A copper-clad aluminum steel rail lead wire and a stranding process thereof

Abstract

This invention provides a copper-clad aluminum rail lead wire and its stranding process, comprising a steel wire core with two layers of copper-clad aluminum stranded conductors stranded on the outer side. The copper-clad aluminum stranded conductors are composed of multiple copper-clad aluminum monofilaments stranded into a single strand. This composite structure of "steel wire core + outer copper-clad aluminum stranded conductor" replaces the traditional mixed steel and copper wire structure. The copper-clad aluminum monofilaments are lightweight and flexible; after being stranded with the central steel wire core, the overall cable flexibility is far superior to traditional structures, solving the problem of excessively stiff wire in existing products. This makes the rail lead wire easier to bend, handle, and install on-site, improving construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of rail lead wires, and in particular relates to a copper-clad aluminum rail lead wire and its stranding process. Background Technology

[0002] In rail transit signaling systems, rail lead wires are used to connect rails to signaling equipment to transmit track circuit signals. In existing technology, the conductor structure of rail lead wires is typically a stranded combination of steel and copper wires. For example... Figure 3 As shown, the black portion represents steel wire, and the white portion represents copper wire. Since steel and copper wires are two different metals, gaps inevitably form between them during the stranding process. This structure results in a larger outer diameter of the entire rail lead wire conductor and a generally stiffer wire. In use, especially in space-constrained trackside environments, this overly stiff lead wire is difficult to bend, causing numerous inconveniences for on-site handling and installation. Summary of the Invention

[0003] In view of this, the present invention aims to propose a copper-clad aluminum rail lead wire and its stranding process to solve the technical problems of existing rail lead wires, such as large wire diameter, excessively stiff wire body, and difficulty in bending and installation, caused by conductor structure issues.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows: In one aspect, a copper-clad aluminum rail lead wire is provided, comprising a steel wire core, with two layers of copper-clad aluminum stranded conductors twisted on the outside of the steel wire core, wherein the copper-clad aluminum stranded conductors are stranded into a whole strand by twisting multiple copper-clad aluminum monofilaments.

[0005] Furthermore, the copper-clad aluminum stranded conductor has a first layer and a second layer distributed on the outside of the steel wire core, and the number of copper-clad aluminum stranded conductor strands in the first layer is less than the number of copper-clad aluminum stranded conductor strands in the second layer.

[0006] Furthermore, the first layer has 16 copper-clad aluminum stranded conductor strands, and the second layer has 22 copper-clad aluminum stranded conductor strands.

[0007] Furthermore, the second layer of copper-clad aluminum stranded conductor is wrapped with an insulating layer on the outside, and the insulating layer is wrapped with an outer sheath on the outside.

[0008] Secondly, a process for stranding copper-clad aluminum steel rail lead wires is provided, including the following steps: The first step is to pass the steel wire cores released by the wire feeding roller through the steel wire degreasing and cleaning device in sequence. The two wiping units of the steel wire degreasing and cleaning device wipe the surface of the steel wire cores and absorb the oil on the surface of the steel wire cores. When the wiping unit needs to remove oil, one wiping unit continues to wipe the steel wire cores, while the other wiping unit stops wiping and actively cleans the oil it has absorbed. The second step involves using a fork-and-skewer machine to strand multiple copper-clad aluminum stranded conductors onto the surface of the steel wire core, forming the first layer of copper-clad aluminum stranded conductors. The third step involves using a fork-and-skewer machine to strand multiple copper-clad aluminum stranded conductors onto the outside of the first layer of copper-clad aluminum stranded conductors, forming the second layer of copper-clad aluminum stranded conductors.

[0009] Furthermore, the steel wire degreasing and cleaning device in the step includes a cleaning tank and an adjusting component. Support platforms are fixedly connected to both sides of the inner wall of the cleaning tank. Movable seats are slidably mounted on both support platforms, and two wiping units are mounted on the two movable seats. Each wiping unit includes two mounting platforms symmetrical with respect to the steel wire core. The two mounting platforms are slidably connected to the two movable seats. The adjusting component is used to adjust the distance between the two mounting platforms in the same wiping unit. Oil-absorbing felt is clamped on the mounting platforms, and an active squeezing component is provided on the mounting platforms. The active squeezing component actively presses against the oil-absorbing felt during the process of the adjusting component widening the distance between the two mounting platforms in the same wiping unit, thereby accelerating oil drainage.

