JPH11216513A - Steel member descaling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To descale a steel member efficiently and uniformly in the width direction by preventing interference of high-pressure water between adjacent rotating heads when the hot steel coming from a heating furnace is descaled by means of high-pressure water jetted through nozzles attached to multiple rotating heads. SOLUTION: The rotation directions of multiple rotating heads 2 having high-pressure water jetting nozzles 1, which are provided at prescribed spacings toward a steel member 4 are opposed to each other, or the rotation axes of the rotating heads 2 are mutually inclined in a reverse direction along the moving line of the steel member 4, or the rotating heads 2 are arranged in a manner that every two of them are shifted in position from each other along the moving line of the steel member 4. By jetting the high-pressure water to the steel 4 through the nozzle of such rotating heads, the interference of high- pressure water between the adjacent rotating heads is prevented, and uniform and efficient descaling can be done to the steel member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a descaling device for removing a scale of a hot-rolled slab or a steel plate.

[0002]

2. Description of the Related Art Generally, a hot-rolled steel plate or a thick steel plate is manufactured by rolling a steel material such as a slab heated to a high temperature of 1000 ° C. or more in a heating furnace to a predetermined thickness by a rolling mill.

At this time, a thick oxide film, that is, a primary scale is formed on each surface of the high-temperature steel material discharged from the heating furnace. When rolling high-temperature steel with scale attached,
During the rolling process, flaws are formed on the surface of the rolling roll, the flaws are transferred to the material to be rolled, and the scale attached to the rolling roll bites into the material to be rolled, thereby deteriorating the surface quality of the product. Instead, if the scale is deeply caught, it becomes a defective product and causes a reduction in product yield.

[0004] The material to be rolled, such as a slab or a steel sheet, taken out of a heating furnace is hot even during rolling.
In the rolling process, a secondary scale is formed again on the steel surface. When the secondary scale grows, as in the case of the primary scale, flaws are formed on the surface of the rolling roll, and a scaled surface flaw is generated in the product. Further, in the rolling process, if scale unevenness occurs in the material to be rolled, the heat transfer coefficient of the material to be rolled varies depending on the thickness of the scale,
At the time of cooling after rolling, the material of the product becomes uneven, leading to deterioration in quality.

Therefore, when rolling a high-temperature steel material, it is necessary to uniformly and uniformly remove scales formed in the steel material before rolling. As a means for removing scale from hot high-temperature steel material, a number of methods have been proposed for descaling by injecting high-pressure water onto the surface of the steel material (for example, Japanese Patent Publication No. 49-37495). FIG. 16 shows an example of such a descaling device by injection of high-pressure water. As shown in a schematic front view in FIG. 16A and a schematic side view in FIG. Moving high temperature steel 4
Above is a header 11 having a plurality of nozzles 1
The scale on the surface of the steel material is removed by spraying high-pressure water 3 provided in the width direction A of the high-temperature steel material 4 from the nozzle 1 toward the surface of the high-temperature steel material 4.

As the nozzle 1, a flat spray nozzle is mainly used. As shown in a schematic plan view in FIG. The width of the high-temperature steel material 4 is covered by about 30 mm, so that the scale is removed over the area 6.

However, recently, in order to improve the material, Si,
Cr, Ni, steel materials to which elements such as Cu are added increase, and in the case of high-temperature steel materials containing such elements, it is difficult to remove scales formed on the steel material surface by the above-described conventional method. is there. Therefore, a method of improving the descaling ability by increasing the pressure and the water density of the high-pressure water injected onto the steel material or optimizing the injection distance of the high-pressure water to the steel material has been attempted.

However, in order to increase the injection pressure of the high-pressure water, expensive high-pressure pumps and high-pressure pipes must be installed, which leads to a significant cost increase. In addition, when the water density of the high-pressure water is increased, the temperature of the hot steel material is reduced by the descaling, which causes a problem that the subsequent rolling conditions are restricted.

When the injection distance of the high-pressure water to the high-temperature steel material is reduced, the injection region 5 of the high-pressure water shown in FIG. Therefore, in order to spray high-pressure water over the entire width of the high-temperature steel material 4, the number of nozzles 1 must be increased or the spray angle of each nozzle must be increased.
As a result, it is not possible to maintain the uniformity of the nozzle mounting space, the pipe strength, or the flow rate, and it is actually difficult to freely set the injection area.

As means for solving the above-mentioned problem, there has been proposed a technique for removing scale on the surface of the high-temperature steel material 4 using a rotary nozzle. That is, as shown in a schematic front view of FIG. 17 (a) and a schematic plan view of the nozzle head in FIG. 17 (b), a plurality of nozzles 1 are arranged at predetermined intervals on the circumference of a disk-shaped rotary head 2. The high-pressure water 3 is sprayed from the nozzle 1 toward the high-temperature steel 4 while the head 2 is horizontally rotated in the direction of the arrow. As a result, as shown in FIG. 17 (c), the high-pressure water injection region 5 with respect to the surface of the high-temperature steel material 4 has a large-area circular shape, and the descaling ability can be improved. The scale is peeled over the region 6. 7
Is the scale remaining area.

