A welding tool for a pipe wall sleeve

Abstract

The application relates to a welding tool for a pipeline wall sleeve, which comprises a first lifting frame and a second lifting frame, the first lifting frame and the second lifting frame are connected in an openable and closable mode, the pipeline wall sleeve comprises an upper protective plate and a lower protective plate, the first lifting frame is used for being connected with the upper protective plate during lifting, the second lifting frame is used for being connected with the lower protective plate during lifting, and the upper protective plate and the lower protective plate are sleeved on the outer circumferential surface of a pipeline; two groups of rotating mechanisms are connected with the first lifting frame and the second lifting frame respectively, the rotating mechanisms are configured to slide along the circumferential surface of the pipeline after the first lifting frame and the second lifting frame are closed, and the upper protective plate is located above the lower protective plate. The application has the effects of facilitating operation personnel construction and reducing safety hazards.

Description

Technical Field

[0001] This application relates to the technical field of pipe welding, and in particular to a welding fixture for pipe wall sleeves. Background Technology

[0002] Pipelines for various energy transmission, such as water supply, drainage, heating, oil, and natural gas, are typically constructed by welding together multiple large-diameter pipes. However, with age and environmental factors, the welds between these pipes are prone to aging and energy leakage, necessitating repair welding. Currently, the method for repairing these pipes involves placing two semi-circular sleeves at the old weld and then welding the sleeves to the pipe for reinforcement. However, these sleeves are large and heavy, making manual support and positioning during welding extremely difficult, resulting in complex operations and potential safety hazards for operators.

[0003] Regarding the aforementioned technologies, the inventors believe that they have drawbacks, such as the difficulty in welding and reinforcement, which can easily lead to safety hazards. Summary of the Invention

[0004] In view of this, this application provides a welding fixture for pipe wall sleeves, which assists in pipe repair and reinforcement, facilitates construction by operators, and reduces safety hazards.

[0005] The welding fixture for pipe wall sleeves provided in this application adopts the following technical solution:

[0006] A welding fixture for a pipe wall sleeve includes a first lifting frame and a second lifting frame, which are closable. The pipe wall sleeve includes an upper protective plate and a lower protective plate. The first lifting frame is used to connect with the upper protective plate during lifting, and the second lifting frame is used to connect with the lower protective plate during lifting, and the upper and lower protective plates are fitted onto the outer circumferential surface of the pipe. Two sets of rotating mechanisms are connected to the first and second lifting frames respectively. The rotating mechanisms are configured to slide along the circumferential surface of the pipe after the first and second lifting frames are closed, so that the upper protective plate is located above the lower protective plate.

[0007] By adopting the above technical solution, the upper and lower protective plates are hoisted together using the first and second hoisting frames connected to them. This allows the upper and lower protective plates to be fitted onto the pipe from both sides, providing support and positioning for the pipe wall. This eliminates the need for manual support and positioning, reducing the burden on construction workers, facilitating welding, and lowering operational difficulty. The rotating mechanism allows the upper and lower protective plates to be rotated, changing their relative position to the pipe, so that the upper protective plate is positioned above the lower protective plate before welding, which complies with relevant construction standards.

[0008] Preferably, it further includes two sets of fastening mechanisms, which are respectively connected to the first hoisting frame and the second hoisting frame. One set of fastening mechanisms is fastened to the side walls at both axial ends of the upper guard plate during hoisting, and the other set of fastening mechanisms is fastened to the side walls at both axial ends of the lower guard plate during hoisting.

[0009] By adopting the above technical solution, the upper and lower guard plates are fastened using a fastening mechanism, thereby improving the stability of the connection with the first and second lifting frames.

[0010] Preferably, the first hoisting frame includes multiple upper connecting plates, which are semi-circular in shape and arranged at intervals along the axial direction, and adjacent upper connecting plates are connected by upper connecting members; the second hoisting frame includes multiple lower connecting plates, which are semi-circular in shape and arranged at intervals along the axial direction, and adjacent lower connecting plates are connected by lower connecting members.

[0011] By adopting the above technical solution, multiple connecting plates are arranged at intervals and combined with multiple connectors to form a hollow lifting frame, which not only ensures stability but also reduces the overall weight and facilitates lifting by lifting equipment.

[0012] Preferably, it also includes two sets of safety protection mechanisms, which are respectively connected to the first hoisting frame and the second hoisting frame. Each set of safety protection mechanisms includes two safety protection components, each of which includes a safety buckle. The upper guard plate and the lower guard plate include two lifting rings, and each safety buckle is connected to one of the lifting rings.

[0013] By adopting the above technical solution, the connection between the upper guard plate and the first lifting frame and the lower guard plate and the second lifting frame is strengthened, preventing the upper guard plate from falling off the first lifting frame or the lower guard plate from falling off the second lifting frame, thus ensuring the safety of the lifting process.

[0014] Preferably, it also includes a hinge mechanism, which is connected to the first end of the first hoisting frame and the first end of the second hoisting frame. When the pipe wall sleeve is hoisted, the first hoisting frame and the second hoisting frame are flipped open by the hinge mechanism.

[0015] By adopting the above technical solution, the first and second lifting frames can be connected by a hinge mechanism and can be automatically opened during lifting, making it easy to put the upper and lower protective plates on the pipe. The lifting process does not require manual operation and is highly safe.

