KR101070126B1 - Apparatus for Cooling Bar of Mill Line - Google Patents

Abstract

In particular, a rolling line cooling apparatus for cooling a rolling material (bar) that has undergone rough rolling is provided.

The rolling line cooling device is an example of the configuration, the cooling unit is provided to enable the injection of the supplied cooling water; and the cooling unit tilting including the cooling unit is connected to the cooling unit, and provided to enable the tilting of the cooling unit The cooling unit is configured to be capable of cooling the upper surface of the rolled material to be transported and provided on the upper side of the rolling line, at least one upper unit header associated with the cooling unit tilting means, and a predetermined pattern inside the upper unit header. And an upper cooling unit including an immersion nozzle disposed to supply and discharge the cooling water to be discharged, and the cooling unit tilting means is connected to a driving cylinder provided on one side of the material transfer line and disposed on the material transfer line side. A tilting arm connected to a tilting shaft rotatably installed on a bearing block and a cooling unit connected to the tilting arm. It may be configured to include a tilting frame.

According to the present invention, it is disposed on the thick plate rough rolling side to remove the cooling delay of the rolled material through conventional air cooling or descaling to improve the rolling cooling properties, in particular, when the operation of the equipment is stopped or the rough rolled material It is possible to tilt the device at the time of deformation so that the improved effect of facilitating the removal of the bad rolled material or preventing the device from being damaged during use can be obtained.

Hot Rolled, Thick Plate Rough Rolled, Rolled Material Rapid Cooling, Tilting Cooling System

Description

Rolling Line Cooling Equipment {Apparatus for Cooling Bar of Mill Line}

The present invention relates to a rolling line cooling device for cooling a rolled material while being disposed between a rolling line, in particular, a thick plate rough rolling and filament rolling, and more preferably, is disposed on the exit side of the thick plate rough rolling machine, De-scaling eliminates the cooling delay of the rolled material to improve rolling cooling, while in particular, the device can be tilted when the device is idle or when the rolled rolled material is deformed to facilitate removal of the bad rolled material. The present invention relates to a rolling line cooling device which prevents damage to an unused device.

Known rolling lines, in particular thick plate rolling lines, although not shown in a separate drawing, first, the temperature required for rolling operations in a reheating furnace, for example, usually 1100 ~ 1200 ℃ rolling material, that is, thick slab (Slab) Heat it.

Then, the rolled material (slab) subjected to the heating furnace is rolled in about 10 passes or less in the roughing mill (RM), wherein the material thickness is reduced to several tens of mm, and the temperature of the rolled material is lowered to about 1000 ℃ Then, it is transferred to a finishing mill FM.

Meanwhile, the intermediate rolled material that has undergone such rough rolling is referred to as a bar.

However, before and after the pass of the roughing mill, descaling is performed to inject high pressure (150 ~ 200bar) of cooling water onto the steel sheet to remove the scale generated on the bar surface. While passing through a roller table installed between the finishing mills, the material (bar) is cooled by air to lower the temperature.

At this time, a bar cooling device and an accelerated cooling device for cooling a bar that has undergone rough rolling in a thick plate rolling line or a thick plate that has undergone finishing rolling are provided at the exit of the roughing mill RM and the exit of the finishing mill FM, respectively. Is placed.

However, since such a cooling device (equipment) of the rolling line is used to quench the surface of the rolled material (bar or thick plate material) to produce a high toughness and high strength steel sheet, it is necessary to determine the properties of the rolled product in the rolling line. It is an important facility.

For example, FIG. 1 shows a bar cooling device 100 provided at the outlet side of such roughing mill.

That is, as shown in Figure 1, the known rolling line cooling device, that is, the bar cooling device 100 on the exit side of the roughing mill, the upper and lower portions respectively disposed on the upper side and the lower side of the bar transfer table 110 on the exit side of the roughing mill. It includes the cooling unit (130, 140).

Accordingly, the upper cooling unit 130 is provided with a unit header 134 to which a plurality of cooling water supply branch lines 132 'connected to the cooling water main supply line 132 is connected, and inside the unit header 134 Immersion nozzles 136 are disposed and the coolant supplied to the inside of the unit header 134 is injected through the nozzle 136.

