A load-bearing overhead cable installation apparatus

Abstract

The application belongs to the technical field of cable installation equipment, and particularly relates to a bearing type overhead cable installation equipment, which comprises a plurality of clamping discs connected in an up-down mode, a supporting rod installed on the top of the clamping disc, and a cable clamp installed on the top end of the supporting rod. The clamping disc is composed of two clamping plates which are in butt joint with each other. A telescopic connecting rod is arranged between the adjacent clamping discs in an up-down mode. A locking bolt for fixation is symmetrically arranged at one end of the clamping disc. The top of the uppermost clamping disc is provided with the supporting rod. A load-bearing hinge is arranged at the top end of the supporting rod. The supporting rod extends upwards, and the cable clamp is fixed on the load-bearing hinge. The multi-point fixation structure of the plurality of clamping discs uniformly disperses the cable load on the layered folds of the transformer bushing, avoids the downward pulling force / lateral pulling force formed by the cable dead weight and external force from directly acting on the bushing terminal, significantly reduces the risk of bushing sealing failure, insulation damage and fracture, and solves the core problem of mechanical stress concentration in the traditional installation mode.

Description

Technical Field

[0001] This invention relates to the field of cable installation equipment technology, specifically to a load-bearing overhead cable installation device. Background Technology

[0002] In transformer bottom lead cable installation scenarios, traditional installation methods have long faced problems such as mechanical stress concentration and vibration damage, with specific drawbacks including:

[0003] Existing cable fixing devices are mostly single-point clamping structures, which cannot distribute the cable's own weight and the downward / lateral tensile forces generated by the laying path. These forces act directly on the transformer bushing terminals, easily exceeding the manufacturer's preset maximum torque and axial / lateral load limits, causing bushing seal failure, insulation damage, or even breakage. Furthermore, the lack of suitable layered fixing structures when installing large-section cables further exacerbates the risk of bushing stress exceeding limits.

[0004] Meanwhile, the continuous vibration generated by the transformer operation is directly transmitted to the cable terminals, causing cable oscillation or shaking, which in turn affects the connection position. Existing fixed installations lack dedicated energy-absorbing buffer structures, and long-term vibration severely impacts their reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a load-bearing overhead cable installation device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a load-bearing overhead cable installation device, comprising multiple clamping discs connected vertically, a support rod installed on the top of the clamping discs, and a cable clamp installed on the top of the support rod.

[0007] The clamping plate consists of two mating clamping plates, with a telescopic connecting rod between the upper and lower adjacent clamping plates. Symmetrical locking bolts for fixation are located at one end of each clamping plate. A support rod is located at the top of the uppermost clamping plate, with a load-bearing hinge at its tip. The support rod extends upwards, and the cable clamp is fixed to the load-bearing hinge.

[0008] The cable clamp includes a mounting plate, a fixed clamp, a movable clamp, and a buffer energy-absorbing device. Both the fixed and movable clamps are mounted on the top surface of the mounting plate, and the bottom of the mounting plate is connected to a load-bearing hinge. The movable clamp is movable, and at least one set of energy-absorbing springs is installed between the movable and fixed clamps.

[0009] The buffer energy absorption device includes a main telescopic spring column, a secondary telescopic spring column, and a support plate. The support plate is installed at the top of the main telescopic spring column, and the top surface of the support plate is fixed to the bottom of the mounting plate.

[0010] There are two sets of auxiliary telescopic spring columns, which are installed on both sides of the main telescopic spring column to provide lateral support force to the main telescopic spring column and move synchronously with the main telescopic spring column.

[0011] Preferably, the clamping plates have fixing grooves on their opposite sides, so that during installation, the two clamping plates are clamped onto the transformer bushing and between the layered folds of the transformer bushing.

[0012] The telescopic function of the connecting rod between adjacent clamping discs enables local position adjustment to adapt to different transformer bushing layered folds.

[0013] Preferably, the clamping plate is made of lightweight insulating material. After installation, the clamping plate is used as an insulator to increase the insulation performance of the transformer bushing. The locking bolts are screwed inward laterally to connect the two clamping plates together, completing the assembly and fixation. The locking bolts are also equipped with an insulating outer layer.

[0014] Preferably, the fixed clamp is fixedly installed near the fixed groove, and the movable clamp is installed on the opposite side of the fixed clamp. A slider is provided at the bottom of the movable clamp, and an adjustment groove is provided at the top of the mounting plate near the movable clamp. The slider at the bottom of the movable clamp is engaged in the adjustment groove, allowing the movable clamp to slide and change position within the adjustment groove.

