KR101845235B1 - Apparatus and method for spraying cooling water - Google Patents

Abstract

A sheet supply apparatus and method capable of preventing the occurrence of surface defects of a steel sheet by feeding wafers from which moisture and wrinkles and foreign matter have been removed to a surface of a steel sheet wound in a coil form.
The cooling water injection device according to an embodiment of the present invention includes a driving unit that rotates the screw shaft and a cooling water injection unit that linearly moves along the longitudinal direction of the screw shaft in association with the rotation of the screw shaft and injects the cooling water toward the high temperature steel.
According to another aspect of the present invention, there is provided a method of injecting cooling water, the method comprising: receiving a width of a steel material; moving a spray nozzle to a predetermined position after selecting a position of the spray nozzle according to a size of the steel material; And spraying the cooling water using a spray nozzle toward the steel material.

Description

[0001] APPARATUS AND METHOD FOR SPRAYING COOLING WATER [0002]

The present invention relates to a cooling water spraying apparatus and method, and more particularly, to a cooling water spraying apparatus and method capable of uniformly spraying cooling water as the position of a spray nozzle can be adjusted corresponding to the width of a steel material.

In order to cool the surface of a slab (hereinafter referred to as "steel") produced in the casting process, cooling water mixed with atomized water or air is sprayed onto the surface of the steel during continuous casting by a spray nozzle do.

Since the steels cast in the casting process can have various width sizes, in order to achieve a uniform cooling effect on the steel, a structure in which the position of the spray nozzle is adjusted according to the width of the steel is required.

Conventionally, in order to uniformly spray the cooling water onto the surface of the steel material, a form in which the spray nozzle and its driving device are positioned opposite to each other vertically above the steel material conveyed along the performance equipment is used. A structure in which a pair of spray nozzles, which receive and move the power to both sides of the driving device, inject cooling water toward the surface of the steel plate is used.

However, in this case, the position of the driving device of the spray nozzle is directly exposed to the hot and humid operating environment, and it is a cause of the frequent failure of the driving device due to deterioration. In the case of serious problem, .

The present invention provides a cooling water spraying apparatus and method capable of variably controlling the position of a spray nozzle in accordance with the width of various steel materials in a performance process.

The present invention provides a cooling water spraying apparatus and method capable of improving the durability of facilities by avoiding the position of a driving unit of a spray nozzle from a high temperature and high humidity operating environment.

The present invention provides a cooling water spraying apparatus and method that can simplify the mechanical structure required for adjusting the position of a spray nozzle, thereby facilitating the maintenance and repair of equipment.

According to an embodiment of the present invention, And a cooling water spraying device that linearly moves along the longitudinal direction of the screw shaft in association with the rotation of the screw shaft and injects cooling water toward the steel material.

The cooling water injecting means includes a nut holder which is linearly moved along the outer circumferential surface of the screw shaft in conjunction with rotation of the screw shaft and a spray nozzle which is supported by the nut holder and receives cooling water from the cooling water supply means and injects cooling water toward the steel material .

At this time, the nut holder may be in the form of a closed container capable of temporarily storing the cooling water supplied from the cooling water supply means through the accommodating space provided therein.

And an inlet of the spray nozzle is connected through a side opening of the nut holder, and an outlet of the spray nozzle is installed to face the steel material.

The inlet of the spray nozzle is directly connected to the cooling water supply means, and is attached and fixed to a side surface of the nut holder. The outlet of the spray nozzle can be installed to face the steel material.

The cooling water spraying unit may further include a cooling water receiving chamber connected between the nut holder and the spray nozzle and temporarily storing the cooling water before the cooling water flows toward the spray nozzle.

Here, the cooling water accommodating chamber may store cooling water introduced from the cooling water supplying means through an internal hollow formed in the longitudinal direction, and a plurality of spray nozzles may be connected to the internal hollow through the predetermined interval.

The cooling water supply means may include a cooling water storage tank for storing cooling water and a cooling water supply line connected to the spray nozzle from the cooling water storage tank.

In addition, the cooling water supply means may include a cooling water supply pump for flowing the cooling water along the cooling water supply line, and a cooling water supply valve for controlling the flow of the cooling water flowing along the cooling water supply line.

