Wear-resistant crosslinked polyethylene aerial insulated cable

Abstract

This invention relates to the field of overhead cable technology and proposes a wear-resistant cross-linked polyethylene overhead insulated cable, comprising a cable, a flexible sheath, a lifting frame, a swing support assembly, and a wire pressing assembly. The flexible sheath is fitted onto the cable, the lifting frame is suspended from a power support, the cable is placed on the swing support assembly, and a fan-shaped support seat is rotatably connected to the lifting frame, contacting the flexible sheath. When the cable slides axially, it can drive the fan-shaped support seat to rotate. The cable at both sides of the flexible sheath contacts two collars in the wire pressing assembly, which presses the cable downward, causing the flexible sheath to contact the fan-shaped support seat. The flexible sheath can move between the two collars. This technical solution addresses the problem in the prior art where the overhead cable and the hardware clamping part are easily worn, causing damage to the cable sheath.

Description

Technical Field

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

[0002] As the main carrier of power transmission, overhead cables are exposed to the outdoor natural environment for a long time. They are affected by various working conditions such as day and night temperature differences, wind swaying, rain and snow loads. The parts of the overhead cables that are fixed by hardware are the most prone to fretting friction and wear failure. Whether the cable in this part suffers wear failure directly affects the operational stability of the entire line.

[0003] Currently, overhead cables are mostly fixed using rigid clamps, which makes the installation very secure. However, in actual use, on the one hand, in areas with large temperature differences between day and night, the cables will expand and contract with temperature changes, resulting in changes in length. The fixed clamp connection affects the displacement of the cable. At the same time, the cable will swing when affected by wind, which may cause local friction damage to the clamping position. On the other hand, most existing clamps are metal surfaces without a buffer structure, and the parts of the cable that come into direct contact with the clamps are usually not equipped with special protective sheaths. This makes the overhead cables subject to pulling and wear at the contact points with the clamps, resulting in reduced cable life and frequent failures. Summary of the Invention

[0004] This invention proposes a wear-resistant cross-linked polyethylene overhead insulated cable to solve the problem in the prior art where the overhead cable and the hardware clamping part are easily worn, causing damage to the cable sheath.

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

[0006] A wear-resistant cross-linked polyethylene overhead insulated cable includes a cable, a flexible sheath, a mounting frame, a swing support assembly, and a wire pressing assembly. The flexible sheath is fitted onto the cable. The mounting frame is suspended from a power support. The mounting frame is equipped with the swing support assembly and the wire pressing assembly. The cable passes through the mounting frame and the wire pressing assembly. The cable is placed on the swing support assembly. The swing support assembly includes a fan-shaped support seat, which is rotatably connected to the mounting frame and contacts the flexible sheath. When the cable slides axially, it can drive the fan-shaped support seat to rotate. The wire pressing assembly is detachably connected to the cable above it. Two collars in the wire pressing assembly are respectively in contact with the flexible sheath on both sides of the cable. The wire pressing assembly can press the cable downward, so that the flexible sheath contacts the fan-shaped support seat. The flexible sheath can move between the two collars. This application provides elastic support for the cable, allowing it to remain in a mobile state without a fixed connection. When the cable expands or contracts due to heat or swings, it can rotate with the fan-shaped support to complete a certain range of movement. During the cable's movement, the fan-shaped support needs to increase the gravitational potential energy of the cable to passively push the cable back to its original position. The connection between the cable and the hanging frame is an overlap rather than a fixed connection, which reduces the probability of wear on the cable surface.

[0007] The flexible sheath has multiple annular grooves spaced at equal intervals. The fan-shaped support base has a wire groove on the side in contact with the flexible sheath. Multiple U-shaped grooves are spaced at equal intervals within the wire grooves. The annular grooves correspond to the U-shaped grooves. When the cable slides, the annular grooves and U-shaped grooves interlock. This interlocking of the U-shaped grooves and annular grooves creates a gear-like meshing effect, ensuring a tighter fit between the wire grooves and the flexible sheath during cable movement, preventing relative slippage between them.

[0008] The diameter at the end of the flexible sheath is larger than the diameter at the center, allowing the end of the flexible sheath to fit into the conductor groove. When the cable slides a long distance, both ends of the flexible sheath can move into the conductor groove; however, due to the larger diameter at the end of the flexible sheath, there is some resistance when it enters the conductor groove.

