A spacing positioning device for sparsely wound and expanded diameter steel core aluminum stranded wire

Abstract

The present application relates to the field of manufacturing sparsely wound expanded diameter conductors, and specifically discloses a spacing positioning device for sparsely wound expanded diameter steel core aluminum stranded wire, wherein the mold is configured as an expanded diameter trumpet shape; a plurality of wire-passing holes are provided on the mold and are evenly and equidistantly distributed on the circumference, and the paths of the wire-passing holes are the same as the mold outline; a wire-tightening mechanism is provided inside the wire-passing hole, and the monofilament is in sliding contact with the wire-tightening mechanism; the wire-passing hole is located at one end of the expanded diameter trumpet shape and an inner-drawn aluminum wire reel is provided. The fixed-distance mold is configured as a trumpet shape, and a wire-passing hole is provided on the mold, and the paths of the wire-passing hole are consistent with the outline of the trumpet shape. After the monofilament passes through the wire-passing hole, the diameter is expanded, and the monofilament is tightened and straightened under the action of the wire-tightening mechanism provided in the wire-passing hole. The wire-passing holes are evenly and equidistantly distributed on the circumference of the mold, achieving the effect of controlling the spacing and avoiding the accumulation of the monofilament after being wound around the steel core; arranging the aluminum wire reel on the fixed-distance mold can avoid the problem of reverse rotation of the aluminum wire, and no additional device is required for back-twisting.

Description

Technical Field

[0001] The invention relates to the field of manufacturing sparsely wound and expanded diameter conductors, and in particular to an interval positioning device for sparsely wound and expanded diameter steel core aluminum stranded conductors. Background Art

[0002] As my country vigorously promotes "west-to-east power transmission, north-south power supply, and nationwide interconnection" and actively develops ultra-high voltage (UHV) power grids, the uneven distribution of power resources, increased power transmission capacity, and longer transmission lines pose challenges to the safety and stability of the power system. High-voltage transmission lines are prone to corona, which not only consumes significant amounts of electricity but also seriously impacts the ecological environment through radio interference and noise.

[0003] Using sparsely wound, expanded-diameter aluminum stranded wire instead of single-core wire can reduce the impact of corona. The increase in the number of outer aluminum wires increases the surface roughness coefficient of the stranded wire, and the surface of the stranded wire gradually approaches that of a smooth wire. The corona initiation electric field of the line continues to decrease and approaches the corona initiation electric field corresponding to a smooth wire, while the corona initiation voltage continues to increase and approaches the corona initiation voltage corresponding to a smooth wire.

[0004] For the production of expanded diameter conductors, a stranding machine is disclosed in the prior art, with the publication number CN209183331U. Its main structure is a conductor calibration mechanism, and the conductor stranding mechanism includes a main shaft, a multi-stage backtwist gear set, a large turntable, a pay-off disk, a pay-off disk seat and a die seat. The main shaft is connected to the power transmission mechanism, and the large turntable is installed at the front end of the main shaft, and is used to rotate with the main shaft to drive multiple groups of pay-off disks distributed on the large turntable to rotate and strand. The multi-stage backtwist gear set is installed on the large turntable, and the pay-off disk is installed on the backtwist gear of the multi-stage backtwist gear set through the pay-off disk seat, which is used to make the pay-off disk rotate and backtwist in the opposite direction while revolving with the large turntable. The die seat is installed at the rear end of the main shaft.

[0005] This patent primarily addresses the problem of untwisting when monofilaments rotate in opposite directions, but it has the following drawbacks: 1. There is a distance between the outlet end of the monofilament strand and the stranding drum. When the outlet end is tightened to straighten the monofilament strand, the tension applied to the portion of the monofilament strand already wound around the steel core disappears, causing the originally straightened monofilament strand to slightly arch again. 2. The monofilament pay-off guide wheel lacks a structure for pre-twisting the monofilament. After winding, the monofilament still experiences torsional elastic stress, causing the sparsely wound, expanded-diameter wire to scatter after being cut. Summary of the Invention

[0006] The purpose of the present invention is to provide a spacing positioning device for sparsely wound expanded diameter steel core aluminum stranded wire to solve the problem that the straightening tension of the single-filament aluminum stranded wire disappears after it is wound on the steel core, causing the single-filament aluminum stranded wire to bulge.