[0015] Preferably, the fixed clamp and the movable clamp simultaneously hold the lower lead cable, so that when the lower lead cable sways, the force is transmitted to the energy-absorbing spring. The adjusting groove runs through the mounting plate to connect the top and bottom, and is used for drainage.

[0016] Preferably, the mounting plate is installed at an angle that is tilted and off-center from the center of gravity. After the lead cable is installed, the center of gravity will be transferred to the buffer energy absorption device through the mounting plate. The mounting plate is rotated on the load-bearing hinge and linked with the buffer energy absorption device.

[0017] Preferably, the auxiliary telescopic spring column has a fixed seat at the end furthest from the main telescopic spring column, and the fixed seat is rotatably mounted on the side wall of the support rod, giving the auxiliary telescopic spring column a linkage effect of up and down rotation. The bottom end of the main telescopic spring column is mounted with a pivot, which facilitates the coordination of the rotation angle with the mounting plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] Effectively disperses mechanical stress and protects transformer bushings: Through the multi-point fixing structure of multiple clamping discs and the telescopic adaptation design of the connecting rod, the cable load is evenly distributed to the layered folds of the transformer bushing, avoiding the direct action of the cable's own weight and external forces on the bushing terminals, significantly reducing the risk of bushing seal failure, insulation damage and breakage, and solving the core problem of mechanical stress concentration in traditional installation methods.

[0020] Multi-stage buffering and energy absorption to resist vibration fatigue damage: The energy-absorbing springs of the cable clamps, together with the main and secondary telescopic spring columns of the buffering and energy-absorbing device, form a multi-stage buffering structure, which can effectively absorb the vibration generated by the operation of the transformer and the instantaneous impact force caused by the swaying of the cable, avoid vibration fatigue cracking of the cable lead sheath, reduce oil leakage of oil-filled cables and tree discharge of high-voltage cables, and extend the service life of the cable.

[0021] Excellent insulation performance enhances safety and reliability: Both the clamping disc and cable clamps are made of lightweight insulating materials (such as lightweight ceramics and epoxy resin). The clamping disc functions as both a fixation device and an insulator, while the cable clamps prevent insulation hazards caused by metal-to-metal contact. This double insulation design significantly improves insulation safety in high-voltage scenarios, reducing the risk of phase-to-phase short circuits and insulation breakdown. Furthermore, the insulation materials are corrosion-resistant and aging-resistant, making them suitable for harsh outdoor environments.

[0022] Highly adaptable and easy to install: The telescopic connecting rod between the upper and lower clamping plates can adapt to the layered fold spacing and tilt angle of transformer bushings of different specifications. The sliding design of the movable clamp through the adjustment groove can adapt to lower lead cables of different diameters, without the need for additional custom accessories. The clamping plates are quickly assembled and fixed by locking bolts. The overall structure is modular, making installation, disassembly, and subsequent maintenance convenient, reducing construction labor intensity and construction time costs.

[0023] The structural design is reasonable, avoiding the risks of water accumulation and corrosion: the regulating groove is designed to run through the top and bottom of the mounting plate, allowing for rapid drainage of rainwater and preventing oxidation of joints and corrosion of components caused by water accumulation. The secondary telescopic spring column of the buffer energy absorption device is rotatably connected via a fixed base, while the bottom of the main telescopic spring column is mounted on a rotating shaft, which can adapt to changes in the direction of cable force, ensuring the stability and continuity of the buffering effect.

[0024] Lightweight design reduces additional load: Both the clamping disc and cable clamps are made of lightweight materials, making the overall device lightweight and not adding extra load burden to the transformer bushing. At the same time, it is easy to carry and install, further improving construction efficiency. Attached Figure Description

[0025] Figure 1 This is a front view of the present invention.

[0026] Figure 2 This is a perspective view of the present invention.

[0027] Figure 3 This is a first three-dimensional schematic diagram of the cable clamp of the present invention.

[0028] Figure 4 This is a second perspective schematic diagram of the cable clamp of the present invention.

[0029] In the diagram: 1 clamping disc, 1-1 clamping plate, 1-2 locking bolt, 1-3 connecting rod;

[0030] 2 support rods, 2-1 load-bearing hinges;

[0031] 3. Cable clamp, 3-1. Mounting plate, 3-2. Fixed clamp, 3-3. Moving clamp, 3-4. Energy-absorbing spring, 3-5. Main telescopic spring column, 3-6. Lifting plate, 3-7. Secondary telescopic spring column, 3-8. Fixing base, 3-9. Adjustment groove. Detailed Implementation

[0032] Please see Figure 1-4 The present invention provides the following technical solution:

[0033] A load-bearing overhead cable installation device includes multiple clamping discs 1 connected vertically, a support rod 2 installed on the top of the clamping discs 1, and a cable clamp 3 installed on the top of the support rod 2.

