A welding device for LNG air-cooled heat exchange circulating pipe

Abstract

The application discloses a welding device for LNG air-cooled heat exchange circulating pipes, relates to the technical field of circulating pipe welding processing, and solves the technical problem that fixed branch pipes and movable branch pipes cannot be quickly fixed and butt-jointed during welding. The welding device comprises a welding machine main body, a main sliding frame is arranged on the welding machine main body, a driving shaft is connected to the main sliding frame, a driving frame is welded to the driving shaft, an adjusting arm is hinged to the driving frame, an adjusting shaft is hinged to the adjusting arm, a sliding rod is arranged at one end of the adjusting shaft, a limiting sliding groove is formed in the main sliding frame, a clamping frame is welded to the sliding rod, a sliding frame plate is connected to the main sliding frame, a bending rack is slidably arranged on the inner side of the sliding frame plate, a bending gear is arranged on the inner side of the main sliding frame, a handle is coaxially arranged on the bending gear, a ring-shaped fixing frame is welded to the bending rack, a ring-shaped groove is formed in the ring-shaped fixing frame, and a ring-shaped sliding frame is slidably connected to the ring-shaped groove. The application can efficiently compensate for processing errors by assisting in bending the one end of the movable branch pipe, and is more suitable for use in narrow spaces.

Description

Technical Field

[0001] The invention relates to the technical field of circulation pipe welding processing, in particular to a welding device for LNG air-cooled heat exchange circulation pipes. Background Art

[0002] Welding is a processing method that uses heat or pressure, or both, to achieve atomic bonding of welded parts. It is widely used in industrial manufacturing, construction, aerospace and other fields.

[0003] LNG (liquefied natural gas) air-cooled heat exchange circulation pipe is a key component in LNG cryogenic systems that uses air convection to achieve heat exchange. It is mainly used for LNG gasification, temperature regulation or system heat dissipation. It is arranged in parallel through multiple straight pipes, and the inlet and outlet are connected by fixed branch pipes. It is suitable for modular combination (such as multiple fixed branch pipes in parallel) and is uniformly connected to two main pipes on the outside (the two main pipes are used for feeding and discharging respectively).

[0004] The welding environment of LNG air-cooled heat exchange circulation pipes is that multiple rows of fixed branch pipes are welded in parallel at the end of the air-cooled exchanger, and corresponding multiple rows of movable branch pipes are welded inside the main pipe. The difficulty lies in welding multiple rows of fixed pipes and multiple rows of movable branch pipes.

[0005] Currently, when connecting the movable branch pipe to the main pipe, it is necessary to open a reserved hole in the main pipe surface in advance according to the size requirements, then pass the movable branch pipe through the main pipe, and then match the movable branch pipe on the main pipe to the fixed branch pipe welded on one side of the air-cooled exchanger one by one, and then perform welding processing on them.

[0006] Due to the influence of welding environment and existing welding technology, there will be deviations in the reserved holes processed by workers. The deviated reserved holes will cause the movable branch pipes to be misaligned with the fixed branch pipes, resulting in the fixed branch pipes and the movable branch pipes not being able to fully correspond during welding. At this time, manual bending is required to assist in the correspondence, but the cramped environment will affect the efficiency and safety of manual bending.

[0007] Furthermore, when welding the main pipe, due to its large mass, it is difficult to position and adjust it, which affects the efficiency of the actual welding work.

[0008] At the same time, in order to address the above-mentioned problem of cramped environment, welding surface grinding is an indispensable step. Workers are required to use sandpaper to grind the welding parts in a narrow space every time. However, there are many dead corners in the welding surface grinding in a cramped environment, and metal debris can easily cause harm to workers.

[0009] On this basis, the present invention provides a welding device for LNG air-cooled heat exchange circulation pipes to solve the above problems. Summary of the Invention

[0010] In view of the above, in order to overcome the defects of the prior art, the present application provides a welding device for LNG air-cooled heat exchange circulating pipe, which is ingenious in structure and practical in use, effectively solves the problems of unable to quickly fix the butt joint of the branch pipe and the movable branch pipe, difficult to conveniently support and position the main pipe with large quality, and low polishing efficiency and poor safety caused by many polishing dead angles of the welding surface.

