Auxiliary insulator lifting device
By designing an insulator auxiliary lifting device including connecting pipes, insulator handles, insulator ball head self-locker, hooks and hanging rings, the problem of difficulty for high-altitude workers in the replacement of insulators in high-voltage transmission lines is solved, and more efficient and safe insulator replacement is achieved.
Patent Information
- Application Number
- CN202510322610.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2025-05-13
AI Technical Summary
In high-voltage transmission lines, due to the large mass of single-chip insulators, it is very difficult for high-altitude workers to pull and lift the insulators during the replacement process, resulting in unsafe and inefficient replacement process.
An insulator auxiliary lifting device is designed, including a connecting pipe, an insulator handle, an insulator ball head self-locker, a hook and a hanging ring. The insulator to be replaced is rotated directly above by rotating the connecting pipe, simplifying the operation of high-altitude workers.
This device enables high-altitude workers to complete the insulator pick-up and placement work in a more comfortable posture, reducing the difficulty of pick-up and placement, and improving work efficiency and safety.
Smart Images
Figure CN119994716A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of electric power maintenance, and more particularly to an insulator auxiliary lifting device. Background Art
[0002] With the development of long-distance transmission technologies such as ultra-high voltage and ultra-high voltage, voltage levels continue to increase, and the requirements for insulation strength and mechanical strength of lines and towers are becoming higher and higher. Therefore, the volume and mass of insulators continue to increase.
[0003] However, as the line runs longer, monolithic insulators will have problems such as low zero value, degradation, and self-explosion, and they need to be replaced regularly. Usually, the insulator is lifted to the pulley using a pull rope, and then the insulator is removed from the thigh by bypassing the insulator string. The monolithic insulators used in UHV transmission are much heavier than insulators of other voltage levels, so it is very difficult for high-altitude workers to pull and lift the insulators during the replacement process.
[0004] In summary, how to safely and conveniently complete the lifting of insulators is a problem that currently needs to be solved urgently by those skilled in the art. Summary of the invention
[0005] In view of this, the purpose of the present invention is to provide an insulator auxiliary lifting device, which can rotate the insulator to the top of the connecting pipe for picking and placing, so that high-altitude workers can complete the picking and placing work in a more comfortable body posture, reducing the difficulty of picking and placing, and improving work efficiency and work safety.
[0006] In order to achieve the above object, the present invention provides the following technical solutions:
[0007] An insulator auxiliary lifting device comprises a connecting pipe, one end of which is provided with an insulating handle, the other end of which is provided with an insulator ball head self-locking device for connecting with the insulator, and the middle part of the connecting pipe is provided with a hook for connecting with an insulator string and a hanging ring for connecting with a pulley rope.
[0008] Preferably, the insulating handle is detachably connected to the connecting pipe via a handle joint, the hook is sleeved on the outside of the connecting pipe via an annular fixing bracket, and the annular fixing bracket is connected to the connecting pipe via a fastener.
[0009] Preferably, the hook comprises an arc-shaped hook and a connecting belt, the connecting belt and the arc-shaped hook are respectively arranged at two ends of the annular fixing bracket, and the connecting belt and the arc-shaped hook are detachably connected.
[0010] Preferably, one end of the connecting belt is clamped in the connecting belt receiving groove of the annular fixing bracket, and the other end of the connecting belt is provided with a limiting portion, and the size of the limiting portion is larger than the size of the connecting belt receiving groove.
[0011] Preferably, the arc-shaped hook is provided with a plurality of rubber rollers for rotation along the extension direction, and the rotating shafts of the rubber rollers are installed in the arc-shaped hook through one-way bearings.
[0012] Preferably, the insulator ball head self-locking device comprises:
[0013] An inner sleeve, the upper end of which is used to connect with the connecting pipe, and the lower part of which is provided with a receiving cavity for accommodating the insulator ball head, and the outer peripheral surface of the receiving cavity is provided with a plurality of radially penetrating through holes, and the steel balls in the through holes are used to limit the downward movement of the insulator ball head;
[0014] An outer sleeve is slidably sleeved outside the inner sleeve, and its lower part can limit the radial movement of the steel ball to prevent the steel ball from falling out;
[0015] A return spring is arranged between the inner sleeve and the outer sleeve. When the outer sleeve slides upward relative to the inner sleeve, the return spring is compressed and the steel ball moves radially outward.
