JP2010084213A - Method and apparatus for cleaning molten metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for cleaning molten metal with which in a pumping-out chamber for holding the molten metal, the cleaning degree of the molten metal is raised and also, the solidification of the molten metal and slag in the inner part of the pumping-out chamber is prevented. <P>SOLUTION: The molten metal cleaning apparatus 1 is provided with a rotating rotor 10 for stirring the molten metal Y and also exhausting inert gas; a first driving part for rotating the rotating rotor 10; a holder tool 11 for movably holding the rotating rotor 10; and a moving means 12 for moving the rotating rotor 10 along the holding tool 11 at the upper part of the pumping-out chamber 4. The holding tool 11 is formed along the circumferential part of the bottom surface 8a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention separates and removes non-metallic inclusions and hydrogen gas from a molten metal, and also provides a molten metal cleaning method and molten metal cleaning that prevents solidification and deposition of molten metal and soot in a pumping chamber that holds the molten metal. The present invention relates to a conversion device.

  A molten metal produced by melting an aluminum ingot or the like has a problem that it inevitably contains non-metallic inclusions, hydrogen gas, and the like. If such non-metallic inclusions and hydrogen gas are contained in the molten metal, it is not preferable because it causes defects in the molded product. Accordingly, there is known a molten metal cleaning device, a so-called degassing device, for promoting the separation and removal of non-metallic inclusions from the molten metal and reducing the amount of hydrogen gas.

  For example, the molten metal cleaning apparatus according to Patent Document 1 mainly includes a rotating rotor that rotates in the molten metal and a drive unit that drives the rotating rotor. A disk-shaped rotor is provided at the lower part of the rotating rotor, and the inert gas is blown out from a through hole formed in the bottom surface of the rotor. With such a configuration, the aerated inert gas is dispersed in the molten metal and the molten metal is agitated, so that the dissolved hydrogen is diffused into the bubbles of the inert gas, and the nonmetallic inclusions are converted into the inert gas. It can be attached to the interface of the molten metal and the cocoon can float on the surface of the molten metal. Thereby, nonmetallic inclusions and hydrogen gas can be separated and removed from the molten metal.

JP-A-7-233425

  When the molten metal cleaning device is arranged at the center of the pumping chamber as in the conventional molten metal cleaning device, the molten metal and soot are solidified and deposited inside the pumping chamber, particularly at the peripheral edge of the bottom surface of the pumping chamber. As described above, when molten metal and soot are accumulated in the pumping chamber, there is a problem that the cleanliness of the molten metal is lowered and maintenance of the pumping chamber becomes complicated.

  SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a molten metal cleaning method and a molten metal cleaning apparatus capable of increasing the cleanliness of molten metal and preventing solidification and accumulation of molten metal and soot in the pumping chamber. To do.

  In order to solve such a problem, the present invention provides a molten metal cleaning method for performing at least one of degassing and degassing in a pumping chamber for holding a molten metal. The rotor of the rotary rotor that discharges the active gas is moved along the peripheral edge of the bottom surface of the pumping chamber.

  According to this method, the molten metal at the peripheral edge of the bottom surface of the pumping chamber can be fluidly stirred to suppress a temperature drop, and the solidification and accumulation of molten metal and soot at the peripheral edge of the bottom surface can be prevented. As a result, the service life of the pumping chamber can be extended, and the labor for maintenance such as removal of deposits can be reduced. Moreover, since the molten metal can be efficiently stirred by moving the rotary rotor in the pumping chamber, the fluidity of the molten metal can be improved. Thereby, since the dispersibility of an inert gas can be improved, the degassing and degassing efficiency of a molten metal can be improved.

  Further, it is preferable that the rotor of the rotating rotor is continuously moved away from the bottom surface of the pumping chamber by a certain distance.

  According to such a method, for example, even when the bottom surface of the pumping chamber is inclined, the molten metal in the vicinity of the bottom surface can be uniformly stirred, and the molten metal and soot at the peripheral edge of the bottom surface of the pumping chamber can be obtained. It is possible to prevent the solidification and deposition of the material.

  Further, it is preferable that the moving speed of the rotating rotor is slowed down or stopped to intensively agitate the inner corner of the pumping chamber.