[0010] Furthermore, the adjustment assembly includes two adjustment slots, two clearance slots, and a threaded drive assembly. The two adjustment slots are respectively opened on two support platforms. The adjustment slots include a first straight slot and two first inclined slots. The two clearance slots are respectively opened on two movable seats. The two movable seats are respectively slidably connected to the bottom of two mounting platforms in the same wiping unit. Each of the two first straight slots is provided with an adjustment pin. After passing through the clearance slot, the adjustment pin is fixedly connected to the bottom of the mounting platform at the corresponding position. The threaded drive assembly is set on the support platform and is used to drive the movable seats to move on the support platform.

[0011] Furthermore, the threaded drive assembly includes a threaded sleeve, which is fixedly connected to the bottom of the movable base. A drive screw is threadedly connected to the threaded sleeve, and mounting seats are rotatably connected to both ends of the drive screw. The mounting seats are fixedly connected to the ends of the support platform, and a first motor is provided at each end of the two drive screws. The first motor is fixedly mounted on the mounting seat.

[0012] Furthermore, the active extrusion assembly includes an embedding groove, which is formed on the surface of the mounting platform. An oil-absorbing felt is embedded in the embedding groove, and a top pressure block is slidably disposed in the embedding groove. The end face of the top pressure block contacts the oil-absorbing felt. Two top rods are fixedly connected to the side of the top pressure block away from the oil-absorbing felt. The two top rods pass through the mounting platform and extend to the outside of the mounting platform. A bracket is fixedly connected to the end of the two top rods away from the mounting platform. A ball bearing is movably embedded at the end of the bracket. A support spring is sleeved on the surface of each of the two top rods. The two ends of the support spring are fixedly connected to the bracket and the mounting platform, respectively.

[0013] Furthermore, the mounting platform is provided with a clamping assembly for firmly clamping the oil-absorbing felt. The clamping assembly includes a clamping seat, a connecting seat, and two pairs of support pins. The clamping seat is set in an embedded groove and has a receiving groove. The clamping seat is sleeved on the surfaces of the two top rods and is sleeved on the surface of the top pressure block through the receiving groove. The two pairs of support pins are respectively fixedly connected to the two ends of the clamping seat. Clamping plates are sleeved on the surfaces of the two pairs of support pins. The connecting seat is fixedly connected to the top of the mounting platform. A bidirectional screw is rotatably connected to the connecting seat, and the two ends of the bidirectional screw are respectively threaded to the two clamping plates.

[0014] Compared with the prior art, the copper-clad aluminum rail lead wire and its stranding process described in this invention have the following advantages: (1) The copper-clad aluminum rail lead wire of the present invention adopts a composite structure of "steel wire core + outer copper-clad aluminum stranded conductor" to replace the traditional steel wire and copper wire mixed stranded structure. The copper-clad aluminum monofilament has the characteristics of being lightweight and soft. After being stranded with the central steel wire core, the overall cable flexibility is far superior to the traditional structure, which solves the problem of the excessive stiffness of the existing product line. This makes the rail lead wire easier to bend, transport and install on site, and improves construction efficiency.

[0015] (2) The copper-clad aluminum rail lead wire of the present invention, by setting a first layer and a second layer of copper-clad aluminum stranded conductors, and the number of strands in the first layer (e.g., 16 strands) is less than the number of strands in the second layer (e.g., 22 strands), makes the conductor structure more compact and the stress distribution more uniform. On the one hand, it optimizes the stranding density and cable roundness, which is conducive to the uniform covering of the subsequent insulation layer and outer sheath. On the other hand, the steel wire core becomes a single strand, which, compared with the multiple steel wires in the prior art, removes the gaps and helps to reduce the outer diameter of the entire rail lead wire conductor.

[0016] (3) The copper-clad aluminum steel rail lead wire stranding process of the present invention has two wiping units in the steel wire degreasing and cleaning device. While one wiping unit is wiping the steel wire core, the other wiping unit can cancel wiping and perform active oil draining and cleaning, realizing continuous production without stopping the machine and significantly improving production efficiency.

