Three-roller wheel texturing system and production line for fireproof cable

Abstract

This application discloses a three-roller corrugating system and production line for fire-resistant cables, relating to the technical field of cable production equipment. It includes a rotating disk mounted on the cable, a corrugating drive component for driving the rotating disk to rotate, and a guide disk for guiding the cable. The guide disk is arranged parallel to the rotating disk. The rotating disk is equipped with multiple rollers for corrugating the armor layer on the cable. The rollers are spaced apart circumferentially along the cable and sequentially spaced apart along the length of the cable. The distance from the rollers to the cable axis decreases sequentially along the direction of cable traction. When corrugating the armor layer, the distance from the end of the roller closest to the cable armor layer to the cable axis is less than the cable radius. This application has the effect of performing multiple smooth corrugations on the cable armor layer.

Description

Technical Field

[0001] This application relates to the technical field of cable production equipment, and in particular to a three-roller corrugation system and production line for fire-resistant cables. Background Technology

[0002] Fire-resistant cables consist of a conductor, an insulation layer, a filler layer, an armor layer, and an insulating protective layer. During production, a plastic insulation layer is first extruded from the conductor using a plastic extrusion device, providing insulation. Then, fire-retardant material is wrapped around the insulation layer using a sheathing device, and mica tape is wound around the fire-retardant material using a winding device. The mica tape and fire-retardant material together form the filler layer. The armor layer typically uses rolled metal sheets wrapped around the mica tape. Finally, polyethylene or polyvinyl chloride is extruded from the armor layer using a protective layer extrusion device, forming an insulating protective layer to protect the cable.

[0003] In related technologies, to improve the connection between the armor layer and the adjacent two layers and increase its ductility, the armor layer is often corrugated. Currently, corrugating machines are commonly used for corrugating armor layers. Existing corrugating machines include a U-shaped support base with the U-shaped opening facing the armor layer. A wheel-shaped cutting blade is rotatably connected in the middle of the support base. The U-shaped support base is set to rotate around the circumference of the armor layer. When the semi-finished cable is pulled, the U-shaped support base drives the wheel-shaped cutting blade to rotate around the armor layer, causing the wheel-shaped cutting blade to rotate and roll threads on the surface of the armor layer. When the linear velocity of the armor layer being pulled and the rotation speed of the corrugating blade maintain a certain speed ratio, the wheel-shaped cutting blade rolls continuous and uniform spiral patterns on the armor layer.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: when the wheel-shaped rolling cutter rolls the armor layer, the wheel-shaped rolling cutter presses the surface of the armor layer into grooves during the rotation process. When a single rolling cutter rolls the surface of the armor layer to form a spiral pattern in one pass, the deformation of the armor layer surface is large in a short period of time, resulting in uneven rolling of the armor layer surface or even cracks. Summary of the Invention

[0005] In order to improve the problem of uneven rolling texture or even cracks on the surface of the armor layer caused by the spiral pattern formed by the rolling cutter in one rolling, this application provides a three-roller rolling system and production line for fireproof cables.

[0006] In the first aspect, this application provides a three-roller corrugating system for fire-resistant cables, which adopts the following technical solution:

[0007] A three-roller corrugating system for fire-resistant cables includes a mounting frame. The mounting frame is equipped with a rotating disk for mounting on the cable, a corrugating drive for driving the rotating disk to rotate, and a guide disk for guiding the cable. The guide disk is arranged parallel to the rotating disk. The rotating disk is equipped with multiple rollers for corrugating the armor layer on the cable. The multiple rollers are spaced apart along the circumference of the cable and sequentially spaced apart along the length of the cable. The distance from the multiple rollers to the cable axis decreases sequentially along the direction of cable traction. When corrugating the armor layer on the cable is required, the distance from the end of the roller closest to the cable armor layer to the cable axis is less than the radius of the cable.

[0008] By adopting the above technical solution, when it is necessary to roll the armor layer of the cable, the cable is positioned and supported by the rotating disk and the guide disk. Then, the rolling drive is started to pull the cable. At this time, by adjusting the speed of the cable and the speed of the rotating disk, the rolling roller rolls out a continuous and uniform spiral pattern on the armor layer. Multiple rolling rollers roll the spiral pattern in a progressive manner along the traction direction of the cable, so that the spiral pattern of the armor layer is formed through multiple short-stroke rolling processes. This improves the smoothness of the spiral pattern formation of the armor layer and improves the problem of uneven rolling or even cracks on the surface of the armor layer caused by the rolling cutter rolling the spiral pattern on the surface of the armor layer in one pass.