[0011] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0012] A welding device for LNG air-cooled heat exchange circulating pipe, comprising a welding machine main body, characterized in that a main sliding frame is arranged on the welding machine main body, a drive shaft is rotatably connected to one side of the main sliding frame, a drive frame is welded to the surface of the drive shaft, adjusting arms are hingedly connected to the inside of both sides of the drive frame, an adjusting shaft is hingedly connected to one side of the adjusting arm, a sliding rod is welded to one end of the adjusting shaft, two symmetrical limiting sliding grooves are formed in the inside of the main sliding frame, the sliding rod is slidably connected in the limiting sliding groove, a clamping frame is welded to one end of the sliding rod, the main sliding frame is further integrally connected with a sliding frame plate, a bending rack is slidably connected to the inner side of the sliding frame plate, a bending gear meshing with the bending rack is rotatably installed on the inner side of the main sliding frame, a handle is coaxially welded to the bending gear, a ring-shaped fixing frame is welded to one end of the bending rack, a ring-shaped groove is formed in the inside of the ring-shaped fixing frame, and a ring-shaped sliding frame is slidably connected in the ring-shaped groove.

[0013] Preferably, a knob is fixedly installed at one end of the drive shaft, and a limiting frame is clamped to the surface of the knob and the inside of the main sliding frame.

[0014] Preferably, a mounting frame is fixedly installed at the bottom of the welding machine main body, a first threaded sleeve is fixedly installed in the inside of the mounting frame, a first screw rod is threadedly connected in the inside of the first threaded sleeve, a first support seat is rotatably connected to the top end of the first screw rod through a bearing, a second threaded sleeve is fixedly installed in the inside of the first support seat, a second screw rod is threadedly connected in the inside of the second threaded sleeve, a second support seat is rotatably connected to the top end of the second screw rod through a bearing, a support arm is fixedly installed on one side of the second support seat, a first swing arm is hingedly connected to the inner side of the support arm, a second swing arm is hingedly connected to the inner side of the first swing arm, a third swing arm is hingedly connected to the inner side of the second swing arm, a rotating telescopic cylinder is welded to one side of the third swing arm, and a connecting frame is rotatably connected to one end of the rotating telescopic cylinder.

[0015] Preferably, a first limiting sleeve is fixedly installed in the inside of the mounting frame, and a first limiting rod fixedly installed at the bottom of the first support seat is slidably connected in the inside of the first limiting sleeve.

[0016] Preferably, a second limiting sleeve is fixedly installed inside the first supporting seat, and a second limiting rod fixedly installed on the bottom of the second supporting seat is slidably connected inside the second limiting sleeve.

[0017] Preferably, a main fixing frame is fixedly installed on the inner side of the connecting frame, and the main sliding frame is slidably connected inside the main fixing frame.

[0018] Preferably, a plurality of card slots are provided on the surface of the main fixed frame, an inner slot is provided inside the main sliding frame, a connecting block is slidably connected inside the inner slot, a return spring is fixedly installed between the connecting block and the inner slot, a limiting block is fixedly installed on one side of the connecting block, and a card block that is clamped inside the card slot is fixedly installed on one side of the limiting block.

[0019] Preferably, a cleaning frame is fixedly installed on one side of the main sliding frame, and a traction rack is slidably connected to the inside of the cleaning frame. An extension block is fixedly connected to one side of the traction rack, and a connecting rod is slidably connected to the inside of the extension block. A scraper head is fixedly installed on one end of the connecting rod, and the other end of the connecting rod is fixedly connected to a limiting plate. A limiting spring is fixedly installed between the limiting plate and the extension block, and two positions on the inner side of the cleaning frame close to the opening are rotatably connected to drive gears that mesh with the traction rack.

[0020] Preferably, a driving motor is provided at one end of one of the driving gears, and the driving motor is fixedly mounted on the cleaning frame.

[0021] Preferably, the inner side of the cleaning frame is rotatably connected to a limiting shaft, and there are three groups of limiting shafts, with two limiting shafts in each group. The driving gear and the surfaces of the three groups of limiting shafts are all connected with transmission belts.

[0022] The present invention has the following technical effects.

[0023] 1. The present invention drives the driving frame to rotate by turning the knob, and the two sides of the driving frame respectively drive the two adjustment arms to rotate in different directions, and at the same time pull the two adjustment shafts, the sliding rod and the clamping frame inward, and the clamping frame clamps the movable branch pipe, which can stably clamp and fix the movable branch pipe, and cooperate with the rotating handle to drive the bending gear to rotate, thereby driving the bending rack, the annular fixing frame and the annular sliding frame to move. The annular fixing frame or the annular sliding frame contacts and pushes the movable branch, and performs auxiliary bending processing on one end of the movable branch, which can effectively compensate for the processing error, has higher accuracy than bending and docking before welding, and is more labor-saving than bending and docking after welding, and is more suitable for use in cramped spaces.

[0024] 2. The present invention rotates the first screw rod to cooperate with the first threaded sleeve in a fixed position, thereby driving the first screw rod, the first support seat and the second support seat to rotate. At the same time, the second screw rod can also be rotated as needed to cooperate with the second threaded sleeve in a relatively fixed position, thereby driving the second screw rod and the second support seat to adjust and rise to a suitable height, thereby providing limited support for the main pipe, and being able to support and position the welded main pipe with a large mass.