[0017] (4) The copper-clad aluminum steel rail lead wire stranding process described in this invention, through the cooperation of the adjusting components (adjusting groove, moving seat, adjusting pin, etc.) and the active extrusion component, when it is necessary to clean the oil-absorbing felt, drives the moving seat to move the mounting platform towards the inclined groove, the distance between the two mounting platforms increases, the ball bearings on the bracket contact the side wall of the cleaning pool and generate a push, driving the top pressure block to squeeze the oil-absorbing felt, thus achieving efficient oil draining. This structure is easy to operate and drains oil thoroughly.

[0018] (5) In the copper-clad aluminum steel rail lead wire stranding process described in this invention, a second support spring is provided between the clamping body and the adjusting plate in the clamping assembly. When the top pressure block squeezes the oil-absorbing felt, the clamping body and the clamping seat can move relative to the adjusting plate, so that the oil-absorbing felt moves towards the port of the embedding groove. The drained oil can drip directly from the opening of the embedding groove, reducing the oil's residence in the embedding groove and avoiding the problem of being reabsorbed by the oil-absorbing felt. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a process flow diagram of a copper-clad aluminum steel rail lead wire stranding process according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a copper-clad aluminum rail lead wire according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the prior art rail lead wire described in this invention; Figure 4 This is a schematic diagram of the steel wire degreasing and cleaning device and the fork winch described in an embodiment of the present invention; Figure 5 This is a schematic diagram of the fork winch unit of the fork winch according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view of section A in the middle; Figure 8 This is a schematic diagram of the support platform and thread drive assembly of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the support platform of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the movable base and mounting platform of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 11This is a schematic diagram of the structure of the movable base of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 12 This is a cross-sectional view of the mounting platform of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the clamping assembly of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 14 for Figure 13 Enlarged view of section B; Figure 15 This is a schematic diagram of the mounting platform of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 16 This is a schematic diagram of the clamping seat and top pressure block of the steel wire degreasing and cleaning device according to an embodiment of the present invention; Figure 17 This is a schematic diagram of the clamping plate of the steel wire degreasing and cleaning device according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1-Steel wire core; 2-Copper-clad aluminum stranded conductor; 21-First layer; 22-Second layer; 3-Insulation layer; 4-Outer sheath; 5-Cleaning tank; 51-Through hole; 52-Oil drain pipe; 6-Support platform; 61-Adjusting groove; 611-First straight groove; 612-First inclined groove; 7-Moving seat; 71-Leaving through groove; 8-Mounting platform; 81-Embedded groove; 82-Adjusting pin; 9-Oil-absorbing felt; 10-Threaded sleeve; 11-Drive screw; 12-Mounting seat; 13-First motor; 14-Top pressure block; 15-Top rod; 16-Bracket; 17-Ball bearing; 18-Support spring; 19-Clamping seat; 191-Receiving groove; 192-Mating hole; 20-Connecting seat; 201-Double-acting screw; 21a-Support pin ; 22a-Clamping plate; 221-Adjusting plate; 2211-Connecting groove; 2212-Connecting rod; 2213-Second support spring; 222-Clamping body; 2221-Connecting sleeve; 2222-Plug pin; 23-Oil hopper; 24-Guide roller; 25-Base; 251-Rotating spindle; 2511-Channel; 252-Fork-type wire feeding frame; 2521-First wire hole; 2522-Second wire hole; 253-Wire feeding reel; 26-Wire separating reel; 261-Wire separating hole; 27-Wire stranding reel; 271-Wire stranding hole; 28-Support seat; 29-Second motor; 30-Drive wheel; 31-Follower wheel; 32-Synchronous belt; 33-Wire feeding roller; 34-Traction wheel; 35-Wire taking roller; 36-Wire pressing die plate. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figures 2 to 3 As shown, in one embodiment, a copper-clad aluminum rail lead wire includes a steel wire core 1, with two layers of copper-clad aluminum stranded conductors 2 twisted together on the outer side of the steel wire core 1. The copper-clad aluminum stranded conductors 2 are made of multiple copper-clad aluminum monofilaments twisted into a single strand. Copper-clad aluminum monofilaments are lightweight, flexible, and have good conductivity. After being twisted together with the central steel wire core 1, the overall cable's flexibility is far superior to traditional steel-copper mixed stranded structures, facilitating on-site bending and installation.

