Steel-cored aluminum strand structure and stranding device for producing steel-cored aluminum strand

Abstract

The invention discloses a steel-cored aluminum strand structure and a strand device for producing a steel-cored aluminum strand, and relates to the technical field of steel-cored aluminum strands. The steel-cored aluminum stranded wire structure comprises a steel-cored stranded wire layer, an inner aluminum stranded wire layer and an outer aluminum stranded wire layer which are sequentially arranged from inside to outside, the steel core stranded wire layer is formed by stranding a plurality of steel wires, and the stranding angles of different layers of steel wires from inside to outside are gradually reduced, so that the extrusion force of the outer-layer steel wires on the inner-layer steel wires is reduced, and plastic deformation is avoided; each of the inner aluminum stranded wire layer and the outer aluminum stranded wire layer is formed by stranding a plurality of aluminum wires, the stranding angles of the aluminum wires of different layers from inside to outside are gradually increased, the deformation capability is retained through low tension of the inner layer, the looseness is prevented through moderate tensioning, and a large-angle deformation space is reserved to absorb the thermal expansion difference between the steel core and the aluminum layers; the aluminum wire twisting angle of the outer aluminum stranded wire layer is larger than that of the inner aluminum stranded wire layer, and rainwater permeation is blocked by increasing the surface compactness.

Description

Technical Field

[0001] This invention relates to the field of steel-cored aluminum stranded wire technology, specifically to a steel-cored aluminum stranded wire structure and a stranding device for producing steel-cored aluminum stranded wire. Background Technology

[0002] Steel-cored aluminum stranded wire is a composite wire consisting of a high-strength steel core and an outer layer of multiple strands of aluminum wire. This structure is primarily used in high-voltage transmission lines and urban power grids, effectively resisting wind loads and its own weight. The production of steel-cored aluminum stranded wire requires specialized stranding equipment to ensure a precise and uniform stranding ratio between the steel core and the aluminum wire, thereby guaranteeing the mechanical and electrical properties of the wire.

[0003] However, the existing steel-cored aluminum stranded wire structure and the stranding equipment used to produce steel-cored aluminum stranded wire still have the following problems: 1. Existing steel-cored aluminum stranded wire structures mostly adopt a uniform stranding angle design. However, in actual use, the aluminum stranded wire layers tend to apply excessive radial pressure to the steel core layer during stranding, leading to stress concentration and subsequent plastic deformation. At the same time, the lack of a reasonable angle transition between layers results in increased friction on the wire contact surface, accelerating wear and weakening the anti-loosening ability and interlayer bonding strength. In addition, traditional structures often adopt a uniform direction or a stranding method with one positive and one negative direction for the inner and outer layers in the stranding direction design. The former is prone to causing a large relative sliding tendency between the steel core layer and the adjacent aluminum layer, affecting mechanical coordination. Although the latter can improve the slippage problem between wire layers, it will lead to increased frictional resistance between wire layers and uneven distribution of stranding tension, further affecting tensile strength and wind vibration resistance.

[0004] 2. Existing wires typically lack targeted pre-deformation treatment before entering the stranding area, resulting in insufficient tightness of the various wire layers during stranding. This affects the synchronous forming accuracy between the steel core layer and the aluminum stranded wire layer, easily leading to interlayer misalignment and structural looseness. At the same time, current solidification treatment is mostly concentrated after stranding, lacking a mechanism for dynamic compaction and layer-by-layer solidification of the wire during stranding. This easily leads to uneven stacking, local deformation, and other phenomena, reducing the structural stability and reliability of the wire. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a steel-cored aluminum stranded wire structure and a stranding device for producing steel-cored aluminum stranded wire, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, on the one hand, the present invention provides a steel-cored aluminum stranded wire structure, comprising a steel-cored stranded wire layer, an inner aluminum stranded wire layer, and an outer aluminum stranded wire layer arranged sequentially from the inside out. The steel-cored stranded wire layer is used to provide axial stiffness and bear the main tensile force; the inner aluminum stranded wire layer is used to balance torsional stiffness and radial elasticity and buffer interlayer stress; and the outer aluminum stranded wire layer is used to enhance surface density and resist external impact. The steel-cored stranded wire layer is composed of multiple stranded steel wires, and the stranding angle of the steel wires in different layers decreases from the inside out. To reduce the compressive force of the outer steel wire on the inner steel wire and avoid plastic deformation; both the inner and outer aluminum stranded layers are composed of multiple aluminum wires twisted together, and the twisting angle of the aluminum wires in different layers increases from the inside to the outside. The inner layer retains deformation capacity through low tension, is moderately tensioned to prevent loosening, and reserves space for large-angle deformation to absorb the thermal expansion difference between the steel core and the aluminum layer; the twisting angle of the aluminum wires in the outer aluminum stranded layer is greater than that in the inner aluminum stranded layer, which increases the surface density to block rainwater penetration.

[0007] Furthermore, the stranding angles of the steel wires in the steel core stranded layer are 17° and 15° from the inside out, the stranding angles of the aluminum wires in the inner aluminum stranded layer are 24°, 26° and 28° from the inside out, and the stranding angle of the aluminum wires in the outer aluminum stranded layer is 30°. The stranding angles of each layer change continuously in sequence to adapt to the overall mechanical properties of the wire.

