Pipeline butt joint device suitable for narrow space

Abstract

The invention relates to the technical field of pipeline butt joint, in particular to a pipeline butt joint device suitable for a narrow space, which comprises two fixed racks symmetrically arranged along the width direction of a trench, the two fixed racks are both provided with moving trolleys, and the two moving trolleys are jointly provided with a lifting reversing mechanism; the two fixed racks are jointly provided with a butt joint mechanism. The butt joint mechanism is arranged, self-adaptive contact and feedback between the butt joint rod and the inner wall of the installed underground pipe are utilized, a driving device is used for overall position fine adjustment, the deviation of the initial space position of the underground pipe is effectively compensated, and the process does not need to depend on complex early-stage manual adjustment to forcibly enable the two underground pipes to be parallel and coplanar; and the installation preparation work in a narrow space is obviously simplified, and the dependence on the site construction precision is reduced, so that the construction efficiency is improved, and the application range of the device under the non-ideal installation condition is widened.

Description

Technical Field

[0001] This application relates to the technical field of pipe connection, and in particular to a pipe connection device suitable for confined spaces. Background Technology

[0002] In modern industry and construction, pipe connections in confined spaces are a common yet challenging task. Confined spaces typically refer to spaces with small diameters or low to the ground, such as pipe rooms, inside chimneys, and maintenance areas for ships and aircraft. Such environments limit the range of operation for workers and tools, posing numerous difficulties for pipe connections.

[0003] Therefore, how to design a pipe docking device that can operate flexibly in narrow spaces has become an urgent problem to be solved. For example, patent application CN214331681U discloses a large-diameter pipe flange docking device for adjusting the docking height of two pipes with a height difference (the first pipe is lower than the second pipe). The device includes a lifting component connecting the first flange and a lifting power component connecting the second flange. The lifting power component drives the lifting component to lift the first pipe. The device is easy to install and operate, occupies little space, is suitable for operation in narrow spaces, and can improve the efficiency of large-diameter pipe flange docking.

[0004] In practical engineering applications, due to space constraints, two pipes to be connected cannot naturally be in a parallel state. Therefore, when using the aforementioned patent application, external force is required to adjust the positions of the first and second pipes so that they are parallel and in the same vertical plane. Only then can the flanges of the two pipes be reliably fixed to the connecting device, and the final pipe docking operation be carried out. This necessary preliminary adjustment process makes the overall installation preparation work more complicated and places higher demands on the accuracy and efficiency of on-site construction. The aforementioned prior art does not mention this, resulting in a limited scope of application for the device.

[0005] In addition, the first fixing seat is located on the opposite surfaces of the two flanges, which causes the first fixing seat to obstruct the fit of the two flanges during subsequent docking and affects the installation of the corresponding bolts on the flanges. Summary of the Invention

[0006] To solve the above-mentioned technical problems, this application provides a pipe docking device suitable for narrow spaces, adopting the following technical solution: A pipe docking device suitable for narrow spaces includes two fixed frames symmetrically arranged along the width of the trench. Each fixed frame is equipped with a mobile trolley, the two mobile trolleys are jointly equipped with a lifting and reversing mechanism, and the two fixed frames are jointly equipped with a docking mechanism.

[0007] The docking mechanism includes a lifting block, on which a rotating shaft is rotatably mounted. Adjusting discs are mounted at both ends of the rotating shaft. Telescopic cylinders corresponding to the adjusting discs are mounted on the lifting block via cylinder seats. A docking disc is mounted on the telescopic end of the telescopic cylinder via a connecting frame. Multiple docking rods that can slide radially are evenly arranged on the docking disc along its circumference.

[0008] The adjusting disc has multiple through-holes evenly distributed along its circumference. Each adjusting slot corresponds to a connecting rod. A retractable adjusting rod is installed in each adjusting slot. The end of the adjusting rod away from the adjusting disc is connected to the corresponding connecting rod through a fixed bracket.

