JP2020020554A - Melting device - Google Patents

Abstract

To provide a melting device capable of stably melting a melting material currently melted and a melting material to be melted after the currently melted melting material in a continuous manner.SOLUTION: A melting device 100 includes: a heating coil part 11 into which a melting material 200 (a first melting material) is inserted; and a support part 20 which includes through holes 22, through which the melted melting material 200 flows down, and supports a lower end 200a of the melting material 200 at a position above a lower end 11b of the heating coil part 11. Further, the melting device 100 includes a guide part 30 which guides a melting material 201 (a second melting material) so that the melting material 201 is inserted into the heating coil part 11 in a state where the melting material 201 to be melted after the melting material 200 is melted is stacked on the melting material 200 so as to contact with the melting material 200.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a melting device, and more particularly, to a melting device having a heating coil unit into which a raw material for melting is inserted.

  2. Description of the Related Art Conventionally, a melting device including a heating coil unit into which a melting raw material is inserted is known (for example, see Patent Literature 1).

  Patent Document 1 discloses a melting apparatus including a melting furnace in which an aluminum ingot is inserted and melted. Specifically, the melting furnace includes a tubular furnace body made of a refractory material, and a cold material charging guide disposed above the furnace body. An induction coil for heating and melting the aluminum ingot inserted into the furnace body is provided on the outer peripheral side of the furnace body. Further, the cold material charging guide is provided to guide the aluminum ingot into the melting furnace (furnace body). In addition, an outlet for discharging the molten aluminum is provided at the bottom of the cylindrical melting furnace.

  Further, in the melting device, the ingot inside the furnace body is melted, so that when the upper end of the ingot reaches the center position in the center axis direction of the induction coil provided in the melting furnace, it is melted at present. An ingot of aluminum to be melted after the ingot is melted (hereinafter, the ingot to be melted next time) is inserted into the furnace through a cold material introduction guide. That is, the ingot to be melted next time is inserted after the currently melted ingot is melted and reduced to a predetermined size. As a result, the aluminum ingot to be melted next time is inserted into the furnace via the cold material charging guide and immediately inserted into the position where the melting efficiency is highest (the center position in the center axis direction of the induction coil). It is not disposed (held) in the cold material introduction guide in a cold state. As a result, even if the melted ingot does not flow out from the outlet due to the clogged outlet, and the melted ingot scatters in the furnace, the ingot to be melted next time is not cold (because it is heated), so it is melted next time. Even if the scattered ingot adheres to the ingot, the attached ingot is immediately dissolved.

JP 2819711 A

  However, in the melting apparatus described in Patent Document 1, since the ingot that is currently melted is melted and reduced to a predetermined size, the ingot to be melted next time is charged, so that the ingot to be melted next time is charged. At the moment, there is a disadvantage that the load of the induction heating by the induction coil (the size of the ingot to be heated) suddenly increases. For this reason, there is a problem that the control of the induction heating by the induction coil becomes unstable, and it becomes difficult to continuously and stably melt the ingot.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a currently dissolved material and a dissolved material that is dissolved after the currently dissolved material. Is to provide a dissolving apparatus capable of stably and continuously dissolving the

  In order to achieve the above object, a melting apparatus according to one aspect of the present invention includes a heating coil unit into which a first melting raw material is inserted, and a through hole through which the melted first melting raw material flows and falls, A support portion that supports the lower end of the first molten material from below at a position above the lower end of the heating coil portion, and the second molten material that is melted after the first molten material is melted contacts the first molten material. And a guide section for guiding the second melted raw material to be inserted into the heating coil section in the state of being stacked as described above.

  In the melting device according to one aspect of the present invention, as described above, the supporter supports the lower end of the first melted raw material from below at a position above the lower end of the heating coil unit. Thereby, since the lower end of the first melting raw material is arranged at a position higher than the lower end of the heating coil portion, the magnetic flux from the heating coil portion reaches the lower end of the first melting raw material and the portion near the lower end sufficiently. . As a result, the lower end of the first melted raw material and the portion near the lower end can be rapidly melted, so that clogging of the through hole due to the undissolved lower end of the first melted raw material can be suppressed. This allows the first dissolved raw material to flow out of the through-hole smoothly and suppresses the first dissolved raw material from scattering. As a result, it is possible to suppress the scattered first dissolved material from adhering to the second dissolved material. Here, when the second molten material is inserted into the heating coil portion in a state where the second molten material is stacked so as to contact the first molten material, the magnetic flux from the heating coil portion does not reach the second molten material, The second molten material may be in a cold state. However, even in this case, since the scattering of the first dissolved material is suppressed, the scattering of the first dissolved material is prevented from adhering to the second dissolved material, so that the movement of the second dissolved material is dispersed. (1) It can be prevented from being hindered by the dissolved raw material. Thereby, in order to make the second molten material heated when the second molten material is inserted, the second molten material is inserted after the first molten material is melted and reduced to a predetermined size. There is no need to control the timing like this. In other words, before the first molten material is melted and reduced to a predetermined size, the second molten material is stacked on the first molten material using the guide portion and inserted into the heating coil portion. Can be smoothly inserted into the heating coil section. As a result, the size of the object to be heated by the heating coil unit can be made substantially constant. Thereby, the load applied to the heating coil unit can be made substantially constant. As a result, the first dissolved raw material and the second dissolved raw material can be stably and continuously dissolved.

