JP6788233B2 - Descaling device and its repair method - Google Patents

Description

The present invention relates to a descaling device that removes scale formed on the surface of a steel material by discharging high-pressure water, and in particular, a descaling device that makes erosion by high-pressure water less likely to occur and facilitates repair of eroded portions. And the repair method of the descaling device.

A descaling device usually sprays high-pressure water discharged from nozzles of descaling headers arranged above and below the transport path onto a steel material that is heated for hot rolling and transported on a table roller to heat the steel material. The scale formed on the surface of the steel material is removed by the impact of the collision of the high pressure water.

By the way, in the conventional descaling device, when the steel material does not exist or the width of the steel material is narrower than the discharge width of the high-pressure water, the high-pressure water discharged from the nozzle is located on the opposite side of the nozzle to guide the steel material. It may collide with the surface of the apron, and this high-pressure water erodes the apron, or the high-pressure water that bounces off the surface of the apron (hereinafter referred to as "rebound water") erodes the surrounding equipment.

Therefore, the conventional descaling device divides the discharge width of high-pressure water in stages, adjusts the discharge width of high-pressure water according to the width of the steel material, and discharges high-pressure water from nozzles facing each other. Erosion was suppressed by canceling each other's momentum. Further, as described in Patent Document 1, erosion is also prevented by providing the apron with an opening through which the high-pressure water discharged from the nozzle does not collide with the steel material.

JP-A-2015-14502

However, according to the conventional apron erosion prevention measures described above, the width of the steel material and the discharge width of the high-pressure water are not completely the same because the discharge width of the high-pressure water is set in stages, and the steel material. The part of the apron corresponding to the part where is not present may be eroded. In addition, it may not be possible to completely cancel each other's high-pressure water due to the displacement of the nozzle due to vibration and the relationship of equipment connection. Further, when the equipment exists in the back of the apron, if the opening is provided in the apron as in Patent Document 1, the high-pressure water passing through the opening collides with the equipment. Therefore, the opening should be provided in the apron. I can't do that.

In such a case, it is inevitable that the high-pressure water collides with the apron, and the apron eroded by the collision of the high-pressure water has conventionally been repaired by overlay welding. However, since the rate of erosion is high, the overlay repair must be performed twice a month at a high frequency, and there is a problem that the repair cost becomes high. In addition, since it is necessary to remove the apron for overlay repair, there is also a problem that production must be stopped for a long time for repair.

Therefore, an object of the present invention is to provide a descaling device and a method for repairing the apron, which makes it difficult for the apron to be eroded by the collision of high-pressure water and can easily repair the eroded portion.

The descaling device of the present invention aims to solve the above problems advantageously.
A descaling device that uses high-pressure water to remove scale formed on the surface of steel materials transported by multiple table rollers.
The apron placed between the table rollers and
A descaling header having a nozzle facing the apron and removing scale formed on the surface of a steel material passing between the nozzle and the apron with high-pressure water discharged from the nozzle.
A high-hardness tip that is detachably attached to the apron and fixed to the portion of the apron that the high-pressure water from the nozzle collides with.
It is characterized by having.

Further, the method of repairing the descaling device of the present invention is as follows.
A descaling device that uses high-pressure water to remove scales formed on the surface of steel materials transported by multiple table rollers.
The apron placed between the table rollers and
A descaling header having a nozzle facing the apron and removing scale formed on the surface of a steel material passing between the nozzle and the apron with high-pressure water discharged from the nozzle.
In repairing the eroded portion of the apron by the high-pressure water of the descaling device equipped with
A high-hardness tip is detachably attached to the apron, and the high-hardness tip is fixed to the portion of the apron where the high-pressure water from the nozzle collides.
The high-hardness tip is attached to and detached from the apron and replaced.

