Opening alignment auxiliary device for pipeline welding

Abstract

The utility model discloses an alignment auxiliary device for pipeline welding, which is arranged at the alignment ends of two corresponding pipelines and comprises a first framework, a second framework and at least two framework connecting screws, the outer side of a pipe body of each pipeline is sleeved with the corresponding first framework, and each first framework comprises a countershaft ring and a plurality of fixing screw rods. According to the pipeline butt-joint device, through matching of the butt-joint ring and the adjusting screw rod, the pipeline butt-joint construction operation is simplified, manpower and time are saved, the working efficiency is greatly improved, and due to the fact that the adjusting screw rod exists, the bent portion of a pipeline can be corrected in time, and the welding forming quality of the pipeline after butt-joint connection can be better guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of pipeline installation and construction technology, specifically to an auxiliary device for pipeline welding and alignment. Background Technology

[0002] In current electromechanical piping installation, when welding two metal pipes, the alignment is mostly achieved manually on-site. Workers need to make multiple adjustments to ensure the pipe ends are aligned, ultimately meeting the quality requirements for pipe alignment. Specifically, one pipe is first placed horizontally in the designated position, and then the joint of the other pipe is aligned with the joint of the first pipe (see reference). Figure 2 Depending on the location during welding, the pipes to be welded are specifically defined as: pipe butt end - pipe body - pipe butt end; where the pipe butt interface is the end face of the pipe butt end. During the alignment process of the second pipe, since the pipe butt interfaces are not perfectly circular, if the edges of the two pipes are forced to be aligned, the axes may not coincide, causing partial offset of the welding ports of the two pipes. Therefore, sometimes auxiliary devices are used to correct the pipes, such as hammering, to make the shape of the pipe butt interface as close to a perfect circle as possible.

[0003] However, this traditional method of pipe alignment requires a high level of skill and experience from the construction workers, and the workload of pipe alignment is also very large. Not only is the work efficiency low, but since the pipes are entirely adjusted by the operators during the connection process, the operators are prone to fatigue, which can indirectly lead to connection errors. Ultimately, it is difficult to ensure the consistent quality of pipe alignment connections.

[0004] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0005] This utility model provides an auxiliary device for pipe welding and alignment, which aims to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a pipe welding joint auxiliary device, wherein the joint auxiliary device is installed at the joint ends of two corresponding pipes, and the joint auxiliary device includes a first frame, a second frame, and at least two frame connecting screws.

[0007] Each of the pipes is fitted with the first frame on its outer side. The first frame includes a collar and multiple fixing screws. Along the axial direction of the pipe, the collars of each first frame are connected in series by the frame connecting screws to achieve coaxial fixation.

[0008] The coupling collars are spaced apart and sleeved on the outside of the pipe body, and the fixing screws are disposed between the coupling collars and the pipe, with each fixing screw evenly distributed along the circumference of the pipe.

[0009] The fixing screw is set radially to the pipe with its own length as the reference, and the outer end is rotated and positioned on the shaft collar, while the inner end is abutted and positioned against the outside of the pipe body.

[0010] Each of the aforementioned fixing screws achieves radial movement relative to the pipe through the engagement of its outer end and a coupling collar, so that the coupling collar is coaxially positioned with the pipe;

[0011] The second frame is fitted on the outer side of the joint end of each of the pipes. The second frame includes a joint ring and multiple adjusting screws. The joint ring of each second frame is coaxially arranged with the shaft ring of the first frame and is radially limited by the frame connecting screws.

[0012] The matching ring is sleeved on the outside of the matching end of the pipe, and the adjusting screw is disposed between the matching ring and the pipe, with each adjusting screw evenly distributed along the circumference of the pipe.

[0013] The adjusting screw is set radially to the pipe with its own length as the reference, and its outer end is rotated and positioned on the matching ring, while its inner end is abutted and positioned against the outside of the matching end of the pipe.

[0014] Each of the adjusting screws achieves radial movement relative to the pipe through rotation of its outer end and the aligning ring, in order to shape the aligning end of the pipe;

[0015] The matching ring is provided with an arc-shaped groove, and the center of the arc corresponding to the arc-shaped groove is concentric with the center of the matching ring.

[0016] The skeleton connecting screw passes through the arc-shaped sliding groove, which radially limits the engagement ring, and at the same time allows the engagement ring to move axially along the length direction of the skeleton connecting screw or rotate around its own center.

