JP4378818B2 - Induction heating melting furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bottom pouring mechanism of an induction heating melting furnace that melts metal by induction heating.
[0002]
[Prior art]
An induction heating melting furnace is a method in which metal is introduced into a container-shaped furnace body formed by arranging vertically-divided conductive segments that are electrically insulated from each other in the circumferential direction, and then around the furnace body. AC electric power is supplied to the induction heating coil arranged in, and an alternating magnetic field is generated. And when the metal accommodated in the furnace main body is induction-heated and a metal melt | dissolves and it becomes a molten metal, it is comprised so that a molten metal may be taken out from the hot water outlet formed in the bottom part of the furnace main body.
[0003]
In the induction heating melting furnace configured as described above, the outlet used for taking out the molten metal needs to be kept closed until the metal is melted to become a molten metal, but immediately when the molten metal becomes a molten metal. It is desirable to be able to switch to the open state.
[0004]
Therefore, for example, in Japanese Patent Application Laid-Open No. 11-6687, as shown in FIGS. 8 and 9, a tap is formed separately from the melting induction heating coil 52 disposed in the housing portion 51 of the furnace body 50. An arrangement has been proposed in which an induction heating coil 54 for hot water is arranged in the hot water outlet 53 and electric power can be supplied to the coil 54 from a hot water supply 55 for hot water. And the melting furnace comprised in this way can solidify the metal around the hot-water part 53, and can keep the hot-water tap closed if the power supply to the induction heating coil 54 for hot water is stopped. If the electric power is supplied to the induction heating coil 54 for hot water, the metal around the hot water portion 53 can be preferentially heated by induction and dissolved, so that the hot water outlet can be switched to the open state in a short time. .
[0005]
[Problems to be solved by the invention]
However, in the configuration in which the hot water outlet is opened by dissolving the metal around the hot water portion 53 as in the conventional case, the hot water portion 53 is much smaller in size than the accommodating portion 51. The induction heating coil 54 disposed in the periphery also has a small size. On the other hand, the electric power supplied to the induction heating coil 54 needs to be able to generate a magnetic field large enough to dissolve the metal around the hot water outlet 53. As a result, when the tap is opened, a very large current flows in a narrow range, so that the coil loss of the induction heating coil 54 becomes particularly significant, and, for example, about 50% of the power output is consumed as the coil loss. It will be. As a result, in the above-described conventional configuration, since the power at the time of opening the tap is large, it is necessary to prepare a power supply with a large output.
[0006]
Therefore, the present invention provides an induction heating melting furnace capable of increasing the ratio of electric power that can be input to the molten metal in the bottom portion hot water discharge mechanism and the skull thereof and reducing the electric power of the power source necessary for the hot water discharge.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 is provided at the bottom of a furnace main body that accommodates molten metal, and the furnace is opened by opening the outlet port by induction heating and melting the skull. Remove molten metal from the body Equipped with bottom tapping mechanism Induction heating dissolution In the furnace Leave The bottom tapping mechanism is A hot water structure formed to have the hot water outlet by arranging vertically segmented conductive segments electrically insulated from each other, and an outer periphery of the hot water structure. An induction heating coil that inducts and heats an alternating magnetic field through a skull around the outlet through the tapping structure, and a tapping power source that supplies the AC power to the induction heating coil. , Each conductive segment of the tapping structure G , An inlet port for introducing the molten metal, an outlet port provided below the inlet port to form the outlet, and an outer periphery provided on the outer circumferential side of the inlet port in the circumferential direction An intermediate slit formed in at least a part of the introduction port portion among the end portion, the introduction port portion, and the outer peripheral end portion, and communication with the inside of the introduction port portion, the outflow port portion, and the outer peripheral end portion And a cooling water channel that is detoured so as to avoid the intermediate slit, and supplies cooling water to the cooling water channel from a water supply port provided at the outer peripheral end, and the outer peripheral end The cooling water in the cooling water channel is discharged from a drain outlet provided in the section. It is characterized by having.