[0009] Optionally, the rotating disk is provided with a rolling column for mounting the rolling wheel. The rolling wheel is rotatably disposed at one end of the rolling column near the cable around its axis. A plurality of rolling columns are arranged at intervals along the circumference of the cable. The rolling column is provided with an adjustment component for adjusting the movement of the rolling wheel toward or away from the cable.

[0010] By adopting the above technical solution, when it is necessary to corrugate the armor layer of the cable, the rolling wheel rolls on the armor layer during the rolling process. This reduces wear on the rolling wheel and improves the smoothness of the corrugated pattern, thus mitigating the problem of uneven corrugation or even cracks on the armor layer surface caused by the rolling cutter forming spiral patterns in a single pass. Furthermore, by adjusting the distance between the rolling wheel and the cable using an adjustment component, the rolling wheel can be used to roll spiral patterns of different depths.

[0011] Optionally, a receiving groove is provided at one end of the rolling column near the cable. The receiving groove is open on both sides along the length of the cable. The rolling wheel is installed in the receiving groove. Two adjustment holes are correspondingly provided on the inner walls of both sides of the receiving groove. The length direction of the two adjustment holes is along the length direction of the rolling column.

[0012] The adjustment assembly includes an adjustment rod with two adjustment holes passing through its two ends, and adjustment nuts threaded to both ends of the adjustment rod. The two adjustment nuts are in movable contact with the outer walls on both sides of the rolling column, and the rolling wheel is rotatably connected to the adjustment rod.

[0013] By adopting the above technical solution, when it is necessary to roll grooves of different depths onto the armor layer, the adjusting nut is driven to move away from another adjusting nut. Then, the adjusting rod is driven to slide along the length of the rolling column within the adjusting hole. When the rolling wheel moves to the appropriate position within the receiving groove along with the adjusting rod, the adjusting nut is driven to move until it is pressed against the outer wall of the rolling column, thereby completing the adjustment of the rolling wheel position. Adjusting the positions of multiple rolling wheels ensures that the distances from multiple rolling wheels to the axis of the armor layer decrease sequentially along the cable traction direction. Furthermore, the gradient of the distances from multiple rolling wheels to the axis of the armor layer can be finely adjusted to adapt to metal armor layers of different materials and thicknesses. This improves the smoothness of the spiral pattern forming of the armor layer and mitigates the problem of uneven grooves or even cracks on the armor layer surface caused by a single rolling pass of the rolling cutter forming a spiral pattern.

[0014] Optionally, a plurality of guide rods are fixedly arranged on the rotating disk, and the plurality of guide rods correspond one-to-one with a plurality of rolling columns. The length direction of the guide rods is arranged along the length direction of the corresponding rolling column. The rolling column is slidably sleeved on the rolling column. The rotating disk is provided with a drive mechanism for driving the rolling column to move toward the cable.

[0015] By adopting the above technical solution, when it is necessary to corrugate the armor layer of the cable, the drive mechanism drives the rolling column to slide along the guide rod, thereby bringing the rolling roller on the rolling column into contact with the armor layer of the cable. Then, the corrugating drive component is activated to pull the cable. At this time, the drive mechanism continues to drive the rolling column to move closer to the cable, so that the rolling roller rolls the armor layer. The guide rod guides the direction of the rolling column movement driven by the drive component and improves the stability of the rolling column movement.

[0016] Optionally, the driving mechanism includes a helical gear fixedly mounted on a rotating disk, a driving ring movably sleeved on the helical gear, and a driving assembly for driving the driving ring to rotate. The inner circumferential wall of the driving ring meshes with the outer wall of the helical gear, and the end face of the driving ring near the cable abuts against one end of the roller. The helical gear is fixedly sleeved on the end of the guide rod away from the cable.

[0017] By adopting the above technical solution, when it is necessary to corrugate the armor layer of the cable, before starting the corrugating drive, the drive ring is first driven by the drive assembly to rotate along the teeth of the helical gear. When the drive ring rotates along the teeth of the helical gear, it moves towards the cable along the inclined teeth of the helical gear. Then, the corrugating drive is started and the cable is pulled. At this time, the drive assembly continues to drive the drive ring to rotate along the teeth of the helical gear, so that the rolling wheel rolls the armor layer. When the rolling wheel moves to a pre-set depth, the ratio of the rotation speed of the rotating disk to the cable traction speed is adjusted to a preset value, so that multiple rolling wheels roll the spiral pattern multiple times, which improves the smoothness of the spiral pattern formation of the armor layer and improves the problem of uneven corrugation or even cracks on the armor layer surface caused by the rolling cutter forming a spiral pattern in one rolling process.

