JPS6019799Y2 - Heat retention device for continuous casting strands - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a heat retention device for continuously cast strands.

Recently, a method has been adopted in which a rolling mill is placed on a casting line as rear equipment for continuous casting to directly roll strands to be continuously cast.

This is noteworthy because it is possible to reduce the number of steps required to obtain rough rolled or final rolled products, and it also leads to a reduction in the installation area due to the effective arrangement of various equipment.

By the way, the continuous casting strand that is continuously cast has a considerable high temperature heat as molten metal when it is cast into the mold, and after the heat is removed in the mold, as it moves while being guided by guide rollers. It is directly cooled by cooling water and drawn downward along an arcuate path.

During this time, the inside of the strand was unsolidified, but it gradually solidified and was further moved to the rear equipment.

In this case, the continuously cast strand must be kept sufficiently hot for rolling during the travel path, especially during the long horizontal portion.

That is, heat dissipates from the surface of the solidified strand due to natural cooling, so this must be prevented by some means.

At the same time, when looking at the heat dissipation characteristics from the surface of the strand, it becomes a problem that there is a lot of heat dissipation from the corners, and this area becomes supercooled, resulting in uneven temperature distribution of the strand. This will impede the rolling function when it is rolled later.

SUMMARY OF THE INVENTION Therefore, the present invention provides an apparatus capable of keeping continuously cast strands warm during the conveyance path in order to maintain the necessary heating temperature for rolling in a subsequent rolling mill.

An embodiment of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a mold, in which molten steel is injected from a tundish 2 and at the same time cooled within the mold 1, becoming a continuously cast strand 3 having an unsolidified portion inside, and subsequently passing through an arcuate guide path 4 disposed below. Moving.

At this time, it is directly cooled by a large number of nozzles (not shown) arranged between the shoe plate and the guide rollers that constitute the arcuate guide path 4.

Pinch rollers 5 are arranged at the point where the arcuate guide path 4 turns horizontally, thereby providing correction and a pulling force.

At this point, the interior of the continuous casting strand 3 is almost completely solidified.

The strand 3 pulled out by the rear end of the pinch roller 5 moves further rearward.

6 is a frame cutter, and the frame cutter 6
The dummy buff connected to the leading end of the strand 3 is cut and separated.

The separated dummy buff moves on the front conveyance table 11 ahead of the subsequent continuous casting strand 3 while keeping the crop combined, and is side-shifted by the dummy buff storage device 9 interposed in the rear conveyance table 8. .

Reference numerals 23A and 23B are a pair of tunnel-shaped movable heat-insulating wall plates that cover the dummy side shift position of the transfer table 8, and 25 in FIGS. Wheels 51, which are crimping fixing members that are fixed so as not to move from side to side and are rotatably supported by brackets 50 protruding from the upper surface of each of the heat-insulating wall plates 23A and 23B, are mounted above the conveyance table 8. The movable heat-insulating wall plates 23A, 23B are rotatably supported by each pair of guide rails 52A, 2B disposed along the conveyance direction of the 8, respectively.
It is suspended from B.

Reference numeral 53 denotes a rack fixedly installed on the upper surface of each moving heat-insulating wall plate 23A, 23B along the longitudinal direction of each heat-insulating plate 23A, 23B, and 54 is a pinion that fits the rack, and 54 is a pinion that is fitted to the rack, and is connected to the guide rail 52A, 52B. The drive motor 56 with a reduction gear is fixed to the cross beam 55 that supports the drive motor 56 for forward and reverse rotation.

Therefore, as shown in the solid line in Fig. 1, the circular moving heat insulation wall plate 23
When the dummy buff separated from the strand 3 is brought onto the table 8 while the conveying table 8 is covered by the conveyor table 8 by A and 23B, the motor 56 is driven to transfer the dummy buff to both heat-insulating wall plates 23 via the pinion 54 and the rack 53.
A.