Preferably, the driving unit is an electric motor that is spaced upward from the high-temperature steel conveyed from the lower portion and is installed on the wall frame so as not to face the high-temperature steel.

Meanwhile, the cooling water injection device according to an embodiment of the present invention controls the output of the electric motor in accordance with the width of the high-temperature steel material by receiving a command from the user in real time or receiving a command according to the execution of the pre- The control unit may further include a control unit.

According to an embodiment of the present invention, there is also provided a method of manufacturing a steel sheet, comprising the steps of: (a) receiving a width size of a steel material; (b) moving the spray nozzle to the predetermined position after the position of the spray nozzle is selected according to the size of the input steel material; And (c) spraying cooling water with the spray nozzle toward the steel material; And a cooling water spraying method.

The step (b) includes the steps of: (b-1) calculating the number of revolutions and the direction of rotation of the screw shaft necessary to move the spray nozzle to the predetermined position; And (b-2) moving the spray nozzle by rotating the screw shaft according to the calculated information.

In the step (b-1), the number of revolutions of the screw shaft is calculated based on a pitch value of the screw shaft, based on a lead value of the spray nozzle during one rotation of the screw shaft .

According to the embodiment of the present invention, the position of the spray nozzle can be variably controlled corresponding to the width size of various steel materials, thereby realizing a uniform cooling effect on the high-temperature steel.

Particularly, in consideration of the fact that the operating environment becomes hot and humid when the cooling water is sprayed on the high-temperature steel material in the performance process, by adopting the structure in which the position of the driving part of the spray nozzle is avoided, the driving part due to deterioration is prevented from being damaged or damaged .

In addition, since the drive mechanism between the spray nozzle and the drive unit is realized by a lead screw method, facility maintenance can be facilitated and the position accuracy of the spray nozzle can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a cooling water injection device according to an embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooling water injection device.
3 is an enlarged view showing an enlarged view of a first example of the cooling water spraying means of the cooling water spraying apparatus according to the embodiment of the present invention.
4 is an enlarged view of a second example of the cooling water spraying means of the cooling water spraying device according to the embodiment of the present invention.
5 is an enlarged view of an enlarged view of a third example of the cooling water spraying means of the cooling water spraying apparatus according to the embodiment of the present invention.
FIG. 6 is an enlarged sectional view of a section PP 'of FIG. 3 and FIG. 4 is an enlarged sectional view of a section of QQ' of FIG. 4;
Fig. 7 is a partial cross-sectional view of an enlarged view of an inlet connection portion of the spray nozzle structure in the cooling water spraying means of Fig. 3;
8 is a flowchart sequentially showing a method of injecting cooling water according to an embodiment of the present invention.
FIG. 9 is a flowchart showing the detailed steps of the spray nozzle moving step (ST200) in FIG.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor shall appropriately define the concept of the term in order to describe its invention in the best way It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

Hereinafter, a cooling water spraying apparatus and method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram briefly showing a cooling water injection device according to an embodiment of the present invention; FIG.

1, the illustrated cooling water injector 100 includes a driving unit 110 for rotating a screw shaft 120, a driving unit 110 for moving linearly along a longitudinal direction of the screw in conjunction with rotation of the screw shaft 120, And a cooling water spraying means 130 for spraying the cooling water W while being adjusted.

As shown in FIG. 1, a high-temperature steel material is disposed under the cooling water injector 100 according to the embodiment of the present invention.

The steel material here can be a slab produced in particular during the playing process. The slabs produced in the casting process are sprayed with atomized water or cooling water mixed with air to the surface during continuous casting in order to be subjected to surface cooling treatment. However, even in this case, the cooling water W is uniformly sprayed on the entire surface of the slabs S, S1 and S2 having different width sizes . The cooling water spraying apparatus 100 according to the embodiment of the present invention is capable of adjusting the position of a spray nozzle for spraying cooling water on the surface of the slab in response to a variation in width of the slab, It is obvious.

The driving unit 110 is a transmission device that rotates the screw shaft 120. That is, the driving unit 110 is configured by an electric motor M that receives a power supplied from the outside to generate a rotational force, and the screw shaft 120 is connected to the driving shaft to rotate the screw shaft 120.

Particularly, such a driving unit 110 may cause high temperature heat due to the characteristics of the electric motor M, and may cause functional damage or failure in the moisture. As a result, the driving unit 110 may be moved away from the slab S So as to be less influenced by heat or moisture.