[0034] The clamping plate 1 consists of two clamping plates 1-1 that are connected to each other. The opposite sides of the clamping plates 1-1 are provided with fixing grooves. During installation, the two clamping plates 1-1 are clamped on the transformer bushing, and further, they can be clamped between the layered folds of the transformer bushing.

[0035] Meanwhile, multiple clamping discs 1 are provided to ensure the stability of the overall device. Telescopic connecting rods 1-3 are provided between adjacent clamping discs 1. The telescopic function of the connecting rods 1-3 is used to adjust the local position between adjacent clamping discs 1, which can adapt to different transformer bushing layered folds.

[0036] The clamping plate 1 is made of lightweight insulating material, such as lightweight ceramic, epoxy resin insulating material, or other similar materials with the same properties. After installation, the clamping plate 1 can also be used as an insulator to increase the insulation performance of the transformer bushing.

[0037] One end of the clamping plate 1 is symmetrically provided with locking bolts 1-2. The locking bolts 1-2 are screwed inward laterally to connect the two clamping plates 1-1 together and complete the assembly and fixation.

[0038] A support rod 2 is provided at the top of the uppermost clamping plate 1. The support rod 2 extends upward, and a load-bearing hinge 2-1 is provided at the top of the support rod 2. The cable clamp 3 is fixed on the load-bearing hinge 2-1.

[0039] The cable clamp 3 includes a mounting plate 3-1, a fixed clamp 3-2, a movable clamp 3-3, and a buffer energy absorption device. The fixed clamp 3-2 and the movable clamp 3-3 are both located on the top surface of the mounting plate 3-1, and the bottom of the mounting plate 3-1 is connected to the load-bearing hinge 2-1.

[0040] The fixed clamp 3-2 is fixedly installed near the fixed groove, and the movable clamp 3-3 is installed on the opposite side of the fixed clamp 3-2. The movable clamp 3-3 is installed movably, and a slider is provided at the bottom of the movable clamp 3-3. An adjustment groove 3-9 is provided on the top of the mounting plate 3-1 near the movable clamp 3-3, and the slider at the bottom of the movable clamp 3-3 is engaged in the adjustment groove 3-9, so that the movable clamp 3-3 can slide and change position within the adjustment groove 3-9.

[0041] At least one set of energy-absorbing springs 3-4 is provided between the movable clamp 3-3 and the fixed clamp 3-2. When the movable clamp 3-3 moves in the adjusting groove 3-9, the fixed clamp 3-2 and the movable clamp 3-3 simultaneously clamp the lower lead cable. When the lower lead cable shakes, the force is transmitted to the energy-absorbing springs 3-4 to achieve buffering and energy absorption.

[0042] The adjusting groove 3-9 passes through the mounting plate 3-1 to connect the top and bottom, preventing water accumulation in rainy weather. The cable clamp 3 is also made of lightweight insulating material, reducing weight while providing insulation.

[0043] The energy-absorbing buffer device includes a main telescopic spring column 3-5, a secondary telescopic spring column 3-7, and a support plate 3-6. The support plate 3-6 is installed at the top of the main telescopic spring column 3-5, and its top surface is fixed to the bottom of the mounting plate 3-1. This allows the mounting plate 3-1 to work in conjunction with the energy-absorbing buffer device to mitigate vibrations. When the mounting plate 3-1 is under stress, it transfers the force downwards to the energy-absorbing buffer device, further improving the energy absorption effect of the lower lead cable. The mounting plate 3-1 is installed at an angle that is tilted and off-center from the center of gravity. After the lower lead cable is installed, the center of gravity is transferred to the energy-absorbing buffer device via the mounting plate 3-1. The mounting plate 3-1's flipping property on the load-bearing hinge 2-1 is used to work in conjunction with the energy-absorbing buffer device.

[0044] Two sets of auxiliary telescopic spring columns 3-7 are provided and installed on both sides of the main telescopic spring column 3-5 respectively. They provide lateral support to the main telescopic spring column 3-5 and move synchronously with the main telescopic spring column 3-5 to further improve the energy absorption and buffering effect.

[0045] The auxiliary telescopic spring column 3-7 has a fixed seat 3-8 at the end away from the main telescopic spring column 3-5, and the fixed seat 3-8 is rotatably mounted on the side wall of the support rod 2, so that the auxiliary telescopic spring column 3-7 has a linkage effect of up and down rotation. The bottom end of the main telescopic spring column 3-5 is mounted with a pivot, which facilitates the coordination with the rotation angle of the mounting plate 3-1.