[0008] Furthermore, the steel core stranded layer and the inner aluminum stranded layer are stranded in the same direction to reduce the relative slippage between the steel core layer and the adjacent aluminum layer, thereby improving the overall tensile strength and wind vibration resistance of the wire. The outer aluminum stranded layer and the inner aluminum stranded layer are stranded in opposite directions. By reverse stranding, the effective surface area of ​​the aluminum layer is increased, corona loss is reduced, and eddy current concentration is suppressed.

[0009] On the other hand, the present invention also provides a stranding device for producing steel-cored aluminum stranded wire, applicable to the above-mentioned steel-cored aluminum stranded wire structure, comprising: a stranding disc, the stranding disc having a stepped structure, a rotating ring rotatably sleeved on its outer side, the stranding disc and the rotating ring rotating synchronously but in opposite directions, each stepped surface of the stranding disc having evenly distributed circumferentially distributed through holes for threading wires in the steel-cored stranded layer and the inner aluminum stranded layer, the rotating ring having through holes adapted to the wires of the outer aluminum stranded layer; and a pre-deformation assembly, the pre-deformation assembly being disposed on the right side of the stranding disc, and connected to each layer of steel wire and aluminum wire. Correspondingly, for steel wire, the angle between each pre-deformation component and the central axis of the stranding disc gradually decreases from left to right; for aluminum wire, the angle between each pre-deformation component and the central axis of the stranding disc gradually increases from left to right. This is used for pre-deformation of the wire before stranding to better fit the subsequent stranding shape. The forming component is located between adjacent wires and rotates synchronously with the wire during stranding. It is used to rotate and press each layer of wire layer by layer during stranding, with the applied pressing force gradually increasing from the inside to the outside along the stranding layers. Further, the pre-deformation component includes multiple evenly distributed rotating rollers, which are rotatably mounted on the same support frame. The wire passes sequentially through the gaps formed between the rotating rollers. The support frame at different positions is set with different inclination states according to the stranding angle of the wire. Below the rotating rollers are two forming turntables distributed left and right. The forming turntables are petal-shaped and mesh with each other to form a complementary fit when rotating relative to each other. Forming grooves for accommodating the wire are formed on the outer periphery of the forming turntables.

[0010] Furthermore, rotating gears are respectively installed on the rear sides of the two forming turntables on the left and right sides, and the rotating gears on the left and right sides mesh with each other. Pulleys are installed on the rear end of the bottom rotating roller and the rear end of one of the rotating gears, and the pulleys are connected by belt drive.

[0011] Furthermore, the solidification assembly includes a rotating sleeve, which is sleeved on the outside of the corresponding wire and coaxially arranged with the wire. The support frame in the same pre-deformation assembly is fixedly installed on the corresponding rotating sleeve. The rotating sleeve corresponding to the steel core stranded layer and the inner aluminum stranded layer is fixedly connected to the stranding disc through a connecting frame, and the rotating sleeve corresponding to the outer aluminum stranded layer is fixedly connected to the rotating ring through a connecting frame, so that each layer of wire completes pre-deformation and solidification treatment simultaneously during the stranding process.

[0012] Furthermore, the solidification assembly also includes a support sleeve disposed inside the rotating sleeve. A circumferentially evenly distributed pressure block is slidably mounted on the inner side of the support sleeve along its radial direction. A support spring connects the pressure block to the outer wall of the support sleeve. A mating post is provided on the side of the pressure block facing the inner wall of the rotating sleeve. A sliding groove is provided on the inner side of the rotating sleeve to slide in conjunction with the mating post, allowing the pressure block to adaptively slide along the groove during the rotation of the rotating sleeve, thereby applying uniform radial pressure to the stranded wire and achieving dynamic solidification. Evenly distributed balls are rolled on the side of the pressure block near the axis of the support sleeve, and the balls roll in contact with the outer surface of the wire.

[0013] Furthermore, rotating rollers are rotatably provided on both the left and right sides of the through hole, and limiting rollers are provided on the outer side of the rotating rollers. The limiting rollers are rotatably installed between two arc-shaped blocks via a rotating shaft. The arc-shaped blocks slide in cooperation with the arc-shaped grooves opened on the arc-shaped plate. The arc-shaped plate is fixedly connected to the corresponding twisting disc and rotating ring. A connecting spring is connected between the arc-shaped blocks and the groove wall of the arc-shaped groove.

[0014] Furthermore, a pay-off reel is fixedly connected to the left side of the winding reel. An outer ring fixedly connected to the rotating ring is fitted on the outside of the pay-off reel. The pay-off reel and the outer ring are coaxially and rotatably mounted on the same fixed platform. An outer toothed ring is fixedly fitted on the outside of the pay-off reel, and an inner toothed ring is fixedly fitted on the inside of the outer ring. A transmission gear meshes between the inner toothed ring and the outer toothed ring. The transmission gear is rotatably mounted on the fixed platform. A drive motor is mounted on the fixed platform, and its output shaft is fixedly connected to the center of the pay-off reel.

