JP2005024212A - Metal melting and holding furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal melting and holding furnace capable of preventing the lowering of the temperature of a molten metal in a discharged molten metal chamber caused by the flowing of the molten metal of a low temperature into the discharged molten metal chamber having an intake port. <P>SOLUTION: This metal melting and holding furnace 1 is provided with a melting chamber 5 for melting a metallic material 3, a holding chamber 9 for holding the molten metal obtained by melting the metallic material 3 at a specific high temperature, and a discharged molten metal chamber 13 comprising the intake port 11 for taking out the molten metal. This metal melting and holding furnace is provided with a weir wall 39 for inhibiting the flowing-out of the molten metal of low temperature at a lower layer part in the holding chamber 9 into the discharged molten metal chamber 13, and a partitioning wall 35 between the holding chamber 9 and the discharged molten metal chamber 11 is provided with a vertically movable partition 45 capable of being come in and out into the molten metal at its lower end part. A weir mechanism 25 is provided between the melting chamber 5 and the holding chamber 9 for preventing the flowing-in of unmelted material into the holding chamber 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a metal melting and holding furnace that melts and holds a metal material such as aluminum, for example, and more specifically, in a carry-out hot water chamber provided with a drawing port for drawing a molten metal in which the metal material is dissolved. The present invention relates to a metal melting and holding furnace capable of constantly maintaining the temperature of a molten metal at a stable and high temperature.

  Conventionally, a metal melting and holding furnace for holding a molten metal to be supplied to a die casting machine at a constant high temperature includes a melting chamber for melting a metal material such as aluminum and a molten metal in which the metal material is dissolved. The structure provided with the holding | maintenance chamber hold | maintained at the high temperature of this, and the unloading hot water chamber provided with the drawing-out port for drawing up the said molten metal is common.

  In the conventional configuration as described above, the inflow of the molten metal into the holding chamber is often a semi-molten metal material, a low-temperature molten metal immediately after melting, and a layer of a low-temperature molten metal is formed at the bottom of the holding chamber. Tend to form. When the molten metal is pumped from the outlet of the carry-out hot water chamber communicating with the holding chamber, the low-temperature molten metal at the bottom of the holding chamber flows into the carry-out hot water chamber, and the temperature of the molten metal in the carry-out hot water chamber is reduced. It may be lowered and the cleanliness of the molten metal may be lowered.

In view of this, in order to prevent the low-temperature molten metal in the holding chamber from flowing linearly into the carry-out hot water chamber, a filter is provided between the holding chamber and the carry-out hot water chamber. Have been proposed (see, for example, Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 2-97890 JP 2002-178137 A

  In the configuration disclosed in Patent Document 1, a plurality of submerged banks are provided at the bottom of the holding chamber, and a circulation port is provided in each submerged bank in a staggered pattern, so that the molten metal at the bottom of the holding chamber flows along the submerged bank. Thus, the configuration meanders. Therefore, although the low-temperature molten metal is heated to some extent while meandering the bottom of the holding chamber, it cannot prevent the low-temperature molten metal at the bottom from flowing into the carry-out hot water chamber. May flow into the carry-out hot water chamber and lower the temperature of the molten metal in the carry-out hot water chamber.

  In the configuration described in Patent Document 2, since the partition wall provided with the fireproof filter portion is provided between the holding chamber and the carry-out hot water chamber, the low-temperature molten metal at the bottom in the hold chamber enters the carry-out greenhouse. Inflow can be prevented and foreign matters floating on the surface of the molten metal can be removed. However, the provision of the partition wall causes a large temperature difference between the holding chamber and the carry-out hot water chamber. Therefore, it is necessary to maintain the temperature in the holding chamber in a high-temperature heating state more than necessary. There are problems such as increased consumption, easy generation of oxides, and faster refractory pain in the furnace.

  The present invention has been made in view of the conventional problems as described above, and includes a melting chamber for melting a metal material, a holding chamber for holding the molten metal melted at a predetermined high temperature, and the molten metal. A metal melting and holding furnace comprising a carry-out hot water chamber provided with a draw-out port for drawing, and a weir wall for preventing the low-temperature molten metal in the lower layer in the hold chamber from flowing into the carry-out hot water chamber It is the structure provided with.

  In the metal melting and holding furnace, the present invention is configured such that the partition wall between the holding chamber and the carry-out hot water chamber is provided with a partition plate whose lower end portion can be immersed in the molten metal so as to be movable up and down. .

