CN102274963B - Ladle electromagnetic induction heating tapping device and installation method thereof - Google Patents

Abstract

The invention relates to a ladle electromagnetic induction heating steel taping device and an installation method thereof, and belongs to the technical of metallurgy. The device comprises a ladle wall; the bottom part of an inner side of the ladle wall is provided with pocket bricks; a bottom refractory material layer is arranged between the pocket bricks and the ladle wall; an induction heating coil is embedded in the pocket bricks; the periphery of the induction heating coil is provided with a heat insulation refractory material layer; a maintenance flange is arranged in a first through hole formed in the bottom part of the ladle wall; the through hole is provided with an upper water gap; and an upper sliding plate and a lower sliding plate are arranged below the maintenance flange. The installation method comprises the following steps of: placing a ladle in which the coil is to be installed in a ladle tipping device; tightly clamping the ladle; flattening the ladle; checking whether a lead is damaged; discharging the lead; twisting off a bottom bolt of the ladle; opening the maintenance flange; installing an internal pocket brick in an external pocket brick; covering the maintenance flange; tightening the bottom bolt; connecting the induction coil and a quick junction box by using the lead; positively placing the ladle; and adding iron-carbon particles into the upper water gap and thus waiting for steel tapping.

Description

Ladle electromagnetic induction heating tapping device and installation method thereof

technical field

The invention belongs to the technical field of metallurgy, in particular to a ladle electromagnetic induction heating tapping device and an installation method thereof.

Background technique

In recent years, with the development of science and technology, the requirements for steel properties have become increasingly stringent, and the requirements for steel quality have been continuously improved. Further reducing the content of impurities and inclusions in steel and improving the cleanliness and purity of steel are issues that people are keen to study. In continuous casting production, in order to make molten steel flow out of the ladle smoothly, in the space from the bottom of the ladle to the upper part of the sliding nozzle, powdered oxides with high melting points are generally added as auxiliary refractory materials for drainage, which is called drainage sand. . When the slide plate of the nozzle is opened, the molten steel can flow out automatically with the flow of the drainage sand, which is usually called automatic pouring. Drainage sand has been widely used as a pouring method, but with the advancement of science and technology, people have more and more stringent requirements on the quality of steel. While continuously developing new steel types, further improving the purity of molten steel has also received people's attention. Metallurgical workers at home and abroad have done a lot of work. Ruan Xiaojiang, Zhang Guowei, Leng Yonglei and others developed the discharge continuous casting large ladle pouring and drainage device, and the high-pressure blowing method developed by Japan's Sumitomo Kashima Plant used The method of separating the drainage sand from the molten steel in the tundish prevents the pollution of the molten steel in the tundish. These methods can be said to improve the cleanliness of molten steel to a certain extent, but the disadvantage is that these methods are completed without the protection of the long nozzle, that is to say, there are still some molten steel and air when pouring. Contact secondary oxidation occurs. In addition, as a traditional drainage method, a chemical reaction will also occur at the interface between the drainage sand inside the ladle and the molten steel. Japanese scholar TANAKA and others pointed out that the drainage sand used as the filling material for the nozzle at the bottom of the ladle will cause secondary pollution of the molten steel.

The steel ladle electromagnetic induction heating drainage process is to replace the traditional drainage sand with iron-carbon alloy particles and fill them into the upper nozzle of the ladle. After the steel package is filled with molten steel, under the action of heat conduction, some iron-carbon alloy particles in the upper nozzle will Melt, and form a solidified plugging steel shell inside the nozzle during the transfer of the ladle, which plays the role of blocking the leakage of molten steel; at the pouring station, use the induction coil arranged around the nozzle inside the block to generate The electric current quickly melts the solidified steel shell to complete the process of pouring.

The biggest advantage of the ladle electromagnetic induction heating drainage and steel tapping process is that it can solve the problem that the current drainage sand drainage method cannot reach 100% pouring, can completely eliminate the pollution of the drainage sand to the molten steel, and improve the cleanliness of the molten steel to the greatest extent. However, this process also has some production problems: first, the layout of the coils, because the block is pressed at high temperature, it is not easy to bury the coil inside the block with the existing technology; secondly, the installation of the coil As for the maintenance problem, the current process is to load the seat brick from the upper part of the ladle. For the turnover ladle that has just come off the production line, if you want to maintain and inspect the coil, you must cool the ladle to room temperature before taking it out, which will definitely disrupt the normal operation. At the same time, the cooled steel ladle needs to be baked twice, which wastes energy and increases the cost per ton of steel. Finally, during the transportation and lifting of the steel ladle, the induction coil cannot be water-cooled, because the induction coil is made of copper. Its melting point is 1084°C, which is relatively low, and it is easy to burn out the coil and lose its working ability.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a ladle electromagnetic induction heating tapping device and its installation method, the purpose of which is to solve the problem of installation and maintenance of the induction coil in the current process by improving the installation method of the induction coil and the structure of the bottom of the ladle. The practical problems, so that the process can be industrialized, so as to achieve the purpose of further improving the cleanliness of molten steel.

