A support for laying cables of new energy power station

Abstract

This invention discloses a support bracket for cable laying in new energy power plants, belonging to the field of cable laying technology. The support bracket includes a cable reel, a support rod, a laying sleeve, and a laying ring, used to guide cable laying and assist in the laying process. Mounted on the support rod, it drives the support rod to pull the cable from the cable reel. The bracket is small in size, occupies little space, is lightweight, easy to disassemble and transport, and simple to operate, requiring only one person to assemble. The sleeve slides downwards, and with the help of a limiting block, two sets of rotating blocks are limited, thus pushing the rotating blocks to rotate and pushing the pressing block towards the inner wall of the through hole, pressing its inner wall. Through the connection of the locking block and multiple sets of slots, multi-level limiting can be achieved during the outward sliding of the pressing block, allowing one model of the device to adapt to various specifications of cable reels. This gives the device advantages such as strong versatility, high compatibility, and convenient installation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of cable laying technology, and in particular to a support for cable laying in new energy power plants. Background Technology

[0002] A cable is a device used to transmit electrical energy or signals. Cables are characterized by being internally energized and externally insulated. A cable is generally composed of one or more mutually insulated conductors. These conductors are insulated from each other and are wrapped in an external insulating protective layer to complete the transmission of electrical energy. Depending on the function and the environment in which they are used, cables have various models and structures. Some cables with high strength requirements also have armored structures on the outside of the conductors to increase strength.

[0003] Chinese Patent CN118554335B, published on December 3, 2024, discloses a cable laying bracket that can replace workers in placing it in cable trenches or tunnels during cable laying. When workers pass by the device, they place the cable they are pulling on the support shaft and continue pulling forward, allowing the cable to roll smoothly and avoiding wear caused by pulling. The traction force is greatly reduced, preventing cable damage caused by excessive pulling. Multiple rollers are installed on the support shaft, so multiple sets of cables can be supported simultaneously without interference. Multiple sets of cables can be arranged neatly and then placed together on the fixed support frame, making it more convenient to use. However, this cable laying bracket is relatively large, requiring multiple people to cooperate during transportation or handling. Also, the rollers will rub against the cable sheath again during cable laying, thereby reducing the service life of the pressure regulating valve. Summary of the Invention

[0004] The purpose of this invention is to provide a support for cable laying in new energy power plants, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a support for cable laying in new energy power plants, comprising a cable roll, including a roll body, a cable wound on the roll body, a through hole opened on the roll body, a support rod, a laying sleeve and a laying ring mounted on the support rod for guiding the laying of the cable, and an auxiliary laying component mounted on the support rod for driving the support rod to pull the cable out of the cable roll.

[0006] Furthermore, the auxiliary laying component includes a positioning mechanism, a fixing mechanism, and an installation mechanism; The positioning mechanism includes a connecting column, which is installed in a through hole by a fixing mechanism. A base is fixedly connected to the outer wall of the bottom end of the connecting column. A connecting block is rotatably connected to the outer wall of the base. A push plate is rotatably connected to the outer wall of the connecting block. A connecting ring adapted to the connecting column is provided on the outer wall of the push plate. Multiple sets of V-shaped spring plates adapted to the connecting column are provided on the inner wall of the connecting ring. Multiple friction blocks are provided along the circumferential direction on the inner periphery of the connecting ring. A sliding groove adapted to the friction blocks is provided on the outer wall of the connecting column.

[0007] Furthermore, the inner diameter of the connecting ring is larger than the outer diameter of the connecting column, the open end of the V-shaped spring sheet is in contact with the outer wall of the connecting column, and there is a gap between the friction block and the sliding groove.

[0008] Furthermore, the fixing mechanism includes a sleeve slidably connected to the connecting column. Rotating blocks are rotatably connected to the outer walls of both the connecting column and the sleeve. One end of each set of rotating blocks is rotatably connected to a set of limiting blocks. A connecting spring adapted to the sleeve is provided on the outer wall of the top end of the connecting column. A locking block is slidably connected to the inner wall of the bottom end of the sleeve. A limiting spring adapted to the locking block is provided on the inner wall of the sleeve. Multiple sets of locking grooves adapted to the locking block are axially provided on the outer wall of the connecting column.

