JPS62118967A - Nozzle opening and shutting device for molten steel vessel - Google Patents

Abstract

PURPOSE:To execute surely a start and stop of a molten steel pouring operation and a control of a pouring rate for a molten steel vessel by using a stopper holding rod having a specified construction for a vertical moving of the stopper, which opens and shuts a molten steel pouring nozzle arranged at the vessel bottom. CONSTITUTION:The molten steel in a tundish 1 of a continuous casting is poured into a mold for the continuous casting through a submerged nozzle 4. The start and stop of the molten steel pouring operation and the control of molten steel pouring rate are executed surely by the opening and shutting at the inlet of nozzle 2 by the stopper 6 head and by an adjustment of a gap between the nozzle and the stopper head. For this purpose, the upper end of the stopper 6 is coupled by a connecting arm 8 in parallel with the upper end of the stopper holding rod 7 operated by a operating handle 34 attached to the outside of the tundish through an eccentric rod guide 62. The stopper head is exactly positioned at the inlet of the nozzle 3, and the start and stop of the molten steel pouring operation and the control of pouring rate are freely executed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is directed to stopping the supply of molten steel from a molten steel container, for example, a tundish used in a JIX continuous casting machine, or controlling the amount of molten steel supplied. This invention relates to a nozzle opening/closing device for a molten steel container used for.

(Prior Art) Conventionally, when stopping the supply of molten steel from a tundish used in a molten steel container 1, for example, a continuous casting device, or controlling the amount of molten steel supplied, a nozzle provided at the bottom of the tundish is inserted into the tundish. One method is to open and close the nozzle using a stopper installed so that it can be raised and lowered from above the nozzle, and the other is to open and close the nozzle by installing a sliding nozzle on the bottom side of the nozzle.
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Among these, there are some structures in which the nozzle is opened and closed by a stopper, for example,
There is a structure in which the stopper is raised and lowered via a stopper holding rod connected substantially parallel to the stopper.

(Problems to be Solved by the Invention) As described above, in a structure in which the stopper is raised and lowered via a stopper holding rod connected substantially parallel to the stopper, the lower end of the stopper is In order to accurately open and close the 5-way contact, it is necessary to hold the stopper holding rod accurately and well, and if the stopper holding rod is eccentric or tilted, the lower end of the stopper will not hit the nozzle part accurately. However, there was a problem in that it became difficult to completely stop the flow of molten steel or to reliably control the flow rate of molten steel.

This invention has been made by focusing on the above-mentioned conventional problems, and it is possible to improve the accuracy of the contact position of the lower end of the stopper with respect to the nozzle provided at the bottom of the molten steel container, and to stop the molten steel supply or to stop the molten steel. It is an object of the present invention to provide a nozzle opening/closing device for a molten steel container that allows for good and reliable adjustment of the supply.

[Structure of the Invention JR,] (Seven Steps for Solving Problems) This invention provides a stopper that opens and closes a nozzle provided at the bottom of a molten steel container from the inside of the molten steel container, in a manner that is substantially in line with the stopper. The nozzle opening/closing device is movable up and down via connected stopper holding rods, and has a structure in which the stopper holding rod is positioned and held up and down via an eccentric front guide at the top portion of the stopper holding rod. It is characterized by what it did.

(Embodiment) The drawings are diagrams showing a nozzle opening/closing device for a molten steel container according to an embodiment of the present invention.

In the figure, reference numeral 1 is a tandish as a molten steel container, and a nozzle 2 is provided at the bottom of the tandish 1. The lower part of the nozzle brick 3 forming this nozzle 2 is molded as a immersion pipe 4. It extends below the cover 5.

aQ21L so that the lower end of the stopper 6 comes into contact with the nozzle 2, but in this case, the north end of the stopper 6 and
The stopper 6 is held by the stopper holding rod 7 by connecting the north end of the stopper holding rod 7 disposed outside the tundish 1 with the connecting arm 8, and the stopper 6 and the stopper holding rod 7 are It is connected in a state.

Further, the stopper 6 has an oxygen supply path 6a inside thereof and an oxygen nozzle 6b at its lower end, and allows oxygen to be supplied through the pipe 9 so as to prevent clogging of the nozzle 2.

On the other hand, to connect the stopper 60L end to the connecting arm 8, the stopper rod 12 fixed to the upper end of the stopper 6 with a nut 11 is inserted into the notch 8a of the connecting arm 8, and the upper and lower ribs 13 and 14 are connected with washers. This is done by tightening.

On the other hand, the connecting rod 8 and the stopper holding rod 7
The connection is made by inserting a connecting rod 16 provided at the upper end of the stopper holding rod 7 into the notch 8b of the connecting rod 8 and tightening a nut 17.

In this case, the reinforcing plate/spacer 18. The connection is further strengthened by the port 19a and the nut 19b, and the height of the stopper 6 is determined.

Further, almost the entire side surface of the stopper holding rod 7 is covered by the rod casing 20, except for the middle portion in the downward direction of the hill on the left side in FIG. 1 (the front side f in FIG. 2). On the r side of the rod casing 20, as shown in FIG. 4, there are attached a bracket 21.21 and a reinforcing plate 22.
22 is fixed, and this bracket 21.21 is connected to a support bracket 22.2 provided on the side of the tundish 1.
It is placed on a support rod 23 extending between the two.

A lower block 25 is fixed to the lower end side of the rod casing 2o, and a thin wall portion 26 of the ring member 26 is disposed between the lower block 25 and the stopper holding rod 7.
A T-shaped screw 27 screwed into the lower block 25 is tightened into the groove 26b of the thin wall portion 26a to prevent the ring member 26 from moving downward.

