Small-diameter flange welding tool

Abstract

This application discloses a welding fixture for small-diameter flanges, belonging to the technical field of small-diameter flanges. It mainly includes a drive cylinder with an output shaft; an adjusting plate; a sliding groove formed on the adjusting plate, in which a slider is slidably connected, connected to the output shaft, and the drive cylinder used to drive the slider to move laterally; a locking mechanism comprising: two sets of circularly opposed arc plates rotatably connected to the slider, with a chuck mounted at the other end of the two sets of arc plates, the lateral movement of the slider suitable for moving the two sets of arc plates and the chuck; a support plate rotatably connected to one side of the adjusting plate, with baffles mounted on both the upper and lower sides of the support plate; and a support mechanism for supporting the connecting pipe. The locking mechanism and the support mechanism are coaxially arranged. This small-diameter flange welding fixture reduces pre-welding preparation steps, ensures coaxial arrangement of the pipe diameter and flange, prevents flange misalignment, and enables rapid batch processing.

Description

Technical Field

[0001] This application relates to the field of small-diameter flange welding technology, specifically to a small-diameter flange welding fixture. Background Technology

[0002] In industrial pipeline installation (especially in petrochemical, power, fine chemical, and instrumentation pipeline fields), it is often necessary to weld small-diameter pipes to flanges for ease of use.

[0003] Small-diameter flange welding fixtures mainly adopt two welding methods: one is butt welding, which is welding on one side, specifically, the pipe and the flange are joined face to face and welded.

[0004] The second method is welding on both the inside and outside of the flange, that is, welding on both sides. Specifically, the pipe is inserted into the socket of the flange, the connection between the outer wall of the pipe and the flange is welded first, and then the connection between the pipe and the inner wall of the flange hole is welded, thereby welding the two connection ends of the flange and the pipe to improve the sealing effect.

[0005] When using the two-sided welding method on flanges, although the flange is fitted onto the pipe, there is still a gap between the flange and the pipe to ensure that the welding wire can smoothly enter the gap to achieve a good connection between the flange and the pipe.

[0006] Therefore, traditional welding methods typically use a right-angle ruler and feeler gauge to measure four symmetrical weld points of the same length starting from the three, six, nine, and twelve o'clock positions on the flange. Then, the pipe is fitted onto the flange. Subsequently, two workers are required to work together. One person uses a vernier caliper or micrometer to measure the verticality and parallelism of the flange placement to ensure that the pipe diameter and flange are coaxial. Then, the pipe and flange are manually supported and fixed, while the other person uses a welding torch to weld and position the four weld points before welding the whole thing.

[0007] However, traditional welding methods require a high level of worker experience and involve cumbersome steps. They require measurement and fixation before welding, and may need to be adjusted multiple times in between, making it difficult to achieve rapid batch operations. Furthermore, human operation based on experience has a large margin of error, which can easily lead to misalignment between the pipe diameter and the flange, or misalignment of the flange, requiring subsequent adjustments and affecting welding efficiency. Therefore, it is necessary to provide a small-diameter flange welding fixture to solve the above problems. Summary of the Invention

[0008] According to one aspect of this application, a welding fixture for small-diameter flanges is provided, which reduces the preparation steps before welding, ensures that the pipe diameter and flange are set coaxially, prevents the flange from being misaligned, and enables rapid batch operations.

[0009] The technical solution adopted by this application to solve its technical problem is: a small-diameter flange welding fixture for welding corresponding connecting pipes and flanges, the welding fixture including a base, on which the following are mounted:

[0010] A welding assembly includes a two-axis adjustment structure and a welding torch mounted on the two-axis adjustment structure, the two-axis adjustment structure being used to adjust the position of the welding torch based on welding requirements;

[0011] A workpiece adjustment assembly, the workpiece adjustment assembly including at least a rotating mechanism, the rotating mechanism being located on one side of the welding assembly, for supporting and driving the assembled connecting pipe and the flange to be welded to rotate during welding;

[0012] An axial positioning adjustment assembly, located above the workpiece adjustment assembly, includes an adjustment mechanism and a flange positioning mechanism and a connecting pipe positioning mechanism connected to each other. The adjustment mechanism is used to coaxially link the flange positioning mechanism and the connecting pipe positioning mechanism, and to provide positioning support from the inside of the connecting pipe and the flange respectively, so as to realize the coaxial assembly of the two.

[0013] Optionally, the adjustment mechanism includes:

[0014] A drive cylinder having an output shaft;

[0015] An adjustment plate, which, along with the drive cylinder, is mounted above the base;

[0016] A sliding groove is provided on the adjustment plate, and a slider is slidably connected in the sliding groove. The slider is connected to the output shaft, and the drive cylinder is used to drive the slider to move laterally.

[0017] The flange positioning mechanism is disposed above the rotating mechanism, and the flange positioning mechanism has:

[0018] Two sets of opposing arc plates are rotatably connected to the slider. The two sets of arc plates pass through the side of the adjusting plate away from the driving cylinder. A chuck is installed at the other end of the two sets of arc plates. The movement of the slider is adapted to drive the two sets of arc plates and the chuck to move.

