Dissolving furnace

Abstract

To make the register installed in the vortex chamber of the melting furnace detachable. [Solution] The melting furnace comprises a melting chamber 1 for storing molten metal, a vortex chamber 2 adjacent to the melting chamber for melting the material by vortex flow, a non-contact stirrer 3 for agitating the molten metal in the vortex chamber to generate vortices, a register 6 positioned in the internal space of the vortex chamber to complicate the flow of the vortex, and a jig 7 installed at the top of the vortex chamber for detachably suspending the register. Since the jig is installed at the top of the vortex chamber, the jig can be installed above the surface of the molten metal, making it easy to attach and detach the register.

Description

Technical Field

[0001] The present invention mainly relates to a melting furnace for melting treatment materials (such as cutting powder, beverage cans, crushed materials, long materials, etc.) of aluminum alloys.

Background Art

[0002] As an example of a melting furnace, there is one that includes a vortex chamber for melting the treatment material, a heat insulation case installed at the central part of the vortex chamber, a non-contact stirrer installed in the heat insulation case, and a register fitted into a fitting hole on the inner peripheral surface of the vortex chamber (Patent Document 1). Further, Patent Document 1 also discloses fixing the register to the outer peripheral surface of the heat insulation case so that it can be attached and detached, but the configuration for attaching and detaching is not disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a configuration different from the above configuration and make the register detachable.

Means for Solving the Problems

[0005] The present invention includes a melting chamber for storing molten metal, a vortex chamber adjacent to the melting chamber and melting the treatment material by a vortex flow, a non-contact stirrer for stirring the molten metal in the vortex chamber to generate a vortex flow, a register disposed in the internal space of the vortex chamber and against which the molten metal collides, and a jig installed at the upper part of the vortex chamber and for detachably suspending the register.

[0006] The jig may or may not be able to adjust the height of the register. To diversify the state of the vortex flow, it is desirable to do the following. The jig is to suspend the register so that its height can be adjusted.

[0007] The detailed configuration of the jig is not specified. To facilitate the attachment / detachment and height adjustment operations of the register, it is desirable that the jig be configured as follows: The jig comprises a case that penetrates vertically and a fastener that secures the top of the register housed in the case.

[0008] The detailed configuration of the fastener is not specified. To allow the position of the register to be adjusted and to diversify the vortex flow state, it is desirable to do the following: The fastener comprises a first fastener that fastens the register inside the case from a first direction when viewed from above, and a second fastener that fastens the register inside the case from a second direction that intersects the first direction when viewed from above. [Effects of the Invention]

[0009] According to the present invention, a jig is installed and a register can be detachably suspended from the jig. By positioning the jig above the surface of the molten metal, the register can be attached and detached even when molten metal is present. As a result, the process of attaching and detaching the register becomes easier. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view showing a melting furnace according to the first embodiment of the present invention, cut horizontally. [Figure 2] This is a cross-sectional view showing the melting furnace of the first embodiment cut vertically, indicating the cross-sectional position in Figure 1. [Modes for carrying out the invention]

[0011] An example of the basic configuration of a melting furnace is explained based on Figures 1 and 2. The melting furnace comprises a melting chamber 1, a vortex chamber 2 adjacent to the melting chamber 1, a frame F that forms the framework for creating the melting chamber 1 and the vortex chamber 2, a non-contact stirrer 3 that provides stirring force to the molten metal in the vortex chamber 2, and a rotating mechanism (not shown) that rotates the non-contact stirrer 3.

[0012] The melting chamber 1 is a room for storing molten metal. In plan view, the melting chamber 1 comprises an annular side wall 11, a door 12 for opening and closing a slag outlet 11a formed in part of the side wall 11, a ceiling wall 13 covering the space above the space enclosed by the side wall 11, a floor wall 14 closing the bottom of the space enclosed by the side wall 11, and a burner 4 positioned above the molten metal surface L in the melting chamber 1. In the illustrated example, the burner 4 is fixed to the ceiling wall 13, but it may also be fixed to the upper part of the side wall 11. The number of burners 4 is also not specified.

[0013] The side wall 11 is rectangular in plan view, and a vortex chamber 2 is installed adjacent to it in the center of the front-to-back width of one of its sides (the right side in Figure 1). Furthermore, the side wall 11 has a slag scraping port 11a at the top of the side other than the side on which the vortex chamber 2 is installed, which connects the internal space and the external space of the dissolution chamber 1. In the figure, the side wall 11 is formed in a U-shape in plan view at its top, with the opening of the U-shape facing left. A door 12 is also positioned along the side wall 11 on the outside of the slag scraping port 11a so that it can be opened and closed.

