Medium voltage aluminium alloy overhead cross-linked polyethylene insulated cable

Abstract

The present application relates to overhead cable technical field, propose a kind of medium-voltage aluminum alloy overhead crosslinked polyethylene insulated cable, including clamping clamp assembly, clamping lifting clamp and step adjusting hoisting mechanism, each clamping clamp assembly can be detachably connected with one clamping lifting clamp, multiple clamping lifting clamps are hoisted in step adjusting hoisting mechanism, sliding hook is connected on tower pole, sliding hook is slidably connected with hoisting beam, multiple clamping lifting clamps are respectively hoisted in different positions on hoisting beam, and hoisting position can be adjusted, when sliding hook slides on hoisting beam, the clamping lifting clamps of different positions and the force of the connected clamping clamp assembly are different, the clamping position of the clamping clamp assembly not under stress on pre-stranding protective sleeve can be adjusted at this time, by the above technical scheme, for solving the problem that the adjustment range and stability of medium-voltage aluminum alloy cable in the prior art are limited when the over-traction length is fine-tuned.

Description

Technical Field

[0001] This invention relates to the field of overhead cable technology, and more specifically, to a medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable. Background Technology

[0002] Medium-voltage aluminum alloy overhead cables use medium-strength aluminum alloy conductors and are mainly used in power transmission scenarios such as urban and rural power distribution and new energy grid connection. Because the tensile strength of aluminum alloy conductor cables is much higher than that of pure aluminum conductors and the flexibility is higher than that of copper conductors, aluminum alloy conductor cables have a higher tensile-to-weight ratio and better sag characteristics. That is, under the same tower distance, the arc of cable sag between towers is smaller, which allows for lower tower heights or increased distances between towers, thereby greatly reducing costs and construction difficulty during power grid laying.

[0003] Due to the high tensile-to-weight ratio and characteristics of aluminum alloy cables, higher requirements exist during hoisting operations. Strict control of the cable tension is necessary to prevent excessive stretching. Furthermore, since the elastic modulus of aluminum alloy conductors is lower than that of steel-cored aluminum stranded wire, the over-traction length must be strictly controlled to avoid excessive stress and permanent conductor deformation. In existing technologies, adjusting the over-traction length using adjustable tension clamps requires precise calculations and the use of specialized hoisting hardware or adjustable tension clamps. However, commonly used tension clamps have a limited adjustment range, failing to meet the demands of large adjustments over long spans. Moreover, the adjustment method, relying on bolts and nuts, is susceptible to corrosion from acid rain and acidic gases in coastal and industrial areas, potentially causing loss of fine-tuning capabilities. Summary of the Invention

[0004] This invention proposes a medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable to solve the problem of limited adjustment range and stability in existing medium-voltage aluminum alloy cables when fine-tuning the over-traction length.

[0005] The technical solution of the present invention is as follows:

[0006] A medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable includes multiple cable cores and an insulation layer. The insulation layer is sleeved on the multiple cable cores. It also includes a pre-twisted protective sleeve, cable clamp assemblies, clamping and hoisting clamps, and a step-adjusting hoisting mechanism. The pre-twisted protective sleeve is detachably sleeved on the insulation layer. Multiple cable clamp assemblies are detachably mounted on the pre-twisted protective sleeve, and the cable clamp assemblies can clamp and fix the pre-twisted protective sleeve. Each cable clamp assembly is detachably connected to a clamping and hoisting clamp, which can fix the cable clamp assembly. The step-adjusting hoisting mechanism is hoisted onto a tower. The clamping and hoisting clamps are hoisted on the step-adjusting hoisting mechanism, which includes a hoisting beam and a sliding hook. The sliding hook is connected to the tower and is slidably connected to the hoisting beam. Multiple clamping and hoisting clamps are respectively hoisted at different positions on the hoisting beam, and their hoisting positions can be adjusted. When the sliding hook slides on the hoisting beam, the clamping and hoisting clamps at different positions and the connected clamping clamp assemblies are subjected to different forces. At this time, the clamping position of the clamping clamp assembly that is not subjected to force on the pre-twisted protective sleeve and the hoisting position on the hoisting beam can be adjusted.