[0019] A support plate is rotatably connected to one side of the adjusting plate. Baffles are installed on both the upper and lower sides of the support plate. Each of the two sets of baffles is provided with a locking component, which is used to support and fix the flange.

[0020] Optionally, a connecting ring is installed on the side of the slider near the driving cylinder. The connecting ring is sleeved on the output shaft. A magnet ring is fixedly installed on the outer wall of the output shaft. A magnet is installed on the inner wall of the connecting ring. The magnet and the magnet ring attract each other. A return spring is fixedly installed between the side of the slider near the flange positioning mechanism and the adjusting plate.

[0021] Optionally, the upper surface of the slider is provided with a circulation guide groove, the circulation guide groove includes a first groove vertically formed on the slider, the upper end of the adjusting plate is rotatably connected to a locking rod, the other end of the locking rod is fixedly installed with a spring pin, and the spring pin is located inside the first groove;

[0022] A second slide groove is provided on the side of the first slide groove near the drive cylinder, and a first arc angle is provided at the connection between the second slide groove and the first slide groove. A third slide groove is provided on the side of the second slide groove away from the first slide groove, and a second arc angle is provided at the connection between the third slide groove and the second slide groove.

[0023] The depth of the first arc angle is the same as the depth of the second slide groove. The depth of the first slide groove is less than the depth of the second slide groove, forming a depth difference. A third slide groove is provided on the side of the second slide groove away from the first slide groove. A second arc angle is provided at the connection between the third slide groove and the second slide groove. The depth of the second arc angle is the same as the depth of the third slide groove. The depth of the second slide groove is less than the depth of the third slide groove, forming a depth difference.

[0024] Optionally, a fourth slide groove is provided on the side of the third slide groove away from the second slide groove. The fourth slide groove is divided into a first section and a second section. The depth of the fourth slide groove gradually decreases from the first section to the second section. A third arc angle is provided at the connection between the fourth slide groove and the third slide groove.

[0025] The depth of the third arc angle is the same as the depth of the first section of the fourth slide groove. The depth of the third slide groove is less than the depth of the first section of the fourth slide groove, forming a depth difference. The second section of the fourth slide groove is inclinedly connected to the first slide groove. The depth of the second section of the fourth slide groove is less than the depth of the first slide groove.

[0026] The overall width of the chuck is consistent with the horizontal distance between the end of the first groove away from the first arc angle and the third arc angle.

[0027] Optionally, the engaging member has a screw slidably connected to the baffle, a baffle plate is fixedly installed at one end of the screw near the chuck, an adjusting wheel is hinged to the other side of the baffle plate, and a compression spring is fixedly installed between the baffle plate and the baffle plate, the compression spring being sleeved on the outside of the screw.

[0028] Optionally, a fixing block is sleeved on the screw, a clamping plate is fixedly installed on one side of the fixing block, and an upper nut and a lower nut are threadedly connected to the screw, with the upper nut and the lower nut located on the upper and lower sides of the fixing block, respectively.

[0029] The distance between the adjusting wheel and the baffle is greater than the vertical height between the inner wall of the chuck's inner ring and the arc surface of the chuck, and the distance between the chuck plate and the inner wall of the flange is the same as the vertical height between the inner wall of the chuck's inner ring and the arc surface of the chuck.

[0030] Optionally, the connecting pipe positioning mechanism has a support rod rotatably connected to one side of the adjusting plate. The support rod is located inside the two sets of arc plates and the chuck, and the support rod is coaxially arranged with the two sets of arc plates and the chuck.

[0031] A second fixing ring is fixedly installed at the other end of the support rod. A threaded bushing is slidably connected to the support rod. A first fixing ring is fitted on the threaded bushing. A third nut and a fourth nut are threadedly connected to the threaded bushing. The third nut and the fourth nut are respectively located on both sides of the first fixing ring.

[0032] Optionally, adjusting members are respectively provided on both sides of the first fixing ring and the second fixing ring. The adjusting member has a first rotating arm hinged to one side of the second fixing ring, and a second rotating arm hinged to the same side of the first fixing ring. A top plate is provided on the other side of the first rotating arm and the second rotating arm. The top plate is arc-shaped, and a hinge column is fixedly installed on the inner wall of the top plate. The first rotating arm and the second rotating arm are rotatably connected to the hinge column.

[0033] Optionally, the distance between the threaded bushing and the engaging member is the same as the width of the chuck, and the distance the threaded bushing moves is the same as the lateral horizontal distance between the first arc angle and the third arc angle.