To this end, the driving unit 110 in the embodiment of the present invention is disposed so as to be spaced upward from the high-temperature slab S conveyed from below. The driving unit 110 is mounted on the wall frame 200 so as not to face the slab S. 1, the driving unit 110 according to the embodiment of the present invention is mounted on the inclined side face of the wall frame 200 to form a slab S, as well as a thermal effect due to the slab S, Is less likely to be affected by the moisture generated due to moisture evaporation of the cooling water (W) upon cooling the surface of the cooling water (W).

The screw shaft 120 is rotatably installed on the driving shaft of the driving unit 110 and is disposed such that a pair of screw shafts 120 disposed on both sides are collected toward the slab S on the lower side. And rotates clockwise or counterclockwise in accordance with rotation of the driving unit 110. [

The cooling water injecting means 130 is configured to move linearly along the longitudinal direction of the screw shaft 120 in conjunction with the rotation of the screw shaft 120 and to inject the cooling water W toward the high temperature slab S,

Particularly, it is possible to adjust the position of the cooling water injecting means 130 with respect to various slabs S, S1, and S2 having widths L1, L2, and L3, W) uniformly.

The cooling water injecting means 130 includes a nut holder 140 that linearly moves along the outer circumferential surface of the screw shaft 120 and cooling water which is supported by the nut holder 140 and is introduced from the cooling water supply means 170 into the slab S of the spray nozzle 150.

The nut holder 140 is engaged with the screw shaft 120 and moves linearly in the longitudinal direction of the screw shaft 120 as the screw shaft 120 rotates. That is, the screw shaft 120 and the nut holder 140 have a driving mechanism of a lead screw. The driving mechanism of the lead screw is not limited to a nut holder having a lead distance determined according to the pitch interval of the screw thread provided on the outer periphery of the screw shaft 120 when the screw shaft 120 makes one rotation, (140) moves. The nut holder 140 linearly moves forward or backward along the rotating direction of the screw shaft 120.

As shown in FIG. 1, the nut holder 140 mounted on the outer circumferential surface of the screw shaft 120 interlocks with the clockwise or counterclockwise rotation of the screw shaft 120, .

That is, the position of the nut holder 140 is initially set to the lower end so that the cooling water can be uniformly sprayed onto the slab S having the width of L1. However, in the slab S1 having the width of L2, The position of the nut holder 140 'can be adjusted by relatively moving upward.

The spray nozzle 150 is supported by the nut holder 140 and injects the cooling water supplied from the cooling water supply means 170 toward the slab S on the lower side. Referring to FIG. 1, it can be seen that the spray nozzle 150 is supported and connected to the side surface of the nut holder 140. As shown, the inlet of the spray nozzle 150 is connected to the side of the spray nozzle 150, and its outlet is installed to face the slab S to inject cooling water toward the slab S on the lower side.

In addition, the cooling water injection device according to the embodiment of the present invention may further include a configuration of the control unit 190. The control unit 190 controls the output of the electric motor serving as the driving unit 110, It is possible to control the flow of the cooling water supplied through the heat exchanger 170. That is, the control unit 190 is provided with a configuration of the motor control unit 191 for applying the control signal C1 to adjust the output of the electric motor as the driving unit 110 and a configuration of the control signal C2 for controlling the cooling water supply unit 170, And a cooling water supply control unit 193 for applying a cooling water supply control signal. However, the control signals (C1, C2) applied from the respective control structures (191, 193) are merely preferred examples, and the present invention is not limited to such a signal flow.

According to the configuration of the control unit 190, a command is inputted according to the real-time command input from the user or execution of the pre-stored program, and the output of the driving unit 110, The direction of rotation is controlled. In addition, the cooling water supply flow and the pressure intensity can be controlled and controlled.

The detailed configuration of the cooling water supply means 170 can be confirmed with reference to FIG.

The cooling water supply means 170 includes a cooling water storage tank 171 for storing cooling water and a cooling water supply line 171 for piping from the cooling water storage tank 171 to the spray nozzle 150 to provide a supply path for the cooling water 173).

