JP2006234360A - Raw material charging device to molten metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charging device capable of charging a raw material to molten metal stored in a storing container with an upper lid without removing the upper lid while minimizing heat energy loss. <P>SOLUTION: This raw material charging device 1 comprises an outer case 2 having a hanger 5 at its upper portion and a rotary hook 6 for suspending the raw material at its lower portion, a core 3 mounted inside of the outer case movably to the outer case, and a heat-shield plate 4 integrated with the core. When the raw material charging device is lowered toward an opening portion of the upper lid 21 through the hanger, only the outer case is continuously lowered even after the heat-shield plate 4 is brought into contact with the upper lid 21 and stopped, thus the rotary hook and the core are separated from each other, the rotary hook separated from the core is rotated by gravity of the raw material so that the raw material is removed from the rotary hook, and the raw material removed from the rotary hook is charged into the molten metal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an apparatus for introducing raw materials such as component adjustment alloy materials, refining ironmaking agents, iron scrap, slag cut refractories into molten metal accommodated in holding containers such as ladle and hot metal ladle. It is about.

  For molten steel refined in a converter or electric furnace, a predetermined amount of alloy iron or metal for component adjustment is usually supplied via a raw material input device provided around the furnace when steel is output from the converter or electric furnace. In addition, a fossilizing agent such as quicklime is automatically cut out and added. However, when the addition amount is small, or when the addition amount is rare and the addition amount is small, it may be put into molten steel accommodated in a holding container such as a ladle after the steel is discharged. Also, in the continuous casting process, the slag cutting refractory used to prevent the slag in the ladle from flowing out into the tundish at the end of casting is strongly agitated with the molten steel and slag when introduced at the time of steel output. Since it is difficult to exhibit its function, it cannot be put in at the time of steelmaking, and is put on the molten steel accommodated in the ladle after steelmaking.

Since these raw materials such as alloy materials and slag-cut refractories are heavy and splash is generated at the time of loading, it is dangerous for workers to throw near the holding container. In most cases, it is hung into the holding container and then thrown in (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 63-11158

  In recent years, energy conservation has been achieved from the viewpoint of not only the preservation of the global environment but also the manufacturing cost by reducing thermal energy, and a holding container that accommodates molten steel is provided with an upper lid that covers the opening of the holding container It became so.

  When the raw material is put into the molten steel in the holding container, if the upper lid is removed, the raw material can be easily put into a predetermined position in the holding container, but the loss of heat energy becomes unfavorable. Of course, it cannot be put in place with the upper lid installed. Therefore, an opening has been provided in the upper lid, and it has come to be suspended through the opening.

  However, when throwing from the opening, it is necessary to visually observe the raw material suspended by the crane. For visual observation, the opening must be enlarged, and the loss of heat energy is large. There was a problem of becoming. In addition, it has to be operated remotely, and there is a problem that the working time varies greatly depending on the skill level of the operator who operates the crane.

  The present invention has been made in view of such circumstances, and the object of the present invention is an alloy material for component adjustment, a slag cut refractory, etc., in a molten metal accommodated in a holding container provided with an upper lid. When the raw materials are added, it is possible to add to the molten metal without removing the top cover, minimizing thermal energy loss, and easily input regardless of the skill level of the operator who operates the crane etc. It is to provide a raw material input device.

  An apparatus for charging a raw material into a molten metal according to an invention for solving the above-mentioned problems includes an outer case provided with a suspension hand for being lifted and transported at an upper part thereof, and a rotary hook for suspending the raw material at a lower part thereof. A core disposed inside the outer case so as to be movable with respect to the outer case, and a heat insulating plate configured integrally with the core, and accommodated in a holding container provided with an upper lid A raw material charging device for charging a raw material into the molten metal, wherein when the raw material charging device is lowered toward the opening of the upper lid through the suspension, the previous heat insulating plate contacts the upper lid. Even after the descent stops, the descent continues only in the outer case, so that the contact between the rotating hook and the core is disconnected, and the rotating hook that is disconnected from the core is rotated by the gravity of the raw material. The raw material comes off from the Raw materials out of the is characterized in that is introduced into the molten metal.

  By using the raw material charging device according to the present invention, raw materials such as component-adjusting alloy materials, refining ironmaking agents, iron scrap, slag cutting refractories, etc. are accommodated in a molten metal accommodated in a holding container provided with an upper lid. , The energy loss can be minimized without removing the top lid, and it is possible to easily and reliably do so regardless of the skill level of the operator who operates the crane or the like.

  Hereinafter, the present invention will be specifically described with reference to the accompanying drawings, taking as an example the case where raw materials are charged into molten steel accommodated in a ladle. 1-3 is a figure which shows embodiment of this invention, Comprising: FIG. 1 is the schematic which shows the condition which introduce | transduces raw material into a ladle using the raw material injection | throwing-in apparatus which concerns on this invention, FIG. FIG. 3 is a perspective view of the raw material input device according to the present invention, and FIG. 3 is a half sectional view of the raw material input device according to the present invention.