[0034] The beneficial effects that this application can produce include:

[0035] The small-diameter flange welding fixture provided in this application uses an adjustment mechanism to drive a locking mechanism and a support mechanism to ensure the flange and connecting pipe are coaxial and provide support, thereby reducing the preparation steps before welding, eliminating the need for measurement and fixing before welding, reducing the experience requirements of workers, and ensuring that the pipe diameter and flange are set coaxially to prevent the flange from being skewed, thereby improving welding efficiency and enabling rapid batch operations. Attached Figure Description

[0036] Figure 1 This is an overall schematic diagram of a small-diameter flange welding fixture according to this application;

[0037] Figure 2 for Figure 1 A schematic diagram of the main structure without flanges and connecting pipes installed;

[0038] Figure 3 for Figure 2 A separate schematic diagram of the central adjustment mechanism;

[0039] Figure 4 for Figure 3 A schematic diagram of the exploded structure of the middle part;

[0040] Figure 5 for Figure 4 A separate enlarged schematic diagram of the middle slider;

[0041] Figure 6 for Figure 3 A schematic diagram of the exploded structure of the middle part;

[0042] Figure 7 for Figure 6 A separate schematic diagram of area A in the middle;

[0043] Figure 8 for Figure 3 A schematic diagram of the clamping state of the overall structure;

[0044] The following are the labeling elements in the figure:

[0045] 1. Base; 11. Ball screw structure; 12. Rotating mechanism; 121. Mounting plate; 122. Driven roller; 123. Drive motor; 124. Driven roller; 13. Two-axis adjustment structure; 14. Flange; 15. Connecting pipe; 16. Welding torch; 17. Bracket; 18. Support plate;

[0046] 2. Flange positioning mechanism; 21. Arc plate; 22. Chuck; 23. Support plate; 231. Collar; 232. Horizontal plate; 233. Baffle; 24. Clamping component; 241. Screw; 242. Baffle; 243. Adjusting wheel; 244. Compression spring; 245. Fixing block; 246. Clamping plate; 247. Upper nut; 248. Lower nut;

[0047] 3. Adjustment mechanism; 31. Drive cylinder; 32. Adjustment plate; 321. Sliding groove; 33. Output shaft; 34. Slider; 341. First sliding groove; 342. First arc angle; 343. Second sliding groove; 344. Second arc angle; 345. Third sliding groove; 346. Third arc angle; 347. Fourth sliding groove; 35. Connecting ring; 36. Locking rod; 37. Elastic cylindrical pin;

[0048] 4. Pipe positioning mechanism; 41. Support rod; 42. Second fixing ring; 43. First adjusting component; 44. Second adjusting component; 441. First rotating arm; 442. Top plate; 443. Hinge column; 444. Second rotating arm; 45. First fixing ring; 46. Threaded bushing; 47. Third nut; 48. Fourth nut. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0051] Example 1: This example illustrates the basic structure and principle of welding fixtures for small-diameter flanges, specifically:

[0052] like Figures 1-2 As shown, this application provides a small-diameter flange welding fixture, including a base 1, a welding assembly on the base 1, the welding assembly including a two-axis adjustment structure 13 fixedly installed on the upper end of the base 1, a welding torch 16 installed on the two-axis adjustment structure 13, the welding torch 16 is used to perform welding operations on the connecting pipe 15 and the flange 14, and the installation angle of the welding torch 16 can be rotated and adjusted to adapt to different welding positions;

[0053] In this application, the two-axis adjustment structure 13 is used to drive the welding torch 16 to move vertically and horizontally. The two-axis adjustment structure 13 is prior art. The lifting displacement mechanism and the horizontal displacement mechanism in Chinese Patent Application No. 201910187807.3 can be used. For details, please refer to relevant literature. It will not be elaborated here.

[0054] Meanwhile, a workpiece adjustment assembly is provided at the upper end of the base 1. The workpiece adjustment assembly has a ball screw structure 11 fixedly installed at the upper end of the base 1. The ball screw structure 11 is located below the side of the two-axis adjustment structure 13 with the welding gun 16. A rotating mechanism 12 is provided at the upper end of the ball screw structure 11. The rotating mechanism 12 is used to place the connecting pipe 15 and flange 14 to be welded. The rotating mechanism 12 can drive the connecting pipe 15 and flange 14 to be welded to rotate, which facilitates the welding operation.

[0055] In this application, the ball screw structure 11 is used to drive the rotating mechanism 12 to move laterally, so as to facilitate the adjustment of the position of the flange 14 and the connecting pipe 15 to accommodate welding on both sides of the flange 14. The ball screw structure 11 is prior art and can adopt the screw and nut linear transmission mechanism in Chinese Patent Application No. 202121471486.9. For details, please refer to relevant literature, which will not be elaborated here.

[0056] It should be noted that at least one set of rotating mechanism 12 is provided. During welding operations, multiple sets of rotating mechanism 12 can be selected according to the length of connecting pipe 15, thus adapting to connecting pipes 15 of different lengths.

[0057] The rotating mechanism 12 has a mounting plate 121 mounted on the ball screw structure 11. Two sets of bearing seats (not shown in the figure) are fixedly mounted on the mounting plate 121. Each set of bearing seats has two bearing seats. A drive roller 124 is rotatably connected between the first set of bearing seats, and a driven roller 122 is rotatably connected between the second set of bearing seats. The driven roller 122 is located on one side of the drive roller 124. A drive motor 123 is fixedly mounted on one side of the mounting plate 121. The drive shaft of the drive motor 123 is fixedly mounted on one side of the drive roller 124.

[0058] It should be noted that in this application, the welding torch 16 has a matching program that can control the opening and closing of the welding torch 16. When the welding torch 16 completes the ring welding, the program controls the welding torch 16 to stop. This method is a mature prior art. Alternatively, the welding component method in Chinese Patent Application No. 202311396351.4 can also be adopted.

