JPH06297115A - Device for controlling stopper for pouring nozzle in continuous casting tundish - Google Patents

Abstract

PURPOSE:To improve the workability by combining a lifting driving device, advance/retreat driving device and rotary driving device to a stopper which is arranged at the bottom part of a tundish and opens/closes a pouring nozzle. CONSTITUTION:In this control device, a rotary post 3 arranged so as to be freely rotated with a driving device 6 on a casting floor 2 independently near the continuous casting tundish 1 and a horizontal guide frame 7 arranged at the upper part of this rotary post, are provided. Further, a swing frame 9 supported so as to be freely advanced/retreated with this horizontal frame 7, a perpendicular guide frame 13 arranged at the tip part of this swing frame 9 and a lifting frame 15 arranged so as to be freely lifted while guiding with this perpendicular guide frame 13, are arranged. Then, the stopper 22 perpendicularly supported through a fine adjusting lifting device 21 fitted to this lifting frame is provided. By this constitution, as the stopper and this control device are separated from the tundish 1, the tundish 1 is made compact and the equipment cost is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper position control device for an injection nozzle in a continuous casting tundish which can make the continuous casting tundish as compact as possible and improve workability.

[0002]

2. Description of the Related Art A continuous casting tundish is an intermediate container for injecting molten metal received from a ladle into a mold, and an injection nozzle is a refractory cylindrical type having a nozzle hole attached to the bottom of the tundish. It is also called the upper nozzle. A sliding nozzle device and a stopper nozzle device are used as devices for controlling the injection amount of molten metal from such a tundish injection nozzle.

The sliding nozzle device is a combination of a fixed plate and a slide plate. The slide plate is slid by hydraulic pressure or electric power, and the opening of the pouring hole formed in the plate is adjusted to control the outflow amount of the molten metal. Control. On the other hand, the stopper nozzle device is a combination of a rod-shaped stopper and an upper nozzle, and a lifting device is used to move the stopper up and down to adjust the gap between the stopper and the upper nozzle to control the amount of molten metal poured out.

Normally, when pouring molten steel from a tundish or ladle equipped with a sliding nozzle device at the bottom, as shown in FIG. 3, the molten steel is poured into the tundish 1a in order to prevent initial clogging of the pouring nozzle 23. Prior to the steel, the pouring outlet of the fixed plate 27 is closed by the slide plate 28 of the sliding nozzle device 26, and the filling nozzle 23 is filled with the filling sand 23a such as silica sand to improve the opening rate of the sliding nozzle device 26. There is.

When the sliding nozzle device 26 is opened after receiving the steel in the tundish 1a, the filling sand 23a is cast into the mold (not shown) together with the molten steel, so that the non-metallic inclusions in the initial slab are increased and internal defects are generated. Cause to occur. Normally, the sliding nozzle device 26 of the tundish 1a is opened so that the filling sand 23a is not put in the mold.
After the molten steel containing is discharged into a container (not shown) made of cast steel or cast iron, the sliding nozzle device 26 is immediately closed and moved onto the tundish 1a, and then the sliding nozzle device 26 is opened to transfer the tundish 1a to the mold. The method of casting molten steel is used.

[0006] In the method of discharging molten steel containing filling sand into a container made of cast steel or cast iron before being poured into the mold from the tundish, the container is exposed to the molten steel to increase the inner surface temperature,
There is a problem that the container is deformed or melted.
Furthermore, the temperature of the container rises, and the discharged stuffing sand cannot be solidified by the time the lading sand of the next ladle is discharged, which causes a problem in discharging the stuffing sand of the next ladle.

As a means of this kind, for example, Japanese Patent Laid-Open No. 56-11
In No. 163, a draining molten steel gutter is movably provided within a range where the ladle moves to a predetermined tundish pouring position, and while the ladle is moved to the tundish pouring position, the stuffed sand at the tapping mouth is shed with the molten steel. A method has been proposed in which stuffing sand is not mixed into the tundish by discharging the tundish. According to the method proposed in the above publication, it is possible to prevent the filling sand from being mixed with the molten steel in the tundish.
A drive device for providing and moving a discharge gutter that follows the moving range of the ladle is required, increasing equipment costs,
There was a problem in securing the occupied work space and the treatment of splash (scattered metal) generated on the gutter.

On the other hand, Japanese Patent Laid-Open No. 59-101272 discloses an upper nozzle provided at the bottom of the ladle 1b as shown in FIG.
The upper part of 23b is sealed by the head of the stopper 22a, and the lower part of the upper nozzle 23b is sealed by a sliding nozzle device 26 equipped with a fixed plate 27 and a slide plate 28 so that the upper nozzle hole is not filled with sand. A means for doubly sealing the upper nozzle is disclosed.

The stopper 22a is supported by a horizontal arm 29, and a guide rod 30 is fixed to the other end of the horizontal arm 29. This guide rod 30 is guided by a stopper guide 31 provided on the side wall of the ladle 1b,
The stopper 22a is moved up and down by a lifting cylinder 32 provided between the guide lot 30 and the stopper guide 31.