[0026] In a preferred embodiment, the copper-clad aluminum stranded conductor 2 has a first layer 21 and a second layer 22 distributed on the outside of the steel wire core 1. This double-layer structure can distribute stress more evenly and make the conductor structure more compact. The number of strands of the copper-clad aluminum stranded conductor 2 in the first layer 21 is less than the number of strands in the second layer 22 to optimize the stranding density and roundness. More specifically, the number of strands of the copper-clad aluminum stranded conductor 2 in the first layer 21 can be 16, and the number of strands of the copper-clad aluminum stranded conductor 2 in the second layer 22 can be 22.

[0027] To meet the insulation and protection requirements of the cable, an insulation layer 3 is wrapped around the outside of the second layer 22 copper-clad aluminum stranded conductor 2, and an outer sheath 4 is wrapped around the outside of the insulation layer 3. The insulation layer 3 and the outer sheath 4 can be made of materials such as polyvinyl chloride, polyethylene, or low-smoke halogen-free flame-retardant polyolefin to provide reliable electrical insulation and mechanical protection.

[0028] like Figure 1 As shown, in one embodiment, a copper-clad aluminum rail lead wire stranding process is used to prepare the copper-clad aluminum rail lead wire of Embodiment 1, including the following steps: The first step involves feeding the steel wire cores 1 from the feed roller 33 through the steel wire degreasing and cleaning device. Two wiping units of the device wipe the surface of the passing steel wire cores 1, adsorbing the oil. When the wiping units need to remove oil themselves, one unit can be controlled to continue wiping the steel wire cores 1 while the other unit stops wiping and actively cleans itself of the adsorbed oil, thus achieving continuous cleaning without stopping the machine and improving production efficiency.

[0029] The second step involves using a fork-and-skewer machine to strand multiple copper-clad aluminum stranded conductors 2 onto the surface of the steel wire core 1, forming the first layer 21 of copper-clad aluminum stranded conductors 2.

[0030] The third step involves using a fork-and-spindle machine to twist multiple strands of copper-clad aluminum stranded conductor 2 to the outside of the first layer 21, forming the second layer 22 of copper-clad aluminum stranded conductor 2.

[0031] like Figures 4 to 17 As shown, the steel wire degreasing and cleaning device in the steps includes a cleaning tank 5 and an adjusting component. Support platforms 6 are fixedly connected to both sides of the inner wall of the cleaning tank 5. Movable seats 7 are slidably mounted on each of the two support platforms 6. Two wiping units are mounted on the two movable seats 7. Each wiping unit includes two mounting platforms 8 symmetrically positioned with respect to the steel wire core 1. The two mounting platforms 8 are slidably connected to the two movable seats 7. The adjusting component is used to adjust the distance between the two mounting platforms 8 in the same wiping unit. An oil-absorbing felt cloth 9 is held on the mounting platform 8, and an active squeezing component is provided on the mounting platform 8. The active squeezing component actively presses against the oil-absorbing felt cloth 9 during the process of the adjusting component widening the distance between the two mounting platforms 8 in the same wiping unit, accelerating oil drainage. This design allows for rapid cleaning by widening the distance between the two mounting platforms 8 when the oil-absorbing felt cloth 9 needs to be replaced or cleaned, simultaneously triggering the active squeezing component to squeeze the oil out of the oil-absorbing felt cloth 9 and allow it to fall into the cleaning tank 5.

[0032] like Figures 6 to 11As shown, the adjustment assembly includes two adjustment slots 61, two clearance slots 71, and a threaded drive assembly. The two adjustment slots 61 are respectively formed on two support platforms 6, and each adjustment slot 61 includes a first straight slot 611 and two first inclined slots 612. The two clearance slots 71 are respectively formed on two movable seats 7, and the two movable seats 7 are slidably connected to the bottoms of two mounting platforms 8 in the same wiping unit. Each of the two first straight slots 611 is provided with an adjustment pin 82. The adjustment pin 82 passes through the clearance slot 71 and is fixedly connected to the bottom of the corresponding mounting platform 8. The threaded drive assembly is mounted on the support platform 6 and is used to thread-drive the movable seats 7 to move on the support platform 6. When the movable seat 7... When driven to move, the adjusting pin 82 will move along the trajectory of the adjusting groove 61. When one of the adjusting pins 82 enters the first inclined groove 612 from the first straight groove 611 and moves within the first inclined groove 612, it will be pushed, thereby driving the mounting platform 8 to move and realize the adjustment of the distance between the two mounting platforms 8. It should be noted that when it is necessary to actively clean the oil-absorbing felt 9 on the mounting platform 8, the moving seat 7 is driven. The moving seat 7 drives the mounting platform 8 with the oil-absorbing felt 9 that needs to be actively cleaned to move towards the first inclined groove 612. The adjusting pin 82 on the other mounting platform is still in the first straight groove 611, maintaining the wiping and cleaning of the steel wire core 1.

