Power transmission line composite cross arm live-line replacement device

Abstract

The application discloses a kind of transmission line composite cross arm live replacement device, including support mechanism, including frame body, screw rod located in the front end of the frame body, hoisting plate located in the upper part of frame body, fixed drum located in the inner side of the frame body, movable drum located in the rear end of the frame body and regulating means located in the inside of the frame body;Upper adjusting mechanism, including upper rotating rod, the periphery of the upper rotating rod is provided with upper convex rib, and one end of the upper rotating rod is provided with upper positioning block.The application has simple structure, convenient installation operation, and the replacement of composite cross arm can be completed by the personnel in ground potential, and the gravity of the conductor to be replaced composite cross arm can be transferred to the upper composite cross arm or ground line cross arm, which facilitates the subsequent whole set or single removal and assembly of composite cross arm, and the position of movable drum 105 is adjustable, which reduces the limitations of replacement device, and meets the use needs of users in different operating conditions.

Description

Technical Field

[0001] This invention relates to the field of composite crossarm replacement, and in particular to a live-line replacement device for composite crossarms of power transmission lines. Background Technology

[0002] Transmission towers are one of the most important components of overhead transmission lines. With the development of power grid construction and composite material technology and manufacturing processes, composite crossarms have begun to replace the original steel crossarms of transmission line towers. During the long-term use of composite crossarms, it is necessary to conduct regular inspections and maintenance to ensure the reliability of power supply in transmission lines. When the insulation or mechanical properties of the composite crossarm no longer meet the requirements due to defects, it should be replaced. Existing technology requires power outages during the replacement of composite crossarms, which affects the normal transmission of electricity. At the same time, there is a lack of dedicated working equipment, making the replacement of crossarms difficult. Therefore, a live-line replacement device for transmission line composite crossarms is provided to assist in the replacement of crossarms. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract and title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0005] Therefore, the present invention aims to solve the technical problem of the high operational difficulty in replacing existing crossarms.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a live-line replacement device for a composite crossarm of a transmission line, comprising a support mechanism, including a frame, a screw located at the front end of the frame, a lifting plate located at the upper part of the frame, a fixed roller located inside the frame, a movable roller located at the rear end of the frame, and an adjustment control unit located inside the frame;

[0007] An upper adjustment mechanism includes an upper rotating rod, the outer periphery of which is provided with an upper protruding ridge. One end of the upper rotating rod is provided with an upper positioning block, which is fixed to the outer wall of the frame. The other end of the upper rotating rod is provided with an upper locking sleeve. The inner wall of the upper locking sleeve is provided with an upper rotating handle. An upper limit plate is provided on the outer side of the upper rotating handle. An upper control rod is provided on the surface of the upper limit plate. An upper abutment block is provided at the end of the upper control rod.

[0008] The lower adjustment mechanism includes a lower rotating rod, the lower rotating rod having a lower protruding ridge on its periphery, a lower positioning block at one end of the lower rotating rod and fixed to the outer wall of the frame, a lower locking sleeve at the other end of the lower rotating rod, a lower rotating handle on the inner wall of the lower locking sleeve, a lower limiting piece on the outer side of the lower rotating handle, a lower control rod on the surface of the lower limiting piece, and a lower abutment block at the end of the lower control rod.

[0009] The fixed roller includes a fixed frame fixed to the front of the inner side of the frame, and a first movable sleeve is provided on the outside of the fixed frame;

[0010] The movable roller includes a movable rod disposed inside the frame, a connecting frame disposed at the bottom of the movable rod, a second movable sleeve disposed on the outside of both the movable rod and the connecting frame, and a guide block disposed on the outside of the connecting frame;

[0011] The adjustment control includes a cavity inside the frame, a rotating rod inside the cavity, a lever outside the rotating rod, and a spring on the bottom surface of the lever.

[0012] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, a sliding groove is provided on one side of the inner wall of the frame, and a guide groove is provided on the side of the inner wall of the frame away from the sliding groove.

[0013] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, the hoisting plate includes a protruding plate fixed to the top of the frame, and an anti-overturning plate is provided on the outer side of the protruding plate.

[0014] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, the surface of the convex plate is provided with a circular hole.

[0015] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, the fixing frame is arranged in a U-shape, and the upper and lower crossarms of the fixing frame are movably sleeved with first movable sleeves.

[0016] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, wherein: the lever and the rotating rod are rotatably connected, and the lever is arranged in a horizontal array on the rotating rod.

