WO2013099471A1

WO2013099471A1 - Molten-metal filtration apparatus

Info

Publication number: WO2013099471A1
Application number: PCT/JP2012/079924
Authority: WO
Inventors: 辰己津山; 川口　一彦
Original assignee: 三井金属鉱業株式会社
Priority date: 2011-12-28
Filing date: 2012-11-19
Publication date: 2013-07-04
Also published as: JP5669718B2; CN103781921A; JP2013136812A; KR20140046058A; KR101547119B1; CN103781921B

Abstract

In a molten-metal filtration apparatus (10), one or a plurality of porous ceramic filtration tubes (41) having an opening (43) on one end, the other end being closed, are disposed inside a container body (20) for retaining molten metal such that the longitudinal direction of the tubes (41) is oriented in a direction intersecting a horizontal plane. A filtration unit (40) is formed by having at least one end of the filtration tubes (41) attached to a support plate (42) such that the longitudinal direction of the tubes (41) is substantially perpendicular to a surface of the support plate (42). Ideally the filtration unit (40) is disposed inside the container body (20) such that the surface of the support plate (42) is substantially coplanar with the horizontal plane.

Description

Metal melt filter

The present invention relates to a molten metal filter device for removing inclusions and the like present in various metal melts including aluminum and aluminum alloys.

When a molten metal made of a metal such as aluminum or an aluminum alloy contains inclusions or the like, this may cause defects in the cast when casting or the like. Etc. are done. As a filtration device for filtering such a molten metal, for example, a device in which one or a plurality of porous ceramic filter tubes are arranged horizontally in a molten metal reservoir is known. In such a filtering device, by flowing the molten metal from the outside to the inside of the filtration tube, inclusions and the like in the molten metal can be removed and the quality of the molten metal can be improved. Can be reduced. As such a filtration apparatus, the thing of patent document 1 and 2 is known, for example.

FIG. 5 schematically shows the structure of such a conventional filtration device 110. Both ends of the filtration tube 141 are instructed by a pair of support plates 142 called end plates, whereby a filtration unit 140 is formed. The filtration unit 140 is pressed into the can body portion 120 of the filtration device 110 by the wedge plate 190, and thereby the sealing property against the molten metal is maintained. In the figure, reference numeral 150 denotes a heater.

JP-A-5-195101 JP-A-9-137235

However, the extent to which the wedge plate 190 is pushed in may vary depending on the level of skill of the operator's work, resulting in variations in the sealing performance of the filtration unit 140. In addition, due to the fact that the filtration tube 141 pressed by the wedge plate 190 is disposed sideways, stress is generated along the longitudinal direction of the filtration tube 141. Further, the filter tube 141 is exposed to a high temperature while the molten metal is being filtered and thermally expands. Due to this, stress is generated along the longitudinal direction of the filter tube 141. These stresses make the filtration tube 141 susceptible to damage. If the degree of pressing of the wedge plate 190 is reduced for the purpose of reducing the stress, the sealing performance may be reduced and the molten metal may leak. Once a molten metal leaks, it takes time and effort to recover, and a great loss occurs.

The present invention has one or a plurality of porous ceramic filter tubes having an opening at one end and the other end closed, such that the longitudinal direction thereof faces in a direction intersecting the horizontal plane. The present invention provides a molten metal filtration device disposed in a can body portion that stores molten metal.

FIG. 1 is a plan view of the first embodiment of the molten metal filtration apparatus of the present invention viewed from above with the upper lid removed. FIG. 2 is a cross-sectional view taken along the line II-II in a state where the upper lid is attached in the filtration device shown in FIG. FIG. 3 is an exploded perspective view of the filtration device shown in FIGS. 1 and 2. FIG. 4 is a cross-sectional view showing the structure of the second embodiment of the molten metal filtration apparatus of the present invention. FIG. 5 is a cross-sectional view showing the structure of a conventional molten metal filter device.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 shows a plan view of a first embodiment of a molten metal filter device (hereinafter also simply referred to as “filter device”) according to the present invention as viewed from above with the upper lid removed. FIG. 2 is a cross-sectional view taken along the line II-II in a state where the upper lid is attached in the filtration device shown in FIG. FIG. 3 is an exploded perspective view of the filtration device shown in FIGS. 1 and 2. The filtration device 10 shown in FIGS. 1 to 3 includes a can body portion 20 and an upper lid 30 that covers the can body portion 20. The can body 20 and the upper lid 30 are each composed of a casing made of metal such as iron and a refractory lining.

