JP4672699B2 - Dummy bar for continuous casting and continuous casting machine - Google Patents

Description

  The present invention relates to a continuous casting dummy bar and a continuous casting machine for curving and drawing a slab during continuous casting.

  Generally, an iron mill or the like is provided with a continuous casting machine for continuously producing a slab obtained by casting molten steel. In this continuous casting machine, after inserting the tip of the dummy bar into the lower opening of the cylindrical mold having openings at the top and bottom, the molten steel is injected from the upper opening, and the molten steel is poured into the tip. Solidified and bonded, and this molten steel is continuously drawn downward from the mold through a dummy bar, thereby producing a slab having a uniform cross section such as a round shape or a square shape. Then, after solidification has progressed to the inside of the manufactured slab, by cutting this slab into a predetermined length, it is possible to obtain a steel strip (slab or strip) as a material in a subsequent process such as rolling. it can.

  Further, since the slab is pulled out by bending the dummy bar, the dummy bar is required to have flexibility. For this reason, many link-type bars having a multi-stage link structure in the slab drawing direction are employed for the dummy bars.

  However, when a link-type dummy bar is bent and pulled out, backlash in the pull-out direction tends to occur at each connecting portion of the link structure. As a result, the molten steel surface in the mold fluctuates up and down and the pulling force fluctuates, which may adversely affect the quality of the slab.

  In view of this, various link-type dummy bars that prevent rattling when the slab is bent and pulled out have been provided. Such conventional continuous casting dummy bars are disclosed in, for example, Patent Documents 1 and 2.

Japanese Patent Laid-Open No. 10-314898 JP 2006-26647 A

  In the structure of Cited Document 1, an elastically flexible core member is passed through a plurality of sleeve members arranged in the pulling direction, and the sleeve member and the core member are fixed with bolts. Yes.

  However, in such a structure, a curved surface along the curved core member must be formed in the through hole of the sleeve member, and the structure becomes complicated. Furthermore, in order for the dummy bar to bend, a predetermined amount of clearance is required between the bolt and the bolt hole formed in the sleeve member and the core member in anticipation of the curve of the dummy bar. It is difficult to prevent.

  Moreover, in the structure of the cited document 2, while providing the leaf | plate spring which has elastic flexibility on the upper surface of the some link member arranged in the extraction direction, the lower part of an adjacent link member becomes a rotating shaft. They are connected with connecting pins.

  However, in such a structure, when the dummy bar is bent, the leaf spring is disposed on the inner periphery side of the dummy bar, while the connecting pin is disposed on the outer periphery side of the dummy bar, and the curvature radius of the leaf spring and the curvature of the link member There will be a difference in radius. In order to absorb this difference in radius of curvature, a predetermined amount of clearance is required in the connecting portion that connects the link member and the leaf spring, and in the link portion between the link member and the connecting pin. It is difficult to prevent.

  Accordingly, an object of the present invention is to provide a continuous casting dummy bar and a continuous casting machine that can prevent rattling when a slab is bent and pulled out.

The continuous casting dummy bar according to the present invention for solving the above-mentioned problems is
It is a dummy bar for continuous casting for curving and pulling out a slab when continuously casting,
A plurality of link blocks arranged on both sides of the slab drawing direction and in the slab drawing direction;
A connecting pin that rotatably connects the link blocks adjacent to each other in the slab drawing direction ;
Between the two rows of the link blocks arranged on both sides of the slab extraction direction, a plate member extending in the slab extraction direction and elastically flexible ,
A holding member that is provided on an inner surface in the width direction of the link block and holds the plate member ;
An end block connected to the link block disposed on the most downstream side in the slab drawing direction via the connection pin;
The link block is provided between the downstream end of the plate member in the slab drawing direction and the terminal block, and the link block is formed into a slab by expanding between the downstream end of the plate member in the slab extraction direction and the terminal block. A pulling means for pulling downstream in the pulling direction,
When the connecting pin and the holding member are arranged at the same position in the thickness direction of the link block, and the slab is bent and pulled out, the curvature radius of the two rows of link blocks and the curvature of the plate member The feature is that the radius is the same .

