KR20190077758A - Cooling Device and Hot Rolling Equipment - Google Patents

Abstract

The present invention relates to a cooling device for accurately cooling a board and hot rolling equipment having the same. According to an embodiment, the cooling device comprises: a nozzle head configured to partition a plurality of inner spaces along the width direction of a steel plate; a plurality of nozzle members installed in each of the partitioned inner spaces; fluid supply tubes connected to each of the inner spaces of the nozzle head and providing a fluid to the partitioned inner spaces; a masking means disposed in the inner spaces and adjusting an opening degree of a nozzle of the nozzle members; and a driving unit connected to the masking means.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooling device,

The present invention relates to a cooling apparatus for cooling a high temperature plate and a hot rolling equipment including the same.

1 is a schematic view of a hot rolling facility. The plate material supplied from the heating furnace or the continuous casting is passed through the rolling mill 10 and the cooling device 20 and then wound in the winder 30.

The cooling device 20 for cooling the high-temperature plate material uses a method in which cooling water is injected onto the surface of the plate material to perform cooling. In case of rapid cooling of thin sheet material (for example, 12 mm or less), the cooling end temperature must be observed.

Patent Document 1 discloses a technique for controlling the cooling water frequency in order to keep the temperature immediately before winding.

However, in the case of using the conventional cooling apparatus 20, as shown in FIG. 2, some sections may be undercooled and cooled to a temperature lower than the planned temperature, and as a result, the material standard is not achieved in the case of the steel material. This phenomenon is mainly caused by transition boiling, and is a phenomenon in which the cooling efficiency is rapidly increased at any moment when the plate material having a temperature much higher than the boiling point is cooled.

In order to prevent this, a small amount of water should be poured, but if the flow rate is reduced, the water stream becomes narrower than the fixed nozzle size and the shape of the water sprayed becomes irregular. This situation can be confirmed in Fig. When the flow rate is sufficient in the same nozzle, the flow rate is constant as shown in the left photograph of FIG. 3. However, when the flow rate is decreased, the shape of water injected is irregular as shown in the right side of FIG.

Since this type of cooling causes uneven cooling, there is a limitation in that it is difficult to perform accurate cooling because the lower limit of the flow rate that can be injected is determined for each facility.

(Patent Document 1) JP2009-208123 A

An object of the present invention is to provide a cooling device capable of accurately cooling a plate material and a hot rolling equipment including the same.

In order to achieve the above object, the present invention provides the following cooling apparatus and hot rolling equipment including the same.

According to an embodiment of the present invention, there is provided a nozzle head comprising a plurality of inner spaces divided along a width direction of a steel sheet; A nozzle member having a plurality of nozzles arranged in each of a plurality of inner spaces; A fluid supply pipe connected to each of the plurality of inner spaces partitioned by the nozzle head and providing fluid to the partitioned inner space; Masking means disposed in the inner space for adjusting the opening of the nozzle of the nozzle member; And a driving unit connected to the masking unit.

In one embodiment, each nozzle member includes a first nozzle formed on the bottom surface of the nozzle head and a nozzle wall surrounding the nozzle and extending inwardly from the bottom surface into the interior space, And a plurality of extensions connected to the lower end of the body and including a second nozzle having a smaller opening area than the first nozzle.

According to an embodiment of the present invention, the first nozzle and the second nozzle may be selectively applied by the operation of the driving unit.

In one embodiment, the masking means comprises a first plate to which the plurality of extension portions are connected; And a second plate connected to the first plate through the elastic means at an upper portion of the first plate, wherein when the masking means moves to the bottom side by the driving unit, the second nozzle of the extending portion overlaps the first nozzle, The second plate may be configured to block the hollow body of the extension upon further movement.

In one embodiment, the masking means comprises a first plate to which the plurality of extension portions are connected; And a second plate configured to cover the hollow body at an upper portion of the first plate. The driving unit may include first and second cylinders connected to the first and second plates, respectively.

