JP2010240701A - Automatic suction feeder for molten metal and ladle for molten metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic suction feeder for a molten metal which can achieve suction feed of the molten metal without sacrificing the properties of the molten metal. <P>SOLUTION: An automatic suction feeder 1 performs suction feed of the molten metal from a melting furnace 100 to a ladle 50 for a molten metal. The automatic suction feeder 1 comprises a pipe 10 that sucks the molten metal through a suction port 10a from the melting furnace 100 and discharges the molten metal through a discharge port 10b into the molten metal ladle 50, a gas pipe 2 that is connected to the pipe 10 and introduces nitrogen gas into the pipe 10, and a vacuum pump that reduces the pressure within the molten metal ladle 50. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an apparatus for sucking and supplying a molten metal such as aluminum.

  Conventionally, in an aluminum smelting factory, molten metal such as aluminum is taken out of a melting furnace, placed in a ladle for molten metal, and transported in the factory or between factories by a forklift or the like. The molten metal such as aluminum that has been transported is molded into a predetermined shape in a molding factory.

  When supplying molten metal from a melting furnace to a ladle for molten metal, the upper lid of the molten metal ladle was opened and the molten metal was supplied into the container while being exposed to air.

  However, in recent years, a differential pressure type molten metal suction and supply technique has begun to be employed from the viewpoint of preventing oxidation of molten metal by air and ensuring safety. This is a technique for sucking and supplying molten metal from a melting furnace to a molten metal ladle using a differential pressure generated by reducing the pressure in the molten metal ladle.

  As such a differential pressure type molten metal suction supply technology, for example, there are those disclosed in Patent Documents 1 to 4.

  FIG. 13: is sectional drawing which shows the structure of the conventional ladle for molten metal. As shown in FIG. 13, the molten metal ladle 450 is provided with a large lid 470 in an upper opening 452 of a bottomed cylindrical main body 451. Further, a pipe attachment portion 454 is provided on the side surface portion of the main body portion 451. A flow path 455 in the pipe attachment portion 454 extends from an internal opening 455b provided at a position close to the bottom 453 of the main body portion 451 toward an external opening 455a provided in the upper portion of the pipe attachment portion 454. Yes. A pipe 460 is connected to the pipe attachment portion 454 so as to communicate with the flow path 455. Further, a decompression pump (not shown) is connected to the gas pipe 473 of the large lid 470 via an air hose 474.

  FIG. 14 is a diagram showing a conventional system for sucking and supplying molten metal into a differential pressure type ladle for molten metal. As shown in FIG. 14, in the molten metal suction supply system 500, a molten metal ladle 550 and a melting furnace 600 are connected by a pipe 560. As with the molten metal ladle 450, the molten metal ladle 550 includes a main body portion 551 and a large lid 570. A gas pipe 573 of the large lid 570 is connected to a decompression pump 575 via an air hose 574. Is connected. However, the molten metal ladle 550 is not provided with a pipe attachment portion on the side surface portion of the main body portion 551, and the pipe 560 passes through the large lid 570 toward a position near the bottom portion 553 of the main body portion 551. It differs from the molten metal ladle 450 in that it extends.

  The molten metal ladle 550 having such a configuration is held by the forklift 610 and can be moved up and down.

  In the molten metal suction supply system 500, the decompression pump 574 is operated to depressurize the inside of the molten metal ladle 550 and generate a differential pressure between the molten metal ladle 550 and the melting furnace 600. With this differential pressure, molten metal is sucked from the melting furnace 600 and supplied into the ladle 550 for molten metal.

  Thus, the molten metal can be safely sucked and supplied from the melting furnace 600 to the molten metal ladle 550 without exposing the molten metal to the air.

JP 2004-160539 A (released on June 10, 2004) JP 2004-188490 A (published July 8, 2004) JP 2005-262318 A (published September 29, 2005) JP 2008-155282 A (published July 10, 2008)

  However, the molten metal suction supply system as shown in FIG. 14 has the following problems.

  When sucking and supplying molten metal to the ladle for molten metal, air and moisture present in the melting furnace and the ladle for molten metal may be mixed in the molten metal that is sucked and supplied. Air and moisture mixed in the molten metal react with the molten metal to generate hydrogen and oxide. When molding using a molten metal in which hydrogen and oxide are mixed, shrinkage cavities and oxidation impurities are generated inside the molded metal, so that sufficient strength cannot be obtained. Yes.

  The above problem is conspicuous in a molded metal used under high temperature conditions such as an engine, and causes deformation and breakage.

  The present invention has been made in view of the above-described problems, and an object thereof is to automatically supply molten metal by suction from a melting furnace to a molten metal ladle without deteriorating the characteristics of the molten metal. An object of the present invention is to provide a suction supply device and a ladle for molten metal used in the suction supply device.

  In order to solve the above problems, the automatic suction supply device of the present invention is an automatic suction supply device for sucking and supplying molten metal from a melting furnace to a ladle for molten metal. A pipe for discharging the molten metal into the ladle for molten metal at the discharge port, a nitrogen introduction means for introducing nitrogen into the pipe, and the inside of the ladle for molten metal And a pressure reducing means for reducing the pressure.

  According to the above-described invention, since nitrogen introduction means is connected to the pipe, nitrogen is introduced into the pipe. The nitrogen introduced into the pipe from the nitrogen introducing means at the start of the suction of the molten metal by the pipe absorbs hydrogen and oxide in the molten metal and is sucked and removed by the pressure reducing means in the molten metal ladle. Thereby, the quantity of hydrogen and an oxide contained in the molten metal supplied to the ladle for molten metal can be reduced.

