JP2011115844A - Molten metal feed device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molten metal feed device in which the liquid level of molten metal in a duct is increased to the height of an inductor by a simple operation, and also, the liquid level can be held without depending on the presence of the electromagnetic force of an electromagnetic pump for molten metal, thus the molten metal of fixed quantity is fed in a short cycle upon the start of the operation and also per time. <P>SOLUTION: In the molten metal feed device, a duct 1 is provided with an inductor 14, thrust is applied to a molten metal in the duct 1 by the inductor 14 to feed the molten metal. The device includes: the inductor 14 for feeding molten metal feed for applying thrust to the molten metal in the duct 1 and feeding the molten metal; and an inductor 24 for rising having heat resistance for pumping up the molten metal in the duct 1 to the height of the inductor 14 for molten metal feed, wherein the inductor 24 for rising is arranged at a position lower than the liquid level of the molten metal 12 stored into the molten metal tank. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a molten metal supply apparatus using an induction electromagnetic pump for molten metal used for conveying molten metal such as molten aluminum and molten zinc, and in particular, provided with two stages of inductors, The present invention relates to a molten metal supply apparatus that pumps up a molten metal level to a height at which the thrust of an upper hot water supply inductor acts with an inductor, and then can supply molten metal as needed by controlling energization to the hot water inductor.

  For example, in the field of casting or the like, an electromagnetic pump for molten metal is used to convey molten aluminum or the like by applying a thrust to the molten metal by electromagnetic induction. Such an electromagnetic pump for molten metal is an induction type electromagnetic type in which a moving magnetic field is generated inside a cylindrical duct by an inductor having a coil wound around a magnetic yoke, and thrust is applied to the molten metal to be supplied. Pumps are mainstream.

  Such an induction type electromagnetic pump is described in, for example, Japanese Patent Application Laid-Open No. 2006-341281. A tubular duct through which molten metal flows is surrounded by an inductor having a coil wound around a yoke, and a magnetic core serving as a magnetic path of a magnetic field generated by the inductor is disposed inside the tubular duct. The core is covered with a cylindrical protective tube having heat resistance and corrosion resistance. The flow path of the molten metal is a cross-sectional annular portion formed between the tubular duct and the protective tube therein, and has a structure that generates a moving magnetic field in this portion and gives thrust to the molten metal. Due to its flow path shape, this type of electromagnetic pump is also called an annular flow path type electromagnetic pump.

FIG. 8 shows a conventional example of a molten metal supply apparatus using the above-described electromagnetic pump for molten metal, and is a general one for conveying molten aluminum or molten zinc.
The lower end of the pump side duct 1 is inserted into the liquid surface of the molten metal 12. A hot water supply side duct 1 ′ is connected to the pump side duct 1 via joints 5 and 5 ′ such as flange joints. The hot water supply side duct 1 'is pressed against the pump side duct 1 by a spring or the like (not shown), and the joints 5, 5' are inserted by heat resistant gaskets inserted between the joints 5, 5 '. Sealability is ensured. These ducts 1, 1 ′ are made of a heat-resistant and corrosion-resistant material such as ceramic, and a heater 9 is wound on the outside for heat insulation so as to be heated to a temperature higher than the melting point of the molten metal. It has become.

  Around the pump-side duct 1 on the front side, an inductor 14 in which a coil 16 is wound around a magnetic yoke 15 is arranged. Further, a core 2 made of a magnetic cylinder is disposed in the pump side duct 1 so that the central axes thereof coincide with each other. The core 2 is accommodated in a cylindrical protective tube 3 whose both ends are closed, and is not in direct contact with the molten metal 12 in the pump-side duct 1. The protective tube 3 is made of a heat-resistant and corrosion-resistant material such as ceramic, and a ceramic fiber such as alumina or magnesia or a filler 8 such as ceramic powder is filled around the core 2 therein as a cushioning material. Has been.

