A direct-buried steam heat-insulating pipe joint welding device

Abstract

The present invention discloses a welding device for directly buried steam heat-insulating pipe joints, which relates to the technical field of pipeline welding equipment and includes a side docking support one and a side docking support two. When the side docking support one and the side docking support two are docked with each other, a placement space for accommodating the heat-insulating pipe joint is formed. A rotatable first guiding strip is provided on the side docking support one, and two second guiding strips that rotate synchronously with the first guiding strip are provided on the side docking support two. The two second guiding strips are respectively located in front of and behind the first guiding strip. Inner connection seats extending to the inside of the side docking support one are provided at the upper and lower ends of the first guiding strip, and an arc welding machine seat and a visual inspection camera are respectively provided on the two inner connection seats. In the present invention, the side docking support one and the side docking support two have the advantages of being portable for docking and disassembling, and can be quickly positioned at the joints of two steam heat-insulating pipes. When the side docking support one and the side docking support two are docked with each other, a placement space for accommodating the heat-insulating pipe joint is formed, which is suitable for the construction site of directly buried steam heat-insulating pipes.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding equipment, and particularly relates to a welding equipment for directly buried steam insulation pipe joints. Background Art

[0002] Most directly buried steam insulation pipes are applied in the fields of heat supply, cold supply or industrial pipelines. During the on-site direct burial laying operation of pipelines, it is necessary to weld the interfaces of the pipelines to achieve the purpose of butt-jointing the pipelines. Common arc welding methods include manual arc welding, gas shielded welding, etc. The cost is relatively low, the equipment is popular, and it is suitable for on-site construction. Plasma arc welding belongs to a more advanced process, with high energy density, fast welding speed and small deformation, but the equipment is expensive and has high technical requirements for operators, and it may be more common in factory prefabrication. During the on-site installation of pipelines, arc welding methods with strong flexibility and adaptability are mostly used.

[0003] In the existing welding methods applied to the on-site construction of steam insulation pipes, it is mostly necessary to use a fixture to position the pipeline interface, and then the construction personnel manually operate the welding equipment to perform welding operations on the pipeline interface. During the operation, it is necessary to completely weld the pipeline interface along the circumferential trajectory. Since the pipeline interface has been clamped and the construction environment is mostly in the construction pit opened for pipeline burial, during the manual welding process, it is easily restricted by the construction environment and requires multiple operations to complete the welding of the pipeline interface, resulting in an extended operation time and the operation quality is also easily affected. After the welding operation is completed, it is not convenient to perform inspection operations on the welding quality. Therefore, the present invention provides a welding equipment for directly buried steam insulation pipe joints to meet the requirements. Summary of the Invention

[0004] In view of the above problems, the present invention provides a welding equipment for directly buried steam insulation pipe joints.

[0005] To achieve the above object, the present invention provides the following technical solution: A welding equipment for directly buried steam insulation pipe joints includes a side docking support one and a side docking support two. When the side docking support one and the side docking support two are docked relative to each other, a placement space for accommodating the insulation pipe joint is formed.

[0006] On the first side docking support, there is a rotatable first guiding strip. On the second side docking support, there are two second guiding strips that rotate synchronously with the first guiding strip. The two second guiding strips are respectively located in front of and behind the first guiding strip. The first guiding strip and the second guiding strips have an overlapping area in the front view angle. At the upper and lower ends of the first guiding strip, there are inner connecting seats extending to the inside of the first side docking support. On the two inner connecting seats, there are respectively an arc welding machine seat and a vision detection camera, and both inner connecting seats are connected to the second guiding strips through a connection structure. As the first guiding strip and the second guiding strips rotate, the arc welding machine seat and the vision detection camera can move synchronously along a circular trajectory.

[0007] Further, on each of the second guiding strips, there is a first driving gear meshing with the external teeth thereof. Between the two first driving gears, there is also a second driving gear coaxially distributed therewith, and the second driving gear meshes with the external teeth of the first guiding strip. When the first driving gear meshes with the second guiding strip and rotates along a circular trajectory, the first guiding strip and the second guiding strips move synchronously until the external teeth of the first guiding strip mesh with the second driving gear.

[0008] The first driving gear and the second driving gear are both connected by the same power shaft, and on the power shaft, there is an electric driving device one that can drive it to rotate.