  Further, the air and moisture remaining in the molten metal ladle are sucked and removed by the decompression means along with the decompression of the molten metal ladle. For this reason, when molten metal is supplied to the ladle for molten metal, there is almost no air or moisture inside the ladle for molten metal. Thereby, mixing of the new air and water | moisture content to the molten metal supplied to the ladle for molten metal can be prevented.

  Thus, according to the said invention, a molten metal can be suction-supplied from a melting furnace to the ladle for molten metal, without deteriorating the characteristic of a molten metal.

  Moreover, in the automatic suction supply apparatus of this invention, it is preferable to provide the raising / lowering means which moves piping up and down.

  According to the above invention, since the piping and the lifting / lowering means are connected, the piping itself moves in the vertical direction in conjunction with the lifting / lowering means.

  Thereby, the operation | work which sucks and supplies a molten metal to a molten metal ladle from a melting furnace can be made safe, without raising / lowering the molten metal ladle with a forklift etc. conventionally.

  Moreover, in the automatic suction supply device of the present invention, it is preferable that the lifting means is a screw jack.

  According to the above invention, since the upper pipe and the screw jack are connected, the pipe moves in the vertical direction in conjunction with the screw jack. The screw jack is excellent in operability and durability at high temperatures.

  Thereby, a screw jack can be used suitably as a raising / lowering means to move piping up and down.

  Moreover, in the automatic suction supply device of the present invention, it is preferable that a ladle abutting portion that abuts on the molten metal ladle so as to close an opening formed in the molten metal ladle is provided on the outer periphery of the pipe. .

  According to the above invention, by bringing the ladle abutment portion into contact with the ladle for molten metal, in a state where the pipe is inserted into the opening formed in the ladle for molten metal, The pipe is connected. Moreover, the inside of the molten metal ladle can be sealed by simply bringing the ladle abutting portion into contact with the molten metal ladle, and the inside of the molten metal ladle can be easily depressurized by the decompression means.

  Thereby, since the operation | work of changing piping etc. for every ladle for molten metal is unnecessary, the connection operation time of the ladle for molten metal and piping can be shortened.

  Further, in the automatic suction supply device of the present invention, the molten metal surface detection means for detecting whether or not the molten metal surface that is the liquid surface of the molten metal supplied to the molten metal ladle has reached a predetermined position, A controller that controls the molten metal surface detecting means to stop the operation of the pressure reducing means and return the inside of the molten metal ladle to atmospheric pressure when detecting that the molten metal surface has reached a predetermined position; It is preferable to provide.

  According to the above invention, when the molten metal surface detecting means detects that the molten metal surface in the molten metal ladle has reached a predetermined position, the control unit stops the decompression in the molten metal ladle by the decompressing means. Let

  Thereby, even if there is no manual operation by an operator, it can prevent that a molten metal spouts from the ladle for molten metal.

  In addition, what is necessary is just to set the predetermined position to the height of the liquid level of the molten metal when, for example, a predetermined maximum storage amount of the molten metal is stored in the ladle for molten metal. Thereby, it can prevent supplying more than the maximum storage amount.

  Moreover, in the automatic suction supply device of the present invention, when the ladle contact portion is brought into contact with the molten metal ladle, the discharge port may be disposed at a position higher than the predetermined position. preferable.

  In the conventional differential pressure type ladle for molten metal, the outlet of the piping from the melting furnace is located near the bottom surface. This is because the molten metal supplied to the molten metal ladle is stored in the ladle for molten metal or stored in order to prevent air in the molten metal ladle from entering the ladle. This is to suppress the impact when contacting the molten metal as much as possible. As a result, when a desired amount of molten metal is supplied to the ladle for molten metal, the liquid level of the molten metal is higher than that of the discharge port. Therefore, when the inside of the ladle for molten metal is returned to atmospheric pressure, it is conceivable that the molten metal flows backward from the ladle for molten metal toward the melting furnace due to the principle of siphon. In order to prevent the backflow, in the conventional system, when air is introduced into the piping from the melting furnace to the ladle for molten metal, and the inside of the ladle for molten metal is returned to atmospheric pressure, air is introduced into the piping. Measures are taken to reduce the amount of backflow. However, since air is introduced, the characteristics of the molten metal may be deteriorated.

  On the other hand, in this invention, as above-mentioned, the nitrogen introduction means which introduce | transduces nitrogen into piping is provided. Therefore, air etc. are prevented from being mixed into the molten metal. That is, when the discharge port is arranged at a position higher than the predetermined position as in the above configuration, the molten metal supplied to the molten metal ladle is in contact with the molten metal ladle or the stored molten metal. Even if the impact is relatively large, air or the like is hardly mixed into the molten metal. And according to said structure, even if the inside of the ladle for molten metal is returned to atmospheric pressure, the backflow of the molten metal from a ladle for molten metal to a melting furnace can be prevented.

  Moreover, in the automatic suction supply device of the present invention, it is preferable that the pressure reducing means is connected to the ladle contact portion.

  According to the said invention, the pressure reduction means is connected to one ladle contact part contact | abutted to each ladle for molten metal.

  Thereby, since it is not necessary to provide the connection part of a pressure reduction means for every ladle for molten metal, simplification of the structure of the ladle for molten metal and reduction of manufacturing cost can be aimed at. Moreover, since the operation | work of changing a decompression means to the ladle for molten metal is unnecessary, work time can be shortened.