[0008]
According to said structure, when the eddy current of a skull part increases by an intermediate slit, the Joule power loss which generate | occur | produces in a skull part will increase. As a result, more alternating magnetic fields penetrate the skull and perform induction heating than when there is no intermediate slit. Thereby, even when the AC power to the induction heating coil is reduced, the skull can be sufficiently induction-heated and melted. As a result, the current flowing through the induction heating coil at the time of opening the hot water outlet can be reduced and the coil loss of the induction heating coil can be reduced, so that it is possible to reduce the power required for the hot water.
[0009]
The invention of claim 2 is the induction heating dissolution of claim 1 In the furnace And the tapping structure is provided in an opening formed in the bottom of the furnace body, The introduction port is It is inclined so as to reduce the opening area from the upper edge to the bottom in contact with the inner periphery of the opening. And , The tap is Hollow cylinder And , The cooling water channel Connected to the water supply / drainage piping at the outer edge ing It is characterized by that. According to said structure, similarly to the structure of Claim 1, the electric current which flows into the induction heating coil at the time of the tap opening of a tap is reduced, the coil loss of an induction heating coil is reduced, and the electric power required for tapping is reduced. In addition to being able to do so, it is possible to provide a tapping structure by forming an opening at an arbitrary location in the bottom of the furnace body, so that the degree of freedom in design can be expanded.
[0010]
The invention of claim 3 is claimed in claim 1 or 2 In Induction heating dissolution as described In the furnace The intermediate slit of the inlet port Only It is characterized by being formed. According to the above configuration , Outside Since the peripheral edge is not divided by the intermediate slit, after forming the cooling water channel at the inlet and outlet so that the cooling water channel is not divided by the intermediate slit, It can be gathered at a place and connected to the water supply / drainage pipe. As a result, it is possible to reduce the number of connections compared to connecting the water supply and drainage pipes for water supply and drainage to each conductive segment of the small-sized tap water structure. Workability can be improved.
[0011]
The invention of claim 4 is the induction heating dissolution according to any one of claims 1 to 3. In the furnace In this case, one or more intermediate slits are formed along the longitudinal direction of the conductive segment. According to said structure, while being able to form an intermediate slit easily, the eddy current of a skull part can be increased efficiently.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
The bottom pouring mechanism of the present embodiment is provided in an induction heating melting furnace as shown in FIG. The induction heating melting furnace has a copper furnace body 1 that houses a melting object 10 such as titanium. The furnace body 1 may be made of pure copper or copper alloy, or may be made of gold or silver having a low electrical resistivity, or stainless steel depending on the case. In addition to titanium, the object to be dissolved 10 can include reactive metals made of zirconium, hafnium, chromium, niobium, tantalum, molybdenum, uranium, rare earth metals, thorium, and metals selected from these alloys. .
[0013]
The furnace main body 1 includes a cylindrical side wall 2 around which an induction heating coil 6 is wound on the outer peripheral side, and a flat bottom wall 3 that forms the bottom of the side wall 2. The side wall 2 and the bottom wall 3 are formed by arranging vertically-divided conductive segments 5 that are electrically insulated from each other in the circumferential direction. Insulation is performed by interposing an insulating member between the conductive segments 5 or by separating the conductive segments 5 from each other. Moreover, these electroconductive segments 5 are equipped with a cooling water channel inside, and cooling water is flowing through this cooling water channel.
[0014]
Further, the bottom wall 3 of the furnace body 1 is provided with a bottom pouring mechanism 11 formed to have a pouring gate. The bottom pouring mechanism 11 includes an opening 4 formed in the bottom wall 3, a pouring structure 7, a first induction heating coil 13, and a second induction heating coil 14. The opening 4 is disposed at a substantially middle position between the outer peripheral end of the bottom wall 3 and the center point, and is formed to have an inverted conical wall surface in a range from the top surface position to the middle position of the bottom wall 3. It consists of the inclined penetration part 4a and the columnar penetration part 4b formed so that it may have a cylindrical wall surface in the range from an intermediate position to a lower surface position.
