Welding device special for two-way pipe

Abstract

The invention discloses a welding device special for a two-way pipe. A clamping and positioning module and a welding module are correspondingly arranged on the left side and the right side of a middle conveying table. A longitudinal movement driving plate is arranged on the clamping and positioning module, a clamping and fixing seat is arranged on the longitudinal movement driving plate, a positioning rotation shaft is arranged on the clamping and fixing seat, a driving piece is arranged on the positioning rotation shaft, an inner pipe fixing head is arranged at the front end of the positioning rotation shaft, and a plurality of elastic claws are hinged and fixed around the inner pipe fixing head; the driving piece extrudes the elastic claw to make the elastic claw perform clamping action, and concentric positioning of the inner pipe and the outer pipe is achieved through the structure; a longitudinal movement driving plate is arranged on the welding module, a welding rotation shaft and a forming driving cylinder are arranged on the longitudinal movement driving plate, an inner pipe positioning piece is arranged at the end of the welding rotation shaft, an extrusion forming die is further fixed to the welding rotation shaft in a sliding mode, and the extrusion forming die is connected with the forming driving cylinder to achieve axial driving; a welding gun is arranged below the extrusion forming die and used for burning the ends of the inner pipe and the outer pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of solar double-pipe welding equipment, and specifically relates to a special welding device for double-pipes. Background Technology

[0002] As is well known, in the existing field of solar energy technology, the solar double-tube heat collection system, as a new type of heat collection glass tube, has seen rapid development in the fields of solar heating and heat extraction in recent years.

[0003] This type of solar dual-channel tube is usually composed of an inner tube and an outer tube. During the manufacturing process of joining the inner and outer tubes, a tail tube that communicates with the outside is set in the cavity between the two for vacuuming. To facilitate connection with external vacuuming equipment, this tail tube should be set on the side wall of the outer tube.

[0004] In existing technologies, when the inner and outer tubes are joined at the ends, manual welding is performed by personnel using welding equipment. Typically, the outer tube with a tail tube is placed over the inner tube, and the two ends are joined using high-temperature combustion. The technical problems that need to be solved during this joining process are: 1. The concentricity of the inner and outer tubes cannot be maintained; during manual welding, the inner and outer tube supports cannot be accurately positioned; 2. Manual welding is inefficient and requires highly skilled welders. Products obtained through manual welding have a high defect rate and cannot meet actual usage requirements.

[0005] In view of the shortcomings of the existing technology, how can those skilled in the art improve the technology and design a special welding device for double-pipes, which is used to achieve welding of the ends of double-pipes and can effectively improve welding accuracy and welding efficiency, while also eliminating internal moisture. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the present invention proposes a special welding device for double-pipes. By setting up inner and outer pipe positioning devices, it can perform single-end step-by-step welding of inner and outer pipes, and realize automatic positioning, welding, end treatment and internal dehumidification, which can effectively improve welding efficiency and welding accuracy.

[0007] It should be noted that water vapor is generated during the welding process of this type of double-pipe. If this water vapor cannot be removed in time, it will accumulate inside the pipe layer and eventually form water mist or water droplets. This water mist or water droplets may cause the pipe to burst at high temperatures. This equipment innovatively proposes tailpipe air supply to completely remove water vapor.

[0008] The technical solution adopted by this invention to solve its technical problem is: A special welding device for double-pipes includes an intermediate conveying platform, wherein at least two rows of supporting guide wheels are provided in the intermediate conveying platform, and the supporting guide wheels are capable of lateral movement and rotation as a whole. The intermediate conveyor platform is equipped with clamping and positioning modules and welding modules on its left and right sides respectively. The clamping and positioning module is equipped with a longitudinal movement drive plate, a clamping fixing seat on the longitudinal movement drive plate, a positioning rotation shaft on the clamping fixing seat, a drive component on the positioning rotation shaft, an inner tube fixing head at the front end of the positioning rotation shaft, and several elastic claws hinged and fixed around the inner tube fixing head. The drive component compresses the elastic claws to perform a clamping action. A clamping drive cylinder and a clamping lever are provided in conjunction with the drive component. The drive component is tapered and includes a drive groove and a cone head. A swing seat is provided in conjunction with the drive component. A swing shaft is fixed on the swing seat by a sleeve. The swing shaft is connected to the clamping drive cylinder, and a clamping lever on the swing shaft cooperates with the drive groove to achieve shaft movement drive.