  Here, the inner corner portion refers to an inner region formed by the bottom surface of the pumping chamber and the two wall surfaces constituting the pumping chamber. Since the temperature of the molten metal is locally reduced in the inner corner, the molten metal and soot are easily solidified and deposited. However, according to such a method, the molten metal in the inner corner is fluidly stirred to suppress a temperature drop, and the molten metal and soot can be further prevented from solidifying and accumulating.

  The present invention also relates to a molten metal cleaning method for performing at least one of degassing and degassing in a pumping chamber for holding a molten metal, the rotating rotor for stirring the molten metal and releasing an inert gas. The rotor is operated at an inner corner of the pumping chamber.

  According to this method, the molten metal in the inner corner is fluidly stirred to suppress a local temperature drop, and the molten metal and the solidified and deposited metal can be prevented. Moreover, since the dispersibility of an inert gas can be improved by improving the fluidity | liquidity of the molten metal in a pumping chamber, the degassing and degassing efficiency of a molten metal can be improved.

  The present invention also provides a rotating rotor that stirs the molten metal and discharges an inert gas, a first drive unit that rotates the rotating rotor, and a pumping chamber that holds the molten metal above the pumping chamber. A holding jig that is movably held; and a moving means that moves the rotary rotor along the holding jig, wherein the holding jig is formed along a peripheral edge of the bottom surface of the pumping chamber. It is characterized by being.

  According to such a configuration, since the rotary rotor moves on the holding jig formed along the peripheral edge portion of the bottom surface of the pumping chamber, the fluidity of the molten metal at the peripheral edge portion of the bottom surface of the pumping chamber can be improved. it can. Thereby, the local temperature fall in the peripheral part of the bottom face of a pumping chamber can be suppressed, and solidification and accumulation of molten metal and soot can be prevented. Therefore, the service life of the pumping chamber can be extended, and the labor for maintenance such as removal of deposits can be reduced. Moreover, since the molten metal can be efficiently stirred by moving the rotary rotor in the pumping chamber, the unevenness of the temperature of the molten metal can be eliminated and the fluidity of the molten metal can be improved. Thereby, since the dispersibility of an inert gas can be improved, the degassing and degassing efficiency of a molten metal can be improved.

  Further, the moving means transmits a wheel roller that rotates and moves along the holding jig, a second drive unit that drives the wheel roller, and transmits the drive of the second drive unit to the wheel roller. It is preferable to have a shaft portion.

  The wheel rollers are preferably formed on both sides of the rotating rotor. According to such a configuration, the rotating rotor can move stably without tilting.

  Moreover, it is preferable that the said holding jig is suspended from the suspension surface via the connection tool, or is fixed to the said pumping chamber via the connection member. Thereby, the holding jig can be stably disposed.

  The rotating rotor preferably includes a rotor at the tip of a shaft, and the maximum cross-sectional area of the rotor is preferably 1/8 or less of the area of the bottom surface of the pumping chamber. Thereby, the degassing and degassing efficiency of the molten metal can be further increased.

  According to the molten metal cleaning method and the molten metal cleaning apparatus according to the present invention, the life of the pumping chamber can be extended, and maintenance work such as removal of deposits can be reduced. Moreover, since the dispersibility of an inert gas can be improved, the degassing and degassing efficiency of a molten metal can be improved.

[First embodiment]
The best embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a molten metal cleaning apparatus according to the first embodiment. FIG. 2 is a side view showing the molten metal cleaning apparatus according to the first embodiment. 3 is a cross-sectional view taken along the line II of FIG. FIG. 4 is an enlarged front sectional view of the molten metal cleaning apparatus according to the first embodiment. FIG. 5 is a schematic plan view showing a moving state of the rotary rotor according to the first embodiment.
As shown in FIGS. 1 to 3, in the first embodiment, a case where the molten metal cleaning device 1 is installed in the pumping chamber 4 of the continuous processing furnace 2 will be described as an example.

  As shown in FIGS. 1 and 2, the continuous processing furnace 2 includes a melting furnace 3 for melting, for example, an aluminum ingot E, and a pumping chamber 4 for holding a molten metal Y melted in the melting furnace 3. The melting furnace 3 includes a burner (not shown), and is heated at about 720 ° C. to 900 ° C. to melt the aluminum ingot E to generate the molten metal Y.