[0009] The sector-shaped support base has a pivot hole, and the lifting frame is rotatably connected to the pivot hole. The distance between the pivot hole and the two sides of the conductor groove located in the sector-shaped support base is greater than the distance between the pivot hole and the center of the conductor groove. The pivot hole and the sector-shaped support base are eccentrically arranged, so that when the flexible sheath drives the sector-shaped support base to rotate, the distance between the flexible sheath and the pivot hole varies when the flexible sheath contacts different positions of the annular groove. The distance is closest when the flexible sheath contacts the center of the annular groove. When the cable does not slip or shift, the distance between the flexible sheath and the pivot hole is the shortest. The flexible sheath is positioned at the center of the groove, corresponding to the center of the wire groove. When the flexible sheath moves axially, it causes the fan-shaped support to rotate, so that the side of the fan-shaped support contacts the flexible sheath. The fan-shaped support can then lift the flexible sheath upwards. As the fan-shaped support rotates, it can gradually lift the flexible sheath upwards towards the shaft hole. The fan-shaped support needs to resist the weight of the cable when it rotates. The force of gravity on the cable can also serve as a driving force for the cable to return to its original position, causing the cable to move towards its unslipped position.

[0010] A counterweight is fixedly connected to the side of the sector-shaped support base away from the wire groove. A limit block one is provided on the sector-shaped support base near the pivot hole, and a limit block two is provided on the hoisting frame near the pivot hole. The limit block one can contact the limit block two to limit the rotation angle of the sector-shaped support base. Figure 3 The structure of the sector-shaped support base shown is such that it may be difficult to rotate back to its original position after the sector-shaped support base rotates too much. Limiting block one and limiting block two are set up so that the rotation can stop when the sector-shaped support base rotates to the angle where limiting block one and limiting block two contact, thus avoiding excessive rotation angle. At the same time, the counterweight block can also make the sector-shaped support base rotate to a level angle when connecting the cable to the hoisting frame.

[0011] The wire pressing assembly also includes an elastic plate and a pressure roller. The elastic plate is fixedly connected to the lifting frame. The end of the elastic plate near the cable is fixedly connected to the collar. The cable passes through the collar. The pressure roller is rotatably connected to the collar. The pressure roller contacts the cable above the cable. By pressing the cable downwards with the pressure roller, the flexible sheath can contact the wire groove.

[0012] The working principle and beneficial effects of this invention are as follows:

[0013] 1. In this invention, by setting a fan-shaped support base, the eccentric setting of the fan-shaped support base can support the flexible sheath when the cable length changes or swings, and the flexible sheath pulls the fan-shaped support base to rotate. The resistance to the sliding of the cable is applied by gravity. At the same time, the non-fixed connection between the cable and the fan-shaped support base means that the fan-shaped support base can rotate with the cable when it moves, avoiding the problem of easy wear and tear on the cable sheath in the traditional fixed hanging method.

[0014] 2. In this invention, a collar is provided through which the cable passes, such as... Figure 5 As shown, the collar limits the flexible sheath to prevent the cable from sliding too far when the tension is too great. At the same time, the collar also prevents the cable from shaking upward and separating from the fan-shaped support when the amplitude of the sway is too large, thus limiting the range of movement of the cable. In addition, the collar limits the flexible sheath, which can reduce damage to the surface of the cable.

[0015] 3. In this invention, a swing support component is set up to provide contact support for the cable. When the tension on both sides of the cable is different, the flexible sheath on the cable can slide on the swing support component. While sliding, it still supports the cable and can apply a force to promote the cable's reset. Compared with the traditional fixed connection method, the support method of this application will not cause wear on the cable surface. The pressure component applies a downward pressing force to the cable, making it difficult for the cable to move upward and separate from the swing support component while swaying. At the same time, it avoids the cable's axial movement range being too large, so that the protective layer on the cable surface directly contacts the swing support component. By limiting the cable's range of motion, the cable can move flexibly within a certain range of movement, reducing wear on the cable surface. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall structure from another perspective in this invention;

[0019] Figure 3 This is a schematic diagram of the structure of the fan-shaped support base and the flexible sheath in this invention.