  A flange 6 extends around one end of the protective tube 3 near the hot water supply side duct 1 ', and a portion near the outer periphery of the flange 6 connects the pump side duct 1 and the hot water supply side duct 1'; Sandwiched between 5 '. Thereby, the core 2 is held so as to be positioned at the center of the pump-side duct 1. The pump side duct 1 and the hot water supply side duct 1 ′ are heated by heaters 9, 9 ′ made of a heat retaining microheater and the like provided on the outer periphery thereof to prevent the molten metal 12 from solidifying. The flange 6 is provided with a plurality of arc-shaped passage holes 7 serving as passages for the molten metal 12.

  In such a type of molten metal supply device, the liquid level of the molten metal 12 does not reach the inductor 14 before the operation of the inductor 14 is started. Therefore, the molten metal level in the duct 1 reaches the inductor 14 when the molten metal is supplied, and the level of the molten metal in the duct 1 is adjusted so that thrust can be applied to the molten metal in the duct 1 by the inductor 14. An auxiliary means of holding is required.

  As an example of the molten metal supply device provided with such auxiliary means, as described in Japanese Patent Application Laid-Open No. 11-10302 cited as Patent Document 4 below, a method of immersing an immersion body in a molten metal tank There is a molten metal feeder. That is, the immersion body is immersed in a molten metal tank containing molten metal, the molten metal in the molten metal tank is pushed up by the volume, and the liquid level of the molten metal in the duct leading to the molten metal tank is increased to the height of the inductor.

  As another example, as described in Japanese Patent Application Laid-Open No. 2007-69255 cited as the following Patent Document 3 and Japanese Utility Model Laid-Open No. 1-68156 cited as the following Patent Document 5, a method of decompressing the duct with a vacuum suction pump is used. There is also a molten metal supply apparatus. That is, the inside of the duct is depressurized by a vacuum suction pump, the molten metal in the duct is pulled up to the height of the inductor by atmospheric pressure, and then the molten metal is supplied by controlling energization to the inductor.

  However, in the former molten metal supply apparatus in which the immersion body is immersed in the molten metal tank, a heavy lifting apparatus such as a crane has to be provided in order to handle a heavy immersion body, resulting in a large facility. Further, it is difficult to finely adjust the liquid level of the molten metal in the duct, and it is difficult to meet the demand for supplying a fixed amount of molten metal repeatedly and accurately.

  In the latter case, it is necessary to provide a vacuum suction pump for decompressing the inside of the duct, and also to ensure the airtightness of the duct. It becomes complicated. Also, it takes time to connect the vacuum pump to the duct. In addition, every time the molten metal is supplied before the operation, the duct outlet is opened to return the inside of the duct from the vacuum to the atmospheric pressure. Therefore, it is necessary to depressurize the duct every time the molten metal is supplied. Therefore, the supply of molten metal cannot be repeated quickly and repeatedly, and the cycle time of supplying the molten metal becomes long.

JP 2009-12024 A JP 2009-6343 A JP 2007-69255 A Japanese Patent Laid-Open No. 11-10302 Public Utility Hei 1-68156

  In view of the problems in the conventional electromagnetic pump for molten metal described above, the present invention provides a simple operation to increase the height of an inductor when supplying molten metal with an inductor disposed on the liquid surface of the molten metal in a molten metal tank. It is possible to raise the liquid level of the molten metal in the duct and maintain the liquid level regardless of the presence or absence of electromagnetic force of the molten metal electromagnetic pump. It aims at providing the molten metal supply apparatus which can be supplied by a cycle.

  In the present invention, in order to achieve the above object, a hot water supply inductor 14 for supplying a thrust to the molten metal in the duct 1 and supplying the molten metal in the duct 1 to the height of the hot water supply inductor 14 is provided. A riser inductor 24 having heat resistance for drawing up and maintaining the height was used. As a result, the molten metal 12 can be supplied to the target location through the ducts 1, 1 ′ at any time only by controlling the energization of the inductor.

  That is, the molten metal supply device according to the present invention is provided with an inductor 14 in the duct 1, and in the molten metal supply device that supplies the molten metal by applying thrust to the molten metal in the duct 1 by the inductor 14. A hot water induction inductor 14 for supplying a molten metal with a thrust, and a riser inductor 24 having heat resistance for pumping the molten metal in the duct 1 up to the height of the hot water induction inductor 14. The riser inductor 24 is disposed at a position lower than the liquid level of the molten metal 12 housed in the molten metal tank.