[0009] Furthermore, a connecting pipe is fixedly connected to the inner wall of the sleeve, a connecting groove adapted to the connecting pipe is opened on the inner wall of the connecting column, a connecting rod is damped connected to the inner wall of the connecting pipe, a pressing block adapted to the locking block is provided on the bottom outer wall of the connecting rod, the locking block includes a locking block body, a lower arc surface is provided on the bottom outer wall of the locking block body, an upper arc surface is provided on the top outer wall of the locking block body, and a flat surface is provided on the top outer wall of the locking block body.

[0010] Furthermore, one end of the extrusion block is slidably connected to the inner wall of the slot, and the extrusion block is located below the slot in the initial state.

[0011] Furthermore, the installation mechanism includes an installation sleeve mounted on the inner wall of the sleeve and fixedly connected to the connecting rod, and an installation block disposed on the outer wall of the bottom end of the support rod. The inner wall of the installation sleeve is provided with a rotating ring adapted to the support rod, the inner wall of the rotating ring is provided with an installation groove adapted to the installation block, a ratchet is fixedly connected to the outer wall of the rotating ring, a ratchet pawl adapted to the ratchet is disposed on the outer wall of the installation sleeve, and an elastic steel strip adapted to the ratchet pawl is disposed on the outer wall of the installation sleeve.

[0012] Furthermore, the mounting sleeve is slidably connected to the sleeve, and the rotating ring is rotatably connected to the mounting sleeve via a bearing.

[0013] Furthermore, the upper and lower ends of the laying sleeve are provided with semi-circular surfaces, and both the surface of the laying sleeve and the laying ring are provided with PTFE coating.

[0014] Unlike existing technologies, the beneficial effects of this application are as follows: 1. The bracket is small in size, occupies little space, is lightweight, easy to disassemble and transport, and is simple to operate, requiring only one person to complete the assembly.

[0015] 2. By sliding the sleeve downwards and using the limiting block to limit the two sets of rotating blocks, the rotating blocks are pushed to rotate, and the extrusion block is pushed to move towards the inner wall of the through hole and extrudes its inner wall. Through the connection of the locking block and multiple sets of locking slots, multiple levels of limiting can be performed on the extrusion block during its outward sliding process, so that one model of device can be adapted to various specifications of cable mother rolls, making the device have the advantages of strong versatility, high compatibility and convenient installation and maintenance.

[0016] 3. When inserting the support rod into the rotating ring, the mounting block enters the mounting groove and rotates to complete the installation of the support rod. After the cable laying is completed, pull the support rod upward, and through the connection between the mounting block and the mounting groove, drive the rotating ring and the mounting sleeve to move upward synchronously. This causes the connecting rod to slide upward inside the connecting pipe, which pushes the pressing block to press the locking block and contact the limit of the sleeve. Then, under the action of the connecting spring, the sleeve can be pushed to reset and the limit block can be released from pressing the through hole.

[0017] 4. If the connecting post is not installed vertically downwards from the center of the through hole, the connecting ring will tilt, causing the friction block to contact the inner wall of the slide groove and generate friction. This increases the axial sliding force of the connecting ring. This serves as a reminder to the operator that the connecting post is not inserted vertically downwards from the exact center of the through hole. Therefore, it is crucial to ensure that the connecting post is centered in the through hole during installation. This ensures that multiple sets of limiting blocks can simultaneously contact the inner wall of the through hole, guaranteeing the stability of the fixing mechanism in limiting the sleeve and connecting post. Attached Figure Description Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the interlocking structure of the sleeve and connecting post of the present invention; Figure 3 This is a schematic diagram of the interlocking structure of the connecting block and the push plate of the present invention; Figure 4 This is a schematic diagram of the interlocking structure of the connecting pipe and the mounting sleeve of the present invention; Figure 5 This is a schematic diagram of the cooperation structure between the mounting sleeve and the connecting rod of the present invention; Figure 6 This is a schematic diagram of the card block structure of the present invention; Figure 7 This is a schematic diagram of the interaction between the rotating ring and the mounting groove of the present invention; Figure 8 This is a schematic diagram of the interlocking structure of the support rod and mounting block of the present invention; Figure 9 For the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 10 For the present invention Figure 7 Enlarged structural diagram at point B.

