JP2018100813A - Plasma melting system and plasma melting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma melting system and a plasma melting method which can supply melting liquid efficiently and quickly, can suppress waste of energy, and can improve quality of the melting liquid.SOLUTION: In a plasma melting system 10, a melting furnace 11 is composed of a melting tank 15 positioned at an upper part and a temperature control tank 16 positioned at a lower part. The melting tank 15 is movable to a melting position and a non-melting position. The temperature control tank 16 is movable to a melting liquid reception position and a melting liquid non-reception position. Melting liquid 14 melted by the melting tank 15 at the melting position is received by the temperature control tank 16 at the melting liquid reception position. Preparatory operation for melting in the melting tank 15 at the non-melting position is performed, and preparatory operation for receiving the melting liquid 14 in the temperature control tank 16 at the melting liquid non-reception position is performed.SELECTED DRAWING: Figure 1

Description

  The present invention is a system for plasma-melting a metal material (melted material) such as aluminum or zinc using a plasma torch, which can efficiently and rapidly supply plasma-melted melt. The present invention relates to a melting system and a plasma melting method.

  In general, a plasma melting apparatus includes a melting tank for storing a material to be melted and a plasma torch, and forms a melt (melt) by irradiating the material to be melted with plasma generated by the plasma torch. In this case, a solid melt and a liquid melt are mixed in the melting tank. Then, since solidification of the plasma-melted molten liquid damages the melting tank, in order to prevent the molten liquid from solidifying, for example, heating at 600 ° C. or higher is continued as a temperature for melting aluminum that is to be melted. Must.

  This type of plasma melting furnace is disclosed in Patent Document 1, for example. This plasma melting furnace is a melting furnace in which waste is melted at high temperature by arc plasma to form slag. The slag tank is partitioned into a main tank and a sub tank by a partition wall, and a communication path that connects the main tank and the sub tank is provided in the partition wall. The main tank is provided with a plasma torch and a waste inlet, and the sub tank is provided with a slag outlet for discharging slag melted by overflow. Further, the communication path is provided lower than the slag discharge port.

  Further, Patent Literature 2 discloses a plasma melting apparatus for supplying a molten metal such as aluminum to a die casting machine. This plasma melting apparatus includes a plurality of crucibles, a moving mechanism that moves the plurality of crucibles to a melting position and a non-melting position, and a plasma torch that melts a material to be dissolved at the melting position. Specifically, they are configured to be rotatable using three or four crucibles, melt the material to be melted at the melting position, remove the metal oxide at the non-melting position, discharge the molten metal, An operation such as charging is performed.

JP 2008-249220 A Japanese Patent Laying-Open No. 2015-68576

  In the plasma melting furnace of the conventional configuration described in Patent Document 1 described above, solid waste and liquid slag are mixed in the main tank, and a part of the slag is sub-tank through the communication path. To be guided to. Therefore, in the main tank, in order to keep the molten slag in a liquid state, it must be maintained at a high temperature at which the waste in the main tank is melted by arc plasma. Energy is wasted due to continued heating.

  In addition, most of the liquid slag is present in the main tank together with the solid waste, and a part of the liquid slag is configured to flow sequentially from the main tank to the sub tank via the communication path. There was a problem that liquid slag present in the main tank was exposed to an overheated state, resulting in alteration of the slag.

  Moreover, in the plasma melting apparatus of the conventional configuration described in Patent Document 2, since the melting operation of the object to be melted and the other operations are performed in one series (one stage), the melting position after the discharge of the molten metal is completed. It is necessary to carry out plasma melting with a crucible or to perform plasma melting and wait in that state before the discharge of the molten metal is completed. For this reason, there has been a problem that the supply of the molten metal to the die casting machine or the like is delayed and the production speed is slowed down.

  Accordingly, an object of the present invention is to provide a plasma melting system and a plasma that can supply the melt efficiently and quickly, can suppress energy waste, and can improve the quality of the melt. It is to provide a melting method.