  The pumping chamber 4 is arranged in parallel with the melting furnace 3 across the furnace wall 5 of the melting furnace 3, and holds the molten metal Y flowing from the melting furnace 3. A melt cleaning device 1 is disposed in the pumping chamber 4. The pumping chamber 4 includes a bottom portion 8 having a bottom surface 8 a that has a rectangular shape in plan view, and wall portions 7 a, 7 b, 7 c, and 7 d erected from the bottom portion 8. As shown in FIG. 2, the bottom surface 8a has a horizontal surface 9a formed horizontally on the wall 7a side, and an inclined surface 9b formed inclined from the horizontal surface 9a to the wall 7c facing the wall 7a. .

  As shown in FIGS. 1 and 2, a hot water outlet 6 is formed so as to penetrate the furnace wall 5 of the melting furnace 3 and the lower part of the wall portion 7 a of the pumping chamber 4. It is formed so that the molten metal Y flows into the chamber 4 side. In the drawing chamber 4, it is common to hold | maintain at about 680 to 790 degreeC so that the molten metal Y may not harden. It is preferable to stabilize the holding temperature of the molten metal Y by installing heating means such as a heater in the pumping chamber 4. In the present embodiment, a part of the bottom surface 8a of the pumping chamber 4 is inclined, but the entire bottom surface 8a may be formed horizontally.

  As shown in FIGS. 1 to 3, the molten metal cleaning device 1 is disposed in the pumping chamber 4, and performs degassing processing and degassing processing on the molten metal Y melted in the melting furnace 3. This is performed to separate and remove non-metallic inclusions contained in the molten metal Y and reduce the amount of hydrogen gas.

  The molten metal cleaning device 1 stirs the molten metal Y and supplies an inert gas into the molten metal Y, a first drive unit M1 (see FIG. 3) for driving the rotating rotor 10, and a pumping out. A holding jig 11 that holds the rotary rotor 10 movably above the chamber 4, a moving means 12 that moves the rotary rotor 10 along the holding jig 11, and an exhaust hood H and the holding jig 11 are connected. And a gas supply unit 24 for supplying an inert gas to the rotary rotor 10.

  As shown in FIG. 3, the rotary rotor 10 includes a shaft 22 that extends downward from the first drive unit M <b> 1 and a rotor 23 that is integrally formed at the tip of the shaft 22. The rotary rotor 10 supplies an inert gas into the molten metal Y through the shaft 22 and the rotor 23, and diffuses hydrogen dissolved in the molten metal into the bubbles of the inert gas, while preventing non-metallic inclusions. It can be attached to the interface between the active gas and the molten metal Y and floated and separated as soot.

  The shaft 22 is a columnar member made of, for example, carbon, and rotates in the circumferential direction by driving a first driving unit M1 described later. A hollow portion is formed inside the shaft 22 so that an inert gas flows into the rotor 23 side. The number of rotations of the shaft 22 is not particularly limited, but is set to 300 rpm in the present embodiment.

  In this embodiment, the rotor 23 is integrally formed at the tip of the shaft 22, and a plurality of swirl teeth 23 a formed by notching at predetermined intervals at the lower end of the rotor 23. . At the center of the bottom surface (lower part) of the rotor 23, a discharge port (not shown) for discharging an inert gas is formed. Since the rotor 23 has the swivel teeth 23a at the lower end, the inert gas discharged from the discharge port can be subdivided and the molten metal Y can be suitably stirred. Thereby, the degassing and degassing treatment efficiency of the molten metal Y can be increased. In this embodiment, the rotor 23 is formed to move from the bottom surface 8a of the pumping chamber 4 at a height position of about 10 cm to 20 cm.

  In addition, the rotor 23 should just be what can stir the molten metal Y, and a shape is not restrict | limited. Further, the stirring efficiency may be increased by providing a spiral blade on the rotor 23. Further, it is preferable that the maximum cross-sectional area of the rotor 23 is 1/8 or less of the area of the bottom surface 8a of the pumping chamber 4 because stirring can be performed efficiently. Moreover, although the discharge port which discharge | releases an inert gas was provided in the bottom face of the rotor 23 in this embodiment, you may provide in the side surface of the rotor 23. FIG.

