A hinged damping spacer with knurled limit pin

Abstract

This utility model discloses a hinged damping spacer with a knurled limiting pin, belonging to the technical field of spacer bars. The spacer includes a frame and multiple sets of clamp assemblies hinged to the outer ends of the frame. Each clamp assembly includes a clamp body, a hinge pin, a clamp rubber pad, a clamp cap, and a pin shaft. The clamp body and clamp cap are hinged on one side via the hinge pin to form an opening and closing structure. When they are closed, they enclose a clamping cavity for holding the conductor, with the clamp rubber pad lining the inner wall of the cavity. The pin shaft is a knurled limiting pin with knurled teeth, passing through the corresponding pin hole on the opening and closing side of the clamp. The knurled teeth and the inner wall of the pin hole are press-fitted together to form a mechanically engaged anti-detachment structure. The frame adopts a double-plate structure with a large curvature arc transition formed by solid die forging. The tail of the clamp is connected to the frame via a cross-axis peg-type damping joint. This utility model improves the reliability of the locking node and the structural fatigue strength, exhibits excellent electrical and environmental adaptability, and is suitable for ultra-high voltage split transmission lines.

Description

Technical Field

[0001] This utility model relates to the field of spacer technology, and more specifically, to a hinged damping spacer with a knurled limiting pin. Background Technology

[0002] With the large-scale construction of ultra-high voltage (UHV) AC / DC transmission projects in my country, split conductors have become the standard structural form for high-voltage and UHV transmission lines. Spacers, as key hardware components of split conductors, play a crucial role in maintaining the designed spacing between the sub-conductors, suppressing aerobatic vibrations and secondary span oscillations, and resisting load impacts from short-circuit electromagnetic forces, icing, and de-icing conditions. They directly affect the operational safety and service life of the transmission line. Among them, articulated damping spacers, with their excellent buffering and vibration reduction capabilities, are widely used in UHV lines.

[0003] Existing hinged damping spacer clamps generally use pin-type retainers to lock the cover plate to the body. These retainers are mostly smooth cylindrical structures, relying on the frictional force of the interference fit with the pin hole for positioning. In actual operation, the spacer is subjected to alternating loads from conductor aerobatic vibrations, secondary span oscillations, and instantaneous electromagnetic impact forces during short-circuit faults. The smooth-surfaced retainers are prone to axial loosening, circumferential rotation, and even dislodging from the pin hole, leading to loosening of the clamp cover plate, a significant decrease in conductor gripping force, and problems such as conductor slippage and wear, seriously threatening the stability of line operation. Some existing solutions use additional parts such as snap rings and closed pins to prevent the retainers from dislodging, which alleviates the risk of dislodging to some extent, but increases the number of parts and assembly steps. Moreover, the auxiliary parts themselves are also susceptible to vibration failure, and long-term operational reliability remains insufficient.

[0004] Existing spacer bars still have several performance shortcomings. Regarding the fixing method of the rubber pads in the clamps, most adopt a passive containment structure with recessed embedding. After the rubber components undergo aging and creep under long-term high temperature and alternating loads, the mating clearance gradually increases, making it easy for the rubber pads to shift or fall off. This fails to continuously and stably compensate for conductor creep and relaxation, leading to a gradual decrease in clamping force and a decline in damping and vibration reduction performance. In terms of the frame structure, traditional spacer bar frames are mostly formed using casting processes. Due to the limitations of liquid forming technology, the frames are mostly regular polygonal structures with straight edges and corners, resulting in significant stress concentration at the corners. Furthermore, the castings are prone to inherent defects such as sand holes, porosity, and air bubbles, limiting overall fatigue strength and impact resistance, making it difficult to meet the long-life operation requirements under extremely harsh conditions such as ultra-high voltage and heavy icing areas. In addition, some products have sharp edges at the transition between the clamp head and the frame, resulting in significant surface electric field concentration, and the corona and radio interference indicators fail to meet the electrical performance requirements of ultra-high voltage levels.