[0016] When the outer sleeve slides downward relative to the inner sleeve, the steel balls move radially inward.
[0017] Preferably, the diameter of the through hole gradually increases from the inside to the outside, and the diameter of the through hole at the inner circumferential surface of the accommodating cavity is smaller than the diameter of the steel ball.
[0018] Preferably, a wedge-shaped limiting surface is provided at the lower portion of the outer sleeve, and a cylindrical limiting surface for blocking the steel ball is provided on the outer side of the wedge-shaped limiting surface.
[0019] Preferably, a positioning step is provided on the outer circumference of the inner sleeve, a positioning step surface is provided on the inner circumference of the outer sleeve, one end of the return spring is connected to the positioning step, and the other end of the return spring is connected to the positioning step surface.
[0020] Preferably, the inner circumferential surface of the inner sleeve is provided with an internal thread, the bottom end of the connecting pipe is provided with an external thread, and the inner sleeve is threadedly connected to the connecting pipe.
[0021] The insulator auxiliary lifting device provided by the present invention can cooperate with a pulley to lift the insulator to be replaced, and connect the insulator string and the connecting pipe through a hook, and then rotate the insulator to be replaced to just above by rotating the connecting pipe. Compared with the traditional method in which high-altitude workers reach down to take and place insulators, high-altitude workers can complete the taking and placing work in a more comfortable body posture, which effectively reduces the difficulty of taking and placing insulators, reduces the work burden, and improves work efficiency and work safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0023] Figure 1 A schematic structural diagram of a specific embodiment of the insulator auxiliary lifting device provided by the present invention;
[0024] Figure 2 for Figure 1 A cross-sectional schematic diagram of
[0025] Figure 3 It is a local enlarged view of area A;
[0026] Figure 4 is a schematic diagram of the structure of the hook;
[0027] Figure 5 It is a local enlarged view of area B;
[0028] Figure 6 It is a local enlarged view of area C;
[0029] Figure 7 This is a working schematic diagram of the insulator auxiliary lifting device;
[0030] Figure 8 Schematic diagram of the force principle of insulator auxiliary lifting.
[0031] Figure 1-Figure 8 middle:
[0032] 01-insulator; 02-pulley; 03-insulator string; 10-insulating handle; 11-handle joint; 20-connecting pipe; 30-hook; 31-annular fixing bracket; 311-connecting belt storage groove; 32-arc hook; 321-rubber roller; 322-rotating shaft; 323-one-way bearing; 324-joint; 33-connecting belt; 40-hanging ring; 50-insulator ball head self-locking device; 51-inner sleeve; 511-steel ball; 52-reset spring; 53-outer sleeve. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0034] The core of the present invention is to provide an insulator auxiliary lifting device, which can rotate the insulator to the top of the connecting pipe for picking and placing, so that high-altitude workers can complete the picking and placing work in a more comfortable body posture, reducing the difficulty of picking and placing, and improving work efficiency and work safety.
[0035] The insulator auxiliary lifting device provided by the present invention comprises a connecting tube 20, one end of which is provided with an insulating handle 10, the other end of which is provided with an insulator ball head self-locking device 50 for connecting with the insulator 01, and the middle part of the connecting tube 20 is provided with a hook 30 for connecting with the insulator string 03 and a hanging ring 40 for connecting with the pulley rope.
[0036] Among them, the insulating handle 10 is used for high-altitude workers to hold, and it is usually made of insulating materials such as plastic to avoid problems such as electric shock, thereby ensuring the personal safety of high-altitude workers; the specific material, structure, shape and size of the insulating handle 10 can be determined according to actual production needs and with reference to existing technologies, so that the insulating handle 10 has good safety and meets ergonomic requirements.
[0037] The connecting tube 20 is mainly used to install other functional structures of the auxiliary lifting device, such as the insulator ball head self-locking device 50 for connecting and fixing the insulator 01, the hanging ring 40 for connecting with the pull rope of the pulley 02 to lift the auxiliary lifting device through the pulley 02, and the hook 30 for connecting with the insulator string 03 to facilitate the removal and placement of the insulator 01 to be replaced.