[0014] The floor wall 14 is mostly horizontal, and in a portion of it (on the left side in the diagram), a slope 14a is provided that gradually rises towards the slag removal outlet 11a.

[0015] The vortex chamber 2 is a chamber in which the material to be processed, such as aluminum alloy, is melted by a vortex flow. The vortex chamber 2 comprises an outer perimeter wall 21 that forms a circular inner surface when viewed from above, a bottom wall 23 that closes the opening at the lower end of the outer perimeter wall 21, and an openable and closable lid (not shown) that radially closes the upper end of the outer perimeter wall 21. An internal space 24 is formed inside the outer perimeter wall 21. The internal space 24 is a space (stirring space) 24 for stirring the molten metal. In addition, the vortex chamber 2 also includes, in the illustrated example, an insulating case 22 that is spaced apart inside the outer peripheral wall 21 when viewed from above. The insulated case 22 comprises a cylindrical inner circumferential wall 22a extending in the vertical direction and a sealing bottom 22b that closes the opening at the lower end of the inner circumferential wall 22a.

[0016] The bottom wall 23 is continuous with the floor wall 14, and the upper surfaces of the bottom wall 23 and the floor wall 14 are connected almost horizontally. The outer perimeter wall 21 is formed to rise up from the bottom wall 23. In this example, the bottom wall 23 and the outer perimeter wall 21 are joined together as a single unit. The insulation case 22 is installed on top of the bottom wall 23.

[0017] The outer peripheral wall 21 is cylindrical in shape, extending vertically. The inner surface of the outer peripheral wall 21 is also cylindrical. A portion of the outer peripheral wall 21 is formed in a state where it is joined to the side wall 11 of the dissolution chamber 1. The cylindrical inner surface of the outer peripheral wall 21 and the cylindrical outer surface of the inner peripheral wall 22a are concentric and radially separated, thereby forming the stirring space 24 in a cylindrical shape.

[0018] The lower part of the stirring space 24 is closed by the bottom wall 23, and the processing material is introduced from above the stirring space 24. The stirring space 24 is formed radially outward from the inner circumferential wall 22a, while a cylindrical space 25 is formed radially inward from the inner circumferential wall 22a. The cylindrical space 25 is outside the stirring space 24 and is radially isolated from it. A non-contact type stirrer 3 is housed in this cylindrical space 25.

[0019] The non-contact stirrer 3 is a moving magnetic field generator, that is, it generates a moving magnetic field to impart rotational force to the molten metal, and uses, for example, a permanent magnet. More specifically, the permanent magnet type non-contact stirrer 3, although not shown in the diagram, is, for example, a permanent magnet with alternating north and south poles arranged in the circumferential direction fixed on a plate. By rotating this non-contact stirrer 3 inside the inner circumferential wall 22a, a moving magnetic field is generated, and this moving magnetic field acts on the molten metal in the stirring space 24, inducing a current, which generates a vortex force in the molten metal, and thus the molten metal is stirred. If there is no inner circumferential wall 22a (insulating case 22) in the vortex chamber 2, the non-contact stirrer 3 is placed outside the outer circumferential wall 21. In this case, the non-contact stirrer 3 generates a moving magnetic field by applying a three-phase alternating current.

[0020] The rotating mechanism is supported above the vortex chamber 2, and the rotational force from the motor is transmitted via gears, belts, etc. to a rotating shaft that extends vertically upward from the center of the non-contact stirrer 3. That is, the non-contact stirrer 3 has a structure that is suspended by the rotating shaft.

[0021] Also, at the joint portion between the melting chamber 1 and the vortex chamber 2, a passage 5 that connects the internal space of the melting chamber 1 and the stirring space 24 of the vortex chamber 2 is formed in a state of penetrating through the side wall 11 of the melting chamber 1 and the outer peripheral wall 21 of the vortex chamber 2. The passage 5 is formed facing the portion where the upper surface of the floor wall 14 of the melting chamber 1 and the upper surface of the bottom wall 23 of the vortex chamber 2 are joined. Also, the passages 5 are formed at intervals in the circumferential direction of the outer peripheral wall 21. The molten metal can circulate between the stirring space 24 of the vortex chamber 2 and the internal space of the melting chamber 1 through the passage 5.