  In order to achieve the above object, a plasma melting system of the present invention is a plasma melting system that melts a material to be melted in a melting furnace by a plasma torch, and is based on the plasma torch located in the upper part. A melting tank for preparing a melt by melting a material to be melted by plasma, and a temperature control tank for receiving the melt and holding it in a liquid state at a lower part, the melt tank being a melting position The temperature control tank is configured to be movable between a melt receiving position and a melt non-receiving position, and the melt melted in the melt tank at the melting position is melted into the melt. It is configured to receive in the temperature control tank at the receiving position, perform a preparatory operation for melting in the melting tank in the non-melting position, and perform a preparatory operation for receiving melt in the temperature control tank in the non-melt receiving position. .

  In the plasma melting method, the melted material is melted in the melting tank at the melting position, the prepared melt is received in the temperature control tank at the melt receiving position, and then melted in the melting tank at the non-melting position. The preparatory operation for accepting the melt is performed in the temperature control tank at the melt non-accepting position.

  According to the plasma melting system of the present invention, it is possible to supply the melt efficiently and quickly, to suppress the waste of energy, and to improve the quality of the melt.

Sectional drawing which shows the main structures of the plasma melting system in embodiment. Explanatory drawing which shows rotation operation | movement of the melting tank in a plasma melting system. Explanatory drawing which shows rotation operation | movement of the temperature control tank in a plasma melting system. (A) is a top view which shows the rotation mechanism of a temperature control tank, (b) is sectional drawing which shows the rotation mechanism of a temperature control tank, (c) is a front sectional view which shows the state which accommodates a temperature control tank in a saucer. (A) is explanatory drawing which shows the operation time at the time of implementing operation of a melting tank and operation of a temperature control tank in 1 series, (b) is parallel operation of a melting tank and operation of a temperature control tank in 2 lines. Explanatory drawing which shows the operation time at the time of implementing. (A) is a top view which shows an electrode, (b) is sectional drawing in the 6b-6b line | wire of (a). (A) is sectional drawing which shows a support rod, (b) is a side view which shows a support rod. The perspective view which shows the up-down operation | movement and turning operation | movement of a plasma torch. Explanatory drawing which shows the state which removes the slag adhering to the internal peripheral surface and supporting rod of the surrounding wall of a melting tank with an air blower. Explanatory drawing which shows the state which removes the slag adhering to the internal peripheral surface of a temperature control tank with an air blower. (A) is a top view which shows the rotation operation and preheating mechanism of a melting tank as another example, (b) is a schematic front view of (a).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a melting furnace 11 constituting a plasma melting system 10 is located at an upper part, and a melting tank 15 for preparing a melt 14 by melting a material 13 to be melted by plasma based on a plasma torch 12. And a temperature control tank 16 which is located in the lower part and holds the molten liquid 14 in a liquid state. The melt 13 is formed in a substantially cylindrical shape with a metal such as aluminum, zinc, or copper.

  The melting tank 15 includes a peripheral wall 17 formed in a cylindrical shape from a refractory material, and a bottom wall 21 including an electrode 18, an insulator 19, and a bottom plate 20 disposed at the lower end thereof. The electrode 18, the insulator 19 and the bottom plate 20 are integrally connected by a clamp (not shown). The temperature control tank 16 is made of a refractory material. The temperature control tank 16 is supported on a rectangular frame-shaped base 22. The electrode 18, the insulator 19 and the bottom plate 20 constituting the bottom wall 21 of the melting tank 15 are provided with communication holes 18 a, 19 a and 20 a having the same diameter as the inner diameter of the peripheral wall 17. The melt 14 is guided to the temperature control tank 16. The communication holes 18 a, 19 a, and 20 a are preferably designed so that the hole diameter is equal to or larger than the diameter of the material 13 to be melted, in order to smoothly guide the molten liquid 14 from the melting tank 15 to the temperature control tank 16.

  The plasma torch 12 is suspended and supported by a suspended body 23 at an upper position of the melting tank 15, and a movable member 24 movable by a driving device (not shown) is connected to be movable in the vertical direction, the horizontal direction, and the front-rear direction. It is configured.