[0017] In a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, springs are fixed at both ends of the bottom surface of the lever, and the bottom end of the spring is in contact with the bottom surface of the cavity.

[0018] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, wherein: the upper convex rib and the lower convex rib are arranged in the same direction, and the upper convex rib and the lower convex rib are respectively arranged in a spiral shape around the upper rotating rod and the lower rotating rod.

[0019] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, wherein the lever and the upper rotating rod form a linkage structure through the upper protruding ridge.

[0020] As a preferred embodiment of the live-line replacement device for composite crossarms of transmission lines according to the present invention, the outer surfaces of the upper locking sleeve and the lower locking sleeve are both inclined along their spiral direction, and the inclination directions of the outer surfaces of the upper locking sleeve and the lower locking sleeve are opposite.

[0021] The beneficial effects of this invention are: the device has a simple structure and is easy to install and operate. Operators can replace the composite crossarm while at ground potential. The weight of the wires attached to the composite crossarm to be replaced can be transferred to the upper composite crossarm or ground crossarm, which facilitates the subsequent disassembly and assembly of the entire or individual composite crossarms.

[0022] Meanwhile, through the coordinated operation of the movable roller, adjustment control, upper adjustment mechanism and lower adjustment mechanism, users can flexibly adjust the position of the movable roller 105 according to different work needs, reducing the limitations of the replacement device and meeting the user's needs under different work conditions. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 A schematic diagram of the overall structure of the live-line replacement device for a composite crossarm of a transmission line according to an embodiment of the present invention is provided.

[0025] Figure 2 This is a schematic diagram of the support mechanism in a live-line replacement device for a composite crossarm of a transmission line according to an embodiment of the present invention;

[0026] Figure 3 This is a vertical cross-sectional structural diagram of a live-line replacement device for a composite crossarm of a transmission line according to an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the horizontal cross-section of the live-line replacement device for a composite crossarm of a transmission line according to an embodiment of the present invention;

[0028] Figure 5 The live-line replacement device for composite crossarms of transmission lines provided in one embodiment of the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0029] Figure 6 This is a schematic diagram of the upper adjustment mechanism in a live-line replacement device for a composite crossarm of a transmission line according to an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram of the lower adjustment mechanism in a live-line replacement device for a composite crossarm of a transmission line, provided by an embodiment of the present invention. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0034] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0035] Example 1

[0036] Reference Figure 1-5 This embodiment provides a live-line replacement device for composite crossarms of power transmission lines.

[0037] The live-line replacement device for composite crossarms of transmission lines includes a support mechanism 100.

[0038] Specifically, the support mechanism 100 includes a U-shaped frame 101. Two screws 102 are fixedly installed vertically at the front axis of the frame 101. A lifting plate 103 is fixedly installed at the upper front of the frame 101. The lifting plate 103 includes a protruding plate 103a fixed to the top of the frame 101. A circular hole is provided on the surface of the protruding plate 103a. An anti-tilting plate 103b is horizontally installed on the outer side of the protruding plate 103a. The anti-tilting plate 103b is tangent to the bottom of the circular hole. Fixed rollers 104 are fixedly installed at the front inner sides of the two arms of the frame 101. Movable rollers 105 are fixedly installed at the rear inner sides of the two arms of the frame 101. The fixed rollers 104 and the movable rollers 105 are set at the same height.

[0039] Furthermore, the fixed roller 104 includes a fixed frame 104a fixed to the front of the inner side of the frame 101 and arranged in a U-shape, and the upper and lower crossbars of the fixed frame 104a are movably sleeved with first movable sleeves 104b.

[0040] The movable roller 105 includes a movable rod 105a fixedly installed inside the frame 101. A connecting frame 105b is also fixed at the bottom of the movable rod 105a. A second movable sleeve 105c is movably sleeved on the outside of both the movable rod 105a and the connecting frame 105b. Guide blocks 105d are provided on both outer walls of the connecting frame 105b.

[0041] The first movable sleeve 104b and the second movable sleeve 105c are rotatably connected to the fixed frame 104a, the movable rod 105a and the connecting frame 105b respectively, so that when the composite crossarm is replaced, the fixed roller 104 and the movable roller 105 can function as a pulley block to guide the insulating rope, so as to ensure that the insulating rope can smoothly transfer the wire load on the crossarm, so as to facilitate the replacement of the crossarm.

