Welding device and method for corrugated pipe circular seam

Abstract

The invention relates to a welding device and method for a corrugated pipe circular seam, and belongs to the technical field of corrugated pipe welding.The welding device for the corrugated pipe circular seam comprises a welding table and a welding head, two coaxially-arranged circular rings are fixed to the welding table, and the welding head is located between the two circular rings; three carrier rollers used for clamping the corrugated pipe are arranged in the circular ring in a penetrating mode, a material conveying assembly used for conveying the corrugated pipe to the positions among the three carrier rollers is arranged on the side, away from the welding head, of the circular ring, air outlet pipes are arranged in the carrier rollers in a penetrating mode, and air outlets of the air outlet pipes extend out of the carrier rollers and face the weld joint of the corrugated pipe. A heating box and a sucking pump used for conveying inert gas into the heating box are arranged on the welding table, an electric heating wire is arranged in the heating box, and a gas conveying assembly used for connecting the sucking pump and the gas outlet pipe is arranged on the welding table; the device can preheat the part, close to a welding seam, of the corrugated pipe, reduce the temperature difference between a welding area and base metal, reduce thermal stress concentration and reduce deformation caused by local shrinkage of the corrugated pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of bellows welding, and particularly relates to a welding device and method for the circumferential seam of a bellows. Background Art

[0002] Bellows are widely used in fields such as pipeline connection, compensation, and sealing. Especially in industries such as petrochemical, electric power, metallurgy, and machinery, as key components that can withstand special requirements such as high pressure, high temperature, and corrosion resistance, they play a crucial role. Bellows usually adopt a corrugated shape design to adapt to dynamic working conditions such as thermal expansion and vibration, and have extremely high flexibility and strength. Therefore, they can effectively withstand various external forces and extreme working environments.

[0003] Traditional circumferential seam welding methods for bellows usually use manual welding or automatic welding. However, due to large temperature changes during the welding process, the bellows may deform, which in turn affects the final welding effect and makes it difficult to guarantee the welding quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a welding device for the circumferential seam of a bellows with a simple structure and reasonable design to solve the above problems.

[0005] The present invention achieves the above purpose through the following technical solutions: A welding device for the circumferential seam of a bellows includes a welding table and a welding system arranged on the welding table. The welding system includes a welding head. Two coaxially arranged rings are fixed on the welding table, and the welding head is located between the two rings. Three supporting rollers for clamping the bellows are arranged inside the rings. A feeding component for feeding the bellows between the three supporting rollers is arranged on the side of the ring away from the welding head. An air outlet pipe is arranged inside the supporting roller, and the air outlet of the air outlet pipe extends out of the supporting roller and is arranged towards the weld of the bellows. A heating box and an air extraction pump for conveying inert gas into the heating box are arranged on the welding table. An electric heating wire is arranged inside the heating box. An air conveying component for connecting the air extraction pump and the air outlet pipe is arranged on the welding table.

[0006] As a further optimized solution of the present invention, the gas transmission component includes an annular pipe fixed to the side surface of the ring. A connecting square pipe is connected to the outer peripheral surface of the annular pipe. A connecting circular pipe is connected between the two connecting square pipes. An air transmission pipe is connected between the connecting circular pipe and the heating box. The annular pipe is arranged along the circumferential direction of the ring. Three first square pipes are fixed to the inner peripheral surface of the annular pipe. A second square pipe is slidably installed in the first square pipe along the radial direction of the ring. A connecting sleeve is fixed to the side surface of the second square pipe close to the idler roller. The first square pipe is communicated with the connecting sleeve. The connecting sleeve is located inside the idler roller. The air outlet pipe sequentially passes through the connecting sleeve and the second square pipe. A plurality of first gas transmission through grooves are formed in the outer peripheral surface of the connecting sleeve. A plurality of second gas transmission through grooves are formed in the outer peripheral surface of the air outlet pipe. The plurality of second gas transmission through grooves are arranged at equal intervals along the circumferential direction of the air outlet pipe. The second gas transmission through grooves are located at one end of the air outlet pipe far from the connecting sleeve.

[0007] As a further optimized solution of the present invention, the outer peripheral surface of the idler roller is corrugated. The outer peripheral surface of the idler roller can be engaged with the outer peripheral surface of the corrugated pipe. Three moving plates are arranged inside the ring. A control component for controlling the radial movement of the moving plate along the ring is arranged on the ring. A support plate is fixed to the side surface of the moving plate close to the idler roller. The end surface of the idler roller far from the second square pipe is rotatably connected to the support plate.

