JPH0330459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a dam block feeding device for producing slabs using a twin belt caster.

Conventional technology The twin belt caster is as shown in Fig. 3.
It is composed of a pair of upper and lower endless belts 1 and 2 driven by a belt pulley 3, and a pair of left and right dam blocks 4 that are driven between the two belts. The slab 7 is continuously manufactured by supplying molten metal.

The dam block in this twin belt caster has the function of regulating the slab thickness.
Its structure consists of a large number of small blocks 8 connected endlessly by hoops 9, and is placed on the lower belt 2 and moves as the belt is driven.

In this dam block, a gap of 0.5 to 2/1000 is provided in advance between the small blocks 8 as an expansion allowance, considering that the block will thermally expand when molten metal is poured into the caster.
During casting, the temperature of the block increases and expands, thereby eliminating the gap.

However, until the temperature of the small blocks rises completely, the above-mentioned expansion margin becomes a gap between the small blocks, and gaps are created at one to several locations.

For this reason, when molten metal is supplied to the caster, the molten metal is inserted between the holes, solidified and becomes a base metal, and on the outlet side of the caster, the cast slab is pulled out by pinch rolls and the bottom The dam blocks 4 that are moving are pulled together,
The solidified shell may split, causing a breakout, or the hoop 9, which passes through the center of the small blocks 8 and connects each small block, may be cut or bent.

To prevent this, from the time hot water starts being supplied to the caster until the temperature of the dam block has risen completely, the small blocks are manually pushed in the direction of movement of the dam block so as to eliminate the gap between the small blocks on the inlet side of the caster. Alternatively, a total gap is created on the lower surface of the tension roll on the exit side of the caster, and the gap is created by the head difference, but in any case, these methods are not safe and reliable and have problems.

Therefore, for example, a belt type, a fixed dam, etc. have been proposed. However, the belt type has not yet been put into practical use because of thermal distortion of the belt, which prevents sufficient sealing at the contact areas between the upper and lower belts and the dam block, and molten metal may be inserted between the contact areas.

In addition, the fixed dam method has the characteristics that the hot water flows well in the molten metal supply zone, and the fixed dam that forms the short side wall of the mold and the slab are smoothly separated, but the thermal deformation of the fixed dam There are problems such as an increase in the pulling force of the slab due to sliding friction resistance between the slab and the fixed dam, and damage to the surface of the slab due to seizure at the contact area between the fixed dam and the molten metal.

In order to solve these problems, a fixed dam has been proposed that covers the inner wall surface of the short side dam block in the vicinity of the molten metal supply part of the mold and the solidification start part of the slab (in practice). Showa 58-102244
issue).

However, with this fixed dam, the thin part of the dam deforms and seizes, or the initially solidified shell on the short side expands in the casting direction along the fixed dam, and the short side becomes bulged. There is a problem that the quality of the slab becomes unstable.

Problems to be Solved by the Invention This invention solves the above-mentioned conventional problems and aims to improve the stable operation of a twin belt caster and the quality of slabs by automatically feeding small blocks constituting a dam block in sequence. Accordingly, the present invention proposes a dam block feeding device which prevents molten metal from being inserted into the space between the blocks.

Means for Solving the Problems This invention is designed to eliminate gaps between small blocks by feeding small blocks one after another by frictional resistance with motor-driven rolls. A spring device in which a feed roller consisting of an inner ring and an outer ring is attached to the tip of a rotating shaft driven by a motor, which is arranged perpendicularly to the dam block on the inlet side of the dam block, and the outer ring is radially interposed between the outer ring and the inner ring. The structure is such that it is elastically supported by the dam block and rotated in contact with the dam block.