A segment gear holding bracket 31 is fixed to the side surface of the ring member 26, and a segment gear 33 is pivotally supported on the segment gear holding bracket 31 via a support shaft 32. An operating handle 34 is fixed to this segment gear 33, and a gear portion 33a of the segment gear 33 meshes with a gear 7a formed at the intermediate portion of the stopper holding rod 7.

Further, a leg bracket) 35.35 is fixed to the bottom side of the lower block 25, and this leg bracket) 3
A lower eccentric roller 37.37 as an eccentric rod guide is attached to the roller shaft 36 which extends between 5.35 and 35, and the lower part of the stopper holding rod 7 is held by the inner lower eccentric roller 37.37. There is.

On the other hand, on the upper side of the rod casing 20, an enclosing bracket 42 that is engaged with a casing support member 41 provided on the upper part of the tundish 1 is provided. The upper side of the rod casing 20 is held by bringing it into contact with the rod casing 20.
Small block 4 on the tundish 1 side of the casing 20
5 is fixed, and by bringing the male screw 46 screwed into the small block 45 into contact with the casing support member 41, vertical movement of the rod casing 20 is prevented.

Furthermore, on the upper part of the stopper holding rod 7, guide plates 51, 52.
53 is fixed by welding, and each guide plate 51, 52, 53
Upper eccentric rollers 61 as eccentric rod guides are attached to the three sides of the rod casing 20, respectively.
, 61°, 62.62, and 63.63 are the contact points. Each of these upper eccentric rollers 61, 62, 63 is attached to a roller support member 65 shown in FIG. That is, this roller support member 65 is mounted so that its rotation center P and the center R of the upper eccentric rollers 61, 62, 63 are shifted by Δd.

Therefore, by rotating the roller support member 65 about its rotation center P and fixing it by screwing a bolt (not shown) inserted into the long hole 65a into the rod casing 20 side, each of the two-part eccentric rollers 61 and 61 can be fixed. .62 and 62.
In addition to being able to adjust the spacing (gap) between the guide plates 51, 52, and 53, it is also possible to slightly move the holding positions of the guide plates 51, 52, and 53 in the horizontal direction.

Furthermore, the holding of the stopper holding rod 7 via the roller support member 65 of the upper eccentric rollers 61, 62° 63 also applies to the attachment of the lower eccentric rollers 37, 37 that hold the lower side of the stopper holding rod 7. The upper and lower parts of the stopper holding rod 7 can be held by eccentric rollers 37°61,62,63 (eccentric rod guides).

Furthermore, a connecting arm 65 is fixed to the lower end of the stopper holding rod 7 with a nut 66, and the connecting arm 65. The stopper 6 is raised and lowered via a stopper holding rod 7 and a connecting rod 8.

Therefore, the lower end position of the stopper 6 can be adjusted.

Each eccentric roller 27 forming the eccentric lower guide
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Ih5+bm=gusset This can be easily done by adjusting with the k4 member 657. In addition, 711 between the stopper 6 and the stopper holding rod 7
I interval is a long hole 8a formed in the connecting rod 8,
This can be easily done using 8b.

In addition, in the above embodiment, the upper and lower eccentric rod guides (37
, 61, 62, 63) are rollers, but
It does not necessarily have to be in the shape of a roller; for example, it may be in the shape of a semicircle or a fan.

[Effects of XA Ming] As explained above, the nozzle opening/closing device for a molten steel container according to the present invention has a stopper that opens and closes a nozzle provided at the bottom of the molten steel container from the inside of the molten steel container, and the stopper is arranged substantially parallel to the stopper. The nozzle opening/closing device is movable up and down via a stopper holding rod connected to the nozzle, and the stopper holding rod is positioned and held at the upper and lower parts of the stopper holding rod via an eccentric rod guide so as to be able to move up and down. It is possible to eliminate the play between the stopper holding rod and the eccentric rod guide, and it is possible to significantly improve the accuracy of the contact position of the lower end of the stopper with respect to the nozzle provided at the bottom of the molten steel container. , it is possible to reliably transmit the movement of the stopper drive device to the stopper, and the very excellent effect of being able to stop the molten steel supply or adjust the molten steel supply amount extremely well is brought about. .

[Brief explanation of drawings]

1, 2 and 3 are respectively a vertical cross-sectional explanatory view, a side explanatory view and a plan explanatory view in the direction of line A-A in FIG.
4 is an explanatory cross-sectional view taken along line B--B in FIG. 1, FIG. 5 is an explanatory cross-sectional view taken along line C-C in FIG. 2, and FIG. 6 is an explanatory view of the eccentric rod guide. DESCRIPTION OF SYMBOLS 1... Molten steel container (tandish), 2... Nozzle, 6... Stopper, 7... Stopper holding loft, 37... Eccentric rod guide (lower eccentric roller), 61
．． 62.63...Eccentric rod guide (upper eccentric roller).

Claims (1)

[Claims] (1) A nozzle opening/closing device in which a stopper for opening and closing a nozzle provided at the bottom of a molten steel container from the inside of the molten steel container can be raised and lowered via a stopper holding rod connected substantially parallel to the stopper, the stopper holding rod,
1. A nozzle opening/closing device for a molten steel container, characterized in that the stopper holding rod is positioned and held in upper and lower portions thereof via an eccentric rod guide so as to be movable up and down.