[0016] Preferably, it also includes a closing mechanism, which includes a connecting block, a hinge bolt, and a connecting seat. The connecting block is connected to the second end of the second lifting frame, the connecting seat is connected to the second end of the first lifting frame, one end of the hinge bolt is rotatably connected to the connecting seat, and the other end is engaged with the connecting block.

[0017] By adopting the above technical solution, the first and second lifting frames are connected and fixed by the closing mechanism after being closed, so that the pipe wall sleeve is coaxially connected with the pipe together with the lifting frame. The upper and lower protective plates are supported by the pipe, and there is no need to rely on the lifting equipment.

[0018] Preferably, each set of the rotating mechanisms includes at least two rotating components, which are located on both sides of the corresponding lifting frame. Each rotating component includes a pulley, a pulley shaft, and a pulley seat. The pulley seat is connected to the corresponding lifting frame, the pulley shaft is connected to the pulley seat, and the pulley and the pulley shaft are rotatably connected.

[0019] By adopting the above technical solution, the pulley slides by friction with the pipe surface, which allows the upper and lower protective plates to rotate around the circumference of the pipe along with the welding fixture and change their positions to meet the welding position requirements in relevant construction standards.

[0020] Preferably, the rotating assembly further includes two second adjusting screws and two bolt seats. The two bolt seats are connected to both sides of the pulley seat. The second adjusting screws are threadedly connected to the corresponding bolt seats. The distance by which the upper or lower protective plate protrudes from the corresponding lifting frame is adjusted by squeezing the side wall of the pipe sleeve.

[0021] By adopting the above technical solution, the distance between the upper or lower guard plate and the corresponding lifting frame at both ends of the axial direction can be adjusted, avoiding the situation where some parts do not protrude from the lifting frame and thus affect the welding.

[0022] Preferably, it further includes two sets of correction mechanisms, which are respectively connected to the first lifting frame and the second lifting frame. Each set of correction mechanisms includes at least four correction components. The at least four correction components are evenly distributed and symmetrically arranged in pairs along the circumference of the pipe wall sleeve. The correction components abut against the outer circumferential surface of the pipe wall sleeve to correct the roundness of the upper or lower protective plate.

[0023] By adopting the above technical solution, the roundness of the upper or lower protective plate can be corrected to better fit the outer circumferential surface of the pipeline, which is conducive to welding construction.

[0024] Preferably, the system further includes a plurality of first gap-adjusting components and a plurality of second gap-adjusting components. The plurality of first gap-adjusting components are connected to a first end and a second end of the first lifting frame and respectively abut against a first end and a second end of the lower guard plate. The plurality of second gap-adjusting components are connected to a first end and a second end of the second lifting frame and respectively abut against a first end and a second end of the upper guard plate, so as to adjust the gap between the upper guard plate and the lower guard plate.

[0025] By adopting the above technical solution, the gap between the upper guard plate and the lower guard plate can be adjusted to avoid the weld being too large or too small, which would affect the welding process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the pipe sleeve and welding fixture hoisting state provided in the embodiments of this application.

[0027] Figure 2 This is a schematic diagram of the pipe sleeve and welding fixture provided in the embodiments of this application, which are installed behind the pipe.

[0028] Figure 3 This is a schematic diagram of the welding fixture provided in the embodiments of this application after it has been assembled.

[0029] Figure 4 This is a three-dimensional schematic diagram of the welding fixture provided in the embodiments of this application.

[0030] Figure 5 This is a three-dimensional schematic diagram of the first hoisting frame provided in the embodiments of this application.

[0031] Figures 6 to 8 This is a three-dimensional schematic diagram of the welding fixture provided in the embodiments of this application from different directions.

[0032] Figure 9 This is a three-dimensional schematic diagram of the rotating component provided in the embodiments of this application.

[0033] Figure 10 This is an axial cross-sectional view of the fastening assembly provided in the embodiments of this application.

[0034] Figure 11 This is a three-dimensional schematic diagram of the welding fixture provided in the embodiments of this application from another direction.

[0035] Explanation of reference numerals in the attached drawings: 100, pipe sleeve; 101, upper protective plate; 102, lower protective plate; 103, first lifting ring; 104, second lifting ring; 200, pipe; 300, lifting sling;

[0036] 1. First hoisting frame; 11. Upper connecting plate; 111. First upper connecting plate; 112. Second upper connecting plate; 113. Third upper connecting plate; 114. Fourth upper connecting plate; 115. First hinge hole; 12. Upper connecting piece; 121. First upper connecting piece; 122. Second upper connecting piece; 123. Third upper connecting piece; 13. Hoisting plate; 14. Pin groove; 15. Second pin shaft; 151. First limiting part; 152. Limiting hole; 2. Second hoisting frame; 215. Second hinge hole; 3. Rotating mechanism; 31. Rotating assembly; 311. Pulley seat; 312. Pulley shaft; 313. Pulley; 314. First adjusting screw; 315. Bolt seat; 316. Second adjusting screw; 4. Fastening mechanism; 41. Fastening assembly; 411. Fastening seat; 412. Hook block ; 4121, Hook-shaped part; 413, First pin; 414, Fastening bolt; 5, Safety protection mechanism; 51, Safety protection component; 511, Safety plate; 512, Third pin; 513, Safety buckle; 6, Hinge mechanism; 61, First hinge component; 611, Hinge seat; 62, Second hinge component; 7, Closing mechanism; 71, First closing component; 711, Connecting block; 7111, Second limiting part; 7112, Slot; 712, Flexible bolt; 713, Connecting seat; 72, Second closing component; 8, Correction mechanism; 81, Correction component; 811, Correction seat; 812, Correction screw; 8121, Spherical head; 813, Correction sleeve; 91, First adjusting component; 911, Inclined top block; 912, Adjusting bolt; 92, Second adjusting component. Detailed Implementation

