Cable laying pulley device and cable laying method

Abstract

The application relates to a cable laying pulley device, and the cable is laid through a cable guide frame, the cable guide frame is provided with a quick port, and the device is characterized in that the device comprises a support unit, a roller unit, a first fastening structure and a second fastening structure; the support unit is provided with a clamping structure used for clamping at the quick port of the cable guide frame to be protected; the support unit comprises a connecting plate and two side plates which are vertically connected at two ends of the connecting plate; the roller unit is rotatably connected between the two side plates through the second fastening structure, and the cable is laid on the cable guide frame through the roller unit; the first fastening structure is used for fixedly connecting the support unit on the cable guide frame; and the application also relates to a cable laying method. The roller unit is arranged to avoid direct friction between the cable and the quick port of the cable guide frame, the cable laying resistance is obviously reduced, and the cable outer sheath is effectively protected.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a pulley device for cable laying and a cable laying method. Background Technology

[0002] Ship construction requires extensive cable laying, a crucial and demanding step. Traditional cable laying involves cables following pre-defined paths, often with numerous bends, sharp edges, or other structural protrusions and turns in the cable trays. Laying the entire cable from start to finish requires dragging it along the path. Whether manually dragging the cable or using a small winch in mechanized construction, this dragging inevitably causes friction between the cable and the cable trays or protruding angles of the ship's hull. This not only increases the resistance during cable pulling, leading to low laying efficiency, but more seriously, the sharp edges at bends directly contact the cable sheath, generating intense sliding friction and cutting action, causing cable damage, scratches, or even breakage. This affects the cable's electrical performance and lifespan, creating safety hazards.

[0003] Therefore, there is an urgent need for a special cable laying auxiliary device that is simple in structure, easy to install, highly adaptable, and can effectively convert sliding friction into rolling friction, so as to improve laying efficiency, reduce labor intensity, and fundamentally protect the integrity of the cable outer sheath. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pulley device and cable laying method for cable laying. Through the design of the roller unit, the problem of cable damage caused by the cutting action of the cable guide at the sharp end is solved. The sliding friction at the sharp end of the cable guide during cable laying is changed to rolling friction, thereby protecting the cable sheath, making mechanized cable laying possible, reducing the labor intensity of personnel and improving efficiency.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention first provides a pulley device for cable laying. The cable is laid through a cable guide, which has a quick-cut opening. The device includes a support unit, a roller unit, a first fastening structure, and a second fastening structure. The roller unit is connected to the support unit, and the support unit is fixedly connected to the cable guide and covers the quick-cut opening through the first fastening structure. The support unit is provided with a snap-fit ​​structure, which snaps into the quick-connect opening of the cable tray to be protected. The support unit includes a connecting plate and two side plates, with the two side plates vertically connected to both ends of the connecting plate; The roller unit is rotatably connected between the two side plates by a second fastening structure, and the cable is laid on the cable tray through the roller unit.

[0006] In a cable laying pulley device of the present invention, the snap-fit ​​structure is a guide rail groove provided on the side plate, and the guide rail groove is a cuboid groove with its opening direction away from the roller unit. The guide rail groove includes a top surface A, a side surface B, and a bottom surface C.

[0007] In a cable laying pulley device of the present invention, the connecting plate is parallel to the top surface A of the guide frame groove; The connecting plate is a rectangular steel plate and its width is equal to half the length of the top surface A of the guide rail groove.

[0008] In a cable laying pulley device of the present invention, the first fastening structure consists of two guide frame fixing bolts. The connecting plate is provided with two first screw holes with internal threads that correspond one-to-one with the guide frame fixing bolts. The internal threads of the first screw holes match the external threads of the guide frame fixing bolts, and the guide frame fixing bolts are installed in the first screw holes.

[0009] In a cable laying pulley device of the present invention, the roller unit includes a roller body, a roller bearing, and a roller shaft. The roller body and the roller shaft are both cylindrical hollow structures and each has a cylindrical internal through hole. The roller bearing is a ring plate structure. Each end of the roller body is provided with a bearing groove of the same size as the roller bearing. The roller bearing is located in the bearing groove. The roller shaft passes through the internal through hole of the roller body and the inner hole of the roller bearing.