[0009] Further, at the upper and lower ends of the first side docking support, there are arc-shaped convex portions formed along a circular trajectory. The upper and lower ends of the first guiding strip are respectively located on the surfaces of the two convex portions. At the upper and lower ends of the second side docking support, there are recessed portions that can accommodate the convex portions. When the first side docking support and the second side docking support are docked, the convex portions and the recessed portions distributed from top to bottom are docked with each other.

[0010] Further, the connection structure includes extension plates provided on both sides of the inner connecting seat. On the side of the extension plate away from the inner connecting seat, there is a set of guiding gears and synchronous rotating wheels coaxially distributed with the guiding gears. On the two sets of guiding gears located on both sides of the inner connecting seat, there are follower racks meshingly connected thereto, and the two sets of follower racks are respectively arranged from top to bottom along the diameter direction of the guiding gears.

[0011] One end of each of the follower racks is slidably installed on the extension plate, and the other end is provided with a clamping rod. At the upper and lower ends of the second guiding strip, there are two blocking plates. When the two sets of guiding gears located on both sides of the inner connecting seat rotate in the same direction, the two sets of follower racks and the clamping rods rotate in opposite directions respectively until the two clamping rods respectively pass through the two blocking plates.

[0012] Further, the connection structure also includes a synchronous belt connecting the two synchronous rotating wheels located on both sides of the extension plate. The guiding gears and the synchronous rotating wheels on the same side of the inner connecting seat are connected by the same power shaft, and one of the two power shafts is installed with an electric driving device two.

[0013] Further, two docking frames symmetrically distributed from front to back are fixed inside each of the first side docking support and the second side docking support. A plurality of limiting roller groups arranged at equal intervals along an arc trajectory are fixed inside each of the two docking frames, and a space for the inner connection seat to pass through is formed by the gap between the two docking frames. When the structures of the two pipes are placed in the placement space formed by the first side docking support and the second side docking support, the limiting roller groups are respectively in contact with the two pipes.

[0014] Further, a first moving seat and a second moving seat are respectively fixed outside the first side docking support and the second side docking support. Universal wheels are installed at the bottoms of the first moving seat and the second moving seat. The first driving gear, the second driving gear, the driving shaft connecting the two, and the second electric driving device connected to the power shaft are all installed on the second moving seat.

[0015] Further, a first guide rail adapted to the first guide bar and two second guide rails adapted to the second guide bar are fixed on each of the first side docking support and the second side docking support. When the first side docking support and the second side docking support are docked, the first guide rails and the second guide rails located outside the first side docking support and the second side docking support are spliced into a circular track that can accommodate the first guide bar and the second guide bar to slide.

[0016] In summary, the technical effects and advantages of the present invention are as follows:

[0017] 1. The first side docking support and the second side docking support in the present invention have the advantages of portable docking and disassembly, and can quickly locate to the joint of the two steam insulation pipes. When the first side docking support and the second side docking support are docked, a placement space for accommodating the insulation pipe joint is formed, which is suitable for the construction site of directly buried steam insulation pipes.

[0018] 2. Through the combined setting of the first guide bar, the second guide bar, the arc welding machine base and the visual inspection camera, the present invention can, on the premise of not affecting the flexible docking and separation operations of the first side docking support and the second side docking support, the arc welding machine base and the visual inspection camera can respectively perform welding and visual inspection operations on the steam insulation pipe along the circumferential trajectory, improving the comprehensiveness of welding and visual inspection operations, improving the efficiency of welding operations, and facilitating the observation of the quality of welding operations. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1Schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 Schematic diagram of the structure of the second perspective of the present invention.

[0022] Figure 3 Schematic diagram of the connection structure between the side docking support one and the first guide bar of the present invention.

[0023] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at A in the figure.

[0024] Figure 5 For the present invention Figure 3 Enlarged schematic diagram of the structure at B in the figure.

[0025] Figure 6 Schematic diagram of the connection structure between the docking support and the moving seat one of the present invention.

[0026] Figure 7 Schematic diagram of the connection structure between the side docking support two and the second guide bar of the present invention.

[0027] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at C in the figure.

[0028] Figure 9 Schematic diagram of the connection structure between the side docking support two and the moving seat two of the present invention.