  For example, as shown in FIG. 8, the plasma torch 12 can move in the vertical direction and the horizontal direction as indicated by arrows in FIG. 8, and swirls in a spiral shape. The plasma torch 12 can melt the entire melt 13 by irradiating the unmelted portion of the melt 13 with plasma.

  As shown in FIG. 1, the electrode 18 is formed of a conductive material such as carbon, and is disposed between the peripheral wall 17 of the melting tank 15 and the insulator 19, and between the electrode 18 and the plasma torch 12. A DC power supply 25 is connected via a connection line 26. A predetermined voltage is applied between the plasma torch 12 and the electrode 18 to irradiate the melt 13 with plasma.

  As shown in FIGS. 6 (a) and 6 (b), the electrode 18 is formed in a plate shape, and the electrode portion 27 has an annular shape, and a part of the conductive connection portion has a rectangular shape. 28 is extended. A pair of notches 29 facing each other are formed in the inner peripheral portion of the electrode portion 27 so as to be recessed.

  As shown in FIG. 1, support rods 30 as a pair of support portions for supporting the object to be melted 13 are installed on the peripheral edge portion of the communication hole 18 a of the electrode 18 constituting the bottom wall 21 of the melting tank 15. . As shown in FIGS. 7A and 7B, these support rods 30 are formed in a columnar shape, and are engaged with the notch portions 29 of the electrodes 18 on the lower surfaces of both end portions of each support rod 30. A concave locking portion 31 is provided, and the support rod 30 is disposed in a stable state with respect to the electrode 18 in the communication hole 18a. The melt 13 is supported on the pair of support bars 30. It is sufficient that a plurality of support rods 30 are arranged, and three or more support rods 30 may be provided. Further, the support rod 30 may be a flat surface formed on the upper surface or a triangular prism shape and disposed so that the side surface is the upper surface.

  The support rod 30 is made of a conductive material such as carbon, and is configured to function also as an electrode for generating plasma by the plasma torch 12. For this reason, plasma can be effectively irradiated to the to-be-melted material 13 with a pair of support rod 30 arrange | positioned directly under the to-be-melted material 13, and melting of the to-be-melted material 13 can be advanced rapidly.

  The temperature control tank 16 is provided with a high frequency induction heater 34 as a heater for raising the temperature of the melt 14 melted in the melt tank 15 by 30 to 150 ° C., and the melt 14 in the temperature control tank 16 is supplied to the temperature control tank 16. It is designed to be held in liquid form. The high-frequency induction heater 34 is disposed at a position below the temperature control tank 16, and heats the temperature control tank 16 with electric power from an AC power supply 35. As the heater, in addition to the high-frequency induction heater 34, a direct current heater, an electric heater heater, a gas combustion heater, or the like is used.

  As shown in FIGS. 9 and 10, the melting tank 15 and the temperature control tank 16 are provided with an air blowing device 40 for removing slag. As shown in FIG. 9, air is blown from above to the inner surface of the peripheral wall 17 of the melting tank 15 from the air nozzle 43 at the tip of the air hose 41 constituting the air blowing device 40, and the slag adhering to the inner surface of the peripheral wall 17 is removed. . Further, air is also blown to the pair of support rods 30 straddling the communication hole 18a of the electrode 18, and the slag adhering to the support rods 30 is removed.

  As shown in FIG. 10, the temperature adjustment tank 16 is supported upside down, and air is blown into the temperature adjustment tank 16 from the air nozzle 43 disposed below and attached to the inner surface of the temperature adjustment tank 16. Slag is removed.

Next, a specific configuration of the plasma melting system 10 will be described.
In the plasma melting system 10 of this embodiment, the melting tank 15 and the temperature control tank 16 rotate in two series (two stages), and each operation is performed in parallel.

  As shown in FIG. 2, the melting tank 15 is rotated counterclockwise in FIG. Arranged at intervals of 90 °. In the melting position 101, the melt 13 is plasma-melted in the melting tank 15, and the melt 14 is prepared. At the slag removal position 102, the slag is removed by the air ejected from the air nozzle 43 of the air blowing device 40 in the melting tank 15. At the electrode exchange position 103, the electrode 18 and the support rod 30 are exchanged. At the melt installation position 104, the melt 13 is inserted and installed in the melting tank 15.

