Chain type auxiliary cable laying device

Abstract

The utility model relates to the technical field of optical cable laying, and discloses a chained auxiliary cable laying device, which comprises two chains and a plurality of protection plates, each chain comprises a plurality of chain links which are hinged in sequence, the plurality of protection plates are arranged in sequence along the length direction of the chain, the protection plates are connected between the two chains, and the chain links are connected with the protection plates. The chains are detachably connected end to end so that the multiple protection plates can define an inner cavity, rolling bodies are installed on the inner surfaces and / or the outer surfaces of the protection plates, and at least part of the rolling bodies are arranged on the surfaces of the protection plates in a protruding mode. The rolling body is arranged on the surface of the protection plate, when the cable is dragged to move, the rolling element continuously rotates to greatly reduce friction force, the protection plate forms a flexible frame through the two parallel chains and the hinged chain links, and the device can flexibly deform along with the bending path of the cable. In addition, an operator can quickly place the cable into the inner cavity through the detachable head-tail connection mode.

Description

Technical Field

[0001] This utility model relates to the field of optical cable laying technology, and in particular to a chain-type auxiliary cable laying device. Background Technology

[0002] Cable laying refers to the process of laying and installing cables along a surveyed route to form a cable line. Depending on the application, it can be divided into several laying methods such as overhead, underground, underwater, wall, and tunnel. The rational selection of cable laying method is very important for ensuring the transmission quality, reliability, construction and maintenance of the line.

[0003] Traditional cable laying often involves dragging, which typically requires dragging over long distances. Since multiple cables are frequently involved in the same process, friction occurs between them during dragging, making the dragging process more difficult and potentially causing overheating and damage to the cable insulation. Therefore, there is an urgent need for a cable laying auxiliary device to prevent cable damage during dragging, protecting the cable from damage caused by pulling. Utility Model Content

[0004] In order to overcome the shortcomings of existing technologies that easily cause wear and tear during cable laying, this utility model provides a chain-type auxiliary cable laying device, which has the advantages of simple assembly and disassembly and can effectively prevent cable wear.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A chain-type auxiliary cable laying device includes two chains and several protective plates. The chains include several chain links that are hinged in sequence. Several protective plates are arranged in sequence along the length of the chains. The protective plates are connected between the two chains. The ends of the chains are detachably connected so that the several protective plates can surround and form an inner cavity. Rolling elements are installed on the inner surface and / or outer surface of the protective plates. At least some of the rolling elements are protruding from the surface of the protective plates.

[0007] Using the above technical solution, the surface of the protective plate is provided with rolling elements. When the cable is dragged, the rolling elements rotate continuously, converting sliding friction into rolling friction, which greatly reduces the friction force on the dragged cable. Furthermore, the cables do not come into direct contact, avoiding damage to the cables due to friction. The protective plate forms a flexible frame through two parallel chains connected by hinged links, allowing the device to flexibly deform along the bending path of the cable. In addition, the detachable connection at both ends allows the operator to quickly place the cable into the inner cavity.

[0008] Preferably, the protective plate has a slot on its side wall, and the chain link is inserted into the slot and fixed to the protective plate with an interference fit.

[0009] Using the above technical solution, when the groove is processed on the side wall of the protection plate, the chain link is inserted along the edge of the groove. Because the inner diameter of the groove is slightly smaller than the outer diameter of the chain link, the contact surface between the chain link and the groove is squeezed and deformed, forming a continuous radial pressure. This pressure makes the friction between the chain link and the protection plate sufficient to resist the axial tension generated by the cable dragging, preventing the protection plate from falling off.

[0010] Preferably, one protection plate corresponds to several chain links.

[0011] By adopting the above technical solution, by limiting the relationship between the number of protection plates and chain links, a single protection plate can cover one or more chain links. The length of the chain links can be adjusted by adjusting the number of chain links to adapt to the length requirements of the protection plate.

[0012] Preferably, adjacent protective plates are connected by different links.

[0013] By adopting the above technical solution, when two protective plates are connected to the same link, they cannot rotate relative to each other within the same link, which would cause rotational interference between the protective plates. This restricts a single link to only one protective plate, ensuring that adjacent protective plates can rotate relative to each other and guaranteeing the flexibility of rotation between the protective plates.

[0014] Preferably, the link includes a first connecting plate and a connecting post. Two adjacent links are connected by a second connecting plate. The first and second connecting plates have through connecting holes at corresponding positions. The connecting post passes through the connecting holes to hinge the first and second connecting plates, thereby hinged the adjacent links.