23B are moved in the direction away from each other to bring them into the state shown by the imaginary lines in FIG. Both insulation wall panels 23
A and 23B may be brought close to each other to obtain the state shown by the solid line in FIG.

Then, when the following strand 3 moves on the table 8, this strand 3
, 23B to prevent natural cooling.

Note that a heat insulating material is pasted over the entire surface of the inner surface of each of the heat retaining wall plates 23A and 23B.

Further, the continuous casting strand 3 that follows the dummy buff is cut into a predetermined length by the frame cutter 6 that moves in the advancing direction in synchronization with the strand 3, and is cut into a predetermined length by the conveyance table 11 disposed in the lower part of the frame cutter monitoring room 10.
After that, it is further moved from the rear conveyance table 8 to a rolling mill which is rear equipment.

Reference numeral 13 denotes a tunnel-shaped heat insulating wall plate which is fixedly installed along the conveyance table 11 to have a length substantially equal to the length thereof, and which insulates the strand 3 moving on the table 11. It is pasted over the inner surface of the strand 3, and almost the entire circumference of the strand 3 is wrapped, except for only the bottom, leaving a slight gap between the top and side surfaces of the strand 3.

Reference numeral 57 denotes a tunnel-shaped heat insulating wall plate which is fixed along the conveyance table 58 extending downwardly from the conveyance table 8 and whose length is substantially equal to the length of the conveyance table 58 to keep the strands moving on the table 58 warm. It has the same structure as the heat insulation wall board 13 above.

In the above embodiment, the movable heat-retaining wall plates 23A and 23B are divided into two parts, but they may be integrated into one piece or divided into three or more parts.

Especially if the dummy buff is short, one of the insulation wall plates 23
A or 23B alone is sufficient.

Further, although the heat insulating wall plates 23A and 23B are configured to be moved back and forth by the rack 53 and pinion 54, other methods such as chain drive or hydraulic cylinders may be considered.

As described above, according to the continuous casting strand heat retention device of the present invention, a pair of front and rear guide rails 52A and 52B are provided above the conveyance table 8 which is disposed continuously from the arcuate guide path 4 of the strand, The pair of guide rails 52A, 52B are provided with tunnel-shaped movable heat-insulating wall plates 23A, 23B that cover the strand withdrawal position, and the heat-insulating wall plates 2
3A.

After installing a drive device 56 for moving the 23B toward and away from each other along the conveyance direction of the conveyance table 8,
After pulling out the strand 3, when the dummy buff separated from the strand 3 reaches a predetermined position on the conveying table 8, the driving device 56 moves the heat insulating wall plate 23A accordingly.
. The strands 3 can be kept warm by the heat-insulating wall plates 23A and 23B.

Therefore, the strand 3 can be delivered to the subsequent rolling mill while being maintained at a high temperature, and rolling can be carried out extremely effectively.

Furthermore, when the dummy bar is removed, heat-insulating wall plates are spaced on both sides, allowing the long dummy bar to be side-shifted.Furthermore, its guide rail is provided above the strand guide path, making maintenance of the transport table easier. It's easy.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention. Figure 1 is an overall schematic side view;
FIG. 2 is a longitudinal cross-sectional view taken along the line ■--■ in FIG. 1. 3...Strand, 4...Circular guide path, 7...Dummy bar, butt...Transportation table, 23A, 23B...Moving heat insulation wall Board, 53・
... Rack, 54 ... Pinion, 56.
...Drive motor (drive device).

Claims (1)

[Scope of utility model registration request] A pair of front and rear guide rails 52A, 52B is provided above a conveyance table 8 which is disposed continuously from the circular arc guide path 4 of the strand in continuous casting equipment, and the strand withdrawal position is set on the pair of guide rails 52A, 52B. Continuous casting characterized in that a covering tunnel-shaped movable heat-insulating wall plate 23A, 23B is provided, and a driving device 56 for moving the heat-insulating wall plate 23A, 23B toward and away from each other along the conveyance direction of the conveyance table 8 is provided. Strand insulation device.