[0020] Figure 4 This is a partial structural diagram of the fan-shaped support base and flexible sheath in this invention from another perspective;

[0021] Figure 5 This is a partial structural diagram of the engagement between the collar and the cable in this invention;

[0022] Figure 6 This is a partial structural diagram of the cooperation between limiting block one and limiting block two in this invention.

[0023] In the diagram: 1. Cable; 2. Flexible sheath; 3. Lifting frame; 4. Fan-shaped support base; 5. Collar; 6. Annular groove; 7. Wire groove; 8. U-shaped groove; 9. Shaft hole; 10. Counterweight; 11. Limiting block one; 12. Limiting block two; 13. Elastic plate; 14. Pressure roller. Detailed Implementation

[0024] 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.

[0025] like Figures 1-6 As shown, this embodiment proposes a wear-resistant cross-linked polyethylene overhead insulated cable, including a cable 1, a flexible sheath 2, a lifting frame 3, a swing support assembly, and a wire clamping assembly. The flexible sheath 2 is fitted onto the cable 1. The lifting frame 3 is suspended from a power support. The lifting frame 3 is equipped with a swing support assembly and a wire clamping assembly. The cable 1 passes through the lifting frame 3 and the wire clamping assembly. The cable 1 is placed on the swing support assembly, which includes a fan-shaped support seat 4. The fan-shaped support seat 4 is rotatably connected to the lifting frame 3 and is in contact with the flexible sheath 2. When the cable 1 slides axially, it can drive the fan-shaped support seat 4 to rotate. The wire clamping assembly is detachably connected to the cable 1 above the cable 1. The cable 1 is located on the flexible sheath 2. The two sides of the cable 1 are in contact with the two collars 5 in the wire pressing assembly. The wire pressing assembly can press the cable 1 downward, so that the flexible sheath 2 contacts the fan-shaped support 4. The flexible sheath 2 can move between the two collars 5. This application keeps the cable 1 in a mobile state by providing elastic support for the cable 1, without fixed connection. When the cable 1 moves due to thermal expansion and contraction or swinging, it can complete a certain range of movement by rotating with the fan-shaped support 4. At the same time, during the movement of the cable 1, the fan-shaped support 4 needs to increase the gravitational potential energy of the cable 1 to do work, and passively push the cable 1 back to its original position by gravity. The connection between the cable 1 and the hanging frame 3 is an overlap, not a fixed connection, which can reduce the probability of wear on the surface of the cable 1.

[0026] The flexible sheath 2 has multiple annular grooves 6 spaced at equal intervals. A wire groove 7 is provided on the side of the fan-shaped support 4 that contacts the flexible sheath 2. The wire groove 7 is arranged linearly around the fan-shaped support 4. Figure 4As shown, to prevent the fan-shaped support 4 from rotating too much when the cable 1 slides a long distance, thus failing to maintain contact with the flexible sheath 2, multiple U-shaped grooves 8 are evenly spaced in the conductor groove 7. The annular groove 6 corresponds to the U-shaped grooves 8. When the cable 1 slides, the annular groove 6 and the U-shaped grooves 8 interlock and connect, as shown. Figure 4-5 As shown, the staggered engagement of the U-shaped groove 8 and the annular groove 6 creates a gear-like meshing effect. When the cable 1 moves, the fit between the conductor groove 7 and the flexible sheath 2 becomes tighter, preventing relative slippage. The interlocking of the U-shaped groove 8 and the annular groove 6 maintains the corresponding length of the flexible sheath 2 and the conductor groove 7, preventing the flexible sheath 2 from sliding in the conductor groove 7 when the cable 1 slides, thus avoiding wear.

[0027] like Figure 3 As shown, the diameter at the end of the flexible sheath 2 is larger than the diameter at the center. The end of the flexible sheath 2 can be adapted to enter the conductor groove 7. When the cable 1 slides a long distance, both ends of the flexible sheath 2 can move into the conductor groove 7. However, due to the larger diameter at the end of the flexible sheath 2, there is a certain resistance when it enters the conductor groove 7.