Dummy bar for continuous casting according to the present invention for solving the above-
Characterized in that it comprises a connecting means for connecting said link block facing each other in the slab width direction.

The continuous casting machine according to the present invention for solving the above-mentioned problems is
The continuous casting dummy bar according to the present invention is inserted into the lower opening of the mold, and the molten metal injected into the mold is drawn out through the continuous casting dummy bar to produce a cast piece. And

  According to the continuous casting dummy bar and the continuous casting machine according to the present invention, the connecting pin and the plate member, which are the rotation center of the link block, are arranged at the same position in the thickness direction of the link block. When pulling out, the link block and the plate member have substantially the same radius of curvature. Thereby, since the clearance gap between adjacent link blocks can be expanded by the curved board member, the backlash between a link block and a connection pin can be prevented.

  Hereinafter, a continuous casting dummy bar and a continuous casting machine according to the present invention will be described in detail with reference to the drawings. In addition, about the member which has the same structure and function in each Example, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted. Moreover, the arrow in a figure has shown the drawing direction of slab.

  FIG. 1 is a schematic configuration diagram of a continuous casting machine provided with a continuous casting dummy bar according to the present invention, FIG. 2 is a schematic diagram of a continuous casting dummy bar according to a first embodiment of the present invention, and FIG. The side view of the dummy bar at the time, (b) is a front view thereof, and FIG. 3 is a perspective view showing a holding state of the thin plate by the holding pins.

  As shown in FIG. 1, a curved continuous casting machine 1 is provided with a cylindrical mold 12 having a rectangular cross section. A cooling circuit (not shown) that cools the casting mold 12 by circulating a cooling medium is provided inside the casting mold 12. A dummy bar head 14 provided at the tip of the dummy bar 13 is inserted into the lower opening of the mold 12. A seal member (not shown) that closes the gap between the mold 12 and the dummy bar head 14 is interposed between the inner wall of the lower opening of the mold 12 and the dummy bar head 14. Molten steel (molten metal) 11 is injected into the opening of the mold 12 whose upper surface is the pseudo bottom.

  Further, below the mold 12, a plurality of cooling means such as a cooling spray (not shown) and support rolls 15 are arranged in a circular arc shape at a predetermined interval. Thereby, a conveyance path for pulling out the dummy bar 13 is formed. A pair of upper and lower pinch rolls 16 are rotatably supported on the downstream side of the conveyance path in the pulling direction, and a driving device (not shown) is connected to the pinch roll 16. That is, by driving the drive device, the pinch roll 16 is rotationally driven, and the dummy bar 13 is pulled out.

  As shown in FIGS. 2A and 2B, a dummy bar head 14 is provided at the tip of the dummy bar 13. The dummy bar head 14 is inserted into the lower opening of the mold 12, that is, the cross-sectional shape of the slab that is cooled, solidified and pulled out is substantially the same as the cross-sectional shape of the dummy bar head 14.

  The dummy bar head 14 is formed with dovetail grooves 21 that open in the width direction (longitudinal direction). The dovetail groove 21 has an upper opening portion 21a that opens to the upper surface of the dummy bar head 14, and a lower opening portion 21b that communicates with the lower portion of the upper opening portion 21a. The length (thickness) of the dummy bar head 14 in the thickness direction in the lower opening 21b is longer (thicker) than the length (thickness) in the upper opening 21a.

  A plurality of link blocks 31 arranged in the pulling direction are provided on both sides of the lower surface of the dummy bar 13, and the adjacent link blocks 31 are connected to each other by a connecting pin 33 so as to be rotatable. The link block 31 on the most upstream side in the drawing direction is rotatably connected to the lower surface of the dummy bar head 14 by a connecting pin 33, while the link block 31 on the most downstream side in the drawing direction is connected to the end block 32 by a connecting pin 33. Is pivotably connected to the upper surface of the.

  Thus, by connecting using the connecting pin 33, the link block 31 and the terminal block 32 can be rotated in the vertical direction about the connecting pin 33 as a rotation axis. The dummy bar 13 can be bent and pulled out.