[0038] The material of the connecting pipe 20 is not limited. In order to reduce the overall mass of the auxiliary lifting device, it is usually set to an aluminum tube. The length of the connecting pipe 20 is determined according to the needs of the actual lifting operation. In order to facilitate operators of different heights to work, it is preferred to set the connecting pipe 20 as a telescopic tube with adjustable length, which can be specifically adjusted in length by at least two layers of mutually nested sliding sleeves.
[0039] In order to facilitate the transportation of the auxiliary lifting device, it is preferred that the insulating handle 10, the hook 30, the hanging ring 40 and the insulator ball head self-locking device 50 are all connected to the connecting pipe 20 by detachable connection methods such as threaded connection, bolt connection, pin connection, etc.
[0040] For example, the insulating handle 10 is detachably connected to the connecting pipe 20 through the handle joint 11, the hook 30 is sleeved on the outside of the connecting pipe 20 through the annular fixing bracket 31, and the annular fixing bracket 31 is connected to the connecting pipe 20 through fasteners such as fastening screws and connecting pins to prevent the annular fixing bracket 31 from sliding or rotating relative to the connecting pipe 20 during the lifting or rotation process.
[0041] The insulator ball head self-locking device 50 is arranged at the bottom end of the connecting tube 20 and is used to connect with the insulator 01. The shape, structure and size of the insulator ball head self-locking device 50 can refer to the existing insulator self-locking device settings according to actual production needs, and will not be repeated here.
[0042] The hook 30 is used to connect with the insulator string 03 so that after the auxiliary lifting device is lifted into place, the position of the insulator 01 can be adjusted by rotating the connecting tube 20 to facilitate the process of taking and placing the insulator 01.
[0043] The specific structure, shape and size of the hook 30 and the ring 40 can be determined according to the actual production needs with reference to the existing technology, and will not be repeated here.
[0044] When in use, the pulley 02 is fixed on the insulator string 03. First, the pull rope of the pulley 02 is connected to the hanging ring 40 of the connecting pipe 20, and the insulator 01 to be replaced is installed in the insulator ball head self-locking device 50; then the pulley 02 is used to lift the auxiliary lifting device and the insulator 01 to be replaced to a position near the insulator string 03, and the aerial workers push the auxiliary lifting device forward along the extension direction of the insulator string 03 to prevent the hook 30 from getting stuck on the pulley 02; after the hook 30 passes the position of the pulley 02, the aerial workers release the auxiliary lifting device to restore the auxiliary lifting device to the position as shown. Figure 7 a; then continue to lift the auxiliary lifting device, so that the hook 30 of the connecting tube 20 abuts against the insulator string 03, hang the hook 30 on the insulator string 03, and then rotate the connecting tube 20 180° until the insulator 01 to be replaced is directly above, as shown in FIG. Figure 7c; unlock the insulator 01 to be replaced and install it to the replacement position, connect the replaced insulator 01 to the insulator ball head self-locking device 50, rotate the connecting tube 20 in the opposite direction to rotate it 180° to a vertical state, then untie the connection between the hook 30 and the insulator string 03, and finally use the pulley 02 to lower the auxiliary lifting device and the replaced insulator 01 to the ground to complete the replacement operation of the insulator 01.
[0045] In this embodiment, the insulator auxiliary lifting device can cooperate with the pulley 02 to lift the insulator 01 to be replaced, and connect the insulator string 03 and the connecting tube 20 through the hook 30, and then rotate the insulator 01 to be replaced to the top by rotating the connecting tube 20. Compared with the traditional method in which high-altitude workers reach down to pick up and place the insulator 01, the high-altitude workers can complete the picking and placing work in a more comfortable body posture, which effectively reduces the difficulty of picking up and placing the insulator 01, which not only reduces the work burden, but also improves the work efficiency and work safety.
[0046] Based on the above embodiment, the structure of the hook 30 is defined. The hook 30 includes an arc-shaped hook 32 and a connecting belt 33. The connecting belt 33 and the arc-shaped hook 32 are respectively arranged at two ends of the annular fixing bracket 31, and the connecting belt 33 and the arc-shaped hook 32 are detachably connected.
