Pulley type tower head clamp and use method thereof

Abstract

The present invention relates to the technical field of tower head clamps, and discloses a pulley-type tower head clamp and a method for using the same, comprising a plurality of iron tower frame bodies, and a plurality of hanging point hardware arranged on the iron tower frame bodies, a high-voltage cable is arranged between two adjacent iron tower frame bodies, a clamp bracket is arranged on the high-voltage cable, and rollers clamped on the high-voltage cable are arranged at both ends of the clamp bracket, a threading frame is arranged on the clamp bracket, and the high-voltage cable passes through the threading frame through a threading hole. In the process of pulling down the combined pull rope, the present invention will slide on the side cavity against the push block, thereby pulling the pull rope and driving the rotating shaft to rotate, and completing the power storage of the mainspring, at this time, the swing bracket on the rotating shaft, under the action of the limit plate, drives the friction wheel to rotate against the arc baffle, and because the friction wheel is against the high-voltage cable, it will carry the clamp bracket to move higher on the high-voltage cable.

Description

Technical Field

[0001] The invention relates to the technical field of tower head clamps, and in particular to a pulley type tower head clamp and a use method thereof. Background Art

[0002] When replacing the linear insulators of a traditional transmission line or an overhead ground wire under power, the use of a single-sided hanging point fixture will cause unbalanced torque on the crossarm. Now that the conductors of the lines are gradually increasing and there are equipment with multiple conductors, the single-sided hanging point fixture can no longer meet the needs of operational safety.

[0003] However, the tower head clamp used in the prior art itself is not stable. Since the pulley hanging point is lower than the required overhead ground wire installation position, the overhead ground wire cannot be lifted to the corresponding position, that is, the operator on the ground cannot move the pulley below the required overhead ground wire installation position to the corresponding high position, which results in the overhead ground wire and insulator carried by the tower head clamp being unable to reach the predetermined position.

[0004] Therefore, we designed a pulley type tower head clamp and a method for using the same. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the overhead ground wire cannot be lifted to the corresponding position because the pulley hanging point is lower than the required overhead ground wire installation position, and to propose a pulley type tower head clamp and a use method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A pulley-type tower head clamp comprises a plurality of iron tower frame bodies and a plurality of hanging point hardware arranged on the iron tower frame bodies, a high-voltage cable is arranged between two adjacent iron tower frame bodies, a clamp bracket is arranged on the high-voltage cable, and rollers clamped on the high-voltage cable are arranged at both ends of the clamp bracket, a threading frame is arranged on the clamp bracket, and the high-voltage cable passes through the threading frame through a rope threading hole, a first pull rope and a second pull rope hanging on both sides of the threading frame are arranged on the threading frame, the other ends of the first pull rope and the second pull rope are twisted into a stranded pull rope, the stranded pull rope passes through the threading frame through an inclined hole, the first pull rope and the second pull rope release the extrusion on the side wall of the high-voltage cable through a rubber block, and a friction wheel is arranged in the threading frame, which is extruded with the outer wall of the high-voltage cable and drives the clamp bracket to move.

[0008] Preferably, a side cavity is provided on the threading rack, a push block is slidably arranged in the side cavity through a slide groove and a slider, a limit baffle is provided on the threading rack for limiting the push block, and a third reset spring is provided in the slide groove for resetting the push block.

[0009] Preferably, two pressing cavities are symmetrically provided on the threading frame, and pressing plates are slidably provided on the two pressing cavities. The first pull rope and the second pull rope are respectively placed on the top of the pressing plates on both sides of the threading frame, and the first pull rope and the second pull rope are twisted at the bottom of the high-voltage cable.

[0010] Preferably, the pressing plate is reset, lifted, and slid in the pressing cavity by a first reset spring, an extension cavity is provided on the side wall of the rope threading hole, and the rubber block slides in the extension cavity, a lower pressing plate extending into the extension cavity is provided at the bottom of the pressing plate, a chamfer is provided at the bottom of the lower pressing plate, and a resist plate is provided in the extension cavity which is retracted and extended in the extension cavity by a fourth reset spring, and the resist plate and the rubber block are connected by an elastic rod arranged obliquely.