[0042] When replacing a crossarm, the operator is positioned at the end of the crossarm tower above the composite crossarm to be replaced. First, the operator uses an insulated operating rod to insert horizontally into the round hole of the lifting plate 103 above the frame 101, and sends the device to the hardware plate at the head of the composite crossarm, allowing the screw 102 to pass through the fixing point. The operator then uses an electric wrench to tighten the nut to fix the replacement device to the hardware plate. Subsequently, depending on the need, the operator passes an insulated rope with a hook through the fixed roller 104 or the movable roller 105. That is, when replacing a shorter crossarm, the fixed roller 104 located at the inner front end can be selected, and when replacing a longer crossarm, the movable roller 105 located at the outer rear end can be selected. Then, the operator lowers the insulated rope so that the hook is close to the wire attached to the crossarm to be replaced below, and uses the operating rod to hook the wire with the hook. At this point, tighten and secure the insulating rope, allowing the weight of the conductor to be borne by the insulating rope, the replacement device, and the adjacent composite crossarm above. The composite crossarm to be replaced is no longer under the weight of the conductor, and can then be removed and replaced. This device has a simple structure and is easy to install and operate. Operators can complete the replacement of the composite crossarm while at ground potential. It can also transfer the weight of the conductor attached to the composite crossarm to be replaced to the upper composite crossarm or ground crossarm, facilitating the subsequent removal and assembly of the entire or individual composite crossarms. This expands the methods for live maintenance of composite crossarms, promotes the use of composite crossarms, greatly reduces power outage time and frequency, improves power supply reliability, and has significant social and economic benefits.

[0043] Example 2

[0044] Reference Figure 1-7 This is the second embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:

[0045] The live-line replacement device for the composite crossarm of the transmission line also includes a slide groove 101a on one inner wall of the frame 101, a guide groove 101b below the slide groove 101a, a movable roller 105 connected to the frame 101, an adjustment control 106 inside the frame 101, an upper adjustment mechanism 200, and a lower adjustment mechanism 300.

[0046] Specifically, the adjustment control 106 includes a cavity 106a left inside the frame 101. Two round rods 106b are symmetrically arranged inside the cavity 106a. A lever 106c is movably mounted on the outside of each round rod 106b. Springs 106d are fixedly connected to both ends of the bottom surface of the lever 106c. At the same time, the bottom end of the spring 106d is fixed to the bottom surface of the cavity 106a.

[0047] The upper adjustment mechanism 200 includes a horizontally arranged upper rotating rod 201. The outer periphery of the upper rotating rod 201 is integrally provided with a spiral upper protrusion 202. One end of the upper rotating rod 201 is movably connected to an upper positioning block 203, and the upper positioning block 203 is fixed to the outer wall of the frame 101. The other end of the upper rotating rod 201 is fixedly sleeved with an upper locking sleeve 204. The inner wall of the upper locking sleeve 204 is fixedly connected to an upper rotating handle 205 arranged coaxially. The outer side of the upper rotating handle 205 is movably sleeved with an upper limit plate 206, and the upper limit plate 206 is also fixed to the outer side of the frame 101. The surface of the upper limit plate 206 is penetrated by an upper control rod 207, and the outer side of the upper control rod 207 is threaded. The end of the upper control rod 207 is also equipped with an upper abutment block 208.

[0048] The lower adjustment mechanism 300 includes a lower rotating rod 301 arranged parallel to the upper rotating rod 201. A spiral lower protrusion 302 is fixedly provided on the periphery of the lower rotating rod 301. A lower positioning block 303 is movably sleeved on one end of the lower rotating rod 301, and a lower locking sleeve 304 is fixedly sleeved on the other end of the lower rotating rod 301. A lower handle 305 is coaxially fixed on the inner wall of the lower locking sleeve 304. A lower limit piece 306 is movably connected to the outer side of the lower handle 305. Both the lower limit piece 306 and the lower positioning block 303 are fixed to the lower outer wall of the frame 101. A lower control rod 307 also penetrates the surface of the lower limit piece 306. The lower control rod 307 is also threaded on the outside. A lower abutment block 308 is installed at the end of the lower control rod 307.

[0049] Furthermore, the slide groove 101a is T-shaped and can cooperate with the left end of the movable rod 105a to ensure the smooth movement of the movable rod 105a during the position adjustment process. At the same time, the guide groove 101b can cooperate with the guide block 105d to limit the movement of the movable roller 105 as a whole, which can prevent the movable roller 105 from rotating during actual use and affecting its stability.