  As shown in FIG. 4, the first drive unit M1 is a power source that rotates the shaft 22, and is connected to a power source via a cord (not shown). The 1st drive part M1 is accommodated in the accommodating part 21 which is a housing | casing. The housing unit 21 includes a first drive unit (motor) M1 that rotates the shaft 22, and a control unit (not shown) such as an inverter that controls the rotation direction and the rotation speed of the first drive unit M1. The accommodating part 21 is connected with the shaft 22 via the joint 25 and the bearing 26 in this embodiment. The upper part of the accommodating part 21 is inserted into the opening of the holding jig 11.

  The gas supply unit 24 is a gas supply pipe that supplies an inert gas such as argon or nitrogen. The gas supply unit 24 is connected to the storage unit 21 and is formed so that an inert gas is supplied to the shaft 22 and the rotor 23 in a predetermined amount. In this embodiment, the gas supply unit 24 is set to be supplied at 1 to 10 L / min. As the inert gas, it is desirable to use Ar gas whose dew point is controlled at, for example, −60 ° C. or less.

  In the present embodiment, only the inert gas is formed so as to be discharged from the rotary rotor 10, but the present invention is not limited to this. For example, a flux supply device is provided in parallel to allow the inert gas and the flux to be discharged. You may comprise so that it may diffuse in the molten metal Y.

  As shown in FIGS. 1 and 4, the holding jig 11 is disposed above the pumping chamber 4. The holding jig 11 is formed in an annular shape along the inner wall surfaces of the wall portions 7a to 7d. The holding jig 11 plays a role of holding the rotating rotor 10 via the accommodating portion 21 and guiding the movement of the rotating rotor 10. In this embodiment, the holding jig 11 is formed so that both ends of an extruded profile made of an aluminum alloy are joined by welding or friction stir welding to form a rectangular ring shape in plan view. The four corners of the holding jig 11 are bent with a predetermined curvature so that the rotary rotor 10 moves smoothly.

  As shown in FIG. 2, the holding jig 11 has a pair of horizontal portions 11a and 11c having different height positions, and includes an inclined portion 11b formed between the horizontal portion 11a and the horizontal portion 11c. Yes. The inclined portion 11b of the holding jig 11 and the inclined surface 9b of the bottom surface 8a are formed with the same gradient (that is, parallel). Further, the horizontal portion 11a of the holding jig 11 and the horizontal surface 9a of the bottom surface 8a are formed in parallel. The holding jig 11 is suspended through connecting tools 13, 13... Suspended from an exhaust hood H disposed above the continuous processing furnace 2.

  The shape of the holding jig 11 will be described in more detail. As shown in FIG. 4, the holding jig 11 includes an upper plate 31 suspended from the connector 13, a pair of side plates 32a and 32b extending vertically downward from both ends of the upper plate 31, and a side plate 32a. , 32b and lower plates 33a, 33b respectively extending from the lower end toward the accommodating portion 21 side, and lips 34a, 34b extending upward from the tips of the lower plates 33a, 33b. The heights of the side plates 32a and 32b and the widths of the lower plates 33a and 33b are formed so as to accommodate wheel rollers 41a and 41b described later. That is, the wheel rollers 41a and 41b are formed to move on the lower plates 33a and 33b. Further, by providing the lips 34a and 34b standing from the tips of the lower plates 33a and 33b, it is possible to prevent the wheel rollers 41a and 41b from dropping from the lower plates 33a and 33b.

  The moving means 12 is a means for moving the rotary rotor 10 along the holding jig 11. In this embodiment, the moving means 12 includes a second drive unit (motor) M2 housed in the housing unit 21, and wheel rollers 41a and 41b respectively disposed on the lower plates 33a and 33b of the holding jig 11. The shaft portion 42 transmits the drive of the second drive portion 43 to the wheel rollers 41a and 41b.

  The second drive unit M2 includes a control unit (not shown) such as an inverter that controls the rotation direction and the rotation speed of the second drive unit M2, and rotates the shaft unit 42. The wheel rollers 41a and 41b have a cylindrical shape, rotate with the shaft portion 42, and roll on the lower plates 33a and 33b. The material of the wheel rollers 41a and 41b is not particularly limited, but preferably has high heat resistance.

  As shown in FIG. 2, the connector 13 is a member that connects the suspension surface of the exhaust hood H formed above the pumping chamber 4 and the holding jig 11. In this embodiment, the connector 13 suspends the four corners of the holding jig 11. The material of the connector 13 is not particularly limited, but is preferably one having high heat resistance.

