A welding device for connecting metal pipes

Abstract

This invention discloses a welding device for butt welding of metal pipes. The invention relates to the field of metal pipe welding technology and includes a fixed frame with a first inner cavity. Annular grooves are formed on both sides of the fixed frame, and a motor is mounted at the bottom. One end of a transmission shaft is fixedly connected to the output end of the motor. The advantages of this invention are: it can automatically adjust the bevel shape according to the pipe wall thickness, eliminating the need to measure the pipe wall thickness during the metal pipe welding process to match the appropriate cutting tool shape, resulting in a corresponding bevel shape. This saves time and effort in beveling, improving the efficiency of butt welding of metal pipes and reducing manual operation steps, thus avoiding human welding errors. Furthermore, regardless of the pipe diameter, the cutting tool can effectively contact the metal pipe even with different bevel cutting methods, eliminating the need for manual readjustment of the cutting tool position, avoiding operational errors, and ensuring the efficiency of metal pipe welding.

Description

Technical Field

[0001] This invention relates to the field of metal pipe welding technology, specifically to a welding device for butt welding of metal pipes. Background Technology

[0002] The welding process for metal pipe joints requires adjustments to operational details based on the material, pipe diameter, and process requirements. The specific welding process is as follows: Prepare a welding machine, welding materials, argon gas (purity ≥99.96%), a grinding wheel, and a wire brush. Then, use an angle grinder or sandpaper to clean the bevel and the surrounding 25mm area of ​​oil and rust until the metal luster is exposed. Cut the ends of the metal pipes into corresponding bevel shapes according to the wall thickness of the metal pipes. Finally, align and weld the two metal pipes.

[0003] It needs further explanation that the bevel shapes include I-shaped, V-shaped, and X-shaped. Among them, the I-shaped bevel is suitable for welding thin plates or thin-walled pipes with a wall thickness of ≤3.5mm. It is simple to process and low in cost. Its shape is a straight edge butt joint without beveling or with only a small gap, resembling the letter "I". The V-shaped bevel is suitable for medium and thick plates (wall thickness ≤16mm) and is widely used in pipe welding. It is easy to process but has greater deformation after welding. Its shape is a single-sided or double-sided "V" opening, with a single-sided bevel angle of 30°~70° and a blunt edge of 0.5~2mm. The X-shaped bevel is suitable for welding thick plates (wall thickness ≥16mm). It can reduce the amount of filler metal by 50% and reduce residual stress. Its shape is a double-sided symmetrical "V" combination, resembling "X".

[0004] A search revealed that Chinese patent application CN116511778B discloses a circumferential welding device for metal air-cooled pipes. While this device can automatically clamp, align, and move air-cooled pipe fittings to the welding position for butt welding, and then perform circumferential welding on the butt joints of the fittings, resulting in higher automation and improved welding efficiency, it cannot automatically adjust the bevel shape according to the pipe wall thickness. This necessitates measuring the pipe wall thickness, matching and installing a corresponding cutting tool, and finally cutting the pipe. This makes beveling time-consuming and labor-intensive, reducing the efficiency of butt welding of metal pipes and increasing manual operation steps, which can easily lead to human-induced welding errors. Furthermore, when beveling metal pipes of different diameters, the cutting tool cannot effectively contact the pipe as the diameter increases or decreases, requiring manual readjustment of the cutting tool position, further increasing operational errors and affecting welding efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a welding device for connecting metal pipes.

[0006] To address the problems mentioned in the background art, the present invention provides the following technical solution: a welding device for metal pipe butt welding, comprising a fixed frame, a first inner cavity being formed inside the fixed frame, annular grooves being formed on both sides of the fixed frame, and a motor being installed at the bottom end of the fixed frame. One end of a transmission shaft is fixedly connected to the output end of the motor, and a driving gear is fixedly connected to the other end of the transmission shaft. A driven gear ring is meshed with the outer surface of the driving gear, and a rotating block is fixedly connected to the inner surface of the driven gear ring. A second inner cavity is formed at both ends of the rotating block, and a first guide groove and a second guide groove are formed on both sides of the second inner cavity. A transmission rod is rotatably connected to the outer surface of the rotating block, and the transmission rod extends into the second inner cavity. A small bevel gear is fixedly connected to the end of the transmission rod, and a large bevel gear is meshed with the outer surface of the small bevel gear. A spiral groove is fixedly connected to both ends of the large bevel gear, and a first locking block and a second locking block are engaged on the spiral grooves at both ends. A pawl is fixedly connected to the end face of the second locking block, and a push rod is fixedly connected to the end face of the first locking block.

