CN106329389B - A kind of lifting device of large-tonnage live wire - Google Patents

Abstract

The invention relates to an auxiliary device for live work of a power transmission line, in particular to a lifting device for a large-tonnage live wire. It includes lifting cross arm, leveling bracket, reinforcing device and lifting device. There are two leveling brackets and they are respectively located on both sides of the middle section of the lifting cross arm. The lower part of the leveling bracket is fixed on the angle steel of the iron tower cross arm. The cross-arm is fixedly connected; the reinforcing device is located in the middle of the lifting cross-arm between the two flat brackets, the upper part of the reinforcing device is fixedly connected with the lifting cross-arm, and the lower part is fixedly connected with the angle steel of the iron tower cross-arm; the lifting device is symmetrical It is installed at both ends of the lifting cross arm, and each end is equipped with two lifting devices. The invention adopts a four-point lifting structure to realize the lifting of large-tonnage live wires by using insulating materials with smaller specifications, has backup protection against falling of the lifting wires, and ensures the safety and reliability of large-tonnage live wire lifting operations.

Description

A lifting device for large tonnage live conductors

technical field

The invention relates to an auxiliary device for live work of a power transmission line, in particular to a lifting device for a large-tonnage live wire.

Background technique

In recent years, with the continuous improvement of the power grid structure, the number of 500kV transmission lines has gradually increased. With the improvement of the transmission capacity, the wires are mostly used in multi-split transmission mode, and the wire diameter is also increased simultaneously, which causes the vertical load of the tower to increase. At the same time, the path of the 500kV transmission line generally passes through mountainous areas. Due to the large spanning distance of the towers between the two hills, the span of the wires increases, which further increases the vertical load of the towers. In general, for towers bearing large vertical loads, in order to improve the load-bearing capacity of the insulator strings, the suspension mode of double string insulators is considered in the design. Secondly, the 500kV transmission line also adopts the double-string insulator string suspension method for crossing important facilities, such as highways, railways, high-speed rail, rivers, power lines with voltage levels of 110kV and above, military and important communication lines, etc.

When the insulator string adopts the double-string suspension method, the cross-connection plate connection method is usually set on the conductor side. Generally, the replacement of insulators is carried out in the event of a power failure. The replacement of double-string insulators with power will bring the following problems:

1. Generally, the towers with double-string insulators are used in mountainous areas, and the vertical load is generally large. According to statistics, double-string insulators are used in mountainous areas, and the vertical load can reach 6.5 tons or more. If conventional tools are used for live work, because the tools allow If the load does not meet the lifting requirements, live work cannot be realized.

2. If the load of the lifting tool is increased, the metal tool will increase the lifting tonnage, which will be heavy and heavy, thereby increasing the difficulty of the operator, which is not conducive to the safety of the operation and increases the risk of the operation. Simultaneously, for the insulation lifting tool, it will bring great difficulties in design and manufacture to realize such a large load lifting.

3. Since the head of the cross-arm is mostly not flat, the bending and torsion resistance of the insulating material is weak when the operation is live. This puts higher requirements on the lifting position, and it cannot be used at will according to the requirements of power outage operations. At the same time, it must be lifted It is difficult to guarantee the mechanical strength of insulating materials due to heavy loads.

4. For live work with a lifting weight of more than 5 tons, during the operation process, there is no insulating material with such performance in terms of insulation backup protection measures to prevent wires from falling.

Based on the above analysis, it is necessary to study a new lifting operation method and tools to lift large-tonnage conductors, realize the integration of lifting and backup protection, and solve the work of replacing 500kV insulator strings under heavy loads. The relevant lifting equipment needs to be easy to operate and easy to install tools, so as to improve the risk control of live work and high-altitude work, reduce the labor intensity of operators, and enhance the safety of operations. This case was born from this.

