JP2008240071A - Ladle refining apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refining apparatus with which in a process for heating-refining molten steel in a ladle, a ladle truck having moved while loading a ladle on it, is released and the ladle truck can freely be utilized. <P>SOLUTION: In this ladle refining apparatus, a furnace cover 11 is provided with an electrode 12 to constitute a heating device and at its lower part, a ladle keeping mechanism 16 provided with a receiving member for receiving the ladle 6 and a supporting means which moves vertically while supporting the receiving member, is installed. Further, to a space at the lower part of the heating device, at least two passages 4 on which the plurality of ladle trucks 5 can selectively be advanced/retreated, are provided. In the ladle placing range in the respective ladle trucks, a hole for permitting the vertical movement of the receiving member in the ladle keeping mechanism and a notched part at the side of the hole so that the receiving member in the ladle keeping mechanism can be escaped to the side of the hole are provided. The ladle truck is made to freely come in/come out at the lower part of the ladle in a state in which the ladle is received by the receiving member of the ladle keeping mechanism. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ladle refining device, and more specifically, a heating device for heating and refining the bath steel in the ladle, the ladle being positioned below the heating device, and the bath steel in the ladle The present invention relates to a ladle refining device that is adapted to heat refining.

Conventionally, ladle refining equipment is widely known. For example, Patent Document 1 discloses a ladle refining device as a simple device for out-of-furnace refining equipment.
In a ladle refining device, first, molten steel (bath steel) melted and refined by a refining furnace such as a steelmaking furnace or an arc electric furnace, that is, a molten metal is received in a ladle. The ladle travels to the lower side of the heating device of the ladle refining device composed of the furnace lid and the graphite electrode array arranged with respect to the furnace lid.
When the ladle is placed on the traveling carriage and reaches the bottom of the furnace lid, the vertically movable furnace lid is lowered, and the graphite electrode array is inserted into the ladle.
The graphite electrode array penetrates the inside of the furnace lid, and the upper electrode located above the furnace lid is held so as to be movable up and down separately from the furnace lid.
In the state as described above, the molten metal in the ladle placed on the traveling carriage is heated with arc (DC or AC power) by the refining device, and the ladle is placed on the traveling carriage. The bath steel inside is heated and refined (see Patent Document 1).

  In the ladle refining equipment described above, the ladle is placed on the traveling carriage and the molten metal in the ladle is heated and refined by arc, so the carriage moves quickly after refining. By doing so, there is a feature that the ladle containing the molten metal can be moved toward the next process.

JP-A-10-72615

However, in this conventional ladle refining apparatus, the ladle and the traveling cart on which the ladle is placed are in an inseparable relationship, and the molten metal in the ladle is heated and refined with arc. During the running time, the traveling cart on which the ladle is placed becomes monopolized by the ladle being heated and refined, and there is a problem that hinders efficient diversion of the traveling cart. Regarding the technical matter in this respect, as is apparent from the flow line drawn in the column of the prior art in FIG. 5, always including the time during which the molten metal in the ladle is heated and refined by arc. The ladle and the traveling carriage are integrated, and the cycle time required for heating and refining takes a significantly longer time than in the case of the present invention.
Furthermore, when a ladle containing molten metal is directed to the next processing step after predetermined heating and refining in the ladle refining device, a traveling cart paired with the ladle is used. Since it must be used, the traveling carriage will move further away from the first starting point, and it will take a long time to return to the first starting point as is apparent from FIG. . Therefore, there has been a problem that the operating efficiency of the ladle refining apparatus is further reduced.

The purpose of this application is to release the ladle cart that has been moved with the ladle in the process of heating and refining the bath steel in the ladle in the ladle refining device so that it can be used freely. It is intended to provide a ladle refining device.
Another object is to use the second ladle trolley different from the ladle trolley that has moved with the ladle at the time of completion of heating and refining the bath steel in the ladle, It is an object of the present invention to provide a ladle refining apparatus that can take away a ladle after completion of heating and refining.
Other objects and advantages will be readily apparent from the drawings and the following description associated therewith.