[0018] Optionally, the guide plate is slidably disposed on the mounting frame along the length of the cable. The drive assembly includes a drive rod fixed on the outer wall of the drive ring, an abutment rod disposed perpendicular to the surface of the guide plate, and a lubricant for movably abutting against the guide plate. One end of the abutment rod is fixedly connected to the end of the drive rod away from the drive ring. The lubricant is disposed at the end of the abutment rod away from the drive rod. The drive rod and the abutment rod are disposed at an obtuse angle.

[0019] By adopting the above technical solution, when the drive ring needs to rotate, the guide disc is driven to move towards the rotating disk. The guide disc pushes the abutment rod through the lubricating component, and the movement of the abutment rod drives the drive rod to rotate around the helical gear, causing the drive ring to move towards the cable. At the same time, the abutment rod, lubricating component, and drive rod all move towards the cable. When the rotating disk rotates, the lubricating component moves on the guide disc, reducing the friction between the guide disc and the drive rod, thus improving the service life of the guide disc and the drive rod.

[0020] Optionally, the rotating disk has a plurality of sliding holes vertically formed on its surface, and each sliding hole corresponds to a plurality of rolling pins. The length direction of the sliding hole is parallel to the length direction of the corresponding rolling pin. An adjusting pin is slidably disposed in each sliding hole, and one end of the adjusting pin is fixedly disposed to the end of the helical gear away from the guide rod.

[0021] An adjusting plate is detachably fixed to the side of the rotating disk away from the guide plate. The adjusting plate has multiple adjusting grooves on its end face near the rotating disk. The multiple adjusting grooves are distributed radially along the rotating disk. The end of the adjusting column away from the helical gear extends into the adjusting groove.

[0022] By adopting the above technical solution, when the diameters of different types of cables requiring corrugation vary significantly, the driving adjustment column is inserted into different adjustment slots arranged radially along the adjustment disc. Then, the adjustment disc is fixed on the rotating disc, thereby adjusting the helical gear fixed on the adjustment column to a suitable position radially along the rotating disc, completing the coarse adjustment process of the position of the corrugating wheel. Finally, the position of the corrugating wheel is finely adjusted by the guide disc and the adjustment assembly. Under the combined action of the adjustment disc, adjustment column, adjustment assembly, and drive assembly, the corrugating wheel can be adapted to the corrugating process of the armor layer on different cables with large diameter variations.

[0023] Optionally, an anti-detachment plate is fixed to one end of the guide rod near the corresponding rolling wheel, and an adjustment cavity is provided inside the rolling column for the anti-detachment plate to slide.

[0024] By adopting the above technical solution, when it is necessary to adjust the position of the rolling column, the rolling column slides on the guide rod along the length direction of the guide rod. At this time, the anti-detachment plate slides in the adjustment cavity, which avoids the rolling column from slipping off the guide rod when the rotating disk rotates at a slow speed, thereby improving the stability of the rolling process.

[0025] Optionally, the end of the anti-detachment piece away from the corresponding rolling roller is provided with a clamping elastic element for driving the rolling column to press against the drive ring.

[0026] By adopting the above technical solution, when it is necessary to roll the armor layer of the cable, the clamping elastic element presses the rolling column against the drive ring, thereby minimizing the shaking of the rolling column on the guide column and further improving the stability of the rolling process.

[0027] Secondly, this application provides a fire-resistant cable production line, which adopts the following technical solution:

[0028] A fire-resistant cable production line includes a plastic extrusion device, a conveying device, a wrapping device, an armor forming device, a three-roller corrugating system for fire-resistant cables, a protective layer extrusion device, and a winding device arranged in sequence. The armor forming device is used to roll a metal sheet to cover the filler layer and to weld the rolled metal sheet.

[0029] By adopting the above technical solution, firstly, a plastic insulation layer is extruded onto the conductor using a plastic extrusion device, and the insulation layer wraps around the conductor to provide insulation. Then, the conductor wrapped with the insulation layer is transported to the wrapping device by a conveying device for wrapping with fire-retardant material and winding with mica tape. Next, a metal sheet is rolled up and wrapped around the filler layer by an armor forming device, and the rolled metal sheet is welded to form an armor layer. Finally, polyethylene or polyvinyl chloride is extruded and wrapped around the armor layer by a protective layer extrusion device to form an insulating protective layer to protect the cable. Finally, the cable is wound up by a winding device.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. Multiple rolling rollers perform progressive rolling on the spiral pattern along the traction direction of the cable, so that the spiral pattern of the armor layer is formed through multiple short-stroke rolling processes, which improves the smoothness of the spiral pattern formation of the armor layer and improves the problem of uneven rolling or even cracks on the surface of the armor layer caused by the rolling cutter forming the spiral pattern in one rolling process.