[0009] The aforementioned elastic claws are hinged and fixed on the annular seat. All the elastic claws are pulled together by elastic rings. One end of the elastic claw is provided with a sliding member, and the other end of the elastic claw is a gripping end. The driving member squeezes the sliding member to make the elastic claw swing on the annular seat and thus perform a clamping action.

[0010] A return spring is provided between the driving component and the clamping base. The return spring compresses the driving component to move in the direction of the elastic claw.

[0011] The welding module is equipped with a longitudinal drive plate, on which a welding fixing seat is mounted. The welding fixing seat houses a welding rotation shaft and a forming drive cylinder. An inner tube positioning component is located at the end of the welding rotation shaft, and an extrusion forming die is slidably fixed to the welding rotation shaft. The extrusion forming die is connected to the forming drive cylinder for axial drive. A welding torch is positioned below the extrusion forming die for scorching the ends of the inner and outer tubes. The welding torch is fixed to a transverse plate, which is equipped with a positioning baffle in conjunction with the welding torch. The transverse plate is connected to a transverse drive device, enabling the conversion between positioning and welding functions. A smoothing component is located around the extrusion forming die, and this smoothing component is connected to a smoothing drive device, allowing it to move around the forming tube to smooth the ends of the joined double-tube tubes.

[0012] Both the clamping and positioning module and the welding module are equipped with support guide wheel plates. The support guide wheel plates are equipped with several sets of support wheels. A vertical drive cylinder and a guide assembly are provided below the support guide wheel plates to control the vertical movement of the support guide wheel plates.

[0013] The intermediate conveyor platform is provided with two sets of clamping and positioning modules and two sets of welding modules on its left and right sides, namely a front clamping and positioning module and a rear clamping and positioning module, a front welding module and a rear welding module; the front clamping and positioning module and the front welding module are arranged correspondingly, and the rear clamping and positioning module and the rear welding module are arranged correspondingly.

[0014] The positioning rotation shaft on the front clamping and positioning module is axially hollow. A pneumatic slip ring assembly is provided at one end of the positioning rotation shaft, and an inner tube fixing head is fixed at the other end. An outer tube baffle is provided on the rear side of the inner tube fixing head. An air supply gap is provided between the inner tube fixing head and the outer tube baffle. The air supply gap is axially connected to the positioning rotation shaft.

[0015] Both the front welding module and the rear welding module are equipped with several annealing nozzles on their rear sides. The welding ends of the double-pass pipe are annealed through the annealing nozzles. This design allows the annealing process to be used in conjunction with the welding module, avoiding the need to perform external annealing again.

[0016] The positioning rotation shaft on the rear clamping and positioning module is designed with an air guide hole. One end of the positioning rotation shaft is equipped with a pneumatic slip ring, and the other end is fixed with an annular seat. The annular seat is equipped with a tail tube positioning plate, and an air supply port is provided in conjunction with the tail tube positioning plate. The air supply port is connected to the air pipe and supplies air into the tail tube when the tail tube is fixed.

[0017] The forming cavity of the extrusion molding die is arranged in a ring shape, including an assembly hole in the middle, and a forming groove is provided around the assembly hole. The forming groove is located at the junction of the inner tube and the outer tube.