[0047] Please refer to Figure 3 A connecting belt 33 is provided on the upper end surface of the annular fixing bracket 31, and an arc-shaped hook 32 is provided on the lower end of the arc-shaped fixing bracket 31. The arc length of the arc-shaped hook 32 and the length of the connecting belt 33 can be determined according to the size of the insulator string 03 in actual production to ensure that the arc-shaped hook 32 and the connecting belt 33 are tightly fitted with the insulator string 03, and to ensure that when the connecting tube 20 is rotated, the hook 30 can be stably and reliably connected to the insulator string 03.
[0048] Among them, the arc hook 32 is mostly hinged to the annular fixed bracket 31 through a rotating shaft, etc., so as to adjust the relative position of the arc hook 32 and the annular fixed bracket 31, thereby enhancing the applicability of the arc hook 32; in order to ensure operational safety, it needs to be explained that the position where the arc hook 32 is used to contact the insulator string 03 needs to be provided with an insulating layer such as rubber.
[0049] For example, Figure 3 As shown, the arc hook 32 is provided with a plurality of rubber rollers 321 for rotation along the extension direction, and the rotating shaft 322 of the rubber roller 321 is installed in the arc hook 32 through a one-way bearing 323. Since the rotating shaft 322 can only rotate in one direction, it is more labor-saving for high-altitude workers.
[0050] Please refer to Figure 8During the rotation process, the contact point between the insulator string 03 and the connecting tube 20 is point O, the pressure exerted by the aerial workers on the auxiliary lifting device is F, the point of action of the pressure F is the insulating handle 10 at the top of the connecting tube 20, and the total gravity of the auxiliary lifting device and the insulator 01 is G. Considering that the masses of the auxiliary lifting device and the insulator 01 are mainly concentrated on the insulator 01, it can be considered that the point of action of the total gravity G is close to the bottom end of the connecting tube 20. When the power arm L1 of the pressure F is greater than the resistance arm L2 of the total gravity G, the connecting tube 20 can be considered as a labor-saving lever;
[0051] When the rotating shaft 322 rotates unidirectionally, the aerial workers can apply pressure F to the insulating handle 10 in a pulsed operation mode to rotate the connecting pipe 20 , which is more labor-saving than applying pressure F to the insulating handle 10 all the time.
[0052] The connecting belt 33 can be fixed to the annular fixing bracket 31 by fastening screws or buckles, and can also be connected to the annular fixing bracket 31 by bonding under the condition that the connection strength permits; but considering the storage problem of the connecting belt 33, usually one end of the connecting belt 33 is clamped in the connecting belt storage groove 311 of the annular fixing bracket 31, and the other end of the connecting belt 33 is provided with a limiting portion, and the size of the limiting portion is larger than the size of the connecting belt storage groove 311.
[0053] When in use, the connecting belt 33 can be pulled out by pulling the limiting portion outward, and when stored or transported, the connecting belt 33 is stored in the connecting belt storage groove 311 to prevent the connecting belt 33 from being cut or worn, thereby extending the service life of the connecting belt 33.
[0054] The connecting belt 33 and the arc-shaped hook 32 are detachably connected, and the joint 324 at the end of the arc-shaped hook 32 can be buckled and connected to the connecting belt 33, or the connecting belt 33 can be tied and fixed on the arc-shaped hook 32.
[0055] On the basis of the above embodiment, the structure of the insulator ball head self-locking device 50 is defined, and the insulator ball head self-locking device 50 includes:
[0056] The inner sleeve 51 has an upper end connected to the connecting tube 20, and a lower portion thereof is provided with a receiving cavity for receiving the insulator ball head, and a plurality of radially penetrating through holes are provided on the outer peripheral surface of the receiving cavity, and the steel balls 511 in the through holes are used to limit the downward movement of the insulator ball head;
[0057] The outer sleeve 53 is slidably mounted on the outer side of the inner sleeve 51, and the lower part of the outer sleeve 53 can limit the radial movement of the steel ball 511 to prevent the steel ball 511 from falling out;
[0058] The return spring 52 is disposed between the inner sleeve 51 and the outer sleeve 53. When the outer sleeve 53 slides upward relative to the inner sleeve 51, the return spring 52 is compressed and the steel ball 511 moves radially outward.
