Electric pole insulator replacement mechanism and replacement method

Abstract

The invention belongs to the field of strategic power transmission line maintenance, and particularly relates to an electric pole insulator replacement mechanism and method. The electric pole insulator replacement mechanism comprises a support, the front end of the support is fixedly connected with a cross arm, the front side of the cross arm is connected with one end of an insulator string, and the other end of the insulator string is connected with a coating sleeve; the cable is fixedly sleeved with a positioning block, and the positioning block is used for being matched with the coating sleeve in a sleeving mode; the support is provided with a traction mechanism, the output end of the traction mechanism is used for being connected with a positioning block, the traction mechanism is arranged on the support, the output end of the traction mechanism is connected to the positioning block on the cable, the cable can be actively pulled before replacement, and therefore the wire tension originally borne by an insulator chain is transferred to the support and the traction mechanism. Therefore, the insulator string is in a relaxed state when being disassembled, and does not need to resist the tension of a lead, thereby greatly reducing the disassembly difficulty and the physical output of an operator, and improving the operation safety.

Description

Technical Field

[0001] This invention belongs to the field of power transmission line maintenance, specifically relating to a pole insulator replacement mechanism and replacement method. Background Technology

[0002] Pole insulators are key insulation components of overhead power lines. They are exposed to the outdoor environment for a long time and are easily damaged by factors such as aging, lightning strikes, and pollution. They need to be replaced in time to ensure the safe and stable operation of the power grid.

[0003] Currently, traditional methods for replacing pole insulator strings have two main problems: First, power outage replacement, which involves cutting off power to the line and having workers climb the pole to disconnect the insulator strings from the crossarms and conductors before replacement. This method directly affects power supply reliability and causes economic losses. Second, live-line work, such as using insulated bucket trucks or ground potential / intermediate potential methods, requires extremely high skill levels from workers, carries significant safety risks, and is severely constrained by environmental factors such as terrain and weather.

[0004] Existing technologies also include some auxiliary replacement devices designed to simplify the process. However, these devices mostly focus on providing an installation platform or assisting in lifting insulators, and generally lack a mechanism to pre-transfer and controllably bear the conductor load before operation. During replacement, the tension of the cable still acts directly on the insulator string to be disassembled, making disassembly difficult. It requires operators to use special tools for high-intensity wire winding and unwinding operations, which is not only time-consuming and labor-intensive, but also increases the complexity and safety risks of operation in a live environment. In addition, the connection structure between the conductor and the end of the insulator string is usually permanently fixed (such as using tension clamps), making disassembly cumbersome and not conducive to rapid replacement.

[0005] Therefore, how to design a safe, efficient, and significantly reduced-labor-intensive insulator replacement mechanism has become a pressing technical problem to be solved in this field. Summary of the Invention

[0006] To address the above problems, this invention provides a pole insulator replacement mechanism and replacement method.

[0007] The objective of this invention is achieved in the following manner: a pole insulator replacement mechanism, comprising a support 1, a crossarm 2 fixedly connected to the front end of the support 1, one end of an insulator string 3 connected to the front side of the crossarm 2, and a sheath 4 connected to the other end of the insulator string 3; further comprising a cable 5, wherein a positioning block 51 is fixedly fitted on the outside of the cable 5, the positioning block 51 being used to engage with the sheath 4; a pulling mechanism is provided on the support 1, the output end of the pulling mechanism being used to connect to the positioning block 51.

[0008] Furthermore, a winding mechanism 6 is provided at the bottom of the bracket 1. The winding mechanism 6 includes a winding bracket 61, which is fixedly connected to the bracket 1. A winding roller 62 is rotatably mounted on the winding bracket 61. A drive mechanism 63 is fixedly connected to the bracket 1 on the side of the winding bracket 61. The output end of the drive mechanism 63 is fixedly connected to the winding roller 62. A pulley bracket 64 is fixedly connected to the top of the bracket 1. A fixed pulley 65 is rotatably connected inside the pulley bracket 64. One end of the winding roller 62 is fixedly connected to a pull rope 66. The other end of the pull rope 66 passes around the fixed pulley 65 and is fixedly connected to a hook 67.