The can body part 20 has a can body lower part tank 21 as a storage part for storing the molten metal, and an inner lid 22 arranged on the can body lower part tank 21. The can lower tank 21 has a bottom surface portion 21a that is rectangular in plan view, and four wall surface portions 21b that stand from four sides of the bottom surface portion. The four wall surface portions 21b are connected to each other. As a result, the can lower tank 21 has a rectangular parallelepiped space inside, and has an open top. In this space, a filtration unit 40 to be described later is arranged. Moreover, this space is filled with the molten metal when the molten metal is filtered. One of the four wall surfaces 21b is provided with a hot water inlet 23 for pouring a molten metal to be filtered. A hot water tub 24 is provided at the hot water inlet 23. The molten metal to be filtered is guided to the hot water tank 24 and flows into the can lower tank 21 through the hot water inlet 23. Furthermore, one of the four wall surface portions 21b is provided with a through hole (not shown) penetrating the wall surface portion 21b in the vicinity of the bottom surface portion 21a. This through hole is opened in the can lower tank 21. This through-hole is used for extracting the molten metal remaining in the can body 20 to the outside after completion of the filtration operation of the molten metal.

The upper surfaces of the four wall surfaces 21b in the can lower tank 21 are flush with each other, and the inner lid 22 is disposed on the upper surface. The shape of the inner lid 22 in a cross sectional view is substantially the same as the shape of the can lower tank 21 described above in a cross sectional view. However, as shown in FIG. 2, the inner wall 22 a of the inner lid 22 extends inward from the inner wall 21 b ′ of the can lower tank 21.

The inner lid 22 is provided with a hot water outlet 25 for pouring the filtered molten metal. A hot water outlet 26 is provided at the hot water outlet 25. The hot water outlet 25 is provided at a position facing the wall surface portion 21 b where the hot water inlet 23 is formed. However, the arrangement position of the hot water inlet 23 and the hot water outlet 25 is not limited to this. The molten metal filtered by the filtration unit 40 to be described later is discharged through the outlet 25, guided to the outlet 26 and guided to the next process.

The upper part of the can body part 20 having the inner lid 22 and the can lower part tank 21 is covered with an upper lid 30. As shown in FIGS. 2 and 3, the can body 20 and the upper lid 30 are liquid-tightly sealed with a packing 27 disposed on the upper surface of the inner lid 22. This sealing is achieved by the weight of the upper lid 30. The packing 27 is made of, for example, fibrous alumina.

A filtration unit 40 is disposed in the can body 20. The filtration unit 40 includes a plurality of filtration tubes 41 and a support plate 42. The support plate 42 is made of a ceramic that does not easily react with the molten metal. On the other hand, the filtration tube 41 is made of porous ceramics and has pores that allow the molten metal to flow and be filtered. The filtration tube 41 has a bottomed cylindrical shape having an opening 43 at one end 41a and the other end 41b being closed. In the filtration tube 41, the molten metal permeates from the outer peripheral surface side toward the inside, and the molten metal reaching the inside flows out from the opening 43. Although the shape of the cross section of the filtration tube 41 is generally annular, it is not limited to this.

The filtration tube 41 is formed of a refractory that is difficult to react with the molten metal. When the molten metal is made of, for example, aluminum or an aluminum alloy, the filter tube 41 can be made of silicon carbide ceramics, silicon nitride ceramics, alumina ceramics, zirconia ceramics, or the like. Preferably, the filtration tube 41 is made of alumina ceramics.