[0046] The downward / lateral tension caused by the cable's own weight and the laying path directly acts on the transformer bushing terminals. When this tension exceeds the preset maximum torque and axial / lateral load limits, it can lead to bushing seal failure, insulation damage, or even breakage. Furthermore, the vibration generated during transformer operation also affects the cable, causing long-term vibration fatigue cracking of the lead sheath, oil leakage in oil-filled cables, and water ingress into high-voltage cross-linked polyethylene cables, leading to tree discharge. This solution addresses this problem by directly supporting the cable at the connection point between the transformer bushing and the cable.

[0047] This load-bearing overhead cable installation equipment, through its modular structural design, achieves stable fixing, stress dispersion, vibration buffering, and insulation enhancement of the transformer's lower lead cable. The specific working principle is as follows:

[0048] Clamping, fixing, and insulation enhancement principles:

[0049] The device is fixed to the transformer bushing by multiple clamping discs 1 connected in series. Each clamping disc 1 consists of two mating clamping plates 1-1. During installation, the clamping plates 1-1 are attached to the layered folds of the transformer bushing and tightened laterally by locking bolts 1-2, so that the two clamping plates 1-1 form a ring-shaped fixation. The multiple clamping discs 1 are distributed along the axial direction of the bushing to form a multi-point load-bearing structure and distribute the load transmitted by the cable.

[0050] The clamping plate 1 is made of lightweight ceramic or epoxy resin insulating material, which not only achieves a lightweight design, but also functions as an insulator, which can increase the insulation performance of the transformer bushing and avoid the risk of insulation breakdown in high-voltage scenarios.

[0051] Adaptive adjustment principle: The upper and lower adjacent clamping discs 1 are connected by telescopic connecting rods 1-3. According to the spacing and tilt angle of the layered folds of the transformer bushing, the telescopic adjustment of connecting rods 1-3 ensures that each clamping disc 1 can fit tightly against the bushing surface, ensuring the overall installation stability of the device and adapting to different specifications of transformer bushing structures.

[0052] Cable fixing and buffer energy absorption principle: The support rod 2 at the top of the uppermost clamping plate 1 extends upward, and the load-bearing hinge 2-1 at its top is connected to the bottom of the mounting plate 3-1 of the cable clamp 3. The mounting plate 3-1 is designed with an inclined angle that is off-center from the center of gravity, so that the center of gravity of the cable is transferred to the buffer energy absorption device below after installation.

[0053] The fixed clamp 3-2 of the cable clamp 3 is fixed to the top surface of the mounting plate 3-1 near the fixed groove. The movable clamp 3-3 is engaged in the adjustment groove 3-9 of the mounting plate 3-1 by the bottom slider. It can slide along the adjustment groove 3-9 to adjust the distance between the fixed clamp 3-2 and the movable clamp, so as to clamp and fix cables of different diameters. The energy-absorbing spring 3-4 between the fixed clamp 3-2 and the movable clamp 3-3 is in a pre-tight state when the cable is clamped. When the cable shakes due to vibration or external force, the force is transmitted to the energy-absorbing spring 3-4, and the spring extension and contraction achieve initial buffering and energy absorption.

[0054] The lifting plate 3-6 of the buffer energy absorption device is fixed to the bottom of the mounting plate 3-1, and the main telescopic spring column 3-5 is connected below it. Auxiliary telescopic spring columns 3-7 are symmetrically arranged on both sides of the main telescopic spring column 3-5. The end of the auxiliary telescopic spring column 3-7 away from the main telescopic spring column 3-5 is rotatably mounted to the side wall of the support rod 2 via a fixing seat 3-8. When the cable is subjected to downward or lateral force, the mounting plate 3-1 flips via the load-bearing hinge 2-1, causing the lifting plate 3-6 to press against the main telescopic spring column 3-5. Simultaneously, the auxiliary telescopic spring columns 3-7 extend and retract synchronously with the flipping of the mounting plate 3-1, providing lateral support to the main telescopic spring column 3-5. Through the coordinated extension and retraction of the main and auxiliary spring columns, secondary buffer energy absorption is achieved, offsetting the mechanical stress transmitted by the cable. The bottom end of the main telescopic spring column 3-5 is mounted with a rotating shaft, which can adaptively adjust to the rotation angle of the mounting plate 3-1 to ensure the buffering effect.

[0055] The regulating groove 3-9 runs through the mounting plate 3-1 and is connected vertically. During rainy weather, water can be discharged naturally along the regulating groove 3-9, avoiding corrosion problems of components caused by water accumulation.