  As shown in FIG. 3, the temperature adjustment tank 16 is rotated clockwise by the lower table 46 in FIG. 3, and is 90 ° in the circumferential direction at the melt receiving position 105, temperature adjustment position 106, tapping position 107 and slag removal position 108. ° Arranged at intervals. At the melt receiving position 105, the melt 14 is received by the temperature control tank 16 from the communication holes 18 a, 19 a, 20 a of the bottom wall 21 of the melt tank 15. The temperature of the melt 14 is about 600 ° C. when the material 13 is aluminum, for example. In the temperature control position 106, the temperature control tank 16 is heated by, for example, 60 ° C. by the high frequency induction heater 34 to reach 660 ° C., and the melt 14 is held in a liquid state. At the hot water discharge position 107, the melt 14 in the temperature control tank 16 is supplied to a die casting machine (not shown). At the slag removal position 108, the slag in the temperature control tank 16 is removed by the air blown from the air nozzle 43 of the air blowing device 40 in a state where the temperature control tank 16 is turned upside down.

Then, the rotation mechanism of the said melting tank 15 and the temperature control tank 16 is demonstrated. First, the rotation mechanism of the temperature control tank 16 will be described.
As shown in FIGS. 4A to 4C, a cross-shaped rotating member as the lower table 46 is rotatably supported by a driving source (not shown) in an annular frame 47. A circular hole 48 is pierced at each tip of the lower table 46, and a tray 49 shown in FIG. 4B is inserted into each circular hole 48, and a flange portion 49 a of the tray 49 is engaged with the lower table 46. It has been stopped. In the hot water discharge position 107 and the slag removal position 108, an opening 50 that opens the circular hole 48 outward is provided, and the tray 49 can move outward. Furthermore, in the hot water position 107, the open part 51 is formed in the frame 47, and the temperature control tank 16 of the hot water position 107 can be taken out outside. As shown in FIG. 4 (c), the temperature adjustment tank 16 is inserted and held in the tray 49.

  Although the rotation mechanism of the melting tank 15 is not shown, it is configured in the same manner as the rotation mechanism of the temperature control tank 16. However, the opening 50 at the pouring position 107 and the opening 51 of the frame 47 are not provided.

  As shown in FIGS. 2 and 3, the slag removal position 102 of the melting tank 15 and the slag removal position 108 of the temperature control tank 16 are made the same by reversing the rotation directions of the upper table 45 and the lower table 46. The slag removal operation by the air blow device 40 can be performed efficiently.

Next, the case where the melting tank 15 and the temperature control tank 16 are operated in two lines as described above and the case where the melting tank 15 and the temperature control tank 16 are operated in one line will be described in comparison.
As shown in FIG. 5A, when the melting tank 15 and the temperature control tank 16 are operated in one line, the melting operation of the melting tank 15, the slag removal operation, the electrode replacement operation, and the melt installation operation are performed. After the implementation, a melt receiving operation, a temperature control operation, a hot water operation, and a slag removal operation of the temperature control tank 16 are performed. For this reason, the total operation time is an addition time of the total operation time of the melting tank 15 and the total operation time of the temperature adjustment tank 16.

  On the other hand, as shown in FIG. 5B, when the melting tank 15 and the temperature control tank 16 are operated in two series, each operation of the melting tank 15 and each operation of the temperature control tank 16 are performed in parallel. Done. Therefore, the total operation time is either the total time of each operation time of the melting tank 15 or the total time of each operation time of the temperature adjustment tank 16. 5 (a) and 5 (b) conceptually show each operation and operation time, and each operation time of the melting tank 15 and the temperature control tank 16 is indicated by an arrow having the same length. However, there is a difference in actual operation time.

  Accordingly, when the melting tank 15 and the temperature control tank 16 are operated in two lines, the total operation time can be shortened to almost half as compared to when the melting tank 15 and the temperature control tank 16 are operated in one line, and the operation efficiency is remarkably increased. be able to.