[0015] The present invention has the following beneficial effects: (1) The steel-core aluminum stranded wire structure, through the steel core stranded wire layer, inner aluminum stranded wire layer and outer aluminum stranded wire layer arranged sequentially from the inside to the outside, realizes functional layering and structural optimization, effectively improving the overall performance of the wire. The steel core stranded wire layer adopts a stranding angle that decreases from the inside to the outside, reducing the radial pressure of the outer steel wire on the inner layer, avoiding stress concentration leading to plastic deformation, and improving the stability and long-term reliability of the steel core structure. The inner aluminum stranded wire layer adopts a stranding angle that increases from the inside to the outside, keeping the inner aluminum wire in a low tension state, preventing loosening, and absorbing the thermal stress between the steel and aluminum layers by reserving deformation space, reducing interlayer wear. The outer aluminum stranded wire layer adopts a larger stranding angle, enhancing the density of the outer layer, effectively improving the ability to resist wind and rain erosion, wear resistance and resistance to external impact, while blocking rainwater penetration and extending the service life of the wire.

[0016] (2) In this steel-core aluminum stranded wire structure, the steel core stranded wire layer and the inner aluminum stranded wire layer are stranded in the same direction, which helps to reduce the relative slip between the two, improve the overall mechanical coordination of the wire, and enhance the tensile strength and wind vibration resistance. The outer aluminum stranded wire layer and the inner aluminum stranded wire layer are stranded in opposite directions. By reverse stranding, the effective surface area of ​​the outer layer of aluminum wire is increased, which helps to reduce corona loss, suppress eddy current concentration, improve the electromagnetic performance of the wire, and enhance its operational stability in high-voltage power transmission environment.

[0017] (3) The stranding device for producing steel-cored aluminum stranded wire, by setting up pre-deformation components corresponding to each layer of wire, is used to perform pre-deformation treatment on the different layers of wire before the wire enters the stranding area, so as to realize the directional bending and angle pre-adjustment of the wire, so that the wire completes the initial angle adaptation and shape adjustment before entering the stranding process, thereby better conforming to the subsequent stranding shape, improving the stranding density and structural consistency, and avoiding loose stranding or interlayer misalignment caused by angle deviation. In addition, the pre-deformation components also have the function of guiding and supporting the wire, which can effectively prevent the wire from shifting or shaking during the transportation process, ensuring that it maintains a stable posture when entering the stranding area, further improving the continuity of the stranding process and the quality stability of the finished wire.

[0018] (4) The stranding device for producing steel-cored aluminum stranded wire has a certain elastic expansion space during the pre-deformation process. That is, the deformed wire is not in a taut state. It can gradually move into the rotating sleeve in the shaped state. One end of the wire is held by two forming turntables, and the other end is pressed by a pressure block, so that the section is kept in the bent state after being shaped and enters the rotating sleeve for winding, thereby improving the continuity of the stranding process and the quality stability of the finished wire.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the steel-cored aluminum stranded wire structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the stranding device for producing steel-cored aluminum stranded wire according to the present invention. Figure 3 This is a schematic diagram of the internal gear ring, transmission gear, and external gear ring in this invention; Figure 4 This is a partial cross-sectional view of the pay-off reel and outer ring in this invention; Figure 5 This is a schematic diagram of the left-side structure of the winch disc and rotating ring in this invention; Figure 6 This is a schematic diagram of the structure of the winch and support ring in this invention; Figure 7 This is a partial structural diagram of the winch disc and rotating roller in this invention; Figure 8 for Figure 7 Enlarged view of region A in the middle; Figure 9 This is a schematic diagram of the pre-deformation component and the solidification component in this invention; Figure 10 This is a schematic diagram of the rotating gear, pulley, and belt in this invention; Figure 11 This is a partial cross-sectional view of the solidification component in this invention; Figure 12 This is a partial cross-sectional view of the rotating sleeve in this invention; Figure 13 This is a cross-sectional planar structural diagram of the rotating sleeve in this invention; Figure 14 This is a cross-sectional planar structural diagram of the rotating sleeve, supporting sleeve, and slider in this invention.

[0021] In the diagram, 1. Steel core stranded wire layer; 2. Inner aluminum stranded wire layer; 3. Outer aluminum stranded wire layer; 4. Winding device; 5. Stranding disc; 51. Through hole; 511. Rotating roller; 512. Limiting roller; 513. Arc-shaped block; 514. Arc-shaped plate; 515. Arc-shaped groove; 516. Connecting spring; 52. Rotating ring; 53. Pre-deformation assembly; 531. Rotating roller; 532. Support frame; 533. Forming turntable; 534. Rotating gear; 535. 536. Pulley; 54. Belt; 55. Fixed assembly; 56. Rotating sleeve; 57. Connecting frame; 58. Support ring; 59. Support sleeve; 50. Pressure block; 50. Support spring; 51. Mating column; 52. Slide groove; 53. Ball bearing; 6. Pay-off reel; 63. Outer ring; 64. Connecting shaft; 65. External gear ring; 66. Internal gear ring; 67. Transmission gear; 68. Drive motor; 7. Fixed platform. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] The following is based on Figures 1-14 This invention describes a steel-cored aluminum stranded wire structure and a stranding device for producing steel-cored aluminum stranded wire.

