JP2007069255A - Molten metal feeder, and method for feeding molten metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molten metal feeder capable of feeding molten metal in a furnace to a casting machine without dipping an electromagnetic pump into the molten metal in the furnace. <P>SOLUTION: The molten metal feeder is provided with: a molten metal feed tube 43 in which one end 43a is dipped into molten metal 41 stored in a furnace 42, and the other end 43b is connected to a molten metal injection means 47 arranged at the outside of the furnace 42; a suction means 10 of decompressing the inside of the molten metal feed tube 43 from the side of the other end 43b and sucking the molten metal 41; a driving force impartation means 30 arranged around the molten metal feed tube 43 located at the outside of the furnace 42 and imparting driving force for going to the other end 43b to the molten metal 41 in the molten metal feed tube 43 in a non-contact state; a detection means 20 of detecting the fact that the sucked molten metal 41 has reached a position on which driving force acts; and a control means 40 where, in the case the fact that the molten metal 41 has reached a position on which driving force acts by the driving force impartation means 30 is detected, the suction by the suction means 10 is stopped, further, the working of the driving force impartation means 30 is started, and driving force is imparted to the molten metal 41. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a molten metal supply apparatus and a molten metal supply method for supplying a molten metal stored in a furnace to an injection device or the like outside the furnace.

  An electromagnetic pump for sending molten metal stored in a furnace to the outside of the furnace is disclosed in, for example, Japanese Patent Laid-Open No. 63-157661 (Patent Document 1). However, in order for this electromagnetic pump to function, the height of the electromagnetic coil of the electromagnetic pump and the height of the molten metal are required to be the same due to the characteristics of the electromagnetic pump. Therefore, in the invention disclosed in Patent Document 1, as shown in FIG. 4A, the electromagnetic pump 31 is immersed in the molten metal 41 and the height of the electromagnetic coil 31a incorporated in the electromagnetic pump 31 and the furnace 42a. The height of the inner molten metal surface 41a is the same.

Moreover, as shown in FIG.4 (c), the external type electromagnetic pump 32 is installed in the hot water supply pipe 43 extended toward the outer side of the furnace 42b from the side wall of the furnace 42b in which the molten metal 41 was stored. If the molten metal 41 is supplied to the furnace 42b, or the heat-resistant float 48 is immersed in the molten metal 41, the height of the molten metal surface 41b is the same as the height of the electromagnetic coil 32a. The molten metal surface 41a is raised.
Japanese Unexamined Patent Publication No. 63-157762

  However, the temperature of the molten metal 41 is several hundred degrees or more, and as shown in FIG. 4A, in order to immerse the electromagnetic pump 31 in the molten metal 41, the electromagnetic pump 31 is not allowed to enter the molten metal or the molten metal. It must be protected from heat. For that purpose, it is necessary to cover the periphery of the electromagnetic pump 31 with the corresponding protective case 35, and the volume increases. Then, the furnace of the magnitude | size which can immerse the electromagnetic pump 31 in the molten metal 41 with the protective case 35 is needed, and a metal molten metal supply apparatus will be enlarged and expensive.

  The protective case 35 is generally made of ceramics and has a surface that is vulnerable to external impacts. For example, when the electromagnetic pump 31 covered with the protective case 35 is left in a room temperature environment, if the electromagnetic pump 31 is immersed in the molten metal 41 together with the protective case 35, the protective case 35 is damaged due to thermal shock. There is.

  Therefore, as shown in FIG. 4B, before the preheating equipment 34 including the heat source 33 is installed and the protective case 35 is immersed in the molten metal 41, the temperature of the protective case 35 is set to a temperature close to the molten metal in advance. When the protective case 35 is immersed in the molten metal 41, damage due to thermal shock can be prevented. However, by installing the preheating facility 34, the molten metal supply device becomes large and expensive.

  As shown in FIG.4 (c), in order to supply a new molten metal to the furnace 42b, the furnace (not shown) different from the furnace 42b for storing the new molten metal for supply is used. It is necessary to install. In addition to the installation of another furnace, it is also necessary to install a supply device (not shown) for supplying molten metal for supply to the furnace 42b. Then, the molten metal supply device is increased in size.

