A high-voltage double-feed catenary sliding contact line guide rail middle insulation coupling method

Abstract

The application discloses a high-voltage double-path feeding trolley slide contact line guide rail middle insulation connecting method, which supports and fixes the guide rails on both sides of the middle section of the slide contact line through an insulator support, and makes the distance between the end faces of the guide rails on both sides 100-110 mm; and then the middle section is non-contact insulation connected through ceramic insulation isolation blocks, wherein one insulation isolation block is arranged on the upper and lower side faces of each guide rail, and the distance between the insulation isolation blocks on both sides is 3-10 mm after all the insulation isolation blocks are installed. The method can guarantee a suitable isolation distance, and the high-temperature-resistant ceramic insulation isolation blocks are used for isolation, so that the problem of insulation breakdown does not occur, and the insulation performance of the middle section is ensured; when abnormal power failure occurs on one side of the guide rail, the trolley on the slide contact line on the other side can still normally operate, and the situation of whole line shutdown for maintenance due to the problem of the isolation block is avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of power supply carriers for track-mounted overhead cranes (or bridge cranes), specifically relating to a method for intermediate insulation connection of the sliding contact line rail of a high-voltage dual-feed overhead crane. Background Technology

[0002] The power supply method for heavy-duty overhead cranes (or bridge cranes) in the smelting area of ​​large steel plants is to use steel-based rigid copper rod conductor sliding contact lines (such as...). Figure 1 As shown), AC 3000V power supply voltage and side sliding contact method are the mainstream, with the sliding contact line length generally exceeding 500 meters. Multiple overhead cranes or cranes operate on this sliding contact line. The sliding contact line guide rail is usually equipped with dual power supply on the left and right sections, and the middle section is connected using a guide rail insulation isolation device. Furthermore, at the middle guide rail insulation section (such as...) Figure 2 As shown in Figure GL), a tie switch (circuit breaker) is used for bypass short-circuiting to facilitate maintenance. When the tie switch is closed, the left and right sliding contact lines are connected; when the tie switch is open, the left and right sliding contact lines are used separately. During maintenance, the tie switch can be opened or closed as needed for relevant maintenance.

[0003] Currently, for dual-feed overhead crane sliding contact lines with a 3000V power supply, the middle section is typically isolated using two 3240 epoxy boards fixed to the guide rails. Under normal circumstances, the 3240 epoxy boards provide isolation, achieving the purpose of separate power supply for the left and right sections. However, in actual production, when the overhead crane (or bridge crane) passes through the isolation device, the current collector slider causes contact arcing as it slides over the isolation block (3240 epoxy board). The insulating isolation block cannot withstand the high temperature (over 1000℃) generated by the arcing and burns and carbonizes, losing its insulation capacity. If an abnormal power outage occurs, it can cause the entire 3KV sliding contact line to trip. Therefore, in actual production, frequent cleaning, inspection, replacement, and maintenance of the epoxy boards are required, which is time-consuming and labor-intensive. Summary of the Invention

[0004] To address the problem that existing technologies cannot meet the requirements of high-voltage sliding contact line rail isolation and load-bearing operation, the present invention aims to provide a sliding contact line intermediate rail insulation and isolation connection method that meets the requirements of high-voltage insulation, wear resistance, vibration resistance, and high-temperature resistance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a method for intermediate insulation connection of the sliding contact line rail of a high-voltage dual-feed overhead crane, characterized in that, firstly, the rails on both sides of the intermediate segment of the sliding contact line are supported and fixed by an insulator bracket, and the distance between the end faces of the rails on both sides is 100-110mm; then, a non-contact insulation connection is made at the intermediate segment by ceramic insulating blocks, wherein a ceramic insulating block is set on the upper and lower sides of each rail, and a shock-absorbing pad is provided between the upper and lower ceramic insulating blocks on each side of the rail and the rail, and the blocks are fixedly connected to the rail by bolt assemblies; after all ceramic insulating blocks are installed, the distance between the ceramic insulating blocks on both sides is 3-10mm.

[0006] Furthermore, the bolt assembly includes a bolt, a T-ring, and a fastening nut, wherein the T-ring is a nylon convex-concave washer.

[0007] Furthermore, the shock-absorbing pad is made of silicone rubber material with a thickness of 1-3 mm.

[0008] Furthermore, the ceramic insulating block is made of 99% alumina ceramic material.

[0009] The beneficial effects of this invention are as follows: Using the method of this invention, the guide rails on both sides of the middle section of the sliding contact line are first supported and fixed by insulator brackets to ensure an isolation distance suitable for 3KV high voltage. Furthermore, high-temperature resistant ceramic insulating blocks are used for isolation, preventing insulation breakdown and ensuring the insulation performance at the middle section. When one guide rail experiences an abnormal power outage, the overhead crane on the other side of the sliding contact line can continue to operate normally, avoiding a complete production shutdown for maintenance due to problems with the insulating blocks.

