KR20120087616A - Apparatus for preventing scale from accumulating around rolling mill - Google Patents

Abstract

PURPOSE: A scale accumulation preventing device of a rolling mill is provided to prevent scale accumulation because an upper flat surface of a lower stripper of a rolling mill where scale is accumulated is reduced or removed. CONSTITUTION: A scale accumulation preventing device of a rolling mill comprises a flushing nozzle unit(110), a nozzle angle adjusting unit(120), and a control unit(130). The flushing nozzle unit is installed in an upper stripper(100b) of a rolling mill and sprays cleaning water to remove scale existing on the upper part of a lower stripper(100a) of the rolling mill. The nozzle angle adjusting unit adjusts the spraying angle of the flushing nozzle unit. The control unit controls the pressure of the cleaning water and the spraying angle of the flushing nozzle unit.

Description

Rolling mill scale prevention device {APPARATUS FOR PREVENTING SCALE FROM ACCUMULATING AROUND ROLLING MILL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing the accumulation of rolling mill scales. In particular, the side scale peeled off during rolling of the steel sheet is accumulated and left in the lower stripper of the rolling roll, and then flows between the rolling rolls to effectively cause a surface defect of the steel sheet. It is a technique regarding the rolling mill scale accumulation prevention apparatus which can be prevented.

Since a large amount of scale is generated on the surface of the slab extracted from the furnace, a descaling operation is performed to remove such scale.

In addition, the scale on the slab surface generated by oxidation during movement to the rolling mill, as well as the scale not removed at this time, is being removed by further descaling operations performed at the rolling mill inlet side.

However, the scale of the residual amount generated from the side of the slab rather than the surface is not properly removed and is likely to remain.

An object of the present invention is to provide a rolling mill scale accumulation prevention device that can prevent the phenomenon that the side scale peeled during the rolling of the steel sheet accumulates in the lower roll stripper roll, causing a surface defect of the steel sheet flowing between the rolling rolls. .

According to the idea of the present invention, a flushing nozzle unit which is provided in the upper roll roll stripper (splushing) for spraying the washing water to remove the scale existing on the upper portion of the lower roll roll stripper; It provides a rolling mill scale accumulation prevention device comprising a; nozzle angle adjusting unit for adjusting the spray angle of the flushing nozzle unit.

At this time, the control unit for controlling the injection angle of the flushing nozzle unit and the water pressure of the washing water sprayed through the flushing nozzle unit;

In addition, the nozzle angle control unit, the drive shaft is connected to the flushing nozzle unit, it is preferable that the servo motor or stepping motor whose rotation angle is controlled according to the command applied from the controller.

In addition, the washing water storage tank for storing the washing water sprayed through the flushing nozzle unit; may further include.

And a pressure control valve disposed on a flow path connecting between the wash water storage tank and the flushing nozzle unit to adjust the water pressure of the wash water sprayed through the flushing nozzle unit according to a command applied from the controller. Do.

On the other hand, according to another aspect of the present invention, a flushing nozzle unit which is provided in the upper roll stripper (rolling roll) for spraying the washing water to remove the scale existing on the upper portion of the lower roll roll stripper, and the flushing nozzle It includes a nozzle angle adjusting unit for adjusting the injection angle of the negative, wherein the upper structure of the lower roll roll strip, the rolling mill scale accumulation prevention device, characterized in that the flat surface is reduced or eliminated to prevent the accumulation of scale do.

At this time, it is preferable that the upper structure of the rolling roll lower stripper has a widthwise cross-sectional shape which is formed to be inclined downward in the outward direction and at the outer end an arc-shaped curved portion is formed.

In addition, the upper structure of the lower roll roll stripper, it is preferable that the triangular irregularities of a predetermined size are continuously provided along the longitudinal direction, it has a shape that excludes the flat surface to accumulate the scale.

In addition, the upper structure of the rolling roll lower stripper is preferably provided with a trapezoidal irregularities of a predetermined size along the longitudinal direction, and has a shape in which the flat surface on which scale is accumulated is reduced.

According to the rolling mill scale accumulation device of the present invention, by providing an angle adjustment function to the flushing nozzle provided in the upper roll roll stripper to remove the scale existing on the upper strip roll lower stripper more easily, it is possible to prevent the accumulation of scale It has a beneficial effect.

In addition, according to the rolling mill scale accumulation prevention device of the present invention, according to the design change of the upper structure of the rolling roll lower stripper in the form of reducing or eliminating the flat surface on which the scale can accumulate, the beneficial effect of preventing the accumulation of scale in advance There is.

