Mechanical automatic welding device and welding method thereof

Abstract

The invention discloses a mechanical automatic welding device and a welding method.The mechanical automatic welding device comprises a material conveying table, a partition plate is fixedly installed in the middle of the material conveying table, and conveying rollers are fixedly installed at the positions, corresponding to the two sides of the partition plate, in the material conveying table at equal intervals; through operation of a feeding motor, meshing of a second gear and a first gear and meshing of a third gear and a second gear, a first material pushing plate and a second material pushing plate are driven to rotate synchronously, two pipe fittings with different diameters can be conveyed synchronously, and the central axes of the two pipe fittings coincide through arrangement of a first V-shaped frame and a second V-shaped frame; the positions of the two pipe fittings are detected through a visual camera, the pipe fittings are driven to move through operation of a first moving motor and a second moving motor correspondingly, the contact faces of the ends of the two pipe fittings are moved in the middle, and the contact faces of the ends of the two pipe fittings are arranged corresponding to the welding assembly; and the two pipe fittings can be conveniently positioned and welded.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical automatic welding, in particular to a mechanical automatic welding device and a welding method thereof. Background Art

[0002] In mechanical processing, in order to fix the parts together, welding is used to fix the two parts together. In the production process, in order to improve the welding efficiency, mechanical automated welding is used to perform uninterrupted welding processing, thereby improving the processing efficiency.

[0003] When welding pipe fittings, such as street lamps, which require welding of two sections of steel pipes with different diameters, the two sections of pipe fittings are mostly required to be loaded separately manually due to the different diameters of the two sections of pipe fittings. The loading process is relatively cumbersome. In order to ensure that the central axes of the two sections of pipe fittings are always in overlap, the two sections of pipe fittings are usually fixed on a clamping mechanism or a triangular chuck or other components to fix the positions of the two sections of pipe fittings and control the contact between the two sections of pipe fittings. Only then can the two sections of steel pipes with different diameters be circumferentially welded manually or by a welding mechanism. The process is cumbersome and the degree of automation is low, so the welding efficiency is low. Summary of the invention

[0004] The object of the present invention is to provide a mechanical automated welding device and a welding method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mechanical automated welding device comprises a feeding platform, a partition is fixedly installed in the middle of the feeding platform, conveying rollers are fixedly installed at equal distances on both sides of the feeding platform corresponding to the partition, the conveying rollers are arranged obliquely, and the conveying rollers are used to convey pipe fittings, a first fixed frame is fixedly installed at one end of the feeding platform corresponding to the conveying roller, a mounting frame is fixedly installed on the inner wall of the first fixed frame, a first rotating rod and a second rotating rod are rotatably installed between the two sides of the mounting frame and the two ends of the first fixed frame respectively, the first rotating rod and the second rotating rod rotate simultaneously, the first rotating rod and the second rotating rod rotate at different frequencies, and the middle part of the first rotating rod is fixedly installed with a first rotating rod. The central axis of a rotating rod is an axis on which a first push plate is fixedly installed in a ring array, several first push plate groups are in a gear-like structure, and the pipe fitting is between the two first push plates. The middle part of the second rotating rod is a ring-shaped array on which a second push plate is fixedly installed, with the central axis of the second rotating rod as the axis, several second push plate groups are in a gear-like structure, and the pipe fitting is between the two second push plates. A supporting frame is rotatably installed at one end of the feed platform through an axle pin, and the middle part of the supporting frame has first V-shaped frames and second V-shaped frames fixedly installed at equal distances at positions corresponding to the first rotating rod and the second rotating rod, respectively. The first V-shaped frames and the second V-shaped frames have different heights, and the first V-shaped frames and the second V-shaped frames are used to coincide with the same central axis and position the two sections of pipe fittings.

