Welding device for pipeline compensation joint

Abstract

The invention relates to the technical field of pipeline compensation joint welding, and discloses a pipeline compensation joint welding device which comprises a base, an electric chuck is rotationally connected to the base, a plurality of L-shaped finger clamps are arranged on the electric chuck, a movable cleaning seat is arranged on one side of the base, an adsorption cover is installed on the cleaning seat, and a plurality of L-shaped finger clamps are arranged on the adsorption cover. A movable mounting plate is arranged in the cleaning seat, a plurality of cleaning brush blocks are fixed on the mounting plate, and rotatable cover plates are arranged on the two sides of the cleaning seat; an electric push rod is fixed to the lower portion of the base, a movable L-shaped hollow column is arranged on one side of the base, a limiting support is connected to the L-shaped hollow column in a sliding mode, two welding guns are arranged on one side of the base, a first flange ring and a second flange ring can be welded to a main pipe at the same time after being positioned, time and labor are saved in the whole welding process, and the welding efficiency is improved. And the welding efficiency of the pipeline compensation joint is improved.

Description

Technical Field

[0001] This invention relates to the field of pipeline expansion joint welding technology, specifically to a welding device for pipeline expansion joints. Background Technology

[0002] Pipeline compensators, also known as expansion joints or expansion couplings, are primarily used to compensate for the thermal expansion and contraction of pipelines caused by temperature changes. If a pipeline cannot expand or contract freely during temperature changes, thermal stress will be generated within it. This stress must be considered in pipeline design; otherwise, it may lead to pipeline rupture and disrupt normal production. As an important component of pipeline engineering, compensators play a crucial role in ensuring the long-term normal operation of pipelines. Expansion joints mainly consist of a main body, an expansion pipe, a sealing device, bolts, and nuts. The main body includes the main pipe and two flange rings welded to the main pipe.

[0003] During the main welding process of the pipeline expansion joint, one of the first flange rings needs to be fitted onto the main pipe and welded flush with the lower end face of the main pipe. After welding, the second flange ring is fitted onto the main pipe again and positioned according to the welding position. Welding is then carried out after positioning. During the positioning process, the height position of the second flange ring on the main pipe needs to be continuously measured and adjusted, which is time-consuming and labor-intensive. The entire welding process takes a long time and affects the welding efficiency of the pipeline expansion joint. Summary of the Invention

[0004] This invention provides a welding device for pipe expansion joints, which features adjustable height for the second flange ring to ensure accurate positioning during welding. Two welding guns on one side of the base allow for simultaneous welding of the first and second flange rings to the main pipe after positioning. This process is time-saving, labor-saving, convenient, and efficient, improving the welding efficiency of pipe expansion joints. It solves the problem mentioned in the background art where continuous measurement and adjustment of the second flange ring's height on the main pipe during positioning is time-consuming and labor-intensive, resulting in a long welding time and impacting the welding efficiency of pipe expansion joints.

[0005] The present invention provides the following technical solution: a welding device for pipe expansion joints, including a base, an electric chuck rotatably connected to the base, a plurality of L-shaped finger clamps on the electric chuck, a movable cleaning seat on one side of the base, an adsorption cover installed on the cleaning seat, a movable mounting plate inside the cleaning seat, a plurality of cleaning brush blocks fixed on the mounting plate, and rotatable cover plates on both sides of the cleaning seat. An electric push rod is fixed below the base, and a movable L-shaped hollow column is provided on one side of the base. A limit bracket is slidably connected on the L-shaped hollow column, and a C-shaped frame is fixed at one end of the L-shaped hollow column. Two movable welding guns are provided on the base.

[0006] As an optional embodiment of the welding device for pipe compensation joints described in this invention, a servo motor is fixed on the base, the motor shaft of the servo motor is fixedly connected to the electric chuck, a guide rod is fixed on the base, the L-shaped hollow column is elastically connected to the guide rod through a fifth spring, and a locking screw is threaded onto the L-shaped hollow column.