Next, a plasma melting method using the plasma melting system 10 will be described.
As shown in FIG. 1, a DC power source 25 is interposed between the plasma torch 12, the electrode 18, and the support rod 30 in a state in which the aluminum to be melted 13 is supported on a pair of support rods 30 in the melting tank 15. A voltage is applied from above to irradiate the melt 13 with the plasma, and the melt 13 is heated to a high temperature of 600 ° C. or higher and melted. The melt 14 obtained by plasma melting of the material 13 to be melted drips down as droplets and is accommodated in the temperature control tank 16 through the communication holes 18 a, 19 a, and 20 a of the melting tank 15.

  As shown in FIG. 2, the melting tank 15 is moved to the slag removal position 102 by the rotation of the upper table 45 when the melting of the melt 13 is completed at the melting position 101, where the slag in the melting tank 15 is moved by the air blow device 40. Is removed. Thereafter, the melting tank 15 is moved to the electrode exchange position 103 where the electrode 18 and the support rod 30 that are difficult to reuse are exchanged. Next, the melting tank 15 is moved to the melt installation position 104, and the melt 13 is inserted into the melt tank 15 at that position and installed.

  On the other hand, as shown in FIG. 3, the temperature control tank 16 receives the melt 14 at the melt receiving position 105 and then moves to the temperature control position 106 by the rotation of the lower table 46. The temperature control tank 16 is provided with a high frequency induction heater 34, and the melt 14 in the temperature control tank 16 is heated to, for example, 660 ° C. at the temperature control position 106, and the liquid state is maintained. Then, the temperature control tank 16 is moved to the hot water discharge position 107, where the melt 14 in the temperature control tank 16 is poured into the die casting machine. Subsequently, the temperature adjustment tank 16 is moved to the slag removal position 108, and the slag in the temperature adjustment tank 16 is removed by the air blowing device 40 in a state where the temperature adjustment tank 16 is turned upside down.

Next, the operation of the plasma melting system 10 of the embodiment configured as described above will be described.
Now, when supplying the melt 14 which melt | dissolved the to-be-melted material 13, such as aluminum, to a die-casting machine etc., the melting furnace 11 is comprised by the melting tank 15 and the temperature control tank 16, and it is parallel in 2 series, respectively. It is configured to be independently rotatable.

  As shown in FIG. 2, the melting tank 15 is configured to be movable to a melting position 101 and other non-melting positions. As shown in FIG. 3, the temperature control tank 16 is configured to be movable between a melt receiving position 105 and other melt non-receiving positions. Then, the melt 13 is melted in the melting tank 15 at the melting position 101 to prepare the melt 14, and the melt 14 is received in the temperature control tank 16 at the melt receiving position 105. In the melting tank 15 in the non-melting position, preparatory operations for melting, that is, operations such as slag removal, electrode replacement, and installation of the material to be melted are performed. Preparation operations, that is, operations such as temperature control operation, hot water operation, slag removal operation, and the like are performed.

  As described above, the melt 14 prepared in the melting tank 15 is not held in the melting tank 15, but is immediately transferred to the temperature adjustment tank 16, and is heated to a predetermined temperature in the temperature adjustment tank 16 at the temperature adjustment position 106. It waits in the state. For this reason, the molten liquid 14 having a temperature required by a die casting machine or the like can be quickly discharged at the outlet position 107 of the temperature control tank 16.

Moreover, each operation of the melting tank 15 and each operation of the temperature control tank 16 can be performed simultaneously in parallel, and each operation of the melting tank 15 and the temperature control tank 16 can be performed efficiently.
In addition, since the melt 14 melted in the melting tank 15 is immediately transferred to the temperature control tank 16, only the solid melt 13 exists substantially in the melt tank 15. On the other hand, the plasma torch 12 may be melted by irradiating the plasma, and no extra plasma energy is required to keep the melt 14 in a liquid state. On the other hand, in the temperature control tank 16, the received molten liquid 14 can be kept in a liquid state at a predetermined temperature, and the hot water can be discharged immediately when necessary. Therefore, it is possible to avoid an excessive temperature rise of the melt 14 generated in the melt tank 15 and to suppress an adverse effect on the quality of the melt 14.