In addition, the lower cooling unit 140 has a lower surface of the bar through which the coolant is transferred through the nozzles 144 vertically attached to the outside of the unit header 142 disposed between the rollers 122 of the transfer table 120. It is sprayed, and thus the rolled material, that is, the bar, is cooled through the upper cooling unit 130 and the lower cooling unit 140, and then transferred to the finishing mill FM.

However, as shown in FIG. 1, due to various factors, the temperature irregularity of the bar, in particular, a phenomenon in which the leading end portion of the bar B is bent up or down (material deformation) (this phenomenon is also called a warp. 1) is generated, a bar that passes through the rough mill 110 as shown in FIG. 1 is a problem that the front end of the contact collision with the upper cooling unit 130 in progress.

At this time, the cooling non-uniformity of such a bar is, for example, when the nozzle 136 to which the coolant is injected is clogged by deterioration or foreign matter, the spray of coolant is not uniformly sprayed on the entire bar (material), so that the upper and lower temperature of the bar Non-uniformity occurs.

For example, after the rough rolling process, such as API materials that require low-temperature toughness among heavy plate products, if the temperature of the bar is decreased before finishing rolling or forced cooling to meet the target temperature, the upper and lower rolling conditions and temperature of the bar The difference is that the longitudinal ends or ends of the bars are excessively deformed in the up or down direction, making the transfer of the bars themselves impossible, or crashing the rolling mill and peripherals, causing equipment breakdown.

By the way, in the conventional case, even if the deformation of such a bar is found, the height of the upper cooling unit 130 is limited to about 1500 mm, as shown in FIG.

For example, if the material, that is, the deformation of the bar, the operator must process the deformed bar by cutting the gas, etc. The limited space between the upper cooling unit and the material transfer line as shown in FIG. It was very narrow and therefore the processing time was delayed.

In addition, in the case of the conventional lower cooling unit 140, since the nozzles 144 are separately mounted to the pipe cooling unit header 142 from the outside, when the high temperature material passes without cooling, the nozzle portion This was easily deteriorated and damaged or clogged.

Accordingly, the Applicant of the present invention provides a cooling device in a tilting type to enable at least the tilting of the upper cooling unit, thereby making it possible to handle the material very easily when deformation occurs, and in the case of cooling not required The present invention has been proposed to prevent damage to the cooling unit by moving away from, and to prevent nozzle deformation or clogging by forming a nozzle hole in the upper plate in the case of the lower cooling unit.

The present invention has been proposed in order to solve the conventional problems as described above, the object of the aspect is disposed on the exit side of the thick plate roughing mill to remove the cooling delay of the rolled material through conventional air cooling or descaling to improve the rolling cooling properties In particular, it is possible to provide a rolling line cooling device that facilitates the removal of a defective rolled material or prevents damage to the device during unused operation by allowing the device to be tilted when the operation of the device is stopped or when the rough rolled material is deformed. have.

In addition, another object of the present invention is to provide a rolling line cooling apparatus in which a fixed lower cooling unit is formed by forming a nozzle hole in an upper plate of a unit header to prevent nozzle deformation or clogging.

As a technical aspect for achieving the above object, the present invention, a cooling unit provided to enable the injection of the supplied cooling water; and the cooling unit tilted in conjunction with the cooling unit, provided to enable the tilting of the cooling unit Configured to be tiltable including means,
The cooling unit is provided on the upper side of the rolling line to cool the upper surface of the transported conveyed material, at least one upper unit header associated with the cooling unit tilting means, and arranged and supplied in a predetermined pattern inside the upper unit header It is composed of an upper cooling unit including an immersion nozzle to discharge the cooling water,
The cooling unit tilting means is connected to a driving cylinder provided on one side of the material conveying line, and connected to a tilting arm and a tilting arm connected to a tilting shaft rotatably installed on a bearing block disposed on the material conveying line side and cooling. It provides a rolling line cooling device comprising a tilting frame to which the unit is linked.

