JP5261332B2 - melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a melting furnace capable of remarkably improving workability in disposing a gate, and easily performing maintenance such as replacement. <P>SOLUTION: The melting furnace 1 includes a furnace body 2, and the gate 3 for leading out molten metal from a melting chamber 4 disposed in the furnace body 2. A guide groove 8 for guiding the molten metal in the melting chamber 4 to the lead-out direction is formed on the gate 3, and the gate 3 is formed into the block shape separately from the furnace body 2. The furnace body 2 is provided with a retaining member 12 for detachably retaining the gate 3. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a melting furnace for melting metal.

  Conventionally, this type of melting furnace is provided with a gate for extracting the molten metal melted in the melting chamber provided in the furnace body to the outside of the furnace (for example, see Patent Document 1 below). The gate is extended outward from a part of the upper end of the melting chamber, and a guide groove for guiding the molten metal in the outlet direction is formed. Then, the molten metal in the melting chamber is led out along the guide groove of the gate by tilting the furnace body. At this time, in order to prevent the molten metal from jumping out from the melting chamber of the tilted furnace body, the gate is provided in a posture in which it is inclined upward toward the tip.

  The gate is made of castable cement and has heat resistance against the temperature of the metal melted in the melting chamber. For example, the gate is formed as follows. That is, castable cement is poured into a mold attached to the furnace body to make it into a pouring gate shape. Castable cement is a hydraulic cement mainly composed of aluminum oxide. It is kneaded with about 12% water and poured into a mold.

Japanese Patent Laid-Open No. 9-303969

  However, the construction of the gate is generally performed with the furnace body upright, and the gate is provided in a posture that is inclined upward toward the tip as described above (that is, not in a horizontal posture). Therefore, when the castable cement has high fluidity, it is difficult to construct in an inclined shape.

  Therefore, it is conceivable to lower the fluidity by kneading castable cement with relatively little water, but the castable cement that has decreased fluidity by reducing the amount of water has a markedly reduced strength after drying and solidification. .

  Further, when a hot melt with a castable cement is led out of a hot melt in a state where drying is insufficient, there is a risk that the internal moisture will rapidly evaporate and break. Furthermore, even if the pouring gate made of castable cement is sufficiently dried, the temperature difference between the surface and the inside increases due to the molten metal that is derived, and spalling such as cracks and surface peeling occurs. For this reason, it is necessary to preheat the gate prior to derivation of the molten metal, which is inconvenient. In addition, the slag that is an oxide easily adheres to the pouring gate made of castable cement as the molten metal is led out, and it is necessary to remove the slag. is there.

  And since the durability of the gate is relatively low as described above, not only the damaged gate has to be reconstructed frequently, but also the gate is provided integrally with the furnace body. Reconstruction must be performed at the same time as the relining of the refractory material on the furnace body side.

  In view of the above points, an object of the present invention is to provide a melting furnace capable of dramatically improving workability when providing a gate and facilitating maintenance such as replacement.

The present invention includes a furnace body provided with a bottomed cylindrical melting chamber for melting metal, and a pouring gate provided at the upper end portion of the furnace body for leading out the molten metal in the melting chamber by tilting the furnace body. In the furnace,
The gate is provided with a guide groove that guides the molten metal in the melting chamber in the outlet direction, and is formed in a block shape that is separate from the furnace body,
The furnace body includes a holding member that detachably holds the gate and fastening means that releasably fastens the block-shaped gate to the holding member,
The holding member includes a holding bottom portion fixed obliquely upward from a top plate that closes an upper portion around the dissolution chamber, a side wall portion that stands on both sides of the holding bottom portion, and a tip wall that stands on the tip end. And
The fastening means has a contact plate that projects between the side wall portions and contacts the top surface of the top of the gate, and a pressure contact bolt that is screwed into and penetrates the contact plate.
The contact plate is connected to both the side wall and the tip wall .