  Further, in order to immerse the float 48 in the molten metal 41, the furnace 42b needs to be a dedicated furnace in which the float 48 can be immersed. Furthermore, it is necessary to install an operating mechanism (not shown) for operating the float 48 in the vicinity of the dedicated furnace. Then, the molten metal supply device is increased in size. Since the dedicated furnace has low versatility and is very expensive, the price of the dedicated furnace is reflected in the price of the molten metal supply apparatus, and the molten metal supply apparatus becomes very expensive.

  Therefore, the present invention has been made in view of the problems as described above, and the object is to immerse an electromagnetic pump or the like in a molten metal stored in a furnace, or immerse a float in a molten metal. An object of the present invention is to provide a metal melt supply apparatus that is small and excellent in economic efficiency, and can supply the molten metal in the furnace to the injection means such as an injection sleeve without the need to make it.

  In order to solve the above problem, a molten metal supply apparatus according to claim 1 is a hot water supply in which one end is immersed in a molten metal stored in a furnace and the other end is connected to a molten metal injection means disposed outside the furnace. A suction means for depressurizing the inside of the hot water pipe from the other end side and sucking the molten metal toward the other end side, and a hot water pipe located outside the furnace, and is disposed around the molten metal in the hot water pipe. And detecting that the molten metal sucked by the suction means has reached the position where the propulsive force by the propelling means is applied. When the detection means and the detection means detect that the molten metal has reached the position where the propulsive force by the propulsive force applying means is applied, the suction by the suction means is stopped and the operation of the propulsive force applying means is started. To provide propulsion to molten metal Characterized in that it comprises control means for the.

  According to the first aspect of the present invention, first, the inside of the hot water supply pipe is decompressed by the suction means, and the molten metal stored in the furnace is sucked to the position where the propulsive force of the propulsive force applying means acts. Next, a propelling force is imparted to the molten metal sucked by the propelling force imparting means and supplied to the injection means. Accordingly, the molten metal can be supplied to the injection means disposed outside the furnace without immersing the propelling force applying means in the molten metal stored in the furnace. Therefore, a protective case for protecting the propelling force applying means from the intrusion of the molten metal and the heat of the molten metal becomes unnecessary. Furthermore, since it is not necessary to install a large furnace that can be immersed together with the protective case or a preheating facility for preheating the protective case, a small metal melt supply device can be obtained. Further, by downsizing the molten metal supply device, not only the price of the molten metal supply device but also its maintenance cost and operating cost can be suppressed, and a molten metal supply device with excellent economy can be obtained.

  The molten metal supply apparatus according to claim 2 includes a duct connected to the suction means and the hot water supply pipe and provided with a first on-off valve between the suction means and the hot water supply pipe, and the suction means depressurizes the inside of the duct. Then, the control means opens the first on-off valve, whereby the inside of the hot water supply pipe is decompressed and the molten metal is sucked. Thereby, the suction means can efficiently suck the molten metal stored in the furnace to the position where the propulsive force by the propulsive force applying means acts.

  According to a third aspect of the present invention, there is provided the molten metal supply apparatus including the second on-off valve in the vicinity of the other end of the hot water supply pipe, and the control means opens the second on-off valve so that the molten metal to which propulsive force is applied The molten metal is supplied to the molten metal injection means through the other end. Thereby, the inside of the hot water supply pipe can be efficiently decompressed by opening the second on-off valve when the suction means sucks the molten metal. The propulsive force applying means operates so as to keep the molten metal sucked as it is until the position where the propulsive force of the propelling force applying means acts once. Thereby, when supplying a molten metal continuously to an injection means, it is preferable that it can supply quickly and smoothly.

  According to a fourth aspect of the present invention, there is provided the molten metal supply apparatus according to claim 4, wherein the propulsive force applying means has an electromagnetic coil disposed on the outer peripheral surface of the hot water supply pipe, generates a moving magnetic field by excitation of the electromagnetic coil, It is an electromagnetic pump that flows in a direction. Thereby, an electromagnetic pump can be used as the propulsion force applying means. The electromagnetic pump is small in size and simple in structure, and can supply a large amount of molten metal to a supply means such as an injection sleeve in a single operation, thus obtaining a small and economical molten metal supply device. be able to.

  The molten metal supply apparatus according to claim 5 is characterized in that the detection means measures the molten metal surface in the hot water supply pipe of the sucked molten metal. Thereby, if the position of the molten metal surface of the molten metal sucked using a non-contact type sensor such as a laser sensor is measured, the sucked molten metal has reached the position where the propulsive force by the propulsive force applying means acts. Can be easily detected.