  Moreover, in the automatic suction supply apparatus of this invention, it is preferable that a ladle contact part has at least two sealing members which consist of a heat resistant material in the surface contact | abutted with the ladle for molten metal.

  According to the said invention, since the surface where the ladle contact part and the ladle for molten metal contact | abut is doubly sealed by the heat-resistant material, the ladle for molten metal can be sealed reliably.

  In the automatic suction supply device of the present invention, the pipe has a first layer and a second layer in this order toward the center of the pipe, and the first layer has thermal conductivity. Preferably, the second layer is made of a material having high thermal conductivity.

  According to the above invention, the piping is first lined with the first layer made of a material having low thermal conductivity. For this reason, the temperature fall of the molten metal by the heat radiation to the outside can be prevented. Furthermore, it is lined by the 2nd layer which consists of a material with high heat conductivity in the center direction side of piping further than the said 1st layer. For this reason, before sucking and supplying the molten metal, it is possible to shorten the preheating work time for raising the temperature in the pipe using a burner or the like.

  Thereby, the adhesion of the molten metal to the inner surface of the pipe due to the temperature drop of the molten metal can be reduced.

  It is preferable that the flange portion of the pipe has a sealing member made of a highly heat-resistant expanding material on the inside and a sealing member made of a highly durable curable material on the outside.

  According to the said invention, the inner side of the flange part of piping is sealed by the sealing member which consists of a highly heat-resistant expansion material. For this reason, the airtightness of the flange part of piping can be improved. Further, the outside of the flange portion of the pipe is sealed with a seal member made of a highly durable hardened material. For this reason, durability of the flange part of piping can be improved.

  Thereby, while preventing air from flowing in into piping from a flange part, piping can be connected reliably so that molten metal may not flow out from a flange part.

  Further, the ladle for molten metal of the present invention is the above-mentioned automatic having a ladle main body part for storing the molten metal, a circulation pipe for circulating the molten metal, and an opening part for inserting a pipe. A molten metal ladle to which molten metal is supplied by a suction supply device, and when the molten metal is supplied from the automatic suction supply device, the discharge port of the automatic suction supply device has a predetermined maximum The amount of molten metal stored in the ladle for molten metal is placed at a position higher than the predetermined position, which is the height of the liquid level of the molten metal. It is characterized by comprising ripple vibration detecting means for detecting the height of the liquid level from the ripples on the liquid level and outputting the detection result.

  According to the above invention, in the ladle for molten metal, the discharge port of the pipe is at the height of the level of the molten metal when the predetermined maximum storage amount of molten metal is stored in the ladle for molten metal. Since the molten metal is disposed at a position higher than a predetermined position, ripples are generated on the surface of the molten metal in the molten metal ladle due to the fall of the supplied molten metal. The ripple vibration detecting means can detect the height of the liquid surface of the molten metal by recognizing the ripple as vibration. Thereby, the detected height position of the liquid level can be displayed on a display device, for example. As a result, the operator can easily grasp the height of the liquid surface of the molten metal, that is, the amount of the molten metal supplied. That is, since the worker can grasp the progress of the suction supply work and the like at any time, the work efficiency can be improved.

  As described above, the automatic suction supply device of the present invention sucks the molten metal from the melting furnace at the suction port and discharges the molten metal to the molten metal ladle at the discharge port. It is connected and includes nitrogen introducing means for introducing nitrogen into the pipe and decompression means for decompressing the inside of the molten metal ladle.

  Therefore, the molten metal can be sucked and supplied from the melting furnace to the molten metal ladle without deteriorating the characteristics of the molten metal.

It is a side view which shows the whole structure of the system which sucks and supplies a molten metal from a melting furnace to the ladle for molten metal using the molten metal automatic suction supply apparatus of this embodiment. It is a side view of the automatic suction supply apparatus of the molten metal of this embodiment. It is a side view of piping with which the automatic suction supply apparatus of the molten metal of this embodiment is provided. It is a side view of the discharge port vicinity of the piping with which the automatic suction supply apparatus of the molten metal of this embodiment is provided. It is sectional drawing which shows the piping preheater used in order to preheat the piping with which the automatic suction supply apparatus of this embodiment is provided. It is an expanded sectional view of the flange part of piping with which the automatic suction supply apparatus of the molten metal of this embodiment shown in FIG. It is sectional drawing which shows the ladle contact part installed in the piping with which the automatic suction supply apparatus of the molten metal of this embodiment is provided. It is a side view which shows the screw jack with which the automatic suction supply apparatus of the molten metal of this Embodiment is provided. It is a top view which shows the ladle for molten metal of this embodiment. It is AA sectional view taken on the line of the ladle for molten metal shown in FIG. 9, and is a cross-sectional view showing a state when the ladle main body portion and the upper portion of the ladle of this embodiment are combined in a normal state. It is a top view of the ladle upper part of the ladle for molten metal of this embodiment. It is BB sectional drawing of the ladle upper part of the ladle for molten metal shown in FIG. It is sectional drawing which shows the structure of the conventional ladle for molten metal. It is a figure which shows the system which sucks and supplies a molten metal in the conventional ladle for molten metal of a differential pressure type.

  For example, an automatic suction supply device for molten metal such as aluminum, magnesium, and copper, which is an embodiment of the present invention, will be described with reference to FIGS.

  FIG. 1 is a side view showing the overall configuration of a system for sucking and supplying molten metal from a melting furnace to a ladle for molten metal using the molten metal automatic suction and supply device of the present embodiment. As shown in FIG. 1, the system for sucking and supplying molten metal according to the present embodiment includes an automatic suction supply device 1, a ladle 50 for molten metal, and a melting furnace 100. The molten metal ladle 50 and the melting furnace 100 are connected via an automatic suction supply device 1.