[0011] Preferably, the side walls of the threading rack are provided with side frames, a top plate is provided above the side frames, the top plate is provided with holes, and the twisting points of the first pull rope and the second pull rope are fixed in the holes, the twisted pull rope passes through the top plate and the side frames, and passes through the inclined holes, a second return spring is connected between the top plate and the side frames, and the first pull rope and the second pull rope are fixed to the top of the threading rack through the top tie point.

[0012] Preferably, an inner cavity is provided in the threading frame, and the friction wheel rotates in the inner cavity through a wheel bracket. An axial hole is provided at the axis of the friction wheel, and a rotating shaft for driving the friction wheel to rotate unidirectionally is provided in the axial hole.

[0013] Preferably, a pull wire is wound around the rotating shaft, and the other end of the pull wire extends out of the side cavity and is connected to the push block, and one end of the rotating shaft is provided with a spring for resetting the rotating shaft.

[0014] Preferably, the outer wall of the rotating shaft is provided with a plurality of swing brackets which abut against the side wall of the shaft hole, and the swing brackets rotate on the outer wall of the rotating shaft through shaft pins, and the inner wall of the shaft hole is circumferentially provided with an arc-shaped baffle.

[0015] Preferably, a limit plate is fixed to the outer side wall of the rotating shaft, and the limit plate and the arc-shaped baffle are staggered.

[0016] A method for using a pulley type tower head clamp, the specific operation method is as follows:

[0017] S1: The threading frame is a buckle structure. The high-voltage cable is buckled into the threading hole in the threading frame, and then the buckle is fixed on the fixture bracket and hung on the high-voltage cable. The threading frame is clamped with the corresponding overhead ground wire and insulator. Then the operator standing on the ground needs to continuously pull the stranded rope to complete the unidirectional climbing and sliding of the fixture bracket on the high-voltage cable.

[0018] S2: When pulling the combined pull rope, the first pull rope and the second pull rope will first press the two pressing plates on the side wall of the threading frame, and the downward pressure of the two pressing plates will drive the lower pressing plate to slide against the rubber block on the plate toward the extension cavity, that is, the rubber block releases the downward positioning of the high-voltage cable;

[0019] S3: When the combined pull rope is pulled down, it will slide against the push block on the side cavity, thereby pulling the pull rope and driving the rotating shaft to rotate, and completing the power storage of the mainspring. At this time, the swing bracket on the rotating shaft, under the action of the limit plate, drives the friction wheel to rotate against the arc baffle. Since the friction wheel is against the high-voltage cable, it will move the fixture bracket to a higher place on the high-voltage cable;

[0020] S4: After the stranded pull rope is loosened, the rotating shaft rotates in the opposite direction under the action of the mainspring and the first reset spring, but there is no limit plate. At this time, the swing bracket cannot press against the arc baffle, so the reversed rotating shaft does not rotate with the friction wheel; at the same time, the rubber block presses against the high-voltage cable again and completes the downward positioning.

[0021] The beneficial effects of the present invention are:

[0022] During the downward pulling process of the combined pull rope, the present invention will slide on the side cavity against the push block, thereby pulling the pull rope and driving the rotating shaft to rotate, and completing the power storage of the mainspring. At this time, the swing bracket on the rotating shaft, under the action of the limit plate, drives the friction wheel to rotate against the arc baffle. Since the friction wheel resists the high-voltage cable, it will move the clamp bracket to a higher place on the high-voltage cable.

[0023] After the twisted pull rope in the present invention is loosened, the rotating shaft rotates in the opposite direction under the action of the mainspring and the first reset spring, but there is no limit plate, so the swing bracket cannot press against the arc baffle at this time, so the reversed rotating shaft will not rotate with the friction wheel; at the same time, the rubber block presses against the high-voltage cable again and completes the sliding positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a tower proposed by the present invention;

[0025] Figure 2 A schematic diagram of the structure of a pulley-type tower head fixture proposed by the present invention;

[0026] Figure 3 This is a structural schematic diagram of a threading frame in a pulley-type tower head fixture proposed by the present invention;

[0027] Figure 4 It is a left and right isometric view of a threading frame in a pulley-type tower head fixture proposed by the present invention;

[0028] Figure 5A schematic diagram of the opening and closing state of a threading frame in a pulley-type tower head fixture proposed by the present invention;

[0029] Figure 6 It is a main cross-sectional view of the opening and closing state of the threading frame in the pulley type tower head fixture proposed by the present invention;

