JPH089091B2 - Method and apparatus for hot recycling of tundish for continuous casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a hot-recycling method and apparatus for a continuous casting tundish suitable for a two-strand and large-capacity tundish.

<Prior art> In the conventional continuous casting, in order to discharge the residual steel and residue in the tundish and repair the refractory material, etc. each time the casting is completed
The tundish had to be moved from the pouring position, cooled, repaired and then reheated again, which was an uneconomical process.

If the tundish needs to be replaced to improve such an uneconomical process, or if the tundish is once emptied and reused, the tundish is tilted with the tundish car, or the tundish Cars that give the car the ability to tilt the tundish have come into use.

As the latter type, for example, in JP-A-49-101228, the tundish is rapidly tilted immediately before the end of casting to discharge the residual steel and the dregs in the tundish, and immediately thereafter the tundish is in-situ. The tundish is mounted on a tundish car equipped with a tundish tilting device and the front wall of the tundish is molten steel. Has a special shape to facilitate the outflow of molten steel, and a tundish washing table is installed close to the casting floor so that molten steel that agglomerates in the tundish nozzle etc. can be quickly removed even when the casting temperature is low. What has been done is disclosed.

<Problems to be Solved by the Invention> However, since the former means tilts the tundish together with the tundish car, when it is applied to a large tundish, the tilting device becomes extremely large and enormous equipment cost is required. become.

The latter means is a good means when the tundish is small in a one-strand continuous casting machine, but in the case of a two-strand and large-capacity tundish, the tundish car is equipped with a complicated and large-scale tundish tilting device. It must be done and it is not a good idea.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a method and an apparatus for hot recycle use of a continuous casting tundish suitable for a two-strand and large-capacity tundish. .

<Means for Solving the Problem> The method of the present invention for achieving the above-mentioned object, when the tundish mounted on the tundish car is hot-recycled between the pouring position and the preheating position, The tundish set at the pouring position on the tundish car is lifted and separated, and after moving from the pouring position to the preheating position together with the tundish car, the tundish is lowered to remove the tundish. The support shaft fixed to the outlet side is deposited in the tilting pedestal installed at the preheating position, and the tundish is tilted so that the discharge port side is directed downward by the tilting drive device with the tilting cradle as a fulcrum. The tundish car is separated from the tundish and supported, and the tundish is preheated while discharging the residual steel and residue in the tundish from the discharge port, At the stage of recycling and using the tundish which has been preheated, the tundish is returned from the tilted state to the horizontal state by the tilting drive device as a fulcrum and mounted on the tundish car, and the tundish is After raising and separating the outlet side from the tilting cradle, the tundish is moved to the pouring position together with the tundish car for recycling and hot recycling of the continuous casting tundish. Is the way.

Further, the apparatus of the present invention has a tundish whose plane is formed in a Y shape or a V shape so that the residual steel and the slag are concentrated on the discharge port provided in the tilting direction, and the tundish is placed on the tundish. For supporting the tundish supporting frame, a tundish car equipped with the tundish supporting frame so that the tundish supporting frame can be moved up and down, and for supporting the supporting shaft provided at the tundish preheating position on the outlet side of the tundish by depositing and supporting it. It is mounted on a cradle and a holding frame installed at a position facing the discharge port of the tundish, and the lifting hands provided on both sides of the tundish are towed by rod-shaped hanger having a hook at the tip. And a tilting drive device for tilting the tundish car separately from the supporting frame, and tilting the tundish to discharge residual steel and residue from the discharge port. A hot recycled apparatus tundish for continuous casting characterized by being configured to preheat with.

<Examples> Hereinafter, the configuration and operation of the present invention will be described in detail based on Examples.

In FIG. 1 and FIG. 2, 1 is a tundish, and the tundish 1 is a discharge port 2 provided in a tilting direction.
The flat surface is formed in a Y shape because the residual steel and the slag easily concentrate. Such a Y-shaped tundish 1 is mounted on and supported by a tundish support frame 3.
Tundish support frame 3 is tundish car 4
It is equipped so that it can be lifted and lowered via a cylinder rod type lifting device 5. A support shaft 6 is fixed to the discharge port 2 side of the tundish 1, and a hanger 7 is fixed to both ends. The tundish car 4 travels on the track 12 via the wheels 11 and moves to the pouring position and the preheating position.

At a preheating position of the tundish 1, a tilting pedestal 8 for depositing a support shaft 6 fixed to the discharge port 2 side of the tundish 1 is installed on the floor. Further, a holding frame 9 is installed at a position facing the outlet 2 of the tundish 1, and the tundish supporting frame is pulled on the holding frame 9 by pulling the hangers 7 fixed to both sides of the tundish 1. A tilting drive device 10 for tilting while being separated from 3 is mounted.