[0015] By adopting the above technical solution, adjacent chain links can rotate freely around the axis of the connecting column. During the cable laying process, the laying device can better adapt to the angle requirements of cable installation, while simplifying the disassembly and assembly process of the chain and improving construction efficiency.

[0016] Preferably, the chain is provided with a limiting device, which includes a limiting plate disposed on the top of the first connecting plate and / or the second connecting plate. At least one chain link's limiting plate is provided with a limiting post, and the limiting plates of the remaining chain links are provided with limiting holes. The limiting post is sized to match the limiting hole and is detachably connected to the limiting hole.

[0017] Using the above technical solution, a limiting post is installed on the top of the limiting plate of one of the chain links, and limiting holes are opened on the top of the limiting plates of the remaining chain links. The chain links with limiting posts are aligned with the chain links with limiting holes. By vertically inserting the limiting post into the corresponding limiting hole, the circumferential length of the chain is fixed. When the chain length needs to be adjusted, simply disconnect the limiting post from the limiting hole to re-unfold or retract the chain. During cable dragging, this limiting device can prevent relative slippage between chain links, avoiding changes in the internal cavity size due to chain deformation. It also facilitates detachable chain connection.

[0018] As a preferred embodiment, the limiting post is a magnetic limiting post, and a metal part is fixedly installed in the limiting hole. When the preset length of the circumferential connection cable is reached, the magnetic limiting post on the bottom surface of the connecting plate is inserted into the limiting hole on the top surface of the last connecting plate to complete the circumferential connection of the chain.

[0019] Using the above technical solution, after the magnetic limiting post is inserted into the limiting hole, its internal permanent magnet and the metal part generate magnetic attraction, so that the two chain links fit tightly together. The magnetic attraction and the insertion mechanical cooperation work together to prevent the chain from shifting axially when pulled, and also avoid loosening due to vibration.

[0020] Preferably, the limiting post is pinned to the limiting hole.

[0021] By adopting the above technical solution, the pin connection ensures that the limiting post will not slip out after being inserted into the limiting hole.

[0022] Preferably, the protective plate has a groove on its surface, and shaft holes are provided on both sides of the groove. The rolling element includes a roller and a rotating shaft connected to both sides of the roller. The end of the rotating shaft away from the roller is installed in the shaft hole, and the rotating shaft is rotatably connected to the shaft hole.

[0023] Using the above technical solution, when the cable is dragged on the surface of the protective plate, the roller is driven to rotate by the movement of the cable, and the rotating shaft rotates around its own axis in the shaft hole. The contact between the cable and the roller is changed from sliding friction to rolling friction, and the friction force is effectively reduced.

[0024] Preferably, the retaining plate includes a first retainer and a second retainer. The first retainer has a plurality of slots, and the second retainer has a plurality of openings. The rolling element is mounted in the slot, passes through the opening, and is partially exposed outside the opening. The diameter of the rolling element is greater than the radial length of the opening.

[0025] Using the above technical solution, the groove depth of the first cage can be slightly larger than the radius of the rolling element, so that the rolling element can still roll freely after being partially embedded. The opening diameter of the second cage can be smaller than the diameter of the rolling element. When the two are stacked, the edge of the opening forms a point contact with the surface of the rolling element. During the cable dragging process, the rolling element rotates under pressure, so that the cable and the protective plate form a rolling contact. The staggered distribution of the groove and the opening ensures that the rolling element can only move within a preset range, which maintains the rolling freedom and avoids it from leaving the installation position.

[0026] The beneficial effects of this utility model are: (1) it can effectively reduce the wear of cables caused by friction; (2) the disassembly and assembly method is simple and the disassembly and assembly efficiency is high; (3) it can adapt to the protection of cables of different sizes. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the chain-type auxiliary cable laying device of this utility model;

[0028] Figure 2 This is a top view of the chain-type auxiliary cable laying device of this utility model;

[0029] Figure 3 This is a front view of the chain-type auxiliary cable laying device of this utility model;

[0030] Figure 4 This is a front view of the chain-type auxiliary cable laying device of this utility model, which is spliced ​​into a semi-circular structure.

[0031] Figure 5 This is a top view of the multi-chain auxiliary cable laying device of this utility model after it has been unfolded.

[0032] Figure 6 This is a schematic diagram of the structure of the multi-chain auxiliary cable laying device of this utility model after splicing.