  The link block 31 and the end block 32 are formed to have substantially the same thickness as the dummy bar head 14. The central axis of the connecting pin 33 is disposed at the same position in the thickness direction of the dummy bar head 14, the link block 31, and the terminal block 32 in the thickness direction.

  A holding pin (holding member) 35 is supported on the inner surface of each link block 31. The central axis of the holding pin 35 is disposed at the same position in the thickness direction of the link block 31 in the thickness direction. As shown in FIG. 3, a slit 35 a is formed at the tip of the holding pin 35 so as to extend in the drawing direction through the central axis.

  An elastically flexible thin plate (plate member) 34 is provided between the link blocks 31 connected on both sides of the dummy bar 13 in the pulling direction, and both ends of the thin plate 34 are in the slits 35a of the holding pins 35. Is held in. Further, the upstream end of the thin plate 34 in the pulling direction is fixed to the lower surface of the dummy bar head 14 via the fixing bracket 36, while the downstream end of the pulling direction is supported on the upper surface of the terminal block 32 via a spring (pulling means) 37. ing.

  The fixing bracket 36 is disposed at the same position in the thickness direction as the middle portion of the dummy bar head 14 in the thickness direction. On the other hand, the spring 37 is disposed at the same position in the thickness direction as the intermediate portion of the end block 32 in the thickness direction. The spring 37 is supported in a compressed state between the terminal block 32 and the thin plate 34, and the terminal block 32 is urged downstream in the pulling direction by the urging force of the spring 37. As a result, the link blocks 31 connected on both sides of the dummy bar 13 in the pulling direction are pulled downstream in the pulling direction.

  That is, by holding both ends of the thin plate 34 in the slit 35 of the holding pin 35, the upper end thereof is fixed by the fixing bracket 36, and the lower end thereof is supported by the spring 37. And it arrange | positions in the same position in the intermediate part of the thickness direction in the terminal block 32, and those thickness directions.

  Therefore, when the continuous casting machine 1 is operated, first, the dummy bar head 14 is inserted into the lower opening of the mold 12 and then the opening of the mold 12 with the upper surface of the dummy bar head 14 as a pseudo bottom from the upper opening. Molten steel 11 is injected into the part. When the bath surface of the molten steel 11 stored in the opening of the mold 12 reaches a predetermined height, the dummy bar head 14 is pulled out via the dummy bar 13 by the rotational drive of the pinch roll 16.

  At this time, the molten steel 11 to be stored is cooled by the inner wall of the mold 12 so that the outer side thereof is covered with the solidified shell and enters the dovetail groove 21 to be solidified and bonded to the dummy bar head 14. By pulling out the dummy bar head 14 through the dummy bar 13 in this state, a slab having a cross-sectional shape substantially the same as the cross-sectional shape of the dummy bar head 14 is continuously manufactured.

  Next, the continuously drawn slab is further cooled by a cooling means such as a cooling spray as it is conveyed between the support rolls 15. Then, after solidification has progressed to the inside of the slab, this slab is cut to a predetermined length to obtain a steel strip (slab or strip) that is a material in a subsequent process such as rolling.

  Here, at the time of pulling out the slab described above, the connecting pin 33 that is the rotation center of the link block 31 and the thin plate 34 that is held by the link block 31 via the holding pin 35 are the thickness of the link block 31. The thin plate 34 is held in the same position in the vertical direction, and is slidably held in the slit 35 a of the holding pin 35 in the drawing direction. Thus, when the dummy bar 13 is bent, the thin plate 34 is not restrained with respect to the link block 31 and is bent with a curvature radius substantially the same as the curvature radius of the linked link block 31.

  Therefore, since the gap between the dummy bar head 14 and the link block 31, between the adjacent link blocks 31, between the link block 31 and the terminal block 32 is expanded by the curved thin plate 34, the dummy bar head 14, It is possible to prevent backlash in the pulling direction between the link block 31 and the terminal block 32 and the connecting pin 33.

  Further, the end block 32 is always urged to the downstream side in the drawing direction by the urging force of the spring 37, so that the space between the thin plate 34 and the end block 32 is expanded. As a result, the linked link block 31 is pulled to the downstream side in the pulling direction, thereby further preventing backlash in the pulling direction between the dummy bar head 14, the link block 31, and the terminal block 32 and the connecting pin 33. it can.

