JP2010075951A - Foreign matter removal device for molten metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foreign matter removal device for a molten metal where the same passage of a molten metal is changed into a molten metal discharge passage or a molten metal suction passage with a simple constitution, and without back-washing foreign matters captured by a filter, a molten metal freed from foreign matter can be discharged. <P>SOLUTION: A molten metal 2 in a vessel 3 is discharged via a molten metal passage 5, and further, the molten metal is sucked into the vessel 3. The edge part 5b of the molten metal passage is provided with a filter 6 made of a material having a specific gravity lower than that of the molten metal in a floating state. Upon the suction of the molten metal, the filter 6 is depressed, and the molten metal does not pass through the filter 6 and passes through a gap made between a passage port and the filter 6 so as to flow into a storage vessel 3. Upon the discharge of the molten metal, the filter 6 covers the passage port of the edge part 5b, and the molten metal passes through the filter 6 and is discharged. In this way, only upon the discharge of the molten metal, foreign matters are captured by the filter 6, and the foreign matter sticks to the lower face side of the filter 6. Thus, the phenomenon that the foreign matter at the upper face side of the filter is back-washed and is intruded into the molten metal upon the discharge of the molten metal does not occur, and a clean molten metal can be discharged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for purifying a molten metal, and more particularly to an apparatus for removing foreign matter from a molten metal using a filter that captures foreign matters mixed in the molten metal.

Inclusion of inclusions in the molten metal greatly affects the quality of the cast product, for example, in the casting process. Therefore, conventionally, an apparatus or a removal method for removing oxides and impurities present in the molten metal using a filter has been developed.
For example, in Patent Document 1 shown below, there is a filter package for a molten metal attached to a molten metal flow path of a container, the filter having a wide area in which the molten metal passage direction faces the side wall direction inside the container. A usable molten metal filter package is disclosed.
Further, in Patent Document 2 shown below, when a molten metal in a furnace is cast into a mold due to a pressure difference between a holding furnace or a melting furnace and a mold or a mold, a ceramic filter attached to the lower end of the stalk and inside the stalk. Discloses a casting apparatus that filters oxides and impurities of the molten metal and prevents entanglement in the cavity to enable production of high-quality castings.
Further, in Patent Document 3 shown below, a low casting pressure chamber for storing molten metal, a molten metal supply pipe for supplying molten metal to the low casting pressure chamber, and a low casting pressure chamber are arranged up and down. It has a stalk that extends in the direction and its upper end opening is connected to the mold, and a return hot water chamber that is connected to the low casting pressurization chamber by a return hot water transfer pipe. There is disclosed a molten metal supply apparatus configured to extend and enter into an opening of a pipe facing a low casting pressure chamber.

Japanese Utility Model Publication No. 61-87656 JP-A-2-241656 JP 2008-178914 A

However, although Patent Documents 1 and 2 disclose providing filters for sucking and adhering foreign matters mixed in the molten metal, these filters are attached so as not to move and drop off. That is, it was a fixed filter. Therefore, when the molten metal in the container and the holding furnace is discharged into the mold, foreign matter mixed in the molten metal in the container or the like can be removed by the filter, but the discharged molten metal is sucked into the container or the like. When the water is melted, the molten metal flows through the filter from the mold side to the container or the like, so that foreign matter mixed in the molten metal on the mold side is captured by the surface of the filter on the mold side, When the hot water is poured into the mold, the foreign matter trapped on the mold side surface is backwashed and mixed into the molten metal.
Patent Document 3 discloses that the flow path of the molten metal is different between the hot water (through the molten metal supply pipe) to the stalk and the hot water (through the return molten metal transfer pipe), With this configuration, it is possible to prevent foreign matter from being mixed into the molten metal at the time of tapping. However, Patent Document 3 has a configuration in which the hot water supply route and the hot water supply route are provided as completely different routes, so that the configuration is complicated and the equipment cost of the molten metal supply device increases. .

  Therefore, the present invention has been made in view of such circumstances, and the same flow path of molten metal can be switched to a hot water flow path or a hot water flow path with a simple configuration, and foreign matter captured by a filter can be reversed. It is an object of the present invention to provide a foreign matter removing apparatus for molten metal that can discharge a molten metal from which foreign matters have been removed without washing.

  In order to solve the above-mentioned problems, the foreign matter removing apparatus for molten metal according to the present invention is characterized by having the following configurations.

(Aspect of the Invention)
As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the technology described in this specification, and is intended to limit the technical features described in this specification and combinations thereof to those described in the following sections. Absent. In other words, the technical features should be interpreted in consideration of the description accompanying each section, the description of the examples, etc. Moreover, the aspect which deleted the component from the aspect of each term can also become one aspect. In the following items, each of items (1) to (5) corresponds to each of items 1 to 5.

