JP2011106689A - Melting furnace system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melting furnace system feasible at a low cost. <P>SOLUTION: This melting furnace system includes a melting furnace 102 storing molten aluminum 103, and a stirring device 101 opposed to a side wall and the bottom wall of the melting furnace, and includes first magnet bodies 11 and second magnet bodies 11 made of permanent magnets and disposed around the certain axis, and a driving mechanism rotating the first and second magnet bodies, and in which the first and second magnet bodies are respectively magnetized to have N-poles and S-poles on the outer peripheral face side and the inner peripheral face side, the first magnet bodies and the second magnet bodies are alternately disposed around the axis, and magnetic field intensities of the first magnetic bodies and second magnetic bodies are determined so that a magnetic line from the first or second magnetic bodies reaches the storage space through the side wall or the bottom wall, and a magnetic line from the storage space reaches the second or first magnetic bodies through the side wall or the bottom wall. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a melting furnace system.

  Conventionally, aluminum scrap or the like is melted, and aluminum is made into an ingot to produce a product. At this time, in order to make the quality of the ingot uniform, it is necessary to sufficiently stir the aluminum in the melting furnace. For this reason, a stirring rod is placed in the melting furnace, and the molten aluminum is artificially stirred, or an electrically driven stirring device is installed under the furnace bottom, and the molten aluminum is stirred by this device.

  Furthermore, as shown in Patent Document 1, there has been a case where a bypass (communication path) is provided in the melting furnace and the molten metal in the melting furnace is agitated by driving the molten metal in the bypass by electromagnetic force.

JP 2006-177612 A

  Since the thing of the conventional patent document 1 provides a bypass in a melting furnace, it is unavoidable that the manufacturing cost of a melting furnace increases. Although it is theoretically possible to provide a bypass in an existing melting furnace, it may be impossible in practice depending on factors such as cost and installation location.

  This invention is made | formed in view of such a point, The objective is to provide the melting furnace system realizable at low cost.

The melting furnace system of the present invention comprises:
A melting furnace for storing a molten aluminum formed in a container shape having a storage space by a side wall and a bottom wall;
An agitating device opposed to at least one of the side wall and the bottom wall of the melting furnace, wherein the at least one first magnet body is made of a permanent magnet and arranged on a circle around an axis. And at least one second magnet body, wherein the first and second magnet bodies are provided with a drive mechanism that rotates around the axis, and the first magnet body has an outer peripheral surface side and an inner peripheral surface. The second magnet body is magnetized so that the outer peripheral surface side and the inner peripheral surface side are the S pole and the N pole, respectively, and the first magnet is placed on the circle. The magnet bodies and the second magnet bodies are alternately arranged, and the magnetic field strengths of the first magnet body and the second magnet body are represented by the magnetic field lines from the first or second magnet body as the side wall or the bottom. The wall passes through the wall and reaches the storage space. Was set to something that leads to the second or the first magnet body through the side wall or the bottom wall, and a stirring device,
It is comprised as provided with.

  A melting furnace system that can be realized at low cost can be provided.

The top explanatory view of the whole composition of the aluminum melting furnace system by the present invention. The longitudinal section explanatory drawing of the whole structure of the aluminum melting furnace system by this invention. Longitudinal explanatory drawing which shows an example of the specific structure of the stirring apparatus main body. Plane explanatory drawing which shows arrangement | positioning of a magnet body. The perspective view which shows the structural example of a magnet body, the top view which shows the 1st, 2nd layer which comprises a magnet body, and a 3rd layer. The perspective view which shows the structural example of the basic magnet body shown for the comparison with embodiment of this invention, and the top view which shows the 1st-3rd layer which comprises a magnet body. The characteristic curve which shows the magnetic flux intensity obtained by the magnet body of embodiment of this invention by the comparison with that by a basic magnet body. The characteristic explanatory view showing distribution of the line of magnetic force obtained from the embodiment of the present invention. In FIG. 8, the characteristic curve which shows the magnitude | size of the electromagnetic force added to the molten metal in a melting furnace by the distance from a base point. In FIG. 8, the characteristic curve which shows the relationship between the distance from a base point (one point on the outer surface of the side wall of a melting furnace), and magnetic flux density. Plane explanatory drawing which shows the whole structure of the modification of the aluminum melting furnace system by this invention. Plane explanatory drawing which shows the whole structure of the further different modification of the aluminum melting furnace system by this invention. Longitudinal explanatory drawing which shows the whole structure of another modification of the aluminum melting furnace system by this invention. Plane explanatory drawing in the example of FIG. Longitudinal explanatory drawing which shows the whole structure of another modification of the aluminum melting furnace system by this invention. Longitudinal explanatory drawing which shows the whole structure of another modification of the aluminum melting furnace system by this invention.