[0007] A connecting rod is fixed to the outer surface of the fixed frame. A sliding groove is provided on the connecting rod. The sliding groove is connected to the annular groove. A slider is slidably sleeved in the sliding groove. A vertical rod is fixed to the bottom surface of the slider. A bearing plate is fixed to the side wall of the slider. An electric push rod is installed on the bearing plate. A positioning block is fixed to the output end of the electric push rod.

[0008] As a further embodiment of the present invention: the driving gear and the driven gear ring are both rotatably sleeved with the first inner cavity, the rotating block is sleeved with the fixed frame, the large bevel gear is rotatably sleeved with the second inner cavity, and two large bevel gears are provided, with a connecting shaft fixedly connected between the two large bevel gears.

[0009] As a further embodiment of the present invention: the first locking block is slidably sleeved with the second guide groove, the second locking block is slidably sleeved with the first guide groove, and the locking claws are provided in two sets, and the two sets of locking claws are evenly distributed about the central axis of the rotating block.

[0010] As a further embodiment of the present invention: the top rod is slidably sleeved with the annular groove, the vertical rod is slidably sleeved with the sliding groove, and the bottom surface of the vertical rod is in contact with the top surface of the top rod.

[0011] As a further embodiment of the present invention: the cross-sections of the slide groove and the slider are both U-shaped, the positioning block is T-shaped, and there are two sets of connecting rods and electric push rods, and the two sets of connecting rods and the two sets of electric push rods are symmetrically arranged about the bisecting plane of the fixed frame.

[0012] As a further embodiment of the present invention: a rotating shaft is hinged to the side wall of the positioning block, a first connecting block is sleeved on the outer surface of the rotating shaft, a first cutting tool is fixedly connected to the end of the first connecting block, a fixing plate is fixedly connected to the side wall of the bearing plate, a first rotating rod and a second rotating rod are rotatably connected to the bottom surface of the fixing plate, a support block is rotatably connected to the bottom end of the first rotating rod and the second rotating rod, a mating block is fixedly connected to the top end of the support block, the mating block is sleeved with the first rotating rod, and a second connecting block is connected to the side wall of the mating block through the rotating shaft, a second cutting tool is fixedly connected to the end of the second connecting block, external threads are fixedly connected to the outer surfaces of the first rotating rod and the second rotating rod, and a third guide groove is opened on the outer surfaces of the first rotating rod and the second rotating rod, the third guide groove penetrating the external threads, a driving helical gear is rotatably sleeved in the positioning block and the mating block, the driving helical gear is fitted into the third guide groove, a driven helical gear is meshed with the outer surface of the driving helical gear, one end of a transmission chain is fixedly connected to the end face of the driven helical gear, and the other end of the transmission chain is fixedly connected to the rotating shaft.

[0013] As a further aspect of the present invention: the top surface of the first cutting blade is flush with the bottom surface of the positioning block, and the bottom surface of the second cutting blade is tangent to the moving trajectory of the chuck.

[0014] As a further aspect of the present invention: the positioning block is engaged with the external threads on the first rotating rod and the second rotating rod; the driving helical gear inside the positioning block is sleeved with the second rotating rod; the driving helical gear inside the mating block is sleeved with the first rotating rod; and the vertical height difference between the external thread on the first rotating rod and the bottom surface of the positioning block is... The vertical height difference between the external thread on the second rotating rod and the bottom surface of the second cutting tool .