[0017] The reason for setting a second skeleton at the pipe joint is that the common pipe joint is not a perfect circle; for example, it is an elliptical structure. When aligning and welding with the joint of another pipe, it is easy to have a low welding quality. Setting a second skeleton can correct the elliptical shape into a circle.

[0018] In the above, at least one first skeleton and one second skeleton must be installed on each pipe. Only in this way can the joint end of each pipe be trimmed.

[0019] In the above, the radial setting of the pipe is based on its own length direction, which means it is set perpendicular to the pipe axis. This ensures that the inner end of both the adjusting screw and the fixing screw faces the pipe axis.

[0020] Secondly, since the degree of curvature at the pipe joint is uncontrollable, if the curvature is large, the adjusting screw in a fixed position may not be able to fully correct the curvature (because if the adjusting screw in a fixed position is not aligned with the curvature, the correction of the curvature will be uneven. To solve this problem, multiple adjusting screws can be used for correction, but this makes the installation of the entire jointing auxiliary device more difficult and time-consuming). However, with the cooperation design of the arc-shaped sliding groove and the connecting screw of the skeleton, the adjusting screw can be adjusted along the curvature, and by moving the adjusting screw to the center of the curvature, the correction of the curvature can be more thorough and even.

[0021] In a further technical solution, the first frame also includes a plurality of first fixing blocks fixed to the surface of the collar; the first fixing blocks are provided with threaded holes;

[0022] The fixing screws are configured in a one-to-one correspondence with the first fixing blocks, and the outer end of the fixing screw is rotatably positioned in the threaded hole of the first fixing block. This design allows the adjusting screw to quickly complete the radial movement along the coupling ring.

[0023] In a further technical solution, the second frame also includes multiple second fixing blocks fixed to the sidewall of the mating ring.

[0024] The second fixing block has a threaded hole;

[0025] The adjusting screw is provided in a one-to-one correspondence with the second fixing block, and the outer end of the adjusting screw is rotatably positioned in the threaded hole on the second fixing block.

[0026] In a further technical solution, the inner end of the fixing screw is a coaxial abutment head;

[0027] The inner end of the adjusting screw is a dressing head.

[0028] A further technical solution is that the trimming head is conical. This design prevents the contact range between the adjusting screw and the bent part from being too large. If the contact range between the trimming head and the bent part is too large, it is easy for the bent part to be not properly trimmed, while the intact part is bent.

[0029] In a further technical solution, the coaxial abutment head is a cylindrical structure with an abutment plane at its end that abuts against the outer wall of the pipe body.

[0030] A further technical solution involves evenly distributing the connecting screws of each skeleton around the axis of the pipe at equal angles.

[0031] A further technical solution involves a clearance fit between the skeleton connecting screw and the arc-shaped sliding groove. This design allows for quick and relatively precise adjustment of the adjusting screw's position, while also preventing the mating ring from jamming with the skeleton connecting screw.

[0032] In a further technical solution, a through hole is provided on the coupling collar, the skeleton connecting screw passes through the through hole, and both ends of the skeleton connecting screw are fixed to the coupling collar by fixing nuts.

[0033] The fixing nut is a nut structure in the prior art, and no further restrictions are imposed here.

[0034] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0035] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0036] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0037] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0038] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0039] The working principle and advantages of this utility model are as follows:

[0040] This utility model simplifies pipeline alignment operations, saves manpower and time, and greatly improves work efficiency through the cooperation of the alignment ring and the adjusting screw. Furthermore, the presence of the adjusting screw allows for timely correction of the bent parts at the pipeline alignment ends, thereby better ensuring the quality of the welded pipeline.

[0041] Specifically, firstly, two first-stage frames are fixed to the outer sides of the two pipes respectively. Since these two pipes need to be joined, their ends are positioned opposite each other, meaning the distance between the two first-stage frames is small. Then, two second-stage frames are placed between the two first-stage frames and fitted onto the outer sides of the joint ends of the two pipes respectively. Finally, the four frames are connected in series using frame connecting screws. This completes the rapid connection of the pipes. Since the outer contours of the joint ends of the two pipes are not perfectly circular, the adjusting screw can be driven to move radially along the joint ring under external force. Because the end of the adjusting screw closest to the pipe abuts against the outer wall of the joint end of the pipe, the adjusting screw can gradually straighten the bent parts.