The effect exhibited by the above embodiment is described collectively below.
(1) In the plasma melting system 10 of this embodiment, the melting furnace 11 is composed of an upper melting tank 15 and a lower temperature control tank 16, and the melting tank 15 is movable between a melting position 101 and a non-melting position. The temperature control tank 16 is configured to be movable between a melt receiving position 105 and a melt non-receiving position. Then, the melt 14 melted in the melting tank 15 at the melting position 101 is received in the temperature control tank 16 at the melt receiving position 105, and a preparatory operation for melting is performed in the melting tank 15 at the non-melting position. A preparatory operation for receiving the melt 14 is performed in the temperature control tank 16 at the receiving position.

  In this way, the processing operation can proceed in parallel in two series of the melting tank 15 and the temperature control tank 16, and in the melting tank 15, the melting operation and the non-melting operation can be performed at different positions. In the adjustment tank 16, the melt receiving operation and the melt non-receiving operation can be performed at different positions.

  Therefore, according to the plasma melting system 10 of this embodiment, the melt 14 can be supplied efficiently and quickly, waste of energy can be suppressed, and the quality of the melt can be improved.

  (2) The temperature control tank 16 is provided with a high frequency induction heater 34 for raising the temperature of the received melt 14 by 30 to 150 ° C. For this reason, the melt 14 having a required temperature can be quickly discharged from the temperature control tank 16.

  (3) The melting tank 15 and the temperature adjusting tank 16 are configured to be rotatable, and the melting position 101 and the non-melting position of the melting tank 15 and the melt receiving position 105 and the melt non-receiving position of the temperature adjusting tank 16 are the rotating positions. Determined by. Therefore, each operation can be carried out easily and continuously by the rotating operation of the melting tank 15 and the temperature control tank 16.

  (4) The rotation direction of the melting tank 15 and the rotation direction of the temperature control tank 16 are set in opposite directions. Therefore, for example, the slag removal position 102 of the melting tank 15 and the slag removal position 108 of the temperature control tank 16 can be set at the same position, and the slag removal operation can be efficiently performed using the same slag removal apparatus. .

  (5) In the melting tank 15, a melting position 101 and a plurality of non-melting positions are set every 90 °, and in the temperature control tank 16, a melt receiving position 105 and a plurality of melting are set every 90 °. The liquid non-receiving position is set. For this reason, the melting tank 15 is rotated every 90 ° to easily perform the melting operation and the non-melting operation at fixed positions, and the temperature control tank 16 is rotated every 90 ° to determine the melt receiving operation and the melt non-receiving operation. Easy to do in position.

  (6) The non-melting position of the melting tank 15 is the slag removal position 102, the electrode replacement position 103, and the melt installation position 104, and the molten liquid non-accepting position of the temperature control tank 16 is the temperature control position 106, tapping hot water A position 107 and a slag removal position 108. Therefore, the slag removal operation, the electrode replacement operation, and the melt installation operation are performed at the non-melting position of the melting tank 15, and at the same time, the temperature adjustment operation, the tapping operation, and the slag removal operation are performed at the molten liquid non-receiving position of the temperature control tank 16. Can be done in parallel.

  (7) In the plasma melting method of the present embodiment, the melt 13 is melted in the melting tank 15 at the melting position 101, and the melt 14 is received in the temperature control tank 16 at the melt receiving position 105. A preparatory operation for melting is performed in the melting tank 15 at the non-melting position, and a preparatory operation for receiving the molten liquid 14 is performed in the temperature control tank 16 at the non-melt receiving position.

  Therefore, the melting operation and other operations by the melting tank 15 and the temperature adjustment operation and other operations by the temperature adjusting tank 16 can be efficiently advanced in parallel.