  The automatic suction supply device 1 uses the pressure difference between the molten metal ladle 50 and the melting furnace 100 generated by reducing the pressure inside the molten metal ladle 50 to melt the molten metal ladle 50 from the melting furnace 100. Furthermore, this is a so-called differential pressure type molten metal suction and supply device that sucks and supplies molten metal.

  The molten metal ladle 50 is for conveying the supplied molten metal, and is connected to the automatic suction supply device 1 at the upper part of the molten metal ladle 50.

  The melting furnace 100 is for melting and storing molten metal to be supplied to the molten metal ladle 50, and the temperature can be arbitrarily set depending on the type of molten metal to be stored.

  Hereinafter, the automatic suction supply device 1 will be described in detail.

  FIG. 2 is a side view of the molten metal automatic suction supply device of the present embodiment. As shown in FIG. 2, the automatic suction supply device 1 includes a pipe 10, a ladle contact portion 12, two screw jacks 20, two joint portions 25, a support portion 30, and a control portion (not shown). have.

  The pipe 10 is connected to a screw shaft 22 of a suspension type screw jack 20 via a joint portion 25. Further, the jack main body portions 21 of the two screw jacks 20 are respectively fixed to the support portion 30, and the screw shaft 22 penetrates the support portion 30 in the vertical direction.

  Accordingly, by operating the screw jack 20, the pipe 10 can be moved in the vertical direction, and the pipe 10 can be stopped at a desired height.

  FIG. 3 is a side view of the piping provided in the molten metal automatic suction supply device of the present embodiment. As shown in FIG. 3, the pipe 10 has an inverted U-shape and has a suction port 10 a and a discharge port 10 b, and the suction port 10 a is disposed at a position lower than the discharge port 10 b. . The pipe 10 sucks the molten metal from the melting furnace through the suction port 10a, and discharges the molten metal into the ladle 50 for molten metal through the discharge port 10b.

  The pipe 10 is connected to a gas pipe 2 that is a nitrogen introducing means. The gas pipe 2 is connected so that nitrogen gas supplied from a nitrogen cylinder (not shown) can be introduced into the pipe 10.

  In general, when a molten metal is sucked and supplied from a melting furnace to a molten metal ladle, air and moisture present in the melting furnace and the molten metal ladle are mixed into the sucked and supplied molten metal. The air and moisture mixed in the molten metal react with the molten metal to generate hydrogen and oxide. When molding is performed using such a molten metal in which hydrogen and oxide are mixed, shrinkage cavities and oxidation impurities are generated inside the molded metal. For this reason, there is a problem that sufficient strength cannot be obtained for the molded metal.

  Therefore, in the automatic suction supply device 1 of the present embodiment, a removable gas pipe 2 for introducing nitrogen into the pipe 10 is connected in order to remove air and moisture that deteriorate the characteristics of the molten metal. ing. The nitrogen introduced into the pipe 10 from the gas pipe 2 before the start of the suction of the molten metal by the pipe 10 absorbs hydrogen and oxide in the molten metal and is sucked and removed by the molten metal ladle 50. Thereby, the quantity of hydrogen and an oxide contained in the molten metal supplied to the ladle 50 for molten metal can be reduced.

  Further, air and moisture present inside the molten metal ladle 50 are suctioned and removed by the decompression pump as the pressure inside the molten metal ladle 50 decreases. For this reason, at the time when the molten metal is supplied to the molten metal ladle 50, there is almost no air or moisture in the molten metal ladle 50. Thereby, mixing of the new air and water | moisture content to the molten metal supplied to the ladle 50 for molten metal can be prevented.

  As described above, in the automatic suction supply device 1, by introducing nitrogen from the gas pipe 2 to the pipe 10, air and moisture mixed in the molten metal can be removed, and new air to the molten metal can be removed. Mixing of moisture can be prevented.

  Accordingly, the molten metal can be sucked and supplied from the melting furnace 100 to the molten metal ladle 50 without deteriorating the characteristics of the molten metal.

  As long as nitrogen can be introduced into the pipe 10, the connection position and connection method of the gas pipe 2 in the pipe 10 are not particularly limited.

  FIG. 4 is a side view of the vicinity of the discharge port of the pipe provided in the molten metal automatic suction supply device of the present embodiment. As shown in FIG. 4, the inner surface of the pipe 10 has a first layer 19a made of a material having a low thermal conductivity and a second layer 19b made of a material having a high thermal conductivity in the direction of the center of the pipe. Have in order. In other words, the inner circumferential surface of the pipe 10 is first lined by the first layer 19a made of a material having low thermal conductivity, and further, the upper surface of the first layer 19a (that is, the pipe of the first layer 19a). The second layer 19b made of a material having high thermal conductivity is lined on the surface on the central axis side.

  By lining the inner surface of the pipe 10 with the first layer 19a made of a material having low thermal conductivity, that is, a heat insulating material, it is possible to prevent a temperature drop of the molten metal due to heat radiation to the outside.

  In addition, by lining the inner side of the inner surface of the pipe 10 with the second layer 19b made of a material having high thermal conductivity, the temperature inside the pipe 10 can be adjusted using a burner or the like before sucking and supplying the molten metal. The preheating work time to be raised can be shortened.

  Thereby, adhesion of the molten metal to the inner surface of the pipe 10 due to a temperature drop of the molten metal can be reduced. The inner diameter of the second layer 19b is preferably 30 mm or more and 200 mm or less.