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Preferably, further comprising a lower cooling unit provided to cool the lower surface of the rolled material to the lower side of the rolling line.

And, the cooling water supply pipe is connected to both sides of the upper unit header, the center of the upper unit header may further include a central diaphragm arranged to implement a uniform spray of cooling water.

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Preferably, the tilting frame is arranged in pairs, the longer end than the upper unit header while the cooling operation is supported by the front end portion is supported on the opposite side, the plurality of upper unit headers in the connecting frame associated with the tilting frame and the tilting frame And cooling water supply pipes connected to both sides thereof may be fixed and integrally tilted.

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The lower cooling unit includes: a lower unit header disposed between the conveying rollers of the material conveying line and connected to the cooling water supply pipe; And, it may be configured to include a nozzle hole formed in a predetermined pattern on the upper plate provided on the lower unit header.

More preferably, the nozzle hole formed in the upper plate of the lower unit header is formed to be inclined from the center to the outer in the width direction, the cooling water supply pipe is to have a tapered shape in the longitudinal direction of the lower unit header.

According to the present invention, since it is installed close to the exit side of the roughing mill in the rolling line, in particular, the plate rough rolling line, it realizes rapid and uniform cooling of the rolled material, that is, the bar (bar).

Therefore, the temperature of the rolled material (bar) can be easily lowered to facilitate the material temperature control.

In particular, the present invention, when the material cooling is not required at the same time, when the material is bent in accordance with the temperature irregularity when the roughly rolled rolled material rises, if the cooling water injection height is determined, the tilting of the device, in particular the upper cooling unit To make it possible.

Therefore, after rough rolling, it is possible to quickly remove the bad rolled material, which is deformed at the tip, and if the (rapid) cooling is not necessary depending on the material characteristics, the upper cooling unit is lifted in a tilted state. The same damage can be effectively prevented, while the lower cooling unit has a hole in the top plate instead of the existing nozzle, which prevents the breakage of the nozzle portion, thus providing various excellent effects such as extending the life of the device as a whole. will be.

Hereinafter, a preferred embodiment of the present invention according to the accompanying drawings.

First, FIGS. 2 to 6 illustrate a cooling apparatus 1 of the present invention, that is, a cooling apparatus that may be used in a rolling line.

For example, as shown in Figures 2 and 3, the rolling line cooling apparatus 1 of the present invention is arranged in conjunction with the cooling unit and the cooling unit provided to enable the injection of the largely supplied cooling water, It may be configured to include a cooling unit tilting means 30 provided to enable the tilting of the cooling unit.

On the other hand, in the rolling line cooling device (1) of the present invention, the cooling unit is provided on the upper side of the rolling line to be provided to cool the upper surface of the rolling material (see B of Figure 5) to be transferred to the upper cooling unit (10) It may be provided as.

Therefore, the apparatus of the present invention, the lower cooling unit 50 (disposed between the rollers 122 of the transfer table 120 of Figure 1) provided to cool the lower surface of the rolled material to the lower side of the rolling line (Fig. 9) It can be provided as a rolling material, that is, a bar cooling device disposed on the exit line (see FIG. 1) of the rolling line, in particular, the plate roughing mill (see 110 of FIG. 1), and in this embodiment, It will be described as a rough bar bar cooler.

By the way, the cooling device 1 of this invention is arrange | positioned actually closer to the rough rolling side between rough rolling mill (110 of FIG. 1) and a finishing mill.

Therefore, the cooling device 1 of the present invention, of the upper and lower cooling unit 10, 50, in particular, when the deformed bar (B) occurs, it is possible to easily process the upper cooling unit 10 of the There is an exemplary feature of what makes tilting possible.

In addition, the upper cooling unit 10 is provided to the upper side of the rolling material, that is, the bar provided on the upper side of the rolling line and transferred through the transfer roller of the transfer table, and is provided on the lower side of the lower side of the rolling line. Naturally, 50 is provided to cool the lower surface of the bar, and the upper cooling unit 10 may also be used for cooling equipment when the material does not pass, as described in detail below.