In the descaling device of the present invention,
A descaling header having a nozzle facing an apron arranged between the plurality of table rollers and a scale formed on the surface of a steel material conveyed by the plurality of table rollers is conveyed by the table rollers to the nozzle. The scale formed on the surface of the steel material passing between the apron and the apron is removed by the high-pressure water discharged from the nozzle, and is detachably attached to the apron, and the high-pressure water from the nozzle collides with the apron. The high-hardness tip fixed to the portion makes it difficult for the apron portion to collide with the high-pressure water to be eroded by the collision and facilitates the repair of the eroded portion.

Therefore, according to the descaling device of the present invention, the erosion rate of the apron due to the collision of the high-pressure water discharged from the nozzle can be suppressed, and even if the apron is eroded, the eroded portion can be easily replaced in a short time. Therefore, the repair cost of the apron can be significantly reduced.

Further, according to the repair method of the descaling device of the present invention, it is a descaling device that removes scale formed on the surface of a steel material conveyed by a plurality of table rollers with high-pressure water, and is arranged between the table rollers. An apron and a descaling header having a nozzle facing the apron and removing scale formed on the surface of a steel material passing between the apron and the apron with high-pressure water discharged from the apron. When repairing the eroded portion of the apron by the high-pressure water of the equipped descaling device, a high-hardness tip is detachably attached to the apron, and the high-hardness tip collides with the high-pressure water from the nozzle. Since it is fixed to the apron part and the high hardness tip is attached to and detached from the apron and replaced, even if the apron is eroded by the collision of high pressure water discharged from the nozzle, the eroded part is easily replaced in a short time. Because it can be done, the repair cost of the apron can be significantly reduced.

In the descaling device and the repair method thereof of the present invention, through holes for fitting the high hardness chips are provided in the apron for the number of nozzles facing the apron, and the heights are provided in the through holes. Hardness chips may be detachably fitted to secure the high hardness chips to the apron. In this way, the high-pressure water from each nozzle can be surely collided with the high-hardness chip, and the erosion of the apron due to the collision of the high-pressure water can be suppressed.

Further, in the descaling device and the repair method thereof of the present invention, the high hardness tip may be supported and a tip holder detachably attached to the apron may be provided. In this way, the high-hardness tip can be detachably attached to the apron using a tip holder that is cheaper than the high-hardness tip, so that the repair cost of the apron can be further reduced.

It is a side view which shows the basic structure of one Embodiment of the descaling apparatus of this invention in a partial cross section. FIG. 5 is an enlarged cross-sectional view showing an upper descaling header and an upper apron of the descaling device of the above embodiment having the above basic configuration. It is an exploded perspective view which shows the above-mentioned upper apron and the high hardness tip which is attached and fixed to the apron via a tip holder. It is sectional drawing which shows the high hardness tip and the tip holder of the descaling apparatus of the said embodiment used in one Embodiment of the repair method of the descaling apparatus of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a side view showing a basic configuration of an embodiment of the descaling device of the present invention in a partial cross section, in which reference numeral 1 indicates a descaling device.

The descaling device 1 of this embodiment is provided in a hot rolling line of a steel material, and as a basic configuration, is adjacent to a plurality of table rollers 2 that convey the hot rolled steel material S in the direction indicated by an arrow. It is provided with upper and lower aprons 3 and 4 located between the table rollers 2 and guiding the steel material S, and upper and lower descaling headers 5 and 6 located above and below the upper and lower aprons 3 and 4, respectively.

The upper and lower descaling headers 5 and 6 each have a plurality of nozzles 7 extending in a direction orthogonal to the paper surface and aligning with each other in the extending direction, and the nozzles 7 of the upper descaling header 5 have a plurality of nozzles 7. The nozzle 7 of the lower descaling header 6 faces the upper apron 3 through the opening 4a formed in the lower apron 4, while the nozzle 7 of the lower descaling header 6 faces the lower apron 4 through the opening 3a formed in the upper apron 3. ing.