  FIG. 5 is a cross-sectional view showing a pipe preheater used for preheating pipes included in the automatic suction supply apparatus of the present embodiment. When preheating the pipe, a pipe preheater 120 as shown in FIG. 5 can be used. The pipe preheater 120 includes a combustion blower 121, and the flame from the combustion blower 121 is radiated from the upper part of the insertion pipe 125 through the combustion pipe 123 and the combustion chamber 124. The diameter of the outer periphery of the insertion pipe 125 is designed to be smaller than the diameter of the inner periphery of the pipe 10 so that the insertion pipe 125 can be inserted into the pipe 10. Further, a bottom portion 126 for receiving the molten metal fixed inside the pipe 10 is provided at the lower portion of the insertion pipe 125. The bottom portion 126 can be opened and closed by a handle 127, and the molten metal accumulated in the bottom portion 126 can be collected.

  Furthermore, as shown in FIG. 4, the pipe 10 is configured to be connected by a flange portion 16 of a plurality of pipes. FIG. 6 is an enlarged cross-sectional view of a flange portion of the pipe 10 provided in the molten metal automatic suction supply device 1 of the present embodiment shown in FIG. As shown in FIG. 6, the flange portion 16 of the pipe 10 uses a seal member 17 made of a highly heat-resistant expansion material on the inside and a seal member 18 made of a highly durable cured material on the outside. Double sealed.

  By sealing the inside of the flange portion 16 of the pipe 10 with a seal member 17 made of a highly heat-resistant expansion material, the sealing performance of the flange portion 16 of the pipe can be improved.

  Moreover, the durability of the flange portion 16 of the pipe can be improved by sealing the flange portion 16 of the pipe to the outside with a seal member 18 made of a highly durable hardened material. Accordingly, it is possible to prevent air or the like from flowing into the pipe 10 from the flange portion 16 and to reliably seal the molten metal from flowing out from the flange portion 16 to the outside.

  In the conventional differential pressure type molten metal ladle 550, as shown in FIG. 14, a pipe 560 is provided extending toward a position close to the bottom 553 of the main body 551. For this reason, when the decompression state of the molten metal ladle 550 is opened, there is a problem that the molten metal may flow backward from the molten metal ladle 550 to the melting furnace 600. In order to prevent this reverse flow, the ladle for molten metal 550 can introduce air, but measures such as weakening the sealing of the flange portion 566 of the pipe 560 to such an extent that the molten metal does not flow outside. There is a need. Therefore, since the pressure reduction efficiency inside the molten metal ladle 550 is lowered, there is a problem that the time for supplying and feeding molten metal is prolonged. In addition, there is a problem that air is introduced into the pipe 560 from the flange portion 566 of the pipe 560 and the air is mixed into the molten metal.

  On the other hand, the flange portion 16 of the pipe of the present embodiment is completely sealed by the sealing member made of two kinds of materials as described above. Thereby, since the pressure reduction efficiency inside the ladle 50 for molten metal improves, the suction supply time of molten metal can be shortened. Further, air is not introduced into the pipe 560, and mixing of air into the molten metal can be further prevented.

  FIG. 7 is a cross-sectional view showing a ladle abutting portion installed in a pipe provided in the molten metal automatic suction supply device of the present embodiment. As shown in FIG. 7, the ladle contact portion 12 includes a pressure reducing pipe connecting portion 13 and a molten metal surface detecting means 14. In addition, a through hole is formed in the central portion of the ladle contact portion 12, and the pipe 10 passes therethrough.

  The ladle contact portion 12 abuts on the upper part of the molten metal ladle 50 and is pressed from above to seal the molten metal ladle 50. For this reason, the sealing surface of the ladle contact part 12 and the ladle 50 for molten metal is doubly sealed by the seal member 19c, for example. Thereby, the ladle 50 for molten metal can be sealed completely. For the seal member 19c, for example, a heat-resistant material such as silicon can be used.

  The decompression pipe connecting portion 13 is connected to the decompression pipe 3 in order to suck the gas inside the ladle 50 for molten metal, and the other end of the decompression pipe 3 is connected to a decompression pump (not shown). Has been. By operating the vacuum pump, the inside of the molten metal ladle 50 can be decompressed, and a differential pressure can be generated between the molten metal ladle 50 and the melting furnace. By this differential pressure, the molten metal can be safely sucked and supplied from the melting furnace 100 to the ladle 50 for molten metal.

  When the ladle abutment portion 12 abuts the upper portion of the molten metal ladle 50, the molten metal surface detection means 14 is a liquid surface (hereinafter referred to as molten metal) stored in the molten metal ladle 50. In this configuration, a socket 14d in which an electrode rod 14e is inserted is attached to a plug 14a. The tip of the electrode rod 14e is disposed at a predetermined level (predetermined position) such as the molten metal surface 50s when the molten metal is full. That is, the said predetermined position respond | corresponds to the position of the liquid level of a molten metal when the molten metal of the predetermined maximum storage amount is stored in the said molten metal ladle. Thereby, the molten metal surface detection means 14 can detect whether or not the molten metal surface has reached the predetermined position.

  Although not shown in FIG. 7, by providing two or more molten metal surface detecting means 14, it is possible to reliably detect the full amount of the molten metal by detecting conduction between the electrode bars 14 e. Moreover, you may make it detect a some molten metal surface level using the several electrode rod 14e from which length differs.

