JPH09300066A - Device for cleaning pouring nozzle in stopper type bottom pouring ladle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability and to efficiently remove slag stuck to the inner surface of a pouring nozzle by composing the device of a rod body directing the inner surface of the pouring nozzle from the outside of the pouring nozzle and a driving means for advancing/retracting the rod body to reduce the oxidation. SOLUTION: A ladle 11 in which no molten metal exists is laid on a receiving table 17 and a piston is driven by supplying pressure oil into a hydraulic cylinder 18 to insert the push-out rod 14 into the inside of the pouring nozzle 12. The slag 15 is hung down and bent over an extent from the bottom part of the ladle 11 to the inlet of the pouring hole 12, but the bending part of the slag 15 becomes the fulcrum of a lever and the slag 15 is easily broken by inserting the push-out rod 14 from the lower part of the pouring nozzle 12 to remove the slag 15. Then, after cleaning the inside of the pouring nozzle 12, the ladle 11 is shifted before a molten metal holding furnace and receives the molten metal and pours a prescribed quantity of the molten metal into the mold again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning device for a discharge nozzle of a stopper-type bottom pouring ladle, more specifically, improving the rigidity of a stopper and reducing oxidation to improve durability.
The present invention also relates to a cleaning device for a discharge nozzle of a stopper-type bottom pouring ladle capable of efficiently removing slag adhering to the inner surface of the discharge nozzle.

[0002]

2. Description of the Related Art In casting of cast iron, cast steel, aluminum alloy, etc., ladle of various shapes is used in the pouring step of pouring molten metal into a mold. What is commonly used is called a tilting ladle, which has a tap hole at the top of the side of the ladle, and when the ladle is tilted, the molten metal inside flows out from the tap hole.

In the tilting ladle, the slag floats on the surface of the molten metal due to the difference in specific gravity, and the molten metal on the surface flows out when the ladle is tilted. Therefore, slag and the like flow into the mold together with the molten metal. Easy to do. The castings mixed with slag have problems such as deterioration of mechanical properties and leak defects.

In order to solve such a drawback of the tilting ladle, a stopper-type bottom pouring ladle capable of supplying a cleaner molten metal at the bottom of the ladle to a mold is widely used. This stopper-type bottom pouring ladle has a discharge nozzle at the bottom and a stopper for sealing the discharge nozzle, and the molten metal is once held in the ladle by pressing the stopper against the discharge nozzle. Then, the discharge nozzle is positioned so as to be right above the gate of the mold, and the stopper is raised so that the molten metal flows from the discharge nozzle toward the gate of the mold. When pouring into the mold is completed, the stopper is lowered again to seal the discharge nozzle. The weight of the molten metal poured into the mold is adjusted by the opening time of the discharge nozzle and its opening.

In a stopper-type bottom pouring ladle, the molten metal at the bottom of the ladle is cleaner than the molten metal on the surface, but it does not mean that there is no slag at all, and it is cloudy or a refractory material on the inner wall of the ladle. There is slag generated by the reaction between the molten metal and the molten metal. Such slag adheres and grows on the inner wall of the discharge nozzle together with repeated pouring, and eventually the discharge nozzle is blocked.

In the past, when the ladle became empty, the pouring worker removed the slag with a tool having a protruding tip, but the work at high temperature puts a heavy burden on the worker, and the slag The discharge nozzle may be damaged when removing.

In order to solve such a problem, Japanese Patent Publication No. 2-45542 discloses a stopper type bottom pouring ladle in which the stopper is hollow and a protruding rod made of steel or ceramic material is passed from above the stopper. ,
There is a disclosure of a device for removing slag adhering to the inner wall of a discharge nozzle.

The structure of the device disclosed in Japanese Patent Publication No. 2-45542 will be described with reference to FIG. Bottom pouring ladle 2
A plunger (protruding rod) 23 that moves up and down is arranged in the hollow portion of the stopper 22 that controls the hot water discharged from 5. The lowermost portion of the plunger 23 is made of ceramic material, steel, or other reinforcing material, and is formed to have a diameter substantially the same as the diameter of the discharge nozzle 12. Then, the plunger 23 is moved up and down by the pressure device 21 to clean and remove the slag 15 accumulated in the discharge nozzle 12. Further, in order to prevent the slag 15 from adhering to the sealing surface between the stopper 22 and the discharge nozzle 12, the stopper 22 is inserted from the cylinder 26.
Also gives a rotational movement to.

[0009]

However, in Japanese Patent Publication No. 2-45542, the stopper 22 has a hollow structure, and it is necessary to make the diameter of the stopper 22 considerably large in order to secure the strength of the stopper 22. is there.
In addition, the material of the stopper 22 is SiO ₂ , Al ₂
Since it is made of a composite material such as O ₃ and C, it is exposed to a high temperature in the atmosphere, so that it is easily oxidized and deteriorated as it is used. Further, when the stopper 22 has a hollow structure, there is a problem that the stopper 22 is oxidized not only from the surface but also from the inside, and the durability is significantly shortened.