  In the metal melting and holding furnace, the present invention is provided with a weir mechanism for preventing an undissolved material from flowing into the holding chamber between the melting chamber and the holding chamber.

  Further, the present invention is the metal melting and holding furnace, wherein the dam wall is provided in the holding chamber, and prevents the low-temperature molten metal and the medium-temperature molten metal in the holding chamber from flowing into the discharge hot water chamber. The holding chamber is divided into a temperature raising chamber and a high temperature holding chamber by the dam wall.

  As can be understood from the above description, according to the present invention, it is possible to prevent the low-temperature molten metal immediately after being melted in the melting chamber from flowing into the carrying-out hot water chamber provided with the intake port. The temperature of the molten metal in the room can be prevented from lowering, and the conventional problems as described above can be solved.

  Referring to FIG. 1, a metal melting and holding furnace 1 according to an embodiment of the present invention is a melting chamber for melting a metal material 3 such as aluminum as in a conventional general metal melting and holding furnace. 5, a holding chamber 9 for holding the molten metal 7 in which the metal material 3 is melted at a predetermined high temperature, and a carry-out hot water chamber 13 having a drawing port 11 for drawing the molten metal 7. is there.

  More specifically, the metal melting and holding furnace 1 is constituted by a fire wall member 15, and a partition wall 17 is provided between the melting chamber 5 and the holding chamber 9 so as to hang slightly downward from the ceiling. The melting chamber 5 and the holding chamber 9 are partitioned by the partition wall 17.

  The melting chamber 5 is provided with a charging port 19 for charging the metal material 3 and the floor 21 of the melting chamber 5 is slightly inclined so that the holding chamber 9 side is lowered. A burner 23 for melting the metal material 3 in the melting chamber 5 is provided on an appropriate wall portion such as a ceiling of the melting chamber 5.

  Further, a weir mechanism for preventing undissolved (semi-molten) undissolved material in the melting chamber 5 from flowing into the holding chamber 9 between the melting chamber 5 and the holding chamber 9. 25 is provided.

  That is, the floor portion 21A on the holding chamber 9 side of the floor portion 21 in the melting chamber 5 is formed one step lower than the floor portion 21B that supports the metal material 3, and the floor portion 21A and the floor portion 21B are formed. The connecting portion is formed on an inclined surface. A weir 29 is provided on the upper surface of the floor portion 21A on the holding chamber 9 side for forming a hot water reservoir 27 for temporarily storing a low-temperature molten metal in which the metal material 3 is dissolved.

  Further, in the melting chamber 5, the metal material 3 on the floor portion 21B is prevented from moving directly to the floor portion 21A side in the vicinity of the connection portion between the floor portion 21A and the floor portion 21B. A partition member 31 is provided. The partition member 31 is formed with a transmission part 31A such as a slit or a hole through which a flame from the holding burner 33 for holding the molten metal 7 in the holding chamber 9 at a high temperature and hot air can pass. The lower part (lower surface) 31B of the partition member 31 is provided slightly lower than the upper part (upper surface) 29A of the weir 29 so as to be slightly immersed from the upper surface of the molten metal in the hot water reservoir 27.

  With the above configuration, the metal material 3 charged into the melting chamber 5 from the charging port 19 is deposited on the floor portion 21B of the melting chamber 5 and is sprayed from the burner 23 onto the metal material 3 in the melting chamber 5. The metal material 3 is melted by the fire. The low-temperature molten metal immediately after melting passes through the lower side of the partition member 31 and flows into the hot water reservoir 27 to be temporarily stored.

  The holding chamber 9 is partitioned from the melting chamber 5 by the partition wall 17 and the weir 29 positioned below the partition wall 17, and the holding chamber 9 and the carry-out hot water chamber 13 are lower surfaces (lower portions). The partition wall 35 is defined as a partition wall in a state where 35A is in contact with the upper surface of the molten metal 7 in the holding chamber 9 or the lower surface 35A is slightly immersed from the upper surface of the molten metal 7. The drawing port 11 of the carry-out hot water chamber 13 is provided between the standing wall portion 37 provided apart from the partition wall 35 and the partition wall 35. Here, the upper surface (upper part) 37 </ b> A of the standing wall part 37 is provided at a higher position than the lower surface 35 </ b> A of the partition wall 35.

  The floor portion 9A in the holding chamber 9 and the floor portion 13A of the carry-out hot water chamber 13 are formed in a plane that is horizontally continuous with each other, and the floor portion 9A of the holding chamber 9 includes the inside of the holding chamber 9. A dam wall 39 is provided to prevent the low-temperature molten metal in the lower layer from flowing into the unloaded molten metal chamber 13. The holding burner 33 is provided on the ceiling portion of the holding chamber 9.