[0042] Since the degree of curvature at the pipe joint is uncontrollable, if the curvature is large, the adjusting screw in a fixed position may not be able to fully correct the curvature. Therefore, by using the combination of the arc-shaped sliding groove and the connecting screw of the skeleton, the adjusting screw can be adjusted along the curvature. By moving the adjusting screw to the center of the curvature, the correction of the curvature can be more thorough and uniform.

[0043] Specifically, when the two second frames are respectively fitted onto the outer sides of the two pipe ends, the adjusting screws on each second frame will abut against the corresponding pipe end sidewall. One or more adjusting screws will contact the curved part of the pipe end sidewall. At this time, the adjusting screws that are fully aligned with the curved part can be guided to move along the radial direction of the aligning ring to correct the curved part. Then, for the adjusting screws whose ends are not aligned with the curved part, the contact between each adjusting screw and the pipe sidewall can be slightly adjusted (i.e., loosen the adjusting screw) so that the aligning ring can rotate around the pipe axis until the adjusting screws whose ends are not aligned with the curved part are adjusted to be aligned with the curved part. After that, the adjusting screws are guided to move along the radial direction of the aligning ring again to correct the curved part. Attached Figure Description

[0044] Appendix Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;

[0045] Appendix Figure 2 This is a front view of two pipes connected in an embodiment of this utility model;

[0046] Appendix Figure 3 This is a schematic diagram of the arc-shaped groove structure in an embodiment of the present utility model. Figure 3 The second skeleton on one of the pipes was omitted.

[0047] Appendix Figure 4 This is a schematic diagram of the second fixing block structure in an embodiment of the present utility model;

[0048] Appendix Figure 5 This is a schematic diagram of the diaphragm structure in an embodiment of the present utility model;

[0049] Appendix Figure 6 This is a schematic diagram of the collar structure in an embodiment of the present invention;

[0050] Appendix Figure 7 This is a schematic diagram of the through hole structure in an embodiment of the present invention.

[0051] In the above attached diagram: 1. Pipe; 2. First frame; 3. Second frame; 4. Frame connecting screw; 5. Alignment ring; 6. Adjusting screw; 7. Through hole; 8. Arc-shaped slide groove; 9. Fixing nut; 10. Coaxial abutment head; 11. Second fixing block; 12. Trimming head; 13. Alignment ring; 14. Fixing block; 15. Fixing screw. Detailed Implementation

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0053] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0054] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0055] See appendix Figures 1-7 As shown, a pipe welding jointing auxiliary device is installed at the joint ends of two corresponding pipes 1. The jointing auxiliary device includes a first frame 2, a second frame 3, and at least two frame connecting screws 4.

[0056] Each pipe 1 is fitted with a first frame 2 on its outer side. The first frame 2 includes a shaft collar 13 and multiple fixing screws 15. Along the axial direction of the pipe 1, the shaft collar 13 of each first frame 2 is connected in series by the frame connecting screws 4 to achieve coaxial fixation.

[0057] The collar 13 is spaced out and sleeved on the outside of the pipe body of the pipe 1. The fixing screws 15 are arranged between the collar 13 and the pipe 1, and each fixing screw 15 is evenly distributed along the circumference of the pipe 1.

[0058] The fixing screw 15 is radially positioned relative to the pipe 1 with its own length as a reference, and its outer end is rotated and positioned on the shaft collar 13, while its inner end is abutted and positioned against the outside of the pipe body of the pipe 1.

[0059] Each fixing screw 15 achieves radial movement relative to the pipe 1 through the engagement of its outer end and the collar 13, so that the collar 13 is coaxially arranged with the pipe 1;

[0060] A second frame 3 is fitted on the outer side of the joint end of each pipe 1. The second frame 3 includes a joint ring 5 and multiple adjusting screws 6. The joint ring 5 of each second frame 3 is coaxially arranged with the shaft ring 13 of the first frame 2 and is radially limited by the frame connecting screw 4.

[0061] The matching ring 5 is fitted on the outside of the matching end of the pipe 1, and the adjusting screw 6 is set between the matching ring 5 and the pipe 1, with each adjusting screw 6 evenly distributed along the circumference of the pipe 1.