Contents of the invention

Based on the above reasons, the inventor provides a lifting device for large-tonnage live wires.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A lifting device for large-tonnage live wires, including a lifting cross arm, a leveling bracket, a reinforcing device and a lifting device. There are two leveling brackets and they are respectively located on both sides of the middle section of the lifting cross arm. On the angle steel of the iron tower cross-arm, the upper part is fixedly connected with the lifting cross-arm; the reinforcing device is installed in the middle of the lifting cross-arm between the two leveling brackets, the upper part of the reinforcing device is fixedly connected with the lifting cross-arm, and the lower part is connected with the iron tower The angle steel of the cross arm is fixedly connected; the lifting device is symmetrically arranged at both ends of the lifting cross arm, and each end is equipped with two lifting devices.

The top of the leveling bracket is a flat U-shaped groove structure, and the lower sides of the leveling bracket are respectively fixed with bolts and the angle steel of the iron tower cross arm. The top of the leveling bracket is provided with a screw hole, which is fixed with the lifting cross arm by bolt connect.

The lifting cross arm includes two high-strength aluminum alloy plates, and the middle of the two aluminum alloy plates is fixedly connected with the aluminum alloy plates on both sides through several fixing plates.

The middle section and both ends of the lifting cross arm are provided with several reserved holes.

The reinforcing device includes two upper and lower high-strength aluminum alloy plates, and the two aluminum alloy plates are fixedly connected by pin bolts.

The lifting device includes a lifting screw, an insulating rod assembly and a four-wire lifting hook. The insulating rod assembly is provided with a number of through holes, the lifting screw is fixedly connected to the upper part of the insulating rod assembly, and the lower part of the insulating rod assembly is connected to the four-wire lifting hook. Fixed connection.

The fixed lifting device is provided with a fixed bracket on the lifting cross arm, and the fixed bracket is fixed on the lifting cross arm through bolts. The middle part of the fixed bracket is provided with a round hole. The fixed bracket and the lifting cross arm are fixedly connected.

Compared with the prior art, the present invention has the following advantages:

(1) Solved the problem that the wire cannot be lifted with electricity under the condition of large-span insulator and heavy load, and its effective load has been greatly improved;

(2) Through four lifting devices to form a four-point cooperative lifting, the creative multi-point cooperative scheme has greatly improved the stress of the insulating rod assembly during operation, thus realizing the possibility of lifting large-tonnage wires;

(3) The hoisting device is divided into main hoisting device and auxiliary hoisting device according to the position. The main hoisting device plays the role of mainly lifting the force of the wire during operation, and the auxiliary hoisting device plays the role of secondary load-bearing lifting during operation, mainly as a backup The protection provides secondary protection for the entire operation process. Through the combination of main and auxiliary, the safety and reliability of live lifting large-tonnage conductors are improved;

(4) The lifting device is installed on both sides of the iron tower cross arm, making full use of the space on both sides of the iron tower cross arm head;

(5) Use this device to lift the wire, and the lifting process is completed in the vertical direction, which solves the stability and reliability of the lifting process;

(6) The four-point hoisting cross-arm load-bearing wire point of this device is separated from the iron tower cross-arm force point, and there are two leveling brackets to improve the force of the iron tower connection point, avoiding concentrated stress and changing the previous lifting points. The concentrated load of the iron tower cross arm;

(7) The structure of the device is simple and easy to operate, which reduces the risk of live-line work and high-altitude work, reduces the labor intensity of operators, and enhances the safety of operations. It has good application value and promotional reference.

This device provides a reliable solution to timely eliminate hidden dangers of such equipment and ensure safe and reliable power supply of the power grid. At the same time, it will greatly promote the further expansion of the field of live operation of 500kV transmission lines.

The present invention will be further elaborated below through the accompanying drawings and specific embodiments.

