Spacer for overhead power lines

Abstract

This invention discloses a spacer bar for overhead transmission lines, relating to the field of power fittings technology. It includes a frame with multiple support arms. Each support arm has a wire clamp at one end and limit pins on both sides of the other end. The frame has waist holes, and the limit pins are inserted into the corresponding waist holes to limit the swing of the support arm. Each support arm consists of an upper arm and a lower arm, with the upper arm rotatably connected to the frame and the limit pins located on the lower arm. The frame has a swing channel for the lower arm to swing. The lower arm has a triggering mechanism and a receiving cavity, containing a spare pin and an elastic element (A). This spacer bar for overhead transmission lines not only automatically restores its limiting capability after the original limiting function is lost, but also restricts the allowable swing angle of the lower arm to a smaller range than the original limiting angle. This provides stricter constraints to suppress conductor galloping, significantly reducing the risk of phase-to-phase flashover and fitting fatigue, and greatly improving the anti-galloping reliability of the spacer bar and the safety of line operation under harsh conditions.

Description

Technical Field

[0001] This invention relates to the field of power fittings technology, specifically to a spacer bar for overhead transmission lines. Background Technology

[0002] Overhead transmission lines typically use spacers to fix the sub-conductors at intervals to maintain the spacing between conductor bundles and suppress wind vibration and galloping. Existing spacers, while constraining the swing range of the support arm to prevent collisions between sub-conductors, allow the arm to rotate within a certain angle to adapt to the dynamic displacement of the conductors, avoiding stress concentration caused by rigid connections. The swing range of the support arm is limited by a locating pin inserted into a slot between the spacer arm and the frame, while simultaneously allowing rotation within a certain angle to accommodate the dynamic displacement of the conductors. However, during long-term operation, spacers are subjected to complex alternating loads such as icing, wind vibration, and short-circuit current impacts. The locating pins are prone to frictional wear, fatigue cracks, and even sudden breakage or dislodgement from the slot, leading to complete failure of the locating fit between the locating pin and the slot. Once the limit switch fails, the outrigger will lose its original swing constraint and swing uncontrollably under the action of conductor galloping. Not only will it fail to effectively suppress galloping, but it may also induce collisions between sub-conductors, phase-to-phase insulation flashover, and even aggravate the impact damage to the hardware and spacer body, seriously threatening the safe operation of the transmission line. Summary of the Invention

[0003] The purpose of this invention is to provide a spacer bar for overhead transmission lines to solve the problem that in the prior art, the spacer bar restricts the swing range of the support arm through the cooperation of the limiting pin and the waist hole. However, after long-term exposure to complex alternating loads such as icing, wind vibration, and short-circuit impact, the limiting cooperation is prone to failure, and the support arm loses its swing constraint and swings uncontrollably and significantly, thereby inducing collisions between sub-conductors, inter-phase flashovers and damage to hardware, which seriously threatens the safe operation of the transmission line.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a spacer bar for overhead transmission lines, comprising a frame, a plurality of support arms on the frame, a wire clamp at one end of the support arm, and limit pins on both sides of the other end, a waist hole on the frame, and the limit pins inserted into the corresponding waist holes to limit the swing of the support arm, the support arm being composed of an upper arm and a lower arm, the upper arm being rotatably connected to the frame, and the limit pins being set on the lower arm.

[0005] The frame is equipped with a swing channel for the lower arm to swing.

[0006] The lower arm is equipped with a triggering mechanism and a receiving cavity. The receiving cavity contains a spare pin and an elastic element A. The elastic element A is used to drive the spare pin to extend. When the triggering mechanism is not triggered, it limits the spare pin and keeps it in the receiving cavity. When triggered, it releases the limit. Each limit pin has a spare pin on each side.

[0007] Two blocking components are provided on the frame and located in the swing channel; after the limiting fit between the limiting pin and the waist hole fails, the blocking component forms a blocking limit on the lower arm; when the lower arm swings and the triggering mechanism abuts against one of the blocking components, the triggering mechanism is triggered to release the limit of all spare pins on the corresponding lower arm. The spare pin on the side closer to the blocked component abuts against the inner wall of the swing channel during the extension process, and the spare pin on the side away from the blocked component extends out and enters the waist hole.

[0008] When the lower arm swings away from the blocked part, the spare pin on the side close to the blocked part releases its contact with the inner wall of the swing channel and moves into the waist hole with the swing of the lower arm.