  FIG.1 and FIG.2 is the plane explanatory drawing and longitudinal cross-sectional explanatory drawing of the whole structure of the melting furnace system 100 which concern on this invention. The melting furnace system 100 is configured to include a melting furnace 102 and a stirring device 101. In this embodiment, the stirring device 101 is provided in an upright state adjacent to the melting furnace 102, as can be seen particularly from FIG.

  As the melting furnace 102, a known one can be adopted. That is, the melting furnace 102 is configured as a molten metal 103 by melting the charged aluminum scrap by heating with various burners (not shown). Furthermore, what has already been installed as the melting furnace 102 regardless of the present invention can be used later as a part of the embodiment of the present invention. That is, the melting furnace system 100 of the present invention can be obtained by attaching the stirring device 101 to an existing melting furnace.

  As can be seen from FIG. 2 in particular, the stirring device 101 is provided outside one of the four side walls of the melting furnace 102.

  In FIG. 1, all the side walls of the melting furnace 102 are configured to have the same thickness Wt, but only the side wall facing the stirrer 101 can be configured to be thin as necessary. For example, only the side wall facing the stirrer 101 can be 25 mm, and the other side wall can be 50 mm.

The stirring device 101 includes an internal stirring device body 101A and a case 101B for housing it. As will be described later, the case 101B magnetically shields the outer three side surfaces.
That is, the case 101 </ b> B has first to fourth side portions 111 to 114, a bottom surface portion 115, and an upper surface portion 116 as can be seen from FIG. 1. The first side surface portion 111 facing the melting furnace main body 102 is made of a nonmagnetic material, and the other three second to fourth side surface portions 112 to 114, the bottom surface portion 115, and the upper surface portion 116 are made of a magnetic material or ferromagnetic material. It is composed of materials. Thereby, only one side surface of the stirring apparatus main body 101A is magnetically released, and the other three side surfaces are magnetically shielded. Therefore, as will be understood from the description below, the lines of magnetic force emitted from / returned to the stirrer main body 101A pass through only the first side surface portion 111 and are emitted / incident to / from the outside. Note that the first side surface portion 111 may be omitted, and the first side surface portion 111 may be configured in a released state.

  As this stirring apparatus main body 101A, the thing of various structures is employable. For example, the one shown in FIG. 3 can be used. The one shown in FIG. 3 is related to the prior invention and patent application of the inventor of the present invention (Japanese Patent Laid-Open No. 2006-177612). However, the magnet body 11 of the stirring apparatus main body 101A has a configuration shown in FIGS. 3A to 3C described later, and is unique to the present invention. Further, in the drawing, the ratio of dimensions of each part is slightly changed visually.

  The stirrer main body 101A schematically includes a plurality of magnet bodies 11, 11,... Arranged around a substantially vertical axis, and the magnet bodies 11 are rotated about the axis. It is. As a result, the magnetic lines of force (magnetic field) coming out of the magnet body 11 and passing through the molten aluminum 103 are rotated. As a result, the lines of magnetic force move in the molten aluminum 103, and electromagnetic force is generated. By this electromagnetic force, the molten metal 103 is forced to flow counterclockwise along the arrow A in FIG. In addition, although heat generate | occur | produces in that case, it is comprised as what has a mechanism which air-cools the heat.