  An appropriate actuator 41 such as an air cylinder is provided on the partition wall 35 as a partition wall, and a lower end portion is provided at a lower portion of an operating rod 43 such as a piston rod provided on the actuator 41 so as to be movable up and down. A partition plate 45 is provided that can be immersed from the upper surface of the molten metal 7. In order to adjust the vertical position of the partition plate 45, an upper surface detection sensor 47 for detecting the upper surface of the molten metal 7 is provided.

  As the upper surface detection sensor 47, for example, an appropriate sensor such as a distance sensor that detects the distance from the upper surface detection sensor 47 to the upper surface of the molten metal 7 or a contact sensor that can freely contact the upper surface of the molten metal 7 is employed. Can do.

  The upper surface detection sensor 47 keeps the lower end portion of the partition plate 45 always in contact with the upper surface of the molten metal 7 or the lower end portion of the partition plate 45 is always immersed in a predetermined amount from the upper surface of the molten metal 7. It is used for Therefore, for example, the upper surface detection sensor 47 is provided integrally with the partition plate 45 or the operating rod 43 at a desired height position from the lower end of the partition plate 45, and the upper surface detection sensor 47 and the upper surface of the molten metal 7 are provided. When the distance between them is a preset value, the lower end portion of the partition plate 45 is configured to be in a state where a predetermined amount is immersed from the upper surface of the molten metal 7.

  Then, the actuator 41 is controlled and driven by a control device (not shown) based on the detection of the upper surface detection sensor 47, and the distance between the upper surface position detection sensor 47 and the upper surface of the molten metal 7 is always kept constant. As a result, even when the upper surface of the molten metal 7 fluctuates up and down, the lower end portion of the partition plate 45 can be held in a state in which a fixed amount is always immersed from the upper surface of the molten metal 7.

  In the configuration as described above, as described above, the metal material 3 is charged into the melting chamber 5 to be melted, and the molten metal 7 in the holding chamber 9 is held at a high temperature by the flame sprayed from the holding burner 33, and is taken out. The hot molten metal 7 is taken out from the drawing port 11 of the hot water chamber 13 and supplied to a die casting machine (not shown).

  In the above-described configuration, as described above, the metal material 3 in the melting chamber 5 is melted by the flame and hot air blown from the burner 23, and the low temperature molten metal immediately after melting flows into the bottom side of the hot water reservoir 27. Stored temporarily. The molten metal in the hot water reservoir 27 is gradually pushed up by the low-temperature molten metal flowing into the bottom, and flows into the holding chamber 9 over the weir 29.

  At this time, the upper surface of the hot water reservoir 27 is heated by hot air from the holding burner 33 flowing as indicated by an arrow A, for example. Moreover, the metal material 3 in the melting chamber 5 is also heated by the hot air. Therefore, the exhaust heat of the holding burner 33 for heating the molten metal 7 in the holding chamber 9 can be used effectively, and the low-temperature molten metal immediately after being melted in the melting chamber 5 is directly in the holding chamber 9. It is possible to prevent inflow.

  Although the molten metal flowing into the holding chamber 9 is heated by the exhaust heat of the holding burner 33 when it passes over the weir 29 from the hot water reservoir 27, it is not sufficiently high in temperature. It will collect at the bottom. The floor portion 9A in the holding chamber 9 is provided with a dam wall 39 so that the low-temperature molten metal at the bottom in the holding chamber 9 does not flow into the carry-out hot water chamber 13, so that the low-temperature molten metal is discharged into the carry-out hot water. It does not flow into the chamber 13 and lower the temperature of the molten metal 7 in the carry-out hot water chamber, and can solve the conventional problems as described above.

  In the holding chamber 9, the molten metal 7 held at a high temperature by the heating by the holding burner 33 flows into the unloading hot water chamber 13 every time the molten metal 7 is taken out from the drawing port 11 of the unloading hot water chamber 13. It is. At this time, since the partition plate 45 is always in contact with the upper surface of the molten metal 7 or slightly submerged from the upper surface of the molten metal 7, the floating material on the upper surface of the molten metal 7 flows into the carry-out hot water chamber 13. Can be prevented.

  Moreover, according to the said structure, when the molten metal 7 is taken out from the draw-out port 11 of the carry-out hot water chamber 13, the hot molten metal 7 of the upper layer part in the holding chamber 9 flows into the carry-out hot water chamber 13 without resistance. The temperature difference between the drawing port 11 and the molten metal 7 in the holding chamber 9 is small, and it is not necessary to heat the molten metal 7 in the holding chamber 9 at an unnecessarily high temperature, which saves energy and saves the refractory and the entire furnace body. This will extend the service life.

