An automatic welding apparatus for heating pipe joints

Abstract

The application is suitable for the technical field of pipeline welding, and provides an automatic welding equipment for heating pipe joints, which comprises a chassis, a supporting unit and an executing unit. The chassis is symmetrically provided with cantilever cranes at both ends of the top thereof; the supporting unit is installed on the chassis and is provided with a lifting mechanism and a driving mechanism; a steam heating pipe is rotatably supported on the driving mechanism; and the executing unit is provided with a displacement mechanism and a double-sided limiting mechanism. The displacement mechanism drives the double-sided limiting mechanism to displace between a welding station and an initial station. When at the initial station, the double-sided limiting mechanism leaves an interference-free channel for hoisting the steam heating pipe; when at the welding station, the double-sided limiting mechanism abuts against and limits the flanges from both sides, and positions the welding joint at the welding gap. The application realizes simultaneous welding of the flanges at both ends of the steel pipe, solves the hoisting interference problem, and real-time restricts the butt joint gap during the whole welding process, thereby improving the welding quality and efficiency.

Description

Technical Field

[0001] This invention relates to the field of pipe welding technology, and more specifically, to an automatic welding device for heating pipe joints. Background Technology

[0002] The compression heat regeneration dryer is a high-efficiency drying equipment that uses high-temperature gas generated by a compressor to regenerate the adsorbent. It is widely used in compressed air systems, petrochemicals, power and other industries.

[0003] In this type of equipment, the steam heating pipe is one of the core components for heat exchange. It is usually composed of multiple sections of steel pipe and flanges at both ends, and operates in a harsh environment with high temperature, high pressure and cyclic alternating loads. The welding quality of the flanges at both ends of the heating pipe directly determines the sealing reliability and service life of the dryer.

[0004] Currently, the welding of steam heating pipes to flanges mainly employs manual argon arc welding or semi-automatic gas shielded welding. Due to the limited feeding method of the steel pipes, most steel pipes on the production line are fed from one end, meaning that flange welding can only be completed at one end first. After that end is welded, the pipes are re-clamped or reversed to weld the other end. This method of feeding from one end and welding in stages results in low work efficiency and makes it difficult to guarantee the consistency of welding quality at both ends.

[0005] To improve efficiency, the natural choice is to weld simultaneously from both ends. However, if welding devices are installed at both ends, it will cause structural interference during the process of lifting the steel pipe to the work station by crane, making it impossible to smoothly lower or remove the pipe. In addition, even if the lifting interference problem is overcome, two technical challenges will arise during simultaneous welding from both ends: First, differences in the weld position, heat dissipation conditions, and welding start points at both ends can easily cause asymmetry in heat input at both ends, leading to deviations in the gap and relative position between the flange and the steel pipe; second, the annular butt gap between the flange and the steel pipe will dynamically change during the welding process due to thermal expansion, gravity, and welding stress. This gap is difficult to constrain in real time throughout the entire welding process. If the gap is too small, the weld penetration will be insufficient; if the gap is too large, defects such as undercut, incomplete fusion, or root depression will occur.

[0006] Therefore, an automatic welding device for heating pipe joints is proposed to improve the existing problems. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an automatic welding device for heating pipe joints.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an automatic welding equipment for heating pipe joints, comprising a base frame with cantilever cranes symmetrically slidably mounted at both ends of its top; The support unit, mounted on the base frame, has a lifting mechanism and a driving mechanism. A steam heating pipe is also placed between the driving mechanisms, and the steam heating pipe forms rolling contact with the rollers in the two sets of driving mechanisms with its outer circumferential surface, and is rotatably supported on the two sets of driving mechanisms. The system includes an execution unit located on one side of the cantilever crane, which has a displacement mechanism and a double-sided limiting mechanism. The displacement mechanism is used to drive the double-sided limiting mechanism to move between the welding station and the initial station. During the welding process, the displacement mechanism drives the double-sided limiting mechanism to the double-sided weld of the flange and the steam heating pipe, and causes the double-sided limiting mechanism to abut and limit the flange and the steam heating pipe on both sides respectively.