  In the automatic suction supply device 1 of the present embodiment, when the molten metal surface detecting means 14 detects the full amount of the molten metal, the pressure reducing pump is controlled by a control unit (not shown) connected to the molten metal surface detecting means 14. Then, the decompressed state inside the molten metal ladle 50 is automatically released. Thereby, it can prevent that a molten metal overflows from the ladle 50 for molten metal.

  Here, as shown in FIG. 7, it is preferable that the discharge port 10b of the piping 10 inside the molten metal ladle 50 is disposed at an upper position where it is not immersed in the molten metal surface 50s when full. That is, it is preferable that the discharge port 10b is designed to be disposed at a position higher than the predetermined position.

  In the conventional differential pressure type ladle 50 for molten metal, an internal opening communicating with the pipe is disposed at a position near the bottom of the ladle body for molten metal. Due to this configuration, as described above, there is a problem that the molten metal may flow backward from the molten metal ladle 50 to the melting furnace 100 when the decompressed state of the molten metal ladle 50 is opened. is doing.

  On the other hand, in the molten metal ladle 50, the discharge port 10b of the pipe 10 is disposed at a position not immersed in the molten metal surface 50s, so that the molten metal can prevent a backflow problem.

  Further, the discharge port 10b of the pipe 10 is arranged at an upper position inside the molten metal ladle 50, so that ripples of the molten metal surface are detected on the inner side surface of the molten metal ladle 50. For this purpose, it is preferable that a ripple vibration detecting means 56 is incorporated. Since the molten metal is supplied from above into the molten metal ladle 50, ripples are generated on the molten metal surface inside the molten metal ladle 50 due to the fall of the supplied molten metal. The ripple vibration detecting means 56 is a sensor that can detect the height of the molten metal surface by recognizing the ripple as vibration. The detected height position of the molten metal surface is displayed by an external display (not shown) or the like. Thereby, the worker can grasp the progress of the suction supply work and the like, and can improve the work efficiency.

  In addition, in the automatic suction supply apparatus 1 of this embodiment, the ladle contact part 12 is installed in the piping 10, and the ladle 50 for molten metal and the pipe 10 are connected through the ladle contact part 12. Although it is a structure, it is not limited to such a structure. For example, the ladle 50 for molten metal and the piping 10 may be directly connected without using the ladle contact portion 12. For example, even if the molten metal ladle and the piping are integrated, as in a conventional molten metal ladle, nitrogen is introduced into the molten metal by connecting a gas pipe to the piping. Can do.

  Moreover, the connection part of the ladle for molten metal and piping is not limited to the upper part of the ladle for molten metal. The connection part may be, for example, the outer peripheral part of a ladle for molten metal.

  In the automatic suction supply device 1 of the present embodiment, two screw jacks 20 are used as lifting means. FIG. 8 is a side view showing a screw jack provided in the molten metal automatic suction supply device of the present embodiment. As shown in FIG. 8, the screw jack 20 includes a jack body portion 21, a screw shaft 22, a connecting shaft 23, a motor portion 24, and a joint portion 25.

  The two jack main body portions 21 are respectively fixed to a support portion 30 extending in the horizontal direction, and the screw shaft 22 extends in the vertical direction through the support portion 30 in the vertical direction.

  Further, the two jack main body portions 21 are connected by a connecting shaft 23. For this reason, the movement of the two screw jacks 20 can be interlocked.

  Furthermore, the pipe 10 is connected to the lower ends of the two screw shafts 22 via a joint portion 25.

  With such a configuration, the pipe 10 can be moved up and down by operating the motor unit 24 connected to the jack body 21.

  In the conventional molten metal suction supply system, when the molten metal is sucked and supplied from the melting furnace to the molten metal ladle, the molten metal ladle itself needs to be moved up and down by a forklift or the like. For this reason, the suction and supply work of the molten metal under an unstable condition is forced.

  On the other hand, in the automatic suction supply device 1, since the pipe 10 can be raised and lowered, it is not necessary to raise and lower the molten metal ladle 50 itself. As a result, the molten metal can be sucked and supplied more safely.

  For example, an elastic body such as a spring is built in the joint portion 25. Thereby, when making the ladle contact part 12 contact | abut on the upper part of the ladle 50 for molten metal, the ladle contact part 12 can be pressed on the upper part of the ladle 50 for molten metal from upper direction.

  Since the automatic suction supply device 1 is configured as described above, the molten metal is sucked and supplied from the melting furnace 100 to the molten metal ladle 50 safely and quickly without deteriorating the characteristics of the molten metal. Can be realized.

  Next, the ladle 50 for molten metal used for this Embodiment is demonstrated.

  FIG. 9 is a top view showing a ladle for a molten metal according to this embodiment. FIG. 10 is a cross-sectional view taken along line AA of the ladle for molten metal shown in FIG. 9, and shows the state when the ladle body portion and the upper portion of the ladle according to this embodiment are combined in a normal state. It is sectional drawing shown. As shown in FIG. 10, the molten metal ladle 50 can be separated into a ladle body 51 and a ladle upper portion 70.

The ladle main body 51 is formed in a substantially cylindrical shape, and its bottom surface is closed by a bottom wall. A space surrounded by the inner side surface and the inner bottom surface serves as a molten metal storage unit 61.
In addition, a circulation pipe 54 for circulating the molten metal is formed on the side surface of the ladle main body 51. The flow path 55 in the flow pipe 54 extends from an internal opening 55 b provided on the side surface of the storage part 61 toward an external opening 55 a provided on the upper part of the flow pipe 54.
Furthermore, the inclined surface is formed in the outer peripheral part of the bottom face of a storage part, and the adhesion at the time of molten metal discharge | emission is prevented.