  In the melting device according to the one aspect, preferably, the heating coil portion is wound, and a melting furnace in which the first melting raw material is inserted and a guide portion is attached is further provided. The melting furnace and the support portion are separately provided from each other. Is provided. According to this structure, since the melting furnace and the support can be individually replaced, the replacement of the melting furnace and the support can be facilitated. In addition, since the size (height) of the support portion can be changed by replacing the support portion, the dissolution characteristics (dissolution rate and the like) of the first melting raw material can be easily adjusted.

  In this case, preferably, the support portion is provided so as to be surrounded by the inner peripheral surface of the melting furnace. With such a configuration, the movement of the support portion is restricted by the inner peripheral surface of the melting furnace, so that the position of the support portion can be suppressed from being shifted.

  In the dissolving apparatus according to the one aspect, preferably, each of the support portion and the guide portion is made of a non-magnetic material. According to this structure, the magnetic flux from the heating coil portion can be suppressed from being affected by the support portion and the guide portion, so that the first molten material can be stably melted by the heating coil portion. .

  In the melting apparatus according to the one aspect, preferably, further includes a high-frequency power supply that supplies power to the heating coil unit, and in a state where the power supplied to the heating coil unit from the high-frequency power supply is set to be substantially constant, It is configured to determine the melting time of the first melting raw material by the heating coil unit based on the relationship between the set melting amount of the first melting raw material and the supplied amount of power from the high frequency power supply. According to this structure, the required amount of the first dissolved raw material can be dissolved without detecting the dissolved amount by a weight sensor or the like. As a result, the number of parts for dissolving the first dissolving raw material can be reduced. Further, control for melting the first melting raw material can be simplified as compared with the case where the power of the high-frequency power supply is controlled (feedback control) based on the melting amount.

  Further, since the power supply amount from the high frequency power supply is substantially constant, the load of control for determining the melting time of the first melting raw material can be reduced as compared with the case where the power supply amount fluctuates. Further, the dissolution time can be calculated more accurately and promptly than when the user manually calculates (determines) the dissolution time.

  In the melting apparatus according to the one aspect, preferably, the support unit includes a raw material support surface that supports the lower end of the first molten raw material at a position above the lower end of the heating coil unit. , And is configured to support the central portion of the lower end of the first molten material. Here, when the first molten material is heated by the magnetic flux of the heating coil portion, the surface of the first molten material is mainly heated by the skin effect. As a result, melting starts from the outer surface of the first melting raw material, and the central portion of the melting raw material is melted at a relatively late stage. That is, the melting proceeds from the outer surface of the first melting raw material gradually toward the center. Further, since the magnetic flux is concentrated on the lower end (corner) of the first melting raw material, the progress of the melting on the lower end side is fast. As a result, the first molten material has a shape that tapers downward. Therefore, by configuring the raw material support surface portion to support the center of the lower end of the first molten raw material, the tapered tip (lower end) side of the first molten raw material can be supported in a stable state.

  In this case, preferably, a plurality of through holes are provided, and the raw material support surface portion is formed by a portion between the plurality of through holes in the support portion. With this configuration, a plurality of through holes are provided so as to be adjacent to the raw material support surface portion. Then, the first molten raw material dissolved from the first molten raw material flows toward the distal end side of the tapered first molten raw material (portion in contact with the raw material support surface portion). Further, it can be more smoothly dropped from the plurality of through holes adjacent to the raw material support surface portion.

  ADVANTAGE OF THE INVENTION According to this invention, the dissolved raw material currently melt | dissolved and the dissolved raw material melt | dissolved after the currently melt | dissolved raw material can be stably continuously melt | dissolved as mentioned above.

It is the schematic which showed the whole structure of the dissolution apparatus by 1st Embodiment. It is a perspective view of a support part of a melting device by a 1st and 2nd embodiment. It is a top view of the support part of the dissolution apparatus by 1st and 2nd embodiment. It is a side view of the support part of the dissolution apparatus by 1st and 2nd embodiment. It is a figure which shows the distribution of the magnetic flux density near the heating coil part calculated | required by the simulation (the state where the lower end of the heating coil part and the lower end of the melting raw material are substantially flush). It is a figure showing distribution of magnetic flux density near a heating coil part calculated by simulation (state where the lower end of a melting raw material is arranged above the lower end of a heating coil part). It is a figure which shows the distribution of Joule heat density near the heating coil part calculated | required by simulation. It is a figure for explaining the state where a melting raw material melts. It is a figure for explaining the relation between time and electric power when a plurality of melting materials are melted continuously. It is the schematic which showed the whole structure of the dissolution apparatus by 2nd Embodiment. It is the schematic which showed the whole structure of the melting device by the 1st modification of 1st and 2nd embodiment. It is a perspective view of a support part of a melting device by the 1st modification of a 1st and 2nd embodiment. It is a perspective view of a support part of a melting device by a 2nd modification of a 1st and 2nd embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
The configuration of the melting device 100 according to the first embodiment will be described with reference to FIGS.