[0059] Therefore, during welding, the operator measures four symmetrical welding points of the same length from the three, six, nine and twelve o'clock positions of the flange 14, uses a vernier caliper or micrometer to measure the verticality and parallelism of the flange 14, and then manually supports and fixes the connecting pipe 15 to the flange 14, and welds and positions the four welding points first.

[0060] Then, the welded and positioned connecting pipe 15 and flange 14 are placed between the active roller 124 and the driven roller 122. The position of the welding head of the welding gun 16 is adjusted by the two-axis adjustment structure 13 so that it is attached to the connection end between the outer wall of the connecting pipe 15 and the flange 14. At this time, the connecting pipe 15 is attached to the surface of the active roller 124 and the driven roller 122. The drive motor 123 is started to drive the active roller 124 to rotate, so that the connecting pipe 15 and flange 14 rotate at the same time, which facilitates the welding operation of the external weld seam.

[0061] After welding is completed, the welding head of the welding gun 16 is adjusted to the connection end between the end of the connecting pipe 15 and the inner wall of the flange 14 through the ball screw structure 11 and the two-axis adjustment structure 13. Then, the welding gun is started again to complete one round of welding operation on the inner weld, so that the moving speed of the welding gun 16 is consistent, thereby ensuring the continuity of the welding process and avoiding uneven heat input of the weld, thus preventing uneven weld formation.

[0062] Example 2:

[0063] When welding a batch of flanges 14 and connecting pipes 15, a lengthy measurement process is required before each welding operation. This is not only cumbersome and time-consuming, but also prone to errors, leading to misalignment between the pipe diameter and the flange, making batch operations difficult. Furthermore, to ensure welding quality, space must be reserved for solder when welding the inner ends of flanges 14 and connecting pipes 15. To solve the above problems, specifically:

[0064] An axial positioning adjustment assembly is provided above the workpiece adjustment assembly. The axial positioning adjustment assembly includes a flange positioning mechanism 2 located above the rotating mechanism 12. In use, the flange positioning mechanism 2 is located inside the flange 14 and the connecting pipe 15. At the same time, a bracket 17 is fixedly installed at the upper end of the base 1. A support plate 18 is fixedly installed at the upper end of the bracket 17. An adjustment mechanism 3 is provided on the support plate 18. The adjustment mechanism 3 is used to adjust the position of the flange positioning mechanism 2. In this application, the height of the bracket 17 can be adjusted, or it can be set as a telescopic column in the prior art.

[0065] The adjustment mechanism 3 has a drive cylinder 31 and an adjustment plate 32 fixedly installed on the upper end of the support plate 18. The adjustment plate 32 is located between the drive cylinder 31 and the flange positioning mechanism 2.

[0066] like Figures 3-5 As shown, the drive cylinder 31 has an output shaft 33, which is positioned towards the adjustment plate 32. A sliding groove 321 is laterally formed on the adjustment plate 32 along the direction of the output shaft 33. A slider 34 is slidably connected in the sliding groove 321. A connecting ring 35 is fixedly installed on the side of the slider 34 near the drive cylinder 31. The connecting ring 35 is sleeved on the output shaft 33. In this application, a magnet ring is fixedly installed on the outer wall of the output shaft 33. The magnet ring is normally located inside the connecting ring 35. At the same time, a magnet is also installed on the inner wall of the connecting ring 35. The magnet and the magnet ring attract each other. Therefore, when the drive cylinder 31 is activated, the output shaft 33 drives the connecting ring 35 and the slider 34 to slide in the sliding groove 321.

[0067] Meanwhile, a circulation guide groove is provided on the upper surface of the slider 34. The circulation guide groove includes a first slide groove 341 vertically opened on the slider 34. The upper end of the adjusting plate 32 is rotatably connected to a locking rod 36. A spring pin is fixedly installed at the other end of the locking rod 36. The spring pin is normally located inside the first slide groove 341. Therefore, when the slider 34 slides in the slide groove 321 towards the flange positioning mechanism 2, the locking rod 36 drives the spring pin to slide in the first slide groove 341.

[0068] The first slide groove 341 has a second slide groove 343 on one side near the drive cylinder 31. The connection between the second slide groove 343 and the first slide groove 341 is provided with a first arc angle 342. The depth of the first arc angle 342 is the same as the depth of the second slide groove 343, and the depth of the first slide groove 341 is less than the depth of the second slide groove 343, forming a depth difference. Therefore, when the locking rod 36 drives the spring pin to reach the second slide groove 343, it cannot return to the first slide groove 341.

[0069] Furthermore, a third slide groove 345 is provided on the side of the second slide groove 343 away from the first slide groove 341. A second arc angle 344 is provided at the connection between the third slide groove 345 and the second slide groove 343. The depth of the second arc angle 344 is the same as the depth of the third slide groove 345, and the depth of the second slide groove 343 is less than the depth of the third slide groove 345, forming a depth difference. Therefore, when the locking rod 36 drives the spring pin to reach the third slide groove 345, it cannot return to the second slide groove 343.