Description of drawings:

Fig. 1 is the overall structure schematic diagram of the present invention;

Figure 2 is a schematic diagram of the installation structure of the leveling bracket;

Fig. 3 is the structural representation of reinforcing device;

Fig. 4 is a schematic diagram of the installation structure of the four-wire lifting hook at the bottom of the lifting device;

Fig. 5 is a top view structural schematic diagram of a fixed bracket;

Fig. 6 is a schematic cross-sectional structural view of the fixed bracket in the front view direction.

Detailed ways:

As shown in Figures 1 to 6, a lifting device for large-tonnage live wires includes a lifting cross arm 3, a leveling bracket 2, a reinforcing device 4 and a lifting device. Wherein, the lifting cross arm 3 includes two high-strength aluminum alloy plates with a thickness of 150 mm, and the middle of the two aluminum alloy plates is formed by fixing and combining with the aluminum alloy plates on both sides with bolts through a plurality of fixing plates 11 with a width of 150 mm. There are two leveling brackets 2 and they are respectively located on both sides of the middle section of the lifting cross arm 3. The top of the leveling bracket 2 is a flat U-shaped groove structure. The two sides of the lower part of the leveling bracket 2 are symmetrically provided with screw holes. The lower part of the leveling support 2 is fixed on the angle steel 1 of the iron tower cross arm to ensure that the uneven iron tower cross arm head is in a horizontal state, which is conducive to the stress balance of the wire lifting load. The top of the leveling bracket 2 is provided with screw holes, and the fixing plate 11 on the lifting cross arm 3 is fixedly connected with the leveling bracket 2 by bolts. The middle part and the side of the fixing plate 11 are provided with screw holes, and the middle section of the lifting cross arm 3 is provided with a number of reserved holes, which are used for fixing the leveling bracket 2, and a plurality of reserved holes are convenient for fixing the leveling bracket 2 The adjustment of the position is to adapt to different types of cross arms on different iron towers, and the bolts pass through the reserved holes in the middle section of the lifting cross arm 3 and are fixedly connected with the screw holes on the side of the fixing plate 11.

The reinforcing device 4 is located in the middle of the lifting cross arm 3 and between the two leveling brackets 2. The reinforcing device 4 includes two high-strength aluminum alloy plates, and the upper aluminum alloy plate 41 is placed on the lifting cross arm 3. On the upper end face, the lower aluminum alloy plate 42 is clamped with the lower part of the angle steel 1 of the iron tower cross arm, and the upper and lower two aluminum alloy plates are fixedly connected with pin bolts 43 . The reinforcing device 4 is mainly used to balance the moment formed by the force on both ends of the lifting cross arm 3 and the fulcrum leveling the bracket 2, thereby reducing the shear stress in the middle of the lifting cross arm 3.

The two ends of the lifting cross arm 3 are respectively provided with a number of reserved holes, the upper and lower sides are provided with a circular through hole 71 and the fixed bracket 7 with a symmetrical screw hole 72 is fixed to the reserved holes at the two ends of the lifting cross arm 3 by bolts. The reserved holes at both ends of the lifting cross arm 3 are used for the installation of the fixed bracket 7, and the setting of multiple reserved holes is convenient for adjusting the installation position of the fixed bracket 7 according to the needs of the bearing load. The fixed bracket 7 is mainly used for fixing the lifting device, and the fixed bracket 7 is symmetrically installed on both ends of the lifting cross arm 3, and each end is provided with two, and the two need to be separated by a certain distance.

Among them, four lifting devices are arranged in total, symmetrically arranged at both ends of the lifting cross-arm 3 , the two lifting devices near the middle of the lifting cross-arm 3 are the main lifting devices 5 , and the two on the outside are used as auxiliary lifting devices 6 . The main lifting device 5 plays the role of mainly lifting the force on the wire during operation, and the auxiliary lifting device 6 is mainly used as a backup protection to provide two anti-drop protection functions for the wire, and the safety and reliability of the lifting of large-tonnage live wires are increased through the combination of the main and the auxiliary. sex.