[0009] The invention is further configured such that: slide rails are symmetrically arranged at both ends of the top of the base frame, and electric sliders slide on the slide rails, with the top of the electric sliders connected to the bottom of the corresponding cantilever crane.

[0010] The present invention is further configured such that: the lifting mechanism includes a lifting cylinder and a lifting platform driven by the lifting cylinder; the driving mechanism includes a driving motor and a driving roller driven by the driving motor; the driving motor is installed in the lifting platform, and the top of the lifting platform is also rotatably connected to an auxiliary roller distributed opposite to the driving roller, and the steam heating pipe is distributed between the driving roller and the auxiliary roller.

[0011] The present invention is further configured such that: the displacement mechanism includes a displacement cylinder, a connecting plate disposed at the telescopic end of the displacement cylinder, a rack disposed at one end of the connecting plate, and a cross-shaped component disposed at the end of the connecting plate away from the rack; the telescopic end of the displacement cylinder passes through the side wall of the cantilever crane and is connected to the connecting plate.

[0012] The invention is further configured such that: a crossbeam is provided at the top of the cantilever crane, a guide rod seat is provided below the crossbeam, a guide block is slidably provided on the guide rod seat, and the bottom of the guide block is connected to the side wall of the rack.

[0013] The present invention is further configured such that: the double-sided limiting mechanism includes a gear, a support frame disposed on the outside of the gear, a support rod disposed at one end of the support frame, a first abutting member disposed at the end of the support rod away from the support frame, and a first welding head disposed below the first abutting member; the gear is located below the cross frame and is rotatably connected to the two side walls of the cross frame, and the gear meshes with the rack for transmission.

[0014] The present invention is further configured such that: the first abutting member includes a threaded rod, a bullseye bearing assembly disposed at one end of the threaded rod, and a nut threaded onto the threaded rod; the threaded rod threaded through the side wall of the support rod and is distributed at an angle.

[0015] The present invention is further configured such that: a second abutment is symmetrically provided at both ends of the cross, the second abutment having the same structural shape as the first abutment; and a second welding head is provided between the second abutment.

[0016] In summary, this application includes at least one of the following beneficial technical effects: (1) The double-sided limiting mechanism is driven by the displacement mechanism to move between the welding station and the initial station. At the initial station, it makes way for the hoisting of the steam heating pipe without interference. At the welding station, the double-sided limiting mechanism is driven to the double-sided weld of the flange and the steam heating pipe, and the double-sided limiting mechanism abuts and limits the flange and the steam heating pipe on both sides respectively. This realizes the simultaneous welding of the flanges at both ends of the steel pipe, solves the hoisting interference problem, and constrains the connection gap between the flange and the steam heating pipe in real time throughout the welding process, thereby improving the welding quality and production efficiency.

[0017] (2) By reciprocating the structure between the welding station and the initial station, the execution unit is moved back to the side of the cantilever crane at the initial station, providing a non-interference longitudinal channel for the steam heating pipe to be hoisted to the support unit by the crane. This achieves the process goal of welding both ends at the same time, and avoids the physical obstruction of the welding device to the workpiece loading and unloading, thus taking into account both efficiency and ease of operation.

[0018] (3) By applying axial pre-tightening forces in opposite directions from both sides of the flange through the first abutting member and the second abutting member, the flange is rigidly constrained to the preset position at the end of the steel pipe, so that the annular butt gap remains stable throughout the welding process. Attached Figure Description

[0019] Figure 1 This is a plan view of the automatic welding equipment for the heating tube joint of the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the automatic welding equipment for the heating tube joint of the present invention.

[0021] Figure 3 This is a schematic diagram of the overall structure of the support unit in this invention.