[0025] 3. The present invention works by driving a motor to drive a driving gear corresponding to the driving motor to rotate. The corresponding driving gear rotates in one direction, and with the help of a transmission belt and three sets of limit shafts, drives the other driving gear to rotate in the same direction. At this time, the two driving gears simultaneously drive the traction rack to rotate in the opposite direction, so that when one of the driving gears disengages from the traction rack, the other can continue to drive, driving the scraper head to continuously clean and polish around the welding position, reducing the operation of manual polishing of the welding surface in a cramped environment. The non-closed structure realizes annular polishing, which can achieve polishing without affecting the separation between the structure and the movable branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 .

[0028] Figure 2 It is a schematic structural diagram of a side cross-section of the present invention.

[0029] Figure 3 It is a side view cross-section and an enlarged structural schematic diagram of point A of the present invention.

[0030] Figure 4 It is a schematic structural diagram of a side cross-section of the present invention.

[0031] Figure 5 for Figure 4 Schematic diagram of the structure at point B.

[0032] Figure 6 for Figure 4 Schematic diagram of the structure at point C in the middle.

[0033] Figure 7 Schematic diagram of the three-dimensional structure of the present invention Figure 2 .

[0034] Figure 8 for Figure 7 Schematic diagram of the structure at point D in the middle.

[0035] Figure 9It is a rear view and an enlarged structural schematic diagram of E of the present invention.

[0036] Figure 10 It is a three-dimensional schematic diagram of the main sliding frame of the present invention.

[0037] Reference numerals:

[0038] 1. Air-cooling structure body; 2. Fixed branch pipe; 3. Movable branch pipe; 4. Main pipe; 5. Welding machine body; 6. Mounting frame; 7. First screw rod; 8. First threaded sleeve; 9. First limiting sleeve; 10. First limiting rod; 11. Second screw rod; 12. Second threaded sleeve; 13. Second limiting sleeve; 14. First support seat; 15. Second support seat; 16. Cleaning frame; 17. Conveyor belt; 18. Limiting shaft; 19. Driving gear; 21. Driving motor; 22. Traction rack; 23. Extension block; 24. Scraper head; 25. Limiting spring; 26. Connecting rod; 27. Limiting plate; 28. Handle; 29. ​​Bending gear; 30. Bending rack; 31. Annular fixing frame; 32. Annular groove; 33. Annular sliding frame; 34. Limiting frame; 35. Knob; 36. Driving shaft; 37. Driving frame; 38. Adjusting arm; 39. Adjusting shaft; 40. Limiting slide groove; 41. Sliding rod; 42. Clamping frame; 43. Slot; 44. Block; 45. Limiting block; 46. Inner groove; 47. Return spring; 48. Connecting block; 49. Connecting frame; 50. Main sliding frame; 51. Main fixing frame; 52. First swing arm; 53. Second swing arm; 54. Third swing arm; 55. Rotating telescopic cylinder; 56. Second limiting rod; 57. Support arm; 58. Sliding frame plate. DETAILED DESCRIPTION

[0039] The above and other technical contents, features and effects of the present invention are described below with reference to the attached Figures 1 to 10 The details of the embodiments will be clearly presented. The contents mentioned in the following embodiments are all based on the accompanying drawings.

[0040] Various exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0041] As an embodiment, the present invention is a welding device for LNG air-cooled heat exchange circulation pipes, including an air-cooled structure main body 1, a main pipe 4 and a welding machine main body 5 for welding, the welding machine main body 5 provides welding power, the welding machine main body 5 is an arc welding machine, a plurality of fixed branch pipes 2 are welded on the air-cooled structure main body 1, a plurality of mounting holes are opened on the main pipe 4, and movable branch pipes 3 are inserted into the mounting holes. The number of fixed branch pipes 2 and movable branch pipes 3 are both several and the diameter size of the several fixed branch pipes 2 and movable branch pipes 3 is the same. The present invention is mainly used for welding fixed branch pipes 2 and movable branch pipes 3.

