JPH06277812A - Method for selecting wedge brick for fixing weir - Google Patents

Abstract

PURPOSE:To surely select a wedge brick to be used for fixing a weir in advance, at the time of automatically executing a work for fitting the weir in a tundish with a weir fitting device. CONSTITUTION:A measuring instrument 12 symmetrically setting one pair of laser sensors 11 is descended to a prescribed position in the tundish with a supporting column 13 to measure a distance from the measuring instrument 12 to the inner wall of the tundish. A gap between the weir and the inner wall of the tundish is calculated from the difference of the measured result and the weir size inputted in advance in an arithmetic unit 16, and the necessary wedge brick is shown in a monitor 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of selecting a wedge brick used when a weir is attached to a tundish for continuous casting by a weir attaching device.

[0002]

2. Description of the Related Art In recent years, in order to clean molten steel, a weir 1 as shown in FIG. 1 is provided in order to clean molten steel, and a tundish is poured into a tundish 3 through a long nozzle 2 from a ladle. A type is used in which the molten steel is provided with a flow as shown in the figure, and the inclusions in the molten steel are separated and floated by the rising flow of the molten steel.

[0003] In order to attach such a weir to a tundish, a weir is usually lifted from a weir storage case by a crane operation, carried to a predetermined position in the tundish and then lowered, and then a worker who has entered the tundish operates the weir. Wedge-shaped bricks are hammered and fixed in the gap between the tundish and the weir on both sides by a plastic hammer.

As the number of times the tundish inner wall is used increases,
Since the amount of erosion increases, the gap between the inner wall of the tundish and the weir increases as the number of times the tundish is used increases. Some variation in the gap between the tundish inner wall and the weir can be dealt with to some extent by the wedge brick driving amount, but the range from new to the end of the tundish is supported with one kind of wedge brick. I can't let you do it. Therefore, usually, prepare two or more types of wedge bricks of different sizes, and check the degree of the gap between the weir and the inner wall of the tundish when the worker installs the weir in the tundish. I chose wedge brick of the size.

[0005]

In the above-mentioned conventional weir mounting method, it takes several workers and a considerable working time to mount the weir. Especially, the weir replacement work for the tundish regeneration and maintenance must be performed after cooling the inside of the tundish, and even after cooling, the harsh working environment with considerable high temperature, humidity and dust is required. Is being done below.

The present invention is intended to save labor by automating the work of attaching the weir to the tundish by using the weir attaching device, but there are some technical problems to be solved. One of them is the work of selecting wedge bricks to be used. It is an object of the present invention to automatically perform such wedge brick selection work and to install the weir without delay.

[0007]

According to the wedge brick selection method of the present invention, when fixing a weir installed in a tundish for continuous casting by a weir mounting device, a distance measuring means is lowered in the tundish before mounting the weir. The feature is that the distance from the distance means to the tundish inner wall is measured, the gap between the inner wall and the weir is calculated from this, and the wedge brick corresponding to this gap is selected.

As the distance measuring means used in the present invention, a preferable example is a laser sensor which can measure in a non-contact manner. As the laser sensor, for example, the interference of laser light is used, and the number of interference fringes up to the inner wall of the tundish is used. Of the type that reads the, pulsed laser light transmitter,
It consists of a receiver that collects and detects the reflected light from the inner wall of the tundish, and measures the round-trip time until the pulsed laser light is reflected and returned to obtain the distance to the inner wall of the tundish. Laser light is used as the received light, the type that finds the distance to the inner wall of the tundish from the phase comparison with the received light reflected on the inner wall of the tundish, the type based on the principle of the triangulation method, that is, the tundish Irradiate laser light at a certain angle,
An example is a type in which the spot light is captured by a CCD camera and the distance to the inner wall of the tundish is obtained from the image.

In the measurement by the distance measuring means, the distance measuring means may be lowered to a fixed position in the tundish and the distance from the distance measuring means to the wedge brick driving point on the inner wall of the tundish may be measured at only one place. The distance to the inner wall of the tundish may be measured continuously during the descent of the distance measuring means or at regular intervals. If the measurement is continuously performed, the profile of the inner wall of the tundish is required, and even if the melt loss is locally generated, it is possible to select a wedge brick suitable for the profile.

The measurement by the distance measuring means must be performed on the inner wall of the tundish on both sides of the wall. For that purpose, the distance measuring means may be rotated half a turn for measurement, but it is preferable to arrange the distance measuring means side by side back to back and measure simultaneously on both sides.

