An on-line repairing device for the bolt hole of the cross arm of the electric furnace

Abstract

The utility model discloses an online repairing device for the bolt hole of the clamp head of the electric furnace conductive cross arm, which comprises a magnetic drill, a magnetic drill fixing bottom plate, bottom plate fixing bolts and a broken bolt extractor, the magnetic drill fixing bottom plate is provided with through holes corresponding to each clamp head bolt hole on the electric furnace conductive cross arm, a plurality of bottom plate fixing bolts are respectively screwed into the corresponding undamaged clamp head bolt holes after passing through different through holes on the magnetic drill fixing bottom plate, the magnetic drill is adsorbed on the magnetic drill fixing bottom plate, and the drill bit of the magnetic drill is opposite to the broken bolt in the damaged clamp head bolt hole. The utility model fixes the magnetic drill fixing bottom plate on the conductive cross arm by the undamaged clamp head bolt hole, takes out the broken bolt by the magnetic drill adsorbed on the magnetic drill fixing bottom plate and the broken bolt extractor, realizes the online repairing of the clamp head bolt hole without replacing the conductive cross arm, greatly improves the repairing efficiency of the clamp head bolt hole, reduces the maintenance cost and lightens the labor intensity of workers.

Description

Technical Field

[0001] This utility model relates to an online repair device for bolt holes in the conductive cross arm clamp of an electric furnace, belonging to the field of metallurgical equipment technology. Background Technology

[0002] As a key piece of equipment in the primary smelting stage, the electric arc furnace in a steelmaking plant is responsible for melting scrap steel, slag formation and impurity removal, and rough composition adjustment. Its smelting electrodes (carbon rods) are primarily held by copper clamps and ferrules at the front of a three-phase conductive crossarm. Clamping and releasing the electrodes are achieved through the cooperation of a clamp release cylinder and disc springs inside the conductive crossarm. The three-phase conductive crossarm is made of copper-steel composite material. The front section where the copper clamps are fixed is U-shaped, with copper material on both sides of the groove opening and six bolt holes drilled in it. Copper wire sleeves are installed in these bolt holes. The copper clamps are fixed to the front of the conductive crossarm by clamp fixing bolts connected to these bolt holes. A ferrule positioning device is installed inside the U-shaped groove. Because the copper chucks operate in harsh environments with high temperatures, dust, slag splashes, and arcing during electric arc furnace operation, they are prone to damage. When replacing copper chucks, it's common to encounter situations where the chuck fixing bolts break off inside the bolt holes. Since the front of the conductive cross arm is made of copper and has a low center, with narrow openings on both sides, it's impossible to use a magnetic drill to remove the broken bolts. Therefore, the current method is to replace the entire conductive cross arm and repair the bolt holes offline to solve the problem of broken chuck fixing bolts. However, this method of replacing the entire conductive cross arm is time-consuming, costly, and physically demanding for workers. Therefore, there is an urgent need for a device that can quickly repair bolt holes online. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an online repair device for the bolt holes of the conductive cross arm clamp of an electric arc furnace, thereby improving the repair efficiency of the bolt holes, reducing maintenance costs, and alleviating the labor intensity of maintenance workers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An online repair device for the chuck bolt holes of an electric furnace conductive crossarm includes a magnetic drill, a magnetic drill base plate, base plate fixing bolts, and a broken wire extractor. The magnetic drill base plate has through holes corresponding to each chuck bolt hole on the electric furnace conductive crossarm. Multiple base plate fixing bolts pass through different through holes on the magnetic drill base plate and are screwed into the corresponding undamaged chuck bolt holes. The magnetic drill is attached to the magnetic drill base plate, and the drill bit of the magnetic drill is aligned with the broken bolt in the damaged chuck bolt hole, machining a hole on the broken bolt that matches the broken wire extractor.

[0005] In the above-mentioned online repair device for the bolt holes of the conductive cross arm chuck of the electric furnace, the through hole on the magnetic drill fixing base plate is a smooth hole, and the diameter of the through hole is 3-5mm larger than the diameter of the chuck fixing bolt.

[0006] In the above-mentioned online repair device for the bolt holes of the conductive cross arm of the electric furnace, the thickness of the magnetic drill fixing base plate is 10mm.

[0007] In the above-mentioned online repair device for the bolt holes of the conductive cross arm of the electric furnace, the material of the magnetic drill fixing base plate is steel.

[0008] This invention utilizes the undamaged chuck bolt hole and base plate fixing bolt to fix the magnetic drill base plate onto the conductive cross arm. The broken bolt is removed using the magnetic drill and broken wire extractor adsorbed on the magnetic drill base plate. This allows for online repair of the chuck bolt hole without replacing the conductive cross arm, greatly improving the repair efficiency, reducing maintenance costs, and alleviating the labor intensity of workers. Attached Figure Description

[0009] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0010] Figure 1 This is a schematic diagram illustrating the use of this utility model; Figure 2 This is a schematic diagram of the structure of the base plate for fixing a magnetic drill.