[0022] Figure 4 This is a plan view of the execution unit in this invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Base frame; 11. Cantilever crane; 12. Slide rail; 13. Electric slider; 14. Cross frame; 15. Guide rod seat; 16. Guide block; 2. Support unit; 21. Lifting mechanism; 211. Lifting cylinder; 212. Lifting platform; 22. Drive mechanism; 221. Drive motor; 222. Drive roller; 223. Auxiliary roller; 3. Steam heating element; 4. Execution unit; 41. Displacement mechanism; 411. Displacement cylinder; 412. Connecting plate; 413. Rack; 414. Cross; 42. Double-sided limiting mechanism; 421. Gear; 422. Support frame; 423. Support rod; 424. First abutment member; 4241. Threaded rod; 4242. Bullseye bearing assembly; 4243. Nut; 425. First welding head; 426. Second abutment member; 427. Second welding head. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] Please see Figures 1-4 The present invention provides the following technical solutions: Example 1, see Figures 1-4 An automatic welding device for heating pipe joints includes a base frame 1, with cantilever cranes 11 symmetrically slidably mounted at both ends of its top. The support unit 2 is mounted on the base frame 1 and has a lifting mechanism 21 and a drive mechanism 22. A steam heating pipe 3 is also placed between the drive mechanisms 22, and the steam heating pipe 3 forms rolling contact with the rollers in the two sets of drive mechanisms 22 with its outer circumferential surface, and is rotatably supported on the two sets of drive mechanisms 22. And the execution unit 4, which is located on one side of the cantilever crane 11, has a displacement mechanism 41 and a double-sided limiting mechanism 42. The displacement mechanism 41 is used to drive the double-sided limiting mechanism 42 to move between the welding station and the initial station. During the welding process, the displacement mechanism 41 drives the double-sided limiting mechanism 42 to the double-sided weld of the flange and the steam heating pipe 3, and causes the double-sided limiting mechanism 42 to abut and limit the flange and the steam heating pipe 3 on both sides respectively.

[0026] Among them, the cantilever crane 11 can slide horizontally along the length of the base frame 1 to accommodate steam heating pipes 3 of different lengths, and after welding is completed, it can retreat to both ends to provide an unobstructed passage for the lifting and removal of the workpiece.

[0027] Support unit 2, mounted on base frame 1, includes a lifting mechanism 21 and a drive mechanism 22. The lifting mechanism 21 adjusts the support height of the steam heating pipe 3, ensuring its axis is on the same working plane as the welding head of the execution unit 4. The steam heating pipe 3 is placed between the drive mechanisms 22, and its outer circumference makes rolling contact with rollers in both drive mechanisms 22, allowing it to be rotatably supported on the two drive mechanisms 22. This support method enables the steam heating pipe 3 to rotate at a uniform speed during welding, thus achieving continuous welding of the annular weld gap and avoiding weld defects caused by uneven rotation in manual welding.

[0028] The execution unit 4, located on one side of the cantilever crane 11, has a displacement mechanism 41 and a double-sided limiting mechanism 42. The displacement mechanism 41 drives the double-sided limiting mechanism 42 to move between the welding station and the initial station. In the initial station, the execution unit 4 is retracted to one side of the cantilever crane 11, providing an interference-free longitudinal channel for the steam heating pipe 3 to be hoisted to the support unit 2 by the crane, thereby solving the problem in the background art that "the presence of welding devices at both ends will cause structural interference to the crane hoisting."

[0029] During the welding process, the displacement mechanism 41 drives the double-sided limiting mechanism 42 to the double-sided weld seam of the flange and the steam heating pipe 3, causing the double-sided limiting mechanism 42 to abut and limit the flange on both sides. Specifically, the double-sided limiting mechanism 42 applies axial abutting forces in opposite directions from one side and the other side of the flange simultaneously, rigidly constraining the flange to a preset position at the end of the steam heating pipe 3. This maintains the stability of the annular butt gap between the flange and the steel pipe throughout the welding process, effectively solving the two problems in the background technology: "asymmetrical heat input at both ends leading to gap and position deviation" and "difficulty in real-time constraint of the gap during welding."