[0015] Compared with the prior art, the beneficial effects of the present invention, using the above technical solution, are as follows:

[0016] 1. In this invention, the first cutting tool is driven to descend by the first connecting block on the positioning block. If the positioning block remains above the external thread on the first rotating rod, the first cutting tool, in conjunction with the second cutting tool, cuts the bevel of the metal tube into an X shape. When the positioning block moves to the external thread on the first rotating rod, the vertical height from the bottom surface of the positioning block to the bottom surface of the second cutting tool is... As the positioning block continues to descend, its external thread causes the first rotating rod to rotate, which in turn drives the active helical gear within the mating block to rotate via the third guide groove. This, in turn, causes the driven helical gear to rotate, which in turn drives the transmission chain to rotate. The transmission chain then drives the rotating shaft, which in turn drives the second connecting block and the second cutting tool to rotate. This causes the second cutting tool to change from an inclined state to a vertical state, allowing the first and second cutting tools to cut the bevel of the metal tube into a V-shape. If the positioning block moves to the external thread on the second rotating rod, the vertical distance from the bottom surface of the positioning block to the bottom surface of the second cutting tool... As the positioning block continues to descend, its external thread drives the second rotating rod to rotate. Similarly, the active helical gear inside the positioning block drives the driven helical gear to rotate, causing the first cutting tool on the first connecting block to change from an inclined state to a vertical state. At this point, the first cutting tool cuts the bevel of the metal pipe into an I-shape. Simultaneously, the first and second cutting tools overlap and are misaligned. In summary, the bevel shape can be automatically adjusted according to the pipe wall thickness, eliminating the need to measure the pipe wall thickness during the metal pipe welding process. The corresponding cutting tool shape is matched, resulting in a bevel with the appropriate shape. This saves time and effort in beveling, not only improving the efficiency of metal pipe butt welding but also reducing manual operation steps and avoiding human welding errors.

[0017] 2. This invention uses an electric drill to drive the transmission rod to rotate, which in turn causes the small bevel gear on the transmission rod to drive the large bevel gear to rotate. This causes the spiral groove on the large bevel gear to move the first and second locking blocks. The first locking block is restricted by the second guide groove, and the second locking block is restricted by the first guide groove. This causes the first and second locking blocks to move centrifugally under the influence of the spiral groove. As a result, the claws on the second locking block press against the inner wall of the metal tube, thus securing the metal tube. At the same time, the centrifugal movement of the first locking block pushes the vertical rod to move through the push rod. This causes the slider on the vertical rod to move the bearing plate, which in turn moves the electric push rod, the positioning block, the first cutting tool, and the second cutting tool. In summary, the first and second cutting tools move synchronously with the claws, and the movement distance is the same. This allows the cutting tools to effectively contact the metal tubes during beveling, regardless of whether the tube diameter is large or small. This eliminates the need for manual readjustment of the cutting tool position, avoiding operational errors and ensuring the efficiency of metal tube welding.

[0018] 3. This invention drives the drive gear to rotate via the transmission shaft on the motor, which in turn drives the driven gear ring to rotate, which in turn drives the rotating block on the driven gear ring to rotate. The rotating block drives the metal tube to rotate via the chuck, allowing the metal tubes at both ends of the rotating block to be cut simultaneously. This allows the processing of two joints to be completed in one operation, further simplifying the operation and improving the welding efficiency when metal tubes are joined. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a welding device for connecting metal pipes according to the present invention;

[0020] Figure 2 This is a half-sectional schematic diagram of the fixing frame structure in an embodiment of the present invention;

[0021] Figure 3 This is a half-sectional schematic diagram of the block structure in an embodiment of the present invention;

[0022] Figure 4 As described in the embodiments of the present invention Figure 3 Enlarged view of the structure of section A in the middle;

[0023] Figure 5 This is a schematic diagram of the spiral groove structure in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the positioning block structure in an embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the positioning block structure in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the claw structure in an embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the fixing frame structure in an embodiment of the present invention.

[0028] In the diagram: 1. Fixed frame; 2. First inner cavity; 3. Annular groove; 4. Motor; 5. Drive shaft; 6. Driving gear; 7. Driven gear ring; 8. Rotary block; 9. Second inner cavity; 10. First guide groove; 11. Second guide groove; 12. Drive rod; 13. Small bevel gear; 14. Large bevel gear; 15. Helical groove; 16. Connecting shaft; 17. First locking block; 18. Second locking block; 19. Claw; 20. Push rod; 21. Connecting rod; 22. Slide 23. Slot; 24. Slider; 25. Vertical rod; 26. Bearing plate; 27. Electric push rod; 28. Positioning block; 29. ​​First connecting block; 30. First cutting tool; 31. Fixing plate; 32. First rotating rod; 33. Second rotating rod; 34. Support block; 35. Mating block; 36. Second connecting block; 37. Second cutting tool; 38. Third guide slot; 39. Driving helical gear; 40. Drive chain; 41. Rotating shaft; 42. External thread. Detailed Implementation