[0007] As an optional embodiment of the welding device for pipe compensation joints described in this invention, a first abutting wedge is fixed on the piston rod of the electric push rod, and a second abutting wedge is slidably connected to one side of the shaped frame. The second abutting wedge is elastically connected to the shaped frame through a sixth spring.

[0008] As an optional embodiment of the welding device for pipe compensation joints described in this invention, a strip plate is fixed below the cleaning seat, the strip plate is slidably connected to the base, and the strip plate is elastically connected to the piston rod of the electric push rod through a first spring. A first abutting rod is slidably connected to the strip plate, a limit block is fixed at one end of the first abutting rod, and a rocker plate is abutted at one end of the first abutting rod.

[0009] As an optional embodiment of the welding device for pipe expansion joints described in this invention, a rotating block is installed on the strip plate, a rocker plate is rotatably connected to the rotating block, and a second abutting rod is abutted on the rocker plate. The second abutting rod is elastically connected to the cleaning seat through a second spring. A sliding bracket is fixed on the second abutting rod, and the sliding bracket is elastically connected to the mounting plate through a third spring.

[0010] As an optional embodiment of the welding device for pipe expansion joints described in this invention, wherein: a connecting shaft is fixed on the cover plate, the connecting shaft is rotatably connected to the cleaning seat, and a gear is fixed on the connecting shaft, a U-shaped rack is meshed on the gear, an abutment frame is fixed on the U-shaped rack, the abutment frame is elastically connected to the cleaning seat through a fourth spring, a third abutment rod is abutted on the abutment frame, the third abutment rod is slidably connected to the cleaning seat, and the lower end of the third abutment rod abuts against the second abutment rod.

[0011] As an optional embodiment of the welding device for pipe compensation joints described in this invention, a conical abutment head is slidably connected to the cleaning seat, a ninth spring is connected between the conical abutment head and the cleaning seat, and a third abutment wedge is fixed to the back of the mounting plate.

[0012] As an optional embodiment of the welding device for pipe compensation joints described in this invention, the cleaning seat is provided with a comb-tooth rack, a fourth abutment rod is fixed on one side of the comb-tooth rack, the fourth abutment rod is elastically connected to the cleaning seat through a seventh spring, and a scraper is fixed at the lower end of the comb-tooth rack, and a filter plate is fixed on the adsorption cover.

[0013] As an optional embodiment of the welding device for pipe compensation joints described in this invention, the cleaning seat is provided with slag discharge ports on both sides, and an L-shaped baffle is provided on one side of the slag discharge port. The L-shaped baffle is elastically connected to the cleaning seat through an eighth spring. Two collection boxes are fixed on the base, and the two collection boxes are located on both sides of the cleaning seat.

[0014] As an optional embodiment of the welding device for pipe expansion joints described in this invention, a strip rod is slidably connected to the base, the lower end of the strip rod is fixed to the U-shaped frame, and a wave-shaped contact plate is fixed to the strip rod.

[0015] The present invention has the following beneficial effects:

[0016] 1. In this welding device for pipe expansion joints, the inner wall of the main pipe of the pipe expansion joint can be pressed and positioned by the cooperation of the electric chuck on the base and several L-shaped finger clamps. The height of the second flange ring can be adjusted according to the welding height of the L-shaped hollow column through the sliding connection of the limiting bracket, ensuring the positioning accuracy of the second flange ring during welding. The C-shaped frame connected to one end of the L-shaped hollow column can be elastically connected to the second abutting wedge. During positioning, the limiting bracket on the L-shaped hollow column can be driven to stick to the main pipe, thereby positioning the second flange ring and improving the convenience of positioning operation. Through the two welding guns set on one side of the base, after the first flange ring and the second flange ring are positioned, they can be welded to the main pipe at the same time. The whole welding process is time-saving, labor-saving, convenient and fast, improving the welding efficiency of the pipe expansion joint. When the first contact wedge on the piston rod of the electric push rod moves, it contacts the second contact wedge, causing the second contact wedge to retract on the C-shaped frame so that the first contact wedge can move to the other side of the second contact wedge. When the first flange ring is fitted on the main pipe and moves down to the correct position, the retraction of the piston rod of the electric push rod can drive the C-shaped frame, the L-shaped hollow column and the limiting bracket to move synchronously, causing the limiting bracket to abut against the main pipe so that the second flange ring can be accurately positioned after being fitted on the main pipe. During welding, two welding guns can simultaneously abut against the weld seam between the second flange ring and the first flange ring for welding.