[0011] The following are the labels in the diagram: 1. Magnetic drill, 2. Magnetic drill base plate, 3. Chuck bolt hole, 4. Chuck release cylinder, 5. Conductive cross arm, 6. Broken bolt, 7. Through hole. Detailed Implementation

[0012] This utility model addresses the problems existing in the prior art by providing an online repair device for the bolt holes of the conductive crossarm chuck in electric furnaces. This device can remove broken bolts from the bolt holes of the chucks using a magnetic drill without replacing the conductive crossarm, thereby repairing the bolt holes and enabling online replacement of the copper chucks. This achieves the goals of saving maintenance time, reducing maintenance costs, and alleviating the labor intensity of maintenance workers.

[0013] See Figure 1 and Figure 2 The present invention includes a magnetic drill 1, a magnetic drill fixing base plate 2, a base plate fixing bolt, and a broken wire extractor (the base plate fixing bolt and the broken wire extractor are not shown in the figure). The magnetic drill fixing base plate 2 is used to fix the magnetic drill 1 on the conductive cross arm 5. The magnetic drill 1 is used to drill a hole in the broken bolt so that the broken bolt can be removed with the broken wire extractor.

[0014] Figure 1The diagram shows that the conductive crossarm 5 is made of copper-steel composite material. A chuck release cylinder 4 is installed at the bottom of its front U-shaped groove, and copper chucks (not shown in the diagram) are installed on both sides of the groove to hold the smelting electrodes. The chuck installation points on both sides of the front U-shaped groove of the conductive crossarm are made of copper and cannot directly attract the magnetic drill 1. There are three chuck bolt holes 3 on each side of the groove. The magnetic drill fixing base plate 2 has through holes 7 corresponding to each chuck bolt hole 3 on the conductive crossarm 5. The through holes 7 are smooth holes with a diameter 3-5mm larger than the chuck fixing bolts. They are fixed to the front of the conductive crossarm 5 at the position where the copper chucks are fixed through the undamaged chuck bolt holes 3 and the base plate fixing bolts. The magnetic drill fixing base plate 2 is made of steel. The magnetic drill 1 is attracted to the magnetic drill fixing base plate 2. The drill bit of the magnetic drill 1 is aligned with the broken bolt 6 in the damaged chuck bolt hole 3, and the broken bolt 6 is removed by drilling. First, use a hollow drill bit to drill around the adhesive area of ​​the broken bolt, then drill a hole in the broken bolt 6, then use a broken thread extractor to remove the broken bolt 6, and finally install a new thread sleeve to complete the repair of the chuck bolt hole.

[0015] When repairing the chuck bolt hole online, first remove the copper chuck, pass the base plate fixing bolt through the through hole 7 on the magnetic drill fixing base plate 2 and screw it into the corresponding undamaged chuck bolt hole 3. Fix the steel magnetic drill fixing base plate 2 to the copper chuck installation position at the front of the conductive cross arm 5. Then, attach the magnetic drill 1 to the magnetic drill fixing base plate 2, use a hollow drill bit to drill the adhesive area around the broken bolt 6, then drill a hole in the broken bolt 6, and finally remove the broken bolt 6 using a broken wire extractor. Finally, install a new wire sleeve.

[0016] The specifications of the magnetic drill 1 and the size of the through hole 7 on the magnetic drill base plate 2 are determined according to the size of the chuck fixing bolt on the electric furnace. If the diameter of the chuck fixing bolt is M30, an M32 hollow drill bit can be used to drill the area around the broken bolt that is stuck together. Then, an M10 drill bit is used to drill an M10 hole in the broken bolt, and a broken wire extractor is used to remove the broken wire after drilling through the M10 hole.

[0017] The magnetic drill base plate 2 is made of 10mm steel plate, and six through holes 7 with a diameter of 36mm are drilled on the magnetic drill base plate 2 at the positions corresponding to the chuck bolt holes 3.

[0018] This invention features a simple structure, ease of use, and safe operation, significantly reducing the labor intensity of workers. Furthermore, it simplifies the construction process, shortens construction time, improves the maintenance efficiency of the bolt holes in the conductive crossarm of the electric arc furnace, and reduces maintenance costs. This device can be applied to similar electric arc furnaces currently in use in China, demonstrating its widespread applicability and potential for wider adoption.

Claims

1. An online repair device for bolt holes in the conductive crossarm of an electric furnace, characterized in that, The device includes a magnetic drill (1), a magnetic drill base plate (2), base plate fixing bolts, and a broken wire extractor. The magnetic drill base plate (2) is provided with through holes (7) corresponding to each chuck bolt hole (3) on the electric furnace conductive cross arm (5). Multiple base plate fixing bolts pass through different through holes (7) on the magnetic drill base plate (2) and are screwed into the corresponding undamaged chuck bolt holes (3). The magnetic drill (1) is attached to the magnetic drill base plate (2). The drill bit of the magnetic drill (1) is opposite to the broken bolt (6) in the damaged chuck bolt hole (3). A hole matching the broken wire extractor is machined on the broken bolt (6).

2. The online repair device for the bolt holes of the conductive crossarm of an electric furnace according to claim 1, characterized in that, The through hole (7) on the magnetic drill base plate (2) is a smooth hole, and the diameter of the through hole (7) is 3-5 mm larger than the diameter of the chuck fixing bolt.

3. The online repair device for the bolt holes of the conductive crossarm of an electric furnace according to claim 1 or 2, characterized in that, The thickness of the magnetic drill base plate (2) is 10mm.

4. The online repair device for the bolt holes of the conductive crossarm of an electric furnace according to claim 3, characterized in that, The magnetic drill base plate (2) is made of steel.

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