In order to achieve the above object, the present invention adopts the following technical solution, a ladle electromagnetic induction heating tapping device, comprising a ladle wall with a refractory material layer on the inside and a first through hole at the bottom, and a center with a second hole at the bottom of the inside of the ladle wall. For the seat brick with two through holes, a bottom refractory material layer is arranged between the seat brick and the ladle wall; an induction heating coil is embedded inside the seat brick, and a heat-insulating refractory material layer is arranged around the induction heating coil, and the coil passes through The connecting lead is connected with the quick junction box; a maintenance flange with a third through hole in the center is arranged in the first through hole at the bottom of the ladle wall, the second through hole is opposite to the third through hole, and the second through hole is in the second through hole. The through hole and the third through hole are provided with an upper nozzle with iron-carbon alloy particles inside; the maintenance flange is fixed on the bottom of the ladle by bottom bolts, and an upper and lower slide plate with a lower nozzle at the bottom is arranged under the maintenance flange.

The seat brick is made into an internal and external combined seat brick. The installation method of the induction heating coil is built-in, installed inside the seat brick inside the ladle, and then the inner seat brick is installed inside the outer seat brick.

The inner and outer sides and the upper end surface of the induction heating coil are covered with heat-insulating refractory materials.

There is a round hole at the bottom of the ladle, which is used for the installation and maintenance of the inner block, and the installation and maintenance flange of the inner block is screwed to the round hole to seal the inner block.

The connection between the induction heating coil and the quick junction box is realized by a hose with a water-cooled cable inside and the outer material is high-temperature-resistant glass fiber.

The installation method of the ladle electromagnetic induction heating tapping device comprises the following steps:

Step 1: Place the ladle to be installed with the induction coil on the ladle tipping device;

Step 2: Start the hydraulic clamping device to clamp the ladle;

Step 3: Start the ladle tipping device and lay the ladle flat;

Step 4: Check whether the lead wire is damaged, and remove the connecting lead wire;

Step 5: Use a wrench to unscrew the bottom bolt of the ladle to open the maintenance flange;

Step 6: Install the inner block with the induction coil and heat-insulating refractory layer inside the outer block;

Step 7: Cover the maintenance flange, tighten the bottom bolt, and connect the induction coil to the quick junction box with the lead wire;

Step 8: Start the ladle tipping device and put the ladle upright;

Step 9: Add iron-carbon alloy particles into the upper nozzle and wait for tapping; complete the entire installation process.

Beneficial effects of the present invention:

The installation method of the present invention can avoid the burning of the coil due to the impossibility of water cooling during the transportation and lifting of the ladle; at the same time, the coil can be maintained and inspected when the ladle is finished with steel or off the assembly line, without removing the ladle Cooling to room temperature will not disrupt the normal production rhythm, ensuring high production efficiency and saving energy.

Description of drawings

Fig. 1 is the structural representation of ladle electromagnetic induction heating tapping device of the present invention;

Fig. 2 is the program flowchart of the installation method of ladle electromagnetic induction heating tapping device of the present invention;

In the figure, 1—ladle wall, 2—refractory layer, 3—refractory layer at the bottom of the ladle, 4—coil, 5—quick junction box, 6—lead wire, 7—upper and lower sliding plate, 8—iron-carbon alloy particles, 9— Upper nozzle, 10—external block, 11—inner block, 12—insulation refractory layer, 13—maintenance flange, 14—bottom bolt, 15—drain.

Detailed ways

The present invention will be further explained below in conjunction with accompanying drawing and specific embodiment:

Example 1

A ladle electromagnetic induction heating tapping device, as shown in Figure 1, includes a ladle wall 1 with a refractory material layer 2 inside and a first through hole at the bottom, and a second through hole in the center at the bottom of the inside of the ladle wall 1 The outer seat brick 10 is provided with the bottom refractory material layer 3 between the outer seat brick 10 and the ladle wall 1; the inner seat brick 11 embedded with the coil 4 is arranged inside the outer seat brick 10, and the inner seat brick 11 and the coil 4 are provided with a heat-insulating refractory material layer 12, and the coil 4 is connected to the quick junction box 5 through the connecting lead 6; a third through hole is provided in the first through hole at the bottom of the ladle wall 1 The maintenance flange 13, the second through hole is opposite to the third through hole, and the upper nozzle 9 with iron-carbon alloy particles 8 inside is arranged in the second through hole and the third through hole; the maintenance method The flange 13 is fixed on the bottom of the ladle by the bottom bolt 14, and an upper and lower sliding plate 7 with a nozzle 15 at the bottom is arranged below the maintenance flange 13, and the outer block 10 and the inner block 11 form a combined block.