[0009] The rotating shaft drives the docking rod to move radially along the docking disc via the adjusting disc, adjusting groove, and adjusting rod.

[0010] Preferably, the lifting and reversing mechanism includes a U-shaped frame with an opening facing downwards. The two vertical sections of the U-shaped frame are respectively connected to the corresponding moving trolleys. A drive cylinder is symmetrically installed at the bottom of the horizontal section of the U-shaped frame along its length. A lifting rod is installed at the telescopic end of the drive cylinder through a connecting protrusion. A connecting rope is symmetrically installed at the bottom of the lifting rod along its length. The two connecting ropes at the same end of the lifting rod are jointly installed with a lifting belt.

[0011] Preferably, a U-shaped plate with an opening facing downwards is provided above the fixed frame. The two vertical sections of the U-shaped plate are respectively connected to the two fixed frames. A lifting cylinder is installed at the middle position of the bottom of the horizontal section of the U-shaped plate. The lifting block is connected to the telescopic end of the lifting cylinder.

[0012] Preferably, the adjusting rod is composed of two round rods slidably joined together.

[0013] Preferably, it also includes two threaded rods, which are used to thread into the threaded holes on the flange of the underground pipe to be connected. An elastic telescopic rod is installed on the side of the threaded rod near the installed underground pipe, and an alignment rod is installed on the telescopic end of the elastic telescopic rod.

[0014] Preferably, the alignment rod is used to engage with the threaded hole on the installed underground pipe flange.

[0015] Preferably, the plurality of said connecting rods can form a circular structure, and the projection of the circular structure can fall into the interior of the underground pipe.

[0016] Preferably, the connecting rod can contact the inner wall of the underground pipe during radial movement, and the reaction force generated by the contact drives the fixed frame to perform adaptive position fine adjustment.

[0017] Preferably, the two drive cylinders can drive the underground pipe to be docked, carried by the lifting belt, to rotate slightly around its axis through the opposite movement of the telescopic ends.

[0018] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention, by setting up a docking mechanism, utilizes the adaptive contact and feedback between the docking rod and the inner wall of the installed underground pipe to drive the overall device to make fine adjustments to its position, effectively compensating for the initial spatial position deviation of the underground pipe. This process does not require complex pre-installation manual adjustments to force the two underground pipes to be parallel and coplanar, significantly simplifying the installation preparation work in narrow spaces, reducing the dependence on on-site construction accuracy, thereby improving construction efficiency and broadening the applicability of the device under non-ideal installation conditions.

[0019] 2. The docking rod designed in this invention can be retracted by a telescopic cylinder after the underground pipe axis alignment is completed, and then lifted and moved out of the area between the two flanges by a lifting cylinder. This ensures that the flange end faces can be directly and unobstructed after the docking operation is completed. This completely avoids the problem of the device remaining between the flange faces and affecting the bolt installation, so that the flanges can be tightened smoothly, ensuring the continuity of the docking operation and the reliability of the final connection.

[0020] 3. This invention, through the cooperation of the lifting and reversing mechanism and the alignment rod, can drive the underground pipe to be connected to rotate back and forth slightly after the underground pipe axis is aligned, and use the alignment rod to automatically find and insert the threaded hole, so as to achieve precise alignment of the bolt holes of the two flanges, thereby improving the docking accuracy and operation speed, and making the entire underground pipe docking process smoother and more efficient. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention and its relationship with trenches, underground pipes, etc.

[0022] Figure 2 This is a three-dimensional structural diagram of the present invention and the underground pipe.

[0023] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 4 This is a three-dimensional installation structure diagram of the C-shaped plate, lifting cylinder, and lifting block of the present invention.

[0025] Figure 5 This is a three-dimensional installation structure diagram of the lifting block, adjusting disc, and docking disc of the present invention.

[0026] Figure 6 This is a three-dimensional installation structure diagram of the docking disc, docking rod, and telescopic cylinder of the present invention.