[0062] The adjusting screw 6 is set radially to the pipe 1 with its own length as the reference, and its outer end is rotated and positioned on the matching ring 5, while its inner end is abutted and positioned against the outer side of the matching end of the pipe 1.

[0063] Each adjusting screw 6 achieves radial movement relative to the pipe 1 by rotating its outer end and the mating ring 5, in order to shape the mating end of the pipe 1;

[0064] An arc-shaped groove 8 is provided on the mating ring 5, and the center of the arc corresponding to the arc groove 8 is concentric with the center of the mating ring 5.

[0065] The skeleton connecting screw 4 passes through the arc-shaped sliding groove 8, which radially limits the mating ring 5, and at the same time allows the mating ring 5 to move axially along the length of the skeleton connecting screw 4 or rotate around its own center.

[0066] It should be noted that the number of first frame 2 and second frame 3 is not fixed, but at least one first frame 2 and one second frame 3 must be installed on each pipe 1. See the specific details below. Figure 1 , Figure 2 and Figure 3 .

[0067] The following example illustrates the installation of a first frame 2 and a second frame 3 on pipe 1:

[0068] This utility model simplifies the construction work at the joint end of the pipeline 1 by using the matching ring 5 and the adjusting screw 6, saving manpower and time, greatly improving work efficiency, and the presence of the adjusting screw 6 can promptly correct the bending parts of the pipeline 1, thereby better ensuring the welding quality of the pipeline 1 after the joint connection.

[0069] Specifically, firstly, two first skeletons 2 are fixed to the outer sides of the two pipes 1 respectively. Since these two pipes 1 need to be connected, their ends are positioned opposite each other, meaning the distance between the two first skeletons 2 is small. Then, two second skeletons 3 are placed between the two first skeletons 2 and fitted onto the outer sides of the ends of the two pipes 1 respectively. Finally, these four skeletons are connected in series by skeleton connecting screws 4. This completes the rapid connection of the pipes 1. Since the outer contours of the ends of the two pipes 1 are not perfectly circular, the adjusting screw 6 on the connection ring 5 can be moved under external force, causing it to move radially along the pipe 1. Since the end of the adjusting screw 6 closest to the pipe 1 (i.e., the trimming head 12 mentioned below) abuts against the outer wall of the end of the pipe 1, the adjusting screw 6 can gradually trim the bent parts to make the ends of the pipes 1 appear circular.

[0070] However, since the degree of curvature at the joint end of pipe 1 is uncontrollable, if the curvature is large, the adjusting screw 6 in a fixed position may not be able to fully correct the curvature. Therefore, by using the combination design of the arc-shaped sliding groove 8 and the skeleton connecting screw 4, the adjusting screw 6 can be adjusted along the curvature. By moving the adjusting screw 6 to the center of the curvature, the correction of the curvature can be more thorough and uniform.

[0071] Specifically, when the two second frames 3 are respectively fitted onto the outer sides of the two pipes 1 at their opposite ends, the trimming head 12 on each adjusting screw 6 will abut against the corresponding pipe 1 opposite end sidewall. One or more adjusting screws 6 will contact the curved part of the opposite end sidewall. At this time, the adjusting screw 6 that is fully aligned with the curved part can be guided to move along the radial direction of the opposite ring 5, so that the curved part is pressed and trimmed by the trimming head 12. Then, for the adjusting screw 6 whose end is not aligned with the curved part, the contact between each adjusting screw 6 and the sidewall of the pipe 1 can be slightly adjusted (i.e., loosen the adjusting screw 6), so that the opposite ring 5 can rotate around the axis of the pipe 1 (or guide the opposite ring 5 to slide along the axis of the pipe 1) until the adjusting screw 6 whose trimming head 12 is not aligned with the curved part is adjusted to be aligned with the curved part. Then, the adjusting screw 6 is guided to move along the radial direction of the opposite ring 5 again, so that the curved part is trimmed.

[0072] It should be noted that the skeleton connecting screw 4 passes through the arc-shaped sliding groove 8, which radially limits the alignment ring 5, and at the same time allows the alignment ring 5 to move axially along the length of the skeleton connecting screw 4 or rotate around its own center. By adjusting the contact position between the inner end of the adjusting screw 6 and the alignment end of the pipe 1, a more precise alignment end shaping operation can be achieved.

[0073] like Figure 5 As shown, the length of the arc-shaped groove 8 will affect the rotation angle of the mating ring 5.