  As the riser inductor 24 having heat resistance, one using an inorganic insulating cable having high heat resistance as a winding can be cited. This inorganic insulated cable is a so-called sheathed cable in which a conductive wire is housed in a metal sheath such as a stainless tube, and an inorganic insulating powder such as magnesia powder is filled between the conductive wire and the sheath. A winding is constituted by this inorganic insulated cable to form a coil 26, and a yoke 25 is attached to the outside thereof to constitute a rising inductor 24. The riser inductor 24 composed of an inorganic insulated cable has high heat resistance and can be used at around 800 ° C., which is higher than the melting point of molten aluminum. For this reason, the riser inductor 24 can be used by being disposed at a position lower than the liquid level of the molten metal 12 stored in the molten metal tank, without cooling without the cooling means.

  Since the inorganic insulated cable has a larger diameter than a normal cable as a whole, the number of turns of the coil 26 of the riser inductor 24 wound thereby is made smaller than the number of turns of the coil 16 of the hot water supply inductor 14. However, the current supplied to the coil 26 of the startup inductor 24 is made larger than that to the current supplied to the coil 16 of the hot water supply inductor 14. This ensures a sufficient magnetic flux density to pump the molten metal into the duct 1.

  The riser inductor 24 is always energized and controlled in conjunction with a sensor 19 such as a liquid level sensor that detects the liquid level of the molten metal in the duct 1, so that the level of the molten metal in the duct 1 is always supplied with hot water. It can be controlled to maintain the height of the inductor 14 for use. Further, if the electromagnetic force of the hot water supply inductor 14 is increased while weakening the electromagnetic force of the riser inductor 24 so as to maintain the position of the sensor 19 that detects the liquid level, the electromagnetic force of the riser inductor 24 is increased. Even when the force is zero, the liquid level can be maintained only by the electromagnetic force of the hot water supply inductor 14. Of course, it goes without saying that the liquid level can be maintained without making the electromagnetic force of the riser inductor 24 zero. Further, when the supply of the molten metal stops, the molten metal flowing from the pump side duct 1 toward the hot water supply side duct 1 ′ is braked by energizing the startup inductor 24 with a three-phase alternating current in reverse phase. The flow of molten metal can also be stopped.

  As described above, in the molten metal supply apparatus according to the present invention, the molten metal 12 is pumped into the duct 1 by the rising inductor 24 immersed in the molten metal 12, and the level of the molten metal in the duct 1 is induced for hot water supply. By increasing the height to the height of the child 14, molten metal can be supplied by controlling the power to the hot water supply inductor 14. Since the level of the molten metal in the duct 1 can be raised to the height of the hot water supply inductor 14 by the startup inductor 24, the supply of the molten metal by the hot water supply inductor 14 can be repeatedly performed in a short cycle. It becomes possible.

It is sectional drawing which shows one Example of the molten metal supply apparatus by this invention. It is the elements on larger scale of FIG. 1 which shows one Example of the molten metal supply apparatus by this invention. It is a control system figure which shows one Example of the molten metal supply apparatus by this invention. It is a graph which shows the example of the control output of the inductor for start-up which shows one Example of the molten metal supply apparatus by this invention, and the inductor for hot water supply. It is sectional drawing which shows the other Example of the molten metal supply apparatus by this invention. It is sectional drawing which shows the other Example of the molten metal supply apparatus by this invention. It is sectional drawing which shows the other Example of the molten metal supply apparatus by this invention. It is sectional drawing which shows the prior art example of a molten metal supply apparatus.

In the present invention, a two-stage induction of a hot water supply inductor 14 for supplying molten metal as needed and a rising inductor 24 for pumping up the molten metal in the duct 1 to the height of the hot water supply inductor 14. The purpose is achieved by providing a child.
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

  FIG. 1 shows an embodiment of a molten metal supply apparatus according to the present invention. This molten metal supply apparatus has two stages of inductors, an upper hot water supply inductor 14 and a lower riser inductor 24. Among these, the configuration of the portion where the upper hot water supply inductor 14 is arranged is basically the same as that of the conventional electromagnetic pump described above with reference to FIG. 8, and the same portions are denoted by the same reference numerals.

