Channel steel cross arm insulator pulley force - adding replacement device

Abstract

The present application discloses a device for replacing a channel steel cross-arm insulator with additional force, which includes: a channel steel cross-arm fixture and a pulling device; the channel steel cross-arm fixture includes a fixed seat and a hook; a holding portion that is in movable contact and abuts against the top of the channel steel cross-arm is provided on the fixed seat; the first end of the hook is hinged to the first end of the fixed seat near the holding portion, and a hook portion is provided at the second end of the hook; a groove for the first side plate portion of the channel steel cross-arm to be movably clamped into is provided on the hook portion; the bottom of the groove is in contact and abuts against the bottom of the first side plate portion; the second end on the fixed seat extends out of the channel steel cross-arm in a direction away from the hook; the pulling device includes a first pulley, an insulating rope and a second pulley; the first pulley is connected to the fixed seat at the position where it extends out of the channel steel cross-arm, and the pulley of the first pulley is connected to the pulley of the second pulley through the insulating rope; the insulating rope is used to lift the second pulley; the second pulley is connected to the wire through a connecting member. The installation and disassembly are simple, and it is convenient to use, ensuring the efficiency of insulator replacement.

Description

Technical Field

[0001] This application relates to the technical field of electric power operations, and particularly to a device for replacing a channel steel cross-arm insulator with a pulley and additional force. Background Art

[0002] The replacement operation of line insulators frequently occurs in the daily maintenance of transmission lines, and the replacement of insulators needs to be completed through corresponding replacement devices. The existing insulator replacement devices mainly include fixed clamps on the fixed cross-arm and a pulling device installed on the fixed clamps. During the replacement operation, first install the fixed clamps on the cross-arm of the pole tower, and then use the pulling device installed on the fixed clamps to lift the wire, pulling it upward to hold the insulator string, facilitating the replacement of the insulator string between the cross-arm and the wire. However, the existing replacement devices for channel steel cross-arms are cumbersome to install and disassemble, inconvenient to use, and affect the insulator replacement efficiency. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a device for replacing a channel steel cross-arm insulator with a pulley and additional force, which is simple to install and disassemble, convenient to use, and ensures the insulator replacement efficiency.

[0004] To achieve the above technical purpose, this application provides a device for replacing a channel steel cross-arm insulator with a pulley and additional force, including: a channel steel cross-arm clamp and a pulling device;

[0005] The channel steel cross-arm clamp includes a fixed seat and a hook;

[0006] The fixed seat is provided with a holding portion that is in movable contact with and abuts against the top of the channel steel cross-arm;

[0007] The first end of the hook is hinged to the first end of the fixed seat near the holding portion, and the second end of the hook is provided with a hooked portion;

[0008] The hooked portion is provided with a groove for the first side plate portion of the channel steel cross-arm to be movably clamped into;

[0009] The bottom of the groove is in contact with and abuts against the bottom of the first side plate portion;

[0010] The second end of the fixed seat extends out of the channel steel cross-arm in a direction away from the hook;

[0011] The pulling device includes a first pulley, an insulating rope, and a second pulley;

[0012] The first pulley is connected to the fixed seat at the position where it extends out of the channel steel cross-arm, and the pulley of the first pulley is connected to the pulley of the second pulley through an insulating rope;

[0013] The insulating rope is used to lift the second pulley;

[0014] The second pulley is connected to the wire through a connecting piece.

[0015] Further, a first reinforcing rib plate arranged along the length direction of the channel steel cross arm is formed between the abutting portion and the hook claw for avoiding the upper edge of the top of the channel steel cross arm, and the first side wall of the abutting portion facing the hook claw is in contact and fit with the first reinforcing rib plate.

[0016] Further, a first limiting member is further included;

[0017] The first limiting member includes a first connecting portion and a first limiting portion;

[0018] The first end of the first connecting portion is connected to the fixed seat, and the second end of the first connecting portion is vertically connected to the first limiting portion;

[0019] A limiting space for avoiding a second reinforcing rib plate vertically connected to both side walls of the first reinforcing rib plate is formed between the second limiting portion and the fixed seat.