[0074] In some specific embodiments, the first frame 2 further includes a plurality of first fixing blocks 14 fixed to the surface of the collar 13; the first fixing blocks 14 are provided with threaded holes;

[0075] The fixing screw 15 is set in a one-to-one correspondence with the first fixing block 14, and the outer end of the fixing screw 15 is rotated and positioned in the threaded hole of the first fixing block 14.

[0076] The inner end of the fixing screw 15 is a coaxial abutment head 10;

[0077] In some specific embodiments, the coaxial abutment head 10 is a cylindrical structure with an abutment plane at its end that abuts against the outer wall of the pipe 1.

[0078] Compared to a conical structure, a cylindrical structure has a larger contact area with the outer wall of pipe 1, resulting in higher stability.

[0079] In order to quickly fix the two pipes 1 and drive the axes of the two pipes 1 to coincide, specifically, first adjust the fixing screw 15 on the first coupling ring 13, that is, drive the fixing screw 15 to move on the first fixing block 14 along the radial direction of the coupling ring 13 away from the center of the coupling ring 13. Then insert the end of the pipe 1 into the coupling ring 13. Then rotate all the fixing screws 15 so that all the fixing screws 15 abut against the outer wall of the pipe 1, and at the same time guide the axis of the pipe 1 to coincide with the axis of the coupling ring 13.

[0080] Then, follow the same steps to fix the second pipe 1.

[0081] In some specific embodiments, the second frame 3 further includes a plurality of second fixing blocks 11 fixed to the side wall of the mating ring 5.

[0082] The second fixing block 11 has a threaded hole;

[0083] The adjusting screw 6 is set in a one-to-one correspondence with the second fixing block 11, and the outer end of the adjusting screw 6 is rotated and positioned in the threaded hole on the second fixing block 11.

[0084] Each adjusting screw 6 is respectively positioned and connected to the threaded hole on each second fixing block 11.

[0085] There are no specific requirements for the setting angle and number of adjusting screws 6. As long as the screws are turned, the cone below (i.e. the trimming head 12) can trim the arc surface of the outer wall of the pipe end.

[0086] Furthermore, the method of threaded connection between the threaded rod (i.e., the adjusting screw 6) and the second fixed block 11 is chosen to make the efficiency of the adjusting screw 6 moving along the radial direction of the mating ring 5 relatively high (not limited to the threaded connection method, the adjusting screw 6 can also be set as an electric push rod, a lead screw drive, or a pin and multiple pin holes to achieve the movement along the radial direction of the mating ring 5, but the latter three methods are more complicated to operate, so they have a lower priority).

[0087] In some specific embodiments, the inner end of the adjusting screw 6 is a trimming head 12.

[0088] In some specific embodiments, the trimming head 12 is conical.

[0089] This design ensures that the contact range between the adjusting screw 6 and the bent part is not too large. If the contact range between the trimming head 12 and the bent part is too large, the bent part may not be properly trimmed, while the intact part may be bent.

[0090] In some specific embodiments, each skeleton connecting screw 4 is evenly distributed at equal angles around the axis of the pipe 1.

[0091] If two skeleton connecting screws 4 are provided, the two skeleton connecting screws 4 are symmetrically arranged about the axis of pipe 1. If three or more skeleton connecting screws 4 are provided, all skeleton connecting screws 4 are evenly distributed around the axis of pipe 1 at equal angles.

[0092] The above design allows for a more balanced distribution of the restrictive forces on the two second frames 3 and the two first frames 2.

[0093] In some specific embodiments, the skeleton connecting screw 4 and the arc-shaped sliding groove 8 are in clearance fit.

[0094] Specifically, the width of the arc-shaped groove 8 is 2mm larger than the diameter of the skeleton connecting screw 4, in order to prevent the mating ring 5 from getting stuck with the skeleton connecting screw 4.

[0095] With the help of the design of the fixing nut 9, the collar 13 and the skeleton connecting screw 4 can be fully fixed. Furthermore, the skeleton connecting screw 4 and the through hole 7 can be connected by a thread or not, depending on the requirements.

[0096] In some specific embodiments, a through hole 7 is provided on the collar 13, the skeleton connecting screw 4 passes through the through hole 7, and both ends of the skeleton connecting screw 4 are fixed to the collar 13 by fixing nuts 9.