[0015]
A tapping structure 7 is fixed to the columnar through portion 4b. As shown in FIG. 2, the tapping structure 7 has an introduction port portion 7 a formed in a hollow inverted conical shape so as to reduce the opening area from the upper edge portion to the lower portion. The inner wall surface of the introduction port portion 7a has an upper edge that is aligned with a lower edge portion of the inclined penetrating portion 4a so that the flow of the molten metal from the bottom wall 3 is smooth, and the inclined angle is the inclined penetrating portion 4a. Is consistent with the inclination angle. In addition, a hollow tubular outlet 7b is integrally formed at the lower end of the inlet 7a, and the inlet 7a and outlet 7b are formed in a funnel shape as a whole.
[0016]
On the other hand, the outer wall surface of the introduction port portion 7a is formed in an outer shape that coincides with the columnar through portion 4b of the opening 4 and is columnar so as to fix the tapping structure 7 to the bottom wall 3 in the left-right direction. It is fitted to the penetration part 4b. Further, a flange-like outer peripheral end portion 7 c is projected from the lower surface on the outer peripheral side of the introduction port portion 7 a, and the outer peripheral end portion 7 c fixes the tapping structure 7 in the vertical direction with respect to the bottom wall 3. In this way, it is in contact with the lower surface of the bottom wall 3.
[0017]
As shown in FIGS. 3 and 4, the tapping structure 7 is formed by arranging a plurality of vertically-divided conductive segments 8 so as to be insulated from each other in the circumferential direction. The conductive segment 8 may be made of pure copper or copper alloy, as well as gold or silver having a low electrical resistivity, or in some cases stainless steel, as in the case of the furnace body 1 described above.
[0018]
The conductive segment 8 is formed so as to constitute a part of the introduction port portion 7 a, the outflow port portion 7 b, and the outer peripheral end portion 7 c of the tapping structure 7. Further, an intermediate slit 8a for increasing the flow area of eddy current to the skull portion is formed in the introduction port portion 7a of each conductive segment 8. The intermediate slit 8a is formed by cutting a range from the upper edge portion to the lower portion linearly along the longitudinal direction of the conductive segment 8 at the intermediate position in the width direction of the introduction port portion 7a.
[0019]
Further, the intermediate slit 8a is formed except for the outer peripheral end portion 7c of the introduction port portion 7a. The outer peripheral end portion 7c is formed with a water supply port and a water discharge port in one place, and these water supply ports and the water discharge port are collectively connected to the water supply / drainage pipe. The water supply port and the water discharge port are communicated with each other via a cooling water channel formed inside the introduction port part 7a and the outlet part 7b. After the cooling water channel is detoured from the inlet port 7a on one side of the intermediate slit 8a to the inlet port 7a on the other side of the intermediate slit 8a through the lower outlet port 7b so as to avoid the intermediate slit 8a In the outer peripheral end portion 7c, both end portions are gathered at the arrangement positions of the water supply port and the drain port.
[0020]
The first induction heating coil 13 and the second induction heating coil 14 are arranged along the outer wall surface on the outer peripheral sides of the introduction port portion 7a and the outlet portion 7b in the tapping structure 7 described above. As shown in FIG. 1, a power source 15 for hot water that outputs AC power is connected to the induction heating coils 13 and 14. The hot water supply power source 15 can output the coagulation power supply unit 16 capable of outputting the second frequency AC power enough to solidify the object 10 to be melted, and the first frequency AC power enough to melt the object 10 to be melted. Power supply unit 17 for melting. The first frequency of the melting power supply unit 17 is set to be higher than the second frequency of the coagulation power supply unit 16. Specifically, the first frequency of the melting power supply unit 17 is set to a high frequency of about 4 kHz, and the second frequency of the coagulation power supply unit 11 is a frequency of, for example, a commercial power supply (a low frequency of about 50 to 100 Hz). ) Is set. The hot water power supply 15 is connected to a power supply control device 18, and the power supply control device 18 can switch between the operation of the solidification power supply unit 16 and the melting power supply unit 17 in the hot water supply power source 15. .