[0042] The surface of the movable branch 3 is provided with a main sliding frame 50. The size of the main sliding frame 50 satisfies the requirement to be placed between two adjacent movable branch 3. The main sliding frame 50 is connected to the welding machine body 5 and is a part of the welding machine body 5. One side of the main sliding frame 50 is rotatably connected to the drive shaft 36. The surface of the drive shaft 36 is welded with a drive frame 37. The inside of the drive frame 37 is hinged with an adjustment arm 38 on both sides. The adjustment arm 38 is hinged with an adjustment shaft 39 on one side. The adjustment shaft 39 is welded with a sliding rod 41 at one end. The main sliding frame 50 There are two symmetrical limiting slides 40 inside, the limiting slide 40 is long, the limiting slide 40 cooperates with the sliding rod 41, the sliding rod 41 is slidably connected to the inside of the limiting slide 40, and a clamping frame 42 is welded at one end of the sliding rod 41. The clamping frame 42 is arc-shaped. The two clamping frames 42 are used to clamp and fix the movable branch 3. The clamping frames 42 and the movable branch 3 are adapted to each other. The inner side of the clamping frame 42 is processed with an anti-slip groove. The clamping frame 42 is clamped on the surface of the movable branch 3, and the main sliding frame 50 is fixed close to the fixed One end of the branch pipe 2 is also integrally extended with a sliding frame plate, and a through hole is opened on the inside of the sliding frame plate, and a bending rack 30 is slidably connected in the through hole. A bending gear 29 is hinged on the inside of the main sliding frame 50 and meshed with the bending rack 30. The bending gear 29 is a structure composed of a support shaft and a gear. A handle 28 is welded on the top of the bending gear 29. The handle 28 can provide driving force for the bending gear 29. An annular fixing frame 31 is welded on one end of the bending rack 30, and an annular groove 32 is opened inside the annular fixing frame 31. An annular sliding frame 33 is slidably connected to the inside of the annular groove 32. The annular fixing frame 31 is a semi-annular frame of one hundred and eighty degrees and the annular sliding frame 33 is a semi-annular frame of more than one hundred and eighty degrees, which can provide a reasonable use of space and prevent the annular sliding frame 33 from escaping from the annular groove 32 inside the annular fixing frame 31. A knob 35 with multiple slots is fixedly installed at one end of the driving shaft 36. The surface of the knob 35 and the inside of the main sliding frame 50 are both clamped with the limit frame 34. The limit frame 34 is disassembled and plugged into the main sliding frame 50.

[0043] In this embodiment, when it is necessary to perform corresponding welding on the fixed branch pipe 2 and the movable branch pipe 3, the main sliding frame 50 is adjusted to be placed between the two adjacent movable branch pipes 3, the two clamping frames 42 are adjusted to be placed at the upper and lower ends of the movable branch pipe 3, and the limiting frame 34 is pulled out from the inside of the knob 35 and the main sliding frame 50. At this time, the two clamping frames 42 are initially in the state of the farthest relative distance. Then, the knob 35 is rotated to drive the driving frame 37 to rotate. The two sides of the driving frame 37 respectively drive the two adjustment arms 38 to rotate in different directions, and at the same time, the two adjustment shafts 39, the sliding rod 41 and the clamping frame 42 are pulled inward, and the clamping frame 42 clamps the movable branch pipe 3. Then the limiting frame 34 is inserted back into the main sliding frame 50 to limit the knob 35, thereby fixing the main sliding frame 50.

[0044] After the main sliding frame 50 is fixed as a whole, the annular sliding frame 33 can be pulled to slide inside the annular groove 32, and the annular sliding frame 33 can close the annular fixing frame 31. At this time, the movable branch pipe 3 is wrapped in the ring formed by the annular sliding frame 33 and the annular groove 32, and after closing, the handle 28 is rotated to drive the bending gear 29 to rotate, thereby driving the bending rack 30, the annular fixing frame 31 and the annular sliding frame 33 to move. According to the direction in which the movable branch pipe 3 needs to be adjusted, the annular fixing frame 31 or the annular sliding frame 33 contacts and pushes or pulls the movable branch pipe 3, and performs auxiliary bending processing on one end of the movable branch pipe 3 so that the movable branch pipe 3 corresponds to the port of the fixed branch pipe 2, and then the next step of welding is carried out.

