JPH0344365Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to a transfer device located under a slab cutting torch for continuous casting maintenance, and more specifically, to avoid adhesion of slab cutting slag while casting. The present invention relates to a transfer device equipped with a transfer roll improved to prevent the occurrence of indentation scratches on pieces.

<Prior art> In continuous casting equipment, a slab pulled from a mold is guided to a horizontal state, and then a gas cutting torch facing above cuts the slab into required lengths to produce slabs of a fixed length. obtain.

By the way, the transfer roll located directly below the cutting torch (hereinafter referred to as the lower torch roll) is temporarily retracted downward to protect it from the flame of the torch when cutting the slab, and then raised again after waiting for the torch to pass. I do. Such an operation cannot avoid splash (slag) that accompanies cutting, and there is therefore a concern that slag may adhere to the roll under the torch. The adhered slag is pushed into the lower surface of the slab when the roll returns and rises, causing so-called indentation flaws, which can significantly impair the quality of the slab.

<Problem to be solved by the invention> As a countermeasure against slag adhesion, conventional methods include coating the roll surface with various metals with low slag adhesion by thermal spraying, weld overlay, plating, etc. A method of spraying water or the like to cool the slag and peel it off is practiced. However, in the former case, although good results can be obtained immediately after treatment regardless of the treatment method, the effect is often lost relatively early after treatment. In other words, when cutting a slab, the raising and lowering of the torch lower roll and the movement of the cutting torch often cause a lag in the timing of their operation due to operational errors in their operating systems, especially in the mechanical parts. In such cases, the roll surface cannot sufficiently avoid the torch flame, resulting in localized deterioration. When such deterioration points are formed on the roll surface, slag adhesion progresses from there as a foothold, resulting in the production of large deposits. Because of this tendency, the surface treatment method described above cannot be expected to have long-term effects.

Therefore, when using this method, the reality is that frequent maintenance of the roll surface is essential if slabs of consistently stable quality are to be obtained.

Regarding the latter cooling method using spray, this is originally only an auxiliary means and cannot be a fundamental measure in terms of effectiveness.

By using ceramics, the present invention substantially eliminates slag adhesion on the roll surface and has the durability to maintain its performance over a long period of time.
To provide an under-torch transfer device capable of semi-permanently preventing the occurrence of indentation defects and obtaining high-quality slabs without maintenance.

<Means to solve the problem> Ceramics has an extremely smooth surface, so there is virtually no slag adhesion, and its wear resistance and heat resistance are comparable to metal materials such as steel. It's outstanding by comparison. The torch lower roll according to the present invention takes advantage of the inherent material properties of such ceramics, and is characterized by an arbor roll made of steel and a plurality of ring-shaped ceramic screws that are externally fitted onto the arbor roll at predetermined intervals. and means for fixing the ceramic skid to the arbor roll in both the axial and circumferential directions.

That is, the under-torch transfer device of the present invention includes an arbor roll 1 that is an elevating roll made of steel and has a protrusion 1b at one end of its body 1a, and a protrusion 1b of the arbor roll 1 that is attached to one end stop. The body portion 1a is spaced apart from each other by a predetermined distance S in the axial direction.
At the same time, when the arbor roll 1 is used, the arbor roll 1 is tightly fitted into the body part 1a in a thermally expanded state. Inner surface 2
A plurality of ring-shaped ceramic skids 2 provided in a, and adjacent ceramic skids 2, 2 to fix the axial position of the ceramic skids 2.
and the other end of the body 1a.
A scraper 4 is disposed below the lower roll of the gas cutting torch, which is equipped with a steel sleeve 3 fitted to the lower part of the gas cutting torch, and comes into contact with the sleeve 3 between the ceramic skids 2, 2 when the roll is retracted downward. It is characterized by the fact that it was established.

<Example> A more specific explanation will be given below with reference to the drawings.

FIGS. 1A and 1B are a side view and a front view of a lower torch roll according to an embodiment of the present invention, and FIG. 2 is a partially cutaway side view showing a portion of the same upper roll in an enlarged manner.

In the figure, 1 is an arbor roll, 2 is a ring-shaped ceramic skid, and 3 is a sleeve provided with means for fixing the ceramic skid 2 to the arbor roll 1.

In the figure, five ceramic skids 2 are provided, and these are mounted on the outer circumference of the arbor roll 1 at a predetermined distance S from each other in the axial direction. Each ceramic skid 2 has inner and outer surfaces 2a and 2b.
is flat, and as shown in FIG.
a has a recess 2c into which it fits, and the recess 2c
Key 3 on the sleeve side (described later) is placed at one location on the circumference of the sleeve.
An axial keyway 2d corresponding to b is formed. In this embodiment, all the ceramic skids 2 are inserted and assembled from one end of the arbor roll 1 (the right end in the figure), and only the ceramic skid 2 located at the farthest end (the left end in the figure) is The recess 2c and keyway 2d are provided only on one side, and the flat side 2e is positioned by abutting against the circumferential protrusion 1b provided at the end of the arbor roll body 1a. It's like this. The inner diameter d of the ceramic skid is set so as to provide an intermediate fit with the outer diameter D of the arbor roll body 1a, so that there is no force relationship between them under normal conditions and the ceramic skid is heated by the heat of the slab during use. The bonding force is determined to be such that bonding force only occurs due to the difference in thermal expansion coefficient between the two when This is significant in that it prevents the ceramic skid 2 from being damaged by excessive force from the inside during use, and also facilitates assembly.

