JPS5877454A - Descaling device for band steel - Google Patents

Abstract

PURPOSE:To remove the blasting material after application so as not to remain on the surface of a steel plate by such an arrangement that the blasting material, which has been cast from a centrifugal casting device for descaling of a band steel, is transported away to outside the path line for band steels. CONSTITUTION:Centrifugal casting devices of the blasting material such as sand are arranged face to face at the lower and upper parts on both sides of the rising path line for steel plates in the blasting chamber 8. The surfaces of this steel plate is effectively descaled by this blasting material 3a-3d cast from these centrifugal casting device 9a-9d, to be sent off for the next process. In this case, the blasting material cast over the surfaces of the steelplate 2 on its both sides is transported to the front wall side of the chamber 8 by endless belt conveyors 10a-10c and 15a-15c to fall off from the bottom of each conveyor belt, wherefrom the material is taken out of the chamber 8. Thus the blasting material after work is surely removed from the surfaces of the steel plate.

Description

[Detailed description of the invention] Scale is attached to the surface of the steel plate produced by hot rolling, and it is necessary to remove this scale in order to obtain a beautiful steel plate by cold rolling. As a descaling method for hot-rolled steel sheets, a chemical method using acid, that is, a pickling method is generally used.

゛In recent years, there have been increasing demands for faster rolling speeds and for continuous pickling and cold rolling processes, but pickling alone requires extensive equipment due to limitations in descaling efficiency. Therefore, it is becoming impossible to meet these demands. In addition, the demand for reducing descaling costs (especially reducing acid consumption) is also high (and from this perspective, a review of the descaling method is urgently needed. It is being

In recent years, the development of new descaling methods that meet the above requirements has become active, and the main methods include the projection method, which descales steel plates by projecting an abrasive material (abrasive, shot, grid, sand, iron sand) onto the steel plate; Application of mechanical methods such as a grinding method in which scale is removed using a grindstone or a method in which scale is removed with a wire brush is being considered. Among them, the centrifugal force projection method, in which the abrasive material is projected using centrifugal force, is considered to be one of the most effective methods because it requires the least amount of energy for scaling in principle.

In order to descale the steel sheet under specified threading speed conditions using the centrifugal force projection method, multiple projection devices are required for each of the front and back surfaces of the steel plate, but in order for each projection device to work effectively,
It is important to remove the abrasive material after it has been projected so that it does not remain on the surface of the steel plate.

That is, as shown in FIG. 1, when the abrasive material projected by the projection device 01 remains on the surface of the steel plate 02 (remaining abrasive material 06), the next abrasive material projected by the projection device 04 is It is blocked by the remaining abrasive material 03 and does not act directly on the steel plate 02, which not only significantly reduces the scale effect (also, there is a risk that the residual abrasive material may cause scratches on the surface of the cast plate 02). There was a drawback.

The present invention was proposed with the aim of solving the above-mentioned drawbacks of the conventional Yue scale device. a centrifugal projection device for projecting abrasive material onto the surface of the steel strip through the pass line; This invention relates to a descaling device for steel strip, characterized in that it is equipped with an endless belt conveyor for transporting from a centrifugal projection device to the outside of a projection line.

The present invention will be explained below with reference to embodiments shown in FIGS. 2 and 3. In those figures, 8 is the projection room, 7α, 7d
are guide rollers 7 disposed on both sides of the lower part outside the projection chamber 8;
b, 7ty are guide rollers arranged on both sides of the upper part outside the projection chamber 8, and the hot rolled steel plate 2 is as shown in FIG. 2 (those guide rollers 7α, 7A).

7c and 7d to move inside the projection chamber 8 in the direction of the arrow. Then, the guide roller 7a
, 7h, 7c, and 7d form an e-sline of the vertical or nearly vertical steel strip (steel plate) 2. 9α,
As shown in FIG. 2, 9b is a centrifugal projection device for abrasive material such as sand grains, which is disposed facing each other at the lower and upper portions of both sides of the ascending path (pass line) of the steel plate 2 in the projection chamber 8. in,
Both the front and back surfaces of the steel plate 20 traveling upward are descaled by the sand grains etc. projected from the centrifugal projection device 9αt 9 b. 9c and 9d are on the upper and lower sides of the descending path (pass line) of the steel plate 2 in the projection chamber 8,
Centrifugal projection devices such as sand grains placed opposite each other,
Both the front and back sides of the steel plate 2 traveling downward are descaled by the sand grains etc. projected from the centrifugal projection devices 9c and 9d. 4 passes through the rear portions of both lower side walls of the projection chamber 8 and extends to the outside, one end is rotatably supported by a bearing 5 fixed to the side wall of the projection chamber 8, and the other end is connected to the projection chamber 8. A horizontal shaft 7 is connected to the output shaft of a drive motor 6 fixed to the outer wall of the horizontal shaft 4, and 7 is a horizontal shaft disposed parallel to the horizontal shaft 4 as shown in FIG. extends outward through the front portions of both lower side walls of the projection chamber 8, and is rotatably supported by bearings (not shown) fixed to the outside of both side walls of the projection chamber 8. 10α, 10b, and 10C are endless belt conveyors stretched between both horizontal shafts 4 and 7, and these endless belt conveyors 10α, 10A, and 10C are driven by a third drive motor 6 that drives and rotates the horizontal shaft 4. The endless illumination controllers 4 and 10 are made to run in the direction of the arrow in the figure.
Centrifugal projection device 9 arranged above α, 10A, 10c
The sand grains 3α and 5d that have been projected onto both the front and back surfaces of the steel plate 2 from a and 9d and have fallen are transferred to the front wall side of the projection chamber 8. 11 is rotatably supported at one end by a bearing 13 provided outside at a proper rear part of the upper side wall of the projection chamber 8;
a horizontal shaft 12 whose other end is connected to the output shaft of a drive motor 14 fixedly installed outside the upper part of the other side wall of the projection chamber 8 at a proper position at the rear;
has both ends attached to bearings (
An endless conveyor 15α, 15A is rotatably supported on a shaft (not shown) and has a horizontal axis parallel to the horizontal axis 11, and is connected between the two horizontal axes 11° and 12.