[0011]

FIG. 2 shows an example of the distance measuring means used in the method of the present invention, which is a laser sensor 11 which is the distance measuring means.
A pair of symmetric measuring devices 12 are suspended in a tundish 14 by a support column 13. The laser sensor 11 consists of a pulse laser light transmitter and a receiver that collects and detects the reflected light from the inner wall of the tundish and measures the round-trip time until the pulse laser light is reflected and returned. Then, the measured value is input to the arithmetic unit 16 via the I / o interface 15, and the difference between the weir attached to the tundish 14 and the inner wall of the tundish is obtained and displayed on the monitor 17. Has become.

The wedge bricks are selected by the measuring device as follows. First, the measuring device 12 is lowered to a predetermined position in the center of the tundish, and the laser sensors 11 on both sides measure the distance from the measuring device 12 to the location where the wedge brick on the inner wall of the tundish is driven. The value measured by the laser sensor is input to the arithmetic unit 16 via the I / o interface 15, and the arithmetic unit 16
Is the distance between the wedge brick driving points on both sides to the inner wall of the tundish calculated from the predetermined position of the measuring device 12 to be lowered and the irradiation angle of the laser beam, and then the size of the weir previously inputted Then, the clearance between the weir and the inner wall of the tundish when the weir is attached to the tundish 14 is calculated. Then, the calculated value and a wedge brick suitable for it are displayed on the monitor 17.

After that, for example, an operator takes out the displayed wedge bricks from a plurality of types of wedge bricks, and sets the wedge bricks at a position where they are held by the wedge clamp 19 provided in the weir mounting device. FIG. 3 is a front view showing an example of the wedge driving device 18 which is a part of the weir mounting device. The wedge driving device 18 includes an air chipper 21 that strikes a wedge brick 20 held by a wedge clamp 19, and a hydraulic cylinder 2 that presses the air chipper 21 against the wedge brick 20.
The hydraulic cylinder 22 is fixed to the support column 23, and the air chipper 21 is vertically movable along the support column 23.

The weir mounting device holds the wedge brick 20 and lifts it together with the weir to be mounted in the tundish, hangs the weir at a predetermined position in the tundish, and creates a gap between the tundish inner wall on both sides of the weir. The operation of driving the wedge bricks 20 into is automatically performed according to the program input to the control unit.

[0015]

According to the wedge brick selecting method of the present invention,
Before mounting each weir on the tundish, the distance between the tundish inner wall is measured by the distance measuring means to accurately calculate the degree of the gap between the weir and the tundish inner wall, and the wedge brick that fits the gap. Since the selection of wedge bricks can be selected automatically, the weir mounting device can perform the subsequent weir mounting work reliably and smoothly.

If the distance measuring means are provided back to back, the measurement can be performed in a short time with one operation.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of a tundish equipped with a weir.

FIG. 2 is a schematic view of a measuring device used in the wedge brick selection method of the present invention.

FIG. 3 is a front view of a wedge driving device which is a part of the weir mounting device.

[Explanation of symbols]

11 ... Laser sensor 12 ...
Measuring device 13 ... Supporting pillar 14 ...
Tundish 15 ・ ・ ・ I / o interface 16 ・ ・ ・
Arithmetic device 17 ... Monitor 18 ...
Wedge driving device 19 ・ ・ ・ Wedge clamp 20 ・ ・ ・
Wedge brick 21 ... Air chipper 22 ...
Hydraulic cylinder 23 ... prop

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keita Furugo Keita 11-1 Showa-cho, Kure-shi, Hiroshima Inside the Kure Steel Works of Nisshin Steel Co., Ltd. (72) Nobuo Matsumoto 11-11 Showa-cho, Kure-shi, Hiroshima Sasaki Industrial Co., Ltd. Kure Branch (72) Inventor Takashi Kawamoto 11-1 Showa-cho, Kure City, Hiroshima Prefecture Sasaki Industrial Co., Ltd. Kure Branch (72) Inventor Kazuhiro Sakuda 11-11, Showa-cho, Kure City, Hiroshima Prefecture Sasaki Industry Co., Ltd. Kure Branch (72) Inventor Ryoichi Negishi 1-1-13 Honmokucho, Naka-ku, Yokohama (72) Inventor Kimio Okamoto 5-6-1 Umei, Takasago

Claims (3)

[Claims] 1. When fixing a weir attached to a tundish for continuous casting by a weir mounting device, the distance measuring means is lowered into the tundish before the weir is attached so that the distance from the distance measuring means to the inner wall of the tundish is reduced. A method for selecting a wedge brick for fixing a weir, characterized by measuring, calculating a gap between the inner wall and the weir, and selecting a wedge brick corresponding to this gap. 2. The method of selecting wedge bricks for fixing a weir according to claim 1, wherein the distance measuring means are arranged back to back. 3. The method for selecting a wedge brick for fixing a weir according to claim 1 or 2, wherein the distance measuring means is a non-contact type.