[0021]
The power control device 18 is also connected to a melting power source 19. The melting power source 19 is connected to the induction heating coil 6 provided so as to surround the furnace body 1 described above. Then, the melting power supply 19 supplies AC power having a frequency that can dissolve the object 10 to be melted to the induction heating coil 6 to generate an alternating magnetic field along the wall surfaces of the bottom wall 3 and the side wall 2.
[0022]
In the above configuration, when melting and hot water is melted, the melting object 10 is melted by energizing the melting induction heating coil 6 disposed on the outer peripheral side of the side wall 2. When the melting progresses and the molten metal melted in the furnace body 1 reaches a predetermined molten state, the hot water starts to be discharged.
[0023]
That is, high frequency power of the first frequency is supplied to the induction heating coils 13 and 14 from the melting power source 17 of the hot water source 15. When high frequency power of the first frequency is supplied to the second induction heating coil 14 on the lower side, a high frequency alternating magnetic field is generated by the high frequency power, and this alternating magnetic field is a thin solidified layer (penetration) on the inner surface side of the outlet portion 7b. An eddy current is applied to the depth. Thereby, since the current density in this thin solidified layer is high, the melted object 10 solidified on the inner surface of the outlet portion 7b of the tapping structure 7 is dissolved from the surface, and the solidified layer falls downward. The hot water can be discharged.
[0024]
On the other hand, the upper induction heating coils 13 and 14 generate a high-frequency alternating magnetic field by the high-frequency power of the first frequency, and this alternating magnetic field passes through the introduction port portion 7a of the conductive segment 8 and then enters the introduction port portion 7a. An eddy current is caused to flow through a thin solidified layer (penetration depth) on the inner surface side.
[0025]
When the shortage of the alternating magnetic field in the conductive segment 8 is dealt with by increasing the amount of electric power to the induction heating coils 13 and 14 as in the prior art, the size is small enough to surround the periphery of the inlet portion 7a. When a large current flows through the induction heating coils 13 and 14, the coil loss of the induction heating coils 13 and 14 becomes extremely large.
[0026]
On the other hand, in the present embodiment, as shown in FIG. 2, the introduction port portion 7a of the conductive segment 8 is divided into two by the intermediate slit 8a, whereby an eddy current flows to the skull portion in the introduction port portion 7a. The flow area is increased. As a result, even if the power to the induction heating coils 13 and 14 is reduced by reducing the shortage of the alternating magnetic field due to the introduction port 7a (conductive segment 8), an eddy current exceeding a predetermined value is applied to the solidified layer. The solidified layer can be dissolved in a short time. Thereby, since the electric current which flows into the induction heating coils 13 and 14 can be reduced, it becomes possible to reduce the coil loss of the induction heating coils 13 and 14, and by extension, opening of the tapping structure 7 (outlet opening) The required power at the time can be reduced.
[0027]
When an eddy current flows through a thin layer of the solidified layer that is in contact with the inlet port 7a as described above, the skull 21 of the inlet port 7a is caused to become a solidified interface portion by pseudo-insulation as shown in FIG. To melt in contact with molten metal. That is, the portion in contact with the conductive segment 8 is induction-heated to form a pseudo heat insulating layer and the heat absorption of the conductive segment 8 is suppressed, so that the dissolution proceeds from the solidification interface 21 ′. Further, the flow V of the molten metal in this portion also promotes the reduction of the skull 21 of the inlet port portion 7a, and finally the skull 21 becomes thinner in both the inlet port portion 7a and the outlet port portion 7b, so that the molten metal pressure is increased by the pressure of the molten metal. Will do.
