JP3666750B2 - Graphite spheroidizing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a graphite spheroidizing equipment for melting molten cast iron for ductile casting by adding metal Mg or Mg alloy.
[0002]
[Prior art]
Ductile castings such as ductile cast iron pipes have the same tensile strength as steel materials, their mechanical test values such as elongation and toughness are ten times that of ordinary cast iron, and have excellent corrosion resistance equivalent to that of ordinary cast iron. Therefore, it is widely used in various piping materials under more severe environments such as underground pipes that require these characteristics.
[0003]
This ductile casting is obtained by adding an Mg alloy such as metal Mg or Fe—Si—Mg alloy as a graphite spheronizing agent to a hot spring melted by cupola or an electric furnace using iron scrap as a main iron source material, and C: 3 -4% by mass (hereinafter referred to as "%"), Si: 2-3%, Mn: 0.2-0.5%, Mg: 0.01-0.06% molten cast iron This is manufactured by casting with a casting facility such as a centrifugal casting machine (for example, see Patent Document 1).
[0004]
As a method of adding metal Mg or Mg alloy to the source water, various addition methods such as pouring method, ladle addition method with lid, plunger method, pressure addition method, wire feeder method are adopted to increase the addition yield. (For example, refer nonpatent literature 1) The graphite spheroidization processing equipment is comprised according to the addition method, respectively. However, Mg has a low boiling point (1110 ° C.) and has a high vapor pressure in the temperature range of molten cast iron. Therefore, when Mg is added to molten cast iron, explosive fumes and molten metal spouts are generated. To do.
[0005]
Among the addition methods described above, in the plunger method and the pressure addition method, Mg is added in a sealed structure or a container similar to the sealed structure, so that no molten metal is ejected from the container. However, in other addition methods, in order to prevent smoke generation and molten metal ejection, it is common practice to install a lid that covers the top of the container, which is the opening of the container (see, for example, Patent Document 2).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-24415 [Non-Patent Document 1]
Japan Foundry Association, "Revised 4th Edition Casting Handbook" January 20, 1986, p.560-565
[Patent Document 2]
JP-A-53-70020 [0007]
[Problems to be solved by the invention]
However, when a lid is installed in the opening, the molten metal is prevented from being ejected from the processing container, but the molten metal scattered during Mg addition adheres and accumulates on the inner surface side of the lid. When the lid on which the molten metal is deposited or deposited is separated from the processing container and the processing container is moved from directly below the lid, the metal that has adhered to the lid is cooled, contracted, and peeled off from the lid. Fall into. When the lid is installed in the graphite spheroidization treatment facility, a conveyance facility for conveying the processing container is usually installed directly under the lid, and the conveyance facility is damaged by the falling metal and the extent of the damage Depending on the situation, the transfer operation is hindered. Moreover, in order not to disturb the graphite spheroidizing treatment work, it is necessary to remove the fallen / deposited metal from the transport passage even if the transport facility is not damaged.
[0008]
Conventionally, not only graphite spheroidizing equipment equipped with an efficient means for preventing damage to the transportation equipment due to the falling metal, but also the efficiency for preventing the falling metal from accumulating in the transportation path directly under the lid No graphite spheroidizing equipment equipped with such means has been proposed.
[0009]
The present invention has been made in view of the above circumstances, and the object of the present invention is to prevent metal from being ejected using a processing vessel whose opening is covered by a lid, while using metal Mg, Mg alloy, etc. When melting the cast iron for ductile casting by adding graphite spheroidizing agent, not only did it prevent the transportation equipment installed just under the lid from being damaged by the fall of the ingot attached to the lid, but also dropped An object of the present invention is to provide a graphite spheroidizing treatment facility capable of preventing hindrance of the graphite spheroidizing treatment work due to the accumulation of metal.
[0010]
[Means for Solving the Problems]
A graphite spheroidizing treatment facility according to a first aspect of the present invention for solving the above-mentioned problems includes an Mg supply means for supplying metallic Mg or Mg alloy into a processing vessel containing molten cast iron, and a lid that covers the opening of the processing vessel And a conveying means for conveying the processing container, a bullion receiving plate that is connected to a fixed shaft at one end side and is rotatable about the fixed shaft, and a driving means for rotating the bullion receiving plate. The spheroidizing processing equipment comprising: the processing vessel supplied with Mg by the Mg supply means is transported from the position directly below the lid by the transport means, and then the bullion receiving plate is driven. The bulge is rotated to a position directly below the lid by means, and the bullion is peeled off from the lid by the bullion receiving plate.