(1) The molten metal stored in the container is discharged (hot water) to the outside of the container, and the molten metal is sucked into the container from the outside of the container (hot water) and mixed into the molten metal. In the foreign matter removal apparatus for molten metal that removes the foreign matter that has been removed with a filter,
A molten metal flow path that extends from the container to the outside, and in which the molten metal can flow in two directions, the direction of the hot water or the direction of suction;
A metal melt purification filter provided in a floating state at either one of the container side or the outer side of the molten metal flow path,
When the molten metal flows in the direction of the tapping hot water, the molten metal purification filter is directed to cover the molten metal flow path without gap so that the molten metal passes through the molten metal purification filter and is purified. When the molten metal flows in the suction direction, the molten metal moves in a direction in which a gap is formed between the molten metal flow path port and the molten metal purification filter so that the molten metal does not pass through the molten metal purification filter. An apparatus for removing foreign matter from molten metal.

  Molten metal discharge and absorption are performed by the melt control means (device). For example, atmospheric pressure adjusting means can be provided on the container side as molten metal control means. In this case, the container needs to be in an airtight state. With the air tightness of the container secured, the pressure inside the container is increased or decreased by the air pressure adjusting means, so that the molten metal stored in the container can be easily discharged from the container to the outside through the molten metal flow path. Alternatively, the hot water can be sucked into the container from the outside.

  The molten metal flow path on the container side extends through the container in the up-down direction, and the tip end (molten flow path port) reaches near the bottom surface of the container. On the other hand, the molten metal flow path on the outer side extends to, for example, a melting furnace or a holding furnace of a casting machine where the molten metal is discharged. The molten metal flows in two directions in the molten metal flow path from the container side to the outside when discharging and from the outside to the container when sucking the molten metal. Examples of the member constituting the molten metal flow path include a cylindrical pipe.

The molten metal purification filter is not fixed to the molten metal flow path or the container, but is provided in a floating state in the molten metal. And it is provided in the edge part of the container side of a molten metal flow path, or the exterior side. This filter may be provided only at the end portion on either one of the above or may be provided at the end portions on both sides. Examples of the material of the filter include a refractory material made of SiO ₂ and Al ₂ O ₃ , or a wire mesh provided with a refractory coating.

  When the molten metal flows in the direction of the molten metal, that is, from the container side to the outside, the metal molten metal purifying filter moves in the molten metal toward the mouth of the molten metal flow path, and covers the entire surface of the mouth with the filter. When the metal melt purifying filter is provided at the end on the container side, the filter moves to the molten metal flow path port on the container side, and when provided at the end on the external side, the molten metal flow path port on the external side. To cover each channel opening without any gaps. Thereby, the molten metal discharged through the molten metal flow path passes through the molten metal purification filter, and foreign matters (inclusions) mixed in the molten metal are removed by the filter. On the other hand, when the molten metal flows in the direction of the molten metal, that is, when the molten metal flows from the outside to the container side, the metal molten metal purification filter is separated from the flow path port covered at the time of discharging the molten metal by the flowing pressure of the molten metal Move to. As a result, a gap is formed between the molten metal flow path opening and the metal molten metal purification filter, and the sucked molten metal (including mixed foreign matter) flows to the container side through this gap. That is, the sucked molten metal does not pass through the metal melt purifying filter, and therefore the foreign matter in the sucked molten metal is not removed by the filter.

  With such a configuration, it is possible to remove foreign matters in the molten metal only when the molten metal is discharged from the container by the metal melt purification filter. As a result, the foreign matter in the molten metal adheres only to the container-side surface of the two surfaces, the container-side surface and the external-side surface, of the molten metal purification filter disposed. Therefore, no foreign matter adheres to the external surface of the metal melt purifying filter, so that even if the molten metal flows through the filter at the time of hot water, the foreign material on the external surface is washed back to It is not mixed in the molten metal, and a clean molten metal from which foreign matters are removed can be discharged to the outside.

(2) The molten metal foreign matter removing apparatus according to (1), wherein the molten metal purification filter is made of a material having a specific gravity smaller than that of the molten metal.
By adopting such a configuration, in the molten metal, the filter rises by buoyancy unless an external force is applied from others. Therefore, when it is necessary to move the filter in the upward direction, it can be moved more easily and accurately than when the filter is moved only by the flow pressure of the molten metal.