[0020] Further, a second limiting member is further included;

[0021] The second limiting member includes a second connecting portion and a second limiting portion;

[0022] The first end of the second connecting portion is connected to the fixed seat and is located above the first limiting member, and the second end of the second connecting portion is connected to the second limiting portion;

[0023] The bottom of the second limiting portion is in contact and fit with the top of the first limiting member.

[0024] Further, a first magnetic attracting member magnetically attracted and matched with the channel steel cross arm is arranged on the abutting portion.

[0025] Further, the first magnetic attracting member is embedded and fixed at the bottom of the abutting portion, and the magnetic attracting surface of the first magnetic attracting member magnetically attracted and matched with the top of the channel steel cross arm is flush with the bottom surface of the abutting portion.

[0026] Further, a second magnetic attracting member magnetically attracted and matched with the first side plate portion is arranged on the hook claw.

[0027] Further, the second magnetic attracting member is embedded and fixed at the position of the first side wall of the hook claw facing the first side plate portion, and the magnetic attracting surface of the second magnetic attracting member magnetically attracted and matched with the first side plate portion is flush with the position of the first side wall of the hook claw.

[0028] Further, a first installation groove for the first end of the hook claw to movably extend into is formed at the first end of the fixed seat;

[0029] The fixed seat is provided with a first hinge hole penetrating through the first installation groove;

[0030] A second hinge hole is formed in the first end of the hook claw and is matched with the first hinge hole through a pin shaft.

[0031] Furthermore, a second installation groove is formed in the second end of the fixed seat;

[0032] A connecting shaft is provided on the first pulley and penetrates upward through the second installation groove;

[0033] A limiting shaft is vertically penetrated through the shaft section of the connecting shaft extending upward out of the second installation groove;

[0034] A clamping groove for the limiting shaft to be movably embedded is further provided at the top of the fixed seat.

[0035] It can be seen from the above technical solutions that in this application, a channel steel cross arm clamp is formed by setting a fixed seat and a hook claw hinged to the fixed seat. Among them, the fixed seat is provided with a holding portion that is in movable contact and abuts against the top of the channel steel cross arm, and the hook claw is provided with a hooked portion that is hooked and matched with the first side plate portion of the channel steel cross arm; at the same time, the second end of the fixed seat extends out of the channel steel cross arm in a direction away from the hook claw, which is convenient for installing a tensioner; the holding portion of the fixed seat can be used as a support point to support the fixed seat, and the hook claw can provide a force for the fixed seat to balance the force exerted by the tensioner on the fixed seat, so that the fixed seat can be stably installed on the channel steel cross arm and provide stable support for the tensioner. Through the structural design of this channel steel cross arm clamp, the overall installation and disassembly are simple. At the same time, it is combined with a tensioner composed of a first pulley, an insulating rope and a second pulley, which is convenient to use as a whole and ensures the efficiency of insulator replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 It is a schematic structural diagram of the use of the channel steel cross arm insulator pulley force - adding replacement device provided in the present application;

[0038] Figure 2 For Figure 1 The enlarged schematic diagram of position A;

[0039] Figure 3 It is a schematic installation structure diagram of the channel steel cross arm clamp of the channel steel cross arm insulator pulley force - adding replacement device provided in the present application;

[0040] Figure 4 is Figure 3 an explosion schematic diagram;

[0041] Figure 5 is a structural schematic diagram of the channel cross-arm clamp of the channel cross-arm insulator pulley force-increasing replacement device provided in this application without the first limiting member and the second limiting member;

[0042] In the figure: 1. Fixed seat; 11. Abutted part; 12. First installation groove; 121. First hinge hole; 13. Second installation groove; 131. Card slot; 14. Hollow hole; 15. First limiting member; 151. First connecting part; 152. First limiting part; 16. Second limiting member; 161. Second connecting part; 162. Second limiting part; 2. Hook claw; 21. Hook part; 22. Second hinge hole; 3. Channel cross-arm; 31. First side plate part; 32. Second side plate part; 311. First reinforcing rib plate; 312. Second reinforcing rib plate; 41. First magnetic attraction member; 42. Second magnetic attraction member; 5. Pin shaft; 61. First pulley; 611. Connecting shaft; 612. Limiting shaft; 613. Lock pin; 62. Second pulley; 7. Conducting wire; 8. Insulator. Specific embodiments

[0043] Next, the technical solutions of the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the embodiments of this application.