  In FIG. 1, the magnet body 11 whose outside is the north pole is called a first magnet body 11A, and the magnet body 11 whose outside is a south pole is called a second magnet body 11B.

  More specifically, the stirring apparatus main body 101A is configured as follows.

  That is, in FIG. 3, the outer cylinder 1 as a case made of a nonmagnetic member such as stainless steel is provided with an upper lid 2. A rotating magnet body 4 is pivotally supported in the outer cylinder 1 so as to be rotatable about a substantially vertical axis L. That is, the lower bearing 5 is attached inside the bottom surface of the outer cylinder 1. An upper bearing 6 is attached to the outer surface of the upper lid 2. On the other hand, the rotating magnet body 4 pivotally supported by these bearings 5 and 6 has an upper end plate 8 as an upper support plate and a lower end plate 9 as a lower support plate, which are separated from each other in the vertical direction. Four permanent magnet bodies 11, 11,... Are fixed. The magnet body 11 will be described in detail later, but is configured as a combination of a plurality of magnets in a unique manner.

  The number of these magnet bodies 11 is not limited to 4, and can be any other plural number, for example, 6 or the like.

  As can be seen from FIG. 4 as an explanatory diagram with the upper end plate 8 removed, these magnet bodies 11, 11,... Each magnet body 11 is magnetized so that the inside and outside are N and S magnetic poles. These magnet bodies 11, 11,... Are arranged so that the polarities are reversed every 90 °. As a result, the magnetic field lines ML run as shown in FIG. That is, a certain magnetic field line ML is included in a certain horizontal plane, but in the installation state of FIG. 1, it is injected along a horizontal plane from a certain magnet body 11, penetrates the molten metal in the horizontal melting furnace 102, and then Incident light returns to the magnet body 11 along a horizontal plane.

  That is, referring to FIG. 2, a certain magnetic field line ML from a certain magnet body 11 comes out horizontally from the magnet body 11, passes through the furnace wall of the melting furnace 102, runs through the molten metal 103, and then again. It is configured to pass through the furnace wall and finally return to the magnet body 11.

  Furthermore, an upper hollow shaft 13 and a lower hollow shaft 14 as upper and lower rotating shafts for rotating the upper and lower end plates 8 and 9 are fixed in a penetrating state. That is, the upper hollow shaft 13 passes through the opening 2 b for blowing air of the upper lid 2. These upper and lower hollow shafts 13 and 14 are rotatably supported by the upper and lower bearings 6 and 5.

  A drive motor 15 for rotating the rotating magnet body 4 is fixed on the upper lid 2. A driving side sprocket 16 is attached to the driving shaft 15 a of the motor 15, and a driven side sprocket 17 is attached to the upper hollow shaft 13. A power transmission chain 18 is wound between the pair of sprockets 15 and 16. Thereby, the rotating magnet body 4 is rotated by the driving force of the driving motor 15.

  Further, a blower 19 is mounted on the upper lid 2. The discharge port 19 a of the blower 19 is fixed to the upper hollow shaft 13 through a coupling 22 in a communicating state. The coupling 22 supports the rotating hollow shaft 13 on the lower side in the figure and the stationary discharge port 19a of the upper blower 19 in the figure in a communicating state. As a result, the wind from the blower 19 passes between the magnet bodies 11, 11,... Sideways, and flows downward through the ventilation holes 9 a, 9 a,. Furthermore, these winds change the flow upward and are discharged to the outside air from the exhaust holes 2a, 2a,... And the exhaust tubes 20, 20,. In such a flow process, heat generated in the outer cylinder 1 is cooled based on electromagnetic force (eddy current). In addition, the outer cylinder 1 can also be comprised with a heat resistant resin. In this case, self-heating due to Joule heat is not performed, but cooling by the blower 19 effectively acts on cooling of radiant heat from the molten metal or the like.