[0029] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] Please see Figures 1-5 , Figure 8 and Figure 9This invention provides a technical solution: a welding device for metal pipe butt welding, including a fixed frame 1, a first inner cavity 2 formed inside the fixed frame 1, annular grooves 3 formed on both sides of the fixed frame 1, and a motor 4 installed at the bottom end of the fixed frame 1. One end of a transmission shaft 5 is fixedly connected to the output end of the motor 4, and a driving gear 6 is fixedly connected to the other end of the transmission shaft 5. A driven gear ring 7 is meshed with the outer surface of the driving gear 6, and a rotating block 8 is fixedly connected to the inner surface of the driven gear ring 7. A second inner cavity 9 is formed at both ends of the rotating block 8. The first guide groove 10 and the second guide groove 11 are provided on the side. The outer surface of the rotating block 8 is rotatably connected to the transmission rod 12. The transmission rod 12 extends into the second inner cavity 9, and the end of the transmission rod 12 is fixedly connected to the small bevel gear 13. The outer surface of the small bevel gear 13 is meshed with the large bevel gear 14. Both ends of the large bevel gear 14 are fixedly connected to the spiral grooves 15, and the spiral grooves 15 at both ends are engaged with the first locking block 17 and the second locking block 18. The end face of the second locking block 18 is fixedly connected to the claw 19, and the end face of the first locking block 17 is fixedly connected to the push rod 20.

[0032] Please see Figure 2 , Figure 3 and Figure 9 The driving gear 6 and the driven gear ring 7 are both rotatably sleeved with the first inner cavity 2, the rotating block 8 is sleeved with the fixed frame 1, and the large bevel gear 14 is rotatably sleeved with the second inner cavity 9. There are two large bevel gears 14, and a connecting shaft 16 is fixedly connected between the two large bevel gears 14.

[0033] Please see Figure 2 and Figure 4 The first locking block 17 is slidably sleeved with the second guide groove 11, and the second locking block 18 is slidably sleeved with the first guide groove 10. There are two sets of locking claws 19, and the two sets of locking claws 19 are evenly distributed about the central axis of the rotating block 8.

[0034] Specifically, during the adjustment of the bevel shape, the electric push rod 26 on the bearing plate 25 is activated, causing the electric push rod 26 to push the positioning block 27 to move centripetally until the positioning block 27 contacts the outer surface of the metal tube. Meanwhile, the bottom surface of the second cutting tool 36 remains tangent to the movement trajectory of the chuck 19, ensuring that the vertical height from the bottom surface of the positioning block 27 to the bottom surface of the second cutting tool 36 is equal to the wall thickness of the metal tube. During this process, as the positioning block 27 descends, the first connecting block 28 on the positioning block 27 drives the first cutting tool 29 to descend. If the positioning block 27 remains above the external thread 42 on the first rotating rod 31, the first cutting tool 29, in conjunction with the second cutting tool 36, cuts the bevel of the metal tube into an X-shape. When the positioning block 27 moves to the external thread 42 on the first rotating rod 31, the vertical height from the bottom surface of the positioning block 27 to the bottom surface of the second cutting tool 36... As the positioning block 27 continues to descend, the positioning block 27, in conjunction with the external thread 42, drives the first rotating rod 31 to rotate. This causes the first rotating rod 31 to drive the active helical gear 38 within the mating block 34 to rotate via the third guide groove 37. The active helical gear 38 then drives the driven helical gear 39 to rotate, which in turn drives the transmission chain 40 to rotate. The transmission chain 40 then drives the rotating shaft 41 to rotate, which in turn drives the second connecting block 35 and the second cutting tool 36 to rotate. This causes the second cutting tool 36 to change from an inclined state to a vertical state, allowing the first cutting tool 29 to work with the second cutting tool 36 to cut the bevel of the metal tube into a V-shape. If the positioning block 27 moves to the external thread 42 on the second rotating rod 32, the vertical height from the bottom surface of the positioning block 27 to the bottom surface of the second cutting tool 36... As the positioning block 27 continues to descend, the positioning block 27, in conjunction with the external thread 42, drives the second rotating rod 32 to rotate. Similarly, the driving helical gear 38 inside the positioning block 27 drives the driven helical gear 39 to rotate, thereby causing the first cutting blade 29 on the first connecting block 28 to change from an inclined state to a vertical state. At this time, the first cutting blade 29 cuts the bevel of the metal tube into an I-shape. At the same time, the first cutting blade 29 and the second cutting blade 36 are misaligned and overlapped. In summary, the shape of the bevel can be automatically adjusted according to the thickness of the tube wall, so that the welding process of the metal tube does not need to measure the thickness of the tube wall to match the cutting blade of the corresponding shape. The bevel presents the corresponding shape, making the bevel treatment time-saving and labor-saving. It not only improves the efficiency of metal tube butt welding, but also reduces manual operation steps and avoids human welding errors.