[0011]
The graphite spheroidizing treatment facility according to the second invention is the spheroidizing treatment facility according to the first invention, wherein the bullion receiving plate is tilted directly below the lid so that the bullion falling on the bullion receiving plate slides down by its own weight. It is characterized by being arranged.
[0012]
In the graphite spheroidizing treatment facility according to a third aspect of the present invention, in the first or second aspect, the driving means receives a signal from a position detecting means for detecting the position of the processing vessel, and automatically receives the base metal receiving plate. It is characterized by rotating.
[0013]
In the graphite spheroidizing treatment facility according to a fourth aspect of the present invention, in any one of the first to third aspects, the fixed shaft is disposed in a direction in which the axial direction is substantially parallel to the moving direction of the processing container. It is characterized by this.
[0014]
The graphite spheroidizing treatment facility according to a fifth aspect of the present invention is the roller table system according to any one of the first to fourth aspects, wherein the transport means moves the processing vessel mounted on the roller as the roller rotates. It is characterized by being.
[0015]
In the graphite spheroidization processing facility according to the present invention, a metal receiving plate that rotates so as to cover the conveying means of the processing container is provided immediately below the lid for covering the opening of the processing container. After the Mg or Mg alloy is added, even if the ingot attached to the lid is cooled, peeled off and dropped, it will only be dropped on the ingot receiving plate rotated to the position just below the lid. Since it does not fall directly on the means, it is possible to prevent the conveying means from being damaged due to falling metal. Further, since the fallen metal slides down on the metal receiving plate and accumulates at a position away from the conveying means, even if the metal is deposited, it does not hinder the graphite spheroidizing operation. On the other hand, when the processing container is carried into the graphite spheroidization processing facility, the metal receiving plate is rotated to the standby position so as not to prevent the processing container from being carried in. It will not be.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1-3 is a figure which shows the example of embodiment of this invention, Comprising: FIG. 1 is a schematic side view which shows the whole structure of the graphite spheroidization processing equipment which concerns on this invention, FIG. FIG. 3 is a schematic plan view of the graphite spheroidizing treatment facility, and FIG.
[0017]
As shown in these figures, the graphite spheroidizing treatment facility 1 has an iron shell 2 as an outer shell, and as a conveying means for carrying in and out a ladle 8 as a processing container while being covered with the iron shell 2. A roller table 4 is installed. In the place where the roller table 4 is installed, an elevating shutter 3 is disposed so as to cover the opening of the iron skin 2 that becomes the passage of the ladle 8.
[0018]
As shown in FIGS. 2 and 3, the roller table 4 includes a plurality of rollers 6 having a concave shape at the center, and is rotatably held by a bearing 7 attached to the table frame 5, and is arranged in the vertical direction. Each roller 6 is configured to be rotated by a roller drive motor (not shown) attached to the roller table 4. The ladle 8 is supported by the roller table 4 in a state where a pair of rails 9 arranged on the bottom surface of the ladle 8 are placed in the recesses of the roller 6, and moves on the roller 6 as the roller 6 rotates. ing. In this case, the roller table 4 is provided with a stopper (not shown) for fixing the ladle 8 so as not to move during the graphite spheroidization process, and for detecting the position of the ladle 8. A plurality of limit switches (not shown) are installed.
[0019]
A lid 13 for covering the upper opening of the ladle 8 is disposed immediately above the ladle 8 that has been carried to a predetermined position in the graphite spheroidizing treatment facility 1 by the roller table 4. The other end of the lid 13 is connected to a chain 15 that connects to the lid lifting device 14, and the lid 13 moves up and down via the chain 15 that is wound up or down by the lid lifting device 14. To cover. A plurality of chains 15 are arranged, and each chain 15 is independently connected to the lid lifting device 14. The lid lifting device 14 is driven by an electric motor (not shown).
[0020]
A pair of pinch rolls 10 is disposed above the iron skin 2 on the ceiling side and supplied with an iron-coated Mg wire 12 between the pinch rolls 10 facing each other. The iron-coated Mg wire 12 is supplied into the ladle 8 through the guide pipe 11 that passes through the lid 13 and extends toward the upper opening of the ladle 8. A gap is provided between the lid 13 and the guide pipe 11 so that the lid 13 can sufficiently move up and down. In this graphite spheroidizing treatment facility 1, in order to supply two iron-coated Mg wires 12 simultaneously, Mg supply means composed of a pair of pinch rolls 10 and guide pipes 11 are independently arranged one by one. . The supply amount of the iron-coated Mg wire 12 is measured by the measure roll 23. The iron-coated Mg wire 12 is a clad wire material in which an Mg alloy such as metal Mg or Fe—Si—Mg alloy is used as a core material, and the core material is covered with a thin steel plate.
