JPS6099463A - Device for discharging molten metal - Google Patents

Abstract

PURPOSE:To prevent clogging of a passage hole even if the opening degree of the passage hole is small by providing a gas supply part in a specific range to the inside wall surface of the passage hole of the stationary plate on the side opposite from the moving direction of a slide plate while the passage hole is clogged. CONSTITUTION:The body of an upper stationary plate 21 formed of dense refractories is fitted with a semicircular gas supply body 24 consisting of porous refractories over the range of 1/3-2/3 the circumference on the inside wall surface of the plate 21. A semicircular gaseous pressure equalizing zone 25 is formed between both. A gas introducing hole 26 communicating with the zone 25 is formed to the plate 21 and a gas introducing pipe 27 is connected thereto.

Description

[Detailed description of the invention]

The present invention relates to the placement of molten metal at the bottom of a ladle or tumbler when casting molten metal. For example, if you want to pick up molten steel beforehand, then molten steel is 11? , Consisting of a holder 1 (5 or fixed to the nozzle at the bottom of the Kunpush) and a sliding board (a fusion head is attached,
By sliding the slide relative to the fixed plate, the molten steel passage hole is opened and closed, and the molten steel flow m is made to be a+, '1'. In the above-mentioned molten h1: metal JJI extraction device, solidification of the molten steel passage hole, AI, -
In order to prevent clogging due to metal oxides such as ri, ca, c1゛, and nickel, A is added from the fixed plate into the molten steel.
Supplying inert dregs such as I' is being carried out. Such a conventional molten metal discharge device will be explained with reference to FIG. In the figure, numeral 1 indicates an upper nozzle that passes through a molten metal passage hole fixed to the bottom of a tongue pusher (not shown). Below the upper nozzle 1, there is installed a molten metal discharge device consisting of an upper fixed plate 2, a slide plate 3, and a lower fixed plate 4 each having a passage hole for molten metal. The passage hole is opened and closed by sliding between the plate 2 and the lower fixed plate 4, and the flow m of molten steel is adjusted and the passage hole is completely closed. 3. The upper inner wall surface of the upper fixed plate 2 has a A scum supply body 5 made of porous refractory is placed around the circumference, and a scum equalizing band 6 is provided between the main body of the upper fixed plate 2. To (
A scrap introducing hole 7 is formed that communicates with the twisted uniform belt 6.
3. A hostage (not shown) is connected. (J immersion nozzle ε) is installed below the lower fixed plate 4 ()
The lower end of the immersion nozzle 8 is inserted into the mold 9. In the above device, molten steel in a tongue push (not shown) is sent to moldings 1 to 9 through passage holes in an upper nozzle 1, a lower fixed plate 2, a slide plate 3, an unfixed plate 4, and an immersion nozzle 8. Then, the mold 9 and its lower part are cooled. As a result, a molten layer 10, a semi-molten layer 11, and a 0-solidified layer 12 are formed inside the mold 9 and beyond. Also,
A mold powder 13 is provided on the molten layer 10. When using the device mentioned above for the purpose of facilitating the initial opening of the tundish, at the closing mouth of the passage hole before filling,
By supplying waste at a rate of 0 to 1507/min and preventing solidification in the volume 2, clogging of the passage hole is prevented. Ichibu J, due to the recent deterioration of multiple lines, the active loan + Jl exit neck has to be brought in for a long time < 300 to 600 minutes.