[0033] Figure 7 This is a schematic diagram of the chain structure;

[0034] Figure 8 This is a schematic diagram of the structure of the limiting post and the limiting hole pin connection of this utility model;

[0035] Figure 9 This is a cross-sectional view of one embodiment of the protective plate;

[0036] Figure 10 This is a cross-sectional view of another embodiment of the protective plate.

[0037] In the diagram: 10, chain; 11, chain link; 111, first connecting plate; 112, connecting post; 113, second connecting plate; 12, limiting device; 121, limiting post; 1211, pin hole; 1212, pin shaft; 122, limiting hole; 123, limiting plate; 20, protective plate; 211, first retainer; 212, second retainer; 213, slot; 214, opening; 22, rolling element; 221, roller; 222, rotating shaft; 23, ball; 24, groove; 241, shaft hole; 30, inner cavity. Detailed Implementation

[0038] This application provides a chain-type auxiliary cable laying device, such as... Figures 1 to 4 As shown, the device includes two chains 10 and several protective plates 20. The chains 10 include several chain links 11 that are hinged together in sequence. The protective plates 20 are arranged at intervals along the length of the chains 10. The protective plates 20 are connected between the two chains 10. The ends of the chains 10 are detachably connected so that the protective plates 20 can surround the chain. Rolling elements 22 are installed on the inner and / or outer surfaces of the protective plates 10. At least some of the rolling elements 22 are protruding from the surface of the protective plates 20.

[0039] Among them, such as Figure 1 and Figure 3 As shown, the detachable chain 10 refers to a chain structure composed of independent chain links 11 connected in series and not forming a closed loop; the protective plate 20 refers to a plate-shaped component with planar support function, which can be made of metal or plastic material, and its two sides are fixed to the chain 10 to form a segmented protective structure; the rolling element 22 refers to a spherical or cylindrical element that can rotate around an axis; the detachable connection refers to a mechanical connection method that allows the inner cavity 30 to open or close.

[0040] Specifically, two parallel chains 10 form a flexible frame through hinged links 11, and a protective plate 20 is laterally connected between the chains 10 to form a cavity. When the cable is dragged, the rolling element rotates continuously, converting sliding friction into rolling friction. At the same time, the hinged structure of the chains 10 allows the device to flexibly deform along the bending path of the cable, providing better adaptability. In addition, the openable and closable nature of the cavity allows operators to quickly place the cable into the protective structure.

[0041] When the rolling element 22 protrudes from the outer surface of the protective plate 20, the installed cable can be passed through the inner cavity 30. The cable to be dragged contacts the rolling element on the outer surface of the protective plate and is dragged forward. When the rolling element 22 protrudes from the inner surface of the protective plate 20, the cable to be dragged is wrapped in the inner cavity 30, and the rolling element 22 on the protective plate 20 forms rolling contact with the cable surface. Preferably, the rolling element 22 protrudes from the outer surface of the protective plate 20, fixing the position of the installed cable, the position of the laid cable, and the position of the cable laying device. This avoids changing the position or length of the installed cable laying device as the cable is dragged, making the operation more efficient.

[0042] Better, such as Figure 3 and Figure 4 As shown, the protective plates 20 are assembled into a semi-circular structure or an unclosed circular structure and fastened to the ground, forming a closed inner cavity 30. The pre-laid cables are placed inside the inner cavity 30. This design can accommodate the installation of cables of varying quantities and sizes. Figure 3 and Figure 4 As shown, the bottom can also be secured with ropes such as adjustable cable ties to bundle and fix the installed cables, facilitating the organization of internal cables. Furthermore, the protective plate 20 can be joined with the chain 10 to form a completely closed ring structure with an inner cavity 30.

[0043] Through the above technical solution, the friction during cable movement is changed from sliding friction to rolling friction, significantly reducing wear on the insulation surface. The flexible frame structure ensures mechanical strength while adapting to laying paths with different bending radii. The quick-assembly and disassembly cavity design greatly improves operational efficiency, avoiding the need to disassemble cable end joints as in traditional methods. Preferably, as... Figure 5 and Figure 6 As shown, multiple protective plates can also be spliced ​​together by chains to adapt to different length requirements.

[0044] This application further proposes that the side wall of the protective plate 20 is provided with a slot, and the chain link 11 is inserted into the slot and fixed to the protective plate 20 with interference fit.