[0070] Meanwhile, a fourth slide groove 347 is provided on the side of the third slide groove 345 away from the second slide groove 343. For ease of understanding, the fourth slide groove 347 is divided into a first section and a second section, and the depth of the fourth slide groove 347 gradually decreases from the first section to the second section. A third arc angle 346 is provided at the connection between the fourth slide groove 347 and the third slide groove 345. The depth of the third arc angle 346 is the same as the depth of the first section of the fourth slide groove 347. At the same time, the depth of the third slide groove 345 is less than the depth of the first section of the fourth slide groove 347, forming a depth difference. Therefore, after the locking rod 36 drives the spring pin to reach the first section of the fourth slide groove 347, it cannot return to the third slide groove 345.

[0071] The second section of the fourth slide groove 347 is inclinedly connected to the first slide groove 341, and the depth of the second section of the fourth slide groove 347 at the connection end is less than the depth of the first slide groove 341. Therefore, the locking rod 36 can drive the spring pin to return from the fourth slide groove 347 to the first slide groove 341, and cannot return to the fourth slide groove 347.

[0072] It should be noted that, in order to enable the slider 34 to reset quickly, a reset spring (not shown in the figure) is fixedly installed between the side of the slider 34 near the flange positioning mechanism 2 and the adjusting plate 32. When the slider 34 moves toward the flange positioning mechanism 2, the reset spring will be squeezed, and after the thrust on the slider 34 disappears, the slider 34 will reset quickly under the action of the reset spring.

[0073] like Figure 3 and Figures 6-7 As shown, in order to support and fix the flange 14, the flange positioning mechanism 2 has two sets of arc plates 21. The two sets of arc plates 21 are arranged in a circular shape and opposite each other. The two sets of arc plates 21 are installed on the side of the slider 34 away from the connecting ring 35. In this application, a disc is fixedly installed on one end of the two sets of arc plates 21 near the slider 34. The disc is rotatably connected to the slider 34. Therefore, the two sets of arc plates 21 can rotate on the side of the slider 34.

[0074] Meanwhile, the two sets of arc plates 21 pass through the side of the adjusting plate 32 away from the driving cylinder 31, and a chuck 22 is fixedly installed at the other end of the two sets of arc plates 21. Therefore, when the slider 34 slides, it will drive the two sets of arc plates 21 and the chuck 22 to move simultaneously. In this application, the chuck 22 is provided in multiple sets and can be disassembled and replaced. The width of the multiple sets of chucks 22 is the same, only the height is different, which is convenient to adapt to flanges 14 of different sizes.

[0075] The flange positioning mechanism 2 also has a support plate 23, and a collar 231 is fixedly installed at the center of the support plate 23. The collar 231 is sleeved on the outside of the two sets of arc plates 21 and rotatably connected to one side of the adjusting plate 32. Therefore, the support plate 23 can rotate on the side of the adjusting plate 32.

[0076] Horizontal plates 232 are fixedly installed on the upper and lower sides of the support plate 23 at the ends away from the adjusting plate 32. The two sets of horizontal plates 232 are located on the upper and lower sides of the arc plate 21. Baffles 233 are fixedly installed on the other ends of the horizontal plates 232. The baffles 233 are provided with locking parts 24. The two sets of locking parts 24 are arranged opposite to each other and are located on the upper and lower sides of the chuck 22. The two sets of locking parts 24 are used to support and fix the flange 14. In this application, the structure and installation method of the two sets of locking parts 24 are the same. The following description will be based on one set as an example. Specifically:

[0077] The engaging component 24 has a screw 241 that is slidably connected to the baffle 233. A baffle 242 is fixedly installed at one end of the screw 241 near the chuck 22. An adjusting wheel 243 is hinged to the other side of the baffle 242. A compression spring 244 is fixedly installed between the baffle 233 and the baffle 242. The compression spring 244 is sleeved on the outside of the screw 241.

[0078] Meanwhile, a fixing block 245 is sleeved on the screw 241. A clamping plate 246 is fixedly installed on the side of the fixing block 245 away from the horizontal plate 232. The clamping plate 246 is arc-shaped. An upper nut 247 and a lower nut 248 are threadedly connected to the screw 241. The upper nut 247 and the lower nut 248 are located on the upper and lower sides of the fixing block 245, respectively, for fixing the fixing block 245.

[0079] Therefore, by pushing the adjusting wheel 243 upward, the baffle 242 and the screw 241 will move upward, thereby compressing the compression spring 244. At the same time, the fixing block 245 will also move upward.

[0080] like Figure 3 and Figure 6 As shown, a connecting pipe positioning mechanism 4 is provided on the side of the flange positioning mechanism 2 away from the drive cylinder 31. The connecting pipe positioning mechanism 4 has a support rod 41 rotatably connected to one side of the adjusting plate 32. The support rod 41 is located inside the two sets of arc plates 21 and the chuck 22. It can be understood that the two sets of arc plates 21 are attached to the outer surface of the support rod 41. The support rod 41 is coaxially arranged with the two sets of arc plates 21 and the chuck 22. Therefore, when the slider 34 drives the arc plates 21 and the chuck 22 to rotate, the arc plates 21 and the chuck 22 will slide on the support rod 41.

