An auxiliary butt joint device for connecting oil and gas transmission pipelines

Abstract

The application discloses an auxiliary butt joint equipment for connecting oil and gas conveying pipelines, and relates to the technical field of pipeline construction. The auxiliary butt joint equipment comprises a mounting frame, rotating seats are fixedly connected to the two sides of one end of the mounting frame, a rotating shaft is rotatably connected to the upper end of the rotating seat, a turnover arm is fixedly connected to one end of the rotating shaft, a driver for driving the rotating shaft to rotate is arranged on the rotating seat, and a telescopic arm is slidably connected in the turnover arm. The second centering clamping assembly, the centering assembly and the elbow fixing device can be used for centering operation of the pipeline elbow and the pipeline, and vice versa, and the driver can be used for adjusting the angle of the turnover arm during use, so that the included angle between the turnover arm and the mounting frame can be adjusted according to the laying angle of the pipeline during pipeline laying, and the auxiliary butt joint equipment can be suitable for butt joint of pipelines with different angles.

Description

Technical Field

[0001] This invention relates to the field of pipeline construction technology, specifically to an auxiliary docking device for connecting oil and gas transmission pipelines. Background Technology

[0002] Oil and gas pipelines are pipelines that transport natural gas (including associated gas from oil fields) from extraction sites or processing plants to urban gas distribution centers or industrial users. Also known as gas transmission pipelines, they are the primary method for transporting large quantities of natural gas over land. Natural gas pipelines account for approximately half of the world's total pipeline length. During the laying of oil and gas pipelines, auxiliary docking equipment is used to first connect two pipelines to ensure accurate connections, facilitating subsequent pipeline connections.

[0003] For example, the auxiliary device for installing heating pipes proposed in the published document CN118309842B uses a clamping mechanism to align two pipes that need to be connected, keeping them at the same center and ensuring the accuracy of the connection. However, this device can only be used when the pipes are in a straight line. In the process of pipe laying, vertical and inclined pipes are often found. For this type of pipe connection, the above device is difficult to apply.

[0004] For the stacking and arrangement of vertical and inclined pipes, the existing technology CN113275817B proposes a pipe auxiliary docking device. This device includes a support base, a lower pipe clamping assembly snapped onto the lower end of the support base, and an upper pipe clamping assembly detachably connected to the support base. This device can fix the pipes at different angles to facilitate pipe connection. However, this device can only achieve pipe fixing at different angles and cannot perform pipe alignment. Therefore, pipe alignment still needs to be done manually by workers. At the same time, during the pipe laying process, due to pipe bends and other situations, a large number of pipe bends need to be connected. However, the existing technology can only achieve auxiliary docking between pipes. There is currently no corresponding docking equipment for connecting pipe bends to pipes.

[0005] To address these issues, we have developed an auxiliary docking device for connecting oil and gas pipelines. Summary of the Invention

[0006] The purpose of this invention is to provide an auxiliary docking device for connecting oil and gas pipelines, so as to solve the problems that the prior art is inconvenient to perform centering operations on inclined pipelines and that the prior art cannot perform auxiliary docking between pipeline bends and pipelines.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An auxiliary docking device for connecting oil and gas pipelines includes an installation frame. Rotary seats are fixedly connected to both sides of one end of the installation frame. A rotating shaft is rotatably connected to the upper end of the rotating seats. A flipping arm is fixedly connected to one end of the rotating shaft. A driver is provided on the rotating seats to drive the rotating shaft to rotate. A telescopic arm is slidably connected inside the flipping arm. A second electric cylinder is provided inside the flipping arm to push the telescopic arm to slide inside the flipping arm. A fixed arm is fixedly connected to the end of the telescopic arm away from the flipping arm. A second centering clamping assembly is provided on the fixed arm to center the pipeline. A support ring is also provided between the two ends of the fixed arm. A movable plate is slidably connected inside the installation frame. Protruding rails are provided on both sides inside the installation frame. Sliding grooves that slide with the protruding rails are provided on both sides of the movable plate. A first electric cylinder for pushing the movable plate to move is installed at one end of the installation frame. A U-shaped groove frame is fixedly connected to the upper end of the movable plate. A bend retainer is provided inside the U-shaped groove frame to fix the pipeline bend. A first centering clamping assembly for fixing to the pipeline is also provided on the movable plate.

