Grabbing hook type light yoke plate fixture capable of replacing double strings of insulators at one time

Abstract

The utility model belongs to the technical field of fixtures, and particularly relates to a grapnel type light yoke plate fixture capable of replacing a double-string insulator at one time, which comprises a grapnel section connecting piece and a hanging ring section connecting piece, the hanging ring section connecting piece is used for being matched with a chain block for use, the hanging ring section connecting piece comprises a steel pull ring, and the grapnel section connecting piece comprises two aluminum pull plates; and the grab hook section connecting piece and the hanging ring section connecting piece are connected through the bolt. According to the utility model, needs under different conditions can be met only by using in pairs, connection is simple and convenient, installation can be easily completed by only one person, specific operation implementation is realized, an operator is prevented from repeatedly outputting wires to connect various construction appliances, and the working efficiency is improved. And the number of times of hand cranking during wire tightening is reduced from the previous number of more than 50 to the current number of not more than five, so that the operation difficulty and the labor intensity are greatly reduced, and the total working time is shortened.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to a hook-type lightweight connecting plate clamp for one-time replacement of double-string insulators. Background Technology

[0002] Insulators play a crucial role in the electrical insulation and mechanical fixation of conductors in transmission lines. Double-string insulators are commonly found on straight-line or tension towers at voltage levels of 110kV and above. However, due to the long-term electrical and mechanical loads and adverse factors such as weather, smoke, and dust that overhead transmission lines bear, the aging and damage of insulators are accelerated. Regularly replacing substandard insulators to ensure the safe and reliable operation of the lines is one of the main tasks of annual maintenance work for transmission line maintenance professionals.

[0003] Furthermore, tension towers play a crucial role in transmission lines, bearing not only the vertical load of the conductors but also their longitudinal tension. With the improvement in the mechanical load-bearing capacity and structural stability of composite insulators, double-string composite insulators are now widely used in tension sections of 110kV lines. However, the service life of composite insulators is far shorter than that of porcelain or glass insulators, typically requiring replacement every 15 years or so to ensure that the tensile strength, fatigue fracture resistance, and electrical insulation performance of the insulator strings meet the needs of reliable power transmission. Unlike replacing straight insulator strings, tension insulator strings require numerous connecting hardware. Using traditional clamps or bottle holders results in complex assembly, heavy components, and inconvenient operation. Currently, the commonly used method of replacing conductor-side insulators using a tensioner and chain hoist places the stress point on the conductor side. When installing the tensioner, the operator needs to step out a distance in front of the conductor crimping pipe (the crimping pipe should not be stressed). For double-split conductors, the operator may even need to step out of the conductor twice, resulting in long working time and high physical exertion. Moreover, it increases conductor stress. When tightening the hand-operated hoist, the distance between the tensioner's fixing point and the insulator's release point at the conductor end is relatively far, causing a large deflection angle of the conductor and increasing conductor stress accordingly. Due to the large distance between the stress points on the conductor side and the crossarm side, coupled with the gaps in the tension insulator string due to its own weight-bearing sag and the gaps in the hardware connections, replacing double-string tension composite insulators involves a small working space, high work intensity, and high risk, and the functions of the tools used in the operation are mutually restrictive.

[0004] Therefore, it is essential to develop a new type of tension double-string insulator clamp that is structurally universal, lightweight, easy to use, and flexibly adjustable to solve the current thorny problem. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art by proposing a lightweight hook-type connecting plate clamp for one-time replacement of double-string insulators.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A lightweight, hook-type clamp for replacing two strings of insulators in one operation, including:

[0008] Hook section connector and loop section connector; the loop section connector is used in conjunction with a chain hoist.

[0009] The hanging ring section connector includes a steel pull ring, and the hook section connector includes two aluminum pull plates;

[0010] Bolts are used to connect the hook section connector and the hanging ring section connector.

[0011] Preferably, the steel pull ring is provided with an elliptical hole.

[0012] Preferably, the aluminum plate has a circular hole.

[0013] Preferably, the opening angle between the two aluminum plates is in the range of 0-120°.

[0014] Preferably, the overall shape of the hook section connector and the hanging ring section connector is "Y".

[0015] Preferably, the steel pull ring is provided with a connecting hole for engaging with a bolt.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] After the clamp test passed, a simulated power outage was conducted at the training base to replace double-string insulators with hydraulic tension clamps on a 110kV line. The entire process took 45 minutes, and the results met expectations, significantly improving maintenance efficiency and safety. Compared to the previously commonly used traditional tensioner and chain hoist method, the new double-string insulator clamp brought two significant improvements.