[0028]
Next, when stopping tapping, the second induction heating coil 14 of the outlet portion 7b and the first induction heating coil 13 of the inlet portion 7a are connected to the melting power source unit 17 from, for example, a low frequency commercial frequency. Supply power. The low frequency magnetic field generated by this low frequency power generates eddy currents from the surface of the melt to a fairly thick layer. As a result, the current density is lowered, so that a magnetic pressure is generated in the molten metal more exclusively than induction heating. By this phenomenon, the flow of the molten metal becomes narrow at the outlet portion 7b, and the flow rate is suppressed. And in the inlet part 7a, the effect which lifts a molten metal upwards arises, and the amount of hot water discharged is suppressed by the downward pressure reduction.
[0029]
Thereafter, when the amount of the molten metal passing through the tapping structure 7 is reduced, the amount of heat supplied from the molten metal is reduced, and solidification starts from a portion in contact with the conductive segment 21s of the introduction port portion 7a. And the amount of hot water further decreases, and finally hot water stops. In addition, even if the hot water supply 15 includes only the melting power supply unit 17, the skull layer near the introduction port 7 a increases even if the high frequency power from the melting power supply unit 17 is simply stopped. By doing so, the opening to the outflow port 7b is clogged by the skull 21, and the outflow amount decreases. And the skull 21 increases more and more, the opening part 25 is closed, and a hot-water supply stops like the above.
[0030]
In the present embodiment, the side wall 2 is erected in the vertical direction, but the present invention is not limited to this, and the side wall 2 may be inclined so as to increase the radius from the bottom wall 34 to the upper edge. good. In this case, the melting target object 10 that evaporates hardly comes into contact with the upper side wall 3 from the molten metal surface, so that the adhesion amount of the melting target object 10 to the side wall 3 can be reduced. Further, since the gas rising from the molten metal hardly contacts the side wall 3, the gas in the molten metal can be sufficiently removed by reducing the exhaust resistance of the gas.
[0031]
As described above, the bottom pouring mechanism 11 of the present embodiment is provided at the bottom of the furnace main body 1 that accommodates the molten metal, and the furnace is opened by opening the pouring spout by melting the skull by induction heating. A tapping structure 7 for taking out the molten metal from the main body 1 and having a tapping outlet by arranging the vertically divided conductive segments 8 electrically insulated from each other in the circumferential direction; A first induction heating coil 13 disposed on the outer periphery of the tapping structure 7 and inductively heating the skull 21 around the tapping outlet through the tapping structure 7 by supplying AC power and induction heating, and first induction heating A hot water supply 15 for supplying AC power to the coil 13 is provided, and each conductive segment 8 of the hot water structure 7 increases the flow region of the eddy current to the skull generated by the penetration of the alternating magnetic field. for During slit 8a is to the formed structure.
[0032]
According to said structure, since the flow area | region of the eddy current to a skull part increases by the intermediate slit 8a, it means that more alternating magnetic fields osmose | permeate the skull 21 and perform induction heating than the case where there is no intermediate slit 8a. Become. As a result, the current flowing through the induction heating coils 13 and 14 when the tap is opened can be reduced, and the coil loss of the induction heating coils 13 and 14 can be reduced.
[0033]
In the present embodiment, one intermediate slit 8a is formed along the longitudinal direction of the conductive segment 8. However, the present invention is not limited to this, and a plurality of intermediate slits 8a may be formed. Further, one or more intermediate slits 8a may be formed in a direction that intersects the vertical direction, such as a vertical direction, or is formed by mixing the vertical direction and the cross direction. Also good.
[0034]
Moreover, in this embodiment, the hot water structure 7 is provided in the opening part 4 formed in the bottom part of the furnace main body 1, as shown in FIG. The inlet port 7a inclined so as to reduce the opening area from the bottom to the bottom, the hollow cylindrical outlet 7b integrally formed with the inlet 7a, and the inlet 7a and the flow The outlet portion 7b is formed so as to avoid the intermediate slit 8a, and has a cooling water passage connected to the water supply / drainage pipe at the outer peripheral end portion 7c of the introduction port portion 7a. Thereby, since the opening part 4 can be formed in the arbitrary places in the bottom part of the furnace main body 1, and the tapping structure 7 can be provided, it becomes possible to expand the freedom degree of design.
