JPS6232687Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a twin dummy bar for continuous casting equipment, and its purpose is to provide a twin dummy bar suitable for high-speed casting.

In continuous casting equipment for both slabs and twin blooms, when continuously casting slabs, a foot roll exclusively for slabs is placed above the guide roll group 1 that constitutes the slab conveyance path, as shown in Figure 1a and b. When continuously casting twin blooms, the mold 3 with foot rolls 2 and the support roll device 4, which are exclusively for slabs, are installed, as shown in FIGS. 2a and 2b. Generally, they are removed all at once, and a mold 6 with a foot roll 5 dedicated to twin bloom and a support roll device 7 are placed above the guide roll group 1. Therefore, the guide roll group 1 serves both as a slab and as a twin bloom. In the case of continuous slab casting shown in FIGS. 1a and 1b, the slab dummy bar 8 on a dummy bar (not shown) is inserted into the mold 3 from above, and the tail portion 8A is inserted into the drive roll 1A of the guide roll group 1. 1, release the hanging support of the head part 8B, rotate the drive roll 1A, pull out the slab dummy bar 8 in the direction of arrow A, and insert the head part 8B into the mold 3 as shown in FIG. 1a. , the continuous casting can be started, but at this time, as shown exaggeratedly in FIG.
The drive roll 1A and the slab dummy bar 8 are in a state where they are in only point contact. Therefore, when the slab dummy bar 8 is pulled out in the direction of arrow A, both side edges 8C of the slab dummy bar 8 are pulled out.
is pressed by the drive roll 1A, but since the pressing forces cancel each other out, the slab dummy bar 8 is pulled out straight in the direction of arrow A, and no problem occurs. However, problems arise in the case of continuous twin bloom casting. That is, the two rod-like bodies 10 constituting the twin dummy bar 9 are connected only at the tail portion 10A by the connecting rod 11.
There is a certain space between the two rod-shaped bodies 10, and since both rod-like bodies 10 are heavy and their main bodies are composed of many links and can be bent, the second
As shown in FIG. b, when the twin dummy bar 9 is held by the drive roll 1A and pulled out in the direction of arrow A, the distance from the contact point between the outer side edge 10C of both rod-shaped bodies 10 and the drive roll 1A to the center line passing through the center of gravity G A moment M, which is 1 multiplied by the weight W, is generated, and both rod-like bodies 10 are bent into a "C" shape (inwardly toward each other) using the contact point as a fulcrum. Once both rod-shaped bodies 10 are bent in this way, they cannot return to their original straight state because of their large weight. If the twin dummy bar 9 is pulled out in the direction of arrow A in this state, the movement of the head portion 10B will be as shown from A to O in Fig. 3.
The head portion 10B is pressed against the inner surface of the central mold short piece 6A with a strong pressing force. Therefore, in order to protect the inner surface of the central mold short piece 6A, a protective plate 12 made of synthetic resin or the like is normally provided on the inner surface of the central mold short piece 6A, but in the state shown in FIG. Even if the protective plate 12 is strongly pressed against the inner surface by the head portion 10B, it will not come off easily, and the protective plate 12 cannot be easily removed by using pearls or the like. In reality, the protective plate 12 is removed by pushing it away from the protective plate 12, and this operation is extremely time-consuming. Furthermore, even if continuous casting is started after removing the protective plate 12, since the head portion 10B itself is tilted, the side guide rolls 13 and 14, which are located below the central mold short piece 6A, are The vibration may cause a breakout. Therefore, it is necessary to significantly reduce the drawing speed of the twin dummy bar 9 and carefully draw it out, which is one of the causes of reduced productivity.

Therefore, the present invention provides a twin dummy bar for continuous casting equipment that solves this problem.The feature of this invention is that a cast member is placed on the inner or outer side of the rod-shaped bodies constituting the twin dummy bar in the vicinity of the head part. A guide plate is provided that comes into contact with a side guide roll disposed along one conveyance path, and the side surface of the guide plate and the inner or outer side surface of the head section are configured to be substantially flush with each other, and the outer edges of both rod-shaped bodies are The thickness of the end portion is made thinner than the thickness of the inner edge portion from the bottom of the head neck to the drive roll, and with this configuration, even if the twin dummy bar is held between the drive rolls and pulled out, Both rod-shaped bodies do not form a "V" shape and can be pulled out straight.