[0050] Multiple paddles 106c are arranged in a horizontal array on both the upper and lower round rods 106b. At the same time, the paddles 106c and the round rods 106b are connected by the elastic support of springs 106d at both ends of the bottom surface of the paddles 106c to form an elastic rotation structure. This allows the paddles 106c to quickly return to a horizontal state under the elastic force of the springs 106d after rotation, ensuring the normal use of the paddles 106c.

[0051] Both the upper convex rib 202 and the lower convex rib 302 are arranged in the same spiral direction. At the same time, the outer edge of the paddle 106c extends to the outside of the cavity 106a and is located on the rotation path of the upper convex rib 202 and the lower convex rib 302. That is, when the upper rotating rod 201 and the upper convex rib 202 rotate clockwise, they can drive the upper paddle 106c to rotate downward in sequence. The upper paddle 106c pushes or clamps the movable rod 105a from the upper right side. At the same time, when the lower rotating rod 301 and the lower convex rib 302 rotate counterclockwise, they can drive the lower paddle 106c to flip upward in sequence. The lower paddle 106c pushes or clamps the movable rod from the lower left side.

[0052] In practical use, when the position of the movable roller 105 does not match the position of the crossarm to be replaced, the upper rotating rod 201 and the lower rotating rod 301 can be rotated respectively. Before the two rotating rods are rotated, the starting ends of the two protrusions are respectively located at the upper right end of the upper layer paddle 106c and the lower left end of the lower layer paddle 106c. By rotating the lower rotating rod counterclockwise, the lower protrusion 302 is rotated and advanced from left to right in a spiral direction. Then, the lower protrusion 302 pushes the lower layer paddle 106c in contact with it to rotate upward in sequence. Then, the paddle 106c pushes the movable rod 105a to move horizontally, so as to adjust the position of the movable roller 105. After the position adjustment is completed, rotate the lower control rod 307 so that the lower abutment 308 abuts against the surface of the lower locking sleeve 304 to limit and fix the lower rotating rod 301. Then, the user can rotate the upper rotating rod 201 clockwise, and the upper protrusion 202 pushes the upper layer paddle 106c to rotate downward from right to left until... After the adjacent upper-layer paddle 106c on the right side of the movable rod 105a flips downward and contacts the surface of the movable rod 105a, the upper control rod 207 limits the upper rotating rod 201. At this time, the lower-layer paddle 106c on the left side of the movable rod 105a and the upper-layer paddle 106c on the right side work together to clamp and limit the movable rod 105a, ensuring the stability of the movable roller 105 during operation. At the same time, the user can rotate the lower rotating rod 301 clockwise and the upper rotating rod 201 counterclockwise to return the outer protrusions of both to their initial positions. At this time, the paddle 106c is in a horizontal state under the traction of the spring 106d, which facilitates the user to readjust the position of the movable roller 105. Through the linkage between the movable roller 105, the adjustment control 106, the upper adjustment mechanism 200 and the lower adjustment mechanism 300, the user can flexibly adjust the position of the movable roller 105 according to different operating needs, reducing the limitations of the replacement device.

[0053] Example 3

[0054] Reference Figure 1-7 This is the third embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:

[0055] The outer surfaces of both the upper locking sleeve 204 and the lower locking sleeve 304 are inclined along their spiral direction, and the inclination directions of the outer surfaces of the upper locking sleeve 204 and the lower locking sleeve 304 are opposite.

[0056] Specifically, the upper locking sleeve 204 is set with a clockwise spiral slope, which is matched with the rotation direction of the upper rotating rod 201. While not affecting the normal rotation of the upper rotating rod 201, it can limit the upper rotating rod 201 in the counterclockwise direction, so as to prevent the upper rotating rod 201 from rotating counterclockwise under the thrust of the paddle 106c, which would cause the movable roller 105 to loosen.

[0057] Similarly, the lower locking sleeve 304 is designed with a counterclockwise spiral slope, which can limit the rotation rod in the clockwise direction and also prevent the lower rotating rod 301 from rotating clockwise and causing the movable roller 105 to loosen.