[0018] In the diagram: 1. Cable reel; 101. Reel body; 102. Cable; 103. Through hole; 2. Sleeve; 3. Connecting post; 4. Connecting spring; 5. Base; 6. Connecting block; 7. Push plate; 8. Connecting ring; 9. V-shaped spring plate; 10. Friction block; 11. Slide groove; 12. Rotating block; 13. Limiting block; 14. Locking block; 1401. Locking block body; 1402. Lower arc surface; 1403. Upper arc surface; 1404. Flat surface; 15. Limiting spring; 16. Locking groove; 17. Connecting pipe; 18. Connecting groove; 19. Mounting sleeve; 20. Connecting rod; 21. Pressing block; 22. Rotating ring; 23. Mounting groove; 24. Support rod; 25. Mounting block; 26. Ratchet; 27. Pad; 28. Elastic steel bar; 29. ​​Laying sleeve; 30. Laying ring. Detailed Implementation

[0019] 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.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] Example 1 Please see Figures 1-10 The present invention provides a technical solution: a support for cable laying in a new energy power station, comprising a cable roll 1, including a roll body 101, a cable 102 wound on the roll body 101, a through hole 103 opened on the roll body 101, a support rod 24, a laying sleeve 29 and a laying ring 30 mounted on the support rod 24 for guiding the laying of the cable 102, and an auxiliary laying component mounted on the support rod 24 for driving the support rod 24 to pull the cable 102 out of the cable roll 1.

[0022] The auxiliary laying components include a positioning mechanism, a fixing mechanism, and an installation mechanism. The positioning mechanism includes a connecting column 3, which is installed in the through hole 103 through the fixing mechanism. A base 5 is fixedly connected to the outer wall of the bottom end of the connecting column 3. A connecting block 6 is rotatably connected to the outer wall of the base 5. A push plate 7 is rotatably connected to the outer wall of the connecting block 6. A connecting ring 8 adapted to the connecting column 3 is provided on the outer wall of the push plate 7. Multiple sets of V-shaped spring plates 9 adapted to the connecting column 3 are provided on the inner wall of the connecting ring 8. Multiple friction blocks 10 are provided along the circumferential direction on the inner periphery of the connecting ring 8. A sliding groove 11 adapted to the friction blocks 10 is provided on the outer wall of the connecting column 3.

[0023] During use, if the connecting post 3 is inserted into the through hole 103 at an angle that is tilted or if it does not enter from the exact center of the through hole 103, the contact time between the multiple sets of connecting blocks 6 and the inner wall of the through hole 103 will be inconsistent, or the multiple sets of connecting blocks 6 will rotate at different angles on the surface of the base 5. If this occurs, the connecting ring 8 will tilt on the surface of the connecting post 3. At this time, the friction block 10 on the upwardly tilted end of the connecting ring 8 will move into the groove 11 and contact the inner wall of the groove 11, generating friction. This increases the force of the connecting ring 8 sliding axially along the surface of the connecting post 3, alerting the operator to the connection... When the connecting post 3 is not inserted vertically downward from the center of the through hole 103, but is inserted vertically downward from the center of the through hole 103, the inner wall of the through hole 103 will simultaneously squeeze multiple sets of connecting blocks 6 to rotate on the surface of the base 5. When the connecting blocks 6 rotate, they will push the connecting ring 8 upward through the push plate 7, thereby ensuring that the rotation angle of multiple sets of connecting blocks 6 is consistent. This ensures that after the connecting post 3 is inserted into the through hole 103, it can be located in the center of the through hole 103. This ensures that when the subsequent multiple sets of limiting blocks 13 move outward, they can simultaneously contact the inner wall of the through hole 103, thus ensuring the stability of the fixing mechanism in limiting the sleeve 2 and the connecting post 3.