[0025] On the one hand, the present invention provides a steel-cored aluminum stranded wire structure.

[0026] like Figure 1 As shown, the steel-cored aluminum stranded wire structure includes a steel-cored stranded wire layer 1, an inner aluminum stranded wire layer 2, and an outer aluminum stranded wire layer 3 arranged sequentially from the inside to the outside. The three layers work together to bear the main tensile force, buffer stress, and resist the influence of the external environment, respectively.

[0027] Among them, the steel core stranded layer 1 is composed of multiple steel wires twisted together. As the main load-bearing body of the entire wire, it mainly bears the axial tensile force and provides high tensile strength and axial stiffness. At the same time, the steel core stranded layer 1 adopts a multi-layer structure design, with the twisting angles from the inside to the outside being 17° and 15° respectively, showing a gradually decreasing trend. By gradually reducing the twisting angle layer by layer, the radial pressure of the outer steel wires on the inner steel wires during the twisting process becomes more uniform, avoiding plastic deformation of the inner steel wires due to local stress concentration, thereby improving the stability and long-term reliability of the steel core structure.

[0028] The inner aluminum stranded layer 2 is located outside the steel core stranded layer 1 and is composed of multiple aluminum wires twisted together. It plays a crucial role in the wire structure, acting as a bridge between the upper and lower layers. The inner aluminum stranded layer 2 not only provides some electrical conductivity but also balances the torsional stiffness and radial elasticity of the wire through its stranded structure, thus buffering the stress between the steel core and the outer aluminum layer. The stranding angle of this layer increases from the inside to the outside, with 24°, 26°, and 28°. This gradual increase in angle keeps the inner aluminum wires at a low tension, preserving a certain degree of deformation capacity and preventing loosening due to excessive tension during manufacturing or use. Meanwhile, the outer aluminum wires use a larger stranding angle, leaving sufficient deformation space to absorb the thermal stress generated by the difference in thermal expansion coefficients between the steel core stranded layer 1 and the inner aluminum stranded layer 2, reducing wear between the wires and thus improving the structural stability of the wire under different temperature environments.

[0029] The outer aluminum stranded wire layer 3 is located on the outermost side and is also composed of multiple aluminum wires twisted together. Its main function is to enhance the density of the wire surface, improve the wire's resistance to wind and rain erosion and surface wear resistance. The twisting angle of the aluminum wires in this layer is 30°, which is greater than the twisting angle of each layer of the inner aluminum stranded wire layer 2. This further enhances the density of the outer structure, effectively blocks rainwater penetration, prevents the internal structure from being damp and corroded, extends the service life of the wire, and also improves the wire surface's resistance to external mechanical impact.

[0030] In addition, the steel core stranded wire layer 1 and the inner aluminum stranded wire layer 2 are stranded in the same direction, which helps to reduce the relative slippage between them, improve the overall mechanical coordination of the wire, and enhance the tensile strength and wind vibration resistance. The outer aluminum stranded wire layer 3 is stranded in the opposite direction to the inner aluminum stranded wire layer 2. By reverse stranding, the effective surface area of ​​the outer layer of aluminum wire is increased, which helps to reduce corona loss, suppress eddy current concentration, improve the electromagnetic performance of the wire, and enhance its operational stability in high-voltage transmission environments.

[0031] On the other hand, the present invention also provides a stranding device for producing steel-cored aluminum stranded wire, suitable for steel-cored aluminum stranded wire structures, combined with Figures 2-8 It includes a stranding disc 5, which has a stepped structure with multiple stepped surfaces arranged sequentially from left to right. Each stepped surface of the stranding disc 5 is provided with through holes 51 evenly distributed in the circumferential direction to adapt to the stranding path of multi-layer wires. It is used to guide the wires of the steel core stranded layer 1 and the inner aluminum stranded layer 2 through, ensuring that the wires are neatly arranged and the stranding angle is accurate during the stranding process, and avoiding the loose structure or uneven stranding caused by wire deviation.

[0032] Furthermore, a rotating ring 52 is rotatably sleeved on the outer side of the stranding disc 5. The rotating ring 52 rotates synchronously with the stranding disc 5, but in the opposite direction, thereby realizing the reverse stranding of different layers of wire. The rotating ring 52 is provided with a through hole 51 that is compatible with the outer aluminum stranded layer 3 wire, which is used to guide the layer of wire to complete the stranding in the reverse rotation state. Through the synchronous reverse rotation of the stranding disc 5 and the rotating ring 52, the steel core stranded layer 1 and the inner aluminum stranded layer 2 are stranded in the same direction, while the outer aluminum stranded layer 3 is stranded in the opposite direction, thereby effectively balancing the overall torque of the wire body, reducing the residual stress generated during the stranding process, and improving the stability and stranding density of the wire body structure.

