CN111051544B - Molten metal filtering device - Google Patents

Abstract

A molten metal filtration device (100) is provided with: a can body (10) having an opening (10 a); a lid body (20) that covers the opening (10 a) of the can body (10); a filter (30) disposed in the tank (10) and filtering the molten metal; and a pressing unit (40) which is provided with a pressing member (41) that can move relative to the lid (20) and presses the filter (30) toward the can (10), and is provided on the lid (20).

Description

Molten metal filtering device

Technical Field

The present invention relates to a molten metal filtration apparatus.

Background

There is known a filtering apparatus for filtering molten metal such as aluminum to remove inclusions and the like contained in the molten metal. As shown in patent document 1, for example, this filter device includes a filter body (assembly 5) and a tank (tank body 1) including a first melting chamber on the upstream side and a second melting chamber on the downstream side partitioned by the filter body. The filter is placed on a receiving portion (receiving base 4) of the can body so as to surround the flow path of the molten metal after filtration.

In such a filter device, since the filter body is not fixed to the receiving portion of the tank body, there is a fear that the filter body becomes unstable due to buoyancy by the molten metal, and a gap is generated between the filter body and the receiving portion of the tank body, and the molten metal leaks. In this case, repair of the filtering apparatus and various devices disposed downstream thereof will take a lot of time and cost. Therefore, it is important to reliably maintain the sealed state between the filter body and the receiving portion of the can body.

In view of this fact, patent document 2 proposes that the sealing property between the filter body (filter unit 40) and the receiving portion (middle cap 22) of the tank body (tank body portion 20) be improved by placing a weight (45) on the filter body (filter unit 40). The filter device of patent document 2 is superior to the filter device described in patent document 1 in terms of the sealing state between the filter body and the receiving portion of the can body, but there is room for improvement in order to more reliably prevent leakage of the molten metal.

Further, patent document 3 proposes fixing a filter to a can body (can body portion 20) by a wedge (70). However, in order to achieve sufficient sealing performance, it is necessary to drive the wedges into the plurality of recesses (39) so that pressure acts between the filter and the receiving portion of the can body, but in the fixing method in which the wedges are driven, it is difficult to fix the filter at a uniform pressure every time the filter is fixed, and therefore, in the filter device of patent document 3, there remains a problem that the sealing performance cannot be stably improved.

Documents of the prior art

Patent document

Patent document 1 Japanese patent laid-open No. Sho 63-147509

Patent document 2 Japanese patent No. 5669718

Patent document 3 Japanese patent No. 6177442

The present invention has been made in view of the above circumstances, and an object thereof is to provide a molten metal filtering apparatus that can easily improve the sealing property between a filter and a receiving portion of a can body.

Disclosure of Invention

The molten metal filtration device of the present invention comprises:

a can having an opening;

a lid body covering the opening of the can body;

the filtering body is arranged in the tank body and used for filtering molten metal; and

and a pressing unit provided on the lid body and having a pressing member that is movable relative to the lid body and presses the filter body toward the tank body.

According to the present invention, since the filter is pressed toward the can body by the pressing means, it is possible to provide a molten metal filtering apparatus capable of easily achieving high sealing between the filter and the can body.

Drawings

FIG. 1 is a schematic plan view showing a molten metal filtering apparatus according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is an enlarged view of a region III surrounded by a two-dot chain line of fig. 2.

Fig. 4 is a sectional view taken along line IV-IV of fig. 2.

Fig. 5 is a sectional view taken along line V-V of fig. 1.

Fig. 6 is a sectional view taken along line VI-VI of fig. 1.

Fig. 7 is a schematic sectional view showing a molten metal filtration apparatus according to a modification of fig. 1.

Fig. 8 is a schematic sectional view showing a molten metal filtering apparatus according to still another modification of fig. 1.

