Electric arc welding equipment for steel structure pipeline

Abstract

The invention relates to the field of pipeline welding, in particular to steel structure pipeline electric arc welding equipment which comprises two clamping pieces, a limiting piece, an adapter piece and two driving pieces. The two clamping pieces are oppositely arranged, the opening ends of the two clamping pieces face the same direction, the two side ends of the two clamping pieces are connected through the two connecting pieces correspondingly, a columnar first mounting cavity is formed in each clamping piece, a through cavity is formed in the opening end of each clamping piece, and the through cavities communicate with the first mounting cavities; the side, away from the first mounting cavity, of the through cavity is wider than the side connected with the first mounting cavity. The limiting piece is inserted into one side of the clamping piece, after the limiting piece moves along the central axis of the limiting piece, the end of the limiting piece is inserted into one side of the opening end of the clamping piece, and the opening end of the clamping piece can be limited; the adapter piece is mounted above the two clamping pieces, and an electric arc welding head is mounted on the adapter piece; the two sets of driving pieces are installed on the two connecting pieces correspondingly, and the driving ends of the driving pieces are used for being attached to the surface of the pipeline in the first installation cavity.

Description

[0001] This application is a divisional application of the application filed on October 16, 2025, with application number 202511481567X and invention title "An Arc Welding Device for Steel Structure Pipelines". Technical Field

[0002] This invention relates to the field of pipeline welding, and in particular to an arc welding device for steel structure pipelines. Background Technology

[0003] In fields such as construction engineering, petrochemicals, and energy transmission, the installation quality of steel structure pipelines directly affects the safety and reliability of system operation, and the welding process, as the core link in pipeline connection, has equipment performance that is of paramount importance.

[0004] Currently, the mainstream welding method for steel structure pipelines is manual welding. Traditional manual welding equipment relies on welders using handheld welding torches to perform arc welding operations. In terms of welding quality, manual welding depends entirely on the welder's experience, and key parameters such as torch angle, movement speed, and molten pool control are difficult to quantify precisely. In terms of work efficiency, manual welding is limited by the limits of human physical capabilities, with the average effective welding time per day usually not exceeding 6 hours, and a single welder welding approximately 30-40 meters of pipeline per day. Regarding labor intensity and adaptability to the working environment, manual welders need to be exposed to arc radiation, high-temperature welding slag, and environments with excessive PM2.5 concentrations for extended periods, resulting in a higher incidence of occupational diseases. Furthermore, when facing large-diameter pipelines or three-dimensional welding scenarios with limited space, manual welders find it difficult to maintain a stable operating posture and often require the erection of complex scaffolding for assistance. Summary of the Invention

[0005] Based on this, it is necessary to provide an arc welding equipment for steel structure pipelines to address the above-mentioned technical problems. The parameters of this arc welding device can be standardized, the operation efficiency and welding quality are higher, and the adaptability to the working environment is better. When facing large-diameter pipelines or three-dimensional welding scenarios with limited space, the rotating welding device can always maintain a stable posture without the need to erect complex scaffolding for assistance.

[0006] This invention provides an arc welding device for steel structure pipelines, comprising: Two clamping members are arranged opposite each other with their opening ends facing the same direction. The two ends of the two clamping members are connected by two connectors. The clamping members have a columnar first mounting cavity inside. The opening end of the clamping members has a through cavity that communicates with the first mounting cavity. The width of the through cavity on the side away from the first mounting cavity is greater than the width on the side connected to the first mounting cavity. A limiting member is inserted into one side of the clamping member. After the limiting member moves along its own central axis, its end is inserted into one side of the opening end of the clamping member, which can limit the opening end of the clamping member. An adapter is mounted above the two clamping members, and an arc welding head is mounted on the adapter; Two sets of driving components are respectively installed on the two connecting components. The driving end of the driving component is located in the first mounting cavity and is used to fit against the pipe surface in the first mounting cavity.

[0007] In one embodiment, the clamping member includes a first bent plate, a second bent plate, and a straight plate; the first bent plate is bent into an annular shape, and the two ends of the first bent plate are not connected; one end of each of the two second bent plates is connected to the two ends of the first bent plate; the second bent plates are bent away from the ends of the first bent plates; the other end of the second bent plates is connected to the straight plate; and a limiting groove is formed at the end of the straight plate away from the second bent plates.