Hereinafter, a first embodiment of the present invention will be described based on FIGS. 4 to 8. That is, 15 and 16 are linear bodies constituting the main body portions of both rod-shaped bodies 10,
A large number of links 17 are linearly connected via pins, and among the links 17 on the inner side surface of the inner linear body 16, a plurality of links (four in this embodiment) near the head 10B are connected. Side guide roll 1 arranged on the side along the slab conveyance path
The guide plates 18 that come into contact with the guide plates 3 and 14 are fixed with bolts 19, and the side surfaces 18 of each guide plate 18 are fixed with bolts 19.
A is configured to be substantially flush with the inner side surface 20 of the head portion 10B. At this time, instead of making it almost flush with the head portion 10B, the width of the head portion is slightly narrower than the inner width of the mold because there is normally a gap, so the side surface 18A of the guide plate 18 is aligned with the inner width of the mold. In some cases, it may be configured to protrude somewhat to match the size. Further, both end portions of the side surface 18A of each guide plate 18 are inclined surfaces 18.
It is configured in B. 21 is a spacing pin. Furthermore, as shown by diagonal lines in FIG. 4, a tapered surface 22 is formed at the center portion of the front edge side surface and the rear edge side surface of the outer linear body 15. Note that the angle of inclination of this tapered surface 22 is so small that it is invisible to the naked eye.

In the above configuration, the twin dummy bar 9 is inserted into the mold 6 from above, and the lower part of the twin dummy bar 9 is clamped by the drive roll 1A. In this state, each guide plate 18 comes into contact with the side guide rolls 13 and 14. ing.
Therefore, when the drive roll 1A is rotated from this state and the twin dummy bar 9 is pulled out in the direction of the arrow A, a moment M is generated in both rod-like bodies 10 and they try to fold inward, but each guide plate 18 Since both rod-shaped bodies 10 are in contact with the guide rolls 13 and 14, they do not curve into a "V" shape. Next, when the head portion 10B leaves the support roll device 7, the drive roll 1A
is in line contact with the tapered surface 22, and the inner linear body 1
Since the side edges of the rods 10 are also in point contact with the drive roll 1A, in this state, even if the drive roll 1A is rotated and the twin dummy bar 9 is pulled out in the direction of arrow A, the moment M is not generated in both rod-like bodies 10 and the center The two rod-like bodies 10 are not bent down toward the direction O, but are pulled out in the direction of arrow A while remaining inserted into the mold 6 from above the dummy bar cover, that is, in a straight line state. Therefore, the head portion 10B is not tilted and is not pressed against the inner surface of the central mold short piece 6A with a strong pressing force.

In the above embodiment, the tapered surface 22 is formed on both the leading edge side surface and the trailing edge side surface of the outer linear body 15, but it is sufficient to form the tapered surface 22 on at least one of them.

A second embodiment of the present invention will be described based on FIGS. 9 to 14. That is, as shown by diagonal lines in FIG. 9, tapered surfaces 25 are formed on the front and rear surfaces of the outer linear body 15 near the tail portion 10A and on the outer half of the front and rear surfaces of the tail portion 10A. has been formed. Note that the inclination angle of this tapered surface 25 is so small that it is invisible to the naked eye. Reference numeral 26 denotes a guide plate bolted to the side surface of a plurality (four in this embodiment) of the links 17 on the outer side surface of the outer linear body 16 near the head portion 10B. A side surface 26A of the guide plate 26 is configured to be substantially flush with an outer side surface 28 of the head portion 10B. At this time, instead of being flush with the head portion 10B, the width of the head portion is slightly narrower than the inner width of the mold because there would normally be a gap.
The side surface 26A of the guide plate 26 may be configured to protrude rather than conform to the inner width of the mold. Further, both ends of the side surface 26A of each of the guide plates 26 are formed into inclined surfaces 26B.

According to this configuration, as shown in an exaggerated manner in FIG. 13, the twin dummy bar 9 is
When the lower part of the drive roll 1A is clamped, the tapered surface 25 comes into line contact with the drive roll 1A, and the side edge of the inner linear body 16 also comes into point contact with the drive roll 1A.In this state, the drive roll 1A is rotated. Even if the twin dummy bar 9 is pulled out in the direction of the arrow A, the mold M described above does not occur on both rod-shaped bodies 10, and the two rod-shaped bodies remain inserted into the mold 6 from above the dummy bar, that is, remain in a straight state. It is pulled out in the direction of arrow A. Therefore, the head portion 10B does not tilt, and the central mold short piece 6A
It will not be pressed against the inner surface of the body with a strong pressing force.

However, as shown in FIG. 14, if by any chance the tapered surface 25 and the drive roll 1A do not come into line contact due to the above adjustment, the drive roll 1A will move inside the inner linear body 16. It comes into contact with the side edge 16A of. Then side edge 1
A moment M' is generated, which is the distance l' from the contact point between the drive roll 6A and the drive roll 1A to the center of each rod-like body 10 passing through the center of gravity G multiplied by the weight W, and both rod-like bodies 10 are rotated in an inverted "ha" position using the contact point as a fulcrum. ” shape. However, since each guide plate 26 is in contact with the side guide rolls 13 and 14, both rod-like bodies 10 are not bent into an inverted "C" shape. Therefore, in this case as well, the head portion 10B does not tilt.