[0005] In summary, existing articulated damping spacers have shortcomings in terms of reliability against disconnection at key connection nodes, structural fatigue life, and long-term stability of damping performance, and cannot fully meet the current development requirements of high reliability, maintenance-free operation, and long service life for UHV transmission lines. Therefore, we propose an articulated damping spacer with knurled limit pins. Utility Model Content

[0006] The purpose of this invention is to provide a hinged damping spacer with a knurled limiting pin to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A hinged damping spacer with knurled limiting pins includes a frame and multiple sets of wire clamp assemblies hinged to the outer ends of the frame. Each set of wire clamp assemblies includes a wire clamp body, a hinge pin, a wire clamp rubber pad, a wire clamp cap, and a pin shaft. One side of the clamp body and one side of the clamp cover are hinged by a hinge pin to form a clamping structure that can be opened and closed; after the clamp body and the clamp cover are closed, they form a clamping cavity for clamping the wire, and the clamp rubber pad is lined on the inner wall of the clamping cavity. The pin is a knurled limiting pin, which is inserted into the corresponding pin hole on the opening and closing side of the wire clamp body and the wire clamp cover. The outer circumferential surface of the pin is provided with knurled teeth. The pin is press-fitted with the inner wall of the pin hole through the knurled teeth to form a mechanical interlocking anti-loosening locking structure.

[0008] Preferably, the tail of the clamp body is connected to the frame via a damping hinge joint; the damping hinge joint includes a cross shaft and multiple cylindrical rubber pillars, which are sandwiched between the hinge mating surfaces of the clamp body tail and the frame; the inner side of the frame is provided with limiting protrusions on both sides of the end of the clamp assembly, and when the clamp assembly rotates, its end can abut against the limiting protrusions, so that the clamp assembly has a ±15° movement angle relative to the frame in the tangential direction of the conductor splitting circle and a ±5° movement angle in the axial direction of the conductor.

[0009] Preferably, the clamping cavity inner wall of the clamp body and the clamp cover is provided with a boss structure, and the corresponding position of the clamp rubber pad is provided with a matching groove. The boss is embedded in the groove to form a tenon-and-mortise type limiting fit structure.

[0010] Preferably, the frame is a regular polygonal double-frame structure, and the edges and corners of the frame are smoothly transitioned by large-curvature arcs, forming a streamlined outer contour without sharp edges.

[0011] Preferably, the frame is a six-split regular hexagonal frame or an eight-split regular octagonal frame, and the frame body has reserved mounting holes for anti-fighting devices.

[0012] Preferably, the frame is integrally formed by solid forging of 6082 aluminum alloy, and the internal metal flow lines and the outer contour shape of the frame are continuous and consistent.

[0013] Preferably, the tail of the clamp body is connected to the frame by a riveting bolt, and the riveting bolt is equipped with a nut, a flat washer and a spring washer to form an anti-loosening fastening structure.

[0014] Preferably, the end of the hinge pin is equipped with a closed pin, and both the pin shaft and the hinge pin are made of 06Cr19Ni10 stainless steel.

[0015] Preferably, the outer contour of the clamp assembly is a smooth transition structure with a large arc, and the surface is free of sharp edges and burrs.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) This utility model uses a knurled limiting pin as the locking part of the wire clamp. The knurled teeth are embedded in the pin hole base to form a mechanical interlocking fixation. Compared with the interference friction fixation of the traditional smooth pin shaft, it greatly improves the shear resistance and friction coefficient of the mating surface. It can effectively resist alternating loads such as wind vibration, secondary span oscillation and short-circuit electromagnetic shock, and completely avoid the problems of axial movement, circumferential rotation or even disengagement failure of the pin shaft. There is no need to add additional anti-disengagement parts such as snap rings and retaining rings. While simplifying the assembly process, it ensures the long-term stability of the wire clamp gripping force and greatly reduces the frequency of line maintenance. The hinged opening and closing wire clamp structure is easy to install and disassemble. The wire clamping can be completed without disassembling the whole component, and the on-site construction and maintenance efficiency is high.

[0017] (2) The frame is made of solid die forging of 6082 aluminum alloy in one piece, with a smooth transition design of large curvature arc of the whole contour. This not only eliminates internal defects such as sand holes and porosity that are easy to be generated in the casting process, but also makes the metal flow line continuous and dense, and the tensile strength of the material is improved compared with the casting. Furthermore, by eliminating stress concentration points of straight edges and right angles, the stress distribution under load is more uniform, which significantly improves the impact resistance and fatigue resistance of the frame. It can be stably adapted to high and harsh operating scenarios such as ultra-high voltage and heavy ice areas, and extends the overall service life of the product.