[0007] Basic solution: A spacing and positioning device for sparsely wound and expanded diameter steel core aluminum stranded wire, the steel core passes through the center of the mold, the mold is provided with a straight wire-passing hole, the monofilament passes through the wire-passing channel, the mold is set as a single-layer structure, the mold is rotatably connected to the steel core, the monofilament is wound around the steel core through the rotation of the mold and is compressed by a clamping disk, and the mold is set as an expanded diameter trumpet shape; a plurality of wire-passing holes are provided on the mold, which are equidistant and evenly distributed on the circumference, and the path of the wire-passing holes is the same as the mold contour; a wire tightening mechanism is provided inside the wire-passing hole, and the monofilament is in sliding contact with the wire tightening mechanism; the wire-passing hole is located at one end of the expanded diameter trumpet shape and an inner-drawn aluminum wire reel is provided.

[0008] Beneficial effects and technical principles:

[0009] 1. In conventional stranding machines, the outlet end of the monofilament stranded wire is not fixed to the stranding machine and does not rotate with the stranding machine, resulting in the problem of self-twisting of the outlet end. To address this problem, conventional twisting devices are used to twist the outlet end at the rear of the stranding machine during its rotation. These twisting devices are complex and occupy a small space. This solution fixes the aluminum wire reel to the mold, and uses an internal pull-out method for the outlet. The aluminum wire reel rotates with the mold, preventing the outlet end from twisting, thus fundamentally solving the problem of self-twisting of the monofilament stranded wire caused by rotational winding.

[0010] 2. When the monofilament stranded wire is wound on the steel core without being straightened, the surface of the sparsely wound wire after forming will be raised and become lantern-shaped. The stranding machine in the existing technology is equipped with a thin plate-shaped stranding drum. The rotation of the stranding drum drives the winding of the monofilament stranded wire. There is a distance between the outlet end of the monofilament stranded wire and the stranding drum. The monofilament stranded wire is straightened by tightening the outlet end. However, straightening the monofilament aluminum stranded wire cannot shape the monofilament aluminum stranded wire. The bent monofilament aluminum stranded wire is in a straight state when straightened and tensioned. However, after winding, the tensioning force on the outlet end of the monofilament stranded wire that has been wound on the steel core disappears, and the originally straightened monofilament stranded wire will be slightly arched again. The tightening mechanism used in this solution is arranged in the wire through hole. During the stretching process of the monofilament aluminum stranded wire, friction is generated with the tightening mechanism. The monofilament aluminum stranded wire is wrapped around one end of the steel core and fixed. The tightening mechanism can not only straighten the monofilament aluminum stranded wire, but also extrude and reshape the outer periphery of the bent monofilament aluminum stranded wire as the mold rotates. Even after the tensioning force disappears, the monofilament aluminum stranded wire that has been wrapped will not arch.

[0011] 3. Monofilament aluminum stranded wire is a metal stranded wire with elasticity. The existing technology uses a thin plate-shaped stranded wire drum to wind the monofilament aluminum stranded wire on a steel core. The thin plate-shaped stranded wire drum twists the monofilament aluminum stranded wire during rotation to make it wound on the steel core. The twisting process will cause the monofilament aluminum stranded wire to generate elastic stress. After the sparsely wound wire is cut off, the aluminum stranded wire will produce a scattered phenomenon under the action of the elastic stress. In this solution, the mold of the stranded wire adopts a trumpet shape, and the axial length of the trumpet shape is longer than the stranded wire length of the thin plate-shaped stranded wire drum. In addition, this solution provides a tightening mechanism in the wire through hole. Under the action of the tightening mechanism and the longer mold, the elastic torsional stress at both ends of the monofilament aluminum stranded wire is dispersed to a section of the monofilament aluminum stranded wire located in the mold, which can maintain the shape of the sparsely wound wire after winding and before being pressed by the compression disk, and avoid the phenomenon of arching and bulging after the compression disk is pressed.

[0012] Preferred Solution 1: As a further optimization of the basic solution, the mold includes an inner and outer spacer mold, with the outer spacer mold rotatably connected to the outer surface of the inner spacer mold. The mold is configured as an inner and outer layer structure, allowing the inner and outer layers to rotate simultaneously, allowing the inner and outer layers of the steel core to be wound simultaneously, improving winding efficiency.

[0013] Preferred Option 2: As a further optimization of Preferred Option 1, the inner spacing mold is provided with 6 wire through-holes, and the outer spacing mold is provided with 12 wire through-holes. In the manufacturing process of the compacted conductor, 6 strands are arranged in the innermost layer, and 12 strands are arranged in the next innermost layer. This arrangement of strands helps prevent wire snagging, and corresponding wire through-holes are provided in the mold for the strands to pass through.