[0010] In a cable laying pulley device of the present invention, the second fastening structure consists of two roller fixing bolts. Each of the two side plates is provided with a second screw hole. Both ends of the internal through hole of the roller shaft are provided with internal threads that match the roller fixing bolts. The two roller fixing bolts pass through the second screw holes on the two side plates and are threadedly connected to the internal through hole of the roller shaft.

[0011] In a cable laying pulley device of the present invention, the highest surface E of the roller body is higher than the top surface A of the guide rail groove and there is a height difference H between the two.

[0012] In a cable laying pulley device of the present invention, the maximum overall length is 250mm.

[0013] The present invention also provides a cable laying method, which uses the above-mentioned cable laying pulley device, and the method includes the following steps: Step 1: Install pulley devices at the quick-connect points. A worker should be stationed at each quick-connect point along the cable laying path on the cable guide. Align the guide rail groove with the quick-connect point of the cable guide to be protected, ensuring the quick-connect point is flush against the side B of the guide rail groove. Screw the guide rail fixing bolt into the first screw hole from the lower end, ensuring the guide rail fixing bolt is aligned with the unpunched part on the cable guide. Tighten the guide rail fixing bolt to lock the connecting plate to the cable guide. When the cable tray that needs protection is wide, multiple pulley devices are installed in parallel to completely cover the gaps of the cable tray. Step 2: Conduct inspections and preparations before cable laying. After the pulley device is installed, manually rotate the drum to check its smoothness and ensure that it rotates smoothly. Step 3: Cable laying. The cable is delivered from the cable reel placed at the starting end of the cable laying. The staff next to the cable reel control the pausing and resuming of cable delivery. Only one cable is laid at a time, and each cable is laid in sections. The cable is dragged manually or by a winch. The staff standing by the fast port observes the cable laying process. If the cable gets stuck, they straighten it in time and ensure that the cable passes through the contact surface of the drum unit. After one cable is laid, the next cable is laid, until all cables are laid. Step 4: Remove the pulley device. After the cable laying is completed, unscrew the guide frame fixing bolts and remove the pulley device. Use packing straps to pass through the holes of the perforated angle steel to bundle the multiple cables laid in place to form a cable bundle and fix it on the cable guide frame. Single thick cables can be directly bundled and fixed on the cable guide frame with packing straps.

[0014] In a cable laying method of the present invention, in step two, a limiting rod is vertically installed in the half-holes of two holes on the cable guide frame between the two side plates of the pulley device and close to the two side plates, which are not covered by the connecting plate. The end of the limiting rod passing through the half-hole is provided with a threaded section with external threads and is locked and fixed to the cable guide frame by a first nut and a second nut that match the threaded section. Specifically, the first nut is screwed into the threaded section of the limiting rod, and then the limiting rod with the first nut is vertically inserted into the half-hole from the side through which the cable is laid. On the other side of the cable guide frame, the second nut is screwed into the threaded section of the limiting rod and tightened to lock and fix the limiting rod to the cable guide frame. In step three, when laying the cable, when the cable is almost taut, the staff at the taut end manually adjust the cable so that it is between the two limit rods.

[0015] Based on the above technical solution, the cable laying pulley device and cable laying method of the present invention, after practical application, have the following technical advantages compared with the traditional method of directly pulling the cable at the fast end of the cable guide for laying: 1. This invention transforms the sliding friction between the cable and the cable guide into rolling friction, significantly reducing the pulling resistance at bends and sharp edges of protruding angle steel during cable laying. This can significantly reduce the number of times the cable is segmented during laying, while protecting the cable sheath from damage due to severe friction. This makes mechanized cable laying possible, helps improve laying efficiency, reduces equipment load, reduces labor intensity, and improves overall cable laying efficiency.

[0016] 2. The present invention has a height difference between the roller body and the guide surface of the cable guide, so that the cable is completely separated from the sharp edge during the dragging process, avoiding the cable sheath from being cut or worn, effectively protecting the cable outer sheath, extending the cable service life, and reducing rework or safety hazards caused by damage.

[0017] 3. The present invention has a simple structure and quick installation, and can be used in conjunction with mechanized cable laying equipment such as winches to achieve smooth cable delivery, which is especially suitable for scenarios with complex spaces and long laying paths, such as ships.