Next, the operation and effect of the molten metal cleaning apparatus 1 according to the present embodiment will be described.
According to the molten metal cleaning apparatus 1 according to the present embodiment, since the holding jig 11 is annularly arranged along the walls 7 a to 7 d of the pumping chamber 4, the rotary rotor 10 is attached to the bottom surface 8 a of the pumping chamber 4. It can be moved along the periphery. Thereby, since the fluidity | liquidity of the molten metal Y in the peripheral part of the bottom face 8a of the pumping chamber 4 can be improved, the temperature fall of the molten metal Y is suppressed and the molten metal Y and the soot solidify and deposit on the bottom face 8a. Can be prevented.

  Here, FIG. 5 is a schematic plan view showing a moving state of the rotary rotor according to the first embodiment. As shown in FIG. 5, there is a problem that the molten metal Y and the soot are particularly easily deposited in the inner corner U of the pumping chamber 4. However, according to the present embodiment, since the rotary rotor 10 moves in the vicinity of the inner corner portion U, the fluidity of the inner corner portion U can be improved, and the above problem can be solved. Therefore, the service life of the pumping chamber 4 can be extended, and the labor for maintenance such as removal of deposits in the pumping chamber 4 can be reduced.

  Further, since the inert gas is discharged and dispersed in the molten metal Y from the rotor 23 of the rotary rotor 10 disposed in the molten metal Y, hydrogen dissolved in the molten metal Y is bubbled into the inert gas. While diffusing inside, non-metallic inclusions can be attached to the interface between the inert gas and the molten metal Y to float and separate as soot.

  Here, the soot that floats on the molten metal surface means an oxide film, a non-metallic inclusion, or the like that is inherent in the molten metal Y. That is, the oxide film, non-metallic inclusions, etc., which were inherent in the molten metal Y, are also attached to the interface between the fine bubbles of the inert gas and the molten metal, and floated and separated together with the bubbles. Furthermore, the dissolved gas such as hydrogen in the molten metal Y diffuses into the inert gas in the bubbles having a lower chemical potential than in the molten metal, and is taken into the bubbles, floats on the surface of the molten metal, and blows as bubbles. Released into.

  Further, since the rotary rotor 10 is moved in the pumping chamber 4, the inert gas released from the rotary rotor 10 is more efficient than the conventional case where the rotary rotor 10 is fixed at the center of the pumping chamber 4. It can be well dispersed in the molten metal Y. Thereby, degassing and degassing treatment efficiency can be increased.

  In the present embodiment, as shown in FIG. 2, the holding jig 11 is formed so as to be substantially parallel to the gradient of the bottom surface 8 a of the pumping chamber 4. Thereby, it can move continuously, keeping the separation distance of the bottom face 8a of the pumping chamber 4 and the rotor 23 constant. That is, by moving the rotor 23 in accordance with the gradient (inclination) of the bottom surface 8a of the pumping chamber 4, the molten metal Y near the bottom surface 8a can be uniformly stirred. Thereby, even if it is a case where the gradient is formed in the bottom face 8a of the pumping chamber 4, solidification and deposition of the molten metal Y and the soot in the peripheral part of the bottom face 8a can be prevented.

  Moreover, according to the moving means 12 of this embodiment, since the wheel rollers 41a and 41b are provided on both sides of the rotating rotor 10, the rotating rotor 10 can be stably moved without being inclined.

  The best embodiment of the present invention has been described above, but various modifications can be made without departing from the spirit of the present invention. For example, the movement of the rotary rotor 10 is stopped or decelerated at the inner corner U of the pumping chamber 4 by a control unit (not shown) provided in the second drive unit M2 of the moving unit 12 to reduce the inner corner. You may set so that the molten metal Y of the part U may be stirred intensively.

  FIG. 6 is a side view showing a modification of the present invention. In the present embodiment, the holding jig 11 is suspended from the exhaust hood H via the connector 13, but the present invention is not limited to this. For example, as shown in FIG. 6, a pair of connecting members 41 and 42 may be provided on the walls 7a and 7c, and the holding jig 11 may be interposed therebetween. The connecting members 41 and 42 are not particularly limited in material and shape, and may be any members that can fix the holding jig 11 to the pumping chamber 4.

  Further, the shape of the holding jig 11 is preferably formed so as to be substantially similar to the planar shape of the bottom surface 8a of the pumping chamber 4 as in the present embodiment, but is not limited thereto. For example, the holding jig 11 may be formed in a meandering shape so that it can move over the bottom surface 8a.