[0017] 2. In this welding device for pipe expansion joints, the piston rod of the electric push rod can drive the cleaning seat on the strip plate to move synchronously when extended, making it convenient for the cleaning seat to automatically approach the main pipe. Through the mounting plate inside the cleaning seat, it is convenient to install several cleaning brush blocks. When the mounting plate extends from the cleaning seat, it can drive the cleaning brush blocks to extend and press against the main pipe. During the rotation of the main pipe, it can achieve the purpose of cleaning the welding surface of the main pipe in all aspects, which is conducive to cleaning the impurities on the welding surface of the main pipe, thereby improving the welding quality. Through the adsorption cover on the cleaning seat, it can be connected to a dust collection device to facilitate the removal of the cleaned impurities and residual impurities attached to the welding surface of the main pipe during cleaning, which can further improve the welding quality. The cover plate on the cleaning seat can seal the cleaning seat when the cleaning brush is not in use, preventing impurities from adhering to the cleaning brush and affecting the cleaning effect of the main pipe. The first abutment rod on the strip plate can contact the electric chuck during movement, causing the first abutment rod to slide on the strip plate and automatically push the rocker to deflect, so that the rocker to push the second abutment rod to move horizontally. On the one hand, during the movement of the second abutment rod, with the cooperation of the third abutment rod, the abutment frame, the zigzag rack and gear, the cover plate is automatically opened from the cleaning seat. On the other hand, the movement of the second abutment rod can drive the strip plate and the cleaning brush to automatically move out of the cleaning seat, making it convenient to clean impurities on the main pipe.

[0018] 3. In this pipe expansion joint welding device, the comb teeth inside the cleaning seat can comb out the residual impurities on several cleaning brush blocks, making it easier for the cleaning brush blocks to be used next time. The filter plate on the adsorption cover can prevent large impurities from entering the dust collection equipment to prevent damage. The scraper at the lower end of the comb teeth can push the impurities at the bottom of the cleaning seat to one side of the cleaning seat and discharge them into the collection box through the slag discharge port. On the other hand, it is also beneficial to scrape off the impurities attached to the filter plate, thereby improving the dust collection effect. When the C-shaped frame moves the L-shaped hollow column and the strip rod synchronously, the wave-shaped contact plate on the strip rod can make intermittent contact with the fourth contact rod, so that the fourth contact rod can drive the comb bar to reciprocate in the cleaning seat, which can improve the self-cleaning effect of the cleaning brush block. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the welding of the pipe expansion joint of the present invention.

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 3 This is a schematic diagram of the strip plate structure of the present invention.

[0022] Figure 4 This is a schematic diagram of the cleaning seat structure of the present invention.

[0023] Figure 5 This is a cross-sectional view of the cleaning seat structure of the present invention.

[0024] Figure 6 This is a schematic diagram of the cleaning brush block structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the internal structure of the cleaning seat of the present invention.

[0026] Figure 8 for Figure 3 Enlarged view of point A in the middle.

[0027] Figure 9 for Figure 4 Enlarged view of section B in the middle.