[0029] Figure 10 Schematic diagram of the connection between the inner connection seat, the arc welding machine seat and the connection structure of the present invention.

[0030] Figure 11 Schematic diagram of the inner connection seat, the vision inspection camera and the connection structure of the present invention.

[0031] In the figure: 1. Side docking support one; 2. Side docking support two; 3. First guide bar; 31. Inner connection seat; 32. Arc welding machine seat; 33. Vision inspection camera; 4. Second guide bar; 41. Intercepting plate; 5. Moving seat one; 6. Moving seat two; 7. First driving gear; 8. Second driving gear; 9. Docking frame; 10. Limit roller group; 11. First guide rail; 12. Second guide rail; 13. Extension plate; 14. Guide gear; 15. Synchronous runner; 16. Follow-up rack; 17. Positioning rod; 18. Synchronous belt. Detailed implementation manner

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1: Refer to Figure 1 、 Figure 2 A direct-buried steam heat-insulating pipe joint welding device shown. The device includes a side docking support one 1 and a side docking support two 2. During the actual use of the device, when the joints of two steam heat-insulating pipes are opposite interfaces, the side docking support one 1 and the side docking support two 2 can be controlled to be located on both sides of the docking part of the two steam heat-insulating pipes to perform docking operations. When the side docking support one 1 and the side docking support two 2 are docked, a placement space for accommodating the heat-insulating pipe joint is formed. Inside this space, the welding operation of the steam heat-insulating pipe joint can be carried out. The side docking support one 1 and the side docking support two 2 have the advantages of portable docking and disassembly, can quickly locate to the joints of the two steam heat-insulating pipes, and are suitable for the construction site of direct-buried steam heat-insulating pipes.

[0034] In the present invention, a rotatable first guiding strip 3 is provided on the side docking support one 1, and two second guiding strips 4 that rotate synchronously with the first guiding strip 3 are provided on the side docking support two 2. The two second guiding strips 4 are respectively located in front of and behind the first guiding strip 3. The first guiding strip 3 and the second guiding strips 4 have an overlapping area in the front view angle. Refer to Figure 1 shown.

[0035] As Figure 1 、 Figure 2 shown, inner connecting seats 31 extending to the inside of the side docking support one 1 are provided at both the upper and lower ends of the first guiding strip 3. An arc welding machine seat 32 and a visual inspection camera 33 are respectively provided on the two inner connecting seats 31. When the side docking support one 1 and the side docking support two 2 are docked, the two inner connecting seats 31 distributed from top to bottom are both connected to the second guiding strip 4 through a connection structure. As the first guiding strip 3 and the second guiding strips 4 rotate, the arc welding machine seat 32 and the visual inspection camera 33 can move synchronously along a circular trajectory.

[0036] As Figure 4 、 Figure 5 shown, during the process of the arc welding machine seat 32 moving along the circular trajectory, it can perform a comprehensive welding operation on the joints of the two steam heat-insulating pipes until the joints of the two steam heat-insulating pipes are completely connected. During the welding operation, it can quickly perform welding operations on the positions of the heat-insulating pipe joints that are not easily operated manually until the interfaces of the two steam heat-insulating pipes are welded.

[0037] As Figure 4 、Figure 5 As shown, after the welding operation is completed, as the first guide bar 3 and the second guide bar 4 continue to rotate, the visual inspection camera 33 can perform a visual inspection operation on the weld at the joint of the steam heat preservation pipe, observe whether the weld quality meets the standard, and if it does not meet the standard, a repair welding operation needs to be carried out.

[0038] In summary, in the present invention, through the combined setting of the first guide bar 3, the second guide bar 4, the arc welding machine base 32 and the visual inspection camera 33, on the premise of not affecting the flexible docking and separation operations of the side docking support one 1 and the side docking support two 2, when the side docking support one 1 and the side docking support two 2 are docked, the arc welding machine base 32 and the visual inspection camera 33 can respectively perform welding and visual inspection operations on the steam heat preservation pipe along the circumferential trajectory, improving the comprehensiveness of the welding and visual inspection operations and avoiding omission phenomena. Compared with manual welding operations, the efficiency of the welding operation is improved. At the same time, during the welding operation, it is convenient to observe the quality of the welding operation so as to promptly carry out a repair welding operation.