[0018] The present invention has the following beneficial effects: The present invention includes an intermediate conveyor platform, which is provided with at least two rows of supporting guide wheels. The supporting guide wheels can move horizontally as a whole or rotate on their own axis. A clamping and positioning module and a welding module are respectively arranged on the left and right sides of the intermediate conveyor platform. A longitudinal movement drive plate is provided on the clamping and positioning module, and a clamping fixing seat is provided on the longitudinal movement drive plate. A positioning rotation shaft is provided on the clamping fixing seat, and a driving component is provided on the positioning rotation shaft. An inner tube fixing head is provided at the front end of the positioning rotation shaft. Several elastic claws are hinged and fixed around the inner tube fixing head. The driving component squeezes the elastic claws to make them perform a clamping action. The above structure sets the concentric positioning of the inner tube and the outer tube. A longitudinal movement drive plate is provided on the welding module, and a welding rotation shaft and a forming drive cylinder are provided on the longitudinal movement drive plate. An inner tube positioning component is provided at the end of the welding rotation shaft. An extrusion forming mold is also slidably fixed on the welding rotation shaft. The extrusion forming mold is connected to the forming drive cylinder to achieve axial drive. A welding gun is provided below the extrusion forming mold for burning the ends of the inner tube and the outer tube. The above structure enables welding of the inner and outer tube ends after positioning. This welding equipment also includes a smoothing component that moves around the periphery of the extrusion die to smooth the ends of the joined double tubes. During the welding process, high-pressure gas is used to remove moisture from both ends, preventing moisture accumulation.

[0019] This dual-pipe welding device features a novel structural design, enabling automated concentric positioning, end welding, and venting during the welding process. Its welding process is stable and efficient, overcoming issues of low welding precision and moisture, making it an ideal welding device for dual-pipes. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of the front welding module of the present invention; Figure 2 This is a three-dimensional structural diagram of the front clamping and positioning module of the present invention; Figure 3 This is a three-dimensional structural diagram of the rear clamping and positioning module of the present invention; Figure 4 This is a top view of the structure of the present invention; Figure 5 for Figure 1 Enlarged schematic diagram of the structure of region A in the middle; Figure 6 for Figure 2 Enlarged schematic diagram of the structure of region C in the middle; Figure 7 for Figure 1 Enlarged schematic diagram of the structure of region B in the middle; Figure 8 for Figure 2Enlarged schematic diagram of the structure of region D in the middle; Figure 9 for Figure 2 Enlarged schematic diagram of the structure of region E in the middle; Figure 10 for Figure 2 Enlarged schematic diagram of the structure of the middle F region; Figure 11 for Figure 3 Enlarged schematic diagram of the structure of the G region; Figure 12 Schematic diagram of the air supply structure for the rear clamping and positioning module; Figure 13 This is a schematic diagram of the cross-sectional structure of an extrusion molding die.

[0022] In the picture, Intermediate conveyor table, 11. Support guide wheel, 12. Transverse drive motor, 13. Rotation drive motor; 21. Left side frame, 22. Right side frame, 23. Front annealing nozzle, 24. Rear annealing nozzle; Front clamping and positioning module; 30. Clamping fixing seat; 31. Clamping drive cylinder; 311. Swing seat; 312. Swing shaft; 313. Clamping lever; 314. Drive pulley; 32. Positioning rotation shaft; 33. Return spring; 34. Drive component; 341. Drive groove; 342. Cone head; 35. Elastic claw; 351. Ring seat; 352. Gripping end; 353. Elastic ring; 354. Sliding component; 36. Inner tube fixing head; 361. Outer tube baffle; 362. Air supply gap; Front welding module, 40. Welding fixing seat, 41. Top rail, 410. Smoothing drive device, 411. Smoothing rod fixing seat, 412. Smoothing rod, 42. Forming drive cylinder, 421. Linkage plate, 43. Forming guide post, 44. Welding rotation shaft, 441. Guide sleeve, 45. Extrusion forming mold, 451. Forming groove, 452. Assembly hole, 46. Inner tube positioning component, 47. Transverse plate, 471. Transverse drive device, 472. Positioning baffle, 473. Welding gun; Rear welding module; Rear clamping and positioning module, 61, tailpipe support rod, 62, tailpipe positioning plate, 621, air nozzle, 622, air supply port, 623, conduit, 63, pneumatic slip ring assembly; 71. Supporting guide wheel plate; 72. Vertical drive cylinder; 73. Supporting wheel; 74. Vertical guide rod; 75. Guide plate. Longitudinal base, 81. Longitudinal guide rail, 82. Longitudinal drive plate, 83. Longitudinal drive cylinder, 84. Driven wheel, 85. Rotation drive motor, 851. Drive wheel; Double-ended pipe, 91, tailpipe. Detailed Implementation