[0033] like Figure 8 and Figure 10 As shown, the threaded drive assembly includes a threaded sleeve 10, which is fixedly connected to the bottom of the movable base 7. A drive screw 11 is threadedly connected to the threaded sleeve 10, and mounting bases 12 are rotatably connected to both ends of the drive screw 11. The mounting bases 12 are fixedly connected to the ends of the support platform 6. A first motor 13 is provided at the ends of both drive screws 11, and the first motors 13 are fixedly mounted on the mounting bases 12. The two first motors 13 are synchronously controlled by an external controller, and by driving the drive screws 11 to rotate through the first motors 13, the synchronous displacement of the two movable bases 7 can be controlled.

[0034] like Figure 6 , Figure 7 , Figures 12 to 16As shown, the active extrusion assembly includes an embedding groove 81, which is formed on the surface of the mounting platform 8. An oil-absorbing felt 9 is embedded in the embedding groove 81. A top pressure block 14 is slidably disposed in the embedding groove 81. The end face of the top pressure block 14 contacts the oil-absorbing felt 9. Two top rods 15 are fixedly connected to the side of the top pressure block 14 away from the oil-absorbing felt 9. The two top rods 15 pass through the mounting platform 8 and extend to the outside of the mounting platform 8. A bracket 16 is fixedly connected to the end of the two top rods 15 away from the mounting platform 8. A ball bearing 17 is movably embedded at the end of the bracket 16. A support spring 18 is sleeved on the surface of each of the two top rods 15. The two ends of the support spring 18 are fixedly connected to the bracket 16 and the mounting platform 8, respectively. When the distance between the two mounting platforms 8 increases, the ball bearing 17 on the opposite bracket 16 will contact the inner wall of the cleaning tank 5 and push, thereby pushing the top rods 15 and the top pressure block 14 towards the oil-absorbing felt 9, extruding the oil-absorbing felt 9, and realizing active oil draining.

[0035] like Figure 6 , Figure 7 , Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 As shown, the mounting platform 8 is equipped with a clamping assembly for firmly clamping the oil-absorbing felt 9. The clamping assembly includes a clamping seat 19, a connecting seat 20, and two pairs of support pins 21a. The clamping seat 19 is set in the embedding groove 81 and has a receiving groove 191. The clamping seat 19 is sleeved on the surface of the two top rods 15 and is sleeved on the surface of the top pressure block 14 through the receiving groove 191. The two pairs of support pins 21a are respectively fixedly connected to the two ends of the clamping seat 19. Clamping plates 22a are sleeved on the surface of the two pairs of support pins 21a. The connecting seat 20 is fixedly connected to the top of the mounting platform 8. A bidirectional screw 201 is rotatably connected to the connecting seat 20. The two ends of the bidirectional screw 201 are respectively threaded to the two clamping plates 22a. By rotating the bidirectional screw 201, the two clamping plates 22a can be driven to move closer or further away from each other, thereby clamping or releasing the oil-absorbing felt 9.