  FIG. 11 is a plan view of the upper portion of the ladle of the molten metal ladle according to the present embodiment. Moreover, FIG. 12 is a BB line sectional view of the ladle upper part of the ladle for molten metal shown in FIG. As shown in FIG. 11, an opening 71 for inserting the pipe formed in the approximate center of the ladle upper portion 70 is closed by a hatch 72 to which a handle 73 is attached. At one place on the outer periphery of the hatch 72, it is attached to the upper ladle 70 via a hinge 75. For this reason, as shown in FIG. 12, the hatch 72 can be opened and closed with respect to the opening 71 of the ladle upper portion 70.

  In addition, substantially Y-shaped hatch fixing pins 76 for fixing the hatch 72 to the pan upper portion 70 are attached to two locations on the outer periphery of the hatch 72 so as to face the position where the hinge 75 is attached. ing. Thereby, the ladle 50 for molten metal can be sealed by fixing the hatch 72 to the ladle upper part 70.

  The molten metal ladle 50 is configured as described above. By using it in combination with the automatic suction supply device 1, the molten metal ladle 50 is changed from the melting furnace 100 to the molten metal ladle 50 without deteriorating the characteristics of the molten metal. It is possible to effectively and safely supply the molten metal by suction.

  In addition, in the molten metal ladle 50 of this embodiment, although it is the structure provided with one distribution pipe 54, the structure provided with two or more distribution pipes 54 may be sufficient.

  Next, melting furnace 100 in the present embodiment will be described.

  The configuration of the melting furnace 100 is not particularly limited, but includes at least a storage tank for storing the molten metal and an insertion hole for inserting the pipe 10. Since the insertion hole is normally sealed with a detachable lid, heat dissipation from the insertion hole can be prevented. On the other hand, when the molten metal is sucked from the melting furnace 100, the lid portion can be removed and the pipe 10 can be easily inserted into the insertion hole.

Moreover, the melting furnace 100 can set temperature arbitrarily with a heating means, and the temperature of the stored molten metal can be visually recognized now with a molten metal thermometer.
The system for supplying molten metal according to the present embodiment includes the automatic suction supply device 1 configured as described above, a ladle 50 for molten metal, and a melting furnace 100. Thus, the molten metal can be sucked and supplied from the melting furnace 100 to the molten metal ladle 50 while introducing nitrogen.

  Hereinafter, the procedure for sucking and supplying molten metal from the melting furnace 100 to the molten metal ladle 50 using the automatic suction supply device 1 will be described with reference to FIG.

  First, prior to sucking and supplying molten metal, the pipe 10 is preheated using the pipe preheater 120 shown in FIG. The pipe preheater 120 is placed at a predetermined position, and the screw jack 20 is operated to lower the pipe 10. The claw jack 20 is stopped at a position where the upper end of the insertion pipe 125 of the pipe preheater 120 can be inserted into the discharge port 10b of the pipe 10, and heating by the pipe preheater 120 is started. At this time, since the inner surface of the pipe 10 is lined by the second layer 19b made of a material having high thermal conductivity, the temperature inside the pipe 10 rises in a short time. For this reason, the time of preheating work can be shortened. In addition, since the metal fixed to the inner surface of the pipe 10 is dissolved by preheating the pipe 10, the clogging of the pipe 10 can be prevented. The melted metal is collected at an openable / closable bottom 126 provided at the lower portion of the insertion tube 125.

  Next, the screw jack 20 is operated to raise the preheated pipe 10, and the molten metal ladle 50 is placed at a predetermined position in place of the pipe preheater 120. The screw jack 20 is operated again to lower the pipe 10. And the position which the ladle contact part 12 with which the discharge port 10b vicinity on the outer periphery of the piping 10 is equipped can contact | abut the periphery of the opening part 71 formed in the ladle upper part 70 of the ladle 50 for molten metal Then, the clue jack 20 is stopped. At this time, the suction port 10 a of the pipe 10 is inserted from the insertion hole of the melting furnace 100 and immersed in the molten metal stored in the melting furnace 100. On the other hand, the discharge port 10 b of the pipe 10 is inserted into the molten metal ladle 50 from the opening 71 of the molten metal ladle 50. At this time, since the spring is built in the joint portion 25 that connects the pipe 10 and the screw shaft 22 of the screw jack 20, the ladle contact portion 12 is pressed toward the ladle 50 for the molten metal. . For this reason, the opening part 71 of the ladle 50 for molten metal is sealed by the ladle contact part 12. Thereby, the ladle 50 for molten metal and the melting furnace 100 can be connected by the automatic suction supply apparatus 1 in a short time.

  Next, the nitrogen cylinder connected to the pipe 10 via the gas pipe 2 and the pressure reducing pump connected to the ladle abutting portion 12 via the pressure reducing pipe 3 are operated, and the inside of the ladle 50 for the molten metal is operated. Start depressurization. At this time, air and moisture (water vapor) in the molten metal ladle 50 and the refractory material can be sucked and removed by the vacuum pump. When the pressure difference between the inside of the molten metal ladle 50 and the inside of the melting furnace 100 becomes equal to or greater than a certain level, suction of molten metal from the melting furnace 100 to the molten metal ladle 50 is started. Nitrogen is continuously introduced into the pipe 10 from the gas pipe 2 even after the molten metal suction starts. The nitrogen introduced into the pipe 10 after the start of the suction supply absorbs hydrogen and oxides generated from the air and moisture mixed in the molten metal, and is sucked by the decompression pump in the molten metal ladle 50. The hydrogen and oxide in the molten metal can be removed.

