JPH0428417A - Method for descaling strip on tension leveller - Google Patents

Abstract

PURPOSE:To exactly descale in the dry state by attracting the scale being stripped out from the strip to the magnet roll and removing at the time of bending and extending the strip with a correcting roll. CONSTITUTION:The shape is corrected by bending and extending the strip 1 with the correcting roll while applying the tension to the strip 1. In this time, the scale 8 being stripped out from the strip 1 is attracted with the magnet roll 12 used also as the deflect roll set in adjacent to the correcting roll, and is stripped out from the surface of the strip 1. The magnet roll 12 is constituted, for example, so that the permanent magnet 7 is sticked in the tile like along the inner surface of the magnet roll 12. The scale 8 attracted to the surface of the magnet roll 12 is scraped off with the doctor knife 9 and then discharged through the dust collecting pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for removing scale from a strip in a tension leveler used for continuous shape correction of the strip.

<Prior Art> In general, a rolled steel strip is strain-removed by a tension leveler in the final process and formed into a flat strip. Fig. 4 shows an example of the roll arrangement of the tension leveler. In Fig. 4, 1 is a strip;
2 is a straightening roll, 3 is a backup roll, 4 is a deflection roll, and 5 is a ringer roll.

The straightening action is achieved by running the strip 1 at a constant speed while applying tension in the longitudinal direction and pushing the straightening roll 2 toward the strip 1 to bend and stretch the strip. Since the straightening roll 2 has a small diameter, it needs to be supported by a backup roll 3. The deflector roll 4 is used to keep the pass line constant.

In this case, when the slip 1 is bent and stretched, the scale on the surface is separated by 21 and gets caught between the rolls or accumulates in the gaps of the equipment, causing malfunction. As a method for removing this scale, a method is adopted in which a spray header 6 is provided on the rolled egg of the IC and water is sprayed onto the egg. The peeled off scale flows with water and is discharged outside the leveler. As a result, water remains on the strump 1, so the ringer
Low...Jlz5 is installed at the exit to drain water.

<Problems to be Solved by the Invention> As mentioned above, problems caused by scale accumulation, etc., have been solved by washing away the scale with water1, but on the other hand, this washing water may accelerate the deterioration of the equipment or cause damage to the inside of the bearing. New problems have arisen, such as water intrusion. Also, the treatment of large amounts of water containing scale has become a problem. Furthermore, since a small amount of water remains on the surface of the strip even after the ringer roll, there are cases where this causes rusting of the strip later and has an adverse effect on the quality of the product.

As a conventional technique for removing exfoliated scale without using water, 1. Disclosed is a method in which a suction tube is disposed behind the straightening rolls or between the rolls, and the peeled scale is suctioned into the suction tube and removed by 1-. However, with these conventional techniques, the scale cannot be sufficiently suctioned by the suction tube, and a considerable amount of the scale is lost to the suction tube.
There was a drawback that there was no fundamental solution since ζ and 7 remained on the lip (7 was sent to the next roll).

The present invention provides a method for removing scale from slips in tension levelers, which solves the problems caused by water and eliminates the drawbacks of the prior art, which eliminates scale in dry conditions. This is the purpose.

To achieve the above object, the present invention applies a tension to a strip of 4 tons, and then bends and stretches it with a straightening roll to correct the shape of the strip. In the removal method, the scale removed from the slip during bending and stretching by the straightening roll is adsorbed to a magnet roll that also serves as a deflection roll provided adjacent to the straightening roll, and the scale is removed from the slip. This is a method for removing scale from a strip in a tensigon leveler C, which is characterized by straightening the scale while removing it from the surface of the strip.

In addition, in the present invention, instead of installing a magnet roll that also serves as a deflection roll adjacent to the straightening roll, a magnet roll is installed independently from the deflection roll to remove peeled scale. Good too.

Function: Focusing on the relatively large-diameter deflation I roll placed adjacent to the straightening roll in the tension leveler, this deflection roll is used as a magnet roll to attract the peeled scale to the roll surface and form the strip. It is removed from the surface.

In general, the deflector rolls are arranged alternately with the straightening rolls, so the scale peeled off by the straightening rolls is adsorbed and removed by the magnet rolls before entering the next straightening hole, so there is no need to use water to remove the scale from the strip surface. scale can be removed.