(Configuration of melting device)
As shown in FIG. 1, the melting apparatus 100 includes a high-frequency power panel 1. The high-frequency power panel 1 is configured to supply high-frequency (for example, 10 kHz) AC power to a heating coil unit 11 described later. The high-frequency power supply panel 1 is an example of the “high-frequency power supply” in the claims. FIG. 1 is a schematic diagram, in which members unnecessary for description are omitted.

  The high-frequency power panel 1 is supplied with AC power from an AC power supply 101. The high-frequency power board 1 includes a rectifier 1a that converts AC power from the AC power supply 101 into DC power. Further, the high-frequency power panel 1 includes a smoothing unit 1b for smoothing the DC power converted by the rectifying unit 1a. Further, the high-frequency power supply panel 1 includes an inverter unit 1c that converts DC power smoothed by the smoothing unit 1b into AC power.

  Further, the melting device 100 is provided with a heating unit 10 in which a heating coil unit 11 described later is provided. The heating unit 10 is provided so as to be adjacent to the high-frequency power panel 1.

  The heating unit 10 of the melting apparatus 100 is provided with a heating coil unit 11 into which the melting raw material 200 is inserted. Note that the melting raw material 200 is made of a non-magnetic material. For example, the melting raw material 200 is made of aluminum, zinc, copper, or the like. In addition, the melting raw material 200 is configured as an ingot (a refined metal is made into one lump). The melting raw material 200 has a substantially prismatic shape (a substantially rectangular parallelepiped shape). The molten raw material 200 has a substantially rectangular shape when viewed from the direction in which the molten raw material 200 extends (Z direction). In addition, the melting raw material 200 is an example of the “first melting raw material” in the claims.

  The heating coil unit 11 is an induction heating type heating coil unit 11. That is, a magnetic flux (magnetic field) is generated from the heating coil unit 11 by the AC power supplied from the high-frequency power supply panel 1. Then, due to the magnetic flux, a high-density eddy current is generated (skin effect) near the surface of the melted raw material 200 inserted into the heating coil unit 11. Then, the surface of the melting raw material 200 is heated by the Joule heat of the eddy current.

  Further, the melting apparatus 100 includes a melting furnace 11 a provided in the heating unit 10. The heating coil part 11 is wound around the melting furnace 11a, and the melting raw material 200 is inserted therein.

  The melted raw material 200 that has dropped through the through-holes 22 described below is held in the holding furnace 102. When the high-frequency power supply panel 1 is turned on, the melting of the melted raw material 200 is started, and the melted raw material 200 is stored in the holding furnace 102. By turning off the high-frequency power supply panel 1 at the moment when the required amount of the melted raw material 200 is obtained, the melting of the melted raw material 200 is stopped.

  The melting device 100 includes a support portion 20 that is disposed below the heating coil portion 11 and that supports the lower end 200a of the melting raw material 200 from below. The support section 20 supports the lower end 200a of the molten raw material 200 from below at a position above the lower end 11b of the heating coil section 11. Specifically, the support portion 20 includes a raw material support surface portion 21 that supports the lower end 200a of the melted raw material 200 at a position above the lower end 11b of the heating coil portion 11 (on the Z1 side).

  Specifically, the raw material supporting surface portion 21 is disposed above the lower end 11b of the heating coil portion 11 by a length L12 of 18% or more of the length L11 of the heating coil portion 11 in the vertical direction. More preferably, the raw material supporting surface portion 21 is disposed above the lower end 11b of the heating coil portion 11 by a length L12 equal to or more than 25% of the length L11 of the heating coil portion 11. As a result, the lower end 200a of the melted raw material 200 is positioned by the raw material support surface 21, so that the lower end 200a of the melted raw material 200 is located at a position above the lower end 11b of the heating coil unit 11 by a distance L12.

  Here, in the first embodiment, the melting furnace 11a and the support portion 20 are provided separately from each other. Specifically, the support part 20 is inserted inside the melting furnace 11a. That is, the support portion 20 is provided so as to be surrounded by the inner peripheral surface 11c of the melting furnace 11a. More specifically, the entire support portion 20 is surrounded by an inner peripheral surface 11c near the lower end 11d of the melting furnace 11a.

  The melting device 100 includes a guide unit 30. The guide section 30 is attached to the melting furnace 11a. The guide part 30 is inserted into the heating coil part 11 (melting furnace 11a) in a state where the molten raw material 201, which is melted after the molten raw material 200 is melted, is stacked so as to contact the molten raw material 200. Guide you to Specifically, the guide portion 30 has a cylindrical shape. The movement (tilt) of the melted raw material 201 inserted into the guide portion 30 is regulated by the inner peripheral surface 31 of the guide portion 30 so as not to be inclined. Then, as the melting of the melting raw material 200 proceeds, the melting raw material 201 held vertically by the guide portion 30 is guided by the guide portion 30 so as to be inserted into the melting furnace 11a while being held vertically. . The molten raw material 201 is inserted into the melting furnace 11 a by the guide unit 30 while being placed on the upper end surface 200 b of the molten raw material 200. The melting raw material 201 is an example of the “second melting raw material” in the claims.