[0028] In the diagram: 1. Base; 2. Electric chuck; 3. L-shaped finger clip; 4. Cleaning seat; 5. Adsorption cover; 6. Mounting plate; 7. Cleaning brush block; 8. Cover plate; 9. Electric push rod; 10. First contact wedge; 11. L-shaped hollow column; 12. Limiting bracket; 13. C-shaped frame; 14. Strip plate; 15. First spring; 16. First contact rod; 17. Limiting block; 18. Rocker; 19. Second contact rod; 20. Second spring; 21. Sliding bracket; 22. Third spring; 23. Connecting shaft; 24. Gear; 25. C-shaped rack; 26. Contact frame; 261. Fourth Spring; 27. Third Abutment Rod; 28. Servo Motor; 29. ​​Guide Rod; 30. Fifth Spring; 31. Second Abutment Wedge; 32. Sixth Spring; 33. Comb Rack; 34. Fourth Abutment Rod; 35. Seventh Spring; 36. Scraper; 37. Filter Plate; 38. Slag Discharge Port; 39. L-shaped Baffle; 40. Eighth Spring; 41. Collection Box; 42. Strip Rod; 43. Wave Abutment Plate; 44. Conical Abutment Head; 45. Ninth Spring; 46. Third Abutment Wedge; 47. Welding Gun; 48. Rotating Block; 49. Locking Screw. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1, please refer to Figures 1 to 9A welding device for pipe expansion joints includes a base 1, an electric chuck 2 rotatably connected to the base 1, a plurality of L-shaped finger clamps 3 on the electric chuck 2, a movable cleaning seat 4 on one side of the base 1, an adsorption cover 5 installed on the cleaning seat 4, and a movable mounting plate 6 inside the cleaning seat 4, a plurality of cleaning brush blocks 7 fixed on the mounting plate 6, and rotatable cover plates 8 on both sides of the cleaning seat 4. An electric push rod 9 is fixed below the base 1. A movable L-shaped hollow column 11 is provided on one side of the base 1. A limit bracket 12 is slidably connected on the L-shaped hollow column 11. A U-shaped frame 13 is fixed at one end of the L-shaped hollow column 11. Two movable welding guns 47 are provided on the base 1.

[0031] A servo motor 28 is fixed on the base 1. The motor shaft of the servo motor 28 is fixedly connected to the electric chuck 2. A guide rod 29 is fixed on the base 1. The L-shaped hollow column 11 is elastically connected to the guide rod 29 through the fifth spring 30. A locking screw 49 is threaded on the L-shaped hollow column 11.

[0032] A first abutting wedge 10 is fixed on the piston rod of the electric push rod 9, and a second abutting wedge 31 is slidably connected to one side of the shaped frame 13. The second abutting wedge 31 is elastically connected to the shaped frame 13 through a sixth spring 32.

[0033] A strip plate 14 is fixed below the cleaning seat 4. The strip plate 14 is slidably connected to the base 1, and the strip plate 14 is elastically connected to the piston rod of the electric push rod 9 through the first spring 15. A first abutting rod 16 is slidably connected on the strip plate 14. A limit block 17 is fixed at one end of the first abutting rod 16, and a rocker plate 18 is abutted at one end of the first abutting rod 16.

[0034] A rotating block 48 is installed on the strip plate 14. A rocker arm 18 is rotatably connected to the rotating block 48, and a second abutting rod 19 is abutted on the rocker arm 18. The second abutting rod 19 is elastically connected to the cleaning seat 4 through a second spring 20. A sliding bracket 21 is fixed on the second abutting rod 19. The sliding bracket 21 is elastically connected to the mounting plate 6 through a third spring 22.

[0035] A connecting shaft 23 is fixed on the cover plate 8. The connecting shaft 23 is rotatably connected to the cleaning seat 4. A gear 24 is fixed on the connecting shaft 23. A rack 25 is meshed on the gear 24. An abutment frame 26 is fixed on the rack 25. The abutment frame 26 is elastically connected to the cleaning seat 4 through a fourth spring 261. A third abutment rod 27 is abutted on the abutment frame 26. The third abutment rod 27 is slidably connected to the cleaning seat 4. The lower end of the third abutment rod 27 abuts against the second abutment rod 19.