[0045] As an embodiment, a mounting bracket 6 is fixedly installed on the welding machine body 5, and a first threaded sleeve 8 is fixedly installed inside the mounting bracket 6, and a first screw rod 7 is connected to the first screw rod 7 through a threaded connection inside the first threaded sleeve 8, and the top of the first screw rod 7 is rotatably connected to the first support seat 14 through a bearing, and the top of the first support seat 14 is arc-shaped, and a second threaded sleeve 12 is fixedly installed inside the first support seat 14, and a second screw rod 11 is connected to the second screw rod 11 through a bearing. The top of the second screw rod 11 is rotatably connected to the second support seat 15 through a bearing, and the top of the second support seat 15 is arc-shaped. The second support seat 15 and the top of the first support seat 14 are overlapped at the bottom of the main pipe 4, and the second support seat 15 and the first support seat 14 can support the main pipe 4. A support arm 57 is fixedly installed on one side of the second support seat 15, and a first swing arm 52 is hinged on the inside of the support arm 57, a second swing arm 53 is hinged on the inside of the first swing arm 52, and a third swing arm 5 is hinged on the inside of the second swing arm 53. 4. A rotating telescopic cylinder 55 is welded to one side of the third swing arm 54. The rotating telescopic cylinder 55 is a structure composed of an outer cylinder and an inner cylinder. The inner cylinder is slidably connected to the inside of the outer cylinder. The outer cylinder is fixedly installed on one side of the third swing arm 54. One end of the inner cylinder is rotatably connected to the connecting frame 49. One end of the rotating telescopic cylinder 55 is rotatably connected to the connecting frame 49. A first limiting sleeve 9 is fixedly installed inside the mounting frame 6. The first limiting sleeve 9 is internally slidably connected to a first limiting rod 10 fixedly installed at the bottom of the first support seat 14. A second limiting sleeve 13 is fixedly installed inside the first support seat 14. The second limiting sleeve 13 is internally slidably connected to a second limiting rod 56 fixedly installed at the bottom of the second support seat 15. A main fixed frame 51 is fixedly installed on the inside of the connecting frame 49. The main sliding frame 50 is rotatably connected to the inside of the main fixed frame 51. The main fixed frame 51 is semicircular. An arc-shaped through hole is opened in the middle of the main fixed frame 51. A plurality of evenly distributed card slots 43 are opened on the surface of the main fixed frame 51.

[0046] An extension block is fixed to one side of the main sliding frame 50, and an inner groove 46 is provided on the extension block. A return spring 47 is installed in the inner groove 46, and the return spring 47 is connected to a connecting block 48. The inner groove 46 can provide an installation space for the return spring 47. The inner groove 46 and the connecting block 48 are adapted to each other. The connecting block 48 is slidably connected inside the inner groove 46, and the return spring 47 can limit the connecting block 48 and the limit block 45. A limit block 45 is fixedly installed on one side of the connecting block 48, and the limit block 45 is placed on the other side of the main fixed frame through an arc-shaped through hole. A card block 44 that is clamped in the card slot 43 is fixedly installed on one side of the limit block 45.

[0047] In this embodiment, when choosing to support the main pipe 4 at different heights, the first screw rod 7 can be rotated to cooperate with the first threaded sleeve 8 in a fixed position, driving the first screw rod 7 and the first support seat 14 to rotate. At the same time, the second screw rod 11 can also be rotated as needed to cooperate with the second threaded sleeve 12 in a relatively fixed position, driving the second screw rod 11 and the second support seat 15 to adjust and rise to a suitable height to provide limited support for the main pipe 4.

[0048] When it is necessary to adjust the position of the main sliding frame 50, the height of the rotating telescopic cylinder 55 connected to the third swing arm 54 can be flexibly adjusted in conjunction with the articulation between the first swing arm 52 and the support arm 57, the first swing arm 52 and the second swing arm 53, and the second swing arm 53 and the third swing arm 54. At the same time, the height of the connecting frame 49 and the main sliding frame 50 can be adjusted. At this time, the position of the connecting frame 49 and the main sliding frame 50 is adjusted in conjunction with the rotating telescopic cylinder 55, and the main sliding frame 50 is adjusted accordingly according to the position of the movable branch pipe 3 that needs to be welded.

[0049] Since the fixed branch pipe 2 and the movable branch pipe 3 not only have position deviations in the left and right directions, but may also have position deviations in the up and down directions or circumferential directions, when the movable branch pipe 3 needs to be bent, the limit block 45 can be pulled outward to disengage the clamping block 44 from the clamping slot 43. At this time, the limit block 45 is rotated, and the limit block 45 and the main sliding frame 50 rotate together, driving the main sliding frame 50 to rotate and slide inside the main fixed frame 51. According to the need to bend the movable branch pipe 3, the angle of the main fixed frame 51 is adjusted. After the angle is adjusted, the limit block 45 is released, and the connecting block 48 and the limit block 45 are reset with the help of the reset spring 47, and the reset limit block 45 is locked with the help of the clamping block 44 and the clamping slot 43.

[0050] It should be noted that, in order to facilitate pulling the limit block 45 , an outwardly extending pull rod may be fixed on the limit block 45 .