  According to a sixth aspect of the present invention, there is provided a molten metal supply device that measures the amount of the molten metal sucked. Thereby, if the amount of the molten metal sucked into the hot water supply pipe is measured using a flow meter or the like, it can be easily detected that the molten metal has reached the position where the propulsive force by the propulsive force applying means acts.

  According to a seventh aspect of the present invention, there is provided the molten metal supply apparatus for measuring a temperature change at a position where a propulsive force by the propulsive force applying means acts on the hot water supply pipe. As a result, if a thermocouple or the like is installed at a position where the propulsive force of the hot water supply pipe propelling force acts, and the temperature change of the hot water pipe or the surrounding environment is measured, the sucked metal melt is propelled by the propulsive force applying means. It can be easily detected that the position where the force acts is reached.

  According to an eighth aspect of the present invention, there is provided a molten metal supply device that measures an elapsed time from the start of suction of the molten metal by the suction means. Thus, if the time from the suction start of the molten metal by the suction means is measured using a timer or the like, the molten metal reaches the position where the propulsive force by the propulsive force applying means acts when a certain time has elapsed from the start of the suction. It is easy to detect that it has arrived.

  The invention described in claims 9 to 11 relates to a molten metal supply method for realizing the invention described in claims 1 to 7.

  According to a ninth aspect of the present invention, there is provided a molten metal supply method comprising a hot water supply pipe having one end immersed in a molten metal stored in a furnace and connected to the other end of a molten metal injection means disposed outside the furnace. A molten metal supply method for supplying the molten metal from the furnace to the molten metal injection means, wherein the pressure in the hot water supply pipe is reduced from the other end to suck the molten metal, And a step of applying a propulsive force toward the other end side by contact, wherein the molten metal to which the propulsive force is applied is supplied to the molten metal injection means. By this method, the molten metal can be supplied to the injection means such as the injection sleeve disposed outside the furnace without immersing the propulsive force applying means such as an electromagnetic pump in the molten metal stored in the furnace.

  The molten metal supply method according to claim 10 is characterized in that, in the step of sucking the molten metal in the hot water supply pipe, the molten metal is sucked up to a position where a propulsive force acts. By this method, it is not necessary to immerse the propelling force applying means in the molten metal, and the molten metal supply device can be reduced in size.

  In the molten metal supply method according to claim 11, in the step of imparting a propulsive force to the molten metal in the hot water supply pipe, the first propulsive force for keeping the molten metal at a position where the propulsive force acts, and the molten metal as a molten metal. One of the second propulsive forces for supplying to the injection means is applied. According to this method, when the molten metal is repeatedly supplied to the molten metal injection means, it is not necessary to operate the suction means for each supply, and the time for supplying the molten metal to the molten metal injection means can be shortened. .

  Hereinafter, the best mode for carrying out the present invention will be described.

(First embodiment)
The molten metal supply apparatus 100 in the 1st Embodiment of this invention is demonstrated using drawing. FIG. 1 is a schematic diagram showing a configuration of a molten metal supply apparatus 100 in the present embodiment.

  As shown in FIG. 1, the molten metal supply device 100 according to the present embodiment detects a hot water supply pipe 43 serving as a path of the molten metal 41, a suction blower 10 that sucks the molten metal 41, and a suction position of the molten metal 41. A laser sensor 20; an electromagnetic pump 30 for supplying the sucked molten metal 41 to the injection sleeve 47 through the hot water supply pipe 43; and a controller 40 for controlling the suction blower 10, the laser sensor 20, and the electromagnetic pump 30. It consists of

  An inlet 43 for sucking the molten metal 41 is provided at one end 43 a of the hot water supply pipe 43, and is arranged so as to be immersed in the molten metal 41 stored in the furnace 42. The other end 43b of the hot water supply pipe 43 is provided with a discharge port for discharging the molten metal 41 sucked from the one end 43a, and an injection sleeve 47 for injecting and feeding the sucked molten metal 41 to a casting machine (not shown). It is connected. A second opening / closing valve 46 is provided in the vicinity of the other end 43b. The second on-off valve 46 is closed when the molten metal 41 is sucked from the furnace 42 and is opened when the molten metal 41 is supplied to the injection sleeve 47. The furnace 42 and the hot water supply pipe 43 have a heat insulating structure, and are formed of, for example, a ceramic refractory material, and the periphery thereof is covered with a refractory heat insulating material.