[0009] The tilting arm is also equipped with a centering assembly for aligning the pipe bend with the pipe.

[0010] As a further aspect of the present invention: the driver includes a driven gear, which is fixedly connected to one end of the rotating shaft; a worm gear reducer is installed at the lower end of the rotating seat; a first motor is installed at the input port of the worm gear reducer; and a driving gear is installed on the output shaft of the worm gear reducer, with the driving gear meshing with the driven gear.

[0011] As a further embodiment of the present invention: the second centering clamping assembly includes a connecting seat, the connecting seat being fixedly connected to the fixed arm near both ends, the connecting seats on the two fixed arms being arranged opposite to each other, a fourth electric cylinder being installed on the connecting seat, a second V-shaped plate being fixedly connected to the output end of the fourth electric cylinder, and a second limiting slide rod being slidably connected to both ends of the connecting seat, the second limiting slide rod being fixedly connected to the second V-shaped plate.

[0012] As a further embodiment of the present invention: the support ring includes an adapter block and a perforated connecting seat, the adapter block and the perforated connecting seat are respectively fixedly connected to the ends of two fixed arms, and a plurality of arc-shaped support frames are rotatably connected to the adapter block, the end of the arc-shaped support frame away from the adapter block is detachably connected to the perforated connecting seat by bolts.

[0013] As a further embodiment of the present invention: the elbow fixing device includes a circular groove block, an arc-shaped slide rail is fixedly connected to the surface of the circular groove block, the arc-shaped slide rail is slidably connected to the limiting ring groove inside the U-shaped groove frame, a partial worm gear is fixedly connected to one end surface of the circular groove block, a first worm is rotatably connected to the lower end of the U-shaped groove frame via a support, the first worm meshes with the partial worm gear, and handles are provided at both ends of the first worm. A fixed base block is fixedly connected to one end of the circular groove block, and two pipe clamping plates are provided on the side of the fixed base block away from the U-shaped groove frame. A moving component for driving the two pipe clamping plates to move synchronously is provided at the lower end of the fixed base block.

[0014] As a further aspect of the present invention, the internal notch of the circular groove is U-shaped.

[0015] As a further embodiment of the present invention: the moving component includes a bottom limiting groove, which is opened at the lower end of the fixed base block. A bidirectional screw is rotatably connected inside the bottom limiting groove. T-shaped threaded blocks are threadedly connected to the threads at both ends of the bidirectional screw. The T-shaped threaded blocks are slidably connected to the bottom limiting groove and are fixedly connected to the lower end of the clamping plate. A second motor for driving the bidirectional screw to rotate is also provided on one side of the fixed base block.

[0016] As a further embodiment of the present invention: the first centering clamping assembly includes a fixed upright plate, which is fixedly connected to both sides of one end of the movable plate. A third electric cylinder is installed on the upper end of the fixed upright plate, and a first V-shaped plate is fixedly connected to the output end of the third electric cylinder. A first limiting slide rod is fixedly connected to both ends of the first V-shaped plate, and the first limiting slide rod is slidably connected to the fixed upright plate.

