JPH0421630Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a block structure of a block type continuous casting apparatus.

[Conventional technology and its problems]

BACKGROUND OF THE INVENTION A block type continuous casting apparatus has been known, for example, as disclosed in Japanese Utility Model Publication No. 61-4442, which utilizes an endless orbital block band made up of a plurality of continuous block bodies.

Each block body _B2 in this continuous casting device is
As shown in FIG. 4, a support block 42 is provided with connecting holes 45 and 47 between adjacent block bodies at both ends of the base end in the direction of movement of the block body (horizontal direction in the drawing).
A fastening bolt 5 is attached to the tip of this support block 42.
Mold block 3 connected via 0,51
1.

In this structure, the support block 42 is made of steel, while the mold block 41 is made of copper plate, which has a higher coefficient of thermal expansion than steel, and both ends of the mold block 41 are fastened to the same support block 42. Therefore, during continuous casting, the mold block 41 thermally expands more than the support block 42 due to the heat received from the molten steel, and the mold block 41 deforms into an arc shape as shown by the broken line in FIG. The length of the surface of the mold block 41 that comes into contact with the slab becomes longer than the distance between the centers of the connection holes 45 and 47 by the amount of the distortions δ ₃ and δ ₄ .

FIG. 5 is a side view of a main part illustrating the concept of a block band formed by connecting a plurality of block bodies of a continuous casting device. As shown in FIG. 5, a plurality of adjacent blocks are connected to each other to form an endless orbital block band, and the block band is rotated by a driving wheel and a driven wheel (not shown). A block-type continuous casting apparatus is constructed in such a way that it is possible to do so. During casting, continuous casting of slabs is carried out using a mold formed by the mold blocks of each block body on the linear track section while rotating the endless track-shaped block band through each of the above-mentioned wheels. .

Note that the lower block band in FIG. 5 shows one formed by connecting the above-mentioned conventional block bodies _B2 .

In the conventional block body _B2 , as shown in the partial cross section of the lower block band in FIG. 5, the mold block 41 is deformed into an arc shape in the straight track portion during continuous casting, so that the surface side that contacts the slab is deformed into an arc shape. If the length becomes larger than the distance between the centers of the connecting holes 45 and 47, the mold block 41 of the adjacent block body _B2 will collide locally by the strain δ ₃ and δ ₄ , resulting in damage. For this reason, when connecting the block bodies B ₂ , it is necessary to take the above distortion amount into account and form a gap between the adjacent block bodies B ₂ , but if the gap is too large, it may cause problems at the molten steel injection part. If the molten steel enters the gap and the gap is too small, there is a risk that the mold block 41 etc. will be cracked or crushed in the rear half of the mold, making it extremely difficult to set the gap. There were problems such as deterioration of the surface quality of the Bi slab due to arc-shaped thermal deformation.

The inventor of the present invention has continued to conduct intensive studies to solve the above-mentioned conventional problems, and prior to filing the present application, he proposed a block body structure (Utility Application No. 1982-79409) to solve the above-mentioned problems. It's on.

As shown in FIG. 3, each block body B ₁ in this proposal has a pair of support blocks 2 arranged at a predetermined interval s in its moving direction (horizontal direction in the drawing).
Both ends of the mold block 21 are connected to the tips of the mold blocks 2 and 23 with fastening bolts 30 and 31 to form a gate shape, and the base ends of both support blocks 22 and 23 are spaced apart from each other via the sliding shaft 24. Connected so that they can be changed.

Further, the sliding shaft 24 is disposed parallel to the mold block 21, and one end thereof is connected to one of the supporting blocks 21.
3, and the other end is slidably engaged with the other support block 22 via a bush 32.

And, the base end portions of both support blocks 22 and 23,
That is, connecting portions 25 and 27 between the block bodies _B1 are provided on the outside of the lower part of the figure, respectively.

In the block body _B1 having this configuration, when the mold block 21 thermally expands, both support blocks 22,
23 are guided by the sliding shaft 24 while remaining parallel to each other and facing each other, the distance s is enlarged in accordance with the thermal expansion, and the mold block 21 is constrained by the deformation of the block body B ₁ in the moving direction. In addition, the amount of change in the distance between the connecting centers of the connecting portions 25 and 27 at the proximal ends of the supporting blocks 22 and 23 is equal to the amount of thermal expansion δ ₀ of the molded block 21. We will deal with it.

Therefore, this block body _B1 has a thermal expansion amount of the mold block 21 during continuous casting.
As shown by the two-dot chain line at the rear end of the block band shown in the upper part of the figure, the block band is absorbed by the parallel elongation, which causes the problem in the prior art described above. This provides the effect of reliably preventing arc-shaped thermal deformation.