[0018] (3) The rubber pad of the clamp adopts a tenon-and-mortise interlocking limiting structure, which eliminates the risk of displacement and detachment of the rubber pad after aging and creep, ensuring the long-term stability of the rubber compression rate, continuously compensating for conductor creep relaxation, and maintaining uniform and reliable conductor gripping force; combined with the cross-axis column-type damping hinge joint, it can efficiently absorb conductor vibration energy, ensure that the system logarithmic attenuation rate meets the standard, and at the same time, the clamp has multi-degree-of-freedom flexible swing capability, which can adapt to conductor deflection, avoid conductor damage by rigid bending, and reduce the risk of conductor fatigue wear in all aspects. The clamp head and frame adopt a large arc smooth transition shape without sharp edges, effectively suppressing the concentration of surface electric field, reducing the level of corona discharge and radio interference, and can directly meet the electrical performance requirements of ±800kV and 1000kV UHV lines; the pin-type fasteners are made of stainless steel, and the rubber components have wide temperature range damping performance and weather resistance, which can adapt to a variety of complex outdoor environments such as high temperature and high humidity, salt spray corrosion, and low temperature and cold, and have strong operational stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the hinged damping spacer with knurled limiting pin of this utility model. Figure 2 This is a schematic diagram of the wire clamp body structure of this utility model; Figure 3 For the present utility model Figure 2 Enlarged view at point A; Figure 4 For the present utility model Figure 3 Cross-sectional view at point B; Figure 5 For the present utility model Figure 2 Cross-sectional view at point C; Figure 6 For the present utility model Figure 2 Cross-sectional view at point D; Figure 7 This is a front view schematic diagram of the wire clamp body of this utility model; Figure 8 This is a top view of the wire clamp body of this utility model; Figure 9 This is a schematic diagram of the pin shaft of this utility model.

[0020] The following are the labels in the diagram: 1. Frame; 101. Anti-flicker device mounting hole; 102. Limiting protrusion; 2. Cable clamp body; 3. Hinge pin; 4. Cable clamp rubber pad; 5. Cable clamp cover; 6. Pin; 601. Knurled tooth pattern; 7. Closed pin; 8. Rivet bolt; 9. Nut; 10. Flat washer; 11. Spring washer; 12. Rubber post; 13. Cross shaft. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example: Please see Figures 1-9 A hinged damping spacer with knurled limiting pins includes a frame 1 and multiple sets of wire clamp assemblies hinged to the outer ends of the frame 1. Each set of wire clamp assemblies includes a wire clamp body 2, a hinge pin 3, a wire clamp rubber pad 4, a wire clamp cover 5, and a pin shaft 6. One side of the clamp body 2 is hinged to one side of the clamp cover 5 by a hinge pin 3, and the other side is locked by a knurled limiting pin, forming an openable clamping structure. The installation and disassembly operations are convenient, and the wire clamping can be completed without disassembling the whole assembly. After the clamp body 2 and the clamp cover 5 are aligned, they form a clamping cavity for clamping the wire. The clamp rubber pad 4 is lined on the inner wall of the clamping cavity. The opening and closing structure, together with the clamp rubber pad 4 in the clamping cavity, can adapt to the outer diameter tolerance of the wire. It provides stable gripping force through rubber compression deformation, while compensating for the creep relaxation caused by long-term operation of the wire, and maintaining a continuous and reliable clamping effect.

[0023] The pin 6 is a knurled limiting pin, which passes through the corresponding pin holes on the opening and closing sides of the clamp body 2 and the clamp cover 5. The outer circumferential surface of the pin 6 is provided with knurled teeth 601. The pin 6 is press-fitted with the inner wall of the pin hole through the knurled teeth 601 to form a mechanical interlocking anti-loosening locking structure. The knurled teeth 601 can be embedded in the base material of the inner wall of the pin hole, which transforms the surface contact friction fixation of the traditional smooth pin into multi-point mechanical interlocking fixation, significantly increasing the friction coefficient and shear strength of the mating surface. It can effectively resist the alternating loads such as conductor vibration, secondary span oscillation and short-circuit electromagnetic shock, and prevent the pin 6 from axial movement, circumferential rotation or even disengagement failure from the structural root. There is no need to add additional anti-loosening parts such as snap rings and retaining rings. While simplifying the assembly process, it greatly improves the long-term operational reliability of the clamping node and ensures the long-term stability of the conductor gripping force.