[0033] like Figure 5 and Figure 8As shown, to avoid frictional damage to the wire due to direct contact with the through hole 51 during the threading process, rotating rollers 511 are rotatably installed on both the left and right sides of the through hole 51. The rotating rollers 511 are fixedly connected to the corresponding stranding disc 5 or rotating ring 52 through the mounting bracket. When the wire passes through the through hole 51, it can form rolling contact with the rotating rollers 511. The rotating rollers 511 can not only effectively support the wire, but also play a guiding role during the conveying process, reducing frictional resistance and avoiding scratches on the surface of the wire. At the same time, a limiting roller 512 for limiting and straightening the wire is further provided on the outside of the rotating rollers 511. The wire is threaded between the limiting roller 512 and the rotating roller 511. The limiting roller 512 can apply a moderate pressing force to the wire to prevent it from shifting or bending before stranding.

[0034] The limiting roller 512 is rotatably mounted between two arc-shaped blocks 513 via a rotating shaft. The arc-shaped blocks 513 are slidably fitted into the arc-shaped grooves 515 opened on the arc-shaped plate 514. The arc-shaped plate 514 is fixedly connected to the corresponding twisting disc 5 or rotating ring 52. The arc-shaped blocks 513 can slide along the arc-shaped path in the arc-shaped grooves 515, thereby driving the limiting roller 512 to move towards the rotating roller 511. A connecting spring 516 is provided between the arc-shaped blocks 513 and the groove wall of the arc-shaped grooves 515. The elastic force of the connecting spring 516 keeps the limiting roller 512 always in contact with the outside of the rotating roller 511, so that the limiting roller 512 can adaptively adjust according to the running state of the wire. It is especially suitable for situations where the wire shakes slightly during the conveying process, thereby realizing dynamic limiting and stable conveying of the wire.

[0035] like Figure 2 As shown, a pay-off reel 6 is fixedly connected to the left side of the stranding reel 5. The pay-off reel 6 is used to carry and release the steel wire and aluminum wire used for stranding. Multiple pay-off drums are evenly distributed around the circumference of the pay-off reel 6. Each pay-off drum is rotatably mounted on the pay-off reel 6 and is used to store different types and specifications of wires respectively, ensuring that the wires maintain a good release state during the conveying process. At the same time, the pay-off reel 6 and the stranding reel 5 rotate synchronously to ensure that the angle of the wires is consistent during the conveying and stranding process, and to avoid wire deviation or uneven tension due to asynchronous rotation. An outer ring 61 is sleeved on the outside of the pay-off reel 6. The outer ring 61 is also equipped with pay-off drums evenly distributed around the circumference. The outer ring 61 is fixedly connected to the rotating ring 52 and is used to drive the reverse stranding of the outer aluminum layer wires to realize the synchronous reverse stranding of multi-layer wires.

[0036] It should be noted that a tensioning device is provided between the pay-off reel 6 and the stranding reel 5. This tensioning device is a wire tension adjustment structure in the prior art, used to apply stable tension to the wire during the wire conveying process to prevent the wire from becoming loose or overstretched during stranding, thereby ensuring the compactness and consistency of the stranded structure. A conveying roller group is also provided to stably transmit the wire, ensuring that the wire enters the stranding area at a constant speed, avoiding the impact of unstable wire operation on the stranding quality. The tensioning device and the conveying roller group work together to maintain the smooth operation of the wire throughout the stranding process. The specific structure of the tensioning device and the conveying roller group is not shown in the figure.

[0037] like Figures 2-4 As shown, to achieve synchronous counter-rotation between the stranding disc 5 and the rotating ring 52, the pay-off disc 6 and the outer ring 61 are coaxially mounted on the same fixed platform 7. The pay-off disc 6 and the outer ring 61 are respectively fixedly connected to the corresponding stranding disc 5 and rotating ring 52 via connecting shafts 611, so that the rotational motion of the pay-off disc 6 can be synchronously transmitted to the stranding disc 5, and the rotational motion of the outer ring 61 can be synchronously transmitted to the rotating ring 52. An external toothed ring 612 is fixedly fitted on the outer side of the pay-off disc 6, and an internal toothed ring 613 is fixedly fitted on the inner side of the outer ring 61. A transmission gear 614 meshes between the internal toothed ring 613 and the external toothed ring 612. The transmission gear 614 is rotatably mounted on the fixed platform 7. The winding disc 5 and the rotating ring 52 are used to achieve synchronous and opposite rotation. The winding disc 5 is stably rotatably connected above the fixed platform 7. The fixed platform 7 is equipped with a drive motor 615, whose output shaft is fixedly connected to the center of the pay-off disc 6. During operation, the drive motor 615 drives the pay-off disc 6 to rotate. The pay-off disc 6 drives the transmission gear 614 to rotate through the outer gear ring 612. The transmission gear 614 then drives the outer ring 61 to rotate in the opposite direction through meshing with the inner gear ring 613. Thus, under the linkage action of the connecting shaft 611, the winding disc 5 and the rotating ring 52 achieve synchronous and opposite rotational motion, and the winding disc 5 is stably rotatably connected above the fixed platform 7.