15C is stretched. And those endless illutoconveyors? The i5z, 15A, and 15c travel in the direction of the arrow in FIG. 3 as the horizontal shaft 110 rotates by the operation of the drive unit 14, and the centrifugal projection device 9bt 9 in the upper part moves in the direction of the arrow in FIG.
' Sand grains etc. 5b, 3c that are projected onto the steel plate 2 and fall
is transferred to the front wall side of the projection chamber 8.

One embodiment of the apparatus of the present invention is constructed as described above, and when the apparatus starts operating, the hot rolled steel plate 2 is moved to the guide roller 7a.
, 7b, 7c, 7d through the projection chamber 8 at a predetermined speed, the abrasive materials 3α, ”, b, 5c, such as sand grains, are projected from the centrifugal projection devices 9α, 9b, 9c, 9d, etc. ,3d
Both the front and back sides of the steel plate are effectively polished and descaled, and then sent to the next process. In this case, the abrasive material such as sand grains projected onto both the front and back sides of the steel plate 2 is transferred to the front wall side of the projection chamber 8 by the endless rollers 10α, 110b, 10C and 15α, 15h, 15C, and each endless roller is transferred to the downstream side of the roller. It falls downward from the end and is taken out of the projection chamber 8. Therefore, the abrasive material projected from each centrifugal projection device and descaled from the steel plate is quickly and reliably removed from the strip passing area (pass line of the strip). Therefore, there is no risk of scratches or the like occurring on the surface of the steel plate due to the accumulation of abrasive material in the plate passing area.

Since the apparatus of the present invention has the above-described configuration and operation, the present invention can eliminate the drawbacks of the conventional apparatus and efficiently descale hot-rolled steel sheets. In addition, a practical effect can be achieved in that it is possible to realize a strip plate descaling device that is free from the risk of scratches or the like on the steel plate.

Next, other embodiments of the present invention shown in FIGS. 4 and 5 differ only in that a cleaning platter 16 is attached to the end surface of each endless conveyor in contact with the steel plate 2, and the configuration of other parts is different. is the same as that of the above embodiment. In the case of this example, since the abrasive material adhering to the surface of the steel plate can be removed by the cleaning brush 16, more effective descaling can be achieved. A slight clearance is provided between the two to prevent direct contact between the two, but in this example, since the cleaning plaque 16 is attached to the end surface of the endless belt conveyor, 16, the clearance between the two is sealed, and there is an advantage that scratches and the like on the steel plate 2 due to the abrasive material getting caught in the clearance are prevented.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a conventional descaling method using a centrifugal projection device for strip steel, Figs. 2 and 3 are schematic explanatory diagrams of an embodiment of the present invention, and Fig. 2 is a longitudinal section. The front view and Figure 3 are as follows:
A sectional view taken along the line A-A in FIG. 2, FIGS.
FIG. 5 is a sectional view taken along the line C--C in FIG. 4. In FIGS. 2 to 5, 2: Steel plate (steel band), 4, 11: Horizontal shaft, 5.13: Bearing, 6.14: Drive motor (drive source), 7α, 7h. 7 Cr 7': Guide roller, 8: Projection chamber, 9α,
9 hours. 9c, 9d: Centrifugal projection device, 1012.1 (l, 10
C. 15α, 15h, 15C: Endless belt conveyor.

Claims (1)

[Claims] The nox line of the steel strip formed vertically or almost vertically and the pass line of the steel strip are respectively arranged on both sides, and
A centrifugal projection device that projects the abrasive material onto the surface of the steel strip with J-sline, and a centrifugal projection device that is installed below the centrifugal projection device, respectively.
An endless belt conveyor is provided that runs substantially perpendicular to the pass line and transfers the descaled abrasive material projected from the centrifugal projection device to the outside of the pass line of the steel band. A strip steel descaling device characterized by: