KR100383096B1 - Device for Putting in Open Tap of Tundish for Initial Casting Line - Google Patents

Abstract

The present invention relates to an apparatus for preventing clogging of an immersion nozzle during an initial casting operation, an open tab for preventing clogging of an immersion nozzle, and an open tab for storing the open tab and supplying the stored open tab separately. And an open tab insert for inserting the open tab into the wall block on the bottom of the tundish by allowing the open tab storage to be vertically moved up and down, so that the refractory fragments do not flow into the wall block, thus providing stable initial molten steel. The injection operation improves productivity and improves operator efficiency by injecting pure molten steel into the initial mold regardless of the preheating time or preheating temperature.

Description

Device for Putting in Open Tap of Tundish for Initial Casting Line}

The present invention relates to a tundish for continuous casting in a stainless steelmaking process, and more particularly, to an apparatus for preventing clogging of an immersion nozzle during an initial casting operation.

In general, a continuous casting machine is a facility for producing slabs of a certain size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle in a tundish and then supplying it to a mold. The tundish is a container that receives the molten steel from the ladle once between the ladle and the mold to rectify it regularly and discharge it into the mold.

In this continuous casting process, the initial casting operation in the tundish, first, when the hot molten steel is injected into the tundish, the temperature inside the tundish is cooled, so the temperature variation with the molten steel should be minimized.

To this end, preheating for about 3 hours before casting to maintain the inside of the tundish at about 1000 ~ 1200 ℃ to inject molten steel into the tundish.

Since the sliding gate, which is the exit to the mold, is always open at the beginning of casting, molten steel discharged from the tundish is initially used to secure molten steel of about 2 to 3 tons in the tundish to manufacture slabs of a predetermined size in the mold. After the molten steel is to be injected into the mold.

Hereinafter, a conventional initial casting operation will be described with reference to the accompanying drawings.

Figure 3 is a schematic diagram showing a tundish preheating state during a conventional initial casting operation, Figure 4 is a schematic diagram showing a conventional initial casting operation state.

As shown in Figure 3, in order to secure a molten steel of about 2 to 3 tons in the tundish 50 before the casting operation, using a mortar (52) on the wall block (51) above the wall block (51) (starting tube) 53 is firmly attached.

Then, in order to minimize the temperature deviation between the molten steel injected into the casting ladle and the tundish 50 having the starting tube 53 installed therein, the tundish preheater 61 is swing cylinder 62. After lowering by using a), the preheating port 58 of the tundish cover 57 is heated through the flame 63 for about 3 hours, thereby preheating the inside of the tundish 50 to about 1000 ~ 1200 ℃.

After the preheating operation as described above, as shown in FIG. 4, when the sliding gate 72 under the casting ladle 71 is opened, the molten steel 70 is injected into the tundish 50 through the intermediate tube 59. .

The injected molten steel 70 moves to the starting tube 53 inside the tundish 50 until the molten steel of about 2 to 3 tons is secured, and then the molten steel 70 gradually rises over the starting tube 53. While flowing, the molten steel 70 is injected into the mold 65 through the sliding gate 55 and the immersion nozzle 56 under the tundish 50.

However, when the initial casting operation according to the conventional technique, such as the maintenance work for the refractory construction in the tundish 50 after each operation in the preheating process of the tundish 50 and the tundish cover 57 is recycled Due to the frequent use of the tundish cover 57, the refractory pieces 75 of the tundish cover 57 are deteriorated during the preheating process and fall below the tundish 50.

Since the refractory fragment 75 has a specific gravity lower than that of the molten steel 70, the molten steel 70 rises to the top of the starting tube 53, and the refractory fragment 75 also floats like the molten steel 70.

At this time, the refractory fragment 75 having a low specific gravity overflows earlier than the molten steel 70 and blocks the sliding gate 55 under the tundish 50 so that the molten steel 70 is not injected into the mold 65. There may be situations where you need to stop.

On the other hand, even if the refractory pieces 75 of the tundish cover 57 does not fall, when the preheating time of the tundish 50 is longer than 3 hours or when the preheating temperature rises above 1300 ° C., the starting tube 53 made of steel is formed. Some melting occurs.

