Bridge clamp for additional conductor

Abstract

The application relates to a bridge clamp for additional conductor, comprising: a fixed base, an additional conductor is clamped and fixed on the fixed base through a clamping assembly; and two groups of pre-twisted wire pieces, a non-clamping section of the additional conductor is spirally held through the pre-twisted wire pieces, and the pre-twisted wire pieces are clamped and fixed through the clamping assembly at the part of the fixed base; and the clamping assembly is fastened on the fixed base through a fastening assembly. The line clue of the installed additional conductor is in a branch structure at the fixed point, can satisfy the holding force between the bridge clamp and the line clue, and can also improve the fatigue resistance of the line clue. In the case of lightning stroke, the branch structure type can disperse the current, and can ensure that the additional line is not burnt out due to the lightning stroke large current. The power supply accident and economic loss caused by the broken line and collapsed net at the structural fixed point of the additional conductor can be avoided.

Description

Technical Field

[0001] This application relates to the field of electrified railway overhead contact system technology, and more specifically, to a bridge clamp for additional conductors. Background Technology

[0002] When electrified railways are in operation, the overhead contact wires will vibrate due to the passage of trains or natural wind. Under long-term vibration, the wires are prone to fatigue fracture at the exit of PW and GW clamps, causing major accidents such as wire breakage and contact network collapse.

[0003] Currently, several incidents of additional conductors breaking or having broken strands have occurred at the contact wire clamps in actual operation. An existing bridging reinforcement clamp uses pre-twisted wires spanning the clamp to fix the conductor at both ends. However, this solution is only a temporary fix for conductor breakage or strand breakage at the clamp exit. The conductor's movement is not only vertical but also includes torsional movement. When the conductor torsions, the existing conductor bridging reinforcement clamp will torsion synchronously with the conductor, making it susceptible to collisions and wear with other structural components, resulting in intermittent discharge and reduced lifespan.

[0004] In addition, due to weather conditions, the additional conductors of the overhead contact system may be struck by lightning and break or break strands on rainy days. There have been several cases of lightning strikes causing damage to the additional conductors. Utility Model Content

[0005] The purpose of this application is to provide a bridging clamp for additional conductors, which can avoid power supply accidents and economic losses caused by the collapse of the power grid due to wire breakage at the structural fixing point of the additional conductor.

[0006] To achieve the above objectives, this utility model provides a bridging clamp for additional wires, comprising: a fixed base, wherein the additional wire is clamped and fixed on the fixed base by a clamping assembly; And two sets of pre-twisted wire sheets, the non-clamped section of the additional wire is helically held by the pre-twisted wire sheets, and the part of the pre-twisted wire sheets that passes through the fixed base is clamped and fixed by the clamping assembly; The clamping assembly is fastened to the fixed base by a fastening assembly.

[0007] In an optional embodiment, the clamping assembly includes a cover plate and a clamping block distributed vertically, with an additional wire clamped between the clamping block and the fixed base.

[0008] In an optional embodiment, the fixed base includes an L-shaped fixed side plate and a mounting top plate. Both the mounting top plate and the clamping block are provided with thread clearance grooves for clamping the additional wire. The additional wire passes horizontally between the thread clearance grooves, and a thread pad is provided between the additional wire and the thread clearance groove.

[0009] In an optional embodiment, the pre-twisted sheet is composed of multiple pre-twisted monofilaments; The two sets of pre-twisted filaments each include a holding section, a self-twisting section, and an intertwined section, with a bending transition section provided between different sections.

[0010] In an optional embodiment, the gripping section and the self-twisting section are disposed on both sides of the fixed base, and the intertwined section is clamped and fixed between the cover plate and the clamping block.

[0011] In an optional embodiment, both the cover plate and the clamping block are provided with pre-twisted wire clearance grooves for clamping the intertwined segments, the intertwined segments pass horizontally between the pre-twisted wire clearance grooves, and a pre-twisted wire pad is provided between the intertwined segments and the pre-twisted wire clearance grooves.

[0012] In an optional embodiment, the pre-twisted filaments are fastened into a circular tube structure at the location of the intertwined section, or a support rod is provided on the radially inner side of the intertwined section.

[0013] In an optional embodiment, the holding sections of the two sets of pre-twisted wires spirally hold the additional conductor on both sides of the fixed base, the extending direction of the holding sections is parallel to the extending direction of the intertwined sections, and the total cross-sectional area of ​​the two sets of pre-twisted wires is not less than the cross-sectional area of ​​the additional conductor.

