KR19990020585U - Filler prevention device in mold - Google Patents

Abstract

After the molten steel in the ladle flows into the tundish, the filler is introduced into the upper portion of the nozzle under the tundish, the molten steel is injected and the molten steel is stabilized. Then, the molten steel and the filler are opened by opening the nozzle under the tundish. In the continuous casting machine flowing into the mold, a fastener is formed in a tundish car located below the tundish, horizontally installs a rotating arm inserted and rotated in the fastener, and a filler plug insertion groove is formed at an end of the rotary arm. The eggplant may be mounted to the filler cup, and a lower cover capable of opening and closing the lower portion of the pillar cup at the lower portion of the pillar cup may be installed at the lower portion of the pillar cup to prevent the filler from flowing into the mold. It is about my filler inflow prevention apparatus.

Description

Filler prevention device in mold

The present invention relates to a filler inflow prevention device in a mold, and more particularly, to a filler inflow prevention device for preventing a filler introduced into a tundish nozzle from flowing into a mold in a continuous billet casting.

In general, continuous casting method means that casting, molding, cracking, and cracking of ingot cases are omitted and the molten steel is directly injected into the mold and cooled and solidified as compared to the method of making slabs or blooms through ingot rolling in conventional ingots. It is a method for producing slabs, blooms, billets and the like. The continuous casting facility is a method of continuously producing molten steel injected from above and solidifying into the cross-sectional shape of the mold as it flows down through the mold. The molten steel, which has been precisely adjusted to the temperature, is transferred to a column of the machine by a ladle, and then injected into a tundish, an intermediate container. In tundish, molten steel is injected into the mold while floating the separation of molten steel. Here, the mold is injected into several strands again, and the mold is passed through the cooling water so that the molten steel inside is gradually solidified. On the other hand, the tundish is very disadvantageous in terms of molten steel control and temperature management when the molten steel is injected directly from the ladle when the molten steel is injected into the mold. Therefore, it is common to install a container that receives the molten steel from the ladle and makes the molten steel safe and then sends it to the mold. This is called tundish.

Figure 1 (a) is a schematic diagram of the operation of injecting molten steel into the tundish in the ladle after the filler is injected into the tundish nozzle, Figure 1 (b) is a molten steel in the mold by removing the filler plug after starting the molten steel in the tundish As a schematic diagram of the initiation operation, the tundish nozzle is an open nozzle in billet continuous casting. As shown, before the start of injection of the molten steel M into the tundish 10 from the ladle 14, the lower part of the nozzle 12 is blocked with the filler plug 13, and the filler is introduced into the upper part. At this time, the reason for introducing the filler F into the upper portion of the filler plug 13 is to prevent the filler plug 13 from being melted by the molten steel M so that the molten steel M immediately falls downward. Therefore, the component of the filler (F) is composed of a component that is not melted by the molten steel (M), for example, a material mixed with sand and carbon may be used. When the filler plug 13 is removed when the molten steel M is injected into the mold 11 after the molten steel M is injected into the tundish 10, the filler injected into the nozzle 12 falls out of the mold ( 11) As it is introduced into the molten steel (M) is injected.

Conventionally, when the filler F is introduced into the mold 11 and the molten steel M is injected when the molten steel M is injected into the mold 11 as described above, the molten steel M is floated in the mold 11 to float outward. When mixed, there is a risk of breakout due to poor surface formation. Here, the "break out" refers to an accident in which molten steel in the mold 11 leaks to the installation side, and molten steel and the equipment are welded while foreign substances are introduced and torn on the solidification surface. In addition, there is a problem in that the filler (F) to form a pin-hole (pin holl) or inclusions in the form of the inside of the slab to cause a defect of the product.

The present invention is to solve the above problems, by preventing the inflow of the filler when the initial molten steel is injected into the mold to prevent the break-out due to the poor surface formation of the cast during the initial injection operation to prevent equipment accidents, pinholes present inside the cast It is an object of the present invention to provide a filler inflow device in the mold, which can prevent the formation of excess and inclusions.

The present invention for achieving the above object is introduced into the tundish after the molten steel in the ladle, the filler is introduced into the upper nozzle of the lower tundish, injecting molten steel and stabilizing the molten steel, and then the nozzle of the lower tundish In the continuous casting machine to open the molten steel and the filler into the mold, to form a fastener in the tundish car located in the lower portion of the tundish, horizontally install the rotating arm inserted into the fixture to rotate, A filler cup having a filler plug insertion groove is mounted at an end portion, and a lower cover that can open and close the lower portion of the pillar cup at the lower portion of the pillar cup is installed at the lower portion of the filler cup to prevent the filler from flowing into the mold. It can be achieved by the in-mold filler inflow prevention device characterized in that.

Figure 1 (a) is a schematic diagram of the operation of injecting molten steel into the tundish in the ladle after the filler in the tundish nozzle.