[0009] Furthermore, the top of the positioning block 51 is fixedly connected to a hook 52 that cooperates with the hook 67.

[0010] Furthermore, the bracket 1 is a triangular frame, which includes a base rod and a side rod fixedly connected to each side of the base rod. The tops of the two side rods are fixedly connected to form the apex of the triangle. A pulley bracket 64 is fixedly connected to the front end of the apex of the triangular frame, and a winding bracket 61 is fixedly connected to the top of the base rod of the triangular frame. The triangular frame is used to be fixedly connected to one side of the top of the pole.

[0011] Furthermore, a first angle iron 11 is fixedly connected to each of the two front ends of the bracket 1. One side of the crossarm 2 abuts against the first angle iron 11, and the other side of the crossarm 2 abuts against the second angle iron 12. The first angle iron 11 and the second angle iron 12 are connected and fixed by a connector, so that the crossarm 2 is clamped and fixed.

[0012] Furthermore, the front side of the crossarm 2 is fixedly connected to the mounting bracket 21, and the mounting bracket 21 is connected to one end of the insulator string 3 through a connector.

[0013] Furthermore, the positioning block 51 is an L-shaped block, the cable 5 is fixed inside the L-shaped block, and both ends of the cable 5 extend out from both ends of the L-shaped block.

[0014] Furthermore, the covering sleeve 4 includes a sleeve body 41 with an opening on one side. A cover plate 42 is hinged to one side of the opening of the sleeve body 41. After the sleeve body 41 and the cover plate 42 are fastened together, a limiting chamber for the positioning block 51 is formed between them. The limiting chamber has a channel for the two ends of the cable 5 to extend out. A first locking plate 43 is fixedly connected to the side of the cover plate 42. A second locking plate 44 that cooperates with the first locking plate 43 is fixedly connected to the sleeve body 41. A clearance groove is provided on the top of the sleeve body 41 for the hanging ear 52 to extend out and separate from the sleeve body 41.

[0015] A method for replacing pole insulators as described above, the method comprising the following steps: S1. A bracket 1 is fixed at the top of the pole. An insulator string 3 is connected to the bracket 1 via a crossarm 2. The insulator string 3 is connected to the cable 5. A detachable structure that is easy to disassemble is installed on the insulator string 3. The cable 5 is installed inside the detachable structure. S2. Install the traction mechanism on bracket 1; S3. When replacing insulator string 3, connect the output end of the pulling mechanism to cable 5, and then let the pulling mechanism apply a pulling force toward bracket 1 to insulator string 3 until the body of insulator string 3 is relaxed. S4. Remove the separable structure and remove the insulator string 3 from the crossarm 2; S5. Replace with a new insulator string 3 and fix the new insulator string 3 to the crossarm 2 and the cable 5 respectively; S6. Reduce the pulling force of the pulling mechanism until the insulator string 3 is taut, the output end of the pulling mechanism is relaxed, and the output end of the pulling mechanism is separated from the cable 5.

[0016] Compared to existing technologies, this invention, by incorporating a pulling mechanism on the support and connecting its output end to a positioning block on the cable, allows for active cable pulling before replacement. This transfers the conductor tension, originally borne by the insulator string, to the support and pulling mechanism. This ensures the insulator string is in a relaxed state during disassembly, eliminating the need to resist conductor tension, significantly reducing disassembly difficulty and worker fatigue, and improving operational safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the front structure of the insulator replacement mechanism; Figure 2 This is a schematic diagram of the rear structure of the insulator replacement mechanism; Figure 3 This is a schematic diagram of the insulator string being released when the cable is being pulled by the insulator replacement mechanism. Figure 4 This is a schematic diagram showing the connection between the top of the pole and the cable via an insulator replacement mechanism.

