JPH0577017A - Detection of breakout in continuous casting apparatus - Google Patents

Abstract

PURPOSE:To precisely and quickly detect the breakout with a simple device by connecting each one end of plural ropes under stretching condition to a tension detecting instrument and detecting the breakout from the change in the tension in the rope caused by the falling molten metal. CONSTITUTION:When the molten metal 1 projecting from a mold 4 drops due to occurrence of the breakout, the molten metal is stuck to at least one piece of the rope in plural ropes 12, 12... set at the lower part, and this rope 12 is melted and cut. By this cutting, the detecting end part in the tension detecting instrument 13 connected to the one end of the cut rope 12 is displaced, and this displacing signal is transmitted to a control device 8. At the time of receiving this signal in the control device 8, comparison-operation is executed between the detected value and the set value, and after confirmation of the breakout, a control signal is transmitted to a molten metal shut-off device 7, and by working a cylinder, a tip shut-off part in the molten metal shut-off device 7 is dipped into a trough 2 to stop the flow of the molten metal 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting breakout during continuous casting for producing an ingot from a molten metal of aluminum, aluminum alloy and other metallic materials.

[0002]

2. Description of the Related Art In a general continuous casting apparatus, a non-contact type radiation thermometer is often used to detect breakout. This is a very convenient method in which the temperature of the high temperature molten metal that projects at the time of breakout is detected by a non-contact type radiation thermometer.

However, the atmosphere at the portion where the breakout is detected is a unique atmosphere in which heat, gas, cooling water, steam, etc. of the molten metal are mixed, and the dropping position of the molten metal is not uniformly determined, so that it suddenly occurs. It is impossible to detect a breakout that occurs quickly and reliably,
Even if an expensive detection device was installed, the reliability was extremely poor. Therefore, there is a concern that detection of the breakout may be delayed or may not be detected, which may lead to not only damage to the device due to the breakout but also serious accident such as personal injury.

In addition to the above detection method, there is also a method in which, for example, a pan or the like is placed at the position where the molten metal falls and the change in weight is detected. However, with this method, there is a problem that a small amount of molten metal cannot be detected in the early stage of breakout, and detection is delayed, and the molten metal that has fallen is solidified and deposited on the pan,
The removal is complicated.

[0005]

As described above, the conventional breakout detection method is poor in the reliability of the detection accuracy, and its maintenance and safety are also difficult.

The present invention has been made in view of the above circumstances, and even in an atmosphere in which heat of molten metal, gas, cooling water, steam, etc. are mixed, breakout can be detected quickly and reliably, and suddenly. The present invention provides a breakout detection method that prevents damage to the device due to a breakout that occurs at the same time, and at the same time can easily reset even after the breakout is detected.

[0007]

In order to achieve the above object, the present invention is a continuous casting apparatus for introducing molten metal into a mold and casting an ingot while pulling out the ingot from the mold. A breakout detection method in a continuous casting device, characterized in that one end of a yarn is arranged in tension connection with the device and a breakout is detected from a change in tension of the yarn caused by falling molten metal. According to a preferred embodiment, the yarn is made of a heat-meltable material, and the other end of the yarn is wound around a thread winding reel capable of applying tension.

[0008]

[Function] Even in an atmosphere filled with steam or gas, the protruding molten metal falls on the yarn together with the cooling water to give an impact to the yarn, and in some cases, the yarn is melted and cut to form the yarn. Vary the tension of. The tension detecting device to which one end of the yarn is connected detects the fluctuation of the tension, and transmits a detection signal to the control unit as appropriate to confirm the occurrence of breakout.

When the other end of the yarn is wound on, for example, a yarn winding reel provided with a braking means, the yarn is always given a preset tension, and as described above, the yarn breaks due to breakout. At times, resetting is possible by a simple operation in which the yarn is pulled out from the reel and its end is tied to the tension detecting device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A typical embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic perspective view of a continuous casting apparatus showing an implementation situation of the method of the present invention, and FIG. 2 is a side view showing an outline of an example of a breakout detection apparatus suitable for carrying out the method of the present invention.

In FIG. 1, the structure of the continuous casting apparatus is essentially the same as that of the conventionally known apparatus.
That is, in the figure, reference numeral 1 is a molten metal, and the molten metal 1 flowing out of the furnace enters the tundish 3 through the gutter 2 and is introduced into the mold 4 through an orifice plate (not shown). The inside of the mold 4 is configured with a water cooling jacket,
It is cooled by cooling water. The molten metal 1 introduced into the mold 4 is drawn out to the outside by a drawing means (not shown) while being cooled, and the ingot 5 is continuously manufactured. Mold 4
The ingot 5 pulled out from is conveyed to the next step by the conveyor 6.

