Iron cable reel welding assembly and welding equipment

Abstract

The invention discloses an iron cable reel welding assembly and welding equipment, and relates to the field of welding equipment.The iron cable reel welding assembly is characterized in that an inner welding pipeline and an outer welding pipeline are arranged inside and outside in a nested mode, each of the inner welding pipeline and the outer welding pipeline is of an annular pipeline structure, and the inner welding pipeline communicates with the outer welding pipeline through a connecting air pipe; and a plurality of groups of welding mechanisms are arranged. The inner welding pipeline and the outer welding pipeline communicate with the second pipelines, gas for welding can be sequentially fed into the multiple second pipelines through the inner welding pipeline and the outer welding pipeline, flames are jetted at the ends of the multiple second pipelines at the same time, and therefore the ends of the multiple reinforcing rib plates are welded, and the purpose of one-time welding is achieved; one-by-one welding is not needed, so that the welding efficiency is improved; and the operating rod is held by hand to rotate the inner welding pipeline and the outer welding pipeline, so that the second pipeline moves along a welding seam at the end part of the reinforcing rib plate, and the welding seam is welded.

Description

Technical Field

[0001] The present invention relates to the field of welding equipment, and particularly to a welding assembly and welding equipment for an iron cable reel. Background Art

[0002] An iron cable reel generally includes an inner disk, reinforcing rib plates, and an outer ring. The outer ring is sleeved outside the inner disk, and the inner ring of the outer ring and the outer ring of the inner disk are fixedly welded through the reinforcing rib plates. This is the side plate structure of the iron cable reel. In the prior art, when welding the reinforcing rib plates, manual assistance is usually used, and then welding is gradually carried out one by one, resulting in low welding efficiency.

[0003] Therefore, it is necessary to propose a welding assembly and welding equipment for an iron cable reel to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a welding assembly and welding equipment for an iron cable reel to solve the problem in the prior art that when welding the reinforcing rib plates, manual assistance is usually used, and then welding is gradually carried out one by one, resulting in low welding efficiency.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A welding assembly for an iron cable reel, comprising:

[0006] An inner welding pipe and an outer welding pipe which are nested inside and outside, both the inner welding pipe and the outer welding pipe are in an annular pipe structure, and the inner welding pipe and the outer welding pipe are communicated through a connecting air pipe;

[0007] A welding mechanism, several groups of welding mechanisms are arranged in a circular array on the upper surfaces of the inner welding pipe and the outer welding pipe;

[0008] The inner welding pipe and the outer welding pipe are rotatably arranged, and when the inner welding pipe and the outer welding pipe rotate, the welding mechanism is used to weld the welding part of the iron cable reel.

[0009] Preferably, a second pipe, a monitoring unit, and an electric igniter are integrally arranged on the welding mechanism;

[0010] Among them, the second pipe discharges the welding gas;

[0011] The electric igniter ignites the second pipe;

[0012] An ultrasonic flaw detector, an infrared thermal imaging camera, and a camera for a visual positioning system are integrally arranged in the monitoring unit;

[0013] Among them, the ultrasonic flaw detector monitors the internal defects of the weld seam in real time;

[0014] The infrared thermal imaging camera monitors the temperature distribution around the weld in real time;

[0015] The camera of the vision positioning system is used to monitor the welding position.

[0016] Preferably, the welding mechanism includes a welding plate, and both the electric igniter and the monitoring unit are installed on the upper surface of the welding plate. A support substrate and a first pipe are also fixedly arranged on the welding plate. The upper end of the first pipe is communicated with a hose, and the upper end of the hose is communicated with a second pipe. An electric push rod is fixedly installed on one side of the support substrate, and a connecting ring is installed at the end of the electric push rod. The connecting ring is snap-connected to the outer circle of the second pipe.

[0017] Preferably, the bottom of the first pipe is communicated with the inside of the outer welding pipe or the inner welding pipe. A ferrule is arranged at the bottom of the welding plate, and the ferrule is snap-connected to the outer welding pipe or the inner welding pipe. A control unit is arranged in the first pipe, and a temperature sensor and a flow control valve are integrated in the control unit.

[0018] The present invention also discloses a welding device, including an iron cable reel welding assembly, and further including:

[0019] A welding table and a base arranged up and down, and a blower and a gas tank are arranged between the welding table and the base;

[0020] Among them, the gas tank is used to store welding gas. A main pipe is arranged on the welding table, and the main pipe is communicated with a connecting air pipe. The end of the main pipe far away from the connecting air pipe is respectively provided with a first auxiliary pipe and a second auxiliary pipe. A delivery pump is arranged on the second auxiliary pipe, and the delivery pump is communicated with the inside of the gas tank. The first auxiliary pipe is connected to the blower.

