Middle insulation connecting device for slide wire guide rail of high-voltage double-path feed crown block

Abstract

The invention discloses a high-voltage double-path feed crown block sliding contact line guide rail middle insulation connection method which comprises the following steps: firstly, supporting and fixing guide rails on two sides of a middle section of a sliding contact line through an insulator bracket, and enabling the distance between the end surfaces of the guide rails on the two sides to be 100-110 mm; the upper side face and the lower side face of the guide rail on each side are each provided with one insulation isolation block, and after all the insulation isolation blocks are installed, the distance between the insulation isolation blocks on the two sides ranges from 3 mm to 10 mm. According to the method, the proper isolation distance can be guaranteed, the high-temperature-resistant ceramic insulation isolation blocks are adopted for isolation, the problem of insulation breakdown is avoided, the insulation performance of the middle section is guaranteed, when abnormal power failure occurs on the guide rail on one side, the crown block on the sliding contact line on the other side can still continue to operate normally, and the service life of the crown block is prolonged. And the situation of whole-line production halt maintenance caused by the isolation block problem is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply feed carriers of rail-mounted mobile cranes (or bridge cranes), and in particular relates to a method for insulating the middle of a high-voltage dual-circuit feed crane busbar guide rail. Background Art

[0002] The heavy overhead crane (or bridge crane) in the smelting area of ​​a large steel plant is powered by a steel-based rigid copper rod conductor busbar (such as Figure 1 As shown in the figure), AC 3000V power supply voltage, side sliding contact is the mainstream, the length of the busbar is generally more than 500 meters, and there are multiple overhead cranes or cranes running on this busbar. The busbar rail is usually equipped with left and right dual-circuit feeders, and the middle section is connected with a rail insulation isolation device. And at the middle rail insulation section (such as Figure 2 As shown in GL), a tie switch (circuit breaker) is used for bypass short circuit, which is convenient for maintenance. When the tie switch is closed, the left and right busbars are connected for use; when the tie switch is disconnected, the left and right busbars are used in sections. During the maintenance process, the tie switch can be disconnected or closed according to the actual situation for relevant maintenance.

[0003] At present, for the 3000V power supply voltage, the middle section of the dual-circuit feeder overhead crane busbar is generally isolated and connected by two upper and lower 3240 epoxy plates fixed on the guide rail. Under normal circumstances, the 3240 epoxy plate can play an isolation role and achieve the purpose of power supply in the left and right sections; but in the actual production process, when the overhead crane (or bridge crane) passes through the isolation device, its feed collector slider will cause contact arcing when sliding over the isolation block (3240 epoxy plate). The insulating isolation block cannot withstand the high temperature of more than 1000℃ generated by the arc and burns out and carbonizes, losing its insulation ability; if an abnormal power trip occurs, it will cause the entire 3KV busbar to trip. Therefore, in the actual production process, the epoxy plate needs to be cleaned, repaired, replaced and maintained frequently, which is time-consuming and labor-intensive. Summary of the invention

[0004] In order to solve the problem that the prior art cannot meet the requirements of high-voltage busbar guide rail isolation and load-carrying operation, the purpose of the present invention is to provide a busbar intermediate rail insulation isolation connection device that meets the requirements of high voltage insulation, wear resistance, vibration resistance and high temperature resistance.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for insulating the middle of the busbar guide rail of a high-voltage dual-circuit feeding overhead crane, characterized in that the guide rails on both sides of the middle section of the busbar are first supported and fixed by an insulator bracket, and the spacing between the end faces of the guide rails on both sides is 100-110mm; then a non-contact insulating connection is performed on the middle section by a ceramic insulating isolation block, wherein an insulating isolation block is respectively arranged on the upper and lower side surfaces of each side guide rail, and a shock-absorbing pad is arranged between the upper and lower insulating isolation blocks of each side guide rail and the guide rail and is fixedly connected to the guide rail by a bolt assembly; after all the insulating isolation blocks are installed, the spacing between the insulating isolation blocks on both sides is 3-10mm.