[0097] Working principle:

[0098] The two pipes 1 that need to be aligned are pre-connected, that is, the two pipes 1 are placed close together with their mouths facing each other; a first frame 2 is fitted onto the aligned ends of the two pipes 1 respectively; a second frame 3 is fitted onto the connection point of the two pipes 1 between the two first frames 2; the aligning rings 13 of each first frame 2 and the aligning rings 5 ​​of each second frame 3 are coaxially and parallelly connected by the frame connecting screws 4.

[0099] Specifically, first, adjust each fixing screw 15 on the first coupling ring 13 to drive each fixing screw 15 to move away from the outside of the pipe 1 on the corresponding first fixing block 14 (i.e., rotate all the fixing screws 15 so that all the coaxial abutment heads 10 are away from the center of the coupling ring 13). Then, insert the end of the first pipe 1 into the coupling ring 13. Then, rotate all the fixing screws 15 so that all the fixing screws 15 move towards the axis of the pipe 1, i.e., drive all the coaxial abutment heads 10 to abut against the outside of the pipe 1. Then, rotate each fixing screw 15 so that the distance from each coaxial abutment head 10 to the center of the coupling ring 13 is the same (for example, when setting multiple fixing screws 15, multiple screws of the same length and number of threads can be selected, so that the distance from the coaxial abutment head 10 to the center of the coupling ring 13 can be judged by observing the screw feed). This adjusts the alignment of the axis of the pipe 1 and the coupling ring 13.

[0100] Then, follow the above steps to fix and adjust the second pipe 1.

[0101] Simultaneously, two second skeletons 3 are placed between two first skeletons 2, and respectively fitted onto the outer sides of the mating ends of the two pipes 1 (when adjusting the two pipes 1 to coincide with the axis of the corresponding shaft ring 13, the adjusting screws 6 in the two second skeletons 3 will not apply pressure to the mating ends of the pipes 1). Then, these four skeletons are connected in series through the skeleton connecting screws 4. This completes the rapid connection of the pipes 1.

[0102] When connecting the second frame 3, the same method as connecting the first frame 2 is used. First, adjust each adjusting screw 6 on the first mating ring 5, that is, rotate the adjusting screw 6 on each second fixing block 11 so that all the trimming heads 12 are away from the center of the mating ring 5. Then, insert the mating end of the first pipe 1 into the mating ring 5. Then, rotate each adjusting screw 6 in the opposite direction until the trimming head 12 on each adjusting screw 6 abuts against the outer wall of the mating end of the pipe 1.

[0103] When the two second frames 3 are respectively fitted onto the outer sides of the two pipes 1 at their opposite ends, the trimming head 12 on each adjusting screw 6 will abut against the corresponding pipe 1 opposite end sidewall. One or more adjusting screws 6 will contact the curved part of the opposite end sidewall. At this time, the adjusting screw 6 that is fully aligned with the curved part can be guided to move along the radial direction of the opposite ring 5, so that the curved part is pressed and trimmed by the trimming head 12. Then, for the adjusting screw 6 whose end is not aligned with the curved part, the contact between each adjusting screw 6 and the sidewall of the pipe 1 can be slightly adjusted (i.e., loosen the adjusting screw 6), so that the opposite ring 5 can rotate around the axis of the pipe 1 (or guide the opposite ring 5 to slide along the axis of the pipe 1) until the adjusting screw 6 whose trimming head 12 is not aligned with the curved part is adjusted to be aligned with the curved part. Then, the adjusting screw 6 is guided to move along the radial direction of the opposite ring 5 again, so that the curved part is trimmed.

[0104] When determining whether the mating end is circular, simply observe whether the distance from the trimming head 12 on each adjusting screw 6 to the center of the mating ring 5 is the same (i.e., rotate each adjusting screw 6 in the direction of pipe 1 to make the distance from each trimming head 12 to the center of the mating ring 5 the same). If they are the same, the mating end is circular. If they are not the same, it is necessary to control the adjusting screw 6 with the smaller feed amount to continue feeding until the distance from each trimming head 12 to the center of the mating ring 5 is the same.