[0038] like Figure 9 As shown, a pre-deformation component 53 is also provided on the right side of the stranding disc 5. This pre-deformation component 53 is set before the wire enters the stranding area and is used to perform angle adaptation pre-deformation treatment on the wire before stranding, so that it fits the subsequent stranding shape better, thereby improving the stranding density and structural consistency. At the same time, the pre-deformation component 53 also plays a guiding and supporting role for the wire, ensuring that the wire maintains a stable posture when entering the stranding area. The pre-deformation component 53 corresponds one-to-one with each layer of steel wire and aluminum wire, and performs directional pre-deformation for wires of different layers. Among them, for steel wires, the angle between each pre-deformation component 53 set from left to right and the central axis of the stranding disc 5 ( Figure 9 The obtuse angles (in the image) gradually decrease; while for aluminum wire, the angles between each pre-deformation component 53 and the central axis from left to right (in the image) gradually decrease. Figure 9 The obtuse angles in the stranding gradually increase to match the changes in stranding angles required by each layer of wire during the stranding process.

[0039] like Figure 7 , Figure 9 and Figure 10 As shown, specifically, each pre-deformation component 53 includes multiple rotating rollers 531 evenly distributed along the circumference. The rotating rollers 531 are rotatably mounted on the same support frame 532 via a rotating shaft. The wire passes through the gap formed between each rotating roller 531 in sequence. The support frame 532 at different positions is set to different tilt states according to the twisting angle of the corresponding wire, thereby achieving tensioning and guiding of the wire.

[0040] Furthermore, two forming discs 533 are arranged on the left and right sides below the rotating roller 531. The forming discs 533 are petal-shaped (with regular protrusions and concave structures on the outer contour). When they rotate relative to each other, they mesh and form a complementary fit. The outer periphery of the forming discs 533 is provided with forming grooves for accommodating the wire. The two forming discs 533 rotate synchronously towards each other during operation. Their rotation directions are opposite, but their linear speed is consistent with the wire's travel speed, ensuring that the wire passes smoothly without being pulled or piled up. When the wire passes through the rotating rollers 531 and descends to the area of ​​the forming discs 533, it enters the gap between the two forming discs 533 and is embedded in the corresponding forming groove. As the forming discs 533 continue to rotate, the wire is periodically bent under the guidance of the forming groove, forming a regular wave or bent pre-deformation structure, achieving initial shaping that is beneficial to subsequent stranding.

[0041] To achieve the aforementioned synchronous movement, rotating gears 534 are respectively installed on the rear side of the left and right forming turntables 533. The rotating gears 534 on the left and right sides mesh with each other to ensure that the forming turntables 533 on both sides can rotate precisely at the same speed but in opposite directions. The rear end of the bottom rotating roller 531 and the right side ( Figure 10 From the perspective of rotation, each of the rotating gears 534 has a pulley 535 installed at its rear end. The pulleys 535 are connected to each other by a belt 536. The corresponding rotating gears 534 and pulleys 535 are rotatably mounted on the same support frame 532. The power is provided by the rotating roller 531 located at the bottom. This rotating roller 531 is a power conveying roller with a built-in motor, which can actively rotate and drive the wire forward.

[0042] During operation, the rotating roller 531 rotates actively and drives the wire forward. The pulley 535 installed at the rear end of the rotating roller 531 rotates accordingly and transmits power to the pulley 535 at the other end through the belt 536. The latter is coaxially connected to the left rotating gear 534, thereby driving it to rotate synchronously. Since the rotating gears 534 on the left and right sides mesh with each other, the right rotating gear 534 and the corresponding forming turntable 533 rotate synchronously in the opposite direction with the left forming turntable 533 under the transmission action.

[0043] like Figure 6 , Figure 9 and Figure 11 As shown, a shaping component 54 is also provided between adjacent wires. The shaping component 54 can rotate synchronously with the wires during the stranding process. It is used to rotate and press each layer of wires layer by layer during the stranding process. The applied pressing force gradually increases from the inside to the outside along the number of stranded layers to improve the density and geometric consistency of the stranded structure. It includes a rotating sleeve 541, which is sleeved on the outside of the corresponding wire and is coaxial with the wire to ensure that uniform radial pressure is applied to the wire during rotation. The support frame 532 in the same pre-deformation component 53 is fixedly installed on the corresponding rotating sleeve 541, so that the pre-deformation and shaping processes are completed in the same rotating unit.

[0044] Among them, the rotating sleeve 541 corresponding to the steel core stranded layer 1 and the inner aluminum stranded layer 2 is fixedly connected to the stranding disc 5 through the connecting frame 542 and rotates synchronously with the stranding disc 5. The rotating sleeve 541 corresponding to the outer aluminum stranded layer 3 is fixedly connected to the rotating ring 52 through the connecting frame 542 and rotates in the opposite direction with the rotating ring 52. The connecting frame 542 is provided with a clearance through groove for avoiding the corresponding wire. In order to ensure the operational stability of the rightmost rotating sleeve 541 and the pre-deformation component 53 connected to it during the working process, a support ring 543 fixedly connected to the rotating ring 52 is fixedly fitted on the outside of the rotating sleeve 541. The support ring 543 is rotatably set above the fixed platform 7.