[0018] Effect 1: Traditional methods require different specifications of wire clamps for different wire diameters, and the crossarm end requires the use of gate-type clamps or wire sleeves to match the corresponding specifications of shackles, depending on the actual situation. However, the new clamps can be used in pairs to meet the needs of different situations, and the connection is simple and convenient.

[0019] Effect 2: The new clamp can be easily installed by just one person, enabling the actual operation. It avoids the need for workers to repeatedly extend wires to connect various construction tools, and the number of times the hand-cranked hoist is used to tighten the wire has been reduced from at least fifty times to no more than five times. This greatly reduces the difficulty and labor intensity of operation, and shortens the overall working time.

[0020] Subsequently, during spring and autumn maintenance work, the transmission line operation and maintenance center's maintenance teams successively deployed the clamps at construction sites on lines such as Caodong Line 1 & 2, Nieli Line 1, Jinghu Line, Caoshang Line 1, Luomeng Line 1 & 2, and Nongxiao Line. The clamps performed well, effectively shortening the distance between the front and rear fixed stress points, reducing the number of construction tools used, simplifying the work steps, reducing the number of workers, and effectively shortening the work time. Compared with previous insulator replacement tools, the work is more convenient, significantly reducing the intensity and difficulty of maintenance work. In actual work, the clamps demonstrate strong safety and stability, meeting the needs of replacing double-string composite hydraulic tension clamps on 35kV-110kV lines during power outages. Multiple operational verifications have confirmed that the clamps met the actual requirements of the lines and achieved the expected goals. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the grab-hook type lightweight connecting plate clamp for one-time replacement of double-string insulators proposed in this utility model;

[0022] Figure 2 This is a front view of the lightweight grab-hook type connecting plate clamp for one-time replacement of double-string insulators proposed in this utility model.

[0023] Figure 3 This is a side view of the lightweight grab-hook type connecting plate clamp for one-time replacement of double-string insulators proposed in this utility model.

[0024] In the picture: 1. Steel pull ring; 2. Aluminum pull plate. Detailed Implementation

[0025] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this embodiment, and not all embodiments.

[0026] Example 1

[0027] Reference Figures 1-3 A lightweight, hook-type clamp for replacing double-string insulators in one operation, including:

[0028] Hook section connector and loop section connector; the loop section connector is used in conjunction with a chain hoist.

[0029] The hanging ring section connector includes a steel pull ring 1, and the hook section connector includes two aluminum pull plates 2. The steel material is 2Cr13, and the aluminum alloy material is 2A12.

[0030] Bolts are used to connect the hook section connector and the hanging ring section connector.

[0031] In this embodiment, the steel pull ring 1 is provided with an elliptical hole.

[0032] In this embodiment, the aluminum plate 2 is provided with a circular hole.

[0033] In this embodiment, the opening and closing angle between the two aluminum plates 2 is in the range of 0-120°.

[0034] In this embodiment, the overall shape of the hook section connector and the hanging ring section connector is "Y".

[0035] In this embodiment, the steel pull ring 1 is provided with a connecting hole for mating with a bolt.

[0036] In this embodiment, the clamp is designed with a "Y"-shaped structure, possessing excellent load-bearing capacity and stability. It includes a hook section connector and a hanging ring section connector. The connection between the connectors is stable and reliable. The hook section connector acts directly on the connecting plate and has a certain degree of adaptability. The hanging ring section connector is used in conjunction with a chain hoist, which can significantly shorten the distance between the front and rear fixed force points, reduce the number of construction tools used and the connection sag, thereby greatly reducing the intensity and difficulty of maintenance construction and improving the efficiency of maintenance work. It is a universal, lightweight, easy-to-use, and flexibly adjustable clamp for replacing double-string insulators. There are slots and openings between the connectors, which are connected by bolts to ensure that the components are reliably and firmly connected. The movable hook is flexible and convenient, acting on the pre-reserved maintenance hole in the connecting plate, and is compatible with multiple types of connecting plates. All parts of the clamp are connected by bolts. The bolt strength should meet the maintenance construction requirements, and the fixed connection force bolts should have anti-dislodgement devices to ensure that the connection between each connector is stable and reliable. The overall load-bearing capacity of the clamp is qualified. Improve existing Φ14 manganese steel bolts and existing Φ16 bolts as clamp connecting bolts to ensure that they are compatible with the connecting plate while meeting the strength requirements.