  The agitator main body 101A does not necessarily have the same structure as the above-described structure. However, it is necessary to make the rotating magnet body 4 rotatable at a minimum.

  The relationship between the height of the stirrer main body 101A having such a configuration and the depth of the melting furnace 102 will be described as follows.

  FIG. 2 shows the relationship between the height of the stirring apparatus main body 101A, in particular, the height H1 of the magnet body 11, and the depth D1 of the molten metal 103 in the melting furnace 102. That is, it can be considered from the energy efficiency that the height H1 of the magnet body 11 and the depth D1 of the molten metal 103 in the melting furnace 102 are substantially equal. FIG. 2 is a diagram schematically showing only the main part of the stirring apparatus main body 101A so that the main part can be seen.

  Next, the configuration of the magnet body 11 used in the stirring apparatus main body 101A of FIG. 1 will be described with reference to FIGS. 5 (a) to 5 (c). As shown in FIG. 2, the magnet body 11 shown in FIG. 5 is shown in a state where the magnet body 11 that has been used upright is tilted sideways.

  As can be seen from FIG. 5A, the magnet body 11 has a dimension of vertical l, horizontal w, and height t. As can be seen from FIG. 5, the magnet body 11 is configured to have a plurality of layers in the thickness direction. In FIG. 5A, the first to third three magnet body layers ly1, ly2, and ly3 are provided. The first to third magnet body layers ly1, ly2, and ly3 are each of two types of a plurality of first unit magnets 11a, second unit magnets 11b, and third unit magnets 11c as permanent magnets. It is configured as being arranged along an XY plane along a rule.

  That is, the first to third unit magnets 11a, 11b, and 11c have the same thickness, the upper surface is magnetized to the N pole, and the lower surface is magnetized to the S pole. However, their lengths or widths are different as can be seen from FIGS. 5 (b) and 5 (c). That is, suppose that the 1st unit magnet 11a is a basic magnet. The second unit magnet 11b is obtained by halving the length of the first unit magnet 11a, and the third unit magnet 11c is obtained by halving the width of the first unit magnet 11a. In other respects, the three first to third unit magnets 11a, 11b, and 11c are configured as substantially the same magnets.

  A plan view of the first and third magnet body layers ly1 and ly3 composed of the first unit magnet 11a and the second unit magnet 11b among the first to third unit magnets 11a, 11b, and 11c. Is shown in FIG. 5 (b), and a plan view of the second magnet body layer ly2 is shown in FIG. 5 (c).

  The first magnet body layer ly1 (and the third magnet body layer ly3) shown in FIG. 5 (b) has four first unit magnets 11a located at the center in the length direction and both ends in the length direction. Four second unit magnets 11b are provided.

  In addition, the second magnet body layer ly2 shown in FIG. 5C includes three first unit magnets 11a that are arranged vertically in the center in the width direction, and six third units that are located on both sides in the width direction. And a unit magnet 11c.

  Such first to third unit magnets 11a, 11b, and 11c are adjacent to each other in the XY direction, between the first unit magnets 11a, between the second unit magnets 11b, Between the three unit magnets 11c, between the first unit magnet 11a and the second unit magnet 11b, and between the first unit magnet 11a and the third unit magnet 11c, repulsive magnetic forces due to the same poles act. Is inevitable. That is, between adjacent unit magnets of the first to third unit magnets 11a, 11b, and 11c, N poles face each other on the upper surface side, and S poles face each other on the lower surface side. Because. From this, as can be seen from FIGS. 5A to 5C, logically, it is inevitable that the gap G exists between the unit magnets adjacent in any direction of XY. Although this gap G depends on the size of each unit magnet, it is, for example, 1-2 mm.