[0027] Figure 7 This is a three-dimensional installation structure diagram of the C-shaped frame, drive cylinder, and lifting belt of the present invention.

[0028] Figure 8 This is the present invention. Figure 7 A magnified view of part A.

[0029] Figure 9 This is a schematic diagram of the three-dimensional installation structure between the alignment rod and flange of the present invention.

[0030] Explanation of reference numerals in the attached drawings: 1. Fixed frame; 2. Moving trolley; 3. Lifting and reversing mechanism; 4. Docking mechanism; 5. Threaded rod; 11. C-shaped plate; 12. Lifting cylinder; 31. C-shaped frame; 32. Drive cylinder; 33. Lifting rod; 34. Connecting rope; 35. Lifting belt; 41. Lifting block; 42. Rotating shaft; 43. Adjusting disc; 44. Telescopic cylinder; 45. Docking disc; 46. Docking rod; 47. Adjusting groove; 48. Adjusting rod; 51. Elastic telescopic rod; 52. Alignment rod; 100. Underground pipe; 200. Flange; 300. Threaded hole. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1 to 9 This application will be described in further detail.

[0032] This application discloses a pipe docking device suitable for narrow spaces. Through adaptive centering, automatic lifting and posture adjustment, and precise alignment of flange threaded holes, it significantly reduces the dependence on pre-adjustment for pipe docking in narrow spaces, simplifies the installation process, and improves docking accuracy and construction efficiency.

[0033] Before using the device, the working environment needs to be clearly defined. A trench is dug in the working area and an underground pipe 100 is laid in the trench. The method of fixing one underground pipe 100 first and then connecting the next underground pipe 100 with this as a reference is adopted. A flange 200 is installed at the connection of the underground pipe 100. Threaded holes 300 are evenly opened axially on the flange 200. After the corresponding threaded holes 300 of adjacent flanges 200 are aligned, they are fixed and connected by fastening bolts.

[0034] A pipe docking device suitable for narrow spaces includes two fixed frames 1 symmetrically arranged along the width of the trench. Each fixed frame 1 is equipped with a mobile trolley 2, and the mobile trolleys 2 are jointly equipped with a lifting and reversing mechanism 3. In addition, the fixed frames 1 are also jointly equipped with a docking mechanism 4.

[0035] The docking mechanism 4 includes a lifting block 41, a rotating shaft 42 is rotatably mounted on the lifting block 41, and an adjusting disc 43 is mounted at both ends of the rotating shaft 42. A telescopic cylinder 44 corresponding to the adjusting disc 43 is mounted on the lifting block 41 through a cylinder seat. A docking disc 45 is mounted on the telescopic end of the telescopic cylinder 44 through a connecting frame. Multiple docking rods 46 that slide radially are evenly arranged on the docking disc 45 along its circumference.

[0036] Multiple through-holes 47 are evenly provided on the circumference of the adjusting disc 43, and each slot corresponds to a connecting rod 46. An adjustable rod 48 is provided inside the adjusting groove 47. The end of the adjusting rod 48 away from the adjusting disc 43 is installed on the corresponding connecting rod 46 through a fixed bracket.

[0037] A U-shaped plate 11 with an opening facing downwards is provided above the fixed frame 1. The two vertical sections of the U-shaped plate 11 are respectively installed on the two fixed frames 1. A lifting cylinder 12 is installed at the middle position of the bottom of the horizontal section of the U-shaped plate 11, and a lifting block 41 is installed on the telescopic end of the lifting cylinder 12.

[0038] The fixed frame 1 is equipped with a fixed rod for fixing the fixed frame 1 to both sides of the trench. The fixed frame 1 is placed on both sides of the trench, but it is not fixed to both sides of the trench. The U-shaped plate 11 is placed above the flange 200 of the installed underground pipe 100, so that the axis of the rotating shaft 42 is roughly the same as the axis of the installed underground pipe 100. At this time, the docking mechanism 4 is used to make the axis of the rotating shaft 42 self-align with the axis of the installed underground pipe 100, which improves the coaxiality of the underground pipe 100 to be docked and the installed underground pipe 100 in the subsequent docking mechanism 4, and avoids the deviation between the installed underground pipe 100 and the underground pipe 100 to be docked.