[0030] Figure 7 A partial exploded view of a threading frame in a pulley-type tower head fixture proposed by the present invention;

[0031] Figure 8 A schematic diagram of the state of cooperation between the lower pressing plate and the abutting plate in a pulley-type tower head fixture proposed by the present invention;

[0032] Fig. 9 A schematic diagram of the clamping state of a high-voltage cable in a pulley-type tower head fixture proposed by the present invention;

[0033] Fig.10 This is a schematic structural diagram of a friction wheel in a pulley-type tower head fixture proposed by the present invention;

[0034] Fig.11 for Fig.10 A schematic diagram of the structure enlargement at the center A;

[0035] Fig.12 It is a left and right isometric view of a friction wheel in a pulley-type tower head fixture proposed by the present invention;

[0036] Fig.13 for Fig.12 A magnified schematic diagram of the structure at point B in the middle.

[0037] In the figure: 1, the main body of the iron tower; 2, the hardware of the hanging point; 3, the high-voltage cable; 4, the bracket of the clamp; 5, the roller; 6, the threading frame; 7, the top tie point; 81, the first pull rope; 82, the second pull rope; 83, the stranded pull rope; 9, the side frame; 10, the threading hole; 11, the pressing plate; 12, the first return spring; 13, the pressing cavity; 14, the extension cavity; 15, the lower pressing plate; 16, the chamfer; 17, the plate; 18, the spring Rod; 19, rubber block; 20, push block; 21, side cavity; 22, inclined hole; 23, slide groove; 24, pull wire; 25, top plate; 26, second return spring; 27, limit baffle; 28, slider; 29, friction wheel; 30, inner cavity; 31, wheel bracket; 32, shaft hole; 33, rotating shaft; 34, swing bracket; 35, shaft pin; 36, limit plate; 37, arc baffle; 38, spring. DETAILED DESCRIPTION

[0038] Reference Figure 1-Figure 13A pulley-type tower head fixture comprises a plurality of iron tower bodies 1 and a plurality of hanging point hardware 2 arranged on the iron tower bodies 1, a high-voltage cable 3 is arranged between two adjacent iron tower bodies 1, a fixture bracket 4 is arranged on the high-voltage cable 3, and rollers 5 clamped on the high-voltage cable 3 are arranged at both ends of the fixture bracket 4, a threading frame 6 is arranged on the fixture bracket 4, and the high-voltage cable 3 passes through the threading frame 6 through a threading hole 10, wherein the threading frame 6 is a buckling structure, the high-voltage cable 3 is buckled into the threading hole 10 in the threading frame 6, and then is buckled and fixed on the fixture bracket 4, and hung on the high-voltage cable 3, wherein the threading frame 6 clamps the corresponding overhead ground wire and insulator, and then the operator standing on the ground needs to continuously pull the combined pull rope 83 to complete the unidirectional climbing and sliding of the fixture bracket 4 on the high-voltage cable 3.

[0039] Reference Figure 3 As shown, the figure is a cross-sectional view, and two pressing cavities 13 are symmetrically opened on the threading frame 6, and pressing plates 11 are slidably arranged on the two pressing cavities 13, and the first pull rope 81 and the second pull rope 82 are respectively placed on the top of the pressing plates 11 on both sides of the threading frame 6, so that the first pull rope 81 and the second pull rope 82 can apply pressure to the pressing plate 11 during the process of pulling the combined pull rope 83.

[0040] Reference Figure 4 , Figure 7 and Figure 8 The pressing plate 11 is reset and lifted and slid in the pressing cavity 13 by the first return spring 12, an extending cavity 14 is provided on the side wall of the rope threading hole 10, and the rubber block 19 slides in the extending cavity 14. A lower pressing plate 15 extending into the extending cavity 14 is provided at the bottom of the pressing plate 11, and a chamfer 16 is provided at the bottom of the lower pressing plate 15. A resist plate 17 which is retracted and extended in the extending cavity 14 by a fourth return spring is provided in the extending cavity 14. The resist plate 17 and the rubber block 19 are connected by an elastic rod 18 which is arranged obliquely. In this way, after the first pull rope 81 and the second pull rope 82 apply pressure to the pressing plate 11, the downward pressure of the pressing plate 11 will drive the lower pressing plate 15 to descend together. Due to the existence of the chamfer 16, it will move against the resist plate 17, that is, the downward pressure of the two pressing plates 11 will drive the lower pressing plate 15 to slide against the rubber block 19 on the resist plate 17 toward the extending cavity 14, that is, the downward positioning of the rubber block 19 on the high-voltage cable 3 is released.