However, for block body _B1 with this configuration,
A more detailed study revealed that during continuous casting, when the mold block 21 thermally expands due to the heat received from molten steel, the amount of expansion is the same on the side that contacts the slab and on the sides of both support blocks 22 and 23. A difference occurs, that is, the side that contacts the slab that directly receives the heat of molten steel expands significantly compared to the sides of both support blocks 22 and 23, which are relatively low temperature, and this mold block 21 expands to the extent shown in FIG. It is deformed into an inverted trapezoidal shape as shown by the broken line, and the average thermal expansion amount δ ₀ is the same as that of both supporting blocks 2 as shown by the dashed line in FIG.
Although this is absorbed by changing the follow-up enlargement of the interval s in steps 2 and 23, the length of the surface of the mold block 21 that comes into contact with the slab is reduced by the amount of deformation difference δ ₁ and δ ₂ between the two sides. It is larger than the distance between the connecting centers of 28 and 29.

Therefore, during continuous casting, this block body B ₁ is locally collided with and damaged by the amount of deformation difference δ ₁ and δ ₂ between the side edges of the mold block 21 that come into contact with the slab of the mold block 21 at the straight track portion. For this reason, it is necessary to create a gap between adjacent block bodies in consideration of the above deformation difference δ ₁ and δ ₂ when connecting the block bodies, which is similar to the conventional technique described above. It turned out that the problem remained.

The present invention was made to solve these problems, and it is possible to easily make the entire block body follow thermal expansion, and prevent the mold block from deforming into an arcuate shape. Moreover, the distance between adjacent block bodies can be easily changed to accommodate uneven thermal expansion on the side of the mold surface that comes into contact with the slab, and the distance between the mold blocks of adjacent block bodies can be easily changed by local collision between the mold blocks of adjacent block bodies. The object of this invention is to prevent damage and improve the surface quality of the slab, as well as to prevent the occurrence of cracks and crushing of the mold block of the block body, thereby increasing the life of the mold block.

[Means for solving problems]

In order to achieve the above object, the present invention has the following configuration. That is, the block structure of the block type continuous casting apparatus according to the present invention is such that in the block type continuous casting apparatus equipped with a block band formed by connecting a plurality of block bodies in an endless track, each of the block bodies is Both ends of the molded block are connected to the tips of a pair of support blocks arranged at a predetermined interval in the direction to form a gate shape, and the base ends of both support blocks are connected to a sliding axis parallel to the molded blocks. The supporting blocks are connected to each other so that the distance between them can be changed, and a connecting jig for connecting adjacent blocks is attached to the base ends of both support blocks via an elastic member so as to be able to expand and contract in the direction of movement of the blocks. That is.

[Effect]

In the present invention having the above configuration, when the mold block thermally expands, the sliding shaft guides the two supporting blocks to change the spacing in accordance with the thermal expansion while remaining parallel to each other, thereby connecting the two supporting blocks. The amount of change in the interval between the parts corresponds to the amount of thermal expansion of the mold block, and the mold block thermally expands linearly in the direction of movement of the block body.
This prevents the mold block from curving into an arc.

In addition, if the mold block thermally expands unevenly on the side that contacts the slab due to a temperature difference between the side that contacts the slab and the other side, the unevenly expanded portions of the mold blocks of adjacent block bodies may The connecting jigs for adjacent block bodies are attached to the proximal ends of both support blocks via elastic members so as to be able to expand and contract in the direction of movement of the block bodies. The elastic member between the connecting part and the support block is elastically deformed by this pressing force, and the distance between the connection center of the connecting part and the support block, that is, the distance between adjacent block bodies, is on the side of the surface that comes into contact with the slab. The amount of expansion is changed in accordance with the uneven expansion amount, and the force applied to the abutting portions of the uneven expansion portions of the mold block is reduced, thereby preventing the occurrence of cracks or crushing at that portion.

[Example] An example of the present invention will be described with reference to FIGS. 1 and 2.

This block body B ₀ is constructed by connecting both ends of the mold block 1 with fastening bolts 10 and 11 to the tips of a pair of support blocks 2 and 3 that are arranged at a predetermined interval s in the direction of movement (horizontal direction in the drawing). The base end portions of both support blocks 2 and 3 are connected to each other via a sliding shaft 4 so that the distance between them can be changed.

Further, the sliding shaft 4 is disposed parallel to the mold block 1, and one end thereof is fixed to one support block 3, and the other end is slidably engaged with the other support block 2 via a bush 12. ing.

Connecting jigs 5 and 7 for connecting adjacent block bodies to the outside of the lower ends of both support blocks 1 and 2 are respectively attached so as to be extendable and retractable in the moving direction of the block bodies.

This connection jig 5 is disposed parallel to the mold block 1, is slidably held by the support block 2 via a bush 13, and has a disc spring 14 disposed at the end opposite to the connection side, and It is connected to the support block 2 via a nut 15 which holds 14. Further, the connecting jig 7 is connected to the support block 3 with the same structure as the connecting jig 5, but facing in the opposite direction.

Note that connection holes 6 and 8 are provided in both connection jigs 5 and 7 of each block body _B0 , and the distance between the centers of the connection holes 6 and 8 during assembly is determined by the distance in the direction of movement of mold block 1. A distance equal to the length is set as the reference value.

A plurality of block bodies B ₀ configured in this way
As shown in FIG. 6, adjacent blocks are connected to each other to form an endless track-like block band, and the block band can be rotated by a driving wheel and a driven wheel. This constitutes a block type continuous casting device. During casting, the endless track-shaped block band is rotated through each wheel, and the mold block ₃ of each block body B0 is
Continuous casting of slabs is carried out using the mold formed by.

During continuous casting, when mold block 1 is thermally expanded by molten steel, both support blocks 2 and 3 are displaced in a direction that increases the distance s between them, as shown by the dashed line in FIG. At this time, since the base ends of both support blocks 2 and 3 are independent from each other and are connected to each other via the sliding shaft 4 so that the distance between them can be changed, both support blocks 1 and 2 remain parallel to each other. The interval s is changed.

Along with this, the connecting jigs 5 and 7 provided at the base ends of both support blocks 2 and 3 are moved in parallel, and the distance between them is expanded in accordance with the amount of thermal expansion δ ₀ of the molded block 1. As a result, the mold block 1 is no longer curved into an arc like in the past.
Since the surface that contacts the slab remains flat and thermally expands linearly in the moving direction of the block, there is no risk that the surface quality of the slab will be degraded.

Furthermore, when the mold block 1 thermally expands due to the heat received from the molten steel, there is a difference in the amount of expansion between the side that contacts the slab and the sides of both support blocks 2 and 3. Block 2,
Compared to the side 3, the side that contacts the slab, which directly receives the heat of the molten steel, expands significantly, and the mold block 1 has an inverted trapezoidal surface that comes into contact with the slab, as shown by the broken line in Figure 2. When the side bulges and deforms, the bulges of the mold blocks 1 of the adjacent block bodies _B0 abut and press each other, increasing the distance d between the adjacent block bodies _B0 shown in FIG. A force acts on each other, but the block bodies B0 and _B0 are
As shown in Fig. 1, since the connection is made via a connection jig that is connected to the support block through the disk spring, this force is absorbed by the elasticity of the disk spring, that is, the connection jig connects the support block to the support block B. It is absorbed by stretching in the direction of movement of ₀ .

Along with this, the distance between adjacent block bodies B ₀ is enlarged in accordance with the uneven expansion amounts δ ₁ and δ ₂ of the surface of the mold block 1 that comes into contact with the slab, and as a result, the mold block 3 The force exerted on the surface side bulge that abuts the piece is reduced. Therefore, damage to the mold block 1 at this location can be prevented. These facilitate gap management (adjustment, etc.) during the formation of block bands, prevent cracks or crushing from occurring in the mold block 1, and ensure that the corner portions of the block body _B0 are This prevents them from digging into or damaging the surface.

[Effect of idea]

As described above, the present invention allows a mold block to be supported by a pair of support blocks, and by connecting the base ends of both support blocks via a sliding shaft, both supports can move in parallel when the mold block thermally expands. The distance between adjacent mold block bodies can be automatically changed by connecting the connecting jig with the adjacent mold block bodies to the proximal ends of both support blocks via elastic members. This structure prevents the mold block from curving into an arc as in conventional mold blocks, and also prevents the surface of the slab from being damaged at the corners of each block body. Quality can be significantly improved. In addition, gap management (adjustment, etc.) when connecting each block body to form a block band becomes easy, and the life of the block body can be improved by preventing the occurrence of cracks and crushing of mold blocks, etc. It also has the effect of significantly shortening maintenance time.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an embodiment of the block body of the present invention, and FIG. 2 is a side view illustrating its state during thermal expansion. 3 and 4 are side views of a conventional block body. Fifth
The figure is a side view of a main part explaining the concept of a block band formed by connecting a plurality of block bodies of a continuous casting apparatus.

Claims (1)

[Scope of utility model registration request] In a block type continuous casting machine equipped with a block band formed by connecting a plurality of block bodies in an endless track, each of the block bodies is molded at the tip of a pair of support blocks arranged at a predetermined interval in the direction of movement of the block bodies. Both ends of the block are joined to form a gate shape, and the proximal ends of both support blocks are connected to each other via a sliding shaft parallel to the molded block so that the distance can be changed freely, and the adjacent block bodies A block structure of a block type continuous casting apparatus, characterized in that a connecting jig is attached to the base end portions of both support blocks via elastic members so as to be expandable and retractable in the direction of movement of the block body.