[0017] As a further embodiment of the present invention: the centering assembly includes a rotating plate, which is rotatably connected to a flipping arm on one side. A hollow disk is fixedly connected to the rotating plate. A limiting plate for limiting the rotation plate is also provided on one side of the flipping arm. Several strip-shaped grooves are opened on both ends of the hollow disk. Limiting sliders are slidably connected in each of the strip-shaped grooves. A worm gear is rotatably connected inside the hollow disk. An arc-shaped groove matching the limiting slider is opened on the worm gear. The middle position of the limiting slider is cylindrical. An inclined surface is provided at the end of the limiting slider near the clamping plate. The cylindrical section of the limiting slider is slidably connected by an arc-shaped groove. A second worm is rotatably connected in the convex box at the upper end of the hollow disk. The second worm meshes with the worm gear. Rotary handles are fixedly connected to both ends of the second worm.

[0018] As a further embodiment of the present invention: the output ends of the two third electric cylinders output synchronously, the output ends of the fourth electric cylinders on the two fixed arms output synchronously, and pressure sensors are installed at the positions where the output ends of the third electric cylinders are connected to the first V-shaped plate, the positions where the output ends of the fourth electric cylinders are connected to the second V-shaped plate, and the positions where the T-shaped threaded block is connected to the clamping plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The present invention, through the provision of a second centering clamping component, a centering component, and an elbow fixing device, can perform centering operations between pipe elbows and pipes during use, and conversely, can also be used to connect pipes to pipe elbows. Furthermore, through the provision of a driver, the angle of the flipping arm can be adjusted during use, so that during the pipe laying process, the included angle between the flipping arm and the mounting frame can be adjusted accordingly according to the laying angle of the pipe, thus making it suitable for pipe connections at different angles.

[0021] 2. This invention can connect pipes to pipe elbows, connect pipes to elbows, and connect pipes in a straight line. It has a wide range of applications, so that only one connection device needs to be carried during pipeline construction, avoiding the problem of existing technologies that require carrying multiple connection devices depending on different situations. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the structure on the other side of the present invention.

[0024] Figure 3 This is a partial cross-sectional view of the tilting arm in this invention.

[0025] Figure 4 This is a schematic diagram of the driver structure in this invention.

[0026] Figure 5 This is a schematic diagram of the driven gear in this invention.

[0027] Figure 6 This is a partial structural diagram of the present invention.

[0028] Figure 7 This is a schematic diagram of the elbow fixing device in this invention.

[0029] Figure 8 This is a schematic diagram of the structure of the moving component in this invention.

[0030] Figure 9 This is a schematic diagram of the first concentric clamping assembly in this invention.

[0031] Figure 10 This is a schematic diagram of the structure of the core component in this invention.

[0032] Figure 11 This is a schematic diagram of the internal structure of the hollow disk in this invention.

[0033] Figure 12 This is a partial structural diagram of the hollow disk in this invention.

[0034] Figure 13 This is a schematic diagram of the structure of the present invention when using the centering component for centering.

[0035] Figure 14 This is a schematic diagram of the structure when the pipe and elbow of the present invention are connected.

[0036] Figure 15 This is a schematic diagram of the structure of the present invention when installing elbows at different angles.

[0037] Figure 16 This is a schematic diagram of the structure when the pipes of the present invention are connected.

[0038] Figure 17 This is a schematic diagram of the structure of the present invention when connecting pipes at elbows.

[0039] The components include: 1. Mounting frame; 2. Elbow retainer; 3. First centering clamping assembly; 4. Driver; 5. Centering assembly; 6. Second centering clamping assembly; 7. Support ring; 8. Moving plate; 9. U-shaped groove frame; 10. Rotating shaft; 11. Fixed arm; 12. Rotating seat; 13. Tilting arm; 14. First electric cylinder; 15. Telescopic arm; 16. Second electric cylinder.