The tilting drive device 10 mounted on the holding frame 9 is provided with a lock-shaped suspending tool 14 having a hook 13 at the tip end corresponding to the lifters 7 fixed to both sides of the tundish 1. Has been done. Each rod-shaped suspending tool 14 is held by a suspending tool holder 17 supported via a shaft 16 on a bearing stand 15 provided on the supporting stand 9, and the suspending tool holder 17 is arranged on the stand 9. The lifting tool tilting cylinder 18 allows tilting.

While a rack 19 is fixedly installed on the lower surface side of each rod-shaped suspending tool 14, a suspending tool holder 17 is provided with a pinion 20 that meshes with the rack 19, and the rack 19 is rotated by rotating the pinion 20 normally or reversely. The rod-shaped hanger 14 can be extended and contracted from the hanger holder 17 via the. The rod-shaped suspending tool 14 is expanded and contracted while being guided by the guide roller 21 arranged in the suspender holder 17. As shown in FIG. 2, the shaft 22 connected to the pinion 20 is connected to the electric motor 25 via intermediate shafts 23 and 24.

Next, the operation procedure of the present invention will be described. As shown in FIG. 3, molten steel injection from the ladle 27 placed on the swing tower 26 to the tundish 1 set at the pouring position is completed, and the tundish is further transferred. Dish 1 to mold (not shown)
The molten steel is allowed to remain in the tundish 1 together with the slag so that the slag is not mixed into the molten steel that is cast into, and the sliding nozzle is closed.

Since the tundish 1 set at the pouring position has contracted the cylinder rod type lifting device 5 mounted on the tundish car 4 and lowered to the lower limit, as shown in FIG. 4 (a). The cylinder rod type lifting device 5 is extended to raise the tundish 1 together with the support frame 3 to the upper limit.

With the tundish 1 still raised, the tundish car 4 on the track 12 is moved to one of the left and right tundish preheating positions in FIG. 3, for example, the right preheating position, and the tundish 1 discharge port 2 side. Tilting pedestal 8 in which the support shaft 6 fixedly mounted on the floor is placed on the floor in the preheating position.
Align above.

Further, as shown in FIG. 4 (b), the cylinder rod type lifting device 5 is contracted to lower the tundish 1 and the supporting shaft 6 is deposited on the tilt receiving base 8. Then, as shown in FIG. 4 (c), the hanging hand 7 fixedly installed on both sides of the tundish 1.
The hook 13 provided at the tip of the rod-shaped hanger 14 is hooked and pulled, and the tundish 1 is inclined so that the discharge port 2 side faces downward with the support shaft 6 supported by the tilting support 8 as a fulcrum. Turn over.

At this time, tundish 1 is tundish car 4
The tundish car 4 on the track 12 becomes free as shown in FIG. 4 (d) because the tundish car 4 is separated from the supporting frame 3, and the tundish car 4 can be used for transporting another tundish for casting. It will be possible.

It should be noted that although the residual steel and the debris are discharged from the discharge port 2 of the tundish 1 held in the tilted state to the pot 28, the tundish 1 is preheated by a burner (not shown) equipped in the preheating device. Since the preheating device is an ordinary one and the preheating operation is performed in a usual manner, the description thereof is omitted here.

Here, after depositing the support shaft 6 of the tundish 1 mounted on the tundish car 4 in the tilting pedestal 8 according to FIGS. 1 and 2, the tundish 1 is operated by operating the rod-shaped suspending tool 14. The procedure for tilting the will be described.

First, the cylinder 18 for tilting the hoisting gear is operated to operate the rod-shaped hoisting gear.
The angle of 14 is adjusted and the hook 13 at the tip is rotated upward. Next, the electric motor 25 is driven to rotate the pinion 20 counterclockwise in FIG. 1 via the intermediate shafts 23, 24 and the shaft 22, and the rod-shaped suspending tool 14 is extended forward via the rack 19 to hook the hook 13 Is moved to a position above the hanging hand 7 of the tundish 1 as shown by the chain double-dashed line in FIG.

Further, the hoisting tool tilting cylinder 18 is operated to rotate the hook 13 downward as shown by the arrow, and subsequently the electric motor 25 is driven to rotate the pinion 25 in the clockwise direction so that the rod-shaped hoisting tool 14 via the rack 19. After the hook 13 is hooked on the hanger 7 fixed to the tundish 1 by pulling the tundish backward, when the tundish 1 is pulled, the support shaft 6 deposited on the tilting cradle 8 is drawn as indicated by the chain double-dashed line. The tilt as a fulcrum is as described above.