  The timing at which the melted raw material 201 is placed on the upper end surface 200b of the melted raw material 200 is such that the melting of the melted raw material 200 is not performed unless the load on the heating coil unit 11 fluctuates rapidly with the placement of the melted raw material 201. It may be before starting or after starting. Thereby, the melting raw material 200 and the melting raw material 201 can be continuously melted while suppressing the fluctuation of the load applied to the heating coil unit 11. In addition, the control load can be reduced by complicated control as compared with the case where the timing of feeding the melted raw material 201 is adjusted.

  Further, each of the support portion 20 and the guide portion 30 is made of a non-magnetic material. Specifically, the support portion 20 and the guide portion 30 are formed of a non-magnetic material and a material that is not induction-heated by the heating coil portion 11. For example, the support portion 20 and the guide portion 30 are made of fire brick, heat resistant resin, ceramic, or the like. Note that the guide portion 30 is desirably formed of a material having high mechanical strength and high heat resistance as compared with the melted raw material 200 (201).

  As shown in FIGS. 2 to 4, the support portion 20 has a shape (substantially rectangular parallelepiped) along the shape of the melted raw material 200.

  In the first embodiment, as shown in FIG. 2, the raw material supporting surface 21 is configured to support the central portion C (see FIG. 8) of the lower end 200 a of the molten raw material 200 in a plan view. Specifically, in the vicinity of the raw material support surface portion 21 of the support portion 20, a through hole 22 through which the melted raw material 200 flows and falls is provided. The through hole 22 extends in the vertical direction (Z direction). Further, a plurality of (two in the first embodiment) through holes 22 are provided. The raw material support surface portion 21 is configured by a portion between the plurality of (two) through holes 22 in the support portion 20 (a portion between the through hole 22a and the through hole 22b). Specifically, the melted raw material 200 before being melted is supported by a portion other than the through hole 22 on the upper surface of the support portion 20. In addition, as the dissolution of the dissolving raw material 200 proceeds, the dissolving raw material 200 becomes tapered downward (see FIG. 8). Then, the distal end side of the melted raw material 200 in the tapered state is supported by the raw material support surface portion 21 formed by a portion between the plurality of (two) through holes 22.

  Further, as shown in FIG. 3, the through hole 22 has a substantially circular shape in a plan view. The diameter r of the through hole 22 is larger than the width W of the raw material support surface 21 in the direction (X direction) in which the plurality of through holes 22 are adjacent. The two through holes 22 have the same shape (the same diameter). And, for example, the diameter r is at least twice the width W. The diameter r of the through-hole 22 is adjusted so that the dissolved raw material 200 can be smoothly dropped downward through the through-hole 22. The width W is adjusted so that the tapered molten material 200 (see FIG. 7) is stably supported.

  In addition, as shown in FIG. 4, the length L <b> 21 of a portion of the support portion 20 arranged inside the heating coil portion 11 is larger than the length L <b> 22 of a portion arranged outside the heating coil portion 11. . The length L21 is adjusted depending on where the raw material support surface portion 21 is disposed inside the heating coil portion 11. Therefore, the length L21 may be smaller than the length L22. In addition, the length L21 of the portion disposed inside the heating coil unit 11 is adjusted to an optimum length according to the type of the melting raw material 200.

(Analysis of magnetic flux density and Joule heat density)
Next, analysis (simulation) of the magnetic flux density and Joule heat density generated from the heating coil unit 11 will be described.

  First, as shown in FIG. 5, a case where the height position of the lower end 200a of the molten raw material 200 and the height position of the lower end 11b of the heating coil unit 11 are the same (substantially flush) will be described. In this case, the magnetic flux density (magnetic field) near the lower end 200a of the molten raw material 200 was relatively low, and it was confirmed that the molten raw material 200 could not be sufficiently melted. It is considered that the reason is that the magnetism is interrupted by the side surface 200c of the molten raw material 200, and the magnetic flux does not sufficiently reach the corner 200d of the lower end 200a of the molten raw material 200. That is, since no edge effect occurs at the corner 200d, the magnetic flux does not concentrate. Therefore, it is considered that the dissolved raw material 200 is not sufficiently dissolved and remains as a solid.

  On the other hand, as shown in FIG. 6, when the lower end 200 a of the melted raw material 200 is disposed above the lower end 11 b of the heating coil unit 11 by about 18% to 25% of the length of the heating coil unit 11. It was confirmed that the magnetic flux density at the lower end 200a of the molten raw material 200 was relatively high. As a result, the magnetic flux sufficiently reaches the corner 200d of the lower end 200a of the molten raw material 200, so that an edge effect occurs at the corner 200d. As a result, it was confirmed that since the magnetic flux was concentrated on the corner 200d, all of the melting raw material 200 could be melted.