[0021]
One end is supported by the iron shell 2 and the other end is supported by a support fitting 22 attached to the table frame 5, and its axis is in a direction substantially parallel to the moving direction of the ladle 8 on the roller table 4. Fixed shafts 17 are respectively disposed on both sides of the roller table 4. A counterweight 18 is attached to each fixed shaft 17, and one end portion of the metal receiving plate 16 is attached to the counterweight 18. On the other hand, a lever 19 is provided at the tip of the fixed shaft 17 penetrating the iron skin 2, and this lever 19 is connected to a cylinder rod 21 of an air cylinder 20 attached to the outer wall surface of the iron skin 2. That is, by operating the air cylinder 20, the lever 19 moves up and down, and the fixed shaft 17 rotates as the lever 19 moves up and down, and the counterweight 18 and the counterweight are rotated by the rotation of the fixed shaft 17. A metal receiving plate 16 attached to 18 rotates about a fixed shaft 17 as a rotation axis.
[0022]
The bullion receiving plate 16 is rotated so as to cover the roller table 4 as shown in the left bullion receiving plate 16 in FIG. 3, and the tip of the bullion receiving plate 16 is the other bullion receiving plate. The metal receiving plate 16 is inclined so as to be lowered on the fixed shaft 17 side. On the other hand, the bullion receiving plate 16 rotates to the standby position so as not to hinder the movement of the ladle 8 on the roller table 4 as shown by the solid bullion receiving plate 16 on the right side of FIG. It is like that. In this case, it is preferable to adjust the inclination angle of the bullion receiving plate 16 so that the bullion dropped on the bullion receiving plate 16 slides down on the bullion receiving plate 16 by its own weight. Further, a collection container (not shown) for collecting the bare metal sliding down from the bare metal receiving plate 16 may be installed on both sides of the bare metal receiving plate 16.
[0023]
A graphite spheroidizing method for molten cast iron for ductile casting using the graphite spheroidizing treatment facility 1 having such a configuration will be described below.
[0024]
A ladle (molten cast iron) obtained from an iron source such as iron scrap and a carbonaceous material such as coke, melted in a melting furnace such as a cupola or electric furnace, and further desulfurized as necessary Pour 8 into the water. Then, the ladle 8 containing the original hot water is transported to the graphite spheroidizing treatment facility 1 by appropriate transport means such as a crane and a transport cart, and the ladle 8 is placed on the roller table 4. In this embodiment shown in FIG. 1, the ladle 8 is transferred to the graphite spheroidizing equipment 1 using a transfer carriage, and the transfer carriage facing the roller table 4 is omitted in FIG.
[0025]
In this case, before the ladle 8 is placed on the roller table 4, the metal receiving plate 16 rotates so as to cover the roller table 4 as shown in the left metal receiving plate 16 in FIG. 3. (Hereinafter, this state is referred to as an “operating state”), immediately before the ladle 8 is placed on the roller table 4 or when it is conveyed to a predetermined position on the roller table 4, The air cylinder 20 automatically operates, and the bullion receiving plate 16 reaches the standby position for preventing the movement of the ladle 8 as shown by the solid bullion receiving plate 16 on the right side of FIG. It is rotated to a rotated state (hereinafter, this state is referred to as a “standby state”).
[0026]
If the ladle 8 is carried on the roller table 4 to a predetermined position of the graphite spheroidizing treatment equipment 1 with the bullion receiving plate 16 in the standby state, the lid lifting device 14 is driven to lower the lid 13. The upper opening of the ladle 8 is covered by the lid 13. Next, the pinch roll 10 is driven, and the iron-coated Mg wire 12 is supplied into the ladle 8 while the supply amount of the iron-coated Mg wire 12 is measured by the measure roll 23. The hot water in the ladle 8 is subjected to graphite spheroidization treatment with the added Mg, and the hot water is melted into ductile molten cast iron.
[0027]
When a predetermined amount of iron-coated Mg wire 12 is supplied into the ladle 8 and the graphite spheroidizing process with Mg is completed, the pinch roll 10 is stopped, and then the lid lifting device 14 is driven to remove the lid 13. Raise to a predetermined position. On the other hand, if the lid 13 and the ladle 8 are separated, the roller 6 of the roller table 4 is driven, and the ladle 8 is unloaded from the graphite spheroidizing treatment facility 1.
[0028]
After the ladle 8 is unloaded from the roller table 4 or when it is unloaded to a predetermined position on the roller table 4, the air cylinder 20 is automatically activated and is in a standby state. 16 is rotated to the operating state. Until the next graphite spheroidization treatment, the metal receiving plate 16 is maintained in the operating state. Next, the ladle 8 containing the molten cast iron for ductile casting is transported to a casting facility such as a centrifugal casting machine in the next step using an appropriate transporting means such as a crane or a transport carriage.