[0018] 4. This invention adopts a modular structure. The bracket groove can be adapted to angle steel or steel plate with various thicknesses, making it widely applicable, stable in installation, and easy to assemble and disassemble. The overall length of the device of this invention does not exceed 250mm, making it lightweight, compact, easy to carry, and easy to deploy quickly on site. It can be operated by a single person. This invention supports the parallel use of multiple devices, which can cover longer or wider guide rail surfaces and adapt to the needs of different laying widths.

[0019] 5. In addition to cable laying, this invention can also be applied to various laying scenarios that require protective outer sheaths, such as temporary hoses and drag chain cables, and has strong engineering applicability and scalability. Attached Figure Description

[0020] Figure 1 This is a disassembly diagram of a cable laying pulley device according to the present invention.

[0021] Figure 2 This is a three-dimensional top view of a cable laying pulley device according to the present invention.

[0022] Figure 3 This is a three-dimensional front view of a cable laying pulley device according to the present invention.

[0023] Figure 4 This is a three-dimensional side view of a cable laying pulley device according to the present invention.

[0024] Figure 5This is a three-dimensional rear view of a cable laying pulley device according to the present invention.

[0025] Figure 6 This is an overall schematic diagram of a cable laying pulley device according to the present invention.

[0026] Figure 7 This is a side view of the original cable laying.

[0027] Figure 8 This is a side view of cable laying after using the cable laying pulley device of the present invention.

[0028] Figure 9 This is a top view of the cable laying pulley device of the present invention.

[0029] Figure 10 This is a reverse view of the cable laying pulley device of the present invention.

[0030] Figure 11 This is a schematic diagram of multiple cable laying pulley devices of the present invention installed in parallel.

[0031] Figure 12 This is an overall schematic diagram of the limit rod after installation in this invention. Figure 13 This is a schematic diagram of the installation process of the limit rod in this invention. Figure 14 This is a schematic diagram of typical problems in cable laying sites. Figure 15 This is a schematic diagram illustrating typical problems encountered during cable laying after the cable path has been removed. Reference numerals: 1. Support unit; 11. Side plate; 111. Second screw hole; 12. Guide rail groove; 13. Connecting plate; 131. First screw hole; 2. Roller unit; 21. Roller bearing; 22. Roller shaft; 23. Roller body; 24. Bearing groove; 3. Roller fixing bolt; 4. Guide rail fixing bolt; 5. Limiting rod; 6. First nut; 7. Second nut; 8. Cable guide; 9. Cable; 10. Snap-on opening; D. Guide rail surface; E. Highest surface of roller body; H. Height difference. Detailed Implementation

[0032] The following detailed description of the cable laying pulley device and cable laying method of the present invention, in conjunction with the accompanying drawings and specific embodiments, is provided to provide a clearer understanding of its structural composition and working principle. However, this should not be construed as limiting the scope of protection of the present invention.

[0033] The improvement of this invention addresses the problem that when laying cable 9 at the cut-out 10 of cable tray 8, the cut-out 10 cuts the cable sheath, causing damage to cable 9. It proposes a design concept that changes sliding friction to rolling friction, which protects the cable sheath, reduces the labor intensity of personnel, and improves efficiency.

[0034] like Figure 14 , Figure 15 The diagram shown illustrates typical problems encountered during cable laying. The red portion represents a virtual cable laying path, and the blue portion represents cable tray 8. Figure 15 The image shows the state after removing the red virtual cable laying path. Cable guide 8 is usually composed of perforated angle steel. During cable threading, regardless of whether the cable is laid from bottom to top or top to bottom, as shown... Figure 15 The quick-cut section 10 in the middle circle will definitely generate friction. The function of the cable laying pulley device in this invention is to change the force point of this quick-cut section 10 from sliding friction to rolling friction. This can reduce frictional resistance and protect the cable 9 from damage to the cable sheath due to friction.