The ladle refining apparatus in the present invention,
A furnace lid 11 for covering the ladle 6 is provided with an electrode 12 for heating the bath steel in the ladle 6;
On the other hand, the lower side of the furnace lid 11 includes a space 14 in which the ladle 6 mounted on the ladle cart 5 can enter and exit,
The ladle 6 is positioned with respect to the lower side of the furnace lid 11, the furnace lid 11 is covered with the ladle 6, power is supplied to the electrode 12, and the bath steel in the ladle 6 is heated and refined. In the ladle refining equipment
Below the space 14 where the ladle 6 mounted on the ladle cart 5 can enter and exit, a receiving member 22 for receiving the ladle 6 and a support means 18 for supporting the receiving member 22 and moving up and down. Installed ladle storage mechanism 16 equipped with
On the other hand, at the periphery of the space 14, at least two passages 4 that enable the selective movement of the ladle cart 5 with respect to the space 14 are provided, and the passages 4 are respectively provided. A ladle cart 5 is arranged freely to reciprocate toward the space 14,
In the ladle loading area 28 in each ladle cart 5, a ladle 29 for allowing the receiving member 22 to move up and down in the ladle storage mechanism 16 and a ladle deposit raised through the through hole 29. In order to allow the receiving member 22 or the supporting means 18 in the mechanism to escape to the side, a missing portion 30 is provided on the side of the through hole 29, and the ladle 6 is received by the receiving member 22 in the ladle storage mechanism 16. In this state, the ladle cart 5 can be freely moved in and out below the ladle 6.

  As described above, according to the present invention, the ladle storage mechanism 16 is provided below the ladle storage space 14 provided on the lower side of the furnace lid 11, and the space 14 is moved toward the ladle storage mechanism 16. The ladle 6 can be carried from one side on the ladle cart 5a, the ladle 6 can be transferred to the ladle storage mechanism 16, and the ladle cart 5a can be turned back in an empty state. The ladle trolley 5a that has been turned back can be freely operated even during the time zone in which the molten metal in the ladle 6 is heated and refined above the ladle storage mechanism 16 for the next heating and refining. There is a feature that makes it possible to prepare for. This is effective in improving the operating rate of heat refining.

  Furthermore, at the time of completion of heating and refining, the second ladle trolley 5b different from the first ladle trolley 5a brought in the ladle 6 from the one side is from the other side different from the one side. Since the ladle 6 that enters the ladle storage mechanism 16 and that has been heated and refined can be taken out, the space 14 located below the furnace lid 11 is immediately subjected to the first from the one side. The ladle 6 placed on the ladle trolley 5a can enter and the next heating and refining work can be started in a very short time. From this aspect, the effect of improving the operating rate of the heating and refining can be achieved. is there.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a positional relationship between a ladle refining device and a vacuum degassing facility (RH) in an out-of-furnace refining facility, where (A) is a state without a ladle cart 5 and (B) is a ladle cart. The state where 5 is arranged is shown. FIGS. 2A and 2B are schematic front views for explaining the positional relationship among a ladle refining apparatus, a vacuum degassing facility, a ladle carriage 5 and a ladle 6 in an out-of-core refining facility. FIGS. 3A and 3B are partially broken front views for explaining the positional relationship among the ladle storage mechanism 16, the ladle cart 5, and the ladle 6. FIGS. 4A and 4B are plan views for explaining the relational positions before and after placing the ladle 6 on the ladle cart 5. (C) The figure is the front view seen from the right side of (B) figure, Comprising: It is a front view for demonstrating the relationship between the ladle trolley 5, the ladle 6, and the ladle custody mechanism 16. FIG. FIG. 5 shows a cycle time table for explaining the relationship between the ladle cart 5, the ladle refining device 2, and the vacuum degassing equipment in the conventional example and the present embodiment.

1 to 4, reference numeral 1 denotes an installation place of the outside refining equipment, and a ladle refining device (hereinafter also simply referred to as LF) 2 and a vacuum degassing equipment as a secondary refining furnace in a very limited narrow place. An example in which (RH) 3 is installed is shown. 4 shows the ladle movement route.
In the ladle refining apparatus 2, as is well known, an electrode 12 for heating the bath steel in the ladle 6 is provided to a furnace lid 11 for covering the ladle 6. The apparatus 10 is comprised (refer FIG. 2). On the other hand, a space 14 in which the ladle 6 mounted on the ladle cart 5 can enter and exit is provided below the furnace lid 11 as shown in FIG. Then, the ladle 6 is positioned with respect to the lower space 14 of the furnace lid 11, the furnace lid 11 is covered with the ladle 6 as shown in the figure, and power is supplied to the electrode 12 to take the ladle 6. The bath steel in the pan 6 is heated and refined.