[0023] The welding device disclosed in this invention has a novel structure, which significantly improves the accuracy and welding efficiency in the welding process of double pipes. To more clearly demonstrate the technical effects of this invention, the structure and working steps of this invention are described in detail below through specific embodiments.

[0024] Example 1: A special welding device for double-pipes, as shown in the attached document. Figure 1 , 2 As shown in Figure 3, it includes an intermediate conveyor platform 1, in which two rows of supporting guide wheels 11 are arranged in parallel. The supporting guide wheels 11 are all double-row wheels, which can drive the double-pass pipe to rotate in a ring and rotate on their own under the drive of the transverse drive motor 12 and the self-rotation drive motor 13. This structure or equivalent structure is disclosed in the patent documents of solar double-pass pipe side wall tail pipe welding device with publication number CN119681535A and solar glass collector tube high-efficiency tail device with publication number CN 117776511A. It will not be described in detail here.

[0025] This dual-pipe welding device has clamping and positioning modules and welding modules on the left and right sides of the intermediate conveyor table 1, respectively. Those skilled in the art can use the clamping and positioning modules and welding modules to weld both ends. This welding can be automated or semi-automatic. Semi-automatic operation refers to manual assistance in switching the two ends during the dual-pipe welding process.

[0026] To demonstrate the advantages of this device, this embodiment, through specific installation and testing, presents a relatively reasonable layout setting, as follows: The left and right side frames 2 and 21 are respectively set on the left and right sides of the middle conveyor platform 1. Two sets of clamping and positioning modules and two sets of welding modules are respectively set on the left and right side frames 2 and 21, namely the front clamping and positioning module 3 and the rear clamping and positioning module 6, the front welding module 4 and the rear welding module 5; the front clamping and positioning module 3 and the front welding module 4 are respectively set, and the rear clamping and positioning module 6 and the rear welding module 5 are respectively set.

[0027] The specific structure of the front clamping and positioning module 3 is as follows: Figure 5As shown, a longitudinal drive plate 82 is provided on the front clamping and positioning module 3, and a clamping fixing seat 30 is provided on the longitudinal drive plate 82. Two positioning rotation shafts 32 are provided through the clamping fixing seat 30. A driving component 34 is provided on the positioning rotation shaft 32. The driving component 34 is tapered and includes a driving groove 341 and a cone head 342. An inner tube fixing head 36 is provided at the front end of the positioning rotation shaft 32. Several elastic claws 35 are hinged and fixed around the inner tube fixing head 36. The driving component 34 compresses the elastic claws 35. This allows it to perform a clamping action; when the elastic claw 35 is fixed, several elastic claws 35 are hinged and fixed on the annular seat 351, and all the elastic claws 35 are pulled together by elastic rings 353. One end of the elastic claw 35 is provided with a sliding member 354, which can be a pulley or a ball. The other end of the elastic claw 35 is a gripping end 352, which is used to clamp with the outer tube of the double-through pipe 9. This device uses the driving member 34 to squeeze the sliding member 354, causing the elastic claw 35 to swing on the annular seat 351 and thus perform a clamping action.

[0028] In this dual-pipe welding device, the driving component 34 is configured with a swing seat 311 on the longitudinal drive plate 82. A swing shaft 312 is fixed to the swing seat 311 via a sleeve. The swing shaft 312 is connected to the clamping drive cylinder 31, and a U-shaped clamping lever 313 is provided on the swing shaft 312 to cooperate with the drive groove 641 to achieve shaft movement drive. To improve drive smoothness, a drive pulley 314 is also provided at the end of the clamping lever 313 to press against the drive groove 641.