[0036] Specifically, the clamping plate 22a includes an adjusting plate 221 and a clamping body 222. The adjusting plate 221 is threadedly connected to the surface of the bidirectional screw 201. A connecting groove 2211 is provided on the adjusting plate 221, and a connecting rod 2212 is fixedly connected in the connecting groove 2211. The clamping body 222 is slidably connected to the adjusting plate 221, and a connecting sleeve 2221 is fixedly connected to the surface of the clamping body 222. The connecting sleeve 2221 is sleeved on the surface of the connecting rod 2212. A second support spring 2213 is sleeved on the surface of the connecting rod 2212. The two ends of the second support spring 2213 are fixedly connected to the connecting sleeve 2221 and the inner wall of the connecting groove 2211, respectively. A pin 2222 is fixedly connected to the end of the clamping body 222. A mating hole 192 is provided at both ends of the clamping seat 19 corresponding to the position of the pin 2222, and the pin 2222 is inserted into the mating hole 192. This structure allows the clamping assembly to simultaneously clamp the oil-absorbing felt 9 and fix the clamping seat 19, ensuring the integrity and stability of the structure. Furthermore, the top pressure block 14 moves towards the oil-absorbing felt 9, compressing it. This provides elastic support, gradually increasing the compressive force and reducing damage to the oil-absorbing felt 9. Simultaneously, during the active oil draining process, the clamping body 222 and the clamping seat 19 have relative freedom of movement to the adjusting plate 221, allowing the oil-absorbing felt 9 to move towards the port of the embedding groove 81. This allows the drained oil to drip from the opening of the embedding groove 81, reducing its residence within the groove and preventing the oil remaining in the groove from being reabsorbed by the oil-absorbing felt 9. In addition, a through hole 51 is provided at the end of the cleaning tank 5, through which the steel wire core 1 enters the cleaning tank 5. The oil on the steel wire is initially scraped off as it passes through the through hole 51. An oil collection hopper 23 is provided below the inlet end of the through hole 51, and the oil collection hopper 23 is fixedly connected to the end of the cleaning tank 5. A guide roller 24 is fixedly installed at the top of the oil collection hopper 23, which is used to provide rolling support for the steel wire core 1 about to pass through the through hole 51, reducing friction. The oil scraped off by the through hole 51 drips into the oil collection hopper 23 and then falls into the cleaning tank 5. An oil drain pipe 52 is fixedly connected to the end of the cleaning tank 5 away from the through hole 51, which can collect and drain the oil dripping from the oil-absorbing felt 9 and the collected oil, achieving environmentally friendly and clean production.

[0037] like Figure 4 , Figure 5 and Figure 6As shown, the fork winch includes a pay-off roller 33, a traction wheel 34, a take-up roller 35, a wire pressing die 36, and two fork winch units. Both fork-type stranding units include a base 25, a wire distributor 26, and a stranding reel 27. A rotating spindle 251 is rotatably mounted on the base 25. A channel 2511 is provided through the end of the rotating spindle 251 to provide space for the steel wire core 1 to pass through. Multiple fork-type wire feeders 252 are mounted on the surface of the rotating spindle 251. A wire feeder 253 is rotatably mounted on the fork-type wire feeder 252. The wire distributor 26 is fixedly mounted on the outside of the rotating spindle 251. A support seat 28 is rotatably connected to the outer edge of the wire distributor 26. The support seat 28 is fixedly mounted on the base 25. Multiple wire feed holes 261 are provided on the wire feeder 261. A chamfer is provided on the side of the wire feeder 261 near the fork-type wire feeder 252 to reduce friction between the cable and the wire distributor 26. The stranding reel 27 is fixedly mounted on the outside of the rotating spindle 251. Multiple stranding holes 271 are provided on the stranding reel 27. The two adjacent fork-type cable feeders 252 are staggered, meaning the positions of the cable feed reels 253 on the two adjacent fork-type cable feeders 252 are staggered. This provides a smoother path for the multi-strand copper-clad aluminum stranded conductor 2. The multi-strand copper-clad aluminum stranded conductor 2 is wound on the cable feed reel 253. The multi-strand copper-clad aluminum stranded conductor 2 passes through the gaps on the fork-type cable feeders 252 into the corresponding branching holes 261, and then passes through the branching holes 261 and the stranding holes 271. By rotating the main shaft 251, the cable feed reel 253, branching reel 26, and stranding reel 27 rotate, and cooperate with the wire pressing die 36 to strand the cable. Through the sequential stranding of the two fork-type stranding units, two layers of copper-clad aluminum stranded conductor 2 are stranded on the outside of the steel wire core 1.