In one embodiment, the masking means includes an elastic member connected to the upper end of the extended portion and a first plate connected to the extended portion through the elastic member, and the second nozzle communicates with the inner space on the side surface of the body A through hole may be formed.

According to an embodiment of the present invention, the nozzle member is composed of a double tube structure including a first tube having a coaxial axis and a second tube disposed inside the first tube, and the first and second Wherein the masking means includes a first plate including a through hole corresponding to the second tube of each nozzle member and a second plate disposed above the first plate and configured to close the through hole can do.

In one embodiment, the first plate may be formed with a flow hole at a position offset from each nozzle member.

The present invention also relates to a rolling mill for rolling a hot material; The cooling device described above; And a coiling machine for winding the rolled material are provided in this order.

The present invention can provide a cooling device capable of adjusting the nozzle opening size to perform cooling of a precise steel sheet.

1 is a schematic view of a hot rolling facility.
2 is a graph showing a temperature change of a plate material with time in a conventional cooling device.
FIG. 3 is a photograph showing the state of the nozzle in accordance with the cooling flow rate.
4a, b are a front view and a partial cutaway view of the cooling device of the present invention.
5 is a cross-sectional view of a first embodiment of a cooling device of the present invention.
6A to 6C are operational state diagrams of the first embodiment of the present invention.
7 is a cross-sectional view of a modification of the first embodiment of the cooling device of the present invention.
8 is a cross-sectional view of another modification of the first embodiment of the cooling device of the present invention.
9A to 9C are partial cross-sectional views of a second embodiment of the cooling apparatus of the present invention.
10A to 10C are partial cross-sectional views of a third embodiment of the cooling apparatus of the present invention.
11A to 11C are partial cross-sectional views of a fourth embodiment of the cooling apparatus of the present invention.
12 is a perspective view of a nozzle member of a fourth embodiment of the cooling device of the present invention.
13A and 13B are graphs showing the temperature of the plate cooled according to the cooling apparatus of the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

FIG. 4A is a front view of one embodiment of the cooling device 100 of the present invention, and FIG. 4B is an exploded view of the cooling device 100 of the present invention.

The cooling device 100 of the present invention can be applied to the hot rolling equipment 1 as shown in Fig. That is, in the cooling device 100 of the present invention, the cooling device 100 is disposed between the rolling mill 10 for rolling a hot plate coming from the heating furnace or the performance facility and the winder 30 for winding the rolled steel sheet .

4A and 4B, the cooling apparatus 100 includes a nozzle head 110 configured to partition a plurality of internal spaces 112 along a width direction of a steel sheet M; A plurality of nozzle members 120 installed in each of the plurality of inner spaces; A fluid supply pipe 170 connected to each of the plurality of inner spaces 112 partitioned by the nozzle head 110 and providing fluid to the partitioned inner space; A masking means (140) disposed in the inner space and regulating the opening of the nozzle of the nozzle member; And a driving unit 190 connected to the masking unit 140. The fluid supply pipe 170 is connected to the partitioned internal space 112 and is connected to the pipe 200 connected to the water supply source to supply the cooling water to the internal space 112.

A plurality of nozzle members 120 are arranged at regular intervals along the width direction and the moving direction of the plate material M and the masking means 140 is disposed in the partitioned inner space 112, Or in the middle of the masking means 140 so as to reduce the resistance by the cooling water in the internal space 112 upon movement of the masking means 140, A flow hole 147 is formed at a position deviated from the flow hole 147. [

5 to 6 show the first embodiment of the present invention in detail. 5 is a cross-sectional view of a first embodiment of a cooling apparatus 100 of the present invention. Figs. 6A to 6C show a state in which the first embodiment of Fig. 5 changes the size of the nozzle opening by the operation of the driving unit 190 Respectively.

5, in the first embodiment of the present invention, the nozzle head 110 is formed by a frame 111, and a plurality of nozzle members 120 are formed in an inner space 112 formed by the nozzle head 110, And a masking means 140 is disposed on the upper portion of the nozzle member 120 so as to cover each nozzle member 120. [ The masking unit 140 is connected to the driving unit 190 and the masking unit 140 is moved up and down by the operation of the driving unit 190.