Such a rotary nozzle is a technique that has been put to practical use in the field of high-pressure water cleaning. By rotating a rotary head having a plurality of nozzles at a high speed, the cleaning area can be increased. Since the injection area per nozzle is small, the injection density is high, and excellent cleaning ability can be obtained.

Further, since the nozzle is rotating, the amount of water injected per unit area of the material to be treated depends on the diameter of the rotating head, the number of nozzles, and the relative moving speed between the material to be treated and the rotating head. In other words, the water density per nozzle and the amount of water injected per unit area of the workpiece can be controlled independently.

Japanese Patent Application Laid-Open No. 7-60333 (hereinafter referred to as Prior Art 1) discloses a technique in which the above-described high-pressure water cleaning technique using a rotary nozzle is applied to descaling of a high-temperature steel material. Japanese Patent Application Publication No. 7-148515 (hereinafter referred to as Prior Art 2) discloses a technique in which a rotary nozzle is applied near a rolling roll.

If the descaling is performed by the rotary nozzle as in the prior arts 1 and 2, the density of water per nozzle can be increased, so that the descaling ability can be improved.

Further, the amount of water per unit area sprayed on the high-temperature steel material can be freely set by appropriately selecting the diameter of the rotary head, the number of nozzles, and the speed of transporting the steel material, so that a high descaling capability can be obtained. While maintaining
Since it is possible to suppress a decrease in the temperature of the high-temperature steel material, and since the injection area per rotating head does not change significantly, the injection distance can be set relatively easily to an appropriate value.

[0016]

According to the prior arts 1 and 2 described above, there are the following problems in performing the descaling of a steel material using a rotary nozzle. That is, according to the rotary nozzle, the injection area is increased as compared with the conventional flat nozzle, but it is difficult to descale the entire width direction of a high-temperature steel material such as a slab with one rotary nozzle.

Therefore, as shown in a schematic front view in FIG. 18A, a plurality of rotary heads 2 are arranged in the width direction of the high-temperature steel material 4, and the nozzles 1 provided in each of the plurality of rotary heads 2 are arranged. Therefore, if high-pressure water 3 is sprayed on high-temperature steel material 4,
As shown in FIG. 8 (b), it is possible to widen the descaling of the high-temperature steel material in the width direction. Reference numeral 6 denotes a scale peeling region, and reference numeral 7 denotes a scale remaining region.

However, when the high-pressure water 3 is jetted from the nozzles 1 provided in each of the plurality of rotary heads 2 to the hot steel 4, the jets of high-pressure water interfere with each other on the high-temperature steel 4. . That is, as shown in FIG.
The high-pressure water injected from the nozzle of one rotary head 2a collides with the high-temperature steel material 4 and becomes the horizontal flow water shown by the arrow 8a, and the high-pressure water injected from the nozzle of the other rotary head 2b is shown by the arrow 8b. It diffuses to the surroundings as water flowing sideways.

As a result, the lateral flow water 8a from one rotary head 2a enters the high-pressure water jetting region 5b from the other rotary head 2b, and the horizontal flow water 8b from the other rotary head 2b Since the high-pressure water injected from the nozzles of the two rotary heads 2a and 2b enters the high-pressure water injection region 5a from 2a, the high-pressure water injected from the nozzles of the two rotary heads 2a and 2b is prevented from directly colliding with the surface of the high-temperature steel material 4. As a result, an intermediate area between the two rotary heads 2a and 2b, that is, the high-pressure water injection area 5
In portions close to a and 5b, the descaling ability is reduced, and a problem that scale unevenness occurs occurs.

In the prior art 1, the arrangement of the nozzles attached to the rotating shaft of one rotary head is limited, but there is no consideration to prevent the interference of high-pressure water between adjacent rotary heads. Not. Further, in the prior art 2, the rotation axis of the rotary head is inclined in a direction opposite to the rolling direction to prevent the peeling scale from being caught in the rolling roll, but the high pressure water between the adjacent rotary heads is prevented. No consideration is given to preventing interference.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a high-temperature steel material such as a high-temperature slab or a steel plate discharged from a heating furnace by a high-pressure steel jet injected from nozzles attached to a plurality of rotary heads. An object of the present invention is to provide a device capable of preventing high-pressure water interference between adjacent rotary heads when performing descaling with water, and performing uniform and efficient descaling in the width direction.