[0035]
In the present embodiment, the intermediate slit 8a is formed excluding the outer peripheral end portion 7c of the introduction port portion 7a as shown in FIGS. Thereby, since the outer peripheral end portion 7c of the inlet port portion 7a is not divided by the intermediate slit 8a, the cooling water channel is formed after the cooling water channel is formed in the inlet port portion 7a and the outlet port portion 7b so as not to be divided by the intermediate slit 8a. These water supply ports and water discharge ports can be gathered at one place on the outer peripheral end 7c and connected to the water supply / drainage piping. As a result, the number of connections can be reduced as compared with the case where the water supply / drainage pipes for water supply and drainage are connected to the respective conductive segments 8 of the small-sized tapping structure 7, so that the connection and maintenance of the water supply / drainage pipes are possible. Workability at the time of inspection can be improved.
[0036]
As shown in FIGS. 5 and 6, the intermediate slit 8a may be formed including the outer peripheral end portion 7c of the introduction port portion 7a. In this case, since the intermediate slit 8a can be formed in one work process of lowering the cutting blade from above the introduction port portion 7a to a predetermined position, the intermediate slit 8a can be formed easily and in a short time. it can.
[0037]
【The invention's effect】
The invention according to claim 1 is provided at the bottom of the furnace main body containing the molten metal, and the molten metal is taken out from the furnace main body by opening the outlet port by induction heating and melting the skull. Equipped with bottom tapping mechanism Induction heating dissolution In the furnace Leave The bottom tapping mechanism is A hot water structure formed to have the hot water outlet by arranging vertically segmented conductive segments electrically insulated from each other, and an outer periphery of the hot water structure. An induction heating coil that inducts and heats an alternating magnetic field through a skull around the outlet through the tapping structure, and a tapping power source that supplies the AC power to the induction heating coil. , Each conductive segment of the tapping structure G , An inlet port for introducing the molten metal, an outlet port provided below the inlet port to form the outlet, and an outer periphery provided on the outer circumferential side of the inlet port in the circumferential direction An intermediate slit formed in at least a part of the introduction port portion among the end portion, the introduction port portion, and the outer peripheral end portion, and communication with the inside of the introduction port portion, the outflow port portion, and the outer peripheral end portion And a cooling water channel that is detoured so as to avoid the intermediate slit, and supplies cooling water to the cooling water channel from a water supply port provided at the outer peripheral end, and the outer peripheral end The cooling water in the cooling water channel is discharged from a drain outlet provided in the section. It is the composition which is.
[0038]
According to the above configuration, more alternating magnetic fields can penetrate the skull and perform induction heating than when there is no intermediate slit, so even if the AC power to the induction heating coil is reduced, the skull is sufficient. It can be dissolved by induction heating. As a result, the current flowing through the induction heating coil at the time of opening the hot water outlet can be reduced and the coil loss of the induction heating coil can be reduced, so that it is possible to reduce the power required for the hot water.
[0039]
The invention of claim 2 is the induction heating dissolution of claim 1 In the furnace And the tapping structure is provided in an opening formed in the bottom of the furnace body, The introduction port is It is inclined so as to reduce the opening area from the upper edge to the bottom in contact with the inner periphery of the opening. And , The tap is Hollow cylinder And , The cooling water channel Connected to the water supply / drainage piping at the outer edge ing It is a configuration. According to said structure, similarly to the structure of Claim 1, the electric current which flows into the induction heating coil at the time of the tap opening of a tap is reduced, the coil loss of an induction heating coil is reduced, and the electric power required for tapping is reduced. In addition to being able to do so, it is possible to provide a tapping structure by forming an opening at an arbitrary location in the bottom of the furnace body, so that the degree of freedom in design can be expanded.