[0006] As a further preferred embodiment of the present technical solution, a feeding motor is fixedly mounted on one end of the first fixed frame, and the output end of the feeding motor passes through the first fixed frame and is fixedly connected to the first rotating rod, a first gear is fixedly mounted on the end of the first rotating rod away from the feeding motor, a second gear is rotatably mounted on the middle part of the mounting frame, the second gear is meshingly connected to the first gear, a third gear is fixedly mounted on the end of the second rotating rod close to the first gear, and the third gear is meshingly connected to the second gear.

[0007] As a further preferred embodiment of the present technical solution, the transmission ratio between the second gear and the first gear is 1:1.

[0008] As a further preferred embodiment of the present technical solution, a second fixed frame is fixedly installed on the upper position of the feed platform corresponding to the load-bearing frame, a mobile frame is slidably installed in the middle of the second fixed frame, a first hydraulic rod is symmetrically fixedly installed on the top of the mobile frame, and an adjusting frame is fixedly installed on the movable ends of the two first hydraulic rods through the mobile frame, and a first friction roller and a second friction roller are respectively rotatably installed on the bottom ends of both sides of the adjusting frame, and a first mobile motor and a second mobile motor for driving the first friction roller and the second friction roller are respectively fixedly installed on one side of the adjusting frame corresponding to the positions of the first friction roller and the second friction roller, a visual camera is fixedly installed in the middle of the adjusting frame, and a welding assembly is fixedly installed on one side of the middle of the adjusting frame.

[0009] As a further preferred embodiment of the technical solution, a second hydraulic rod is fixedly installed in the middle of one end of the second fixed frame, a mounting seat is fixedly installed on the movable end of the second hydraulic rod through the second fixed frame, a rotating motor is fixedly installed on one side of the mounting seat, and a rotating rubber roller is fixedly installed on the output end of the rotating motor through the mounting seat.

[0010] As a further preferred embodiment of the present technical solution, a positioning motor is fixedly installed on one side of the second fixed frame, a screw is rotatably installed on the middle part of the second fixed frame through a bearing, the output end of the positioning motor is fixedly connected to one end of the screw, the screw is threadedly connected to the middle part of the movable frame, and a limiting rod is symmetrically fixedly installed inside the second fixed frame, and the movable frame is slidably installed between the two limiting rods.

[0011] As a further preferred embodiment of the technical solution, balls are rollingly mounted on the inner walls of the first V-shaped frame and the second V-shaped frame at equal intervals.

[0012] As a further preferred embodiment of the present technical solution, a mounting rod is fixedly installed at the bottom end of the feed platform corresponding to the carrier frame, a third hydraulic rod is fixedly installed in the middle of the mounting rod, and a movable end of the third hydraulic rod is rotationally connected to the middle of the carrier frame through an axle pin.

[0013] As a further preferred embodiment of the present technical solution, both ends of the support frame are arranged obliquely.

[0014] As a further preferred embodiment of the present technical solution, a welding method of a mechanical automated welding device comprises the following steps:

[0015] S1. Place two pipes of different diameters on the conveying rollers on both sides of the partition respectively, and convey the pipes to the ends of the conveying rollers by the gravity of the pipes. The two pipes will move between the two first push plates and between the two second push plates respectively. Then, the first rotating rod will be driven to rotate by the operation of the feeding motor. The rotation of the first push plate is used to push and convey one pipe to the middle of the first V-shaped frame. At the same time, the meshing of the second gear with the first gear and the meshing of the third gear with the second gear will drive the other pipe to be synchronously conveyed to the middle of the second V-shaped frame. The central axes of the two sections of pipes will coincide with each other by the arrangement of the first V-shaped frame and the second V-shaped frame.

[0016] S2. Detect the positions of the two pipes through a visual camera, drive the adjustment frame to descend through the first hydraulic rod, and fit the first friction roller and the second friction roller to the surfaces of the two pipes respectively. Drive the first friction roller to rotate through the first moving motor to drive one of the pipes to slide in the middle of the first V-shaped frame. Drive the second friction roller to rotate through the second moving motor to drive the other pipe to slide in the middle of the second V-shaped frame. Detect the positions of the two pipes through a visual camera, and control the operation of the first moving motor and the second moving motor respectively to move the contact surfaces of the ends of the two pipes to the center, and set the contact surfaces of the ends of the two pipes to correspond to the welding assembly.

