Anti-cold-flow wedge-shaped strain clamp for overhead insulated conductor
By introducing a composite protective bushing and an axial buffer preload assembly into the wedge-shaped tension clamp, the problem of cold flow deformation of the insulated conductor was solved, realizing the protection and real-time monitoring of the insulation layer, and improving the safety and management level of the line.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG HUIYONG POWER EQUIP CO LTD
- Filing Date
- 2026-03-03
- Publication Date
- 2026-05-15
AI Technical Summary
Existing wedge-shaped tension clamps cannot effectively alleviate cold flow deformation and shear damage to insulated conductors during long-term use, especially at small-span angle towers or terminal towers. This results in thinner insulation layers, making it difficult to detect hidden damage through inspections and affecting line safety.
It adopts a composite protective bushing and an axial buffer preload assembly. The outer layer is a cold-flow resistant, high-modulus insulation layer, and the inner layer is a soft elastic layer. The axial buffer preload assembly provides elastic clamping force, and the fiber optic sensor enables real-time monitoring to ensure that the insulation layer is not damaged. The preload force can be finely adjusted through threaded drive.
It effectively prevents cold flow damage to the insulation layer, ensures the stability of the clamp structure, provides real-time monitoring data support, improves the level of line safety management, simplifies the installation process, and enhances operational safety and efficiency.
Smart Images
Figure CN122051848A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power transmission and distribution line fittings technology, and in particular to a cold-resistant wedge-shaped tension clamp for overhead insulated conductors. Background Technology
[0002] Existing wedge-shaped tension clamps typically consist of a clamp body made of aluminum alloy, a wedge-shaped core block, a pressure plate, and fasteners such as bolts, snap rings, and elastic cylindrical pins. The wedge-shaped core block weds the conductor tightly into the clamp groove of the clamp body, and it is used to fix and anchor overhead conductors at angle towers or terminal towers.
[0003] Existing wedge-shaped tension clamps were originally designed primarily for bare conductors. Their load-bearing capacity relies on the wedge-shaped core and the clamp body applying a large radial pressure to the conductor within a relatively short clamping length. For overhead insulated conductors with outer layers of materials such as polyethylene, the outer insulation of the conductor is subjected to high concentrated stress in this area. During long-term operation, "cold flow" deformation and shear damage will occur, and the insulation thickness will become significantly thinner.
[0004] Hidden damage in short-span, lightly loaded terminals is more difficult to detect. In many rural power distribution lines, the tension of the insulated conductors at terminal towers or small-span corner towers is not high, and the clamp area will not show obvious overheating or external surface damage in the short term. However, the internal insulation layer may separate from the conductor or thin after long-term cold flow, and the conductor strands may break first in the clamping area while the external insulation remains basically intact. This type of hidden damage is difficult to detect through ground inspection. The wedge-shaped core is rigidly locked by bolts and cannot be finely adjusted with the insulation cold flow. Existing products usually use bolts and pressure plates to forcibly lock the wedge-shaped core to the clamp body. Once the conductor is wedge-tightened, the wedge core basically does not move relative to the conductor. When the insulated conductor experiences cold flow or thermal expansion and contraction during operation, the wedge cannot make fine redistribution. As a result, the local insulation layer bears continuous high voltage, and the internal stress is difficult to release.
[0005] Existing standards mainly verify slip load and destructive load. There are very few buffer structures or stress transition structures inside the clamps specifically designed to address the long-term cold flow behavior of the insulation material. This makes it difficult to proactively eliminate these niche issues based on the long-term performance of the material during the design phase. Summary of the Invention
[0006] The purpose of this application is to provide a cold-flow-resistant wedge-shaped tension clamp for overhead insulated conductors.
[0007] Firstly, the anti-cold flow wedge-shaped tension clamp for overhead insulated conductors provided in this application adopts the following technical solution:
[0008] A cold-current-resistant wedge-shaped tension clamp for overhead insulated conductors includes a clamp body with a groove for accommodating the conductor. A wedge-shaped core block is provided at the top of the groove, and a composite protective bushing is provided on the inner wall of the groove. The composite protective bushing is located between the clamp body and the wedge-shaped core block. A pressure plate is fixedly connected to one end of the clamp body, and an axial buffer pre-tightening assembly is provided between the pressure plate and the wedge-shaped core block. The composite protective bushing is an integrated wedge-shaped structure, and its outer wall matches the groove. The composite protective bushing includes an inner layer and an outer layer, with the outer layer fitted onto the outer wall of the inner layer.