[0018] The components include: bracket 1, first angle iron 11, second angle iron 12, crossarm 2, mounting bracket 21, insulator string 3, sheath 4, sleeve body 41, cover plate 42, first locking plate 43, second locking plate 44, cable 5, positioning block 51, hanging ear 52, winding mechanism 6, winding bracket 61, winding roller 62, drive mechanism 63, pulley bracket 64, fixed pulley 65, pull rope 66, and pull hook 67. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0021] As attached Figure 1-4 As shown, a pole insulator replacement mechanism is pre-installed on a pole or tower for safe and convenient replacement of insulator strings 3 during subsequent maintenance. It includes a support 1, with a crossarm 2 fixedly connected to its front end. One end of the insulator string 3 is connected to the front side of the crossarm 2, and the other end of the insulator string 3 is connected to a sheath 4. It also includes a cable 5, with a positioning block 51 fixedly fitted onto its exterior. The positioning block 51 engages with the sheath 4. A pulling mechanism is provided on the support 1, and the output end of the pulling mechanism is connected to the positioning block 51.

[0022] Furthermore, a winding mechanism 6 is provided at the bottom of the bracket 1. The winding mechanism 6 includes a winding bracket 61, which is fixedly connected to the bracket 1. A winding roller 62 is rotatably mounted on the winding bracket 61. A drive mechanism 63 is fixedly connected to the bracket 1 on the side of the winding bracket 61. The drive mechanism 63 is preferably a motor installed inside the sealed box, with only the output shaft extending out of the sealed box and a sealing ring provided between it and the sealed box. The output end of the drive mechanism 63 is fixedly connected to the winding roller 62. A pulley bracket 64 is fixedly connected to the top of the bracket 1. A fixed pulley 65 is rotatably connected inside the pulley bracket 64. One end of a pull rope 66 is fixedly connected to the winding roller 62. The other end of the pull rope 66 passes around the fixed pulley 65 and is fixedly connected to a hook 67. The pull rope 66 is a high-strength insulated nylon rope.

[0023] The motor winding mechanism can be a hydraulic cylinder or a linear electric actuator fixed on a bracket, with the piston rod end directly or via a soft cable connected to the positioning block.

[0024] Furthermore, the top of the positioning block 51 is fixedly connected to a hook 52 that cooperates with the hook 67.

[0025] Furthermore, the bracket 1 is a triangular frame, which includes a base rod and a side rod fixedly connected to each side of the base rod. The tops of the two side rods are fixedly connected to form the apex of the triangle, making the structure stable. A pulley bracket 64 is fixedly connected to the front end of the apex of the triangular frame, and a winding bracket 61 is fixedly connected to the top of the base rod of the triangular frame. The triangular frame is used to be fixedly connected to one side of the top of the pole.

[0026] A first angle iron 11 is fixedly connected to each of the two front ends of the bracket 1. One side of the crossarm 2 abuts against the first angle iron 11, and the other side of the crossarm 2 abuts against the second angle iron 12. The first angle iron 11 and the second angle iron 12 are connected and fixed by a connector, so that the crossarm 2 is clamped and fixed.

[0027] Furthermore, a mounting bracket 21 is fixedly connected to the front side of the crossarm 2, and the mounting bracket 21 is connected to one end of the insulator string 3 via a connector. The support 1 can also be designed as a portal frame, pole-mounted frame, or other stable structures depending on the pole structure. The connection between the crossarm 2 and the support 1 can also be achieved by direct insertion followed by fixing with pins.

[0028] Furthermore, the positioning block 51 is an L-shaped block, the cable 5 is fixed inside the L-shaped block, and both ends of the cable 5 extend out from both ends of the L-shaped block.

[0029] The covering sleeve 4 is preferably made of insulating material and includes a sleeve body 41 with an opening on one side. A cover plate 42 is hinged to the opening side of the sleeve body 41 by a structure such as a hinge. After the sleeve body 41 and the cover plate 42 are fastened together, a limiting chamber for the positioning block 51 is formed between them. The limiting chamber has a channel for the two ends of the cable 5 to extend out. A first locking plate 43 is fixedly connected to the side of the cover plate 42. A second locking plate 44 that cooperates with the first locking plate 43 is fixedly connected to the sleeve body 41. A clearance groove is provided on the top of the sleeve body 41 for the hanging ear 52 to extend out and separate from the sleeve body 41.

[0030] The sheath 4 can be designed as an integral fixed structure with the insulator string 3, and the sheath 4 can be used as a replacement part. Alternatively, the sheath 4 and the insulator string 3 can be designed as a separable structure, and the sheath 4 can be used for a long time.