In the filtration unit 40, the support plate 42 is provided with a plurality of openings 44 penetrating in the thickness direction. In the filtration unit 40, each filtration tube 41 has one end portion 41a of the filtration tube 41, that is, the longitudinal direction of the filtration tube 41 is substantially orthogonal to the plate surface of the support plate 42, that is, At the end 41 a on the side having the opening 43, it is attached to the support plate 42. The position where each filter tube 41 is attached to the support plate 42 coincides with the position of the opening 44 provided in the support plate 42. Therefore, when the filtration unit 40 is viewed from the upper surface side of the support plate 42, the opening 44 provided in the support plate 42 communicates with the hollow portion of the filtration tube 41. As a means for attaching the filtration tube 41 to the support plate 42, for example, ceramic cement such as alumina cement may be used.

As shown in FIG. 2, the filtration unit 40 configured in this manner is placed in the can lower tank 21, which is a reservoir for molten metal, so that each filtration tube 41 hangs downward from the support plate 42. It is suspended. Therefore, each filtration tube 41 is arranged in the can body part 20 so that the longitudinal direction thereof faces the direction intersecting the horizontal plane. Specifically, each filtration tube 41 is disposed in the can 20 so that its longitudinal direction is substantially perpendicular to the horizontal plane, that is, substantially vertical, and the opening of each filtration tube 41 43 is opened upward in a substantially vertical direction. In this suspended state, the filtration unit 40 is arranged in the can lower tank 21 so that the plate surface of the support plate 42 substantially coincides with the horizontal plane. In the suspended state, the weight 45 is placed on the upper surface 47 a of the support plate 42 in the filtration unit 40. The weight 45 is placed on the support plate 42 at a position where the opening 44 is not formed. The weight 45 is used to prevent the filtration unit 40 from being lifted by buoyancy when starting the filtration of the molten metal.

Since the filtration unit 40 is in the suspended state as shown in FIG. 2, the molten metal can be filtered without applying an external force to the filtration tube 41 provided in the filtration unit 40. Moreover, even if the filtration tube 41 expands due to the heat of the molten metal, the increase in volume due to the expansion can be released in the longitudinal direction of the filtration tube 41, so that the thermal stress applied to the filtration tube 41 is minimized. be able to. By these actions, the filtration tube 41 is hardly damaged.

The suspension of the filtration unit 40 in the can body 20 is achieved as follows. That is, as shown in FIG. 3, in the filtration unit 40, each side surface 46 of the support plate 42 has a tapered surface inclined inward from the upper surface 47 a to the lower surface 47 b of the support plate 42. On the other hand, in the can body part 20, the inner wall surface 22 a of the inner lid 22, which is a part that suspends the filtration unit 40, has a tapered surface that is complementary to the tapered surface of the side surface 46 of the support plate 42. Therefore, when the filtration unit 40 is dropped into the can body portion 20 with the filtration tube 41 facing downward, the side surface 46 of the support plate 42 and the inner wall surface 22a of the inner lid 22 are in contact with each other. Therefore, further drop is regulated. As a result, the state in which the filtration unit 40 is suspended in the can body 20 is maintained. In order to stably maintain the suspended state of the filtration unit 40, it is advantageous that all the four side surfaces 46 of the support plate 42 are tapered surfaces, but instead, at least a pair of opposing side surfaces is used. Only 46 may be a tapered surface. Moreover, although the angle in the taper surface of each side surface 46 is the same, it may replace with this and may change an angle.

With the configuration as described above, the filtration unit 40 is in a suspended state, so that the filtration unit 40 and the can body portion 20 are separated by the weight of the filtration unit 40 and the weight 45 placed on the support plate 42. Sealed. Therefore, the filtration unit 40 can be sealed with the minimum necessary force, and even if the filtration unit 40 is not excessively sealed, it is difficult for the molten metal to leak. For the purpose of more surely sealing, the support plate 42 of the filtration unit 40 is pressed from the upper surface by using a pressing member (not shown) such as a rod-like body instead of or in addition to the weight 45. It may be. For the same purpose, for example, an alumina fiber packing (not shown) is provided between the contact surface between the side surface 46 of the support plate 42 having a tapered surface and the inner wall surface 22a of the inner lid 22 in the can body 20. ) May be inserted. Alternatively, instead of providing a tapered surface on the side surface 46 of the support plate 42, a step is provided on the side surface 46, and a step that fits with the step is provided on the inner wall surface 22 a of the inner lid 22 in the can body 20. It may be provided.