Reference numeral 7 is a molten metal shutoff device for shutting down the molten metal 1 flowing in the gutter 2 in the middle of the molten metal. The cylinder is actuated in response to a signal from a control device 8, and a shutoff member at the tip is provided via a link mechanism. Is put in and out of the gutter 2.

Immediately below the vicinity of the outlet of the mold 4 is a breakout detecting device 1 which is a feature of the present invention.
0 is set. This breakout detection device 10
As shown in FIGS. 1 and 2, the thread winding reel 11, a plurality of yarns 12, 12, ... Wound in parallel with the thread winding reel 11, and the unwinding reel 11 rewound from the thread winding reel 11. The tension detecting device 13 has a detecting end to which one end of each of the yarns 12, 12, ... Is tied. Yarn 12,1
The interval between 2, ... Is usually 15 to 20 mm, and the total number is about 10.

The yarn winding reel 11 is provided with appropriate braking means (not shown) so that a desired tension is applied to the yarn 12 to be rewound.

The material of the yarn 12 is not particularly limited, but a heat-meltable material such as a heat-meltable resin material is preferable, and a spun yarn is more preferable because it is easy to melt and cut. The number of the yarns 12 is not particularly limited, but if there is only one yarn, there is a risk of losing the chance of coming into contact with the molten metal 1 that falls at the time of breakout, and it is preferable that the number is one that can cover the falling range of the molten metal 1 to some extent.

As the tension detecting device 13, various detecting devices to which a strain gauge is applied, a micro switch and the like can be applied, but it is necessary that the detecting end portion be connected to one end of the yarn. The tension detecting device 13 is connected to the control device 8 and a detection signal of the tension fluctuation of the yarn 12 is sent to the control device 8. The control device 8 determines whether or not a breakout has occurred based on the detection signal, and at the time of the breakout, a signal is sent to the molten metal interrupting device 7 or an alarm device (not shown).

The arrangement of the breakout detecting device 10 ensures that the molten metal 1 protruding due to the breakout will drop onto the yarn 12 so that the yarn 12 is ingot 5.
Are arranged so as to be orthogonal to the longitudinal direction of the.

Now, when continuous casting is performed in a steady state, nothing falls onto the yarn 12, so the yarn 12 maintains a preset tension, and the tension detecting device 13
No special signal is sent from the controller 8 to the continuous casting.

At this point, a breakout occurs and the mold 4
When the molten metal 1 protruding from is dropped, it adheres to at least one of the plurality of yarns 12, 12, ...
The yarn 12 is melt-cut. By this cutting, the tension detecting device 13 in which one end of the cut yarn 12 is tied
2 is displaced from the position indicated by the solid line in FIG. 2 to the position indicated by the broken line, and the displacement signal is sent to the control device 8. When the control device 8 receives the signal, it performs a comparison calculation between the detected value and the set value, confirms that there is a breakout, and then immediately sends a control signal to the molten metal interrupting device 7 to operate the cylinder. Then, the tip blocking portion of the molten metal blocking device 7 is immersed in the gutter 2 to stop the flow of the molten metal 1. At this time, an alarm can be issued at the same time.

These detections and controls are surely and quickly performed without being influenced by the surrounding atmosphere. In the above example, the plurality of yarns are arranged in parallel with each other, but it is also possible to arrange the yarns so that they intersect each other in a free state at the intersection.

[0021]

As is apparent from the above description, according to the present invention, it is possible to employ a detection device having a simple structure and an inexpensive structure, and moreover, it is possible to detect a breakout accurately and quickly in any atmosphere of adverse conditions. In addition, it is easy to reset the cut yarn, and the maintenance thereof is not particularly troublesome.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a continuous casting apparatus showing an implementation status of a method of the present invention.

FIG. 2 is a schematic side view of a tension detecting device that is a feature of the present invention.

[Explanation of symbols]

 1 Molten Metal 2 Gutter 3 Tundish 4 Mold 5 Ingot 6 Conveyor 7 Molten Metal Blocking Device 8 Control Device 10 Breakout Detection Device 11 Spinning Reel 12 Yarn 13 Tension Detection Device

Claims (3)

[Claims] 1. In a continuous casting apparatus for guiding molten metal to a mold and casting an ingot while pulling out of the mold, one end of a yarn is tensioned and connected to a tension detecting device at a protruding position of the molten metal due to breakout, A breakout detecting method in a continuous casting apparatus, characterized in that a breakout is detected from a change in tension of the yarn due to a molten metal that drops. 2. The breakout detection method according to claim 1, wherein the other end of the yarn is wound around a yarn winding reel that can apply tension. 3. The breakout detection method according to claim 1, wherein the yarn is made of a heat-fusible material.