  Thus, the magnet body 11 includes the first magnet body layer (first type magnet body layer) ly1, the second magnet body layer (second type magnet body layer) ly2, and the third magnet body. The layers (first type magnet body layers) ly3 are configured to be sequentially stacked in the thickness direction. However, as can be seen by overlapping the two layers ly1 (ly3) and ly2 shown in FIGS. 5B and 5C in particular, the first and second layers ly1 are arranged such that the phase of the gap G is aligned vertically. , Ly2, and the second and third layers ly2, ly3 are shifted from each other, and the gaps G of the three layers ly1, ly2, ly3 do not overlap in a state where the phases are aligned vertically. Since the gaps G in the upper and lower layers ly1, ly2, and ly3 are not overlapped in a vertically aligned state, the unit magnets in these three layers ly1, ly2, and ly3 are strongly magnetically attracted up and down, and one unit An integral magnet body 11 is formed. That is, in particular, as can be seen from FIG. 5A, one unit magnet in one of the two layers of the upper and lower three layers ly1, ly2, and ly3 is replaced with a plurality of unit magnets in the other layer. Direct contact with each other. This is true for all the unit magnets in the two overlapping layers. As a result, all the unit magnets that overlap in the vertical direction are strongly attracted to each other and integrated as one magnet body 11.

  More specifically, for example, the overlap between the first layer ly1 and the second layer ly2 will be described. The first unit magnet 11a (11) of the first layer ly1 in FIG. 5B is similar to the third unit magnets 11c (21) and 11c (22) of the second layer ly2 in FIG. 5C. The unit magnets 11a (21) and 11a (22) b are directly superposed and magnetically attracted to the four unit magnets. The same applies to other unit magnets. Therefore, the unit magnets of the three layers ly1, ly2, and ly3 are strongly attracted to each other, and the arrangement state is strongly maintained and integrated.

  Thus, when only one of the layers ly1, ly2, and ly3 is viewed, the unit magnets arranged in the vertical and horizontal directions are magnetically repelled and try to separate. That is, the gap G is generated and an attempt is made to enlarge it. However, as described above, the unit magnets in the upper and lower layers ly1, ly2, and ly3 strongly attract each other directly. For this reason, when the three layers ly1, ly2, and ly3 are viewed as a single unit, all unit magnets in each layer overcome the repulsive force that tends to separate from each other and are firmly integrated.

  Thereby, as described above, the strong three-piece magnet body 11 is configured by the three layers ly1, ly2, and ly3.

  In addition, the structure of the 1st-3rd type magnet body layer 11A-11c shown to Fig.5 (a)-(c) can also be seen as follows.

  Each of the first type magnet body layers ly1 and ly3 and the second type magnet body layer ly2 includes a plurality of unit magnets 11a to 11c each having a certain value in the XYZ directions.

  The first type magnet body layers ly1 and ly3 are regarded as four quadrants around the first coordinate center when the center CT1 on the XY plane of the first type magnet body layers ly1 and ly3 is regarded as the first coordinate center. Four unit magnets 11a are arranged one by one, and a plurality of other unit magnets 11b are further arranged adjacent to each of the four unit magnets 11a in the XY direction. By configuring.

  The second type magnet body layer ly2 is regarded as having a center CT2 on the XY plane of the second type magnet body layer ly2 as a second coordinate center, and one unit magnet 11a ( 21) is arranged such that the centers thereof overlap, and the unit magnets 11a and 11c are arranged adjacent to the unit magnet 11a (21) in the XY direction. .

  Since the magnet body 11 is configured as described above, a strong magnetic field can be generated.

  This will be described in comparison with the basic magnet body 21 shown in FIGS. 6 (a) and 6 (b) used previously by the present inventor.

  First, the basic magnet body 21 for comparison will be described. As can be seen from FIG. 6B, the basic magnet body 21 includes a plurality of unit magnets 11a as only one of the three types of unit magnets 11a, 11b, and 11c shown in FIG. 5B. It is what was used. That is, the layers ly10, ly20, and ly30 are configured as six unit magnets 11a, 11a,... Arranged in the XY direction. In each layer ly10, ly20, ly30, a gap G0 similar to that described above exists between these unit magnets 11a, 11a,. Thus, the basic magnet body 21 is configured by stacking these layers ly10, ly20, ly30 as shown in FIG.