Detailed Description

Hereinafter, a molten metal filtering apparatus 100 according to an embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a schematic plan view showing a molten metal filtration apparatus 100 according to an embodiment of the present invention, and fig. 2 is a sectional view taken along line II-II of fig. 1. Fig. 3 is an enlarged view of a region III surrounded by a one-dot chain line of fig. 2. Fig. 4 is a sectional view taken along line IV-IV of fig. 2, fig. 5 is a sectional view taken along line V-V of fig. 1, and fig. 6 is a sectional view taken along line VI-VI of fig. 1. In the present specification, the following description will be given by specifying an XYZ three-dimensional coordinate system in which the right direction in fig. 1 is the positive X-axis direction, the upper direction in fig. 1 is the positive Y-axis direction, and the near direction in fig. 1 is the positive Z-axis direction. In the present embodiment, the XY plane is defined in parallel with the horizontal plane at a position including a contact region between the filter 30 and the can body 10, which will be described later. The Z-axis is an axis parallel to the vertical direction and is defined at a position passing through the center of gravity of the filter 30. In the present embodiment, the positive Z-axis direction is an upward direction, and the negative Z-axis direction is a downward direction.

As shown in fig. 1 to 2 and 4 to 6, the molten metal filtration apparatus 100 includes a can body 10 having an opening 10a, a lid body 20 covering the opening 10a of the can body 10, a filter body 30 provided in the can body 10, and a pressing means 40 provided in the lid body 20. The pressing unit 40 has a pressing member 41 that is relatively movable with respect to the lid body 20. The pressing member 41 moves relative to the lid 20 to press the filter 30 toward the can body 10. As shown in fig. 2, the pot 10 has a first melting chamber 11 and a second melting chamber 12 partitioned by a filter 30. The molten metal flows from the first melting chamber 11 via the filter 30 to the second melting chamber 12. At this time, the filter 30 filters the molten metal.

As shown in fig. 1 to 2 and 4 to 6, the vessel body 10 has a substantially rectangular parallelepiped shape, and a liquid inlet 14 for introducing the molten metal to be filtered into the first melting chamber 11 and a liquid outlet 15 for discharging the filtered molten metal from the second melting chamber 12 are provided on a side surface parallel to the YZ plane and having a positive X coordinate. The vessel 10 has a first flow path 14a for guiding the filtered molten metal from the inlet 14 to the first melting chamber 11, and a second flow path 15a for guiding the filtered molten metal from the second melting chamber to the outlet 15.

The lid 20 has a substantially rectangular parallelepiped shape, and has a through hole 20a through which the Z axis passes in a state of covering the opening 10a of the can 10. As shown in fig. 1 and 2, the pressing unit 40 is provided on the lid 20 at a position where the through hole 20a is formed. The pressing member 41 of the pressing unit 40 extends from the outside of the lid 20 through the through hole 20a into the first melting chamber 11 of the can body 10 along the Z axis.

As shown in fig. 2 to 6, the filter body 30 includes a support plate 31 and a plurality of tubular filter elements 32 supported by the support plate 31 from the periphery. The support plate 31 is made of ceramic, which is hard to react with the molten metal. The filter element 32 is made of porous ceramic and has pores through which molten metal can flow and be filtered. The outer edge region of the support plate 31 is provided with a flange 31f surrounding the periphery of the filter element 32.

As shown in fig. 2, 3, and the like, the can body 10 has a receiving portion 13 that receives the filter 30. Therefore, when the filter body 30 is pressed by the pressing member 41 of the pressing unit 40, the flange portion 31f presses the receiving portion 13 of the can body 10. As shown in fig. 3, a gasket (Packing) 50 is preferably disposed between the filter body 30 and the receiving portion 13 of the can body 10, and the flange portion 31f of the filter body 30 and the receiving portion 13 of the can body 10 are preferably sealed in a liquid-tight manner. The gasket 50 is preferably made of, for example, fibrous alumina or the like.

An opening 12a that becomes an inlet of the second melting chamber 12 is formed in the tank 10, and the filter 30 is disposed so as to cover the opening 12a. In the example shown in fig. 4, the opening 12a has a regular octagonal shape when viewed from the Z-axis direction, and its peripheral edge is defined by the receiving portion 13 of the can body 10. The flange portion 31f of the filter body 30 also has a regular octagonal contour in accordance with the shape of the receiving portion 13. The outline is a figure of a similar shape in which the regular octagonal shape of the opening 12a defined by the receiving portion 13 is slightly enlarged, and the center thereof coincides with the origin O. The opening 12a and the filter 30 are not limited to the regular octagon shape, and may be circular, square, hexagonal, or the like.