On the other hand, Figures 2, 4 and 7a, b shows the upper cooling unit 10 of the rolling line cooling device 1 according to the present invention, the upper cooling unit 10 of the present invention, One or more upper unit headers 12 associated with the tilting means 30 to be described in detail below, and an immersion nozzle 14 for discharging and spraying the cooling water disposed and supplied in a predetermined pattern inside the upper unit header 12. ).

That is, in the present invention, the upper cooling unit 10 has nozzles installed in the cooling header of the pipe shape, and the cooling water is not injected through the cooling header, but the cooling water is supplied to the inner space of the upper unit header 12 of the rectangular box shape. A portion is stored, and the coolant is dropped and sprayed while the coolant overflows through the immersion nozzle 14 installed therein as shown in FIGS. 4 and 7A, and the upper surface of the rolled material that is transferred from the lower side, that is, the cooling Will be.

Therefore, the cooling unit having the immersion nozzle as described above cools the unit header and the immersion nozzle so that the cooling water stored therein does not damage the equipment from the heat transmitted as the material passes.

2 to 4, the coolant supply pipe 20 is vertically connected in the longitudinal direction of the upper unit header 12, and the supply pipe is connected to the main pipe 22. The same pipes may be arranged in conjunction with the tilting frame 34 of the tilting means 30 which will be described in detail below.

Therefore, as shown in FIG. 4, when the coolant injection is not necessary according to the property of the material, when the coolant stored in the upper unit header 12 is not enough to overflow through the immersion nozzle 14, the heat of the immersion nozzle Since the damage occurs, the cooling water supply pipe 20 supplies a small amount of cooling water to the inside of the upper unit header 12, and a small amount of cooling water flows through the immersion nozzle little by little, thereby preventing thermal damage of the immersion nozzle. It becomes possible.

The cover plate 12a is assembled to the upper portion of the upper unit header, and the cooling water supply pipe 20 is connected in a flange shape in accordance with a hole formed therein, and the cooling water supply pipe is in the longitudinal direction of the upper unit header. Multiple pieces may be connected vertically at equal intervals.

At this time, as shown in Figures 2, 3 and 5, the main cooling water supply pipe 16 is connected to both sides of the upper unit header 12 of the rectangular box form.

The main cooling water supply pipe 16 is larger in diameter than the cooling water supply pipe above, and the connector 16a is flanged to connect the side wall of the upper unit header to the main cooling water supply pipe.

Therefore, in the case of actual cooling, referring to FIG. 1, since the coolant continuously overflows the inner immersion nozzle and is dropped into the upper surface of the raw material, a considerable amount of coolant must be supplied.

That is, as illustrated in FIG. 7A, a lot of immersion nozzles are arranged in one upper unit header 12.

At this time, preferably, as shown in Figure 7b, in the center of the upper unit header 12 is to install a central diaphragm 18 arranged to implement a uniform spray of cooling water.

That is, since the cooling water is supplied from the main cooling water supply pipe at both sides of the long rectangular box-shaped upper unit header 12, in the central portion of the elongated unit header, the supply pipe cooling water may collide to generate vortices. In particular, make sure that the coolant is not evenly sprayed in the longitudinal direction of the unit header.

Therefore, since the center diaphragm blocks the center even when the coolant is supplied to both sides, the center diaphragm serves to uniformize the amount of coolant sprayed in the longitudinal direction of the upper unit header.

In other words, if the distribution of the coolant injection amount is not constant, a temperature nonuniformity of the material, i.e., the bar, is generated, which causes deformation of the rolled material extracted after rough rolling of the bar (for example, a warping phenomenon of bending up and down). The uniform distribution of cooling water is important.

Next, FIG. 2, FIG. 3 and FIG. 6 show the tilting means 30 of the apparatus of the present invention which enables the tilting of the actual upper cooling unit 10 in the rolling line cooling apparatus 1 according to the present invention. .

That is, the tilting means 30 of the present invention is connected to the driving cylinder 32 provided on one side of the material conveying line, the tilting shaft rotatably installed in the bearing block 36 disposed on the material conveying line side And a tilting arm 38 connected to 40 and a tilting frame 34 connected to the tilting arm 38 and to which the upper cooling unit is linked.