[0009] By adopting the above technical solution, when the conductor is placed into the clamping groove of the clamp body and tightened, the wedge-shaped core block is driven by the conductor to wedge into the narrow part of the clamping groove. In this process, the composite protective bushing acts as a key intermediary. Its outer layer contacts the clamp body and the wedge-shaped core block, while its inner layer directly covers the conductor. The axial buffer pre-tightening component applies a continuous initial pre-tightening force to the wedge-shaped core block through the pressure plate. The composite protective bushing isolates the metal parts from the conductor insulation layer, and the axial buffer pre-tightening component provides elastic compression. Structurally, this lays the foundation for preventing cold flow damage to the insulation layer, while maintaining the basic working principle and installation method of traditional wedge clamps, and has good compatibility.
[0010] The inner layer is a soft and elastic insulating material layer, and the outer layer is a cold-flow resistant, high-modulus insulating layer made of a thermoplastic material filled with glass fiber.
[0011] By adopting the above technical solution, when radial pressure is transmitted from the outer layer to the inner layer, the high-modulus outer layer first bears and disperses most of the mechanical stress, and then the soft inner layer contacts and covers the wire insulation layer with a smaller pressure, thus realizing the graded transmission of pressure. The high modulus and cold flow resistance of the outer layer ensure structural stability and long-term shape retention, while the softness of the inner layer provides a buffer, effectively avoiding cold flow deformation of the insulation layer caused by excessive local compressive stress.
[0012] The inner surface of the inner layer of the composite protective bushing is provided with raised texture extending along its axial direction, and the surface of the raised texture is provided with friction strips, and multiple sets of friction strips are provided.
[0013] By adopting the above technical solution, during the pressing process, the raised texture first contacts the insulation layer of the conductor, transforming the surface contact into multiple linear contacts. As the pressure increases, the raised texture deforms, causing the contact area to gradually increase, which limits the maximum compressive strain of the bushing on the insulation layer and plays a mechanical limiting role. Meanwhile, the friction strip increases the shear friction force to share the tension of the conductor, reducing the dependence on pure compressive deformation of the insulation layer and further reducing the risk of cold flow.
[0014] The axial buffer preload assembly includes a guide rod, a preload block, a limiting head, a pressure adjusting plate, a spring, a threaded cylinder, a threaded push rod, and an adjusting knob. Guide rods are connected through both ends of the pressure plate, and the guide rods are slidably connected to the pressure plate. A preload block is fixedly connected to one end of the guide rod near the wedge-shaped core block, and the outer surface of the preload block abuts against the wedge-shaped core block.
[0015] By adopting the above technical solution, the sliding connection between the guide rod and the pressure plate ensures the stability of the force direction, and the pre-tightening block can generate a certain pre-tightening force on the wedge-shaped core block.
[0016] The guide rod is fixedly connected to a limiting head at one end away from the pre-tightening block. The limiting head abuts against the outer surface of the pressure plate. An adjusting plate is provided on one side of the bottom of the pressure plate. A compression spring is connected between the adjusting plate and the limiting head. Multiple sets of compression springs are provided and arranged at equal intervals. The guide rod passes through both sides of the adjusting plate.
[0017] By adopting the above technical solution, when the pressure regulating plate is pushed towards the pressure plate, multiple sets of compression springs are compressed, and the resulting reaction force acts on the wedge-shaped core block through the guide rod and pre-tightening block. The limiting head ensures the force transmission path. The parallel connection of multiple sets of compression springs provides a uniform and considerable elastic pre-tightening force. The elastic characteristics of the compression springs enable the wedge-shaped core block to have the ability to follow elastically. When the insulation layer experiences cold flow, the expansion of the compression springs can push the wedge-shaped core block to follow slightly, automatically compensating for gaps and maintaining stable clamping force.
[0018] The inner wall of the middle part of the pressure plate is connected to a threaded cylinder through a bearing. A threaded push rod is threadedly connected to the inner wall of one end of the threaded cylinder. The end of the threaded push rod away from the threaded cylinder is fixedly connected to the pressure regulating plate. An adjustment knob is fixedly connected to the end of the threaded cylinder away from the pressure regulating plate through the pressure plate.