[0008] In one embodiment, two fixing frames are respectively provided on both sides of the first bent plate. The fixing frames are plate-shaped and their two ends are bent toward the first bent plate and connected to the first bent plate. The upper and lower end faces of the fixing frames are coaxially provided with a first insertion hole. The limiting member is inserted into the first insertion hole, and the end of the limiting member can be inserted into the limiting groove.

[0009] In one embodiment, the fixing frame is located on both sides of the upper half of the first mounting cavity, and the limiting member includes a first insert rod and a limiting head. The first insert rod is inserted into the first insertion hole, and the limiting head is located at the end of the first insert rod away from the limiting groove.

[0010] In one embodiment, the connector is provided in the form of an arc-shaped plate structure, with two first curved plates connected to each end of the connector. The two connectors are symmetrical about the central axis of the mounting cavity, and the inner surface of the connector is located on the same curved surface as the edge of the first mounting cavity.

[0011] In one embodiment, the adapter includes a cover plate, the two ends of which overlap the upper surfaces of the four fixing frames. Multiple heat dissipation grooves are provided at both ends of the upper surface of the cover plate, and an installation port is provided in the middle of the cover plate for installing and fixing an arc welding head. The arc welding head is located directly above the first mounting cavity.

[0012] In one embodiment, the adapter further includes a second insert rod; the second insert rod is disposed at the four corners of the lower surface of the cover plate, the upper end face of the fixing frame is provided with a second insertion hole, the second insert rod is inserted into the second insertion hole, the two sides of the second insert rod are provided with slots, and the second insert rod is secured with an elastic clip.

[0013] In one embodiment, the elastic clip includes a first bent rod, a second bent rod, and a straight rod; the two ends of the first bent rod bend in the same direction, the two straight rods coincide with the central axis of the two ends of the first bent rod, the straight rods are connected to the ends of the first bent rods by the second bent rods, and the two second bent rods bend to the same position.

[0014] In one embodiment, the connector has a through groove, and the driving component includes a fixed box, a rotating rod, and a rotating wheel; the fixed box has a second mounting cavity inside, and the end of the fixed box facing the connector is set as an open structure, the rotating rod is arranged laterally in the second mounting cavity, and the two ends of the rotating rod extend through to both sides of the fixed box, and the rotating wheel is sleeved on the rotating rod.

[0015] In one embodiment, the upper and lower ends of the fixing box are both designed as open structures, and each of the upper and lower ends of the fixing box is provided with a folding plate. One end of the folding plate is attached to the upper or lower end of the fixing box, and the other end of the folding plate is bent and attached to the outer surface of the connector, and is fixedly connected to the connector by fasteners.

[0016] In the above-mentioned arc welding device for steel structure pipelines, the two limiting members are first removed to prevent the ends of the limiting members from contacting the two sides of the opening end of the first bent plate. Then, the opening end is aligned with the pipeline, and pressure is applied to the first bent plate. At this time, the opening end of the first bent plate abuts against the pipeline and deforms, increasing the width of the through cavity until the pipeline passes through the through cavity and is locked in the first installation cavity. At this time, the through cavity returns to its original position. After the limiting members are inserted, the ends of the limiting members are locked in the two sides of the opening end of the first bent plate, forming a limit on the opening end of the first bent plate. This structure ensures that no matter what force is applied or in what direction, the pipeline cannot be detached from the first installation cavity. Then, the arc welding head is adjusted to a suitable position on the adapter and connected to the welding machine. Then, the drive unit is started. The drive end of the drive unit passes through the connector and is located in the first installation cavity, and is in contact with the surface of the pipeline. Therefore, it can drive the device to move around the central axis of the pipeline, thereby realizing the welding of one circle of the pipeline. The parameters of this arc welding device can be standardized, resulting in higher work efficiency and welding quality. It also has better adaptability to the working environment. When facing large-diameter pipes or three-dimensional welding scenarios with limited space, the rotating welding device can always maintain a stable posture without the need for complex scaffolding. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural schematic diagram of the arc welding device for steel structure pipelines provided by the present invention; Figure 2 A schematic diagram of the inverted structure of the arc welding device for steel pipes provided by the present invention; Figure 3 A schematic diagram of the planar structure of the arc welding device for steel structure pipelines provided by the present invention; Figure 4 This is a schematic diagram of the structure of the clamping member and the connecting member provided by the present invention; Figure 5 This is a schematic diagram of the structure of the adapter provided by the present invention; Figure 6 This is a schematic diagram of the structure of the elastic card provided by the present invention; Figure 7 A schematic diagram of the installation state structure of the driving component provided by the present invention; Figure 8 A schematic diagram of the independent state structure of the driving component provided by the present invention.