[0045] The "slot" refers to a locking structure with a specific depth on the side wall of the protective plate 20, whose dimensions match those of the chain link 11, forming a mechanical lock through an interference fit. Interference fit means that the chain link 11 is directly inserted into the slot, with the size of the chain link 11 slightly larger than the size of the slot, resulting in an interference fit. Specifically, the protective plate 20 has a slot machined into its side wall, and the chain link 11 is inserted into the slot. Because the inner diameter of the slot is slightly smaller than the outer diameter of the chain link 11, the interference fit effectively prevents the protective plate 20 from falling off, improving the safety and reliability of cable laying operations.

[0046] It should be noted that the present invention is not limited to interference fit, and welding, bolts or snap-fit ​​connections can also be used.

[0047] like Figure 3 As shown, this application further proposes a protection plate 20 corresponding to several links 11.

[0048] In this context, "one protective plate 20 corresponds to several chain links 11" means that the length of a single protective plate 20 covers the structural area formed by one or more chain links 11, ensuring that the width of the protective plate 20 can meet the requirements of the laying device and is not limited by the number of chain links 11.

[0049] This application further proposes a technical solution where two adjacent protective plates 20 are connected by different links 11.

[0050] The rule that a link 11 can connect to at most one protective plate 20 means that the connection point of a single link 11 is only allowed to establish a fixed relationship with a single protective plate 20, which ensures that the links 11 between adjacent protective plates 20 can rotate relative to each other, thus ensuring the flexibility of rotation between the protective plates 20.

[0051] like Figure 7 As shown, this application further proposes that the link 115 includes a first connecting plate 111 and a connecting post 112. Two adjacent links 11 are connected by a second connecting plate 113. The first connecting plate 111 and the second connecting plate 113 have through connecting holes at corresponding positions. The connecting post passes through the connecting holes to hinge the first connecting plate 111 and the second connecting plate 113, so as to hinge the adjacent links.

[0052] The first connecting plate 111 refers to the plate-shaped component that constitutes the main structure of the link 11; the connecting post 112 refers to the cylindrical component used to realize the hinge of adjacent links 11, which can be implemented by a pin or a rotating shaft with a limiting protrusion, and its function is to form the rotation center between links 11; the second connecting plate 113 refers to the plate-shaped structure that connects two adjacent links 11, and is connected to the first connecting plate 111 through the connecting post to realize the connection between the two links 11.

[0053] Specifically, adjacent chain links 11 are hinged together by connecting post 112 and second connecting plate 113, allowing the chain links 11 to rotate freely around the axis of connecting post 112. During cable laying, this allows the laying device to better adapt to the angle requirements of cable installation, while simplifying the assembly and disassembly of the chain 10 and improving construction efficiency.

[0054] like Figure 7As shown, this application further proposes that the chain 10 be provided with a limiting device 12. The limiting device 12 includes a limiting plate 123 disposed on the top of the first connecting plate 111 and / or the second connecting plate 113. The limiting plate 123 of at least one link 11 is provided with a limiting post 121, and the limiting plates 123 of the remaining links 11 are provided with limiting holes 122. The limiting post 121 is sized to match the limiting hole 122 and is detachably connected to the limiting hole 122.

[0055] The limiting device 12 refers to the mechanical structure used to constrain the circumferential extension and retraction of the chain 10. The detachable connection refers to the structural relationship that allows the limiting post 121 and the limiting hole 122 to be repeatedly separated and engaged. Specifically, it can be achieved by plug-in engagement or pin locking.

[0056] Specifically, when the chain 10 is extended to the length of the cable, the operator selects the chain link 11 with the limiting post 121 and the chain link 11 with the limiting hole 122 for alignment. By vertically inserting the limiting post 121 into the corresponding limiting hole 122, a mechanical interlocking structure is formed. At this time, the circumferential length of the chain 10 is fixed. During the cable dragging process, the limiting device 12 can prevent relative slippage between the chain links 11 and avoid changes in the size of the inner cavity 30 due to the deformation of the chain 10. When it is necessary to adjust the length of the chain 10, it is only necessary to disconnect the connection between the limiting post 121 and the limiting hole 122 to re-extend or retract the chain 10.

[0057] Furthermore, when the chain 10 is equipped with a limiting plate 123, it is not necessary to interference fit the chain 10 and the protective plate 20. Instead, the side wall of the limiting plate 123 can be interference fitted or welded to the protective plate 20. The plate-like structure of the limiting plate 123 makes it easier to connect with the protective plate 20. Specifically, interference fitting, welding, snap-fit ​​and bolt connection can be used.