  According to the present invention, a melting furnace in which the gate is integrally provided in the furnace body is configured by holding the block-shaped gate in the holding member provided in the furnace body. Thus, by making it possible to hold the block-shaped gate in the holding member, the block-shaped gate can be formed separately from the furnace body, and hydraulic cement is applied to the mold of the furnace body. The gate can be provided in the furnace body very easily as compared with the operation of forming the gate by pouring. In addition, by holding the gate in a detachable manner by the holding member, it is only necessary to replace the gate even if the gate is damaged, and the workability during maintenance can be greatly improved.

  At this time, it is preferable that the holding member includes fastening means for releasably fastening the block-shaped gate to the holding member. By the fastening means provided in the holding member, the gate can be securely fixed to the furnace body, and the gate can be removed and replaced smoothly from the furnace body simply by releasing the fastening.

  Moreover, the durability of the gate can be improved by forming the block-shaped gate with a material mainly composed of silicon carbide. That is, since the main component of the gate is silicon carbide, moisture is extremely less than that of castable cement, and breakage due to evaporation of moisture when the heat of the molten metal is received can be prevented. Moreover, the temperature difference between the surface and the inside when the molten metal is led out is small, and preheating is unnecessary. In addition, the sprue mainly composed of silicon carbide is difficult for slag to adhere when the molten metal is led out, and the labor for removing the slag can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory longitudinal cross-sectional view which shows the melting furnace of embodiment of this invention. Explanatory top view of the principal part of the melting furnace of this embodiment. (A) is a top view which shows the gate in this embodiment, (b) is a side view of (a). The top view of the principal part of other embodiment. Sectional drawing of the principal part of other embodiment.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the melting furnace 1 of the present embodiment includes a furnace body 2 and a gate 3. The furnace body 2 includes a bottomed cylindrical melting chamber 4 having an open top, a cylindrical coil cement 5 provided on the outer periphery of the melting chamber 4, and an induction coil wound around the outer periphery of the coil cement 5. 6 and a main body frame 7 for housing them.

  As shown in FIGS. 1 and 2, the gate 3 is provided at the upper end of the furnace body 2. As shown in FIGS. 3A and 3B, the gate 3 is formed in a block shape and is manufactured separately from the furnace body 2. A guide groove 8 for guiding the molten metal from the melting chamber 4 in the outlet direction is formed in the gate 3. The guide groove 8 is formed in a shape that gradually narrows toward the tip of the gate 3, and improves the derivation accuracy by converging the molten metal flowing out from the tip.

  Moreover, the block-shaped gate 3 is baked at about 1000-1300 degreeC using the material which has silicon carbide as a main component, and is baked and solidified in the shape of the gate 3. In the present embodiment, the main components of the material of the gate 3 are 85.5% silicon carbide, 9.6% alumina (aluminum oxide), and 2.1% silica (silicon dioxide). Other than that, it contains carbon as a trace component.

  Next, the holding structure of the gate 3 in the furnace body 2 will be described in detail. As shown in FIG. 1, the main body frame 7 of the furnace body 2 closes a metal support plate 10 that supports a peripheral block 9 provided on the outer periphery of the upper end of the melting chamber 4 and an upper portion around the melting chamber 4. A top plate 11 is provided. A holding member 12 for holding the gate 3 is connected to an attachment position of the gate 3 on the top plate 11.

As shown in FIGS. 1 and 2, the holding member 12 is formed of a metal plate material, is inclined obliquely upward, and stands on both sides of the holding bottom portion 13. The holding bottom portion 13 is fixed to the top plate 11. The side wall part 14 and the front-end | tip wall part 15 which stands up at the front-end | tip are provided. Further, the holding member 12 includes a contact plate 16 that projects between the side wall portions 14 and contacts the upper surface of the tip end of the gate 3, and the contact plate 16 is screwed into the contact plate 16 and penetrates through the pressure contact bolt. 17 is provided. The contact plate 16 and the pressure contact bolt 17 constitute the fastening means of the present invention.

  The gate 3 is held by a holding member 12 and is fixed by pressure contact with a pressure contact bolt 17. At this time, the base end portion of the gate 3 is connected to the connection wall portion 18 formed in a part of the peripheral block 9 without a gap.

