JP2009002643A - Melting furnace with stirrer, and stirrer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melting furnace with stirrer that positively melts a charged raw material in the melting furnace, and the stirrer. <P>SOLUTION: The melting furnace with the stirrer is equipped with a main body of the melting furnace 25 for melting the raw material, and the stirrer installed below a bottom surface of the main body of the melting furnace 25 for stirring molten metal 30 in the main body of the melting furnace 25 by applying a moving magnetic field to the molten metal 30. The stirrer is composed of a frame 2 as a base placed on the floor, a supporting base 6 for magnets whose one end side is mounted rotatably around a first shaft (hinge 4) substantially horizontal with respect to the frame 2 and the other end thereby capable of being tilted and turned with the first shaft as the center, a rotary plate 17 rotatably journaled to the supporting base 6 around a second shaft positioned substantially perpendicular to the supporting base 6 when the supporting base 6 is at a substantially horizontal position and which changes its angle accompanying the tilting and turning of the supporting base 6, and a plurality of magnets 22 fixed on the rotary plate 17. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a melting furnace with a stirrer and a stirrer.

Conventionally, for example, an aluminum melting furnace with a stirrer of melting furnaces for melting aluminum to be recycled is a mechanical type in which a rotating body is inserted into the furnace and directly stirred, and the molten metal is sucked up by a negative pressure pump In addition, there are a pressure-reducing type that stirs and a three-phase alternating current is passed through the fixed magnetic pole to generate a moving magnetic field, and an electromagnetic type that stirs with an electromagnetic force based on the magnetic field.

The above-mentioned mechanical device is a device in which the rotating body is directly agitated in high-temperature hot water, so that it cannot be said that the durability of the device is sufficient, and the operability and maintenance are complicated and complicated. There is. The vacuum type has poor operability and has not been widely used. Furthermore, the electromagnetic type requires a large current, consumes a large amount of power, has a high running cost, requires careful attention to the cooling of the coil, and the entire device must be expensive. There are problems and these are preventing the spread.

The present invention has been made in view of such a current situation, and an object thereof is a melting furnace and an agitation apparatus that can dissolve the input raw material reliably, which is inexpensive, has good operability, and has a low running cost. Is to provide.

The present invention
A melting furnace body for melting raw materials into molten metal,
A stirrer installed below the bottom of the bottom surface of the melting furnace body, and stirring the molten metal in the melting furnace body by applying a magnetic field to move it,
With
The stirring device
A frame as a table placed on the floor;
For the magnet, one end side is attached to the frame so as to be rotatable around a substantially horizontal first axis, and the other end side is capable of rotating up and down around the first axis. A support base;
The support base is pivotally supported so as to be rotatable around a second axis that takes a substantially vertical position when the support base is in a substantially horizontal position, and the second axis is the undulation of the support base. A rotating plate that changes angle with movement,
A plurality of magnets fixed on the rotating plate, and the magnets return to another magnet after a magnetic field line from one of them passes through the molten metal in the melting furnace body. When the support base is in a state of rising from a horizontal position in association with the rotation of the rotating plate in this state, the molten metal in the melting furnace body is placed on the surface of the molten metal. A plurality of magnets that can be driven to rotate along a rotating plate while being inclined with respect to a horizontal plane;
Characterized by comprising,
It is provided as a melting furnace with a stirrer.

Furthermore, the present invention provides
A stirrer installed below the melting furnace body, stirring the molten metal in the melting furnace body configured to melt the raw material by applying an alternating magnetic field thereto,
The stirring device
A frame as a table placed on the floor;
For the magnet, one end side is attached to the frame so as to be rotatable around a substantially horizontal first axis, and the other end side is capable of rotating up and down around the first axis. A support base;
The support base is pivotally supported so as to be rotatable around a second axis that takes a substantially vertical position when the support base is in a substantially horizontal position, and the second axis is the undulation of the support base. A rotating plate that changes angle with movement,
A plurality of magnets fixed on the rotating plate, and the magnets return to another magnet after a magnetic field line from one of them passes through the molten metal in the melting furnace body. When the support base is in a state of rising from a horizontal position in association with the rotation of the rotating plate in this state, the molten metal in the melting furnace body is placed on the surface of the molten metal. A plurality of magnets that can be driven to rotate along a rotating plate while being inclined with respect to a horizontal plane;
Characterized by comprising,
Provided as a stirring device.