[0007] As the position of the sliding hook on the lifting beam changes, the clamping positions of multiple wire clamp assemblies on the pre-twisted protective sleeve can be adjusted sequentially. By sequentially adjusting the clamping positions of the multiple wire clamp assemblies on the pre-twisted protective sleeve in the same direction, the relative position of the pre-twisted protective sleeve and the sliding hook can be adjusted.

[0008] The pre-twisted protective sleeve includes a stranded wire pad and pre-twisted wires. The stranded wire pad is detachably mounted on the insulation layer. A spiral groove is provided on the stranded wire pad. Multiple pre-twisted wires are wound circumferentially around the stranded wire pad and are positioned in the spiral groove. Clips are provided at both ends of the pre-twisted wires to fix the multiple pre-twisted wires. The wire clamp assembly clamps the pre-twisted wires.

[0009] The wire clamp assembly includes an L-shaped connecting rod, a wire clamping component, an angle limiting frame, and a clamping plate. The L-shaped connecting rod is detachably connected to the clamping and lifting wire clamp. The wire clamping component is rotatably connected to the L-shaped connecting rod. An angle limiting frame is provided on the wire clamping component. The L-shaped connecting rod passes through the angle limiting frame. The clamping plate is rotatably connected to the L-shaped connecting rod. Pulling the L-shaped connecting rod can cause the clamping plate and the wire clamping component to clamp and fix the pre-twisted protective sleeve.

[0010] The clamping hoisting clamp includes a U-shaped rod, which is detachably connected to the hoisting beam. A clamping assembly is connected to the U-shaped rod, and the U-shaped rod is connected to the L-shaped connecting rod through the clamping assembly. The clamping assembly can limit the L-shaped connecting rod and the angle limiting frame, so that the clamping plate and the wire clamping component are relatively fixed.

[0011] The lifting beam is provided with an adjustment groove and an offset groove, both of which are horizontally arranged. Multiple U-shaped rods are suspended in the adjustment groove, and the sliding hook is slidably connected in the offset groove. Multiple rollers and gears are rotatably connected to the sliding hook. The rollers are in contact with the offset groove, and a rack is provided in the offset groove. The rack is located in the center of the offset groove, and the rollers are in contact with the two sides of the rack to lift the lifting beam. The gears mesh with the rack.

[0012] Multiple positioning slots are provided in the adjustment groove, and the U-shaped rod can be connected to the positioning slot. An anti-detachment frame is slidably connected to the hoisting beam. The sliding anti-detachment frame can limit the U-shaped rod in the positioning slot and prevent it from sliding freely in the adjustment groove.

[0013] The gear is designed with a small diameter and fewer teeth. It can be driven to rotate using a long-handled wrench or an external motor. Because the gear diameter is very small, the torque is very large when it rotates, which can drive the lifting beam to slide on the sliding hook. This causes the force on different clamping lifting clamps to change, and the clamping lifting clamps and clamping clamp assemblies that are not under force can be adjusted.

[0014] The sliding hook can be detachably connected to the lifting beam. The lifting beam has through holes for fixing the sliding hook, and the lifting beam can be fixed by passing a pin through it.

[0015] The working principle and beneficial effects of this invention are as follows:

[0016] 1. In this invention, two clamping clamp assemblies are combined with clamping hoisting clamps. When the clamping hoisting clamp pulls the clamping clamp assembly, it can clamp the pre-twisted protective sleeve. At the same time, the clamping hoisting clamp can clamp the movable structure on the clamping clamp assembly, thereby fixing and clamping the pre-twisted protective sleeve. After the clamping hoisting clamp is released, the clamping clamp assembly can be moved flexibly. Through multiple movements, the position of the hoisting cable can be adjusted. Compared with the existing adjustable tension clamps, the adjustment speed is faster and the adjustment range is larger.