[0041] It should be noted that, refer to Fig. 9 State, in which the rubber block 19 is positioned to slide down the high-voltage cable 3. When the climbing stops, the rubber block 19 is against the outer wall of the high-voltage cable 3. If the device slides down, the rubber block 19 and the high-voltage cable 3 have a sliding tendency. Since the elastic rod 18 is an elastic rod, the elastic rod 18 will swing, so it can exert pressure on the outer wall of the high-voltage cable 3, thereby stopping the sliding tendency.

[0042] The threading frame 6 is provided with a first pull rope 81 and a second pull rope 82 hanging on both sides of the threading frame 6. The other ends of the first pull rope 81 and the second pull rope 82 are twisted into a combined pull rope 83. The first pull rope 81 and the second pull rope 82 are twisted at the bottom of the high-voltage cable 3. This arrangement makes it easy for the first pull rope 81 and the second pull rope 82 to be located on both sides of the high-voltage cable 3 to drive the rubber blocks 19 on both sides to move. The combined pull rope 83 passes through the threading frame 6 through the inclined hole 22, and the first pull rope 81 and the second pull rope 82 release the extrusion on the side wall of the high-voltage cable 3 through the rubber block 19.

[0043] The side wall of the threading frame 6 is provided with a side frame 9, and a top plate 25 is provided above the side frame 9. A hole is opened on the top plate 25, and the twisting points of the first pull rope 81 and the second pull rope 82 are fixed in the hole. The combined pull rope 83 passes through the top plate 25 and the side frame 9, and passes through the inclined hole 22. A second return spring 26 is connected between the top plate 25 and the side frame 9. The first pull rope 81 and the second pull rope 82 are fixed to the top of the threading frame 6 through the top tie point 7. In this way, when the operator pulls the combined pull rope 83, the top plate 25 is simultaneously driven to press down and squeeze the second return spring 26, thereby completing the storage of the second return spring 26, and at the same time, the push block 20 sliding in the side cavity 21 can be separated from the threading frame 6, so as to form Figure 3 and Figure 5 Two states.

[0044] A side cavity 21 is provided on the threading rack 6, and a push block 20 slides in the side cavity 21 through a slide groove 23 and a slider 28. A limit baffle 27 is provided on the threading rack 6 for limiting the push block 20. A third reset spring is provided in the slide groove 23 for resetting the push block 20. Therefore, when the push block 20 on the threading rack 6 is pulled apart by the combined pull rope 83, the rotation of the friction wheel 29 will be triggered.

[0045] A friction wheel 29 is provided inside the threading frame 6 to squeeze the outer wall of the high-voltage cable 3 and drive the clamp bracket 4 to move.

[0046] An inner cavity 30 is provided in the threading frame 6, and the friction wheel 29 rotates in the inner cavity 30 through a wheel bracket 31. An axial hole 32 is opened at the axis of the friction wheel 29, and a rotating shaft 33 that drives the friction wheel 29 to rotate in one direction is provided in the axial hole 32. At this time, the swing bracket 34 on the rotating shaft 33, under the action of the limit plate 36, presses against the arc baffle 37 to drive the friction wheel 29 to rotate. Since the friction wheel 29 is against the high-voltage cable 3, it will move the clamp bracket 4 to a higher place on the high-voltage cable 3.

[0047] A pull wire 24 is wound around the rotating shaft 33, and the other end of the pull wire 24 extends out of the side cavity 21 and is connected to the push block 20. A spring 38 is provided at one end of the rotating shaft 33 for resetting the rotating shaft 33. When the combined pull rope 83 is pulled down, it will slide on the side cavity 21 against the push block 20, thereby pulling the pull wire 24 and driving the rotating shaft 33 to rotate, thereby completing the power storage of the spring 38.