1 is a view schematically showing a rolling roll lower stripper structure,
2 is a view showing a state in which the scale is peeled off during one pass rolling to accumulate on the lower stripper,
3 is a view showing a state that the scale flows between the rolling rolls in accordance with the deflection of the steel sheet tip,
4 is a view showing the scale introduced into the rolling roll is pressed under the steel sheet causing surface defects,
5 is a view schematically showing a rolling mill scale preventing device according to a first embodiment of the present invention,
6 is a view schematically showing a rolling mill scale preventing device according to a second embodiment of the present invention;
FIG. 7 shows a first modification of the lower stripper superstructure in the second embodiment shown in FIG. 6;
8 is a view showing a second modification of the lower stripper superstructure in the second embodiment shown in FIG.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

However, the present invention is not limited by the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments merely make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.

Prior to describing the rolling mill scale accumulation preventing device according to an embodiment of the present invention, with reference to FIGS. 1 to 4 will be described with respect to the action of the rolling roll lower stripper structure and the scale pressed into between the rolling rolls to reduce the surface quality of the steel sheet Let's look at it.

During the transfer from the furnace to the rolling mill scales are produced on the surface and sides of the steel sheet for a variety of reasons.

The scale generated in this way deteriorates product quality, so each process uses a device called a descaler to perform descaling.

However, not the scale generated on the surface of the steel sheet, the scale of the residual amount generated from the side is often not effectively removed by the action of such a descaler, the phenomena remaining until the inlet to the rolling mill due to this reason.

As shown in FIG. 1, the rolling mill is provided with a cover called a stripper 10 on the upper and lower parts to protect the rolling roll from the lower deflection or deformation of the steel sheet being rolled.

However, in the upper structure of the lower stripper 10a, as the flat region 12 is formed in a relatively wide range, there is a high possibility that the scale may be accumulated and accumulated.

Referring to Figure 2, it can be seen that the scale (C) generated from the steel sheet (S) entered into the one pass rolling roll is seated on the flat portion 12 of the rolling strip lower stripper (10a) to accumulate.

3, the scale C accumulated on the flat portion 12 of the lower stripper 10a flows into the rolling roll R due to the lower deflection of the steel sheet S tip. You can check it.

Next, referring to FIG. 4, the scale C introduced into the rolling roll R in FIG. 3 is press-fitted between the rolling roll R and the steel sheet S during the rolling process of the steel sheet S. Referring to FIG. can confirm.

Since the press-fitted scale may cause the quality of the steel sheet to deteriorate, the present invention was devised as a way to effectively remove scales that may accumulate on the upper stripper lower stripper.

5 is a view schematically showing a rolling mill scale accumulation prevention apparatus according to a first embodiment of the present invention, Figure 6 is a view schematically showing a rolling mill scale accumulation prevention apparatus according to a second embodiment of the present invention.

5 and 6 clearly illustrate only the main features in order to conceptually clearly understand the present invention, and as a result, various modifications of the drawings are expected, and the scope of the present invention is limited by the specific shapes shown through the drawings. There is no need to be limited.

First Embodiment

Referring to FIG. 5, the first embodiment of the rolling mill scale accumulation preventing device illustrated includes a flushing nozzle unit 110 for removing the scale C existing on the upper part of the rolling roll lower stripper 100a, and such a flushing. It includes a nozzle angle adjuster 120 for adjusting the spray angle of the nozzle portion.

First, the flushing nozzle unit 110 will be described.

The flushing nozzle part 110 plays a role of removing the scale which exists in the upper part of the rolling roll lower stripper 100a by the water washing action.

To this end, the flushing nozzle unit 110 is preferably made of a form and structure capable of spraying the high pressure washing water toward the upper portion of the lower roll stripper (100a).

As a preferred arrangement, the flushing nozzle unit 110 may be provided in the rolling roll upper stripper 100b as shown in FIG. 5. In addition, the water discharge portion to which the washing water is sprayed may be disposed facing the upper side of the rolling roll lower stripper (100a).

And here, the washing water may be used in a variety of liquids capable of high pressure injection, there is no need to limit the range. It is also possible to use commonly available water as a form of preferred washing water.

In particular, the configuration of the flushing nozzle unit 110 in the present invention has a unique function that the injection angle can be adjusted. To this end, the nozzle angle adjusting unit 120 may be included.

Next, the nozzle angle adjusting unit 120 will be described.

As briefly mentioned above, the nozzle angle adjusting unit 120 serves to adjust the spray angle of the flushing nozzle unit 110.

To this end, the nozzle angle adjusting unit 120 may have a form in which a drive shaft is connected to the flushing nozzle unit 110, and the rotation of the flushing nozzle unit 110 by a rotational driving force generated by an external power source. Configured to adjust the angle.

Specific examples corresponding to the nozzle angle adjuster 120 may correspond to an AC / DC servo motor whose rotation angle is controlled by a command of the controller 130 to be described later.