[0035] Example 2

[0036] Please see Figure 3 , Figure 4 , Figure 6 and Figure 7This invention provides a technical solution: a welding device for metal pipe butt welding, wherein a rotating shaft 41 is hinged to the side wall of a positioning block 27, a first connecting block 28 is sleeved on the outer surface of the rotating shaft 41, a first cutting tool 29 is fixedly connected to the end of the first connecting block 28, a fixing plate 30 is fixedly connected to the side wall of a bearing plate 25, a first rotating rod 31 and a second rotating rod 32 are rotatably connected to the bottom surface of the fixing plate 30, a support block 33 is rotatably connected to the bottom ends of the first rotating rod 31 and the second rotating rod 32, a mating block 34 is fixedly connected to the top end of the support block 33, the mating block 34 is sleeved with the first rotating rod 31, and a first cutting tool 29 is connected to the side wall of the mating block 34 via the rotating shaft 41. Two connecting blocks 35, with a second cutting tool 36 fixedly connected to the end of the second connecting block 35. The outer surfaces of the first rotating rod 31 and the second rotating rod 32 are both fixedly connected with external threads 42, and a third guide groove 37 is opened on the outer surfaces of the first rotating rod 31 and the second rotating rod 32. The third guide groove 37 passes through the external threads 42. The positioning block 27 and the mating block 34 are rotatably sleeved with a driving helical gear 38. The driving helical gear 38 is engaged with the third guide groove 37. The outer surface of the driving helical gear 38 is meshed with a driven helical gear 39. One end of the transmission chain 40 is fixedly connected to the end face of the driven helical gear 39. The other end of the transmission chain 40 is fixedly connected to the rotating shaft 41.

[0037] Please see Figure 5 and Figure 7 The top surface of the first cutting blade 29 is flush with the bottom surface of the positioning block 27, and the bottom surface of the second cutting blade 36 is tangent to the moving trajectory of the chuck 19.

[0038] Please see Figure 6 and Figure 7 The positioning block 27 is engaged with the external threads 42 on the first rotating rod 31 and the second rotating rod 32. The driving helical gear 38 inside the positioning block 27 is sleeved with the second rotating rod 32. The driving helical gear 38 inside the mating block 34 is sleeved with the first rotating rod 31. The vertical height difference between the external thread 42 on the first rotating rod 31 and the bottom surface of the positioning block 27 is... The vertical height difference between the external thread 42 on the second rotating rod 32 and the bottom surface of the second cutting tool 36 .

[0039] Specifically, during the process of fixing the metal tubes, the two metal tubes that need to be aligned are placed at both ends of the rotating block 8, and the chuck 19 is inserted into the metal tubes. At this time, the drill bit of the electric drill is inserted into the transmission rod 12, and the electric drill is started, causing the electric drill to drive the transmission rod 12 to rotate. This causes the small bevel gear 13 on the transmission rod 12 to drive the large bevel gear 14 to rotate, causing the spiral groove 15 on the large bevel gear 14 to drive the first chuck 17 and the second chuck 18 to move. The first chuck 17 is restricted by the second guide groove 11, and the second chuck 18 is restricted by the first guide groove 10. This causes the first chuck 17 and the second chuck 18 to move centrifugally under the action of the spiral groove 15, thereby causing the second chuck 18 to move. The jaws 19 press against the inner wall of the metal tube, thus securing the metal tube. At the same time, the centrifugal translation of the first clamping block 17 pushes the vertical rod 24 to move through the top rod 20, causing the slider 23 on the vertical rod 24 to move the bearing plate 25. The bearing plate 25 then moves the electric push rod 26, the positioning block 27, the first cutter 29, and the second cutter 36. In summary, the first cutter 29 and the second cutter 36 move synchronously with the jaws 19, and the translation distance is the same. This allows the cutter to effectively contact the metal tube when beveling different metal tubes, whether the tube diameter is large or small. This eliminates the need for manual readjustment of the cutter position, avoiding operational errors and ensuring the efficiency of metal tube welding.