As shown in FIG. 2, a heater 50 is disposed between the lower end portion 41 b of the filtration tube 41 and the bottom portion of the can body portion 20. The heater 50 is horizontally placed at a position slightly apart from the bottom surface of the can body part 20 with its longitudinal direction substantially coincident with the horizontal plane. The heater 50 is used for the purpose of preheating the entire apparatus 10 before circulating the molten metal in the filtration apparatus 10. In the figure, a state in which a plurality of heaters 50 are used is shown, but the number of heaters 50 is not limited to this, and depending on the heat generation capacity of the heaters 50, the size of the filtering device 10, etc. Only one 50 may be used. The periphery of the heater 50 is covered with a heater cover 51, thereby preventing the heater 50 from being damaged by the molten metal. Since the heater 50 is disposed between the lower end portion 41 b of the filtration tube 41 and the bottom portion of the can body portion 20, these can be heated from a position close to the filtration tube 41 and the can body portion 20. It is advantageous in that the time can be shortened. In the known molten metal filtration device, for example, as shown in FIG. 5, the heater 150 is installed at a position away from the filtration tube 141, and thus it takes a long time for preheating. In the conventional filtration apparatus, since the filtration tube 141 is placed horizontally, a sufficient space cannot be ensured between the filtration tube 141 and the bottom of the can body part 121. For this reason, the filtration tube 141 and the can body can not be secured. The heater could not be installed between the bottom of the part 121.

The upper lid 30 that covers the can body portion 20 in which the filtration unit 40 is disposed is configured to reduce the capacity of the plate-like cover portion 31 that covers the entire can body portion 20 and the molten metal stored in the can body portion 20. And a closing portion 32 for closing the upper portion of the can body portion 20. The covering part 31 and the closing part 32 are formed integrally. However, both may be manufactured separately and then combined by a predetermined means.

The closing portion 32 is formed so that the bottom surface of the cover portion 31 having a plate shape bulges into a substantially inverted truncated cone shape, along the inner wall 22 a of the inner lid 22 in the can body portion 20. The bottom surface 32a of the blocking portion 32 is located on the upper surface 47a so as to be slightly separated from the upper surface 47a of the support plate 42 in the filtration unit 40. In the state in which the molten metal is being filtered, the bottom surface 32a of the closing part 32 and the molten metal surface of the molten metal stored in the can body part 20 are substantially at the same position.

The closed portion 32 is formed of a fixed or irregular refractory that is difficult to react with the molten metal. When the molten metal is made of, for example, aluminum or an aluminum alloy, the closing portion 32 can be made of a silicon nitride bonded silicon carbide refractory, a silicon nitride refractory, an alumina refractory, a zirconia refractory, or the like. In this case, you may coat | cover the outer surface of the obstruction | occlusion part 32 with metal casings.

By providing the closing part 32 in the upper lid 30, the capacity of the molten metal in the can body part 20 can be reduced, and the amount of remaining hot water can be reduced. Moreover, since the area where the molten metal surface contacts the oxygen in the atmosphere is reduced, the oxidation of the molten metal can be suppressed. As a result, the amount of the molten metal used for casting or the like can be increased, and at the same time, the amount of the metal oxide to be discarded can be suppressed, thereby improving the yield of the molten metal and saving resources. Moreover, it can also be prevented by the obstruction | occlusion part 32 that heat | fever is deprived in the upper part of the hot_water | molten_metal surface of a molten metal due to the convection of the atmosphere.