[0024] In this application, the tail of the clamp body 2 is connected to the frame 1 via a damping hinge joint; the damping hinge joint includes a cross shaft 13 and multiple cylindrical rubber pillars 12. The rubber pillars 12 are clamped between the hinge mating surfaces of the clamp body 2 and the frame 1. The elastic deformation of the rubber pillars 12 under compression can effectively absorb the energy of the conductor's micro-wind vibration and secondary span oscillation, ensuring that the logarithmic attenuation rate of the split conductor-spacer system meets industry standard requirements; the inner side of the frame is provided with limit protrusions 102 on both sides of the end of the clamp assembly, and the clamp assembly... When the component rotates, its end can abut against the limiting protrusion 102. The limiting protrusion 102 restricts the rotation angle of the clamp assembly, so that the clamp assembly has a ±15° movement angle in the tangential direction of the conductor split circle and a ±5° movement angle in the axial direction of the conductor relative to the frame 1. The clamp can flexibly swing ±15° in the tangential direction of the conductor split circle and ±5° in the axial direction of the conductor, and can adaptively deflect with the conductor to adapt to the torsional displacement when the conductor is iced or de-iced, avoid fatigue damage caused by rigid bending of the conductor, and improve the service life of the line.

[0025] In this application, the clamping cavity inner wall of the clamp body 2 and the clamp cover 5 is provided with a boss structure, and the corresponding position of the clamp rubber pad 4 is provided with a matching groove. The boss is embedded in the groove to form a tenon-and-mortise type limiting fit structure, which upgrades the traditional groove-embedded "passive containment" fixing method to an "active embedding" positioning structure. This can effectively prevent the rubber pad from axially shifting and falling off after long-term alternating load and aging creep, ensure the effective compression rate of the clamp rubber pad 4 is stable for a long time, continuously compensate for wire creep relaxation, and make the clamp always maintain a uniform and stable gripping force. At the same time, it avoids direct contact between the wire and the metal clamp, reducing the risk of wire wear.

[0026] In this application, frame 1 is a regular polygonal double-frame structure. The edges and corners of frame 1 are all smoothly transitioned with large-curvature arcs, forming a streamlined outer contour without sharp edges. The smooth transition of the edges and corners of frame 1 with large-curvature arcs is adapted to the metal flow law of the die forging process, reducing defects such as forming folds and insufficient filling. On the other hand, it eliminates the stress concentration problem caused by straight edges and right angles, making the stress distribution of frame 1 more uniform when under load. It can stably withstand complex working conditions such as short-circuit electromagnetic force and icing load, and is adapted to the high reliability operation requirements of ultra-high voltage and heavy icing areas. The double-plate structure further improves the overall torsional and bending stiffness of the frame, ensuring the long-term stability of the spacing of multi-split conductors.

[0027] Frame 1 is integrally formed by solid forging of 6082 aluminum alloy. The internal metal flow lines and the outer contour shape of Frame 1 are continuous and consistent. The double-plate regular polygonal frame integrally formed by solid forging of 6082 aluminum alloy has continuous and dense metal flow lines along the outer contour, which eliminates internal defects such as sand holes and porosity that are easily generated in the casting process. The tensile strength and fatigue resistance of the material are improved compared with the casting.

[0028] In this application, frame 1 is a six-split regular hexagonal frame or an eight-split regular octagonal frame. The frame body of frame 1 has reserved anti-fighting device mounting holes 101. The reserved anti-fighting device mounting holes 101 symmetrically arranged in the middle of frame 1 can quickly install anti-fighting devices such as anti-fighting counterweights and detuned pendulums without changing the main structure of the spacer or affecting the original damping and clamping functions. It also reserves standardized interfaces for subsequent anti-fighting upgrades of the line, improving the product's scenario adaptability and versatility. The symmetrical arrangement of the two holes can ensure that the overall force is balanced after the anti-fighting device is installed, without destroying the original dynamic balance of the spacer and avoiding the introduction of additional vibration risks.

[0029] In this application, the tail of the clamp body 2 is connected to the frame 1 by a riveting bolt 8. The riveting bolt 8 is equipped with a nut 9, a flat washer 10 and a spring washer 11 to form an anti-loosening fastening structure. The riveting structure can restrict the circumferential rotation of the riveting bolt 8. Combined with the elastic anti-loosening effect of the spring washer 11, it can effectively resist the loosening of the threads under long-term alternating vibration, ensure the connection rigidity and structural stability of the hinge node, and reduce the frequency of line operation and maintenance. The flat washer 10 can disperse the clamping force, avoid crushing damage to the surface of the frame 1, and improve the connection durability.