[0024] The fixing mechanism includes a sleeve 2 that is slidably connected to the connecting column 3. Rotating blocks 12 are rotatably connected to the outer walls of both the connecting column 3 and the sleeve 2. One end of each set of rotating blocks 12 is rotatably connected to a set of limiting blocks 13. A connecting spring 4 adapted to the sleeve 2 is provided on the top outer wall of the connecting column 3. A locking block 14 is slidably connected to the bottom inner wall of the sleeve 2. A limiting spring 15 adapted to the locking block 14 is provided on the inner wall of the sleeve 2. Multiple sets of locking grooves 16 adapted to the locking blocks 14 are axially provided on the outer wall of the connecting column 3.

[0025] In use, after inserting the connecting post 3 into the through hole 103, press the sleeve 2 so that it slides downward on the surface of the connecting post 3 and presses the connecting spring 4. When the sleeve 2 moves downward, it pushes the two sets of rotating blocks 12 to squeeze the compression block 12, and cooperates with the limiting block 13 to limit the two sets of rotating blocks 12, thereby pushing the rotating blocks 12 to rotate towards the inner wall of the through hole 103. During this process, through the rotation of the two sets of rotating blocks 12, the compression block 13 is pushed upward towards the inner wall of the through hole 103 and squeezes the inner wall of the cable roll 1. When the limiting spring 15 is subjected to force, it pushes the locking block 14 out of the sleeve 2 and engages with the locking groove 16, thereby limiting the sleeve 2 and ensuring the stability of limiting the sleeve 2 and the connecting column 3 when passing through the inner wall of the through hole 103 by the extrusion block 13. At the same time, by setting multiple sets of locking grooves 16, multiple levels of limiting can be performed during the outward sliding of the extrusion block 13, so that one model of device can be adapted to various specifications of cable mother roll 1, making the device have the advantages of strong versatility, high compatibility and convenient installation and maintenance.

[0026] A connecting pipe 17 is fixedly connected to the inner wall of the sleeve 2. A connecting groove 18 adapted to the connecting pipe 17 is opened on the inner wall of the connecting column 3. A connecting rod 20 is damped connected to the inner wall of the connecting pipe 17. A pressing block 21 adapted to the locking block 14 is provided on the outer wall of the bottom end of the connecting rod 20. The locking block 14 includes a locking block body 1401. A lower arc surface 1402 is provided on the outer wall of the bottom end of the locking block body 1401. An upper arc surface 1403 is provided on the outer wall of the top end of the locking block body 1401. A flat surface 1404 is provided on the outer wall of the top end of the locking block body 1401.

[0027] In use, when the sleeve 2 moves downward, it pushes the lower arc surface 1402 to press against the surface of the slot 16. At this time, the reaction force of the slot 16 on the lower arc surface 1402 pushes the block body 1401 to slide into the sleeve 2 and compresses the limiting spring 15, thereby causing the block body 1401 to slide out of the slot 16. When the sleeve 2 stops moving downward, the limiting spring 15 is pushed by the force to push the upper arc surface 1403 through the slot 16, so that the flat surface 1404 enters the slot 16, thus completing the process. The paired sleeves 2 are positioned to limit the movement of the connecting pipe 17 and the connecting rod 20. Simultaneously, the sleeves 2 push the connecting pipe 17 and the connecting rod 20 downwards and into the connecting groove 18. As the connecting rod 20 slides downwards, it pushes the pressing block 21 downwards. When the sleeves 2 need to be reset and the limiting block 12 needs to release the pressure on the through hole 103, simply pull the support rod 24 upwards, causing the mounting sleeve 19 to slide upwards inside the sleeves 2. At this time, the mounting sleeve 19 will drive the pressing block 21 upwards via the connecting rod 20, causing the pressing plate 21 to press and push... The moving block 14 pushes the flat surface 1404 out of the slot 16, allowing the upper arc surface 1403 to enter the slot 16. At this time, the connecting spring 4 pushes the sleeve 2 upward under the force, thereby causing the upper arc surface 1403 to press against the slot 16. The reaction force of the slot 16 pushes the upper arc surface 1403 into the sleeve 2, thereby releasing the pressure of the limiting block 12 on the through hole 103. In conjunction with the connecting spring 4, the sleeve 2 is pushed back to its original position. When the sleeve 2 slides upward, it will drive the connecting pipe 17 to move synchronously. Sliding upwards, the connecting rod 20 moves upwards synchronously due to the damping between the connecting tube 17 and the connecting tube 17, keeping the pressing block 21 on the same horizontal line as the locking block 14. When the sleeve 2 returns to the initial position, the connecting rod 20 is prevented from moving upwards by the limiting of the pressing block 21 by the inner wall of the top of the connecting groove 18. In conjunction with the upward sliding of the connecting tube 17, the bottom end of the connecting rod 20 slides out of the connecting tube 17, allowing the pressing block 21 to return to the position below the locking block 14.