[0059] When the outer sleeve 53 slides downward relative to the inner sleeve 51 , the steel balls 511 move radially inward.
[0060] The inner sleeve 51 is connected to the bottom end of the connecting pipe 20. In order to facilitate the transportation of the auxiliary lifting device, it is preferred to set the two to be detachably connected, that is, the inner circumferential surface of the inner sleeve 51 is provided with an internal thread, and the bottom end of the connecting pipe 20 is provided with an external thread, and the inner sleeve 51 is threadedly connected to the connecting pipe 20;
[0061] Alternatively, the top of the inner sleeve 51 and the bottom of the connecting pipe 20 may both be provided with connecting holes, and the two may be fixedly connected by fastening bolts or connecting pins.
[0062] An outer sleeve 53 is slidably sleeved outside the inner sleeve 51. By changing the relative positions of the inner and outer sleeves, the radial position of the steel ball 511 of the inner sleeve 51 can be changed, thereby achieving locking and unlocking of the insulator ball head.
[0063] The return spring 52 is arranged between the inner and outer sleeves. In order to prevent the inner and outer sleeves from being stuck due to radial relative movement, the return spring 52 needs to be arranged along the axial direction of the inner sleeve 51 to ensure that the inner and outer sleeves can only move relative to each other in the axial direction.
[0064] In order to facilitate the installation of the return spring 52, it is preferred to provide a positioning step on the outer periphery of the inner sleeve 51, and a positioning step surface on the inner periphery of the outer sleeve 53, one end of the return spring 52 is connected to the positioning step, and the other end of the return spring 52 is connected to the positioning step surface.
[0065] Please refer to Figure 3 When the insulator 01 needs to be locked, the ball head of the insulator 01 is placed opposite to the inner sleeve 51 of the insulator ball head self-locking device 50, and then the inner sleeve 51 is pressed down to make the inner sleeve 51 slide downward in the axial direction relative to the outer sleeve 53, and the steel ball 511 moves outward in the radial direction of the inner sleeve 51, so that the insulator ball head is pressed into the accommodating cavity of the inner sleeve 51, and the return spring 52 is compressed at this time;
[0066] Then, the pressure on the inner sleeve 51 is removed. Under the action of the reset spring 52, the inner sleeve 51 slides upward in the axial direction relative to the outer sleeve 53. At the same time, the steel ball 511 moves radially inward along the inner sleeve 51, thereby limiting the axial downward movement of the insulator ball head and separating from the accommodating cavity of the inner sleeve 51, thereby locking the insulator ball head.
[0067] In order to realize the movement of the steel ball 511 radially outward, the height of the lower edge of the through hole gradually decreases from the inner position to the outer position, so that the steel ball 511 can move radially outward under the action of its own weight. The height of the upper edge of the through hole can be kept consistent or set to gradually increase from the inner position to the outer position; however, considering the processing problem of the through hole, the diameter of the through hole is usually set to gradually increase from the inner to the outer side, and the processing of the truncated cone hole is more convenient;
[0068] In order to prevent the steel ball 511 from completely entering the accommodating cavity and disengaging from the through hole under the limiting effect of the outer sleeve 53, it is preferably arranged that the diameter of the through hole at the inner circumference of the accommodating cavity is smaller than the diameter of the steel ball 511, so that the steel ball 511 can only partially protrude from the inner circumference of the accommodating cavity.
[0069] Similarly, in order to limit the steel ball 511 from radially disengaging from the above-mentioned through hole, the lower part of the outer sleeve 53 needs to be provided with a limiting structure, such as a limiting surface, a limiting plate, etc. It is preferred that a wedge-shaped limiting surface is provided at the lower part of the outer sleeve 53. In the self-locking state, the wedge-shaped limiting surface is lower than the upper edge of the through hole, and a cylindrical limiting surface for blocking the steel ball 511 is provided on the outer side of the wedge-shaped limiting surface.