In filtration of molten metal using the filtration device 10 of the present embodiment, the heater 50 is first heated to preheat the can body 20 and the filtration tube 41 to a predetermined temperature. Next, as shown in FIG. 2, the molten metal to be filtered is guided to the hot water tank 24 and flows into the can lower tank 21 through the hot water inlet 23. The molten metal flowing into the can lower tank 21 penetrates from the outer peripheral surface side of the filtration tube 41 toward the inside. The molten metal that has reached the inside of the filtration tube 41 rises inside the filtration tube 41 and flows out of the filtration unit 40 through the opening 43 of the filtration tube 41 and the opening 44 of the support plate 42. Is done. The molten metal that has flowed out of the filtration unit 40 flows through a gap between the upper surface 47 a of the support plate 42 and the lower surface 32 a of the closing portion 32 of the upper lid 30, is discharged through the outlet 25, and is guided to the outlet 26. To the next process.

Next, a second embodiment of the filtration device of the present invention will be described with reference to FIG. The second embodiment will be described with respect to differences from the first embodiment described above, and the description detailed in the first embodiment will be applied as appropriate to points not specifically described. 4, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals.

4 is provided with a plurality of filtration tubes 41 in the filtration device 10 of the embodiment shown in FIG. Each filtration tube 41 is attached to a pair of

support plates

42 a and 42 b at both ends of the filtration tube 41. Each filtration tube 41 has a bottomed cylindrical shape having an opening (not shown) at one end 41a and the other end 41b being closed, as in the embodiment described above. In the filtration unit 40, one support plate 42a is provided with a plurality of openings (not shown) penetrating in the thickness direction. The position where each filter tube 41 is attached to the support plate 42a coincides with the position of an opening (not shown) provided in the support plate 42a. Therefore, when the filtration unit 40 is looked up from the lower surface side of the support plate 42a, an opening (not shown) provided in the support plate 42a communicates with a hollow portion of the filtration tube 41. Regarding the other support plate 42b, a plurality of recesses (not shown) are provided on the surface of the support plate 42b facing the support plate 42a. The other end 41b of the filter tube 41 is fitted in this recess. In this way, a plurality of filtration tubes 41 are fixed between the pair of support plates 42a and 4b.

As shown in FIG. 4, in the filtration unit 40, the filtration tube 41 is arranged so that the longitudinal direction thereof is substantially in the vertical direction. And the opening part (not shown) of each filtration tube 41 is opened toward the downward direction of the substantially perpendicular direction. The filtration unit 40 is mounted on the mounting portion 28 provided at the bottom of the can body portion 20 so that the support plate 42a is positioned below and the support plate 42b is positioned above the pair of

support plates

42a and 42b. It is mounted on. Therefore, the support plate 42 a is in contact with the placement portion 28. The placement portion 28 has an annular shape that is substantially the same shape as the contour of the support plate 42a when the can body portion 20 is looked down from above. Therefore, an opening (not shown) provided in the support plate 42 a is not closed by the placement unit 28. Since the mounting portion 28 is provided so as to protrude upward from the bottom portion of the can body portion 20, a space S is formed between the bottom portion of the can body portion 20 and the lower surface of the support plate 42a.

On the other hand, with respect to the support plate 42b located on the upper side in the filtration unit 40, the pressing member 60 is in contact with the substantially central region in plan view of the support plate 42b. The pressing member 60 is a rod-shaped member that extends in the vertical direction, and has a shape in which the cross section increases in diameter as it goes downward. The lower end surface of the pressing member 60 is flat, and the lower end surface comes into contact with the upper surface of the support plate 42b and presses the entire filtration unit 40 downward. When the molten metal is, for example, aluminum or an aluminum alloy, the pressing member 60 is preferably made of a material having high corrosion resistance against aluminum.