  As a result, the dummy bar 13 can be pulled out smoothly, and the molten metal surface of the molten steel 11 in the mold 12 does not fluctuate up and down and the pulling force does not fluctuate. Can do.

  Therefore, according to the dummy bar for continuous casting according to the present invention, the connecting pin 33 that is the rotation center of the link block 31 and the holding pin 35 that holds the thin plate 34 on the link block 31 are arranged in the thickness direction of the link block 31. Since the connecting pin 33 and the thin plate 34 are disposed at the same position in the thickness direction of the link block 31, the link block 31 and the thin plate 34 are pulled out with substantially the same radius of curvature. be able to. As a result, the curved thin plate 34 expands the gaps between the dummy bar head 14 and the link block 31, between the adjacent link blocks 31, and between the link block 31 and the terminal block 32. It is possible to prevent backlash in the pulling direction between the link block 31 and the terminal block 32 and the connecting pin 33.

  Further, since the end block 32 can always be biased downstream in the pulling direction by the biasing force of the spring 37, the connected link block 31 can be pulled downstream in the pulling direction. Thereby, it is possible to further prevent backlash in the pulling direction between the dummy bar head 14, the link block 31, and the terminal block 32 and the connecting pin 33.

  4A and 4B are schematic views of a dummy bar for continuous casting according to a second embodiment of the present invention, wherein FIG. 4A is a side view of the dummy bar at the time of drawing, FIG. 5B is a front view thereof, and FIG. It is a perspective view which shows the holding state.

As shown in FIGS. 4A and 4B, on both sides of the dummy bar 41 in the drawing direction, link blocks 31 that are rotatably connected by connecting pins 33 are arranged in the drawing direction. A holding rod (holding member, connecting means) 51 is supported between the inner surfaces of the opposed link blocks 31 so as to be orthogonal to the drawing direction. The central axis of the holding rod 51 is disposed at the same position in the thickness direction in the link block 31 and in the thickness direction. As shown in FIG. 5, the holding rod 51 is formed with a slit 51 a that passes through the central axis in the drawing direction. A thin plate 34 is provided between the link blocks 31 connected on both sides of the dummy bar 41 in the drawing direction. The thin plate 34 is held in a slit 51 a of the holding rod 51.

  That is, the thin plate 34 is held through the slit 51 of the holding rod 51, the upper end thereof is fixed by the fixing bracket 36, and the lower end thereof is supported by the spring 37. The end block 32 is disposed at the same position in the thickness direction intermediate portion and in the thickness direction thereof.

  Therefore, when operating the continuous casting machine 1, first, the dummy bar head 14 is inserted into the lower opening of the mold 12, and then the opening of the mold 12 having the upper surface of the dummy bar head 14 as a pseudo bottom from the upper opening. Molten steel 11 is injected into the part. When the bath surface of the molten steel 11 stored in the opening of the mold 12 reaches a predetermined height, the dummy bar head 14 is pulled out via the dummy bar 41 by the rotational drive of the pinch roll 16.

  At this time, the molten steel 11 to be stored is cooled by the inner wall of the mold 12 so that the outer side thereof is covered with the solidified shell and enters the dovetail groove 21 to be solidified and bonded to the dummy bar head 14. By pulling out the dummy bar head 14 through the dummy bar 41 in this state, slabs having a cross-sectional shape substantially the same as the cross-sectional shape of the dummy bar head 14 are continuously manufactured.

  Next, the continuously drawn slab is further cooled by a cooling means such as a cooling spray as it is conveyed between the support rolls 15. Then, after solidification has progressed to the inside of the slab, this slab is cut to a predetermined length to obtain a steel strip (slab or strip) that is a material in a subsequent process such as rolling.

  Here, at the time of pulling out the slab described above, the connecting pin 33 that is the rotation center of the link block 31 and the thin plate 34 that is held by the link block 31 via the holding rod 51 are the thickness of the link block 31. Since the thin plate 34 is slidably held in the slit 51a of the holding rod 51 so as to be slidable in the drawing direction, the thin plate 34 is attached to the link block 31 when the dummy bar 41 is curved. Instead of being constrained, it is curved with a curvature radius substantially the same as the curvature radius of the linked link block 31.