When the preheating of the tundish 1 is completed by keeping the tilted state, the empty tundish car 4 is moved to the preheating position and made to stand by, and the rod-shaped suspension 14
First, the tundish 1 is returned to the horizontal state from the tilted state and placed on the support frame 3 of the tundish car 4. Next, the cylinder rod type lifting device 5 is extended to raise the tundish 1 to the upper limit, and the supporting shaft 6 is separated above the tilting pedestal 8. Then, the tundish car 4 is used to lift the tundish 1. Move to the pouring position and prepare for the next molten steel injection start.

In the above-described embodiment, the pinion rack mechanism or the like is used as the means for moving the rod-shaped suspension forward and backward, but the tundish tilting drive device is not limited to that in the embodiment. Although the tundish having a Y-shaped planar shape has been described, a V-shaped shape is also suitable as a shape that easily collects residual steel and debris on the discharge port side when tilted, and the same effect can be obtained. .

<Advantages of the Invention> As described above, according to the present invention, not only can it be applied to a large-capacity tundish of two strands without requiring complicated and large-scale equipment, but the residue from the tundish can also be used. Good discharge of steel and residue and preheating can be done without any problems. As a result, the refractory cost of the tundish can be reduced to about 1/6 of the conventional one, and the number of pouring pans per tundish can be significantly increased from the conventional 2.5 to about 15.

Further, during the tundish preheating, the tundish car is separated and free, so that it can be used for another tundish and the reduction of the equipment cost can be achieved.

[Brief description of drawings]

1 and 2 are a side view and a plan view of an apparatus according to an embodiment of the present invention, FIG. 3 is a plan view showing the arrangement of the apparatus according to the present invention, and FIG. 4 is an explanation showing an operating procedure of the present invention. It is a figure. 1 ... Tundish, 2 ... Discharge port, 3 ... Tundish support frame, 4 ... Tundish car, 5 ... Cylinder rod type lifting device, 6 ... Support shaft, 7 ... Lifter, 8 ... … Tilt cradle, 9 …… Holding stand, 10 …… Tilt drive device, 11 …… Wheels, 12 …… Track, 13 …… Hook, 14 …… Rod-like hanger, 15 …… Bearing stand, 16 …… Axis, 17 …… Suspension holder, 18 …… Climb for tilting suspension, 19 …… Rack, 20 …… Pinion, 21 …… Guide roller, 22 …… Shaft, 23,24 …… Intermediate shaft, 25 ...... Electric motor, 26 …… Swing tower, 27 …… Ladle, 28 …… Pot.

Claims (2)

[Claims] 1. When the tundish mounted on a tundish car is used for hot recycling between a pouring position and a preheating position, the tundish set at the pouring position on the tundish car is raised. Then, the tundish is moved from the pouring position to the preheating position together with the tundish car, and then the tundish is lowered so that the supporting shaft fixed to the discharge side of the tundish is installed at the preheating position. The tundish is deposited on a table and tilted with the tilting cradle as a fulcrum so that the discharge port side is directed downward by a tilting drive device, and the tundish is supported separately from the tundish car, and the residual steel in the tundish At the stage of preheating the tundish while discharging the residue from the discharge port and recycling the tundish after the preheating, By using the tilting drive device, the tundish is returned horizontally from the tilted state with the tilting pedestal as a fulcrum and mounted on the tundish car, and the tundish is raised to separate the discharge side from the tilting pedestal. After that, the tundish is moved to the casting position together with the tundish car for recycling, and the tundish for continuous casting is used for hot recycling. 2. A tundish whose plane is formed in a Y shape or a V shape so that residual steel and debris are concentrated on a discharge port provided in a tilting direction, and a tundish on which the tundish is mounted and supported. A dish support frame, a tundish car equipped with the tundish support frame so that the tundish support frame can be moved up and down, and a tilting cradle for depositing and supporting a support shaft provided at a tundish preheating position and provided on the discharge side of the tundish. The tundish is mounted on a holding frame installed at a position facing the discharge port of the tundish, and the hanging hands provided on both sides of the tundish are pulled by rod-shaped hangers having hooks at the tip end thereof to the tundish. The tundish is tilted separately from the supporting frame of the dish car and tilted to tilt the tundish to discharge residual steel and debris from the discharge port. Hot recycled apparatus tundish for continuous casting characterized by being configured to.