[0008] As a further optimized solution of the present invention, two connecting rods are fixed to the side surface of the moving plate close to the ring. Connecting holes for passing through the connecting rods are formed in the inner peripheral surface of the ring. A control rod is fixed between the two connecting rods. The control component includes a control circular plate sleeved on the outer periphery of the ring. The control circular plate is rotatably connected to the ring. An arc-shaped groove is formed in the side surface of the control circular plate. The control rod passes through the arc-shaped groove. The control rod is slidably matched with the control circular plate through the arc-shaped groove. The distance between one end of the arc-shaped groove far from the connecting hole and the ring gradually increases.

[0009] As a further optimized solution of the present invention, a synchronous rod is fixed between the two control circular plates. An electric push rod is hinged to the top surface of the welding table. The end of the piston rod of the electric push rod is fixed with a synchronous block. The synchronous block is sleeved on the outer periphery of the synchronous rod. The synchronous block is rotatably connected to the synchronous rod.

[0010] As a further optimized solution of the present invention, a first motor is fixed to the top of the ring. The bottom end of the output shaft of the first motor is coaxially fixed with a telescopic sleeve. A support block is fixed to the side of the support plate at the top. A telescopic rod passes through the top surface of the support block. The telescopic rod is rotatably connected to the support block. A first bevel gear is coaxially fixed to the bottom end of the telescopic rod. A second bevel gear is coaxially fixed to the end of the idler roller. The first bevel gear meshes with the second bevel gear. A sliding block is fixed to the outer peripheral surface of the telescopic rod. A sliding through groove is formed in the outer peripheral surface of the telescopic sleeve. The sliding block is slidably matched with the telescopic sleeve in the vertical direction through the sliding through groove.

[0011] As a further optimized solution of the present invention, the feeding assembly includes a bearing table fixed to the top surface of the welding table. A plurality of groups of driving members are arranged on the top surface of the bearing table. The driving member includes two vertically arranged fixing plates. A bearing roller is rotatably installed between the two fixing plates. A moving block is installed at the top of the fixing plate. A driving rod is rotatably installed between the two moving blocks. A driving tube is sleeved and fixed on the outer peripheral surface of the driving rod. A plurality of driving plates are fixed to the outer peripheral surface of the driving tube. The plurality of driving plates are arranged at equal intervals along the circumferential direction of the driving tube. A pushing round rod is fixed to the side of the driving plate away from the driving tube. The pushing round rod can be inserted into the groove of the corrugated pipe. A second motor is fixed to the side of the fixing plate. The output end of the second motor is coaxially fixedly connected to the driving rod.

[0012] As a further optimized solution of the present invention, a moving groove is formed in the side of the fixing plate. The moving block is slidably matched with the fixing plate in the vertical direction through the moving groove. Sliding blocks are fixed to both sides of the moving block. Sliding grooves are formed in the opposite inner sides of the moving groove. The sliding blocks are slidably matched with the fixing plate in the vertical direction through the sliding grooves. A screw rod passes through the top surface of the fixing plate. The screw rod is threadedly connected to the fixing plate. The bottom end of the screw rod is rotatably connected to the top surface of the moving block.

[0013] A welding method for the circumferential seam of a corrugated pipe includes the following steps: S1. Start the second motor, and use the feeding assembly to convey the two corrugated pipes to the middle of the ring respectively, so that the ends of the two corrugated pipes are closely attached. S2. Start the electric push rod, and use the control assembly to move the three idler rollers towards the direction close to the corrugated pipe and clamp the corrugated pipe. S3. Start the air extraction pump, and convey the inert gas into the heating box. The inert gas is heated under the action of the heating wire. The heated inert gas enters the air outlet pipe through the air conveying assembly and is then conveyed to the weld of the two corrugated pipes. S4. Start the welding system, and the welding head welds the two corrugated pipes.