The plurality of filter elements 32 included in the filter body 30 have a bottomed cylindrical shape having one end portion serving as a closed end 32c and the other end portion serving as an open end 32f. In the illustrated example, the axial direction of the filter element 32 having a cylindrical shape is parallel to the Z-axis. Here, the axial direction of the filter element 32 means a direction parallel to a straight line connecting both ends of the filter element 32. As shown in fig. 2, all of the filter elements 32 are arranged with the closed end 32c at the upper side and the open end 32f at the lower side. The vicinity of the open end 32f of each filter element 32 is supported by the support plate 31 located on the XY plane. Of course, the support plate 31 has an opening at a position corresponding to the filter element 32 so as not to close the open end 32f of the filter element 32 in a state of supporting the filter element 32. Since the filter element 32 is disposed above the support plate 31 in this manner, the receiving portion 13 of the present embodiment is configured to surround the flow path of the molten metal filtered by the filter element 32.

The support plate 31 is made of a uniform material and has a uniform thickness. As shown in fig. 4, the filter 30 of the present embodiment includes 22 filter elements 32, and is arranged symmetrically about the X axis and the Y axis. The individual filter elements 32 have the same construction as one another. As described above, the center of gravity of the filter 30 having such a symmetrical structure coincides with the origin O when viewed from the Z-axis direction.

Next, the pressing unit 40 will be described with reference to fig. 2 and 5. Here, the lid 20 is in a state of covering the opening 10a of the can body 10. The pressing unit 40 includes the pressing member 41 and an axial force generating mechanism 42 including a pressing force control mechanism described later and generating an axial force that presses the pressing member 41 in the axial direction (Z-axis direction). The pressing member 41 of the present embodiment has a rod-shaped body 41r extending in the vertical direction, and the center axis thereof coincides with the Z axis. The upper end of the pressing member 41 is connected to the axial force generating mechanism 42, and extends through the through hole 20a of the lid 20 toward the lower end to hang from the outside of the can body 10 into the first melting chamber 11.

The pressing member 41 of the present embodiment has a contact portion at a lower end thereof for dispersing the pressing force. As shown in fig. 2 and 5, the contact portion 41p is configured as a circular plate-like member extending in parallel with the XY plane. The contact portion 41p is fixed to the lower end of the rod 41r by a suitable fixing tool such as a bolt so that the center position thereof coincides with the center axis of the rod 41r. Therefore, the axial force generated by the axial force generating mechanism 42 acts on the filter 30 at the position of the origin O when viewed from the Z-axis direction via the rod-shaped body portion 41r and the contact portion 41 p. In other words, the filter 30 is pressed by the pressing unit 40 at a position that is the center of gravity when viewed in the Z-axis direction. Here, it is preferable to provide a spacer (not shown) between the contact portion 41p and the filter body 30 in order to uniformly apply the pressing force from the contact portion 41p to the upper surface of the filter body 30.

The axial force generating mechanism 42 includes a cylindrical case 43 fixed to the upper surface of the lid body 20 and standing vertically upward, an axial force generating portion 44 supported by the upper portion of the case 43, and a pressing force control mechanism disposed below the axial force generating portion 44 and controlling the pressing force of the pressing member 41 against the filter body 30. In the present embodiment, the coil spring 45 is used as the pressing force control mechanism. However, the pressing force control mechanism is not particularly limited as long as it has a function of applying a necessary pressing force to fix the filter 30. Therefore, as the pressing force control means, for example, a hydraulic cylinder, an air cylinder, or the like may be used, although it will be described in detail later. The coil spring 45 used in the present embodiment is disposed as an example of the pressing force control means, and is suitable in that it has a simple configuration to perform a function of applying a pressing force necessary for fixing the filter 30 and a function of preventing an excessive force from acting on the filter 30.

The axial force generating portion 44 has a bolt (not shown) that is relatively moved in the vertical direction with respect to the housing 43 by rotation of the handle 46. A coil spring 45 is disposed between the lower end of the bolt and the upper end of the pressing member 41. In this configuration, the screw of the axial force generating portion 44 is displaced vertically downward to compress the coil spring 45. Then, the elastic force from the compressed coil spring 45 acts on the pressing member 41. That is, the axial force generated by the axial force generating portion 44 is transmitted to the pressing member 41 via the coil spring 45.