  Here, the automatic suction supply device 1 is configured so that the pressure in the molten metal ladle 50 does not reach −3 kpa 15 seconds after the suction starts, or 2.5 minutes after the suction starts. When the molten metal does not reach the full amount, the suction supply is controlled to automatically stop. Further, the amount of the molten metal supplied to the molten metal ladle 50 can be always grasped by the ripple vibration detecting means incorporated in the inner side surface of the molten metal ladle 50 and recognizing the ripples on the molten metal surface as vibration. It is like that. Furthermore, when the molten metal in the molten metal ladle 50 reaches a full amount, the molten metal surface detecting means 14 provided in the ladle contact portion 12 detects the full amount, and the suction supply is automatically stopped. So that it is controlled. These controls are all controlled by a control unit (not shown) included in the automatic suction supply device 1. Thereby, it is possible to prevent an accident such as a molten metal jet due to a system failure.

  In the automatic suction supply device 1 of the present embodiment, the discharge port 10b of the pipe 10 in the molten metal ladle 50 is the molten metal surface when the molten metal in the molten metal ladle 50 reaches the full amount. It is arranged at a higher position. For this reason, the reverse flow of the molten metal from the molten metal ladle to the melting furnace, which occurs in the conventional differential pressure type ladle for molten metal, can be eliminated.

  Finally, the screw jack 20 is operated to raise the preheated pipe 10 so that the opening 71 of the molten metal ladle 50 and the insertion hole of the melting furnace 100 are respectively hatched (not shown) and the lid. The suction supply operation is completed.

  As described above, by using the automatic suction supply device 1 of the present embodiment, the molten metal can be sucked and supplied from the melting furnace 100 to the molten metal ladle 50 without deteriorating the characteristics of the molten metal. it can.

  In addition, this invention is not limited to said embodiment, A various change is possible within the scope of the present invention. For example, in the above embodiment, the screw jack is used as the lifting means, but the invention is not particularly limited to this, and a hydraulic jack or the like can be used.

  With the automatic suction supply device of the present invention, it is possible to suction and supply molten metal by removing hydrogen and oxides generated from moisture mixed in the molten metal. Thereby, it can apply to many types of molten metal.

1 Automatic suction supply device 2 Gas pipe (nitrogen introduction means)
3 Pressure reducing pump (pressure reducing means)
DESCRIPTION OF SYMBOLS 10 Piping 10a Suction port 10b Discharge port 12 Ladle contact part 14 Molten metal surface detection means 16 Flange part 19a First layer 19b Second layer 19c Sealing member made of silicon 20 Screw jack (elevating means)
DESCRIPTION OF SYMBOLS 50 Ladle for molten metal 51 Ladle main-body part 54 Distribution pipe 56 Ripple vibration detection means 71 Opening part 100 Melting furnace

Claims (11)

An automatic suction supply device for sucking and supplying molten metal from a melting furnace to a ladle for molten metal,
A pipe for sucking molten metal from the melting furnace at the suction port and discharging the molten metal into the ladle for molten metal at the discharge port;
A nitrogen introduction means connected to the pipe and for introducing nitrogen into the pipe;
An automatic suction supply device, comprising: a decompression means for decompressing the inside of the ladle for molten metal.   The automatic suction supply apparatus according to claim 1, further comprising lifting means for moving the pipe in the vertical direction.   3. The automatic suction supply apparatus according to claim 2, wherein the elevating means is a screw jack.   The ladle contact part which contact | abuts the said ladle for molten metal so that the opening part formed in the said ladle for molten metal may be block | closed on the outer periphery of the said piping is provided. The automatic suction supply device according to any one of the above. Molten metal surface detection means for detecting whether or not the molten metal surface that is the liquid surface of the molten metal supplied to the molten metal ladle has reached a predetermined position;
A controller that controls the molten metal surface detecting means to stop the operation of the pressure reducing means and return the inside of the molten metal ladle to atmospheric pressure when detecting that the molten metal surface has reached a predetermined position; ,
The automatic suction supply apparatus according to claim 4, further comprising:   6. The automatic suction according to claim 5, wherein when the ladle abutting portion is abutted against the molten metal ladle, the discharge port is disposed at a position higher than the predetermined position. Feeding device.   The automatic suction supply apparatus according to any one of claims 4 to 6, wherein the decompression means is connected to the ladle contact portion.   The automatic suction according to any one of claims 4 to 7, wherein the ladle abutting portion has at least two sealing members made of a heat-resistant material on a surface that abuts on the ladle for molten metal. Feeding device. The piping has a first layer and a second layer in this order toward the center of the piping,
The first layer is made of a material having low thermal conductivity,
The second layer is made of a material having high thermal conductivity.
The automatic suction supply device according to any one of claims 1 to 8, wherein   The flange portion of the pipe has a seal member made of a highly heat-resistant expanding material on the inside and a seal member made of a highly durable hardened material on the outside. The automatic suction supply device according to item. The molten metal is supplied by the automatic suction supply device according to claim 1, comprising a ladle body for storing the molten metal, a flow pipe for circulating the molten metal, and an opening for inserting the pipe. A ladle for molten metal,
When the molten metal is supplied from the automatic suction supply device, the discharge port of the automatic suction supply device is a molten metal when a predetermined maximum storage amount of the molten metal is stored in the ladle for molten metal. It is arranged at a position higher than the predetermined position that is the height of the liquid level of
A ladle for molten metal comprising a ripple vibration detecting means for detecting the height of the liquid surface by the ripples on the surface of the molten metal inside the ladle body, and outputting the detection result.

Images