Function The feed roller consists of an inner ring and an outer ring.The inner ring is attached to a rotating shaft driven by a motor, and the outer ring rotates together with the inner ring via a spring device installed radially between the inner ring and outer ring. By rotating the feed roller at a circumferential speed slightly faster than the moving speed of the dam block, the small block can be moved downstream, and the outer ring in contact with the dam block can be moved downstream. Since the inner ring is elastically supported by a spring device, the small blocks are fed smoothly and effectively due to the buffering effect of the spring, and the gaps between the small blocks are eliminated by moving them downstream. to prevent molten metal from being inserted into the

Embodiment FIGS. 1 and 2 illustrate a dam block feeding device according to the present invention. FIG. 1 is a perspective view showing the overall structure of the feeding device, and FIG. 2 is a diagram showing the feeding roller of the same device. FIG. 2 is a partially cutaway front view showing a portion enlarged.

That is, in the dam block feeding device according to the present invention, a pedestal 11 is provided on an arm 10 installed on the inlet side of a twin belt caster, and a drive device (motor) 12 and a bearing are mounted on this pedestal 10 in a direction perpendicular to the dam block 4. 14, and a power transmission shaft 16 supported by a bearing 14 on the drive shaft 15 of the drive device.
are connected by a coupling ring 13, and a feed roller 5 consisting of an outer ring 17, an inner ring 19, and a spring device 18 is attached to the tip of a power transmission shaft 16.

As shown in an enlarged view in FIG. 2, the feeding roller 5 includes, for example, four sets of springs disposed on the circumference between the outer peripheral surface of the inner ring 19 fixed to the power transmission shaft 16 and the inner peripheral surface of the outer ring 17. The spring device 18 includes a spring guide 21 fixed to the outer peripheral surface of the inner ring 19, a spring 22 fitted into this guide, and a spring 2.
2 and a movable pin 23 with a spring seat 24 disposed between the outer ring 17 and the inner peripheral surface of the outer ring 17. The outer ring 17 is elastically supported by the inner ring 19 by the action of the spring 22.

As shown in Fig. 3, the dam block feeding device is preferably installed at a position slightly upstream of the pouring part on the inlet side of the caster, and the feeding roller is not only installed above the dam block 4 but also below it. It is also possible to provide a pair of upper and lower feed rollers 4, 4-1 together, which is more effective.

The feed roller may be made of rubber tires with excellent heat resistance, but in this case it is necessary to cool it sufficiently with water or the like.

In the above device, when the feed roller 4 is rotated in the direction of the arrow in FIG. The small block is brought into rotational contact with and moved to the downstream side. This eliminates gaps between the small blocks in the pouring section, and prevents molten metal from being inserted into these gaps.

Effects of the Invention As explained above, according to the present invention, each small block of the dam block can be cast while being automatically fed, so molten metal can no longer be inserted between the small blocks as in the past. It is possible to prevent breakouts and dam block hoop breakage accidents that tend to occur when the dam block and slab are separated at the mold exit due to insertion of molten metal. In addition to improving quality, it is also extremely effective from a safety perspective.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a dam block feeding device according to the present invention, Fig. 2 is a partially cutaway front view showing an enlarged portion of the feeding roller in the same device, and Fig. 3 is an object of the present invention. FIG. 2 is a schematic diagram showing a twin belt caster. 4...Dam block, 5...Feed roller, 7
...Slab, 8...Small block, 9...Hoop, 1
1... Frame, 12... Drive device, 17... Outer ring,
18...Spring device, 19...Inner ring.

Claims (1)

[Claims] 1. A dam block feeding device for a twin belt caster consisting of a pair of upper and lower endless belts and a pair of left and right dam blocks driven by being sandwiched between the two belts, and a motor disposed on the inlet side of the caster in a direction perpendicular to the dam blocks. At the tip of the driven rotating shaft,
A feed roller consisting of an inner ring and an outer ring is installed, and the outer ring is elastically supported by the inner ring by a spring device interposed in the radial direction between the outer ring and the inner ring, and has a structure in which it is brought into rotational contact with a dam block. Twin belt caster dam block feeding device.