[0045] like Figure 9 and Figures 11-14As shown, the forming assembly 54 also includes a support sleeve 544 disposed inside the rotating sleeve 541, through which the stranded wire can pass. A circumferentially evenly distributed pressure block 545 is slidably mounted on the side wall of the support sleeve 544 along its radial direction. A support spring 546 connects the pressure block 545 to the outer wall of the support sleeve 544. The pressure block 545 can move radially along the support sleeve 544 under the action of the support spring 546, applying a moderate radial preload to the stranded wire during the stranding process. A mating post 547 is provided on the side of the pressure block 545 facing the inner wall of the rotating sleeve 541. A sliding groove 548 is opened on the inner side of the rotating sleeve 541 to slide and engage with the mating post 547. Under the action of the support spring 546, the pressure block 545 pre-contacts the stranded wire, thereby forming the wire. A certain amount of friction exists between the pressure block 545 and the stranded wire. When the rotating sleeve 541 rotates, the inner wall of the rectangular groove 548 gradually squeezes the mating column 547, and drives the pressure block 545 and the support sleeve 544 to rotate synchronously, so that the solidification process and the twisting action remain dynamically consistent.

[0046] It should be noted that the wire has a certain elastic expansion space during the process of passing through the pre-deformation component 53. That is, the wire is not taut at this point. It can gradually move into the rotating sleeve 541 in a shaped state. One end of the wire is held by two forming turntables 533, and the other end is pressed by the pressure block 545. This allows the section to enter the rotating sleeve 541 in a shaped bent state for winding. This structure realizes dynamic solidification of the stranded wire. It can timely and stably spin and wrap the wire after it has been bent by the pre-deformation component 53 to the outer layer of the stranded core. This ensures that the deformed wire is accurately guided and tightly adhered when it enters the stranding point, effectively improving the winding density and geometric consistency.

[0047] It should be noted that the length of the chute 548 is set reasonably, which can ensure that the pressure block 545 can be adaptively adjusted during rotation, avoid damage to the wire surface due to excessive pressure, and ensure that the solidification effect is not affected.

[0048] To accommodate the diameter differences of different stranded wires and their deformation control requirements, the diameter and length of the rotating sleeve 541 and the support sleeve 544, arranged from left to right, increase layer by layer. As the number of stranded layers increases, the size of the rotating sleeve 541 and the support sleeve 544 increases accordingly to match the stranding trajectory and spatial layout of each layer of wire, ensuring that the forming component 54 can effectively apply a pressing effect to each layer of wire.

[0049] To further reduce the frictional resistance between the pressure block 545 and the wire and improve the smoothness of the wire conveying during the solidification process, rolling balls 549 evenly distributed in the circumferential direction are also rolled on the side of the pressure block 545 near the axis of the support sleeve 544. The rolling balls 549 roll in contact with the outer surface of the wire, effectively reducing the sliding friction between the two while the pressure block 545 applies radial pressure to the wire, thus avoiding damage to the wire surface or unstable operation due to excessive friction.

[0050] like Figure 2 As shown, the steel-cored aluminum stranded wire, after being pressed and dynamically shaped layer by layer by the solidification component 54, is finally transported to the winding device 4 for centralized winding. The winding device 4 can achieve stable traction and neat winding of the formed wire. Only a part of the structure of the winding device 4 is shown schematically in the figure.

Claims

1. A steel-cored aluminum stranded wire structure, characterized in that, It includes a steel core stranded wire layer (1), an inner aluminum stranded wire layer (2), and an outer aluminum stranded wire layer (3) arranged sequentially from the inside to the outside. The steel core stranded layer (1) is made of multiple steel wires twisted together, and the twisting angle of the steel wires in different layers from the inside to the outside shows a decreasing trend. Both the inner aluminum stranded layer (2) and the outer aluminum stranded layer (3) are made of multiple aluminum wires twisted together, and the twisting angle of the aluminum wires in different layers from the inside to the outside shows an increasing trend. The twisting angle of the aluminum wires in the outer aluminum stranded layer (3) is greater than that in the inner aluminum stranded layer (2).

2. The steel-cored aluminum stranded wire structure according to claim 1, characterized in that: The twisting angles of the steel wires in the steel core stranded layer (1) are 17° and 15° from the inside to the outside, the twisting angles of the aluminum wires in the inner aluminum stranded layer (2) are 24°, 26° and 28° from the inside to the outside, and the twisting angle of the aluminum wires in the outer aluminum stranded layer (3) is 30°.

3. The steel-cored aluminum stranded wire structure according to claim 2, characterized in that: The steel core stranded layer (1) and the inner aluminum stranded layer (2) are stranded in the same direction, while the outer aluminum stranded layer (3) and the inner aluminum stranded layer (2) are stranded in opposite directions.