[0040] Example 3

[0041] Please see Figures 1-4 and Figure 6 The present invention provides a technical solution: a welding device for metal pipe connection, wherein a connecting rod 21 is fixedly connected to the outer surface of the fixed frame 1, a sliding groove 22 is provided on the connecting rod 21, the sliding groove 22 is connected to the annular groove 3, and a slider 23 is slidably sleeved in the sliding groove 22. A vertical rod 24 is fixedly connected to the bottom surface of the slider 23, and a bearing plate 25 is fixedly connected to the side wall of the slider 23. An electric push rod 26 is installed on the bearing plate 25, and a positioning block 27 is fixedly connected to the output end of the electric push rod 26.

[0042] Please see Figure 4 The top rod 20 is slidably sleeved with the annular groove 3, and the vertical rod 24 is slidably sleeved with the sliding groove 22, with the bottom surface of the vertical rod 24 in contact with the top surface of the top rod 20.

[0043] Please see Figure 1 and Figure 6 The cross-sections of the slide groove 22 and the slider 23 are both U-shaped, the positioning block 27 is T-shaped, and there are two sets of connecting rods 21 and electric push rods 26. The two sets of connecting rods 21 and the two sets of electric push rods 26 are symmetrical about the bisecting plane of the fixed frame 1.

[0044] Specifically, during the cutting of the metal tube, the motor 4 is started, which causes the drive shaft 5 on the motor 4 to drive the drive gear 6 to rotate, which in turn causes the driven gear ring 7 to rotate, which in turn causes the rotating block 8 on the driven gear ring 7 to rotate. The rotating block 8 drives the metal tube to rotate through the chuck 19, so that the metal tubes at both ends of the rotating block 8 can be cut simultaneously. Thus, the processing of two joints can be completed in one operation, further simplifying the operation and improving the welding efficiency when metal tubes are joined.

[0045] The working principle and usage process of this invention: When metal pipes are joined and welded, the two metal pipes to be aligned are placed at both ends of the rotating block 8, and the chuck 19 is inserted into the metal pipes. Then, the drill bit of the electric drill is inserted into the transmission rod 12, and the electric drill is started, causing the electric drill to drive the transmission rod 12 to rotate. This causes the small bevel gear 13 on the transmission rod 12 to drive the large bevel gear 14 to rotate, causing the spiral groove 15 on the large bevel gear 14 to drive the first chuck 17 and the second chuck 18 to move. The first chuck 17 is restricted by the second guide groove 11, and the second chuck 18 is restricted by the first guide groove 10. This causes the first chuck 17 and the second chuck 18 to move centrifugally under the influence of the spiral groove 15, thereby causing the second... The jaws 19 on the clamping block 18 press against the inner wall of the metal tube, thereby securing the metal tube. At the same time, the centrifugal translation of the first clamping block 17 pushes the vertical rod 24 to move through the top rod 20, causing the slider 23 on the vertical rod 24 to move the bearing plate 25. The bearing plate 25 then moves the electric push rod 26, the positioning block 27, the first cutter 29, and the second cutter 36. In summary, the first cutter 29 and the second cutter 36 move synchronously with the jaws 19, and the translation distance is the same. This allows the cutter to effectively contact the metal tube when beveling different metal tubes, whether the tube diameter is large or small. This eliminates the need for manual readjustment of the cutter position, avoids operational errors, and ensures the efficiency of metal tube welding.