[0028] The fan-shaped support 4 has a pivot hole 9, and the hoisting frame 3 is rotatably connected to the pivot hole 9, such as... Figure 3-4 As shown, the distance between the two sides of the fan-shaped support 4 and the pivot hole 9 in the wire groove 7 is greater than the distance between the center of the wire groove 7 and the pivot hole 9. The pivot hole 9 and the fan-shaped support 4 are eccentrically set, so that when the flexible sheath 2 drives the fan-shaped support 4 to rotate, the distance between the flexible sheath 2 and the pivot hole 9 is different when the flexible sheath 2 contacts different positions of the annular groove 6. The flexible sheath 2 only contacts the upward-facing side of the fan-shaped support 4, and the distance between the flexible sheath 2 and the pivot hole 9 is the closest when the flexible sheath 2 contacts the center of the annular groove 6. When the cable 1 is not slipping, it contacts the center of the annular groove 6. The center position of the flexible sheath 2 and the wire Corresponding to the center of the groove 7, when the flexible sheath 2 moves axially, it drives the sector support 4 to rotate, so that when the side of the sector support 4 contacts the flexible sheath 2, the contact position of the sector support 4 with the flexible sheath 2 changes. The sector support 4 can support the flexible sheath 2 upward. When the sector support 4 rotates, it can gradually support the flexible sheath 2 above the rotating shaft hole 9. When the sector support 4 rotates, it needs to resist the weight of the cable 1. The effect of gravity on the cable 1 can also be used as the force to drive the cable 1 to return to its original position, so that the cable 1 moves towards the position when it is not sliding, and at the same time, it drives the sector support 4 to rotate towards the horizontal angle.

[0029] like Figure 5-6As shown, a counterweight 10 is fixedly connected to the side of the sector-shaped support 4 away from the wire groove 7. A limit block 11 is provided on the sector-shaped support 4 near the shaft hole 9, and a limit block 2 12 is provided on the hoisting frame 3 near the shaft hole 9. The limit block 11 can contact the limit block 2 12 to limit the rotation angle of the sector-shaped support 4. Figure 3 As shown, the structure of the sector-shaped support base 4 may be difficult to rotate and reset when the rotation angle of the sector-shaped support base 4 is too large. Therefore, limit block 11 and limit block 2 12 are provided. Figure 5 As shown, the fan-shaped support 4 can stop rotating when the limiting block 11 and the limiting block 2 12 are in contact, thus avoiding excessive rotation angle. At the same time, the counterweight 10 can also allow the fan-shaped support 4 to rotate to a level angle when the cable 1 is connected to the hoisting frame 3. In this application, the limiting block 11 and the limiting block 2 12 are both set to a fan shape with an angle of 90 degrees. When the fan-shaped support 4 is kept at a horizontal angle, the limiting block 11 and the limiting block 2 12 are set opposite to each other. The maximum rotation angle of the fan-shaped support 4 is 90 degrees on each side, for a total rotation range of 180 degrees. The rotation stops when it reaches 180 degrees to avoid the cable 1 being lifted up by the fan-shaped support 4 and then falling down part of it when the fan-shaped support 4 is rotating at a large angle. This would prevent the cable 1 from being lifted up and then falling down again when it is reset, and it would still need to resist the effect of gravity when it is reset, thus hindering the reset of the cable 1.

[0030] like Figure 1 and Figure 5 As shown, the wire pressing assembly also includes an elastic plate 13 and a pressure roller 14. The elastic plate 13 is fixedly connected to the lifting frame 3. A collar 5 is fixedly connected to the end of the elastic plate 13 near the cable 1. The cable 1 passes through the collar 5. The pressure roller 14 is rotatably connected to the collar 5. The pressure roller 14 is above the cable 1 and contacts the cable 1. By pressing the cable 1 downward by the pressure roller 14, the flexible sheath 2 can contact the conductor groove 7. When the axial stretching distance of the cable 1 is too far, the end of the flexible sheath 2 will contact the collar 5 and can no longer slide, thus limiting the stretching and sliding range of the cable 1. The use of the elastic plate 13 can prevent the bending radius of the cable 1 from being too small when the cable 1 slides a long distance due to the pressure roller 14 and the fan-shaped support seat 4, thus avoiding damage to the cable.