In this case, as an example of the nozzle angle adjusting unit that can be used as a simple device configuration according to various embodiments, a stepping motor that takes a step motion by a predetermined rotation angle may be used.

The flushing nozzle unit 110 and the nozzle angle adjusting unit 120 may be controlled in a manner in which a worker gives a command using a remote switch, but in order to better user convenience, a separate control unit 130 It may further include.

As described above, the controller 130 controls the nozzle angle adjusting unit 120 to adjust and control the spray angle of the flushing nozzle unit 110 as the user intends. In addition, the controller 130 also plays a role in controlling the water pressure of the washing water sprayed through the flushing nozzle unit 110.

In the rolling mill scale accumulation prevention apparatus according to the first embodiment of the present invention, in addition to the above-described configuration of the flushing nozzle unit 110, the nozzle angle adjusting unit 120 and the control unit 130, the washing water storage tank 140, Pressure control valve 150 may be further provided.

The washing water storage tank 140 means a container-type means for storing and storing the washing water sprayed through the flushing nozzle unit 110.

The wash water reservoir 140 may take the form of being connected to one side of the rolling roll upper stripper 100b. On the other hand, as a form provided separately to the outside of the rolling mill, it may be made in the form connected to the flushing nozzle unit 110 and the pipe line.

However, in order to prevent a phenomenon in which the supply amount of the washing water is depleted during the rolling process, it is desirable to secure an internal accommodation space that can be stored in a relatively large amount compared to the amount used.

A pressure control valve 150 may be provided on a pipe line connecting between the wash water storage tank 140 and the flushing nozzle unit 110, that is, the flow path through which the wash water flows.

The pressure control valve 150 plays a role of controlling the injection pressure of the washing water sprayed onto the rolling roll lower stripper 100a through the flushing nozzle unit 110.

The pressure regulating valve 150 may be made by the control unit 130 described above. In another embodiment, the pressure regulating valve 150 may be controlled by a water pressure input directly from a user by a remote switch.

When the pressure control valve 150 is controlled by the control unit 130 is an action form as follows.

The size and shape of the scale obtained from various image sensors, for example, a laser vision sensor, are transmitted to the controller 130.

The controller 130 analyzes the size and shape of the scale obtained from the sensor and calculates and calculates the injection water pressure of the washing water required to effectively remove the scale.

As such, the injection water pressure of the washing water calculated by the controller 130 is converted into an electrical signal form, and then applied to the pressure control valve 150, thereby flushing the nozzle unit 110 with the injection water pressure suitable for the size and shape of the scale. The washing water is sprayed through.

Second Embodiment

FIG. 6 is a view schematically showing a rolling mill scale preventing device according to a second embodiment of the present invention.

This second embodiment of the present invention includes all of the above-described configuration of the first embodiment of the present invention, and additionally has a structural feature in which the upper structure of the rolling roll lower stripper is designed and modified. Therefore, a description of the duplicated configuration of the first embodiment of the present invention described above with reference to FIG. 5 will be omitted.

Referring to FIG. 6, a second embodiment of the rolling mill scale accumulation preventing device illustrated includes a flushing nozzle unit 110 for spraying washing water to remove the scale of the rolling roll lower stripper, and a nozzle for adjusting the spray angle of the flushing nozzle unit. It includes an angle adjusting unit 120. And it may also include a control unit 130 for adjusting the injection angle and the washing water pressure of the flushing nozzle unit 110.

Meanwhile, according to the second embodiment of the present invention, the upper structure of the rolling roll lower stripper 100a has a unique shape as shown.

That is, in the second embodiment of the present invention, the upper structure of the rolling roll lower stripper 100a has a shape in which the flat surface is reduced or excluded to prevent accumulation of scale.

Referring to Figure 6, it is possible to check the cross-sectional shape of the width direction of the upper structure of the rolling roll lower stripper.

As shown, the cross-sectional shape in the width direction of the upper structure of the rolling roll lower stripper (100a), it can be confirmed that the curved shape 114 of the arc-shaped at the outer end is formed inclined downward 113 in the outward direction. .

The cross-sectional shape in the width direction of the lower roll roll lower stripper is a structure that guides the scale that is seated on the upper portion of the lower roll roll lower stripper to slide downward and effectively prevents accumulation of scale.

Here, the inclination angle in the section formed to be inclined downward in the outward direction does not need to be limited, and may be changed little by little in accordance with various embodiments.

In addition, the radius of curvature of the arc-shaped curved portion 114 formed at the outer end is not necessarily limited to a specific size, and may be changed little by little in accordance with various embodiments.

The design change of the upper structure of the rolling roll lower stripper 100a is to induce the scale to fall out of the rolling roll lower stripper 100a so as to prevent accumulation of scale.

Therefore, although not shown separately, in order to prevent the phenomenon that the surroundings of the rolling mill due to the scale dropped to the outside of the rolling roll lower stripper (100a), it may be further provided with a scale collector mounted horizontally in the falling range.