[0037] To better understand the purpose, technical solutions, and advantages of this application, it has been described and illustrated below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that this application can be implemented without these details. In some cases, to avoid obscuring various aspects of this application due to unnecessary description, well-known methods, processes, systems, components, and / or circuits already described at a higher level will not be elaborated upon. It will be apparent to those skilled in the art that various modifications can be made to the embodiments disclosed in this application, and the general principles defined in this application can be applied to other embodiments and application scenarios without departing from the principles and scope of this application. Therefore, this application is not limited to the illustrated embodiments, but conforms to the broadest scope consistent with the scope of protection claimed in this application.

[0038] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0040] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples.

[0041] This application discloses a welding fixture for pipe sleeves, which is applied to the welding and reinforcement of various energy transmission pipelines. Energy transmission pipelines are mostly large-diameter and large-size pipelines. When their original welds are aged and leaking and need to be repaired, the pipe sleeves that are compatible with them are also large-size and large-diameter pipelines, weighing 100-200 kg and having a diameter of more than 0.6 meters. It is very difficult to operate manually, so it is necessary to use a fixture to lift and position them for welding.

[0042] like Figure 1 As shown, the welding fixture for the pipe sleeve 100 includes a first lifting frame 1 and a second lifting frame 2. The first lifting frame 1 and the second lifting frame 2 are closable. The pipe sleeve 100 includes a separate upper protective plate 101 and a lower protective plate 102. The upper protective plate 101 and the lower protective plate 102 are provided with first lifting rings 103 that can be connected to the slings 300 of the lifting equipment. The first lifting frame 1 is used to connect with the upper protective plate 101 and is lifted together with the upper protective plate 101. The second lifting frame 2 is used to connect with the lower protective plate 102 and is lifted together with the lower protective plate 102. Figure 1 As shown, when the first lifting frame 1 and the second lifting frame 2 are opened, the upper protective plate 101 and the lower protective plate 102 can approach the pipe 200 from the left and right sides and be fitted onto the outer circumference of the pipe 200, covering the original aged weld seams. Both the upper protective plate 101 and the lower protective plate 102 are semi-circular thick plates, as shown... Figure 2As shown, after being fitted onto the pipe 200, the first lifting frame 1 and the second lifting frame 2 are closed, and the upper protective plate 101 and the lower protective plate 102 are circular in shape. Because relevant construction standards require that the weld seams of the pipe sleeve 100 be located on the left and right sides of the original pipe 200 cross-section, the welding fixture also includes two sets of rotating mechanisms 3. These two sets of rotating mechanisms 3 are connected to the first lifting frame 1 and the second lifting frame 2, respectively. After the first lifting frame 1 and the second lifting frame 2 are connected and closed, the rotating mechanisms 3 can slide along the circumference of the pipe 200 (at this time, the lifting cable 300 can be removed first), causing the upper protective plate 101 and the lower protective plate 102 to rotate and move relative to the pipe 200 until the upper protective plate 101 is above the lower protective plate 102, and the center lines of the upper protective plate 101 and the lower protective plate 102 are on the same vertical plane. This position meets the requirements of the relevant construction standards. At this point, the upper protective plate 101 and the lower protective plate 102 can be welded together with the original pipe 200 for reinforcement. This position also facilitates welding operations on both sides, avoiding the inconvenience caused by operations in both vertical and horizontal directions.

[0043] In this embodiment, the upper protective plate 101 and the lower protective plate 102 are connected to the first lifting frame 1 and the second lifting frame 2 and then lifted together. The upper protective plate 101 and the lower protective plate 102 are fitted from top to bottom onto the left and right sides of the pipe 200, thereby supporting and positioning the pipe wall sleeve 100. This eliminates the need for manual support and positioning, reducing the burden on construction workers, facilitating welding, and lowering the difficulty of operation. The upper protective plate 101 and the lower protective plate 102 can be rotated by the rotating mechanism 3 to change their relative position with the pipe 200, so that the upper protective plate 101 is above the lower protective plate 102 before welding. Thus, the weld between the upper protective plate 101 and the lower protective plate 102 is located on both sides of the pipe 200, which meets the relevant construction standards.