The pressing member 60 is inserted into a through-hole penetrating the upper lid 30 in the thickness direction at the portion of the upper lid 30 where the blocking portion 32 is provided. The upper portion 60a of the pressing member 60 is from the upper surface of the upper lid 30. Projects upward. The upper portion 60 a is provided with a flange portion 60 b at a position near the upper surface of the upper lid 30. Further, a spring 61 is attached to the upper portion 60a. The lower end portion of the spring 61 is in contact with the upper surface of the flange portion 60 b, and the upper end portion thereof is in contact with the spring pressing member 62. The spring pressing member 62 is fixed to the upper surface of the upper lid 30. By adopting such a structure, the pressing member 60 is urged downward by the action of the spring 61. As a result, the filtration unit 40 is pressed downward by the pressing member 60, and the space between the support plate 42 a and the placement portion 28 in the filtration unit 40 is sealed. Moreover, according to this structure, it is possible to always apply a constant pressing force to the filtration unit 40 without depending on the skill level of the operator's work. In addition, the pressing force can be easily adjusted by adjusting the force of the spring 61.

As shown in FIG. 4, in the filtration device 10 of the present embodiment, the lower end surface 32 a of the closing portion 32 in the upper lid 30 is located below the bottom surface of the hot water inlet 23.

In the filtration device 10, an air heating circulation device 70 such as a gas burner is disposed at a position away from the filtration device 10, for example, above the upper lid 30. A hot air supply pipe 71 extends from the air heating and circulation device 70. This supply pipe 71 is connected to the filtration device 10 in the vicinity of the tap 25 in the filtration device 10 so that hot air can be supplied into the filtration device 10. Further, a hot air recovery pipe 72 extends from the air heating and circulation device 70. The recovery pipe 72 is connected to the filtration device 10 in the vicinity of the hot water inlet 23 of the filtration device 10 so that hot air that has passed through the filtration device 10 can be recovered. When the air heating / circulation device 70 is operated, hot air heated to a predetermined temperature by the device is supplied into the filtration device 10 through the supply pipe 71. In FIG. 4, the distribution path of hot air is indicated by dotted arrows. The hot air supplied into the filtration device 10 rises from the lower part of the can body part 20 toward the upper part, flows through the filtration tube 41, and is then collected by the collection pipe 72 through the hot water inlet 23. The recovered hot air is heated again to a predetermined temperature by the air heating and circulation device 70 and then supplied into the filtration device 10 through the supply pipe 71. Thus, prior to filtering the molten metal, the hot air is circulated from the lower portion to the upper portion of the can body portion 20 to efficiently preheat the can body portion 20 and the filtration tube 41 of the filtration unit 40. Therefore, the preheating time can be shortened.

In addition to the air heating and circulation device 70, the filtration device 10 is provided with a heater 50. The heater 50 is used for maintaining the molten state of the molten metal during filtration of the molten metal. The heater 50 is installed at a position immediately below the upper lid 30 and adjacent to the closing portion 32 described above. The heater 50 is placed horizontally with its longitudinal direction substantially coinciding with the horizontal plane.

In the filtration of the molten metal using the filtration device 10 of the present embodiment, first, the air heating and circulation device 70 is operated to supply hot air into the can body portion 20, and the can body portion 20 and the filtration tube 41 are connected to a predetermined portion. Preheat to temperature. As described above, the hot air circulates from the lower part to the upper part of the can body part 20. Further, the heater 50 is heated. Next, as shown in FIG. 4, the molten metal to be filtered is guided to the hot water bath 24 and flows into the can body portion 20 through the hot water inlet 23. The molten metal that has flowed into the can body 20 penetrates from the outer peripheral surface side of the filtration tube 41 toward the inside. The molten metal that has reached the inside of the filtration tube 41 descends inside the filtration tube 41 and passes through an opening (not shown) of the filtration tube 41 and an opening (not shown) of the support plate 42a. It is filtered by flowing out to the outside. The molten metal that has flowed out of the filtration unit 40 is discharged through the hot water outlet 25 and is guided to the hot water tap 26 to be guided to the next process. During the filtration, the molten state of the molten metal is maintained by the heat generated by the heater 50.