[0017] S3, before the position of the pipe is moved in the process of S2, when the ends of the two or one of the pipes are not between the first friction roller and the second friction roller, the screw rod can be driven to rotate by the positioning motor, and the screw rod and the movable frame are threadedly connected and the movable frame is limited by the limiting rod, which drives the adjusting frame to move left and right between the two limiting rods, so as to move the first friction roller and the second friction roller to be set at the ends of the pipe;

[0018] S4. After the contact surfaces of the ends of the two pipes are arranged corresponding to the welding assembly, the two pipes can be welded by operating the welding assembly. At the same time, the mounting seat is driven down by the second hydraulic rod, and the rotating rubber roller is made to contact the surface of one of the pipes. The rotating rubber roller is controlled by the rotating motor to rotate, which drives the two pipes to rotate, and is used for circumferential welding of the two pipes.

[0019] S5. After welding is completed, the rotating rubber roller, the first friction roller and the second friction roller are reset, and then the carrier is driven to rotate by the third hydraulic rod, and the welded pipe fittings are discharged through the inclined surface of the carrier.

[0020] The present invention provides a mechanical automated welding device and a welding method thereof, which have the following beneficial effects:

[0021] (1) The present invention places two pipes of different diameters on conveying rollers on both sides of a partition respectively, and conveys the pipes to the ends of the conveying rollers by the gravity of the pipes. The two pipes are respectively moved between the two first push plates and between the two second push plates. The first rotating rod is then driven to rotate by the operation of a feeding motor. The rotation of the first push plate is used to push and convey one pipe to the middle of the first V-shaped frame. At the same time, the second push plate is driven to rotate by the meshing of the second gear with the first gear and the meshing of the third gear with the second gear. The other pipe is synchronously conveyed to the middle of the second V-shaped frame. The central axes of the two sections of the pipe are overlapped by the arrangement of the first V-shaped frame and the second V-shaped frame, so as to facilitate the loading of the pipes.

[0022] (2) The present invention detects the positions of the two pipe fittings through a visual camera, drives the adjustment frame to descend through the first hydraulic rod, and respectively fits the first friction roller and the second friction roller to the surfaces of the two pipe fittings, and respectively drives the movement of the pipe fittings through the operation of the first moving motor and the second moving motor, so as to center the contact surfaces of the ends of the two pipe fittings, and set the contact surfaces of the ends of the two pipe fittings corresponding to the welding assembly, so as to facilitate the positioning welding of the two pipe fittings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is one of the overall structural schematic diagrams of the present invention;

[0024] Figure 2 This is the second schematic diagram of the overall structure of the present invention;

[0025] Figure 3 This is the third schematic diagram of the overall structure of the present invention;

[0026] Figure 4 is a schematic structural diagram of a first fixing frame of the present invention;

[0027] Figure 5 is a schematic structural diagram of a second fixing frame of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the adjustment frame of the present invention;