[0044] In the description of the embodiments of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of this application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0046] The embodiments of the present application disclose a device for replacing a channel steel cross arm insulator with a pulley and additional force.

[0047] Please refer to Figure 1 , an embodiment of the device for replacing a channel steel cross arm insulator with a pulley and additional force provided in the embodiments of the present application includes:

[0048] A channel steel cross arm fixture and a pulling device; the channel steel cross arm fixture includes a fixed seat 1 and a hook 2; the fixed seat 1 is provided with a holding portion 11 that is in movable contact with and abuts against the top of the channel steel cross arm 3; the first end of the hook 2 is hinged to the first end of the fixed seat 1 near the holding portion 11, and the second end of the hook 2 is provided with a hooked portion 21; the hooked portion 21 is provided with a groove for the first side plate portion 31 of the channel steel cross arm 3 to be movably inserted; the bottom of the groove is in contact with and abuts against the bottom of the first side plate portion 31; the second end of the fixed seat 1 extends out of the channel steel cross arm 3 in a direction away from the hook 2; the pulling device includes a first pulley 61, an insulating rope, and a second pulley 62; the first pulley 61 is connected to the fixed seat 1 at the position where it extends out of the channel steel cross arm 3, and the pulley of the first pulley 61 is connected to the pulley of the second pulley 62 through the insulating rope; the insulating rope is used to lift the second pulley 62; the second pulley 62 is connected to the wire 7 through a connecting member.

[0049] Specifically, in this embodiment, the holding portion 11 and the fixed seat 1 are integrally formed, and the hooked portion 21 and the hook 2 are integrally formed, which is more convenient for processing and manufacturing; the structure of the fixed seat 1 can be as Figure 1 shown, in the shape of a triangular-like block. Of course, it is not limited to such a structural design only. Those skilled in the art can make appropriate changes based on this, and specific limitations are not made. The second end of the fixed seat 1 is set to extend out of the channel steel cross arm 3 in a direction away from the hook 2, that is, the second end of the fixed seat 1 extends out of the channel steel cross arm 3 along the first side plate portion 31 of the channel steel cross arm 3 towards the second side plate portion 32, which is convenient for providing an installation position for the pulling device. When installing and fixing, the hook 2 can be rotated first to make the hooked portion 21 cooperate with the first side plate portion 31 of the channel steel cross arm 3, and then the holding portion 11 can be made to contact and abut against the top of the channel steel cross arm 3 to achieve fixation, and specific limitations are not made. In addition, both the first pulley 61 and the second pulley 62 in the pulling device can be as Figure 1The pulley block formed by splicing two pulleys as shown makes it more labor-saving to pull the second pulley 62 with the insulating rope. During use, the operator pulls the insulating rope to pull up the second pulley 62. The second pulley 62 hooks the conductor 7 through the connecting hook carried by the second pulley 62 and moves up to a specified height position. At this time, the position of the conductor 7 can be fixed by fixing the insulating rope, thus facilitating the replacement of the insulator 8. During this process, the fixing seat 1 where the pulling device is installed will receive a downward acting force, and the fixing seat 1 can be pulled and fixed by the hook claw 2 at this time to provide a force to balance this acting force, so that the fixing seat 1 can be stably installed on the channel steel cross arm 3 and provide stable support for the pulling device. In order to make the installation of the fixing seat 1 more stable, the contact surface between the bottom of the abutting portion 11 and the top of the channel steel cross arm 3 can be designed to be larger, and specific changes can be made according to actual needs.

[0050] The above is the first embodiment of the channel steel cross arm insulator pulley force - adding replacement device provided by this application. The following is the second embodiment of the channel steel cross arm insulator pulley force - adding replacement device provided by this application. For details, please refer to Figures 1 to 5 。