[0019] Figure label: 110. Clamping component; 111. First curved plate; 112. Second curved plate; 113. Straight plate; 1131. Limiting groove; 120. Connecting component; 121. Through groove; 130. First mounting cavity; 140. Through cavity; 200. Fixing bracket; 210. First insertion hole; 220. Second insertion hole; 300. Limiting component; 310. First insertion rod; 320. Limiting head; 400. Adapter; 410. Cover plate; 411. Heat dissipation groove; 412. Mounting port; 420. Second insertion rod; 421. Slot; 430. Elastic clip; 431. First curved rod; 432. Second curved rod; 433. Straight rod; 500. Arc welding head; 600. Driving component; 610. Fixing box; 611. Second mounting cavity; 620. Folding plate; 630. Rotating rod; 640. Rotating wheel. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The following is combined Figures 1 to 8 This invention describes an arc welding device for steel structure pipes.

[0022] like Figures 1 to 3 As shown, in one embodiment, a steel structure pipe arc welding device includes two clamping members 110, a limiting member 300, a connecting member 400, and two sets of driving members 600. The two clamping members 110 are arranged opposite each other with their open ends facing the same direction. The two ends of the two clamping members 110 are connected by two connecting members 120. A columnar first mounting cavity 130 is provided inside the clamping member 110. A through cavity 140 is formed at the open end of the clamping member 110, which communicates with the first mounting cavity 130. The width of the through cavity 140 on the side away from the first mounting cavity 130 is greater than that of the first mounting cavity 130. The width of one side of the first mounting cavity 130 is connected; the limiting member 300 is inserted into one side of the clamping member 110. After the limiting member 300 moves along its own central axis, its end is inserted into one side of the opening end of the clamping member 110, which can limit the opening end of the clamping member 110; the adapter 400 is installed above the two clamping members 110, and an arc welding head 500 is installed on the adapter 400; two sets of driving members 600 are respectively installed on the two connecting members 120. The driving end of the driving member 600 is located in the first mounting cavity 130 and is used to fit with the pipe surface in the first mounting cavity 130.

[0023] In the above-mentioned arc welding device for steel structure pipelines, the two limiting members 300 are first pulled out to prevent the ends of the limiting members 300 from contacting the two sides of the opening end of the first bending plate 111. Then, the opening end is aligned with the pipeline, and pressure is applied to the first bending plate 111. At this time, the opening end of the first bending plate 111 abuts against the pipeline and deforms, increasing the width of the through cavity 140 until the pipeline passes through the through cavity 140 and is engaged in the first mounting cavity 130. At this time, the through cavity 140 returns to its original position. After the limiting members 300 are inserted, the ends of the limiting members 300 will just engage in the first mounting cavity 130. The two sides of the opening end of the first bending plate 111 form a limit on the opening end of the first bending plate 111. This structure ensures that the pipe cannot detach from the first mounting cavity 130 regardless of the force applied or the direction of the force. Then, the arc welding head 500 is adjusted to a suitable position on the adapter 400 and connected to the welding machine. The drive unit 600 is then activated. The drive end of the drive unit 600 passes through the connector 120 and is located within the first mounting cavity 130, fitting against the pipe surface. Therefore, it can move the device around the central axis of the pipe, thereby achieving welding around the entire pipe. This arc welding device has standardized parameters, higher operating efficiency and welding quality, and better adaptability to the working environment. When facing large-diameter pipes or space-constrained three-dimensional welding scenarios, the rotating welding device can maintain a stable posture without the need for complex scaffolding.