[0017] 2. In this invention, by setting up a lifting beam and a sliding hook, the sliding hook on the lifting beam can adjust the center offset of the entire lifting device. When the sliding hook slides to the left side of the lifting beam, the left-side clamping assembly is stressed, which can adjust the right-side clamping assembly. By reciprocating the movement of the sliding hook, the positions of the two clamping assemblies can be adjusted respectively, thereby adjusting the position of the cable lifting. At the same time, the force can be applied by adjusting different clamping assemblies, and it can also be used for the maintenance and replacement of the clamping assemblies. This is a function that existing tension clamps do not have. Moreover, due to the creep characteristics of the cable core during operation, it can still be adjusted periodically without replacing the hardware. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a partial structural schematic diagram of the pre-twisted protective sleeve in this invention;

[0021] Figure 3 This is a partial structural diagram of the cooperation between the clamping wire clamp assembly, the clamping and hoisting wire clamp, and the stepping adjustment hoisting mechanism in this invention;

[0022] Figure 4 This is a partial structural diagram of the clamping wire clamp assembly and the clamping lifting wire clamp in this invention;

[0023] Figure 5 This is a partial structural diagram of the cooperation between the lifting beam and the sliding hook in this invention;

[0024] Figure 6 This is a partial structural diagram of the sliding hook and the offset groove in this invention;

[0025] Figure 7 This is a partial structural diagram of the sliding hook and offset groove from another perspective in this invention;

[0026] Figure 8 This is a schematic diagram of the first stage of the process in this invention;

[0027] Figure 9 This is a schematic diagram of the two-stage process in this invention;

[0028] Figure 10 This is a schematic diagram of the three-stage process in this invention.

[0029] In the diagram: 1. Cable core; 2. Insulation layer; 3. Long-handled wrench;

[0030] 101. Stranded wire pad; 102. Pre-stranded wire; 103. Clip;

[0031] 201. L-shaped connecting rod; 202. Wire clamping component; 203. Angle limiting frame; 204. Pressure plate;

[0032] 301. U-shaped rod; 302. Clamping plate one; 303. Clamping plate two;

[0033] 401. Lifting beam; 402. Adjustment groove; 403. Positioning groove; 404. Anti-detachment frame; 405. Offset groove; 406. Rack; 407. Sliding hook; 408. Roller; 409. Gear. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] This embodiment proposes a medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable, comprising multiple cable cores 1 and an insulation layer 2, wherein the insulation layer 2 is sleeved on the multiple cable cores 1, such as... Figures 1-7 As shown, it also includes a pre-twisted protective sleeve, a clamping clamp assembly, a clamping and lifting clamp, and a step-adjusting lifting mechanism. The pre-twisted protective sleeve is detachably fitted onto the insulation layer 2. Multiple clamping clamp assemblies are detachably mounted on the pre-twisted protective sleeve. The clamping clamp assemblies can clamp and fix the pre-twisted protective sleeve, and can also easily loosen their clamping action to facilitate position adjustment. Each clamping clamp assembly is detachably connected to a clamping and lifting clamp, which can fix the clamping clamp assembly and prevent it from loosening, for long-term lifting. The step-adjusting lifting mechanism is mounted on the tower, and multiple clamping and lifting clamps are mounted on the step-adjusting lifting mechanism. The adjustable hoisting mechanism includes a hoisting beam 401 and a sliding hook 407. The sliding hook 407 is connected to the tower and is slidably connected to the hoisting beam 401. Multiple clamping hoisting clamps are respectively hoisted at different positions on the hoisting beam 401, and the hoisting position can be adjusted. When the sliding hook 407 slides on the hoisting beam 401, the clamping hoisting clamps at different positions and the connected clamping clamp assemblies are subjected to different forces. At this time, the clamping position of the clamping clamp assembly that is not subjected to force on the pre-twisted protective sleeve and the hoisting position on the hoisting beam 401 can be adjusted. Multiple clamping clamp assemblies are released-adjusted-clamped in sequence, forming a step-like position adjustment similar to walking.