  Here, one end 43 a of the hot water supply pipe 43 is disposed so as to reach the middle layer region of the molten metal 41. This is because the surface layer region of the molten metal 41 or a layer close to the surface layer may be oxidized due to the reaction of the molten metal 41 with oxygen in the atmosphere, or dust or dust may be mixed. It may not be the best state as a raw material for casting products. Moreover, the heavy metal component contained in the molten metal 41 may precipitate in the lower layer area of the molten metal 41, and it may not be the best state as a raw material for casting products. Therefore, in order to avoid suction from the surface layer region of the molten metal 41 stored in the furnace 42, a layer close to the surface layer, or a lower layer region, and suction from the middle layer region of the molten metal 41, one end 43 a of the hot water supply pipe 43 is a molten metal. 41 is arranged to reach the middle layer area.

  The suction blower 10 depressurizes the hot water supply pipe 43 and sucks the molten metal 41. By the way, in the molten metal supply apparatus 100 according to the present embodiment, as shown in FIG. 1, a duct 44 is disposed so as to connect the middle of the route of the hot water supply pipe 43 and the suction blower 10. Thus, when the suction blower 10 is operated, the inside of the duct 44 is decompressed, and the interior of the hot water supply pipe 43 is decompressed accordingly. The duct 44 is provided with a first on-off valve 45, and the first on-off valve 45 opens when the suction blower 10 is in operation. Thus, the molten metal 41 stored in the furnace 42 is sucked through the hot water supply pipe 43 to a position where the propulsive force of the electromagnetic pump 30 acts.

  The laser sensor 20 detects that the sucked metal melt 41 has reached a position where the propulsive force of the electromagnetic pump 30 acts through a glass site (not shown) provided in the upper part of the hot water supply pipe 43. Since the laser sensor 20 can detect the position of the molten metal surface of the sucked metal melt 41 in a non-contact manner, the detection operation is easy. However, on the other hand, the laser sensor 20 is a precision instrument and needs to be handled with care. Therefore, a thermocouple or a flow meter that is easy to handle can be used instead of the laser sensor 20.

  For example, by installing a thermocouple on the outer wall of the hot water supply pipe 43 and measuring the temperature change of the hot water supply pipe 43, the fact that the sucked metal molten metal 41 has reached the position where the propulsive force of the electromagnetic pump 30 is applied. Can be detected. Further, for example, by installing a flow meter near the one end 43a of the hot water supply pipe 43 and measuring the amount of the molten metal 41 sucked, the fact that the propulsive force of the electromagnetic pump 30 has been reached has been reached. Can be detected. Further, a timer may be used instead of the laser sensor 20. By measuring the time from the start of suction of the molten metal 41 with a timer, it is possible to detect that the molten metal 41 has reached the position where the propulsive force of the electromagnetic pump 30 acts after a certain time has elapsed since the start of suction. .

  Regardless of the amount of the molten metal 41 stored in the furnace 42, the electromagnetic pump 30 is disposed at a position where it is not immersed in the molten metal 41. When the laser sensor 20 detects that the sucked metal melt 41 has reached a position where the propulsive force of the electromagnetic pump 30 acts, the control unit 40 starts the operation of the electromagnetic pump 30 to suck the sucked metal. Propulsive force is applied to the molten metal 41. The molten metal 41 to which the propulsive force is applied flows toward the other end 43b and is supplied to the injection sleeve 47 from the discharge port.

  Here, the electromagnetic pump 30 generates a moving magnetic field by exciting a three-phase electromagnetic coil 30a disposed on the outer peripheral portion of the hot water supply pipe 43, thereby flowing the molten metal 41 in the hot water supply pipe 43 in the direction of the moving magnetic field. To do. The reason why the above-described suction pump 10 sucks the molten metal 41 to the position where the propulsive force of the electromagnetic pump 30 acts is due to these characteristics of the electromagnetic pump 30.

  As described above, by adopting the configuration of the present invention, the molten metal 41 in the furnace 42 is supplied to the injection sleeve 47 without immersing the electromagnetic pump 30 and the float 48 in the molten metal 41 in the furnace 42. be able to. Therefore, it is possible to obtain a molten metal supply device that is small and excellent in economy.