  Thus, according to the present invention, the molten metal in the melting furnace can be efficiently rotated, and the raw material to be charged can be reliably melted.

  FIG. 1A shows a non-use state of the embodiment of the present invention, and FIG. 1B and 1C are enlarged views of a part of FIG. 1A, and FIG. 1B is a plan view of a part of the apparatus of FIG. FIG. 4 is a view of a part seen from the same direction as (a). In FIG. 1A, a frame 2 is set on the floor 1. A magnetic field generator 3 is mounted on the frame 2 so as to be able to swing up and down around a hinge 4, that is, around a substantially horizontal axis perpendicular to the paper surface. That is, the magnetic field generator 3 has a hollow housing (support) 6, and this housing 6 has a substantially horizontal axis with the hinge 4 as the center, as can be seen from FIGS. 1 (a) and 2. It is mounted on the frame 2 so that it can be swung up and down. In practice, the left side of the housing 6 in FIG. 1 is lifted away from the support 2 </ b> A of the frame 2, and then lowered, so that it undulates about the substantially horizontal axis (first axis) of the hinge 4. Operation is performed. Various mechanisms can be employed as a mechanism for performing this operation. In the illustrated embodiment, a screw mechanism is employed. Of course, a gear mechanism can also be employed. That is, in FIG. 1A, the driving rod 9 is pivotally supported around its axis (substantially vertical second axis) by the support portion 8 fixed to the frame 2. In particular, as can be seen from FIG. 1 (c), a handle 9 </ b> A for rotational driving is fixed at a substantially central portion in the longitudinal direction of the driving rod 9. A screw is cut on the upper side of the drive rod 9 to form a so-called male screw portion 9B. A substantially spherical female screw body 9C is screwed into the male screw portion 9B. The female screw body 9C moves up and down by the rotation of the male screw portion 9B. In particular, as can be seen from FIG. 2B, driven members 10 and 10 fixed to the housing 6 are pivotally supported by the female screw body 9C by lateral shafts 9D and 9D so as to be capable of mutual rotation. Further, as can be seen from FIG. 1 (c), the driven members 10, 10 have slits 10A, 10A cut in the longitudinal direction so that they can slide with respect to the shafts 9D, 9D. . Accordingly, when the driving rod 9 is rotated by the handle 9A, the female screw body 9C moves up and down, and the driven members 10 and 10 rotate around the shafts 9D and 9D and the shafts 9D and 9D. The driven members 10 and 10 move so that 9D slides in the slits 10A and 10A, and the magnetic field generator 3 is lifted as shown in FIG. 2, for example. That is, the housing 6 rotates up and down around the hinge 4. Here, if the amount of rotation of the handle 9A is adjusted, the amount of undulation of the housing 6 can be controlled. In addition, the mechanism for raising / lowering the housing | casing 6 is not restricted to the above-mentioned thing.

  A magnetic field generator (stirrer) 12 is provided in the casing 6. That is, the magnetic field generator (stirring device) 12 has a mounting seat 13 fixed to the inner bottom surface of the housing 6, and a drive motor 14 having a continuously variable rotational speed is mounted on the mounting seat 13. The shaft of the drive motor 14 is connected to a shaft 17 </ b> A of a magnet base (rotary plate) 17 through a coupling 15. The shaft 17 </ b> A is supported by a bearing 20 positioned at the center portion of the stay 19 whose both ends are fixed inside the housing 6. Further, as can be seen from FIGS. 3A and 3B in particular, rod-shaped permanent magnets 22, 22,... Are fixed on the magnet base 17. Each permanent magnet 22 has a magnetic pole on both upper and lower sides. Further, these permanent magnets 22, 22,... Are arranged such that adjacent magnetic poles are different from each other. These two adjacent permanent magnets constitute a magnet pair, and here, two magnet pairs are provided. The permanent magnets 22, 22,... Can be arranged with four magnet pairs as shown in FIG. 4. With such a configuration, the rotation of the drive motor 14 is transmitted to the magnet pair, that is, the permanent magnets 22, 22... Via the coupling 15 and the magnet base 17.