  (3) The metal melt purification filter has a cylindrical shape with a bottom, is disposed so as to cover the end of the molten metal flow path on the container side, and the metal melt flows in the direction of the tapping water, Due to the buoyancy of the filter and the flow pressure of the molten metal, the molten metal purifying filter moves in a direction to be pressed against the molten metal flow path port to cover the molten metal, and when the molten metal flows in the suction direction, the molten metal sucked in The molten metal purification filter is moved in a direction away from the molten metal flow path port by the flow pressure of the molten metal, and a gap through which the sucked molten metal flows is formed between the molten metal flow channel port and the molten metal flow channel port. Or the foreign material removal apparatus of the molten metal of Claim 2.

In this embodiment, the molten metal purification filter is provided at the end of the molten metal flow path on the container side. The mouth width of the metal melt purifying filter is formed wider than the mouth width of the melt flow path, and is disposed in a state where the end of the melt flow path is inserted into the cylindrical filter. Then, the filter in the floating state moves up and down by the flow pressure of the molten metal or the molten metal, and the depth of insertion changes. When the molten metal flows in the direction of the molten metal, the molten metal purification filter moves upward (in the direction in which the depth of insertion becomes deeper) due to the buoyancy of the filter and the flow pressure of the molten metal, and the bottom portion of the filter. Is pressed into the mouth portion of the molten metal channel without a gap. Thereby, the molten metal to be discharged flows through the filter and flows to the outside via the molten metal flow path. At this time, the molten metal flows in from the bottom surface side of the metal melt purifying filter that does not contact the molten metal flow passage port, so that foreign matter in the molten metal is also captured from the non-contacting filter surface and attached to and removed from the surface. The

  On the other hand, when the molten metal flows in the direction of the molten metal, the molten metal purification filter is separated from the molten metal flow path port by the flow pressure of the molten metal by the molten metal, and is pushed downward (in the direction in which the depth of insertion becomes shallow). Move to. The filter maintains its bottom in contact with the bottom of the container by the molten metal flow pressure. At this time, since the opening width of the filter is larger than the melt flow path opening width, a gap is formed between the melt flow path opening and the pushed-down filter, and the molten metal absorbed in the gap flows. That is, the absorbed molten metal flows into the container without passing through the filter. Accordingly, the foreign matter in the molten metal is not captured by the filter and flows into the container while being mixed in the molten metal. The length of the metal melt purification filter in the vertical direction (the height of the cylindrical filter) is longer than the distance from the melt flow path port to the bottom surface of the container, so that the filter is pushed down to the bottom surface of the container. In this case, the state in which the end of the molten metal flow path is inserted into the filter is maintained, so that the filter does not fall off.

  With this configuration, in the same manner as in the above aspect (1), it is possible to remove foreign substances in the molten metal only with the molten metal purifying filter only when the molten metal is discharged from the container. Foreign matter in the molten metal adheres, and foreign matter does not adhere to the outer surface of the filter. Therefore, even if the molten metal flows through the filter at the time of discharging, the foreign matter on the outer surface is not back-washed and mixed into the molten metal, and a clean molten metal from which foreign matter has been removed is You can take a bath.

  (4) The molten metal flow path end on the container side is formed to be thicker than the other molten metal flow path parts, and the molten metal purification filter is narrower than the flow path at the molten metal flow path end and The buoyancy of the filter and the flow pressure of the molten metal when the molten metal flows in the direction of the molten metal and has a width wider than the flow path of the other molten metal flow path portion. The metal molten metal purifying filter moves in a direction to be pressed against the mouth of the other molten metal flow path and covers the mouth, and when the molten metal flows in the suction direction, The metal molten metal purifying filter moves in a direction away from the mouth of the other molten metal flow path, and forms a gap through which the drawn molten metal flows in the molten metal flow path end. The foreign material removal apparatus of the molten metal as described in a term.

  In this embodiment, the molten metal purification filter is provided at the end of the molten metal flow path on the container side. The end of the molten metal channel on the container side is formed wider than the channel width other than the end. That is, the molten metal flow path is thick at the end, and when looking into the flow path from the flow path opening, the flow path having a small diameter continues at the center of the end of the end opening having a large diameter. The metal melt purifying filter is provided in the end of the flow path. The filter is formed such that its diameter (width) is larger than the diameter (width) of the narrow channel so that it does not enter into the narrow channel following the end due to the buoyancy of the filter or the flow pressure of the molten metal during tapping. Has been. Moreover, it is formed in a diameter (width) smaller than the diameter (width) of the end channel so that a gap is formed between the end channel and the channel side wall. Examples of the shape of the filter include a cylindrical shape, a conical shape, a truncated cone shape, and a spherical shape. Further, in order to prevent the filter from being discharged to the outside (inside the container) from the opening at the end of the molten metal flow path, a discharge preventing means is provided at the end opening. For example, a wire mesh having a roughness that prevents the filter from popping out may be provided at the end opening.