[0038] Specifically, a second motor 29 is fixedly installed on the base 25. A drive wheel 30 is fixedly connected to the output end of the second motor 29. A follower wheel 31 is fixedly connected to the surface of the rotating main shaft 251. A synchronous belt 32 is connected between the follower wheel 31 and the drive wheel 30 to provide stable rotational power for the rotating main shaft 251.

[0039] More specifically, the fork-type wire feeder 252 has three first wire holes 2521 and three second wire holes 2522. The first wire holes 2521 are located in the direction of the wire feed reel 253 facing the rotating spindle 251, and the second wire holes 2522 are located between adjacent wire feed reels 253 on the same fork-type wire feeder 252. During the stranding process, the copper-clad aluminum stranded conductor 2 on the wire feed reel 253 closest to the wire feeder will pass through the second wire holes 2522 on the adjacent fork-type wire feeder 252, and the outlet of the first wire hole 2521 on the previous fork-type wire feeder 252 and the inlet of the second wire hole 2522 on the subsequent fork-type wire feeder 252 are aligned. This design allows the copper-clad aluminum stranded conductor 2 to pass through the first wire hole 2521 and the second wire hole 2522 and enter the interior of the branch hole 261. The first wire hole 2521 and the second wire hole 2522 effectively limit and guide the copper-clad aluminum stranded conductor 2, preventing it from shaking or tangling during high-speed rotation and stranding, thus ensuring the stranding quality and stability.

[0040] It should be noted that the traction wheel 34, usually driven by a motor, is the power core of the entire production line. It clamps and pulls the already twisted copper-clad aluminum steel rail lead wire through friction, providing continuous traction for a series of processes such as releasing the steel wire core 1 from the wire feeding roller 33, passing through the steel wire degreasing and cleaning device, and twisting through two fork twisting units.

[0041] The take-up roller 35 is located at the end of the production line. The finished copper-clad aluminum steel rail lead wire, which has been pulled by the traction wheel 34 and has completed all stranding processes and possible post-processing such as coating with an insulation layer, will finally be neatly and tightly wound onto the take-up roller to form a spool that is easy to handle, store and transport.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A copper-clad aluminum rail lead wire, characterized in that: It includes a steel wire core (1), and two layers of copper-clad aluminum stranded conductors (2) are stranded on the outside of the steel wire core (1). The copper-clad aluminum stranded conductors (2) are stranded into a whole strand by multiple copper-clad aluminum monofilaments.

2. The copper-clad aluminum rail lead wire and its stranding process according to claim 1, characterized in that: The copper-clad aluminum stranded conductor (2) has a first layer (21) and a second layer (22) distributed on the outside of the steel wire core (1). The number of copper-clad aluminum stranded conductor (2) in the first layer (21) is less than the number of copper-clad aluminum stranded conductor (2) in the second layer (22).

3. The copper-clad aluminum rail lead wire and its stranding process according to claim 2, characterized in that: The first layer (21) has 16 strands of copper-clad aluminum stranded conductor (2), and the second layer (22) has 22 strands of copper-clad aluminum stranded conductor (2).

4. The copper-clad aluminum rail lead wire and its stranding process according to claim 2, characterized in that: The second layer (22) copper-clad aluminum stranded conductor (2) is wrapped with an insulating layer (3) on the outside, and the insulating layer (3) is wrapped with an outer sheath (4) on the outside.

5. A stranding process for copper-clad aluminum rail lead wires, as described in claim 1, characterized in that: Includes the following steps: Step 1: The wire core (1) released by the wire feeding roller (33) passes through the wire degreasing and cleaning device in sequence. The two wiping units of the wire degreasing and cleaning device wipe the surface of the wire core (1) and absorb the oil on the surface of the wire core (1). When the wiping unit needs to remove oil, one wiping unit continues to wipe the wire core (1), while the other wiping unit cancels the wiping and actively cleans the oil it has absorbed. The second step is to use a fork twister to twist multiple strands of copper-clad aluminum stranded conductor (2) onto the surface of the steel wire core (1) to form the first layer (21) of copper-clad aluminum stranded conductor (2). The third step is to use a fork twister to twist multiple copper-clad aluminum stranded conductors (2) to the outside of the copper-clad aluminum stranded conductors (2) of the first layer (21) to form the copper-clad aluminum stranded conductors (2) of the second layer (22).