  A melting furnace (melting furnace body) 25 made of a non-magnetic material is fixed above the casing 6 (magnetic field generating unit 3) by a mechanism (not shown). The bottom 25A of the melting furnace 25 is inclined by an angle θ as can be seen from FIG. As can be seen from FIG. 2, when the housing 6 (magnetic field generating unit 3) is lifted around the hinge 4, it makes contact with the upper surface of the housing 6 without any gap so as to use the magnetic field lines as much as possible. It is to do.

  1 and 2 are used, the housing 6 (magnetic field generator 3) is lifted around the hinge 4 from the state of FIG. 1 to the state of FIG. In the state of FIG. 2, the magnetic lines of force from the permanent magnets 22, 22... Run in the molten metal 30 such as aluminum as shown in FIG.

  In the state of FIG. 2, initially, aluminum in the melting furnace 25 is melted with a burner or the like (not shown) to obtain a molten metal 30. When the motor 14 rotates the permanent magnets 22, 22,... While putting aluminum scrap into the molten metal in this state, the lines of magnetic force from these move through the molten metal 30. That is, an alternating magnetic field is applied to the molten metal 30. As a result, an eddy current is generated, and the molten metal 30 starts to rotate around an axis substantially perpendicular to the magnet base 17, that is, in an inclined state in the melting furnace 25. That is, the surface of the molten metal 30 rotates in parallel with the surface of the magnet base 17 (the upper surface of the lifted permanent magnet 22). That is, in the present apparatus, as described above, the permanent magnet 22 rotates in a state where it is inclined by the angle θ. If it is assumed that it is horizontal (θ = 0 °), the molten metal 30 rotates with the center portion recessed. In this case, the molten metal 30 rotates assuming that the flow is close to rectification. With this, aluminum cannot be dissolved with high efficiency. On the other hand, in the present embodiment, it is inclined by the angle θ. For this reason, as shown in FIG. 2, the molten metal 30 is rotated in a state where the liquid level is inclined by the lines of magnetic force. That is, the plurality of magnets 22, 22,... Substantially rotate the molten metal in the melting furnace 25 while the surface of the molten metal rotates when the support base 6 is raised from a horizontal position. It is driven to rotate along the plate 17 while being inclined with respect to the horizontal plane. For this reason, the movement of the molten metal 30 becomes an irregular and intense movement. As a result, even if raw materials (such as aluminum shavings) are introduced into the molten metal 30, the raw materials do not float as they are in the molten metal 30, and the raw materials are efficiently stirred into the molten metal 30. Will surely dissolve in a short time.

In order to effectively perform such agitation, it is desirable that the strength of the permanent magnet 22 is such that the magnetic field strength inside the bottom surface of the melting furnace 25 is 0.2 to 0.2 T or more. Further, the rotational speed of the permanent magnets 22 (magnet pairs), that is, the magnet base 17, is preferably about 60 to 250 rpm when the permanent magnets 22 are arranged in two pairs of magnet pairs as shown in FIG.
That is, this rotational speed is the number of permanent magnets 22, 22... Provided on the magnet base 17, that is, a pair of permanent magnets 22, 22 (magnet pairs) adjacent to each other and having different magnetic poles. Depends on the number of As shown in FIG. 3, when there are two pairs of magnets, it is about 60-250 rpm, as shown in FIG. 4, when it is four sets, it is about 30-125 rpm, and further, when it is eight sets, it is 15-62. About 5 rpm. That is, when the number of magnet pairs is n, it is desirable that the speed be about (120 / n)-(500 / n) rpm. The meaning of these rotational speeds is as follows. It is defined that the period is 1 Hz when the number of magnet pairs passing through the reference point is one per second by the rotation of the magnet base 17. This means that it is desirable to rotate at a rotation speed such that this cycle is about 2-8.33 Hz.