  FIG. 1 shows an example in which the molten metal 41 in the furnace 42 is sucked in a direction perpendicular to the ground. However, the direction in which the molten metal 41 is sucked, that is, the direction in which the hot water supply pipe 43 is installed is not limited to this. For example, the hot water supply pipe 43 may be configured to extend in a direction parallel to the ground.

  Next, the schematic operation of the molten metal supply apparatus 100 shown in FIG. 1 will be described based on the flowchart shown in FIG.

  First, in step (hereinafter abbreviated as S) 100, the second on-off valve 46 provided in the vicinity of the other end 43b of the hot water supply pipe 43 is closed. In S110, the first on-off valve 45 provided in the duct 44 is opened almost simultaneously with the closing of the second on-off valve 46 in S100.

  In S <b> 120, the suction blower 10 connected to the duct 44 is started to suck the molten metal 41 in the furnace 42 through the hot water supply pipe 43. In S <b> 130, the laser sensor 20 determines whether or not the sucked metal melt 41 has reached a position where the propulsive force of the electromagnetic pump 30 acts. In addition, when the molten metal 41 has not reached the position where the driving force of the electromagnetic pump 30 acts, the suction of the molten metal 41 by the suction blower 10 in S120 is continued.

  In S140, the first on-off valve 45 is closed in response to the suction of the molten metal 41 reaching the position where the propulsive force of the electromagnetic pump 30 acts. In S150, the operation of the suction blower 10 is stopped almost simultaneously with the closing of the first on-off valve in S140. At this time, the first on-off valve 45 and the second on-off valve 46 are closed. Therefore, even if the operation of the suction blower 10 is stopped, the sucked metal melt 41 remains at a position where the propulsive force of the electromagnetic pump 30 acts.

  In S160, the second on-off valve 46 is opened almost simultaneously with the stop of the operation of the suction blower 10 in S150. In S170, the operation of the electromagnetic pump 30 is started almost simultaneously with the opening of the second on-off valve 46 in S160. At this time, the electromagnetic pump 30 is at an output level that generates a propulsive force (first propulsive force) that can keep the sucked metal melt 41 at a position where the propulsive force of the electromagnetic pump 30 acts. The molten metal 41 is in a hot water supply standby state.

  In S180, it is determined whether or not to continue (start) the supply of the molten metal 41 to the injection sleeve 47 based on a signal from a control device that controls the operation of a casting machine (not shown). In S190, in response to the determination that the supply of the molten metal 41 to the injection sleeve 47 in S180 is not continued (started), the operation of the electromagnetic pump 30 is stopped based on the signal from the control device described above, and the molten metal is The operation of the supply device 100 is stopped.

  In S200, in response to the determination that the supply of the molten metal 41 to the injection sleeve 47 in S180 is continued (started), it is determined whether or not the supply of the molten metal 41 in the hot water supply standby state toward the injection sleeve 47 is started. . In S210, in response to the determination that the supply of the molten metal 41 in the hot water supply standby state in S200 is continued (started), the output of the electromagnetic pump 30 is increased to the molten metal supply level, and the propulsive force (second propulsion) is applied to the molten metal 41. Power). Then, supply of the molten metal 41 in the hot water supply standby state to the injection sleeve 47 is started.

  In S220, in response to the determination that the supply of the molten metal 41 in S200 is continued (started), the amount of the molten metal 41 supplied to the injection sleeve 47 is measured on the basis of time using, for example, a timer. . Note that the amount of the molten metal 41 actually supplied to the injection sleeve 47 may be measured using a flow meter. In S230, it is determined based on the supply time from the start of supply whether or not the prescribed amount of molten metal 41 has been supplied to the injection sleeve 47. If it is determined that the prescribed amount of the molten metal 41 is not supplied to the injection sleeve 47, the supply of the molten metal 41 to the injection sleeve 47 is continued.

In S240, the output of the electromagnetic pump 30 is reduced in response to the determination that the prescribed amount of the molten metal 41 in S230 has been supplied to the injection sleeve 47. In this step, the electromagnetic pump 30 continues to operate at an output that can cause the molten metal 41 to remain at a position where the propulsive force of the electromagnetic pump 30 acts. Therefore, it becomes a state equivalent to the hot water supply standby state of S170. Thereafter, steps S180 to S240 are repeated.
(Second Embodiment)
Next, the schematic operation of the molten metal supply apparatus 101 in the second embodiment will be described using the flowchart shown in FIG. In addition, since the structure of the molten metal supply apparatus 101 is the same as that of the molten metal supply apparatus 100 demonstrated in 1st Embodiment, the description is abbreviate | omitted.