[0019] By adopting the above technical solution, the screw cylinder is rotated by rotating the adjustment knob, and the screw rod is axially displaced through the screw drive, thereby precisely pushing the pressure adjustment plate to move and changing the compression of the clamping spring. This achieves stepless and precise adjustment of the axial preload. Installers can accurately set the optimal preload according to actual working conditions such as wire type and ambient temperature, ensuring the consistency and optimization of product performance and avoiding problems caused by under-tightening or over-tightening.
[0020] The inner wall of the composite protective bushing is integrated with an optical fiber sensor, which extends along the axial direction of the composite protective bushing. A signal transmission module is provided on one side of the clamp body.
[0021] By adopting the above technical solution, when the composite protective bushing undergoes slight deformation due to changes in clamping force, the optical transmission characteristics of the fiber optic sensor integrated in its inner wall, such as wavelength and intensity, will change accordingly. This signal is collected and transmitted by the signal transmission module, realizing real-time and online monitoring of the clamping force of the line clamp. This makes the long-term, hidden process of preventing cold flow quantifiable and monitorable, providing key data support for predictive maintenance and smart grid management, and greatly improving the level of line safety management.
[0022] The clamp body and the pressure plate are fixedly connected by fastening bolts. An anti-loosening structure is provided between the pressure plate and the clamp body. The anti-loosening structure includes a wedge-shaped anti-loosening washer and a pre-tightening spring. The wedge-shaped anti-loosening washer is sleeved on the outer wall of the fastening bolt, and the surface of the wedge-shaped anti-loosening washer is a wedge-shaped inclined surface. A pre-tightening spring is provided between the wedge-shaped anti-loosening washer and the pressure plate.
[0023] By adopting the above technical solution, when tightening the nut, the inclined surface of the wedge-shaped anti-loosening washer and the contact surface produce an interlocking effect, while the preload spring provides a continuous axial tension. Together, they keep the threaded pair in a taut state, effectively resisting bolt loosening caused by line vibration, and ensuring the long-term reliability of the connection between the clamp body and the pressure plate.
[0024] The clamp body has a guide structure at the clamp groove entrance. The guide structure is funnel-shaped, with its larger end facing the direction of wire entry and its smaller end smoothly connected to the clamp groove. The inner surface of the guide structure has a smooth transition.
[0025] By adopting the above technical solution, when installing wires, the flared guide structure can naturally guide the end of the wire to slide smoothly and accurately into the slot, avoiding collisions with the slot opening, protecting the wire insulation layer from being scratched during installation, simplifying the difficulty of high-altitude operations, and improving installation efficiency and quality. It is a practical innovation that focuses on user experience and operational safety.
[0026] The surface of the guide rod is provided with pre-tightening scale lines.
[0027] By adopting the above technical solution, during installation or inspection, the compression amount of the compression spring can be judged intuitively and quickly by observing the position of the pressure adjusting plate relative to the pre-tightening scale line on the guide rod, thus knowing the approximate range of the pre-tightening force.
[0028] In summary, this application includes at least one of the following beneficial technical effects:
[0029] 1. When the conductor is placed into the clamping groove of the clamp body and tightened, the wedge-shaped core block is driven by the conductor to wedge into the narrow part of the clamping groove. During this process, the composite protective bushing acts as a key intermediary. Its outer layer contacts the clamp body and the wedge-shaped core block, while its inner layer directly covers the conductor. The axial buffer pre-tightening component applies a continuous initial pre-tightening force to the wedge-shaped core block through the pressure plate. The composite protective bushing isolates the metal parts from the conductor insulation layer, and the axial buffer pre-tightening component provides elastic clamping. Structurally, this lays the foundation for preventing cold flow damage to the insulation layer, while maintaining the basic working principle and installation method of traditional wedge clamps, and has good compatibility.
[0030] 2. The threaded drive causes the threaded push rod to move axially, thereby precisely pushing the pressure adjusting plate to move and changing the compression of the clamping spring. This achieves stepless and precise adjustment of the axial preload. Installers can accurately set the optimal preload according to actual working conditions such as wire type and ambient temperature, ensuring the consistency and optimization of product performance and avoiding problems caused by under-tightening or over-tightening. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;
[0032] Figure 2 This is a side view of an embodiment of the present application.