[0037] When replacing double-string composite insulators on 110kV lines during power outages, especially on tension towers, the safety of workers is greatly improved, the operation time is effectively shortened, the operating cost is reduced, and the level of transmission line maintenance is enhanced.

[0038] According to the relevant requirements of standards such as DL / T 463-2006—Insulator Clamps for Live Working and DL 5009.2-2013—Safety Work Regulations for Power Construction Part 2: Line Section, regarding the technical requirements and test methods for replacing insulator clamps, the static test load of the clamps shall not be less than 60kN. A static load test was conducted by applying 1.25 times the rated load of the clamp (60kN) for 10 minutes. The test results showed that the sample was in good condition, without deformation or breakage, and the test results were qualified.

[0039] Specific operating procedures: Workers use a horizontal ladder to reach a suitable position, install anti-drop protection devices, install clamps at the connecting plates on both sides of the insulator string, and hook the hooks at both ends of the hoist into the hanging rings of the front and rear clamps respectively. Then, tighten the chain hoist to facilitate the disassembly and replacement of the old insulator. Subsequently, ground staff cooperate with high-altitude workers to disassemble the old insulator and install the new insulator. Then, the chain hoist is loosened, the insulator string regains its load-bearing capacity, and high-altitude workers disassemble the construction tools and insulator clamps to complete the replacement of the double-string insulator.

[0040] This solution, using a conductor-side tensioner in conjunction with a chain hoist for insulator replacement, requires two workers at height. The conductor and crossarm sides also require more clamps and connecting hardware to transfer the load and replace the insulators. However, using a hook-type lightweight clamp for one-time replacement of double-string insulators allows even one worker at height to complete the replacement, with simple and convenient connections. This significantly reduces labor and material costs. Most importantly, when using this clamp for replacing double-string hydraulic tension clamps on 110kV lines during power outages, it effectively shortens the operation time. During spring / autumn maintenance, the second maintenance team successively deployed the clamp at construction sites on the Caodong 1 & 2 lines, Nieli 1 line, Jinghu line, Caoshang 1 line, Luomeng 1 & 2 lines, and Nongxiao lines. Data from nine double-string insulator replacements were analyzed, revealing a reduction of 31.7 minutes compared to previous methods. This significantly reduces maintenance time costs, shortens line outage time, ensures power supply, and promotes socio-economic development, demonstrating significant economic benefits.

[0041] Using lightweight hook-type clamps for replacing double-string insulators with hydraulic tension clamps on 110kV lines during power outages significantly reduces the workload of workers, improves work efficiency, and enhances operational safety. Overhead lines are a crucial component of power transmission. Ensuring high-quality and efficient completion of various maintenance tasks guarantees a robust power transmission channel, lays a solid foundation for reliable power supply, continuously improves users' access to electricity, generates positive social benefits, and establishes a positive corporate image.

[0042] Example 2

[0043] The difference from Embodiment 1 is that the overall shape of the hook section connector and the hanging ring section connector is "△".

[0044] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A lightweight, hook-type connecting plate clamp for one-time replacement of double-string insulators, characterized in that: include: Hook section connector and loop section connector; the loop section connector is used in conjunction with a chain hoist. The hanging ring section connector includes a steel pull ring (1), and the hook section connector includes two aluminum pull plates (2); Bolts are used to connect the hook section connector and the hanging ring section connector.

2. The grab-hook type lightweight connecting plate clamp for one-time replacement of double-string insulators according to claim 1, characterized in that, The steel pull ring (1) is provided with an elliptical hole.

3. The grab-hook type lightweight connecting plate clamp for one-time replacement of double-string insulators according to claim 2, characterized in that, The aluminum sheet (2) has a circular hole.

4. The grab-type lightweight connecting plate clamp for one-time replacement of double-string insulators according to claim 3, characterized in that, The opening and closing angle between the two aluminum plates (2) is 0-120°.

5. The grab-hook type lightweight connecting plate clamp for one-time replacement of double-string insulators according to claim 4, characterized in that, The overall shape of the hook section connector and the hanging ring section connector is "Y".

6. The grab-hook type lightweight connecting plate clamp for one-time replacement of double-string insulators according to claim 5, characterized in that, The steel pull ring (1) is provided with a connecting hole for use with a bolt.

Images