[0044] The welding fixture also includes two sets of fastening mechanisms 4, which are respectively connected to the first lifting frame 1 and the second lifting frame 2. During lifting, these mechanisms are respectively fastened to the side walls of the upper guard plate 101 and the lower guard plate 102, ensuring a stable connection between the upper guard plate 101 and the lower guard plate 102 and their corresponding lifting frames. Please refer to [reference needed]. Figure 3 and Figure 4 Each fastening mechanism 4 includes four fastening components 41. In the fastening mechanism 4 connected to the first lifting frame 1, the four fastening components 41 are symmetrically arranged in pairs on both sides of the first lifting frame 1 and spaced apart along the circumference of the first lifting frame 1. The four fastening components 41 are used to fasten the side walls at both ends of the upper guard plate 101 in the axial direction, so that it is stably connected to the first lifting frame 1. Figure 4As shown, the fastening assembly 41 includes a fastening seat 411, a hook block 412, a first pin 413, and a fastening bolt 414. The fastening seat 411 is connected to either the first upper connecting plate 111 or the fourth upper connecting plate 114. The first pin 413 is connected to the fastening seat 411. The hook block 412 is rotatably connected to the first pin 413. One end of the hook block 412 facing the center of the first lifting frame 1 has a hook-shaped part 4121 protruding from it. The hook-shaped part 4121 can hook onto the side wall of the upper guard plate 101, so that the upper guard plate... 101 is stably connected to the first lifting frame 1 to prevent the upper guard plate 101 from falling off. The end of the hook block 412 away from the hook-shaped part 4121 is threadedly connected to the fastening bolt 414. By tightening the fastening bolt 414, its bottom end can abut or separate from the outer side of the first upper connecting plate 111 or the fourth upper connecting plate 114. When abutting, the hook block 412 is fixed in position and cannot rotate. When separating, the hook block 412 can rotate along the first pin 413 so that the hook-shaped part 4121 hooks or leaves the side wall of the upper guard plate 101.

[0045] During hoisting, the first lifting ring 103 of the upper protective plate 101 can be passed through the first hoisting frame 1 and connected to the sling 300. Then, the hook block 412 in each fastening assembly 41 can be rotated so that the hook-shaped part 4121 of the multiple hook blocks 412 hooks together with the side wall of the upper protective plate 101. Then, the fastening bolts 414 are tightened to abut against the first upper connecting plate 111 or the fourth upper connecting plate 114, so that each hook block 412 is fixed and thus the upper protective plate 101 is fastened to the first hoisting frame 1. When the pipe wall sleeve welding is completed and the welding fixture needs to be removed from the upper protective plate 101, the fastening bolts 414 can be loosened so that they no longer abut against the outer side of the first upper connecting plate 111 or the fourth upper connecting plate 114. At this time, each hook block 412 can have space to flip upward and can rotate upward along the first pin shaft 413 so that the hook-shaped part 4121 leaves the side wall of the upper protective plate 101. The fastening mechanism 4 connected to the second hoisting frame 2 is set up in the same way, and will not be described in detail again.

[0046] Please refer to Figure 5This is a schematic diagram of the first lifting frame provided in an embodiment of this application. The first lifting frame 1 includes multiple semi-circular upper connecting plates 11, which are arranged at intervals along the axial direction. Adjacent upper connecting plates 11 are connected by multiple upper connecting members 12, which are evenly spaced circumferentially. In this embodiment, four upper connecting plates 11 are provided, namely a first upper connecting plate 111, a second upper connecting plate 112, a third upper connecting plate 113, and a fourth upper connecting plate 114. Three upper connecting members 12 are provided, namely a first upper connecting member 121, a second upper connecting member 122, and a third upper connecting member 123. The first upper connecting plate 111 and the second upper connecting plate 112 are connected to both ends of the first upper connecting member 121. The third upper connecting plate 113 and the fourth upper connecting plate 114 are connected to the third upper connecting member 123. The second upper connecting plate 112 and the third upper connecting plate 113 are connected to both ends of the second upper connecting member 122. The first lifting frame 1, formed by multiple upper connecting plates 11 arranged at intervals to create a hollow design, reduces weight. Multiple upper connecting pieces 12 are sequentially connected to the upper connecting plates 11, integrating them into a single unit and improving overall integrity and reliability. The multiple upper connecting plates 11 are semi-circular in shape to fit the shape of the upper protective plate 101. The second lifting frame 2 has the same structure as the first lifting frame 1 and is symmetrically arranged. It includes four semi-circular lower connecting plates, which are spaced apart axially and sequentially connected into a single unit by multiple lower connecting pieces, which are evenly spaced circumferentially.

[0047] like Figure 6 As shown, both the first lifting frame 1 and the second lifting frame 2 are provided with two lifting plates 13. Taking the two lifting plates 13 of the first lifting frame 1 as an example, the two lifting plates 13 are arranged in parallel, and their two ends are respectively connected to the two upper connecting parts 12 located in the middle. The two lifting plates 13 are provided with pin grooves 14 with openings facing the outer circumference. The first lifting rings 103 of the upper guard plate 101 and the lower guard plate 102 are located between the corresponding two lifting plates 13. The second pin 15 passes through the first lifting ring 103 and is inserted between the two pin grooves 14. The two ends of the second pin 15 are respectively provided with a first limiting part 151 and a limiting hole 152. The diameter of the first limiting part 151 is larger than the diameter of the second pin 15. The limiting hole 152 is used to insert a pin. The limiting at both ends prevents the second pin 15 from falling out of the pin groove 14 and also facilitates disassembly. The upper guard plate 101 is connected to the first lifting ring 103 by the second pin 15 and embedded between the two pin slots 14, so that the lower guard plate 102 is connected to the second lifting frame 2, which facilitates simultaneous lifting and can provide safety protection for the upper guard plate 101 to prevent it from falling off.