Furthermore, another embodiment of this rolling roll lower stripper superstructure can be seen through FIGS. 7 and 8.

7 and 8 are the design changes in the longitudinal direction to prevent the accumulation of scale on the upper roll roll lower stripper (100a), respectively.

In particular, it consists of a unique structure for reducing and eliminating the upper flat surface of the rolling roll lower stripper which is the area | region where the scale accumulates intensively.

Referring to FIG. 7, in the upper structure of the rolling roll lower stripper, a shape in which triangular irregularities 112 ′ of a predetermined size are continuously provided along the length direction may be confirmed.

As a result, it can be seen that the flat surface, which is an area where scale can be accumulated, is excluded.

In addition, referring to Figure 8, in the upper structure of the rolling roll lower stripper, it can be confirmed that the shape is continuously provided with a trapezoidal irregularities 112 ″ of a predetermined size along the longitudinal direction.

As a result, it can be seen that the upper flat surface, which is an area where scales can be accumulated, is reduced.

Here, the upper structure of the rolling roll lower stripper described with reference to FIGS. 6 to 8 may be performed separately, but may be used mixed with each other.

As described above, the scale has a rolling roll lower stripper upper structure which cannot be accumulated, and at the same time, even if accumulated, the scale can be completely removed by spraying the washing water by the flushing nozzle unit and the nozzle angle adjusting unit.

As described above, according to the rolling mill scale accumulation prevention device of the present invention, by applying the angle adjustment function to the flushing nozzle provided on the upper roll roll stripper to remove the scale existing on the upper roll roll lower stripper more easily, Can be effectively prevented.

In addition, according to the rolling mill scale accumulation prevention device of the present invention, according to the design change of the upper structure of the rolling roll lower stripper in the form of reducing or eliminating the flat surface that the scale can accumulate, the accumulation of scale can be blocked in advance, when rolling It is possible to prevent the phenomenon that the surface quality of the steel sheet is degraded due to the indentation of the scale.

In the above, the preferred embodiment regarding the rolling mill scale accumulation prevention apparatus which concerns on this invention was described.

It is to be understood that the above-described embodiments are illustrative in all aspects and should not be construed as limiting, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

100a: rolling roll lower stripper
100b: rolling roll upper stripper
110: flushing nozzle
120: nozzle angle adjustment unit
130:
140: wash water reservoir
150: pressure regulating valve

Claims (9)

A flushing nozzle unit provided in the upper roll roll stripper to flush the washing water to remove the scale present on the upper portion of the lower roll roll stripper; And
Rolling mill scale prevention device comprising a; nozzle angle adjusting unit for adjusting the spray angle of the flushing nozzle unit.
The method of claim 1,
And a control unit for controlling the spray angle of the flushing nozzle unit and the water pressure of the washing water sprayed through the flushing nozzle unit.
The method of claim 2,
The nozzle angle adjustment unit,
The driving shaft is connected to the flushing nozzle unit, rolling mill scale prevention device, characterized in that the servo motor or stepping motor whose rotation angle is controlled in accordance with the command applied from the controller.
The method of claim 2,
Rolling mill scale prevention device further comprises a; washing water storage tank for storing the washing water sprayed through the flushing nozzle unit.
The method of claim 4, wherein
And a pressure regulating valve disposed on a flow path connecting between the wash water storage tank and the flushing nozzle unit to adjust the water pressure of the washing water sprayed through the flushing nozzle unit according to a command applied from the control unit. Rolling mill scale prevention device.
A flushing nozzle part provided in the upper roll roll stripper to flush the washing water to remove the scale existing on the upper strip roll lower stripper, and a nozzle angle adjusting unit for adjusting the spray angle of the flushing nozzle part; ,
The upper structure of the rolling roll lower stripper is a rolling mill scale accumulation preventing device, characterized in that the flat surface is reduced or eliminated to prevent the accumulation of scale.
The method according to claim 6,
The upper structure of the rolling roll lower stripper,
Rolling machine scale accumulation prevention device characterized in that it has a cross-sectional shape in the width direction which is formed inclined downward in the outward direction and at the outer end an arc-shaped curved portion is formed.
The method according to claim 6,
The upper structure of the rolling roll lower stripper,
Rolling machine scale accumulation preventing device characterized in that the triangular irregularities of a predetermined size are continuously provided along the longitudinal direction, so that the flat surface on which the scale is accumulated is excluded.
The method according to claim 6,
The upper structure of the rolling roll lower stripper,
Rolling machine scale accumulation preventing device, characterized in that the trapezoidal irregularities of a predetermined size are continuously provided along the longitudinal direction, the flat surface on which the scale is accumulated has a reduced shape.

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