[0051] A channel steel cross arm insulator pulley force - adding replacement device includes: a channel steel cross arm clamp and a pulling device; the channel steel cross arm clamp includes a fixing seat 1 and a hook claw 2; the fixing seat 1 is provided with an abutting portion 11 that is in movable contact and abuts against the top of the channel steel cross arm 3; the first end of the hook claw 2 is hinged to the first end of the fixing seat 1 near the abutting portion 11, and the second end of the hook claw 2 is provided with a hooked portion 21; the hooked portion 21 is provided with a groove for the first side plate portion 31 of the channel steel cross arm 3 to be movably inserted; the bottom of the groove is in contact and abuts against the bottom of the first side plate portion 31; the second end on the fixing seat 1 extends out of the channel steel cross arm 3 in a direction away from the hook claw 2; the pulling device includes a first pulley 61, an insulating rope, and a second pulley 62; the first pulley 61 is connected to the fixing seat 1 at the position where it extends out of the channel steel cross arm 3, and the pulley of the first pulley 61 is connected to the pulley of the second pulley 62 through the insulating rope; the insulating rope is used to lift the second pulley 62; the second pulley 62 is connected to the conductor 7 through a connecting member.

[0052] Further, a first reinforcing rib plate 311 arranged along the length direction of the channel steel cross arm 3 is formed between the abutting portion 11 and the hook claw 2 for avoiding the upper edge of the top of the channel steel cross arm 3, and the first side walls of the abutting portion 11 and the hook claw 2 facing each other are in contact and fit with the first reinforcing rib plate 311.

[0053] Specifically, for the channel steel cross arm 3, the position directly opposite to the installation of the insulator 8 is usually set as Figures 3 to 5The first reinforcing rib plate 311 shown. In this embodiment, by adjusting the distance relationship between the hook 2 and the abutting portion 11, the first side walls of the abutting portion 11 and the hook 2 facing each other are brought into contact and fit with the first reinforcing rib plate 311, so that the first reinforcing rib plate 311 can also be utilized to provide a certain limiting and blocking effect on the abutting portion 11 in the width direction of the channel steel cross arm 3, making the installation and fixation of the fixing seat 1 more firm.

[0054] Furthermore, it further includes a first limiting member 15; the first limiting member 15 includes a first connecting portion 151 and a first limiting portion 152; the first end of the first connecting portion 151 is connected to the fixing seat 1, and the second end of the first connecting portion 151 is perpendicularly connected to the first limiting portion 152; a limiting space is formed between the second limiting portion 162 and the fixing seat 1 for avoiding the second reinforcing rib plate 312 perpendicularly connected to both side walls of the first reinforcing rib plate 311.

[0055] Specifically, in order to further enhance the ability of the channel steel cross arm 3 at this position to carry the insulator 8, a second reinforcing rib plate 312 perpendicularly connected to the first reinforcing rib plate 311 is usually added. The purpose of the first limiting member 15 provided in this embodiment is to utilize the second reinforcing rib plate 312 to make the installation and fixation of the fixing seat 1 more firm and stable. The first limiting member 15 can be in the shape of Figure 3 shown as a similar L shape. The first end of the first connecting portion 151 can be detachably installed on the fixing seat 1 through fasteners such as screws, and the second limiting portion 162 can be closely attached to the second reinforcing rib plate 312 to provide a certain limiting and blocking effect on the fixing seat 1 in the length direction of the channel steel cross arm 3, making the installation and fixation of the fixing seat 1 more firm.

[0056] Furthermore, it further includes a second limiting member 16; the second limiting member 16 includes a second connecting portion 161 and a second limiting portion 162; the first end of the second connecting portion 161 is connected to the fixing seat 1 and is located above the first limiting member 15, and the second end of the second connecting portion 161 is connected to the second limiting portion 162; the bottom of the second limiting portion 162 is in contact and fit with the top of the first limiting member 15.

[0057] Specifically, in order to make the limiting effect of the first limiting member 15 better, a second limiting member 16 can be added to limit the first limiting member 15, thereby further improving the installation stability of the fixing seat 1. The second limiting member 16 can be as Figure 3 and Figure 4 shown. The second connecting portion 161 can be detachably installed on the fixing seat 1 through fasteners such as screws, and the second limiting portion 162 can be in the shape of a gear, and its teeth are in contact with the top of the first connecting portion 151 of the first limiting member 15 to achieve the limiting of the first limiting member 15.