[0021] Preferably, a positioning rod is fixedly welded in the middle of the upper surface of the welding table, and an adjusting disc is connected to the positioning rod by thread fit;

[0022] Among them, the inner disc on the iron cable reel passes through the positioning rod and is supported above the adjusting disc;

[0023] A plurality of lifting rods are also fixedly welded on the upper surface of the welding table;

[0024] Among them, the reinforcing rib plate on the iron cable reel is supported on the lifting rods;

[0025] A plurality of positioning grooves are arranged on the upper surface of the welding table;

[0026] Among them, the outer ring on the iron cable reel is fixed in the positioning grooves.

[0027] Preferably, the iron cable reel has a rotating support plate, a rotating support seat is rotatably connected to the rotating support plate, and an iron wheel is rotatably arranged on the rotating support seat. The iron wheel is snap-connected to the positioning grooves.

[0028] Preferably, an inner support plate is movably arranged in the positioning groove, an electric cylinder is fixedly arranged on the upper surface of the base, the top of the electric cylinder is fixedly arranged on the bottom surface of the inner support plate, and the inner support plate supports under the iron wheel.

[0029] Preferably, the base and the welding table are supported and fixed by a support plate;

[0030] An operating rod is fixedly arranged on the outer ring of the outer welding pipe.

[0031] Preferably, a slide rail is fixedly arranged on the upper surface of the welding table;

[0032] Suspension supports are fixedly arranged at the lower ends of the inner welding pipe and the outer welding pipe, a guide wheel is rotatably installed at the lower end of the suspension support, and the guide wheel is slidably arranged in the slide rail.

[0033] The technical effects and advantages of the present invention:

[0034] 1. In the present invention, both the inner welding pipe and the outer welding pipe are communicated with the second pipe, and the welding gas can be sequentially sent into a plurality of second pipes through the inner welding pipe and the outer welding pipe, so that the ends of the plurality of second pipes spray flames simultaneously, thereby welding the ends of multiple reinforcing rib plates, achieving the purpose of one-time welding, without welding one by one, improving the welding efficiency; and by holding the operating rod to rotate the inner welding pipe and the outer welding pipe, the second pipe moves along the weld at the end of the reinforcing rib plate, thereby welding the weld;

[0035] 2. When the connecting ring is pushed by the electric push rod, the connecting ring can drive the second pipe to move, thereby adjusting the position of the second pipe, and can be used in combination with the monitoring unit to automatically adjust the welding position, avoiding the phenomenon of weld offset when welding multiple places simultaneously;

[0036] 3. The control unit integrates a temperature sensor and a flow control valve, and can automatically adjust the flame intensity and the flow rate of the welding gas according to the real-time monitored welding position, ensuring that the welding parameters at different positions are adaptively matched, and improving the welding consistency;

[0037] 4. The air-cooling process is also a process of reverse blowing and blocking inside the second pipe, avoiding the phenomenon that welding slag and the like fall into the second pipe to form blockage, reducing the frequency of shutdown maintenance, and prolonging the service life of the equipment;

[0038] 5. The setting of the slide rail ensures that the inner welding pipe and the outer welding pipe can rotate around a circle, which is particularly suitable for welding iron cable reels. After welding, the electric cylinder can be started to move the iron cable reel out from above the positioning rod. After moving out, starting the electric cylinder on one side alone can also make the iron cable reel tilt, facilitating the taking and placing of the iron cable reel;

[0039] 6. When the rotating support base is in the first position, it is convenient to place the iron cable reel above the welding table for welding. When the rotating support base is in the second position, it is convenient for the iron cable reel to roll and transport; and the iron wheel is equipped with a wheel brake, which is convenient for positioning and fixing and makes transportation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of the first perspective of the welding equipment of the present invention.

[0041] Figure 2 It is a schematic structural diagram of the second perspective of the welding equipment of the present invention.

[0042] Figure 3 It is a cross-sectional view of the welding equipment of the present invention.

[0043] Figure 4 For the present invention Figure 3 Schematic enlarged view of the structure at A in

[0044] Figure 5 It is a schematic structural diagram of the welding equipment of the present invention when welding an iron cable reel.