[0040] 202. Circular groove block; 203. Fixed base block; 204. Arc-shaped slide rail; 205. Handle; 206. Partial worm gear; 207. First worm; 208. Moving component; 209. Tube clamping plate;

[0041] 2071. Second motor; 2072. T-shaped threaded block; 2073. Bidirectional screw; 2074. Bottom limiting groove;

[0042] 301. First limiting slide bar; 302. Third electric cylinder; 303. First V-shaped plate; 304. Fixed upright plate;

[0043] 401. Driven gear; 402. Worm gear reducer; 403. First motor; 404. Driving gear;

[0044] 501. Rotating plate; 502. Rotating handle; 503. Second worm gear; 504. Limiting slider; 505. Hollow disc; 506. Strip groove; 507. Limiting plate; 508. Arc groove; 509. Worm gear disc;

[0045] 601. Second limit slide bar; 602. Fourth electric cylinder; 603. Second V-shaped plate; 604. Connecting seat;

[0046] 701. Adapter block; 702. Arc-shaped support frame; 703. Connector with hole; 704. Quick-release bolt. Detailed Implementation

[0047] 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, and 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.

[0048] Please see Figures 1-17 In this embodiment of the invention, an auxiliary docking device for connecting oil and gas pipelines includes a mounting frame 1. Rotary seats 12 are fixedly connected to both sides of one end of the mounting frame 1. A rotating shaft 10 is rotatably connected to the upper end of each rotating seat 12. A flipping arm 13 is fixedly connected to one end of the rotating shaft 10. A driver 4 for driving the rotating shaft 10 to rotate is provided on the rotating seat 12. The second centering clamping assembly 6 includes connecting seats 604. The connecting seats 604 are respectively fixedly connected to fixed arms 11 near both ends. The connecting seats 604 on the two fixed arms 11 are arranged opposite to each other. A fourth electric cylinder 60 is mounted on the connecting seat 604. 2. The output end of the fourth electric cylinder 602 is fixedly connected to the second V-shaped plate 603. The two ends of the connecting seat 604 are slidably connected to the second limiting slide rod 601. The second limiting slide rod 601 is fixedly connected to the second V-shaped plate 603. During operation, the first motor 403 drives the worm gear inside the worm gear reducer 402 to rotate, which in turn drives the drive gear 404 to rotate. The rotation of the drive gear 404 drives the driven gear 401, which in turn drives the rotating shaft 10 to rotate. Then, the tilting arm 13 can rotate around the rotating shaft 10 as the center, thereby adjusting the docking angle of the pipeline as needed.

[0049] A telescopic arm 15 is slidably connected inside the tilting arm 13. A second electric cylinder 16 is provided inside the tilting arm 13 to push the telescopic arm 15 to slide within the tilting arm 13. A fixed arm 11 is fixedly connected to the end of the telescopic arm 15 away from the tilting arm 13. A second centering clamping assembly 6 is provided on the fixed arm 11 for centering and clamping the pipe. The second centering clamping assembly 6 includes connecting seats 604, which are fixedly connected to the fixed arms 11 near both ends. The connecting seats 604 on the two fixed arms 11 are arranged opposite to each other. A fourth electric cylinder 602 is installed on the connecting seat 604. The output end of the fourth electric cylinder 602 is fixedly connected to a second V-shaped plate 603. The two ends of the connecting seat 604 are slidably connected to a second limiting slide rod 601. The second limiting slide rod 601 is fixedly connected to the second V-shaped plate 603. When fixing the pipe, the output ends of the fourth electric cylinders 602 on both sides move synchronously, which can drive the second V-shaped plate 603 to move synchronously. Since the inclined surface on the second V-shaped plate 603 can keep the clamped pipe in the middle position, the centering of the pipe fixation is guaranteed.

[0050] A support ring 7 is also provided between the two ends of the fixed arm 11. The support ring 7 includes a transition block 701 and a perforated connecting seat 703. The transition block 701 and the perforated connecting seat 703 are respectively fixedly connected to the ends of the two fixed arms 11. Several arc-shaped support frames 702 are rotatably connected to the transition block 701. The end of the arc-shaped support frame 702 away from the transition block 701 is detachably connected to the perforated connecting seat 703 by bolts. The arc-shaped support frames 702 can support the two fixed arms 11 and prevent the fixed arms 11 from deforming under force. At the same time, the quick-release bolts 704 can be used to connect and disconnect the arc-shaped support frames 702 and the perforated connecting seat 703, which is convenient for disassembly and assembly according to the on-site working conditions.