[0040]
The invention of claim 3 is claimed in claim 1 or 2 In Induction heating dissolution as described In the furnace The intermediate slit of the inlet port Only It is the structure formed. According to the above configuration , Outside Since the peripheral edge is not divided by the intermediate slit, after forming the cooling water channel at the inlet and outlet so that the cooling water channel is not divided by the intermediate slit, It can be gathered at a place and connected to the water supply / drainage pipe. As a result, it is possible to reduce the number of connections compared to connecting the water supply and drainage pipes for water supply and drainage to each conductive segment of the small-sized tap water structure. Workability can be improved.
[0041]
The invention of claim 4 is the induction heating dissolution according to any one of claims 1 to 3. In the furnace In this case, one or more intermediate slits are formed along the longitudinal direction of the conductive segment. According to said structure, while being able to form an intermediate slit easily, the flow area | region of the eddy current to a skull part can be increased efficiently.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of a conductive heating melting furnace provided with a bottom pouring mechanism.
FIG. 2 is a longitudinal sectional view of a tapping structure.
FIG. 3 is a perspective view of a main part of a tapping structure.
4 is a cross-sectional view taken along line AA ′ in FIG. 3. FIG.
FIG. 5 is a perspective view of a main part of a tapping structure.
6 is a cross-sectional view taken along the line AA ′ in FIG. 3;
FIG. 7 shows a conventional example and is an explanatory view showing a schematic configuration of an induction heating melting furnace provided with a bottom pouring mechanism.
[Explanation of symbols]
1 Furnace body
2 Side wall
3 Bottom wall
4 openings
4a Inclined penetration
4b Columnar penetration
5 Conductive segment
6 Induction heating coil
7 Hot spring structure
7a inlet
7b Outlet part
7c Outer peripheral edge
8 Conductive segment
8a Middle slit
10 objects to be dissolved
11 Bottom hot spring mechanism
13 First induction heating coil
14 Second induction heating coil
15 Power supply for hot water
16 Power supply for solidification
17 Power unit for melting
18 Power supply control device
19 Power supply for melting
21 skull
31 Furnace body
32 Hot Spring Department
33 Bottom hot spring mechanism

Claims (4)

Provided at the bottom of the furnace body housing a molten metal, by a tap hole in the cap opening state by dissolving in induction heating skull, induction heating melting furnace having a bottom tapping mechanism for taking out the molten metal from the furnace body Oite to,
The bottom tapping mechanism is
A tapping structure formed so as to have the tapping outlet by arranging the vertically divided conductive segments electrically insulated from each other in the circumferential direction;
An induction heating coil that is disposed on the outer periphery of the tapping structure, and inductively heats an alternating magnetic field through a skull around the tapping outlet via the tapping structure by supplying AC power;
A hot water supply for supplying the AC power to the induction heating coil,
Each conductive segment of the tapping structure,
An inlet port through which the molten metal is introduced;
An outlet portion provided below the inlet port to form the outlet;
An outer peripheral end provided on the outer peripheral side in the circumferential direction of the introduction port; and
Of the introduction port portion and the outer peripheral end portion, at least an intermediate slit formed in a part of the introduction port portion,
A cooling water channel that is provided in communication with the inside of the introduction port portion, the outflow port portion, and the outer peripheral end portion, and is detoured so as to avoid the intermediate slit;
Comprising
A cooling water is supplied to the cooling water channel from a water supply port provided at the outer peripheral end portion, and the cooling water of the cooling water channel is discharged from a drain port provided at the outer peripheral end portion. Heating melting furnace. The tapping structure is
Provided in the opening formed in the bottom of the furnace body,
The inlet portion is inclined to reduce the opening area toward the bottom from the upper edge in contact with the inner periphery of the opening,
The tap hole is hollow cylindrical,
The cooling water channel, induction heating furnace according to claim 1, characterized in that it is connected to the water supply and drainage pipes by the outer peripheral edge. It said intermediate slit, induction heating furnace according to claim 1 or 2, characterized in that it is a mini formed of the inlet portion. 4. The induction heating melting furnace according to claim 1, wherein at least one intermediate slit is formed along a longitudinal direction of the conductive segment . 5.

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