  Further, as shown in FIG. 7, since the magnetic flux is concentrated on the corner 200d, it has been confirmed that the Joule heat density (temperature) at the corner 200d is relatively high. FIG. 7 shows a simulation result in a state where the melted raw material 200 is divided into quarters and the shape of the melted raw material 200 is tapered. From FIG. 7, it has been confirmed that the Joule heat density (temperature) increases as the distance between the molten raw material 200 and the heating coil unit 11 decreases. In addition, in the tapered shape of the molten raw material 200, it was confirmed that the distance between the front end portion (the corner portion 200d) and the heating coil portion 11 was large, while the Joule heat density (temperature) was increased by the edge effect. Thereby, it was confirmed that the melting raw material 200 was dissolved from the corner 200d of the melting raw material 200.

(Experiment on the location of the raw material support surface)
Next, a description will be given of an experiment performed to confirm the melting state of the melted raw material 200 with respect to the arrangement position of the raw material support surface section 21 inside the heating coil section 11.

  The lower end 11b of the heating coil portion 11 is formed by adjusting the raw material supporting surface portion 21 by less than 18% (0%, 5%, 10%, 15%, etc.) of the length L11 (see FIG. 1) of the heating coil portion 11 in the vertical direction. When it was arranged at a position higher than the above, it was confirmed that the dissolved raw material 200 could not be sufficiently dissolved and the solid dissolved raw material 200 remained. On the other hand, when the raw material supporting surface portion 21 is arranged at a position 18% or more of the length L11 of the heating coil portion 11 in the vertical direction and above the lower end 11b of the heating coil portion 11, the molten raw material 200 can be sufficiently melted. confirmed.

(Experiment on continuous dissolution of dissolved raw materials)
FIG. 9 illustrates an experiment performed to confirm a fluctuation in electric power when seven melting raw materials 200 are continuously melted.

  As shown in FIG. 9, when the melting raw material 200 to be melted was switched, a slight power fluctuation was observed, but thereafter, it was confirmed that the power was stably controlled. In particular, it was confirmed that the electric power was more stably controlled in the third and subsequent melted raw materials 200. As a reason, it is conceivable that the electric elements and the like included in the melting apparatus 100 start to be thermally stabilized around the time when the melting of the third melting raw material 200 is started.

  In addition, it was confirmed that the dissolving time required for dissolving one of the dissolving raw materials 200 was substantially the same in all of the seven dissolving raw materials 200. Further, it was confirmed that the power increased relatively quickly after the high-frequency power supply panel 1 was operated, and that the melting of the first melting raw material 200 was started relatively quickly. In addition, it was confirmed that the power dropped relatively quickly after the high-frequency power supply panel 1 was stopped, and that the melting of the seventh melting raw material 200 was completed relatively quickly.

  By operating the high-frequency power supply panel 1 at an arbitrary timing to start dissolution of the melted raw material 200, and by immediately stopping the high-frequency power supply board 1 when a required amount of the melted raw material 200 is obtained, It becomes easy to dissolve the dissolving raw material 200 by a necessary amount when necessary and to take it out of the dissolving apparatus 100. As a result, there is no need to hold and keep a large amount of the melted raw material 200 in the holding furnace 102. Thereby, it is possible to make the size of the holding furnace 102 relatively small. Further, it is possible to directly supply the melted raw material 200 melted from the melting apparatus 100 to a die casting machine (not shown) without providing the holding furnace 102.

(Operation of melting device)
Next, the operation of the melting apparatus 100 will be described.

  First, a breaker (not shown) of the high-frequency power panel 1 (see FIG. 1) is turned on. Thereby, preparation for operation is performed. Then, by operating an operation unit (not shown) provided on the high-frequency power supply panel 1, heating by the heating coil unit 11 is started.

  Then, as shown in FIG. 8A, the dissolution starts from the outer surface of the dissolving raw material 200 due to the skin effect. The melted raw material 200 falls downward (outside the heating coil unit 11) via the through hole 22 of the support unit 20. Also, due to the skin effect, the central portion C of the dissolved raw material 200 is more slowly dissolved than the outer surface of the dissolved raw material 200. As a result, as the dissolution of the dissolving raw material 200 proceeds, the dissolving raw material 200 has a shape in which the lower side of the dissolving raw material 200 tapers. The distal end of the tapered molten material 200 is supported by the raw material support surface 21.

  As the melting further proceeds, the magnetic flux concentrates on the tip of the tapered melting raw material 200 due to the edge effect (see FIG. 7). As a result, the tip of the melting raw material 200 is melted. As a result, as shown in FIG. 8 (b), the dissolved raw material 200 descends due to its own weight. Since the melted raw material 200 that has fallen is supported by the raw material support surface portion 21 of the support section 20, the lowering of the melted raw material 200 stops. Then, by continuing to supply the high-frequency current to the heating coil unit 11, the state shown in FIG. 8A and the state shown in FIG. 8B are alternately repeated. Thereby, the melting raw material 200 is continuously melted.