The nozzle member 120 includes a first nozzle 122 formed on a bottom surface of the nozzle head 110 and a cylindrical nozzle wall 122 surrounding the first nozzle 122 and extending from the bottom surface into the inner space 112 (121). In this embodiment, the first nozzle 122 is formed as an opening having a circular cross section.

The masking unit 140 includes a hollow body 151 extending to the inside of the nozzle wall 121 and an opening having a smaller area than the opening of the first nozzle 122, And the extension 150 is connected to the first plate 142. The first plate 142 includes a first nozzle 142 and a second nozzle 152, The second nozzle 152 and the body 151 are spaced apart from each other when the second nozzle 152 is in close contact with the first nozzle 122, .

On the other hand, a second plate 141 is disposed at a predetermined distance above the first plate 142 to which the extension unit 150 is connected, and the first plate 142 and the second plate 141 are elastically deformed For example by means of a spring 145. The spring 145 is connected by means of an elastic means, The second plate 141 is disposed at a position above the body 151 of the second plate 141 so that the hollow space 153 can be closed when the second plate 141 comes close to the first plate 142. [ A stopper 141a is provided. A flow hole 147 is formed in the first plate 142 and the second plate 141 to reduce the flow resistance when the plate is moved.

The second plate 141 of the masking unit 140 is connected to the first cylinder 191 of the driving unit 190. The first cylinder 191 is provided with a sensor 195 on its side Respectively.

The operation of the first embodiment will be described with reference to FIG.

Fig. 6A shows a state of the first embodiment at the time of normal occasion. The first cylinder 191 is lifted up and the fluid in the inner space 112 is injected through the first nozzle 122.

The low flow rate state of the first embodiment is shown in Fig. 6B. The first cylinder 191 is moved only by the sensor 195 and the first plate 142 and the second plate 141 are moved together by the first cylinder 191. The second nozzle 152 of the extension portion 150 connected to the first plate 142 closely contacts the first nozzle 122 so that the cooling water in the inner space 112 flows through the first plate 142 and the second plate 142, And is injected into the second nozzle 152 through the space between the second nozzle 141 and the hollow 153. As described above, since the opening area of the second nozzle 152 is smaller than that of the first nozzle 122, a constant flow rate can be discharged irregularly when the flow rate is low.

A state in which the cooling device 100 of the first embodiment does not perform cooling is shown. The first cylinder 191 is moved to the end and the stopper 141a of the second plate 141 blocks the hollow 153 so that the cooling water does not flow out into the hollow 153. Accordingly, the first nozzle 122 is blocked by the second nozzle 152 and the cap 141a, so that the cooling water does not flow out.

As described above, the cooling apparatus 100 according to the first embodiment of the present invention can adjust the opening size of the nozzle according to the flow rate, and hence, a constant amount of injection is possible even at a low flow rate. Therefore, it is possible to precisely control the cooling of the plate by stably supplying a small amount of flow in the transition boiling section.

Figs. 7 and 8 show a bottleneck example different from the modification of the first embodiment of Fig. 5 and 5 are the same as those of the nozzle member 120 and the extension 150 in the embodiment of FIGS. 7 and 8 except that the configuration of the first and second plates 141 and 142 and the driving unit 190 This is somewhat different.

7, the first plate 142 is connected to the first cylinder 191, the second plate 141 is connected to the second cylinder 192, and the first plate 142 and the second plate 141 Are not connected to each other. Accordingly, during the low-volume injecting operation, only the first cylinder 191 connected to the first plate operates to adhere the second nozzle 152 to the first nozzle 122, and at the time of stopping, the second cylinder 192 further operates And the hollow 153 is blocked by a cap 141a connected to the second plate 141. [

8, the first and second plates 141 and 142 are connected to the first cylinder 191, but the first plate 142 is connected to the first rod 191a through the second plate 141, Is connected to the second rod 191b. The first cylinder 191 includes a plurality of cylinders and is configured to move the respective rods separately. The first plate 142 is not connected to the second plate 141, and the operation of the rods 191a and 191b determines the low-volume water injector, the normal water injector, and the interruption.