[0058] Further, a first magnetic attraction member 41 magnetically attracted and engaged with the channel steel cross arm 3 is provided on the abutting portion 11. The first magnetic attraction member 41 can be a permanent magnet. By using the permanent magnet, the contact between the abutting portion 11 and the top of the channel steel cross arm 3 can be strengthened, further improving the installation stability of the fixing base 1. At the same time, during installation, the movement of the fixing base 1 can be reduced through the first magnetic attraction member 41, ensuring the stability of the fixing base 1. Meanwhile, the use of the first magnetic attraction member 41 will not affect the disassembly of the fixing base 1, which is convenient to use. The number of the first magnetic attraction members 41 is not limited. For example, it can be Figure 3 two as shown in; the first magnetic attraction member 41 can be embedded and fixed at the bottom of the abutting portion 11, and the magnetic attraction surface of the first magnetic attraction member 41 magnetically attracted and engaged with the top of the channel steel cross arm 3 is flush with the bottom surface of the abutting portion 11. Of course, it can also be directly sleeved and fixed around the outer periphery of the abutting portion 11, and no specific limitation is made.

[0059] Further, similarly, a second magnetic attraction member 42 magnetically attracted and engaged with the first side plate portion 31 can also be provided on the hook claw 2. Adding the second magnetic attraction member 42 can further stabilize the installation of the fixing base 1 and facilitate the installation of the subsequent retractor. Among them, the second magnetic attraction member 42 can also be embedded and fixed at the position of the first side wall of the hook claw 2 facing the first side plate portion 31, and the magnetic attraction surface of the second magnetic attraction member 42 magnetically attracted and engaged with the first side plate portion 31 is flush with the position of the first side wall of the hook claw 2, and no specific limitation is made.

[0060] Further, a first installation groove 12 for the first end of the hook claw 2 to movably extend into is formed at the first end of the fixing base 1; a first hinge hole 121 penetrating through the first installation groove 12 is formed on the fixing base 1; a second hinge hole 22 adapted to the first hinge hole 121 through a pin shaft 5 is formed at the first end of the hook claw 2. The hinge connection between the hook claw 2 and the fixing base 1 is realized through the pin shaft 5. Among them, the pin shaft 5 can be a quick-release pin, which is more convenient for disassembly, and no specific limitation is made.

[0061] Further, as Figure 2 shown, a second installation groove 13 is formed at the second end of the fixing base 1; a connecting shaft 611 penetrating upward through the second installation groove 13 is provided on the first pulley 61; a limiting shaft 612 is vertically penetrated through the shaft section of the connecting shaft 611 extending upward out of the second installation groove 13; a card slot 131 for the limiting shaft 612 to movably embed is further provided on the top of the fixing base 1.

[0062] Specifically, the second installation groove 13 can be an open groove structure, which facilitates the installation and disassembly cooperation between the connecting shaft 611 and the second installation groove 13. Correspondingly, a locking pin 613 can be detachably arranged on the second installation groove 13 to further restrict the movement of the connecting shaft 611 and prevent the connecting shaft 611 from slipping out of the opening position of the second installation groove 13. In this embodiment, the cooperation between the limiting shaft 612 and the card slot 131 is used to realize the limiting and fixing of the connecting shaft 611. The overall installation and disassembly of the first pulley 61 are convenient, which is conducive to subsequent maintenance.

[0063] Furthermore, a plurality of hollow holes 14 are formed in the fixing seat. The addition of the hollow holes 14 can reduce the overall mass of the fixing seat, making the installation and disassembly more convenient, and at the same time saving manufacturing materials.

[0064] It can be seen from the above technical solutions that the present application constitutes a channel steel cross arm clamp by providing a fixing seat 1 and a hook 2 hinged to the fixing seat 1. The fixing seat 1 is provided with a holding portion 11 that is in movable contact with the top of the channel steel cross arm 3, and the hook 2 is provided with a hook portion 21 that is hooked and matched with the first side plate portion 31 of the channel steel cross arm 3. At the same time, the second end of the fixing seat 1 extends away from the hook 2 and extends out of the channel steel cross arm 3, which is convenient for installing a puller. The holding portion 11 of the fixing seat 1 can be used as a support point to support the fixing seat 1, and the hook 2 can provide a force for the fixing seat 1 to balance the force of the puller acting on the fixing seat 1, so that the fixing seat 1 can be stably installed on the channel steel cross arm 3 and provide stable support for the puller. Through the structural design of the channel steel cross arm clamp, the overall installation and disassembly are simple. At the same time, with the puller composed of the first pulley 61, the insulating rope and the second pulley 62, the overall use is convenient, ensuring the replacement efficiency of the insulator 8.