[0009] Furthermore, the elastic element A is spring A, which is sleeved outside the spare pin. One end of spring A is fixedly connected to the inner wall of the receiving cavity, and the other end of spring A is fixedly connected to the spare pin.

[0010] Furthermore, the triggering mechanism includes a limiting frame and a limiting platform located at the inner end of the spare pin. The limiting frame is located within the receiving cavity. A guide member is connected to one side of the limiting frame to restrict the movement of the limiting frame along the axis perpendicular to the spare pin. A blocking part is provided on the limiting frame. When the spare pin is located within the receiving cavity, elastic element A is in a stretched state. Under the action of the restoring force of elastic element A, the limiting platform abuts against the blocking part. An elastic damping element is provided between the limiting frame and the inner wall of the receiving cavity. The axis of the elastic damping element is perpendicular to the axis of the spare pin. One end of the elastic damping element is fixedly connected to the inner wall of the receiving cavity, and the other end is fixedly connected to the limiting frame.

[0011] A transmission component is connected to one side of the limit frame to drive the limit frame to move so that the blocking part is disengaged from the limit table.

[0012] Furthermore, the transmission component includes an A wedge and two B wedges. The A wedge is fixedly connected to the limiting frame, and the A wedge has inclined surfaces on both sides. The two B wedges are fixedly connected to trigger rods on opposite sides, and the trigger rods extend to the outside of the lower arm. There is a B elastic element between the B wedge and the inner wall of the receiving cavity. When the trigger rod is pressed by the blocking element, the B wedge pushes the A wedge through the inclined surfaces, driving the limiting frame to move and causing the blocking part to disengage from the limiting platform.

[0013] Furthermore, the two blocking components are located on the two end extension lines of the lower arm swing trajectory, and there is a gap between the lower arm and either blocking component when the limiting pin and the waist hole limit are engaged.

[0014] Furthermore, a guide structure is provided within the receiving cavity to restrict the spare pin to move only along its axial direction.

[0015] Furthermore, the outer end of the spare pin is provided with a guide surface, which is used to guide the spare pin into the waist hole.

[0016] Furthermore, the guide is a guide rod, the end of which is fixedly connected to the inner wall of the receiving cavity. The limiting frame has a guide hole for the guide rod to pass through, and the inner wall of the guide hole is slidably connected to the guide rod.

[0017] Furthermore, the lower arm has a mounting hole for inserting the end of the upper arm, and the lower arm and upper arm have corresponding positioning holes, with positioning pins passing through the positioning holes. The positioning pins are used to fix the lower arm and upper arm together.

[0018] Furthermore, a sealing ring is provided at the opening connecting the cavity to the outside and at the end of the spare pin. The sealing ring is used to prevent dust and impurities from entering the cavity.

[0019] Compared with the prior art, the present invention provides a spacer bar for overhead transmission lines, which is divided into an upper arm and a lower arm by a support arm, with a limiting pin located on the lower arm; the lower arm is equipped with a triggering mechanism, a receiving cavity, a spare pin, and an elastic element; two blocking elements are provided at the end of the frame swing channel. After the limiting pin fails to engage with the waist hole, the lower arm swings to abut against the blocking element, the triggering mechanism releases the constraint on the spare pin, the spare pin on the side away from the blocking element enters the waist hole first, and the spare pin on the side closer to the blocking element is delayed in extending due to abutment against the inner wall of the channel. After the lower arm swings in the opposite direction, the spare pin enters the waist hole again, so that the two spare pins successively limit the movement in both directions; this not only realizes that the limiting ability can be automatically restored after the original limiting function is lost, but also limits the allowable swing angle of the lower arm to a smaller range than the original limiting range, thereby suppressing conductor galloping with stricter constraints, significantly reducing the risk of phase-to-phase flashover and hardware fatigue, and greatly improving the anti-galloping reliability of the spacer bar and the safety of line operation under harsh conditions;