[0029] In the figure: 1. feeding platform; 2. partition; 3. conveying roller; 4. first fixed frame; 5. mounting frame; 6. first rotating rod; 7. second rotating rod; 8. first pushing plate; 9. second pushing plate; 10. supporting frame; 11. first V-shaped frame; 12. second V-shaped frame; 13. feeding motor; 14. first gear; 15. second gear; 16. third gear; 17. second fixed frame; 18. moving frame; 19. first hydraulic rod; 20. adjusting frame; 21. first friction roller; 22. second friction roller; 23. first moving motor; 24. second moving motor; 25. third hydraulic rod; 26. visual camera; 27. welding assembly; 28. second hydraulic rod; 29. ​​mounting seat; 30. rotating motor; 31. rotating rubber roller; 32. adjusting motor; 33. screw; 34. limiting rod; 35. ball; 36. mounting rod. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] The present invention provides a technical solution: Figures 1 to 6As shown, in this embodiment, a mechanical automated welding device includes a feeder platform 1, a partition plate 2 is fixedly installed in the middle of the feeder platform 1, and conveying rollers 3 are fixedly installed at equal distances on both sides of the feeder platform 1 corresponding to the partition plate 2. The conveying rollers 3 are arranged obliquely, and the conveying rollers 3 are used to convey pipe fittings. A first fixed frame 4 is fixedly installed at one end of the feeder platform 1 corresponding to the conveying roller 3, and a mounting frame 5 is fixedly installed on the inner wall of the first fixed frame 4. A first rotating rod 6 and a second rotating rod 7 are rotatably installed between the two sides of the mounting frame 5 and the two ends of the first fixed frame 4, respectively. The first rotating rod 6 and the second rotating rod 7 rotate simultaneously, and the rotation frequencies of the first rotating rod 6 and the second rotating rod 7 are different. A first push plate 8 is fixedly installed in an annular array in the middle of the first rotating rod 6 with the central axis of the first rotating rod 6 as the axis. A plurality of first push plates 8 are in a gear-like structure, and the pipe fittings are located between the two first push plates 8. A second push plate 9 is fixedly installed in an annular array in the middle of the second rotating rod 7 with the central axis of the second rotating rod 7 as the axis. The two push plates 9 are gear-shaped structures, and the pipe fittings are located between the two second push plates 9. A carrier frame 10 is rotatably mounted on one end of the feed platform 1 through an axle pin. The middle of the carrier frame 10 corresponds to the positions of the first rotating rod 6 and the second rotating rod 7 and is equidistantly fixed with a first V-shaped frame 11 and a second V-shaped frame 12. The first V-shaped frame 11 and the second V-shaped frame 12 have different heights. The first V-shaped frame 11 and the second V-shaped frame 12 are used to coincide with the same central axis of the two sections of pipe fittings, and two pipe fittings of different diameters are placed in the spacer. On the conveying rollers 3 on both sides of the plate 2, the pipe fittings are conveyed to the ends of the conveying rollers 3 by the gravity of the pipe fittings, and the two pipe fittings will be moved between the two first pushing plates 8 and between the two second pushing plates 9 respectively. Then, the two pipe fittings are conveyed to the middle of the first V-shaped frame 11 and the second V-shaped frame 12 by the rotation of the first pushing plate 8 and the second pushing plate 9. The central axes of the two sections of the pipe fittings are overlapped by the arrangement of the first V-shaped frame 11 and the second V-shaped frame 12, which is used to facilitate the coaxial arrangement of two pipe fittings of different diameters and facilitate the loading of the pipe fittings.

[0032] like Figures 1 to 6 As shown, a feeding motor 13 is fixedly installed at one end of the first fixed frame 4, and the output end of the feeding motor 13 passes through the first fixed frame 4 and is fixedly connected to the first rotating rod 6. A first gear 14 is fixedly installed at the end of the first rotating rod 6 away from the feeding motor 13. A second gear 15 is rotatably installed at the middle part of the mounting frame 5, and the second gear 15 is meshingly connected with the first gear 14. A third gear 16 is fixedly installed at one end of the second rotating rod 7 close to the first gear 14, and the third gear 16 is meshingly connected with the second gear 15. The transmission ratio of the third gear 16 to the second gear 15 is related to the diameter ratio of the two pipe fittings. Due to the different diameters of the two pipe fittings, the rotation angles of the first rotating rod 6 and the second rotating rod 7 are different when the pipe fittings are unloaded, which is used to ensure the simultaneous unloading of the two pipe fittings.

[0033] The feeding motor 13 drives the first rotating rod 6 to rotate, and the first pushing plate 8 rotates to push and convey one pipe. At the same time, the second gear 15 is engaged with the first gear 14 and the third gear 16 is engaged with the second gear 15 to drive the second pushing plate 9 to rotate, so as to synchronously convey another pipe to the middle of the second V-shaped frame 12, so as to realize the simultaneous unloading of two pipes.