[0014] In an optional embodiment, the fastening assembly includes a fastening bolt and a fastening nut. The fastening bolt passes through the mounting top plate, the clamping block, and the cover plate from bottom to top, and the clamping assembly is fastened to the fixed base by the fastening nut.

[0015] In an optional embodiment, both the fixed side plate and the mounting top plate are provided with bolt holes, and the bolt holes on the mounting top plate are provided with internal threads.

[0016] The bridging clamp for the additional conductor in this utility model uses two sets of pre-twisted wires to spirally hold the conductor, and clamps and fixes the pre-twisted wires and the additional conductor to the fixed base through the clamping assembly.

[0017] The additional wires installed have a branched structure at the fixing point, which not only satisfies the gripping force between the bridging clamp and the wire, but also improves the fatigue resistance of the wire.

[0018] In extreme conditions, if the additional conductor breaks at the clamp outlet, the pre-twisted wire branch can still maintain the conductor's stability and electrical continuity. In the event of a lightning strike, the branch structure disperses the current, preventing the additional conductor from burning out due to the large current.

[0019] The fixed base also functions as a support frame, eliminating the need for additional cable support frames during installation and reducing costs.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the main structure of the bridge connector in this application; Figure 2 for Figure 1 A schematic diagram of the side view structure; Figure 3 This is a schematic diagram of the main structure of the fixed base; Figure 4 for Figure 3 A schematic diagram of the side view structure; Figure 5 This is a schematic diagram of the clamping block structure; Figure 6 This is a schematic diagram of the cover plate. Figure 7 This is a schematic diagram of the structure of a single set of pre-twisted wire sheets.

[0023] icon: 1-Fixed base; 11-Fixed side plate; 12-Mounting top plate; 13-Threaded hole; 2-Clamping assembly; 21-Clamping block; 22-Cover plate; 23-Curve clearance groove; 24-Curve pad; 25-Pre-twisted wire clearance groove; 26-Pre-twisted wire pad; 3-Pre-twisted filament sheet; 31-Holding section; 32-Self-twisting section; 33-Intertwined section; 34-Bending transition section; 4-Fastening assembly; 41-Fastening bolt; 42-Fastening nut; 5-Additional wires. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] See Figures 1-2 The bridging clamp for the additional conductor in this application is applicable to the structural fixing point of the additional conductor 5 of the electrified railway contact network, and is used to replace the existing additional conductor 5 clamp and conductor bridging reinforcement clamp.

[0028] The bridging clamp for the additional wire in this utility model includes: a fixed base 1, and the additional wire 5 is clamped and fixed on the fixed base 1 by the clamping assembly 2, so as to realize the clamping and fixing of the additional wire 5 on the fixed base 1.

[0029] And two sets of pre-twisted wire sheets 3, the non-clamped sections of the additional wire 5 located on both sides of the fixed base 1 are spirally held by the two sets of pre-twisted wire sheets 3, which can form a branch fixing structure of the additional wire 5 at the fixed base 1, thereby improving the fatigue resistance of the wire while ensuring the gripping force between the bridging clamp and the wire.

[0030] Combination Figure 7 The two sets of pre-twisted wire sheets 3 also include intertwined sections 33 passing through the fixed base 1. The intertwined sections 33 are the intertwining of the two sets of pre-twisted wire sheets 3. Specifically, the intertwined sections 33 are the parts of the pre-twisted wire sheets 3 that pass through the fixed base 1 and can be clamped and fixed by the clamping assembly 2. This effectively realizes that while the pre-twisted wire sheets 3 are clamped and fixed on the fixed base 1, the additional threads on both sides are gripped and reinforced.

[0031] The clamping assembly 2 is fastened to the fixed base 1 by the fastening assembly 4, which can effectively and reliably fix the additional wire 5 and the pre-twisted wire sheet 3 to the fixed base 1.

[0032] By using the fixed base 1 and clamping assembly 2, reliable fixation of the additional conductor 5 and the pre-twisted wire sheet 3 can be achieved. Simultaneously, the pre-twisted wire sheet 3 holds and reinforces the non-clamped section of the additional conductor 5, forming an integrated reinforcement solution. This fundamentally solves the problems of stress concentration and fatigue fracture at the conductor clamp. Compared to existing PW and GW clamps, it addresses the issue of conductor fatigue fracture at the clamp exit. Furthermore, it avoids the problem of loose connections caused by the original bridging reinforcement clamp colliding with structural components as the conductor rotates.