[0046] After the metal tube is fixed, the electric push rod 26 on the support plate 25 is activated, causing the electric push rod 26 to push the positioning block 27 to move centripetally until the positioning block 27 contacts the outer surface of the metal tube. The bottom surface of the second cutting blade 36 is always tangent to the moving trajectory of the chuck 19, so that the vertical height from the bottom surface of the positioning block 27 to the bottom surface of the second cutting blade 36 is equal to the wall thickness of the metal tube. During the above process, as the positioning block 27 descends, the first connecting block 28 on the positioning block 27 drives the first cutting blade 29 to descend. If the positioning block 27 is always above the external thread 42 on the first rotating rod 31, the first cutting blade 29, in conjunction with the second cutting blade 36, cuts the bevel of the metal tube into an X shape. When the positioning block 27 moves to the external thread 42 on the first rotating rod 31, the vertical height from the bottom surface of the positioning block 27 to the bottom surface of the second cutting blade 36 is... As the positioning block 27 continues to descend, the positioning block 27, in conjunction with the external thread 42, drives the first rotating rod 31 to rotate. This causes the first rotating rod 31 to drive the active helical gear 38 within the mating block 34 to rotate via the third guide groove 37. The active helical gear 38 then drives the driven helical gear 39 to rotate, which in turn drives the transmission chain 40 to rotate. The transmission chain 40 then drives the rotating shaft 41 to rotate, which in turn drives the second connecting block 35 and the second cutting tool 36 to rotate. This causes the second cutting tool 36 to change from an inclined state to a vertical state, allowing the first cutting tool 29 to work with the second cutting tool 36 to cut the bevel of the metal tube into a V-shape. If the positioning block 27 moves to the external thread 42 on the second rotating rod 32, the vertical height from the bottom surface of the positioning block 27 to the bottom surface of the second cutting tool 36... As the positioning block 27 continues to descend, the positioning block 27, in conjunction with the external thread 42, drives the second rotating rod 32 to rotate. Similarly, the active helical gear 38 inside the positioning block 27 drives the driven helical gear 39 to rotate, thereby causing the first cutting blade 29 on the first connecting block 28 to change from an inclined state to a vertical state. At this time, the first cutting blade 29 cuts the bevel of the metal tube into an I-shape. At the same time, the first cutting blade 29 and the second cutting blade 36 are misaligned and overlapped. In summary, the shape of the bevel can be automatically adjusted according to the thickness of the tube wall, so that the welding process of the metal tube does not need to measure the thickness of the tube wall to match the cutting blade of the corresponding shape. The bevel presents the corresponding shape, making the bevel treatment time-saving and labor-saving. It not only improves the efficiency of metal tube butt welding, but also reduces manual operation steps and avoids human welding errors.

[0047] After the above process is completed, start the motor 4, so that the transmission shaft 5 on the motor 4 drives the drive gear 6 to rotate, so that the drive gear 6 drives the driven gear ring 7 to rotate, which in turn causes the rotating block 8 on the driven gear ring 7 to rotate. The rotating block 8 drives the metal tube to rotate through the chuck 19, so that the metal tubes at both ends of the rotating block 8 can be cut synchronously. Thus, the processing of two joints can be completed in one operation, further simplifying the operation and improving the welding efficiency when the metal tubes are joined.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A welding device for butt welding of metal pipes, characterized in that, The device includes a fixed frame (1), which has a first inner cavity (2) and annular grooves (3) on both sides. A motor (4) is installed at the bottom of the fixed frame (1). One end of a transmission shaft (5) is fixedly connected to the output end of the motor (4), and a drive gear (6) is fixedly connected to the other end of the transmission shaft (5). A driven gear ring (7) is meshed with the outer surface of the drive gear (6), and a rotating block (8) is fixedly connected to the inner surface of the driven gear ring (7). A second inner cavity (9) is opened at both ends of the rotating block (8), and a first guide groove (10) is opened on both sides of the second inner cavity (9). The outer surface of the rotating block (8) is rotatably connected to the second guide groove (11), the transmission rod (12) extends into the second inner cavity (9), and the end of the transmission rod (12) is fixedly connected to a small bevel gear (13). The outer surface of the small bevel gear (13) is meshed with a large bevel gear (14). Both ends of the large bevel gear (14) are fixedly connected to a spiral groove (15), and the spiral grooves (15) at both ends are engaged with a first locking block (17) and a second locking block (18). The end face of the second locking block (18) is fixedly connected to a pawl (19), and the end face of the first locking block (17) is fixedly connected to a push rod (20). A connecting rod (21) is fixed to the outer surface of the fixed frame (1). A sliding groove (22) is provided on the connecting rod (21). The sliding groove (22) is connected to the annular groove (3). A slider (23) is slidably sleeved in the sliding groove (22). A vertical rod (24) is fixed to the bottom surface of the slider (23). A bearing plate (25) is fixed to the side wall of the slider (23). An electric push rod (26) is installed on the bearing plate (25). A positioning block (27) is fixed to the output end of the electric push rod (26).