[0070] In this embodiment, the radial position of the steel ball 511 is changed by the relative sliding of the inner and outer sleeves, thereby achieving locking and unlocking of the insulator ball head. The structure is simple and easy to operate. At the same time, the self-locking effect is stable and reliable, and the problem of the insulator 01 being separated from the auxiliary lifting device is not likely to occur.
[0071] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0072] The above is a detailed introduction to the auxiliary lifting device for insulators provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims
1. An insulator auxiliary lifting device, characterized in that: The invention comprises a connecting tube (20), one end of which is provided with an insulating handle (10), the other end of which is provided with an insulator ball head self-locking device (50) for connecting to an insulator (01), and the middle part of the connecting tube (20) is provided with a hook (30) for connecting to an insulator string (03) and a hanging ring (40) for connecting to a pull rope of a pulley (02).
2. The insulator auxiliary lifting device according to claim 1, characterized in that: The insulating handle (10) is detachably connected to the connecting pipe (20) via a handle joint (11); the hook (30) is sleeved on the outside of the connecting pipe (20) via an annular fixing bracket (31); and the annular fixing bracket (31) is connected to the connecting pipe (20) via a fastener.
3. The insulator auxiliary lifting device according to claim 2, characterized in that: The hook (30) comprises an arc-shaped hook (32) and a connecting belt (33); the connecting belt (33) and the arc-shaped hook (32) are respectively arranged at two ends of the annular fixing bracket (31); and the connecting belt (33) and the arc-shaped hook (32) are detachably connected.
4. The insulator auxiliary lifting device according to claim 3, characterized in that: One end of the connecting belt (33) is clamped in a connecting belt receiving groove (311) of the annular fixing bracket (31), and the other end of the connecting belt (33) is provided with a limiting portion, the size of the limiting portion being larger than the size of the connecting belt receiving groove (311).
5. The insulator auxiliary lifting device according to claim 3, characterized in that: The arc-shaped hook (32) is provided with a plurality of rubber rollers (321) for rotation along the extension direction, and the rotating shaft (322) of the rubber roller (321) is installed in the arc-shaped hook (32) via a one-way bearing (323).
6. The insulator auxiliary lifting device according to any one of claims 1 to 5, characterized in that: The insulator ball head self-locking device (50) comprises: An inner sleeve (51), the upper end of which is used to connect to the connecting pipe (20), the lower part of which is provided with a receiving cavity for receiving the insulator ball head, and the outer peripheral surface of the receiving cavity is provided with a plurality of radially penetrating through holes, and the steel balls (511) in the through holes are used to limit the downward movement of the insulator ball head; An outer sleeve (53) is slidably sleeved outside the inner sleeve (51), and a lower portion of the outer sleeve (53) can limit radial movement of the steel ball (511) to prevent the steel ball (511) from falling out; a return spring (52) disposed between the inner sleeve (51) and the outer sleeve (53); when the outer sleeve (53) slides upward relative to the inner sleeve (51), the return spring (52) is compressed and the steel ball (511) moves radially outward; When the outer sleeve (53) slides downward relative to the inner sleeve (51), the steel ball (511) moves radially inward.
7. The insulator auxiliary lifting device according to claim 6, characterized in that: The diameter of the through hole gradually increases from the inside to the outside, and the diameter of the through hole at the inner peripheral surface of the accommodating cavity is smaller than the diameter of the steel ball (511).
8. The insulator auxiliary lifting device according to claim 6, characterized in that: A wedge-shaped limiting surface is provided at the lower portion of the outer sleeve (53), and a cylindrical limiting surface for blocking the steel ball (511) is provided on the outer side of the wedge-shaped limiting surface.
9. The insulator auxiliary lifting device according to claim 6, characterized in that: The outer circumference of the inner sleeve (51) is provided with a positioning step, the inner circumference of the outer sleeve (53) is provided with a positioning step surface, one end of the return spring (52) is connected to the positioning step, and the other end of the return spring (52) is connected to the positioning step surface.
10. The insulator auxiliary lifting device according to claim 6, characterized in that: The inner circumferential surface of the inner sleeve (51) is provided with an internal thread, the bottom end of the connecting pipe (20) is provided with an external thread, and the inner sleeve (51) is threadedly connected to the connecting pipe (20).