[0033] See Figures 5-6 In one specific embodiment, the clamping assembly 2 comprises a cover plate 22 and a clamping block 21 distributed vertically. The additional wire 5 is clamped between the clamping block 21 and the fixed base 1, and the intertwined section 33 of the pre-twisted wire sheet 3 is clamped between the cover plate 22 and the clamping block 21. This clamping and fixing relationship provides a symmetrical and stable clamping force distribution, avoids excessive stress at a single point, and protects the structure of the additional wire 5 and the pre-twisted wire sheet 3.

[0034] Combination Figures 3-4 The fixed base 1 specifically includes an L-shaped fixed side plate 11 and a mounting top plate 12. The fixed side plate 11 is mainly used to connect the fixed base 1 to the main support structure, and the mounting top plate 12 is specifically used to clamp the assembly 2, the additional wire 5 and the pre-twisted wire sheet 3 for installation and fixation.

[0035] Both the mounting top plate 12 and the clamping block 21 are provided with wire clearance grooves 23 for clamping the additional wire 5. The wire clearance grooves 23 are all arc-shaped grooves that conform to the cross-sectional shape of the additional wire 5. The additional wire 5 passes horizontally between the wire clearance grooves 23 on the mounting top plate 12 and the clamping block 21, avoiding bending of the additional wire 5. At the same time, wire pads 24 are provided between the additional wire 5 and the wire clearance grooves 23 on the upper and lower sides, effectively preventing the additional wire 5 from being pinched and fretting wear.

[0036] The pre-twisted sheet 3 is composed of multiple pre-twisted monofilaments, and the pre-twisted sheet 3 composed of multiple monofilaments provides extremely high tensile strength and fatigue resistance.

[0037] The two sets of pre-twisted wire sheets 3 each include a holding section 31, a self-twisting section 32, and an intertwined section 33, with bending transition sections 34 provided between different sections. The inner side of the holding section 31 is covered with conductive sand. Specifically, each set of pre-twisted wire sheets 3 is prefabricated before on-site implementation into a shape including two holding sections 31, two self-twisting sections 32, one intertwined section 33, and four bending transition sections 34, and the intertwined sections 33 of the two sets of pre-twisted wire sheets 3 interlock with each other.

[0038] This configuration allows for segmented gripping, self-twisting, and intertwining structural functions. Specifically, the gripping segment 31 disperses stress, the self-twisting segment 32 allows for a certain degree of torsion, and the intertwining segment 33 provides a rigid fixing point.

[0039] The gripping section 31 and the self-twisting section 32 are located on both sides of the fixed base 1, and the intertwined section 33 is clamped and fixed between the cover plate 22 and the clamping block 21. The force flow transmission path is optimized so that the reinforcement range covers the key areas before and after the clamp, while the intertwined section 33, which requires rigid fixation, is placed in the clamping assembly 2, ensuring the stability and reliability of the connection.

[0040] Both the cover plate 22 and the clamping block 21 are provided with pre-twisted wire clearance grooves 25 for clamping the intertwined section 33. The pre-twisted wire sheet 3 is fastened into a circular tube structure at the location of the intertwined section 33, or a support rod is provided on the radially inner side of the intertwined section 33. The circular tube structure significantly improves the torsional and bending resistance of the intertwined section 33 of the pre-twisted wire sheet 3. At the same time, based on the circular tube structure, the support rod can enhance the internal support effect of the intertwined section 33. In summary, it can prevent the intertwined section 33 from excessively deforming when the wire twists, thereby avoiding the risk of collision and poor connection with surrounding structural components.

[0041] Similarly, the pre-twisted wire clearance grooves 25 on the cover plate 22 and the clamping block 21 also include arc-shaped groove structures with the same cross-sectional shape as the intertwined section 33, which can ensure the clamping and fixing effect of the pre-twisted wire sheet 3 between the cover plate 22 and the clamping block 21.

[0042] The intertwined section 33 passes horizontally between the pre-twisted wire clearance grooves 25, and a pre-twisted wire pad 26 is provided between the intertwined section 33 and the pre-twisted wire clearance grooves 25. This achieves reliable clamping of the pre-twisted wire sheet 3 itself, preventing wear and relative sliding between it and the metal clamping block 21. At the same time, the pad acts as a buffer to avoid breakage of the pre-twisted wire sheet 3.

