block.

[0017] To sum up, the present application has the following beneficial technical effects:

[0018] 1. The internal and external welding structures are arranged, welding between two finned pipes can be carried out from the inside and outside of the finned pipes at the same time, the welding between the finned pipes is more firm, and the service life of the finned pipes is prolonged.

[0019] 2. The driving structure is arranged, the first and second insertion rods can be moved, the internal welding gun on the first insertion rod can be moved into the finned pipe for internal welding, when the tool is not used, the first and second insertion rods can be moved towards the middle, the occupying space of the tool is reduced, and storage is facilitated.

[0020] 3. The first, second and third transmission structures are arranged, under the action of the second transmission structure, the first and second insertion rods can be rotated by the first and third transmission structures, and the rotating ring can be rotated, the internal and external welding guns can be automatically rotated for rotary welding, the finned pipe can be comprehensively welded, and the welding quality is improved.

[0021] 4. The cleaning and scrap removing structures are arranged, the finned pipe inner wall after welding can be automatically cleaned by the cleaning structure during the moving-out process of the first and second insertion rods, and the impurities in the cleaning position of the finned pipe can be brought out by the scrap removing structure, and the cleaning work of the finned pipe is facilitated.

[0022] 5、The present application sets up abutting limiting structure and pressing limiting structure, first insertion rod and second insertion rod can drive abutting limiting structure to abut to the end of finned tube after inserting into finned tube, abutting limiting of finned tube during welding is carried out, the problem of position deviation of finned tube during welding process is avoided; the setting of pressing limiting structure can carry out pressing limiting work of finned tube after moving out first insertion rod and second insertion rod, the problem of finned tube being taken from placing seat directly due to the moving of scrap structure close to finned tube inner wall and taking out impurities is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure schematic view of a welding tool for finned tube processing in the embodiment of the present application;

[0024] Figure 2 is a structure schematic view of the workbench in the embodiment of the present application;

[0025] Figure 3 is an enlarged view of structure A of the present application in the embodiment Figure 1 ;

[0026] Figure 4 is a structure schematic view of the vertical plate in the embodiment of the present application;

[0027] Figure 5 is an enlarged view of structure B of the present application in the embodiment Figure 4 ;

[0028] Figure 6 is a structure schematic view of the rear side of vertical plate in the embodiment of the present application;

[0029] Figure 7 is a structure schematic view of outer welding structure in the embodiment of the present application;

[0030] Figure 8 is a structure schematic view of first insertion rod and second insertion rod in the embodiment of the present application;

[0031] Figure 9 is an enlarged view of structure C of the present application in the embodiment Figure 8 .

[0032] Explanation of reference signs: 1, workbench; 2, support seat; 3, placing seat; 4, middle groove; 5, support plate; 6, fixed ring; 7, rotating ring; 8, outer welding gun; 9, connecting block; 10, vertical plate; 11, cross bar; 13, first insertion rod; 14, second insertion rod; 15, first fixed ring; 16, inner welding gun; 17, scraper disc; 18, collection frame; 19, second fixed ring; 20, cleaning block; 21, brush; 22, blocking frame; 23, blocking net; 24, end sleeve; 25, through groove; 26, first motor; 27, bidirectional screw; 28, moving block; 29, fixed block; 30, U-shaped plate; 31, fixed frame; 32, first rotating shaft; 33, first gear; 34, rotating plate; 35, rotating cylinder; 36, second motor; 37, first belt pulley; 38, belt; 39, second belt pulley; 40, vertical frame; 41, second rotating shaft; 42, third gear; 43, fourth gear; 44, gear ring; 45, screw cylinder; 46, screw sleeve; 47, moving ring; 48, connecting rod; 49, limiting groove; 50, limiting block; 51, abutting cover; 52, pressing frame; 53, U-shaped block; 54, positioning pin; 55, L-shaped plate. DETAILED DESCRIPTION

[0033] The following will be described in detail below Figures 1-9 The application will be further described in detail.