[0031] In this embodiment, a flexible sheath 2 is fitted over the hoisting position of cable 1. Cable 1 passes through two collars 5. The flexible sheath 2 is placed in the conductor groove 7. The U-shaped groove 8 and the annular groove 6 intersect. When the two sides of cable 1 are stretched or swing, the flexible sheath 2 drives the fan-shaped support 4 to rotate. At the same time, as the rotation angle of the fan-shaped support 4 increases, the flexible sheath 2 is gradually lifted upward. The pressure roller 14 keeps pressing down on cable 1 so that the flexible sheath 2 keeps in full contact with the conductor groove 7. The elastic plate 13 bends. When the fan-shaped support 4 rotates to 90 degrees, it stops rotating. At the same time, the flexible sheath 2 contacts the collar 5. When the cable 1 is in equilibrium under the force on both sides of the hoisting frame 3, the cable 1 slides and drives the fan-shaped support 4 to rotate in the horizontal direction.

[0032] 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 wear-resistant cross-linked polyethylene overhead insulated cable, characterized in that, include: Cable (1); A flexible sheath (2) is fitted onto the cable (1); The hoisting frame (3) is suspended on the power support. The hoisting frame (3) is equipped with a swing support assembly and a wire pressing assembly. The cable (1) passes through the hoisting frame (3) and the wire pressing assembly. The cable (1) is placed on the swing support assembly. The swing support assembly includes a fan-shaped support base (4), which is rotatably connected to the hoisting frame (3). The fan-shaped support base (4) is in contact with the flexible sheath (2). When the cable (1) slides in the axial direction, it can drive the fan-shaped support base (4) to rotate. The wire pressing assembly is detachably connected to the cable (1) above the cable (1). The two collars (5) in the wire pressing assembly are respectively located on both sides of the flexible sheath (2) on the cable (1). The wire pressing assembly can press the cable (1) downward so that the flexible sheath (2) contacts the fan-shaped support base (4). The flexible sheath (2) is capable of moving between the two collars (5).

2. The wear-resistant cross-linked polyethylene overhead insulated cable according to claim 1, characterized in that, The flexible sheath (2) has multiple annular grooves (6) at equal intervals. The fan-shaped support (4) has a wire groove (7) on the side that contacts the flexible sheath (2). The wire groove (7) has multiple U-shaped grooves (8) at equal intervals. The annular groove (6) corresponds to the U-shaped groove (8). When the cable (1) slides, the annular groove (6) and the U-shaped groove (8) interlock and connect with each other.

3. The wear-resistant cross-linked polyethylene overhead insulated cable according to claim 2, characterized in that, The diameter of the end of the flexible sheath (2) is larger than the diameter of the center position, and the end of the flexible sheath (2) can be adapted to enter the wire groove (7).

4. The wear-resistant cross-linked polyethylene overhead insulated cable according to claim 3, characterized in that, The fan-shaped support base (4) is provided with a pivot hole (9), the hoisting frame (3) is rotatably connected to the pivot hole (9), and the distance between the two sides of the fan-shaped support base (4) and the pivot hole (9) in the wire groove (7) is greater than the distance between the center of the wire groove (7) and the pivot hole (9).

5. The wear-resistant cross-linked polyethylene overhead insulated cable according to claim 4, characterized in that, The center of the flexible sheath (2) corresponds to the center of the wire groove (7). When the flexible sheath (2) moves axially, it drives the fan-shaped support (4) to rotate, so that the side of the fan-shaped support (4) contacts the flexible sheath (2). The fan-shaped support (4) can support the flexible sheath (2) upward.

6. The wear-resistant cross-linked polyethylene overhead insulated cable according to claim 4, characterized in that, A counterweight (10) is fixedly connected to the side of the sector support (4) away from the wire groove (7). A limit block one (11) is provided on the sector support (4) near the shaft hole (9). A limit block two (12) is provided on the hoisting frame (3) near the shaft hole (9). The limit block one (11) can contact the limit block two (12) to limit the rotation angle of the sector support (4).

7. The wear-resistant cross-linked polyethylene overhead insulated cable according to claim 2, characterized in that, The wire clamping assembly also includes: An elastic plate (13) is fixedly connected to the hoisting frame (3). The end of the elastic plate (13) near the cable (1) is fixedly connected to the collar (5), and the cable (1) passes through the collar (5). The pressure roller (14) is rotatably connected to the collar (5) and is in contact with the cable (1) above the cable (1).

8. The wear-resistant cross-linked polyethylene overhead insulated cable according to claim 7, characterized in that, By pressing the cable (1) downwards by the pressure roller (14), the flexible sheath (2) can come into contact with the wire groove (7).

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