[0033] Figure 3 This is a schematic diagram of the connection structure between the wire clamp body and the wedge-shaped core block in an embodiment of this application;
[0034] Figure 4 This is a schematic diagram of the composite protective bushing structure according to an embodiment of this application;
[0035] Figure 5 This is a schematic diagram of the axial buffer preload assembly structure according to an embodiment of this application;
[0036] Figure 6 This is a schematic diagram of the connection structure between the wire clamp body and the composite protective bushing in an embodiment of this application;
[0037] Figure 7 This is a schematic diagram of the connection structure between the fastening bolt and the anti-loosening structure in an embodiment of this application.
[0038] Explanation of reference numerals in the attached drawings: 1. Cable clamp body; 2. Clamping groove; 3. Wedge-shaped core block; 4. Composite protective bushing; 41. Inner layer; 42. Outer layer; 43. Raised pattern; 5. Pressure plate; 6. Axial buffer pre-tightening assembly; 601. Guide rod; 602. Pre-tightening block; 603. Limiting head; 604. Adjusting plate; 605. Compression spring; 606. Threaded cylinder; 607. Threaded top rod; 608. Adjusting knob; 801. Signal transmission module; 7. Friction strip; 8. Fiber optic sensor; 9. Fastening bolt; 10. Anti-loosening structure; 11. Wedge-shaped anti-loosening washer; 12. Pre-tightening spring; 13. Guide structure; 14. Pre-tightening scale line. Detailed Implementation
[0039] The following is in conjunction with the appendix Figure 1 - Appendix Figure 7 This application will be described in further detail below.
[0040] Example: A cold-current-resistant wedge-shaped tension clamp for overhead insulated conductors includes a clamp body 1, a clamp groove 2 for accommodating the conductor, a wedge-shaped core block 3 at the top of the clamp groove 2, a composite protective bushing 4 on the inner wall of the clamp groove 2, the composite protective bushing 4 being located between the clamp body 1 and the wedge-shaped core block 3, a pressure plate 5 fixedly connected to one end of the clamp body 1, an axial buffer pre-tightening assembly 6 between the pressure plate 5 and the wedge-shaped core block 3, the composite protective bushing 4 being an integrated wedge-shaped structure, the outer wall of the composite protective bushing 4 matching the clamp groove 2, the composite protective bushing 4 including an inner layer 41 and an outer layer 42, the outer wall of the inner layer 41 being fitted with the outer layer 42, wherein... When the conductor is placed into the clamping groove 2 of the clamp body 1 and tightened, the wedge-shaped core block 3 is driven by the conductor to wedge into the narrow part of the clamping groove 2. During this process, the composite protective bushing 4 acts as a key intermediary. Its outer layer 42 contacts the clamp body 1 and the wedge-shaped core block 3, while its inner layer 41 directly covers the conductor. The axial buffer pre-tightening assembly 6 applies a continuous initial pre-tightening force to the wedge-shaped core block 3 through the pressure plate 5. The composite protective bushing 4 isolates the metal parts from the conductor insulation layer, and the axial buffer pre-tightening assembly 6 provides elastic compression. Structurally, this lays the foundation for preventing cold flow damage to the insulation layer, while maintaining the basic working principle and installation method of traditional wedge clamps, and has good compatibility.
[0041] The inner layer 41 is a soft and elastic insulating material layer, and the outer layer 42 is a cold-flow resistant and high-modulus insulating layer composed of a thermoplastic material filled with glass fiber. When radial pressure is transmitted from the outer layer 42 to the inner layer 41, the high-modulus outer layer 42 first bears and disperses most of the mechanical stress. Then, the soft inner layer 41 contacts and covers the wire insulation layer with a smaller pressure, realizing the graded transmission of pressure. The high modulus and cold-flow resistant characteristics of the outer layer 42 ensure structural stability and long-term shape retention, while the softness of the inner layer 41 provides a buffer, effectively avoiding cold-flow deformation of the insulation layer caused by excessive local compressive stress.