The cooling water supply means 170 may include a cooling water supply pump 175 that provides the pressure necessary to draw the cooling water from the cooling water reservoir 171 and to flow the cooling water through the cooling water supply line 173 . And a cooling water supply valve 177 for opening and closing the flow of cooling water flowing along the cooling water supply line 173. The configuration of the cooling water supply pump 175 and the cooling water supply valve 177 can be controlled by the control signal C2 applied from the cooling water supply control unit 193 of the control unit 190 described above.

3 is an enlarged view of a first example of the cooling water spraying means of the cooling water spraying apparatus according to the embodiment of the present invention.

3, the illustrated coolant spray means 130 has a structure in which a receiving space 144 having a predetermined internal volume is provided in a nut holder 140 mounted on a screw shaft 120, The cooling water supplied from the cooling water supply means 170 can be temporarily stored. Accordingly, an external housing 142 that hermetically seals the front surface of the accommodation space 144 is provided, and has a hollow internal volume that is as large as the accommodation space 144.

Particularly, an enlarged section corresponding to the section P-P 'in FIG. 3 can be confirmed through FIG. 6 (a). 6 (a), a nut fastening surface 121 with a screw shaft 120 is formed at the center of the end surface of the nut holder 140, and cooling water is provided between the outer side of the nut holder 140 and the external housing 142 A receiving space 144 that can be stored is provided.

Referring to FIG. 3 again, a first example of the cooling water jetting means 130 includes a cooling water supply line 173 through a nut holder 140 having a housing space therein, The spray nozzle 150 is connected through the side surface.

Here, the structure in which the spray nozzle 150 is connected can be confirmed with reference to FIG. 7, a receiving space 144 is provided therein, and a side opening 146 is further formed in the nut holder 140, which is hermetically sealed by the outer housing 142. As shown in FIG. And the inlet 151a of the spray nozzle 150 is connected and connected through the side opening 146 of the nut holder 140. [ The hermetic member 153 may be further inserted between the inlet 151a of the spray nozzle 150 and the side opening 146 of the nut holder 140 for blocking the leakage.

According to this structure, as shown in FIG. 3, the cooling water injecting means 130 is supplied with cooling water from the cooling water supply means 170 to the inner accommodating space 144 of the nut holder 140. The cooling water W stored in the nut holder 140 can be injected through the inlet 151a of the spray nozzle 150 to the slab S on the lower side through the outlet 151b.

Next, Fig. 4 is an enlarged view of a second example of the cooling water spraying means in the cooling water spraying apparatus according to the embodiment of the present invention.

4, an inlet 151a of the spray nozzle 150 is directly connected to a cooling water supply line 173, and an inlet portion of the spray nozzle 150 is connected to the nut holder 150 (140) and fixed in position. To this end, a bracket 152 for fixing the spray nozzle 150 to the side surface of the nut holder 140 and a fastening means 152a may be further provided. The outlet 151b of the spray nozzle 150 is disposed to spray the cooling water W toward the lower slab S as shown in FIG.

In particular, an enlarged section corresponding to the section QQ 'of FIG. 4 can be confirmed through FIG. 6 (b). 6 (b), a screw engagement surface 121 with the screw shaft 120 is formed at the center of the end surface of the nut holder 140, and the outer surface of the nut holder 140 is filled with the end surface of the nut holder 140 . That is, the shape of the nut holder 140 is different from the shape in which the receiving space 144 is provided in the nut holder 140 in FIG. 5 (a). Here, the shape of the two different nut holders has been described separately for convenience, but it is also possible to slightly differently implement the nut holder according to various embodiments.

Next, Fig. 5 is an enlarged view of a third example of the cooling water spraying means of the cooling water spraying apparatus according to the embodiment of the present invention. Referring to FIG. 5, the illustrated coolant spray means 130 further includes a coolant receiving chamber 155 between the nut holder and the spray nozzle.

The cooling water accommodating chamber 155 is configured to receive the cooling water W from the cooling water supply means 170 and to store the predetermined amount of cooling water before the cooling water W flows into the spray nozzle.

5, the cooling water supply line 173 communicates with the cooling water accommodating chamber 155 and the cooling water accommodating chamber 155 communicates with the plurality of spray nozzles 150a, 150b and 150c .