[0065] The above has introduced in detail the channel steel cross arm insulator pulley force - adding replacement device provided by the present application. For those of ordinary skill in the art, according to the idea of the embodiments of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. Channel steel cross arm insulator pulley force - adding replacement device, characterized in that, Comprising: Channel cross arm clamp and a puller; The channel cross arm clamp includes a fixed seat and a hook claw; The fixed seat is provided with a holding portion that is in movable contact and abuts against the top of the channel cross arm; The first end of the hook claw is hinged to the first end of the fixed seat near the holding portion, and the second end of the hook claw is provided with a hooked portion; The hooked portion is provided with a groove for the first side plate portion of the channel cross arm to be movably inserted; The bottom of the groove contacts and abuts against the bottom of the first side plate portion; The second end on the fixed seat extends out of the channel cross arm in a direction away from the hook claw; The puller includes a first pulley, an insulating rope and a second pulley; The first pulley is connected to the fixed seat at the position where it extends out of the channel cross arm, and the pulley of the first pulley is connected to the pulley of the second pulley through an insulating rope; The insulating rope is used to lift the second pulley; The second pulley is connected to the wire through a connecting member; The holding portion is provided with a first magnetic member that is magnetically coupled with the channel cross arm; The hook claw is provided with a second magnetic member that is magnetically coupled with the first side plate portion.

2. The channel steel cross arm insulator pulley force - increasing replacement device according to claim 1, characterized in that, A first reinforcing rib plate is formed between the holding portion and the hook claw for avoiding the upper edge of the top of the channel cross arm arranged along the length direction of the channel cross arm, and the first side walls of the holding portion and the hook claw facing each other are in contact and fit with the first reinforcing rib plate.

3. The channel steel cross arm insulator pulley force - increasing replacement device according to claim 2, wherein, It further includes a first limiting member; The first limiting member includes a first connecting portion and a first limiting portion; The first end of the first connecting portion is connected to the fixed seat, and the second end of the first connecting portion is vertically connected to the first limiting portion; A limiting space is formed between the first limiting portion and the fixed seat for avoiding the second reinforcing rib plate vertically connected to both side walls of the first reinforcing rib plate.

4. The channel steel cross arm insulator pulley force - adding replacement device according to claim 3, characterized in that, It further includes a second limiting member; The second limiting member includes a second connecting portion and a second limiting portion; The first end of the second connecting portion is connected to the fixed seat and is located above the first limiting member, and the second end of the second connecting portion is connected to the second limiting portion; The bottom of the second limiting portion is in contact and fit with the top of the first limiting member.

5. The channel steel cross-arm insulator pulley force-increasing replacement device according to claim 1, wherein, The first magnetic member is embedded and fixed at the bottom of the holding portion, and the magnetic attracting surface of the first magnetic member magnetically coupled with the top of the channel cross arm is flush with the bottom surface of the holding portion.

6. The channel steel cross arm insulator pulley force - increasing replacement device according to claim 1, characterized in that, The second magnetic member is embedded and fixed at the position of the first side wall of the hook claw facing the first side plate portion, and the magnetic attracting surface of the second magnetic member magnetically coupled with the first side plate portion is flush with the position of the first side wall of the hook claw.

7. The channel steel cross arm insulator pulley force increasing replacement device according to claim 1, characterized in that, A first installation groove for the first end of the hook claw to movably extend into is formed on the first end of the fixed seat; A first hinge hole penetrating through the first installation groove is formed on the fixed seat; A second hinge hole is formed on the first end of the hook claw and is matched with the first hinge hole through a pin shaft.

8. The channel steel cross arm insulator pulley force - increasing replacement device according to claim 1, characterized in that, A second installation groove is formed on the second end of the fixed seat; The first pulley is provided with a connecting shaft that penetrates upward through the second installation groove; A limiting shaft is vertically penetrated through the shaft section of the connecting shaft extending upward out of the second installation groove; A clamping groove for the limiting shaft to movably embed is further provided on the top of the fixed seat.

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