Hereinafter, the embodiment will be described more specifically with reference to examples and comparative examples.
Example 1
As shown in FIG. 1, in the plasma melting system 10 of the first embodiment, the melting furnace 11 is composed of a melting tank 15 at the upper position and a temperature control tank 16 at the lower position. As shown in FIG. 2, the melting tank 15 is configured to be rotatable counterclockwise by a rotation mechanism, and the slag removal position 102, the electrode replacement position 103, and the melted object installation position 104 at every rotation angle of 90 ° from the melting position 101. Rotated to On the other hand, as shown in FIG. 3, the temperature adjustment tank 16 is configured to be rotatable in the clockwise direction by the rotation mechanism, and the temperature adjustment position 106, the tapping position 107, and the slag removal position at every rotation angle 90 ° from the melt receiving position 105. Rotate to 108.

  Then, 1 kg of aluminum was used as the material to be melted 13, and the material to be melted 13 was heated from 20 ° C. to 600 ° C. for 40 seconds in the melting tank 15 at the melting position 101 and melted. The molten melt 14 was immediately stored in the temperature control tank 16 at the melt receiving position 105.

  The melting tank 15 is rotated to move to the slag removal position 102 and slag is removed in 5 seconds, and further moved to the electrode replacement position 103 to replace the electrode in 15 seconds. The melt 13 was placed in 20 seconds.

  On the other hand, the temperature control tank 16 moves to the temperature control position 106, and after the material to be melted 13 is heated for 10 seconds and heated to 660 to 680 ° C., the material to be melted 13 is discharged from the hot water position 107 in 30 seconds. After that, the slag was removed from the temperature control tank 16 at the slag removal position 108 in 5 seconds.

  Thus, in the plasma melting system 10 of Example 1, the melting furnace 11 is composed of two stages of the upper and lower stages of the melting tank 15 and the temperature control tank 16, and each operation is performed in two series. The molten liquid 13 is immediately transferred from the melting tank 15 to the temperature adjustment tank 16 and heated in the temperature adjustment tank 16 at the temperature adjustment position 106 to wait for the hot water. For this reason, the melting tank 15 which has been emptied can move to melting of the new melted material 13 after about 40 seconds. Accordingly, the time for preparing the melt 14 to be discharged to a die casting machine or the like can be greatly shortened, the waste of plasma energy can be saved, and the quality of the melt 14 can be improved by suppressing the oxidation of the melt 14. .

(Comparative Example 1)
In this comparative example 1, in the said Example 1, each rotation mechanism of the melting tank 15 and the temperature control tank 16 is abbreviate | omitted, the molten liquid 14 from the melting tank 15 is received in the temperature control tank 16, and the temperature control tank in the position After heating 16, the temperature control tank 16 was tilted to discharge the melt 14.

  That is, in the melting tank 15, 1 kg of aluminum as the material to be melted 13 was heated from 20 ° C. to 600 ° C. for 40 seconds to prepare the melt 14. The melt 14 was immediately received in the temperature control tank 16, where the temperature control tank 16 was heated for 10 seconds, and the temperature of the melt was increased from 600 ° C to 660-680 ° C. Then, the temperature control tank 16 was inclined and the molten liquid 14 in it was discharged in 30 seconds. Next, slag removal from the melting tank 15, electrode replacement, and placement of the material to be melted 13 were performed in the same manner as in Example 1.

  As described above, in Comparative Example 1, the temperature control tank 16 is heated at the position where the melt 14 from the melting tank 15 is received and discharged, so that the next melted material 13 is melted in the melting tank 15. This operation can only be performed after 80 seconds have elapsed since the previous melting operation. For this reason, the time required for preparing the molten liquid 14 discharged from the temperature control tank 16 becomes longer, and the production efficiency is remarkably lowered.

It should be noted that the embodiment described above can be modified and embodied as follows.
As shown in FIGS. 11A and 11B, a preheating support base 52 is installed in the vicinity of the melt installation position 104 in the non-melting position of the melting tank 15, and a plurality of melts 13 are provided there. The melt 13 is preheated by a preheater 53 provided above and supported, and the preheated melt 13 is installed in the melt tank 15 at the melt installation position 104. Good. In this case, the preheating time of the melt 13 can be set appropriately without being limited by the rotation time of the upper table 45, and the preheating can be performed for a longer time.