[0043] The holding sections 31 of the two sets of pre-twisted wire sheets 3 spirally hold the additional wire 5 on both sides of the fixed base 1. The extension direction of the holding section 31 is parallel to the extension direction of the intertwined section 33, which ensures the uniform transmission of external stress.

[0044] The total cross-sectional area of ​​the two sets of pre-twisted wires 3 is not less than the cross-sectional area of ​​the additional conductor 5, ensuring that the pre-twisted wires 3 of the bridging clamp can not only provide mechanical reinforcement, but also serve as a parallel current shunting channel for the conductor, improving current carrying capacity and lightning resistance performance, especially in the event of a lightning strike, where a huge current can be shunted.

[0045] By specifying the total cross-sectional area of ​​the pre-twisted wire sheet 3, the contact area between the additional conductor 5 and the pre-twisted wire sheet 3 can be increased, reducing the possibility of lightning strike erosion of the additional conductor 5 and ensuring that the lightning protection wire at the fixed point will not collapse after being broken by lightning in extreme cases.

[0046] The fastening assembly 4 includes a fastening bolt 41 and a fastening nut 42. The fastening bolt 41 passes through the mounting top plate 12, the clamping block 21 and the cover plate 22 from bottom to top, and the clamping assembly 2 is fastened to the fixed base 1 by the fastening nut 42.

[0047] Furthermore, bolt holes are provided on both the fixed side plate 11 and the mounting top plate 12, and the bolt holes on the mounting top plate 12 are provided with internal threads.

[0048] The above structure provides a simple, reliable, and adjustable fastening solution. The internally threaded bolt holes make installation easier, and the connection strength is high with excellent anti-loosening performance.

[0049] In general, the additional conductor bridging clamp of this utility model includes a fixed base 1, a clamping assembly 2, a pre-twisted wire sheet 3, and a fastening assembly 4.

[0050] The fixed base 1 consists of an L-shaped fixed side plate 11 and a mounting top plate 12. The fixed side plate 11 is fixed to the main support structure (such as a utility pole or tower) by bolts. The mounting top plate 12 is horizontally positioned and has two bolt holes with internal threads.

[0051] The clamping assembly 2 includes clamping blocks 21 and cover plates 22 distributed vertically. The upper surface of the clamping blocks 21 and the lower surface of the cover plates 22 are provided with oppositely arranged arc-shaped groove structure wire avoidance grooves 23. The two wire avoidance grooves 23 together form a channel through which the additional wire 5 passes horizontally and is clamped and fixed.

[0052] A line pad 24 is provided between the line avoidance groove 23 and the additional wire 5 to protect the wire and increase friction.

[0053] Similarly, both the clamping block 21 and the cover plate 22 are provided with pre-twisted wire clearance grooves 25 with oppositely arranged arc-shaped groove structures, and a pre-twisted wire pad 26 is provided between the intertwined section 33 of the pre-twisted wire sheet 3 and the pre-twisted wire clearance groove 25.

[0054] The pre-twisted wire sheet 3 consists of two sets of pre-twisted wire bundles, each set being formed by twisting together multiple high-strength pre-twisted wire monofilaments. Each set of pre-twisted wire sheet 3 includes a holding section 31, a self-twisting section 32, and an intertwined section 33, with each section connected by a smooth bending transition section 34. The holding section 31 and the self-twisting section 32 are located on both sides of the fixed base 1, with the holding section 31 spirally holding the non-clamped sections of the additional conductor 5 located on both sides of the fixed base 1.

[0055] The intertwined section 33 is clamped between the clamping block 21 and the pre-twisted wire clearance groove 25 of the cover plate 22. Preferably, the internal structure of the intertwined section 33 is provided with a support rod (not shown in the figure) of a polymer round rod, so as to maintain a stable round tube structure and enhance the torsional stiffness.

[0056] The total cross-sectional area of ​​the two sets of pre-twisted strands 3 is not less than the cross-sectional area of ​​the additional conductor 5, so as to ensure that they can share the mechanical and electrical load of the additional conductor 5.

[0057] The fastening assembly 4 includes two high-strength fastening bolts 41 and matching fastening nuts 42. The fastening bolts 41 pass through the threaded hole 13 of the mounting top plate 12, the through hole of the clamping block 21 and the through hole of the cover plate 22 in sequence from bottom to top, and are finally tightened with the fastening nuts 42, thereby firmly pressing the clamping assembly 2 onto the fixed base 1, and simultaneously clamping and fixing the intertwined section 33 of the additional wire 5 and the pre-twisted wire sheet 3.

