JPH0638602Y2 - Dummy bar for vertical continuous casting machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a continuous casting facility, particularly a dummy bar used in a vertical continuous casting machine.

Prior art In continuous casting, as shown in FIG. 4, the dummy bar runs backward from the pinch roll 1 for pulling out the slab,
The tip of the dummy bar 2 is inserted into the water-cooled mold 3 and stopped at a predetermined position. After that, the flow down of the molten steel cast from the tundish 4 is interrupted once, and after the start of solidification of the molten steel outer shell wall, the casting is continued and the dummy bar and the continuous slab connected thereto are pulled down via the pinch roll 1.

At the start of casting, the probability of breakout is particularly high due to insufficient formation of the outer shell wall and many instability factors in the early stages of casting that involve changes in cast steel type and changes in slab size. Many are seen.

During breakout that occurs in the early stages of casting, the molten steel often leaks to the vicinity of the upper part of the dummy bar, and the leaked molten steel is inserted into a roll and the slab cannot be pulled out.

When such trouble occurs, the conventional practice is to remove the steel leaks adhering to the dummy bar, and if it is difficult to remove it, cut the dummy bar from the appropriate location in the width direction, pull out leaving the tip, and discard the tip. It was restored by newly manufacturing the part corresponding to and adding it by electric welding.

Problems to be Solved by the Invention In the conventional method as described above, even if the steel attached to the dummy bar is removed or the dummy bar is cut from an appropriate place, it is a high temperature, high humidity, and a narrow place. The work was difficult, the time required for restoration was long, the loss of equipment was large, and the restoration cost was high.

An object of the present invention is to solve the above problems and to provide a dummy bar that can be easily separated and easily restored even in a place where the working environment is narrow.

Means and Actions for Solving the Problems Therefore, in the dummy bar of the present invention, in the dummy bar in which the tip end is a separate body and is separably connected by the key, the key has a hook shape having an H-shaped cross section at both longitudinal ends. And the cross section of the central portion in the longitudinal direction is formed in a T or I shape. On the other hand, the dummy bar has engaging grooves at the joints between the tip portion and the main body, and each engaging groove is The cross-sections of both ends are formed in a substantially C shape, and the central portion is formed in a concave shape, and the engaging portion is configured to be disengaged by moving the key until it reaches the concave groove. Is characterized by.

According to the present invention, when the tip end is separated due to the inability to pull out due to the breakout, the key is pushed to move the engaging portion to the groove of the concave shape or the like, and the key is locked at both ends. The engaging portion can be disengaged from the engaged portion by moving only the existing length. Therefore, since it is not necessary to remove the key to separate the tip portion, it is possible to reduce the working space required to the side of the dummy bar.
That is, even if the space on the side of the dummy bar is narrow, the tip portion can be separated from the main body.

After the separation, the main body is pulled out, and the separately prepared tip portion is connected with the key to restore it. It should be noted that the tip portion can also be restored and used by removing the molten steel that has been covered during breakout.

Embodiment FIG. 1 shows a use state of a dummy bar according to the present invention, in which a tip portion is composed of two blocks, a tip block 11 and an intermediate block 12, and the intermediate block 12 has a tip block 11 and a tip block 11 at both connection ends thereof. The main body 13 and the key 14 are connected so as to be removable. As shown in detail in FIG. 2, the key 14 has an H-shaped cross-sectional shape at both longitudinal ends and a T-shaped central portion, while the blocks 11 and 12 and the main body.
As shown in FIG. 3, the connecting portion of 13 is formed with a groove 19 having a substantially C-shaped cross section at both ends and a groove 20 having a concave cross-section at an intermediate portion, and the H-shaped portion of the key 14 can be slid into the groove 19. The groove 20 is adapted to be detachable.

The key 14 also has a gradient on the engaging surfaces 18 forming the H-shaped portions at both ends, and uses the wedge action of the gradient to combine the tip block 11 and the intermediate block 12 and the intermediate block 12 and the main body 13.
If the gradient portions 18 of the key 14 are pushed into the H-shaped grooves at both ends of the groove formed by the combination of the above combinations, the gradients are attached in the directions in which they are in close contact with each other so that they can be in close contact with each other. In addition, when removing the key, a gap is created by slightly moving the key, and after that, the key can be easily moved, so that the key can be easily removed.

The key 14 also has a side plate at one end as shown in FIG.
15 is attached to fix the key to the dummy bar.

Further, when pulling out the key 14, if a pulling-out cylinder (not shown) is mounted on the side surface of the dummy bar and is pulled out by hydraulic pressure, it can be pulled out easily. Since the pulling-out work can be performed from the side of the dummy bar without the roll or the spray tube for cooling the slab, the key can be attached / detached without disturbing the peripheral equipment such as the guide roll 16.

Effect of the Invention The present invention is configured as described above and has the following effects.

According to the dummy bar of the first aspect, when the cast piece cannot be pulled out due to the breakout, by separating the tip end portion, the lower dummy bar body can be reliably pulled out downward without being caught. After withdrawal, the tip prepared in advance can be easily restored by connecting it with a key, and since the tip can be separated and replaced in a short time, it is possible to improve the operating rate of the continuous casting machine, The tip covered with molten steel can be easily restored by removing the adhered steel, and the entire dummy bar can be restored inexpensively and easily, and the amount of inserting and removing the key for attaching and detaching the tip is small. Even if the space on the side of the dummy bar is narrow, the key can be inserted and removed, and the tip portion can be easily separated.

According to the dummy bar of claim 2, in consideration of workability,
Alternatively, the blocks can be separated at a suitable place for the work in consideration of how the molten steel is inserted, and the required blocks can be cut if necessary. Even in this case, it is possible to easily perform restoration by replacing a required block, and at the same time, it is possible to reduce the truncation amount.

[Brief description of drawings]

FIG. 1 is a perspective view showing the use of a dummy bar according to the present invention, FIG. 2 is a perspective view of a key, FIG. 3 is a perspective view showing a part of the key in section, and FIG. It is a schematic sectional drawing of a casting machine. 11 …… Tip block, 12 …… Intermediate block 13 …… Main body, 14 …… Key

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshitaka Hirooka 11-11 Showa-cho, Kure City, Hiroshima Prefecture Nisshin Koki Co., Ltd. (72) Inventor Daizo Munenobu 11-11 Showa-cho, Kure City, Hiroshima Prefecture Nissin Koki Co., Ltd. (56) References Actual Development Sho 52-84916 (JP, U) Actual Public Sho 52-11935 (JP, Y2) Actual Public Sho 52-53695 (JP, Y2)

Claims (2)

[Scope of utility model registration request] 1. A dummy bar for use in a vertical continuous casting machine, the tip of which is a separate body and which is separably connected by a key, wherein the key has a hook-like cross-section at both longitudinal ends. And the cross section of the central portion in the longitudinal direction is formed in a T or I shape. On the other hand, the dummy bar has engaging grooves at the joints between the tip portion and the main body, and each engaging groove is The cross-sections of both ends are formed in a substantially C shape, and the central portion is formed in a concave shape, and the engaging portion is configured to be disengaged by moving the key until it reaches the concave groove. Dummy bar characterized by. 2. The dummy bar according to claim 1, wherein the tip portion is composed of a plurality of blocks, and each block is separably connected by the key.