In the above embodiment, the tapered surface 25 is partially formed, but in addition to this, the entire length of the leading edge side surface and the trailing edge side surface of the outer linear body 15 and the outer side of the leading edge side surface and the trailing edge side surface of the tail portion 10A. The tapered surface 25 may be formed on both halves. Further, although the tapered surface 25 is formed on both the leading edge side surface and the trailing edge side surface of the outer linear body 15, it is sufficient to form the tapered surface 25 on at least one of them.

In FIG. 8, FIG. 13, and FIG. 14, the amount of deflection of the drive roll 1A is exaggerated; in reality, the amount of deflection is about 0.1 mm, so the tapered surface 22,
Even if a plane without an inclination is used instead of 25, the drive roll 1A and the outer linear body 15 are in sufficient line contact,
There is no risk that both rod-shaped bodies 10 will take the shape of a "V" or an inverted "V".

As described above, according to the twin dummy bar in the continuous casting equipment of the present invention, the side guide rolls are disposed along the slab conveyance path on the inner or outer side surfaces near the head of both rod-shaped bodies constituting the twin dummy bar. A guide plate is provided in contact with the guide plate, and the side surface of the guide plate is substantially flush with the inner or outer side surface of the head, and the thickness of the outer edge of both rod-like bodies is set to the range extending from the bottom of the neck of the head to the drive roll. Since the thickness of the twin dummy bar is made thinner than the inner edge, when the twin dummy bar is inserted into the mold from above and held between the drive rolls, the guide plate is in contact with the foot roll and the side guide roll of the support roll device. It is becoming. Therefore, when the drive roll is rotated and the twin dummy bar is pulled out from this state, both rod-like bodies try to fall down toward the center of the dummy bar due to the rotational moment, but the guide plate is in contact with the side guide roll. Therefore,
Both rod-shaped bodies do not curve into a "V" shape.
In addition, on the contrary, both rod-shaped bodies do not curve into an inverted "C" shape. Next, when the head part comes out of the support roll device, it is no longer supported by the side plate, but at this time, the drive roll and the slightly thin-walled part of the twin dummy bar are in line contact, and the drive roll is rotated and the twin dummy bar is rotated. Even when the rods are pulled out, no rotational moment is generated in the rods, so they do not fall inward or outward, and the rods remain inserted in the mold, that is, in a straight line. be. Therefore, there is no possibility that the head portion of the twin dummy bar is tilted and pressed against the inner surface of the central mold short piece with a strong pressing force. Further, the twin dummy bar can be pulled out at high speed without causing breakout, and productivity can be improved.

[Brief explanation of the drawing]

Fig. 1a is a schematic front view of the slab dummy bar inserted, Fig. 1b is a - arrow view of Fig. 1a, Fig. 2a is a schematic front view of the twin dummy bar inserted, and Fig. 2b is Fig. 2a. FIG. 3 is a schematic vertical sectional view showing the movement of the head portion of a general twin dummy bar. Figures 4 to 8 show the first embodiment of the present invention, with Figure 4 being a front view, Figure 5 being a view taken along the - arrow in Figure 4, and Figure 6 being a partially cutaway front view of the main part. figure,
FIG. 7 is a view taken along the - arrow in FIG. 6, and FIG. 8 is a view taken along the - arrow in FIG. Figures 9 to 14 show a second embodiment of the present invention, with Figure 9 being a front view and Figure 14 being a front view;
Figure 0 is a partially cutaway side view, Figure 11 is a partially cutaway front view of the guide plate, and Figure 12 is a partially cutaway side view of the guide plate.
13 is a cross-sectional view of the twin dummy bar in a normal state, and FIG. 14 is a cross-sectional view of the twin dummy bar in a maladjusted state. 1... Guide roll group, 1A... Drive roll,
9... Twin dummy bar, 10... Rod-shaped body, 10A
...Tail part, 10B...Head part, 11...Connecting rod, 15, 16... Linear body, 17... Link,
18, 26...Guide plate, 18A, 26A
... Side surface of the guide plate, 20 ... Head part 1
Inner side surface of 0B, 22, 25...Tapered surface, 2
8...Outer side surface of the head portion 10B.

Claims (1)

[Scope of utility model registration request] A guide plate that comes into contact with a side guide roll arranged along the slab conveyance path is provided on the inner or outer side surface near the head of both rod-like bodies constituting the twin dummy bar, and the side surface of the guide plate and the inner side of the head are provided. Alternatively, the outer side surfaces of the two rod-shaped bodies are configured to be substantially flush with each other, and the thickness of the outer edge portions of both rod-shaped bodies is made thinner than the thickness of the inner edge portions over the range from below the head neck to the drive roll. Features twin dummy bars in continuous casting equipment.