9A to 9C show a second embodiment of the present invention. The shape of the nozzle member 120 in the second embodiment is the same as that in the first embodiment.

The masking means 140 includes an extension portion 150 and the extension portion 150 is connected to a lower end portion of the body 151 and a hollow body 151 extending into the nozzle wall 121, And a second nozzle 152 having an opening smaller than the opening of the first nozzle 122. The extension 150 is connected to the first plate 142 such that the first plate 142 is extended to cover the nozzle wall 121 (see the drawing number 142a). The second nozzle 152 and the body 151 are configured such that the first plate 142 is in close contact with the nozzle wall 121 before the second nozzle 152 is brought into close contact with the first nozzle 122 .

A second plate 141 is disposed at an upper portion of the first plate 142 to which the extension 150 is connected and a sealing layer 144 of rubber is formed on the lower surface of the second plate 141 Respectively. A flow hole 147 is formed in the first plate 142 and the second plate 141 to reduce the flow resistance when the plate is moved. Although not shown, in the case of the second embodiment, the first plate 142 and the second plate 141 may include a driving unit 190 such as the modification of FIG. 7 or the modification of FIG. 8, have.

FIG. 9A shows a state at a normal injection time. 9A, the first plate 142 and the second plate 141 are spaced apart from each other at a regular interval, and a space between the first plate 142 and the second plate 141 and a space between the first plate 142 and the second plate 141, The cooling water in the inner space 112 flows out to the first nozzle 122 through the space between the first plate 142 and the nozzle wall 121. [

FIG. 9B shows the state at low flow rate. As shown in FIG. 9B, the first plate 142 moves downward at a low flow rate, and the first plate 142 and the nozzle wall 121 come into close contact with each other. The cooling water does not flow into the space 123 inside the nozzle wall 121 and the space between the first plate 142 and the second plate 141 and the space between the hollow 153 and the second nozzle 152 Cooling water of a low flow rate is injected and a low flow rate can be stably discharged.

FIG. 9C shows the state when the apparatus is shut down. As shown in FIG. 9C, both the first plate 142 and the second plate 141 are moved downward. A sealing layer 144 under the second plate 141 blocks the hollow 153 and the first plate 142 and the nozzle wall 121 come into close contact with each other to form the first nozzle 122, The cooling water does not flow out to the nozzle 152.

10A to 10C show a third embodiment of the present invention. The shape of the nozzle member 120 in the third embodiment is the same as that in the first embodiment.

The masking means 140 includes an extension portion 150 and the extension portion 150 is connected to a lower end portion of the body 151 and a hollow body 151 extending into the nozzle wall 121, And a second nozzle 152 having an opening smaller than the opening of the first nozzle 122. A plurality of through holes 154 are formed in the body 151 to allow the hollow 153 to communicate with the inner space 112.

The extension 150 is connected to the first plate 142 through the elastic member 160. The first plate 142 is extended to cover the nozzle wall 121 (refer to the drawing number 142a). When the second nozzle 152 is in close contact with the first nozzle 122, the second nozzle 152, the body 151, and the elastic member 160 are positioned between the first plate 142 and the nozzle wall 121 Is formed between the first and second electrodes. The elastic member 160 has a length sufficient to allow the first plate 142 to be in close contact with the nozzle wall 121 when deformed.

On the other hand, a sealing layer 144 made of rubber is attached to the lower surface of the first plate 142. The first plate 142 is provided with a flow hole 147 to reduce the flow resistance when the plate is moved. Although not shown, in the case of the third embodiment, the first plate 142 is configured to be movable in two stages (see FIG. 5) in the same manner as in the first embodiment.