[0030] See Figures 1-4 Furthermore, slide rails 12 are symmetrically arranged at both ends of the top of the base frame 1, and electric sliders 13 slide on the slide rails 12. The top of the electric sliders 13 is connected to the bottom of the corresponding cantilever crane 11.

[0031] When the electric slider 13 is activated, it can move the cantilever crane 11 closer to or away from the weld between the flange and the steam heating pipe 3.

[0032] See Figures 1-4 Furthermore, the lifting mechanism 21 includes a lifting cylinder 211 and a lifting platform 212 driven by the lifting cylinder 211; the driving mechanism 22 includes a driving motor 221 and a driving roller 222 driven by the driving motor 221. The drive motor 221 is installed in the lifting platform 212. The top of the lifting platform 212 is also rotatably connected to the auxiliary rollers 223 that are distributed opposite to the drive rollers 222. The steam heating pipes 3 are distributed between the drive rollers 222 and the auxiliary rollers 223.

[0033] The displacement mechanism 41 includes a displacement cylinder 411, a connecting plate 412 disposed at the telescopic end of the displacement cylinder 411, a rack 413 disposed at one end of the connecting plate 412, and a cross 414 disposed at the end of the connecting plate 412 away from the rack 413. The telescopic end of the displacement cylinder 411 passes through the side wall of the cantilever crane 11 and is connected to the connecting plate 412.

[0034] The lifting cylinder 211 is activated, pushing the lifting platform 212 to rise; the drive motor 221 is activated, driving the roller 222 to rotate via a belt, thereby causing the steam heating pipe 3 to rotate during welding, and the auxiliary roller 223 will also rotate due to the friction force of the steam heating pipe 3.

[0035] By having the driving roller 222 and auxiliary roller 223 jointly support and drive the steam heating pipe 3 to rotate at a uniform speed, the first welding head 425 and the second welding head 427 can be continuously welded along the annular weld gap, avoiding the problems of discontinuous weld beads or inconsistent penetration depth caused by uneven rotation during manual welding. The rotary welding method ensures that the heat input is evenly distributed circumferentially, reducing welding deformation caused by local overheating or excessively rapid cooling, thereby further suppressing the dynamic fluctuation of the annular butt gap during welding and improving the occurrence of defects such as insufficient penetration or undercut.

[0036] See Figures 1-4 Furthermore, a crossbeam 14 is provided at the top of the cantilever crane 11, and a guide rod seat 15 is provided below the crossbeam 14. A guide block 16 is slidably provided on the guide rod seat 15, and the bottom of the guide block 16 is connected to the side wall of the rack 413.

[0037] During the displacement of the rack 413, the guide block 16 slides directionally on the guide rod seat 15. The sliding engagement between the guide block 16 and the guide rod seat 15 provides precise linear motion constraint for the rack 413, ensuring that the rack 413 and the gear 421 maintain a stable meshing state and avoiding transmission gaps or jamming caused by rack wobble or vibration. Stable transmission allows the first abutment 424 to accurately and repeatedly reach the preset limit position, ensuring the consistency of the initial gap between the flange and the steel pipe in mass production. It also reduces secondary adjustment operations caused by positioning deviations, improving the automation level of the equipment and the stability of welding quality.

[0038] See Figures 1-4Furthermore, the double-sided limiting mechanism 42 includes a gear 421, a support frame 422 disposed outside the gear 421, a support rod 423 disposed at one end of the support frame 422, a first abutting member 424 disposed at the end of the support rod 423 away from the support frame 422, and a first welding head 425 disposed below the first abutting member 424; the gear 421 is located below the cross frame 14 and is rotatably connected to the two side walls of the cross frame 14, and the gear 421 meshes with the rack 413 for transmission.