Claims

1. A load-bearing overhead cable installation device, comprising multiple clamping discs (1) connected vertically, a support rod (2) mounted on the top of the clamping discs (1), and a cable clamp (3) mounted on the top of the support rod (2), characterized in that: The clamping plate (1) consists of two clamping plates (1-1) that are connected to each other. A telescopic connecting rod (1-3) is provided between the upper and lower adjacent clamping plates (1). A locking bolt (1-2) for fixing is symmetrically provided at one end of the clamping plate (1). A support rod (2) is provided at the top of the uppermost clamping plate (1). A load-bearing hinge (2-1) is provided at the top of the support rod (2). The support rod (2) extends upward and the cable clamp (3) is fixed on the load-bearing hinge (2-1). The cable clamp (3) includes a mounting plate (3-1), a fixed clamp (3-2), a movable clamp (3-3), and a buffer energy absorption device; the fixed clamp (3-2) and the movable clamp (3-3) are both set on the top surface of the mounting plate (3-1), and the bottom of the mounting plate (3-1) is connected to the load-bearing hinge (2-1); the movable clamp (3-3) is installed in a movable manner, and at least one set of energy-absorbing springs (3-4) is provided between the movable clamp (3-3) and the fixed clamp (3-2); The buffer energy absorption device includes a main telescopic spring column (3-5), a secondary telescopic spring column (3-7), and a lifting plate (3-6). The lifting plate (3-6) is installed at the top of the main telescopic spring column (3-5), and the top surface of the lifting plate (3-6) is fixed to the bottom of the mounting plate (3-1). Two sets of auxiliary telescopic spring columns (3-7) are provided and installed on both sides of the main telescopic spring column (3-5) respectively, providing lateral support force to the main telescopic spring column (3-5) and moving synchronously with the main telescopic spring column (3-5).

2. The load-bearing overhead cable installation equipment according to claim 1, characterized in that: The clamping plates (1-1) have fixing grooves on their opposite sides. During installation, the two clamping plates (1-1) are clamped on the transformer bushing and between the layered folds of the transformer bushing. The adjacent clamping discs (1) can be locally adjusted by using the telescopic function of the connecting rods (1-3) to adapt to different transformer bushing layered folds.

3. The load-bearing overhead cable installation equipment according to claim 1, characterized in that: The clamping plate (1) is made of lightweight insulating material. After installation, the clamping plate (1) is used as an insulator to increase the insulation performance of the transformer bushing. The locking bolt (1-2) is screwed inward laterally to connect the two clamping plates (1-1) together to complete the assembly and fixation. The locking bolt (1-2) is also provided with an insulating outer layer.

4. The load-bearing overhead cable installation equipment according to claim 1, characterized in that: The fixed clamp (3-2) is fixedly installed on one side near the fixed groove, and the movable clamp (3-3) is installed on the opposite side of the fixed clamp (3-2). A slider is provided at the bottom of the movable clamp (3-3), and an adjustment groove (3-9) is provided at the top of the mounting plate (3-1) near the movable clamp (3-3). The slider at the bottom of the movable clamp (3-3) is engaged in the adjustment groove (3-9), so that the movable clamp (3-3) slides and changes position in the adjustment groove (3-9).

5. The load-bearing overhead cable installation equipment according to claim 4, characterized in that: The fixed clamp (3-2) and the movable clamp (3-3) simultaneously clamp the lower lead cable. When the lower lead cable sways, the force is transmitted to the energy-absorbing spring (3-4). The adjusting groove (3-9) passes through the mounting plate (3-1) to connect the upper and lower parts and is used for drainage.

6. The load-bearing overhead cable installation equipment according to claim 1, characterized in that: The mounting plate (3-1) is installed at an angle that is tilted and off-center from the center of gravity. After the lead cable is installed, the center of gravity will be transferred to the buffer energy absorption device through the mounting plate (3-1). The mounting plate (3-1) is rotated on the load-bearing hinge (2-1) and linked with the buffer energy absorption device.

7. The load-bearing overhead cable installation equipment according to claim 1, characterized in that: The auxiliary telescopic spring column (3-7) is provided with a fixed seat (3-8) at the end away from the main telescopic spring column (3-5), and the fixed seat (3-8) is rotatably installed on the side wall of the support rod (2), so that the auxiliary telescopic spring column (3-7) has a linkage effect of up and down rotation; the bottom end of the main telescopic spring column (3-5) is installed with a rotating shaft, which is convenient to match the rotation angle of the mounting plate (3-1).

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