[0014] The beneficial effects of the present invention are as follows: The feeding component is used to convey two bellows to the middle of the ring respectively. Three rollers clamp the bellows, so that the ends of the two bellows are closely attached. The air extraction pump is used to convey inert gas into the heating box. The inert gas is heated under the action of the heating wire. The heated inert gas enters the air outlet pipe through the air conveying component and is then conveyed to the welds of the two bellows, providing a stable welding environment for the bellows, preventing the welding area from being oxidized. At the same time, the temperature of the rollers rises under the action of the inert gas, and then preheats the parts of the bellows near the welds, reducing the temperature difference between the welding area and the base material, reducing the concentration of thermal stress, and reducing the deformation of the bellows caused by local shrinkage. Brief Description of the Drawings

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the ring and the feeding component of the present invention; Figure 3 is a schematic diagram of the structure of the ring and the welding system of the present invention; Figure 4 is a schematic diagram of the structure of the feeding component of the present invention; Figure 5 is a schematic diagram of the structure of the roller and the control component of the present invention; Figure 6 is a schematic diagram of the structure of the roller and the moving plate of the present invention; Figure 7 is a schematic diagram of the structure of the control component and the air conveying component of the present invention; Figure 8 is a cross-sectional view of the roller of the present invention.

[0016] Reference numerals: 1, welding table; 11, welding system; 111, welding head; 2, feeding assembly; 21, carrying table; 22, driving member; 221, fixing plate; 222, carrying roller; 223, driving rod; 224, driving tube; 225, driving plate; 226, pushing round rod; 23, moving groove; 24, moving block; 25, slider; 26, sliding groove; 27, screw rod; 28, motor II; 3, mounting plate; 31, ring; 32, moving plate; 321, pressure sensor; 33, support plate; 34, connecting hole; 35, connecting rod; 36, control rod; 4, control assembly; 41, control round plate; 42, arc groove; 43, synchronizing rod; 44, electric push rod; 45, synchronizing block; 5, support block; 51, telescopic rod; 511, sliding block; 512, bevel gear I; 52, motor I; 53, telescopic sleeve; 531, sliding through groove; 6, supporting roller; 61, bevel gear II; 62, air outlet pipe; 621, air delivery through groove II; 7, heating box; 71, air extraction pump; 8, air delivery assembly; 81, annular pipe; 82, connecting square pipe; 83, connecting round pipe; 84, air delivery pipe; 85, square pipe I; 86, square pipe II; 87, connecting sleeve; 871, air delivery through groove I. Detailed implementation manners

[0017] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0018] Refer to Figure 1 , Figure 2 and Figure 3 , a welding device for the circumferential seam of a corrugated pipe includes a welding table 1 and a welding system 11 arranged on the welding table 1. The welding system 11 includes a welding head 111. Two mounting plates 3 are fixed on the top surface of the welding table 1, and two coaxially arranged rings 31 are fixed on the top surface of the mounting plates 3. The welding head 111 is located between the two rings 31. Three supporting rollers 6 for clamping the corrugated pipe are arranged in the rings 31, and a feeding assembly 2 for conveying the corrugated pipe to between the three supporting rollers 6 is arranged on the side of the rings 31 away from the welding head 111.

[0019] The feeding assembly 2 conveys two corrugated pipes to the middle of the rings 31 respectively, and the three supporting rollers 6 clamp the corrugated pipe in the rings 31, so that the ends of the two corrugated pipes are closely attached, facilitating the welding head 111 to weld the joint of the two corrugated pipes.

[0020] Refer to Figure 3 and Figure 4, the feeding component 2 includes a bearing platform 21 fixed to the top surface of the welding table 1, and several groups of driving components 22 are arranged on the top surface of the bearing platform 21. The driving component 22 includes two vertically arranged fixing plates 221, and a bearing roller 222 is rotatably installed between the two fixing plates 221. A moving groove 23 is formed on the side surface of the fixing plate 221, and a moving block 24 is slidably installed along the vertical direction through the moving groove 23 on the fixing plate 221. Sliders 25 are fixed on both sides of the moving block 24, and sliding grooves 26 are formed on the opposite inner sides of the moving groove 23. The sliders 25 are slidably matched with the fixing plate 221 along the vertical direction through the sliding grooves 26. A screw rod 27 penetrates through the top surface of the fixing plate 221, the screw rod 27 is threadedly connected with the fixing plate 221, and the bottom end of the screw rod 27 is rotatably connected with the top surface of the moving block 24.

[0021] Rotating the screw rod 27, the screw rod 27 can drive the moving block 24 to move vertically, so as to adjust the distance between the driving pipe 224 and the bearing roller 222, so as to adapt to bellows of different sizes.