[0039] Specifically, as Figure 1 、 Figure 2 shown, in order to enable the first guide bar 3 and the second guide bar 4 to rotate smoothly along the circumferential trajectory after splicing, first driving gears 7 meshing with its external teeth are provided on the second guide bar 4, and a second driving gear 8 coaxially distributed with them is also provided between the two first driving gears 7. The second driving gear 8 meshes with the external teeth of the first guide bar 3. When the first driving gear 7 meshes with the second guide bar 4 and rotates along the circumferential trajectory, the first guide bar 3 and the second guide bar 4 move synchronously. Since the first guide bar 3 and the second guide bar 4 have an overlapping area in the front view angle, when the first guide bar 3 rotates with the second guide bar 4 to a certain moving degree, the external teeth of the first guide bar 3 mesh with the second driving gear 8.

[0040] At this time, as the first driving gear 7 and the second driving gear 8 continue to rotate, the visual inspection camera 33 can perform continuous visual inspection operations on the weld at the joint of the steam heat preservation pipe along the circumferential trajectory and transmit the inspection image to the display, and the staff can observe whether the weld quality meets the standard.

[0041] As Figure 9 shown, in order to enable the first driving gear 7 and the second driving gear 8 to rotate synchronously, the first driving gear 7 and the second driving gear 8 are both connected by the same power shaft, and an electric driving device one for driving its rotation is provided on the power shaft.

[0042] It is worth mentioning that in the present invention, both the upper and lower ends of the side docking support 1 form arc-shaped raised portions along the circumferential trajectory. The upper and lower ends of the first guide strip 3 are respectively located on the surfaces of the two raised portions. Both the upper and lower ends of the side docking support 2 are provided with recessed portions capable of accommodating the raised portions. When the side docking support 1 and the side docking support 2 are docked, the raised portions and the recessed portions distributed from top to bottom are docked with each other. The combined setting of the raised portions and the recessed portions aims to enable the arc welding base 32 and the vision detection camera 33 to be accurately distributed above and below the steam heat preservation pipe joint during the process of moving with the side docking support 1 and docking with the side docking support 2, ensuring the accuracy of the position distribution of the arc welding base 32 and the vision detection camera 33. Refer to Figure 3 as shown.

[0043] Embodiment 2: On the basis of Embodiment 1, as Figure 8 , Figure 10 and Figure 11 shown, the connection structure includes extension plates 13 provided on both sides of the inscribed seat 31. A set of guide gears 14 and synchronous runners 15 coaxially distributed with the guide gears 14 are provided on the sides of the extension plates 13 away from the inscribed seat 31. Follow-up racks 16 are engaged with the two sets of guide gears 14 located on both sides of the inscribed seat 31, and the two sets of follow-up racks 16 are arranged from top to bottom along the diameter direction of the guide gears 14 respectively.

[0044] As Figure 10 , Figure 11 shown, one ends of the follow-up racks 16 are slidably installed on the extension plates 13, and position rods 17 are provided at the other ends. Two intercepting plates 41 are provided at the upper and lower ends of the second guide strip 4. When the two sets of guide gears 14 located on both sides of the inscribed seat 31 rotate in the same direction, the two sets of follow-up racks 16 and the position rods 17 rotate in opposite directions respectively until the two position rods 17 pass through the two intercepting plates 41 respectively.

[0045] After the two position rods 17 pass through the two intercepting plates 41, the positions of the two intercepting plates 41 can be locked, so as to achieve the purpose of connecting the inscribed seat 31 with the front and rear second guide strips 4, improving the tightness when the first guide strip 3 is connected to the second guide strip 4. Under the action of the connection structure, the front and rear second guide strips 4 drive the first guide strip 3, the inscribed seat 31, the arc welding base 32 and the vision detection camera 33 to move smoothly.

[0046] Specifically, as Figure 10 , Figure 11As shown, the connection structure further includes a synchronous belt 18 that connects two synchronous rotating wheels 15 located on both sides of the extension plate 13. The guiding gears 14 and the synchronous rotating wheels 15 on the same side of the inner connecting seat 31 are connected by the same power shaft, and an electric driving device II is installed on one of the two power shafts. When the electric driving device II drives the synchronous rotating wheel 15 on one side of the inner connecting seat 31 to rotate, under the connection of the synchronous belt 18, the synchronous rotating wheels 15 and the guiding gears 14 on both sides of the inner connecting seat 31 can rotate synchronously in the same direction, so as to drive the two follower racks 16 and the positioning rods 17 to rotate in opposite directions respectively, and the positioning operation of the intercepting plates 41 distributed in front of and behind the inner connecting seat 31 can be quickly implemented.