Next, the operation of the molten metal filtering apparatus 100 according to the present embodiment will be described. Here, as an initial state of the molten metal filtration apparatus 100, a state is assumed in which the filter 30 is disposed at an appropriate position in the can body 10, but the opening 10a of the can body 10 is not covered with the lid body 20.

First, before the molten metal is filtered, the handle 46 of the pressing unit 40 is rotated as necessary to reduce the amount of downward feeding of the pressing member 41 with respect to the lid body 20. This prevents the pressing member 41 from accidentally coming into contact with the filter 30 and damaging the filter 30 when the opening 10a of the can body 10 is covered with the lid 20. Then, in this state, the lid 20 is conveyed to above the opening 10a of the can body 10 by a conveying device such as a crane, and is positioned with respect to the can body 10. Then, the lid 20 is lowered, and the opening 10a of the can body 10 is covered with the lid 20.

Next, the handle 46 of the pressing unit 40 is rotated to lower the bolt in the Z-axis negative direction. With this lowering, the distance separating the contact portion 41p from the filter body 30 gradually decreases, and then the contact portion 41p comes into contact with the filter body 30. When the handle 46 is further rotated from this state to lower the bolt, the pressing member 41 is not allowed to further lower, and therefore the coil spring 45 is compressed to generate an elastic force between the bolt and the pressing member 41. The elastic force is the pressing force of the pressing unit 40. Therefore, the pressing force of the pressing unit 40 is substantially evaluated and managed by the amount of compression of the coil spring 45 on the basis that the spring constant of the coil spring 45 is known. Therefore, when the compression amount of the coil spring 45 reaches a predetermined value, it is considered that the desired pressing force is achieved, and the rotation operation of the handle 46 is stopped. Of course, a detection device such as a load sensor for detecting the pressing force may be disposed in the pressing unit 40, and the rotation operation of the handle 46 may be stopped when the detection result of the detection device reaches a desired value.

The pressing force of the pressing means 40 is applied to the plurality of filter elements 32 in a dispersed manner due to the presence of the contact portion 41 p. By this pressing force, the flange portion 31f of the filter 30 presses the receiving portion 13 of the can body 10 via the gasket 50. The force acting between the flange portion 31f and the receiving portion 13 is a resultant force of the gravity acting on the filter body 30 and the pressing force of the pressing unit 40. The pressing force of the pressing member 41 acts on the position of the center of gravity of the filter 30 when viewed from the Z-axis direction. As a result, the gasket 50 disposed between the flange portion 31f and the receiving portion 13 is uniformly pressed with a sufficient force, and thus the sealing property between the filter body 30 and the receiving portion 13 is sufficiently improved. Thereby, preparation for filtering the molten metal is completed.

Next, the molten metal to be filtered is poured into the inlet 14. The poured molten metal flows into the first melting chamber 11 from the inlet 14 through the first flow path 14 a. The molten metal flowing into the first melting chamber 11 passes through the filter element 32 of the filter 30 having a cylindrical shape with a bottom while being filtered from the outside toward the inside. The filtered molten metal flows into the second melting chamber 12 from the open end 32f below the filter element 32 through the opening 12a.

When the amount of the molten metal retained in the first melting chamber 11 increases, buoyancy acts on the filter 30 due to the molten metal, and the force acting between the flange portion 31f of the filter 30 and the receiving portion 13 of the can body 10 decreases. However, in the present embodiment, the filter 30 is pressed toward the can body 10 by the pressing unit 40, and thus the sealing state between the filter 30 and the receiving portion 13 is stably maintained.

When the molten metal flows into the first melting chamber 11, the filter 30 is heated by the molten metal, and the filter element 32 is increased in size in the Z-axis direction by thermal expansion. Thereby, the pressing member 41 is pressed upward via the contact portion 41p, and the coil spring 45 is compressed. At this time, since the upper limit value of the pressing force is controlled by the predetermined spring constant of the coil spring 45, even if the filter element 32 is thermally expanded, the pressing force of the pressing means 40 against the filter body 30 is substantially maintained without being excessively increased, and the binding rupture of the filter element 32 can be suppressed.

