JPH07102431B2 - Short side weir in twin roll type continuous casting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a short side weir in a twin roll type continuous casting facility.

2. Description of the Related Art As equipment for continuously casting thin plates, there is a twin roll type equipment in which a pair of mold rolls provided in parallel with each other are used and a cast piece is pulled out from between the mold rolls. In this twin roll type continuous casting facility, as shown in FIG. 4, the short side weir 32 for forming a molten steel reservoir is formed between both mold rolls 31 in cooperation with the pair of mold rolls 31. Arranged at both ends of the roll 31, and the short side weir 32 itself is pressed toward the mold roll 31 side so that molten steel does not leak from the gap between the mold roll 31 and the short side weir 32. Was said.

However, according to the above-described conventional configuration, the inner wall of the short side weir 32 forms a wall shell and gradually grows over time and forms on the outer peripheral surface of the mold roll 31. There is a problem in that the slab shell is restrained, which deteriorates the formation state of the slab shell and causes breakout.

Therefore, an object of the present invention is to provide a short side weir in a twin roll type continuous casting facility that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the short side weir in the twin roll type continuous casting equipment of the present invention is provided at both ends of a pair of mold rolls provided in parallel with each other and cooperates with these mold rolls. Weir bodies that work to form a molten steel reservoir are arranged respectively, and an annular sliding member is provided between the weir body and the sliding end face portion of each mold roll and the same axis as that of the mold roll. In addition to being able to rotate around the center,
A rotary drive device for rotating this sliding member at a slower speed than the mold roll is provided.

Operation According to the above configuration, since the annular member arranged between the weir main body and the mold roll is rotated at a speed lower than the rotation speed of the mold roll, a cast piece shell formed on the surface of the mold roll is used. It is possible to prevent the connection portion with the wall shell formed on the surface of the weir main body from being divided, and thus preventing the cast piece shell on the mold roll side from being restrained by the wall shell on the weir main body side.

Embodiment One embodiment of the present invention will be described below with reference to FIGS.

In FIGS. 1 and 2, 1 is arranged at both ends of a pair of mold rolls 2 provided in parallel with each other so as to form a molten steel reservoir above the mold rolls 2 in cooperation with the mold rolls 2. It is the weir body. A sliding member 3 made of a refractory material having a thermal conductivity lower than that of the mold roll 2 itself is provided between the weir main body 1 and the sliding end surface portion 2a of the mold roll 2. It is rotatably supported by the rotating shaft body 4 and is rotated at a speed slower than the rotation speed of the mold roll 2 by the rotation driving device 5 utilizing the rotation driving force of the mold roll 2. That is, an annular internal gear 6 having an annular tooth portion 6a formed on the outer periphery is externally fitted and fixed to the end of the rotary shaft body 4 of the mold roll 2, and the annular internal gear 6 is moved toward the side surface of the mold roll 2 At the position, a disc body 7 is guided and supported rotatably around the axis of the rotary shaft body 4 via a guide protrusion 8 formed on the outer peripheral surface of the annular internal gear 6.
An annular groove 9 that is engaged and guided by the guide projection 7 is formed on the inner peripheral surface of the disc body 7. The sliding member 3 is fixed to the outer peripheral portion of the disc body 7 with bolts 10. The sliding member 3 is divided into a plurality of parts along the circumference, and the outer peripheral surface on the molten steel reservoir side is arranged so as to be flush with the outer peripheral surface of the mold roll 2. Then, in the housing 12 for the bearing 11 of the rotary shaft body 4,
An annular tooth portion 13 is formed on the inner peripheral surface at a position corresponding to the annular internal gear 6.
An annular external gear 13 having a formed therein is fixedly provided by a bolt 14. Further, for example, four planetary gears 15 are rotatably attached to the inner peripheral boss portion 3a of the sliding member 3 at intervals of 90 degrees via bearings 16, and the planetary gears 16 are annular outer gears 13 respectively. And both annular tooth portions 13a, 6a of the annular internal gear 6
It is supposed to mesh with. In addition, 17 is a bush.

Therefore, the mold roll 2, that is, the rotating shaft body 4,
For example, when rotating in the direction of arrow a in FIG. 2, the planetary gear 15 meshes with the annular tooth portion 13a of the stationary external ring gear 13, so it is in the same direction as the rotating shaft body 4 and slower than the rotating shaft body 4. It revolves around the rotating shaft body 4 at a rotation speed (for example, about half the rotation speed). That is, the sliding member 3 rotates at a rotation speed lower than the rotation speed of the mold roll 2.

Thus, when the sliding member 3 rotates at a slower speed than the mold roll 2, as shown in FIG. 3, the slab shell A formed on the surface of the mold roll 2 and the surface of the weir body 1 are formed. And the wall shell B which is formed on the surface of the mold roll 2 are separated by the wall shell B on the weir body 1 side. Is prevented. Since the sliding member 3 rotates in the same direction as the mold roll 2, the cast shell A on the mold roll 2 side is not scratched. Furthermore, since the relative speed between the weir body 1 and the sliding member 3 is about half the rotation speed of the mold roll 2, the amount of wear due to the sliding on the weir body 1 side is halved, and the life is doubled. Moreover, the temperature of the slab shell C formed on the surface of the sliding member 3 made of refractory is high and not so strong, so that the life of the weir body 1 is further extended.

The outer peripheral surface of the sliding member 3 is provided with an uneven surface so that the cast shell C can be easily attached, and the thickness (width) of the sliding member 3 may be sufficient if strength can be maintained, for example, about 20 mm. It The material of the sliding member 3 may be metal, for example. However, even in this case, the mold roll 2
Nimori with a low thermal conductivity is used.

By the way, in the above embodiment, the rotational driving force of the sliding member 3 is taken out from the rotary shaft body 4 of the mold roll 2 via the planetary gear 15, but it is not always necessary to take it out from the mold roll 2 side, for example. Sliding member 3 separately
The rotation driving device may be provided.

As described above, according to the configuration of the present invention, the sliding member arranged between the weir body and the mold roll is rotated at a speed lower than the rotation speed of the mold roll. Since the connection point between the slab shell formed on the surface of the roll and the wall shell formed on the surface of the weir body is divided, the slab shell on the mold roll side is restrained by the wall shell on the weir body side. Can be prevented, so that the slab shell can be formed in a good condition and the slab or product quality is not adversely affected.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
FIG. 2 is a sectional view of a main part, FIG. 2 is a sectional view taken along the line II of FIG.
The figure is a cross-sectional view of an essential part for explaining a formation state of a slab,
FIG. 1 is a side view showing the overall schematic configuration of a conventional example. DESCRIPTION OF SYMBOLS 1 ... Weir body, 2 ... Mold roll, 2a ... Sliding end face part, 4 ... Rotating shaft body, 5 ... Rotation drive device, 6 ... Annular internal gear, 7 ... Disc body, 13 ... … Ring external gear, 15… Planetary gear.

Claims (1)

[Claims] 1. A weir body is provided at both ends of a pair of mold rolls provided in parallel with each other to form a molten steel reservoir above the mold rolls in cooperation with the mold rolls.
Further, an annular sliding member is rotatably provided around the same axis as the mold roll, between the weir main body and the sliding end surface portion of each mold roll, and the sliding member is more than the mold roll. A short-side weir in a twin-roll type continuous casting facility, which is provided with a rotary drive device that rotates at a slow speed.