[0029]
In this case, the roller table 4, the pinch roll 10, the lid lifting / lowering device 14, and the air cylinder 20 are all automatically operated by a signal such as a limit switch.
[0030]
By using the graphite spheroidizing treatment equipment 1 having such a configuration, the bare metal scattered during the graphite spheroidizing treatment and attached to the lid 13 is cooled during the period until the next graphite spheroidizing treatment, and the lid 13 Even if it is peeled off and dropped, since the bullion receiving plate 16 is installed directly under the lid 13, the bullion does not fall directly on the roller table 4, and is due to the falling bullion of the roller table 4. Damage can be prevented in advance. Further, since the dropped bullion slides down on the bullion receiving plate 16 and accumulates at a location away from the roller table 4, it is not necessary to remove the accumulated bullion to move the ladle 8. In the case where a bullion collection container is provided at a place where the fallen bullion is deposited, the bullion processing operation is completed simply by exchanging the bullion collection container.
[0031]
The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, although the Mg addition method described above is a wire feeder method, the present invention can be applied to other methods such as a pouring method as long as the addition method has an open portion in the processing container. . Further, although two bullion receiving plates 16 are installed, they can be combined into one bullion receiving plate. Furthermore, the conveying means of the ladle 8 is not limited to the roller table system, and may be other conveying means such as a cart system. Furthermore, the lid lifting device 14 and the like may have any form as long as the functions are the same.
[0032]
【The invention's effect】
According to the graphite spheroidizing treatment facility according to the present invention, a bullion receiving plate that rotates so as to cover the conveying means of the processing container is provided immediately below the lid for covering the opening of the processing container. Even if metal ingot or metal alloy is added and the ingot attached to the lid is cooled and peeled off, it will only fall on the ingot receiving plate, not directly on the transport means The transporting means can be prevented from being damaged due to falling metal. Further, since the fallen metal slides down on the metal receiving plate and accumulates at a position away from the conveying means, even if the metal is deposited, it does not hinder the graphite spheroidizing operation. As a result, it is possible to efficiently perform the spheroidizing treatment work of the molten cast iron, which brings about an industrially beneficial effect.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an embodiment of the present invention, and is a schematic side view illustrating the overall configuration of a graphite spheroidizing treatment facility according to the present invention.
FIG. 2 is a diagram showing an embodiment of the present invention, and is a schematic plan view of a graphite spheroidizing treatment facility according to the present invention.
FIG. 3 is a schematic side view taken along the line XX ′ of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Graphite spheroidization processing equipment 2 Iron skin 3 Shutter 4 Roller table 5 Table mount 6 Roller 7 Bearing 8 Ladle 9 Rail 10 Pinch roll 11 Guide pipe 12 Iron covering Mg wire 13 Lid 14 Lid raising / lowering device 15 Chain 16 Ingot receiving plate 17 Fixed shaft 18 Counterweight 19 Lever 20 Air cylinder 21 Cylinder rod 22 Support bracket 23 Major roll

Claims (5)

Mg supply means for supplying metal Mg or Mg alloy into a processing container containing molten cast iron, a lid covering the opening of the processing container, a transport means for transporting the processing container, and one end side connected to a fixed shaft, A graphite spheroidizing treatment facility comprising a base metal receiving plate that is rotatable about the fixed shaft and a driving means for rotating the base metal receiving plate, wherein the Mg supply means After the supplied processing container is transported from the position directly below the lid by the transport means, the bullion receiving plate is rotated to the position just below the lid by the driving means, and is peeled from the lid by the bullion receiving plate. The graphite spheroidizing equipment is characterized by receiving falling metal. 2. The graphite spheroidizing process according to claim 1, wherein the bullion receiving plate is disposed immediately below the lid in an inclined state so that the bullion dropped on the bullion receiving plate slides down due to its own weight. Facility. 3. The graphite sphere according to claim 1, wherein the driving unit receives a signal from a position detecting unit that detects a position of the processing container, and automatically rotates the bare metal receiving plate. 4. Processing equipment. The graphite spheroidizing treatment according to any one of claims 1 to 3, wherein the fixed shaft is arranged in a direction in which an axial center direction thereof is substantially parallel to a moving direction of the processing container. Facility. The graphite sphere according to any one of claims 1 to 4, wherein the transport means is a roller table system in which a processing vessel mounted on a roller is moved by rotating the roller. Processing equipment.

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