[0042] The inner surface of the inner layer 41 of the composite protective bushing 4 is provided with raised texture 43 extending along its axial direction. Friction strips 7 are provided on the surface of the raised texture 43. Multiple sets of friction strips 7 are provided. During the compression process, the raised texture 43 first contacts the insulation layer of the conductor, transforming the surface contact into multiple linear contacts. When the pressure increases, the raised texture 43 deforms, causing the contact area to gradually increase, limiting the maximum compressive strain of the bushing on the insulation layer and playing a mechanical limiting role. The friction strips 7 share the tensile force of the conductor by increasing the shear friction force, reducing the dependence on pure compressive deformation of the insulation layer and further reducing the risk of cold flow.
[0043] The axial buffer preload assembly 6 includes a guide rod 601, a preload block 602, a limiting head 603, a pressure adjusting plate 604, a compression spring 605, a threaded cylinder 606, a threaded push rod 607, and an adjusting knob 608. The guide rod 601 is connected through both ends of the pressure plate 5, and the guide rod 601 is slidably connected to the pressure plate 5. The preload block 602 is fixedly connected to one end of the guide rod 601 near the wedge-shaped core block 3. The outer surface of the preload block 602 abuts against the wedge-shaped core block 3. The sliding connection between the guide rod 601 and the pressure plate 5 ensures the stability of the force direction. A certain preload force can be generated on the wedge-shaped core block 3 through the preload block 602.
[0044] One end of the guide rod 601 away from the preload block 602 is fixedly connected to a limiting head 603. The limiting head 603 abuts against the outer surface of the pressure plate 5. A pressure adjusting plate 604 is provided on one side of the bottom of the pressure plate 5. A compression spring 605 is connected between the pressure adjusting plate 604 and the limiting head 603. Multiple sets of compression springs 605 are provided and arranged at equal intervals. The guide rod 601 passes through both sides of the pressure adjusting plate 604. When the pressure adjusting plate 604 is pushed against the pressure plate 5, the multiple sets of compression springs 605 are... The compression generates a reaction force that acts on the wedge-shaped core block 3 through the guide rod 601 and the pre-tightening block 602. The limiting head 603 ensures the force transmission path. Multiple sets of compression springs 605 connected in parallel provide a uniform and considerable elastic pre-tightening force. The elastic characteristics of the compression springs 605 enable the wedge-shaped core block 3 to have the ability to follow elastically. When the insulation layer experiences cold flow, the expansion of the compression springs 605 can push the wedge-shaped core block 3 to follow slightly, automatically compensating for gaps and maintaining stable clamping force.
[0045] A threaded cylinder 606 is connected to the inner wall of the middle section of the pressure plate 5 via a bearing. A threaded push rod 607 is threadedly connected to the inner wall of one end of the threaded cylinder 606. The end of the threaded push rod 607 away from the threaded cylinder 606 is fixedly connected to the pressure regulating plate 604. An adjustment knob 608 is fixedly connected to the end of the threaded cylinder 606 away from the pressure regulating plate 604 through the pressure plate 5. By rotating the adjustment knob 608, the threaded cylinder 606 is rotated, and the threaded push rod 607 is axially displaced through the threaded transmission. This precisely pushes the pressure regulating plate 604 to move, changing the compression of the compression spring 605. This achieves stepless and precise adjustment of the axial preload. Installers can accurately set the optimal preload according to actual working conditions such as wire type and ambient temperature, ensuring the consistency and optimization of product performance and avoiding problems caused by under-tightening or over-tightening.
[0046] The inner wall of the composite protective bushing 4 is integrated with an optical fiber sensor 8, which extends along the axial direction of the composite protective bushing 4. A signal transmission module 801 is provided on one side of the clamp body 1. When the composite protective bushing 4 undergoes a slight deformation due to changes in clamping force, the optical transmission characteristics of the optical fiber sensor 8 integrated in its inner wall, such as wavelength and intensity, will change accordingly. This signal is collected and transmitted by the signal transmission module 801, realizing real-time online monitoring of the clamping force. This makes the long-term hidden process of preventing cold flow quantifiable and monitorable, providing key data support for predictive maintenance and smart grid management, and greatly improving the level of line safety management.