[0034] Reference Figures 1-9 The embodiment of the application discloses a welding tool for finned tube processing, which comprises a workbench 1, wherein an external welding structure is arranged at the middle of the workbench 1, two connecting blocks 9 are connected to the back of the workbench 1, a vertical plate 10 is arranged on the back side of the connecting block 9, two cross bars 11 are arranged on the vertical plate 10 through driving structure, a first insertion rod 13 and a second insertion rod 14 are arranged on the two cross bars 11 through first transmission structure respectively, an internal welding structure is arranged at one end of the first insertion rod 13, a second transmission structure is arranged at the middle of the front side of the vertical plate 10, support seats 2 are fastened on the left and right sides of the upper surface of the workbench 1 through screws, placing seats 3 are installed on the upper surfaces of the support seats 2, and pressing and limiting structures are arranged on the placing seats 3;

[0035] The external welding structure comprises a middle groove 4 arranged in the middle of the upper surface of the workbench 1, support plates 5 connected to the inner walls of the front and back sides of the middle groove 4, fixed rings 6 installed at the top ends of the two support plates 5, rotating rings 7 rotatably arranged on the inner walls of the fixed rings 6, and two outer welding guns 8 installed on the inner walls of the rotating rings 7 along the radial directions of the rotating rings 7;

[0036] The internal welding structure comprises an end sleeve 24 fixedly sleeved on one end of the first inserting rod 13, the first inserting rod 13 and the second inserting rod 14 are respectively provided with abutting limiting structures at the distal ends thereof, the end sleeve 24 is fixedly sleeved with a first fixing ring 15, two internal welding guns 16 are installed on the first fixing ring 15 in the radial direction thereof, the first inserting rod 13 and the second inserting rod 14 are respectively provided with scrapers at the proximal ends thereof, the end sleeve 24 and the second inserting rod 14 are respectively provided with cleaning structures, after the two finned tubes are placed in the two placing seats 3, the first inserting rod 13 and the second inserting rod 14 can be inserted into the finned tubes, the first inserting rod 13 drives the internal welding gun 16 to move into the finned tube, during welding, the external welding gun 8 is used to weld outside the finned tube, and the internal welding gun 16 is used to weld inside the finned tube, so that the firmness of the finned tube welding is greatly improved, and the welding quality is improved.

[0037] Referring to Figure 1 、 Figure 4 、 Figure 8 and Figure 9 , the scrapers comprise scrapers 17 fixedly arranged on one end of the first inserting rod 13 and the second inserting rod 14, the scrapers 17 are attached to the inner wall of the finned tube, and the workbench 1 is provided with a collecting frame 18;

[0038] The cleaning structure comprises a second fixing ring 19 fixedly sleeved on the end sleeve 24 and the second inserting rod 14, a plurality of cleaning blocks 20 are connected to the side surface of the second fixing ring 19, each cleaning block 20 is provided with brush hairs 21, a blocking frame 22 is arranged on the end sleeve 24 between the second fixing ring 19 and the first fixing ring 15, and a blocking net 23 is installed on the blocking frame 22;

[0039] The driving structure comprises a through groove 25 formed on the vertical plate 10, a bidirectional screw rod 27 rotatably connected between the groove walls at both ends of the through groove 25, opposite threads on the left and right sections of the bidirectional screw rod 27, two moving blocks 28 sleeved on the bidirectional screw rod 27, a fixed block 29 connected to the front side of each moving block 28, a rotating drum 35 rotatably penetrated through the middle of the fixed block 29, a horizontal rod 11 fixedly penetrated through the rotating drum 35, a U-shaped plate 30 connected to the upper surface of the fixed block 29, the horizontal rod 11 rotatably penetrated through the U-shaped plate 30, an L-shaped plate 55 connected to the side of the U-shaped plate 30 away from the fixed block 29, the L-shaped plate 55 connected to one end of the side plate 12, the horizontal rod 11 rotatably penetrated through the side plate 12, the first insertion rod 13 and the second insertion rod 14 rotatably penetrated through the two side plates 12, respectively, the first motor 26 mounted on one side of the vertical plate 10, and the output shaft of the first motor 26 connected to one end of the bidirectional screw rod 27. When the first motor 26 on the vertical plate 10 is started to drive the bidirectional screw rod 27 to rotate, the two moving blocks 28 are synchronously rotated in opposite directions on the rotating bidirectional screw rod 27 due to the threaded grooves formed on the moving blocks 28 for the bidirectional screw rod 27 to penetrate, so that the first insertion rod 13 and the second insertion rod 14 can be automatically inserted into the finned tube for welding work. When the first insertion rod 13 and the second insertion rod 14 move, the bristles 21 on the cleaning block 20 can clean the impurities in the finned tube and the debris generated during the welding process. At the same time, the cleaned impurities can be brought out of the finned tube along with the movement of the scraper 17 and discharged into the collection frame 18 for collection and centralized treatment.