The ladle storage mechanism 16 shown in FIGS. 2 and 3 is provided below the space 14 in which the ladle 6 mounted on the ladle cart 5 can enter and exit as shown in the figure. The ladle storage mechanism 16 includes a receiving member 22 for receiving the ladle 6 and support means 18 that moves up and down while supporting the receiving member 22.
Around the space 14 existing above the ladle storage mechanism 16, there are a plurality of passages 4 (at least two) that allow the ladle cart 5 to selectively move back and forth with respect to the space 14. The ladle carts 5a and 5b are arranged in the passages 4 so as to freely reciprocate toward the space 14, respectively.

In the ladle storage mechanism 16, a deep hole (pit) 17 is provided at a position lower than the work surface (GL) as a place for installing the mechanism 16 as shown in FIGS. A custody mechanism 16 is installed. In the mechanism 16, reference numeral 18 denotes a support means for supporting the ladle 6 and is configured by installing a base frame 19 that is made of a hard material such as steel and is movably moved up and down. Reference numeral 20 denotes a guide means provided so as not to cause the base frame 19 to roll. The guide means 20 corresponds to the relative relationship with the surface facing the base frame 19 such as a guide roller, a guide rail, or a rubbing surface. Consists of sturdy guide means.
Reference numeral 21 denotes a vertical drive device having a known arbitrary configuration for moving the base frame 19 up and down. For example, as is well known, the base is installed at the bottom of the pit and the upper movable part is mounted on the base frame 19. 1 shows a hydraulic drive device. 22 is a table-shaped receiving member made of a hard material such as steel mounted on the upper portion of the base frame 19, and 23 is a receiving portion that constitutes a part of the receiving member. 40 can be carried.

In the ladle trolley 5, since the ladle 6 needs to be moved, a ladle mounting region 28 as shown in FIG. 4 is provided on the upper side. The ladle 6 can be placed in the ladle mounting area 28 in a relative relationship between the ladle cart 5 and the ladle 6 as shown in FIGS. 4 (B) and 4 (C). .
Furthermore, below the ladle loading area 28 in the ladle cart 5, there is a through hole 29 (see FIG. 4C) for allowing the receiving member 22 to move up and down in the ladle storage mechanism 16. In order to allow the receiving member 22 or the support means 18 (base frame 19) in the ladle storage mechanism elevated through the through-hole 29 to escape to the side, it has at least a corresponding shape dimension that allows it to escape (or more). The missing portion 30 (notched portion) having a larger shape dimension is provided on the side of the through hole 29. As shown in FIG. 4, when the missing portion 30 exists, the ladle 6 is received by the receiving member 22 in the ladle storage mechanism 16 as is clear from FIG. 3 (the ladle 6 is placed on the receiving member 22. The ladle trolley 5 can be taken out and put freely below the ladle 6 in a state where the ladle is placed).

  In the ladle trolley 5, reference numeral 25 indicates a pedestal frame that is firmly constructed of a hard material such as steel as is well known, and 26 is a wheel provided in an arbitrary number as required, and is used for the ladle trolley. The pan movement path 4 is configured to correspond to the path (4a to 4f) illustrated in FIG. For example, when the passage is a rail, it is a wheel having a configuration corresponding to the rail. 27 shows the presence of a case in which a well-known drive unit and a control unit provided as necessary are accommodated. In the figure, the case is provided in a portion called the rear side of the ladle cart 5 that can freely move back and forth. It is. In the ladle mounting region 28 described above, 29 is a through hole (which may be a recess) for receiving the receiving member 22 and can be accommodated corresponding to the outer shape of the receiving member 22 located at the top dead center. It only has to be sized. Reference numeral 30 denotes the aforementioned escape missing portion, which also has a size corresponding to the outer shape of the receiving member 22 (or the base frame 19) located at the top dead center so that it can relatively escape in the direction of the arrow 54. .

  In the ladle cart 5, the ladle support member 32 (see FIGS. 3 and 4) provided in the ladle mounting region 28 is made of a hard material such as a steel material to support the ladle 6. Specifically, in order to support the lower edge (seat seat 43) of the bulging reinforcing member 41 integrally formed around the ladle 6 in a stable state from both sides, the ladle As shown in the figure, the carriage 5 is attached in a state of facing each other. Reference numeral 34 denotes a front end portion (engagement portion) for engaging with the lower edge (the seat 43) of the reinforcing member 41 in the ladle 6. As apparent from FIGS. 3A and 3B, the height of the engaging portion 34 is such that the engaging portion 34 engages with the abutment seat 43 when the base frame 19 in FIG. 3A is lowered. In the state in which the base frame 19 of 3 (B) is raised, the engaging portion 34 is largely separated from the abutment seat 43, and the dimensions are set such that the ladle cart 5 can freely enter and exit in the direction of the arrow 54.