[0081] To ensure that the connecting pipe 15 and the flange 14 are installed coaxially, a second fixing ring 42 is fixedly installed at the other end of the support rod 41, and a threaded bushing 46 is slidably connected to the support rod 41. A first fixing ring 45 is fitted on the threaded bushing 46. It can be understood that the first fixing ring 45 is only fitted on the outside of the threaded bushing 46 and will not be affected by the threads on the threaded bushing 46.

[0082] In order to fix the first fixing ring 45, a third nut 47 and a fourth nut 48 are threadedly connected to the threaded bushing 46. The third nut 47 and the fourth nut 48 are respectively set on both sides of the first fixing ring 45. The first fixing ring 45 is fixed by the third nut 47 and the fourth nut 48. The position of the first fixing ring 45 on the threaded bushing 46 can be adjusted by rotating the third nut 47 and the fourth nut 48 to accommodate connecting pipes 15 of different sizes.

[0083] A first adjusting member 43 and a second adjusting member 44 are respectively provided on both sides of the first fixing ring 45 and the second fixing ring 42. In this application, the structure and installation method of the first adjusting member 43 and the second adjusting member 44 are the same. For ease of understanding, the following description takes the second adjusting member 44 as an example. Specifically:

[0084] The second adjusting member 44 has a first rotating arm 441 hinged to one side of the second fixed ring 42, and a second rotating arm 444 hinged to the same side of the first fixed ring 45. A top plate 442 is provided on the other side of the first rotating arm 441 and the second rotating arm 444. The top plate 442 is arc-shaped, and a hinge column 443 is fixedly installed on the inner wall of the top plate 442. The ends of the first rotating arm 441 and the second rotating arm 444 away from the support rod 41 are rotatably connected to the hinge column 443. Therefore, pushing the threaded bushing 46 can cause the first fixed ring 45 to push the second rotating arm 444 to rotate towards the second fixed ring 42, and at the same time, it will cause the first rotating arm 441 to rotate. The top plate 442 is pushed outward and opened by the first rotating arm 441 and the second rotating arm 444.

[0085] It should be noted that the adjusting wheel 243 is initially attached to the surface of the support rod 41, while the chuck 22 has two ends. The end away from the arc plate 21 is set as an arc angle, and the other end is set as a parallel arc surface. Therefore, when the chuck 22 moves, the adjusting wheel 243 can be easily pushed upward by the arc angle.

[0086] In this application, the distance between the adjusting wheel 243 and the baffle 233 is greater than the vertical height between the inner wall of the inner ring of the chuck 22 and the arc surface of the chuck 22, and the distance between the chuck 246 and the inner wall of the flange 14 is the same as the vertical height between the inner wall of the inner ring of the chuck 22 and the arc surface of the chuck 22.

[0087] In this application, such as Figure 3 As shown, the chuck 22 is initially located to the side of the adjusting wheel 243, and the overall width of the chuck 22 is consistent with the horizontal distance between the end of the first slide groove 341 away from the first arc angle 342 and the third arc angle 346. Therefore, when the slider 34 moves, when the elastic cylindrical pin 37 on the chuck 36 moves from the first slide groove 341 to the second arc angle 344, the chuck 22 will push the adjusting wheel 243 to the parallel arc surface of the chuck 22. And when the slider 34 slides to the limit position, the adjusting wheel 243 will not disengage from the parallel arc surface of the chuck 22.

[0088] In this application, the distance between the threaded bushing 46 and the adjusting wheel 243 is the same as the width of the chuck 22.

[0089] In this application, the movement of the threaded bushing 46 can cause the top plate 442 to open and press against the inner wall of the connecting pipe 15. During this process, the distance that the threaded bushing 46 moves is a fixed distance, which is consistent with the lateral horizontal distance of the first arc angle 342 and the third arc angle 346.

[0090] It should be noted that before using the same batch of materials for mass welding, the operators will conduct adjustments to ensure that the distance between the components is consistent as described above, and will also conduct regular spot checks and tests to ensure that the data is correct.

[0091] During debugging, such as Figure 8 As shown, the flange positioning mechanism 2 and the connecting pipe positioning mechanism 4 are adjusted to be fully extended. Then, the positions of the fixing block 245 and the first fixing ring 45 are adjusted so that the clamping plate 246 can be clamped onto the inner wall of the flange 14 and the top plate 442 can be pressed against the inner wall of the connecting pipe 15. At the same time, the chuck 22 of a suitable height is selected, thereby restoring the device to the initial state for batch use and adapting to welding operations of flanges 14 and connecting pipes 15 of different sizes.

[0092] In summary: When welding the flange 14 and the connecting pipe 15, after the device is debugged and restored to its initial state, the flange 14 is placed on one side of the two sets of locking parts 24, the drive cylinder 31 is started, and the drive cylinder 31 drives the output shaft 33 to push outward, while pushing the slider 34 to move and squeezing the return spring.

[0093] At the same time, the elastic cylindrical pin 37 will move along the first slide groove 341 until it reaches the first arc angle 342. At this time, the locking rod 36 will lock the slider 34 through the elastic cylindrical pin 37, so that the slider 34 stops sliding, while the output shaft 33 continues to move and disengages from the connecting ring 35.