FIG. 10A shows a state at a normal time. 10A, the first plate 142 and the second nozzle 152 are positioned at a distance from the nozzle wall 121 and the first nozzle 122, respectively, and the first plate 142, The cooling water in the inner space 112 flows out to the first nozzle 122 through the space between the first nozzle 122 and the nozzle wall 121.

FIG. 10B shows a state at low flow rate injection. As shown in FIG. 10B, the first plate 142 is moved downward at a low flow rate, so that the first nozzle 122 and the second nozzle 152 come into close contact with each other. Therefore, all of the cooling water flowing into the space between the first plate 142 and the nozzle wall 121 flows out to the second nozzle 152. Since the cooling water having a low flow rate is injected through the second nozzle 152 having a small opening area, a low flow rate can be stably discharged.

Fig. 10C shows the state when the air conditioner is shut down. As shown in FIG. 10C, the first plate 142 is moved so that the first plate 141 is in close contact with the nozzle wall 121. The sealing wall 144 of the lower portion of the first plate 142 closely contacts the nozzle wall 121 so that the cooling water does not flow out to neither the first nozzle 122 nor the second nozzle 152.

Figs. 11A to 11C and Fig. 12 show a fourth embodiment of the present invention.

In the fourth embodiment of the present invention, the nozzle member 120 includes a first nozzle 122 formed on the bottom surface of the nozzle head 110, a second nozzle 122 surrounding the first nozzle 122, A second tube 124 connected to the inside of the first tube via a connection 127 and coaxial with the nozzle wall 121 and a second tube 124 connected to the second tube 124 And a second nozzle 125 connected to a lower portion of the second nozzle 124. In this embodiment, the first nozzle 122 and the second nozzle 125 are formed as openings having concentric circular cross-sections and different in cross-sectional area from each other.

The masking means 140 includes a first plate 142 and a second plate 141 disposed on the upper side of the nozzle member 120 and a sealing layer 144 is attached to the lower portions of the plates 141 and 142 . A flow hole 147 is formed in each plate 141, 142.

The first plate 142 includes a through hole 146 corresponding to the second pipe 124 of each nozzle member 120. When the first plate 142 is in close contact with the nozzle member 120, And the space 123 between the first tube and the second tube is configured to be blocked by the first plate 142.

The second plate 141 is configured to cover the through hole 146 so that when the second plate 141 is in close contact with the first plate 142, And is clogged by the second plate 141.

Although not shown, in the case of the fourth embodiment, the first plate 142 and the second plate 141 may include a driving unit 190 such as the modification of FIG. 7 or the modification of FIG. 8, have.

FIG. 11A shows a state at a normal injection time. 11A, the first plate 142 and the second plate 141 are spaced apart from the nozzle wall 121 and the first plate 142, respectively, and the first plate 142, And the space between the first plate 142 and the second plate 141 and the cooling water in the inner space 112 through the through hole 146 flows out to the first nozzle 122 do.

And Fig. 11B shows a state at the time of low flow rate injection. As shown in FIG. 11B, the first plate 142 descends downwardly at a low flow rate to closely contact the nozzle wall 121 and the upper surface of the second pipe 124. The cooling water does not flow into the space 123 between the first plate 142 and the nozzle wall 121 and the space between the first plate 142 and the second plate 141 and the through holes 146, And then flows out through the hollow 126 to the second nozzle 125. Since the cooling water having a low flow rate is injected through the second nozzle 125 having a small opening area, a low flow rate can be stably discharged.

Fig. 11C shows a state when the apparatus is shut down. As shown in FIG. 11C, the first plate 142 is moved in close contact with the first plate 141. The sealing layer 144 of the lower portion of the second plate 142 closely contacts the through hole 146 of the first plate 141 so that cooling water is supplied to neither the first nozzle 122 nor the second nozzle 152 It does not leak.