Examples of the metal filtered by the filtration device 10 of each of the above embodiments include aluminum and aluminum alloys, but the filtration device of the present invention can also be used for filtration of other molten metal. it can.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in each of the embodiments described above, there are a plurality of filtration tubes 41 provided in the filtration unit 40, but a single filtration tube 41 may be used instead.

In each of the above embodiments, the longitudinal direction of the filtration tube 41 is substantially vertical. However, as long as the longitudinal direction intersects the horizontal plane, the longitudinal direction is substantially vertical. It doesn't need to be facing. For example, if the angle formed by the longitudinal direction of the filtration tube 41 and the horizontal plane is preferably 45 degrees or more, more preferably 55 degrees or more, and even more preferably 80 degrees or more, the effects of the present invention are sufficiently exerted.

In the first embodiment, the side surface 46 of the support plate 42 in the filtration unit 40 is a tapered surface, so that the filtration unit 40 is suspended in the can body portion 20, but other structures, for example, The filtration unit 40 may be suspended by employing the fitting structure as described above.

As a preheating mode, in the first embodiment, instead of using the heater 50, the hot air used in the second embodiment is used, and the filtration device 10 is arranged so that the hot air flows from the lower part to the upper part of the can body part 20. May be configured. Conversely, in the second embodiment, instead of heating with hot air, the heater 50 used in the first embodiment may be disposed between the filtration unit 40 and the bottom of the can body 20.

Furthermore, in the first embodiment, the lower end surface 32 a of the closing portion 32 in the upper lid 30 may be positioned below the bottom surface of the hot water inlet 23.

As described above in detail, according to the present invention, the filtration tube is less susceptible to stress when the filtration unit is sealed, and therefore the filtration tube is less likely to be damaged. Moreover, even if it does not seal a filtration unit excessively, it becomes difficult to leak the molten metal.

Claims

One or more porous ceramic filter tubes having an opening at one end and closed at the other end are used to store molten metal so that the longitudinal direction of the tube is in a direction intersecting the horizontal plane. Metal melt filtration device placed in the can body.
The molten metal filtration apparatus according to claim 1, wherein the filtration tube is disposed so that a longitudinal direction of the filtration tube faces a direction substantially orthogonal to a horizontal plane.
The filtration tube is attached to the support plate at at least one end of the filtration tube so that the longitudinal direction of the filtration tube is substantially orthogonal to the plate surface of the support plate, whereby the filtration unit Is formed,
The molten metal filtration apparatus according to claim 2, wherein the filtration unit is disposed in the can body so that a plate surface of the support plate substantially coincides with a horizontal plane.
In the filtration unit, the filtration tube is attached to the support plate at one end of the filtration tube,
The molten metal filter apparatus according to claim 3, wherein the filtration unit is suspended in the can body so that the filtration tube hangs downward from the support plate.
In the filtration unit, the side surface of the support plate is a tapered surface inclined inward from the upper surface to the lower surface of the support plate,
The molten metal filtration apparatus according to claim 4, wherein a portion of the can body portion that suspends the filtration unit includes a tapered surface that is complementary to a tapered surface of a side surface of the support plate.
In the filtration unit, the filtration tube is attached to the pair of support plates at both ends of the filtration tube,
The molten metal filtration according to claim 3, wherein the filtration unit is placed on the placement portion so that one of the support plates contacts a placement portion provided at the bottom of the can body portion. apparatus.
The molten metal filter device according to any one of claims 1 to 6, wherein a heater is disposed between a lower end portion of the filtration tube and a bottom portion of the can body portion.
The molten metal filter device according to any one of claims 1 to 6, wherein hot air is circulated from a lower portion to an upper portion of the can body portion.
The molten metal filtration apparatus according to any one of claims 1 to 8, further comprising a closing portion that closes an upper portion of the can body portion so as to reduce a capacity of the molten metal stored in the can body portion.
The molten metal filtration apparatus according to claim 9, wherein a lower end surface of the closed portion is positioned below a bottom surface of the hot water inlet.
The molten metal filtering apparatus according to claim 9 or 10, wherein the closing portion is formed integrally with an upper lid that covers the can body portion.