[Since it has to be removed, type 8 oxides are added to the wall surface of the i11 hole.
In order to reduce the flow of molten chains that are required even when attached, the cross section of the passage hole (h is required) d of the steel shape is 3°5~'1.5 (
T! J: There is a sea urchin set-C. And visit J
) The initial opening degree of the passage hole is set to 35% to 115%, and the flow rate of the molten steel is adjusted to perform so-called shedding. In this case, the amount of scrap supplied from the scrap feeder 5 into the molten steel is 3 to 151,1 n in. The reason why the supply of Nonozu is reduced in this way is because of II reasons such as those mentioned below. In other words, -1-1ffl 1 piece of molten metal + t + Since the extraction device is supplied with IL from the entire circumference of the passing hole, if the amount of gas is too large, the gas supply will be interrupted during the delivery. 1 co-supplied gas (yo(+18
11 and the inside of C mold 9 is also mixed in, and mold 1
- This is because the powder 13 is rolled in/υ, and the solid layer 12 (: dust) in the mold 9 generates bottle balls, which causes defective steel. When this happens, the flow of molten steel becomes extremely poor in the area surrounded by the top surface (quiet part) of the slide plate 3 and the inner wall surface of the upper fixed plate 2.For this reason, in any area where the gas supply amount is low, The heat is taken away by the molten steel or the surrounding refractories, and it is cooled down to semi-R sub!
: It becomes a t/S state, and there is also a disadvantage that 11 oxides are attached and it becomes easy to block. The present invention was made in view of the above-mentioned information, and is based on the following: Even when the opening degree of the passage hole is small, the melting α11. The aim is to provide metal emission purchasing services. Molten G11 Metal 1J1 Output U (through hole open chain IH) of the present invention
1/3 to 2 of the circumference on the inner wall surface of the fixed path passage hole on the opposite side to the direction of movement of the sliding plate in J>. ...In the range of '3, there is a scum (j). You can either hang the scum supply body 1 or 1 or form a small hole directly on the fixed plate. In addition, there are 0 scraps (for those made of porous refractories, slits for large-sized materials).
Surin 1 is applied to porous refractories with small pores formed.
~ or with small holes formed. In this way, attach the gas supply section to the inner wall surface of the fixed plate by 1/3 of the circumference.
~2. /3 range, the scum is concentratedly supplied to the area where the flow of molten steel is poor and effectively prevents the passage hole from clogging. It is important to prevent excessive leakage. d3, in this light, the area where the C1 body is installed is the circle of the fixed passage passage hole on the opposite side to the movement l'i direction of the sliding plate in the passage hole closing opening). 1' of circumference,
-'3 to 2/3'' is because if it is less than 1/73, the amount of waste supplied is small, so the effect of preventing the passage hole from clogging is small.
On the other hand, if it exceeds 2/3, excess gas tends to be drawn into the molding 1~ and becomes trapped in the defective steel. Hereinafter, embodiments of the present invention will be described with reference to FIG. 7A2 and FIG. Fig. 2 (J Upper fixing 5 each having a passage hole for molten metal)
) 321, a molten metal discharge device consisting of a slide plate 22 and a lower fixed plate 23). The main part of the upper fixed plate 21 is made of dense refractory material. At the center of the upper part of the lower fixed plate 21 is a porous 61 as shown in FIGS. 2 and 3.
One semi-circular arc-shaped gas supply lA 24 made of a large material is attached, and a semi-circular arc-shaped gas pressure equalization zone 25 is formed between the two. Additionally, a gas equalization zone 25 is provided on the upper fixed plate 21.
A gas introduction hole 26 communicating with is formed, and a waste introduction pipe 27 is connected to the gas introduction hole 26 . The above-mentioned molten metal discharging device is attached to an upper fixed plate 21 or, for example, an upper nozzle of a tongue tissue, in the same way as the 8 molten metal discharging devices shown in FIG. α1 nozzle hole (=J) is used in the lower part. However, according to the above-mentioned molten metal 1]1 pouring concave, when squeezing and pouring, the position where the passage hole is Since almost no gas is supplied, excessive gas is not drawn into the mold. Therefore, by increasing the amount of gas supplied, the upper surface (closed part) of the slide l' 122 and the upper fixed plate 2
In the area surrounded by the inner wall of No. 1 (ni), it is possible to stir more IW of i-7m, which effectively prevents the passage hole from clogging. 5 from the pot (11, AI 0゜0
35% aluminum killed finger is continuously injected
Continuous casting was performed on a 130t, 4-strand tongue tissue by incorporating the conventional molten metal discharge device and the molten metal discharge Ml of the above example into the upper nozzles of the two strands, respectively, and the following results were obtained. Ta. First, the passage hole of the molten metal discharge device was closed, and molten steel was injected into the kundishko from △1゛ scum to 1501/++ mounds (while blowing, pretending to take it!).The height of the molten steel in the kundishko was approximately Place the INN point, which is now 60 cm, through the passage hole of the molten metal discharge device, and reduce the Ar scrap supply amount to 301/
Adjust to min and pour molten steel for 7 pots/ν
Ta. At this time, in the conventional molten metal discharging device, the mold balata was entangled in the molten steel, causing a defective steel 1M, but in the molten metal discharging device of the above embodiment, no defective steel occurred. In the invention, when using a waste feeder, it is preferable to use a high-corrosion-resistant monthly feeder such as high alumina, maknesia, or zirconite.In addition, in the above explanation, the upper fixed plate and the slide plate are used. We have described a molten metal discharging device consisting of a fixed plate and a lower fixed plate. The immersed nozzles, etc., which are installed below each plate (t Furthermore, it goes without saying that the molten metal discharge device of the present invention can be installed not only at the bottom of a tongue tissue but also at the bottom of a ladle. As detailed above, according to the molten metal discharge device of the present invention,
8) It has remarkable effects such as being able to reliably prevent clogging of the passage hole for molten metal.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a state in which a conventional melting machine (metal discharge device is installed in a continuous casting view), and Fig. Cross-sectional view of the output device, 1
Figure 3 is a plan view of the lower fixed plate of the device. 21...Upper fixed plate, 22...Slide hall, 23...
- Lower fixed plate, 2/I... scum supply body, 25... scum equalizing zone, 26... scum introduction hole, 27... gas introduction envelope. Applicant's agent Ben 1! I! 10 Suzu (]'j Figure 1 Figure 2 Figure 9 Figure 3

Claims (1)

[Claims] A fixed plate attached to a nozzle at the bottom of a container that houses and covers molten metal has a sliding plate that opens and closes a fully bent passage hole for molten metal by sliding against this fixed plate. In the molten metal discharging device, when the passage hole is closed, a fixed plate is placed on the inner wall surface of the passage hole on the opposite side to the moving direction of the sliding plate in the range of 1/3 to 2/3 of the circumference. IH the gas supply section
I'm looking forward to what happened) when the loan was announced.