[0035] Example 1, such as Figure 1-6 As shown, this embodiment is a cable laying pulley device. The cable 9 is laid through a cable guide 8, which has a quick-cut opening 10. The cable laying pulley device of this embodiment includes a support unit 1, a roller unit 2, a first fastening structure, and a second fastening structure. The support unit 1 is provided with a snap-fit ​​structure, which is used to snap onto the quick-cut opening 10 of the cable guide 8 to be protected. The support unit 1 includes a connecting plate 13 and two side plates 11, which are vertically connected to both ends of the connecting plate 13. The roller unit 2 is rotatably connected between the two side plates 11 through the second fastening structure. The cable 9 is laid on the cable guide 8 through the roller unit 2. The first fastening structure is used to fix the support unit 1 to the cable guide 8.

[0036] The snap-fit ​​structure is a guide rail groove 12 provided on the side plate 11. The guide rail groove 12 is a cuboid groove with its opening direction away from the roller unit 2. The guide rail groove 12 includes a top surface A, a side surface B, and a bottom surface C. The connecting plate 13 is parallel to the top surface A of the guide rail groove 12. The connecting plate 13 is a rectangular steel plate and its width is equal to half the length of the top surface A of the guide rail groove 12. This ensures that when the pulley device of this embodiment is subsequently installed on the cable guide, the punched holes on the cable guide 8 will not be completely blocked by the connecting plate 13, leaving half of the holes unblocked. This allows for the vertical insertion and fixing of the limiting rod 5 into the unblocked half-hole to limit the cable laying when needed.

[0037] The first fastening structure consists of two guide bracket fixing bolts 4. The connecting plate 13 is provided with two first screw holes 131 with internal threads that correspond one-to-one with the guide bracket fixing bolts 4. The positions of the two first screw holes 131 are such that when the guide bracket fixing bolts 4 pass through the first screw holes 131 for fixing, they will not be screwed into the holes of the punched angle steel. The internal threads of the first screw holes 131 match the external threads of the guide bracket fixing bolts 4, and the guide bracket fixing bolts 4 are installed in the first screw holes 131.

[0038] The roller unit 2 includes a roller body 23, a roller bearing 21, and a roller shaft 22. Both the roller body 23 and the roller shaft 22 are cylindrical hollow structures and each has a cylindrical internal through hole. The roller bearing 21 is a ring plate structure. Each end of the roller body 23 has a bearing groove 24 of the same size as the roller bearing 21. The roller bearing 21 is located in the bearing groove 24. The roller shaft 22 passes through the internal through hole of the roller body 23 and the inner hole of the roller bearing 21.

[0039] The second fastening structure consists of two roller fixing bolts 3. Each of the two side plates 11 is provided with a second screw hole 111. Both ends of the internal through hole of the roller shaft 22 are provided with internal threads that match the roller fixing bolts 3. The two roller fixing bolts 3 pass through the second screw holes 111 on the two side plates 11 and are threadedly connected to the internal through hole of the roller shaft 22.

[0040] like Figure 7 As shown, before the pulley device of this embodiment was added, the cable 9 and the cable guide 8 were in direct contact. During the dragging process, the cable was cut at the sharp end 10, which damaged the outer sheath of the cable.

[0041] like Figure 8 As shown, after adding the pulley device of this embodiment, it can be seen that the highest surface E of the roller body is higher than the top surface A of the guide groove 12. There is a height difference H between the highest surface E of the roller body and the top surface A of the guide groove 12. That is, there is a certain height difference H between the guide surface D of the cable guide 8 and the highest surface E of the roller body. This height difference H ensures that the cable 9 does not directly contact the guide surface D of the cable guide 8 during the dragging process, thereby completely eliminating sliding friction and realizing pure rolling friction without generating cutting action. The size of this height difference H can be optimized according to the guide structure, etc., to ensure the effect of protecting the outer sheath of the cable.

[0042] In this embodiment, the cable guide 8 is composed of perforated angle steel. If the guide surface D of the protected cable guide 8 is very wide, a cable guide such as... Figure 11 As shown, multiple pulley devices are sequentially snapped onto the cable guide 8 via the guide groove 12 and fixed separately. They are installed side by side to cover a longer protection area, achieving a complete protection effect. This method is suitable for scenarios such as large cable bundles or long-distance laying.