[0039] In specific operation, the lifting cylinder 12 is activated. The extension end of the lifting cylinder 12 drives the lifting block 41 to move down. During the downward movement of the lifting block 41, the docking rod 46 moves down synchronously. When the docking rod 46 on the corresponding side moves to the vicinity of the installed underground pipe 100, the circular projection formed by the docking rods 46 on the corresponding side falls inside the installed underground pipe 100, which prepares for the subsequent entry of the docking rod 46 on the corresponding side into the installed underground pipe 100.

[0040] The adjusting rod 48 is formed by the sliding splicing of two existing round rods. At this time, the telescopic cylinder 44 on the corresponding side is activated. The telescopic end of the telescopic cylinder 44 drives the docking disc 45 to move towards the side of the installed underground pipe 100 through the connecting frame, so that the docking rod 46 is inserted into the interior of the installed underground pipe 100. At this time, the adjusting rod 48 extends and retracts synchronously. The existing drive motor (not shown in the figure) drives the rotating shaft 42 to rotate through the belt drive. During the rotation of the rotating shaft 42, the adjusting disc 43 is driven to rotate. During the rotation of the adjusting disc 43, the adjusting rod 48 is driven to slide along the interior of the adjusting groove 47 through the adjusting groove 47. Due to the limiting of the docking rod 46 by the docking disc 45, the docking rod 46 moves radially along the docking disc 45 through the cooperation of the adjusting rod 48 and the fixed connecting frame during the rotation of the adjusting disc 43. During this process, the docking rod 46 contacts the inner wall of the installed underground pipe 100 under the action of external driving force.

[0041] When the docking rod 46 contacts the inner wall of the underground pipe 100, the extrusion force generated between them will form a counterforce and be transmitted to the entire docking mechanism 4. This counterforce can drive the fixed frame 1 to perform adaptive position fine adjustment to compensate for installation or working condition deviations. This ensures that during the subsequent docking operation of the underground pipe 100, the docking rod 46 always maintains a stable contact state with the inner wall of the installed underground pipe 100, thereby ensuring the coaxiality and accuracy of the docking of the underground pipe 100 and improving the reliability of the docking operation.

[0042] The lifting and reversing mechanism 3 includes a U-shaped frame 31 with its opening facing downwards. The two vertical sections of the U-shaped frame 31 are respectively installed on the corresponding moving trolleys 2. The bottom of the horizontal section of the U-shaped frame 31 is symmetrically equipped with a drive cylinder 32 along its length. The extension end of the drive cylinder 32 is equipped with a lifting rod 33 through a connecting protrusion. The bottom of the lifting rod 33 is symmetrically equipped with a connecting rope 34 along its length. The lifting belt 35 is installed on the connecting rope 34 at the same end of the lifting rod 33.

[0043] The lifting belt 35 is made of rubber, and the mobile trolley 2 can move on the fixed frame 1.

[0044] In actual operation, after the device self-adjusts, the fixed frame 1 is fixed on both sides of the trench by the fixed rod. At this time, the rotating shaft 42 is rotated in the opposite direction, and the adjusting disc 43 and the adjusting rod 48 cooperate to reset the docking rod 46. The lifting rod 33 is lifted by the connecting rope 34 and the lifting belt 35, and the underground pipe 100 to be docked is moved to the installed underground pipe 100 by the moving trolley 2.

[0045] Then start the drive cylinder 32. The extension end of the drive cylinder 32 works with the lifting belt 35 through the connecting rope 34 to adjust the height of the underground pipe 100 to be connected, so that the height of the underground pipe 100 to be connected is similar to that of the installed underground pipe 100. At this time, the docking rod 46 on the corresponding side is located inside the underground pipe 100 to be connected and the installed underground pipe 100, respectively.