  As shown in FIGS. 1 to 3, the raw material input device 1 according to the present invention is roughly composed of three parts: an outer case 2, a core 3, and a heat insulating plate 4. The outer case 2 has a hollow inside, and a suspension 5 for hooking a hook 27 such as a crane or a hoist is installed at the upper end thereof, and a wire 25 or the like is disposed at the lower end thereof. A rotating hook 6 for hanging the raw material 26 is installed. The rotary hook 6 is attached by a pin 13 fixed to the outer case 2, and can freely rotate with respect to the pin 13. However, as shown in FIG. 4, the rotary hook 6 lacks about 1/3 of the circular shape, and therefore the center of gravity of the rotary hook 6 is in an eccentric position with respect to the pin 13. Therefore, it rotates to try to make the notch part upward. FIG. 4 is an enlarged view of the rotary hook 6.

  At the lower end portion of the outer case 2, an anti-slip 8 is provided to prevent the wire 25 and the like hung on the rotary hook 6 from being removed from the rotary hook 6 when the raw material charging device 1 is conveyed by a crane, a hoist or the like. It is installed via a pin 14 attached to the case 2. The stopper 8 is also rotatable with respect to the pin 14, but a stopper 11 is provided at the lower end of the outer case 2, and the stopper 8 has a rotation range limited by the stopper 11. Has been. That is, the stopper 8 rotates until it comes into contact with the stopper 11, but cannot rotate more than that, so that the stopper 8 does not come off the rotary hook 6. Further, a lower limit stopper 7 for restricting the movement of the core 3 is installed at the lower part on the inner surface side of the outer case 2.

  A core 3 is installed inside the outer case 2. The core 3 is integrated with the heat insulating plate 4 by a connecting pin 9 disposed through the frame 15 installed on the heat insulating plate 4 and a pin 12 installed on a metal fitting 16 attached to the connecting pin 9. It is configured. A locking plate 10 is installed at the lower end of the core 3. The locking plate 10 is configured to mesh with the cutout portion of the rotary hook 6. The core 3 can move in the internal cavity of the outer case 2, but the moving range is limited by the lower limit stopper 7. That is, the lower limit stopper 7 and the lower end 3 </ b> A of the core 3 come into contact with each other, so that the core 3 does not move beyond the lower limit stopper 7.

  The heat insulating plate 4 is circular in these drawings, but the shape may be any. Moreover, as long as the magnitude | size is more than the magnitude | size which covers 21 A of opening parts of the upper cover 21, what kind of thing may be used.

  Using the raw material input device 1 according to the present invention configured as described above, raw materials 26 such as alloy iron, iron making agent, iron scrap, slag cutting refractories are input to the molten steel 24 accommodated in the ladle 20. How to do it.

  First, the raw material 26 is connected to the wire 25 so that the raw material 26 to be charged can be lifted by the wire 25. Although the wire 25 is used here, it is not limited to the wire 25, and any wire may be used as long as the raw material 26 can be lifted. However, since it is used in a high temperature atmosphere, it is preferable to have excellent heat resistance and fire resistance. Then, the wire 25 is hung on the notch portion of the rotary hook 6.

  Next, a hook 27 of a transport facility such as a crane or a hoist is hung on a suspension 5 of the raw material input device 1, and the raw material input device 1 is wound up by a transport facility such as a crane or a hoist. The hanger 5 is installed in the outer case 2, and the outer case 2 is lifted simultaneously with the lifting of the hook 27 by being lifted by transport equipment such as a crane. The core 3 moves inside the outer case 2, but its lower end 3A is held by the outer case 2 by coming into contact with the lower limit stopper 7, and is in contact with the lower limit stopper 7 as shown in FIG. It is lifted together with the outer case 2. Since the core 3 exists at the lower limit position, the locking plate 10 at the tip of the core 3 is in a state of being engaged with the notch portion of the rotary hook 6.

  By continuing to wind up the transportation equipment such as a crane, the raw material 26 is eventually lifted into the space. When the raw material 26 is lifted in the space, the wire 25 is placed at a position eccentric from the center of the rotary hook 6, so that the rotary hook 6 tries to rotate due to the gravity of the raw material 26, but the notch portion of the rotary hook 6 As shown in FIG. 3, the end face 6 </ b> A contacts the locking plate 10, the rotation of the rotary hook 6 is stopped, and the wire 25 suspending the raw material 26 is held in the vicinity of the hook recess 6 </ b> B of the rotary hook 6. That is, in a state where the raw material 26 is lifted in the space, the wire 25 is present in the vicinity of the hook recess 6B, and the moment of clockwise rotation in FIG. That is, a moment that the raw material 26 tends to come off the rotary hook 6 acts.