[0045] Figure 6 It is a cross-sectional view of the welding equipment of the present invention when welding an iron cable reel.

[0046] Figure 7 It is a top view of the welding equipment of the present invention when welding an iron cable reel.

[0047] Figure 8 It is a schematic structural diagram of the iron cable reel welding assembly of the present invention.

[0048] Figure 9 For the present invention Figure 8 Schematic enlarged view of the structure at B in

[0049] In the figure: 1. Base; 2. Welding table; 3. Support plate; 4. Positioning groove; 5. Inner welding pipe; 6. Outer welding pipe; 7. Operating rod; 8. Lifting rod; 9. Welding mechanism; 10. Positioning rod; 11. Adjusting disc; 12. Electric cylinder; 13. Fan; 14. Gas tank; 15. Main pipe; 16. First auxiliary pipe; 17. Delivery pump; 18. Second auxiliary pipe; 19. Inner support plate; 20. Inner disc; 21. Reinforcing rib plate; 22. Outer ring; 23. Rotating support plate; 24. Rotating support base; 25. Iron wheel; 26. Connecting air pipe; 27. Slide rail; 28. Suspended support frame; 29. Guide wheel; 30. First pipe; 31. Control unit; 32. Support substrate; 33. Electric push rod; 34. Hose; 35. Second pipe; 36. Electric igniter; 37. Welding plate; 38. Ferrule; 39. Monitoring unit; 40. Connecting ring. Detailed implementation mode

[0050] The present invention provides an iron cable reel welding assembly and welding equipment as shown in Figures 1 - 9 . The welding equipment is dedicated to efficiently welding the iron cable reel, improving the welding efficiency of the iron cable reel.

[0051] Specifically, as shown in Figure 5 , the iron cable reel includes an inner disk 20, an outer ring 22 and reinforcing rib plates 21. The outer ring 22 is sleeved outside the inner disk 20. A plurality of reinforcing rib plates 21 are provided. The plurality of reinforcing rib plates 21 are arranged in a circular array between the inner circle of the outer ring 22 and the outer circle of the inner disk 20. Both ends of the reinforcing rib plates 21 are fixedly welded between the inner circle of the outer ring 22 and the outer circle of the inner disk 20.

[0052] The present invention first provides an iron cable reel welding assembly as shown in Figures 1 to 4 , Figure 8 and Figure 9 . The iron cable reel welding assembly includes an inner welding pipe 5 and an outer welding pipe 6. Both the inner welding pipe 5 and the outer welding pipe 6 are in the shape of an annular pipe structure. The outer welding pipe 6 is arranged around the outside of the inner welding pipe 5. The inner circle of the outer welding pipe 6 and the outer circle of the inner welding pipe 5 are fixed and communicated with each other through a connecting air pipe 26. A plurality of groups of welding mechanisms 9 are arranged on the upper surfaces of the inner welding pipe 5 and the outer welding pipe 6. The second pipe 35, the monitoring unit 39 and the electric igniter 36 are integrally arranged on the welding mechanism 9. The second pipe 35 can discharge the welding gas. The second pipe 35 can be ignited by the electric igniter 36, so that a flame is ejected from the end of the second pipe 35, thereby welding the end of the reinforcing rib plate 21. In the present invention, the inner welding pipe 5 and the outer welding pipe 6 are both communicated with the second pipe 35, and the welding gas can be sent into a plurality of second pipes 35 in sequence through the inner welding pipe 5 and the outer welding pipe 6, so that flames are ejected from the ends of the plurality of second pipes 35 at the same time, thereby welding the ends of multiple reinforcing rib plates 21, achieving the purpose of one-time welding, without welding one by one, and improving the welding efficiency.

[0053] And the iron cable reel welding assembly is arranged on the welding equipment. The welding equipment includes a base 1 and a welding table 2. The base 1 is arranged at the bottom of the welding table 2. The base 1 and the welding table 2 are fixedly connected through a support plate 3. A blower 13 and a gas tank 14 are arranged between the base 1 and the welding table 2. The gas tank 14 is used for storing the welding gas. A main pipe 15 is arranged on the welding table 2. The main pipe 15 is communicated with the connecting air pipe 26. One end of the main pipe 15 far away from the connecting air pipe 26 is respectively provided with a first auxiliary pipe 16 and a second auxiliary pipe 18. A delivery pump 17 is arranged on the second auxiliary pipe 18. The delivery pump 17 is communicated with the inside of the gas tank 14. The first auxiliary pipe 16 is connected with the blower 13.