[0048] The outer wall of the rotating shaft 33 is provided with a plurality of swing brackets 34 that abut against the side wall of the shaft hole 32, and the swing bracket 34 rotates on the outer wall of the rotating shaft 33 through the shaft pin 35, and the inner wall of the shaft hole 32 is circumferentially provided with an arc-shaped baffle 37, and the outer wall of the rotating shaft 33 is fixed with a limit plate 36, and the limit plate 36 and the arc-shaped baffle 37 are staggered. After the combined pull rope 83 is loosened, the rotating shaft 33 rotates in the opposite direction under the action of the spring 38 and the first return spring 12, but there is no limit of the limit plate 36, and the swing bracket 34 cannot abut against the arc-shaped baffle 37 at this time, so the reversed rotating shaft 33 will not rotate with the friction wheel 29; at the same time, the rubber block 19 abuts against the high-voltage cable 3 again and completes the downward positioning.

[0049] That is, by the continuous pulling of the stranded pull rope 83 by the ground personnel, the rubber block 19 is released from the limit, and the friction wheel 29 rotates to frictionally roll the high-voltage cable 3 for climbing; and after letting go, the rubber block 19 squeezes the high-voltage cable 3 again to achieve the downward limit, and the reversed rotating shaft 33 will not rotate with the friction wheel 29, thereby facilitating the next climbing operation.

[0050] The working principle of the present invention is as follows:

[0051] S1: The threading frame 6 is a buckling structure, the high-voltage cable 3 is buckled into the threading hole 10 in the threading frame 6, and then the buckle is fixed on the clamp bracket 4, and hung on the high-voltage cable 3, wherein the threading frame 6 is clamped with the corresponding overhead ground wire and insulator, and then the operator standing on the ground needs to continuously pull the stranded pull rope 83 to complete the unidirectional climbing and sliding of the clamp bracket 4 on the high-voltage cable 3;

[0052] S2: When pulling the combined pull rope 83, the first pull rope 81 and the second pull rope 82 will first press the two pressing plates 11 on the side wall of the threading frame 6, and the downward pressure of the two pressing plates 11 will drive the lower pressing plate 15 to slide against the rubber block 19 on the support plate 17 toward the extension cavity 14, that is, the rubber block 19 releases the downward positioning of the high-voltage cable 3;

[0053] S3: When the combined pull rope 83 is pulled down, it will slide against the push block 20 on the side cavity 21, thereby pulling the pull wire 24 and driving the rotating shaft 33 to rotate, and completing the power storage of the mainspring 38. At this time, the swing bracket 34 on the rotating shaft 33, under the action of the limit plate 36, drives the friction wheel 29 to rotate against the arc baffle 37. Since the friction wheel 29 is against the high-voltage cable 3, it will move the clamp bracket 4 to a higher position on the high-voltage cable 3;

[0054] S4: After the stranded pull rope 83 is loosened, the rotating shaft 33 rotates in the opposite direction under the action of the mainspring 38 and the first return spring 12, but there is no limit plate 36, so the swing bracket 34 cannot press against the arc baffle 37 at this time, so the reversed rotating shaft 33 will not rotate with the friction wheel 29; at the same time, the rubber block 19 presses against the high-voltage cable 3 again and completes the downward positioning.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pulley-type tower head fixture, comprising a plurality of iron tower bodies and a plurality of hanging point hardware arranged on the iron tower bodies, wherein a high voltage cable is arranged between two adjacent iron tower bodies, characterized in that: The high-voltage cable is provided with a clamp bracket, and rollers clamped on the high-voltage cable are provided at both ends of the clamp bracket, a threading frame is provided on the clamp bracket, and the high-voltage cable passes through the threading frame through the rope threading hole, and a first pull rope and a second pull rope are provided on the threading frame hanging on both sides of the threading frame, one end of the first pull rope and the second pull rope are fixed to the top of the threading frame through the top tie point, and the other ends of the first pull rope and the second pull rope are twisted into a stranded pull rope, and the stranded pull rope passes through the threading frame through the inclined hole, and the first pull rope and the second pull rope are relieved from squeezing the side wall of the high-voltage cable through a rubber block, and a friction wheel is provided in the threading frame that squeezes the outer wall of the high-voltage cable and drives the clamp bracket to move, and a side cavity is opened on the threading frame, and a push block is slidable in the side cavity through a slide groove and a slider, and a limit baffle for limiting the push block is provided on the threading frame, and a first pull rope for resetting the push block is provided in the slide groove. Three reset springs, two pressing cavities are symmetrically provided on the threading frame, and pressing plates are slidably arranged on the two pressing cavities, the first pull rope and the second pull rope are respectively placed on the top of the pressing plates on both sides of the threading frame, the first pull rope and the second pull rope are twisted at the bottom of the high-voltage cable, an inner cavity is provided in the threading frame, the friction wheel rotates in the inner cavity through the wheel bracket, an axial hole is provided at the axis of the friction wheel, a rotating shaft for driving the friction wheel to rotate unidirectionally is provided in the axial hole, a pull wire is wound around the rotating shaft, and the other end of the pull wire extends out of the side cavity and is connected to the push block, a spring is provided at one end of the rotating shaft for resetting the rotating shaft, and when the combined pull rope is pulled, the first pull rope and the second pull rope will be driven to press the two pressing plates, and the downward pressure of the two pressing plates will drive the rubber block to slide to release the downward positioning of the high-voltage cable, and the combined pull rope will slide on the side cavity against the push block during the downward pulling process.