  Moreover, in this embodiment, although the movement of the rotation rotor 10 was guided using the holding jig 11, it is not necessary to move the rotation rotor 10 necessarily. For example, the four rotary rotors 10 may be fixed to the upper ends of the wall portions 7a to 7d applied to the four inner corners U of the pumping chamber 4 via known connecting members. Also by such a method, since the inner corner U of the pumping chamber 4 can be suitably stirred, a local temperature drop in the inner corner U is suppressed, and solidification and accumulation of molten metal and soot are prevented. be able to.

  In the present embodiment, the molten metal cleaning device 1 is suspended from the exhaust hood H. However, when there is no exhaust hood H, the melt cleaning device 1 may be suspended from the suspension surface of another device.

  Moreover, although this embodiment demonstrated the case where the molten metal cleaning apparatus 1 was installed in the drawing-out chamber 4 of the continuous processing furnace 2, you may provide in the holding furnace and melting furnace which hold | maintain a molten metal, for example. Moreover, for example, the molten metal cleaning apparatus 1 in the present embodiment uses an apparatus that performs both the degassing process and the degassing process, but an apparatus that performs at least one of them may be used.

It is the perspective view which showed the molten metal cleaning apparatus which concerns on 1st embodiment. It is the side view which showed the molten metal cleaning apparatus which concerns on 1st embodiment. It is the II sectional view taken on the line of FIG. It is an expansion front sectional view of the molten metal cleaning apparatus concerning a first embodiment. It is the model top view which showed the movement state of the rotary rotor which concerns on 1st embodiment. It is the side view which showed the modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Melt cleaning apparatus 2 Continuous processing furnace 3 Melting furnace 4 Pumping chamber 6 Outlet 7a-7d Wall part 8a Bottom face 10 Rotating rotor 11 Holding jig 12 Moving means 13 Connecting tool 22 Shaft 23 Rotor 41a Wheel roller 41b Wheel Roller 42 Shaft M1 First drive M2 Second drive U Inner corner Y Metal melt

Claims (10)

A molten metal cleaning method for performing at least one of a degassing process and a degassing process in a pumping chamber for holding a molten metal,
A molten metal cleaning method, comprising: moving a rotor of a rotary rotor that stirs the molten metal and releases an inert gas along a peripheral edge of a bottom surface of the pumping chamber.   The molten metal cleaning method according to claim 1, wherein the rotor of the rotating rotor is continuously moved away from the bottom surface of the pumping chamber by a fixed distance.   The molten metal cleaning method according to claim 1, wherein the moving speed of the rotating rotor is slowed or stopped, and the inner corner of the pumping chamber is intensively stirred. A molten metal cleaning method for performing at least one of a degassing process and a degassing process in a pumping chamber for holding a molten metal,
A molten metal cleaning method, comprising: operating a rotor of a rotary rotor that stirs the molten metal and releases an inert gas at an inner corner of the pumping chamber. A rotating rotor that stirs the molten metal and releases inert gas;
A first drive unit for rotating the rotating rotor;
A holding jig that holds the rotating rotor movably above the pumping chamber that holds the molten metal,
Moving means for moving the rotary rotor along the holding jig,
The molten metal cleaning apparatus, wherein the holding jig is formed along a peripheral edge portion of a bottom surface of the pumping chamber. The moving means is
A wheel roller that rotates and moves along the holding jig;
A second drive unit for driving the wheel roller;
The molten metal cleaning apparatus according to claim 5, further comprising: a shaft portion that transmits the drive of the second drive portion to the wheel roller.   The molten metal cleaning apparatus according to claim 6, wherein the wheel roller is formed on both sides of the rotating rotor.   The said holding jig is suspended via the coupling tool from the suspension surface formed above the said drawing-out chamber, The Claim 5 thru | or 7 characterized by the above-mentioned. Molten metal cleaning equipment.   The molten metal cleaning apparatus according to any one of claims 5 to 7, wherein the holding jig is fixed to the pumping chamber via a connecting member. The rotary rotor includes a rotor at a tip of a shaft, and a maximum cross-sectional area of the rotor is 1/8 or less of an area of a bottom surface of the pumping chamber. The molten metal cleaning apparatus according to 9.

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