[0047] The clamp body 1 and the pressure plate 5 are fixedly connected by fastening bolts 9. An anti-loosening structure 10 is provided between the pressure plate 5 and the clamp body 1. The anti-loosening structure 10 includes a wedge-shaped anti-loosening washer 11 and a pre-tightening spring 12. The wedge-shaped anti-loosening washer 11 is sleeved on the outer wall of the fastening bolt 9, and the surface of the wedge-shaped anti-loosening washer 11 is a wedge-shaped inclined surface. A pre-tightening spring 12 is provided between the wedge-shaped anti-loosening washer 11 and the pressure plate 5. When tightening the nut, the inclined surface of the wedge-shaped anti-loosening washer 11 and the contact surface produce a biting effect. At the same time, the pre-tightening spring 12 provides a continuous axial tension. The combined effect keeps the threaded pair in a tensile state, effectively resisting bolt loosening caused by line vibration, and ensuring the long-term reliability of the connection between the clamp body 1 and the pressure plate 5.
[0048] A guide structure 13 is provided at the entrance of the clamping groove 2 of the main body 1 of the wire clamp. The guide structure 13 is flared, with its larger end facing the direction of wire entry and its smaller end smoothly connected to the clamping groove 2. The inner surface of the guide structure 13 is smoothly transitioned. When installing the wire, the flared guide structure 13 can naturally guide the end of the wire to slide smoothly and accurately into the clamping groove 2, avoiding collision with the groove opening, protecting the wire insulation layer from being scratched during installation, simplifying the difficulty of high-altitude operations, and improving installation efficiency and quality. It is a practical innovation that focuses on user experience and operational safety.
[0049] The surface of the guide rod 601 is provided with a pre-tightening scale line 14. During installation or inspection, by observing the position of the pressure regulating plate 604 relative to the pre-tightening scale line 14 on the guide rod 601, the compression amount of the compression spring 605 can be judged intuitively and quickly, thereby knowing the approximate range of the pre-tightening force.
[0050] The implementation principle of this application embodiment is as follows: First, the wire is smoothly introduced into the clamp groove 2 through the guide structure 13 at the entrance of the clamp body 1. At this time, the wire does not directly contact the metal groove, but is wrapped by the composite protective bushing 4. The inner layer 41 of the bushing is soft and the outer layer 42 is tough, which lays the foundation for subsequent pressure management. When the wire is pulled, its tension drives the wedge-shaped core block 3 to slide into the narrow area of the clamp groove 2 along the wedge-shaped inclined surface. During this process, the operator drives the screw cylinder 606 and the screw push rod 607 to drive the screw cylinder 606 and the screw push rod 607 by rotating the adjustment knob 608. The adjusting mechanism pushes the pressure regulating plate 604 to compress multiple sets of clamping springs 605. The spring force is ultimately converted into a precise and controllable initial axial preload on the wedge-shaped core block 3 through the guide rod 601 and the preload block 602. This force is converted into radial pressure through the wedge-shaped core block 3 and acts on the composite protective bushing 4. The outer layer 42 of the bushing first bears the pressure and disperses the stress, and the inner layer 41 then evenly wraps the conductor insulation layer in a buffering manner. The ridges 43 and friction strips 7 on its inner wall further optimize the contact, limit excessive compression, and increase anti-slip friction. After the clamp enters long-term operation, its anti-slip friction is enhanced. The cold flow function begins to operate continuously. When the conductor insulation layer undergoes slow cold flow deformation under long-term pressure, the original clamping force tends to decrease. At this time, the compressed clamping spring 605 releases its elastic potential energy, pushing the entire axial buffer preload assembly 6 to move slightly, causing the wedge-shaped core block 3 to produce a following displacement, automatically compensating for the gap caused by the cold flow, thereby dynamically maintaining a stable clamping force on the conductor and avoiding irreversible relaxation of pressure under rigid structures. When the composite protective bushing 4 undergoes slight deformation due to changes in clamping force, the optical fiber sensor 8 integrated on its inner wall... Transmission characteristics such as wavelength and intensity will change accordingly. This signal is collected and transmitted by the signal transmission module 801, realizing real-time online monitoring of the clamping force of the line clamp. This makes the long-term hidden process of preventing cold flow quantifiable and monitorable, providing key data support for predictive maintenance and smart grid management, and greatly improving the level of line safety management. During installation or inspection, by observing the position of the voltage regulating plate 604 relative to the pre-tightening scale line 14 on the guide rod 601, the compression amount of the clamping spring 605 can be judged intuitively and quickly, thereby knowing the approximate range of the pre-tightening force.