[0046] At this time, the existing drive motor (not shown in the figure) drives the rotating shaft 42 to rotate through the belt drive. During the rotation of the rotating shaft 42, the adjusting disc 43 is driven to rotate. During the rotation of the adjusting disc 43, the adjusting rod 48 is driven to slide along the inside of the adjusting groove 47 through the adjusting groove 47. Due to the limiting of the docking disc 45 on the docking rod 46, the adjusting disc 43 rotates and the adjusting rod 48 cooperates with the fixed frame to drive the docking rod 46 to move radially along the docking disc 45. During this process, the docking rod 46 on the corresponding side is driven by the external driving force to make the underground pipe 100 to be docked and the installed underground pipe 100 coaxial.

[0047] Then, using the installed underground pipe 100 as a reference, the docking mechanism 4 makes the underground pipe 100 to be docked coaxial with the installed underground pipe 100, making the installation of the underground pipe 100 more precise. After the two underground pipes 100 are docked, the drive cylinder 32 is activated, and the lifting rod 33 and the connecting rope 34 cooperate to make the lifting belt 35 support the underground pipe 100 to be docked.

[0048] In addition, the present invention also provides two threaded rods 5, which are installed on the adjacent threaded holes 300 on the lower side of the flange 200 of the underground pipe 100 to be connected by a threaded connection. An elastic telescopic rod 51 is installed on the side of the threaded rod 5 near the underground pipe 100 that has been fixedly installed. An alignment rod 52 is installed on the telescopic end of the elastic telescopic rod 51.

[0049] In specific operations, before hoisting the underground pipe 100 to be connected, the threaded rod 5 is screwed into the corresponding threaded hole 300. When the axes of the two underground pipes 100 are aligned, the flanges 200 corresponding to the underground pipes 100 are also coaxial. At this time, the alignment rod 52 abuts against the flange 200 corresponding to the installed underground pipe 100, and the alignment rod 52 is located on the circle of the line connecting the threaded holes 300 of the corresponding flanges 200. The elastic telescopic rod 51 is compressed, and the two drive cylinders 32 are activated. The telescopic end of one drive cylinder 32 moves upward, and the telescopic end of the other drive cylinder 32 moves downward synchronously. Then, through the cooperation of the connecting rope 34 and the lifting belt 35, the underground pipe 100 to be connected is driven to rotate back and forth around its axis in a small amplitude. At this time, although the lifting belt 35 drives the underground pipe 100 to be connected to rotate back and forth, the height of the underground pipe 100 to be connected will not change.

[0050] During the reciprocating rotation of the underground pipe 100 to be connected, the threaded rod 5 and the elastic telescopic rod 51 work together to drive the alignment rod 52 to reciprocate. When the alignment rod 52 is aligned with the threaded hole 300 on the flange 200 corresponding to the installed underground pipe 100, the elastic telescopic rod 51 releases its compressive potential energy and drives the alignment rod 52 to pass through the threaded hole 300 on the flange 200 corresponding to the installed underground pipe 100. The two alignment rods 52 work together to align the threaded holes 300 on the flanges 200 corresponding to the two underground pipes 100, which facilitates the subsequent connection of the fastening bolts.

[0051] The lifting band 35 is made of rubber, which can increase the friction between the lifting band 35 and the underground pipe 100 to be connected, ensuring that the underground pipe 100 to be connected can rotate back and forth around its axis. When the alignment rod 52 is inserted into the installed underground pipe 100, the lifting band 35 and the underground pipe 100 to be connected become sliding friction.