[0014] Preferred Option 3: As a further optimization of Preferred Option 2, the tensioning mechanism is provided with a straightening roller, which is mounted on the inner wall of the wire-passing hole via a bracket. The bracket is provided with a spring that allows the straightening roller to radially extend and retract. The straightening roller contacts the monofilament strand, which stretches as it winds around the steel core. As the monofilament strand stretches, it moves relative to the straightening roller, creating friction between the straightening roller and the strand. This straightens the bent monofilament and keeps it taut, preventing the monofilament from becoming loose after being wound around the steel core.

[0015] Preferred Solution 4: As a further optimization of Preferred Solution 3, the monofilament outlet of the thread-passing hole is rounded, and a wear-resistant ceramic protective layer is provided at the rounded corners. The rounded corners at the outlet of the thread-passing hole and the wear-resistant ceramic protective layer at the rounded corners protect the outer periphery of the monofilament from wear, maintain the surface integrity of the monofilament, and protect the mold.

[0016] Preferred Option 5: As a further optimization of Preferred Option 4, the outer spacing mold is provided with an outer sprocket at one end of the trumpet-shaped expanded diameter, which is connected to the outer chain; the inner spacing mold is provided with an inner sprocket at one end of the trumpet-shaped expanded diameter, which is connected to the inner chain. Both the outer and inner spacing molds are provided with sprockets, each connected to a corresponding chain. The chains are driven by an external drive mechanism, facilitating the rotation of the inner and outer molds.

[0017] Preferred Option 6: As a further optimization of Preferred Option 5, the linear speed of the outer sprocket is 0.8-1.0 times that of the inner sprocket. The linear speed of the outer sprocket is 0.8-1.0 times that of the inner sprocket. The sprocket speed is slower than that of the inner sprocket, which can make the outer fixed-distance mold rotate slightly slower than the inner fixed-distance mold. The steel core is wrapped with the outer monofilament stranded wire after the inner monofilament stranded wire is wrapped. When the rotation speed of the outer fixed-distance mold is equal to that of the inner fixed-distance mold, the inner monofilament stranded wire is first wrapped for 20 cm before the outer fixed-distance mold is started to synchronously wrap the outer monofilament stranded wire. The outer layer's twist pitch is larger than the inner layer's twist pitch, facilitating synchronous twisting of the inner and outer layers during rotation.

[0018] Preferred solution seven: As a further optimization of preferred solution six, the inner and outer fixed-distance molds are 25-50cm long along the central axis. The stranding part of the existing stranding machine is a disc-shaped thin plate, and the length of the wire-passing hole is about 5cm. The wire-passing hole is a straight hole. After the monofilament passes through this stranding machine and is wound on the steel core, there is still torsional elastic stress; the length of the trumpet-shaped mold in the central axis direction can be set to 25cm, the wire-passing hole is long and inclined, and a tightening mechanism is set in the wire-passing hole. When the fixed-distance mold rotates, the monofilament is pre-twisted in the wire-passing hole, avoiding the torsional elastic stress of the monofilament stranded wire, changing elasticity to plasticity, making the sparsely wound and expanded-diameter wire after stranding very smooth, eliminating the scattered flower phenomenon after cutting; when the central axis length of the fixed-distance mold is set to 35cm, the effect of eliminating the elastic stress of the monofilament stranded wire is the best, and when the central axis length of the fixed-distance mold is 50cm, the elastic stress of the monofilament stranded wire can still be eliminated.

[0019] Preferred Option 8: As a method of using a spacing positioning device for sparsely winding and expanding steel-core aluminum stranded wire, after the two operations of threading and winding, the inner layer spacing mold and the outer layer spacing mold are controlled to rotate in opposite directions, so that the monofilaments are wound on the steel core during rotation. When the rotation directions are the same, the winding directions of the inner and outer layers of monofilaments are the same, and when the rotation directions are opposite, the winding directions of the monofilaments are opposite. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the sparsely wound and expanded diameter steel core;

[0021] Figure 2 is a cross-sectional view of an embodiment of the present invention;

[0022] Figure 3 It is a right side view of an embodiment of the present invention;

[0023] Figure 4 for Figure 2 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The figure marks in the drawings of the specification include: steel core 1, steel core wound part 101, steel core unwound part 102, monofilament aluminum stranded wire 2, aluminum wire reel 201, inner layer spacing mold 10, outer layer spacing mold 11, wire through hole 12, monofilament stranded wire outlet 20, monofilament stranded wire inlet 21, straightening roller 30, pressing disk 40, rotating inner sprocket 51, rotating outer sprocket 52.