[0032] 2. The combined action of the adjusting disc, adjusting column, adjusting assembly, and driving assembly enables the rolling roller to be suitable for the texturing process of armor layers on cables with large diameter variations;

[0033] 3. Fire-resistant cables are produced through the combined action of a plastic extrusion unit, a conveying unit, a wrapping unit, an armor forming unit, a three-roller corrugating system, a protective layer extrusion unit, and a winding unit. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of a fireproof cable production line.

[0035] Figure 2 This is a schematic diagram of the overall structure of the three-roller corrugated system for fire-resistant cables.

[0036] Figure 3 This is an exploded view of the guide plate, rotating plate, adjusting plate, guide cylinder, fixing cylinder, fixing bolt, rolling column, rolling wheel, adjusting column and rolling plate in the embodiments of this application.

[0037] Figure 4 This is an exploded view of the rolling column, rolling wheel, rolling plate, adjusting assembly, driving mechanism, guide rod, anti-detachment plate and clamping elastic element in the embodiments of this application.

[0038] Figure 5 It is a structural diagram used to show the drive assembly, drive ring, elastic ring and tightening bolt.

[0039] Reference numerals: 1. Plastic extrusion device; 2. Conveying device; 3. Wrapping device; 4. Armor forming device; 5. Protective layer extrusion device; 6. Winding device; 7. Drive mechanism; 71. Helical gear; 72. Drive ring; 73. Drive assembly; 731. Drive rod; 7311. L-shaped block; 7312. Drive block; 732. Abutment rod; 733. Lubricating component; 8. Adjusting assembly; 81. Adjusting rod; 82. Adjusting nut; 9. Clamping port; 10. Mounting frame; 11. Drive plate; 12. Guide plate; 13. Mounting 14. Fixed plate; 15. Threaded cylinder; 16. Connecting cylinder; 17. Guide plate; 18. Rotating plate; 19. Adjusting plate; 20. Fixed cylinder; 21. Fixing bolt; 22. Guide column; 23. Rotary motor; 24. Rolling drive component; 25. Guide cylinder; 26. Adjusting groove; 27. Sliding hole; 28. Adjusting column; 29. ​​Rolling plate; 30. Rolling column; 31. Accommodating groove; 32. Rolling wheel; 33. Adjusting hole; 34. Anti-detachment plate; 35. Guide rod; 36. Clamping elastic component; 37. Elastic ring; 38. Tightening bolt. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0041] This application discloses a fire-resistant cable production line. (Refer to...) Figure 1 A fire-resistant cable production line includes a plastic extrusion device 1, a conveying device 2, a wrapping device 3, an armor forming device 4, a three-roller corrugated system for fire-resistant cables, a protective layer extrusion device 5, and a winding device 6 arranged sequentially. First, the plastic extrusion device 1 extrudes a plastic insulation layer onto the conductor, wrapping the conductor and providing insulation. Then, the conveying device 2 transports the conductor with the insulation layer to the wrapping device 3 for fire-resistant material coating and mica tape winding. Next, the armor forming device 4 rolls a metal sheet to wrap around the filler layer and welds the rolled metal sheet to form an armor layer. Finally, the protective layer extrusion device 5 extrudes polyethylene or polyvinyl chloride onto the armor layer to form an insulating protective layer to protect the cable.

[0042] Reference Figure 2The three-roller corrugated system for fire-resistant cables includes a mounting frame 10. Along the cable traction direction, the mounting frame 10 is sequentially and parallelly equipped with a drive plate 11, a guide plate 12, a mounting plate 13, a guide disc 17, a rotating disc 18, an adjusting disc 19, and a fixing plate 14. The drive plate 11, guide plate 12, mounting plate 13, and fixing plate 14 are all fixed to the end of the mounting frame 10 furthest from the ground. A threaded cylinder 15 is rotatably connected to the drive plate 11. The threaded cylinder 15 is driven to rotate by a rotary motor 23 via a belt drive. A connecting cylinder 16, threadedly connected to the threaded cylinder 15, is slidably mounted on the guide plate 12 along the cable traction direction. The end of the connecting cylinder 16 furthest from the threaded cylinder 15 passes through the mounting plate 13 and is coaxially and fixedly connected to the guide disc 17. Two guide posts 22 are provided on the mounting plate 13, and the guide disc 17 is slidably fitted onto the two guide posts 22. When the rotary motor 23 is started, the rotary motor 23 drives the threaded cylinder 15 to rotate. The rotation of the threaded cylinder 15 drives the connecting cylinder 16 and the guide plate 17 to move towards or away from the mounting plate 13, thereby completing the sliding drive process of the guide plate 17.