[0039] When the displacement cylinder 411 is activated, it pushes the connecting plate 412 to move. On the one hand, the rack 413 moves and drives the gear 421 to rotate, thereby driving the support frame 422 and the support rod 423 to rotate synchronously, so that the first abutting part 424 abuts and limits one side wall of the flange. At the same time, the first welding head 425 is also located at the weld gap between the flange and the steam heating pipe 3 at one end. On the other hand, the cross 414 drives the two second abutting parts 426 to abut and limit the other side wall of the flange. At the same time, the second welding head 427 is also located at the weld gap between the flange and the steam heating pipe 3 at the other end.

[0040] By simultaneously driving the rack 413 and cross 414 with the same displacement cylinder 411, the first abutting member 424 and the second abutting member 426 achieve synchronous bidirectional abutting and limiting of both sides of the flange. This linkage mechanism ensures that the flange is rigidly constrained to both ends of the steel pipe throughout the welding process, effectively avoiding the problem of asymmetrical heat input caused by differences in the weld position, heat dissipation conditions, and welding start point at both ends. This prevents the flange from lateral displacement or tilting relative to the steel pipe axis, ensuring the consistency of the gap at both ends during the welding process. At the same time, since the first welding head 425 and the second welding head 427 arrive at the weld gap position synchronously with the limiting mechanism, the positioning and welding actions are integrated and coordinated, reducing auxiliary alignment time and further improving welding efficiency.

[0041] See Figures 1-4 Furthermore, the first abutting member 424 includes a threaded rod 4241, a bullseye bearing assembly 4242 disposed at one end of the threaded rod 4241, and a nut 4243 threadedly sleeved on the threaded rod 4241; the threaded rod 4241 is threaded through the side wall of the support rod 423 and is distributed obliquely.

[0042] The threaded engagement structure between the threaded rod 4241 and the nut 4243 allows for stepless adjustment of the distance between the bullseye bearing assembly 4242 and the flange sidewall, based on the thickness of different flange specifications. This enhances the equipment's compatibility with various types of steam heating pipes. The bullseye bearing assembly 4242, with its multi-point rolling contact, abuts against the flange sidewall. This provides sufficient axial limiting force to constrain flange displacement caused by thermal expansion or welding stress during welding, while also allowing the flange to rotate with the steel pipe. This avoids scratches or wear on the flange surface caused by rigid sliding friction, thus protecting the workpiece surface quality while ensuring reliable limiting.

[0043] See Figures 1-4 Furthermore, the two ends of the cross 414 are symmetrically provided with second abutment members 426, the second abutment members 426 and the first abutment member 424 have the same structural shape; a second welding head 427 is also provided between the second abutment members 426.

[0044] The two second abutment members 426 symmetrically arranged at both ends of the cross 414, together with the first abutment member 424, constitute a double-sided, multi-point limiting system for the flange. This symmetrical layout ensures that the axial abutment force borne by the flange during welding is evenly distributed, avoiding flange deflection or tilting that may be caused by unilateral abutment, thus ensuring the perpendicularity of the flange end face to the steel pipe axis. Simultaneously, the second welding head 427 is located between the two second abutment members 426, ensuring that the welding heat source is always within the enclosure of the limiting points. Even if minor thermal deformation occurs during welding, the abutment members can constrain the gap change in real time, effectively solving the technical problem of "difficulty in real-time constraint of the gap between the flange and the steel pipe during welding" in the background art, and significantly reducing the incidence of welding defects such as undercut, lack of fusion, and root depression.

[0045] In summary, the working principle of this invention is as follows: After the steam heating pipe 3 is spot-welded to the flange, the workers use a crane to lift the steam heating pipe 3 and the flange together to the top of the support unit 2. At this time, the execution unit 4 is in the initial position, that is, the displacement cylinder 411 is in the retracted state, and the double-sided limiting mechanism 42 is moved to the side of the cantilever crane 11, thus making room for the lifting of the steam heating pipe 3 without interference. This ensures that the steel pipe can be smoothly lowered onto the support unit 2 or removed from the equipment after welding, effectively solving the problem in the background technology that "the installation of welding devices at both ends will cause structural interference to the crane lifting".