[0022]

According to a first aspect of the present invention, a plurality of rotary heads each having a high-pressure water injection nozzle are provided at predetermined intervals toward a steel material to be descaled, Injecting high-pressure water from the nozzle toward the steel material while rotating the rotating head, and removing the scale generated in the steel material, in a steel descaling device, the rotation direction of each of the plurality of rotating heads mutually The feature is that the direction is reversed.

According to a second aspect of the present invention, in the above descaling device, the rotating shafts of the plurality of rotating heads are alternately inclined at a predetermined angle in opposite directions along the moving line of the steel material. The invention according to claim 3, wherein the rotating shaft of each of the plurality of rotating heads is directed along a moving line of the steel material in a moving direction and / or a direction opposite to the moving direction, It is characterized in that every other unit is inclined at a predetermined angle.

According to a fourth aspect of the present invention, in the apparatus according to the second or third aspect, the rotation directions of the plurality of rotary heads are opposite to each other. The tilt angle of the rotating head whose axis is tilted is 5
The present invention is characterized in that the difference between the inclination angles of adjacent rotary heads whose rotary axes are tilted is 10 ° or less.

According to a seventh aspect of the present invention, in the descaling apparatus, a plurality of rotary heads are provided so as to be displaced from each other along a steel material moving line. Things.

According to an eighth aspect of the present invention, in the apparatus according to the seventh aspect, the rotational directions of the plurality of rotary heads are opposite to each other. 2. The rotating shaft of the rotary head is alternately inclined at a predetermined angle in the opposite direction along a moving line of the steel material.
In the invention described in Item No. 0, the rotating shafts of the plurality of rotating heads are inclined at a predetermined angle every other unit along the moving line of the steel material in the moving direction and / or the direction opposite to the moving direction. Is characterized by the fact that

According to an eleventh aspect of the present invention, in the apparatus according to the ninth or tenth aspect, the tilt angle of the rotary head whose rotary shaft is tilted is within a range of 5 to 30 °. The described invention is characterized in that the difference between the inclination angles of adjacent rotary heads whose rotational axes are inclined is 10 ° or less.

According to the apparatus of the present invention, when the high-temperature steel material discharged from the heating furnace is descaled by the high-pressure water jetted from the nozzles attached to the plurality of rotating heads, The high-pressure water injected from each nozzle, the lateral flow water on the high-temperature steel material, is prevented from interfering with the high-pressure water injection region on the steel material, thereby preventing high-pressure water interference between adjacent rotary heads. It is possible to suppress a decrease in the descaling ability, and thereby, the high-temperature steel material can be descaled uniformly and efficiently in the width direction.

[0029]

Next, a descaling device according to the present invention will be described in detail with reference to the drawings. FIG. 1 (a) is a schematic front view showing an apparatus according to a first embodiment of the present invention, and FIG. 1 (b) is an apparatus shown in FIG. 1 (a) in which high-pressure water injected from a nozzle is applied to hot steel. FIG. 3 is a schematic plan view showing a state after a collision. As shown in FIG.
For example, two disk-shaped rotary heads 2a and 2b are vertically arranged on the same line in the width direction at a predetermined interval above the high-temperature steel material 4 moving in the direction of. Each of the rotary heads 2a and 2b is provided with a plurality of nozzles 1 at predetermined intervals on the circumference thereof, and high-pressure water 3 is injected from the nozzles 1 toward the high-temperature steel 4 so that the high-temperature steel 4 Is similar to a conventional device.

In the device according to the first embodiment of the present invention, the rotating directions of two adjacent rotary heads 2a and 2b are opposite to each other. As a result, as shown in FIG. 1 (b), the flow of the laterally flowing water 8a, 8b on the high-temperature steel material 4 due to the high-pressure water jetted from each nozzle 1 of the one rotating head 2a and the other rotating head 2b is , The horizontal flow waters 8a and 8b do not enter the high-pressure water injection areas 5a and 5b on the steel material 4.

Therefore, the high-pressure water jetted from the nozzles 1 of the adjacent rotary heads 2a, 2b is supplied to the horizontal flow water 8a, 8b.
b directly impinges on the surface of the high-temperature steel material 4 without being hindered by b, so that the descaling ability is reduced in the vicinity of the high-pressure water jetting regions 5a and 5b as in the related art, and scale unevenness occurs. Does not occur, and the scale of the large area 6 is peeled off.

FIG. 2 is a schematic plan view showing an apparatus according to a second embodiment of the present invention, FIG. 3 is a schematic side view thereof, and FIG. 4 is a state after high-pressure water injected from a nozzle collides with a high-temperature steel material. FIG. As shown in FIGS. 2 and 3, in the apparatus of this embodiment, a plurality of high-temperature steel members 4 moving in the direction of arrow B are arranged at predetermined intervals on the same line in the width direction thereof. Each of the rotating shafts of three rotating heads 2 including, for example, a first head 2a, a second head 2b, and a third head 2c, has a nozzle 1 and a moving direction B along a moving line of the high-temperature steel material 4. , Are alternately inclined at a predetermined angle in a direction opposite to the movement direction B.