Then, as the amount of the filtered molten metal retained in the second melting chamber 12 increases, the liquid level of the molten metal gradually rises and then reaches the liquid outlet 15 through the second flow path 15a. The molten metal discharged from the liquid outlet 15 is supplied to a subsequent apparatus by an appropriate mechanism.

According to the present embodiment as described above, since the filter 30 is pressed toward the can body 10 by the pressing means 40, the molten metal filtering apparatus 100 which can easily improve the sealing property between the filter 30 and the can body 10 can be provided.

The can body 10 has a receiving portion 13 for receiving the filter 30, and the filter 30 has a peripheral flange portion 31f for abutting against the receiving portion 13. The receiving section 13 surrounds the flow path of the molten metal filtered by the filter element 32. With this configuration, the filter 30 can be stably pressed against the can body 10 while appropriately ensuring a flow path of the filtered molten metal.

Further, since the gasket 50 is disposed between the filter 30 and the receiving portion 13 of the can body 10, the sealing property between the filter 30 and the receiving portion 13 can be improved, and leakage of the molten metal can be prevented.

The can body 10 of the present embodiment includes a first melting chamber 11 and a second melting chamber 12 partitioned by a filter 30, and the molten metal flows from the first melting chamber 11 to the second melting chamber 12 through the filter 30. Therefore, both the molten metal to be filtered and the filtered molten metal can be retained in the can body 10, and the molten metal can be continuously filtered stably.

Since the pressing member 41 of the pressing unit 40 presses the filter 30 in the first melting chamber 11, even if buoyancy by the molten metal acts on the filter 30, a pressing force necessary for sealing the filter 30 and the can body 10 can be sufficiently provided, and thus reliable sealing performance can be ensured.

An opening 12a that becomes an inlet of the second melting chamber 12 is formed in the pot 10, and the filter 30 is disposed so as to cover the opening 12a. Therefore, the filtered molten metal can be smoothly guided to the second melting chamber 12.

The lid 20 has a through hole 20a, and the pressing member 41 of the pressing unit 40 has a rod-shaped body portion 41r that penetrates the through hole 20a of the lid 20. Therefore, the pressing member 41 can be easily operated from the outside in a state where the opening 10a of the can body 10 is covered with the lid body 20. Further, since the pressing unit 40 is not particularly complicated when it is provided on the lid body 20, the lid body 20 does not need to be thickened, and the pressing unit 40 can be easily attached and detached.

The pressing means 40 has a coil spring 45 as a pressing force control mechanism for controlling the pressing force of the pressing member 41 against the filter 30, and presses the pressing member 41 toward the can body 10 via the coil spring 45. Therefore, the function of applying a pressing force necessary for fixing the filter body 30 and the function of preventing an excessive force from acting on the filter body 30 can be appropriately provided by a simple configuration, and therefore, even if the filter body 30 thermally expands and repeats cooling contraction as the operation and stop of the filter apparatus 100, the filter body 30 can be prevented from being bound and broken by an excessive load due to pressing, and the pressing force can be applied to the filter body 30 within a certain range, and therefore, the sealing property between the filter body 30 and the receiving portion 13 can be sufficiently maintained.

Further, since the pressing member 41 has the contact portion 41p at a portion facing the filter body 30, the pressing force of the pressing member 41 is distributed over a certain area to act on the filter body 30, and thus the filter body 30 can be more reliably prevented from being damaged by the pressing member 41. This ensures long-term reliability of the filter 30.

The filter body 30 includes a bottomed cylindrical filter element 32 extending in the Z-axis direction and having a closed end 32c at an upper end and an open end 32f at a lower end. Therefore, the area of the orthographic projection image obtained by projecting the filter 30 from the Z-axis direction onto the XY plane can be reduced as compared with a filter in which the filter elements 32 are arranged to extend in the horizontal direction. Therefore, the molten metal filtering apparatus 100 can be provided even in a narrow installation space.

Next, a modification of the above embodiment will be described with reference to fig. 7. Fig. 7 is a schematic cross-sectional view of the molten metal filtering apparatus 200 according to the modification of fig. 1, showing a cross-section at the same position as the V-V line cross-sectional view (fig. 5) of fig. 1.