[0052] When the two underground pipes 100 are coaxial and the threaded holes 300 of the corresponding flanges 200 are coaxial, the telescopic cylinder 44 is activated to retract the docking rod 46 through the cooperation of the connecting frame and the docking disc 45. Then, the docking mechanism 4 is lifted upward by the cooperation of the lifting cylinder 12 and the lifting block 41, so that the docking mechanism 4 moves out between the two underground pipes 100. At this time, the underground pipe 100 to be docked is moved towards the installed underground pipe 100 by the cooperation of the moving trolley 2 and the alignment rod 52, and finally fits together. It should be noted that due to the lifting of the lifting belt 35, the alignment rod 52, the elastic telescopic rod 51 and the threaded rod 5 are not subjected to vertical force during this process.

[0053] Then, the two flanges 200 are fixedly connected by tightening bolts and threaded holes 300. Finally, the threaded rod 5 is removed, and the two flanges 200 are fixedly connected by tightening bolts and threaded holes 300, thus completing the connection of the two underground pipes 100.

[0054] Working principle: First, the fixed frame 1 is placed on both sides of the trench without being fixed, so that the C-shaped plate 11 is above the flange 200 of the installed underground pipe 100, ensuring that the axis of the rotating shaft 42 is roughly aligned with the axis of the installed underground pipe 100. The lifting cylinder 12 is activated to drive the lifting block 41 to move down, so that the docking rod 46 moves down synchronously until the circular projection formed by the docking rods 46 on the corresponding side falls into the interior of the installed underground pipe 100. The telescopic cylinder 44 is activated to push the docking disc 45 to move, so that the docking rod 46 is inserted into the installed underground pipe 100. The drive motor drives the rotating shaft 42 and the adjusting disc 43 to rotate through belt transmission. With the help of the adjusting groove 47, the adjusting rod 48 and the fixed frame, the docking rod 46 moves radially and contacts the inner wall of the installed underground pipe 100. The reaction force generated drives the fixed frame 1 to fine adjust its position, so as to achieve adaptive alignment between the rotating shaft 42 and the axis of the installed underground pipe 100, ensuring the coaxiality of subsequent docking.

[0055] Next, the underground pipe 100 to be docked is moved and coaxially aligned. The frame 1 is fixed by the fixing rod, and after the docking rod 46 is reset, the lifting belt 35 and the connecting rope 34 lift the underground pipe 100 to be docked. The moving trolley 2 moves it to the vicinity of the installed underground pipe 100. The drive cylinder 32 is started to adjust the height of the underground pipe 100 to be docked to be close to that of the installed underground pipe 100, so that the docking rods 46 on both sides extend into the two underground pipes 100 respectively. The drive motor is started again to drive the rotating shaft 42 to rotate. The docking rod 46 is moved radially by the adjusting disc 43, adjusting rod 48 and other structures. With the installed underground pipe 100 as the reference, the underground pipe 100 to be docked is pushed to be aligned with the installed underground pipe 100 on the same axis. Then the drive cylinder 32 is started to let the lifting belt 35 support the underground pipe 100 to be docked.

[0056] Before hoisting, threaded rod 5 is screwed onto the threaded hole 300 of flange 200 of the underground pipe 100 to be connected. After the axes of the two underground pipes 100 are aligned, alignment rod 52 abuts against the flange 200 of the installed underground pipe 100 and is located on the circle connecting the threaded holes 300. Elastic telescopic rod 51 is compressed, activating the two drive cylinders 32 to move in opposite directions. Through connecting rope 34 and lifting belt 35, the underground pipe 100 to be connected is driven to rotate slightly back and forth around its own axis, synchronously driving alignment rod 52 to rotate. When alignment rod 52 is aligned with the threaded hole 300 of flange 200 of the installed underground pipe 100, elastic telescopic rod 51 releases potential energy to push alignment rod 52 through threaded hole 300. The two alignment rods 52 work together to achieve precise alignment of the threaded holes 300 of the two flanges 200.