[0022] The frame F forms the outside of the melting chamber 1 and the vortex chamber 2. The melting chamber 1 and the vortex chamber 2 are made of refractory materials, specifically, materials obtained by curing refractory materials. The frame F is made of metal.

[0023] The above-described melting furnace starts the operation of the non-contact stirrer 3 and generates a moving magnetic field to swirl the molten metal in the stirring space 24 and generate a vortex flow. A processing material is introduced into the vortex flow of the molten metal from above the vortex chamber 2 to melt the processing material. The melting chamber 1 has an overflow portion (not shown) for overflowing the molten metal. For example, the overflow portion is a tap hole formed in the side wall 11. A tap plug can be inserted and removed from the tap hole. By using the melting furnace with the tap hole open, the molten metal surface L is set at the position of the tap hole, and thereby the molten metal surface L in the vortex chamber 2 is also maintained at a constant height.

[0024] In addition to the above-described basic configuration, the melting furnace according to the first embodiment of the present invention includes a register 6 disposed in the stirring space 24, a jig 7 for suspending the register 6 in a detachable and height-adjustable manner, and an installation tool 8 for detachably installing the jig 7 above the vortex chamber 2.

[0025] The jig 7 is installed above the vortex chamber 2. The installation position is above the molten metal surface L when the operation of the non-contact stirrer 3 is interrupted, and above the position where the vortex flow passes when it is in operation. The jig 7 comprises a case 71 that houses the upper part of the register 6, a bracket 72 that extends from the frame F to above the stirring space 24 and supports the case 71 above the stirring space 24, and a fastener 73 that fixes the register 6 to the case 71. The jig 7 is made of metal.

[0026] Bracket 72 is installed on the upper surface of vortex chamber 2. One end of bracket 72 is aligned with frame F, and the other end of bracket 72 is joined to case 71. In the illustrated example, frame F covers the outer surfaces of melting chamber 1 and vortex chamber 2. Specifically, frame F comprises, around vortex chamber 2, an adjacent frame portion f1 that covers the upper part of the outer surface of melting chamber 1 adjacent to vortex chamber 2, an outer periphery frame portion f2 that covers the outer circumference of vortex chamber 2, a detachable frame portion f3 positioned above vortex chamber 2 at a distance from the adjacent frame portion f1 and extending parallel to the outer surface of melting chamber 1 adjacent to vortex chamber 2 when viewed from above, and a plurality of joining frame portions f4 that join the adjacent frame portion f1 and the detachable frame portion f3 at multiple points when viewed from above. In the illustrated example, the bracket 72 comprises a detachable plate portion 72a that extends along the detachable frame portion f3 when viewed from above, and a suspension plate portion 72b that connects the case 71 located in the stirring space 24 to the detachable plate portion 72a.

[0027] Case 71 is cylindrical, penetrating in the vertical direction. When viewed from above, the inner surface of case 71 is rectangular. The rectangle is parallel to the left-right and front-back directions. In the illustrated example, the left-right direction is designated as the first direction d1, and the front-back direction as the second direction d2. The first direction d1 and the second direction d2 are orthogonal. Case 71 comprises a pair of first plates 71a facing the first direction d1 and a pair of second plates 71b facing the second direction d2. The pair of first plates 71a includes one that is joined to the bracket 72 and one that is located on the opposite side of the bracket 72. The first plate 71a located on the opposite side of the bracket 72 has a female screw hole (not shown) that penetrates through in the first direction d1. The pair of second plates 71b also have a female screw hole (not shown) that penetrates through in the second direction d2.

[0028] The fastener 73 comprises a first fastener 73a that is screwed into the female threaded hole of the first plate 71a from a first direction d1, and a second fastener 73b that is screwed into the female threaded hole of the second plate 71b from a second direction d2. The first fastener 73a and the second fastener 73b are bolts.

