JPH06287651A - Device for treating molten metal - Google Patents

Abstract

PURPOSE:To simply change a baffle plate and to prevent the erosion of a fitting part by inserting the baffle plate for preventing eddy and waving from a through-hole arranged in a cover and fitting the baffle plate to a baffle plate fitting part at the outer part of the cover so as to be freely fittable/removable. CONSTITUTION:The baffle plate 3 for preventing the eddy and the waving, inserted from the through-hole 7 arranged in the cover 2 is hung down into molten metal incorporated in a treating vessel 1 and dipped to the lower part thereof. The baffle plates 3 are arranged in plural pieces on the same circle at a prescribed interval. This molten metal is stirred by rotating a rotary body 6 arranged therein, and also treating gas is supplied from a treating gas passage 5 arranged in a vertical rotary shaft 4 and injected from an injecting hole arranged in the rotary body 6 and brought into contact with the molten metal as fine bubbles. In this treating device for removing dissolved gas and non-metallic inclusion in the molten metal, the baffle plate fitting part 8 stood up on the upper surface of the cover 2 is arranged and to this fitting part, the baffle plate 3 is fitted so as to be freely fittable/removable with a bolt 9 and a nut 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a molten metal processing apparatus,
More specifically, the lid of the processing tank is provided with a baffle plate for preventing swirl and corrugation in a hanging shape, and the lower part of the baffle plate for preventing swirl and corrugation is immersed in the molten metal contained in the processing chamber. The process gas is introduced into the molten metal in the form of fine bubbles, and the molten metal is agitated by the rotating body immersed in the molten metal to bring the process gas and the molten metal into contact with each other. The present invention relates to a device for removing the dissolved gas and non-metallic inclusions of.

[0002]

2. Description of the Related Art As an apparatus for processing molten metal of this type, a baffle plate mounting portion is provided on the lower surface of a lid of a processing tank, and an upper end portion of a baffle plate for preventing eddy currents and corrugations can be attached to and detached from the mounting portion by bolts and nuts. Is known (see Japanese Utility Model Publication No. 1-7716).

[0003]

However, the conventional apparatus has a problem that the molten metal is scattered during the processing operation and the bolts and nuts are eroded, so that the baffle plate cannot be easily removed when the baffle plate is replaced. Moreover, the baffle is exhausted,
Even if it is not damaged, if the bolts and nuts are eroded, the baffle plate may fall off, so it is necessary to replace them, and there is a problem that the work is troublesome. Furthermore, when replacing the baffle plate, bolts, nuts, etc., it is necessary to lift the entire lid with a crane or the like, which is a troublesome work.

An object of the present invention is to provide a molten metal processing apparatus which solves the above problems.

[0005]

In a molten metal treating apparatus according to the present invention, a baffle plate for preventing vortex and corrugation is provided in a hanging manner on a lid of a treatment tank, and a lower portion of the baffle plate for preventing vortex and corrugation is provided. Is immersed in the molten metal placed in the treatment tank, and the molten metal is agitated by the rotary body immersed in the molten metal while introducing the treatment gas into the molten metal in the form of fine bubbles. A device for removing dissolved gas and non-metallic inclusions in the molten metal by bringing the processing gas and the molten metal into contact with each other, wherein a through hole is formed in the lid and a baffle plate mounting portion is provided on the upper surface of the lid. The
The baffle plate for preventing eddy currents and corrugations is passed through the through hole and is detachably attached to the baffle plate attachment portion outside the lid.

[0006]

With the through hole formed in the lid and the baffle plate mounting portion provided on the upper surface of the lid, the baffle plate for preventing eddy currents and corrugation is passed through the through hole and attached to and detached from the baffle plate mounting portion outside the lid. If it is attached freely, molten metal does not scatter to members such as bolts and nuts that attach the baffle plate to the baffle plate mounting portion even during processing work.
Erosion of these components is prevented. Also, when replacing the baffle plate, the work can be performed outside the lid, so there is no need to remove the lid.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

The molten metal processing apparatus has a removable lid (2)
With a treatment tank (1) for containing molten metal and a lid (2)
Is installed in the treatment tank (1) and a plurality of baffles (3) for preventing eddy currents and corrugations that are immersed in the molten metal in the treatment layer (1). At the same time, it penetrates the lid (2) and the upper part extends outside the treatment tank (1),
In addition, the vertical rotation axis (4) with the processing gas supply path (5) inside
And a rotating body (6) for processing gas atomization dispersion fixedly provided at the lower end of the vertical rotation shaft (4). The baffle plate (3) for preventing eddy currents and corrugations is preferably made of ceramics such as SiC or SiN or graphite, but it is not limited to this, and it does not react with the molten metal and is eroded by the molten metal. It may be made of a difficult material.