[0048] Please refer to Figure 7The welding fixture provided in this embodiment includes two sets of safety protection mechanisms 5, which are respectively connected to a first lifting frame 1 and a second lifting frame 2. Each set of safety protection mechanisms 5 connected to the first lifting frame 1 includes two safety protection components 51, which are located near both ends of the first lifting frame 1. Each safety protection component 51 includes a safety plate 511, a third pin 512, and a safety buckle 513. A second lifting ring 104 and a third lifting ring (not shown in the figure) are respectively provided at both ends of the upper guard plate 101 along its arc direction. The safety plate 511 is connected to a second upper connecting member 122 near the end of the upper guard plate 101. The third pin 512 is rotatably connected to the safety plate 511, and the safety buckle 513 is connected to the third pin 512. The two safety buckles 513 are respectively connected to the second lifting ring 104 and the third lifting ring of the upper guard plate 101. By connecting the safety buckles 513 to the lifting rings of the upper guard plate 101, the safety of the upper guard plate 101 during lifting is ensured. The safety protection mechanism 5 connected to the second lifting frame 2 is similarly configured and will not be described in detail. Specifically, the upper guard plate 101 and lower guard plate 102 provided in this embodiment are equipped with three lifting rings: a first lifting ring 103, a second lifting ring 104, and a third lifting ring. The second lifting ring 104 and the third lifting ring are located near the first and second ends of the corresponding lifting frame, respectively. The first lifting ring 103 is located between the second lifting ring 104 and the third lifting ring, and is biased towards the first end of the corresponding lifting frame to facilitate load distribution. The first lifting ring 103 is connected to the second pin 15 and to the sling 300. The second lifting ring 104 and the third lifting ring are connected to the corresponding safety buckles 513. All three lifting rings are connected to the corresponding lifting frame to ensure connection stability. Both the second pin 15 and the safety buckles 513 are detachable, facilitating the separation of the welding fixture from the pipe wall sleeve 100 after welding. The safety buckles 513 are also used to connect to the lifting equipment after welding to lift and move the welding fixture out of the construction site.

[0049] The welding fixture provided in this embodiment also includes a hinge mechanism 6, which is connected to the first end of the first lifting frame 1 and the first end of the second lifting frame 2. During pipe wall sleeve installation, the first lifting frame 1 and the second lifting frame 2 automatically open by flipping through the hinge mechanism 6, facilitating the placement of the upper protective plate 101 and the lower protective plate 102 onto the pipe 200. Figure 7 As shown, the hinge mechanism 6 includes a first hinge assembly 61 and a second hinge assembly 62. The first hinge assembly 61 includes a hinge seat 611 and two fourth pins (not shown in the figure). The two fourth pins are rotatably connected to the hinge seat 611 and are respectively connected to the first end of the first lifting frame 1 and the first end of the second lifting frame 2. The structure of the second hinge assembly 62 is the same as that of the first hinge assembly 61. Figure 7As shown, two hinge seats 611 are located between the first upper connecting plate 111 and the second upper connecting plate 112, and between the third upper connecting plate 113 and the fourth upper connecting plate 114, respectively. The first ends of the four upper connecting plates 11 are provided with first hinge holes 115, and the first ends of the four lower connecting plates are provided with second hinge holes 215. The first hinge holes 115 and the second hinge holes 215 are connected to the hinge seats 611 via a fourth pin, thus achieving the hinge connection between the first lifting frame 1 and the second lifting frame 2. By setting the hinge mechanism 6 at the first end of the first lifting frame 1 and the first end of the second lifting frame 2, the opening and closing of the first lifting frame 1 and the second lifting frame 2 can be achieved. This allows for automatic opening during lifting and automatic closing after lifting, fitting the upper and lower protective plates onto the pipe without manual opening or closing, making operation convenient and highly safe.

[0050] In this embodiment, the first lifting ring 103 of the upper guard plate 101 is biased towards the first end of the first lifting frame 1, and the first lifting ring 103 of the lower guard plate 102 is biased towards the first end of the second lifting frame 2. During lifting, the first lifting frame 1 and the second lifting frame 2 are opened by the tension of the sling 300, so the pipe 200 can be inserted from the opening.

[0051] Please refer to Figure 8 The welding fixture in this embodiment includes a closing mechanism 7, which includes a first closing component 71 and a second closing component 72. The first closing component 71 and the second closing component 72 are connected to two lifting frames. The first closing component 71 includes a connecting block 711, a hinge bolt 712, and a connecting seat 713. The connecting block 711 is connected to the second end of the second lifting frame 2, and the connecting seat 713 is connected to the second end of the first lifting frame 1. One end of the hinge bolt 712 is rotatably connected to the connecting seat 713, and the other end is engaged with the connecting block 711. The structure of the second closing component 72 is the same as that of the first closing component 71. The connecting block 711 has a slot 7112 with the opening facing the outer side of the circumferential surface. The slot 7112 has a second limiting part 7111 protruding from the opening away from the first lifting frame 1. The hinge bolt 712 rotates into the slot 7112 and is connected and locked to the connecting block 711 by tightening the nut, so that the first lifting frame 1 and the second lifting frame 2 can be closed. The second limiting part 7111 limits the nut and prevents the hinge bolt 712 from coming out of the slot.