[0036] As the position of the sliding hook 407 changes on the lifting beam 401, the clamping positions of multiple wire clamp assemblies on the pre-twisted protective sleeve can be adjusted sequentially. By adjusting the clamping positions of multiple wire clamp assemblies in the same direction on the pre-twisted protective sleeve sequentially, the relative position of the pre-twisted protective sleeve and the sliding hook 407 can be adjusted.

[0037] like Figures 1-2 As shown, the pre-twisted protective sleeve includes a stranded wire pad 101 and pre-twisted wires 102. The stranded wire pad 101 is detachably mounted on the insulation layer 2. A spiral groove is provided on the stranded wire pad 101. The stranded wire pad 101 contacts the insulation layer 2, improving the clamping effect of the wire clamp assembly on the insulation layer 2 while avoiding scratches on the surface of the insulation layer 2. Multiple pre-twisted wires 102 are circumferentially wound on the stranded wire pad 101. The pre-twisted wires 102 are set in the spiral groove. Clips 103 are provided at both ends of the pre-twisted wires 102 to fix the multiple pre-twisted wires 102. The wire clamp assembly clamps onto the pre-twisted wires 102 and directly contacts the pre-twisted wires 102, avoiding scratches on the surface of the insulation layer 2 by the wire clamping piece 202 and the pressing piece 204. At the same time, the pre-twisted wires 102 and the stranded wire pad 101 extend the length of the wire clamp assembly's traction on the surface of the insulation layer 2.

[0038] The wire clamp assembly includes an L-shaped connecting rod 201, a wire clamping component 202, an angle limiting frame 203, and a clamping plate 204, such as Figures 3-4 As shown, the L-shaped connecting rod 201 is detachably connected to the clamping hoisting clamp, and the clamping member 202 is rotatably connected to the L-shaped connecting rod 201. An angle limiting frame 203 is provided on the clamping member 202, and the L-shaped connecting rod 201 passes through the angle limiting frame 203. The L-shaped connecting rod 201 can swing in the angle limiting frame 203 to prevent the rotation range of the L-shaped connecting rod 201 from being too large. The pressing plate 204 is rotatably connected to the L-shaped connecting rod 201. Pulling the L-shaped connecting rod 201 can drive the pressing plate 204 and the clamping member 202 to clamp and fix the pre-twisted protective sleeve. Multiple anti-slip textures are provided on the pressing plate 204 and the clamping member 202 at the positions that contact the pre-twisted wire 102. When the clamping hoisting clamp is pulled upward by the hoisting beam 401, it drives the L-shaped connecting rod 201 upward. The L-shaped connecting rod 201 can drive the clamping member 202 and the pressing plate 204 to press the pre-twisted wire 102.

[0039] like Figures 3-4As shown, the clamping and hoisting wire clamp includes a U-shaped rod 301, which is detachably connected to the hoisting beam 401. A clamping assembly is connected to the U-shaped rod 301, which includes a clamping plate 1 302 and a clamping plate 2 303. The clamping plate 1 302 can hoist the end of the L-shaped connecting rod 201, and the clamping plate 2 303 can support the angle limiting frame 203. When the clamping plate 2 303 supports and fixes the angle limiting frame 203, the distance between the clamping plate 1 302 and the clamping plate 2 303 is fixed. At this time, the L-shaped connecting rod 201 can no longer shake, so that the clamping plate 204 and the wire clamping component 202 are relatively fixed.