[0028] The mounting mechanism includes a mounting sleeve 19 installed on the inner wall of the sleeve 2 and fixedly connected to the connecting rod 20, and a mounting block 25 provided on the outer wall of the bottom end of the support rod 24. A rotating ring 22 adapted to the support rod 24 is provided on the inner wall of the mounting sleeve 19. A mounting groove 23 adapted to the mounting block 25 is provided on the inner wall of the rotating ring 22. A ratchet 26 is fixedly connected to the outer wall of the rotating ring 22. A pawl 27 adapted to the ratchet 26 is provided on the outer wall of the mounting sleeve 19. An elastic steel strip 28 adapted to the pawl 27 is provided on the outer wall of the mounting sleeve 19.

[0029] In use, first insert the support rod 24 into the rotating ring 22, allowing the mounting block 25 to enter the mounting groove 23. This process involves sliding the mounting block 25 from point a into point b of the mounting groove 23, then rotating the support rod 24 counterclockwise, causing the mounting block 25 to rotate synchronously, moving it from point b to point c. At this point, the ratchet pawl 27 limits the ratchet 26, preventing the rotating ring 22 from rotating counterclockwise, thus ensuring the mounting block 25 can smoothly move from point b to point c. Finally, press the support rod 24 to push the mounting block 25 to point d, completing the installation of the support rod 24. Next, remove one end of the cable 102 from the surface of the mother roll body 101 and pass it through the laying sleeve 29 and the laying ring 30. Then, pull the cable 102 using an external take-up machine. At one end, the cable 102 applies tension to the surfaces of the laying sleeve 29 and the laying ring 30, thereby driving the support rod 24 to rotate on the surface of the mounting sleeve 19 via the rotating ring 22. At this time, the rotating ring 22 will drive the ratchet 26 to rotate synchronously and push the pawl 27 to rotate and apply a thrust to the surface of the elastic steel strip 28. The rotation of the support rod 24 assists in the cable laying work, so that the mother roll body 101 can remain stationary. When the support rod 24 is pulled upward, the mounting block 25 moves from point d to point c. Then, the support rod 24 is pulled upward, and the connection between the mounting block 25 and the mounting groove 23 drives the rotating ring 22 and the mounting sleeve 19 to move upward synchronously, thereby driving the connecting rod 20 to slide upward inside the connecting tube 17, which can push the pressing block 21 to press the clamping block 14 and limit the sleeve 2.

[0030] The upper and lower ends of the laying sleeve 29 are provided with semi-circular surfaces, and both the surface of the laying sleeve 29 and the laying ring 30 are provided with PTFE coating.

[0031] When in use, as the cable 102 passes through the laying sleeve 34, the semi-circular surface 35 increases the contact area between the laying sleeve 34 and the cable 102. In conjunction with the PTFE coating on the surface of the laying sleeve 34 and the laying ring 44, the friction of the cable 102 during laying is reduced, preventing the friction generated during laying from damaging the cable sheath.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A support bracket for laying cables in new energy power plants, characterized in that, include: The cable mother roll (1) includes a mother roll body (101), a cable (102) wound on the mother roll body (101), and a through hole (103) opened on the mother roll body (101). Support rod (24); The laying sleeve (29) and laying ring (30) are installed on the support rod (24) to guide the laying of the cable (102); An auxiliary laying assembly is mounted on a support rod (24) for driving the support rod (24) to pull out the cable (102) from the cable reel (1).