[0052] Each set of rotating mechanisms 3 provided in this application includes at least two rotating components 31, such as... Figure 3 and Figure 4 As shown, in this embodiment of the application, each set of rotating mechanisms 3 includes four rotating components 31 connected to the first lifting frame 1. The four rotating components 31 are located on both sides of the first lifting frame 1 and are symmetrically arranged in pairs, and are spaced apart along the circumference of the first lifting frame 1. Figure 9As shown, the rotating assembly 31 includes a pulley seat 311, a pulley 313, and a pulley shaft 312. The pulley seat 311 is connected to the outer side of the first upper connecting plate 111 or the fourth upper connecting plate 114 and extends outward. Both ends of the pulley shaft 312 are connected to the bottom ends of two first adjusting screws 314. The two first adjusting screws 314 are threadedly connected to the pulley seat 311. The pulley 313 is coaxially sleeved on the pulley shaft 312 and is rotatably connected to the pulley shaft 312. The position of the pulley shaft 312 relative to the pulley seat 311 can be adjusted by the first adjusting screws 314, allowing the pulley 313 to move away from or towards the original pipe 200. The pulley 313 is located on the outside of the upper guard plate 101. The rotating mechanism 3 connected to the second lifting frame 2 is similarly configured and will not be described further.

[0053] After the pipe sleeve 100 is fitted onto the existing pipe 200, since it is fitted onto both sides of the pipe 200 (i.e., the upper protective plate 101 and the lower protective plate 102 are in a left-right position), welding cannot be performed directly at this time, otherwise it will not meet the relevant standards. Therefore, it is necessary to adjust the positional relationship between the upper protective plate 101 and the lower protective plate 102. This application sets up a rotating mechanism 3, which allows the pulley 313 in the rotating assembly 31 to abut against the outer circumferential surface of the existing pipe 200 through the first adjusting screw 314, and then pushes the welding fixture to rotate. The pulley 313 slides along its outer circumferential surface by friction with the existing pipe 200, assisting the rotation of the welding fixture. The upper protective plate 101 and the lower protective plate 102 rotate synchronously until their positions become vertical, with the upper protective plate 101 above the lower protective plate 102. Welding is then performed to meet the relevant construction standards.

[0054] like Figure 9 As shown, the rotating assembly 31 also includes two second adjusting screws 316 and two bolt seats 315. The two bolt seats 315 are connected to both sides of the pulley seat 311. The second adjusting screws 316 and bolt seats 315 are threadedly connected in a one-to-one correspondence. The axial direction of the second adjusting screws 316 is towards the upper guard plate 101 or the lower guard plate 102. By adjusting the connection depth between the second adjusting screws 316 and the bolt seats 315, the side wall of the upper guard plate 101 or the lower guard plate 102 can be squeezed, thereby adjusting the distance of the upper guard plate 101 or the lower guard plate 102 protruding from the corresponding lifting frame. This avoids the protrusion distance being too small, which would affect the welding, and also avoids the protrusion distance being too large or too small, which would prevent the hook block 412 of the fastening assembly 41 from successfully hooking the side wall of the upper guard plate 101 or the lower guard plate 102.

[0055] Please refer to Figure 10It also includes two sets of correction mechanisms 8, which are respectively connected to the first hoisting frame 1 and the second hoisting frame 2. Each set of correction mechanisms 8 includes at least four correction components 81. In this embodiment, each set of correction mechanisms 8 includes six correction components 81. In the correction mechanism 8 connected to the first lifting frame 1, the six correction components 81 are evenly distributed and symmetrically arranged in pairs along the circumference of the first lifting frame 1. Each correction component 81 includes a correction seat 811, a correction screw 812, and a correction sleeve 813. Three correction seats 811 are connected to the first upper connecting plate 111 and the second upper connecting plate 112, and the other three correction seats 811 are connected to the third upper connecting plate 113 and the fourth upper connecting plate 114. The correction screw 812 is threadedly connected to the corresponding correction seat 811, and the correction sleeve 813 is connected to the bottom end of the corresponding correction screw 812. The bottom end of the correction screw 812 is provided with a spherical head 8121, and the correction sleeve 813 is provided with a matching groove. The spherical head 8121 is engaged with the groove and can rotate or swing freely within the groove. During calibration, the calibration screw 812 is turned to move it towards the upper guard plate 101 until the calibration sleeve 813 abuts against the outer circumferential surface of the upper guard plate 101. After the calibration sleeve 813 abuts against the outer circumferential surface of the upper guard plate 101, the calibration screw 812 can be turned further to correct the roundness of the upper guard plate 101. At this time, the spherical head 8121 rotates in the groove, while the calibration sleeve 813 remains in contact and does not rotate, avoiding damage to the circumferential surface of the upper guard plate 101. The angle of the contact surface can be corrected by swinging the calibration screw 812. The angle between two adjacent calibration screws 812 on the same side is 65°, and the three calibration screws on the same side form three calibration points within a range of 130°, achieving uniform calibration. The roundness of the upper guard plate 101 and the lower guard plate 102 can be adjusted by setting the correction mechanism 8 to avoid deformation during the hoisting process that may affect the welding. A spherical head 8121 is set at the end of the correction screw 812, and a correction sleeve 813 is fitted on the spherical head 8121 to correct the angle of the contact surface. When the correction screw 812 pushes the pipe wall sleeve with force, the correction sleeve 813 remains stationary, which can better protect the pipe wall sleeve.