[0030] In this application, the end of the hinge pin 3 is equipped with a closed pin 7. The closed pin at the end of the hinge pin forms an axial anti-disengagement redundancy protection, further avoiding the risk of the pin coming out and improving the operational safety of the hinge structure. Both the pin 6 and the hinge pin 3 are made of 06Cr19Ni10 stainless steel, which has excellent rust resistance and environmental corrosion resistance, and can adapt to complex operating environments such as outdoor high temperature and humidity, coastal salt spray, and industrial corrosion, thus extending the service life of the fittings.

[0031] In this application, the outer contour of the clamp assembly is a smooth transition structure with a large arc, and the surface is free of sharp edges and burrs. This can effectively reduce the concentration of electric field on the surface of the fitting, suppress corona discharge, reduce the level of radio interference, and enable the product's electrical performance to meet the corona and electromagnetic compatibility requirements of ±800kV and 1000kV UHV transmission lines, thus avoiding energy loss and noise interference caused by corona discharge.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hinged damping spacer with knurled limiting pins, comprising a frame (1) and multiple sets of clamp assemblies hinged to the outer ends of the frame (1), characterized in that: Each of the wire clamp assemblies includes a wire clamp body (2), a hinge pin (3), a wire clamp rubber pad (4), a wire clamp cover (5), and a pin shaft (6). One side of the clamp body (2) and one side of the clamp cover (5) are hinged by the hinge pin (3) to form a clamping structure that can be opened and closed; after the clamp body (2) and the clamp cover (5) are aligned, they form a clamping cavity for clamping the wire, and the clamp rubber pad (4) is lined on the inner wall of the clamping cavity. The pin (6) is a knurled limiting pin, which is inserted into the corresponding pin hole on the opening and closing side of the clamp body (2) and the clamp cover (5). The outer circumferential surface of the pin (6) is provided with knurled teeth (601). The pin (6) is press-fitted with the inner wall of the pin hole through the knurled teeth (601) to form a mechanical interlocking anti-loosening locking structure.

2. The hinged damping spacer with knurled limiting pin according to claim 1, characterized in that: The tail of the clamp body (2) is connected to the frame (1) through a damping hinge joint; the damping hinge joint includes a cross shaft (13) and multiple columnar rubber columns (12), and the rubber columns (12) are clamped between the hinge mating surfaces of the tail of the clamp body (2) and the frame (1). The inner side of the frame (1) is provided with limiting protrusions (102) on both sides of the end of the wire clamp assembly. When the wire clamp assembly rotates, its end can abut against the limiting protrusions (102).

3. The hinged damping spacer with knurled limiting pin according to claim 1, characterized in that: The clamp body (2) and the clamp cover (5) have a boss structure on the inner wall of their clamping cavities. The clamp rubber pad (4) has a matching groove at the corresponding position. The boss is embedded in the groove to form a tenon-and-mortise type limiting fit structure.

4. The hinged damping spacer with knurled limiting pin according to claim 1, characterized in that: The frame (1) is a regular polygonal double frame structure. The edge segments and corner connection parts of the frame (1) are all smoothly transitioned by large curvature arcs, forming a streamlined outer contour without sharp edges.

5. A hinged damping spacer with a knurled limiting pin according to claim 4, characterized in that: The frame (1) is a hexagonal frame or an octagonal frame, and the frame (1) has a pre-drilled hole (101) for installing the anti-fighting device.

6. A hinged damping spacer with a knurled limiting pin according to claim 4, characterized in that: The frame (1) is integrally formed by solid die forging of 6082 aluminum alloy, and the internal metal flow lines and the outer contour shape of the frame (1) are continuous and consistent.

7. A hinged damping spacer with a knurled limiting pin according to claim 1, characterized in that: The tail of the clamp body (2) is connected to the frame (1) by a riveting bolt (8). The riveting bolt (8) is equipped with a nut (9), a flat washer (10) and a spring washer (11) to form an anti-loosening fastening structure.

8. A hinged damping spacer with a knurled limiting pin according to claim 1, characterized in that: The end of the hinge pin (3) is equipped with a closed pin (7), and both the pin shaft (6) and the hinge pin (3) are made of 06Cr19Ni10 stainless steel.

9. A hinged damping spacer with a knurled limiting pin according to claim 1, characterized in that: The outer contour of the clamp assembly is a smooth transition structure with a large arc, and the surface has no sharp edges or burrs.

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