[0051] As an embodiment, the main sliding frame 50 is fixedly installed with a cleaning frame 16 on one side close to the movable branch pipe 3, and the cleaning frame 16 is internally slidably connected with a traction rack 22. The cleaning frame 16 is a 180-degree arc frame, and the traction rack 22 is an arc frame greater than 180 degrees. An extension block 23 is fixedly connected to one side of the traction rack 22, and a connecting rod 26 is internally slidably connected to the extension block 23. A scraper head 24 is fixedly installed at one end of the connecting rod 26. The scraper head 24 is an arc-shaped blade, and the other end of the connecting rod 26 is fixedly connected to a limit plate 27. A limit spring 25 is fixedly installed between the limit plate 27 and the extension block 23. The limit spring 25 can limit the elastic force of the scraper head 24, so that the scraper head 24 can fit the processed The surfaces of the fixed branch pipe 2 and the movable branch pipe 3 have a better cleaning effect. The two positions near the opening on the inner side of the cleaning frame 16 are rotatably connected to the drive gear 19 that meshes with the traction rack 22. The two drive gears 19 can drive the traction rack 22. A drive motor 21 is provided at one end of one of the drive gears 19. The drive motor 21 is externally connected to the power supply and the controller. The drive motor 21 can provide driving force for the drive gear 19. The drive motor 21 is fixedly mounted on the cleaning frame 16. The inner side of the cleaning frame 16 is rotatably connected to the limit shaft 18. There are three groups of limit shafts 18, and the number of each group of limit shafts 18 is two. The surfaces of the drive gear 19 and the three groups of limit shafts 18 are all transmission-connected with the transmission belt 17.

[0052] In this embodiment, when the welding position needs to be cleaned, the cleaning frame 16 is adjusted to the welding surface position. The driving motor 21 can be controlled by the controller to drive the driving gear 19 corresponding to the driving motor 21 to rotate. The corresponding driving gear 19 rotates in one direction, and with the help of the transmission belt 17 and three sets of limiting shafts 18, the other driving gear 19 is driven to rotate in the same direction. In the initial state, the traction rack 22 is inside the cleaning frame 16. At this time, the two driving gears 19 simultaneously drive the traction rack 22 to rotate in the corresponding direction, so that when one of the driving gears 19 disengages from the traction rack 22, the other can continue to drive, so that the connecting rod 26 and the scraper head 24 connected to the traction rack 22 continue to clean and polish around the welding position, and the welding surface in a cramped environment is processed.

[0053] Working principle:

[0054] S1. When welding is required for the fixed branch pipe 2 and the movable branch pipe 3 of the circulation pipe, first push the welding machine body 5 to a suitable welding position, then overlap and place the main pipe 4 on top of the first support seat 14 and the second support seat 15, and at this time insert the movable branch pipe 3 into the main pipe 4.

[0055] Rotate the first screw rod 7 as needed, and with the help of the first threaded sleeve 8 in a relatively fixed position, drive the first support seat 14 and the second support seat 15 to rise. When it rises to the highest point driven by the first screw rod 7, rotate the second screw rod 11 again, and with the help of the second threaded sleeve 12 in a relatively fixed position, drive the second screw rod 11, the second support seat 15 and the main pipe 4 to continue to rise until the main pipe 4 is pushed up to a suitable corresponding height.

[0056] After the main pipe 4 is adjusted in height, the movable branch pipe 3 to be welded can be adjusted in height accordingly by means of the support arm 57 on one side of the second support seat 15, the cooperation between the support arm 57 and the first swing arm 52, the first swing arm 52 and the second swing arm 53, and the second swing arm 53 and the third swing arm 54. At the same time, the connecting frame 49 and the main sliding frame 50 are driven to move by rotating the telescopic cylinder 55 to adjust the spatial position of the main sliding frame 50 until the main sliding frame 50 is adjusted to the side of the movable branch pipe 3 to be welded. After the position of the main sliding frame 50 is adjusted, the limit block 45 can be pulled out according to the deviation angle between the corresponding fixed branch pipe 2 and the movable branch pipe 3 to disengage the clamping block 44 from the clamping groove 43. At this time, the limit block 45 is rotated to drive the main sliding frame 50 to rotate inside the main fixed frame 51 to adjust the angle of the main sliding frame 50.

[0057] After the angle of the main sliding frame 50 is adjusted, the limiting frame 34 can be removed first, and the knob 35 is turned to drive the driving frame 37 to rotate, and the driving frame 37 drives the adjusting arms 38 on both sides to rotate accordingly. The two adjusting arms 38 simultaneously drive the two adjusting shafts 39, the two sliding rods 41 and the two clamping frames 42 to approach inward, and the two clamping frames 42 approaching inward clamp the movable branch pipe 3 to fix it. After the movable branch pipe 3 is clamped and fixed, the annular sliding frame 33 is pulled out from the annular groove 32, so that the annular sliding frame 33 closes the annular fixing frame 31, and after closing, the handle 28 is turned to drive the bending gear 29 to rotate, thereby driving the bending rack 30, the annular fixing frame 31 and the annular sliding frame 33 to move, and the moving annular fixing frame 31 and the annular sliding frame 33 bend the movable branch pipe 3 until the movable branch pipe 3 is bent to correspond to the fixed branch pipe 2. At this time, the welding machine body 5 is cooperated to weld the connection part between the fixed branch pipe 2 and the movable branch pipe 3.