As shown in FIG. 3, the slag 15 is also attached to the bottom surface of the bottom pouring ladle 11.
The particles also adhere to the inner surface of the discharge nozzle 12 so as to hang down. Therefore, even if the protruding rod 23 arranged in the groove at the center of the stopper 22 is lowered, the protruding force is received by the bottom of the bottom pouring ladle, so that the slag 15 cannot be effectively removed.

An object of the present invention is to eliminate the lack of rigidity of the stopper in the conventional cleaning device for the discharge nozzle of the stopper-type bottom pouring ladle and to efficiently remove the slag adhering to the inner wall of the discharge nozzle. An object is to provide a cleaning device for a discharge nozzle of a pouring ladle.

[0012]

In order to solve the above-mentioned problems, a cleaning device for a discharge nozzle of a stopper-type bottom pouring ladle according to the present invention is arranged from the outside of the discharge nozzle of the stopper-type bottom pouring ladle to the inside of the discharge nozzle. It is characterized in that it comprises a facing in-and-out rod-shaped body and a drive means for moving the rod-shaped body in and out.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. In FIG. 1, the cleaning device for the discharge nozzle of the stopper-type bottom pouring ladle is arranged outside the discharge nozzle 12 of the stopper-type bottom pouring ladle 11 coaxially with the center of the discharge nozzle 12 and protruding toward the discharge nozzle 12. It is composed of a rod 14 and a hydraulic cylinder 18 attached to a pedestal 16 that is connected to the protruding rod 14 to move in and out. The pedestal 16 also has a pedestal 17 on which the ladle 11 is placed. Then, when the ladle 11 is placed on the pedestal 17, the center of the ejection nozzle 12 and the center of the ejection rod 14 are aligned with each other.

When cleaning the discharge nozzle 12, the ladle 1 has been filled and the molten metal held therein has been emptied.
1 is moved and placed on the pedestal 17. Not only the pedestal 17 having a guide but also a contact or non-contact type sensor can be used for positioning when mounting. Next, hydraulic pressure is supplied into the hydraulic cylinder 18 to drive a piston (not shown) to insert the ejection rod 14 into the inner surface of the discharge nozzle 12. The slag 15 is discharged from the bottom of the ladle 11 to the discharge nozzle 12
Although it hangs down toward the inlet of the slag, when the protruding rod 14 is inserted from the lower part of the discharge nozzle 12, the slag 1
The bent portion of 5 serves as a fulcrum of the lever and is easily broken, and the slag 15 can be efficiently removed. After cleaning the inner surface of the discharge nozzle 12, the ladle 11 is moved to the front of the molten metal holding furnace to receive the molten metal, and a predetermined amount of molten metal is again poured into the mold.

Next, the results of stopper size, durability and cost ratio of an embodiment of a cleaning device for a discharge nozzle of a stopper type bottom pouring ladle and a comparative example disclosed in Japanese Patent Publication No. 2-45542 are summarized. It shows in Table 1.

[0016]

[Table 1] Stopper dimension durability Cost ratio Outer diameter (mm) Inner diameter (mm) (days) (per month) Example 50 None (solid) 4 days 0.36 Comparative example 70 40 (through hole) 3 days 1

As shown in Table 1, in the embodiment, since the stopper 13 has no through hole and is solid, the rigidity is secured,
A diameter of 50 mm is sufficient for the stopper 13. As a result, the material cost and processing cost of the stopper 13 can be reduced. In addition, since the examples are solid, there is no oxidation from the inner surface as in the hollow structure of the comparative example, and the durability is improved.

[0018]

As described above in detail, the cleaning device for the discharge nozzle of the stopper-type bottom pouring ladle according to the present invention comprises a rod-shaped body facing from the outside of the discharge nozzle of the stopper-type bottom pouring ladle to the inner surface of the discharge nozzle. Since the rod-shaped member is driven in and out, the rigidity of the stopper is improved, the durability is improved without oxidation from the inner surface, and the slag adhering to the inner surface of the discharge nozzle can be efficiently removed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cleaning device for a discharge nozzle of a stopper-type bottom pouring ladle showing an example of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a discharge nozzle cleaning device disclosed in Japanese Patent Publication No. 2-45542.

FIG. 3 is a detailed cross-sectional view of a discharge nozzle cleaning device disclosed in Japanese Patent Publication No. 2-45542.

[Explanation of symbols]

11 bottom pouring ladle, 12 discharge nozzle, 13
Stopper, 14 protruding rod, 15 slug, 16 mount, 17 mounting base, 1
8 hydraulic cylinders, 21 pressure device, 22 stoppers, 23 ejector rods, 26 cylinders.

Claims (1)

[Claims] 1. A discharge nozzle for a stopper-type bottom pouring ladle, comprising a rod-shaped body facing the inside of the discharge nozzle from the outside of the discharge nozzle of the stopper-type bottom pouring ladle, and a drive means for moving the rod-shaped body in and out. Cleaning device.