[0051] The mounting frame 1 is internally slidably connected to a movable plate 8. The mounting frame 1 has convex rails on both sides, and the movable plate 8 has sliding grooves on both sides that slide with the convex rails. One end of the mounting frame 1 is equipped with a first electric cylinder 14 for pushing the movable plate 8 to move. The upper end of the movable plate 8 is fixedly connected to a U-shaped groove frame 9, and the U-shaped groove frame 9 is internally equipped with a bend retainer 2 for fixing pipe bends. The position of the movable plate 8 can be adjusted during use by the first electric cylinder 14, thereby enabling centering operation when installing inclined pipes.

[0052] The elbow fixing device 2 includes a circular groove block 201. An arc-shaped slide rail 203 is fixedly connected to the surface of the circular groove block 201. The arc-shaped slide rail 203 is slidably connected to a limiting ring groove inside the U-shaped groove frame 9. A partial worm gear 205 is fixedly connected to one end of the circular groove block 201. A first worm 206 is rotatably connected to the lower end of the U-shaped groove frame 9 via a support. The first worm 206 meshes with the partial worm gear 205. Handles 204 are provided at both ends of the first worm 206. The circular groove block 201... One end of the circular slot 201 is fixedly connected to a fixed base block 202. Two clamping plates 208 are provided on the side of the fixed base block 202 away from the U-shaped slot frame 9. A moving component 207 for driving the two clamping plates 208 to move synchronously is provided at the lower end of the fixed base block 202. The internal notch of the circular slot 201 is U-shaped. The moving component 207 includes a bottom limiting groove 2074, which is located at the lower end of the fixed base block 202. A bidirectional screw 20 is rotatably connected inside the bottom limiting groove 2074. 73. T-shaped threaded blocks 2072 are threadedly connected to the threads at both ends of the bidirectional screw 2073. The T-shaped threaded blocks 2072 are slidably connected to the bottom limiting groove 2074. The T-shaped threaded blocks 2072 are fixedly connected to the lower end of the clamping plate 208. A second motor 2071 for driving the bidirectional screw 2073 to rotate is also provided on one side of the fixed bottom block 202. During operation, the required pipe elbow is placed between the two clamping plates 208 and aligned with the pipe. Then, the second motor 2071 is started. Machine 2071 drives the bidirectional screw 2073 to rotate. The rotation of the bidirectional screw 2073 can drive the two clamping plates 208 to move. The clamping plates 208 move synchronously to fix the pipe elbow. When it is necessary to adjust the elbow angle and the other outlet angle, the first worm 206 can be rotated by rotating the handle 204. The rotation of the first worm 206 can drive the local worm wheel 205 to rotate, which in turn drives the circular groove block 201 to rotate. The rotation of the circular groove block 201 drives the clamped pipe elbow to adjust the angle accordingly.

[0053] The movable plate 8 is also provided with a first centering clamping assembly 3 for fixing to the pipe; the first centering clamping assembly 3 includes a fixed upright plate 304, which is fixedly connected to both sides of one end of the movable plate 8. A third electric cylinder 302 is installed on the upper end of the fixed upright plate 304. A first V-shaped plate 303 is fixedly connected to the output end of the third electric cylinder 302. A first limiting slide rod 301 is fixedly connected to both ends of the first V-shaped plate 303. The first limiting slide rod 301 is slidably connected to the fixed upright plate 304. The output ends of the two third electric cylinders 302 output synchronously, and the output ends of the fourth electric cylinders 602 on the two fixed arms 11 output synchronously. Pressure sensors are installed at the positions where the output ends of the third electric cylinders 302 are connected to the first V-shaped plate 303, the positions where the output ends of the fourth electric cylinders 602 are connected to the second V-shaped plate 603, and the positions where the T-shaped threaded block 2072 is connected to the pipe clamping plate 208. During operation, the output ends of the two third electric cylinders 302 synchronously convey and drive the first V-shaped plate 303 to move and clamp the pipe in the center.