[0034] like Figures 1 to 6 As shown, the transmission ratio of the second gear 15 to the first gear 14 is 1:1.

[0035] The 1:1 transmission meshing between the second gear 15 and the first gear 14 is used to stably transmit the rotation torque of the first rotating rod 6

[0036] like Figures 1 to 6 As shown, the feed platform 1 is fixedly installed with a second fixed frame 17 at the upper position corresponding to the supporting frame 10, and a movable frame 18 is slidably installed in the middle of the second fixed frame 17, and a first hydraulic rod 19 is symmetrically fixedly installed on the top of the movable frame 18, and the movable ends of the two first hydraulic rods 19 pass through the movable frame 18 and are fixedly installed with an adjusting frame 20, and the bottom ends of both sides of the adjusting frame 20 are respectively rotatably installed with a first friction roller 21 and a second friction roller 22, and one side of the adjusting frame 20 corresponds to the position of the first friction roller 21 and the second friction roller 22. A first movable motor 23 and a second movable motor 24 for driving the first friction roller 21 and the second friction roller 22 are respectively fixedly installed, a visual camera 26 is fixedly installed in the middle of the adjusting frame 20, and a welding assembly 27 is fixedly installed on one side of the middle of the adjusting frame 20.

[0037] The positions of the two pipes are detected by the visual camera 26, the adjusting frame 20 is driven down by the first hydraulic rod 19, and the first friction roller 21 and the second friction roller 22 are respectively attached to the surfaces of the two pipes. The first moving motor 23 and the second moving motor 24 are respectively driven to move the pipes, so as to center the contact surfaces of the ends of the two pipes, and the contact surfaces of the ends of the two pipes are arranged corresponding to the welding assembly 27. The two pipes can be welded by the operation of the welding assembly 27, so as to realize the positioning welding of the two pipes.

[0038] like Figures 1 to 6 As shown, a second hydraulic rod 28 is fixedly installed in the middle of one end of the second fixed frame 17, a mounting seat 29 is fixedly installed on the movable end of the second hydraulic rod 28 through the second fixed frame 17, a rotating motor 30 is fixedly installed on one side of the mounting seat 29, and a rotating rubber roller 31 is fixedly installed on the output end of the rotating motor 30 through the mounting seat 29.

[0039] The second hydraulic rod 28 drives the mounting seat 29 to descend, and the rotating rubber roller 31 is brought into contact with the surface of one of the pipe fittings. The rotating motor 30 controls the rotating rubber roller 31 to rotate, which drives the two pipe fittings to rotate for circumferential welding of the two pipe fittings.

[0040] like Figures 1 to 6 As shown, a positioning motor 32 is fixedly installed on one side of the second fixed frame 17, a screw rod 33 is rotatably installed in the middle of the second fixed frame 17 through a bearing, the output end of the positioning motor 32 is fixedly connected to one end of the screw rod 33, the screw rod 33 is threadedly connected to the middle of the movable frame 18, and a limiting rod 34 is symmetrically fixedly installed inside the second fixed frame 17, and the movable frame 18 is slidably installed between the two limiting rods 34.

[0041] The screw rod 33 is driven to rotate by the positioning motor 32, and the screw rod 33 is threadedly connected to the moving frame 18 and the limiting rod 34 limits the moving frame 18, which drives the adjustment frame 20 to move left and right between the two limiting rods 34, so as to move the first friction roller 21 and the second friction roller 22 to the end of the pipe.

[0042] like Figures 1 to 6 As shown, balls 35 are equidistantly and rollingly mounted on the inner walls of the first V-shaped frame 11 and the second V-shaped frame 12 .

[0043] The balls 35 come into contact with the pipe, thereby improving the stability of the pipe in the first V-shaped frame 11 and the second V-shaped frame 12 .