Therefore, when the molten steel 70 overflows the starting tube 53, the deteriorated molten starting tube 53 is deflected by the inflow force of the molten steel 70 to reduce the hole into which the molten steel 70 is injected. There is a problem that the molten steel 70 comes out fine and solidifies in the wall block 51 on the sliding gate 55 to be clogged.

In addition, the starting tube 53 has to be preheated to about 1200 ° C. for about 3 hours, so that the thickness of the starting tube 53 is about 3 mm thick.

Due to this, when the molten steel 70 in the tundish 50 is secured during the initial casting operation, the molten steel 70 is melted by itself. However, after a considerable time, the molten steel gradually melts, resulting in fine defects in the initial cast. , Mortar 52 for joining the starting tube 53 also has a problem that the quality of the initial cast.

Accordingly, the present invention is to solve the above problems, the object is to prevent clogging of the immersion nozzle during the initial casting operation, to provide a device that can work regardless of the tundish preheating temperature or the refractory pieces of the tundish cover. It is.

1 is a state diagram showing an initial casting operation state according to the present invention,

2 is a block diagram of an open tab insertion apparatus of the present invention,

Figure 3 is a schematic diagram showing a tundish preheating state in the early initial casting work,

Figure 4 is a schematic diagram showing a conventional initial casting operation state.

Explanation of symbols on the main parts of the drawings

10: open tap 12: open tap sealing joint

20: tap tube 21: tap stopper

30: tube rail 31: wire

33: wire heel 37: wire drum

40: rotation axis 50: tundish

51: wall block 53: starting tube

61: tundish preheater 65: mold

The present invention for achieving the above object,

An open tab for preventing clogging of the immersion nozzle, an open tab storage unit for supplying individually stored open tabs for storing the open tabs, and an open tab for vertically moving the open tab storage unit vertically. It consists of an open tap insert for insertion into the wall block on the bottom of the tundish.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1a and 1b is a state diagram showing the initial casting operation state according to the present invention, Figure 2 is a block diagram of the open-tab inserting apparatus of the present invention.

According to the drawings, the present invention is installed in the open tab storage unit and the two-storey work deck on the top of the tundish 50 can be stored separately and supply the open tab 10 vertically, the open tab storage vertically It consists of an open tab insert that enables movement.

First, the open tab 10 as shown in Figure 1 during the initial casting operation to secure a certain amount of molten steel inside the tundish, and serves to prevent the immersion nozzle is blocked by refractory pieces and the like.

To this end, an open tab body 11 made of metal having a thickness of about 0.2 mm in the form of an inverted conical bottom portion is formed, and a sealing joint 12 made of rubber is attached to the outside of the bottom surface of the open tab body 11. And, the size of the open tab 10 is manufactured to be the same as the molten steel inlet size inside the wall block (51).

Therefore, the rubber sealing joint 12 is melted by the preheated tundish 50 inside temperature and close to the wall block 51 so that the molten steel is secured for a predetermined time and the molten steel is the wall block 51. Do not infiltrate.

As shown in FIG. 2, the open tab storage unit includes a tab tube 20 for storing a plurality of open tabs 10 and a tab installed at the bottom of the tab tube 20 to supply open tabs 10 one by one. The stopper 21 and the cylinder 23 which drives the said tab stopper 21 are comprised.

The tap stopper 21 is connected to the cylinder 23 by a tab shaft 22 hinged to the outer wall of the tab tube 20, and the open tab 10 as shown in FIG. 1B by the extension operation of the cylinder 23. Make sure you supply one by one.

As shown in FIG. 2, the open tap inserting portion is vertically mounted on the two-layer work deck above the tundish 50, and the open tap storage portion is guided to the tube rail 30. The wire heel 33 is installed on the upper end of the tube rail 30, the motor 38 is provided with a wire drum 37 to enable the vertical movement of the open tab storage, and the wire heel, Supported by 33 is made of a wire 31 connected to the upper end of the tab tube 20 and the wire drum 37.

Here, the wire hill 33 is fixed to the wire hill fixing bar 32 installed on each of the two upper ends of the tube rail (30).

In addition, the motor 38 is installed on the driving device fixing bar 39 attached to the rear end of the tube rail 30 to rotate the wire drum 37.

In addition, one end of the wire 31 is installed on the upper end of the tab tube 20 and is fixed to the tab tube support 25 that is inserted into both of the two tube rails 30 and moves up and down vertically, and the other end of the wire drum 37 ), The tab tube 20 is vertically moved in accordance with the rotation of the wire drum 37.