[0010] This invention uses ceramic insulating blocks made of 99% alumina ceramic material, which have high hardness and wear resistance, can maintain their original appearance and performance for a long time, have excellent insulation performance, long service life, and reduce the amount of maintenance work in the later stage of use. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a steel-based rigid copper rod conductor sliding contact line.

[0012] Figure 2 A schematic diagram showing the addition of a connecting switch at the middle section of the guide rail.

[0013] Figure 3 This is a schematic diagram of the structure of the ceramic insulating block of the present invention after installation.

[0014] Figure 4 This is a schematic diagram of the structure of the ceramic insulating block of the present invention. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings.

[0016] like Figure 3 As shown, this invention discloses a method for intermediate insulation connection of the sliding contact line rails of a high-voltage dual-feed overhead crane. First, the left and right guide rails 20 at the intermediate segment of the sliding contact line are supported and fixed by an insulator bracket 10, ensuring that the distance L1 between the end faces of the two guide rails is 105mm, meeting the electrical clearance standard for a 3000V voltage level. Then, a ceramic insulating block 30 is used to perform a non-contact insulation connection at the intermediate segment.

[0017] Specifically, four ceramic insulating isolation blocks 30 are provided. One ceramic insulating isolation block 30 is symmetrically arranged on the upper and lower sides of each guide rail, and a shock-absorbing pad 40 is provided between the upper and lower ceramic insulating isolation blocks and the guide rail on each side. The shock-absorbing pad 40 is made of silicone rubber material with a thickness of 1-3mm, serving a cushioning function. Furthermore, as... Figure 3 , 4 As shown, the ceramic insulating block 30 has three mounting holes 301, and the guide rail has corresponding through holes. The upper and lower ceramic insulating blocks are fixedly connected to the guide rail by bolt assemblies 50 passing through the mounting holes 301 and the guide rail through holes. After all ceramic insulating blocks 30 are installed, the spacing L2 between the ceramic insulating blocks on both sides of the guide rail is 3-10mm. Setting the spacing L2 facilitates the installation of the ceramic insulating blocks and also reduces the accumulation of dust and other contaminants in the factory area on the blocks, which can affect the insulation performance.

[0018] Preferably, the bolt assembly 50 includes a screw 51, a T-ring 52, and a fastening nut 53, wherein the T-ring 52 is a nylon convex-concave washer.

[0019] Furthermore, the ceramic insulating block 30 is made of 99% alumina ceramic material (99% AL2O3), which has good wear resistance and can withstand high temperatures above 1700℃, thus meeting the requirements of the present invention for wear resistance and high temperature resistance of the insulating block.

[0020] By applying the method of this invention in practice, the intermediate isolation performance of the overhead crane feeder sliding contact line in the steelmaking workshop of a large steel plant can be guaranteed, and production can be carried out by supplying power to the left and right sections. When one side of the sliding contact line trips abnormally, the crane on the other side of the sliding contact line can be guaranteed to carry out normal hoisting and maintain continuous production.

[0021] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for intermediate insulation connection of the sliding contact line rail of a high-voltage dual-feed overhead crane, characterized in that, First, the guide rails on both sides of the middle section of the sliding contact line are supported and fixed by the insulator bracket, and the distance between the end faces of the guide rails on both sides is 100-110mm. Then, the middle section is connected by non-contact insulation using ceramic insulating blocks. One ceramic insulating block is installed on the upper and lower sides of each guide rail. The upper and lower ceramic insulating blocks on each side are provided with shock-absorbing pads between themselves and the guide rails and are fixed to the guide rails by bolt assemblies. After all ceramic insulating blocks are installed, the distance between the ceramic insulating blocks on both sides is 3-10mm.

2. The method for intermediate insulation connection of the sliding contact line rail of a high-voltage dual-feed overhead crane according to claim 1, characterized in that, The bolt assembly includes a bolt, a T-ring, and a fastening nut, wherein the T-ring is a nylon convex-concave washer.

3. The method for intermediate insulation connection of the sliding contact line rail of a high-voltage dual-feed overhead crane according to claim 1, characterized in that, The shock-absorbing pad is made of silicone rubber material with a thickness of 1-3mm.

4. The method for intermediate insulation connection of the sliding contact line rail of a high-voltage dual-feed overhead crane according to any one of claims 1-3, characterized in that, The ceramic insulating block is made of 99% alumina ceramic material.

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