According to the above basic configuration, the descaling device 1 of this embodiment is formed on the surface of the steel material S which is preheated and passes between the nozzles 7 of the upper and lower descaling headers 5 and 6 and the upper and lower aprons 3 and 4 facing them. The scale is removed by the impact of collision of high-pressure water W (only the one from nozzle 7 of the lower descaling header 6 is shown in the figure) supplied from the upper and lower descaling headers 5 and 6 and discharged from those nozzles 7. ..

FIG. 2 is an enlarged cross-sectional view showing the upper descaling header 5 and the upper apron 3 of the descaling device of the above embodiment having the above basic configuration, and FIG. 3 shows the upper apron 3 and the chip holder 8 therein. It is an exploded perspective view which shows the high hardness chip 9 which is attached and fixed through.

That is, in addition to the above basic configuration, the descaling device 1 of this embodiment is a place where the high-pressure water W from the nozzle 7 of the lower descaling header 6 collides with the upper apron 3 when the narrow steel material S passes through. A pedestal 3b with a screw hole for attaching and detaching the chip holder 8 is provided on the upper surface side of both sides in the longitudinal direction, and the chip holder 8 and the high hardness chip 9 are fitted in a place where the high-pressure water W collides. A through hole 3c for the purpose is provided.

FIG. 4 is a cross-sectional view showing the high hardness chip 9 and the chip holder 8. As shown in the drawing, the chip holder 8 can be detachably attached and fixed to the screw hole pedestal 3b of the upper apron 3 with bolts 10. A shaft portion having a flat upper portion formed with a bolt hole 8a and having a cross-sectional shape that hangs down from the flat upper portion so as to be able to fix and support the high-hardness chip 9 and fits into the through hole 3c of the upper apron 3. A fitting recess 8b having a T-shaped cross section and extending in a direction orthogonal to the paper surface is formed at the tip of the shaft portion. Further, the high hardness chip 9 also has a cross-sectional shape that fits into the through hole 3c of the upper apron 3, and has a T-shaped cross section at the rear end portion, and in FIG. 4, a fitting convex portion 9a extending in a direction orthogonal to the paper surface. The fitting recess 8b of the chip holder 8 and the fitting convex portion 9a of the high hardness chip 9 are tightly fitted to each other by their relative movement in the extending direction.

The shaft portion of the tip holder 8 and the cross-sectional shape of the high-hardness tip 9 that fit into the through hole 3c of the upper apron 3 correspond to the spreading shape of the high-pressure water W from the nozzle 7, for example, oval or circular. It is preferably rectangular or the like, and in the illustrated example, it is oval. Further, the cross-sectional shape of the fitting recess 8b of the shaft portion of the tip holder 8 and the fitting convex portion 9a of the high hardness tip 9 may be a dovetail shape instead of a T shape, and further, the tip holder 8 may have a dovetail shape. A fitting convex portion may be provided on the shaft portion, and a fitting concave portion may be provided on the high hardness tip 9.

The repair method of the descaling device of the above embodiment using the descaling device 1 of the present embodiment configured in this way is supported by fitting the shaft portion of the chip holder 8 and the shaft portion thereof when descaling the steel material S. The high-hardness chip 9 was fitted into the through hole 3c of the upper apron 3, and the flat upper part of the chip holder 8 was fixed to the upper threaded pedestal 3b of the upper apron 3 with bolts 10. When repairing against erosion, loosen the bolt 10 and replace the chip holder 8 and the eroded high hardness chip 9 integrally, or remove the high hardness chip 9 from the chip holder 8 and only the high hardness chip 9 is new. Exchange for something.

As the material of the high hardness chip 9, it is preferable that the chip 9 is not easily eroded and the unit price of the chip is low. For example, alumina, silicon carbide, high hardness steel (SK3) or the like can be used.

Therefore, according to the descaling device 1 of this embodiment and the repair method of the descaling device of this embodiment using the same, it is easy to replace the high hardness chip 9 at the time of repair, and even if the bolt 10 is loosened, it can be passed. The high hardness chip 9 does not fall on the plate line. Further, since the high hardness tip 9 is attached to the tip of the tip holder 8, the structure is such that even when the high hardness tip 9 is eroded, it can be easily replaced and repaired.