Particularly, the cooling water accommodating chamber 155 is provided with an inner hollow 155a formed therein in the longitudinal direction, and is effective for uniformly injecting cooling water through each of the plurality of spray nozzles 150a, 150b, and 150c. The plurality of spray nozzles 150a, 150b, and 150c may communicate with the inner hollow 155a and be connected to each other at predetermined intervals along the longitudinal direction of the cooling water accommodating chamber 155. As shown in Fig. 5, the cooling water spraying means is disposed above the slab S moving downward by the driving of the rollers. Particularly, a plurality of spray nozzles 150a, 150b and 150c connected to the cooling water accommodating chamber 155 are arranged one by one from the upper side of the rollers toward the surface of the slab S in the vertical direction. And each spray nozzle injects cooling water toward the surface of the slab S without interfering with the roller driving at the top of the slab S. [ According to this structure, the plurality of spray nozzles 150a, 150b, and 150c are simultaneously displaced with respect to the linear movement of the nut holder, and the positions thereof are simultaneously adjusted.

However, the shape and structure of the cooling water accommodating chamber 155 shown in FIG. 5 are shown as a rectangular box body having a longer transverse length than the longitudinal direction for convenience of explanation. The number of the spray nozzles 150a, 150b and 150c connected to the cooling water accommodating chamber 155 is also limited to three. However, the number of spray nozzles 150a, 150b, and 150c, as well as the shape of the illustrated coolant receiving chamber 155, is only a preferred exemplary shape and does not limit the present invention.

As described above, according to the cooling water spraying apparatus according to the embodiment of the present invention, a uniform cooling effect of a high-temperature steel material, particularly a slab in a performance process, can be realized. Even when the width size of the slab is changed The position of the spray nozzle can be adjusted and the cooling facility can be operated more actively.

FIG. 8 is a flow chart sequentially showing a method of spraying cooling water according to an embodiment of the present invention, and FIG. 9 is a flowchart showing detailed steps of a spray nozzle moving step (ST200) in FIG.

Hereinafter, the cooling water spraying method according to the present embodiment will be described with reference to FIGS.

The width size input step (ST100)

In this step ST100, the width size of the steel material is inputted. The steel material at this stage may be a slab produced in particular during the playing process. Slabs produced in the casting process are sprayed with cooling water mixed with atomized water or air to the surface during the continuous casting in order to be subjected to the surface cooling treatment.

However, in the case of the slabs S, S1 and S2 in which the surface cooling is required, the slabs may have various widths L1, L2 and L3 as shown in FIG. ) Is preferably uniformly sprayed over the entire surface. For this reason, it is required to preliminarily receive the width size of the slab.

Spray nozzle moving step (ST200)

In this step ST200, the position of the spray nozzle is moved.

Particularly, when the width size of the slab is inputted through the previous step (ST100), the position of the spray nozzle can be selected and the spray nozzle is moved on the predetermined position.

This step ST200 may include the detailed steps ST210 and ST230 shown in FIG. 9. First, the rotational speed and the rotational direction of the screw shaft necessary for moving the spray nozzle to the predetermined position are calculated (ST210). The calculation of the number of revolutions and the direction of rotation of the screw shaft in this step ST210 may vary depending on the pitch value of the screw shaft. When the screw shaft makes one revolution, Can be calculated. Next, in accordance with the information calculated in the previous step ST210, the screw shaft is rotated to move the spray nozzle onto the predetermined position (ST230).

Cooling water injection step (ST200)

In this step ST300, the cooling water is uniformly sprayed toward the entire width of the slab by using the spray nozzle moved to the predetermined position. As a result, a uniform cooling effect of the slab can be realized in the performance process.

In the meantime, in the case of the cooling water spraying apparatus and method according to the embodiment of the present invention, the cooling water is sprayed on the slab by using the slab in the performance process as an example. However, none.

In other words, it may be used as a cooling water spraying apparatus and method for various members whose width size may be varied not only for a steel material requiring surface cooling but also for other materials.

As described above, according to the cooling water spraying apparatus and method of the present invention, the position of the spray nozzle can be variably controlled corresponding to the width of various steel materials, and a uniform cooling effect on the high-temperature steel material can be realized.

Particularly, in consideration of the fact that the operating environment becomes hot and humid when the cooling water is sprayed on the high-temperature steel material in the performance process, by adopting the structure in which the position of the driving part of the spray nozzle is avoided, the driving part due to deterioration is prevented from being damaged or damaged .