  The lower end of the pump side duct 1 is inserted into the liquid level of the molten metal 12 accommodated in a molten metal tank (not shown). Around the portion above the liquid level of the molten metal 12 of the pump-side duct 1 is disposed a hot water supply inductor 14 in which a coil 16 is wound around a magnetic yoke 15. The yoke 15 is fitted on the outer peripheral side so as to surround a portion of the pump side duct 1 that is above the liquid level of the molten metal 12, and a coil 16 constituting a three-phase coil is wound around the yoke 15. Yes.

  A core 2 made of a magnetic cylinder is disposed at a position corresponding to the hot water supply inductor 14 in the pump-side duct 1 so that the central axes thereof coincide with each other. The core 2 is accommodated in a cylindrical protective tube 3 whose both ends are closed, and is not in direct contact with molten metal passing through a passage in the pump side duct 1. A gap is formed between the pump-side duct 1 and the protective tube 3, and this portion becomes a passage for molten metal. The protective tube 3 is made of a heat-resistant and corrosion-resistant material such as ceramic, and a ceramic fiber such as alumina or magnesia or ceramic powder is used as a cushioning material between the core 2 and the protective tube 3 therein. Filler 8 is filled.

  Further, a rising inductor 24 is disposed around a portion below the inductor 14 of the pump-side duct 1. As shown in FIG. 2, similarly to the hot water supply inductor 14, the rising inductor 24 is a magnetic body fitted on the outer periphery of a portion below the inductor 14 of the pump side duct 1. A coil 26 is wound around a yoke 25 made of metal. The coil 26 of the rising inductor 24 is wound around a heat-resistant inorganic insulating cable. The inorganic insulated cable has a structure in which a conductive wire is housed in a sheath made of a stainless steel tube or the like, and the conductive wire and the sheath are insulated by an inorganic insulating powder such as magnesia powder filled therebetween. It is called a so-called sheath cable. Such an inorganic insulated cable has high heat resistance and can withstand a temperature of 800 ° C. However, the number of turns of the coil 26 of the startup inductor 24 is smaller than that of the coil 16 of the hot water supply inductor 14.

  A core 22 made of a magnetic cylinder is disposed at a position corresponding to the rising inductor 24 in the pump-side duct 1 so that the central axes thereof coincide with each other. The core 22 is housed in a position below the core 2 in the protective tube 3 in which the upper core 2 is housed, and does not come into direct contact with the molten metal in the pump-side duct 1. ing. Of course, the portion of the protective tube 3 in which the lower core 22 is accommodated is also filled with a filler 8 such as ceramic fiber such as alumina or magnesia or ceramic powder as a cushioning material between the core 22 and the protective tube 3. Has been. The lower end of the protective tube 3 is closed. In addition, you may comprise the upper core 2 and the lower core 22 as a continuous integral core.

  The rising inductor 24 is surrounded by a cylindrical protective case 17 made of heat-resistant ceramic or the like. The upper end opening of the protective case 17 is fixed to the lower end surface of the upper hot water supply inductor 14. The opening at the lower end of the protective case 17 is closely joined to the lower end of the pump side duct 1, and the inner side surrounded by the joint is an inlet for molten metal at the lower end of the pump side duct 1. It is 18.

  A hot water supply side duct 1 ′ composed of an L-shaped elbow pipe is closely connected to the upper end of the pump side duct 1 via joints 5 and 5 ′ such as flange joints. A flange 6 extends around one end portion of the protective tube 3 near the hot water supply side duct 1 ′, and a portion close to the outer periphery of the flange 6 connects the pump side duct 1 and the hot water supply side duct 1 ′. It is sandwiched between the joints 5 and 5 ′. As a result, the cores 2 and 22 in the protective tube 3 are held so as to be positioned at the center of the pump-side duct 1. The flange 6 is provided with a plurality of arc-shaped passage holes 7 serving as passages for the molten metal 12. The hot water supply side duct 1 ′ is elastically pressed against the pump side duct 1 in front by a spring or the like (not shown). In this state, the sealability of the joints 5 and 5 'is ensured by the heat-resistant gasket inserted between the joints 5 and 5'.