  The molten metal purifying filter in a floating state moves in the vertical direction in the end of the molten metal flow path by the flow pressure of the molten metal discharged or absorbed. When the molten metal flows in the direction of the molten metal, the filter moves upward due to the buoyancy of the filter and the flow pressure of the molten metal due to the molten metal, and is pressed against the mouth portion of the thin molten metal channel without any gap. Thereby, the molten metal discharged from the hot water flows through the filter to the outside. At this time, since the molten metal flows in from the molten metal purification filter surface on the side not in contact with the molten metal flow passage port, foreign matter in the molten metal is also captured from the non-contacted filter surface and removed by adhering to the surface side. .

  On the other hand, when the molten metal flows in the direction of the molten metal, the molten metal purification filter moves away from the narrow molten metal flow passage port by the molten metal flow pressure by the molten metal so as to be pushed downward. The filter comes into contact with the discharge preventing means by the flow pressure of the molten metal. As a result, a gap is formed between the narrow molten metal flow passage opening and the filter. Further, since the filter diameter (width) is smaller than the diameter (width) of the melt flow path end, a gap is also formed between the filter and the side wall of the flow path end. The sucked molten metal flows into the container through this gap. That is, the molten metal that has been absorbed flows into the container without passing through the metal melt purification filter. Accordingly, the foreign matter in the molten metal is not captured by the filter and flows into the container while being mixed in the molten metal.

  With such a configuration, as in the above-described aspect (1), it is possible to remove foreign substances in the molten metal by the molten metal purification filter only when the molten metal is discharged from the container. As a result, the surface of the filter on the container side Only the foreign matter in the molten metal adheres to the surface, and the foreign matter does not adhere to the outer surface of the filter. Therefore, even if the molten metal flows through the filter at the time of discharging, the foreign matter on the outer surface is not back-washed and mixed into the molten metal, and a clean molten metal from which foreign matter has been removed is You can take a bath.

  (5) Inside the molten metal flow path end on the outside side, a portion excluding the flow path opening is partitioned into two or more divided molten metal flow paths by a partition wall provided along the flowing direction of the molten metal. The molten metal purification filter is provided in one of the two or more molten metal flow paths, and the flow path opening is formed with a narrower width than the width of the molten metal purification filter. And when the molten metal flows in the direction of the molten metal, the molten metal purifying filter moves in a direction to be pressed against the flow path opening by the flow pressure of the molten molten metal, and covers the opening. When flowing in the direction of suction, the metal molten metal purifying filter moves in the one partition molten metal flow path in a direction away from the molten metal flow path port by the buoyancy of the filter and the flow pressure of the sucked molten metal, and the suction Was Foreign matter removing apparatus of the molten metal according to form to claim 1 or 2, characterized in between the launder outlet a gap genus melt flows.

  In this embodiment, the molten metal purification filter is provided at the end of the molten metal channel on the outside. A part of the molten metal flow path end portion is formed with a plurality of divided molten metal flow paths that are partitioned by a partition wall and extend along the molten metal flow path direction. The partition wall is not formed near the distal end portion of the molten metal flow path, and the molten metal flow path is a single molten metal flow path that communicates with all of the divided molten metal flow paths. The metal melt purification filter is provided only in one of the plurality of partition molten metal channels. The opening of the molten metal flow path is provided below the partition molten metal flow path provided with the filter, and has a diameter (width) smaller than the diameter (width) of the filter so that the filter is not discharged outside the flow path. Is formed. Furthermore, the container side end of the partition molten metal flow path provided with the filter is formed with a flow path width smaller than the diameter (width) of the filter so that the filter is not discharged from the partition molten metal flow path. Yes.

  The molten metal purifying filter in a floating state moves in the vertical direction in the end of the molten metal flow path by the flow pressure of the molten metal discharged or absorbed. When the molten metal flows in the direction of the molten metal, the filter moves so as to be pushed downward by the molten metal flow pressure by the molten metal, and is pressed against the mouth portion of the molten metal channel without any gap. Thereby, the molten metal to be discharged flows through the filter to the outside. At this time, since the molten metal flows in from the molten metal purification filter surface on the side not in contact with the molten metal flow passage port, foreign matter in the molten metal is also captured from the non-contacted filter surface and removed by adhering to the surface side. .

  On the other hand, when the molten metal flows in the molten metal direction, the molten metal purification filter moves upward away from the molten metal flow path port due to the buoyancy of the filter and the flow pressure of the molten metal due to the molten metal. The filter is pressed against the container side end of the partition molten metal flow path by the molten metal flow pressure. As a result, a molten metal flow path that continues from the molten metal flow path opening to the partitioned molten metal flow path that is not provided with a filter is formed, and the sucked molten metal does not pass through the divided molten metal flow path that is provided with the filter, and is easily flown. It passes through a partition molten metal flow path that is not provided. That is, the molten metal that has been absorbed flows into the container without passing through the metal melt purification filter. Accordingly, the foreign matter in the molten metal is not captured by the filter and flows into the container while being mixed in the molten metal.