[0026] Glossary:

[0027] Twisting pitch: The distance a single wire travels when it rotates one circle along the strand axis is called the twisting pitch, and the ratio of the pitch to the diameter is called the pitch-to-diameter ratio or pitch multiple.

[0028] Example 1:

[0029] The embodiment is basically as shown in the attached Figure 2-4 As shown:

[0030] A spacing positioning device for sparsely wound expanded diameter steel core aluminum stranded wire is used to limit the circumferential spacing of stranded wires of the same coating layer on the periphery of a steel core 1. Its main structure includes a spacing die and a wire tightening mechanism.

[0031] As attached Figure 2 As shown, the inner layer positioning mold is shaped like a trumpet, with the left end contracted and the right end widened. The generatrix near the left and right ends is parallel to the centerline. A straight through hole is machined in the center of the inner layer positioning mold for the passage of steel core 1, which is rotatably connected to the inner layer positioning mold. The diameter of steel core 1 is D.

[0032] The inner layer positioning mold is provided with 6 wire-passing holes 12, and the 6 wire-passing holes 12 are evenly distributed on the circumference of the inner layer spacing mold 10. The path of the wire-passing holes 12 is consistent with the outline of the trumpet-shaped inner layer positioning mold, gradually tilting upward from left to right, and the height difference between the left and right ends is 4D. Each wire-passing hole 12 passes through a single-filament aluminum stranded wire 2, the diameter of the single-filament aluminum stranded wire 2 is d, and the diameter of the wire-passing hole 12 is 3d. The left end of the through hole is the single-filament aluminum stranded wire outlet 20, and the outlet end of the single-filament aluminum stranded wire 2 is rounded and an alumina wear-resistant ceramic protective layer is provided at the rounded corner position to protect the single-filament aluminum stranded wire. The aluminum stranded wire 2 will not be worn by the sharp edges of the mold, and the mold will be protected from being pulled by the stranded wire; the right end of the through hole is the single-filament stranded wire entrance 21, and the single-filament aluminum stranded wire 2 is rotated and connected to the aluminum wire reel 201 at the entrance position. The single-filament aluminum stranded wire 2 is wound on the aluminum wire reel 201 as the feeding end of the single wire, and the single-filament aluminum stranded wire 2 uses an internal wire output mode on the aluminum wire reel 201. The internal wire output method is similar to the form of pulling out paper from the axis part of a roll. During the rotation of the inner positioning mold or the outer positioning mold, the single-filament stranded wire is wound around the steel core 1 and the stranded wire wound on the aluminum wire reel is gradually pulled out, and the wire is output in this way.

[0033] The outer surface of the inner layer spacing mold 10 is set to a smooth surface, and the outer layer spacing mold 11 is set on the outer periphery of the inner layer spacing mold 10. The outer layer spacing mold 11 is set to a hollow trumpet shape. The outer layer spacing mold 11 covers the inner layer spacing mold 10. The outer layer spacing mold 11 is rotatably connected to the outer surface of the inner layer spacing mold 10, and the surface of the inner layer spacing mold 10 is provided with a protrusion to prevent the outer layer mold from sliding horizontally; the outer layer mold is supported by a support, and the outer layer mold is rotatably connected to the support; the outer layer spacing mold 11 is also provided with a limit through hole, and the number of the through hole 12 is set to 12. The aperture of the through hole here is the same as the aperture of the through hole on the inner layer spacing mold 10, and an aluminum wire reel 201 is also provided at the entrance of the monofilament stranded wire.