[0022] Refer to Figure 4 , a driving rod 223 is rotatably installed between the two moving blocks 24, and a driving pipe 224 is sleeved and fixed on the outer peripheral surface of the driving rod 223. A plurality of driving plates 225 are fixed on the outer peripheral surface of the driving pipe 224, and the plurality of driving plates 225 are arranged at equal intervals along the circumferential direction of the driving pipe 224. A pushing round rod 226 is fixed on the side of the driving plate 225 away from the driving pipe 224, and the pushing round rod 226 can be inserted into the groove of the bellows. A second motor 28 is fixed on the side surface of the fixing plate 221, and the output end of the second motor 28 is coaxially fixed and connected with the driving rod 223.

[0023] Starting the second motor 28, the second motor 28 drives the driving rod 223 to rotate, the driving rod 223 drives a plurality of pushing round rods 226 to rotate, the bellows is located between the bearing roller 222 and the driving pipe 224, the pushing round rods 226 are sequentially inserted into the grooves of the bellows and drive the bellows to move, so as to convey the bellows to the middle of the ring 31.

[0024] Refer to Figure 5 and Figure 6 , the outer peripheral surface of the supporting roller 6 is corrugated, and the outer peripheral surface of the supporting roller 6 can be engaged with the outer peripheral surface of the bellows. Three moving plates 32 are arranged in the ring 31, and a pressure sensor 321 is arranged on the moving plate 32. A supporting plate 33 is fixed on the side surface of the moving plate 32 close to the supporting roller 6, the supporting roller 6 is rotatably connected with the supporting plate 33, and a control component 4 for controlling the moving plate 32 to move along the radial direction of the ring 31 is arranged on the ring 31. Two connecting rods 35 are fixed on the side surface of the moving plate 32 close to the ring 31, a connecting hole 34 for passing through the connecting rods 35 is formed on the inner peripheral surface of the ring 31, and a control rod 36 is fixed between the two connecting rods 35.

[0025] Refer to Figure 5 andFigure 7 , the control component 4 includes a control circular plate 41 sleeved on the outer periphery of the circular ring 31. The control circular plate 41 is rotatably connected to the circular ring 31, and an arc-shaped groove 42 is formed on the side surface of the control circular plate 41. The control rod 36 passes through the arc-shaped groove 42, and the control rod 36 is in sliding fit with the control circular plate 41 through the arc-shaped groove 42. The distance between the end of the arc-shaped groove 42 far from the connection hole 34 and the circular ring 31 gradually increases. An electric push rod 44 is hinged on the top surface of the welding table 1, and a synchronous block 45 is fixed at the end of the piston rod of the electric push rod 44. A synchronous rod 43 is fixed between the two control circular plates 41. The synchronous block 45 is sleeved on the outer periphery of the synchronous rod 43, and the synchronous block 45 is rotatably connected to the synchronous rod 43.

[0026] When the electric push rod 44 is started, the electric push drives the two control circular plates 41 to rotate through the synchronous block 45 and the synchronous rod 43. The control circular ring 31 drives the control rod 36 to move through the arc-shaped groove 42. The connection hole 34 limits the connecting rod 35, so that the connecting rod 35 moves along the radial direction of the circular ring 31, thereby driving the moving plate 32 to move along the radial direction of the circular ring 31. When the corrugated pipe has not reached the middle of the three idler rollers 6, the idler rollers 6 move towards the direction close to the circular ring 31 under the action of the control component 4. When the corrugated pipe moves to the middle of the three idler rollers 6, the idler rollers 6 move towards the direction close to the corrugated pipe. The displacement of the moving plate 32 can be controlled by the pressure sensor 321 on the moving plate 32, so that the outer peripheral surface of the idler roller 6 is engaged with the corrugated pipe, realizing the clamping and limiting of the corrugated pipe without causing damage to the corrugated pipe.

[0027] Refer to Figure 6 , a first motor 52 is fixed on the top of the circular ring 31. The bottom end of the output shaft of the first motor 52 is coaxially fixed with a telescopic sleeve 53. A support block 5 is fixed on the side surface of the top support plate 33. A telescopic rod 51 passes through the top surface of the support block 5, and the telescopic rod 51 is rotatably connected to the support block 5. A sliding block 511 is fixed on the outer peripheral surface of the telescopic rod 51. A sliding through groove 531 is formed on the outer peripheral surface of the telescopic sleeve 53. The sliding block 511 is in sliding fit with the telescopic sleeve 53 along the vertical direction through the sliding through groove 531. A first bevel gear 512 is coaxially fixed at the bottom end of the telescopic rod 51. A second bevel gear 61 is coaxially fixed at the end of the idler roller 6. The second bevel gear 61 is rotatably installed on the support plate 33. The first bevel gear 512 and the second bevel gear 61 are meshed with each other.