[0020] The elastic damping element in the triggering mechanism provides preload to the limit frame, preventing the spare pin from popping out accidentally due to line vibration. At the same time, it absorbs impact energy during triggering, making the unlocking action smooth and reliable. The transmission component adopts a wedge-shaped inclined structure with symmetrical arrangement of double trigger rods, which can independently trigger unlocking regardless of which side the lower arm swings to. Furthermore, the B elastic element suppresses the swaying of the trigger rod through preload, enhancing vibration resistance and reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0023] Figure 2This is a schematic diagram of a first partial three-dimensional structure provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a second partial three-dimensional structure provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the third partial three-dimensional structure provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of a first partial cross-sectional structure provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of a second partial cross-sectional structure provided in an embodiment of the present invention;

[0028] Figure 7 A schematic diagram showing the combination of spring B, limit frame, blocking part, wedge A, wedge B and trigger rod provided in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram showing the combination of the spare pin, the limiting frame, the limiting platform, and the blocking part provided in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Frame; 2. Support arm; 20. Upper arm; 21. Lower arm; 22. Mounting hole; 23. Positioning pin; 3. Cable clamp; 4. Limiting pin; 5. Waist hole; 6. Spare pin; 7. Receiving cavity; 8. Triggering mechanism; 80. Elastic damping component; 81. Limiting frame; 82. Limiting platform; 83. Blocking part; 84. A wedge block; 85. B wedge block; 86. Trigger rod; 9. Blocking component; 10. A spring; 11. B spring. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] like Figures 1 to 5 As shown, the present invention provides a spacer bar for overhead transmission lines, including a frame 1, a plurality of support arms 2 on the frame 1, a wire clamp 3 at one end of the support arm 2, and limiting pins 4 on both sides of the other end. The frame 1 is provided with waist holes 5, and the limiting pins 4 are inserted into the corresponding waist holes 5 to limit the swing of the support arm 2. The support arm 2 is composed of an upper arm 20 and a lower arm 21. The upper arm 20 is rotatably connected to the frame 1, and the limiting pins 4 are provided on the lower arm 21.

[0034] The frame 1 is provided with a swing channel for the lower arm 21 to swing;

[0035] The lower arm 21 is provided with a triggering mechanism 8 and a receiving cavity 7. The receiving cavity 7 is provided with a spare pin 6 and an elastic element A. The elastic element A is used to drive the spare pin 6 to extend. When the triggering mechanism 8 is not triggered, it limits the spare pin 6 to keep it in the receiving cavity 7. When triggered, the limit is released. Each limit pin 4 has a spare pin 6 on each side.

[0036] Two blocking elements 9 are provided on the frame 1 and located in the swing channel; after the limiting engagement between the limiting pin 4 and the waist hole 5 fails, the blocking element 9 forms a blocking limit on the lower arm 21; when the lower arm 21 swings and the triggering mechanism 8 abuts against one of the blocking elements 9, the triggering mechanism 8 is triggered to release the limiting of all spare pins 6 on the corresponding lower arm 21. The spare pin 6 on the side closer to the blocked element 9 abuts against the inner wall of the swing channel during the extension process, and the spare pin 6 on the side away from the blocked element 9 extends out and enters the waist hole 5.

[0037] When the lower arm 21 swings away from the abutting blocking member 9, the spare pin 6 on the side close to the abutting blocking member 9 releases its contact with the inner wall of the swing channel and moves into the waist hole 5 with the swing of the lower arm 21.

[0038] This application divides the support arm 2 into an upper arm 20 rotatably connected to the frame 1 and a lower arm 21 detachably connected. A limiting pin 4 is installed on the lower arm 21. When the limiting pin 4 fails to maintain its position with the waist hole 5 (i.e., the limiting pin 4 loses its position due to wear or breaks), the lower arm 21 swings under the influence of the conductor until it abuts against the blocking member 9 at the end of the swing channel. The triggering mechanism 8 is activated by this contact, releasing the holding limit on all spare pins 6 on the lower arm 21. Driven by the elastic element A, the spare pins 6 on the side away from the blocking member 9 extend directly into the waist hole 5 to form a temporary limit, while those closer to the blocking member 9... The spare pin 6 on one side of the stop 9 is temporarily unable to enter the waist hole 5 because it abuts against the inner wall of the swing channel during its extension. Only after the lower arm 21 swings in the opposite direction and the spare pin 6 disengages from the inner wall of the channel can it continue to move and enter the waist hole 5 under the action of the elastic element. This allows both spare pins 6 to enter the waist hole 5 sequentially, forming a spare limit for both the forward and reverse swing directions of the lower arm 21. Furthermore, the two spare pins 6 are located on both sides of the limit pin 4. After both spare pins 6 are inside the waist hole 5, the swing amplitude of the lower arm 21 can be further limited, meaning the allowable swing angle of the lower arm 21 is limited to a smaller range than when the original limit pin 4 is in control. Therefore, after the original limiting function is lost, the spacer not only restores its limiting ability through the spare pins 6 but also further narrows the swing amplitude of the support arm 2, thereby more strictly restraining wire galloping and reducing the risk of hardware fatigue caused by residual swing.