  With such a configuration, as in the above-described aspect (1), it is possible to remove foreign substances in the molten metal by the molten metal purification filter only when the molten metal is discharged from the container. As a result, the surface of the filter on the container side Only the foreign matter in the molten metal adheres to the surface, and the foreign matter does not adhere to the outer surface of the filter. Therefore, even if the molten metal flows through the filter at the time of discharging, the foreign matter on the outer surface is not back-washed and mixed into the molten metal, and a clean molten metal from which foreign matter has been removed is You can take a bath.

  According to the present invention, the molten metal purifying filter is disposed in a floating state, and the filter is moved by the flow pressure of the molten metal and the flow pressure of the molten metal, and the buoyancy of the filter, so that the same flow path is connected to the outlet flow path or the suction path. With a simple configuration of switching to the hot water flow path, foreign substances in the molten metal can be removed, and a clean molten metal can be discharged without mixing foreign substances captured by the filter into the molten metal by backwashing.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiments, and includes various embodiments based on the knowledge of those skilled in the art, including the embodiments described in the above section (Aspects of the Invention). It can be carried out in a modified or improved manner.

  FIG. 1 is a cross-sectional view showing one embodiment of a foreign matter removing apparatus for the molten metal. In this form, the molten metal purification filter provided in a floating state in the molten metal is switched between the hot water flow path and the hot water flow path by removing the foreign matter in the molten metal only at the time of the hot water, This eliminates backwashing of the filter by the hot water and tries to discharge a clean molten metal.

  The foreign matter removing apparatus 1 for the molten metal includes a storage container 3 in which the molten metal 2 is stored, a molten metal flow path 5 extending from the storage container 3 to the outside, and a container side end of the molten metal flow path 5. The metal melt purification filter 6 provided and the atmospheric pressure adjusting means 7 for adjusting the atmospheric pressure in the storage container 3 are roughly configured. The molten metal purification filter 6 is made of a material having a specific gravity smaller than that of the molten metal 2, and is disposed in a floating state in the molten metal 2. Therefore, in a state where no external force is applied to the filter 6, the inside of the molten metal 2 rises to the top of the container 3 due to the buoyancy of the filter 6.

As shown in FIG. 1, the molten metal purification filter 6 has a cylindrical shape with a bottom, and its diameter (width) R1 is larger than the diameter (width) R2 of the molten metal flow path 5, An end of the molten metal flow path 5 is disposed in a state of being inserted into the filter 6. The material of the filter 6 is made of a refractory material such as SiO ₂ or Al ₂ O ₃ , or a wire mesh provided with a fireproof coating.

  The storage container 3 is composed of an airtight container. By reducing the atmospheric pressure in the container 3 by the atmospheric pressure adjusting means 7, the molten metal is absorbed from the outside of the container to the inside of the container via the molten metal flow path 5. Further, by pressurizing the atmospheric pressure in the container 3 by the atmospheric pressure adjusting means 7, the molten metal can be discharged from the inside of the container to the outside of the container via the molten metal flow path 5.

  FIG. 2 is a view showing a state in which the atmospheric pressure in the storage container 3 is reduced by the atmospheric pressure adjusting means 7 and the molten metal is sucked (absorbed) into the container 3. FIGS. 3A and 3B are diagrams showing the movement of the molten metal purification filter 6 when the molten metal is sucked and the flow of the sucked molten metal. The end of the molten metal flow path 5 opposite to the container side extends to, for example, a melting furnace or a hand holding furnace 10 of a casting machine. When the pressure in the storage container 3 is reduced, the molten metal in the melting furnace 10 flows from the end 5a on the melting furnace side of the molten metal flow path 5 and is sucked into the storage container 3 as indicated by arrows. The

  The molten metal purifying filter 6 in the state shown in FIG. 1 by the flow pressure of the molten metal in the direction of the arrow due to the suction, that is, the bottom 6a of the filter is brought into the channel opening of the end 5b of the molten metal channel by the buoyancy of the filter 6. The filter 6 that has been pressed is gradually pushed down toward the bottom 3a of the storage container 3 as shown in FIGS. 3 (a) and 3 (b). As a result, a gap is formed between the channel opening of the end 5b of the molten metal flow path and the metal molten metal purification filter 6, and the sucked molten metal flows into the storage container 3 through the path indicated by the arrow M. Therefore, the molten metal does not pass through the molten metal purification filter 6, and the foreign matter mixed in the molten metal flows into the storage container 3 together with the molten metal without being captured by the filter 6. As shown in FIG. 3B, the height H1 of the molten metal purification filter 6 is longer than the distance H2 from the tip of the molten metal flow path 5 to the bottom 3a of the container. Even when 6 is pushed down to the bottom 3a, the end 5b of the flow path is in the state of being inserted into the filter 6, so that the filter 6 does not come off from the end 5b of the molten metal flow path.