[0029] Furthermore, during the clamping drive of the elastic claw 35, the axial forward and backward movement of the entire drive member 34 can be achieved by swinging the clamping lever 313. However, because the clamping lever 313 swings, it may not be fully engaged when it retracts. To avoid this problem, a return spring 33 is provided between the drive member 34 and the clamping fixing seat 30. The return spring 33 compresses the drive member 34 to move in the driving direction of the elastic claw 35. When the clamping lever 313 cannot swing, the return spring 33 can promote the axial movement of the drive member 34 to reset.

[0030] like Figure 6As shown, the positioning rotation shaft 32 on the front clamping and positioning module 3 is axially hollow. A pneumatic slip ring assembly 63 is installed at one end of the positioning rotation shaft 32, and an inner tube fixing head 36 is fixed at the other end. An outer tube baffle 361 is installed behind the inner tube fixing head 36. An air supply gap 362 is provided between the inner tube fixing head 36 and the outer tube baffle 361, and the air supply gap 362 is axially connected to the positioning rotation shaft 32. This structure is used when the inner and outer tubes are joined; while welding is being performed on one side of the front welding module 4, air is supplied to the front clamping and positioning module 3 through the air supply gap 362 to expel moisture between the inner and outer tubes.

[0031] During the welding of the double-pipe, the positioning rotation shaft 32 rotates, and its driving structure is as follows: Figure 6 As shown, a driven wheel 84 is provided on the rear side of the clamping and fixing base 30, and a rotation drive motor 85 is provided in conjunction with the driven wheel 84. A drive wheel 851 is provided on the rotation drive motor 85. The drive wheel 851 and the driven wheel 84 are connected to each other by a chain or belt to realize the rotation drive of the positioning and rotating shaft 32.

[0032] like Figure 7 , 8 As shown, a longitudinal drive plate 82 is provided on the front welding module 4, and a welding fixing seat 40 is provided on the longitudinal drive plate 82. Two welding rotation shafts 44 and a forming drive cylinder 42 are connected through the welding fixing seat 40. The welding rotation shafts 44 are fixed to the welding fixing seat 40 by guide sleeves 441. An inner tube positioning component 46 is provided at the end of the welding rotation shaft 44. An extrusion forming die 45 is also slidably fixed on the welding rotation shaft 44. The extrusion forming die 45 is connected to the forming drive cylinder 42 to achieve axial drive. A welding torch 473 is provided below the extrusion forming die 45 for burning the ends of the inner and outer tubes.

[0033] The welding torch 473 is fixed on the transverse plate 47. Positioning baffles 472 are also spaced on the transverse plate 47 to cooperate with the welding torch. The transverse plate 47 is connected to the transverse drive device 471 and enables the switching between positioning and welding functions. The transverse drive device 471 is a cylinder that pushes the transverse plate 47 to move horizontally, controlling the movement of the welding torch 473 or the positioning baffles 472 on the transverse plate 47 below the corresponding extrusion die 45, thereby achieving the switching between positioning and welding functions.

[0034] A smoothing component is provided around the extrusion molding die 45. In this embodiment, the smoothing component is placed on the top of the welding fixing base 40. A top track 41 and a smoothing rod fixing base 411 are provided on the top of the welding fixing base 40. Two smoothing rods 412 are welded at intervals on the smoothing rod fixing base 411 as smoothing components. A smoothing driving device 410 is provided in conjunction with the smoothing rod fixing base 411. The smoothing driving device 410 horizontally pushes the smoothing rod fixing base 411 to smooth the end of the double-through pipe 9 after it is joined. In this embodiment, the smoothing driving device 410 is a cylinder.