[0051] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors, comprising a clamp body (1), characterized in that: The upper surface of the clamp body (1) is provided with a clamping groove (2), the top of the clamping groove (2) is provided with a wedge-shaped core block (3), the inner wall of the clamping groove (2) is provided with a composite protective bushing (4), the composite protective bushing (4) is located between the clamp body (1) and the wedge-shaped core block (3), a pressure plate (5) is fixedly connected to one side of the end of the clamp body (1), an axial buffer pre-tightening assembly (6) is provided between the pressure plate (5) and the wedge-shaped core block (3), the composite protective bushing (4) is an integrated wedge structure, the outer wall of the composite protective bushing (4) matches the clamping groove (2), the composite protective bushing (4) includes an inner layer (41) and an outer layer (42), the outer wall of the inner layer (41) is fitted with the outer layer (42).
2. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 1, characterized in that: The inner layer (41) is a soft and elastic insulating material layer, and the outer layer (42) is a cold-flow resistant and high-modulus insulating layer, which is made of thermoplastic material filled with glass fiber.
3. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 2, characterized in that: The inner surface of the inner layer (41) of the composite protective bushing (4) is provided with raised texture (43) extending along its axial direction, and the surface of the raised texture (43) is provided with friction strips (7), and multiple sets of friction strips (7) are provided.
4. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 1, characterized in that: The axial buffer preload assembly (6) includes a guide rod (601), a preload block (602), a limit head (603), a pressure adjusting plate (604), a compression spring (605), a threaded cylinder (606), a threaded push rod (607), and an adjusting knob (608). The guide rod (601) is connected through both ends of the pressure plate (5), and the guide rod (601) is slidably connected to the pressure plate (5). The preload block (602) is fixedly connected to one end of the guide rod (601) near the wedge-shaped core block (3), and the outer surface of the preload block (602) abuts against the wedge-shaped core block (3).
5. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 4, characterized in that: The guide rod (601) is fixedly connected to a limiting head (603) at one end away from the pre-tightening block (602). The limiting head (603) abuts against the outer surface of the pressure plate (5). An adjusting plate (604) is provided on one side of the bottom of the pressure plate (5). A compression spring (605) is connected between the adjusting plate (604) and the limiting head (603). Multiple sets of compression springs (605) are provided and arranged at equal intervals. The guide rod (601) passes through both sides of the adjusting plate (604).
6. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 5, characterized in that: The inner wall of the middle part of the pressure plate (5) is connected to a threaded cylinder (606) via a bearing. A threaded push rod (607) is threadedly connected to the inner wall of one end of the threaded cylinder (606). The end of the threaded push rod (607) away from the threaded cylinder (606) is fixedly connected to the pressure regulating plate (604). The end of the threaded cylinder (606) away from the pressure regulating plate (604) passes through the pressure plate (5) and is fixedly connected to an adjusting knob (608).
7. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 3, characterized in that: The inner wall of the composite protective bushing (4) is integrated with an optical fiber sensor (8), which extends axially along the composite protective bushing (4). A signal transmission module (801) is provided on one side of the clamp body (1).
8. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 7, characterized in that: The clamp body (1) and the pressure plate (5) are fixedly connected by fastening bolts (9). An anti-loosening structure (10) is provided between the pressure plate (5) and the clamp body (1). The anti-loosening structure (10) includes a wedge-shaped anti-loosening washer (11) and a pre-tightening spring (12). The wedge-shaped anti-loosening washer (11) is sleeved on the outer wall of the fastening bolt (9), and the surface of the wedge-shaped anti-loosening washer (11) is a wedge-shaped inclined surface. A pre-tightening spring (12) is provided between the wedge-shaped anti-loosening washer (11) and the pressure plate (5).
9. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 8, characterized in that: The clamp body (1) has a guide structure (13) at the entrance of the clamp groove (2). The guide structure (13) is flared, with its large end facing the direction of the wire entering and its small end smoothly connected to the clamp groove (2). The inner surface of the guide structure (13) is smoothly transitioned.
10. A cold-resistant wedge-shaped tension clamp for overhead insulated conductors according to claim 5, characterized in that: The surface of the guide rod (601) is provided with pre-tightening scale lines (14).