[0046] After the steam heating pipe 3 is placed between the drive roller 222 and the auxiliary roller 223 of the support unit 2, the lifting cylinder 211 is activated, pushing the lifting platform 212 to rise to the preset welding height, so that the central axis of the steam heating pipe 3 and the flange is on the same working plane as the first welding head 425 and the second welding head 427 of the two execution units 4.

[0047] When welding begins, the displacement cylinder 411 is activated, and its telescopic end extends and pushes the connecting plate 412 to move horizontally in the direction of the steam heating pipe 3.

[0048] On one hand, the connecting plate 412 drives the rack 413 to move synchronously. The rack 413, through meshing with the gear 421, converts linear motion into rotational motion, driving the gear 421 to rotate the support frame 422 and the support rod 423 downwards around the gear axis until the first abutment 424 at the end of the support rod 423 abuts against and is limited by the flange from one side wall. At the same time, the first weld head 425, fixedly installed on the support rod 423, is precisely positioned at the annular weld gap between the flange and one end of the steam heating pipe 3.

[0049] On the other hand, the connecting plate 412 drives the cross 414 to move linearly towards the steam heating pipe 3. The two second abutment pieces 426, symmetrically arranged at both ends of the cross 414, abut against and limit the flange from the other side wall of the flange, forming a bidirectional, multi-point clamping of the flange with the first abutment piece 424. At the same time, the second welding head 427, located between the two second abutment pieces 426, is precisely positioned at the annular weld gap between the flange and the other end of the steam heating pipe 3.

[0050] Through the aforementioned linkage mechanism, a single drive action of the same displacement cylinder 411 achieves simultaneous positioning and bidirectional limiting of the flanges at both ends of the steel pipe, as well as synchronous delivery of the welding torches at both ends. The first abutment member 424 and the second abutment member 426 apply axial pre-tightening forces in opposite directions from both sides of the flange, rigidly constraining the flange to the preset position at the end of the steel pipe. This ensures that the annular butt gap between the flange and the steel pipe remains stable throughout the welding process, effectively solving the two technical problems in the background technology: "asymmetrical heat input at both ends leading to gap and position deviation" and "difficulty in real-time constraint of the gap during welding."

[0051] During welding, the drive motor 221 starts, driving the drive roller 222 to rotate via a belt. The drive roller 222, relying on friction, drives the steam heating pipe 3 to rotate uniformly around its own axis, with the auxiliary roller 223 rotating accordingly. The uniform rotation of the steam heating pipe 3 allows the first welding head 425 and the second welding head 427 to be welded continuously and evenly along the annular weld gap. The heat input is evenly distributed circumferentially, avoiding welding deformation caused by local overheating or excessively rapid cooling, and further suppressing the dynamic fluctuation of the annular butt gap. At the same time, the bullseye bearing assembly 4242 maintains contact with the flange sidewall through its multi-point rolling contact, providing continuous axial limiting force to constrain flange displacement caused by welding thermal expansion and welding stress, while allowing the flange to rotate smoothly with the steel pipe, avoiding scratches on the flange surface caused by rigid sliding friction.

[0052] After welding is completed, the displacement cylinder 411 retracts, causing the rack 413 to move in the opposite direction and the gear 421 to reverse. The first abutment 424 and the first welding head 425 are lifted upwards and reset. At the same time, the cross 414 drives the second abutment 426 and the second welding head 427 to move backwards out of the welding position. The execution unit 4 returns to its initial position as a whole, once again making way for the hoisting and removal of the steam heating pipe 3 without interference, thus completing a complete welding work cycle.