Therefore, as shown in FIGS. 2, 3 and 6, when the driving cylinder 32 of the tilting means 30 is advanced, the tilting arm 38 connected to the cylinder rod 32a and the pin 37 is The tilting shaft 40 supported by two pairs of bearing blocks 36 on both sides is rotated about an axis, and thus the tilting frame 34 connected to the upper portion of the upper cooling unit 10 in FIG. Is tilted.

At this time, as shown in Figures 2 and 3, the elongated tilting frame 34 is a pair is arranged, while extending longer than the upper unit header 12, the front end is supported by the opposite side support 42 during cooling operation.

And, as shown in Figure 3, a plurality of upper unit headers in the connecting frame 44 of the vertical plate form connected via the connecting frame 45 fixed to the lower portion of the tilting frame 34 and the tilting frame (34) 12) and cooling water supply pipes 16 connected to both sides thereof are fixed and tilted integrally.

Therefore, in the apparatus of the present invention, when rolling a bar (B), which is a roughly rolled material in a thick plate rolling line, and cooling it, the driving cylinder 32 of the tilting means 30 moves backward, thereby tilting the frame. 34 performs cooling in a state where the tip is placed on the support 42 in a horizontal state (not lifted by its own weight).

In addition, since the upper cooling unit 10 is tilted when the driving cylinder 32 is advanced, the apparatus of the present invention causes deformation of the rolled material, that is, the bar B, as shown in FIG. In the case of collision interference with other installations, it is possible to easily make room for removal.

In addition, when cooling is not necessary according to the rolled material, when the upper cooling unit 10 is lifted up in a tilted state, it also provides another advantage of preventing damage to the device due to the passage of high temperature material. will be.

At this time, as shown in Figure 2, the hole 70a formed in the connecting plate 70 provided on one side of the tilting frame 34 and the device base structure (unsigned) disposed in the position where the tilting frame is tilted A fixing pin (not shown) is inserted into the hole 72a formed in the connecting plate 72 of the holder 72, so that when the cooling is not performed, the upper cooling unit 10 is lifted up to the holder 72 in a lifted state. It is fixed.

Next, FIGS. 8 to 10 show the lower cooling unit 50 of the rolling line cooling device 1 according to the present invention.

That is, such a lower cooling unit 50 together with the upper cooling unit 10 included in the rolling line cooling apparatus 1, as shown in FIGS. 1 and 9, between the conveying rollers 122 of the conveying table 120. It is arranged to cool the rolled material, that is, the lower surface of the roughly rolled bar.

The lower cooling unit 50 of the present invention is disposed between the feed rollers of the material transfer line, the lower unit header 52 to which the cooling water supply pipe 54 is connected, and the lower unit header 52 as described above. It characterized in that it comprises a nozzle hole 58 penetrated in a predetermined pattern on the top plate 56 provided at the top of the.

At this time, the lower unit header 52, as shown in Figure 10, the lower header 52a to which the branch pipes 54a of the coolant supply pipe 54 are connected to the lower portion and the upper header 52b to be widened to an upper portion thereof. Are combined, and an upper plate 56 having nozzle holes 58 formed on the upper header is assembled.

Therefore, in the case of the present invention, since the nozzle holes 58 are formed on the upper plate 56 having a thickness, unlike the existing lower nozzles in the simple pipe, heat loss of the nozzle holes is prevented, and Less deformation and less unevenness caused by blockage during cooling water injection.

In particular, as shown in FIG. 10, the nozzle hole 58 formed on the upper plate is composed of a lower end portion 58a having a wider diameter and an upper end portion 58a having a smaller diameter to increase the cooling water spraying force, thereby cooling water is injected at a high pressure.

In particular, since the nozzle port 580 is formed to be inclined toward the outside from the center in the width direction of the unit header, the nozzle port 580 does not overlap in the cooling water injection direction, thereby minimizing the injection force and foreign matter penetration.

As a result, the lower cooling unit 50 of the cooling device 1 of the present invention has a longer lifespan of the cooling unit and a uniform spray of cooling water as compared to the existing nozzle, so that the lower surface of the cooling unit 1 has excellent cooling property.