[0010]

As described above, the stopper elevating / lowering drive device for the ladle and the tundish is attached to the ladle and the tundish main body so as to be concentric with the injection nozzle (upper nozzle) and enhance its controllability. Of course, it also has a fine adjustment function, but there were the following problems. (1) Since the capacity of the tundish itself has increased in recent years, the weight of the tundish has become large and bulky. Therefore, not only the handling and labor of the tundish injection handling are required, but it is also difficult to perform the work of discharging the residual steel and the dregs in the tundish in the casting floor. In many cases, since the stopper and the sliding nozzle device are used together, the above problem becomes more remarkable.

Since it is necessary to install the stopper nozzle control device for each ladle or tundish, the equipment cost is high, and it is necessary to make a connection with an instrumentation-related device outside the system every time, and the work efficiency is reduced due to complexity. In order to solve the above-mentioned problems of the prior art, the present invention separates the stopper body and the drive unit from the tundish or the tundish car and installs them independently on the pouring floor, and at the same time, installs the stopper core in the injection nozzle of the tundish. It is an object of the present invention to provide a stopper control device for an injection nozzle in a continuous casting tundish that can easily match the above.

[0012]

In order to achieve the above object, the present invention provides a stopper position control device for an injection nozzle in a continuous casting tundish, which is independently driven near the continuous casting tundish by a drive device on the casting floor. A rotatable post that is rotatably installed, a horizontal guide frame provided above the rotatable post, and a swing frame that is guided by the horizontal guide frame and is supported by a drive device so as to be able to move forward and backward to a position above the tundish. , A vertical guide frame provided at the tip of the revolving frame, an elevating frame that is guided by the vertical guide frame and is vertically movable by a driving device, and a fine adjustment elevating device attached to the elevating frame. Continuous casting characterized by having a rod-shaped stopper for opening and closing a vertically supported injection nozzle A stopper control device of the injection nozzle in the tundish.

Further, in the present invention, it is preferable to dispose position detecting sensors for detecting the position of the stopper vertically supported on the injection nozzle provided at the bottom of the continuous casting tundish at a plurality of positions on the tundish.

[0014]

The present invention separates the rod-shaped stopper for opening and closing the injection nozzle provided at the bottom of the tundish from the tundish or the tundish car and independently installs it on the pouring floor as described above. By combining the forward-backward movement and elevating mechanism, the stopper can be easily moved from the standby position to the pouring work position and the stopper can be easily aligned with the pouring nozzle of the tundish.

It is preferable that a plurality of position detecting sensors such as an optical sensor for accurately detecting the position of the stopper at the time of aligning the center with the injection port are arranged in advance in the tundish.
With these position detection sensors, it becomes easy to align the position of the stopper with the correct position.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 shows an embodiment of a stopper position control device for an injection nozzle in a continuous casting tundish according to the present invention.
[Fig. 2] is a plan view showing an arrow AA of Fig. 1. As shown in FIG. 1, a rotating post 3 is installed on a casting floor 2 in the vicinity of the tundish 1, and the rotating post 3 is a post rotation including a small gear 4 and a large gear 5 driving motor (not shown) and the like. It is designed to be rotated by the drive device 6 for
A horizontal guide frame 7 is provided above the rotating post 6.

A plurality of guide rollers 8 are provided on the guide portion of the horizontal guide frame 7, and the guide rollers 8 are provided.
A revolving frame 9 is supported so as to be able to move back and forth to a position above the tundish 1 via. This swivel frame 9
The forward / backward drive device 12 comprises a pinion 10 provided on the horizontal guide frame 7, a rack 11 provided on the revolving frame 9, a drive motor (not shown), and the like.

A vertical guide frame 13 is provided at the tip of the revolving frame 9, and an elevating frame 15 having wheels 14 guided by the vertical guide frame 13 is arranged so as to be vertically movable. Lifting device 16 for lifting frame 15
Is a bracket 20 provided on the back of the vertical guide frame 13.
It consists of an upper winch 19, a fixed pulley 17 arranged on a column 18 provided above the vertical guide frame 13, and a wire 20. The winch 19 is wound up by a drive motor (not shown) and lifted by rewinding. The frame 15 is raised and lowered.

The lifting frame 15 includes a fine adjustment lifting device 21.
(It may be an operating transformer type or a hydraulic cylinder type), and a rod-shaped stopper 22 is vertically attached to the lower end of the fine adjustment lifting device 21 so that the injection nozzle 23 of the tundish 1 can be opened and closed. Has become. A sliding nozzle 26 is provided below the injection nozzle 23 to control the amount of molten steel cast into a mold (not shown) via the immersion nozzle 24. Injection nozzle 23
A plurality of optical sensors 25 for accurately detecting the position of are arranged. The optical sensor 25 is, for example, as shown in FIG. 2, two optical sensors 25 spaced apart by a distance corresponding to the diameter of the stopper 22 oriented in the longitudinal direction of the tundish 1, and the tundish 1
Two optical sensors 25 are arranged at a distance corresponding to the diameter of the stopper 22 facing in the width direction. Then, the stopper 22 is placed in a range where the light projected from the two-direction optical sensor 25 is superposed.
It recognizes that when is set in the correct position.