The above-mentioned lifting device is mainly composed of a lifting screw 8, an insulating rod assembly 9 and a four-wire lifting hook 10. The lifting screw 8 passes through the circular through hole on the fixed bracket 7, and the lifting screw 8 and the lifting cross-arm 3 are bolted together. And the fixed bracket 7 is fixed in one. The insulating rod assembly 9 is longitudinally provided with several through holes, the lifting lead screw 8 is fixed on the top of the insulating rod assembly 9 by bolts, and the bottom of the insulating rod assembly 9 is fixedly connected with the four-wire lifting hook 10 by bolts. A plurality of through holes provided on the insulating rod assembly 9 can be used for adjusting the position of the lifting screw 8 and the four-wire lifting hook 10, thereby realizing the adjustment of the length of the whole lifting device. During the lifting operation, the wire is hung on the four-wire lifting hook 10, and the wire is lifted and put down by tightening and loosening the lifting screw 8.

The invention arranges the lifting device in the outer space of the iron tower cross arm, forms four lifting points for the wire, decomposes and balances the lifting force, and makes it possible for the four lifting points to apply force together to make the live lifting of the large-tonnage wire possible. The device has a simple structure, is convenient to disassemble and assemble, can withstand a load greater than 6 tons, and facilitates the replacement of a whole string of straight pole insulators.

The above embodiments are only used to illustrate the technical solution of the present invention without limitation. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention should be covered as long as they do not depart from the spirit and scope of the technical solution of the present invention. Within the scope of the claims of the present invention.

Claims (6)

1. A kind of 1. lifting device of large-tonnage live wire, it is characterised in that：Including lifting cross-arm, horizontalization support, reinforcing device And lifting device, horizontalization support are two and respectively positioned at the stage casing both sides of lifting cross-arm, iron is fixed in the bottom of horizontalization support On the angle steel of tower cross-arm, top is fixedly connected with lifting cross-arm；Reinforcing device is located at the middle part of lifting cross-arm between two horizontalizations Between support, the top of reinforcing device is fixedly connected with lifting cross-arm, and bottom is fixedly connected with the angle steel of steel tower cross-arm；Lifting dress The both ends for being symmetricly set in lifting cross-arm are put, often end is equipped with two lifting devices；The reinforcing device includes upper and lower two pieces of height Strength aluminum alloy sheets, it is fixedly connected with wearing pin bolt between two pieces of aluminium alloy plates.
2. A kind of 2. lifting device of large-tonnage live wire according to claim 1, it is characterised in that：The horizontalization support It is the U-type groove structure of plane for top, the bottom both sides of horizontalization support are fixed with the angle steel of bolt and steel tower cross-arm respectively, horizontalization The top of support is provided with screw, is fixedly connected by bolt with lifting cross-arm.
3. A kind of 3. lifting device of large-tonnage live wire according to claim 1, it is characterised in that：The lifting cross-arm Including two pieces of high-strength aluminium alloy plates, the centre of two pieces of aluminium alloy plates is fixed by the aluminium alloy plate of some fixed plates and both sides to be connected Connect.
4. A kind of 4. lifting device of large-tonnage live wire according to claim 1, it is characterised in that：The lifting cross-arm Stage casing and both ends be equipped with some preformed holes.
5. A kind of 5. lifting device of large-tonnage live wire according to claim 1, it is characterised in that：The lifting device Including lifting leading screw, insulating rod component and four line hoist hooks, insulating rod component is provided with some through holes, lifts leading screw and insulating bar The top of component is fixedly connected, and the bottom of insulating rod component is fixedly connected with four line hoist hooks.
6. A kind of 6. lifting device of large-tonnage live wire according to claim 5, it is characterised in that：The lifting cross-arm Fixed support is provided with upper fixed lifting device, fixed support is secured by bolts on lifting cross-arm, support bracket fastened middle part Provided with circular hole, lifting leading screw is fixedly connected through the circular hole on fixed support, blending bolt with fixed support and lifting cross-arm.