  FIG. 4 is a view showing a state in which the atmospheric pressure in the storage container 3 is pressurized by the atmospheric pressure adjusting means 7 and the molten metal in the container 3 is discharged. FIG. 5 is a diagram showing the movement of the molten metal purification filter 6 when the molten metal is discharged and the flow of the discharged molten metal. When the atmospheric pressure in the storage container 3 is increased, the molten metal in the storage container 3 flows from the end 5b of the molten metal flow path 5 on the storage container 3 side as indicated by an arrow, and is discharged into the melting furnace 10 or the like. Is done.

  The filter 6 is pushed upward in the storage container 3 by the buoyancy of the molten metal purification filter 6 and the flowing pressure of the molten metal in the direction of the arrow as shown in FIG. Thereby, the molten metal flow path 5 is inserted to the back of the filter 6, and the flow path opening of the molten metal flow path end 5 b is covered with the bottom 6 a of the filter 6 without a gap. As indicated by an arrow N, the molten metal 2 passes through the filter 6 and flows into the molten metal flow path 5. At this time, the foreign material 11 in the molten metal is captured by the filter 6, and the captured foreign material 11 adheres to the lower surface of the filter bottom 6a. As described with reference to FIG. 3, since foreign matter mixed in the molten metal at the time of absorbing water is not captured by the filter 6, the foreign matter adheres to the upper surface of the filter bottom portion 6a (surface on the side in contact with the flow path port). Absent. Therefore, the foreign substance of the filter is not back-washed by the flow of the molten metal (the flow indicated by the arrow N) at the time of tapping, and a clean molten metal can be supplied to the melting furnace 10 side.

FIG. 6 shows an embodiment of a metal melt purification filter. (A) is a filter having a cylindrical shape, and (b) is a filter having a rectangular tube shape. Each of them has a bottom at the lower end, and is composed of a refractory material made of SiO ₂ or Al ₂ O ₃ or a wire mesh provided with a refractory coating as described above. The end of the molten metal flow path is inserted into the cylinder for use. In addition, what is necessary is just to adapt to the shape of the molten metal flow path 5, and it is not limited to these forms.

  FIG. 7 is a partial cross-sectional view showing another embodiment of the metal melt purifying filter. The filter described above uses a material having a specific gravity smaller than that of the molten metal, but in the embodiment shown in FIG. 7, a material having a specific gravity greater than that of the molten metal is used. In this case, for example, of the filter 6 having a cylindrical shape, only the bottom 6a is used as a part having a filter function, and a material having a large specific gravity is used for the bottom. The other part (side wall part) is made of a material having a specific gravity smaller than that of the molten metal, and is lifted in the molten metal by its buoyancy. Specifically, for example, the inside of the side wall may be made of a hollow and porous material to reduce the specific gravity.

  In FIG. 8, the other form of the position which provides the filter for metal molten metal purification | cleaning is shown. In this aspect, the molten metal purification filter 6 is provided in the end 5b of the molten metal flow path 5 on the storage container 3 side. The figure (a) shows the state of the filter 6 when the molten metal is sucked into the storage container 3, and the figure (b) shows the state of the filter 6 when the molten metal is discharged from the storage container 3. Show. The diameter (width) R4 of the end 5b of the molten metal flow path is formed larger than the diameter (width) R3 of the flow path other than the end. The diameter (width) R5 of the molten metal purification filter 6 is larger than the diameter R3 and smaller than the diameter R4. Further, a discharge preventing means 20 made of, for example, a coarse mesh is provided at the mouth of the molten metal flow path end 5b so that the filter 6 is not discharged from the flow path end.

  As shown in FIG. 8A, when the molten metal is sucked, the molten metal purification filter 6 is moved by the flow pressure of the molten metal due to suction and is pushed downward until it contacts the wire mesh 20. As a result, gaps are generated between the mouth 21 of the channel other than the end and the filter 6 and between the inner wall of the end 5b and the filter 6, and the molten metal is indicated by an arrow P with the gap as the channel. Flowing in any direction. Accordingly, since the sucked molten metal flows into the container without passing through the metal molten metal purification filter 6, foreign matter in the molten metal is not captured by the filter 6, but flows into the container while being mixed in the molten metal.