[0035] During the welding of the double-pipe system, the welding rotation shaft 44 rotates, and its driving structure is as follows: Figure 7 As shown, this structure is the same as the self-rotation drive structure of the positioning self-rotation shaft 32 on the front clamping and positioning module 3. On the rear side of the welding fixing seat 40, a driven wheel 84 is provided on the welding self-rotation shaft 44, and a self-rotation drive motor 85 is provided in conjunction with the driven wheel 84. A drive wheel 851 is provided on the self-rotation drive motor 85. The drive wheel 851 and the driven wheel 84 are connected to each other by a chain or belt to realize the self-rotation drive of the welding self-rotation shaft 44.

[0036] During the welding of the double-through pipe, the entire welding rotation shaft 44 rotates while also moving axially. To improve the stability of its axial movement, this special welding device for double-through pipes is equipped with a linkage plate 421 on the rear side of the extrusion molding die 45. The linkage rod is connected to the drive end of the forming drive cylinder 42. A forming guide post 43 is also fixed on the linkage plate 421. The forming guide post 43 passes through the welding fixing seat 40. When the end of the double-through pipe is shaped after welding, the stability of the movement of the extrusion molding die 45 can be improved by the forming guide post 43 on the rear side of the extrusion molding die 45.

[0037] Furthermore, the forming cavity of the extrusion molding die 45 is arranged in a ring shape, such as... Figure 13 As shown, it includes a central assembly hole 452, and a forming groove 451 is provided around the assembly hole 452. The forming groove 451 is located at the junction of the inner tube and the outer tube. When the double-through tube 9 rotates with the welding spindle 44 and the positioning spindle 32, the end can be shaped by the forming groove 451 in the extrusion forming mold, ensuring the standardization of the forming of the double-through tube 9 product.

[0038] like Figure 1 , 2As shown in Figures 3, 4, and 9, this special welding device for double-pipes is equipped with support guide plates 7 for both the clamping and positioning module and the welding module. As shown, the support guide plate 7 has several sets of support wheels 72. Below the support guide plate 7, a vertical drive cylinder 71 and a guide assembly control the vertical movement of the support guide plate 7. The guide assembly here consists of a guide plate 74 and a vertical guide rod 73 fixed to the bottom surface of the support guide plate 7. This structure enables end support during double-pipe welding. In the welding state, the double-pipe 9 rests on the support wheels 72, and after welding, it falls from the support wheels 72 onto the two rows of support guide wheels 11 on the intermediate conveyor table 1.

[0039] The rear welding module 5 in this dual-pipe welding device is the same as the front welding module 4. The rear clamping and positioning module 6 is based on the design of the front clamping and positioning module 3, but with further technical improvements. After the dual-pipe 9 is welded at one end with the cooperation of the front welding module 4 and the front clamping and positioning module 3, the exhaust of internal moisture must also be considered when welding the other end. Current technology cannot solve this problem and can only retain a portion of moisture inside the dual-pipe, which poses a risk to the subsequent use of the dual-pipe 9. Therefore, to improve the above... The problem is that the positioning rotation shaft 32 on the rear clamping and positioning module 6 is designed with an air guide hole. One end of the positioning rotation shaft 32 is provided with a pneumatic slip ring assembly 63, and the other end is fixed with an annular seat 651. The annular seat 351 is hollow and extends with an air pipe connector. Two tail tube support rods 61 are evenly distributed and fixed on the annular seat 351. A tail tube positioning plate 62 is provided on the tail tube support rod 61. An air supply port 622 and an air nozzle 621 are provided in conjunction with the tail tube positioning plate 62. The air supply port 622 is connected to the air pipe 623 through the air nozzle 621, and air is supplied to the tail tube 91 after the tail tube is fixed.

[0040] Furthermore, such as Figure 4 As shown, this technical solution has several annealing nozzles on the rear side of both the front welding module 4 and the rear welding module 5, namely the front annealing nozzle 22 and the rear annealing nozzle 23. The welding end of the double-pass pipe 9 is annealed by the action of the annealing nozzles set in the front and rear sections. This design can be used in conjunction with the welding module to avoid the need to perform external annealing again.