[0056] like Figure 11As shown, the welding fixture provided in this embodiment of the application further includes multiple first gap-adjusting components 91 and multiple second gap-adjusting components 92. The multiple first gap-adjusting components 91 are connected to the first end and the second end of the first lifting frame 1, and respectively abut against the first end and the second end of the lower guard plate 102. The multiple second gap-adjusting components 92 are connected to the first end and the second end of the second lifting frame 2, and respectively abut against the first end and the second end of the upper guard plate 101, so as to adjust the gap between the upper guard plate 101 and the lower guard plate 102. Taking four first gap-adjusting components 91 and four second gap-adjusting components 92 as an example, two first gap-adjusting components 91 and two second gap-adjusting components 92 are located at the first end of the first lifting frame 1 and the second lifting frame 2, that is, the hinge end. Each first adjusting assembly 91 includes a slanted top block 911 and adjusting bolts 912. Two slanted top blocks 911 are connected to the first ends of the first upper connecting plate 111 and the third upper connecting plate 113 of the first hoisting frame 1. The corresponding two adjusting bolts 912 are threadedly connected to the slanted top blocks 911 and abut against the first end of the lower guard plate 102 by adjusting the screwing depth of the slanted top blocks 911. The structure of the second adjusting assembly 92 is the same as that of the first adjusting assembly 91, but the installation position and orientation are different. The two slanted top blocks 911 of the two second adjusting assemblies 92 are connected to the first ends of the second lower connecting plate and the fourth lower connecting plate. The corresponding two adjusting bolts 912 are threadedly connected to the slanted top blocks 911 and abut against the first end of the upper guard plate 101 by adjusting the screwing depth of the slanted top blocks 911, thereby adjusting the weld size between the upper guard plate 101 and the lower guard plate 102. Similarly, the closing ends of the first hoisting frame 1 and the second hoisting frame 2 are also equipped with corresponding first and second gap adjustment components 91 and 92, which will not be described in detail here. The gap adjustment components are used to adjust the gap between the upper guard plate 101 and the lower guard plate 102 to avoid the weld being too large or too small, thus facilitating on-site welding.

[0057] The steps for auxiliary construction using the welding fixture for pipe sleeves provided in this application embodiment are as follows:

[0058] The first lifting frame 1 and the second lifting frame 2 are respectively covered on the outer circumferential surfaces of the upper guard plate 101 and the lower guard plate 102, and the second pin 15 is inserted into the first lifting ring 103 and then inserted into the pin 14. The second lifting ring 104 and the third lifting ring are respectively connected to the corresponding safety buckle 513.

[0059] Rotate each hook 412 to fasten it onto the side walls of the upper guard plate 101 and the lower guard plate 102 respectively;

[0060] The two first lifting rings 103 are connected to the ropes 300 of the lifting equipment and lifted. The first ends of the first lifting frame 1 and the second lifting frame 2 are rotated and opened along the hinge mechanism 6, so that the second ends are opened.

[0061] The lifting equipment will slide the welding fixture and pipe wall sleeve 100 from top to bottom onto the left and right sides of the pipe 200 until the first end of the first lifting frame 1 and the second lifting frame 2 contacts the pipe 200.

[0062] The second ends of the first hoisting frame 1 and the second hoisting frame 2 are closed and fixed by the closing mechanism 7, so that the upper guard plate 101 and the lower guard plate 102 form a circular shape.

[0063] Tighten each of the first adjusting screws 314 to make the pulley 313 contact the outer circumferential surface of the pipe 200, remove the lifting cable 300, push the welding fixture to make the pulley 313 slide along the outer circumferential surface of the pipe 200, and the welding fixture rotates together with the upper guard plate 101 and the lower guard plate 102 until the upper guard plate 101 is above the lower guard plate 102.

[0064] Tighten each of the calibration screws 812 to adjust the roundness of the upper guard plate 101 and the lower guard plate 102;

[0065] Tighten each of the adjusting bolts 912 to adjust the gap between the upper guard plate 101 and the lower guard plate 102;

[0066] The arc edges and ends of the upper protective plate 101 and the lower protective plate 102 are welded to the pipe in sequence.

[0067] Disconnect all connections between the first lifting frame 1 and the second lifting frame 2 and the upper protective plate 101 and the lower protective plate 102, so that the welding fixture is separated from the pipe wall sleeve 100;

[0068] Connect the safety buckles 513 of the first lifting frame 1 and the second lifting frame 2 to the ropes 300 of the lifting equipment and lift them to remove the welding fixtures.

[0069] The welding fixture provided in this application embodiment can be used as an auxiliary fixture for welding equipment such as automatic and semi-automatic electric arc and plasma arc welding machines, and can be used in conjunction with welding large-diameter pipes.

[0070] It should be understood that although the steps in the flowcharts in the accompanying drawings are shown sequentially as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise expressly stated herein, there is no strict order in which these steps are performed, and they may be performed in other orders.