[0047] After the two inner connecting seats 31 distributed from top to bottom are both connected to the second guiding strip 4 through the connection structure, the side docking support I 1 and the side docking support II 2 can be tightly connected at the same time, reducing the docking error and improving the accuracy when the side docking support I 1 and the side docking support II 2 are docked.

[0048] As Figure 6 、 Figure 9 shown, in the present invention, two symmetrically distributed docking frames 9 are fixed in both the side docking support I 1 and the side docking support II 2 from front to back. A plurality of limiting roller groups 10 arranged at equal intervals along an arc trajectory are fixed in both docking frames 9, and a space for the inner connecting seat 31 to pass through is formed between the two docking frames 9. When the structures of the two pipelines are placed in the placement space formed by the side docking support I 1 and the side docking support II 2, the limiting roller groups 10 are respectively abutted against the two pipelines. The two inner connecting seats 31 distributed from top to bottom can respectively carry the arc welding machine base 32 and the vision detection camera 33 to move outside the pipeline interface.

[0049] As Figure 3 、 Figure 7 shown, in order to maintain the stability of the side docking support I 1 and the side docking support II 2 and facilitate the movement of the side docking support I 1 and the side docking support II 2 at the construction site, a moving seat I 5 and a moving seat II 6 are respectively fixed outside the side docking support I 1 and the side docking support II 2, and universal wheels are installed at the bottoms of the moving seat I 5 and the moving seat II 6. The combined setting of the moving seat I 5 and the moving seat II 6 can facilitate the quick and stable operation of the side docking support I 1 and the side docking support II 2 and implement the docking and separation operations of the two. Refer to Figure 6 、 Figure 9 shown, in order to maintain the stability of the first driving gear 7, the second driving gear 8, the driving shaft connecting the two, and the electric driving device II connected to the power shaft, in the present invention, the above components are all installed on the moving seat II 6.

[0050] As Figure 6 、 Figure 9As shown, in the present invention, a first guide rail 11 adapted to the first guide bar 3 and two second guide rails 12 adapted to the second guide bar 4 are fixed on both the side docking support one 1 and the side docking support two 2. When the side docking support one 1 and the side docking support two 2 are docked, the first guide rails 11 and the second guide rails 12 located on the outer sides of the side docking support one 1 and the side docking support two 2 are spliced into a circular track that can accommodate the first guide bar 3 and the second guide bar 4 to slide.

[0051] The combined setting of the first guide bar 3 and the second guide bar 4 has a limiting effect on the first guide bar 3 and the second guide bar 4, ensuring the tightness of the connection between the first guide bar 3 and the second guide bar 4, preventing the first guide bar 3 and the second guide bar 4 from shifting during rotation, and further ensuring the stability of the first guide bar 3 and the second guide bar 4 when rotating along the circular track.

[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A direct-buried steam heat-insulating pipe joint welding device, characterized in that: It includes a side docking support one (1) and a side docking support two (2). When the side docking support one (1) and the side docking support two (2) are docked with each other, a placement space for accommodating a heat preservation pipe joint is formed; A rotatable first guiding strip (3) is provided on the side docking support one (1), and two second guiding strips (4) that rotate synchronously with the first guiding strip (3) are provided on the side docking support two (2). The two second guiding strips (4) are respectively located in front of and behind the first guiding strip (3). The first guiding strip (3) and the second guiding strips (4) have an overlapping area in the front view angle; both the upper and lower ends of the first guiding strip (3) are provided with internal connection seats (31) extending to the inside of the side docking support one (1). An arc welding machine seat (32) and a vision inspection camera (33) are respectively provided on the two internal connection seats (31), and both the two internal connection seats (31) are connected to the second guiding strip (4) through an engagement structure; as the first guiding strip (3) and the second guiding strips (4) rotate, the arc welding machine seat (32) and the vision inspection camera (33) can move synchronously along a circular trajectory; The engagement structure includes extension plates (13) provided on both sides of the internal connection seat (31). A set of guiding gears (14) and synchronous rotating wheels (15) coaxial with the guiding gears (14) are respectively provided on one side of the extension plates (13) away from the internal connection seat (31). A follower rack (16) is engaged and connected to each of the two sets of guiding gears (14) located on both sides of the internal connection seat (31). The two sets of follower racks (16) are respectively arranged from top to bottom along the diameter direction of the guiding gears (14); One end of each of the follower racks (16) is slidably installed on the extension plate (13), and a clamping rod (17) is provided at the other end. Two intercepting plates (41) are respectively provided at the upper and lower ends of the second guiding strip (4). When the two sets of guiding gears (14) located on both sides of the internal connection seat (31) rotate in the same direction, the two sets of follower racks (16) and the clamping rods (17) rotate in opposite directions respectively until the two clamping rods (17) respectively pass through the two intercepting plates (41).