As shown in fig. 7, the molten metal filtration apparatus 200 includes a fixture 260 for fixing the lid 20 and the can 210. In order to enable fixation by the fixture 260, the can 210 is provided with a pair of locking protrusions 215 on the outer surfaces of two wall portions parallel to the XZ plane. The locking projection 215 is a projection projecting outward from each wall, and may be fixed to the wall of the can body 210 by an appropriate fixing member, or may be integrally formed with the wall.

As shown in fig. 7, the fixture 260 includes an upper locking portion 261 locked to the upper surface of the lid body 20, a lower locking portion 262 locked to the lower surface of the locking convex portion 215, and a connecting portion 264 connecting the upper locking portion 261 and the lower locking portion 262. The connecting portion 264 is illustrated as being parallel to the Z axis in fig. 7, but is not limited to this shape, and may have a curved portion, for example. Further, a screw hole is formed in the lower locking portion 262 so as to penetrate in the Z-axis direction, and a bolt 263 is screwed into the screw hole. The distance separating the upper locking portion 261 from the lower locking portion 262 excluding the bolt 263 is slightly larger than the distance from the upper surface of the cover 20 to the lower surface of the locking convex portion 215. On the other hand, the bolt 263 can screw the lower locking portion 262 until the distance between the tip end thereof and the upper locking portion 261 becomes smaller than the distance from the upper surface of the cover body 20 to the lower surface of the locking convex portion 215. Since other configurations are the same as those of the above-described embodiment shown in fig. 1 to 2 and 4 to 6, the same reference numerals are given to the same components as those in fig. 1 to 2 and 4 to 6 in fig. 7, and detailed description thereof will be omitted.

Next, the operation of the molten metal filtering apparatus 200 according to this modification will be described. First, before filtering the molten metal, the opening 10a of the can body 210 is covered with the lid body 20 in the same manner as in the above embodiment. Then, the lid 20 is fixed to the can 210 using the pair of fixtures 260 as follows. That is, each bolt 263 is loosened as necessary so that the distance between the tip end (upper end in fig. 7) of the bolt and the upper locking portion 261 becomes larger than the distance from the upper surface of the cover body 20 to the lower surface of the locking convex portion 215. Then, the pair of fixtures 260 are assembled to the lid 20 and the can 210 so that the locking projections 215 of the lid 20 and the can 210 are sandwiched by the fixtures 260. In this state, each bolt 263 is screwed into the lower locking portion 262 and moves forward in the Z-axis direction. This screwing is continued until the tip of the bolt 263 abuts against the lower surface of the locking convex portion 215 of the can body 210, and the bolt 263 is tightened with a predetermined torque. In order to stably fix the lid 20 to the can 210, it is preferable that the torques of the fastening bolts 263 are the same in both the fixing tools 260.

Then, as in the above embodiment, the filter 30 is pressed against the can 210 by the pressing means 40. At this time, even when a pressing force exceeding the weight force acting on the lid body 20 acts on the filter body 30, since the lid body 20 is fixed to the can body 210, it is possible to prevent the lid body 20 from undesirably floating from the can body 210 due to a reaction of the pressing force. Thereafter, the molten metal is filtered. The filtration step is the same as in the above embodiment, and therefore, a detailed description thereof will be omitted.

According to the molten metal filtration apparatus 200 of the present modification, since the lid body 20 is fixed to the can body 210 by the fixing tool 260, the lid body 20 can be prevented from being lifted from the can body 210 by the reaction of the pressing force of the pressing member 41. Therefore, even when the filter 30 needs to be pressed more strongly against the can body 210 by the pressing member 41, stable pressing can be performed. In addition, the molten metal filter device 200 can also perform the same functions and effects as the molten metal filter device 100 of the embodiment shown in fig. 1 to 2 and 4 to 6.

Various modifications of the fixture 260 described above are considered. For example, instead of the locking projection 215 of the can 210, a recess may be provided in the wall of the can 210, and the lower locking portion 262 of the fixture 260 may be locked in the recess. In this case, the upper locking portion 261 is provided with a bolt 263 and a thread groove into which the bolt is screwed. Alternatively, the lid 20 and the can body 10 may be directly fixed by bolts.