  FIG. 2 shows a second embodiment, and the same reference numerals are given to components having the same functions as those of the above-described embodiment, and redundant description is omitted.

  In the second embodiment, the dam 29, the partition member 31, and the upper surface detection sensor 47 in the first embodiment described above are omitted, and the dam wall 39 is disposed at substantially the center of the holding chamber 9. In addition, the height of the dam wall 39 is high enough to prevent the low temperature molten metal that forms the lower temperature layer in the holding chamber 9 and the intermediate temperature molten metal that forms the middle temperature layer above it from flowing into the discharge hot water chamber 13. It is provided. In other words, the dam wall 39 is provided at a height that allows only the flow of the high-temperature molten metal 7 forming the upper high-temperature layer in the holding chamber 9. It is partitioned into a holding chamber 9C.

  Since the upper surface detection sensor 47 is omitted in the above configuration, it is difficult to adjust the vertical position of the partition plate 45 with respect to the change in the upper surface of the molten metal 7, so the partition plate 45 is fixed to the partition wall 35. A configuration is also possible.

  With the above configuration, the low-temperature molten metal immediately after melting flowing into the holding chamber 9 from the melting chamber 5 or the intermediate-temperature molten metal heated to some extent flows into the bottom side of the temperature rising chamber 9B of the holding chamber 9 because of the specific gravity. The dam wall 39 impedes the flow in the direction of the carry-out hot water chamber 13. When the temperature gradually rises beyond the dam wall 39, the temperature gradually rises due to heating and heat transfer by the holding burner 33, and flows to the high temperature holding chamber 9C side in the high temperature state. In this case, the holding burner 33 is held at an appropriate high temperature.

  Since the molten metal 7 flowing into the high temperature holding chamber 9C from the temperature raising chamber 9B is at a high temperature and is held at a high temperature by the action of the holding burner 33, the entire molten metal 7 from the high temperature holding chamber 9C to the carry-out hot water chamber 13 is It will be held at a high temperature, and the temperature of the molten metal in the carry-out hot water chamber 13 will not be lowered, and the same effect as described above can be obtained.

  In addition, although the case where aluminum was used as the metal material was illustrated, the metal material is not limited to aluminum, and can be applied to a similar metal material.

1 is a cross-sectional explanatory view conceptually and schematically showing a metal melting and holding furnace according to a first embodiment of the present invention. It is sectional explanatory drawing which showed notionally and schematically the metal melting | dissolving holding furnace which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Metal melting holding furnace 3 ... Metal material 5 ... Melting chamber 7 ... Molten metal 9 ... Holding chamber 9A ... Floor part 9B ... Temperature rising chamber 9C ... High temperature holding chamber 11 ... Draw-out port 13 ... Unloading hot water chamber 17 ... Partition wall 19 ... Input Mouth 23 ... Burner 25 ... Weir mechanism 27 ... Hot water reservoir 29 ... Weir 31 ... Partition member 33 ... Holding burner 35 ... Partition wall (partition wall)
37 ... Standing wall portion 39 ... Dam wall 45 ... Partition plate 47 ... Upper surface detection sensor

Claims (4)

A metal comprising a melting chamber for melting a metal material, a holding chamber for holding the molten metal melted at a predetermined high temperature, and a carry-out hot water chamber having a pumping port for pumping the molten metal A melting and holding furnace, comprising a dam wall for preventing a low-temperature molten metal in a lower layer in the holding chamber from flowing into the carry-out hot water chamber. The metal melting and holding furnace according to claim 1, wherein a partition plate between the holding chamber and the carry-out hot water chamber is provided with a partition plate whose lower end portion can be immersed in the molten metal so as to be movable up and down. Metal melting and holding furnace. The metal melting and holding furnace according to claim 1 or 2, further comprising a weir mechanism between the melting chamber and the holding chamber for preventing inflow of undissolved material into the holding chamber. Metal melting and holding furnace. 3. The metal melting and holding furnace according to claim 1, wherein the dam wall is provided in the holding chamber and has a height that prevents the low-temperature molten metal and the middle-temperature molten metal in the holding chamber from flowing into the carry-out hot water chamber. There is provided a metal melting and holding furnace characterized in that the holding chamber is divided into a heating chamber and a high temperature holding chamber by the dam wall.

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