  Therefore, since the gap between the dummy bar head 14 and the link block 31, between the adjacent link blocks 31, between the link block 31 and the terminal block 32 is expanded by the curved thin plate 34, the dummy bar head 14, It is possible to prevent backlash in the pulling direction between the link block 31 and the terminal block 32 and the connecting pin 33.

  Further, the end block 32 is always urged to the downstream side in the drawing direction by the urging force of the spring 37, so that the space between the thin plate 34 and the end block 32 is expanded. As a result, the linked link block 31 is pulled to the downstream side in the pulling direction, thereby further preventing backlash in the pulling direction between the dummy bar head 14, the link block 31, and the terminal block 32 and the connecting pin 33. it can. Moreover, since the opposing link blocks 31 are connected by the holding rod 51, backlash in the width direction can be prevented.

  As a result, the dummy bar 41 can be pulled out smoothly, and the molten metal surface of the molten steel 11 in the mold 12 does not fluctuate up and down and the pulling force does not fluctuate. Can do.

Therefore, according to the dummy bar for continuous casting according to the present invention, the connecting pin 33 that is the rotation center of the link block 31 and the holding rod 51 that holds the thin plate 34 on the link block 31 are arranged in the thickness direction of the link block 31. Since the connecting pin 33 and the thin plate 34 are disposed at the same position in the thickness direction of the link block 31, the link block 31 and the thin plate 34 are pulled out with substantially the same radius of curvature. be able to. As a result, the curved thin plate 34 expands the gaps between the dummy bar head 14 and the link block 31, between the adjacent link blocks 31, and between the link block 31 and the terminal block 32. It is possible to prevent backlash in the pulling direction between the link block 31 and the terminal block 32 and the connecting pin 33.

  Moreover, since the opposing link blocks 31 are connected by the holding rod 51, expansion / contraction between the opposing link blocks 31 can be suppressed, and play of the dummy bar 41 in the width direction can also be prevented.

  FIG. 6 is an enlarged view of the terminal end of the continuous casting dummy bar according to the third embodiment of the present invention.

  The dummy bar 61 shown in FIG. 6 is provided with bolts (pulling means) 71 instead of the spring 37 shown in FIGS. A terminal block 72 is connected to the link block 31 on the most downstream side in the drawing direction via a connecting pin 33, and thus the terminal block 72 can be rotated up and down around the connecting pin 33 as a rotation axis. . A square hole 72a is opened in the terminal block 72, and a screw hole 72b is formed in the square hole 72a. The screw hole 72b penetrates the upper surface of the termination block 72 and is formed in the middle portion of the termination block 72 in the thickness direction. The bolt 71 is screwed into the screw hole 72 b of the terminal block 72, and the tip of the bolt 71 is in contact with the lower end surface of the thin plate 34.

  That is, by tightening the bolt 71, the tip of the bolt 71 presses the lower end surface of the thin plate 34, but the thin plate 34 has its upper end fixed by the fixing metal fitting 36 and does not move. The end block 72 moves to the downstream side in the drawing direction. As a result, the space between the thin plate 34 and the end block 72 is expanded, and the linked link block 31 is pulled downstream in the pulling direction, so that the dummy bar head 14, the link block 31, the end block 72 and the connecting pin are connected. It is possible to further prevent backlash in the pulling direction with respect to 33.

  Therefore, according to the dummy bar for continuous casting according to the present invention, the terminal block 32 can always be pressed to the downstream side in the drawing direction by tightening the bolt 71, so that the linked link block 31 is pulled to the downstream side in the drawing direction. Can do. Thereby, it is possible to further prevent backlash in the pulling direction between the dummy bar head 14, the link block 31, and the terminal block 32 and the connecting pin 33.

  FIG. 7 is a perspective view of a continuous casting dummy bar according to a fourth embodiment of the present invention.

  A dummy bar 81 shown in FIG. 7 is a dummy bar 13 shown in FIGS. 2 and 3 provided with a connecting rod 91 (connecting means).