[0040] Referring to Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the first transmission structure comprises a first belt pulley 37 sleeved on one end of the horizontal rod 11 away from the fixed block 29, and the first insertion rod 13 and the second insertion rod 14 are sleeved with a second belt pulley 39 on the ends away from each other, and the first belt pulley 37 and the second belt pulley 39 are sleeved with a belt 38.

[0041] The second transmission structure comprises a fixed frame 31 fastened on the middle of the front side of the vertical plate 10 by bolts, a first rotating shaft 32 rotatably penetrated through the fixed frame 31, a first gear 33 fixedly sleeved on the first rotating shaft 32, a second motor 36 mounted on one side of the fixed frame 31, a second gear sleeved on one end of the output shaft of the second motor 36 inserted into the fixed frame 31, the second gear meshingly connected with the first gear 33, and a rotating plate 34 connected to both ends of the first rotating shaft 32, the end surface of the rotating plate 34 being square-shaped, the rotating plate 34 movably inserted into the insertion slot formed on the end surface of the horizontal rod 11, and the third transmission structure arranged between the first gear 33 and the rotating ring 7.

[0042] The third transmission structure comprises a vertical frame 40 fastened on the workbench 1 by screws, a second rotating shaft 41 rotatably penetrating the vertical frame 40 near the top end, a fourth gear 43 fixedly sleeved on the middle of the second rotating shaft 41, the fourth gear 43 being in meshing connection with the first gear 33, third gears 42 sleeved on both ends of the second rotating shaft 41, toothed rings 44 fixedly sleeved on both ends of the rotating ring 7, the teeth of the toothed rings 44 being in meshing connection with the third gears 42, and the second motor 36 being started on the fixed frame 31 during welding or cleaning, the first rotating shaft 32 being driven to rotate through the second gear and the first gear 33, the horizontal rod 11 being driven to rotate through the rotating plate 34, and the first insertion rod 13 and the second insertion rod 14 being driven to rotate as a whole through the two groups of belts 38, the first belt pulley 37 and the second belt pulley 39, so that the functions of rotary welding and rotary cleaning are automatically realized.

[0043] Referring to Figures 1-3 The abutting limiting structure comprises a screw cylinder 45 fixedly sleeved on the ends of the first insertion rod 13 and the second insertion rod 14 away from each other, a screw sleeve 46 sleeved on the screw cylinder 45, a moving ring 47 rotatably installed at one end of the screw sleeve 46, a plurality of connecting rods 48 connected to the side surface of the moving ring 47, an abutting cover 51 installed at one end of the connecting rods 48, a plurality of limiting blocks 50 arranged on the inner wall of the abutting cover 51, and limiting grooves 49 formed in the first insertion rod 13 and the second insertion rod 14 for the limiting blocks 50 to movably insert into the limiting grooves 49.

[0044] The pressing limiting structure comprises a pressing frame 52 rotatably installed on the placing seat 3, a U-shaped block 53 arranged on the rear side surface of the placing seat 3, the pressing frame 52 being inserted into the U-shaped block 53, a positioning pin 54 movably penetrating the pressing frame 52 and the U-shaped block 53, the first insertion rod 13 and the second insertion rod 14 being inserted into the finned tubes, the abutting cover 51 being driven to move and abut against the ends of the two finned tubes for abutting limiting, displacement of the finned tubes being avoided during welding, the position of the abutting cover 51 being flexibly adjusted according to the length of the finned tubes when the screw sleeve 46 is rotated on the screw cylinder 45 in cooperation with the limiting action of the limiting blocks 50, and the finned tubes being pressed by the pressing frame 52 after welding, so that the impurities in the cleaning part of the finned tubes and the debris generated during the welding process can be smoothly taken out by the scraper 17 during the process of moving out the scraper 17, the movement of the scraper 17 being avoided, and the finned tubes being directly taken out from the placing seat 3.