[0058] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0059] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0060] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A live-line replacement device for a composite crossarm of a transmission line, characterized in that: include, The support mechanism (100) includes a frame (101), a screw (102) located at the front end of the frame (101), a lifting plate (103) located on the upper part of the frame (101), a fixed roller (104) located inside the frame (101), a movable roller (105) located at the rear end of the frame (101), and an adjustment control (106) located inside the frame (101). The upper adjustment mechanism (200) includes an upper rotating rod (201), with an upper protruding ridge (202) on the periphery of the upper rotating rod (201). One end of the upper rotating rod (201) is provided with an upper positioning block (203), which is fixed to the outer wall of the frame (101). The other end of the upper rotating rod (201) is provided with an upper locking sleeve (204). The inner wall of the upper locking sleeve (204) is provided with an upper rotating handle (205). The outer side of the upper rotating handle (205) is provided with an upper limit plate (206). The surface of the upper limit plate (206) is provided with an upper control rod (207), and the end of the upper control rod (207) is provided with an upper abutment block (208). The lower adjustment mechanism (300) includes a lower rotating rod (301), a lower protruding ridge (302) is provided on the periphery of the lower rotating rod (301), a lower positioning block (303) is provided at one end of the lower rotating rod (301) and the lower positioning block (303) is fixed to the outer wall of the frame (101), a lower locking sleeve (304) is provided at the other end of the lower rotating rod (301), a lower rotating handle (305) is provided on the inner wall of the lower locking sleeve (304), a lower limiting piece (306) is provided on the outer side of the lower rotating handle (305), a lower control rod (307) is provided on the surface of the lower limiting piece (306), and a lower abutment block (308) is provided at the end of the lower control rod (307). The fixed roller (104) includes a fixed frame (104a) fixed to the front inner side of the frame (101), and a first movable sleeve (104b) is provided on the outside of the fixed frame (104a). The movable roller (105) includes a movable rod (105a) disposed inside the frame (101), a connecting frame (105b) disposed at the bottom of the movable rod (105a), a second movable sleeve (105c) disposed on the outside of both the movable rod (105a) and the connecting frame (105b), and a guide block (105d) disposed on the outside of the connecting frame (105b). The adjustment control (106) includes a cavity (106a) left inside the frame (101), a round rod (106b) is provided inside the cavity (106a), a paddle (106c) is provided outside the round rod (106b), and a spring (106d) is provided on the bottom surface of the paddle (106c).

2. The live-line replacement device for composite crossarms of transmission lines according to claim 1, characterized in that: A sliding groove (101a) is provided on one side of the inner wall of the frame (101), and a guide groove (101b) is provided on the side of the frame (101) away from the sliding groove (101a).

3. The live-line replacement device for composite crossarms of transmission lines according to claim 1 or 2, characterized in that: The hoisting plate (103) includes a protruding plate (103a) fixed to the top of the frame (101), and an anti-tilting plate (103b) is provided on the outside of the protruding plate (103a).

4. The live-line replacement device for composite crossarms of transmission lines according to claim 3, characterized in that: The surface of the convex plate (103a) has a circular hole.

5. The live-line replacement device for composite crossarms of transmission lines according to claim 4, characterized in that: The fixing frame (104a) is arranged in a U-shape, and the upper and lower crossbars of the fixing frame (104a) are movably sleeved with first movable sleeves (104b).

6. The live-line replacement device for composite crossarms of transmission lines according to claim 5, characterized in that: The paddle (106c) and the round rod (106b) are rotatably connected, and the paddle (106c) is arranged in a horizontal array on the round rod (106b).

7. The live-line replacement device for composite crossarms of transmission lines according to claim 6, characterized in that: Springs (106d) are fixed at both ends of the bottom surface of the lever (106c), and the bottom end of the spring (106d) is in contact with the bottom surface of the cavity (106a).

8. The live-line replacement device for composite crossarms of transmission lines according to claim 7, characterized in that: The upper convex ridge (202) and the lower convex ridge (302) are arranged in the same direction, and the upper convex ridge (202) and the lower convex ridge (302) are arranged in a spiral shape around the upper rotating rod (201) and the lower rotating rod (301), respectively.

9. The live-line replacement device for composite crossarms of transmission lines according to claim 6 or 7, characterized in that: The paddle (106c) and the upper rotating rod (201) form a linkage structure through the upper protruding ridge (202).

10. The live-line replacement device for composite crossarms of transmission lines according to claim 9, characterized in that: The outer surfaces of the upper locking sleeve (204) and the lower locking sleeve (304) are both inclined along their spiral direction, and the inclination directions of the outer surfaces of the upper locking sleeve (204) and the lower locking sleeve (304) are opposite.

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