  Here, when the supply of the high-frequency current to the heating coil unit 11 is stopped, the heating of the molten raw material 200 is immediately stopped (within several seconds). Thus, the descent of the dissolved raw material 200 is instantaneously stopped. Further, when the supply of the high-frequency current to the heating coil unit 11 is resumed in a state where the molten raw material 200 is at a relatively high temperature, melting is started immediately, and the melted molten raw material 200 is dropped again. As described above, by controlling the supply time of the high-frequency current to the heating coil unit 11, the amount of the dissolved raw material 200 to be dissolved can be controlled.

  Also, unlike the first embodiment, when the melted raw material 200 is melted by directly applying a flame of a burner to the melted raw material 200, the gas (oxygen, hydrogen) contained in the flame causes the melted raw material 200 to be oxidized. (Oxidation loss). For this reason, the yield of dissolution deteriorates. In addition, energy for maintaining the molten raw material 200 (molten metal) in a liquid state is required separately, and personnel for monitoring the state of the molten metal are also required. Therefore, in the first embodiment, the melting raw material 200 is not oxidized by melting the melting raw material 200 by the heating coil unit 11 to which the high-frequency current is supplied, so that the melting yield is improved (the quality is maintained). ) Is possible. Further, it is possible to reduce energy for maintaining the molten metal in a liquid state.

  Also, unlike the first embodiment, when the melting raw material 200 is melted by directly applying the burner flame to the crucible containing the melting raw material 200, the flame of the burner can be uniformly heated on the surface of the crucible. Have difficulty. As a result, the temperature distribution of the crucible is biased. As a result, since the crucible is partially worn, maintenance of the crucible is required. Further, since the melted raw material 200 is indirectly heated via the crucible, the consumption of gas, petroleum, etc., which is the raw material of the burner flame, increases. Therefore, in the first embodiment, since the melting raw material 200 can be directly heated by melting the melting raw material 200 by the heating coil unit 11 to which the high-frequency current is supplied, an increase in energy consumption is suppressed. It becomes possible to do.

[Effects of First Embodiment]
In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the through hole 22 through which the melted molten raw material 200 flows and falls is provided, and the lower end 200 a of the molten raw material 200 is positioned lower than the lower end 11 b of the heating coil unit 11. And a guide unit 30 that guides the molten raw material 201 to be inserted into the heating coil unit 11 in a state where the molten raw material 201 is stacked so as to be in contact with the molten raw material 200. Next, the melting apparatus 100 is configured. As a result, the lower end 200a of the molten raw material 200 is disposed at a position higher than the lower end 11b of the heating coil unit 11, so that the magnetic flux from the heating coil unit 11 is applied to the lower end 200a of the molten raw material 200 and a portion near the lower end 200a. Reach enough. As a result, the lower end 200a of the melted raw material 200 and the portion near the lower end 200a can be rapidly melted, so that the clogging of the through hole 22 due to the undissolved lower end 200a of the melted raw material 200 can be suppressed. Thereby, the melted raw material 200 can be smoothly flowed out from the through-hole 22 and the scattering of the melted raw material 200 can be suppressed. As a result, the scattering of the dissolved raw material 200 can be suppressed from adhering to the dissolved raw material 201. Here, when the molten raw material 201 is inserted into the heating coil unit 11 in a state where the molten raw material 201 is stacked so as to be in contact with the molten raw material 200, the magnetic flux from the heating coil unit 11 does not reach the molten raw material 201, 201 may be in a cold state. However, even in this case, since the scattering of the dissolved raw material 200 is suppressed, the scattering of the dissolved raw material 200 is suppressed from adhering to the dissolved raw material 201. The hindrance can be suppressed. Accordingly, in order to bring the molten raw material 201 into a heated state when the molten raw material 201 is inserted, a timing is set such that the molten raw material 200 is melted and reduced to a predetermined size before the molten raw material 201 is inserted. No need to control. That is, even before the molten raw material 200 is melted and reduced to a predetermined size, the molten raw material 201 is smoothly stacked even when the molten raw material 201 is laminated on the molten raw material 200 using the guide unit 30 and inserted into the heating coil unit 11. Can be inserted into the heating coil unit 11. As a result, the size of the object to be heated by the heating coil unit 11 can be made substantially constant. Thereby, the load applied to the heating coil unit 11 can be made substantially constant. As a result, the dissolving raw material 200 and the dissolving raw material 201 can be stably and continuously dissolved.

  Further, in the first embodiment, as described above, the melting apparatus 100 is configured such that the melting furnace 11a and the support unit 20 are provided separately from each other. Thereby, since each of the melting furnace 11a and the support unit 20 can be individually replaced, maintenance of each of the melting furnace 11a and the support unit 20 can be facilitated. In addition, since the size (height) of the support portion 20 can be changed by replacing the support portion 20, it is possible to easily adjust the dissolution characteristics (dissolution rate and the like) of the melting raw material 200.