  In the basic magnet body 21, the phases of the gaps G0 of the layers ly10, ly20, and ly30 are aligned. For example, consider the lowest first layer ly10 and the second layer ly20 above it. The unit magnet 11a (11) having the first layer ly10 overlaps only with the unit magnet 11a (21) of the second layer ly20, and is attracted to each other by magnetic force. However, a unit magnet 11a (11) in the first layer ly10 overlaps with the unit magnet 11a (21) in the second layer ly20, but does not overlap with any other unit magnet 11a in the second layer ly20. . Therefore, as can be seen from FIG. 6 (a), the three unit magnets 11a, 11a,. They only repel each other magnetically and do not attract each other. For this reason, in the basic magnet body 21 in FIG. 6A, the gap G0 tends to further widen and cannot function as an integral magnet. In other words, the gap G0 lowers the permeance (operating point) as a magnet and prevents the magnetic flux from flying far. That is, the basic magnet body 21 cannot be an integral magnet, and a strong magnetic field cannot be generated from now on.

  On the other hand, in the magnet body 11 of FIGS. 5A to 5C, it is inevitable that the gap G exists between the unit magnets 11a, 11b, and 11c in each of the layers ly1, ly2, and ly3. However, as described above, the unit magnets 11a, 11b, and 11c in the layers ly1, ly2, and ly3 are in direct contact with the unit magnets 11a, 11b, and 11c that are out of phase in the stacked layers, and are magnetically coupled to each other. They are sucked together and integrated. As a result, it functions as if it were an integrated magnet with no gap G, that is, a magnet that can provide high permeance (operating point) equivalent to that of an integrated magnet from the beginning. As a result, the magnetic lines of force can be blown farther from the magnet body 11 shown in FIGS. 5 (a) to 5 (c). That is, as can be seen from FIG. 1, it is possible to obtain a magnetic field having a strength that sufficiently penetrates the furnace wall having the wall thickness Wt of the melting furnace 102.

  FIG. 7 is a characteristic diagram showing a result of an experiment conducted by the inventor for examining the effect of the magnet body 11 of FIG. In this experiment, the characteristics of both the magnet body 11 in FIG. 5 and the basic magnet body 21 in FIG. 6 were adopted. This characteristic diagram shows that a stirrer 101 using a magnet body 11 and a stirrer (not shown) using a basic magnet body 21 are actually installed as shown in FIG. 1 and FIG. This is a measurement of the reach distance of the magnetic flux. The magnetic flux distribution curve MFD1 is obtained when the magnet body 11 shown in FIG. 5 is used, and the magnetic flux distribution curve MFD2 is obtained when the magnet body 21 shown in FIG. 6 is used.

  It can be seen from the magnetic flux distribution curve MFD1 in FIG. 7 that when the magnet body 11 in FIG. 5 is used, the magnetic flux distribution having the strength and distance necessary for stirring the molten metal 103 in the melting furnace 102 can be obtained. As described above, Wt at the bottom of the magnetic flux distribution curves MFD1 and D2 in FIG. 7 indicates a portion that does not contribute to stirring, corresponding to the wall thickness of the furnace wall of the melting furnace 102. Therefore, portions L 0 and L 1 in each magnetic flux distribution curve are used as a force for stirring the molten metal 103 in the melting furnace 102.

  As can be seen from the magnetic flux distribution curves MFD1 and MFD2 in FIG. 7, it was found that the magnetic body 11 in FIG. 5 can obtain a magnetic field much larger than that of the basic magnet body 21 in FIG. The reason is analyzed from the above. That is, in the magnet body 11, all the unit magnets 11a, 11b, 11c are integrated together, whereas in the basic magnet body 21, the unit magnets 11a, 11a,. It is considered that the composite unit magnets 211 repel each other but do not attract each other.