On the circumference of the lid (2) which is concentric with the vertical rotation shaft (4), a plurality of baffle plate insertion through holes (7) are formed at intervals in the circumferential direction. In addition, a baffle plate mounting portion (8) is integrally formed in the upper surface of the lid (2) so as to project upward at a portion close to each through hole (7). The baffle plate (3) for preventing eddy currents and corrugations is passed through the through hole (7), and the upper end of the baffle plate (3) is detachably attached to the baffle plate attachment part (8) with the bolt (9) and the nut (11). There is. The baffle plate (3) for preventing eddy currents and ripples is preferably arranged in a direction orthogonal to the flow direction of the molten metal stirred by the rotating body (6).

The vertical rotation shaft (4) is adapted to be rotated by a rotation driving device (not shown) arranged above the treatment layer (1). The upper end of the processing gas supply path (5) is connected to a processing gas supply device (not shown), and the lower end is the rotating body (6).
It opens into a gas chamber (not shown) formed in the center of the inside. Although not shown, a plurality of stirring projections are formed on the circumferential surface of the rotating body (6) at intervals in the circumferential direction. In addition, a plurality of through holes are formed radially in the rotating body (6), one end of which opens into the gas chamber and the other end of which opens into the tip surface of the stirring projection. Further, a plurality of grooves extending from the central portion to the peripheral surface are radially provided on the bottom surface of the rotating body (6).

In such a structure, the vertical rotation shaft (4)
Is driven to rotate at high speed by the driving device, and the processing gas is supplied from the processing gas supply device to the processing gas supply path (5). The processing gas is released from the lower end of the processing gas supply path (5) into the gas chamber, flows through the radial through holes to the periphery, and is released into the molten metal in the form of fine bubbles from the tip surface of the stirring projection. To be done. The atomized bubbles are the rotating body (6)
Process layer (1) according to the flow of molten metal generated by the rotation of the
Distributed throughout. At this time, the baffle plate (3) prevents significant eddy currents and ripples on the surface of the molten metal. In addition, a small turbulent flow occurs on the back side of the baffle plate (3) (the surface opposite to the surface where the molten metal flows), and this turbulent flow makes the processing gas finer and more efficient. ) Distributed throughout. Then, the bubbles of the processing gas dispersed throughout the processing tank (1) come into contact with the molten metal, and the dissolved gas and non-metallic inclusions are removed.

If it is necessary to replace the baffle plate (3) for preventing eddy currents and ripples due to wear or damage, the cover
The bolt (9) and the nut (11) may be removed outside (2).

[0013]

According to the apparatus for treating molten metal of the present invention, as described above, the molten metal is scattered on the members such as bolts and nuts for attaching the baffle plate to the baffle plate mounting portion even during the processing operation. However, erosion of these components is prevented. Therefore, it can be easily removed when the baffle plate is replaced. Moreover, it is not necessary to replace the baffle plate due to erosion of members such as bolts and nuts. Moreover, since it is not necessary to remove the lid when replacing the baffle plate, the work is simplified.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

[Explanation of symbols]

 1 Processing Tank 2 Lid 3 Baffle Plate for Preventing Eddy Current and Rippling 6 Rotating Body 7 Through Hole for Baffle Plate Insertion 8 Baffle Plate Mounting Portion

Claims (1)

[Claims] 1. A lid of a processing tank is provided with a baffle plate for preventing vortex and corrugation in a hanging shape, and a lower portion of the baffle plate for preventing vortex and corrugation is dipped in a molten metal placed in the processing tank. The process gas is introduced into the molten metal in the form of fine bubbles, and the molten metal is agitated by the rotating body immersed in the molten metal to bring the process gas and the molten metal into contact with each other. Is a device for removing the dissolved gas and non-metallic inclusions, wherein a through hole is formed in the lid, and a baffle plate mounting portion is provided on the upper surface of the lid.
An apparatus for treating molten metal, wherein a baffle plate for preventing eddy currents and corrugations is passed through a through hole and is detachably attached to a baffle plate attachment portion outside the lid.