That is, in the illustrated example, the rotating shafts of the first head 2a and the third head 2c on both sides are
, And the rotation axis of the intermediate second head 2 b is inclined in the direction opposite to the direction of movement of the high-temperature steel material 4.

As a result, as shown in FIG. 4, the high-pressure water jetted from the nozzles of the inclined rotary heads 2a, 2b, 2c is subjected to lateral flow water 8a, 8
As for b and 8c, although a part thereof flows in the direction 9b opposite to the tilt direction of the rotary head, the flow in the same direction 9a as the tilt direction of the rotary head becomes dominant,
The proportions of the transverse flow water flowing in each direction are opposed, and the interference film 10 is generated between the high-pressure water injection regions 5a, 5b, and 5c.

Accordingly, the high-pressure water jetted from the nozzles 1 of the adjacent rotary heads 2, the cross-flowing water 8 a, 8 b, 8 c on the hot steel 4, makes the high-pressure water injection areas 5 a, 5 b, 5c is prevented, and a decrease in the descaling ability in the intermediate region of the rotary head can be suppressed.

The directions of rotation of the rotary heads 2a, 2b, 2c may be the same, or may be opposite to each other as in the device of the first embodiment. As described above, if the adjacent rotary heads 2a, 2b, and 2c are alternately inclined in the moving direction of the high-temperature steel material 4 and in the direction opposite to the moving direction, and are alternately rotated in the opposite direction. In addition, it is possible to more reliably suppress a decrease in the descaling ability.

FIGS. 5, 6 and 7 show a third embodiment of the present invention.
It is a schematic plan view showing an apparatus of an embodiment. In the apparatus of this embodiment, a plurality of disk-shaped rotary heads 2 each having a plurality of nozzles 1 provided above the high-temperature steel material 4 at predetermined intervals on the same line in the width direction thereof are rotated. The axis is inclined along the movement line of the high-temperature steel material 4 in the same direction as the steel material movement direction B or in the opposite direction every other unit.

That is, in the example shown in FIG. 5, the first of the five disk-shaped rotary heads 2a, 2b, 2c, 2d, 2e
The rotation axes of the head 2a, the third head 2c, and the fifth head 2e are inclined at a predetermined angle in the moving direction B of the high-temperature steel material 4, and the rotation axes of the second head 2b and the fourth head 2d are
It is perpendicular to the high temperature steel 4. In the example shown in FIG. 6, the rotation axes of the first head 2a, the third head 2c, and the fifth head 2e are inclined at a predetermined angle in a direction opposite to the moving direction B of the high-temperature steel material 4. In the example shown in 7,
The rotation axis of the first head 2a and the fifth head 2e is
The rotation axis of the third head 2c is inclined in the direction opposite to the movement direction B of the high-temperature steel material 4, and the rotation axis of the third head 2c is inclined in the direction opposite to the movement direction B of the high-temperature steel material 4.
The rotation axis of the head 2 d is perpendicular to the high-temperature steel material 4. In addition, each rotary head 2a, 2b, 2c, 2d, 2e
May be all in the same direction or every other unit may be in the opposite direction.

FIG. 8A is a schematic front view showing an apparatus according to a fourth embodiment of the present invention, and FIG. 8B shows a state after high-pressure water injected from a nozzle collides with a high-temperature steel material. FIG. As shown in the drawing, in the apparatus of this embodiment, a plurality of nozzles 1 are provided vertically above the high-temperature steel material 4 moving in the direction of arrow B at predetermined intervals in the width direction thereof. Plural disk-shaped rotary heads 2
However, the position is shifted by one unit along the moving line of the high-temperature steel material 4. For example, as shown in FIG. 8B, of three rotating heads including a first head 2a, a second head 2b, and a third head 2c, the first rotating heads on both sides.
The head 2a and the third head 2c are arranged on the same line in the width direction of the high-temperature steel material 4, and the center second head 2b
Are displaced at least one unit in front of the high-temperature steel material 4 in the moving direction.

As described above, the three rotary heads 2a, 2
As shown in FIG. 8 (b), the high-temperature steel material is formed by the high-pressure water 3 sprayed from each nozzle 1 of each rotary head, as shown in FIG. The lateral flow water 8a, 8b, 8c on the high temperature steel material 4 is prevented from entering the high pressure water injection areas 5a, 5b, 5c, and a decrease in the descaling ability of the intermediate second head 2b is suppressed. As a result, the occurrence of uneven scale is prevented, and the scale in the wide area 6 is peeled.