2. The direct-buried steam heat-insulating pipe joint welding equipment according to claim 1, characterized in that: A first driving gear (7) meshing with the external teeth of the second guiding strip (4) is provided on the second guiding strip (4). A second driving gear (8) coaxial with the first driving gear (7) is further provided between the two first driving gears (7). The second driving gear (8) meshes with the external teeth of the first guiding strip (3). When the first driving gear (7) meshes with the second guiding strip (4) and rotates along a circular trajectory, the first guiding strip (3) and the second guiding strip (4) move synchronously until the external teeth of the first guiding strip (3) mesh with the second driving gear (8); The first driving gear (7) and the second driving gear (8) are both connected by the same power shaft, and an electric driving device one for driving its rotation is provided on the power shaft.

3. The direct-buried steam heat-insulating pipe joint welding equipment according to claim 2, characterized in that: Both the upper and lower ends of the side docking support one (1) form arc-shaped convex parts along the circumferential trajectory. The upper and lower ends of the first guide bar (3) are respectively located on the surfaces of the two convex parts. Both the upper and lower ends of the side docking support two (2) are provided with concave parts that can accommodate the convex parts. When the side docking support one (1) and the side docking support two (2) are docked, the convex parts and the concave parts distributed from top to bottom are docked with each other.

4. The direct-buried steam heat-insulating pipe joint welding equipment according to claim 1, characterized in that: The connection structure further includes a synchronous belt (18) connecting two synchronous rotating wheels (15) located on both sides of the extension plate (13). The guide gear (14) and the synchronous rotating wheel (15) on the same side of the inner connection seat (31) are connected by the same power shaft, and an electric drive device two is installed on one of the two power shafts.

5. The direct-buried steam heat-insulating pipe joint welding equipment according to claim 1, characterized in that: Both inside the side docking support one (1) and the side docking support two (2), two docking frames (9) symmetrically distributed from front to back are fixed. Inside both of the two docking frames (9), a plurality of limit roller groups (10) arranged at equal intervals along the arc trajectory are fixed. And the gap between the two docking frames (9) forms a space that can accommodate the inner connection seat (31) to pass through. When the structures of the two pipes are placed in the placement space formed by the side docking support one (1) and the side docking support two (2), the limit roller groups (10) are respectively abutted against the two pipes.

6. The direct-buried steam heat-insulating pipe joint welding equipment according to claim 2, wherein: Outside the side docking support one (1) and the side docking support two (2), a moving seat one (5) and a moving seat two (6) are respectively fixed. Universal wheels are installed at the bottom ends of the moving seat one (5) and the moving seat two (6). The first driving gear (7), the second driving gear (8), the driving shaft connecting the two, and the electric drive device two connected to the power shaft are all installed on the moving seat two (6).

7. The direct-buried steam heat-insulating pipe joint welding equipment according to claim 1, characterized in that: On both the side docking support one (1) and the side docking support two (2), a first guide rail (11) adapted to the first guide bar (3) and two second guide rails (12) adapted to the second guide bar (4) are fixed. When the side docking support one (1) and the side docking support two (2) are docked, the first guide rails (11) and the second guide rails (12) located outside the side docking support one (1) and the side docking support two (2) are spliced into a circular track that can accommodate the first guide bar (3) and the second guide bar (4) to slide.

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