[0031] The fit between the positioning block 51 and the covering sleeve 4 is not limited to an L-shape; it can also be T-shaped, rectangular, etc., as long as it can achieve axial limiting and torsional constraint. The locking method can also adopt quick-locking devices such as snap-fit ​​or eccentric wheel locking.

[0032] A method for replacing pole insulators, characterized in that the method includes the following steps: S1. A bracket 1 is fixed to the top of the pole. An insulator string 3 is connected to the bracket 1 via a crossarm 2. The insulator string 3 is connected to the cable 5. A detachable structure for easy disassembly is installed on the insulator string 3, and the cable 5 is installed inside the detachable structure. During pole erection or modification, the bracket 1 is firmly installed at the predetermined position on the pole. The crossarm 2 is fixed to the bracket 1 via angle irons 11 and 12. The upper end of the insulator string 3 is connected to the mounting bracket 21 of the crossarm 2, and the lower end is connected to the sleeve 41 of the sheath 4. The cable 5 is crimped or fixed in the L-shaped positioning block 51, and then the positioning block 51 is placed into the open sheath 4. The cover plate 42 is closed, and the locking plates 43 and 44 are used to lock it, completing the connection between the cable and the insulator. The winding mechanism 6 is in standby mode, and the hook 67 is retracted.

[0033] S2. Install the traction mechanism on bracket 1; S3. When replacing insulator string 3, connect the output end of the pulling mechanism to cable 5, and then apply a pulling force towards bracket 1 to insulator string 3 until the insulator string 3 body is relaxed. When it is necessary to replace insulator string 3, the operator uses the insulated operating rod to hook the hook 67 of the winding mechanism 6 onto the lug 52 of the positioning block 51. Start the drive mechanism 63 to drive the winding roller 62 to slowly wind up the pull rope 66. After changing direction through the fixed pulley 65, the hook 67 generates a pulling force towards the top of bracket 1 on the lug 52. This pulling force gradually transfers the tension of cable 5 from insulator string 3 until insulator string 3 is completely relaxed and can be observed with the naked eye or judged by a tension sensor.

[0034] S4. Remove the separable structure and remove the insulator string 3 from the crossarm 2; S5. Replace with a new insulator string 3 and fix the new insulator string 3 to the crossarm 2 and the cable 5 respectively; With insulator string 3 relaxed and the load already borne by the tensioning mechanism, workers can safely: Unlock the connectors of the first and second locking plates 43 and 44 on the cover sleeve 4, or cut off the first and second locking plates 43 and 44 directly with insulating shears as replacement parts, open the cover plate 42, and separate the cover sleeve 4 from the positioning block 51.

[0035] Remove the connecting bolts between the top of the insulator string 3 and the mounting bracket 21, and remove the old insulator string 3 as a whole.

[0036] The upper end of the new insulator string 3 is installed on the mounting bracket 21, and the lower end is connected to the cover sleeve 4.

[0037] Open the cover plate 42 of the cover sleeve 4 again, put the cable 5 with the positioning block 51, which has been held by the hook 67, into the sleeve body 41, and fasten and lock the cover plate 42.

[0038] S6. Reduce the pulling force of the pulling mechanism until the insulator string 3 is taut and the output end of the pulling mechanism is relaxed. Separate the output end of the pulling mechanism from the cable 5, and control the drive mechanism 63 to slowly reverse, releasing the pull rope 66 and gradually reducing the pulling force on the cable 5. As the pulling force decreases, the tension of the cable 5 gradually transfers back to the new insulator string 3 until the insulator string 3 is taut again and returns to its normal stress state. At this time, the hook 67 and the pull rope 66 become relaxed again. Use the insulated operating rod to remove the hook 67 from the lug 52 and retract it to a position that will not affect the operation of the line. The replacement operation is complete.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A pole insulator replacement mechanism, characterized in that: The system includes a support (1), with a crossarm (2) fixedly connected to the front end of the support (1), and one end of an insulator string (3) connected to the front side of the crossarm (2), and the other end of the insulator string (3) connected to a sheath (4); it also includes a cable (5), with a positioning block (51) fixedly fitted on the outside of the cable (5), and the positioning block (51) is used to engage with the sheath (4); a pulling mechanism is provided on the support (1), and the output end of the pulling mechanism is used to connect to the positioning block (51).