FIG. 9 (a) is a schematic plan view showing an apparatus according to a fifth embodiment of the present invention, and FIG. 9 (b) shows a state after high-pressure water injected from a nozzle collides with a high-temperature steel material. FIG. As shown in the drawing, in the apparatus of this embodiment, a plurality of nozzles 1 each having a plurality of nozzles 1 are provided above a high-temperature steel material 4 moving in the direction of arrow B at predetermined intervals in the width direction thereof. The base disk-shaped rotary head 2 includes 1
For each base, it is arranged along the movement line of the high-temperature steel material 4 with its position shifted, and its rotation axis is alternately inclined in the movement direction B of the high-temperature steel material and in the direction opposite to the movement direction B. .

That is, in the example shown in FIG. 9A, of the three disk-shaped rotary heads 2a, 2b and 2c, the first head 2a and the third head 2c on both sides are made of the hot steel material 4. It is arranged on the same line in the width direction, and its rotation axis is inclined at a predetermined angle toward the moving direction B of the high-temperature steel material 4, and the central second head 2b moves its position at least rearward in the moving direction of the high-temperature steel material 4. The rotating shaft is inclined by a predetermined angle in a direction opposite to the moving direction B of the high-temperature steel material 4.

By arranging the rotary head 2 in this manner, as described with respect to the device of the second embodiment,
Lateral flow water 8a, 8 of high-pressure water 3 injected from each nozzle of rotary heads 2a, 2b, 2c on hot steel 4
b, 8c, the flow in the same direction 9a as the rotary head becomes dominant, and a part of the flow becomes in the direction 9b opposite to the tilt direction of the rotary head, and the high-pressure water injection region 5a , 5b, 5c, the interference film 10 is generated.

Accordingly, the high-pressure water jetted from the nozzles 1 of the adjacent rotary heads 2 and the laterally flowing waters 8a, 8b, 8c on the high-temperature steel material 4 form the high-pressure water injection regions 5a, 5b, 5c on the high-temperature steel material 4. Is prevented, and a decrease in descaling ability in the intermediate region of the rotary head can be suppressed.

FIG. 10 is a view showing another example of the apparatus according to the fifth embodiment of the present invention. FIG. 10 (a) is a schematic front view, and FIG.
(b) is a schematic plan view. In this example, seven disk-shaped rotary heads 2a, 2b, 2c, 2
d, 2e, 2f, and 2g are provided, all of which are arranged in a zigzag shape along the moving line of the high-temperature steel material 4 by being shifted by at least one unit, and the first head 2a
And the rotation axis of the fifth head 2e is inclined in the same direction as the movement direction B of the high-temperature steel material 4, and the rotation axes of the third head 2c and the seventh head 2g are in the direction opposite to the movement direction B of the high-temperature steel material 4. Inclined, and the second head 2b, the fourth head 2
d and the rotation axis of the sixth head 2 f are perpendicular to the high-temperature steel material 4. Then, each of the rotary heads 2a, 2b, 2
The rotation directions of c, 2d, 2e, 2f, and 2g are opposite to each other.

FIG. 11 is a schematic plan view showing still another example of the device according to the fifth embodiment of the present invention. In this example, the rotary head 2 includes a first head 2a, a second head 2b, and a third head 2c arranged at predetermined intervals on the same line in the width direction of the high-temperature steel material 4; Between the head and the third head 2c, the position is shifted by at least one unit along the movement line of the high-temperature steel material 4,
It comprises a fourth head 2d and a fifth head 2e arranged at predetermined intervals on the same line in the width direction of the high-temperature steel material 4. The rotation directions of the first head 2a, the second head 2b, and the third head 2c and the rotation directions of the fourth head 5d and the fifth head 2e are opposite to each other.

FIG. 12 is a schematic plan view showing still another example of the device according to the fifth embodiment of the present invention. In this example, the rotating head 2 is composed of a first head 2a and a second head 2b arranged at predetermined intervals on the same line in the width direction of the high-temperature steel material 4, and the first head 2a and the second head 2b. A third head 2c and a fourth head 2d, which are arranged at predetermined intervals on the same line in the width direction of the high-temperature steel material 4, with their positions shifted by at least one rearward in the moving direction of the high-temperature steel material 4; A fifth head 2e is provided between the third head 2c and the fourth head 2d, the position of which is shifted by at least one unit along the moving line of the high-temperature steel material 4. Then, the first head 2a and the second head 2b
The rotation directions of the third head 4c, the fourth head 2d, and the fifth head 2e are opposite to each other.

In the above-described apparatus according to each embodiment of the present invention, the type of the nozzle 1 attached to each rotary head 2 is not particularly limited, and a flat spray nozzle, a rod-like nozzle or the like may be appropriately selected. . Also, the number of nozzles 1 is not particularly limited, and may be appropriately selected. Usually, 2 to 8 pieces are suitable.

The most appropriate value may be selected for the distance between the rotary head 2 and the high-temperature steel material 4 according to the flow rate of the nozzle 1 attached to the rotary head 2 and the pressure of the high-pressure water. Usually, a range of about 40 to 200 mm is appropriate.