[0045] The implementation principle of the welding tool for finned tube processing is as follows: first, two finned tubes to be welded are respectively placed into two placing seats 3, and the two finned tube end portions are abutted in the rotating ring 7; then, the first motor 26 is started to drive the bidirectional screw rod 27 to rotate, the two moving blocks 28 drive the two cross rods 11 to synchronously move towards each other, thereby driving the first insertion rod 13 and the second insertion rod 14 to move and insert into the finned tubes; when the inner welding gun 16 on the first insertion rod 13 moves to the welding position between the two finned tubes, the abutting cover 51 on the first insertion rod 13 and the second insertion rod 14 is abutted to one end of the finned tube to abut and limit the two finned tubes; then, the pressing frame 52 is tightly covered on the placing seat 3, the pressing frame 52 is pressed to the finned tube, and the positioning pin 54 is passed through the pressing frame 52 and the U-shaped block 53 to limit the pressing frame 52 on the placing seat 3; then, during welding, the second motor 36 on the fixed frame 31 is started, the first rotating shaft 32 is driven to rotate through the second gear and the first gear 33, the two cross rods 11 are driven to rotate through the rotating plate 34, and the first insertion rod 13 and the second insertion rod 14 are driven to rotate through the two groups of first belt pulleys 37, belts 38 and second belt pulleys 39; at the same time, the second rotating shaft 41 and the third gear 42 are driven to rotate as a whole through the first gear 33 and the fourth gear 43, and the third gear 42 drives the gear ring 44 and the rotating ring 7 to rotate, so that the inner welding gun 16 and the outer welding gun 8 can be simultaneously driven to rotate, and automatic rotary welding is performed inside and outside the finned tube, which greatly improves the welding work efficiency; during the welding process, the metal-made blocking net 23 on the blocking frame 22 shields the debris generated during the welding process, avoids that the high-temperature debris burns the bristles 21 and affects the normal use of the bristles 21, after the welding, the second motor 36 continues to work, the first insertion rod 13 and the second insertion rod 14 continue to rotate, and the first motor 26 drives the bidirectional screw rod 27 to reversely rotate, the first insertion rod 13 and the second insertion rod 14 are gradually moved out of the finned tube, and the two groups of bristles 21 are driven to rotate, thereby performing automatic cleaning work inside the finned tube; at the same time, the scraper disc 17 is driven to move, the impurities in the finned tube and the debris generated during the welding process are taken out of the finned tube and discharged into the collecting frame 18 for collection, so that the welding work of the finned tube can be realized.