[0054] The tilting arm 13 is also equipped with a centering assembly 5 for centering the pipe elbow and the pipe; the centering assembly 5 includes a rotating plate 501, which is rotatably connected to the tilting arm 13 on one side. A hollow disk 505 is fixedly connected to the rotating plate 501. A limiting plate 507 for limiting the rotation plate 501 is also provided on one side of the tilting arm 13. Several strip-shaped grooves 506 are opened on both ends of the hollow disk 505. Limiting sliders 504 are slidably connected in each of the strip-shaped grooves 506. A worm gear disk 509 is rotatably connected inside the hollow disk 505. An arc-shaped groove 508 matching the limiting slider 504 is opened on the worm gear disk 509. The middle position of the limiting slider 504 is cylindrical. The end of the limiting slider 504 near the pipe clamping plate 208 is provided with an inclined surface. The cylindrical section of block 504 is slidably connected by an arc-shaped sliding groove 508. A second worm gear 503 is rotatably connected inside the convex box at the upper end of the hollow disc 505. The second worm gear 503 meshes with a worm wheel disc 509. Both ends of the second worm gear 503 are fixedly connected to a rotating handle 502. In use, the hollow disc 505 is flipped between the pipe and the elbow. Then, the pipe is brought close to the hollow disc 505. The rotating handle 502 is then rotated to drive the second worm gear 503 to rotate. The rotation of the second worm gear 503 drives the arc-shaped sliding groove 508 to rotate. The rotation of the arc-shaped sliding groove 508 drives the limiting slider 504 to move closer to each other, so that the limiting slider 504 is in contact with the surface of the pipe. Then, the pipe elbow is placed at the other end of the limiting slider 504. The limiting space formed by the limiting slider 504 is used to limit the pipe elbow, thereby facilitating the connection of the pipe elbow.

[0055] The working principle of this invention is: when connecting pipes to pipe bends, such as... Figure 13 , Figure 14 and Figure 15 As shown, the pipe is first fixed to the installed pipe using the second centering clamping assembly 6. Then, the hollow disc 505 is flipped between the pipe and the elbow. The pipe is then brought close to the hollow disc 505. Rotating the rotating assembly 502 drives the second worm gear 503 to rotate. The rotation of the second worm gear 503 drives the arc-shaped sliding groove 508 to rotate. The rotation of the arc-shaped sliding groove 508 drives the limiting sliders 504 to move closer together, making the limiting sliders 504 fit against the pipe surface. The pipe elbow is then placed at the other end of the limiting slider 504. The limiting space formed by the limiting sliders 504 limits the pipe elbow. After the position of the pipe elbow is determined, the moving assembly 2... 07 Drive the pipe clamping plate 208 to move and clamp the pipe elbow. After clamping, the second electric cylinder 16 pushes the telescopic arm 15 to move the flipping arm 13 away from the pipe, so that the pipe is removed from the restricted area formed by the limit slider 504. Then the first electric cylinder 14 pushes the moving plate 8 to move, so that the pipe elbow is removed from the restricted area formed by the limit slider 504. Then the centering component 5 is flipped to one side of the flipping arm 13. After flipping, the second electric cylinder 16 drives the flipping arm 13 to move closer to the pipe, and at the same time the first electric cylinder 14 drives the moving plate 8 to move closer to the pipe. Then the pipe elbow can be connected to the pipe. After the connection is completed, the pipe can be welded.