[0028] When the first motor 52 is started, the first motor 52 drives the telescopic sleeve 53 to rotate. The telescopic sleeve 53 drives the telescopic rod 51 to rotate through the sliding block 511 and the sliding through groove 531. The telescopic rod 51 drives the idler roller 6 to rotate through the first bevel gear 512 and the second bevel gear 61. The idler roller 6 can drive the corrugated pipe to rotate through friction.

[0029] Refer to Figure 2 and Figure 7, a heating box 7 and an air extraction pump 71 for delivering inert gas into the heating box 7 are installed on the top surface of the welding table 1, and an electric heating wire is arranged inside the heating box 7. An air outlet pipe 62 is arranged inside the idler roller 6, and the air outlet of the air outlet pipe 62 extends out of the idler roller 6 and is arranged towards the weld of the corrugated pipe. An air delivery assembly 8 for connecting the air extraction pump 71 and the air outlet pipe 62 is arranged on the welding table 1. The inert gas is delivered to the welds of the two corrugated pipes through the air outlet of the air outlet pipe 62, providing a stable welding environment for the corrugated pipe, thereby preventing the welding area from being oxidized.

[0030] Refer to Figure 7 and Figure 8 , the air delivery assembly 8 includes an annular pipe 81 fixed to the side surface of the circular ring 31, and a connecting square pipe 82 is connected to the outer peripheral surface of the annular pipe 81. A connecting circular pipe 83 is connected between the two connecting square pipes 82, and an air delivery pipe 84 is connected between the connecting circular pipe 83 and the heating box 7. The annular pipe 81 is arranged along the circumferential direction of the circular ring 31, and three first square pipes 85 are fixed to the inner peripheral surface of the annular pipe 81. A second square pipe 86 is slidably installed in the first square pipe 85 along the radial direction of the circular ring 31, and a connecting sleeve 87 is fixed to the side surface of the second square pipe 86 close to the idler roller 6. The first square pipe 85 is communicated with the connecting sleeve 87, the connecting sleeve 87 is located inside the idler roller 6, and the air outlet pipe 62 sequentially passes through the connecting sleeve 87 and the second square pipe 86. A plurality of first air delivery through grooves 871 are formed on the outer peripheral surface of the connecting sleeve 87, and the plurality of first air delivery through grooves 871 are arranged at equal intervals along the circumferential direction of the connecting sleeve 87. A plurality of second air delivery through grooves 621 are formed on the outer peripheral surface of the air outlet pipe 62, and the plurality of second air delivery through grooves 621 are arranged at equal intervals along the circumferential direction of the air outlet pipe 62, and the second air delivery through grooves 621 are located at one end of the air outlet pipe 62 far from the connecting sleeve 87.

[0031] The inert gas heated in the heating box 7 enters the connecting circular pipe 83 through the air delivery pipe 84, then enters the annular pipe 81 through the connecting square pipe 82. The inert gas in the annular pipe 81 enters the connecting sleeve 87 through the first square pipe 85 and the second square pipe 86, and then enters the idler roller 6 through the first air delivery through grooves 871. After the idler roller 6 is filled with the inert gas, it enters the air outlet pipe 62 through the second air delivery through grooves 621, realizing uniform heating of the outer surface of the idler roller 6. The outer surface of the idler roller 6 is attached to the corrugated pipe, and the idler roller 6 drives the corrugated pipe to rotate, thereby realizing uniform heating of the outer surface of the corrugated pipe.

[0032] The implementation principle of a welding device for the circumferential seam of a corrugated pipe in an embodiment of this application is as follows: The feeding assembly 2 is used to convey two corrugated pipes to the middle of the ring 31 respectively. The three idler rollers 6 clamp the corrugated pipes, so that the ends of the two corrugated pipes are closely attached. The air extraction pump 71 is used to convey inert gas into the heating box 7. The inert gas is heated under the action of the heating wire. The heated inert gas enters the air outlet pipe 62 through the gas conveying assembly 8 and is then conveyed to the weld of the two corrugated pipes, providing a stable welding environment for the corrugated pipe to prevent the welding area from being oxidized. At the same time, the temperature of the idler roller 6 rises under the action of the inert gas, and then preheats the part of the corrugated pipe near the weld, reducing the temperature difference between the welding area and the base material, reducing the concentration of thermal stress, and reducing the deformation of the corrugated pipe caused by local shrinkage.