[0029] The register 6 is rod-shaped, more specifically, an elongated rectangular parallelepiped. The register 6 is made of refractory material. During operation of the non-contact stirrer 3, molten metal collides with the register 6, changing the vortex flow compared to when the register 6 is absent. The register 6 only needs to be removable from the case 71. There is not limited to one type of register 6; multiple types with different dimensions in the vertical direction or different sizes when viewed from above may be provided. In the illustrated example, the size of the register 6 when viewed from above is clearly smaller than the internal space of the case 71. More specifically, the dimensions of the register 6 in the first direction d1 and the dimensions in the second direction d2 are both smaller than the dimensions of the inner surface of the case 71 in the first direction d1 and the second direction d2, respectively. The position of the register 6 in the second direction d2 within the case 71 is displaced by the amount of screwing in of the pair of second fasteners 73b. Furthermore, the position of the register 6 in the first direction d1 within the case 71 is constant when only the register 6 is housed in the case 71. However, if a spacer (not shown) is placed in the case 71 on the bracket 72 side, and the register 6 is housed on the opposite side of the spacer from the bracket 72, the position of the register 6 in the first direction d1 within the case 71 is constant, but it displaces according to the thickness of the spacer.

[0030] In the illustrated example, the mounting device 8 is a clamp 8. The clamp 8 clamps the detachable frame portion f3 and the detachable plate portion 72a when they are overlapped. The clamp 8 comprises a U-shaped clamp body 81, a screw portion 82 that is screwed into the clamp body 81 and is reciprocating within the space of the clamp body 81, a retaining portion 83 fixed to one end of the screw portion 82 within the space of the clamp body 82, and a handle 84 attached to the other end of the screw portion 82 outside the space of the clamp body 81. When the handle 84 is turned, the screw portion 82 moves forward or backward depending on the direction of rotation, and the clamp 8 clamps or unclams the object.

[0031] In the melting furnace of the above embodiment, a jig 7 is installed on the frame F via a fixture 8, and a register 6 is detachably suspended from the jig 7. By positioning the jig 7 above the molten metal surface L, the register 6 can be attached and detached even when there is molten metal present. As a result, the attachment and detachment of the register 6 becomes easier. Furthermore, since the jig 7 suspends the register 6 in a height-adjustable manner, the vertical position of the register 6 can be adjusted, and the vortex level can be adjusted according to the material and quantity of the material being processed. Furthermore, since the jig 7 comprises a case 71 and a fastener 73, the register 6 can be attached and detached, and its height can be adjusted, simply by operating the fastener 73. Moreover, since the fastener 73 comprises a first fastener 73a and a second fastener 73b, the position of the register 6 can be adjusted in a first direction d1 and a second direction d2, thereby adjusting the collision state of the molten metal with the register 6 and diversifying the vortex flow. In addition, since the jig 7 is detachable by the mounting fixture 8, the register 6 can be attached and detached together with the jig 7.

[0032] The present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from its spirit. For example, in the above embodiment, the structure for installing the jig 7 on the upper part of the vortex chamber 2 involved joining one end of the bracket 72 to the frame F, but the present invention is not limited to this. [Explanation of Symbols]

[0033] 1 Melting chamber 11 Side wall 11a Noro scraper outlet 12 doors 13 Ceiling and Wall 14 Floor and Wall 14a Slope 2 vortex chamber 21 Outer wall 22 Insulated Cases 22a Inner wall 22b blockade bottom 23 Bottom wall 24 Stirring space 25 Space 3. Non-contact stirrer 4 burners 5 aisles 6 registers 7. Jig 71 cases 71a First board 72a Second board 72 brackets 73 Fasteners 73a First fastener 73b Second fastener 8 Installation tools 81 Clamp body 82 Screw part 83 Pressing part 84 handle d1 First direction d2 Second direction F Frame f1 Adjacent frame section f2 Outer frame section L hot water surface

Claims

1. A melting furnace characterized by comprising: a melting chamber for storing molten metal; a vortex chamber adjacent to the melting chamber for melting the material to be processed by a vortex flow; a non-contact stirrer for agitating the molten metal in the vortex chamber to generate a vortex flow; a register positioned in the internal space of the vortex chamber upon which the molten metal collides; and a jig installed above the vortex chamber for detachably suspending the register.

2. The melting furnace according to claim 1, characterized in that the jig suspends the register in a height-adjustable manner.

3. The melting furnace according to claim 2, characterized in that the jig comprises a case that penetrates in the vertical direction and a fastener that secures the upper part of a register housed in the case.

4. The melting furnace according to claim 3, characterized in that the fasteners include a first fastener for fastening the register inside the case from a first direction when viewed from above, and a second fastener for fastening the register inside the case from a second direction intersecting the first direction when viewed from above.

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