[0058] S4. After welding is completed, the scraper head 24 can be adjusted and moved to the welding position through step S2, and the drive motor 21 can be controlled by the controller to work, driving the drive gear 19 corresponding to the drive motor 21 to rotate, and the corresponding drive gear 19 rotates in one direction, with the help of the transmission belt 17 and the three sets of limit shafts 18, driving the other drive gear 19 to rotate in the same direction. In the initial state, the traction rack 22 is inside the cleaning frame 16. At this time, the two drive gears 19 simultaneously drive the traction rack 22 to rotate in the corresponding opposite direction, so that when one of the drive gears 19 disengages from the traction rack 22, the other can continue to keep driving, so that the connecting rod 26 connected to the traction rack 22 and the scraper head 24 can continue to clean and polish around the welding position.

[0059] The present invention has the following technical effects.

[0060] 1. The present invention drives the driving frame to rotate by turning the knob, and the two sides of the driving frame respectively drive the two adjustment arms to rotate in different directions, and at the same time pull the two adjustment shafts, the sliding rod and the clamping frame inward, so that the clamping frame clamps the movable branch pipe, and can stably clamp and fix the movable branch pipe. The rotating handle drives the bending gear to rotate, thereby driving the bending rack, the annular fixing frame and the annular sliding frame to move. The annular fixing frame or the annular sliding frame contacts and pushes the movable branch pipe to perform auxiliary bending processing on one end of the movable branch pipe, which can effectively compensate for processing errors. Compared with bending and docking before welding, the accuracy of the bending and docking is higher, and compared with bending and docking after welding, it is more labor-saving and more suitable for use in cramped spaces.

[0061] 2. The present invention rotates the first screw rod to cooperate with the first threaded sleeve in a fixed position, thereby driving the first screw rod, the first support seat, and the second support seat to rotate. At the same time, the second screw rod can be rotated to cooperate with the second threaded sleeve in a relatively fixed position as needed, thereby driving the second screw rod and the second support seat to be adjusted and raised to a suitable height, thereby providing positional support for the main pipe. This is capable of supporting and positioning welded main pipes of large mass.

[0062] 3. The present invention works by driving a motor to drive a driving gear corresponding to the driving motor to rotate. The corresponding driving gear rotates in one direction, and with the help of a transmission belt and three sets of limit shafts, drives the other driving gear to rotate in the same direction. At this time, the two driving gears simultaneously drive the traction rack to rotate in the opposite direction, so that when one of the driving gears disengages from the traction rack, the other can continue to drive, driving the scraper head to continuously clean and polish around the welding position, reducing the operation of manual polishing of the welding surface in a cramped environment. The non-closed structure realizes annular polishing, which can achieve polishing without affecting the separation between the structure and the movable branch.

[0063] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. Various modifications and substitutions of the present invention will be readily apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A welding device for LNG air-cooled heat exchange circulation pipes, comprising an air-cooled structure main body (1), a main pipe (4) and a welding machine main body (5) for welding, wherein a plurality of fixed branch pipes (2) are welded on the air-cooled structure main body (1), a plurality of mounting holes are opened on the main pipe (4), and movable branch pipes (3) are inserted into the mounting holes, the number of fixed branch pipes (2) and movable branch pipes (3) are both several, and the diameters of the several fixed branch pipes (2) and the movable branch pipes (3) are the same, and the device is characterized in that: The welding machine body (5) is provided with a main sliding frame (50), one side of the main sliding frame (50) is rotatably connected to a driving shaft (36), the surface of the driving shaft (36) is welded with a driving frame (37), both sides of the driving frame (37) are hinged with an adjusting arm (38), one side of the adjusting arm (38) is hinged with an adjusting shaft (39), one end of the adjusting shaft (39) is welded with a sliding rod (41), two symmetrical limiting grooves (40) are opened inside the main sliding frame (50), the sliding rod (41) is slidably connected to the limiting groove (40), one end of the sliding rod (41) is welded with a clamping frame (42), the clamping frame (42) is clamped on the surface of the movable branch (3), and the main sliding frame (50) is provided with a main sliding frame (50). ) is also integrally connected with a sliding frame plate (58), the inner side of the sliding frame plate (58) is slidably connected with a bending rack (30), the inner side of the main sliding frame (50) is rotatably mounted with a bending gear (29) meshing with the bending rack (30), the bending gear (29) is coaxially welded with a handle (28), one end of the bending rack (30) is welded with an annular fixed frame (31), an annular groove (32) is provided inside the annular fixed frame (31), the annular groove (32) is slidably connected with an annular sliding frame (33), the movable branch pipe (3) is wrapped in the ring formed by the annular sliding frame (33) and the annular groove (32), and the welding machine body (5) performs welding processing on the connection part between the fixed branch pipe (2) and the movable branch pipe (3).