2. A pulley type tower head fixture according to claim 1, characterized in that: The pressing plate is reset, lifted and slid in the pressing cavity by the first reset spring, an extension cavity is provided on the side wall of the rope threading hole, and the rubber block slides in the extension cavity, a lower pressing plate extending into the extension cavity is provided at the bottom of the pressing plate, a chamfer is provided at the bottom of the lower pressing plate, a resist plate is provided in the extension cavity and is retracted and extended in the extension cavity by the fourth reset spring, and the resist plate and the rubber block are connected by an elastic rod arranged obliquely.

3. A pulley type tower head fixture according to claim 2, characterized in that: The side wall of the threading frame is provided with a side frame, and a top plate is provided above the side frame. The top plate is provided with holes, and the twisting points of the first pull rope and the second pull rope are fixed in the holes. The twisted pull rope passes through the top plate and the side frame and passes through the inclined hole. A second return spring is connected between the top plate and the side frame, and the first pull rope and the second pull rope are fixed to the top of the threading frame through the top tie point.

4. A pulley type tower head fixture according to claim 3, characterized in that: The outer wall of the rotating shaft is provided with a plurality of swing brackets which abut against the side wall of the shaft hole, and the swing brackets rotate on the outer wall of the rotating shaft through shaft pins, and the inner wall of the shaft hole is circumferentially provided with an arc-shaped baffle.

5. A pulley type tower head fixture according to claim 4, characterized in that: A limit plate is fixed on the outer side wall of the rotating shaft, and the limit plate and the arc-shaped baffle are staggered.

6. A method for using a pulley type tower head fixture, using the pulley type tower head fixture in claim 5, characterized in that: The specific operation method is as follows: S1: The threading frame is a buckle structure. The high-voltage cable is buckled into the threading hole in the threading frame, and then the buckle is fixed on the fixture bracket and hung on the high-voltage cable. The threading frame is clamped with the corresponding overhead ground wire and insulator. Then the operator standing on the ground needs to continuously pull the stranded rope to complete the unidirectional climbing and sliding of the fixture bracket on the high-voltage cable. S2: When pulling the combined pull rope, the first pull rope and the second pull rope will first press the two pressing plates on the side wall of the threading frame. The downward pressure of the two pressing plates will drive the lower pressing plate to slide against the rubber block on the plate toward the extension cavity, that is, the rubber block releases the downward positioning of the high-voltage cable; S3: When the combined pull rope is pulled down, it will slide against the push block on the side cavity, thereby pulling the pull rope and driving the rotating shaft to rotate, and completing the power storage of the mainspring. At this time, the swing bracket on the rotating shaft, under the action of the limit plate, drives the friction wheel to rotate against the arc baffle. Since the friction wheel is against the high-voltage cable, it will move the fixture bracket to a higher place on the high-voltage cable; S4: After the stranded pull rope is loosened, the rotating shaft rotates in the opposite direction under the action of the mainspring and the first reset spring, but there is no limit plate. At this time, the swing bracket cannot press against the arc baffle, so the reversed rotating shaft does not rotate with the friction wheel; at the same time, the rubber block presses against the high-voltage cable again and completes the downward positioning.

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