[0033] A welding method for the circumferential seam of a corrugated pipe includes the following steps: S1. Start the second motor 28, and use the feeding assembly 2 to convey two corrugated pipes to the middle of the ring 31 respectively, so that the ends of the two corrugated pipes are closely attached; S2. Start the electric push rod 44, and use the control assembly 4 to move the three idler rollers 6 towards the direction close to the corrugated pipe and clamp the corrugated pipe; S3. Start the air extraction pump 71, convey inert gas into the heating box 7, the inert gas is heated under the action of the heating wire, and the heated inert gas enters the air outlet pipe 62 through the gas conveying assembly 8 and is then conveyed to the weld of the two corrugated pipes; S4. Start the welding system 11, and the welding head 111 welds the two corrugated pipes.

[0034] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A welding device for the annular seam of a bellows, characterized in that: The invention comprises a welding platform (1) and a welding system (11) arranged on the welding platform (1), wherein the welding system (11) comprises a welding head (111), two coaxially arranged circular rings (31) are fixed on the welding platform (1), the welding head (111) is located between the two circular rings (31), three rollers (6) for clamping a corrugated pipe are arranged inside the circular ring (31), and a roller for conveying the corrugated pipe to the three rollers (6) is arranged on the side of the circular ring (31) away from the welding head (111). A material conveying assembly (2) is provided between the rollers (6), an air outlet pipe (62) is inserted into the rollers (6), an air outlet of the air outlet pipe (62) extends out of the rollers (6) and is arranged toward the weld of the corrugated pipe, a heating box (7) and an air extraction pump (71) for conveying inert gas into the heating box (7) are arranged on the welding table (1), an electric heating wire is arranged in the heating box (7), and a gas conveying assembly (8) for connecting the air extraction pump (71) and the air outlet pipe (62) is arranged on the welding table (1).

2. A welding device for annular seams of corrugated pipes according to claim 1, characterized in that: The gas delivery assembly (8) comprises an annular tube (81) fixed to the side of the circular ring (31); the outer circumferential surface of the annular tube (81) is connected to a connecting square tube (82); a connecting circular tube (83) is connected between two connecting square tubes (82); a gas delivery pipe (84) is connected between the connecting circular tube (83) and the heating box (7); the annular tube (81) is arranged along the circumferential direction of the circular ring (31); three square tubes (85) are fixed to the inner circumferential surface of the annular tube (81); square tubes (86) are installed inside the square tubes (85) in a radially sliding manner along the circular ring (31); the square tubes (86) are close to the side of the roller (6). A connecting sleeve (87) is fixed thereto, the square tube (85) is connected to the connecting sleeve (87), the connecting sleeve (87) is located inside the roller (6), the air outlet pipe (62) passes through the connecting sleeve (87) and the square tube (86) in sequence, a plurality of first air delivery grooves (871) are provided on the outer circumference of the connecting sleeve (87), a plurality of second air delivery grooves (621) are provided on the outer circumference of the air outlet pipe (62), the plurality of second air delivery grooves (621) are arranged at equal intervals along the circumference of the air outlet pipe (62), and the second air delivery grooves (621) are located at one end of the air outlet pipe (62) away from the connecting sleeve (87).

3. A welding device for annular seams of corrugated pipes according to claim 2, characterized in that: The outer peripheral surface of the roller (6) is corrugated and can be engaged with the outer peripheral surface of the corrugated tube. Three movable plates (32) are arranged inside the circular ring (31). The circular ring (31) is provided with a control component (4) for controlling the radial movement of the movable plates (32) along the circular ring (31). A support plate (33) is fixed to the side of the movable plate (32) close to the roller (6). The end surface of the roller (6) away from the square tube (86) is rotatably connected to the support plate (33).