  In a state where the raw material 26 is lifted, a transport facility such as a crane or a hoist is moved to a predetermined position above the ladle 20 where the upper lid 21 is installed, and the raw material is directed toward the opening 21A of the upper lid 21 as shown in FIG. The dosing device 1 is suspended. The upper lid 21 is composed of an iron skin 22 and a refractory 23. The upper lid 21 is provided with a suspender for lifting with a transport facility such as a crane or a hoist, but is omitted in FIG.

  The raw material charging device 1 is lowered through the opening 21A. When the heat insulating plate 4 of the raw material charging apparatus 1 comes into contact with the upper lid 21, the core 3 configured integrally with the heat insulating plate 4 stops descending together with the heat insulating plate 4. Even after the heat insulating plate 4 comes into contact with the upper lid 21, the conveyance equipment such as a crane or a hoist is continuously wound down. By continuing to lower the transfer equipment, only the outer case 2 continues to descend. When the outer case 2 is lowered, the rotary hook 6 is also lowered, and when the position of the rotary hook 6 is vertically lower than the lower end of the locking plate 10, the contact between the end surface 6A of the rotary hook 6 and the locking plate 10 is reached. As a result, the rotary hook 6 rotates with the moment of gravity of the raw material 26. As a result, the wire 25 is detached from the rotary hook 6, and the raw material 26 is put into the molten steel 24. The rotary hook 6 rotates after the raw material 26 is charged so that the cutout portion is upward. Even if the lowering of the transportation equipment such as a crane becomes excessive, the outer case 2 is in contact with the upper end of the core 3, so that the outer case 2 is not lowered further.

  After the raw material 26 is charged, the winding equipment such as a crane or a hoist is started to be wound up. As a result of this winding, the outer case 2 rises, and the rotary hook 6 is engaged with the locking plate 10. The lower limit stopper 7 comes into contact with the core 3 as the outer case 2 rises, and the core 3 and the heat insulating plate 4 are also lifted from the opening 21A as a unit.

  Thus, although the raw material input device 1 which concerns on this invention presupposes using in holding containers, such as the ladle 20 which installed the upper cover 21 which has 21 A of opening parts, even if the upper cover 21 is not installed If an alternative to the upper lid 21 is installed, it can be used. Since the opening 21A of the upper lid 21 is covered with the heat insulating plate 4 at the time of charging, loss of thermal energy can be suppressed. When the raw material input device 1 is not inserted into the opening 21A, it is preferable to cover the opening 21A with a material corresponding to the heat insulating plate 4 in order to prevent thermal energy loss. The upper lid 21 may be provided with a hatch-type lid for covering the opening 21A.

  As described above, using the raw material charging apparatus 1 according to the present invention, the raw material 26 such as the component adjusting alloy material, the smelting agent, the iron scrap, the slag cutting refractory, and the like is installed on the upper lid 21. By putting it in the molten steel 24 accommodated in the ladle 20, it is possible to easily and without removing the upper lid 21 and minimizing heat energy loss, and without regard to the skill level of the operator who operates the crane and the like. It becomes possible to insert it reliably.

It is the schematic which shows the condition which throws in a raw material into a ladle using the raw material injection | throwing-in apparatus which concerns on this invention. It is a perspective view of the raw material input device which concerns on this invention. It is a half sectional view of the raw material input device concerning the present invention. It is an enlarged view of the rotation hook which comprises the raw material injection | throwing-in apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw material input apparatus 2 Outer case 3 Core 4 Heat insulation board 5 Lifting hand 6 Rotating hook 7 Lower limit stopper 8 Detachment 9 Connection pin 10 Locking plate 11 Detachment stopper 12 Pin 13 Pin 14 Pin 15 Frame 16 Metal fitting 20 Ladle 21 Top cover 22 Iron skin 23 Refractory 24 Molten steel 25 Wire 26 Raw material 27 Hook

Claims (1)

  An outer case having a suspension hand for being lifted and transported at its upper part, and a rotary hook for suspending raw materials at its lower part, and being arranged inside the outer case so as to be movable with respect to the outer case A raw material charging device comprising: a core; and a heat insulating plate configured integrally with the core, the raw material charging device for charging the raw material into a molten metal accommodated in a holding container provided with an upper lid, When the raw material input device is lowered toward the opening of the upper lid through the suspension hand, only the outer case continues to descend after the previous heat insulating plate contacts the upper lid and stops descending. The rotating hook that has lost contact with the core is rotated by the gravity of the raw material, the raw material comes off from the rotating hook, and the raw material removed from the rotating hook is put into the molten metal. Featuring molten gold Raw material input device to.

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