The adsorbed scale is mechanically or magnetically removed from the roll at a position older than the Magnello strip, and then removed to the outside by another means such as vacuuming. It can be configured to output Jl'.

The reason why we used a magnetic roll for the differential troller is that it is physically difficult to install a new roll because the inside of the leveler is generally narrow.
If space is available, it is also possible to provide sufficient spacing between the straightening rolls and provide a magnetic roll independently.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 3 shows an example of the roll arrangement of the tensigon leveler according to the present invention, which is the same as the conventional example shown in FIG. 4 except that the sprue 1) and the ladder 6 are omitted in FIG.

In Fig. 3, the strip 1 is bent and stretched with straightening rolls 1 and 2 while applying tension, and a deflector roll is provided adjacent to the straightening roll 2 to form a scale that is peeled off from the strip 1 when the shape is straightened. The strip is removed from the surface of the strip 1 by adsorption to a magnet roll 12 that also serves as a deflector roll.The structure of the magnet roll 12 that also serves as a deflector roll is not particularly limited, but for example, as shown in FIG. It has a structure in which permanent magnets 7 are pasted in the form of tiles along the inner surface of the magnet.

A doctor knife 9 is in contact with the roll barrel surface of the magnet roll 12, and the scale 8 adsorbed from the surface of the strip 1 to the surface of the magnet roll 12 is scraped off by the doctor knife 9, and then connected to the rear part of the doctor knife 9. The dust is discharged to the outside via a dust collection pipe 10.

Further, as shown in FIG. 2, instead of attaching permanent magnets to the inner peripheral surface of the roll barrel of the magnet roll 12, a structure is adopted in which electromagnets 11 are arranged. A dust collection hood 13 is located close to the magnet roll 12, and excites the electromagnet 11 in the band from the strip l position to the dust collection hood 13, while exciting the electromagnet 11 in the band returning from the dust collection hood 13 to the strip 1. It is de-energized.

The scale 8 attracted to the surface of the magnet roll 12 by the electromagnet 11 excited from the surface of the strip L becomes TlTalTaIshikawa 1 magnet at the position of the dust collection hood I3, so the scale 8 is installed inside the dust collection hood 13. After being attracted by the electromagnet 11', the dust is reliably discharged to the outside through the dust collection pipe 10.

<Effects of the Invention> As explained above, according to the present invention, the scale that is peeled off during strip straightening can be reliably removed in a dry state without using water, so that the following effects can be obtained.

(1) Equipment deterioration due to water can be prevented.

(2) Rust of finished products can be prevented.

(3) Water treatment becomes unnecessary.

(4) Ringer roll becomes unnecessary.

In recent years, there has been an increasing need for leveling in a dry state in order to straighten black bark materials using a tension leveler, and the practical effects of the present invention are great.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the magnet roll according to the method of the present invention, FIG. 2 is a schematic cross-sectional view showing another embodiment of the magnet roll according to the method of the present invention, and FIG. FIG. 4 is a schematic explanatory diagram showing an example of roll arrangement according to the present invention, and FIG. 4 is a schematic explanatory diagram showing an example of roll arrangement according to a conventional example. l... Strip, 3... Backup roll, 4... Deflect roll, 6... Spray header, 8... Peeling scale, IO... Dust collection pipe, 12... Magnet roll, 2... Straightening roll, 5... Ringer roll, 7... Permanent magnet, 9... Doctor knife, 11... IT electromagnet 13... Dust collection hood.

Claims (1)

[Scope of Claims] 1. A method for removing scale from a strip in a tension leveler, which corrects the shape by bending and stretching the strip with a straightening roll while applying tension to the strip, the scale peeling off from the strip during bending and stretching with the straightening roll. A method for removing scale from a strip in a tension leveler, comprising: straightening the strip while removing it from the surface of the strip by adsorbing it to a magnet roll that also serves as a deflector roll provided adjacent to the straightening roll. 2. The method according to claim 1, wherein instead of providing a magnet roll that also serves as a deflection roll adjacent to the straightening roll, a magnet roll is provided independently from the deflection roll.