[0039] like Figure 5 and Figure 6As shown, in one embodiment of the present invention, the elastic element A is a spring 10. The spring 10 is sleeved on the outside of the spare pin 6. One end of the spring 10 is fixedly connected to the inner wall of the receiving cavity 7, and the other end of the spring 10 is fixedly connected to the spare pin 6.

[0040] Specifically, spring A 10 provides the axial driving force for the spare pin 6. When the spare pin 6 is confined within the receiving cavity 7 by the triggering mechanism 8 (i.e., in the retracted position), spring A 10, which is sleeved on the outside of the spare pin 6, is stretched. Once the triggering mechanism 8 releases the confinement of the spare pin 6, spring A 10 extends and rebounds. Its restoring force is directly converted into a driving force that pulls the spare pin 6 outward along the axial direction of the receiving cavity 7 (i.e., the spring contracts and rebounds) by means of a fixed connection at one end to the inner wall of the receiving cavity 7 and a fixed connection at the other end to the spare pin 6. This ensures that the spare pin 6 can reliably and quickly enter the waist hole 5 to achieve the spare confinement.

[0041] To prevent the spare pin 6 from axial reciprocating vibration caused by the rapid release of elastic potential energy during the extension of spring 10, which could lead to unstable movement or even difficulty in accurately entering the waist hole 5, high internal damping spring materials such as silicon manganese spring steel (60Si2CrA) or isothermal quenched spring steel can be used to suppress this vibration. Alternatively, a damping bushing such as polytetrafluoroethylene can be added between the inner wall of the receiving cavity 7 and the spare pin 6. Or, the diameter of the spring wire can be appropriately reduced and the effective number of turns can be increased to reduce the stiffness and natural frequency, ensuring that the spare pin 6 enters the waist hole 5 smoothly and reliably.

[0042] like Figure 2 , Figures 5 to 8 As shown, in one embodiment of the present invention, the triggering mechanism 8 includes a limiting frame 81 and a limiting platform 82 disposed at the inner end of the spare pin 6. The limiting frame 81 is disposed in the receiving cavity 7. A guide member is connected to one side of the limiting frame 81 to restrict the movement of the limiting frame 81 along the axis perpendicular to the spare pin 6. A blocking part 83 is provided on the limiting frame 81. When the spare pin 6 is located in the receiving cavity 7, the elastic member A is in a stretched state. Under the action of the restoring force of the elastic member A, the limiting platform 82 abuts against the blocking part 83. An elastic damping member 80 is provided between the limiting frame 81 and the inner wall of the receiving cavity 7. The axis of the elastic damping member 80 is perpendicular to the axis of the spare pin 6. One end of the elastic damping member 80 is fixedly connected to the inner wall of the receiving cavity 7, and the other end is fixedly connected to the limiting frame 81. A transmission member is connected to one side of the limiting frame 81 for driving the limiting frame 81 to move so that the blocking part 83 disengages from contact with the limiting platform 82.

[0043] Specifically, when the spare pin 6 is confined within the receiving cavity 7 by the triggering mechanism 8 (i.e., in the retracted position), the stretched elastic element A generates a contraction force toward the opening of the receiving cavity 7. This force is transmitted to the limiting table 82 via the spare pin 6, causing the limiting table 82 to press tightly against the blocking part 83 on the limiting frame 81. The limiting frame 81 is restricted by the guide member to move only in a direction perpendicular to the axial direction of the spare pin 6, and cannot move along the axial direction of the spare pin 6. Therefore, the blocking part 83 forms a stable hook limit on the limiting table 82, locking the spare pin 6 in the retracted position (i.e., in the receiving cavity 7). When the limiting pin 4 fails to cooperate with the waist hole 5, and the lower arm 21 swings, causing the transmission member to abut against the blocking member 9, the transmission member drives the limiting frame 81 to move in a direction perpendicular to the axial direction of the spare pin 6, thereby causing the blocking part 83 to disengage from the limiting table 82. After the spare pin 6 is unconstrained, it quickly extends outward under the restoring force of the elastic element A.