  On the other hand, as shown in FIG. 8 (b), when the molten metal is discharged, the molten metal purification filter 6 is moved by the buoyancy of the filter 6 and the flow pressure of the molten metal discharged, and the flow other than the end portion is moved. It is pushed up until it contacts the mouth 21 of the road. As a result, the filter 6 covers the channel opening 21 without a gap and is pressed against the opening 21. Therefore, since the molten metal to be discharged flows through the filter 6 and flows to the outside as indicated by an arrow Q, the foreign matter 11 in the molten metal is captured by the filter 6. The foreign material 11 adheres to the filter surface on the side where the molten metal flows.

  With such a configuration, the foreign matter 11 in the molten metal is removed by the molten metal purification filter 6 only when the molten metal is discharged from the storage container 3. As a result, the foreign matter 11 adheres only to the container-side surface of the filter 6 and does not adhere to the external-side surface of the filter. Therefore, even if the molten metal flows through the filter 6 when the hot water is discharged, the outer surface of the filter 6 is back-washed so that no foreign matter is mixed into the molten metal. The metal melt that has been removed is discharged.

  In FIG. 9, the other form of the position which provides the filter for metal molten metal purification | cleaning is shown. In this aspect, the molten metal purification filter 6 is provided in the end 5a of the molten metal flow path 5 on the outside side (for example, the melting furnace 10 side). The figure (a) shows the state of the filter 6 when the molten metal is discharged from the storage container 3, and the figure (b) shows the state of the filter 6 when the molten metal is sucked into the storage container 3. ing. The inside of the end portion 5a is divided into a plurality of molten metal flow paths by a partition wall. In this embodiment shown in FIG. 9, the partition wall 30 provided along the metal channel is divided into two partition molten metal channels 31 and 32. The partition wall 30 is formed in a part of the region 34 except for the region 33 at the front end, and in the region 33 at the front end without the partition wall 30, one flow channel where the partition molten metal channels 31 and 32 merge. It has become. The molten metal purification filter 6 is provided in one partition molten metal flow path 32 and moves in the vertical direction in the partition molten metal flow path 32. The molten metal flow path port 35 is provided below the partition molten metal flow path 32, and its diameter (width) R6 is smaller than the diameter (width) R7 of the metal melt purification filter. Furthermore, the end of the upper side of the partition molten metal flow path 32 (the side opposite to the side where the flow path port 35 is provided) is arranged so that the metal melt purification filter 6 is not discharged from the partition molten metal flow path 32. The flow path diameter (width) R8 is formed smaller than the diameter (width) R7 of the filter 6.

  As shown in FIG. 9A, when the molten metal is discharged, the molten metal purification filter 6 moves in the partition molten metal flow path 32 due to the fluid pressure of the molten metal and comes into contact with the flow path port 35. It is pushed down. Since the height H3 of the filter 6 is larger than the height H4 of the region 33 without the partition wall 30, a part of the filter 6 pushed downward is inserted into the partition molten metal flow path 32. In contact with the flow path port 35 in a state where a part is engaged with the partition wall 30. Accordingly, the filter 6 is pressed against the flow path port 35 and covers the flow path port 35 without a gap. Of the molten metal to be discharged, the molten metal that passes through the partition molten metal flow path 32 passes through the filter 6 along the path indicated by the arrow S, and the molten metal that passes through the divided molten metal flow path 31 corresponds to the path indicated by the arrow T. It passes through the filter 6 and flows to the flow path port 35. At this time, the foreign material 11 in the molten metal is captured and removed by the filter 6.

  On the other hand, as shown in FIG. 9B, when the molten metal is absorbed, the molten metal purification filter 6 moves up the partition molten metal flow path 32 by the buoyancy of the filter 6 and the molten metal flow pressure. It moves in the direction (direction away from the flow path port 35). As a result, the molten metal sucked from the flow path port 35 does not flow through the partition molten metal flow path 32 where the filter 6 exists (high resistance), and the flow of the divided molten flow path 31 where the filter 6 does not exist easily flows by the arrow U. It flows in the direction shown. That is, since the sucked molten metal flows into the container without passing through the metal molten metal purification filter 6, foreign matter in the molten metal is not captured by the filter 6, but flows into the container while being mixed in the molten metal.

  With such a configuration, the foreign matter 11 in the molten metal is removed by the molten metal purification filter 6 only when the molten metal is discharged from the storage container 3. As a result, the foreign matter 11 adheres only to the container-side surface of the filter 6 and does not adhere to the external-side surface of the filter. Therefore, even if the molten metal flows through the filter 6 at the time of pouring, foreign matters on the outer surface are not back-washed and mixed into the molten metal. Molten metal can be discharged.