  FIG. 8 is an explanatory view showing a main part of FIG. FIG. 8 shows one moment of the rotating stirring device main body 101A. At this moment, the magnetic flux MF is represented as shown. In the figure, Le indicates the farthest distance from the surface of the magnet body 11 where the magnetic flux MF reaches. FIG. 10 is a graph showing the relationship between the distance L from the outer surface of the melting furnace 102 (substantially equal to the distance from the surface of the magnet body 11) and the magnetic flux density Φ at that point. Thus, in FIG. 8, when the stirrer main body 101A is rotated, as shown in FIG. 9, according to the distance from the inner wall surface IS of the melting furnace 102, the velocity curve is obtained from the relationship with the magnetic flux density of FIG. At a speed indicated by Fm & V, the molten metal 103 in the melting furnace 102 is stirred as indicated by an arrow A in FIG.

  FIG. 11 is a modification of the melting furnace system 100 of FIG. FIG. 11 shows an example in which two stirring devices 101 are used. The stirring device 101 can employ any number of 3 or more. Further, the plurality of stirring devices 101 can be installed at arbitrary positions around the melting furnace 102.

  FIG. 12 is a modification of the melting furnace system 100 of FIG. In FIG. 12, a cylindrical furnace is used as the melting furnace 102.

  FIG. 13 shows an example in which the stirrer 101 is provided below the bottom of the melting furnace 102. FIG. 14 is an explanatory plan view of FIG. In other words, for example, a hole H is dug in the ground to be installed, the stirring device 101 is installed in a sideways state in this hole H1, and the melting furnace 102 is installed thereon. By the rotation of the stirrer main body 101A in the stirrer 101, the molten metal 103 is driven to rotate in the direction indicated by the arrow around the horizontal axis as shown in FIG.

  FIG. 15 shows an example in which the stirring device 101 is installed laterally outside the melting furnace 102.

  FIG. 16 shows an example in which a second stirring device 101 is further added to the system of FIG.

In the melting furnace system 100, when the stirrer main body 101A of the stirrer 101 rotates, the magnetic force lines ML move along a certain horizontal plane in the molten aluminum 103 in the melting furnace main body 102, as can be seen from FIG. . Due to the electromagnetic force generated thereby, the molten metal 103 in the melting furnace 102 is circulated and stirred as shown by an arrow A in FIG.
Thus, in the stirring device 101, as shown in FIG. 3, the wind from the blower 19 is forcibly sent into the interior. Thereby, the Joule heat generated in the outer cylinder 1 due to the eddy current with the rotation of the magnet bodies 11, 11,... Is cooled by the wind from the blower 19.

  Furthermore, in the above-described embodiment, an example is shown in which the rotating magnet body 4 is fixed in a state in which the magnet bodies 11, 11... Of the four permanent magnets are erected between the upper and lower end plates 8, 9. Obviously, the structure is not limited to this. That is, any magnet structure may be used as long as the magnetic field lines are generated as shown in FIG.

  According to the embodiment of the present invention described above, the following advantages can be obtained.

  That is, according to the embodiment of the present invention, it is not necessary to provide a communication path, so that the initial cost can be suppressed. And since it does not have a communicating path, a melting furnace can be comprised as a structurally solid thing, there is no possibility that the leak of a molten metal etc. may arise, and it can be excellent also in terms of safety. Furthermore, the maintenance of the communication path is naturally unnecessary, and the running cost can be suppressed.