[0044] Among them, the elastic damping element 80 provides a stable position holding force for the limit frame 81 when the spacer is working normally, preventing the limit frame 81 from sliding unexpectedly along the guide due to line vibration or external impact, thereby avoiding the blocking part 83 from accidentally disengaging from the limit table 82 and causing the spare pin 6 to pop out unexpectedly; at the same time, when the triggering mechanism 8 is activated, the elastic damping element 80 can absorb the impact energy of the limit frame 81 during the movement process, buffer the impact force of the transmission component, and make the limit frame 81 move smoothly to the unlock position, reducing the risk of rebound or jamming caused by violent collision. When the limit frame 81 is in the untriggered position (i.e., when the spare pin 6 is in the receiving cavity 7), the elastic damping element 80 applies a preload force to the limit frame 81 in the sliding direction and opposite to the driving force of the transmission element, thereby suppressing the free sliding of the limit frame 81; when the transmission element drives the limit frame 81 to move, the elastic damping element 80 generates a damping force opposite to the direction of movement, which can slow down the movement speed of the limit frame 81 and avoid rigid impact caused by rapid movement; the elastic damping element 80 can be a damping spring.

[0045] In this embodiment, in order to ensure that the limiting frame 81 moves smoothly and without deviation, the guide is a guide rod. The end of the guide rod is fixedly connected to the inner wall of the receiving cavity 7. The limiting frame 81 is provided with a guide hole for the guide rod to pass through. The inner wall of the guide hole is slidably connected to the guide rod. The axis of the guide rod is perpendicular to the axial direction of the spare pin 6.

[0046] like Figure 2 , Figures 5 to 8As shown, in one embodiment of the present invention, the transmission component includes an A wedge 84 and two B wedges 85. The A wedge 84 is fixedly connected to the limiting frame 81, and the A wedge 84 has inclined surfaces on both sides. The two B wedges 85 are each fixedly connected to a trigger rod 86 on the side away from each other. The trigger rod 86 extends to the outside of the lower arm 21, and a B elastic element is provided between the B wedges 85 and the inner wall of the receiving cavity 7. When the trigger rod 86 is pressed by the blocking element 9, the B wedges 85 push the A wedge 84 through the inclined surfaces, driving the limiting frame 81 to move, so that the blocking part 83 disengages from the limiting platform 82.

[0047] Specifically, when the limiting engagement between the limiting pin 4 and the waist hole 5 fails, the lower arm 21 swings to the end of the swing channel under the action of the guide wire, and the end of the trigger rod 86 collides and presses against the blocking member 9; after being pressed, the trigger rod 86 pushes the B wedge block 85 to move into the receiving cavity 7, compressing the B elastic member; during the movement, the inclined surface of the B wedge block 85 contacts the inclined surface of the A wedge block 84 and produces relative sliding. Due to the rising angle of the inclined surface, the horizontal thrust of the B wedge block 85 is converted into the translational movement of the A wedge block 84 (and the limiting frame 81 fixed thereto) along the axis perpendicular to the spare pin 6, thereby causing the blocking part 83 to disengage from the limiting platform 82 and release the limiting of the spare pin 6;

[0048] Among them, the B elastic element can be a B spring 11, which is sleeved on the outside of the trigger rod 86, with its two ends abutting against the inner wall of the receiving cavity 7 and the B wedge 85 respectively. The pre-tightening effect of the B spring 11 reduces the shaking of the trigger rod 86 and the B wedge 85, and enhances the vibration resistance reliability of the device in long-term operation.