[0041] The front clamping and positioning module 3, the rear clamping and positioning module 6, the front welding module 4, and the rear welding module 5 are all fixed on the longitudinal movement drive plate 82. It must have the function of moving laterally toward the double-pass pipe. When working, it is close to the double-pass pipe, and when working, it is away from the double-pass pipe. The driving structure of the longitudinal movement drive plate 82 is as follows: a longitudinal base 8 is provided on the left side frame 2 and the right side frame 21. A longitudinal guide rail 81 is provided on the longitudinal base 8. A longitudinal movement drive plate 82 is provided on the longitudinal guide rail 81. A longitudinal movement drive cylinder 83 is provided in conjunction with the longitudinal movement drive plate 82. Under the drive of the longitudinal movement drive cylinder 83, the longitudinal movement of the longitudinal movement drive plate 82 is realized, thereby dragging the front clamping and positioning module 3, the rear clamping and positioning module 6, the front welding module 4, and the rear welding module 5 to move longitudinally.

[0042] Example 2: When using this special welding device for double-through pipes, first place both the outer and inner pipes on the support guide wheel 11. When it moves to the position of the front clamping and positioning module 3 and the front welding module 4, the support guide wheel plate 7 lifts the support wheel 72 up, lifting the unwelded double-through pipe to the corresponding position.

[0043] Driven by the longitudinal movement drive cylinder 83, the front clamping and positioning module 3 moves towards the double-through pipe. After reaching the position, the clamping fixing seat 30 stops moving forward. The clamping drive cylinder 31 drives the clamping lever 313 on the swing shaft 312 to cooperate with the drive groove 641 to realize the shaft movement drive. The drive component 34 squeezes the elastic claw 35 to make it perform a clamping action to clamp the outer tube of the double-through pipe 9. The inner tube fixing head 36 simultaneously fixes the inner tube. The transverse plate 47 in the front welding module 4 area is equipped with a welding gun 473 and a positioning baffle 472. The positioning baffle 472 first positions the end of the double-through pipe. The positioning and welding functions are switched, and then welding is performed by the welding gun 473.

[0044] On the front welding module 4, an inner tube positioning component 46 is provided at the end of the welding rotation shaft 44 for positioning the inner tube. During the welding process, the end face is formed by axial movement of the extrusion forming die 45. After forming, the top smoothing drive device 410 horizontally pushes the smoothing rod 412 to smooth the end of the double-through pipe 9 after it is joined. During the above welding process, air is supplied through the air supply gap 362 on the side of the front clamping positioning module 3 to discharge the water vapor between the inner and outer pipes.

[0045] After welding, annealing is performed using the front annealing nozzle 22. Then, the other end of the double-pipe is welded in the area of ​​the rear clamping and positioning module 6 and the rear welding module 5. During the rear welding process, the welding and clamping principles are the same as the front section, except that a tailpipe positioning plate 62 is installed on the tailpipe support rod 61 on the rear clamping and positioning module 6. The tailpipe positioning plate 62 is equipped with an air supply port 622 and an air nozzle 621, which supplies air to the tailpipe 91 after the tailpipe is fixed. This completely removes moisture from the double-pipe. After welding, the other end of the double-pipe is annealed using the rear annealing nozzle.

[0046] In summary, the present invention has a novel structural design, which can realize the clamping and positioning of the inner and outer tubes of the double-through pipe, single-end welding with moisture removal during welding, annealing, welding of the other end with moisture removal through exhaust gas, and annealing. The whole process is automated and can complete precise positioning and welding. It is highly efficient and accurate, and overcomes many drawbacks of the prior art. It is an ideal welding device for double-through pipes.