[0043] During cable laying, cable 9 is initially in a slack state during the threading process. As cable 9 is tightened, it may sway from side to side. At this time, cable 9 may come into contact with any part of the guide surface D of the cable guide 8. Only when cable 9 is pulled into a stressed state can its approximate laying position be determined. By installing multiple pulley devices side by side on the cable guide 8 and completely covering the cable guide 8, the entire sharp edge surface is protected, which can prevent cable 9 from rubbing against the sharp edge 10 during the process of slackening to tightening.

[0044] To facilitate carrying and installation, the pulley device in this embodiment is designed with miniaturization in mind. In order to match the width of most guide frames, the overall length of the entire cable laying pulley device is generally no more than 250mm, which makes it easy to carry and operate by a single person. The overall length can also be set to a larger size according to actual needs.

[0045] The width of the guide rail groove 12, i.e. the length of the side B, is preferably set to 8.2mm. The pulley device in this embodiment can be used not only on cable guide rails 8 with a plate thickness of less than or equal to 8mm, but also theoretically on any protruding edge with a plate thickness of 8mm or less. If it exceeds 8mm, the overall structural strength should be reconsidered and the dimensions of the pulley device and the guide rail groove 12 should be adjusted.

[0046] The pulley device in this embodiment can be used not only for cable laying, but also for temporary hose laying, temporary drag chain cable laying, and other places where the outer sheath needs to be protected, reducing friction of hoses or cables at sharp points such as bends.

[0047] This cable laying pulley device, through its modular and miniaturized design, enables rapid installation, flexible combination, and wide applicability. It converts sliding friction into rolling friction, significantly reducing cable laying resistance, effectively protecting the cable sheath, extending cable service life, and reducing rework or safety hazards caused by damage. It is suitable for various scenarios such as shipbuilding and industrial installation.