[0043] Reference Figure 2 A fixed cylinder 20 is rotatably connected to a fixed plate 14. A rotating disk 18 is coaxially fixed to the end of the fixed cylinder 20 away from the fixed plate 14. An adjusting disk 19 is slidably sleeved on the fixed cylinder 20 and is detachably embedded in the guide disk 17 by a fixing bolt 21. The fixing bolt 21 passes through the arcuate circumferential wall of the rotating disk 18 and is threadedly connected to the circumferential wall of the adjusting disk 19. A riveting drive component 24 for driving the rotating disk 18 to rotate is provided on the ground. In this embodiment, the riveting drive component 24 is set as a servo motor. The servo motor drives the fixed cylinder 20 to rotate through belt drive, thereby driving the rotating disk 18 to rotate. The drive plate 11, threaded cylinder 15, guide plate 12, connecting cylinder 16, mounting plate 13, guide disk 17, rotating disk 18, adjusting disk 19, fixed cylinder 20, and fixed plate 14 are all sleeved on a cable.

[0044] Reference Figure 3 Multiple sliding holes 27 are vertically formed on the surface of the rotating disk 18. The length direction of the sliding holes 27 is arranged radially along the rotating disk 18. In this embodiment, three sliding holes 27 are provided, and the three sliding holes 27 are evenly distributed on the rotating disk 18. Three adjusting grooves 26 are formed on the end face of the adjusting disk 19 near the rotating disk 18. The adjusting grooves 26 are set in a ring shape and are arranged radially along the rotating disk 18. Adjusting posts 28 that are slidably connected to the sliding holes 27 and are adapted to be movably inserted into the adjusting grooves 26 are slidably connected. The adjusting posts 28 are set in a cylindrical shape and their diameter is the same as the width of the adjusting grooves 26. A rolling plate 29 is fixedly connected to the end of the adjusting post 28 away from the rotating disk 18. The length direction of the rolling plate 29 is perpendicular to the surface of the rotating disk 18, and its plate surface is perpendicular to the radial direction of the rotating disk 18. The length dimension of the three rolling plates 29 increases sequentially along the circumference of the rotating disk 18.

[0045] Reference Figure 3 and Figure 4 Rolling plates 29 are provided with rolling columns 30. The length direction of the rolling columns 30 is parallel to the radial direction of the rotating disk 18. The three rolling columns 30 are evenly spaced along the circumference of the cable, and the three rolling wheels 32 are sequentially spaced along the length of the cable. The end of the rolling column 30 away from the rolling plate 29 is rotatably connected to a rolling wheel 32 for corrugating the armor layer on the cable. The rolling wheel 32 is set perpendicular to the cable. The three rolling wheels 32 are evenly spaced along the circumference of the cable, and the three rolling wheels 32 are sequentially spaced along the length of the cable. The distance from the three rolling wheels 32 to the cable axis decreases sequentially along the direction of cable traction. When it is necessary to corrugate the armor layer on the cable, the distance from the end of the rolling wheel 32 closest to the cable armor layer to the cable axis is less than the radius of the cable.

[0046] When the diameters of different types of cables that require corrugation vary significantly, the driving adjustment column 28 is inserted into different adjustment slots 26 arranged radially along the adjustment plate 19, and then the adjustment plate 19 is fixed on the rotating plate 18, so that the corrugating roller 32 can be used to abut and corrugate the armor layer of cables with different diameters.

[0047] Simultaneously, to ensure stable guidance of cables of different diameters, refer to Figure 3 Guide cylinders 25 are threadedly connected to the adjacent end faces of the rotating disk 18 and the guide disk 17. Both guide cylinders 25 have flanges on their adjacent end faces, and are coaxially sleeved on the cable. When stable guidance of cables of different diameters is required, the guide cylinders 25 are unscrewed from the rotating disk 18 and the guide disk 17, and replaced with guide cylinders 25 whose inner diameter matches the diameter of the cable, thus providing adaptive guidance for cables of different diameters.