[0053] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. An automatic welding device for heating pipe joints, characterized in that: include, The base frame (1) has cantilever cranes (11) symmetrically slidably installed at both ends of its top. The support unit (2) is installed on the base frame (1) and has a lifting mechanism (21) and a driving mechanism (22). A steam heating pipe (3) is also placed between the driving mechanisms (22), and the steam heating pipe (3) forms rolling contact with the rollers in the two sets of driving mechanisms (22) with its outer circumference, and is rotatably supported on the two sets of driving mechanisms (22). And an execution unit (4), which is located on one side of the cantilever crane (11), has a displacement mechanism (41) and a double-sided limiting mechanism (42). The displacement mechanism (41) is used to drive the double-sided limiting mechanism (42) to move between the welding station and the initial station. During the welding process, the displacement mechanism (41) drives the double-sided limiting mechanism (42) to the double-sided weld of the flange and the steam heating pipe (3), and causes the double-sided limiting mechanism (42) to abut and limit the flange and the steam heating pipe (3) on both sides respectively.

2. The automatic welding equipment for heating pipe joints according to claim 1, characterized in that: The top two ends of the base frame (1) are also symmetrically provided with slide rails (12), and electric sliders (13) slide on the slide rails (12). The top of the electric sliders (13) is connected to the bottom of the corresponding cantilever crane (11).

3. The automatic welding equipment for heating pipe joints according to claim 2, characterized in that: The lifting mechanism (21) includes a lifting cylinder (211) and a lifting platform (212) driven by the lifting cylinder (211); the driving mechanism (22) includes a driving motor (221) and a driving roller (222) driven by the driving motor (221). The drive motor (221) is installed in the lifting platform (212), and the top of the lifting platform (212) is also rotatably connected to an auxiliary roller (223) that is distributed opposite to the drive roller (222). The steam heating pipe (3) is distributed between the drive roller (222) and the auxiliary roller (223).

4. The automatic welding equipment for heating pipe joints according to claim 1, characterized in that: The displacement mechanism (41) includes a displacement cylinder (411), a connecting plate (412) disposed at the telescopic end of the displacement cylinder (411), a rack (413) disposed at one end of the connecting plate (412), and a cross (414) disposed at the end of the connecting plate (412) away from the rack (413). The telescopic end of the displacement cylinder (411) passes through the side wall of the cantilever crane (11) and is connected to the connecting plate (412).

5. The automatic welding equipment for heating tube joints according to claim 4, characterized in that: The top of the cantilever crane (11) is also provided with a crossbeam (14), and a guide rod seat (15) is provided below the crossbeam (14). A guide block (16) is slidably provided on the guide rod seat (15), and the bottom of the guide block (16) is connected to the side wall of the rack (413).

6. The automatic welding equipment for heating tube joints according to claim 5, characterized in that: The double-sided limiting mechanism (42) includes a gear (421), a support frame (422) disposed on the outside of the gear (421), a support rod (423) disposed at one end of the support frame (422), a first abutting member (424) disposed at the end of the support rod (423) away from the support frame (422), and a first welding head (425) disposed below the first abutting member (424). The gear (421) is located below the cross frame (14) and is rotatably connected to the two side walls of the cross frame (14). The gear (421) meshes with the rack (413) for transmission.

7. The automatic welding equipment for heating tube joints according to claim 6, characterized in that: The first abutting member (424) includes a threaded rod (4241), a bullseye bearing assembly (4242) disposed at one end of the threaded rod (4241), and a nut (4243) threaded onto the threaded rod (4241); the threaded rod (4241) is threaded through the side wall of the support rod (423) and is distributed at an angle.

8. The automatic welding equipment for heating tube joints according to claim 7, characterized in that: The two ends of the cross (414) are also symmetrically provided with second abutment members (426), and the second abutment members (426) and the first abutment members (424) have the same structural shape; a second welding head (427) is also provided between the second abutment members (426).

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