[0056] like Figure 17 As shown, when connecting the pipe elbow to the pipe, the first centering clamping assembly 3 is first clamped onto the already installed pipe, and the clamping plate 208 is clamped onto the already installed pipe elbow. After clamping, the pipe to be connected is placed between the second centering clamping assemblies 6 and clamped. After clamping, the driver 4 drives the flipping arm 13 to flip. After flipping to the required angle, the position of the moving plate 8 is adjusted by the first electric cylinder 14 so that the pipe can be smoothly connected to the pipe elbow.

[0057] like Figure 16 As shown, when connecting pipes, the second centering clamping assembly 6 is first fixed to the installed pipe, and then the pipe to be connected is clamped into the first centering clamping assembly 3. The flipping arm 13 and the mounting frame 1 are adjusted to be parallel, so that the center of the support ring 7 and the center of the circular groove block 201 are on the same straight line. At the same time, the pipe clamping plate 208 provides auxiliary clamping. After clamping, the second electric cylinder 16 drives the pipe clamped by the first centering clamping assembly 3 to move towards the installed pipe, thereby completing the straight connection between the pipes.

[0058] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Although this specification describes embodiments, not every embodiment contains only one technical solution. This method of description is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An auxiliary butt joining apparatus for connecting oil and gas transmission pipelines, comprising a mounting frame (1), characterized in that; Rotary seats (12) are fixedly connected to both sides of one end of the mounting frame (1). A rotating shaft (10) is rotatably connected to the upper end of the rotating seat (12). A flipping arm (13) is fixedly connected to one end of the rotating shaft (10). A driver (4) for driving the rotating shaft (10) to rotate is provided on the rotating seat (12). A telescopic arm (15) is slidably connected inside the flipping arm (13). A second electric cylinder (16) for pushing the telescopic arm (15) to slide inside the flipping arm (13) is provided inside the flipping arm (13). A fixed arm (11) is fixedly connected to the end of the telescopic arm (15) away from the flipping arm (13). A tool for guiding the pipe inlet is provided on the fixed arm (11). The second center clamping assembly (6) is centered and clamped. A support ring (7) is provided between the two ends of the fixed arm (11). A movable plate (8) is slidably connected inside the mounting frame (1). The mounting frame (1) has convex rails on both sides. The movable plate (8) has sliding grooves on both sides that slide with the convex rails. A first electric cylinder (14) for pushing the movable plate (8) to move is installed at one end of the mounting frame (1). A U-shaped groove frame (9) is fixedly connected to the upper end of the movable plate (8). A bend retainer (2) for fixing the pipe bend is provided inside the U-shaped groove frame (9). A first center clamping assembly (3) for fixing the pipe is also provided on the movable plate (8). The tilting arm (13) is also provided with a centering assembly (5) for centering the pipe elbow and the pipe. The centering assembly (5) is rotatably connected to one side of the tilting arm (13). The centering assembly (5) includes a rotating plate (501), which is rotatably connected to a flipping arm (13) on one side. A hollow disk (505) is fixedly connected to the rotating plate (501). A limiting plate (507) for limiting the rotating plate (501) is also provided on one side of the flipping arm (13). Several strip grooves (506) are opened on both ends of the hollow disk (505). Limiting sliders (504) are slidably connected in each of the strip grooves (506).

2. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 1, characterized in that, The driver (4) includes a driven gear (401) which is fixedly connected to one end of the rotating shaft (10). A worm gear reducer (402) is installed at the lower end of the rotating seat (12). A first motor (403) is installed at the input port of the worm gear reducer (402). A driving gear (404) is installed on the output shaft of the worm gear reducer (402). The driving gear (404) meshes with the driven gear (401).

3. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 1, characterized in that, The second centering clamping assembly (6) includes a connecting seat (604), which is fixedly connected to the fixed arm (11) near both ends. The connecting seats (604) on the two fixed arms (11) are arranged opposite to each other. A fourth electric cylinder (602) is installed on the connecting seat (604). A second V-shaped plate (603) is fixedly connected to the output end of the fourth electric cylinder (602). A second limiting slide rod (601) is slidably connected to both ends of the connecting seat (604). The second limiting slide rod (601) is fixedly connected to the second V-shaped plate (603).

4. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 1, characterized in that, The support ring (7) includes a transition block (701) and a perforated connecting seat (703). The transition block (701) and the perforated connecting seat (703) are respectively fixedly connected to the ends of two fixed arms (11). Several arc-shaped support frames (702) are rotatably connected to the transition block (701). The end of the arc-shaped support frame (702) away from the transition block (701) is detachably connected to the perforated connecting seat (703) with bolts.

5. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 3, characterized in that, The elbow fixing device (2) includes a circular groove block (201), and an arc-shaped slide rail (203) is fixedly connected to the surface of the circular groove block (201). The arc-shaped slide rail (203) is slidably connected to the limiting ring groove inside the U-shaped groove frame (9). A partial worm gear (205) is fixedly connected to one end of the circular groove block (201). A first worm (206) is rotatably connected to the lower end of the U-shaped groove frame (9) by means of a support. The first worm (206) meshes with the partial worm gear (205). Both ends of the first worm (206) are provided with handles (204). A fixed base block (202) is fixedly connected to one end of the circular groove block (201). Two clamping plates (208) are provided on the side of the fixed base block (202) away from the U-shaped groove frame (9). A moving component (207) for driving the two clamping plates (208) to move synchronously is provided at the lower end of the fixed base block (202).

6. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 5, characterized in that, The internal notch of the circular groove (201) is U-shaped.

7. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 6, characterized in that, The moving component (207) includes a bottom limiting groove (2074), which is located at the lower end of the fixed base block (202). A bidirectional screw (2073) is rotatably connected inside the bottom limiting groove (2074). T-shaped threaded blocks (2072) are threaded onto the threads at both ends of the bidirectional screw (2073). The T-shaped threaded blocks (2072) are slidably connected to the bottom limiting groove (2074). The T-shaped threaded blocks (2072) are fixedly connected to the lower end of the clamping plate (208). A second motor (2071) for driving the bidirectional screw (2073) to rotate is also provided on one side of the fixed base block (202).

8. The auxiliary docking equipment for connecting oil and gas pipelines according to claim 7, characterized in that, The first centering clamping assembly (3) includes a fixed upright plate (304), which is fixedly connected to both sides of one end of the movable plate (8). A third electric cylinder (302) is installed on the upper end of the fixed upright plate (304). A first V-shaped plate (303) is fixedly connected to the output end of the third electric cylinder (302). A first limiting slide rod (301) is fixedly connected to both ends of the first V-shaped plate (303). The first limiting slide rod (301) is slidably connected to the fixed upright plate (304).

9. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 1, characterized in that, The hollow disk (505) is rotatably connected to a worm gear disk (509). The worm gear disk (509) has an arc-shaped groove (508) that matches the limiting slider (504). The middle position of the limiting slider (504) is cylindrical. The end of the limiting slider (504) near the clamping plate (208) has an inclined surface. The cylindrical section of the limiting slider (504) is slidably connected by the arc-shaped groove (508). The upper end of the hollow disk (505) is rotatably connected to a second worm (503). The second worm (503) meshes with the worm gear disk (509). Both ends of the second worm (503) are fixedly connected to a rotating handle (502).

10. An auxiliary butt-joining device for connecting oil and gas pipelines according to claim 8, characterized in that, The output ends of the two third electric cylinders (302) output synchronously, and the output ends of the fourth electric cylinders (602) on the two fixed arms (11) output synchronously. Pressure sensors are installed at the positions where the output ends of the third electric cylinders (302) are connected to the first V-shaped plate (303), the output ends of the fourth electric cylinders (602) are connected to the second V-shaped plate (603), and the T-shaped threaded block (2072) is connected to the clamping plate (208).

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