The number of rotations of the rotary head 2 is set to an appropriate value in relation to the moving speed of the high temperature steel 4. Normally,
It is preferable to set the high-pressure water to be sprayed at least twice at the same position on the high-temperature steel material 4. Further, the injection pressure of the high-pressure water is preferably 100 kg / cm ² or more.
It is more preferable to be at least 00 kg / cm ² .

When the rotation axis of the rotary head 2 is inclined, the inclination angle is preferably in the range of 5 to 30 °. When the inclination angle is less than 5 °, the effect of restricting the direction of the lateral flow water becomes insufficient. On the other hand, when the inclination angle exceeds 30 °,
The descaling effect is extremely reduced.

It is preferable that the difference between the inclination angles of the rotating shafts of two adjacent rotating heads 2 is 10 ° or less.
In this way, by setting the difference in the inclination angle to 10 ° or less, the ratio of the transverse water flowing in each direction is antagonized, and an interference film is formed between the high-pressure water injection regions of two adjacent rotary heads, This prevents the lateral flow water from entering the high-pressure water injection region, and prevents a decrease in the descaling ability in the intermediate region between the two rotary heads. If the difference between the inclination angles exceeds 10 °, such an effect is unlikely to occur.

In the above description of the apparatus according to each embodiment of the present invention, each of the disk-shaped rotary heads 2 to which the plurality of nozzles 1 are attached is disposed above the high-temperature steel material 4. Although the scale on the upper surface of the steel material is removed by high-pressure water injected from 1 to the upper surface of the high-temperature steel material 4, the apparatus according to any of the embodiments includes, for example, the first embodiment of the present invention. As shown in FIG. 13, the disk-shaped rotary heads 2a and 2b
May be disposed below the high-temperature steel material 4, and the scale on the lower surface of the steel material may be removed by high-pressure water 3 sprayed from the nozzle 1 toward the lower surface of the high-temperature steel material 4.
The rotating heads 2a and 2b are arranged above and below the high-temperature steel material 4, and the high-pressure water sprayed from the nozzle 1 toward the upper and lower surfaces of the high-temperature steel material 4 removes both the scales on the upper and lower surfaces of the steel material. Is also good.

[0054]

Next, the present invention will be described in more detail with reference to examples and comparative examples. Example 1 Using the apparatus of the first embodiment of the present invention shown in FIG. 1, two rotating heads arranged on the same line are attached to each head while rotating in the opposite directions under the following conditions. FIG. 18 shows the erosion state of the test plate when high-pressure water is jetted from the flat spray nozzle toward the test plate made of lead plate, and the test plate is reciprocated 5 times at 10 mpm to erode. Table 1 shows a comparison with the erosion state when two rotating heads are rotated in the same direction under the same conditions using the conventional apparatus. The erosion depth of the lead plate test plate was measured with a laser surface roughness meter.

Diameter of rotary head: 250 mm Number of rotations of rotary head: 500 rpm Number of nozzles: 4 Nozzle height: 80 mm Nozzle spray angle (θ): 5 ° High-pressure water amount: 0.4 l / sec High-pressure water Injection pressure: 300 kg / cm ² The evaluation criteria for the erosion state are as follows.

◎: uniform erosion ○: almost uniform erosion △: slight erosion unevenness ×: non-erosion part

[0057]

[Table 1]

As is apparent from Table 1, in the case of the present invention Nos. 1 to 6 in which two rotating heads were rotated in opposite directions, the conventional examples Nos. 7 and 8 in which the two rotating heads were rotated in the same direction. As compared with the case of, the test plate was uniformly eroded, and it was clear that the deskering effect was improved.

Embodiment 2 An apparatus according to a second embodiment of the present invention in which the rotation axes of a plurality of adjacent rotary heads shown in FIGS. 2), high-pressure water was sprayed from a flat spray nozzle attached to each head toward a test plate made of lead plate while rotating each rotating head in the opposite direction to each other. Table 2 compares the erosion state of the test plate when erosion was caused by reciprocating movements with the conventional apparatus shown in FIG. Shown in The test conditions, the erosion depth measurement method, and the erosion depth evaluation standard are the same as those described in Example 1.

[0060]

[Table 2]

As is clear from Table 2, Examples Nos. 1 to 1 of the present invention in which the rotary shafts of the rotary heads were inclined in opposite directions to each other.
In the case of No. 8, the test plate was uniformly eroded, and the deskering effect was clearly improved, as compared with the case of Conventional Example No. 19 in which the rotation axes of the rotary heads were all vertical. Met. In addition, the inclination angle of the rotating head is 30 °.
No. 11 in which the difference between the inclination angles of adjacent rotary heads exceeds 10 ° and N where the tilt angle of the rotary head is less than 5 °
o. 13, No. 16, and No. 15, in which the difference between the inclination angles of the adjacent rotary heads exceeded 10 °, slightly uneven erosion, but did not cause any practical problems.