Next, fig. 8 is a schematic cross-sectional view showing a molten metal filtering apparatus 101 according to still another modification of fig. 1. As shown in fig. 8, the orientation of the filter 30 of the molten metal filter device 101 is vertically reversed from the embodiment shown in fig. 1 to 2 and 4 to 6. That is, in the present modification, the filter element 30 is disposed in the can body 10 in such a direction that the open end 32f of the filter element 32 is located above and the closed end 32c is located below. Therefore, in the present modification, the molten metal passes through the filter element 32 having a cylindrical shape with a bottom while being filtered from the inside to the outside. Therefore, the receiving portion 13 of the can body 10 is configured to surround the flow path of the molten metal to be filtered. The pressing member 41 of the pressing unit 40 of the present modification presses the filter element 30 against the receiving portion 13 of the can body 10 from the open end 32f side of the filter element 32 in the first melting chamber 11. Therefore, although not shown, a through hole through which the molten metal can pass is formed in the contact portion 41p at a position corresponding to the open portion so as not to close the open portion of the open end 32f. The other structure is substantially the same as the embodiment shown in fig. 1 to 2 and 4 to 6. Therefore, in fig. 8, the same reference numerals are given to components corresponding to the embodiments shown in fig. 1 to 2 and 4 to 6, and detailed description thereof will be omitted.

In this case, the area of the orthographic projection image obtained by projecting the filter from the Z-axis direction onto the XY plane can be reduced as compared with the filter in which the filter elements 32 are arranged in the horizontal direction, and therefore the molten metal filter apparatus 101 that can be installed in a narrower installation space can be provided. Otherwise, according to the molten metal filtering apparatus 101 of the present modification, substantially the same operation and effect as those of the molten metal filtering apparatus 100 of the embodiment shown in fig. 1 to 2 and 4 to 6 can be achieved. Of course, in the modification shown in fig. 7, the filter 30 may be reversed in the vertical direction. In this case, the same operation and effect as those of the modification shown in fig. 7 can be achieved.

In the above embodiment and the modifications, the single pressing means 40 is provided in the lid body 20, but the present invention is not limited to this example. That is, in another embodiment, a plurality of pressing units 40 may be provided in the cover 20. In this case, the number of the pressing units 40 may be set so that the through holes 20a through which the pressing member 41 can pass are formed in the cover body 20, and the pressing units 40 may be provided in the through holes 20a. Each of the pressing units 40 may be the same as the pressing unit 40 employed in the embodiment shown in fig. 1 to 2 and 4 to 6. According to this configuration, since the load acting on the filter element 32 of the filter body 30 can be further dispersed, the risk of damage to the filter element 32 due to the pressing force of the pressing means 40 can be further reduced.

Further, it is preferable that the plurality of pressing units 40 are arranged symmetrically with respect to the origin O when viewed from the Z-axis direction. According to this arrangement, the pressing forces of the plurality of pressing units 40 act symmetrically with respect to the center of gravity (origin O) of the filter body 30, and therefore the force with which the flange portion 31f of the filter body 30 presses the receiving portion 13 of the can body 10 is made uniform. As a result, the force acting on the gasket 50 is also made uniform, and the flange portion 31f and the receiving portion 13 can be sealed with a uniform force.

In the above description, the example in which the coil spring 45 is used as the pressing force control means is described, but as described above, a hydraulic cylinder, an air cylinder, or the like may be used instead of the coil spring 45. In this case, the pressing force of the pressing member 41 against the filter 30 can be maintained constant by maintaining the hydraulic pressure or the air pressure at a predetermined value. Instead of generating the axial force using the handle 46 and the bolt, the axial force may be generated by a hydraulic cylinder, an air cylinder, or the like. In this case, the hydraulic cylinder, the air cylinder, and the like share the function of an axial force generation mechanism that generates an axial force and the function of a pressing force control mechanism that controls the pressing force with which the pressing member 41 presses the filter 30. In these cases, since the function of applying a pressing force necessary for fixing the filter element 30 and the function of preventing an excessive force from acting on the filter element 30 can be appropriately provided, the bound rupture due to the thermal expansion of the filter element 32 can be suppressed.