The drive devices such as the post rotation drive device 6, the forward / backward drive device 12, and the elevating / lowering drive device 16 are not limited to those described above, and known drive devices can be appropriately used. Needless to say. The sensor for detecting the position of the stopper is not limited to the optical sensor. Next, the operation of the present invention will be described. For example,
The operation of closing the injection nozzle 23 provided at the bottom of the tundish 1 with the stopper 22 at the standby position will be described. In this case, the stopper 22 is in the raised state. Therefore, first, when the small gear 4 is rotated by the motor (not shown) of the post rotation drive device 6, the large gear 5 rotates and the rotary post 3 rotates. As a result, the revolving frame 9 supported by the horizontal guide frame 7 provided on the upper part of the revolving post 3 revolves, and then stops when revolving to a predetermined position.

Next, the motor of the forward / backward drive unit 12 is started to rotate the pinion 10 to move the rack 11 forward, which causes the turning frame 9 to move forward via the guide roller 8 and the stopper supported by the elevating frame 5. Tundish 22
When it is positioned above the injection nozzle 23 provided at the bottom of 21, the forward movement is stopped. Then, the winch 19 is driven to rewind the wire through the two constant pulleys 17, and the elevating frame 15 is guided by the vertical guide frame 13 to descend. As a result, the stopper 22 supported via the fine adjustment lifting device 21 provided on the lifting frame 15 is lowered, and when it comes close to the injection nozzle 23, the lowering is temporarily stopped. While detecting the position of the stopper 25 by the optical sensors 25 arranged in two directions, the post rotation drive device 6 and the forward / backward drive device 12 are used until the stopper 22 coincides with the position where the projected light overlaps. Adjust the position.

When the stopper 22 is adjusted to a predetermined position and the alignment with the injection nozzle 23 is completed, the fine adjustment lifting device 21
Is used to close the head of the stopper 22 and the hole of the injection nozzle 23 as well as the sliding nozzle 26. After completing this series of operations, remove the tundish from the ladle 1
Injection of molten steel into When the molten steel in the tundish 1 reaches a specified level, the winch 19 is driven to stop it.
The molten steel in the tundish 1 is injected into the mold while raising 22 and controlling the opening of the sliding nozzle 26. The stopper 22 raised above the tundish 1 is retracted from the pouring position to the standby position by an operation substantially reverse to the above-mentioned case.

[0023]

As described above, according to the present invention, not only can all the troubles due to the filling sand be filled in the injection nozzle provided at the bottom of the tundish, but also the stopper and its control device can be used as a tundish or a tundish truck. Since it is separated, the tundish can be made compact and the equipment cost can be reduced.

Further, the workability at the time of pouring molten steel from the tundish is improved, the maintenance work is facilitated, and it is not necessary to perform the conventional connection work between the stopper control device and the instrumentation-related outside the system. .

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross-section of a device according to an embodiment of the present invention.

FIG. 2 is a plan view showing an arrow AA of FIG.

FIG. 3 is a side view showing a section of a device according to a conventional example.

FIG. 4 is a side view showing a section of a device according to another conventional example.

[Explanation of symbols]

 1 Tundish 2 Casting bed 3 Rotating post 4 Small gear 5 Large gear 6 Post rotating drive device 7 Horizontal guide frame 8 Guide roller 9 Swing frame 10 Pinion 11 Rack 12 Forward / backward drive device 13 Vertical guide frame 14 Wheels 15 Lifting frame 16 Lifting / driving device 17 Fixed pulley 18 Column 19 Winch 20 Wire 21 Fine adjustment lifting device 22 Stopper 23 Injection nozzle (upper nozzle) 24 Immersion nozzle 25 Optical sensor 26 Sliding nozzle device 27 Fixed plate 28 Slide plate 29 Horizontal arm 30 Guide rod 31 Stopper guide

Claims (2)

[Claims] 1. A stopper position control device for an injection nozzle in a continuous casting tundish, wherein a rotating post is independently installed near a continuous casting tundish on a pouring floor by a drive device, and an upper part of the rotating post. A horizontal guide frame, a swing frame supported forward and backward by a drive device to a position above the tundish guided by the horizontal guide frame, and a vertical guide frame provided at the tip of the swing frame, An elevating frame which is guided by the vertical guide frame and is arranged to be movable up and down by a driving device, and a rod-shaped stopper which opens and closes an injection nozzle vertically supported through a fine adjustment elevating device attached to the elevating frame. Controller for pouring nozzle in continuous casting tundish, characterized in that . 2. A position detecting sensor for detecting the position of a stopper vertically supported on an injection nozzle provided at the bottom of the continuous casting tundish is arranged at a plurality of positions on the tundish. Position control device for pouring nozzle in continuous casting tundish.