Claims

1. A special welding device for double-pipe pipes, characterized in that: It includes an intermediate conveyor platform, which is provided with at least two rows of supporting guide wheels, which are capable of lateral movement and rotation as a whole; The intermediate conveyor platform is equipped with clamping and positioning modules and welding modules on its left and right sides respectively. The clamping and positioning module is equipped with a longitudinal movement drive plate, a clamping fixing seat on the longitudinal movement drive plate, a positioning rotation shaft on the clamping fixing seat, a driving component on the positioning rotation shaft, an inner tube fixing head at the front end of the positioning rotation shaft, and several elastic claws hinged and fixed around the inner tube fixing head. The driving component compresses the elastic claws to make them perform a clamping action; a clamping drive cylinder and a clamping lever are provided in conjunction with the driving component. The welding module is equipped with a longitudinal drive plate, on which a welding fixing seat is mounted. The welding fixing seat is equipped with a welding rotation shaft and a forming drive cylinder. An inner tube positioning component is mounted at the end of the welding rotation shaft, and an extrusion forming mold is slidably fixed on the welding rotation shaft. The extrusion forming mold is connected to the forming drive cylinder to achieve axial drive. A welding torch is mounted below the extrusion forming mold for burning the ends of the inner and outer tubes. The welding torch is fixed on a transverse plate, and a positioning baffle is mounted on the transverse plate in conjunction with the welding torch. The transverse plate is connected to a transverse drive device.

2. The special welding device for double-pipe as described in claim 1, characterized in that: The drive component is tapered and includes a drive groove and a cone head. A swing seat is provided in conjunction with the drive component. A swing shaft is fixed on the swing seat by a sleeve. The swing shaft is connected to a clamping drive cylinder and a clamping lever is provided on the swing shaft to cooperate with the drive groove to realize shaft movement drive.

3. The special welding device for double-pipe as described in claim 1, characterized in that: The aforementioned elastic claws are hinged and fixed on the annular seat. All the elastic claws are pulled together by elastic rings. One end of the elastic claw is provided with a sliding member, and the other end of the elastic claw is a gripping end. The driving member squeezes the sliding member to make the elastic claw swing on the annular seat and thus perform a clamping action.

4. The special welding device for double-pipe as described in claim 1, characterized in that: A return spring is provided between the driving component and the clamping base. The return spring compresses the driving component to move in the direction of the elastic claw.

5. The special welding device for double-pipe as described in claim 1, characterized in that: The extrusion molding die is provided with a smoothing component around its periphery. The smoothing component is connected to the smoothing drive device and moves around the periphery of the molding tube to smooth the ends of the combined double tubes.

6. The special welding device for double-pipe as described in claim 1, characterized in that: Both the clamping and positioning module and the welding module are equipped with support guide wheel plates. The support guide wheel plates are equipped with several sets of support wheels. A vertical drive cylinder and a guide assembly are provided below the support guide wheel plates to control the vertical movement of the support guide wheel plates.

7. The special welding device for double-pipe as described in claim 1, characterized in that: The intermediate conveyor platform is provided with two sets of clamping and positioning modules and two sets of welding modules on its left and right sides, namely a front clamping and positioning module and a rear clamping and positioning module, a front welding module and a rear welding module; the front clamping and positioning module and the front welding module are arranged correspondingly, and the rear clamping and positioning module and the rear welding module are arranged correspondingly.

8. The special welding device for double-pipe as described in claim 7, characterized in that: The positioning rotation shaft on the front clamping and positioning module is axially hollow. A pneumatic slip ring assembly is provided at one end of the positioning rotation shaft, and an inner tube fixing head is fixed at the other end. An outer tube baffle is provided on the rear side of the inner tube fixing head. An air supply gap is provided between the inner tube fixing head and the outer tube baffle. The air supply gap is axially connected to the positioning rotation shaft.

9. The special welding device for double-pipe as described in claim 7, characterized in that: Both the front welding module and the rear welding module are equipped with several annealing nozzles on their rear sides.

10. The special welding device for double-pipe as described in claim 7, characterized in that: The positioning rotation shaft on the rear clamping and positioning module is designed with an air guide hole. One end of the positioning rotation shaft is equipped with a pneumatic slip ring, and the other end is fixed with an annular seat. The annular seat is equipped with a tail tube positioning plate, and an air supply port is provided in conjunction with the tail tube positioning plate. The air supply port is connected to the air pipe and supplies air into the tail tube when the tail tube is fixed.

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