In the above description, the axial direction of the filter element 32 is aligned parallel to the Z axis. However, the present invention is not limited to the above example, and the filter element 32 may be disposed so that the axial direction thereof intersects the Z axis at an acute angle, that is, the axial direction intersects the horizontal plane. In this case, compared with a filter in which the filter elements 32 are arranged in the horizontal direction, the area of the orthographic projection image obtained by projecting the filter from above onto the horizontal plane can be reduced, and therefore, a molten metal filter device that can be installed in a narrower installation space can be provided.

Claims (10)

1. A molten metal filtration device is characterized by comprising:

a can body having an opening;

a lid body covering the opening of the can body;

the filtering body is arranged in the tank body and used for filtering the molten metal; and

a pressing unit provided on the lid body and having a pressing member that is movable relative to the lid body and presses the filter body toward the tank body,

the pressing unit has the pressing member and an axial force generating mechanism including a pressing force control mechanism and generating an axial force of the pressing member,

the axial force generating mechanism includes a cylindrical case fixed to an upper surface of the lid body and standing vertically upward, an axial force generating portion supported by an upper portion of the case, and the pressing force control mechanism arranged below the axial force generating portion and controlling a pressing force of the pressing member against the filter body,

the axial force generating portion has a bolt that moves relative to the housing in a vertical direction by rotation of a handle, the pressing force control mechanism is disposed between a lower end of the bolt and an upper end of the pressing member,

the tank body is provided with a bearing part for bearing the filter body,

the filter body includes a peripheral flange portion that contacts the receiving portion, and a filter element that extends in a vertical direction, i.e., a Z-axis direction, and is supported from the periphery by the flange portion,

the receiving section surrounds a flow path of the molten metal filtered by the filter element or surrounds a flow path of the molten metal to be filtered by the filter element,

a gasket is disposed between the flange portion of the filter body and the receiving portion of the can,

the pressing member of the pressing unit presses the filter body so that the filter body presses the receiving portion of the can body via the gasket,

the molten metal filtering device further comprises a fixing device for fixing the cover body and the tank body,

the fixing device comprises an upper locking portion locked on the upper surface of the cover body, a lower locking portion locked on the lower surface of a locking convex portion arranged on the outer surface of two wall portions of the tank body parallel to the vertical direction, and a connecting portion connecting the upper locking portion and the lower locking portion, wherein a screw hole is formed in the lower locking portion in a penetrating manner along the vertical direction, a bolt is screwed into the screw hole, the bolt is screwed into the lower locking portion until the distance between the front end portion of the bolt and the upper locking portion is smaller than the distance from the upper surface of the cover body to the lower surface of the locking convex portion,

the pressing force control mechanism is a coil spring.

2. A molten metal filtering device as set forth in claim 1,

the tank body comprises a first melting chamber and a second melting chamber which are divided by the filter body,

the molten metal flows from the first melting chamber to the second melting chamber through the filter body.

3. A molten metal filtering device as set forth in claim 2,

the pressing member of the pressing unit presses the filter body in the first melting chamber.

4. A molten metal filtering device as set forth in claim 2 or 3,

an opening which becomes an inlet of the second melting chamber is formed in the pot body,

the filter body is disposed so as to cover the opening.

5. A molten metal filtering device as set forth in any one of claims 1 to 3,

the cover body is provided with a through hole,

the pressing member of the pressing unit has a rod-shaped body portion penetrating the through hole of the lid body.

6. A molten metal filtering device as set forth in any one of claims 1 to 3,

the pressing means presses the pressing member toward the can body via the pressing force control mechanism.

7. A molten metal filtering device as set forth in any one of claims 1 to 3,

the pressing member has a contact portion at a portion facing the filter body.

8. A molten metal filtering device as set forth in claim 7,

the contact portion is a plate-like member.

9. A molten metal filtering device as set forth in any one of claims 1 to 3,

the filter body includes a bottomed cylindrical filter element having one closed end and the other open end,

the axial direction of the cylindrical filter element intersects the horizontal plane.

10. A molten metal filtering device as defined in claim 9,

the one end of the filter element is located above the other end.

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