[0105] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pipe welding joint auxiliary device, characterized in that: The matching auxiliary device is installed at the matching ends of the two corresponding pipes (1). The matching auxiliary device includes a first frame (2), a second frame (3) and at least two frame connecting screws (4). Each of the pipes (1) is fitted with the first skeleton (2) on the outside of the pipe body. The first skeleton (2) includes a collar (13) and multiple fixing screws (15). Along the axial direction of the pipe (1), the collar (13) of each of the first skeletons (2) is connected in series through the skeleton connecting screws (4) to achieve coaxial fixation. The coupling ring (13) is spaced out and sleeved on the outside of the pipe body of the pipe (1). The fixing screw (15) is disposed between the coupling ring (13) and the pipe (1), and each fixing screw (15) is evenly distributed along the circumference of the pipe (1). The fixing screw (15) is set radially to the pipe (1) with its own length direction as the reference, and the outer end is rotated and positioned on the shaft collar (13), and the inner end is abutted and positioned on the outside of the pipe body (1). Each of the fixed screws (15) achieves radial movement relative to the pipe (1) through the engagement of its outer end and the coupling collar (13) so that the coupling collar (13) is coaxially arranged with the pipe (1); The second skeleton (3) is fitted on the outer side of the opposite end of each of the pipes (1). The second skeleton (3) includes an opposite ring (5) and multiple adjusting screws (6). The opposite ring (5) of each of the second skeletons (3) is coaxially arranged with the opposite ring (13) of the first skeleton (2) and is radially limited by the connecting screw (4) of the skeleton. The matching ring (5) is sleeved on the outside of the matching end of the pipe (1), and the adjusting screw (6) is set between the matching ring (5) and the pipe (1), and each of the adjusting screws (6) is evenly distributed along the circumference of the pipe (1). The adjusting screw (6) is set radially to the pipe (1) with its own length direction as the reference, and its outer end is rotated and positioned on the matching ring (5), and its inner end is abutted and positioned on the outside of the matching end of the pipe (1). Each of the adjusting screws (6) achieves radial movement relative to the pipe (1) by rotating its outer end and the mating ring (5) to shape the mating end of the pipe (1); The matching ring (5) is provided with an arc-shaped groove (8), and the center of the arc corresponding to the arc-shaped groove (8) is concentric with the center of the matching ring (5). The skeleton connecting screw (4) passes through the arc-shaped sliding groove (8) to radially limit the engagement ring (5), while enabling the engagement ring (5) to move axially along the length direction of the skeleton connecting screw (4) or rotate around its own center.

2. The pipe welding butt joint auxiliary device according to claim 1, characterized in that: The first frame (2) also includes a plurality of first fixing blocks (14) fixed on the surface of the collar (13); the first fixing blocks (14) are provided with threaded holes; The fixing screw (15) is provided in a one-to-one correspondence with the first fixing block (14), and the outer end of the fixing screw (15) is rotated and positioned in the threaded hole of the first fixing block (14).

3. The pipe welding butt joint auxiliary device according to claim 1, characterized in that: The second frame (3) also includes multiple second fixing blocks (11) fixed to the side wall of the matching ring (5). The second fixing block (11) has a threaded hole; The adjusting screw (6) is provided in a one-to-one correspondence with the second fixing block (11), and the outer end of the adjusting screw (6) is rotated and positioned in the threaded hole on the second fixing block (11).

4. The pipe welding butt joint auxiliary device according to claim 1, characterized in that: The inner end of the fixing screw (15) is a coaxial abutment head (10). The inner end of the adjusting screw (6) is a trimming head (12).

5. The pipe welding butt joint auxiliary device according to claim 4, characterized in that: The trimming head (12) is conical.

6. The pipe welding butt joint auxiliary device according to claim 4, characterized in that: The coaxial abutment head (10) is a cylindrical structure with an abutment plane at the end that abuts against the outer wall of the pipe (1).

7. The pipe welding butt joint auxiliary device according to claim 1, characterized in that: Each skeleton connecting screw (4) is evenly distributed at equal angles around the axis of the pipe (1).

8. The pipe welding butt joint auxiliary device according to claim 1, characterized in that: The skeleton connecting screw (4) and the arc-shaped sliding groove (8) are fitted with a clearance.

9. The pipe welding butt joint auxiliary device according to claim 1, characterized in that: The coupling collar (13) has a through hole (7), the skeleton connecting screw (4) passes through the through hole (7), and both ends of the skeleton connecting screw (4) are fixed to the coupling collar (13) by fixing nuts (9).

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