It is a figure which shows one form of the foreign material removal apparatus of the molten metal which concerns on this invention. It is a figure which shows a mode that the molten metal is attracted | sucked in the container with the foreign material removal apparatus of the molten metal which concerns on this invention. (A), (b) is a figure which shows a mode that the filter for metal molten metal movement when a molten metal is attracted | sucked and the flow of the attracted molten metal. It is a figure which shows a mode that the molten metal of a container is poured out with the foreign material removal apparatus of the molten metal which concerns on this invention. It is a figure which shows the movement of the filter for metal molten metal purification when a molten metal is discharged, and the flow of the molten metal discharged. (A), (b) is a figure which shows one form of the filter for metal molten metal purification | cleaning. It is a partial cross section figure which shows the other form of the filter for metal molten metal purification | cleaning. It is a figure which shows one form of the position which provides the filter for metal molten metal purification | cleaning, (a) is this filter when a metal molten metal is absorbed in this form, (b) is this filter when a metal molten metal is discharged FIG. It is a figure which shows the other form of the position which provides the filter for metal molten metal purification | cleaning, (a) in this form, when a molten metal is poured out, (b) is the said when a molten metal is absorbed It is a figure which shows the mode of a filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foreign material removal apparatus of molten metal 2 Molten metal 3 Storage container 5 Molten flow path 5a, 5b End part 6 Metal molten metal purification filter
7 Atmospheric pressure adjusting means 11 Foreign matter 30 Partition walls 31 and 32
Partition metal flow path

Claims (5)

Molten metal stored in a container is discharged to the outside of the container, and the molten metal is sucked into the container from the outside of the container, and foreign matter mixed in the molten metal is removed by a filter. In the foreign matter removing device,
A molten metal flow path that extends from the container to the outside, and in which the molten metal can flow in two directions of the direction of the hot water and the direction of the suction;
A metal melt purification filter provided in a floating state at either one of the container side or the outer side of the molten metal flow path,
When the molten metal flows in the direction of the tapping hot water, the molten metal purification filter is directed to cover the molten metal flow path without gap so that the molten metal passes through the molten metal purification filter and is purified. When the molten metal flows in the suction direction, the molten metal moves in a direction in which a gap is formed between the molten metal flow path port and the molten metal purification filter so that the molten metal does not pass through the molten metal purification filter. An apparatus for removing foreign matter from molten metal.   2. The metal melt foreign matter removing device according to claim 1, wherein the metal melt purifying filter is made of a material having a specific gravity smaller than that of the metal melt.   The metal melt purification filter has a cylindrical shape with a bottom, is disposed so as to cover the end of the melt flow path on the container side, and when the metal melt flows in the direction of the tapping water, When the metal melt flows in the direction of suction by moving in a direction to be pressed against the melt flow path port by buoyancy and molten metal flow pressure, the metal melt flows away from the melt flow path port by the flow pressure of the sucked melt The metal melt foreign matter removing device according to claim 1, wherein a gap is formed between the molten metal flow passage opening and the molten metal flow path port. The molten metal flow path end on the container side is formed thicker than other molten metal flow path parts, and the metal melt purifying filter is narrower than the flow path at the molten metal flow path end and the other A width wider than the flow path of the molten metal flow path portion is provided in the molten metal flow path end,
When the molten metal flows in the direction of the molten metal, the filter for purifying the molten metal moves in a direction to be pressed against the mouth of the other molten metal flow path by the buoyancy of the filter and the flow pressure of the molten metal, and covers the mouth. When the molten metal flows in the suction direction, the molten metal purification filter is moved away from the other molten metal flow path by the flow pressure of the sucked molten metal, and the sucked molten metal is The foreign material removing apparatus for molten metal according to claim 1 or 2, wherein a flowing gap is formed in an end portion of the molten metal flow path. The inside of the outer end of the molten metal flow path is divided into two or more divided molten metal flow paths by a partition wall provided along the flowing direction of the molten metal, and the molten metal purifying filter is connected to the divided molten metal flow path. Provided in one of the partition molten metal flow paths, the melt flow path opening is formed with a narrower width than the width of the metal melt purification filter,
When the molten metal flows in the direction of the molten metal, the molten metal purifying filter moves in a direction to be pressed against the molten metal flow path port by the flow pressure of the molten metal, covers the port, and the molten metal is sucked by the suction. The metal melt purifying filter moves in the one partition molten metal flow path in a direction away from the molten metal flow path port by the buoyancy of the filter and the flow pressure of the sucked molten metal, and is sucked. The apparatus for removing foreign matter from molten metal according to claim 1 or 2, wherein a gap through which the molten metal flows is formed between the molten metal flow passage port.

Images