DESCRIPTION OF SYMBOLS 100 Melting furnace system 101 Stirring apparatus 101A Stirring apparatus main body 101B Case 102 Melting furnace 103 Molten metal 11A 1st magnet body 11B 2nd magnet body 11a, 11b, 11c Unit magnet G, G0 Space | gap ly1-ly3 Magnet body layer ly1, ly3 first type magnet body layer ly2 second type magnet body layer

Claims (12)

A melting furnace for storing a molten aluminum formed in a container shape having a storage space by a side wall and a bottom wall;
A stirring device that is opposed to at least one of the side wall and the bottom wall of the melting furnace, at least one first magnet body and at least one made of permanent magnets arranged around an axis. Two second magnet bodies, and a drive mechanism that rotationally drives the first and second magnet bodies around the axis, wherein the first magnet body has N outer peripheral surfaces and inner peripheral surfaces respectively. The second magnet body is magnetized so that the outer peripheral surface side and the inner peripheral surface side are the S pole and the N pole, respectively, and the first magnet body and the second magnet body The magnet bodies are alternately arranged around the axis, and the magnetic field strengths of the first magnet body and the second magnet body are changed, and the magnetic lines of force from the first or second magnet body pass through the side wall or the bottom wall. Penetrates to the storage space, and the magnetic field lines from the storage space Was set to something that leads to the second or the first magnet body through the side wall or the bottom wall, and a stirring device,
A melting furnace system comprising:   Each of the first and second magnet bodies includes at least one first-type magnet body layer having one surface magnetized as an N pole and the other surface magnetized as an S pole, and the other surface magnetized as an N pole. 2. The melting furnace system according to claim 1, wherein the melting furnace system is configured by laminating at least one second-type magnet body layer whose side is magnetized to an S pole.   Each of the first-type magnet body layer and the second-type magnet body layer has a plurality of unit magnets in which one surface is magnetized as an N pole and the other surface is magnetized as an S pole in a matrix along a certain surface. It is configured as an array, and both the first type magnet body layer and the second type magnet body layer are accompanied by repulsion between the same poles acting between the unit magnets adjacent to each other along the certain surface. The first type magnet body layer and the second type magnet body layer include a gap, and the gap of the first type magnet body layer and the gap of the second type magnet body layer overlap each other. The melting furnace system according to claim 2, wherein the layers are laminated so that the phases are shifted so as not to exist.   The unit magnets in one of the first type magnet body layer and the second type magnet body layer directly and simultaneously overlap with the plurality of unit magnets in the other, and attract each other by magnetic force. The melting furnace system according to claim 3, wherein the magnet body or the second magnet body is configured. Each of the first type magnet body layer and the second type magnet body layer includes a plurality of unit magnets each taking a certain value in the XYZ directions,
The first type magnet body layer is regarded as the first coordinate center when the center of the first type magnet body layer in the XY plane is considered as one quadrant around the first coordinate center. Arranging the two unit magnets, and further arranging the plurality of unit magnets so as to be continuously adjacent to each of the four unit magnets in the XY direction,
The center of the second type magnet body layer in the XY plane of the second type magnet body layer is regarded as the second coordinate center, and one unit magnet overlaps the center of the second coordinate center. And arranged by arranging the plurality of unit magnets so as to be continuously adjacent to the one unit magnet in the XY direction.
The melting furnace system according to any one of claims 2 to 4, wherein the melting furnace system is provided.   As the unit magnet, a first unit magnet having a size in the XYZ direction, a second unit magnet having a half size in the X direction of the first unit magnet, and a third unit magnet having a half size in the Y direction are used. The melting furnace system according to claim 5, wherein   The stirrer includes a case for storing the stirrer in a magnetic shield state, and at least a surface of the case facing the melting furnace is configured as a non-shielded surface. The melting furnace system as described in one of thru | or 6.   The melting furnace system according to claim 1, wherein the stirring device is provided in a standing state on a side wall of the melting furnace.   The melting furnace system according to claim 8, wherein a plurality of the stirring devices are provided around a side wall of the melting furnace.   The melting furnace system according to any one of claims 1 to 7, wherein the stirring device is provided in a recumbent state so as to face the outside lower side of the bottom wall of the melting furnace.   The melting furnace system according to claim 10, further comprising a stirring device provided in a recumbent state so as to face a side wall having the melting furnace.   The melting furnace system according to claim 1, wherein the stirring device includes a cooling mechanism.

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