[0034] A tightening mechanism is provided inside the wire through hole 12. Figure 4 As shown, the tensioning mechanism is a straightening roller 30 arranged on the inner wall of the wire through hole 12, and the straightening roller 30 is arranged in the parallel section of each wire through hole 12, and a group is set in the left and right parallel sections of the fixed-distance mold, and each group of straightening rollers 30 is provided with 4. Each straightening roller 30 is installed on the inner wall of the wire through hole 12 through a bracket, and a spring that can be expanded and contracted along the radial direction of the through hole is installed on the bracket. The radially contracted spring can squeeze the straightening rollers on both sides when the monofilament stranded wire passes through to leave a gap for the monofilament stranded wire to pass through. After the monofilament stranded wire passes between the straightening rollers, the tension spring recovers its extension to make the straightening roller contact with the outer wall of the monofilament stranded wire. The monofilament stranded wire gradually stretches in the process of winding around the steel core 1. The monofilament stranded wire passes between the straightening rollers 30, and the rolling friction between the rollers and the monofilament stranded wire can straighten the bent monofilament stranded wire. The straightening rollers 30 at the left and right ends press the monofilament stranded wire to put it in a taut state.

[0035] As attached Figure 2 , Attachment Figure 3 As shown, the right end face of the inner positioning mold is provided with a rotating inner sprocket 51, which is driven by the inner chain, and the right end face of the outer positioning mold is provided with a rotating outer sprocket 52, which is driven by the outer chain; the linear speed of the outer sprocket is 0.8 times the linear speed of the inner sprocket. When it is 0.8 times, the speed of the outer sprocket is less than the speed of the inner sprocket, which can make the rotation speed of the outer spacing mold 11 slightly smaller than that of the inner spacing mold 10, and the steel core 1 is wrapped on the outer monofilament strand after the inner monofilament strand is wrapped.

[0036] The left end of the steel core 1 is the wound part 101, which is a sparsely wound and expanded diameter steel core 1. The wound part 101 is slidably connected to a clamping plate 40, and the clamping plate 40 is provided with a through hole for the steel core 1 after being coated with two layers of monofilament stranded wire. The clamping plate 40 is installed by a bracket and can rotate relative to the bracket. The part of the steel core 1 located at the right end of the clamping plate 40 is the unwound part, which is the steel core 1. The inner mold rotates at a speed of 30r / min, and the steel core 1 moves uniformly to the left at a speed of 0.5m / min. The clamping plate 40 rotates relative to the aluminum stranded wire of the steel core 1. The rotation of the clamping plate is driven by an external belt to clamp the inner and outer layers of the stranded wire that have been wound tightly to the internal steel core 1 to avoid forming an angle between the stranded wire and the steel core 1, which causes the stranded wire to loosen and "stand like a lantern".

[0037] The specific implementation process is as follows:

[0038] Threading: Install the aluminum wire drum 201 on the right end surfaces of the inner and outer layers of the fixed-distance mold respectively, and draw the single-filament stranded wire from the inside of the aluminum wire drum 201 and pass it through the wire through hole 12.

[0039] Winding: Pass the steel core 1 through the central axis of the inner spacing mold 10. Secure the ends of the inner monofilament strands to the steel core 1 with wire or a clamp. After rotating the inner clamp to wind the steel core 1 5 cm, secure the outer monofilament strands to the steel core 1 2-5 cm from the left end with wire or a clamp. Rotate the entire clamp to wind the inner and outer strands together 5 cm. Then, place the compression plate 40 over the expanded steel core 1. The inner and outer spacing molds 10 and 11 can rotate in the same or opposite directions. When rotating in the same direction, the monofilament strands are wound in the same direction. When rotating in opposite directions, the monofilament strands are wound in opposite directions, resulting in a grid-like pattern of interlaced inner and outer layers of the stranded conductors.

[0040] Compared with the wire twisting machine in the prior art, the trumpet-shaped inner and outer layer molds have a horizontal length that can be set to 25-50cm. The wire through hole 12 is longer and inclined. A tightening mechanism is provided in the wire through hole 12. When the fixed-distance mold rotates, the monofilament is pre-twisted in the wire through hole 12. The monofilament avoids the torsional elastic stress existing in the monofilament and changes elasticity into plasticity, so that the sparsely wound and expanded diameter wire after twisting is very fit, eliminating the scattered flower phenomenon after cutting.

[0041] Example 2:

[0042] The difference between Example 2 and Example 1 is that Figure 1 For wires that need to be wound in 3 or 4 layers, spacing molds can be further added around the outer layer spacing mold 11 in Example 1 to form a 3-layer or 4-layer spacing mold. The wire passing channel on the spacing mold can be changed according to the number of strands. Specific embodiment:

[0044] The specific implementation of Example 2 is similar to that of Example 1, and the pitch diameter ratio of its monofilament strands is as follows:

[0045]

[0046] Example 3:

[0047] The difference between Example 3 and Example 1 is that: the linear speed of the outer sprocket is 1.0 times the linear speed of the inner sprocket. When the rotation speed of the outer layer fixed-distance mold 11 is equal to the rotation speed of the inner layer fixed-distance mold 10, the inner layer single-filament aluminum stranded wire 2 is first wound 20 cm and then the outer layer fixed-distance mold 11 is started to synchronously wind the outer layer single-filament stranded wire. The twisting pitch of the outer layer is larger than the twisting pitch of the inner layer, which facilitates the synchronous twisting of the inner and outer layers during rotation.