[0057] After the two underground pipes 100 and flanges 200 threaded holes 300 are aligned, the docking rod 46 is retracted and the docking mechanism 4 is lifted out of the space between the two underground pipes 100 by the lifting cylinder 12. With the help of the moving trolley 2 and the alignment rod 52, the underground pipe 100 to be docked is moved to the installed underground pipe 100 until it fits. During this process, the lifting belt 35 lifts the threaded rod 5 and other components so that they are not subjected to vertical force. The two flanges 200 are fixed by fastening bolts. After the threaded rod 5 is removed, additional fastening bolts are tightened, and the docking of the two underground pipes 100 is finally completed.

[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. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pipe connection device suitable for confined spaces, characterized in that: It includes two fixed frames symmetrically arranged along the width of the trench, each fixed frame is equipped with a mobile trolley, the two mobile trolleys are jointly equipped with a lifting and reversing mechanism, and the two fixed frames are jointly equipped with a docking mechanism; The docking mechanism includes a lifting block, on which a rotating shaft is rotatably mounted. Adjusting discs are mounted at both ends of the rotating shaft. Telescopic cylinders corresponding to the adjusting discs are mounted on the lifting block via cylinder seats. The telescopic ends of the telescopic cylinders are mounted on docking discs via connecting frames. Multiple docking rods that can slide radially are evenly arranged along the circumference of the docking disc. The adjusting disc has multiple through-holes evenly distributed along its circumference. Each adjusting slot corresponds to a connecting rod. A retractable adjusting rod is installed in each adjusting slot. The end of the adjusting rod away from the adjusting disc is connected to the corresponding connecting rod through a fixed bracket. The rotating shaft drives the docking rod to move radially along the docking disc via the adjusting disc, adjusting groove, and adjusting rod.

2. The pipe docking device suitable for narrow spaces according to claim 1, characterized in that: The lifting and reversing mechanism includes a U-shaped frame with its opening facing downwards. The two vertical sections of the U-shaped frame are respectively connected to the corresponding moving trolleys. A drive cylinder is symmetrically installed at the bottom of the horizontal section of the U-shaped frame along its length. A lifting rod is installed at the telescopic end of the drive cylinder through a connecting protrusion. A connecting rope is symmetrically installed at the bottom of the lifting rod along its length. The two connecting ropes at the same end of the lifting rod are connected together to a lifting belt.

3. A pipe connection device suitable for narrow spaces according to claim 1, characterized in that: A U-shaped plate with an opening facing downwards is provided above the fixed frame. The two vertical sections of the U-shaped plate are respectively connected to the two fixed frames. A lifting cylinder is installed at the middle of the bottom of the horizontal section of the U-shaped plate. The lifting block is connected to the telescopic end of the lifting cylinder.

4. A pipe connection device suitable for narrow spaces according to claim 1, characterized in that: The adjusting rod is composed of two round rods that are slidably joined together.

5. A pipe docking device suitable for narrow spaces according to claim 1, characterized in that: It also includes two threaded rods, which are used to thread into the threaded holes on the flange of the underground pipe to be connected. An elastic telescopic rod is installed on the side of the threaded rod near the installed underground pipe, and an alignment rod is installed on the telescopic end of the elastic telescopic rod.

6. A pipe connection device suitable for confined spaces according to claim 5, characterized in that: The alignment rod is used to engage with the threaded hole on the installed underground pipe flange.

7. A pipe docking device suitable for confined spaces according to claim 1, characterized in that: Multiple connecting rods can be arranged into a circular structure, and the projection of the circular structure can fall into the interior of the underground pipe.

8. A pipe docking device suitable for narrow spaces according to claim 1, characterized in that: The connecting rod can contact the inner wall of the underground pipe during radial movement, and the reaction force generated by the contact drives the fixed frame to perform adaptive position fine adjustment.

9. A pipe docking device suitable for narrow spaces according to claim 2, characterized in that: The two drive cylinders can drive the underground pipe to be docked, which is carried by the lifting belt, to rotate back and forth slightly around its axis through the opposite movement of the telescopic ends.

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