[0048] Example 2: This example is a cable laying method. This example uses the cable laying pulley device from Example 1 to realize the operation of laying cables using the cable laying pulley device, including the following steps: Step 1: Install pulley devices at the quick-connect points 10. At each bend in the cable guide 8 path (i.e., at the quick-connect points 10), a worker stands at each point. The worker installs their cable-laying pulley device at each quick-connect point 10 of the cable guide 8. Figure 9 , Figure 10As shown, align the guide rail groove 12 with and insert it into the quick-cut 10 of the cable guide rail 8 to be protected. Insert the cable guide rail 8 all the way in so that the quick-cut 10 of the cable guide rail 8 contacts the side B of the guide rail groove 12 to protect the quick-cut 10. Screw the guide rail fixing bolt 4 into the first screw hole 131 from the lower end of the first screw hole 131, and ensure that the guide rail fixing bolt 4 is not aligned with the punched hole on the cable guide rail 8. Tighten the guide rail fixing bolt 4 to press the cable guide rail 8 with the device. Lock and fix the connecting plate 13 to the cable guide rail 8 so that the guide rail surface D of the cable guide rail 8 is close to the top surface A of the guide rail groove 12. like Figure 11 As shown, when the width of the opening 10 of the cable guide 8 that needs to be protected is large, multiple pulley devices are used in parallel to ensure that the opening 10 of the cable guide 8 is covered by the pulley devices. Step 2: Conduct inspection and preparation work before cable laying. After the pulley device is installed, manually rotate the drum 23 to check its smoothness of rotation and ensure that it rotates smoothly to reduce cable 9 friction. like Figure 12 , 13 As shown, depending on the actual needs, a limiting rod 5 can be vertically installed in the half-holes of the two holes not covered by the connecting plate 13 in the cable guide 8 between the two side plates 11 of the pulley device and near the two side plates 11. The end of the limiting rod 5 that passes through the half-hole has a threaded section with external threads, and is locked and fixed to the cable guide 8 by the first nut 6 and the second nut 7 that match the threaded section. Specifically, the first nut 6 is screwed into the threaded section of the limiting rod 5, and the limiting rod 5 with the first nut 6 is further vertically inserted into the half-hole from the side through which the cable is laid. The second nut 7 is screwed into the threaded section of the limiting rod 5 on the other side of the cable guide 8 and tightened to lock and fix the limiting rod 5 to the cable guide 8, so as to limit the subsequent laying of the cable 9. Step 3: Cable laying. Cable 9 is output from the cable drum placed at the starting end of the cable laying. The staff next to the cable drum controls the pause and resumption of cable output. When it is necessary to pause the output of the cable, the cable drum is braked in time, and the rotation of the cable drum is resumed when necessary to continue outputting cable 9. Each time, only a single cable 9 is laid. Each cable 9 is laid in sections. At some corners where it is difficult to pull, i.e., the quick joints 10, it is necessary to stop. In traditional cable laying, a single cable 9 needs to be divided into sections many times. However, after installing this device, because the sliding friction at the quick joints 10 is converted into rolling friction, the resistance is reduced, which can significantly reduce the number of sections, improve cable laying efficiency, and at the same time protect the outer sheath of the cable. Cable 9 is laid manually or by using a winch. The staff standing by the fast port 10 observes whether the cable gets stuck or comes off the contact surface of the drum during the laying process. If the cable gets stuck, straighten the cable in time and ensure that the cable 9 passes through the contact surface of the drum unit 2. When the cable 9 is about to reach the tension state, manually adjust the cable 9 so that it is between the two limit rods 5 to ensure that the cable 9 contacts the roller body 23 and rolls through; When the cable is laid in a relatively stable, straight and long horizontal path, a winch can be used to drag the cable 9. First, the starting end of the cable 9 is passed through and fixed in the hole of the thin steel wire of the winch. The winch is then operated to drag the cable 9 until the cable is laid in place. Using mechanized cable laying equipment in conjunction with cable laying can help improve laying efficiency, reduce equipment load, reduce labor intensity and improve overall cable laying efficiency. In other cases, cable 9 is laid manually by dragging it along the cable laying path. Special types of cables, such as network cables, can only be laid by manually dragging them. After one cable 9 is laid in place, the next cable 9 is laid, until all cables are laid. Step 4: Remove the pulley device. After the cable laying is completed, loosen and remove the guide frame fixing bolts 4. Remove the pulley device for future reuse. Use packing straps to bundle the multiple cables 9 laid in place through the holes of the perforated angle steel to form a cable bundle and fix it to the cable guide frame 8. For single, thicker cables 9, there is no need to bundle them into a cable bundle. After laying, simply use packing straps to bundle the cables to the cable guide frame 8 through the holes of the perforated angle steel. The number of cables 9 in a cable bundle varies depending on their thickness. In a stable, horizontal cable laying path, packing straps can be used at intervals to fix the cables 9 to the cable guide frame 8. Cable segments laid at corners, on slopes, or in vertical cable laying paths need to be fixed with packing straps at each perforated angle steel that the cable 9 passes through.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A pulley device for cable laying, wherein a cable (9) is laid through a cable guide (8), the cable guide (8) having a quick-cut opening (10), characterized in that, It includes a support unit (1), a roller unit (2), a first fastening structure and a second fastening structure. The roller unit (2) is connected to the support unit (1). The support unit (1) is fixedly connected to the cable guide (8) through the first fastening structure and covers the fastener (10). The bracket unit (1) is provided with a snap-fit ​​structure, which snaps into the quick-cut (10) of the cable tray (8) to be protected; The support unit (1) includes a connecting plate (13) and two side plates (11), the two side plates (11) being vertically connected to both ends of the connecting plate (13); The roller unit (2) is rotatably connected between the two side plates (11) by a second fastening structure, and the cable (9) is laid on the cable guide (8) through the roller unit (2).

2. The cable laying pulley device according to claim 1, characterized in that, The snap-fit ​​structure is a guide groove (12) provided on the side plate (11), and the guide groove (12) is a cuboid groove with its opening direction away from the roller unit (2); The guide rail groove (12) includes a top surface A, a side surface B and a bottom surface C.

3. The cable laying pulley device according to claim 2, characterized in that, The connecting plate (13) is parallel to the top surface A of the guide groove (12); The connecting plate (13) is a rectangular steel plate and its width is equal to half the length of the top surface A of the guide groove (12).

4. The cable laying pulley device according to claim 1, characterized in that, The first fastening structure consists of two guide frame fixing bolts (4). The connecting plate (13) is provided with two first screw holes (131) with internal threads that correspond one-to-one with the guide frame fixing bolts (4). The internal threads of the first screw holes (131) match the external threads of the guide frame fixing bolts (4). The guide frame fixing bolts (4) are installed in the first screw holes (131).