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

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

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

[0009] The beneficial effects of the present invention are as follows: by adopting the method of the present invention, the guide rails on both sides of the middle section of the busbar are first supported and fixed by the insulator bracket to ensure an isolation distance suitable for 3KV high voltage. In addition, high temperature resistant ceramic insulating isolation blocks are used for isolation, so that there will be no problem of insulation breakdown, and the insulation performance of the middle section is ensured. When an abnormal power failure occurs on the guide rail on one side, the overhead crane on the busbar on the other side can continue to operate normally, avoiding the situation where the entire line is shut down for maintenance due to problems with the isolation blocks.

[0010] The present invention adopts an insulating isolation block made of 99 alumina ceramic material, which has high hardness and wear resistance, can maintain its original appearance and performance for a long time, has good insulation performance, long service life, and reduces the maintenance workload after use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of a steel-based rigid copper rod conductor busbar.

[0012] Figure 2 Schematic diagram of adding a contact switch in the middle section of the guide rail.

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

[0014] Figure 4 It is a schematic structural diagram of the ceramic insulating isolation block of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0016] like Figure 3 As shown, the present invention provides a method for insulating the middle of the busbar rail of a high-voltage dual-circuit feeder overhead traveling vehicle. First, the left and right side rails 20 at the middle section of the busbar are supported and fixed by an insulator bracket 10, and the distance L1 between the end faces of the two side rails is 105 mm, meeting the electrical clearance standard of the 3000V voltage level. Then, the middle section is non-contact insulated by a ceramic insulating isolation block 30.

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

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

[0019] Furthermore, the ceramic isolation block 30 is made of 99 alumina ceramic material (99% AL2O3), which has good wear resistance and can withstand high temperatures above 1700°C, meeting the requirements of the present invention for the isolation block to be wear-resistant and high-temperature-resistant.

[0020] By adopting the method of the present invention for practical application, the middle isolation performance of the overhead crane feeder busbar in the steelmaking workshop of a large steel plant can be guaranteed, and the left and right sections of the busbar can be powered for production. When the busbar on one side abnormally trips, the normal lifting of the crane on the busbar on the other side can be guaranteed, thereby maintaining continuous production operation.

[0021] The above are only 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 in the protection scope of the present invention.

Claims

1. A method for connecting the middle insulation of the busbar rail of a high-voltage dual-circuit feeder overhead traveling vehicle, characterized in that: First, the guide rails on both sides of the middle section of the busbar are supported and fixed by insulator brackets, and the spacing between the end faces of the guide rails on both sides is 100-110mm; then, non-contact insulation connection is performed at the middle section by ceramic insulating isolation blocks, wherein an insulating isolation block is arranged on the upper and lower sides of each side of the guide rail, and shock-absorbing pads are arranged between the upper and lower insulating isolation blocks of each side of the guide rail and the guide rails, and are fixed to the guide rails by bolt assemblies; after all the insulating isolation blocks are installed, the spacing between the insulating isolation blocks on both sides is 3-10mm.

2. The method for connecting the middle insulation of the busbar rail of a high-voltage dual-circuit feeder overhead traveling vehicle according to claim 1 is characterized in that: The bolt assembly comprises a screw rod, a T-ring and a fastening nut, and the T-ring is a nylon concave-convex washer.

3. The method for connecting the middle insulation of the busbar rails of a high-voltage dual-circuit feeder overhead traveling vehicle according to claim 1 is characterized in that: The shock-absorbing pad is made of silicone rubber material and has a thickness of 1-3 mm.

4. The method for connecting the middle insulation of the busbar rails of a high-voltage dual-circuit feeder overhead traveling vehicle according to any one of claims 1 to 3, characterized in that: The ceramic isolation block is made of 99% alumina ceramic material.

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