[0049] A through-hole is provided on the side wall of the lower arm 21. The axis of the through-hole coincides with the axis of the trigger rod 86. The trigger rod 86 passes through the through-hole and through the side wall of the lower arm 21. One end of the trigger rod 86 extends into the receiving cavity 7 and is fixedly connected to the B wedge block 85 (e.g., by thread or riveting). The other end is exposed outside the lower arm 21 to receive the pressure of the blocking member 9. To ensure that the trigger rod 86 can slide flexibly axially without radial deviation, a guide sleeve can be installed in the through-hole. The guide sleeve is preferably made of bronze powder metallurgy bushing or polytetrafluoroethylene (PTFE) composite material bushing. Its inner diameter forms a sliding fit clearance of H7 / f7 or H8 / f8 with the outer diameter of the trigger rod 86, which ensures low frictional resistance and limits the radial swing of the trigger rod 86. The guide sleeve can be pressed into the through-hole with an interference fit and axially fixed by end flanges or retaining rings. To prevent external dust, moisture and salt spray from entering the receiving cavity 7 through the through-hole, a sealing structure is provided at the penetration point between the trigger rod 86 and the lower arm 21. Preferably, a shaft-mounted lip seal is used, and the seal is installed at the end of the guide hole near the outside.

[0050] like Figure 2 and Figure 6As shown, in one embodiment of the present invention, the two blocking members 9 are respectively located on the two end extension lines of the swing trajectory of the lower arm 21, and when the limiting pin 4 and the waist hole 5 are in a limiting engagement, there is a gap between the lower arm 21 and any of the blocking members 9.

[0051] Specifically, when the limiting pin 4 and the waist hole 5 are in normal limiting engagement, the swing range of the lower arm 21 is completely constrained by the engagement of the limiting pin 4 and the waist hole 5. Since there is a gap between the lower arm 21 and any blocking member 9, the normal swing of the lower arm 21 will not touch the blocking member 9, thereby avoiding interference or additional friction of the blocking member 9 on the swing of the support arm 2 under normal working conditions, ensuring that the original anti-swinging performance of the spacer bar is not affected. When the limiting engagement of the limiting pin 4 and the waist hole 5 fails, the lower arm 21 loses its original swing constraint, and its swing amplitude will exceed the normal range until the side of the lower arm 21 or the triggering mechanism 8 abuts against the blocking member 9 located on the extension line at the end of the swing trajectory. At this time, the blocking member 9 provides mechanical stop limit for the lower arm 21 to prevent the lower arm 21 from swinging excessively due to lack of constraint. At the same time, the abutment action triggers the triggering mechanism 8 to release the spare pin 6. By symmetrically arranging the two blocking members 9 on the two end extension lines of the swing trajectory of the lower arm 21, the lower arm 21 can reliably abut against it no matter which side it swings out to, thus realizing independent blocking and triggering of the two swing directions. This ensures that the spacer bar can still effectively limit the swing of the support arm 2 and activate the backup limit mechanism after the limit pin 4 fails.

[0052] The blocking component 9 is a rigid protrusion fixedly installed on the frame 1. It can be integrally formed on the frame 1, or it can be an independent metal or engineering plastic component, fixed to the frame 1 by threaded connection, riveting or welding.

[0053] like Figure 5 As shown, in one embodiment of the present invention, a guide structure is provided in the receiving cavity 7, the guide structure being used to restrict the spare pin 6 to move only along its axial direction;

[0054] Specifically, the guide structure is the connecting opening between the receiving cavity 7 and the outside. The radial dimension of the connecting opening matches the outer diameter of the spare pin 6, and a sliding fit clearance is formed between the two. When the spare pin 6 extends outward along the receiving cavity 7 under the drive of the elastic element A or retracts inward under the action of external force, the inner wall of the connecting opening constrains the radial displacement of the spare pin 6, so that it can only translate along its own axial direction and cannot deflect or move radially.

[0055] like Figure 8 As shown, in one embodiment of the present invention, the outer end of the spare pin 6 is provided with a guide surface, which is used to guide the spare pin 6 into the waist hole 5;

[0056] Specifically, the guide surface is either a rounded corner at the end of the spare pin 6 or an arc-shaped end. The main function of this guide surface is to reduce the friction between the spare pin 6 and the edge of the waist hole 5 when the spare pin 6 enters the waist hole 5. When the spare pin 6 extends outward under the drive of elastic element A, its outer end first contacts the opening edge of the waist hole 5. By using the guide surface to round the corner or create an arc-shaped end, the contact area with the edge of the waist hole 5 is reduced, thereby reducing friction and ensuring that the spare pin 6 can smoothly slide into the waist hole 5 with less resistance.

[0057] like Figure 3 and Figure 4 As shown, in one embodiment of the present invention, the lower arm 21 is provided with a mounting hole 22 for the end of the upper arm 20 to be inserted, and the lower arm 21 and the upper arm 20 are respectively provided with positioning holes, and a positioning pin 23 is provided in the positioning hole. The positioning pin 23 is used to fix the lower arm 21 and the upper arm 20.