The pump side duct 1 and the hot water supply side duct 1 ′ are made of a heat-resistant and corrosion-resistant material such as ceramic, and molten metal is formed by heaters 9, 9 ′ made of heat retaining microheaters provided on the outer periphery thereof. Heated to a temperature equal to or higher than the melting point of 12 to prevent solidification of the molten metal 12.
A sensor 19 such as a liquid level sensor is provided on the base end side of the hot water supply side duct 1 ′ connected to the pump side duct 1, whereby the liquid level in the pump side duct 1 is detected. A gate valve 27 is provided at the distal end side of the hot water supply side duct 1 ′, and a molten metal supply destination 20 such as a mold is disposed at the tip of the gate valve 27. The molten metal supply destination 20 is provided with a sensor 23 for detecting that molten metal has been supplied thereto. The gate valve 27 may be omitted, but is attached to prevent oxidation of the hot water supply side duct 1 ′ and the liquid level in the duct 1. The gate valve 27 is open during hot water supply.

  In such a molten metal supply device, for example, when the molten metal is not pumped up to the height of the hot water supply inductor 14 in the pump-side duct 1 as in the stage before the molten metal supply operation, first, the molten metal supply device is set up. The inductor 24 is energized with a three-phase alternating current, and a moving magnetic field is generated in the pump-side duct 1 inside the inductor 24. As a result, the molten metal is pumped into the pump-side duct 1, and as shown in FIG. The liquid level of the molten metal in the duct 1 is raised to the height of the hot water supply inductor 14, that is, the height at which the thrust can be exerted on the molten metal by the hot water supply inductor 14. Although the number of turns of the coil 26 of the startup inductor 24 is small, a large current is passed through the startup inductor 24 by that amount, and the liquid level of the molten metal in the pump-side duct 1 is changed to that of the hot water supply inductor 14. Forms the magnetic flux density needed to raise to height.

  Since the winding 26 of the rising inductor 24 is made of a heat-resistant sheath cable, it is suitable for supplying a large current. In addition, if a three-phase alternating current having a phase opposite to that described above is energized to the startup inductor 24 before operation, self-heating of the conductive wire of the coil 26 is prevented while preventing molten metal from entering the pump-side duct 1. The sheath of the coil 26 is heated by the principle of electromagnetic induction heating, and the pump side duct 1 can be preheated. This preheating is performed prior to the pumping of the molten metal. Of course, it goes without saying that the pump-side duct 1 can be preheated also by the heater 9.

  The sensor 19 detects that the liquid level of the molten metal in the pump-side duct 1 has reached the height of the hot water supply inductor 14 by energization of the startup inductor 24, and the supply destination of the molten metal When the sensor 23 detects that no molten metal is supplied to 20, a three-phase alternating current is energized to the hot water supply inductor 14 and a moving magnetic field is generated in the pump side duct 1. At this time, the gate valve 27 is opened. Thereby, the molten metal in the pump side duct 1 is pumped up, and this molten metal is supplied to the supply destination 20 of the molten metal through the supply side duct 1 ′.

  Further, as will be described later, after raising the liquid level to the hot water supply inductor 14 by the riser inductor 24, the hot water supply is made while lowering the output of the riser inductor 24 so that the liquid level detected by the sensor 19 is maintained. The output of the induction inductor 14 is increased, finally the output of the startup inductor 24 is made zero, the liquid level is maintained only by the output of the hot water supply inductor 14, and the output of the hot water supply inductor 14 is further increased. It is also possible to supply the molten metal to the supply destination 20 simply by adjusting. Generally, controllability is better when the output is adjusted using only one output adjuster.