[0044] like Figures 1 to 6 As shown, a mounting rod 36 is fixedly installed at the bottom end of the feed platform 1 corresponding to the carrier frame 10, and a third hydraulic rod 25 is fixedly installed in the middle of the mounting rod 36. The movable end of the third hydraulic rod 25 is rotationally connected to the middle of the carrier frame 10 through an axle pin.

[0045] The carrier frame 10 is driven to rotate by the third hydraulic rod 25 , and the welded pipe fittings are discharged through the inclined surface of the carrier frame 10 .

[0046] like Figures 1 to 6 As shown, both ends of the support frame 10 are arranged obliquely.

[0047] When feeding the pipes into the first V-shaped frame 11 and the second V-shaped frame 12 , the feeding of the pipes can be limited by the two ends of the support frame 10 to prevent the pipes from falling off the support frame 10 .

[0048] like Figures 1 to 6 As shown, a welding method using a mechanical automated welding device as described in any one of claims 1 to 9 comprises the following steps:

[0049] S1. Place two pipes of different diameters on the conveying rollers 3 on both sides of the partition 2 respectively, and convey the pipes to the ends of the conveying rollers 3 by the gravity of the pipes. The two pipes will be moved between the two first push plates 8 and the two second push plates 9 respectively. Then, the first rotating rod 6 is driven to rotate by the operation of the feeding motor 13. The rotation of the first push plate 8 is used to push and convey one pipe and convey it to the middle of the first V-shaped frame 11. At the same time, the second push plate 9 is driven to rotate by the meshing of the second gear 15 with the first gear 14 and the meshing of the third gear 16 with the second gear 15. The other pipe is synchronously conveyed to the middle of the second V-shaped frame 12. The central axes of the two sections of pipes are overlapped by the arrangement of the first V-shaped frame 11 and the second V-shaped frame 12.

[0050] S2, the positions of the two pipes are detected by the visual camera 26, the adjustment frame 20 is driven to descend by the first hydraulic rod 19, the first friction roller 21 and the second friction roller 22 are respectively attached to the surfaces of the two pipes, the first friction roller 21 is driven to rotate by the first moving motor 23, and one of the pipes is driven to slide in the middle of the first V-shaped frame 11, the second friction roller 22 is driven to rotate by the second moving motor 24, and the other pipe is driven to slide in the middle of the second V-shaped frame 12, the positions of the two pipes are detected by the visual camera 26, and the first moving motor 23 and the second moving motor 24 are controlled to operate respectively, so as to center the contact surfaces of the ends of the two pipes, and the contact surfaces of the ends of the two pipes are set corresponding to the welding assembly 27;

[0051] S3, before the position of the pipe is moved in the process of S2, when the ends of the two or one of the pipes are not between the first friction roller 21 and the second friction roller 22, the screw 33 can be driven to rotate by the positioning motor 32, and the screw 33 and the movable frame 18 are threadedly connected and the movable frame 18 is limited by the limiting rod 34, which will drive the adjusting frame 20 to move left and right between the two limiting rods 34, so as to move the first friction roller 21 and the second friction roller 22 to the end of the pipe;

[0052] S4. After the contact surfaces of the ends of the two pipes are arranged corresponding to the welding assembly 27, the two pipes can be welded by the operation of the welding assembly 27. At the same time, the second hydraulic rod 28 drives the mounting seat 29 to descend, and the rotating rubber roller 31 is made to contact the surface of one of the pipes. The rotating motor 30 controls the rotating rubber roller 31 to rotate, which drives the two pipes to rotate, and is used for circumferential welding of the two pipes.