[0058] Specifically, the end of the upper arm 20 is inserted into the mounting hole 22 of the lower arm 21 to achieve radial positioning and initial limiting. Then, the relative displacement of the two along the axial direction is constrained by the positioning pin 23 passing through the corresponding positioning holes on the upper arm 20 and the lower arm 21, thereby fixing the upper arm 20 and the lower arm 21 into a whole to form a complete support arm 2. When the limiting pin 4 is damaged and needs to be repaired or replaced, the lower arm 21 can be removed from the upper arm 20 simply by pulling out the positioning pin 23, without having to replace the entire support arm 2, which significantly reduces the operation and maintenance cost and the difficulty of on-site inspection.

[0059] To prevent the locating pin 23 from loosening under long-term vibration, an anti-loosening structure can be provided at the end of the locating pin 23: preferably, a cotter pin is used, that is, a radial through hole is opened at the tail of the locating pin 23, and after assembly, the cotter pin is inserted and the tail is pried open, which can effectively prevent the locating pin 23 from axially exiting; alternatively, an elastic cylindrical pin can be used, which utilizes the interference fit between its outer diameter and the locating hole and its own radial elasticity to achieve anti-loosening without additional parts; or a threaded pin and anti-loosening nut can be used for fixing, with threads machined at the end of the locating pin 23, the anti-loosening nut screwed in and a tightening torque applied to meet the requirements of anti-loosening and quick disassembly.

[0060] like Figure 5 As shown, in one embodiment of the present invention, a sealing ring (not shown in the figure, preferably a shaft lip seal ring) is provided at the opening of the receiving cavity 7 communicating with the outside and at the end of the spare pin 6. The sealing ring is used to prevent dust and impurities from entering the receiving cavity 7.

[0061] Specifically, the sealing ring is used to prevent dust and impurities from entering the receiving cavity 7. The sealing ring can block the path of dust, sand, salt spray and moisture in the outside air into the receiving cavity 7 through the opening gap, and can effectively prevent dust from accumulating on the sliding surface of the spare pin 6 and the inner wall of the receiving cavity 7, preventing the increase of sliding resistance, jamming of the spare pin 6 or unsmooth movement caused by dust accumulation, and ensuring that the spare pin 6 can pop out quickly and reliably after triggering.

[0062] In one embodiment of the invention, to quickly identify whether the limit pin 4 is broken or severely worn during routine inspections, a mechanical indicating structure is provided: a high-brightness red coating is applied to the end surface of the limit pin 4. When the limit pin 4 is in place and properly inserted into the waist hole 5, a red mark can be clearly seen by observing the end of the limit pin 4; if the limit pin 4 is broken, detached, or excessively worn, the red mark disappears or the underlying metal background is exposed. Maintenance personnel can quickly determine the problem using a drone or binoculars, avoiding the need to climb the tower for inspection.

[0063] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A spacer bar for overhead transmission lines, comprising a frame (1), a plurality of arms (2) provided on the frame (1), a clamp (3) provided at one end of each arm (2), and limiting pins (4) provided on both sides of the other end; a waist hole (5) provided on the frame (1), the limiting pins (4) being inserted into the corresponding waist hole (5) to limit the swing of the arm (2), characterized in that, The support arm (2) is composed of an upper arm (20) and a lower arm (21). The upper arm (20) is rotatably connected to the frame (1), and the limiting pin (4) is set on the lower arm (21). The frame (1) is provided with a swing channel for the lower arm (21) to swing; The lower arm (21) is provided with a triggering mechanism (8) and a receiving cavity (7). The receiving cavity (7) is provided with a spare pin (6) and an elastic element A. The elastic element A is used to drive the spare pin (6) to extend. When the triggering mechanism (8) is not triggered, it limits the spare pin (6) to keep it in the receiving cavity (7). When triggered, it releases the limit. Each limiting pin (4) has a spare pin (6) on each side. Two blocking members (9) are provided on the frame (1) and located in the swing channel; after the limiting engagement between the limiting pin (4) and the waist hole (5) fails, the blocking member (9) forms a blocking limit on the lower arm (21); when the lower arm (21) swings and the triggering mechanism (8) abuts against one of the blocking members (9), the triggering mechanism (8) is triggered to release the limiting of all spare pins (6) on the corresponding lower arm (21). The spare pin (6) on the side closer to the blocked member (9) abuts against the inner wall of the swing channel during the extension process, and the spare pin (6) on the side away from the blocked member (9) extends out and enters the waist hole (5); When the lower arm (21) swings away from the blocked part (9), the spare pin (6) on the side close to the blocked part (9) releases its contact with the inner wall of the swing channel and moves into the waist hole (5) with the swing of the lower arm (21).