  In the first embodiment, as described above, the melting apparatus 100 is configured such that the support portion 20 is provided so as to be surrounded by the inner peripheral surface 11c of the melting furnace 11a. Thereby, since the movement of the support part 20 is regulated by the inner peripheral surface 11c of the melting furnace 11a, the displacement of the support part 20 can be suppressed.

  Further, in the first embodiment, as described above, the melting device 100 is configured such that each of the support portion 20 and the guide portion 30 is made of a non-magnetic material and a material that is not induction-heated by the heating coil portion 11. Is configured. Thereby, the magnetic flux from the heating coil unit 11 can be suppressed from being affected by the support unit 20 and the guide unit 30, so that the melting raw material 200 can be stably melted by the heating coil unit 11.

  Further, in the first embodiment, as described above, the melting apparatus 100 is configured such that the raw material supporting surface portion 21 supports the central portion C of the lower end 200a of the molten raw material 200 in plan view. Here, when the melting raw material 200 is heated by the magnetic flux of the heating coil unit 11, the surface of the melting raw material 200 is mainly heated by a skin effect. As a result, melting starts from the outer surface of the melted raw material 200, and the central portion C of the melted raw material 200 is melted at a relatively late stage. That is, the melting proceeds gradually from the outer surface of the melting raw material 200 toward the center. Further, since the magnetic flux is concentrated on the lower end 200a (corner 200d) of the molten raw material 200, the progress of the melting on the lower end 200a side is fast. As a result, the molten raw material 200 has a shape that tapers downward. Therefore, by configuring the raw material support surface portion 21 to support the central portion C of the lower end 200a of the molten raw material 200, the tapered tip (lower end 200a) side of the molten raw material 200 can be supported in a stable state. .

  Further, in the first embodiment, as described above, the melting apparatus 100 is configured such that the raw material support surface portion 21 is configured by a portion between the plurality of through holes 22 in the support portion 20. Thereby, a plurality of through holes 22 are provided so as to be adjacent to the raw material support surface portion 21. The melted raw material 200 melted from the melted raw material 200 flows toward the distal end of the tapered shape of the melted raw material 200 (the portion in contact with the raw material support surface portion 21). It can be more smoothly dropped from the plurality of through holes 22 adjacent to the surface portion 21.

[Second embodiment]
Next, a configuration of a melting apparatus 300 according to the second embodiment will be described with reference to FIG. The melting apparatus 300 of the second embodiment is different from the first embodiment in which the high-frequency power panel 1 is manually turned on and off, and the on-off of the high-frequency power panel 1 is automated. The same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and are not described.

  As shown in FIG. 10, the melting device 300 includes a control device 40 that controls the operation of the high-frequency power supply panel 1.

(Determination of dissolution time of dissolving raw material)
Next, control when determining the melting time T of the melting raw material 200 will be described.

  In the second embodiment, the melting device 100 (the control device 40) sets a predetermined amount of the melting raw material 200 in a state where the power supplied from the high-frequency power panel 1 to the heating coil unit 11 is set to be substantially constant. The melting time T of the melting raw material 200 by the heating coil unit 11 is determined based on the relationship between the heating coil unit 11 and the supply amount of power from the high-frequency power supply panel 1.

More specifically, the melting time T (s) is determined by setting a predetermined amount of the dissolved raw material 200 to be dissolved (A (kg)) and a dissolution rate determined by the amount of electric power supplied from the high-frequency power board 1 to B (kg / When s) is set, it is calculated by the following equation (1).

  Then, the dissolution of the dissolving raw material 200 is automatically executed (feed forward control) for the calculated dissolution time T. Specifically, the dissolution start time t1 is programmed in advance, and the dissolution is automatically stopped at a time t2 (t1 + T) after the dissolution time T from the dissolution start time t1.

  The other configuration of the second embodiment is the same as that of the first embodiment.

(Effect of Second Embodiment)
In the second embodiment, the following effects can be obtained.

  In the second embodiment, as described above, with the electric power supplied from the high-frequency power supply panel 1 to the heating coil unit 11 set to be substantially constant, the predetermined amount of the dissolved raw material 200 and the high-frequency power supply The melting apparatus 100 is configured to determine the melting time T of the melting raw material 200 by the heating coil unit 11 based on the relationship with the amount of power supplied from the heating coil unit 11. Thus, the required amount of the dissolving raw material 200 can be dissolved without detecting the dissolving amount by a weight sensor or the like. As a result, it is possible to reduce the number of parts for melting the melting raw material 200. Further, control for melting the melting raw material 200 can be simplified as compared with the case where the power of the high-frequency power supply panel 1 is controlled (feedback control) based on the melting amount.

  Further, since the power supply amount from the high frequency power supply panel 1 is substantially constant, the control load for determining the melting time T of the melting raw material 200 can be reduced as compared with the case where the power supply amount fluctuates. . Further, the dissolution time T can be calculated more accurately and quickly than when the user manually calculates (determines) the dissolution time T.

  The other effects of the second embodiment are the same as those of the first embodiment.