[0048] The rolling mill 30 is equipped with an adjusting assembly 8 for adjusting the movement of the rolling roller 32 toward or away from the cable. (See reference...) Figure 4 The rolling column 30 has a receiving groove 31 at one end near the cable. The receiving groove 31 is open on both sides along the length of the cable. The rolling wheel 32 is rotatably disposed in the receiving groove 31. Two adjusting holes 33 are correspondingly provided on the inner walls of both sides of the receiving groove 31. The length direction of the two adjusting holes 33 is along the length direction of the rolling column 30. The adjusting assembly 8 includes adjusting rods 81 with the two adjusting holes 33 passing through their respective ends, and adjusting nuts 82 threadedly connected to the two ends of the adjusting rods 81. The two adjusting nuts 82 are movably abutting against the outer walls of both sides of the rolling column 30. The rolling wheel 32 is rotatably connected to the adjusting rods 81.

[0049] When it is necessary to gradually increase the rolling depth of the armor layer by the rolling rollers 32 on different rolling plates 29, the adjusting nut 82 is driven to move away from the other adjusting nut 82. Then, the adjusting rod 81 is driven to slide along the length of the rolling column 30 within the adjusting hole 33. When the rolling roller 32 moves to the appropriate position within the receiving groove 31 along with the adjusting rod 81, the adjusting nut 82 is driven to move until it abuts against the outer wall of the rolling column 30, thereby completing the adjustment of the position of the rolling roller 32. Adjusting the positions of the three rolling rollers 32 makes the distance from the three rolling rollers 32 to the axis of the armor layer decrease sequentially along the traction direction of the cable. It also allows for fine-tuning of the distance gradient from multiple rolling rollers 32 to the axis of the armor layer, achieving a smooth transition of the rolling pattern of the armor layer by the three rolling rollers 32.

[0050] Reference Figure 4 A guide rod 35 is fixedly connected to the rolling plate 29. The guide rod 35 is square rod shaped and its length direction is parallel to the radial direction of the rotating disk 18. The three guide rods 35 correspond one-to-one with the three rolling columns 30. The rolling columns 30 are slidably sleeved on the guide rods 35. The rotating disk 18 is provided with a drive mechanism 7 for driving the rolling columns 30 to move toward the cable.

[0051] Reference Figure 4 The drive mechanism 7 includes a helical gear 71 fixedly mounted on the rolling plate 29, a drive ring 72 movably sleeved on the helical gear 71, and a drive assembly 73 for driving the drive ring 72 to rotate. The inner circumferential wall of the drive ring 72 meshes with the outer wall of the helical gear 71, and the end face of the drive ring 72 near the cable abuts against one end of the rolling column 30. The helical gear 71 is fixedly sleeved on the end of the guide rod 35 away from the cable.

[0052] Reference Figure 4 The drive assembly 73 includes a drive rod 731 fixed on the outer wall of the drive ring 72, an abutment rod 732 disposed perpendicular to the surface of the guide disk 17, and a lubricant 733 for movably abutting against the guide disk 17. One end of the abutment rod 732 is fixedly connected to the end of the drive rod 731 away from the drive ring 72, and the lubricant 733 is disposed at the end of the abutment rod 732 away from the drive rod 731. The drive rod 731 and the abutment rod 732 are disposed at an obtuse angle.

[0053] Reference Figure 4 and Figure 5 In this embodiment, the lubricating element 733 is configured as a roller. The roller is rotatably connected to the end of the abutment rod 732 away from the drive rod 731 and is in movable contact with the guide disk 17. The roller is arranged perpendicular to the surface of the guide disk 17, and the straight line connecting the point where the roller contacts the guide disk 17 and the center of the guide disk 17 forms a 45-degree angle with the projection of the roller's rotation axis on the guide disk 17.

[0054] In other embodiments, the lubricant 733 is configured as a hemispherical block, the hemispherical surface of which is in movable contact with the guide disk 17, and the circular plane of the hemispherical block is fixedly attached to the end face of the abutment rod 732 away from the drive rod 731.

[0055] When it is necessary to drive the rolling roller 32 to roll, the guide plate 17 is driven to move towards the rotating plate 18. The guide plate 17 pushes the abutment rod 732 through the roller. The movement of the abutment rod 732 drives the drive rod 731 to rotate around the helical gear 71, so that the drive ring 72 moves towards the direction closer to the cable. At the same time, the abutment rod 732, the lubricating element 733 and the drive rod 731 all move towards the direction closer to the cable. The drive ring 72 pushes the rolling column 30 towards the direction closer to the cable, so that the rolling roller 32 moves towards the cable to roll the armor layer of the cable.