  The ladle 6 has a well-known configuration, 38 is an inner bath steel storage space, 39 is a peripheral wall, 40 is a bottom member, 41 is a belt-shaped reinforcing member formed around the peripheral wall 39, and 42 is a ladle. 6 is a hook hook provided in a projecting state on both sides of the ladle 6 for use in lifting the crane with a crane, and 43 is a seat using a stepped portion on the lower side of the belt-like reinforcing member 41. Show.

The vacuum degassing equipment (RH) 3 as a secondary smelting furnace indicates the existence of one based on a well-known configuration. In the figure, 48 indicates a vacuum chamber, 49a indicates an ascending side dip tube, and 49b indicates the presence of a descending side dip tube.
Next, the ladle moving path 4 for the ladle cart shown in FIGS. 1 and 2 will be described. This route 4 represents the moving route of the ladle 6. The passages (4 a to 4 f) are paths for passing the ladle cart 5. 4a shows a turntable and the 1st ladle cart 5a receives the ladle 6 with the bath steel from a crane on it. The first ladle cart 5a turns 90 degrees and passes through the passage 4b toward "LF".

The implementation status of the above configuration will be described.
First, it is assumed that the first ladle trolley 5a is located on the turntable 4a in the ladle moving path 4 for the ladle trolley shown in FIGS. For example, a ladle 6 in which bath steel melted and refined by a smelting furnace or the like is stored is carried on a first ladle cart 5a by a crane (not shown) and placed in the state shown in FIGS. 4B and 4C. It is done. The ladle 6 changes its direction on the turntable 4a by 90 degrees and passes through the passage 4b toward "LF" as shown in FIG. 1B (see the flow line indicated by reference numeral 60 in FIG. 5). As described above, in “LF”, since the space 14 is vacant, the first ladle cart 5a enters the “LF” in the state of FIGS. 3 (A) and 4 (C). Next, the support means 18 and the receiving member 22 of the ladle storage mechanism 16 are lifted as shown in FIG. 3B, and the heating apparatus 10 is lowered as shown in FIG. Reference is made to the flow line indicated by reference numeral 62). On the other hand, since the ladle cart 5a has no ladle 6, it returns to the original position (turntable 4a) through the passage 4b (see the flow line indicated by reference numeral 61 in FIG. 5), and the next bath steel is stored. Prepare to receive the ladle 6.

  At the time when the refining process is completed in “LF”, there is a gap under which the second ladle cart 5b enters due to the removal of the first ladle cart 5a under the ladle 6 located in “LF”. 1B, the carriage shown by the one-dot chain line in FIG. 1B, that is, the second ladle carriage 5b advances in the direction of the arrow 56 through the passage 4c (the flow line indicated by reference numeral 63 in FIG. 5). See below) and go under the “LF”. Therefore, when the support means 18 and the receiving member 22 of the ladle storage mechanism 16 are lowered as shown in FIG. 3A, the ladle 6 is moved to the first position as shown in FIGS. 3A, 4B, and 4C. 2 Get on the ladle cart 5b. In this state, the second ladle cart 5b backs the passage 4c toward the turntable 4d (see the flow line indicated by reference numeral 64 in FIG. 5). Next, the second ladle trolley 5b is turned 180 degrees on the turntable 4d, and the passage 4e is moved to the next stage (for example, a vacuum degassing facility as a secondary smelting furnace, as shown in FIGS. 1B and 2A). Proceed to 3) (hereinafter also simply referred to as “RH”). In “RH”, the ladle 6 placed on the second ladle cart 5b is deposited in the ladle storage mechanism 16 and processed in “RH” in the same manner as described above in relation to “LF”. Proceed to the arrow 56 through the passage 4e, the turntable 4d, and the passage 4c, and prepare to receive the next ladle 6 near “LF” (see the flow line indicated by reference numeral 65 in FIG. 5).