6. The process for stranded wire connection of copper-clad aluminum steel rail according to claim 5, characterized in that: The steel wire degreasing and cleaning device in the step includes a cleaning tank (5) and an adjustment component. The inner walls of the cleaning tank (5) are fixedly connected to support platforms (6). Movable seats (7) are slidably arranged on the two support platforms (6). Two wiping units are set on the two movable seats (7). The wiping unit includes two mounting platforms (8) symmetrical with reference to the steel wire core (1). The two mounting platforms (8) are slidably connected to the two movable seats (7). The adjustment component is used to adjust the distance between the two mounting platforms (8) in the same wiping unit. Oil-absorbing felt cloth (9) is clamped on the mounting platform (8). An active squeezing component is set on the mounting platform (8). The active squeezing component is used to actively press the oil-absorbing felt cloth (9) during the process of the adjustment component adjusting the distance between the two mounting platforms (8) in the same wiping unit to accelerate the oil draining.

7. The process for stranded wire connection of copper-clad aluminum steel rail lead wire according to claim 6, characterized in that: The adjustment assembly includes two adjustment slots (61), two clearance slots (71), and a threaded drive assembly. The two adjustment slots (61) are respectively opened on two support platforms (6). The adjustment slots (61) include a first straight slot (611) and two first inclined slots (612). The two clearance slots (71) are respectively opened on two movable seats (7). The two movable seats (7) are respectively slidably connected to the bottom of two mounting platforms (8) in the same wiping unit. An adjustment pin (82) is provided in each of the two first straight slots (611). After passing through the clearance slots (71), the adjustment pin (82) is fixedly connected to the bottom of the mounting platform (8) at the corresponding position. The threaded drive assembly is set on the support platform (6) and is used to drive the movable seat (7) to move on the support platform (6).

8. The process for stranded wire connection of copper-clad aluminum steel rail lead wire according to claim 7, characterized in that: The threaded drive assembly includes a threaded sleeve (10), which is fixedly connected to the bottom of the movable seat (7). A drive screw (11) is threadedly connected to the threaded sleeve (10). Mounting seats (12) are rotatably connected to both ends of the drive screw (11). Mounting seats (12) are fixedly connected to the ends of the support platform (6). A first motor (13) is provided at the ends of both drive screws (11). The first motor (13) is fixedly mounted on the mounting seat (12).

9. The process for stranded wire connection of copper-clad aluminum rail lead wire according to claim 6, characterized in that: The active extrusion assembly includes an embedding groove (81) which is opened on the surface of the mounting platform (8). An oil-absorbing felt (9) is embedded in the embedding groove (81). A top pressure block (14) is slidably arranged in the embedding groove (81). The end face of the top pressure block (14) is in contact with the oil-absorbing felt (9). Two top rods (15) are fixedly connected to the side of the top pressure block (14) away from the oil-absorbing felt (9). The two top rods (15) pass through the mounting platform (8) and extend to the outside of the mounting platform (8). A bracket (16) is fixedly connected to the end of the two top rods (15) away from the mounting platform (8). A ball bearing (17) is movably embedded at the end of the bracket (16). A support spring (18) is sleeved on the surface of each of the two top rods (15). The two ends of the support spring (18) are fixedly connected to the bracket (16) and the mounting platform (8) respectively.

10. The process for stranded wire lead-in wire for copper-clad aluminum steel rails according to claim 9, characterized in that: The mounting platform (8) is provided with a clamping assembly for firmly clamping the oil-absorbing felt cloth (9). The clamping assembly includes a clamping seat (19), a connecting seat (20), and two pairs of support pins (21a). The clamping seat (19) is set in the embedding groove (81). The clamping seat (19) has a receiving groove (191). The clamping seat (19) is sleeved on the surface of the two top rods (15). The clamping seat (19) is sleeved on the surface of the top pressure block (14) through the receiving groove (191). The two pairs of support pins (21a) are respectively fixedly connected to the two ends of the clamping seat (19). The two support pins (21a) are sleeved on the surface of the same pair of support pins (21a). The connecting seat (20) is fixedly connected to the top of the mounting platform (8). A bidirectional screw (201) is rotatably connected to the connecting seat (20). The two ends of the bidirectional screw (201) are respectively threaded to the two support pins (22a).

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