[0054] During welding, the iron cable drum is first set up above the welding table 2, and multiple welding mechanisms 9 are directly opposite to the ends of multiple reinforcing ribs 21. Among them, the outer ring of the outer welding pipe 6 is also fixedly welded with an operating rod 7. During the welding process, the welding gas stored in the gas tank 14 is first pumped into the second auxiliary pipe 18 through the delivery pump 17. The welding gas passes through the main pipeline 15, the connecting gas pipe 26, the inner welding pipe 5, and the outer welding pipe 6 in turn and enters the corresponding second pipe 35. The second pipe 35 is ignited by the electric igniter 36, and a flame is ejected from the end of the second pipe 35, so as to weld the end of the reinforcing rib 21. The inner welding pipe 5 and the outer welding pipe 6 are rotated by holding the operating rod 7, so that the second pipe 35 moves along the weld at the end of the reinforcing rib 21, so as to weld the weld.

[0055] refer to Figure 4 and Figure 9 As shown in the figure, the welding mechanism 9 also includes a welding plate 37, an electric igniter 36 and a monitoring unit 39 are both installed on the upper surface of the welding plate 37, a supporting base plate 32 and a first pipe 30 are also fixedly arranged on the welding plate 37, a hose 34 is connected to the upper end of the first pipe 30, and the upper end of the hose 34 is connected to the second pipe 35, an electric push rod 33 is fixedly installed on one side of the supporting base plate 32, a connecting ring 40 is installed at the end of the electric push rod 33, and the connecting ring 40 is snap-connected to the outer ring of the second pipe 35. When the connecting ring 40 is pushed by the electric push rod 33, the connecting ring 40 can drive the second pipe 35 to move, thereby adjusting the position of the second pipe 35, and can be used in combination with the monitoring unit 39 to automatically adjust the welding position to avoid the phenomenon of weld offset when welding multiple places at the same time.

[0056] Furthermore, the monitoring unit 39 is integrated with an ultrasonic flaw detector, an infrared thermal imaging camera and a camera for a visual positioning system.

[0057] Among them, ultrasonic flaw detectors can monitor internal defects of welds in real time;

[0058] Infrared thermal imaging cameras can monitor the temperature distribution around the weld in real time, provide real-time feedback on welding quality, and reduce the defective rate;

[0059] The visual positioning system uses a camera to monitor the welding position and can automatically plan the welding path and correct the offset to achieve automatic high-precision welding; for example, when the visual positioning system uses a camera to detect an abnormality in the welding position, this information can be fed back to the control chip, and the control chip controls the adjustment of the position of the second pipe 35. The control chip is an existing common technology and will not be described in detail here.

[0060] It should be noted that during actual use, the ultrasonic flaw detector, infrared thermal imaging camera, and vision positioning system can be connected to the display screen through a camera, integrated with an Internet of Things module, store the process parameters and quality data of each welding, and recommend the optimal parameter combination through machine learning algorithms.

[0061] The bottom of the first pipe 30 communicates with the inside of the outer welding pipe 6 or the inner welding pipe 5. A ferrule 38 is provided at the bottom of the welding plate 37, and the ferrule 38 is snap-fitted into the outer welding pipe 6 or the inner welding pipe 5. A control unit 31 is provided in the first pipe 30. The control unit 31 integrates a temperature sensor and a flow control valve, and can automatically adjust the flame intensity and the gas flow for welding according to the real-time monitored welding position, ensuring that the welding parameters at different positions are adaptively matched and improving the welding consistency.

[0062] In the present invention, after welding, the welded part of the iron cable reel can be quickly cooled at the second pipe 35. Specifically, the blower 13 is started, and the blower 13 conveys cold air to the corresponding second pipe 35 through the first auxiliary pipe 16, the main pipe 15, the connecting air pipe 26, the inner welding pipe 5, and the outer welding pipe 6 in sequence, so as to perform air cooling on the welding position. And during the air cooling process, it is also a process of reverse blowing and blocking inside the second pipe 35, avoiding the phenomenon that welding slag and the like fall into the second pipe 35 to form a blockage, reducing the frequency of shutdown maintenance, and prolonging the service life of the equipment.