[0040] The hoisting beam 401 is provided with an adjustment groove 402 and an offset groove 405, such as Figures 5-7 As shown, both the adjusting groove 402 and the offset groove 405 are horizontally arranged. Multiple U-shaped rods 301 are suspended in the adjusting groove 402. According to the weight of the overall cable hoisting and the sag requirements, the hoisting width can be adjusted by the spacing of the two cable clamp assemblies. The sliding hook 407 is slidably connected in the offset groove 405. Multiple rollers 408 and gears 409 are rotatably connected on the sliding hook 407. The rollers 408 are in contact with the offset groove 405 to hoist the hoisting beam 401. A rack 406 is provided in the offset groove 405. The gears 409 mesh with the rack 406. In order to improve the stability of the movement of the rack 406 driven by the gears 409, the rack 406 is set in the center of the offset groove 405. The rollers 408 are in contact with the sides of the rack 406 to hoist the hoisting beam 401.

[0041] like Figure 6 As shown, multiple positioning slots 403 are provided in the adjustment slot 402. The U-shaped rod 301 can be connected to the positioning slot 403. The positioning slot 403 is a semi-circular groove, which can provide the hoisting position of the U-shaped rod 301 and make the position adjustment not too difficult. An anti-detachment frame 404 is slidably connected on the hoisting beam 401. The sliding anti-detachment frame 404 can limit the U-shaped rod 301 in the positioning slot 403. After the anti-detachment frame 404 is fixed, it can clamp the U-shaped rod 301 to prevent it from sliding freely in the adjustment slot 402 during hoisting.

[0042] like Figures 6-7 As shown, gear 409 is configured as a gear with a small diameter and fewer teeth. It can be driven to rotate by a long-handled wrench 3 or an external motor. Since the diameter of gear 409 is very small, its torque is very large when it rotates, which can drive the lifting beam 401 to slide on the sliding hook 407, thereby changing the force on different clamping lifting clamps. The clamping lifting clamps and clamping clamp assemblies that are not under force can be adjusted.

[0043] The sliding hook 407 can be detachably connected to the lifting beam 401. The lifting beam 401 is provided with a through hole for fixing to the sliding hook 407. The lifting beam 401 can be fixed by passing a pin through it. The through hole is located in the center of the lifting beam 401. After fixing, it prevents the lifting beam 401 from sliding freely on the sliding hook 407, making the overall lifting device more balanced and stable.

[0044] The over-traction length adjustment method in this application can be referenced as follows: Figures 8-10 As shown, for ease of explanation, in Figure 8 , Figure 9 and Figure 10 In this diagram, the left-side cable clamp assembly is named A, and the right-side cable clamp assembly is named B. When the cable needs to be pulled to the left, first rotate gear 409 to make the lifting beam 401 slide to the left on the sliding hook 407. When B moves with the lifting beam 401 to below the sliding hook 407, B is subjected to force to lift the cable. At this time, the clamping piece 303 on A can be loosened to allow A to slide on the pre-twisted protective sleeve. Slide A to the right. The current state is... Figure 8 As shown, the lifting beam 401 is slid to the right on the sliding hook 407. When A moves below the sliding hook 407, A is subjected to force, and the state at this time is... Figure 9 As shown, loosen the clamping piece 303 on B, slide B to the right, and then slide the lifting beam 401 on the sliding hook 407 to align it with the center position. The state at this time is as follows. Figure 10 As shown, at this time, A and B move to the right as a whole cable, while the sliding hook 407 remains fixed on the tower. The pre-twisted protective sleeve moves to the left relative to the sliding hook 407, thus pulling the whole cable to the left. After the position adjustment is completed, the clamping piece 303 on A and B is fixed to prevent A and B from loosening the pre-twisted protective sleeve.

[0045] In this embodiment, aluminum alloy cables are hoisted using two clamping assemblies. Compared to traditional tension clamps, this method makes cable hoisting more convenient. When adjusting the traction length, the two clamping assemblies can sequentially adjust their positions in a step-like manner, enabling movement of the overall hoisting position without limitation. Furthermore, due to the structure of the clamping assemblies, minor corrosion does not affect their use. Moreover, the components on the unstressed side can be replaced by changing the stress position, making the method more flexible.