  When the supply of a predetermined amount of molten metal to the supply destination 20 is completed, the gate valve 27 is closed and the supply of molten metal is stopped. Before closing the gate valve 27, the output of the hot water supply inductor 14 is adjusted and the liquid level is returned to the liquid level detection position of the sensor 19, and the startup inductor 24 is energized with an antiphase three-phase alternating current. By doing so, it is possible to brake the molten metal flowing from the pump side duct 1 toward the hot water supply side duct 1 ′, and to stop the flow of the molten metal instantaneously. Thereafter, electric power is supplied to the hot water supply inductor 14 so that the liquid level of the molten metal in the pump-side duct 1 is maintained at the height of the hot water supply inductor 14. In this state, since the liquid level of the molten metal in the pump-side duct 1 is maintained only by energizing the hot water supply inductor 14, the energization of the start-up inductor 24 becomes unnecessary.

  A control system for controlling such operation is shown in FIG. In FIG. 3, the controller 11 receives the detection signals from the liquid level sensors 13, 19, 23 and controls the power supply 31, the power supply 32, and the power supply 33 to control the hot water supply inductor 14, the riser inductor 24, the hot water supply induction The child 14 and the gate valve 27 are energized as described above. Thereby, a fixed amount of molten metal is supplied to the supply destination 20 such as a mold that requires supply of molten metal each time.

  FIG. 4 shows an example of the relationship between the control outputs of the hot water supply inductor 14 and the startup inductor 24. The relationship between the control outputs of the hot water supply inductor 14 and the startup inductor 24 shown in FIG. 4 is a simple linear one, but the startup inductor 24 gradually rises like a sine curve. Needless to say, it is not necessary for the hot water supply inductor 14 to be gradually lowered so that there is no fluctuation of the hot water surface.

At the start of operation, the molten metal in the pump duct 1 is first pumped up to the height of the hot water supply inductor 14 by the output of the startup inductor 24. Thereafter, the output of the hot water supply inductor 14 is gradually increased, and the output of the riser inductor 24 is decreased by that amount, and the balance of both outputs is balanced while the molten metal of the pump side duct 1 is balanced. Maintain liquid level. As is clear from the principle of Trichery, if the output of the hot water induction inductor 14 can produce an output equivalent to the atmospheric pressure even if the output of the startup inductor 24 is zero, the specific gravity of the molten aluminum alloy is increased. In the case of 2.5 g / cm ³ , it can hold up to 4 m. Therefore, if the output of the hot water supply inductor 14 is large, the output of the riser inductor 24 is eliminated during hot water supply, rather than controlling two inductors. Controllability is better when only the inductor is controlled.

  Thereafter, when the output of the hot water supply inductor 14 is further increased, the molten metal is sent to the hot water supply side duct 1 ′, and the molten metal is supplied from the tip thereof. Thus, after the molten metal in the pump-side duct 1 is pumped up to the height of the hot water supply inductor 14, the output of the riser inductor 24 is set to zero, and the liquid level is obtained only by the output of the hot water supply inductor 14. The molten metal is supplied to the supply destination 20 simply by adjusting the output of the hot water supply inductor 14.

  Next, another embodiment of the molten metal supply apparatus shown in FIG. 5 will be described. The embodiment shown in FIG. 1 is an example in which the molten metal is supplied to the molten metal supply destination 20 with the pump-side duct 1 standing substantially vertically and the hot water supply-side duct 1 ′ being substantially horizontal. On the other hand, in the embodiment shown in FIG. 5, the pump side duct 1 made of a straight pipe and the hot water supply side duct 1 'made of an elbow pipe are arranged obliquely by about ± 45 ° to supply molten metal such as a mold. In this example, molten metal is supplied to the tip 20 ′. The startup inductor 24 and the hot water supply inductor 14 provided in the pump side duct 1 are also installed at the same angle as the pump side duct 1. The mold that is the molten metal supply destination 20 ′ is driven by the mold drive mechanism 21, and assembly and demolding are performed. Other than this, the configuration of the embodiment shown in FIG. 5 is basically the same as that of the embodiment described above with reference to FIGS. 1 to 4, and corresponding portions are denoted by the same reference numerals. Detailed description of common corresponding parts is omitted.