[0053] S5. After welding is completed, the rotating rubber roller 31, the first friction roller 21 and the second friction roller 22 are reset, and then the carrier frame 10 is driven to rotate by the third hydraulic rod 25, and the welded pipe fittings are discharged through the inclined surface of the carrier frame 10.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical automated welding device, characterized in that: The invention comprises a feeding platform (1), a partition (2) is fixedly installed in the middle of the feeding platform (1), conveying rollers (3) are fixedly installed at equal distances on both sides of the feeding platform (1) corresponding to the partition (2), the conveying rollers (3) are arranged in an inclined manner, and the conveying rollers (3) are used to convey pipe fittings, a first fixed frame (4) is fixedly installed at one end of the feeding platform (1) corresponding to the conveying roller (3), a mounting frame (5) is fixedly installed on the inner wall of the first fixed frame (4), a first rotating rod (6) and a second rotating rod (7) are rotatably installed on both sides of the mounting frame (5) and between the two ends of the first fixed frame (4), the first rotating rod (6) and the second rotating rod (7) rotate simultaneously, the first rotating rod (6) and the second rotating rod (7) rotate at different frequencies, and the middle part of the first rotating rod (6) is an annular array with the central axis of the first rotating rod (6) as the axis. A first push plate (8) is fixedly installed in a circular array manner, and a plurality of first push plates (8) are in a gear-like structure. The pipe fitting is located between the two first push plates (8). A second push plate (9) is fixedly installed in a circular array manner in the middle of the second rotating rod (7) with the central axis of the second rotating rod (7) as the axis. A plurality of second push plates (9) are in a gear-like structure. The pipe fitting is located between the two second push plates (9). A support frame (10) is rotatably installed at one end of the feed platform (1) through an axle pin. A first V-shaped frame (11) and a second V-shaped frame (12) are fixedly installed in the middle of the support frame (10) at equidistant positions corresponding to the positions of the first rotating rod (6) and the second rotating rod (7). The first V-shaped frame (11) and the second V-shaped frame (12) have different heights. The first V-shaped frame (11) and the second V-shaped frame (12) are used to coincide the same central axis of two sections of pipe fittings.

2. A mechanical automated welding device according to claim 1, characterized in that: A feeding motor (13) is fixedly mounted on one end of the first fixed frame (4), and an output end of the feeding motor (13) passes through the first fixed frame (4) and is fixedly connected to a first rotating rod (6); a first gear (14) is fixedly mounted on an end of the first rotating rod (6) away from the feeding motor (13); a second gear (15) is rotatably mounted on the middle part of the mounting frame (5), and the second gear (15) is meshingly connected to the first gear (14); a third gear (16) is fixedly mounted on an end of the second rotating rod (7) close to the first gear (14), and the third gear (16) is meshingly connected to the second gear (15).

3. A mechanical automated welding device according to claim 2, characterized in that: The transmission ratio between the second gear (15) and the first gear (14) is 1:

1.

4. The mechanical automated welding device according to claim 1, characterized in that: A second fixed frame (17) is fixedly installed on the feeding platform (1) at a position above the corresponding bearing frame (10); a movable frame (18) is slidably installed in the middle of the second fixed frame (17); a first hydraulic rod (19) is symmetrically fixedly installed on the top of the movable frame (18); the movable ends of the two first hydraulic rods (19) pass through the movable frame (18) and are fixedly installed with an adjusting frame (20); a first friction roller (21) and a second friction roller (22) are rotatably installed at the bottom ends of both sides of the adjusting frame (20); a first movable motor (23) and a second movable motor (24) for driving the first friction roller (21) and the second friction roller (22) are fixedly installed on one side of the adjusting frame (20) at positions corresponding to the first friction roller (21) and the second friction roller (22); a visual camera (26) is fixedly installed in the middle of the adjusting frame (20); and a welding assembly (27) is fixedly installed on one side of the middle of the adjusting frame (20).

5. A mechanical automated welding device according to claim 4, characterized in that: A second hydraulic rod (28) is fixedly mounted at the middle of one end of the second fixed frame (17); a movable end of the second hydraulic rod (28) passes through the second fixed frame (17) and is fixedly mounted with a mounting seat (29); a rotating motor (30) is fixedly mounted on one side of the mounting seat (29); and a rotating rubber roller (31) is fixedly mounted on the output end of the rotating motor (30) through the mounting seat (29).