  In the melting system shown in FIG. 2, a preheating position may be provided between the electrode replacement position 103 and the melt installation position 104, and the melt 13 may be preheated by the preheater 53 there. .

  As the preheater 53, a ceramic heater, an infrared heater or the like is used, and the preheating temperature is preferably 300 to 500 ° C. If comprised as mentioned above, time required to melt the to-be-melted material 13 in the melting tank 15 of the melting position 101 can be shortened.

-You may comprise so that the rotation direction of the said melting tank 15 and the rotation direction of the temperature control tank 16 may become the same.
A plurality of operations may be performed at one non-melting position of the melting tank 15, and a plurality of operations may be performed at one melt non-receiving position of the temperature control tank 16.

In the temperature control tank 16 at the melt receiving position 105, the melt 14 may be heated by the high frequency induction heater 34 and discharged at the melt non-receiving position.
-You may change suitably the process number and time of each operation in the non-melting position of the said melting tank 15, and the melt non-accepting position of the temperature control tank 16. FIG. For example, the electrode replacement operation may be omitted at the non-melting position of the melting tank 15, or an operation such as an oxide removal operation may be added at the molten liquid non-receiving position of the temperature control tank 16. In that case, it is desirable to synchronize the operation time of the melting tank 15 and the temperature control tank 16.

DESCRIPTION OF SYMBOLS 10 ... Plasma melting system, 11 ... Melting furnace, 12 ... Plasma torch, 13 ... Material to be melted, 14 ... Molten liquid, 15 ... Melting tank, 16 ... Temperature control tank, 101 ... Melting position, 102, 108 ... Slag removal position , 103 ... Electrode replacement position, 104 ... Melt installation position, 105 ... Melt receiving position, 106 ... Temperature control position, 107 ... Tapping position.

Claims (8)

A plasma melting system for melting a material to be melted in a melting furnace by a plasma torch,
The melting furnace is located in the upper part and melts the material to be melted by plasma based on a plasma torch to prepare a melt, and in the lower part is a temperature for receiving the melt and holding it in a liquid state. The melting tank is configured to be movable between a melting position and a non-melting position, and the temperature control tank is configured to be movable between a melt receiving position and a melt non-receiving position to melt The molten liquid melted in the melt tank at the position is received in the temperature control tank at the melt receiving position, the preparatory operation for melting is performed in the melt tank at the non-melting position, and the melt is melted in the temperature control tank at the non-melt receiving position. A plasma melting system configured to perform preparatory operations for acceptance.   The plasma melting system according to claim 1, wherein the temperature control tank includes a heater for raising the temperature of the received melt by 30 to 150 ° C.   The melting tank and the temperature control tank are configured to be rotatable, and the melting position and the non-melting position of the melting tank and the melt receiving position and the melt non-receiving position of the temperature control tank are determined by the rotation position. The plasma melting system according to claim 1 or claim 2.   The plasma melting system according to claim 3, wherein a rotation direction of the melting tank and a rotation direction of the temperature control tank are set in opposite directions.   In the melting tank, a melting position and a plurality of non-melting positions are set every 90 °, and in the temperature adjusting tank, a melt receiving position and a plurality of melt non-receiving positions are set every 90 °. The plasma melting system according to claim 4.   The non-melting position of the melting tank is a slag removal position, an electrode replacement position, and a melt installation position, and the molten liquid non-receiving position of the temperature control tank is a temperature control position, a tapping position, and a slag removal position. 6. The plasma melting system according to 5. A plasma melting method using the plasma melting system according to any one of claims 1 to 6,
After melting the melted material in the melting tank at the melting position and receiving the prepared melt in the temperature control tank at the melt receiving position, perform the preparatory operation for melting in the melting tank at the non-melting position. A plasma melting method in which a preparatory operation for accepting a melt is performed in a temperature control tank at a melt non-accepting position. The plasma melting method according to claim 7, wherein the temperature control tank includes a heater, and the temperature of the melt received in the temperature control tank is increased by 30 to 150 ° C.

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