In the case of the cooling water spraying apparatus of the present invention, the power transmission mechanism between the spray nozzle for spraying the cooling water onto the surface of the steel material and the driving unit for enabling the position adjustment of the spray nozzle is realized by the lead screw method.

Particularly, since the adjustment of the position of the spray nozzle is made possible by the screw-type shaft rotating through the driving part and the nut-type holder which is reciprocated forward and backward by the screw-type shaft, a relatively simple structure is applied, . In addition, when the screw shaft makes one revolution, the nut type holder can be controlled to be moved forward and backward by one pitch of the screw shaft, and the positional accuracy of the spray nozzle connected to the nut type holder can be improved.

The cooling water spraying apparatus and method according to the present invention have been described with reference to preferred embodiments.

It is to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention will be indicated by the appended claims rather than by the foregoing detailed description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

S, S1, S2: Slab W: Coolant
100: Cooling water injection device
110:
120: screw shaft
130: Cooling water injection means
140: nut holder
142: external housing 144: accommodation space
150: Spray nozzle
151a: Spray nozzle inlet 151b: Spray nozzle outlet
153:
170: Cooling water supply means
171: Cooling water reservoir 173: Cooling water supply line
175: Cooling water supply pump 177: Cooling water supply valve
190:
191: Motor control unit 193: Cooling water supply control unit

Claims (14)

A driving unit for rotating the screw shaft; And
And cooling water jetting means for linearly moving along the longitudinal direction of the screw shaft in association with rotation of the screw shaft and jetting cooling water toward the steel material,
A nut holder linearly moving along an outer peripheral surface of the screw shaft in association with rotation of the screw shaft;
And a spray nozzle which is supported by the nut holder and which receives cooling water from the cooling water supply means and injects cooling water toward the steel material.
delete The method according to claim 1,
Wherein the nut holder has a shape of a closed container capable of temporarily storing the cooling water supplied from the cooling water supply means through a receiving space provided therein.
The method of claim 3,
Wherein an inlet of the spray nozzle is connected through a side opening of the nut holder, and an outlet of the spray nozzle is installed to face the steel material.
The method according to claim 1,
Wherein an inlet of the spray nozzle is directly connected to the cooling water supply means, and is attached and fixed to a side surface of the nut holder, and an outlet of the spray nozzle is installed to face the steel material.
The method according to claim 1,
The cooling water jetting means,
And a cooling water accommodating chamber connected between the nut holder and the spray nozzle for temporarily storing the cooling water before the cooling water flows toward the spray nozzle.
The method of claim 6,
The cooling water accommodating chamber includes:
Wherein the cooling water introduced from the cooling water supply means is stored through an inner hollow formed in the longitudinal direction and a plurality of spray nozzles are connected to the inner hollow through the predetermined gap.
The method according to claim 1,
The cooling water supply means
A cooling water storage tank for storing cooling water,
And a cooling water supply line connected to the spray nozzle from the cooling water reservoir.
The method of claim 8,
The cooling water supply means
A cooling water supply pump for flowing cooling water along the cooling water supply line,
And a cooling water supply valve for opening and closing the flow of cooling water flowing along the cooling water supply line.
The method according to claim 1,
Wherein the driving unit is an electric motor that is spaced upward from the high temperature steel material conveyed from the lower portion and is installed on the wall frame so as not to face the high temperature steel material.
The method of claim 10,
Further comprising a control unit for receiving a command from a user in real time or receiving a command according to the execution of a pre-stored program and controlling the output of the electric motor in accordance with the width of the high-temperature steel material.
(a) receiving a width size of a steel material;
(b) moving the spray nozzle to the predetermined position after the position of the spray nozzle is selected according to the size of the input steel material; And
(c) spraying cooling water onto the steel material using the spray nozzle; Lt; / RTI >
The step (b)
(b-1) calculating a rotation number and a rotation direction of the screw shaft necessary to move the spray nozzle to the predetermined position; And
(b-2) rotating the screw shaft according to the calculated information to move the spray nozzle .
delete The method of claim 12,
In the step (b-1), the number of revolutions of the screw shaft is
And calculating a pitch of the screw shaft based on a lead value of the spray nozzle during one rotation of the screw shaft.

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