[0048] Example 4:

[0049] The difference between Example 4 and Example 3 is that the linear speed of the outer sprocket is 0.9 times the linear speed of the inner sprocket. The speed of the outer sprocket is lower than the speed of the inner sprocket, which can make the rotation speed of the outer layer fixed-distance mold 11 slightly lower than that of the inner layer fixed-distance mold 10. The steel core 1 is wrapped on the outer layer of monofilament stranded wire after the inner layer monofilament stranded wire is wrapped.

[0050] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A spacing and positioning device for sparsely winding expanded diameter steel-cored aluminum stranded wire, wherein the steel core passes through the center of a die, a straight wire-passing hole is provided on the die, and the monofilament passes through the wire-passing channel. The die is rotatably connected to the steel core, and the monofilament is wound around the steel core through the die rotation and compressed by a compression plate, characterized by: The mold is set to an expanded trumpet shape; a plurality of wire-passing holes are set on the mold, which are evenly distributed on the circumference at equal intervals, and the path of the wire-passing holes is the same as the mold contour; a wire-tightening mechanism is set inside the wire-passing hole, and the monofilament is in sliding contact with the wire-tightening mechanism; an inner-drawn aluminum wire disk is set at one end of the wire-passing hole located in the expanded trumpet shape, and the mold includes an inner-layer fixed-distance mold and an outer-layer fixed-distance mold, and the outer-layer fixed-distance mold is rotatably connected to the outer surface of the inner-layer fixed-distance mold, and a straightening roller is set on the tensioning mechanism, and the straightening roller is installed on the inner wall of the wire-passing hole through a bracket, and the bracket is provided with a spring that can make the straightening roller extend and retract radially, and an outer sprocket is set at one end of the trumpet-shaped expanded diameter of the outer layer fixed-distance mold, and the outer sprocket is connected to the outer chain, and an inner sprocket is set at one end of the trumpet-shaped expanded diameter of the inner layer fixed-distance mold, and the inner sprocket is connected to the inner chain.

2. The spacing and positioning device for sparsely wound and expanded diameter steel-core aluminum stranded wire according to claim 1, characterized in that: The inner layer spacing mold is provided with 6 wire passing through holes, and the outer layer spacing mold is provided with 12 wire passing through holes.

3. The spacing and positioning device for sparsely wound and expanded diameter steel-core aluminum stranded wire according to claim 1, characterized in that: The monofilament outlet position of the wire through hole is provided with a rounded corner, and a wear-resistant ceramic protective layer is provided at the rounded corner position.

4. The spacing and positioning device for sparsely wound and expanded diameter steel-core aluminum stranded wire according to claim 1, characterized in that: The linear speed of the outer sprocket is 0.8-1.0 times that of the inner sprocket.

5. The spacing and positioning device for sparsely wound and expanded diameter steel-core aluminum stranded wire according to claim 1, characterized in that: The lengths of the inner layer fixed distance mold and the outer layer fixed distance mold along the central axis are 25-50 cm.

6. A method for using the spacing and positioning device for sparsely wound and expanded diameter steel-core aluminum stranded wire according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: after a plurality of monofilaments are drawn out from the inside of an aluminum wire reel, the monofilaments are passed through the wire through holes provided on an inner-layer fixed-distance mold and an outer-layer fixed-distance mold respectively; the inner-layer monofilaments are fixed to the end of a steel core; the inner-layer fixed-distance mold is rotated so that the inner-layer monofilaments are wrapped around the steel core by 5 cm; the outer-layer monofilaments are fixed at a position 2-5 cm away from the end of the steel core; the inner-layer fixed-distance mold and the outer-layer fixed-distance mold are rotated at the same time so that the inner and outer-layer monofilaments are wrapped around the steel core by 5 cm together; the inner-layer fixed-distance mold is rotated at a speed of 30 r / min, the steel core moves at a constant speed of 0.5 m / min to the left, and the compression disc is put on the wrapped steel core.

Images