4. A stranding device for producing steel-cored aluminum stranded wire, applicable to the steel-cored aluminum stranded wire structure described in any one of claims 1 to 3, characterized in that: include: The stranding disc (5) has a stepped structure, and a rotating ring (52) is rotatably sleeved on its outer side. The stranding disc (5) and the rotating ring (52) rotate synchronously and in opposite directions. Each step surface of the stranding disc (5) is provided with through holes (51) evenly distributed in the circumferential direction for threading the wires in the steel core stranded layer (1) and the inner aluminum stranded layer (2). The rotating ring (52) is provided with through holes (51) that are compatible with the wires in the outer aluminum stranded layer (3). Pre-deformation component (53) is disposed on the right side of the stranding disc (5) and corresponds to each layer of steel wire and aluminum wire. For steel wire, the angle between each pre-deformation component (53) and the central axis of the stranding disc (5) gradually decreases from left to right. For aluminum wire, the angle between each pre-deformation component (53) and the central axis of the stranding disc (5) gradually increases from left to right. It is used to pre-deform the wire to adapt the angle before stranding so that it fits the subsequent stranding shape better. A shaping component (54) is disposed between adjacent wires and can rotate synchronously with the wires during the twisting process.

5. The stranding device for producing steel-cored aluminum stranded wire according to claim 4, characterized in that: The pre-deformation component (53) includes multiple evenly distributed rotating rollers (531), which are rotatably mounted on the same support frame (532). The wire passes through the gap formed between each rotating roller (531) in sequence. The support frame (532) at different positions is set to different tilt states according to the twisting angle of the wire. Below the rotating roller (531) are two forming turntables (533) distributed on the left and right. The forming turntables (533) are petal-shaped and they mesh with each other to form a complementary cooperation when they rotate relative to each other. The outer periphery of the forming turntables (533) is provided with forming grooves for accommodating wires.

6. The stranding device for producing steel-cored aluminum stranded wire according to claim 5, characterized in that: Rotary gears (534) are respectively installed on the rear side of the two forming turntables (533) on the left and right sides. The rotating gears (534) on the left and right sides mesh with each other. The rear end of the rotating roller (531) at the bottom and the rear end of one of the rotating gears (534) are both equipped with pulleys (535). The pulleys (535) are connected by a belt (536).

7. The stranding device for producing steel-cored aluminum stranded wire according to claim 5, characterized in that: The solidification component (54) includes a rotating sleeve (541), which is sleeved on the outside of the corresponding wire and is coaxial with the wire. The support frame (532) in the same pre-deformation component (53) is fixedly installed on the corresponding rotating sleeve (541). The rotating sleeve (541) corresponding to the steel core stranded layer (1) and the inner aluminum stranded layer (2) is fixedly connected to the stranding disc (5) through the connecting frame (542). The rotating sleeve (541) corresponding to the outer aluminum stranded layer (3) is fixedly connected to the rotating ring (52) through the connecting frame (542).

8. The stranding device for producing steel-cored aluminum stranded wire according to claim 7, characterized in that: The solidification assembly (54) further includes a support sleeve (544) disposed inside the rotating sleeve (541). The inner side of the support sleeve (544) is slidably mounted with circumferentially evenly distributed pressure blocks (545). A support spring (546) is connected between the pressure blocks (545) and the outer wall of the support sleeve (544). A mating post (547) is provided on the side of the pressure block (545) facing the inner wall of the rotating sleeve (541). A sliding groove (548) is opened on the inner side of the rotating sleeve (541) to slide in cooperation with the mating post (547), so that the pressure block (545) can slide adaptively along the sliding groove (548) during the rotation of the rotating sleeve (541), thereby applying uniform radial pressure to the stranded wire and realizing dynamic solidification. The pressure block (545) has evenly distributed balls (549) rolled on one side near the axis of the support sleeve (544), and the balls (549) roll in contact with the outer surface of the wire.

9. The stranding device for producing steel-cored aluminum stranded wire according to claim 4, characterized in that: Rotating rollers (511) are rotatably provided on both the left and right sides of the through hole (51). A limiting roller (512) is provided on the outside of the rotating roller (511). The limiting roller (512) is rotatably installed between two arc blocks (513) via a rotating shaft. The arc blocks (513) slide with the arc groove (515) opened on the arc plate (514). The arc plate (514) is fixedly connected to the corresponding twisting disc (5) and rotating ring (52). A connecting spring (516) is connected between the arc block (513) and the groove wall of the arc groove (515).

10. A stranding device for producing steel-cored aluminum stranded wire according to claim 9, characterized in that: The left side of the winding disc (5) is provided with a pay-off disc (6) fixedly connected to it. The pay-off disc (6) is fitted with an outer ring (61) fixedly connected to the rotating ring (52). The pay-off disc (6) and the outer ring (61) are coaxially mounted on the same fixed platform (7). An outer toothed ring (612) is fixedly fitted on the outer side of the pay-off disc (6). An inner toothed ring (613) is fixedly fitted on the inner side of the outer ring (61). A transmission gear (614) meshes between the inner toothed ring (613) and the outer toothed ring (612). The transmission gear (614) is rotatably mounted on the fixed platform (7). A drive motor (615) is mounted on the fixed platform (7), and its output shaft is fixedly connected to the center of the pay-off disc (6).

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