4. A welding device for annular seams of corrugated pipes according to claim 3, characterized in that: Two connecting rods (35) are fixed on the side of the movable plate (32) close to the circular ring (31); a connecting hole (34) for passing the connecting rod (35) is provided on the inner circumference of the circular ring (31); a control rod (36) is fixed between the two connecting rods (35); the control assembly (4) comprises a control circular plate (41) sleeved on the outer circumference of the circular ring (31); the control circular plate (41) is rotatably connected to the circular ring (31); an arc groove (42) is provided on the side of the control circular plate (41); the control rod (36) passes through the arc groove (42); the control rod (36) is slidably matched with the control circular plate (41) through the arc groove (42); and the distance between the end of the arc groove (42) away from the connecting hole (34) and the circular ring (31) gradually increases.

5. A welding device for annular seams of corrugated pipes according to claim 4, characterized in that: A synchronization rod (43) is fixed between the two control circular plates (41); an electric push rod (44) is hinged on the top surface of the welding table (1); a synchronization block (45) is fixed to the end of the piston rod of the electric push rod (44); the synchronization block (45) is sleeved on the outer periphery of the synchronization rod (43); and the synchronization block (45) is rotationally connected to the synchronization rod (43).

6. A welding device for annular seams of corrugated pipes according to claim 3, characterized in that: A motor 1 (52) is fixed on the top of the circular ring (31), a telescopic sleeve (53) is coaxially fixed to the bottom end of the output shaft of the motor 1 (52), a support block (5) is fixed to the side of the support plate (33) located at the top, a telescopic rod (51) is passed through the top surface of the support block (5), the telescopic rod (51) is rotatably connected to the support block (5), a bevel gear 1 (512) is coaxially fixed to the bottom end of the telescopic rod (51), a bevel gear 2 (61) is coaxially fixed to the end of the roller (6), the bevel gear 1 (512) and the bevel gear 2 (61) are meshed with each other, a sliding block (511) is fixed to the outer circumference of the telescopic rod (51), a sliding groove (531) is provided on the outer circumference of the telescopic sleeve (53), and the sliding block (511) is slidably matched with the telescopic sleeve (53) in the vertical direction through the sliding groove (531).

7. A welding device for annular seams of corrugated pipes according to claim 1, characterized in that: The feeding assembly (2) comprises a bearing platform (21) fixed to the top surface of the welding platform (1), the top surface of the bearing platform (21) is provided with a plurality of driving members (22), the driving members (22) comprising two vertically arranged fixed plates (221), a bearing roller (222) is rotatably mounted between the two fixed plates (221), a moving block (24) is mounted on the top of the fixed plate (221), a driving rod (223) is rotatably mounted between the two moving blocks (24), and a driving rod (223) is sleeved and fixed on the outer circumference of the driving rod (223). A driving tube (224), the outer circumferential surface of which is fixed with a plurality of driving plates (225), the plurality of driving plates (225) being arranged at equal intervals along the circumference of the driving tube (224), a pushing round rod (226) being fixed on the side of the driving plate (225) away from the driving tube (224), the pushing round rod (226) being capable of being inserted into the groove of the corrugated tube, a second motor (28) being fixed on the side of the fixing plate (221), the output end of the second motor (28) being coaxially fixedly connected with the driving rod (223).

8. A welding device for annular seams of corrugated pipes according to claim 7, characterized in that: A movable groove (23) is provided on the side of the fixed plate (221), and the movable block (24) is slidably matched with the fixed plate (221) in the vertical direction through the movable groove (23). Slide blocks (25) are fixed on both sides of the movable block (24), and slide grooves (26) are provided on the opposite inner sides of the movable grooves (23). The slide blocks (25) are slidably matched with the fixed plate (221) in the vertical direction through the slide grooves (26). A screw rod (27) is passed through the top surface of the fixed plate (221), and the screw rod (27) is threadedly connected to the fixed plate (221), and the bottom end of the screw rod (27) is rotatably connected to the top surface of the movable block (24).

9. A method for welding annular seams of a bellows, based on a welding device for annular seams of a bellows according to any one of claims 7 to 8, characterized in that: The steps include: S1, start the second motor (28), and use the feeding assembly (2) to convey the two bellows to the middle of the ring (31) respectively, so that the ends of the two bellows fit tightly together; S2, starting the electric push rod (44), using the control component (4) to move the three rollers (6) toward the direction close to the corrugated pipe and clamp the corrugated pipe; S3, starting the vacuum pump (71) to deliver the inert gas into the heating box (7), the inert gas is heated under the action of the electric heating wire, the heated inert gas enters the gas outlet pipe (62) through the gas delivery component (8), and is then delivered to the welding seam of the two bellows; S4, starting the welding system (11), and the welding head (111) welds the two bellows.

Images