6. A mechanical automated welding device according to claim 5, characterized in that: A positioning motor (32) is fixedly mounted on one side of the second fixed frame (17); a screw rod (33) is rotatably mounted in the middle of the second fixed frame (17) via a bearing; an output end of the positioning motor (32) is fixedly connected to one end of the screw rod (33); the screw rod (33) is threadedly connected to the middle of the movable frame (18); limiting rods (34) are symmetrically fixedly mounted inside the second fixed frame (17); and the movable frame (18) is slidably mounted between the two limiting rods (34).

7. The mechanical automated welding device according to claim 1, characterized in that: Balls (35) are equidistantly mounted on the inner walls of the first V-shaped frame (11) and the second V-shaped frame (12).

8. The mechanical automated welding device according to claim 4, characterized in that: A mounting rod (36) is fixedly mounted on the conveying platform (1) at the bottom end position corresponding to the carrier frame (10), a third hydraulic rod (25) is fixedly mounted on the middle part of the mounting rod (36), and a movable end of the third hydraulic rod (25) is rotationally connected to the middle part of the carrier frame (10) via an axle pin.

9. The mechanical automated welding device according to claim 8, characterized in that: The two ends of the carrier frame (10) are arranged obliquely.

10. A welding method using a mechanical automated welding device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Two pipes of different diameters are placed on the conveying rollers (3) on both sides of the partition (2) respectively. The pipes are conveyed to the ends of the conveying rollers (3) by the gravity of the pipes. The two pipes are moved respectively between the two first push plates (8) and between the two second push plates (9). The first rotating rod (6) is then driven to rotate by the operation of the feeding motor (13). The rotation of the first push plate (8) is used to push and convey one pipe and convey it to the middle of the first V-shaped frame (11). At the same time, the meshing of the second gear (15) with the first gear (14) and the meshing of the third gear (16) with the second gear (15) will drive the other pipe to be synchronously conveyed to the middle of the second V-shaped frame (12). The central axes of the two sections of pipes are overlapped by the arrangement of the first V-shaped frame (11) and the second V-shaped frame (12); S2, detecting the positions of the two pipes by means of a visual camera (26), driving the adjustment frame (20) to descend by means of a first hydraulic rod (19), placing the first friction roller (21) and the second friction roller (22) respectively in contact with the surfaces of the two pipes, driving the first friction roller (21) to rotate by means of a first moving motor (23), driving one of the pipes to slide in the middle of the first V-shaped frame (11), driving the second friction roller (22) to rotate by means of a second moving motor (24), driving the other pipe to slide in the middle of the second V-shaped frame (12), detecting the positions of the two pipes by means of a visual camera (26), and controlling the operation of the first moving motor (23) and the second moving motor (24) respectively, so as to center the contact surfaces of the ends of the two pipes, and setting the contact surfaces of the ends of the two pipes corresponding to the welding assembly (27); S3, before the position of the pipe is moved in the process of S2, when the ends of the two or one of the pipes are not between the first friction roller (21) and the second friction roller (22), the screw rod (33) can be driven to rotate by the positioning motor (32), and the screw rod (33) and the movable frame (18) are threadedly connected and the movable frame (18) is limited by the limiting rod (34), so that the adjusting frame (20) is driven to move left and right between the two limiting rods (34), so as to move the first friction roller (21) and the second friction roller (22) to be located at the ends of the pipe; S4. After the contact surfaces of the ends of the two pipes are arranged to correspond to the welding assembly (27), the two pipes can be welded by operating the welding assembly (27). At the same time, the second hydraulic rod (28) drives the mounting seat (29) to descend, and the rotating rubber roller (31) is brought into contact with the surface of one of the pipes. The rotating motor (30) controls the rotating rubber roller (31) to rotate, which drives the two pipes to rotate, so as to perform circumferential welding of the two pipes. S5. After welding is completed, the rotating rubber roller (31), the first friction roller (21) and the second friction roller (22) are reset, and then the carrier frame (10) is driven to rotate by the third hydraulic rod (25), and the welded pipe fittings are discharged through the inclined surface of the carrier frame (10).

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