[0094] At this time, the slider 34 no longer has the pushing force to reset the return spring, and pushes the slider 34 in the opposite direction, so that the elastic cylindrical pin 37 slides along the second slide groove 343 and is locked in the second arc angle 344;

[0095] At the same time, the movement of slider 34 drives the arc plate 21 and chuck 22 to move, which pushes the adjusting wheel 243 upward, causing the screw 241 to drive the fixing block 245 upward until the clamping plate 246 presses against the inner wall of flange 14. At this time, the operator pushes flange 14 inward so that its side presses against the surface of fixing block 245, thereby ensuring that flange 14 is placed vertically. The clamping plate 246 can also reserve space for solder when welding flange 14 and inner end of connecting pipe 15, without the need for manual measurement and pre-layout.

[0096] When the elastic cylindrical pin 37 moves from the first arc angle 342 to the second arc angle 344, it will cause the slider 34 to move in the opposite direction. At this time, the adjusting wheel 243 is located at the parallel arc surface of the chuck 22, which will not affect the height position, thus completing the fixation of the flange 14.

[0097] Subsequently, the operator inserts the connecting pipe 15 into the flange 14 and attaches it to the surface of the clamping plate 246. Then, the drive cylinder 31 is retracted and restarted. During this process, the output shaft 33 and the connecting ring 35 are re-adsorbed and fixed, and the slider 34 continues to slide outward. The elastic cylindrical pin 37 will continue to slide along the third slide groove 345 to the third arc angle 346, which is the output limit position of the drive cylinder 31. At this time, the slider 34 also stops sliding.

[0098] At the same time, the chuck 22 continues to move and pushes the threaded bushing 46 outward along the support rod 41, causing the first adjusting member 43 and the second adjusting member 44 to rotate and open the top plate 442 outward, thereby supporting the connecting pipe 15. At this time, the simultaneous support of the flange 14 and the connecting pipe 15 is completed, ensuring that the two are placed coaxially and that the flange 14 is placed vertically.

[0099] Then, the rotating mechanism 12 is used to drive the flange 14 and the connecting pipe 15, as well as the flange positioning mechanism 2 and the connecting pipe positioning mechanism 4 to rotate simultaneously, so as to complete one round of welding operation on the outer weld of the flange 14 and the connecting pipe 15.

[0100] After welding is completed, the flange positioning mechanism 2 is retracted through the adjustment mechanism 3. At this time, the threaded bushing 46 will loosen and slide in the opposite direction on the support rod 41 without the thrust, thus canceling the support for the connecting pipe 15. The connecting pipe positioning mechanism 4 is then retracted. The welding head of the welding gun 16 is then adjusted to the connection end between the end of the connecting pipe 15 and the inner wall of the flange 14 through the ball screw structure 11 and the two-axis adjustment structure 13. Then, the welding is continued to complete the welding operation of the inner weld seam. The flange 14 and connecting pipe 15 after welding are removed, and the above operation is repeated to continue welding the next set of flanges 14 and connecting pipes 15.

[0101] This reduces the preparation steps before welding, eliminates the need for measurement and fixing before welding, lowers the experience requirements for workers, and ensures that the pipe diameter and flange are set coaxially, preventing the flange 14 from becoming misaligned, thus improving welding efficiency and enabling rapid batch operations.