2. A spacer for overhead transmission lines according to claim 1, characterized in that, The elastic element A uses spring A (10), which is sleeved on the outside of the spare pin (6). One end of spring A (10) is fixedly connected to the inner wall of the receiving cavity (7), and the other end of spring A (10) is fixedly connected to the spare pin (6).

3. A spacer for overhead transmission lines according to claim 1, characterized in that, The triggering mechanism (8) includes a limiting frame (81) and a limiting platform (82) located at the inner end of the spare pin (6). The limiting frame (81) is located in the receiving cavity (7). A guide member is connected to one side of the limiting frame (81) to restrict the movement of the limiting frame (81) along the axis perpendicular to the spare pin (6). A blocking part (83) is provided on the limiting frame (81). When the spare pin (6) is located in the receiving cavity (7), the elastic member A is in a stretched state. Under the action of the restoring force of the elastic member A, the limiting platform (82) abuts against the blocking part (83). An elastic damping member (80) is provided between the limiting frame (81) and the inner wall of the receiving cavity (7). The axis of the elastic damping member (80) is perpendicular to the axis of the spare pin (6). One end of the elastic damping member (80) is fixedly connected to the inner wall of the receiving cavity (7), and the other end is fixedly connected to the limiting frame (81). A transmission component is connected to one side of the limiting frame (81) for driving the limiting frame (81) to move so that the blocking part (83) disengages from contact with the limiting table (82).

4. A spacer for an overhead transmission line according to claim 3, characterized in that, The transmission component includes an A wedge (84) and two B wedges (85). The A wedge (84) is fixedly connected to the limiting frame (81), and the A wedge (84) has inclined surfaces on both sides. The two B wedges (85) are fixedly connected to trigger rods (86) on the opposite sides. The trigger rods (86) extend to the outside of the lower arm (21). There is a B elastic element between the B wedges (85) and the inner wall of the receiving cavity (7). When the trigger rod (86) is pressed by the blocking element (9), the B wedges (85) push the A wedges (84) through the inclined surfaces, driving the limiting frame (81) to move, so that the blocking part (83) is disengaged from the limiting platform (82).

5. A spacer for overhead transmission lines according to claim 1, characterized in that, The two blocking parts (9) are located on the two end extension lines of the swing trajectory of the lower arm (21), and when the limiting pin (4) and the waist hole (5) are in a limiting engagement, there is a gap between the lower arm (21) and any of the blocking parts (9).

6. A spacer for overhead transmission lines according to claim 1, characterized in that, The cavity (7) is provided with a guide structure, which is used to restrict the spare pin (6) to move only along its axial direction.

7. A spacer for an overhead transmission line according to claim 1, characterized in that, The outer end of the spare pin (6) is provided with a guide surface, which is used to guide the spare pin (6) into the waist hole (5).

8. A spacer for an overhead transmission line according to claim 3, characterized in that, The guide is a guide rod, the end of which is fixedly connected to the inner wall of the receiving cavity (7). The limit frame (81) has a guide hole for the guide rod to pass through. The inner wall of the guide hole is slidably connected to the guide rod. The axial direction of the guide rod is perpendicular to the axial direction of the spare pin (6).

9. A spacer for an overhead transmission line according to claim 1, characterized in that, The lower arm (21) has an installation hole (22) for inserting the end of the upper arm (20). The lower arm (21) and the upper arm (20) have corresponding positioning holes. A positioning pin (23) is inserted into the positioning hole. The positioning pin (23) is used to fix the lower arm (21) and the upper arm (20) together.

10. A spacer for an overhead transmission line according to claim 1, characterized in that, A sealing ring is provided at the opening of the receiving cavity (7) that communicates with the outside and at the end of the spare pin (6). The sealing ring is used to prevent dust and impurities from entering the receiving cavity (7).

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