[0024] like Figure 4 As shown, in one embodiment, the clamping member 110 includes a first bent plate 111, a second bent plate 112, and a straight plate 113; the first bent plate 111 is bent into an annular shape, and the two ends of the first bent plate 111 are not connected; one end of each of the two second bent plates 112 is connected to the two ends of the first bent plate 111, and the second bent plates 112 are bent away from the end of the first bent plate 111; the other end of the second bent plate 112 is connected to the straight plate 113, and a limiting groove 1131 is formed at the end of the straight plate 113 away from the second bent plate 112.

[0025] Specifically, the first curved plate 111, the second curved plate 112, and the straight plate 113 constitute a " The structure has a columnar first mounting cavity 130 and a trapezoidal through cavity 140. The top of the through cavity 140 is part of the arc surface of the first mounting cavity 130, and the two sides of the through cavity 140 are two symmetrically arranged arc surfaces that curve toward the center of the opening end of the clamping member 110.

[0026] The top width of the through cavity 140 is smaller than the diameter of the first mounting cavity 130, and the bottom width of the through cavity 140 is larger than the diameter of the first mounting cavity 130. The three are integrally formed and have elasticity. Therefore, when it comes into contact with the pipe surface, the second bending plate 112 will deform first. Since the straight plate 113 is located at the end of the second bending plate 112 away from the first bending plate 111, that is, the end with the largest deformation position, the limiting groove 1131 opened on the straight plate 113 can ensure the stability of the second bending plate 112 when the limiting member is inserted 300mm thick, so that the pipe is stably clamped in the first mounting cavity 130.

[0027] In one embodiment, two fixing frames 200 are respectively provided on both sides of the first bent plate 111. The fixing frames 200 are plate-shaped structures. The two ends of the fixing frames 200 are bent toward the first bent plate 111 and connected to the first bent plate 111. The upper end face and the lower end face of the fixing frame 200 are coaxially provided with a first insertion hole 210. The limiting member 300 is inserted into the first insertion hole 210, and the end of the limiting member 300 can be inserted into the limiting groove 1131.

[0028] Specifically, the two fixing brackets 200 set on the same first curved plate 111 can be regarded as a plate-like structure. This plate-like structure is horizontally overlapped on the first curved plate 111, and both ends are bent vertically downwards. After the bending extends to a certain distance, it bends towards the first curved plate 111 and finally connects to the first curved plate 111. The limiting member 300 includes a first insert rod 310 and a limiting head 320. The first insert rod 310 is inserted into the first insertion hole 210, and the limiting head 320 is located at the end of the first insert rod 310 away from the limiting groove 1131.

[0029] In one embodiment, the mounting bracket 200 is located on both sides of the upper half of the first mounting cavity 130.

[0030] Specifically, since the first curved plate 111, the second curved plate 112, and the straight plate 113 are integrally formed and have elasticity, the second curved plate 112 deforms the most when it is subjected to force and deforms. However, it also causes the end of the first curved plate 111 that contacts the second curved plate 112 to deform. In order to avoid the deformation of the first curved plate 111 from affecting the fixing frame 200, if the transverse diameter of the first mounting cavity 130 is taken as the bisector and extended, the bisector divides the first mounting cavity 130 into upper and lower parts, and the fixing frame 200 is located entirely above the bisector, effectively reducing the impact of deformation.

[0031] In one embodiment, the connector 120 is provided with an arc-shaped plate structure, and two first curved plates 111 are respectively connected to the two ends of the connector 120. The two connectors 120 are symmetrical about the central axis of the mounting cavity, and the inner surface of the connector 120 and the edge of the first mounting cavity 130 are located on the same curved surface.

[0032] Specifically, the two clamping members 110 are arranged opposite each other, with a space in the middle where they do not touch at one end. The two connecting members 120 are arranged in this space and are symmetrical about the left and right, so that the upper and lower parts of the first mounting cavity 130 are not obstructed by external objects. The upper part is directly opposite the arc welding head 500, which is used for the arc welding head 500 to directly transmit values ​​to the first mounting cavity 130 for welding the pipe. The lower part is used for the pipe to be inserted.