2. The welding device for butt welding of metal pipes according to claim 1, characterized in that: The driving gear (6) and the driven gear ring (7) are both rotatably sleeved with the first inner cavity (2), the rotating block (8) is sleeved with the fixed frame (1), the large bevel gear (14) is rotatably sleeved with the second inner cavity (9), there are two large bevel gears (14), and a connecting shaft (16) is fixed between the two large bevel gears (14).

3. The welding device for butt welding of metal pipes according to claim 1, characterized in that: The first locking block (17) is slidably sleeved with the second guide groove (11), the second locking block (18) is slidably sleeved with the first guide groove (10), and the locking claws (19) are provided in two sets, and the two sets of locking claws (19) are evenly distributed about the central axis of the rotating block (8).

4. The welding device for butt welding of metal pipes according to claim 1, characterized in that: The top rod (20) is slidably sleeved with the annular groove (3), the vertical rod (24) is slidably sleeved with the sliding groove (22), and the bottom surface of the vertical rod (24) is in contact with the top surface of the top rod (20).

5. The welding device for butt welding of metal pipes according to claim 1, characterized in that: The cross-sections of the slide (22) and the slider (23) are both U-shaped, the positioning block (27) is T-shaped, and there are two sets of connecting rods (21) and electric push rods (26), and the two sets of connecting rods (21) and the two sets of electric push rods (26) are symmetrical about the bisecting plane of the fixed frame (1).

6. The welding device for butt welding of metal pipes according to claim 1, characterized in that: A pivot (41) is hinged to the side wall of the positioning block (27). A first connecting block (28) is sleeved on the outer surface of the pivot (41). A first cutter (29) is fixed to the end of the first connecting block (28). A fixing plate (30) is fixed to the side wall of the bearing plate (25). A first rotating rod (31) and a second rotating rod (32) are rotatably connected to the bottom surface of the fixing plate (30). A support block (33) is rotatably connected to the bottom end of the first rotating rod (31) and the second rotating rod (32). A mating block (34) is fixed to the top end of the support block (33). The mating block (34) is sleeved with the first rotating rod (31), and a second connecting block (35) is connected to the side wall of the mating block (34) through the pivot (41). The end of the block (35) is fixedly connected to a second cutting tool (36). The outer surfaces of the first rotating rod (31) and the second rotating rod (32) are both fixedly connected to external threads (42). A third guide groove (37) is opened on the outer surfaces of the first rotating rod (31) and the second rotating rod (32). The third guide groove (37) passes through the external thread (42). The positioning block (27) and the mating block (34) are rotatably sleeved with a driving helical gear (38). The driving helical gear (38) is engaged with the third guide groove (37). The outer surface of the driving helical gear (38) is meshed with a driven helical gear (39). One end of the transmission chain (40) is fixedly connected to the end face of the driven helical gear (39). The other end of the transmission chain (40) is fixedly connected to the rotating shaft (41).

7. A welding device for butt welding of metal pipes according to claim 6, characterized in that: The top surface of the first cutting tool (29) is flush with the bottom surface of the positioning block (27), and the bottom surface of the second cutting tool (36) is tangent to the movement trajectory of the chuck (19).

8. A welding device for butt welding of metal pipes according to claim 6, characterized in that: The positioning block (27) is engaged with the external threads (42) on the first rotating rod (31) and the second rotating rod (32). The driving helical gear (38) inside the positioning block (27) is sleeved with the second rotating rod (32). The driving helical gear (38) inside the mating block (34) is sleeved with the first rotating rod (31). The vertical height difference between the external thread (42) on the first rotating rod (31) and the bottom surface of the positioning block (27) is... The vertical height difference between the external thread (42) on the second rotating rod (32) and the bottom surface of the second cutting tool (36) .

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