2. A welding device for LNG air-cooled heat exchange circulation pipe according to claim 1, characterized in that: A knob (35) is fixedly mounted on one end of the driving shaft (36), and a limit frame (34) is clamped on the surface of the knob (35) and inside the main sliding frame (50).

3. The welding device for LNG air-cooled heat exchange circulation pipe according to claim 1, characterized in that: A mounting frame (6) is fixedly mounted on the bottom of the welding machine body (5), a first threaded sleeve (8) is fixedly mounted inside the mounting frame (6), a first screw rod (7) is threadedly connected to the inside of the first threaded sleeve (8), a top end of the first screw rod (7) is rotatably connected to a first support seat (14) via a bearing, a second threaded sleeve (12) is fixedly mounted inside the first support seat (14), a second screw rod (11) is threadedly connected to the inside of the second threaded sleeve (12), a top end of the second screw rod (11) is rotatably connected to a second support seat (15) via a bearing, a support arm (57) is fixedly mounted on one side of the second support seat (15), a first swing arm (52) is hingedly connected to the inside of the support arm (57), a second swing arm (53) is hingedly connected to the inside of the first swing arm (52), a third swing arm (54) is hingedly connected to the inside of the second swing arm (53), a rotating telescopic cylinder (55) is welded to one side of the third swing arm (54), and one end of the rotating telescopic cylinder (55) is rotatably connected to a connecting frame (49).

4. A welding device for LNG air-cooled heat exchange circulation pipe according to claim 3, characterized in that: A first limiting sleeve (9) is fixedly installed inside the mounting frame (6), and a first limiting rod (10) fixedly installed at the bottom of the first support seat (14) is slidably connected inside the first limiting sleeve (9).

5. The welding device for LNG air-cooled heat exchange circulation pipe according to claim 3, characterized in that: A second limiting sleeve (13) is fixedly installed inside the first support seat (14), and a second limiting rod (56) fixedly installed at the bottom of the second support seat (15) is slidably connected inside the second limiting sleeve (13).

6. The welding device for LNG air-cooled heat exchange circulation pipe according to claim 3, characterized in that: A main fixed frame (51) is fixedly mounted on the inner side of the connecting frame (49), and the main sliding frame (50) is slidably connected inside the main fixed frame (51).

7. A welding device for LNG air-cooled heat exchange circulation pipe according to claim 6, characterized in that: A plurality of slots (43) are provided on the surface of the main fixed frame (51), an inner slot (46) is provided inside the main sliding frame (50), a connecting block (48) is slidably connected inside the inner slot (46), a return spring (47) is fixedly installed between the connecting block (48) and the inner slot (46), a limiting block (45) is fixedly installed on one side of the connecting block (48), and a clamping block (44) clamped in the inner slot (43) is fixedly installed on one side of the limiting block (45).

8. The welding device for LNG air-cooled heat exchange circulation pipe according to claim 1, characterized in that: A cleaning frame (16) is fixedly mounted on one side of the main sliding frame (50), a traction rack (22) is slidably connected to the inside of the cleaning frame (16), an extension block (23) is fixedly connected to one side of the traction rack (22), a connecting rod (26) is slidably connected to the inside of the extension block (23), a scraper head (24) is fixedly mounted on one end of the connecting rod (26), and a limiting plate (27) is fixedly connected to the other end of the connecting rod (26), a limiting spring (25) is fixedly mounted between the limiting plate (27) and the extension block (23), and two positions near the opening on the inside of the cleaning frame (16) are rotatably connected to a driving gear (19) that meshes with the traction rack (22).

9. A welding device for LNG air-cooled heat exchange circulation pipe according to claim 8, characterized in that: A driving motor (21) is provided at one end of one of the driving gears (19), and the driving motor (21) is fixedly mounted on the cleaning frame (16).

10. The welding device for LNG air-cooled heat exchange circulation pipe according to claim 8, characterized in that: The inner side of the cleaning frame (16) is rotatably connected to a limiting shaft (18), and the limiting shaft (18) has three groups, and each group of the limiting shafts (18) has two. The driving gear (19) and the surfaces of the three groups of limiting shafts (18) are all connected to a transmission belt (17).

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