That is, the two connecting rods 91 are supported between the inner surfaces of the opposing link blocks 31 so as to be orthogonal to the drawing direction. These connecting rods 91 are arranged to face each other with the thin plate 34 interposed therebetween. The diameter of the connecting rod 91 is formed to a length that does not affect the bending operation of the dummy bar 13.

  Therefore, according to the continuous cast dummy bar according to the present invention, since the opposing link blocks 31 are connected to each other by the connecting rod 91, expansion / contraction between the opposing link blocks 31 can be suppressed, and the width of the dummy bar 81 is reduced. Backlash in the direction can also be prevented.

In this embodiment, the connecting rod 91 is applied to the dummy bar 13 shown in FIGS. 2 and 3, but may be applied to the dummy bar 41 shown in FIGS. 4 and 5 and the dummy bar 61 shown in FIG. Is possible.

  In the above-described embodiment, the spring 37 is provided between the terminal block 32 and the thin plate 34. However, the spring 37 may be provided between the dummy bar head 14 and the thin plate 34. Absent. At this time, it may be provided between both or between either one. Further, although the continuous casting dummy bar according to the present invention is applied to a mold type continuous casting machine, the present invention is not limited thereto, and may be applied to, for example, a belt type or twin drum type continuous casting machine. .

  The present invention is applicable to a dummy bar for continuous casting that can control the molten metal surface in the mold during casting with high accuracy.

It is a schematic block diagram of the continuous casting machine provided with the dummy bar for continuous casting which concerns on this invention. It is the schematic of the dummy bar for continuous casting which concerns on 1st Example of this invention, Comprising: (a) is a side view of the dummy bar at the time of extraction, (b) is the front view. It is a perspective view which shows the holding state of the thin plate by a holding pin. It is the schematic of the dummy bar for continuous casting which concerns on 2nd Example of this invention, Comprising: (a) is a side view of the dummy bar at the time of extraction, (b) is the front view. It is a perspective view which shows the holding state of the thin plate by a holding rod. It is a termination | terminus enlarged view of the dummy bar for continuous casting which concerns on 3rd Example of this invention. It is a perspective view of the dummy bar for continuous casting which concerns on 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Continuous casting machine 11 Molten steel 12 Mold 13,41,61,81 Dummy bar 14 Dummy bar head 15 Support roll 16 Pinch roll 21 Dovetail groove 21a Upper opening 21b Lower opening 31 Link block 32 Terminal block 33 Connection pin 34 Thin plate 35 Holding pin 35a Slit 36 Fixing bracket 37 Spring 51 Holding rod 51a Slit 71 Bolt 72 End block 72a Square hole 72b Screw hole
91 connecting rod

Claims (3)

It is a dummy bar for continuous casting for curving and pulling out a slab when continuously casting,
A plurality of link blocks arranged on both sides of the slab drawing direction and in the slab drawing direction;
A connecting pin that rotatably connects the link blocks adjacent to each other in the slab drawing direction;
Between the two rows of the link blocks arranged on both sides of the slab extraction direction, a plate member extending in the slab extraction direction and elastically flexible,
A holding member that is provided on an inner surface in the width direction of the link block and holds the plate member;
An end block connected to the link block disposed on the most downstream side in the slab drawing direction via the connection pin;
The link block is provided between the downstream end of the plate member in the slab drawing direction and the terminal block, and the link block is formed into a slab by expanding between the downstream end of the plate member in the slab extraction direction and the terminal block. A pulling means for pulling downstream in the pulling direction,
When the connecting pin and the holding member are arranged at the same position in the thickness direction of the link block, and the slab is bent and pulled out, the curvature radius of the two rows of link blocks and the curvature of the plate member Damiba over a continuous casting and radius, characterized in that as the same. In the continuous casting dummy bar according to claim 1,
A continuous casting dummy bar, comprising a connecting means for connecting the link blocks facing each other in the slab width direction. 3. A slab is manufactured by inserting the tip of the continuous casting dummy bar according to claim 1 or 2 into a lower opening of the mold and drawing the molten metal injected into the mold through the continuous casting dummy bar. A continuous casting machine characterized by

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