  When the gate 3 is held by the holding member 12, first, the tip of the gate 3 is brought into contact with the tip wall 15 so as to be slid under the contact plate 16 of the holding member 12. The base end portion is lowered while being brought into sliding contact with the connection wall portion 18, and the entire gate 3 is accommodated in the holding member 12. Thereafter, the gate 3 is fixed to the holding member 12 by tightening the pressure contact bolt 17.

  By attaching the gate 3 to the furnace body 2 in this way, the construction work of the gate 3 can be drastically reduced as compared with the case of casting castable cement as in the prior art. Further, since the gate 3 is fixed to the holding member 12 by the pressure contact bolts 17, the fixed state of the gate 3 can be reliably maintained, and the fixed state of the gate 3 can be easily released, and the gate 3 Maintenance such as replacement work can be performed very easily and quickly.

  Further, as described above, since the block-shaped gate 3 is formed of a material mainly composed of silicon carbide, high durability can be obtained, and preheating is unnecessary. Although not shown, when a molten metal outlet (for example, a ladle or a mold) is located at a position away from the gate 3 attached to the furnace body 2, the inclined gate 1 of the melting furnace 1 is inclined. Although a bowl-shaped extension gate is installed between the tip position and the lead-out destination, a material mainly composed of silicon carbide can also be used for this extension gate, so that preheating is unnecessary as with the gate 3. High durability can be obtained.

  In the above-described embodiment, a configuration in which the pressure contact bolt 17 is provided on the contact plate 16 as the fastening means is shown. However, the fastening means of the present invention is not limited to this, for example, although not shown, the holding member 12 It is possible to provide pressure welding bolts that pass through the side wall portions 14 standing on both sides of the gate and to be held and fixed from the lateral direction of the gate 3, or to provide a clamp mechanism or the like on the holding member 12 to fix the gate 3. You may employ | adopt the structure to hold down.

  Moreover, in the said embodiment, although the example which provided the fastening means in the holding member 12 was shown, the holding member 12 can be comprised without providing a fastening means, and a structure can be simplified. In this case, as shown in FIG. 4, it is possible to form both the gate 3 and the holding member 12 in a plan view shape gradually narrowing toward the tip. Other than that, as shown in FIG. 5, it is possible to form both the gate 3 and the holding member 12 in a cross-sectional view shape that becomes gradually narrower upward. By adopting these configurations, the configuration of the holding member 12 can be simplified, and the gate 3 can be held in a state in which the falling from the holding member 12 is prevented.

  DESCRIPTION OF SYMBOLS 1 ... Melting furnace, 2 ... Furnace main body, 3 ... Pouring gate, 4 ... Melting chamber, 8 ... Guide groove, 12 ... Holding member, 16 ... Contacting plate (fastening means), 17 ... Pressure welding bolt (fastening means)

Claims (2)

In a melting furnace comprising a furnace body provided with a bottomed cylindrical melting chamber for melting metal, and a gate that is provided at the upper end portion of the furnace body and leads the molten metal in the melting chamber by tilting the furnace body,
The gate is provided with a guide groove that guides the molten metal in the melting chamber in the outlet direction, and is formed in a block shape that is separate from the furnace body,
The furnace body includes a holding member that detachably holds the gate and fastening means that releasably fastens the block-shaped gate to the holding member,
The holding member includes a holding bottom portion fixed obliquely upward from a top plate that closes an upper portion around the dissolution chamber, a side wall portion that stands on both sides of the holding bottom portion, and a tip wall that stands on the tip end. And
The fastening means has a contact plate that projects between the side wall portions and contacts the top surface of the top of the gate, and a pressure contact bolt that is screwed into and penetrates the contact plate.
A melting furnace, wherein the contact plate is connected to both the side wall portion and the tip wall portion . The block-shaped sprue is melting furnace of claim 1 Symbol mounting, characterized in that it is formed of a material mainly containing silicon carbide.

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