The installation method of the ladle electromagnetic induction heating tapping device, as shown in Figure 2, comprises the following steps:

Step 1: Place the ladle to be installed with the induction coil 4 on the ladle tipping device;

Step 2: Start the hydraulic clamping device to clamp the ladle;

Step 3: Start the ladle tipping device and lay the ladle flat;

Step 4: Check whether the lead wire 6 is damaged, and remove the connecting lead wire 6;

Step 5: unscrew the bottom bolt 14 of the ladle with a wrench, and open the maintenance flange 13;

Step 6: Install the inner block 11 with the induction coil 4 and the insulating refractory material layer 12 inside the outer block 10;

Step 7: Cover the maintenance flange 13, tighten the bottom bolt 14, and connect the induction coil 4 to the quick junction box 5 with the lead wire 6;

Step 8: Start the ladle tipping device and put the ladle upright;

Step 9: Add iron-carbon alloy particles 8 into the upper nozzle 9 and wait for tapping; complete the entire installation process.

Example 2

A ladle electromagnetic induction heating tapping device, as shown in Figure 1, includes a ladle wall 1 with a refractory material layer 2 inside and a first through hole at the bottom, and a second through hole in the center at the bottom of the inside of the ladle wall 1 The outer seat brick 10 is provided with the bottom refractory material layer 3 between the outer seat brick 10 and the ladle wall 1; the inner seat brick 11 embedded with the coil 4 is arranged inside the outer seat brick 10, and the inner seat brick 11 and the coil 4 are provided with a heat-insulating refractory material layer 12, and the coil 4 is connected to the quick junction box 5 through the connecting lead 6; a third through hole is provided in the first through hole at the bottom of the ladle wall 1 The maintenance flange 13, the second through hole is opposite to the third through hole, and the upper nozzle 9 with iron-carbon alloy particles 8 inside is arranged in the second through hole and the third through hole; the maintenance method The flange 13 is fixed on the bottom of the ladle by the bottom bolt 14, and an upper and lower sliding plate 7 with a nozzle 15 at the bottom is arranged below the maintenance flange 13, and the outer block 10 and the inner block 11 form a combined block.

After the ladle completes multiple times of induction heating and tapping, the induction coil 4 needs to be maintained and inspected, and the specific steps are as follows:

Step 1: Place the steel ladle that has completed multiple induction heating taps on the ladle tipping device;

Step 2: Start the hydraulic clamping device to clamp the ladle;

Step 3: Start the ladle tipping device and lay the ladle flat;

Step 4: Unscrew the bottom bolt 14 of the ladle with a wrench, and open the maintenance flange 13;

Step 5: remove the inner block 11 with the induction coil 4 and the heat-insulating refractory layer 12, and perform maintenance and inspection on the induction coil 4;

Step 6: Reinstall the induction coil 4 that has been maintained and inspected according to the steps described in Embodiment 1;

Step 7: Cover the maintenance flange 13 and tighten the bottom bolt 14 to complete the installation.

Claims (1)

1. The installation method of ladle electromagnetic induction heating tapping device is characterized in that, comprises the following steps: Step 1: Place the ladle to be installed with the induction coil on the ladle tipping device; Step 2: Start the hydraulic clamping device to clamp the ladle; Step 3: Start the ladle tipping device and lay the ladle flat; Step 4: Check whether the lead wire is damaged, and remove the connecting lead wire; Step 5: Use a wrench to unscrew the bottom bolt of the ladle to open the maintenance flange; Step 6: Install the inner block with the induction coil and heat-insulating refractory layer inside the outer block; Step 7: Cover the maintenance flange, tighten the bottom bolt, and connect the induction coil to the quick junction box with the lead wire; Step 8: Start the ladle tipping device and put the ladle upright; Step 9: Add iron-carbon alloy particles into the upper nozzle and wait for tapping; complete the entire installation process; The ladle electromagnetic induction heating tapping device includes a ladle wall with a refractory material layer inside and a first through hole at the bottom, a seat brick with a second through hole in the center is arranged at the bottom of the inner side of the ladle wall, and the seat brick and the ladle wall There is a bottom refractory material layer between them; an induction heating coil is embedded inside the seat brick, and a heat-insulating refractory material layer is arranged around the induction heating coil, and the coil is connected to the quick junction box through a connecting lead wire; A maintenance flange with a third through hole in the center is provided in the first through hole at the bottom, the second through hole is opposite to the third through hole, and a maintenance flange with a The upper nozzle of iron-carbon alloy particles; the maintenance flange is fixed on the bottom of the ladle through bottom bolts, and an upper and lower sliding plate with a water outlet at the bottom is arranged under the maintenance flange; the seat brick is made of an internal and external combined seat brick, and the induction heating coil The installation method belongs to the built-in type, which is installed inside the inner block of the ladle, and then the inner block is installed inside the outer block.

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