2. The pole insulator replacement mechanism as described in claim 1, characterized in that: The bottom of the bracket (1) is provided with a winding mechanism (6), the winding mechanism (6) includes a winding bracket (61), the winding bracket (61) is fixedly connected to the bracket (1), a winding roller (62) is rotatably arranged on the winding bracket (61), a driving mechanism (63) is fixedly connected to the bracket (1) on the side of the winding bracket (61), and the output end of the driving mechanism (63) is fixedly connected to the winding roller (62); the top of the bracket (1) is fixedly connected to a pulley bracket (64), a fixed pulley (65) is rotatably connected inside the pulley bracket (64), and one end of the winding roller (62) is fixedly connected to a pull rope (66), and the other end of the pull rope (66) passes around the fixed pulley (65) and is fixedly connected to a hook (67).

3. The pole insulator replacement mechanism as described in claim 2, characterized in that: The top of the positioning block (51) is fixedly connected to a hook (52) that cooperates with the hook (67).

4. The pole insulator replacement mechanism as described in claim 2, characterized in that: The bracket (1) is a triangular frame, which includes a base rod and a side rod fixedly connected to both sides of the base rod. The tops of the two side rods are fixedly connected to form the apex of the triangle. A pulley bracket (64) is fixedly connected to the front end of the apex of the triangular frame, and a winding bracket (61) is fixedly connected to the top of the base rod of the triangular frame. The triangular frame is used to be fixedly connected to one side of the top of the pole.

5. The pole insulator replacement mechanism as described in claim 2, characterized in that: The bracket (1) has a first angle iron (11) fixedly connected to each of its two front ends. One side of the crossarm (2) abuts against the first angle iron (11), and the other side of the crossarm (2) abuts against the second angle iron (12). The first angle iron (11) and the second angle iron (12) are connected and fixed by a connector, so that the crossarm (2) is clamped and fixed.

6. The pole insulator replacement mechanism as described in claim 2, characterized in that: The front side of the crossarm (2) is fixedly connected to the mounting bracket (21), and the mounting bracket (21) is connected to one end of the insulator string (3) through a connector.

7. The pole insulator replacement mechanism as described in claim 3, characterized in that: The positioning block (51) is an L-shaped block, the cable (5) is fixed inside the L-shaped block, and the two ends of the cable (5) extend from the two ends of the L-shaped block respectively.

8. The pole insulator replacement mechanism as described in claim 7, characterized in that: The covering sleeve (4) includes a sleeve body (41) with an opening on one side. A cover plate (42) is hinged to one side of the opening of the sleeve body (41). After the sleeve body (41) and the cover plate (42) are fastened together, a limiting chamber for the positioning block (51) is formed between them. The limiting chamber has a channel for the two ends of the cable (5) to extend out. A first locking plate (43) is fixedly connected to the side of the cover plate (42). A second locking plate (44) that cooperates with the first locking plate (43) is fixedly connected to the sleeve body (41). A clearance groove is provided on the top of the sleeve body (41) for the hanging ear (52) to extend out and separate from the sleeve body (41).

9. A method for replacing a pole insulator as described in any one of claims 1-8, characterized in that: The method includes the following steps: S1. A bracket (1) is fixed at the top of the pole. An insulator string (3) is connected to the bracket (1) via a crossarm (2). The insulator string (3) is connected to the cable (5). A detachable structure that is easy to disassemble is installed on the insulator string (3). The cable (5) is installed inside the detachable structure. S2. Install a traction mechanism on the bracket (1); S3. When replacing the insulator string (3), connect the output end of the pulling mechanism to the cable (5), and then let the pulling mechanism apply a pulling force toward the support (1) to the insulator string (3) until the insulator string (3) body is relaxed. S4. Remove the separable structure and remove the insulator string (3) from the crossarm (2); S5. Replace with a new insulator string (3) and fix the new insulator string (3) to the crossarm (2) and the cable (5) respectively; S6. Reduce the pulling force of the pulling mechanism until the insulator string (3) is taut and the output end of the pulling mechanism is relaxed, so that the output end of the pulling mechanism is separated from the cable (5).

Images