  In S300, it is determined whether or not to continue (start) the supply of the molten metal 41 to the injection sleeve 47. When it is determined that the supply of the molten metal 41 to the injection sleeve 47 is not continued (started), the operation of the electromagnetic pump 30 is stopped and the operation of the molten metal supply device 101 is stopped. In S310, in response to the determination that the supply of the molten metal 41 to the injection sleeve 47 in S300 is continued (started), it is determined whether or not to start supplying the molten metal 41 stored in the furnace 41 toward the injection sleeve 47. to decide.

  In S320, the second on-off valve 46 provided in the vicinity of the other end 43b of the hot water supply pipe 43 is closed in response to the determination that the supply of the molten metal 41 in S310 is started. In S330, the first on-off valve 45 provided in the duct 44 is opened almost simultaneously with the closing of the second on-off valve 46 in S320.

  In S340, the operation of the suction blower 10 connected to the duct 44 is started, and the molten metal 41 in the furnace 42 is sucked through the hot water supply pipe 43. In S350, the laser sensor 20 determines whether or not the sucked molten metal 41 has reached a position where the driving force of the electromagnetic pump 30 acts. If the molten metal 41 has not reached the position where the propulsive force of the electromagnetic pump 30 is applied, the suction of the molten metal 41 by the electromagnetic pump 10 in S120 is continued.

  In S360, the first on-off valve 45 is closed in response to the fact that the metal melt 41 sucked in S350 has reached the position where the driving force of the electromagnetic pump 30 acts. In S370, the operation of the suction blower 10 is stopped almost simultaneously with the closing of the first on-off valve in S360. At this time, the first on-off valve 45 and the second on-off valve 46 are closed. Therefore, even if the operation of the suction blower 10 is stopped, the sucked metal melt 41 remains at a position where the propulsive force of the electromagnetic pump 30 acts.

  In S380, the second on-off valve 46 is opened almost simultaneously with the stop of the operation of the suction blower 10 in S370. In S390, almost simultaneously with the opening of the second on-off valve 46 in S380, the operation of the electromagnetic pump 30 is started, and the molten metal 41 sucked to the position where the propulsive force of the electromagnetic pump 30 acts is injected into the injection sleeve 47. Supply towards

  In S400, in response to the determination that the supply of the molten metal 41 in S310 is to be continued (started), the amount of the molten metal 41 supplied to the injection sleeve 47 is measured based on time using, for example, a timer. . Note that the amount of the molten metal 41 actually supplied to the injection sleeve 47 may be measured using a flow meter. In S410, it is determined whether or not a prescribed amount of molten metal 41 has been supplied to the injection sleeve 47. If it is determined that the prescribed amount of the molten metal 41 is not supplied to the injection sleeve 47, the supply of the molten metal 41 to the injection sleeve 47 is continued.

  In S420, the operation of the electromagnetic pump 30 is stopped in response to the determination that the prescribed amount of the molten metal 41 in S410 has been supplied to the injection sleeve 47.

  By the way, the main differences in operation between the molten metal supply device 100 in the first embodiment and the molten metal supply device 101 in the present embodiment are as follows.

  In the present embodiment, when a prescribed amount of molten metal 41 is supplied to the injection means 47 (S410), the molten metal supply device 101 once electromagnetically regardless of whether or not to continue supplying the molten metal 41 thereafter. The operation of the pump 30 is stopped (S420). On the other hand, when the specified amount of molten metal 41 is supplied to the injection sleeve 47 (S230), the molten metal supply device 100 in the first embodiment reduces the output of the electromagnetic pump 30 and continues operation in this state. . The molten metal 41 remains in a position where the propulsive force of the electromagnetic pump 30 acts, and is in a state of waiting for hot water supply to the injection sleeve 47 (S170, S240).

  Which operation is selected may be appropriately determined in consideration of the size and quantity of the cast product, the size of the furnace for storing the molten metal, and the like.

  Although the best mode for carrying out the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. is there. In the invention according to the dependent claims of the present invention, a part of the constituent features of the dependent claims can be omitted.