Figure 1 (b) is a schematic view of the start of molten steel injection into the mold by removing the filler plug after the start of molten steel injection into the tundish.

Figure 2 (a) is an exploded perspective view of the filler inflow prevention device in the mold according to the present invention.

Figure 2 (b) is a front view of the in-mold filler inflow prevention device according to the present invention.

3 (a) and 3 (b) is a plan view showing a state in which the in-mold filler inflow prevention device according to the present invention is operated.

4 is a front view of a state in which a filler inflow preventing device of the present invention is installed in a billet continuous address facility;

(Explanation of symbols for the main parts of the drawing)

10: tundish 11: mold

12: nozzle 13: filler plug

14: ladle M: molten steel

F: Filler 20: Filler Cup

21: Filler plug insertion groove 22: Lower cover

23: vertical bar 24: lower cover fixing stopper

25: lower cover fixture 26: rotary arm

27: connecting device 28: rotating part

29: Swivel ring 30: Filler cup fixing key

31: key holder 32: fixture

33: Tundish

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

Figure 2 (a) is an exploded perspective view of the in-mold filler inflow prevention device according to the present invention, Figure 2 (b) is a front view of the in-mold filler inflow prevention device according to the present invention, the present invention is a tundish car 33 Is formed in the fixture 32, the rotary arm, the connecting device, the filler cup, the lower cover.

Grooves are formed in the upper portion of the fixture 32. The rotating arm has a rotating portion at one end, the rotating portion 28 is inserted into the groove of the fixture 32 described above is rotated. On the other hand, the rotation ring 29 is fixed to one side end of the rotary arm (26). In addition, the c-shaped pill cup fixing key 30 is fixed to the rotary arm 26 to fix the pillar cup 20.

The filler cup 20 is made of a pipe, and a filler plug insertion groove 21 is formed at one upper end thereof. In addition, the key holder 31 is horizontally fixed to one side. The lower cover 22 is rotatably mounted to the lower portion of the above-described filler cup 20, and the fixing stopper 24 is formed to protrude horizontally at one end. On the other hand, the plate is protruded horizontally on the opposite side of the fixing stopper 24 of the lower cover 22, the vertical bar 23 is fixed vertically on the upper portion of the plate, and the threaded portion is formed on the vertical bar 23. have.

The connection device 27 is mounted between the rotary arm 26 and the filler cup 20 described above to couple the rotating box 26 and the filler cup 20. A male screw (not shown) is formed at the end of the rotary arm 26 that is coupled to the connecting device 27. The male screw portion is made in the form of a socket but is coupled to the nut portion 27a of the connecting device having a female screw portion therein. On the other hand, the upper portion of the filler cup 20 is also fixed by fastening to the nut portion (27a) of the connecting device.

Hereinafter, the operation and function of the present invention will be described.

3 (a) and 3 (b) is a plan view showing a state in which the in-mold filler inflow prevention device according to the present invention is operated, Figure 4 is a filler inlet prevention device in the mold of the present invention is installed in the billet continuous address equipment As a front view of a state, the filler F is injected into the tundish 10 nozzle 12 before the start of injecting molten steel M into the tundish in the ladle 14. At this time, the filler cup 20 is prepared in the mold 11 position, the filler plug 13 is inserted into the nozzle 12, and then the filler is introduced.

When the filler plug 13 is removed when the molten steel M of the tundish 10 is to be injected into the mold, the filler F flows out and flows into the filler cup 20. When the molten steel (M) starts to flow out by pushing the rotary ring 29 installed on the rotary arm 26 by the filler plug 13 to rotate the arm 26, the filler cup 20 is out of the top of the mold 11, Molten steel M is injected into the mold 11.

When the injection of the molten steel is completed, the lower cover 22 is rotated, the filler and a small amount of the inside of the filler cup 20 are removed to the bottom, and the lower cover 22 is returned to its original position. If repair or replacement is necessary due to damage to the filler cup, the connector 27 may be dismantled to separate or repair the filler cup 20.

By devising the initial molten steel into the mold according to the present invention, it is possible to improve productivity by preventing the break-out due to poor surface formation of cast steel during initial injection work by preventing filler inflow. It prevents the formation and has an excellent effect of producing high quality billet cast steel.

Claims (1)

After the molten steel in the ladle flows into the tundish, the filler is introduced into the upper part of the nozzle under the tundish, the molten steel is injected and the molten steel is stabilized. Then, the molten steel and the filler are introduced into the mold by opening the nozzle in the lower tundish. In continuous casting machine, A filler cup is formed in a tundish car positioned below the tundish, horizontally installs a rotary arm inserted into the fixture and rotates, and a filler cup having a filler plug insertion groove at an end of the rotary arm and forming a container. And a lower cover capable of opening and closing the lower portion of the pillar cup at the lower portion of the pillar cup to the lower portion of the pillar cup to prevent the filler from flowing into the mold. Prevention device.