[0058] This application further proposes that the limiting post 121 is a magnetic limiting post 121, and a metal part is fixedly installed in the limiting hole 122. When the preset length of the circumferential connection cable is reached, the magnetic limiting post 121 on the bottom surface of the connecting plate 111 is inserted into the limiting hole 122 on the top surface of the last connecting plate 111 to complete the circumferential connection of the chain 10.

[0059] The magnetic limiting post 121 refers to a columnar fixing component made of magnetic material, specifically a metal post with an embedded permanent magnet. It is fixed by magnetic attraction when inserted into the limiting hole 122. The metal part refers to the component fixed inside the limiting hole 122 to form a magnetic attraction with the magnetic limiting post 121; it can be made of a ferromagnetic metal ring.

[0060] Specifically, when the chain 10 is extended to the required cable laying length, the operator closes the chain 10 at both ends. At this time, a magnetic limiting post 121 is provided on the limiting plate 123 of the first chain link 11, which is perpendicularly aligned with the limiting hole 122 on the limiting plate 123 of the last chain link 11 at the required length. After the magnetic limiting post 121 is inserted into the limiting hole 122, its internal permanent magnet generates a magnetic attraction force with the metal parts, making the two chain links 11 fit tightly together. The magnetic attraction force and the insertion mechanical cooperation work together to prevent the chain 10 from loosening when pulled. This application solves the problem of cable protection device falling off due to mechanical loosening of the circumferential connection of the chain 10, and improves the closure reliability by utilizing the synergistic effect of magnetic attraction and insertion.

[0061] It should be noted that the chain 10 can also be closed by means of mechanical buckles or bolts.

[0062] This application further proposes that the limiting post 121 and the limiting hole 122 are connected by a pin connection.

[0063] Specifically, when chain 10 closes at both ends to form a loop structure, such as Figure 8 As shown, by providing a pin hole 1211 on the limiting post 121, a pin 1212 is inserted to fix it to the limiting hole 122, preventing the limiting post 121 from loosening due to force. When disassembly is required, the connection can be released by pulling out the pin 1212 and removing the limiting post 121 from the limiting hole 122, thus enabling the device to be reused.

[0064] It should be noted that interference fit, welding or adhesive bonding can also be used to connect the first end and the last end.

[0065] like Figure 9 As shown, this application further proposes that the surface of the protective plate 20 is provided with a groove 24, and the two sides of the groove 24 are provided with shaft holes 241 respectively. The rolling body 22 includes a roller 221 and a rotating shaft 222 connected to both sides of the roller 221. The end of the rotating shaft 222 away from the roller 221 is installed in the shaft hole 241. The rotating shaft 222 is rotatably connected to the shaft hole 241. The side of the roller 221 protrudes from the groove 24.

[0066] The groove 24 refers to the recessed area formed on the surface of the protective plate 20, used to accommodate the main body of the rolling element 22 and restrict its axial displacement. The shaft hole 241 refers to the symmetrical circular through holes on both sides of the groove 24, which can be formed by machining, used to fix the rotating shaft 222 and provide it with rotational support. The rotating shaft 222 refers to the cylindrical component connected to both ends of the roller 221, whose diameter matches the size of the shaft hole 241 to achieve a clearance fit, ensuring that the rotating shaft 222 can rotate freely within the shaft hole 241. The roller 221 refers to a cylindrical or drum-shaped rolling component, which can be made of smooth nylon or metal, and whose diameter is greater than the depth of the groove 24, so that the side of the roller 221 protrudes from the surface of the groove 24 for direct contact with the cable.

[0067] Specifically, when the cable is dragged on the surface of the protective plate 20, the roller 221 rotates due to the movement of the cable, and the rotating shaft 222 rotates around its own axis within the shaft hole 241. The contact between the cable and the roller 221 changes from sliding friction to rolling friction, effectively reducing friction. The lateral constraint of the groove 24 on the roller 221 prevents it from shifting during cable dragging, and the clearance fit between the shaft hole 241 and the rotating shaft 222 ensures that the rotational resistance of the roller 221 is minimized. The design of the roller 221 protruding from the groove 24 ensures that the cable only contacts the roller 221, avoiding direct friction with the surface of the cage 21.