[0046] 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 medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable, comprising a plurality of cable cores (1) and an insulation layer (2), wherein the insulation layer (2) is sleeved on the plurality of cable cores (1), characterized in that, Also includes: A pre-twisted protective sleeve is detachably fitted onto the insulation layer (2); Multiple wire clamp assemblies are detachably mounted on the pre-twisted protective sleeve, and the wire clamp assemblies can clamp and fix the pre-twisted protective sleeve. Multiple clamping and lifting clamps are provided, and each clamping clamp assembly is detachably connected to one clamping and lifting clamp, which can fix the clamping clamp assembly. A step-adjustable hoisting mechanism is hoisted on a tower. Multiple clamping hoisting clamps are hoisted on the step-adjustable hoisting mechanism. The step-adjustable hoisting mechanism includes a hoisting beam (401) and a sliding hook (407). The sliding hook (407) is connected to the tower and is slidably connected to the hoisting beam (401). The multiple clamping hoisting clamps are respectively hoisted at different positions on the hoisting beam (401) and the hoisting position can be adjusted. When the sliding hook (407) slides on the lifting beam (401), the clamping lifting clamps and the connected clamping clamp assemblies at different positions are subjected to different forces. At this time, the clamping position of the clamping clamp assembly on the pre-twisted protective sleeve and the lifting position on the lifting beam (401) can be adjusted.

2. The medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable according to claim 1, characterized in that, As the position of the sliding hook (407) on the lifting beam (401) changes, the clamping positions of multiple wire clamping assemblies on the pre-twisted protective sleeve can be adjusted sequentially. By adjusting the clamping positions of multiple wire clamping assemblies on the pre-twisted protective sleeve in the same direction, the relative position of the pre-twisted protective sleeve and the sliding hook (407) can be adjusted.

3. The medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable according to claim 2, characterized in that, The pre-twisted protective sleeve includes: A stranded wire pad (101) is detachably mounted on the insulating layer (2), and a spiral groove is provided on the stranded wire pad (101); Multiple pre-twisted wires (102) are circumferentially wound on the stranded wire pad (101), and the pre-twisted wires (102) are disposed in the spiral groove; The wire clamp assembly is clamped onto the pre-twisted wire (102).

4. A medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable according to claim 3, characterized in that, The wire clip assembly includes: The L-shaped connecting rod (201) is detachably connected to the clamping and hoisting clamp; The wire clamp (202) is rotatably connected to the L-shaped connecting rod (201). An angle limiting frame (203) is provided on the wire clamp (202), and the L-shaped connecting rod (201) passes through the angle limiting frame (203). The clamping plate (204) is rotatably connected to the L-shaped connecting rod (201). Pulling the L-shaped connecting rod (201) can drive the clamping plate (204) and the wire clamping component (202) to clamp and fix the pre-twisted protective sleeve.

5. A medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable according to claim 4, characterized in that, The clamping and hoisting clamp includes: The U-shaped rod (301) is detachably connected to the hoisting beam (401). A clamping assembly is connected to the U-shaped rod (301). The U-shaped rod (301) is connected to the L-shaped connecting rod (201) through the clamping assembly. The clamping assembly can limit the L-shaped connecting rod (201) and the angle limiting frame (203) so that the clamping plate (204) and the wire clamping piece (202) are relatively fixed.

6. A medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable according to claim 5, characterized in that, The lifting beam (401) is provided with an adjustment groove (402) and an offset groove (405). Both the adjustment groove (402) and the offset groove (405) are arranged horizontally. Multiple U-shaped rods (301) are suspended in the adjustment groove (402), and the sliding hook (407) is slidably connected in the offset groove (405).

7. A medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable according to claim 6, characterized in that, The sliding hook (407) is rotatably connected to multiple rollers (408) and gears (409). The rollers (408) are in contact with the offset groove (405). A rack (406) is provided in the offset groove (405). The gears (409) mesh with the rack (406).

8. A medium-voltage aluminum alloy overhead cross-linked polyethylene insulated cable according to claim 2, characterized in that, The sliding hook (407) can be detachably connected to the lifting beam (401).

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