When the descaling device 1 of this embodiment was carried out on a hot rolling line of a steel mill using a high hardness chip 9 made of alumina, it was conventionally necessary to repair the apron erosion by high-pressure water twice a month. However, the descaling device 1 of this embodiment can be operated for 6 months without replacement of the high hardness chip 9 and without repair. Also, during the repair, the conventional overlay repair required 12 hours or more at a time, but the repair method of the descaling device of this embodiment can be repaired in half 6 hours. From the above, repair costs have also been significantly reduced.

Although the above description has been made based on the illustrated example, the present invention is not limited to the above example. For example, in the above embodiment, the high hardness tip 9 is detachably attached only to the upper apron 3, but it is attached to the lower apron 4. Similarly, the high hardness chip 9 may be detachably attached.

Further, the tip holder 8 and the high-hardness tip 9 may be formed by providing a male screw and a female screw as fitting shapes and screw-bonding them to each other, or integrally forming them. Then, the tip holder 8 may be omitted, and the apron itself may be provided with a fitting shape for detachably mounting the high hardness tip 9.

Thus, according to the descaling device of the present invention, the erosion rate of the apron due to the collision of the high-pressure water discharged from the nozzle can be suppressed, and even if the apron is eroded, the eroded portion can be easily replaced in a short time. , The repair cost of the apron can be significantly reduced.

Further, according to the repair method of the descaling device of the present invention, even if the apron is eroded by the collision of the high pressure water discharged from the nozzle, the eroded part can be easily replaced in a short time, so that the repair cost of the apron Can be significantly reduced.

1 Descaling device 2 Table roller 3 Upper apron 3a Opening 3b Pedestal with screw hole 3c Through hole 4 Lower apron 4a Opening 5 Upper descaling header 6 Lower descaling header 7 Nozzle 8 Chip holder 8a Bolt hole 8b Fitting recess 9 High hardness chip 9a Fitting convex part 10 bolt S Steel material W High pressure water

Claims (6)

In a descaling device that removes scale formed on the surface of steel material conveyed by multiple table rollers with high-pressure water.
The apron placed between the table rollers and
A descaling header having a nozzle facing the apron and removing scale formed on the surface of a steel material passing between the nozzle and the apron with high-pressure water discharged from the nozzle.
A high-hardness tip that is detachably attached to the apron and fixed to the portion of the apron that the high-pressure water from the nozzle collides with.
A descaling device characterized by having. The apron is provided with through holes for fitting the high-hardness tip for the number of nozzles facing the apron.
The descaling device according to claim 1, wherein the high-hardness chips are detachably fitted into the through holes and fixed to the apron. The descaling device according to claim 1 or 2, wherein the high-hardness tip is supported and a tip holder that is detachably attached to the apron is provided. A descaling device that uses high-pressure water to remove scale formed on the surface of steel materials transported by multiple table rollers.
The apron placed between the table rollers and
A descaling header having a nozzle facing the apron and removing scale formed on the surface of a steel material passing between the nozzle and the apron with high-pressure water discharged from the nozzle.
In repairing the eroded part of the apron by the high-pressure water of the descaling device equipped with
A high-hardness tip is detachably attached to the apron, and the high-hardness tip is fixed to the portion of the apron where the high-pressure water from the nozzle collides.
A method for repairing a descaling device, which comprises attaching and detaching the high hardness tip to and from the apron and replacing the tip. The apron is provided with through holes for fitting the high-hardness tip for the number of nozzles facing the apron.
The method for repairing a descaling device according to claim 4, wherein the high-hardness chips are detachably fitted into the through holes and fixed to the apron. The method for repairing a descaling device according to claim 4 or 5, wherein a tip holder that supports the high-hardness tip is detachably attached to the apron.

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