  Further, the melting furnace 25 does not necessarily have the bottom surface inclined by an angle θ, and even if the inclination is equal to or smaller than θ, and as shown in FIG.

  6 (a) and 6 (b) show an embodiment in which the apparatus shown in FIGS. 1 and 2 is used as an auxiliary furnace 41, and the molten metal melted here is poured into a larger large furnace 42 than that. Show. That is, the molten metal 43 melted in the auxiliary furnace 41 flows into the large furnace 42 on the frame 46 from the gap 44 of the partition 45 between the auxiliary furnace 41 and the large furnace 42. In FIG. 6, the same members as those in FIGS. 1 and 2 are denoted by the same reference numerals.

The longitudinal section explanatory drawing of the embodiment of the present invention, and the enlarged view of each part. FIG. 2 is a longitudinal explanatory view of the operation state of FIG. 1. The top view and side view which show the example of arrangement | positioning of the permanent magnet of FIG. The top view which shows the example from which the example of arrangement | positioning of a permanent magnet differs. FIG. 5 is a longitudinal explanatory view showing a different example of the embodiment of the present invention. The top view of the example of the furnace which applied the apparatus of FIG. 1, and longitudinal cross-sectional explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Magnetic field generating part 4 Hinge 6 Case 17 Magnet base 22 Permanent magnet 25 Melting furnace 30 Molten metal 41 Auxiliary furnace 42 Large-sized furnace 43 Molten metal

Claims (5)

A melting furnace body for melting raw materials into molten metal,
A stirrer installed below the bottom of the bottom surface of the melting furnace body, and stirring the molten metal in the melting furnace body by applying a magnetic field to move it,
With
The stirring device
A frame as a table placed on the floor;
For the magnet, one end side is attached to the frame so as to be rotatable around a substantially horizontal first axis, and the other end side is capable of rotating up and down around the first axis. A support base;
The support base is pivotally supported so as to be rotatable around a second axis that takes a substantially vertical position when the support base is in a substantially horizontal position, and the second axis is the undulation of the support base. A rotating plate that changes angle with movement,
A plurality of magnets fixed on the rotating plate, and the magnets return to another magnet after a magnetic field line from one of them passes through the molten metal in the melting furnace body. When the support base is in a state of rising from a horizontal position in association with the rotation of the rotating plate in this state, the molten metal in the melting furnace body is placed on the surface of the molten metal. A plurality of magnets that can be driven to rotate along a rotating plate while being inclined with respect to a horizontal plane;
A melting furnace equipped with a stirrer.   The melting furnace with a stirrer according to claim 1 or 2, wherein a bottom surface of the melting furnace body is inclined with respect to a horizontal plane.   The melting furnace with a stirrer according to claim 1 or 2, wherein the rotation speed of the magnet on the rotating plate is configured to be speed-controllable. A stirrer installed below the melting furnace body, stirring the molten metal in the melting furnace body configured to melt the raw material by applying an alternating magnetic field thereto,
The stirring device
A frame as a table placed on the floor;
For the magnet, one end side is attached to the frame so as to be rotatable around a substantially horizontal first axis, and the other end side is capable of rotating up and down around the first axis. A support base;
The support base is pivotally supported so as to be rotatable around a second axis that takes a substantially vertical position when the support base is in a substantially horizontal position, and the second axis is the undulation of the support base. A rotating plate that changes angle with movement,
A plurality of magnets fixed on the rotating plate, and the magnets return to another magnet after a magnetic field line from one of them passes through the molten metal in the melting furnace body. When the support base is in a state of rising from a horizontal position in association with the rotation of the rotating plate in this state, the molten metal in the melting furnace body is placed on the surface of the molten metal. A plurality of magnets that can be driven to rotate along a rotating plate while being inclined with respect to a horizontal plane;
A stirrer characterized by comprising.   The stirring device according to claim 4, wherein the rotation speed of the magnet on the rotating plate is configured to be speed-controllable.

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