[Embodiment 3] A device according to a fourth embodiment of the present invention (two rotating heads) shown in FIG. 8 in which a plurality of rotating heads are arranged so as to be shifted from each other is used. While rotating the rotating heads in the same direction or the opposite direction, high-pressure water is sprayed from a flat spray nozzle attached to each head toward a test plate made of a lead plate, and the test plate is reciprocated five times at 10 mpm to break the plate. The erosion state of the test plate when eroded is shown in Table 3 in comparison with the erosion state when using the conventional apparatus shown in FIG. 18 in which the rotating heads are arranged side by side on the same line. The test conditions, the erosion depth measurement method, and the erosion depth evaluation standard are the same as those described in Example 1.

[0063]

[Table 3]

As can be seen from Table 3, Examples Nos. 1 to 4 of the present invention in which the respective rotary heads are arranged with their positions shifted from each other.
In the case of No. 6, the test plate was uniformly eroded, and the deskering effect was improved, as compared with the case of Conventional Examples Nos. 7 to 9 in which the rotating heads were arranged side by side on the same line. Was evident.

Example 4 On the entry side of a rough rolling mill in a hot-rolled steel sheet production line, the rotating shafts of a plurality of adjacent rotary heads shown in FIG. When the apparatus according to the second embodiment of the present invention which rotates in the opposite directions is installed, and high-pressure water is injected at a pressure of 300 kg / cm ² to a high-temperature slab moving at a speed of 1 m / s to perform descaling. The rate of occurrence of scale-like surface flaws and the amount of decrease in slab temperature were examined, and the results were compared using a conventional descaling apparatus with a rotating head provided in the vertical direction and rotating in the same direction as shown in FIG. Examples 1) and FIGS. 14 and 15 show a comparison with the case where a conventional flat spray type descaling device shown in FIG. 16 is used (Comparative Example 2).

As is clear from FIG. 14, the rate of occurrence of scale-like surface flaws in Comparative Example 1 was about 1.3%, and the rate of occurrence of scale-like surface flaws in Comparative Example 2 was about 2.3%. 8%
On the other hand, in the case of the present invention, scale surface flaws hardly occurred.

As is clear from FIG. 15, the slab temperature drop in Comparative Example 1 was about 12 ° C. and the slab temperature drop in Comparative Example 2 was about 50 ° C. The slab temperature drop in the case of the present invention was very small at about 10 ° C.

Embodiment 5 On the entry side of a rough rolling mill in a high-temperature steel sheet production line, a plurality of adjacent rotary heads shown in FIG. 9 are displaced in the moving direction of the high-temperature steel material and opposite to each other. The device according to the fifth embodiment of the present invention, which is arranged to be inclined in the direction of
300 kg / c for a hot slab moving at a speed of 1 m / s
incidence of scale surface flaws when performing injection by descaling the high-pressure water at a pressure of m ² and examined drop of the slab temperature and the results, and the same is provided in the conventional vertical direction shown in FIG. 18 A comparison was made between a case where a descaling device using a rotating head rotating in the direction (Comparative Example 1) and a case where a conventional flat spray type descaling device shown in FIG. 16 was used (Comparative Example 2).

As a result, it is almost the same as FIG. 14 showing the comparison of the occurrence rate of scale-like surface flaws in Example 4 and FIG. 15 showing the comparison of the slab temperature drop amount. Hardly any surface flaws,
The slab temperature drop in the case of the present invention was very small at about 10 ° C.

[0070]

As described above, according to the present invention, a high-temperature steel material such as a high-temperature slab or a steel plate discharged from a heating furnace is attached to a plurality of rotary heads arranged in the width direction. When descaling with high-pressure water jetted from the nozzle, interference of high-pressure water between adjacent rotary heads is prevented, and the descaling can be performed uniformly and efficiently in the width direction, resulting in an industrially useful effect. It is.

[Brief description of the drawings]

FIG. 1 is a view showing an apparatus according to a first embodiment of the present invention. FIG. 1 (a) is a schematic front view, and FIG. 1 (b) is a view showing an apparatus ejected from a nozzle in the apparatus shown in FIG. 1 (a). It is a figure which shows the state after a high pressure water collides with a steel material.

FIG. 2 is a schematic plan view showing a device according to a second embodiment of the present invention.

FIG. 3 is a schematic side view of FIG. 2;

FIG. 4 is a view showing a state after high-pressure water injected from a nozzle collides with a steel material in the device of the second embodiment.

FIG. 5 is a schematic plan view showing a device according to a third embodiment of the present invention.

FIG. 6 is a schematic plan view showing another example of the device according to the third embodiment of the present invention.

FIG. 7 is a schematic plan view showing another example of the device according to the third embodiment of the present invention.