5. A pulley device for cable laying according to claim 1, characterized in that, The roller unit (2) includes a roller body (23), a roller bearing (21) and a roller shaft (22). The roller body (23) and the roller shaft (22) are both cylindrical hollow structures and both have cylindrical internal through holes. The roller bearing (21) is a ring plate structure. Each end of the roller body (23) is provided with a bearing groove (24) of the same size as the roller bearing (21). The roller bearing (21) is located in the bearing groove (24). The roller shaft (22) passes through the internal through hole of the roller body (23) and the inner hole of the roller bearing (21).

6. A cable laying pulley device according to claim 5, characterized in that, The second fastening structure consists of two roller fixing bolts (3). Each of the two side plates (11) is provided with a second screw hole (111). Both ends of the internal through hole of the roller shaft (22) are provided with internal threads that match the roller fixing bolts (3). The two roller fixing bolts (3) pass through the second screw holes (111) on the two side plates (11) respectively and are threadedly connected to the internal through hole of the roller shaft (22).

7. A pulley device for cable laying according to claim 1, characterized in that, The highest surface E of the roller body is higher than the top surface A of the guide groove (12), and there is a height difference H between the two.

8. A pulley device for cable laying according to claim 1, characterized in that, Its maximum overall length is 250mm.

9. A cable laying method, wherein the laying method uses the cable laying pulley device according to any one of claims 1-8, characterized in that, The method includes the following implementation steps: Step 1: Install pulley devices at the quick-cut opening (10). A worker stands at each quick-cut opening (10) along the cable laying path on the cable guide (8). Align the guide groove (12) with the quick-cut opening (10) of the cable guide (8) to be protected, so that the quick-cut opening (10) is close to the side B of the guide groove (12). Screw the guide fixing bolt (4) into the first screw hole (131) from the lower end of the first screw hole (131), and ensure that the guide fixing bolt (4) is aligned with the unpunched part on the cable guide (8). Tighten the guide fixing bolt (4) to lock the connecting plate (13) and the cable guide (8) together. When the width of the cable tray (8) that needs to be protected is large, multiple pulley devices are installed in parallel to completely cover the fast opening (10) of the cable tray (8); Step 2: Conduct inspection and preparation work before cable laying. After the pulley device is installed, manually rotate the drum body (23) to check its smoothness and ensure that it rotates smoothly. Step 3: Cable laying is carried out. The cable (9) is output from the cable drum placed at the starting end of the cable laying. The staff next to the cable drum control the pause and resumption of cable output. Each time, only a single cable (9) is laid. Each cable (9) is laid in sections. The cable (9) is dragged manually or by a winch. The staff standing by the fast port (10) observes the cable laying process. If the cable gets stuck, the cable is straightened in time and the cable (9) is ensured to pass through the contact surface of the drum unit (2). After one cable (9) is laid in place, the next cable (9) is laid, until all cables are laid. Step 4: Remove the pulley device. After the cable laying is completed, unscrew the guide frame fixing bolt (4) and remove the pulley device. Use packing straps to pass through the holes of the punched angle steel to bundle the multiple cables (9) that have been laid in place to form a cable bundle and fix it on the cable guide frame (8). A single thick cable (9) is directly bundled and fixed on the cable guide frame (8) by packing straps.

10. A cable laying method according to claim 9, characterized in that, In step two, a limiting rod (5) is vertically installed in the half-holes of the two holes on the cable guide frame between the two side plates (11) of the pulley device and close to the two side plates (11), which are not covered by the connecting plate (13). The end of the limiting rod (5) that passes through the half-hole is provided with a threaded section with external threads and is locked and fixed on the cable guide frame by a first nut (6) and a second nut (7) that match the threaded section. Specifically, the first nut (6) is screwed into the threaded section of the limiting rod (5), and then the limiting rod (5) with the first nut (6) is vertically inserted into the half-hole from the side through which the cable is laid, and the second nut (7) is screwed into the threaded section of the limiting rod (5) on the other side of the cable guide frame and tightened, so that the limiting rod (5) and the cable guide frame (8) are locked and fixed. In step three, when laying the cable, when the cable (9) is about to be taut, the staff at the fast end (10) manually adjust the cable (9) so that it is between the two limit rods (5).

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