[0033] like Figure 5 As shown, in one embodiment, the adapter 400 includes a cover plate 410, with both ends of the cover plate 410 overlapping the upper surfaces of four fixing brackets 200. Multiple heat dissipation grooves 411 are provided at both ends of the upper surface of the cover plate 410, and an installation port 412 is provided in the middle of the cover plate 410 for installing and fixing the arc welding head 500. The arc welding head 500 is located directly above the first mounting cavity 130.

[0034] Specifically, the heat dissipation groove 411 extends to the lower surface of the cover plate 410. When the arc welding head 500 performs welding, it generates a lot of sparks, fumes and heat. The multiple heat dissipation grooves 411 at both ends of this version can effectively dissipate heat and prevent heat accumulation caused by the enclosed space. In addition, the arc welding head 500 is connected to an external welding machine, and the connection part is set with a flexible hose. Therefore, the device can rotate around the pipe to perform welding without affecting the arc welding head 500 or the welding machine.

[0035] In one embodiment, the adapter 400 further includes a second insert 420; the second insert 420 is disposed at the four corners of the lower surface of the cover plate 410, the upper end face of the fixing bracket 200 is provided with a second insertion hole 220, the second insert 420 is inserted into the second insertion hole 220, the two sides of the second insert 420 are provided with slots 421, and the second insert 420 is secured with an elastic clip 430.

[0036] Specifically, each fixing bracket 200 has two second insertion holes 220, which are spaced apart along the central axis of the first mounting cavity 130. Two second insertion rods 420 are provided at the four corners of the lower surface of the cover plate 410. The two second insertion rods 420 are inserted into the two second insertion holes 220. The slot 421 is arc-shaped and extends through both sides of the two insertion rods along the central axis of the first mounting cavity 130.

[0037] like Figure 6 As shown, in one embodiment, the elastic clip 430 includes a first bent rod 431, a second bent rod 432, and a straight rod 433; the two ends of the first bent rod 431 are bent in the same direction, the two straight rods 433 coincide with the central axis of the two ends of the first bent rod 431, and the straight rods 433 are connected to the ends of the first bent rod 431 through the second bent rods 432, and the two second bent rods 432 are bent to the same position.

[0038] Specifically, the first bent plate 111, the second bent rod 432, and the straight rod 433 are integrally formed and have elasticity. The distance between the two straight rods 433 is the same as the distance between the two slots 421 on both sides of the second insert rod 420, while the distance between the two second bent rods 432 is less than the distance between the two slots 421. During installation, the elastic clip 430 is inserted along the central axis of the first mounting cavity 130. After passing the two second insert rods 420, the second bent rod 432 will abut against the side of one second insert rod 420 away from the other, forming a snap-fit ​​fixation.

[0039] like Figure 7 and Figure 8 As shown, in one embodiment, the connector 120 has a through groove 121, and the drive member 600 includes a fixed box 610, a rotating rod 630, and a rotating wheel 640. The fixed box 610 has a second mounting cavity 611 inside, and one end of the fixed box 610 facing the connector 120 is an open structure. The rotating rod 630 is laterally disposed within the second mounting cavity 611, with both ends of the rotating rod 630 extending through to both sides of the fixed box 610. The rotating wheel 640 is sleeved on the rotating rod 630. Both the upper and lower ends of the fixed box 610 are open structures, and both the upper and lower ends of the fixed box 610 are provided with folding plates 620. One end of the folding plate 620 is attached to the upper or lower end of the fixed box 610, and the other end of the folding plate 620 is bent and attached to the outer surface of the connector 120, and is fixedly connected to the connector 120 by fasteners.

[0040] Specifically, the open end of the fixing box 610 is snapped into the through groove 121. A motor is installed inside or outside the fixing box 610. The motor is connected to the rotating rod 630 for driving the rotating wheel 640 to rotate.