[0068] like Figure 10 As shown, this application further proposes that the protective plate 20 includes a first retainer 211 and a second retainer 212. The first retainer 211 has a plurality of slots 213, and the second retainer 212 has a plurality of openings 214. The rolling element 22 is installed in the slots 213, passes through the openings 214, and is partially exposed outside the openings 214. The diameter of the rolling element 22 is greater than the radial length of the openings 214.

[0069] The first cage 211 refers to a split plate with axial installation space, which can be a metal plate or plastic plate with cylindrical grooves or U-shaped grooves. Its function is to provide a space for the rolling element 22. The second cage 212 refers to a split plate with radial limiting, which can be a metal plate or plastic plate with circular through holes. Its function is to form circumferential constraints on the rolling element 22 through the opening 214. The diameter of the rolling element 22 is greater than the height formed by the opening and the groove, and it is exposed on the outside of the protective plate.

[0070] Specifically, the groove 213 depth of the first cage 211 can be slightly larger than the radius of the rolling element 22, allowing the rolling element 22 to roll freely even after being partially embedded; the diameter of the opening 214 of the second cage 212 can be smaller than the diameter of the rolling element 22. When the two are stacked, the edge of the opening 214 forms point contact with the surface of the rolling element 22, confining the rolling element 22 within the groove and opening, ensuring that the rolling element 22 will not come out. During cable dragging, the rolling element 22 rotates under pressure, causing rolling contact between the cable and the protective plate 20. The split cage 21 structure achieves boltless fixation of the rolling element 22 through mechanical constraints, while maintaining the overall structural integrity of the protective plate 20. Preferably, the rolling element 22 is a ball 23.

Claims

1. A chain-type auxiliary cable laying device, characterized in that, It includes two chains and several protective plates. The chains include several chain links that are hinged together in sequence. The protective plates are arranged at intervals along the length of the chains. The protective plates are connected between the two chains. The ends of the chains are detachably connected so that the protective plates can surround and form an inner cavity. Rolling elements are installed on the inner and / or outer surfaces of the protective plates. At least some of the rolling elements are protruding from the surface of the protective plates.

2. The chain-type auxiliary cable laying device according to claim 1, characterized in that, The protective plate has a slot on its side wall, and the chain link is inserted into the slot and fixed to the protective plate with an interference fit.

3. The chain-type auxiliary cable laying device according to claim 1, characterized in that, One of the protection plates corresponds to several of the chain links.

4. The chain-type auxiliary cable laying device according to claim 1, characterized in that, Adjacent protective plates are connected by different links.

5. The chain-type auxiliary cable laying device according to claim 1, characterized in that, The chain link includes a first connecting plate and a connecting post. Two adjacent chain links are connected by a second connecting plate. The first connecting plate and the second connecting plate have through connecting holes at corresponding positions. The connecting post passes through the connecting holes to hinge the first connecting plate and the second connecting plate, so as to hinge the adjacent chain links.

6. The chain-type auxiliary cable laying device according to claim 5, characterized in that, The chain is provided with a limiting device, which includes a limiting plate disposed on the top of the first connecting plate and / or the second connecting plate. At least one of the chain links has a limiting post on its limiting plate, and the limiting plates of the remaining chain links have limiting holes. The limiting post is sized to match the limiting hole and is detachably connected to the limiting hole.

7. The chain-type auxiliary cable laying device according to claim 6, characterized in that, The limiting post is a magnetic limiting post, and a metal part is fixedly installed in the limiting hole. When the preset length of the circumferential connection cable is reached, the magnetic limiting post on the bottom surface of the connecting plate is inserted into the limiting hole on the top surface of the last connecting plate to complete the circumferential connection of the chain.

8. A chain-type auxiliary cable laying device according to claim 6, characterized in that, The limiting post is pinned to the limiting hole.

9. The chain-type auxiliary cable laying device according to claim 1, characterized in that, The protective plate has a groove on its surface, and shaft holes are correspondingly formed on both sides of the groove. The rolling element includes a roller and a rotating shaft connected to both sides of the roller. The end of the rotating shaft away from the roller is installed in the shaft hole, and the rotating shaft is rotatably connected relative to the shaft hole.

10. A chain-type auxiliary cable laying device according to claim 1, characterized in that, The protective plate includes a first retainer and a second retainer. The first retainer has a plurality of slots, and the second retainer has a plurality of openings. The rolling element is mounted in the slot, passes through the opening, and is partially exposed outside the opening. The diameter of the rolling element is greater than the radial length of the opening.

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