  Next, another embodiment of the molten metal supply apparatus shown in FIG. 6 will be described. The embodiment shown in FIG. 6 is basically in common with the molten metal supply apparatus of the embodiment described above with reference to FIG. That is, the pump side duct 1 and the hot water supply side duct 1 ′ are arranged obliquely by about ± 45 °, and the molten metal is supplied to a molten metal supply destination 20 ′ such as a mold. In this embodiment, however, a gate valve 27 for opening and closing the hot water supply side duct 1 ′ is provided in the hot water supply side duct 1 ′ composed of an elbow pipe, and a liquid level for detecting the liquid level of the molten metal in the pump side duct 1. A sensor 19 such as a sensor is provided. In this embodiment, the gate valve 27 is driven to open and close for a fixed amount of molten metal. The other configuration of the embodiment shown in FIG. 6 is basically the same as that of the embodiment described above with reference to FIG. 5, and corresponding portions are denoted by the same reference numerals. Detailed description of common corresponding parts is omitted.

  The embodiment shown in FIG. 7 is an example in which this molten metal supply device is applied to a low pressure casting device. The pump side duct 1 and the hot water supply side duct 1 ′ are provided substantially vertically, and a molten metal supply destination 20 ″ as a mold is connected to the upper end of the hot water supply side duct 1 ′. The molten metal supply destination 20 ″. The mold is driven and operated by a mold drive mechanism 21 ', and its assembly and demolding are performed. Molten metal is supplied from the lower hot water supply port through the hot water supply side duct 1 ′ to the mold that is the molten metal supply destination 20 ″. The configuration of the embodiment shown in FIG. 4 are the same as those of the embodiment described above, and corresponding portions are denoted by the same reference numerals, and detailed descriptions of common corresponding portions are omitted.

  Since the molten metal supply apparatus according to the present invention can supply molten metal repeatedly only by energization control of the inductors 14 and 24 without using vacuum suction or an immersion body, a fixed amount of melting is performed each time as in casting. It can be used in fields that require metal supply.

DESCRIPTION OF SYMBOLS 1 Pump side duct 1 'Hot water supply side duct 13 Liquid level sensor 14 Hot water supply inductor 19 Liquid level sensor 23 Liquid level sensor 24 Startup inductor

Claims (7)

In a molten metal supply device that provides inductors 14, 24 to the duct 1 and applies thrust to the molten metal in the duct 1 by the inductors 14, 24 to supply the molten metal, thrust is applied to the molten metal in the duct 1. A hot water supply inductor 14 for feeding and supplying, and a rising inductor 24 having heat resistance for pumping molten metal in the duct 1 up to the height of the hot water inductor 14, are provided. The molten metal supply apparatus characterized by arranging the child 24 at a position lower than the liquid level of the molten metal 12 housed in the molten metal tank. 2. The molten metal supply apparatus according to claim 1, wherein the rising inductor is made of an inorganic insulated cable used as a winding. The molten metal supply apparatus according to claim 2, wherein the startup inductor 24 is an uncooled inductor having no cooling means. 4. The energization control of the hot water supply inductor 14 and the startup inductor 24 is performed in conjunction with a sensor 19 that detects the liquid level of the molten metal in the duct 1. Molten metal supply device. 5. The molten metal supply according to claim 1, wherein when the molten metal in the duct 1 is supplied, the molten metal is braked by supplying a current in a reverse phase to the startup inductor 24. apparatus. The number of turns of the coil 25 of the riser inductor 24 is made smaller than the number of turns of the coil 15 of the hot water supply inductor 14, and the current supplied to the coil 25 of the riser inductor 24 is supplied to the coil 15 of the hot water inductor 14. The molten metal supply device according to claim 1, wherein the molten metal supply device is larger than a current to be energized. The riser 24 raises the liquid level to the hot water supply inductor 14, lowers the output of the riser inductor 24 so as to maintain this liquid level, and increases the output of the hot water supply inductor 14. 7. The hot water supply control is performed by merely increasing the output of the hot water supply inductor 14 while maintaining the liquid level mainly by the output of the hot water supply inductor 14. The molten metal supply apparatus as described.

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