[0041] It should be noted that the motor in this embodiment can be set in any position and in any way, as long as it can drive the rotating rod 630 to rotate. Therefore, no specific description will be given in this embodiment.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An electric arc welding device for steel structure pipelines, characterized in that, include: Two clamping members are arranged opposite each other with their opening ends facing the same direction. The two ends of the two clamping members are connected by two connectors. The clamping members have a columnar first mounting cavity inside. The opening end of the clamping members has a through cavity that communicates with the first mounting cavity. The width of the through cavity on the side away from the first mounting cavity is greater than the width on the side connected to the first mounting cavity. A limiting member is inserted into one side of the clamping member. After the limiting member moves along its own central axis, its end is inserted into one side of the opening end of the clamping member, which can limit the opening end of the clamping member. An adapter is mounted above the two clamping members, and an arc welding head is mounted on the adapter; Two sets of driving components are respectively installed on the two connecting components. The driving end of the driving component is located in the first mounting cavity and is used to fit against the pipe surface in the first mounting cavity. The clamping member includes a first bent plate, a second bent plate, and a straight plate; the first bent plate is bent into a ring shape, and the two ends of the first bent plate are not connected; one end of each of the two second bent plates is connected to the two ends of the first bent plate; the second bent plates are bent away from the ends of the first bent plates; the other end of the second bent plates is connected to the straight plate; a limiting groove is formed at the end of the straight plate away from the second bent plates. Two fixing frames are respectively provided on both sides of the first bent plate. The fixing frames are plate-shaped and both ends of the fixing frames are bent toward the first bent plate and connected to the first bent plate. The upper end face and the lower end face of the fixing frame are coaxially provided with a first insertion hole. The limiting member is inserted into the first insertion hole, and the end of the limiting member can be inserted into the limiting groove. The connector is arranged in an arc-shaped plate structure. The two ends of the connector are respectively connected to the two first bent plates. The two connectors are symmetrical about the central axis of the mounting cavity. The inner surface of the connector and the edge of the first mounting cavity are located on the same curved surface. The adapter includes a cover plate, the two ends of which overlap the upper surfaces of the four fixing frames. Multiple heat dissipation grooves are provided at both ends of the upper surface of the cover plate. An installation port is provided in the middle of the cover plate for installing and fixing the arc welding head. The arc welding head is located directly above the first mounting cavity.

2. The arc welding device for steel structure pipelines according to claim 1, characterized in that, The adapter also includes a second insert rod; the second insert rod is located at the four corners of the lower surface of the cover plate, the upper end face of the fixing frame is provided with a second insertion hole, the second insert rod is inserted into the second insertion hole, the two sides of the second insert rod are provided with slots, and the second insert rod is secured with an elastic clip.

3. The arc welding device for steel structure pipelines according to claim 1, characterized in that, The connector has a through groove, and the driving component includes a fixed box, a rotating rod, and a rotating wheel. The fixed box has a second mounting cavity inside, and the end of the fixed box facing the connector is set as an open structure. The rotating rod is arranged laterally in the second mounting cavity, and both ends of the rotating rod extend through to both sides of the fixed box. The rotating wheel is sleeved on the rotating rod.

4. The arc welding device for steel structure pipelines according to claim 1, characterized in that, The fixing frame is located on both sides of the upper half of the first mounting cavity. The limiting member includes a first insert rod and a limiting head. The first insert rod is inserted into the first insertion hole, and the limiting head is located at the end of the first insert rod away from the limiting groove.

5. The arc welding device for steel structure pipelines according to claim 2, characterized in that, The elastic clip includes a first bent rod, a second bent rod, and a straight rod; the two ends of the first bent rod bend in the same direction, the two straight rods coincide with the central axis of the two ends of the first bent rod, the straight rods are connected to the ends of the first bent rods through the second bent rods, and the two second bent rods bend to the same position.

6. The arc welding apparatus for steel structure pipelines according to claim 5, characterized in that, The upper and lower ends of the fixing box are both designed as open structures. Both ends of the fixing box are provided with folding plates. One end of the folding plate is attached to the upper or lower end of the fixing box, and the other end of the folding plate is bent and attached to the outer surface of the connector, and is fixedly connected to the connector by fasteners.

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