[0102] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A small-diameter flange welding fixture for welding corresponding connecting pipes (15) and flanges (14), characterized in that: The welding fixture includes a base (1), on which are mounted: The welding assembly includes a two-axis adjustment structure (13) and a welding torch (16) mounted on the two-axis adjustment structure (13), the two-axis adjustment structure (13) being used to adjust the position of the welding torch (16) based on welding requirements; The workpiece adjustment assembly includes at least a rotating mechanism (12), which is located on one side of the welding assembly and is used to support and drive the assembled connecting pipe (15) and the flange (14) to be welded to rotate during welding. An axial positioning adjustment assembly is located above the workpiece adjustment assembly. It includes an adjustment mechanism (3) and a flange positioning mechanism (2) and a connecting pipe positioning mechanism (4) connected to each other. The adjustment mechanism (3) is used to coaxially link the flange positioning mechanism (2) and the connecting pipe positioning mechanism (4) to provide positioning support from the inside of the connecting pipe (15) and the flange (14) respectively, so as to realize the coaxial assembly of the two. The adjustment mechanism (3) includes: A drive cylinder (31) having an output shaft (33); An adjusting plate (32) and the driving cylinder (31) are mounted above the base (1); A sliding groove (321) is provided on the adjusting plate (32). A slider (34) is slidably connected in the sliding groove (321). The slider (34) is connected to the output shaft (33). The driving cylinder (31) is used to drive the slider (34) to move laterally. The flange positioning mechanism (2) is disposed above the rotating mechanism (12), and the flange positioning mechanism (2) has: Two sets of opposing arc plates (21) are rotatably connected to the slider (34). The two sets of arc plates (21) pass through the side of the adjusting plate (32) away from the driving cylinder (31). A chuck (22) is installed at the other end of the two sets of arc plates (21). The slider (34) moves to drive the two sets of arc plates (21) and the chuck (22) to move. A support plate (23) is rotatably connected to one side of the adjusting plate (32). Baffles (233) are installed on both the upper and lower sides of the support plate (23). Each of the two sets of baffles (233) is provided with a locking component (24). The two sets of locking components (24) are used to support and fix the flange (14). A connecting ring (35) is installed on the side of the slider (34) near the drive cylinder (31). The connecting ring (35) is sleeved on the output shaft (33). A magnet ring is fixedly installed on the outer wall of the output shaft (33). A magnet is installed on the inner wall of the connecting ring (35). The magnet and the magnet ring attract each other. A return spring is fixedly installed between the side of the slider (34) near the flange positioning mechanism (2) and the adjusting plate (32). The upper surface of the slider (34) is provided with a circulation guide groove, which includes a first groove (341) vertically opened on the slider (34). The upper end of the adjusting plate (32) is rotatably connected to a locking rod (36), and the other end of the locking rod (36) is fixedly installed with a spring pin, which is located inside the first groove (341). The first slide groove (341) has a second slide groove (343) on the side near the drive cylinder (31), and a first arc angle (342) is provided at the connection between the second slide groove (343) and the first slide groove (341). The second slide groove (343) has a third slide groove (345) on the side away from the first slide groove (341), and a second arc angle (344) is provided at the connection between the third slide groove (345) and the second slide groove (343). The depth of the first arc angle (342) is the same as the depth of the second slide groove (343). The depth of the first slide groove (341) is less than the depth of the second slide groove (343) and a depth difference is formed. A third slide groove (345) is provided on the side of the second slide groove (343) away from the first slide groove (341). A second arc angle (344) is provided at the connection between the third slide groove (345) and the second slide groove (343). The depth of the second arc angle (344) is the same as the depth of the third slide groove (345). The depth of the second slide groove (343) is less than the depth of the third slide groove (345) and a depth difference is formed. The third slide groove (345) has a fourth slide groove (347) on the side away from the second slide groove (343). The fourth slide groove (347) is divided into a first section and a second section. The depth of the fourth slide groove (347) gradually decreases from the first section to the second section. A third arc angle (346) is provided at the connection between the fourth slide groove (347) and the third slide groove (345). The depth of the third arc angle (346) is consistent with the depth of the first section of the fourth slide groove (347). The depth of the third slide groove (345) is less than the depth of the first section of the fourth slide groove (347) and forms a depth difference. The second section of the fourth slide groove (347) is inclinedly connected to the first slide groove (341). The depth of the second section of the fourth slide groove (347) is less than the depth of the first slide groove (341). The overall width of the chuck (22) is consistent with the horizontal distance between the end of the first groove (341) away from the first arc angle (342) and the third arc angle (346); The engaging component (24) has a screw (241) slidably connected to the baffle (233). A baffle (242) is fixedly installed at one end of the screw (241) near the chuck (22). An adjusting wheel (243) is hinged to the other side of the baffle (242). A compression spring (244) is fixedly installed between the baffle (233) and the baffle (242). The compression spring (244) is sleeved on the outside of the screw (241). A fixing block (245) is sleeved on the screw (241), and a clamping plate (246) is fixedly installed on one side of the fixing block (245). An upper nut (247) and a lower nut (248) are threadedly connected to the screw (241). The upper nut (247) and the lower nut (248) are located on the upper and lower sides of the fixing block (245), respectively. The distance between the adjusting wheel (243) and the baffle (233) is greater than the vertical height between the inner wall of the inner ring of the chuck (22) and the arc surface of the chuck (22). The distance between the chuck plate (246) and the inner wall of the flange (14) is the same as the vertical height between the inner wall of the inner ring of the chuck (22) and the arc surface of the chuck (22).

2. The welding fixture for small-diameter flanges according to claim 1, characterized in that: The connecting pipe positioning mechanism (4) has a support rod (41) rotatably connected to one side of the adjusting plate (32). The support rod (41) is located inside the two sets of arc plates (21) and the chuck (22). The support rod (41) is coaxially arranged with the two sets of arc plates (21) and the chuck (22). The other end of the support rod (41) is fixedly installed with a second fixing ring (42). A threaded bushing (46) is slidably connected to the support rod (41). A first fixing ring (45) is fitted on the threaded bushing (46). A third nut (47) and a fourth nut (48) are threadedly connected to the threaded bushing (46). The third nut (47) and the fourth nut (48) are respectively located on both sides of the first fixing ring (45).

3. The welding fixture for small-diameter flanges according to claim 2, characterized in that: Adjusting members are provided on both sides of the first fixing ring (45) and the second fixing ring (42). The adjusting members have a first rotating arm (441) hinged to one side of the second fixing ring (42), and a second rotating arm (444) hinged to the same side of the first fixing ring (45). A top plate (442) is provided on the other side of the first rotating arm (441) and the second rotating arm (444). The top plate (442) is arc-shaped. A hinge column (443) is fixedly installed on the inner wall of the top plate (442). The first rotating arm (441) and the second rotating arm (444) are rotatably connected to the hinge column (443).

4. The welding fixture for small-diameter flanges according to claim 3, characterized in that: The distance between the threaded bushing (46) and the engaging member (24) is the same as the width of the chuck (22), and the distance the threaded bushing (46) moves is the same as the horizontal distance between the first arc angle (342) and the third arc angle (346).

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