[0046] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, and therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A welding tool for finned tube processing, comprising a worktable (1), characterized in that: The workbench (1) is provided with an external welding structure in the middle, two connecting blocks (9) are connected to the back of the workbench (1), a vertical plate (10) is arranged on the back side of the connecting block (9), two horizontal rods (11) are arranged on the vertical plate (10) through a driving structure, a first insertion rod (13) and a second insertion rod (14) are arranged on the two horizontal rods (11) respectively through a first transmission structure, an internal welding structure is arranged at one end of the first insertion rod (13), a second transmission structure is arranged at the middle of the front side of the vertical plate (10), support seats (2) are fastened on the upper surface of the workbench (1) on the left and right sides, and a placing seat (3) is installed on the upper surface of the support seat (2), and a pressing and limiting structure is arranged on the placing seat (3); The external welding structure comprises a middle groove (4) opened in the middle of the upper surface of the workbench (1), support plates (5) are connected to the inner walls of the front and rear sides of the middle groove (4), and fixed rings (6) are installed and fixed at the top ends of the two support plates (5); a rotating ring (7) is rotatably arranged on the inner wall of the fixed ring (6); and two external welding guns (8) are installed on the inner wall of the rotating ring (7) along the radial direction thereof; The internal welding structure comprises an end sleeve (24) fixedly sleeved on one end of the first insertion rod (13), abutting limiting structures are arranged at the ends of the first insertion rod (13) and the second insertion rod (14) away from each other, a first fixed ring (15) is fixedly sleeved on the end sleeve (24), two internal welding guns (16) are installed on the first fixed ring (15) along the radial direction thereof, scrap removing structures are arranged at the ends of the first insertion rod (13) and the second insertion rod (14) close to each other, and cleaning structures are arranged on the end sleeve (24) and the second insertion rod (14); The driving structure comprises a through groove (25) opened in the vertical plate (10), a bidirectional screw (27) is rotatably connected between the groove walls at the two ends of the through groove (25), the threads on the left and right sections of the bidirectional screw (27) are opposite in direction, two moving blocks (28) are sleeved on the bidirectional screw (27), a fixed block (29) is connected to the front side of each moving block (28), a rotating cylinder (35) penetrates the middle of the fixed block (29) in a rotating manner, the horizontal rod (11) is fixedly penetrated through the rotating cylinder (35), a U-shaped plate (30) is connected to the upper surface of the fixed block (29), the horizontal rod (11) is rotatably penetrated through the U-shaped plate (30), an L-shaped plate (55) is connected to the side surface of the U-shaped plate (30) away from the fixed block (29), one end of the L-shaped plate (55) is connected to a side plate (12), the horizontal rod (11) is rotatably penetrated through the side plate (12), the first insertion rod (13) and the second insertion rod (14) are rotatably penetrated through the two side plates (12) respectively, and a first motor (26) is installed on one side surface of the vertical plate (10), and one end of the output shaft of the first motor (26) is connected with the bidirectional screw (27). The first transmission structure comprises a first belt pulley (37) sleeved on the cross rod (11) away from the fixed block (29), the first insertion rod (13) and the second insertion rod (14) are sleeved with a second belt pulley (39) at the distal end, and the first belt pulley (37) and the second belt pulley (39) are sleeved with a belt (38). The second transmission structure comprises a fixed frame (31) fastened on the front side of the vertical plate (10) by bolts, a first rotating shaft (32) is rotatably arranged on the fixed frame (31), a first gear (33) is fixedly sleeved on the first rotating shaft (32), a second motor (36) is installed on one side of the fixed frame (31), a second gear is sleeved on the end of the output shaft of the second motor (36) inserted into the fixed frame (31), the second gear is in meshing connection with the first gear (33), and rotating plates (34) are connected to both ends of the first rotating shaft (32). The third transmission structure comprises a vertical frame (40) fastened on the workbench (1) by screws, a second rotating shaft (41) is rotatably arranged on the vertical frame (40) near the top end, a fourth gear (43) is fixedly sleeved on the second rotating shaft (41) at the middle, the fourth gear (43) is in meshing connection with the first gear (33), third gears (42) are sleeved on both ends of the second rotating shaft (41), and toothed rings (44) are fixedly sleeved on both ends of the rotating ring (7).

2. The welding tool for fin-and-tube processing according to claim 1, characterized by: The scrap removing structure comprises a scraping disc (17) fixedly arranged on one end of the first insertion rod (13) and the second insertion rod (14), the scraping disc (17) is attached to the inner wall of the finned tube, and the workbench (1) is provided with a collecting frame (18).

3. The welding tool for fin-and-tube processing according to claim 1, characterized by: The cleaning structure comprises a second fixed ring (19) fixedly sleeved on the end sleeve (24) and the second insertion rod (14), a plurality of cleaning blocks (20) are connected to the side surface of the second fixed ring (19), each cleaning block (20) is provided with a plurality of bristles (21), a blocking frame (22) is arranged between the second fixed ring (19) and the first fixed ring (15) on the end sleeve (24), and a blocking net (23) is installed on the blocking frame (22).

4. The welding tool for fin-and-tube processing according to claim 1, characterized by: The abutting limiting structure comprises a screw cylinder (45) fixedly sleeved on the distal ends of the first insertion rod (13) and the second insertion rod (14), a screw sleeve (46) is sleeved on the screw cylinder (45), a moving ring (47) is rotatably installed at one end of the screw sleeve (46), a plurality of connecting rods (48) are connected to the side surface of the moving ring (47), an abutting cover (51) is installed at one end of the connecting rod (48), a plurality of limiting blocks (50) are arranged on the inner wall of the abutting cover (51), and a limiting groove (49) is formed in the first insertion rod (13) and the second insertion rod (14) for the limiting blocks (50) to be movably inserted.

5. The welding tool for fin-and-tube processing according to claim 1, characterized by: The pressing limiting structure comprises a pressing frame (52) rotatably installed on the placing seat (3), a U-shaped block (53) is arranged on the rear side of the placing seat (3), the pressing frame (52) is inserted into the U-shaped block (53), and a positioning pin (54) movably passes through the pressing frame (52) and the U-shaped block (53).

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