[0071] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding fixture for pipe wall sleeves, characterized in that, include: The first lifting frame (1) and the second lifting frame (2) are closable and connectable. The pipe wall sleeve (100) includes an upper protective plate (101) and a lower protective plate (102). The first lifting frame (1) is used to connect with the upper protective plate (101) during lifting, and the second lifting frame (2) is used to connect with the lower protective plate (102) during lifting. The second lifting frame (2) is fitted onto the outer circumferential surface of the pipe (200) along with the upper protective plate (101) and the lower protective plate (102). Two sets of rotating mechanisms (3) are connected to the first hoisting frame (1) and the second hoisting frame (2) respectively. The rotating mechanism (3) is configured to slide along the circumferential surface of the pipe (200) after the first hoisting frame (1) and the second hoisting frame (2) are closed, so that the upper guard plate (101) is located above the lower guard plate (102). It also includes two sets of fastening mechanisms (4), which are connected to the first hoisting frame (1) and the second hoisting frame (2) respectively. One set of fastening mechanisms (4) is fastened to the side walls at both ends of the upper guard plate (101) during hoisting, and the other set of fastening mechanisms (4) is fastened to the side walls at both ends of the lower guard plate (102) during hoisting. Each set of the rotating mechanisms (3) includes at least two rotating components (31), which are located on both sides of the corresponding lifting frame. Each rotating component (31) includes a pulley (313), a pulley shaft (312), and a pulley seat (311). The pulley seat (311) is connected to the corresponding lifting frame, the pulley shaft (312) is connected to the pulley seat (311), and the pulley (313) is rotatably connected to the pulley shaft (312). The pulley shaft (312) is connected to two first adjusting screws (314). The first adjusting screws (314) cause the pulley (313) to abut against the outer circumferential surface of the pipe (200). The pulley (313) slides along its outer circumferential surface by means of friction with the pipe (200). Each fastening mechanism (4) includes four fastening components (41). The fastening components (41) include a fastening seat (411), a hook block (412), a first pin (413), and a fastening bolt (414). The hook block (412) has a hook-shaped part (4121) protruding at one end facing the center of the first lifting frame (1). The hook block (412) can rotate along the first pin (413) so that the hook-shaped part (4121) hooks or leaves the side wall of the upper guard plate (101).

2. The welding fixture for the pipe wall sleeve according to claim 1, characterized in that: The first hoisting frame (1) includes multiple upper connecting plates (11), which are semi-circular in shape and arranged at intervals along the axial direction. Adjacent upper connecting plates (11) are connected by upper connecting members (12). The second hoisting frame (2) includes multiple lower connecting plates, which are semi-circular in shape and arranged at intervals along the axial direction. Adjacent lower connecting plates are connected by lower connecting members.

3. The welding fixture for the pipe wall sleeve according to claim 1, characterized in that: It also includes two sets of safety protection mechanisms (5), which are respectively connected to the first hoisting frame (1) and the second hoisting frame (2). Each set of safety protection mechanisms (5) includes two safety protection components (51), each of the safety protection components (51) includes a safety buckle (513), the upper guard plate (101) and the lower guard plate (102) include two lifting rings, and each of the safety buckles (513) is connected to one of the lifting rings.

4. The welding fixture for the pipe wall sleeve according to claim 1, characterized in that: It also includes a hinge mechanism (6), which is connected to the first end of the first hoisting frame (1) and the first end of the second hoisting frame (2). When the pipe wall sleeve (100) is hoisted, the first hoisting frame (1) and the second hoisting frame (2) are flipped open by the hinge mechanism (6).

5. The welding fixture for the pipe wall sleeve according to claim 1, characterized in that: It also includes a closing mechanism (7), which includes a connecting block (711), a hinge bolt (712) and a connecting seat (713). The connecting block (711) is connected to the second end of the second hoisting frame (2), and the connecting seat (713) is connected to the second end of the first hoisting frame (1). One end of the hinge bolt (712) is rotatably connected to the connecting seat (713), and the other end is engaged with the connecting block (711).

6. The welding fixture for the pipe wall sleeve according to claim 1, characterized in that: The rotating assembly (31) also includes two second adjusting screws (316) and two bolt seats (315). The two bolt seats (315) are connected to both sides of the pulley seat (311). The second adjusting screws (316) are threadedly connected to the corresponding bolt seats (315). By squeezing the side wall of the pipe sleeve, the distance by which the upper guard plate (101) or lower guard plate (102) protrudes from the corresponding lifting frame is adjusted.

7. The welding fixture for the pipe wall sleeve according to claim 1, characterized in that: It also includes two sets of correction mechanisms (8), which are respectively connected to the first hoisting frame (1) and the second hoisting frame (2). Each set of correction mechanisms (8) includes at least four correction components (81). The at least four correction components (81) are evenly distributed and symmetrically arranged in pairs along the circumference of the pipe wall sleeve. The correction components (81) abut against the outer circumferential surface of the pipe wall sleeve to correct the roundness of the upper guard plate (101) or the lower guard plate (102).

8. The welding fixture for pipe wall sleeves according to any one of claims 1-7, characterized in that: It also includes a plurality of first gap-adjusting components (91) and a plurality of second gap-adjusting components (92). The plurality of first gap-adjusting components (91) are connected to the first end and the second end of the first hoisting frame (1) and respectively abut against the first end and the second end of the lower guard plate (102). The plurality of second gap-adjusting components (92) are connected to the first end and the second end of the second hoisting frame (2) and respectively abut against the first end and the second end of the upper guard plate (101) to adjust the gap between the upper guard plate (101) and the lower guard plate (102).

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