On the other hand, the open tap insertion device is external to the preheated tundish 50, and in order to allow the open tab 10 to be inserted after the preheating is completed, the rotary shaft 40 to rotate the present invention in one embodiment ) Is rotated by connecting to the rotating shaft body (41).

Hereinafter will be described the operation of the present invention.

After the preheating of the tundish 50 is completed as shown in FIG. 3, the tundish preheater 61 is raised by using the swing cylinder 62, and then the present invention is inserted into the first preheater 58 of the tundish cover 57. Rotate the open tap insertion device to match the preheater 58 and the tab tube 20.

Then, when the motor 38 is driven, the wire drum 37 bound thereto is rotated to release the wire 31 and the tap tube 20 is lowered to the upper end of the wall block 51 as shown in FIG. 1A.

In addition, when the cylinder 23 is reduced and operated as shown in FIG. 1B, the tap stopper 21 connected to the tab shaft 22 moves downward while the open tab 10 in the tab tube 20 moves downward by its own weight. The open tap 10 falls into the wall block 51.

After the open tab 10 at the bottom part is inserted into the wall block 51, when the cylinder 23 is extended and operated, the tap stopper 21 is moved upward so that the tap tab 21 is positioned at the top of the wall block 51. Open tab 10 is prevented from coming out.

Then, in order to securely fix the open tab 10 inserted into the wall block 51, the motor 38 is driven in reverse and positive directions to raise and lower the tap tube 20 up and down about two or three times. .

At this time, the bottom surface of the tab stopper 21 presses the upper part of the open tab 10, so that the open tab 10 is firmly inserted into the wall block 51.

After fixing the open tap 10 inside the wall block 51, when the motor 38 is driven, the wire drum 37 rotates to wind the wire 31, and the tap tube 20 connected thereto is a tube rail ( While moving upward along the 30) it is moved out of the tundish 50.

After the insertion of the open tab 10 is completed, when molten steel is injected from the casting ladle, since the open tab 10 is cold, initially molten steel is not melted, and about 3 tons of molten steel is opened. When the upper portion is filled, the open tab 10 made of a thin iron plate material is melted in a moment by hot molten steel and molten steel is injected into the mold 65 through the immersion nozzle 56.

Then, as the initial casting operation proceeds smoothly, the remaining open tap 10 pieces in the wall block 51 are rapidly melted by the flow rates of the molten steel and the molten steel at a high temperature.

As described above, according to the apparatus for initiating the initial casting operation according to the present invention, since the refractory pieces are not introduced into the wall block, the productivity is improved by the stable initial molten steel injection operation, and only pure molten steel is initialized regardless of the preheating time or the preheating temperature. Injection into the mold improves operator efficiency.

In addition, it is possible to work regardless of the refractory pieces of the tundish cover, thereby extending the life of the tundish cover.

Claims (4)

In a tundish for continuous casting, An open tap installed in the upper part of the tundish to supply a piece of open tap to secure a certain amount of molten steel inside the tundish and prevent the blockage of the immersion nozzle, and to store the open tab separately. A turn, comprising: a storage unit and an open tap insertion unit installed at an upper position of the tundish to enable the open tab storage unit to be vertically moved up and down to insert the open tab into the wall block of the bottom of the tundish. Open tap dosing device for starting the initial casting of dishes. The turn tab according to claim 1, wherein the open tab comprises an open tab body made of metal having an inverted conical shape, and a sealing joint made of rubber attached to the outside of the bottom surface of the open tab body. Open tap dosing device for starting the initial casting of dishes. The method of claim 1, wherein the open tab storage unit comprises a tab tube for storing a plurality of open tabs, a tap stopper installed at the bottom of the tab tube for supplying open tabs one by one, and a cylinder for driving the tap stopper. Open tap input device for starting the initial casting of the tundish, characterized in that. According to claim 1, wherein the open tab insert is a tube rail vertically installed on the upper portion of the tundish, the wire tap is installed on the upper end of the tube rail to move vertically and vertically while the open tab storage is guided to the tube rail, Initial casting operation of the tundish, characterized in that consisting of a motor having a wire drum is installed to enable the vertical movement of the open tab storage, the wire is supported by the wire heel connected to the upper end of the tab tube and the wire drum Open tap dosing device for start-up.