[0056] During use, the drive ring 72 is prone to wear due to friction with the helical gear 71. To facilitate the maintenance and replacement of the drive ring 72, refer to... Figure 5 The drive ring 72 is covered with an elastic ring 37. The arc-shaped peripheral wall of the elastic ring 37 is provided with a clamping opening 9. The drive rod 731 includes an L-shaped block 7311 and a drive block 7312, which are respectively fixed to both ends of the clamping opening 9 of the elastic ring 37. The drive block 7312 is embedded in the bend of the L-shaped block 7311. The end of the abutting rod 732 away from the guide plate 17 is fixedly connected to the bend of the L-shaped block 7311. A tightening bolt 38 threaded through the drive block 7312 and threadedly connected to the L-shaped block 7311 is provided. When the tightening bolt 38 clamps the drive block 7312 and the L-shaped block 7311, the inner peripheral wall of the elastic ring 37 clamps against the outer peripheral wall of the drive ring 72.

[0057] To improve the stability of the rolling mill 30 during the rolling of the armor layer, refer to Figure 2 An anti-detachment plate 34 is fixed to one end of the guide rod 35 near the corresponding rolling roller 32, and an adjustment cavity for sliding the anti-detachment plate 34 is provided inside the rolling column 30. A pressing elastic element 36 is provided at the end of the anti-detachment plate 34 away from the corresponding rolling roller 32 to drive the rolling column 30 against the drive ring 72. The pressing elastic element 36 can be a compression spring or an elastic telescopic cylinder. In this embodiment, the pressing elastic element 36 is a compression spring, with one end fixedly connected to the anti-detachment plate 34 and the other end fixedly connected to the inner wall of the adjustment cavity near the rolling plate 29.

[0058] The implementation principle of a fireproof cable production line according to an embodiment of this application is as follows: First, a plastic insulation layer is extruded outside the conductor through a plastic extrusion device 1, and the insulation layer wraps around the conductor to insulate it; then, the conductor wrapped with the insulation layer is transported to the wrapping device 3 through a conveying device 2 for wrapping with fireproof material and winding with mica tape; then, a metal sheet is rolled up and wrapped around the filler layer through an armor forming device 4, and the rolled metal sheet is welded to form an armor layer.

[0059] When a cable with an armor layer passes through a three-roller corrugating system for fire-resistant cables, the position of the rollers 32 is coarsely adjusted by the adjusting column 28 according to the thickness of the cable, and then the position of the three rollers 32 is adjusted by the adjusting assembly 8.

[0060] Before starting the rolling drive 24, start the rotary motor 23 to drive the guide plate 17 to push the drive ring 72 to rotate along the teeth of the helical gear 71. When the drive ring 72 rotates along the teeth of the helical gear 71, the drive ring 72 moves towards the cable along the inclined teeth on the helical gear 71. The movement of the drive ring 72 pushes the rolling column 30 to slide along the guide rod 35, thereby bringing the rolling roller 32 on the rolling column 30 into contact with the armor layer of the cable.

[0061] Finally, the servo motor is started and the cable is pulled. At this time, the guide plate 17 continues to push the drive ring 72 to rotate along the tooth pattern of the helical gear 71, so that the rolling roller 32 rolls the armor layer. When the rolling roller 32 moves to the preset depth, the speed ratio of the rotating plate 18 to the cable pulling speed is adjusted to the preset value, so that the three rolling rollers 32 roll the spiral pattern multiple times, which improves the smoothness of the spiral pattern forming of the armor layer.

[0062] After the armor layer is corrugated, polyethylene or polyvinyl chloride is extruded and wrapped around the armor layer through the protective layer extrusion device 5 to form an insulating protective layer to protect the cable; and the fire-resistant cable is wound up by the winding device 6.