Next, after the predetermined process is completed in “RH” (see the flow line indicated by reference numeral 66 in FIG. 5), a completely different third ladle cart 5c (FIG. 1 (B) ) And FIG. 2) receive the ladle 6 after the completion of the processing in “RH” in the same manner as described above in relation to “LF”, up to the position shown in FIG. 1 (B) and FIG. Return (refer to the flow line indicated by reference numeral 67 in FIG. 5). Here, the ladle 6 is carried away by a crane.
In the above explanation, in explaining the flow related to the refining work centered on one ladle 6, the examples using the first ladle trolley 5a to the third ladle trolley 5c have been explained. As shown in FIG. 2, the ladle 6 that requires refining is repeatedly carried on the first ladle cart 5a located on the turntable 4a in FIGS. 1 and 2, and the above operations are repeated. It is.

By adopting such a ladle refining method, the ladle cart 5a and the ladle cart 5b can be operated efficiently even in a limited and narrow site as is apparent from FIGS. As shown in FIG. 5, the ladle refining apparatus has a short downtime, and the ladle can be refined continuously and efficiently.
In the description of the figure, the configuration used in relation to “RH” is the configuration described in the technical matters related to the configuration of “LF” described in FIGS. For technical matters that can be considered to be the same in terms of functions and the like, the same reference numerals as those described above are assigned, and redundant descriptions are omitted.

These are the top views which show the positional relationship of the ladle refining apparatus and vacuum degassing equipment (RF) in an out-of-furnace refining equipment, (A) is the state without the ladle cart 5, (B) is the ladle cart 5 Shows the state of placement. (A) and (B) are front schematic diagrams for explaining the positional relationship among a ladle refining device, a vacuum degassing facility, a ladle carriage 5 and a ladle 6 in an out-of-furnace refining facility. (A) and (B) are partially broken front views for explaining the positional relationship among the ladle storage mechanism 16, the ladle cart 5, and the ladle 6. (A) and (B) are plan views for explaining the relative positions between before and after placing the ladle 6 on the ladle carriage 5. (C) The figure is the front view seen from the right side of (B) figure, Comprising: It is a front view for demonstrating the relationship between the ladle trolley 5, the ladle 6, and the ladle custody mechanism 16. FIG. These show the cycle time table for demonstrating the relationship between the ladle trolley | bogie 5, the ladle refining apparatus 2, and the vacuum degassing equipment of a prior art example and a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Out-of-furnace refining equipment, 2 ... Ladle refining equipment (LF), 3 ... Vacuum degassing equipment, 4 ... Ladle movement route, 5 ... Ladle cart, 6. -Ladle, 10 ... heating device, 11 ... furnace lid, 12 ... electrode, 14 ... space, 16 ... ladle storage mechanism, 17 ... device installation location (pit), DESCRIPTION OF SYMBOLS 18 ... Support means, 19 ... Base frame, 20 ... Guide means, 21 ... Vertical drive device, 22 ... Receiving member, 23 ... Receiving part, 24 ... Member to support , 25 ... Underframe, 26 ... Wheel, 27 ... Drive control section, 28 ... Ladle mounting area, 29 ... Receiving member through-hole, 30 ... Escape part for escape 32 ... Ladle support member, 33 ... Base part, 34 ... Tip part (engagement part), 38 ... Bath steel storage space, 39 ... Perimeter wall, 40 ... Bottom member , 41 ...・ Reinforcing member, 42... Hook hook, 43.

Claims (1)

The furnace lid to cover the ladle is equipped with an electrode to heat the bath steel in the ladle,
On the other hand, on the lower side of the furnace lid, there is a space in which the ladle mounted on the ladle cart can enter and exit,
A ladle is positioned below the furnace lid, the furnace lid is attached to the ladle, power is supplied to the electrode, and the bath steel in the ladle is heated and refined. In pot refining equipment,
A ladle storage provided with a receiving member for receiving the ladle and a supporting means for moving up and down while supporting the receiving member, below the space in which the ladle mounted on the ladle cart is accessible. Set up the mechanism,
On the other hand, around the space, at least two passages that allow the selective movement of the ladle cart with respect to the space are provided, and the passages reciprocate toward the space, respectively. Arrange the ladle cart freely,
The ladle mounting area in each ladle carriage has a through hole for allowing the receiving member in the ladle storage mechanism to move up and down, and a receiving member or support in the ladle storage mechanism that has been raised through the through hole. In order to allow the means to escape to the side, a ladle is provided on the side of the through hole, and the ladle is received by the receiving member in the ladle storage mechanism, and the ladle is placed below the ladle. A ladle refining device characterized in that the cart can be freely moved in and out.

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