FIG. 8 is a view showing an apparatus according to a fourth embodiment of the present invention. FIG. 8 (a) is a schematic front view, and FIG. 8 (b) is a view after high-pressure water injected from a nozzle collides with a steel material. It is a figure showing a state.

9 is a view showing an apparatus according to a fifth embodiment of the present invention, FIG. 9 (a) is a schematic plan view, and FIG. 9 (b) is a view after high-pressure water injected from a nozzle collides with a steel material. It is a figure showing a state.

FIG. 10 is a view showing another example of the device according to the fifth embodiment of the present invention. FIG. 10 (a) is a schematic front view, and FIG. 10 (b) is a schematic plan view.

FIG. 11 is a schematic plan view showing still another example of the device of the fifth embodiment.

FIG. 12 is a schematic plan view showing still another example of the device of the fifth embodiment.

FIG. 13 is a schematic front view showing an example in which the rotary head is disposed below the steel material and scale on the lower surface of the steel material is removed in the apparatus according to the first embodiment of the present invention.

FIG. 14 is a graph showing the rate of occurrence of scale surface flaws of the present invention and comparative examples.

FIG. 15 is a graph showing slab temperature drop amounts of the present invention example and a comparative example.

FIG. 16 is a diagram showing a nozzle arrangement of a conventional device.

FIG. 17 is an explanatory view of a conventional device using a rotating head.

FIG. 18 is an explanatory diagram of a conventional device using a plurality of rotating heads.

FIG. 19 is a diagram showing a state of lateral flowing water of a conventional apparatus using a plurality of rotating heads.

[Description of Signs] 1: Nozzle 2: Rotating head 3: High-pressure water spray 4: High-temperature steel material 5: High-pressure water injection area 6: Scale peeling area 7: Scale remaining area 8: Lateral flow water 9: Lateral flow water flow direction 10: Interference Film A: Steel material width direction B: Steel material movement direction

Claims (12)

[Claims] A plurality of rotary heads each having a high-pressure water injection nozzle are provided at predetermined intervals toward a steel material to be descaled, and the rotary head is rotated from the nozzle toward the steel material while rotating the rotary head. And inject high pressure water
A descaling device for a steel material for removing scale generated on a surface of the steel material, wherein the rotating directions of the plurality of rotary heads are opposite to each other. 2. A plurality of rotary heads each having a high-pressure water jet nozzle are provided at predetermined intervals toward a steel material to be descaled, and the rotary head is rotated from the nozzle toward the steel material while rotating the rotary head. And inject high pressure water
In the steel descaling device for removing scale generated on the steel material surface, the rotation axes of the plurality of rotating heads are alternately inclined at a predetermined angle in opposite directions along the steel material movement line. A descaling device for steel materials. 3. A plurality of rotary heads each having a high-pressure water jet nozzle are provided at predetermined intervals toward a steel material to be descaled, and the rotary head is rotated from the nozzle toward the steel material while rotating the rotary head. And inject high pressure water
In a steel descaling apparatus for removing scale generated on a surface of a steel material, a rotation axis of each of the plurality of rotating heads is along a movement line of the steel material and is opposite to a movement direction and / or a movement direction thereof. Characterized in that every other unit is inclined at a predetermined angle in the direction of. 4. The apparatus according to claim 2, wherein the rotating directions of the plurality of rotating heads are opposite to each other. 5. The tilt angle of the rotary head whose tilt axis is tilted is in the range of 5 to 30 °.
An apparatus according to any one of the preceding claims. 6. The apparatus according to claim 2, wherein a difference between the tilt angles of adjacent rotary heads whose tilt axes are tilted is 10 ° or less. 7. A plurality of rotary heads each having a high-pressure water injection nozzle are provided at predetermined intervals toward a steel material to be descaled, and the rotary head is rotated from the nozzle toward the steel material while rotating the rotary head. And inject high pressure water
In the steel descaling apparatus for removing scale generated on the steel surface, the plurality of rotary heads are provided along the movement line of the steel material so as to be displaced from each other. A descaling device for steel materials. 8. The apparatus according to claim 7, wherein the rotation directions of the plurality of rotary heads are opposite to each other. 9. The apparatus according to claim 7, wherein the rotation axes of the plurality of rotary heads are alternately inclined at predetermined angles in opposite directions along the movement line of the steel material. 10. A rotating shaft of the plurality of rotary heads is inclined at a predetermined angle every other unit along a moving line of the steel material in a moving direction and / or a direction opposite to the moving direction. An apparatus according to claim 7 or claim 8, wherein 11. The rotating head in which the rotating shaft is inclined has an inclination angle in a range of 5 ° to 30 °.
Or the apparatus according to 10. 12. The apparatus according to claim 9, wherein a difference between the tilt angles of adjacent rotary heads whose tilt axes are tilted is 10 ° or less.