[0063] On the upper surface of the welding table 2 in the present invention, a slide rail 27 is further fixedly provided. The lower surfaces of the outer welding pipe 6 and the inner welding pipe 5 are both fixedly provided with suspended support frames 28. A guide wheel 29 is rotatably provided at the lower end of the suspended support frame 28, and the guide wheel 29 is rollingly provided in the slide rail 27. The setting of the slide rail 27 ensures that the inner welding pipe 5 and the outer welding pipe 6 can rotate around a circle, which is particularly suitable for welding the iron cable reel.

[0064] Reference Figures 1 to 9As shown in the figure, a positioning rod 10 is fixedly welded in the middle of the upper surface of the welding table 2. An adjusting disc 11 is connected to the positioning rod 10 by thread fit. A plurality of lifting rods 8 are also fixedly welded on the upper surface of the welding table 2. When erecting an iron cable reel, first pass the hole in the middle of the inner disc 20 through the positioning rod 10. The bottom of the inner disc 20 is seated on the upper surface of the adjusting disc 11. A rotating support plate 23 is fixedly welded on the side surface of the outer ring 22. A rotating support seat 24 is rotatably arranged on the rotating support plate 23. An iron wheel 25 is rotatably arranged on the rotating support seat 24. The rotating support seat 24 is fixed to the rotating support plate 23 by a pin. Rotate the rotating support seat 24 perpendicular to the side surface of the outer ring 22. The iron wheel 25 is engaged in the positioning groove 4 on the upper surface of the welding table 2 to complete the fixation of the outer ring 22. Then, a plurality of reinforcing ribs 21 are supported above the lifting rods 8. One end of the reinforcing rib 21 is attached to the inner ring of the outer ring 22, and the other end of the reinforcing rib 21 is attached to the outer ring of the inner disc 20. A magnetic block for adsorbing and fixing the reinforcing rib 21 is arranged above the lifting rod 8. Therefore, the reinforcing rib 21 can be stably lifted above the lifting rod 8.

[0065] It should also be noted that a positioning groove 4 is provided above the welding table 2. There are eight positioning grooves 4, and the eight positioning grooves 4 are arranged in a circular array on the welding table 2. The positioning groove 4 penetrates the upper and lower surfaces of the welding table 2 at the same time. An electric cylinder 12 is fixedly arranged on the upper surface of the base 1. The upper end of the electric cylinder 12 is fixedly provided with an inner support plate 19. The inner support plate 19 is slidably arranged in the positioning groove 4. The bottom of the iron wheel 25 is lifted by the inner support plate 19. Starting the electric cylinder 12 can finely adjust the support height of the outer ring 22.

[0066] Rotating the adjusting disc 11 can adjust the support height of the inner disc 20 to adapt to the specific size of the iron cable reel.

[0067] After welding, the electric cylinder 12 can also be started to move the iron cable reel out from above the positioning rod 10. After moving out, starting the electric cylinder 12 on one side alone can also tilt the iron cable reel, which is convenient for taking and placing the iron cable reel.

[0068] In the present invention, a rotating support plate 23, a rotating support seat 24 and an iron wheel 25 are installed on the side of the iron cable reel. The rotating support plate 23 and the rotating support seat 24 can be fixed by a pin. The rotating support seat 24 has two fixed positions. The first position: located on the side surface of the outer ring 22. The second position: located at the outer circle of the outer ring 22. Therefore, when the rotating support seat 24 is in the first position, it is convenient to erect the iron cable reel above the welding table 2 for welding. When the rotating support seat 24 is in the second position, it is convenient for the iron cable reel to roll and transport; and the iron wheel 25 is equipped with a wheel brake, which is convenient for positioning and fixing and is more convenient for transportation.

[0069] As an extension, during transportation, the outer ring 22 can be placed at the position shown in Figure 5 . The iron wheels 25 on the side of the outer ring 22 are in contact with the ground, taking into account the purpose of facilitating transportation and movement.

Claims

1. An iron cable reel welding assembly, characterized in that, Comprising: An inner welding pipe (5) and an outer welding pipe (6) which are nested inside and outside. Both the inner welding pipe (5) and the outer welding pipe (6) are in a circular pipe structure, and they are connected by a connecting air pipe (26); A welding mechanism (9). There are several groups of the welding mechanisms (9), and several groups of welding mechanisms (9) are distributed in a circular array on the upper surfaces of the inner welding pipe (5) and the outer welding pipe (6); The inner welding pipe (5) and the outer welding pipe (6) are rotatably arranged. When the inner welding pipe (5) and the outer welding pipe (6) rotate, the welding mechanism (9) is used to weld the to-be-welded part of the iron cable reel.

2. The welded assembly of an iron cable reel according to claim 1, wherein: The welding mechanism (9) is integrally arranged with a second pipe (35), a monitoring unit (39) and an electric igniter (36); Among them, the second pipe (35) is for discharging the welding gas; The electric igniter (36) ignites the second pipe (35); The monitoring unit (39) is integrally provided with an ultrasonic flaw detector, an infrared thermal imaging camera and a camera for the visual positioning system; Among them, the ultrasonic flaw detector monitors the internal defects of the weld seam in real time; The infrared thermal imaging camera monitors the temperature distribution around the weld seam in real time; The camera for the visual positioning system is used to monitor the welding position.

3. The iron cable reel welding assembly according to claim 2, wherein: The welding mechanism (9) includes a welding plate (37). The electric igniter (36) and the monitoring unit (39) are both installed on the upper surface of the welding plate (37). A support substrate (32) and a first pipe (30) are also fixedly arranged on the welding plate (37). The upper end of the first pipe (30) is connected with a hose (34), and the upper end of the hose (34) is connected with the second pipe (35). An electric push rod (33) is fixedly installed on one side of the support substrate (32), and a connecting ring (40) is installed at the end of the electric push rod (33). The connecting ring (40) is snap-connected to the outer circle of the second pipe (35).

4. The welding assembly of an iron cable reel according to claim 3, characterized in that: The bottom of the first pipe (30) is communicated with the inside of the outer welding pipe (6) or the inner welding pipe (5). A ferrule (38) is arranged at the bottom of the welding plate (37), and the ferrule (38) is snap-connected to the outer welding pipe (6) or the inner welding pipe (5). A control unit (31) is arranged in the first pipe (30), and a temperature sensor and a flow control valve are integrated in the control unit (31).

5. A welding device, characterized in that: Comprising a welding assembly for an iron cable reel according to any one of claims 1-4, further comprising: A welding table (2) and a base (1) arranged up and down. A blower (13) and a gas tank (14) are arranged between the welding table (2) and the base (1); Among them, the gas tank (14) is used for storing the welding gas. A main pipe (15) is arranged on the welding table (2), and the main pipe (15) is communicated with the connecting air pipe (26). A first auxiliary pipe (16) and a second auxiliary pipe (18) are respectively arranged at one end of the main pipe (15) far away from the connecting air pipe (26). A delivery pump (17) is arranged on the second auxiliary pipe (18), and the delivery pump (17) is communicated with the inside of the gas tank (14). The first auxiliary pipe (16) is connected with the blower (13).

6. The welding device according to claim 5, wherein: A positioning rod (10) is fixedly welded to the middle of the upper surface of the welding table (2), and an adjusting disc (11) is connected to the positioning rod (10) by threaded fit; Among them, the inner disc (20) on the iron cable reel passes through the positioning rod (10) and is supported above the adjusting disc (11); A plurality of lifting rods (8) are also fixedly welded to the upper surface of the welding table (2); Among them, the reinforcing rib plate (21) on the iron cable reel is supported on the lifting rod (8); A plurality of positioning grooves (4) are arranged on the upper surface of the welding table (2); Among them, the outer ring (22) on the iron cable reel is fixed in the positioning groove (4).

7. A welding device according to claim 6, characterized in that: The iron cable reel has a rotating support plate (23), a rotating support seat (24) is rotatably connected to the rotating support plate (23), an iron wheel (25) is rotatably arranged on the rotating support seat (24), and the iron wheel (25) is engaged in the positioning groove (4).

8. A welding device according to claim 7, characterized in that: An inner support plate (19) is movably arranged in the positioning groove (4), an electric cylinder (12) is fixedly arranged on the upper surface of the base (1), the top of the electric cylinder (12) is fixedly arranged on the bottom surface of the inner support plate (19), and the inner support plate (19) is supported under the iron wheel (25).

9. A welding device according to claim 5, characterized in that: The base (1) and the welding table (2) are supported and fixed by a support plate (3); An operating rod (7) is fixedly arranged on the outer ring of the outer welding pipe (6).

10. A welding device according to claim 5, characterized in that: A slide rail (27) is fixedly arranged on the upper surface of the welding table (2); Suspension support frames (28) are fixedly arranged at the lower ends of the inner welding pipe (5) and the outer welding pipe (6), a guide wheel (29) is rotatably installed at the lower end of the suspension support frame (28), and the guide wheel (29) is slidably arranged in the slide rail (27).

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