[0036] refer to Figures 1 to 9During the welding of the main body of the pipe expansion joint, the main pipe is first placed on the electric chuck 2 and fitted onto several L-shaped finger clamps 3. The electric chuck 2 adjusts the positions of the L-shaped finger clamps 3 so that they abut against the inner wall of the main pipe for positioning. Then, the piston rod of the electric push rod 9 extends, causing the strip plate 14 to move horizontally, causing the cleaning seat 4 fixed above the strip plate 14 to gradually approach the welding surface of the main pipe. At this time, the first spring 15 remains unchanged, while the first abutting rod 16 abuts against the electric chuck 2, causing the first abutting rod 16 to slide on the strip plate 14 and push the rocker plate 18 to deflect on the rotating block 48 of the strip plate 14, causing the upper end of the rocker plate 18 to push the second abutting rod 19 to slide on the cleaning seat 4. On the one hand, when the second abutting rod 19 moves, it abuts against the third abutting rod 27, causing the third abutting rod 27 to move vertically on the cleaning seat 4, thus achieving the purpose of the third abutting rod 27 abutting against the abutting frame 26. The contact frame 26 drives the inverted rack 25 to move horizontally on the top of the cleaning seat 4. The fourth spring 261 stores power. When the inverted rack 25 meshes with the gear 24, the gear 24 drives the connecting shaft 23 to rotate on the cleaning seat 4, so that the cover plate 8 can automatically open from the opening of the cleaning seat 4. On the other hand, during the movement of the second contact rod 19, it can drive the mounting plate 6 connected to the sliding bracket 21 to move synchronously inside the cleaning seat 4, so that several cleaning brushes 7 can extend out of the cleaning seat 4 and abut against the welding surface of the main tube. Then the servo motor 28 is started, so that the electric chuck 2 and the main tube can rotate synchronously, so as to achieve the purpose of cleaning the welding surface of the main tube. This is beneficial to the treatment of impurities on the welding surface of the main tube, so as to improve the welding quality. At the same time, the suction cover 5 on the cleaning seat 4 is connected to the dust collection equipment, which removes the cleaned impurities and residual impurities attached to the welding surface of the main tube during the cleaning process, so as to improve the welding quality. When the piston rod of the electric push rod 9 extends, it can drive the first contact wedge 10 to move synchronously, so that the first contact wedge 10 abuts against the second contact wedge 31. The second contact wedge 31 automatically slides on the C-shaped frame 13 under force. The sixth spring 32 stores force so that the first contact wedge 10 moves to the other side of the second contact wedge 31. The limiting bracket 12, which is slidably connected to the L-shaped hollow column 11, is adjusted according to the welding height of the second flange ring and then firmly fixed to the L-shaped hollow column 11 by the locking screw 49. After cleaning is completed, the piston rod of the electric push rod 9 retracts, so that the cleaning seat 4 is reset. At this time, the first flange ring is put on the main pipe and moved downward so that the lower end face of the first flange ring is flush with the lower end face of the main pipe. After the cleaning seat 4 is reset, the piston rod of the electric push rod 9 continues to retract, so that the first contact wedge 10 hooks the second contact wedge 31. The movement is achieved because the elastic force of the sixth spring 32 is greater than that of the fifth spring 30, which enables the L-shaped frame 13 to slide on the guide rod 29. The fifth spring 30 stores energy so that the limiting bracket 12 automatically abuts against the main pipe. At the same time, the first spring 15 on the piston rod of the electric push rod 9 stores energy to put the second flange ring on the main pipe and move it down to abut against the limiting bracket 12, which facilitates the positioning of the second flange ring. The two welding guns 47 can be connected to the robotic arm or the electric push rod to adjust the position of the two welding guns 47 so that the two welding guns 47 move to the weld between the first flange ring and the second flange ring and the main pipe for welding. At the same time, the servo motor 28 drives the electric chuck 2 to rotate again, welding the first flange ring and the second flange ring onto the main pipe at the same time. The whole welding process is time-saving, labor-saving, convenient and fast, and improves the welding efficiency of the pipe expansion joint. When welding is completed, the piston rod of the electric push rod 9 continues to retract. At this time, the limit bracket 12 cannot move and remains stationary synchronously with the shaped frame 13. When the first abutting wedge 10 continues to move, it abuts against the second abutting wedge 31, causing the second abutting wedge 31 to retract on the shaped frame 13. The first abutting wedge 10 moves to one side of the second abutting wedge 31, thereby releasing the abutting state. The fifth spring 30 releases its elastic force so that the shaped frame 13 can be reset.

[0037] Example 2 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1 to 9 A conical abutment head 44 is slidably connected to the cleaning seat 4, and a ninth spring 45 is connected between the conical abutment head 44 and the cleaning seat 4. A third abutment wedge block 46 is fixed to the back of the mounting plate 6.