It is a schematic diagram which shows the structure of the molten metal supply apparatus of this invention. It is a flowchart which shows schematic operation | movement of the molten metal supply apparatus in 1st Embodiment. It is a flowchart which shows schematic operation | movement of the molten metal supply apparatus in 2nd Embodiment. It is a schematic diagram which shows the structure of the conventional molten metal supply apparatus, (a) is the molten metal supply apparatus using an immersion type electromagnetic pump, (b) is the preheating equipment used for an immersion type electromagnetic pump, (c). Is a molten metal supply device using an external electromagnetic pump

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Suction blower, 20 ... Sensor, 30, 31, 32 ... Electromagnetic pump, 30a, 31a, 32a ... Electromagnetic coil, 33 ... Heat source, 34 ... Preheating equipment, 35. ..Protective case, 40 ... control unit, 41 ... molten metal, 41a, 41b ... melt surface, 42,42a, 42b ... furnace, 43 ... hot water pipe, 43a ... hot water One end of the pipe, 43b ... the other end of the hot water supply pipe, 44 ... a duct, 45 ... a first on-off valve, 46 ... a second on-off valve, 47 ... an injection sleeve, 48 ... ·float

Claims (11)

A hot water supply pipe whose one end is immersed in the molten metal stored in the furnace and whose other end is connected to the molten metal injection means disposed outside the furnace;
A suction means for depressurizing the hot water supply pipe from the other end side and sucking the molten metal toward the other end side;
Propulsive force applying means that is disposed around the hot water pipe located outside the furnace and applies a propulsive force toward the other end side in a non-contact manner with respect to the molten metal in the hot water pipe,
Detection means for detecting that the molten metal sucked by the suction means has reached the position where the propulsive force by the propulsive force applying means is applied;
When the detection means detects that the molten metal has reached the position where the propulsive force by the propulsive force applying means is applied, the suction by the suction means is stopped and the operation of the propulsive force applying means is started. And a control means for applying a propulsive force to the molten metal. A duct connected to the suction means and the hot water supply pipe, and provided with a first on-off valve between the suction means and the hot water supply pipe;
The said suction means depressurizes the inside of the duct, and the control means opens the first on-off valve, whereby the inside of the hot water supply pipe is depressurized and the molten metal is sucked. The molten metal supply apparatus as described. A second on-off valve is provided near the other end of the hot water supply pipe,
3. The molten metal to which the propulsive force is applied is supplied to the molten metal injection means through the other end by opening the second on-off valve by the control means. The molten metal supply apparatus as described.   The propulsion force applying means is an electromagnetic pump having an electromagnetic coil arranged on the outer peripheral surface of the hot water supply pipe, generating a moving magnetic field by excitation of the electromagnetic coil, and flowing the molten metal in the direction of the moving magnetic field. The molten metal supply device according to claim 1, wherein the molten metal supply device is provided.   The molten metal supply apparatus according to any one of claims 1 to 4, wherein the detecting means measures a molten metal surface of the sucked molten metal in the hot water supply pipe.   The molten metal supply apparatus according to claim 1, wherein the detection unit measures the amount of the molten metal sucked.   The molten metal supply apparatus according to any one of claims 1 to 4, wherein the detection means measures a temperature change at a position of the hot water supply pipe where a propulsive force by the propulsive force applying means acts.   5. The molten metal supply apparatus according to claim 1, wherein the detection unit measures an elapsed time from the suction start of the molten metal by the suction unit. One end is immersed in the molten metal stored in the furnace, and provided with a hot water supply pipe connected to the molten metal injection means disposed outside the furnace, and the other end is connected to the molten metal from the furnace through the supply pipe. A molten metal supply method for supplying molten metal to injection means,
Depressurizing the hot water supply pipe from the other end side, and sucking the molten metal;
Providing the propelling force toward the other end side in a non-contact manner with respect to the sucked metal melt,
The molten metal supply method, wherein the molten metal to which the propulsive force is applied is supplied to the molten metal injection means.   The method for supplying molten metal according to claim 9, wherein in the step of sucking the molten metal in the hot water supply pipe, the molten metal is sucked to a position where the driving force acts.   In the step of applying a propulsive force to the molten metal in the hot water supply pipe, the first propulsive force for keeping the molten metal at a position where the propulsive force acts and the molten metal to supply the molten metal to the molten metal injection means. The method for supplying molten metal according to claim 10, wherein one of the second propulsive forces is applied.

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