[0063] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A three-roller corrugating system for fire-resistant cables, characterized in that: The system includes a mounting frame (10), on which are provided a rotating disk (18) for mounting on the cable, a crimping drive (24) for driving the rotating disk (18) to rotate, and a guide disk (17) for guiding the cable. The guide disk (17) is arranged parallel to the rotating disk (18). The rotating disk (18) is provided with a plurality of crimping rollers (32) for crimping the armor layer. The plurality of crimping rollers (32) are arranged at intervals along the circumference of the cable and at intervals along the length of the cable. The distance of the plurality of crimping rollers (32) from the cable axis decreases sequentially along the direction of cable traction. When it is necessary to crimp the armor layer on the cable, the distance from the end of the crimping roller (32) closest to the cable armor layer to the cable axis is less than the radius of the cable. The rotating disk (18) is provided with a rolling column (30) for mounting the rolling wheel (32). The rolling wheel (32) is rotatably mounted on the rolling column (30) at one end near the cable. Multiple rolling columns (30) are arranged at intervals along the circumference of the cable. The rolling column (30) is provided with an adjustment component (8) for adjusting the movement of the rolling wheel (32) toward or away from the cable. The rolling column (30) has a receiving groove (31) at one end near the cable. The rolling wheel (32) is installed in the receiving groove (31). Two adjustment holes (33) are correspondingly opened on the inner walls of both sides of the receiving groove (31). The length direction of the two adjustment holes (33) is set along the length direction of the rolling column (30). The adjustment assembly (8) includes an adjustment rod (81) with the two adjustment holes (33) respectively passing through its two ends and an adjustment nut (82) threaded to both ends of the adjustment rod (81). The adjustment nuts (82) are in movable contact with the outer wall of the rolling column (30). The rolling wheel (32) is rotatably connected to the adjustment rod (81). Multiple guide rods (35) are fixedly arranged on the rotating disk (18). Each guide rod (35) corresponds to a multiple rolling column (30). The length direction of the guide rod (35) is arranged along the length direction of the corresponding rolling column (30). The rolling column (30) is slidably sleeved on the guide rod (35). The rotating disk (18) is provided with a drive mechanism (7) for driving the rolling column (30) to move toward the cable.

2. The three-roller corrugating system for fire-resistant cables according to claim 1, characterized in that: The drive mechanism (7) includes a helical gear (71) disposed on a rotating disk (18), a drive ring (72) movably sleeved on the helical gear (71), and a drive assembly (73) for driving the drive ring (72) to rotate. The inner circumferential wall of the drive ring (72) meshes with the outer wall of the helical gear (71), and the end face of the drive ring (72) near the cable abuts against one end of the roller (30). The helical gear (71) is fixedly sleeved on the end of the guide rod (35) away from the cable.

3. The three-roller corrugating system for fire-resistant cables according to claim 2, characterized in that: The guide plate (17) is slidably disposed on the mounting frame (10) along the length direction of the cable. The drive assembly (73) includes a drive rod (731) fixed on the outer wall of the drive ring (72), an abutment rod (732) disposed perpendicular to the surface of the guide plate (17), and a lubricant (733) for movably abutting against the guide plate (17). One end of the abutment rod (732) is fixedly connected to the end of the drive rod (731) away from the drive ring (72). The lubricant (733) is disposed at the end of the abutment rod (732) away from the drive rod (731). The drive rod (731) and the abutment rod (732) are disposed at an obtuse angle.

4. The three-roller corrugating system for fire-resistant cables according to claim 2, characterized in that: The rotating disk (18) has a plurality of sliding holes (27) vertically opened on its surface. Each sliding hole (27) corresponds to a plurality of rolling pins (30). The length direction of the sliding hole (27) is parallel to the length direction of the corresponding rolling pin (30). An adjusting pin (28) is slidably arranged in each sliding hole (27). One end of the adjusting pin (28) is fixedly arranged with the end of the helical gear (71) away from the guide rod (35). An adjusting disk (19) is detachably fixed on the side of the rotating disk (18) away from the guide disk (17). The end face of the adjusting disk (19) near the rotating disk (18) has a plurality of adjusting grooves (26). The plurality of adjusting grooves (26) are radially distributed along the rotating disk (18). The end of the adjusting pin (28) away from the helical gear (71) extends into the adjusting groove (26).

5. The three-roller corrugating system for fire-resistant cables according to claim 2, characterized in that: The guide rod (35) has an anti-detachment piece (34) fixed at one end near the corresponding roller (32), and the roller (30) has an adjustment cavity for the anti-detachment piece (34) to slide.

6. The three-roller corrugating system for fire-resistant cables according to claim 5, characterized in that: The anti-detachment piece (34) is provided with a retaining elastic element (36) at the end away from the corresponding roller (32) for driving the roller (30) to press against the drive ring (72).

7. A fire-resistant cable production line, characterized in that: The device includes a plastic extrusion device (1), a conveying device (2), a wrapping device (3), an armor forming device (4), a three-roller corrugated system for fireproof cables as described in any one of claims 1-6, a protective layer extrusion device (5), and a winding device (6), wherein the armor forming device (4) is used to roll the metal sheet to cover the filler layer and to weld the rolled metal sheet.

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