Next, the sleeve 3 is a cylindrical body made of steel that can be shrink-fitted, and is fitted onto the body 1a of the arbor roll, between the parallel ceramic skids 2, and at the assembled end (left end) of the arbor roll. It is located on the outermost side of the ceramic skid. This sleeve 3 is provided with an axial key 3d on both left and right shoulders on the outer circumferential side (in the case of a sleeve between parallel skids), or on one shoulder (in the case of the leftmost sleeve), and on both sides or on one side. The ends of the ceramic skids 2 are fitted into the recesses 2c and the keys 3b are engaged with the key grooves 2d, thereby positioning all the ceramic skids 2 at predetermined axial positions and fixing them in the circumferential direction. . The inner diameter d' of each sleeve 3 is finished in an interference fit with the outer diameter D of the arbor roll 1, so that the two are strongly fitted and connected by shrink fit.

The torch lower roll as described above is attached to the ceramic skid 2 from the assembly end side with respect to the arbor roll 1.
The sleeve 3 is assembled by sequentially assembling the sleeve 3 and the sleeve 3 in a normal assembly relationship.

Note that the structure of the torch lower roll according to the present invention is not limited to the above example; for example, the structure of the torch lower roll according to the present invention is
Instead, a spline may be used instead.Furthermore, the role of the sleeve 3 is limited to positioning the ceramic skid in the axial direction, and a key or spline is provided directly on the arbor roll 1 to fix the skid in the circumferential direction. It is also possible to have it play the role of

In the torch lower roll according to the present invention configured as described above, the outer circumferential surface 2a of the ceramic skid 2 contacts the lower surface of the slab M to support and transfer it. Because the surface is extremely smooth, even if splashes are scattered during cutting of slabs, they will not peel off or fall off, leading to slag adhesion. In addition, because the ceramic skids that exist intermittently in the axial direction have a large surface area as a whole, they have extremely good cooling properties, and the temperature does not rise significantly even when they come into contact with slabs (500-600℃). , the temperature difference between the cutting spray and the cutting spray is always maintained large, which promotes the tendency of the slag to peel off and further ensures the effect of preventing slag adhesion.

Furthermore, due to its extremely high heat resistance, the ceramic skid 2 has no risk of melting and damage even if it is exposed to the flame of the torch due to an operational error between the lower torch roll and the torch. Therefore, the above performance does not deteriorate over a long period of time.

In addition to the above, the ceramic skid 2 is also outstanding in terms of wear resistance, and wear progress due to slab transfer is extremely slight. Since it is an intermediate fit to the arbor roll 1 and is tightly fitted when heated by the heat of the slab during use, there is no cracking due to thermal expansion of the arbor roll 1. Therefore, it can be used almost permanently without maintenance. In addition, a protrusion 1b is integrally provided at one end of the roll portion 1a as an end stopper.
The roll can be assembled by simply fitting ceramic skids 2 and sleeves 3 into the arbor roll 1 alternately, and the sleeve 3 fitted last becomes the other end stopper. In addition to using ceramic skid 2 as an intermediate fit, sleeve 3
Since they are made of steel that can be shrink-fitted, they can be fitted into the arbor roll 1 without resistance when assembling the rolls. Therefore, roll assembly is easy.

In the case of the roll according to the present invention, the scattered splash tends to slide off the outer peripheral surface of the ceramic skid 2 and accumulate between the skids. With this roll retracted downward, a scraper 4 is installed to scrape off the slag accumulated between the skids 2.

As a result of the above, the under-torch transfer device of the present invention semi-permanently prevents the occurrence of indentation defects on the slab surface due to slag adhesion without requiring maintenance, making it possible to continuously manufacture high-quality slabs. It is.

<Effects of the invention> As mentioned above, the under-torch transfer device of the present invention has the following effects:
In this roll, since the skid in direct contact with the slab is intermittently shaped in the axial direction and the skid is made of ceramics, there is substantially no slag adhesion on the skid surface. Furthermore, it is extremely durable in terms of erosion and abrasion, and since sufficient consideration has been taken to prevent breakage, it has excellent durability. In addition, a scraper is also provided that uses the lifting and lowering of rolls to prevent slag from adhering to the surface of the steel sleeve. Therefore, the present invention greatly contributes to improving the quality of slabs by eliminating the need for maintenance of the lower torch roll and preventing slab indentation defects. Moreover, the roll assembly is easy. In addition, the scraper structure that utilizes the lifting, lowering, and rotation of rolls has a simple structure and occupies less space.

[Brief explanation of the drawing]

1A and 1B are an overall side view and a front view of a torch lower roll according to an embodiment of the present invention; FIG. 2 is a partially cutaway side view showing an enlarged part of the torch lower roll; The figure is a side view showing the overall structure of the under-torch transfer device of the present invention. In the figure, 1: arbor roll, 2: ceramic skid, 3: sleeve, 4: scraper.

Claims (1)

[Scope of utility model registration request] It is an elevating roll made of steel, and its body 1
an arbor roll 1 provided with a protrusion 1b at one end of a;
The protrusion 1b of the arbor roll 1 is used as one end stopper and is fitted onto the body 1a at a predetermined interval S in the axial direction, and when the arbor roll 1 is used, the arbor roll 1 is thermally expanded. A plurality of ring-shaped ceramic skids 2 that are tightly fitted into the ring-shaped ceramic skids 2 and have a key groove 2b or a spline groove on the inner surface 2a for fixing the circumferential position, and a shaft of the ceramic skid 2. A gas cutting torch lower roll comprising a steel sleeve 3 fitted to the body 1a between adjacent ceramic skids 2 and 2 and at the other end of the body 1a to fix the directional position. A transfer device under a gas cutting torch of a continuous casting facility, characterized in that a scraper 4 is disposed below the sleeve 3 between the ceramic skids 2, 2 in a state in which the roll is retracted downward.