2. The support bracket for cable laying in new energy power plants according to claim 1, characterized in that: The auxiliary laying components include a positioning mechanism, a fixing mechanism, and an installation mechanism; The positioning mechanism includes a connecting column (3), which is installed in the through hole (103) by a fixing mechanism. A base (5) is fixedly connected to the bottom outer wall of the connecting column (3). A connecting block (6) is rotatably connected to the outer wall of the base (5). A push plate (7) is rotatably connected to the outer wall of the connecting block (6). A connecting ring (8) adapted to the connecting column (3) is provided on the outer wall of the push plate (7). Multiple sets of V-shaped spring plates (9) adapted to the connecting column (3) are provided on the inner wall of the connecting ring (8). Multiple friction blocks (10) are provided along the circumferential direction on the inner periphery of the connecting ring (8). A sliding groove (11) adapted to the friction block (10) is provided on the outer wall of the connecting column (3).

3. A support bracket for cable laying in new energy power plants according to claim 2, characterized in that: The inner diameter of the connecting ring (8) is larger than the outer diameter of the connecting column (3). The open end of the V-shaped spring sheet (9) is in contact with the outer wall of the connecting column (3). There is a gap between the friction block (10) and the slide groove (11).

4. A support bracket for cable laying in new energy power plants according to claim 2, characterized in that: The fixing mechanism includes a sleeve (2) that is slidably connected to the connecting column (3). Rotating blocks (12) are rotatably connected to the outer walls of both the connecting column (3) and the sleeve (2). One end of each set of rotating blocks (12) is rotatably connected to a set of limiting blocks (13). A connecting spring (4) adapted to the sleeve (2) is provided on the outer wall of the top end of the connecting column (3). A locking block (14) is slidably connected to the inner wall of the bottom end of the sleeve (2). A limiting spring (15) adapted to the locking block (14) is provided on the inner wall of the sleeve (2). Multiple sets of locking slots (16) adapted to the locking blocks (14) are axially provided on the outer wall of the connecting column (3).

5. A support bracket for cable laying in new energy power plants according to claim 4, characterized in that: A connecting pipe (17) is fixedly connected to the inner wall of the sleeve (2). A connecting groove (18) adapted to the connecting pipe (17) is opened on the inner wall of the connecting column (3). A connecting rod (20) is damped connected to the inner wall of the connecting pipe (17). A pressing block (21) adapted to the locking block (14) is provided on the outer wall of the bottom end of the connecting rod (20). The locking block (14) includes a locking block body (1401). A lower arc surface (1402) is provided on the outer wall of the bottom end of the locking block body (1401). An upper arc surface (1403) is provided on the outer wall of the top end of the locking block body (1401). A flat surface (1404) is provided on the outer wall of the top end of the locking block body (1401).

6. A support bracket for cable laying in new energy power plants according to claim 5, characterized in that: One end of the extrusion block (21) is slidably connected to the inner wall of the slot (16), and the extrusion block (21) is located below the slot (14) in the initial state.

7. A support bracket for cable laying in new energy power plants according to claim 2, characterized in that: The installation mechanism includes an installation sleeve (19) installed on the inner wall of the sleeve (2) and fixedly connected to the connecting rod (20), and an installation block (25) provided on the outer wall of the bottom end of the support rod (24). The inner wall of the installation sleeve (19) is provided with a rotating ring (22) adapted to the support rod (24), the inner wall of the rotating ring (22) is provided with an installation groove (23) adapted to the installation block (25), a ratchet (26) is fixedly connected to the outer wall of the rotating ring (22), a pawl (27) adapted to the ratchet (26) is provided on the outer wall of the installation sleeve (19), and an elastic steel strip (28) adapted to the pawl (27) is provided on the outer wall of the installation sleeve (19).

8. A support bracket for cable laying in a new energy power station according to claim 7, characterized in that: The mounting sleeve (19) is slidably connected to the sleeve (2), and the rotating ring (22) is rotatably connected to the mounting sleeve (19) through a bearing.

9. A support bracket for cable laying in new energy power plants according to claim 1, characterized in that: The upper and lower ends of the laying sleeve (29) are provided with semi-circular surfaces, and the surfaces of the laying sleeve (29) and the laying ring (30) are both provided with PTFE coating.

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