[0038] refer to Figures 3 to 6To improve the cleaning effect, when the mounting plate 6 moves several cleaning brush blocks 7 out of the cleaning seat 4, the third contact wedge 46 fixed on the back of the mounting plate 6 is located directly above the conical contact head 44. When the electric chuck 2 drives several L-shaped finger clips 3 to rotate, it can achieve intermittent contact with the conical contact head 44, causing the conical contact head 44 to move upward and contact the third contact wedge 46. The ninth spring 45 continuously stores and releases its elastic force so that the mounting plate 6 can move horizontally back and forth on the sliding bracket 21. The third spring 22 continuously stores and releases its elastic force so that several cleaning brush blocks 7 can clean the surface of the main pipe repeatedly, greatly improving the quality and efficiency of cleaning.

[0039] Example 3 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1 to 9 The cleaning seat 4 is equipped with a comb 33, and a fourth abutment rod 34 is fixed on one side of the comb 33. The fourth abutment rod 34 is elastically connected to the cleaning seat 4 through a seventh spring 35. A scraper 36 is fixed at the lower end of the comb 33, and a filter plate 37 is fixed on the adsorption cover 5.

[0040] The cleaning seat 4 is provided with slag discharge ports 38 on both sides. An L-shaped baffle 39 is provided on one side of the slag discharge port 38. The L-shaped baffle 39 is elastically connected to the cleaning seat 4 through an eighth spring 40. Two collection boxes 41 are fixed on the base 1 and are located on both sides of the cleaning seat 4.

[0041] A strip rod 42 is slidably connected to the base 1. The lower end of the strip rod 42 is fixed to the U-shaped frame 13, and a wave-shaped contact plate 43 is fixed on the strip rod 42.

[0042] refer to Figures 3 to 8During the cleaning process, some impurities easily adhere to the inside of the cleaning brush block 7 and cannot be sucked up, so the cleaning brush block 7 needs to be cleaned. At the same time, the filter plate 37 on the adsorption cover 5 is used to prevent large impurities from entering the dust collection equipment to prevent damage to the equipment. Impurities easily adhere to the surface of the filter plate 37, affecting the adsorption effect, so it also needs to be cleaned in time. During the resetting process of the cleaning seat 4, the L-shaped baffle 39 abuts against the collection box 41 and slides on the cleaning seat 4. The eighth spring 40 stores force, which can realize the purpose of automatically opening the slag discharge port 38 and connecting it with the feed port of the collection box 41. When the shaped frame 13 drives the L-shaped hollow column When moving horizontally, the bar 42 moves synchronously, causing the wave-shaped contact plate 43 on the bar 42 to intermittently contact the fourth contact rod 34. The fourth contact rod 34 drives the comb 33 to reciprocate within the cleaning seat 4, combing away the impurities remaining on several cleaning brush blocks 7, improving the self-cleaning effect of the cleaning brush blocks 7. At the same time, as the scraper 36 at the lower end of the comb 33 moves, on the one hand, the scraper 36 pushes the impurities at the bottom of the cleaning seat 4 to one side of the cleaning seat 4, and discharges them into the collection box 41 through the slag discharge port 38. On the other hand, the scraper 36 scrapes away the impurities attached to the filter plate 37, improving the dust collection effect.

[0043] The electric chuck 2, electric push rod 9, and servo motor 28 are all electrically connected to the controller via wires.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A welding device for pipe expansion joints, comprising a base (1), characterised in that: The base (1) is rotatably connected with an electric chuck (2), the electric chuck (2) is provided with a plurality of L-shaped finger clamps (3), one side of the base (1) is provided with a movable cleaning seat (4), the cleaning seat (4) is installed with a suction cover (5), and the cleaning seat (4) is provided with a movable mounting plate (6), a plurality of cleaning brush blocks (7) are fixed on the mounting plate (6), and both sides of the cleaning seat (4) are provided with rotatable cover plates (8). The bottom of the base (1) is fixed with an electric push rod (9), one side of the base (1) is provided with a movable L-shaped hollow column (11), the L-shaped hollow column (11) is slidably connected with a limiting support (12), one end of the L-shaped hollow column (11) is fixed with a U-shaped frame (13), and the base (1) is provided with two movable welding guns (47).