According to the flow rate cutoff technique of the present invention, not only the supply of cooling water can be controlled but also a plurality of nozzle members 120 can be shut off at a time or the opening area can be reduced, so that the indicated flow rate profile can be accurately followed. Therefore, there is an effect that the cooling can be controlled so as to minimize the temperature deviation generated in the longitudinal direction or the width direction of the steel sheet. According to the present invention, it is possible to control the flow rate of cooling water to be supplied to the thin plate of the thin plate, thereby minimizing the temperature deviation in the width direction and the longitudinal direction of the steel plate, So that the operation time can be extended. Numerically, it can be expected to increase productivity by 30% when applied to all cooling facilities. Further, the cooling correction rate can be reduced, and the effect of saving the processing cost can be obtained.

Fig. 13 shows a result of carrying out a concrete example of the present invention. The results obtained by casting and cooling the high-temperature plate are shown. FIG. 13A shows the temperature profile of the steel plate when the conventional cooling device is not used, and FIG. 13B shows the temperature profile when the cooling device of the present invention (Example 1) is used.

As shown in FIG. 13A, a temperature deviation of 50 to 60 DEG C occurred in the case of the conventional cooling apparatus, but in the case of using the cooling apparatus of the present invention, the temperature deviation was reduced to 10 to 20 DEG C as shown in FIG. 13B. This indicates that the temperature deviation of the plate material can be controlled through the cooling device held by the injection device and uniform cooling can be realized.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiment, but is to be accorded the widest scope consistent with the appended claims and their equivalents. Should be construed as being included in the scope of the present invention.

100: cooling device 110: nozzle head
112: inner space 120: nozzle member
121: nozzle wall 122: first nozzle
140: masking means 141: second plate
142: first plate 145: spring
150: extension part 151: body
152: second nozzle

Claims (9)

A nozzle head configured such that a plurality of inner spaces are defined along the width direction of the steel sheet;
A nozzle member having a plurality of nozzles arranged in each of a plurality of inner spaces;
A fluid supply pipe connected to each of the plurality of inner spaces partitioned by the nozzle head and providing fluid to the partitioned inner space;
Masking means disposed in the inner space for adjusting the opening of the nozzle of the nozzle member; And
A driving unit connected to the masking unit;
Lt; / RTI >
The method according to claim 1,
Each nozzle member including a first nozzle formed on a bottom surface of the nozzle head and a nozzle wall surrounding the first nozzle and extending inwardly from the bottom surface into the inner space,
Wherein the masking means comprises a plurality of extensions including a hollow body extending into each nozzle wall and a second nozzle connected to a lower end of the body and having a smaller opening area than the first nozzle.
3. The method of claim 2,
And the first nozzle and the second nozzle are selectively applied by the operation of the driving unit.
The method of claim 3,
The masking means
A first plate to which the plurality of extension portions are connected;
And a second plate connected to the first plate through elastic means at an upper portion of the first plate,
Characterized in that the second nozzle of the extension overlaps the first nozzle when the masking means is moved to the bottom side by the drive and the second plate closes the hollow body of the extension when further moving. Cooling device.
The method of claim 3,
The masking means
A first plate to which the plurality of extension portions are connected; And
And a second plate configured to cover the hollow body at an upper portion of the first plate,
Wherein the driving unit includes first and second cylinders connected to the first and second plates, respectively.
The method of claim 3,
The masking means
An elastic member connected to an upper end of the extended portion, and a first plate connected to the extended portion through the elastic member,
And a through hole is formed in a side surface of the body so that the second nozzle communicates with the inner space.
The method according to claim 1,
Wherein the nozzle member has a double pipe structure including a first pipe having a coaxial axis and a second pipe disposed inside the first pipe, wherein first and second nozzles are respectively formed at lower portions of the pipes,
Wherein the masking means comprises a first plate including a through hole corresponding to the second tube of each nozzle member and a second plate disposed on the first plate and configured to close the through hole, Cooling device.
8. The method according to any one of claims 3 to 7,
Wherein the first plate is formed with a flow hole at a position offset from each nozzle member.
Rolling mills for rolling high temperature materials;
A cooling device according to any one of claims 1 to 7; And
And a winder for winding the rolled material are arranged in sequence.

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