[0058] This invention uses pre-twisted wire sheet 3 to provide long-term, high-strength spiral grip on the additional conductors 5 before and after the outlet of the wire clamp, which greatly disperses vibration stress and fundamentally prevents the additional conductors 5 from breaking or breaking due to fatigue.

[0059] The integrated structure of the intertwined section 33 and the pre-twisted wire sheet 3, which enhances rigidity, prevents the entire reinforcing device from twisting excessively with the additional conductor 5, effectively preventing collisions, wear, and discharge with other structural components.

[0060] The two sets of pre-twisted wire sheets 3 are used as parallel conductors, and their total cross-sectional area is not less than that of the conductor. This provides a low-impedance shunt path for the lightning current, prevents the current concentration from causing the additional conductor 5 to melt, and greatly improves the lightning protection level of the system.

[0061] The clamping parts of the pre-twisted wire sheet 3 and the additional conductor 5 are all protected by pads to avoid wear and electrochemical corrosion.

[0062] It should be noted that the additional conductor bridging clamp in this application has multiple functions, including mechanical reinforcement, electrical current diversion, and torsion resistance, which significantly improves the safety and reliability of the additional conductor 5 of the electrified railway contact network.

[0063] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A bridging clamp for additional conductors, characterized in that, include: A fixed base is provided, and additional wires are clamped and fixed to the fixed base by a clamping assembly. And two sets of pre-twisted wire sheets, the non-clamped section of the additional wire is helically held by the pre-twisted wire sheets, and the part of the pre-twisted wire sheets that passes through the fixed base is clamped and fixed by the clamping assembly; The clamping assembly is fastened to the fixed base by a fastening assembly.

2. The bridging clamp for additional conductors according to claim 1, characterized in that, The clamping assembly includes a cover plate and a clamping block distributed vertically, with an additional wire clamped between the clamping block and the fixed base.

3. The bridging clamp for additional conductors according to claim 2, characterized in that, The fixed base includes an L-shaped fixed side plate and a mounting top plate. Both the mounting top plate and the clamping block are provided with thread clearance grooves for clamping the additional wire. The additional wire passes horizontally between the thread clearance grooves, and a thread pad is provided between the additional wire and the thread clearance groove.

4. The bridging clamp for additional conductors according to claim 3, characterized in that, The pre-twisted wire sheet is composed of multiple pre-twisted single filaments; The two sets of pre-twisted filaments each include a holding section, a self-twisting section, and an intertwined section, with a bending transition section provided between different sections.

5. The bridging clamp for additional conductors according to claim 4, characterized in that, The gripping section and the self-twisting section are disposed on both sides of the fixed base, and the intertwined section is clamped and fixed between the cover plate and the clamping block.

6. The bridging clamp for additional conductors according to claim 4, characterized in that, Both the cover plate and the clamping block are provided with pre-twisted wire clearance grooves for clamping the intertwined sections. The intertwined sections pass horizontally between the pre-twisted wire clearance grooves, and a pre-twisted wire pad is provided between the intertwined sections and the pre-twisted wire clearance grooves.

7. The bridging clamp for additional conductors according to claim 4, characterized in that, The pre-twisted wire sheets are fastened into a circular tube structure at the location of the intertwined section, or a support rod is provided on the radial inner side of the intertwined section.

8. The bridging clamp for additional conductors according to claim 4, characterized in that, The holding sections of the two sets of pre-twisted wire sheets spirally hold the additional wire on both sides of the fixed base. The extending direction of the holding sections is parallel to the extending direction of the intertwined sections, and the total cross-sectional area of ​​the two sets of pre-twisted wire sheets is not less than the cross-sectional area of ​​the additional wire.

9. The bridging clamp for additional conductors according to claim 4, characterized in that, The fastening assembly includes fastening bolts and fastening nuts. The fastening bolts pass through the mounting top plate, the clamping block, and the cover plate from bottom to top, and the clamping assembly is fastened to the fixed base by the fastening nuts.

10. The bridging clamp for additional conductors according to claim 4, characterized in that, Both the fixed side plate and the mounting top plate are provided with bolt holes, and the bolt holes on the mounting top plate are provided with internal threads.

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