2. The pipe expansion joint welding apparatus of claim 1, wherein: The base (1) is fixed with a servo motor (28), the motor shaft of the servo motor (28) is fixedly connected with the electric chuck (2), the base (1) is fixed with a guide rod (29), the L-shaped hollow column (11) is elastically connected with the guide rod (29) through a fifth spring (30), and the L-shaped hollow column (11) is threadedly connected with a locking screw (49).

3. The pipe coupling welding apparatus of claim 1, wherein: The piston rod of the electric push rod (9) is fixed with a first abutting wedge (10), one side of the U-shaped frame (13) is slidably connected with a second abutting wedge (31), and the second abutting wedge (31) is elastically connected with the U-shaped frame (13) through a sixth spring (32).

4. The pipe coupling welding apparatus of claim 1, wherein: The bottom of the cleaning seat (4) is fixed with a strip-shaped plate (14), the strip-shaped plate (14) is slidably connected on the base (1), and the strip-shaped plate (14) is elastically connected with the piston rod of the electric push rod (9) through a first spring (15), the strip-shaped plate (14) is slidably connected with a first abutting rod (16), one end of the first abutting rod (16) is fixed with a limiting block (17), and one end of the first abutting rod (16) abuts against a warped plate (18).

5. The pipe expansion joint welding apparatus of claim 4, wherein: The strip-shaped plate (14) is installed with a rotating block (48), the warped plate (18) is rotatably connected on the rotating block (48), and the warped plate (18) abuts against a second abutting rod (19), the second abutting rod (19) is elastically connected with the cleaning seat (4) through a second spring (20), the second abutting rod (19) is fixed with a sliding support (21), and the sliding support (21) is elastically connected with the mounting plate (6) through a third spring (22).

6. The pipe coupling welding apparatus of claim 5, wherein: The cover plate (8) is fixed with a connecting shaft (23), the connecting shaft (23) is rotatably connected to the cleaning seat (4), and the connecting shaft (23) is fixed with a gear (24), the gear (24) is engaged with a U-shaped rack (25), the U-shaped rack (25) is fixed with a resisting frame (26), the resisting frame (26) is elastically connected to the cleaning seat (4) through a fourth spring (261), the resisting frame (26) is abutted with a third resisting rod (27), the third resisting rod (27) is slidably connected to the cleaning seat (4), and the lower end of the third resisting rod (27) is abutted with the second resisting rod (19).

7. The pipe coupling welding apparatus of claim 1 wherein: The cleaning seat (4) is slidably connected with a conical resisting head (44), the conical resisting head (44) is connected with the cleaning seat (4) through a ninth spring (45), and the back surface of the mounting plate (6) is fixed with a third resisting wedge (46).

8. The pipe coupling welding apparatus of claim 1, wherein: The cleaning seat (4) is provided with a comb rack (33), one side of the comb rack (33) is fixed with a fourth resisting rod (34), the fourth resisting rod (34) is elastically connected to the cleaning seat (4) through a seventh spring (35), and the lower end of the comb rack (33) is fixed with a scraper (36), and the adsorption cover (5) is fixed with a filter plate (37).

9. The pipe expansion joint welding apparatus of claim 8, wherein: Both sides of the cleaning seat (4) are provided with a residue discharge port (38), one side of the residue discharge port (38) is provided with an L-shaped baffle (39), the L-shaped baffle (39) is elastically connected to the cleaning seat (4) through an eighth spring (40), and the base (1) is fixed with two collecting boxes (41), and the two collecting boxes (41) are located on both sides of the cleaning seat (4).

10. The pipe coupling welding apparatus of claim 1, wherein: The base (1) is slidably connected with a strip-shaped rod (42), the lower end of the strip-shaped rod (42) is fixed on the U-shaped frame (13), and the strip-shaped rod (42) is fixed with a wave resisting plate (43).

Images