[Modification]
It should be understood that the embodiments disclosed this time are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description of the embodiments, and includes all equivalents (modifications) within the scope and meaning equivalent to the claims.

  Further, in the first and second embodiments, the example in which the support portion 20 has the two through holes 22 has been described, but the present invention is not limited to this. The support portion 20 may be provided with one through hole 22 or three or more through holes.

  For example, as shown in FIGS. 11 and 12, the melting device 400 includes a support 120 having one through-hole 122. In this case, the dissolved raw material 200 is supported by the raw material support surface 121 near the through hole 122 (see FIG. 12).

  Further, a columnar portion may be provided near the center of one through hole. More specifically, as shown in FIG. 13, the support 220 includes a through hole 222 and a column 223. The columnar portion 223 is provided near the center of the through hole 222. The columnar portion 223 has a raw material support surface 221 that supports the lower end 200a (see FIG. 1) of the molten raw material 200. Further, the columnar portion 223 is connected to the inner peripheral surface 222a of the through hole 222 by a pair of beam portions 224.

  Further, in the first and second embodiments, the example in which the guide portion 30 has a cylindrical shape has been described, but the present invention is not limited to this. As long as the molten raw material 201 (second molten raw material) is stacked so as to contact the molten raw material 200 (first molten raw material), the guide portion 30 may have a shape other than the cylindrical shape.

  Further, in the first and second embodiments, the example in which the support portion 20 is made of the refractory brick has been described, but the present invention is not limited to this. For example, the support portion 20 may be made of ceramics.

  Further, in the second embodiment, the example in which the melting of the melting raw material 200 (first melting raw material) is automatically executed (feed forward control) for the calculated melting time T has been described. Not limited to For example, the dissolution time T may be configured to be set manually.

  Further, in the first and second embodiments, an example is shown in which the melting apparatus of the present invention is used for melting the melting raw material 200 (first melting raw material), but the present invention is not limited to this. For example, by making the supply amount of the high-frequency current relatively small, the melting device of the present invention can be used as a preheating device for removing water and oil adhering to the surface of the melting material 200 (first melting material) or a heating device for a material such as aluminum. It is possible to use the device.

  Further, in the first and second embodiments, the example in which the melting raw material 200 (the first melting raw material) has a substantially rectangular parallelepiped shape (a prismatic shape) has been described, but the present invention is not limited to this. For example, the melting raw material 200 (first melting raw material) may have a substantially cylindrical shape. In this case, the heating coil portion 11 and the melting raw material 201 (second melting raw material) are also formed to have a substantially circular shape in plan view so as to follow the substantially cylindrical melting raw material 200 (first melting raw material). You.

  Further, in the first and second embodiments, the example in which the through hole 22 provided in the support portion 20 has a substantially circular shape has been described, but the present invention is not limited to this. For example, the through hole provided in the support may have a square shape.

1 High frequency power panel (high frequency power supply)
DESCRIPTION OF SYMBOLS 11 Heating coil part 11a Melting furnace 11b Lower end 11c Inner peripheral surface 20 Support part 21, 221 Raw material support surface part 22, 122, 222 Through hole 30 Guide part 100 Melting device 200 Melting raw material (1st melting raw material)
200a Lower end 201 Dissolving raw material (second dissolving raw material)
C Central part T Dissolution time

Japanese Patent No. 2819711

Claims (7)

A heating coil part into which the first melting raw material is inserted;
A supporting portion that includes a through hole through which the first molten material that has been melted flows and falls, and that supports the lower end of the first molten material from below at a position above the lower end of the heating coil portion;
The second molten material is inserted into the heating coil unit in a state where the second molten material that is dissolved after the first molten material is melted is stacked so as to contact the first molten material. A dissolving device, comprising: a guide portion for guiding. The heating coil unit is wound, and further includes a melting furnace to which the first melting raw material is inserted and the guide unit is attached.
The melting apparatus according to claim 1, wherein the melting furnace and the support are provided separately from each other.   The melting device according to claim 2, wherein the support portion is provided so as to be surrounded by an inner peripheral surface of the melting furnace.   The melting device according to any one of claims 1 to 3, wherein each of the support portion and the guide portion is made of a non-magnetic material. Further comprising a high-frequency power supply for supplying power to the heating coil unit,
In a state where the power supplied from the high-frequency power supply to the heating coil unit is set to be substantially constant, based on a relationship between a predetermined amount of the first melting raw material dissolved and a supply amount of the power from the high-frequency power supply. The melting apparatus according to any one of claims 1 to 4, wherein the melting time of the first melting raw material by the heating coil unit is determined. The support unit includes a raw material support surface that supports a lower end of the first molten raw material at a position above a lower end of the heating coil unit,
The melting device according to any one of claims 1 to 5, wherein the raw material supporting surface portion is configured to support a central portion of a lower end of the first molten raw material in a plan view. The through-hole is provided in plurality,
The dissolving apparatus according to claim 6, wherein the raw material support surface portion is configured by a portion between the plurality of through holes in the support portion.

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