In particular, as shown in Figures 9 and 10, the cooling water supply pipe 54 connected to the unit header 52 of the lower cooling unit 50 of the present invention, the branch pipes (54a) in sequence along the longitudinal direction of the unit header It is connected but has a tapered shape that decreases in diameter toward the end.

Therefore, since the diameter of the supply pipe decreases toward the end of the lower unit header 52 as the supplied cooling water increases, the cooling water supply pressure increases, and the distribution of the cooling water injected through the lower cooling unit as a whole is determined in the longitudinal direction of the unit, that is, the material ( It is kept uniform in the width direction of the bar).

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 is a schematic diagram schematically showing a damage state of a facility due to a deformed rolled material after rough rolling of a conventional thick plate

2 is a block diagram showing a cooling apparatus including an upper cooling unit and a tilting means of the rolling line cooling apparatus according to the present invention.

3 is a plan view of FIG.

Figure 4 is a structural diagram showing a unit header of the upper cooling unit of the present invention

Figure 5 is a schematic plan view of the upper cooling unit of the present invention installed in two

6 is a main view illustrating a tilting driving cylinder of the upper cooling unit of FIG.

7A and 7B are a bottom view and an inner diaphragm structure diagram showing a unit header of the upper unit of the present invention.

Figure 8 is a block diagram showing a lower cooling unit of the cooling device according to the present invention

9 is a top view of FIG. 8

FIG. 10 is a detailed view illustrating a unit header and a nozzle hole of the lower cooling unit of FIG. 8.

Explanation of symbols on the main parts of the drawings

1 .... rolling line cooling system 10 .... upper cooling unit

12 .... Upper unit header 14 .... Immersion nozzle

16,54 .... coolant supply pipe 18 .... central diaphragm

30 .... Tilting means 32 .... Drive cylinder

34 .. Tilting frame 36 .... Bearing block

38 .... tilting arm 40 .... tilting axis

42 .. Support 44 .... Connecting frame

50 .... Lower Cooling Unit 52 .... Lower Unit Header

56 .... Top plate 58 .... Nozzle opening

Claims (9)

A cooling unit provided to enable injection of the supplied cooling water; and a cooling unit tilting means associated with the cooling unit and provided to enable tilting of the cooling unit. The cooling unit is provided on the upper side of the rolling line to cool the upper surface of the transported conveyed material, at least one upper unit header associated with the cooling unit tilting means, and arranged and supplied in a predetermined pattern inside the upper unit header It is composed of an upper cooling unit including an immersion nozzle to discharge the cooling water, The cooling unit tilting means is connected to a driving cylinder provided on one side of the material conveying line, and connected to a tilting arm and a tilting arm connected to a tilting shaft rotatably installed on a bearing block disposed on the material conveying line side and cooling. Rolling line cooling device comprising a tilting frame to which the unit is linked. The method of claim 1, And a lower cooling unit provided to cool the lower surface of the rolled material toward the lower side of the rolling line. delete The method of claim 1, Cooling water supply pipe is connected to both sides of the upper unit header, the upper cooling unit further comprises a central diaphragm disposed in the center of the upper unit header. delete The method of claim 1, The tilting frame is arranged in pairs at intervals, the length is longer than the unit header of the upper cooling unit, the front end is supported on the opposite support during cooling operation, And a cooling water supply pipe connected to the upper unit header and both sides of the tilting frame and the connection frame connected to the tilting frame. The method of claim 2, The lower cooling unit, the lower unit header is disposed between the transfer roller of the material transfer line, the cooling water supply pipe is connected; And, A nozzle hole penetrated in a predetermined pattern on an upper plate provided on an upper portion of the lower unit header; Rolling line cooling device comprising a. The method of claim 7, wherein The nozzle hole formed in the upper plate of the lower unit header is formed to be inclined from the center to the outside in the width direction, The cooling water supply pipe, the rolling line cooling device formed in the tapered form in the longitudinal direction of the lower unit header. The method according to any one of claims 1 to 2, 4 and 6 to 8, Rolling line cooling device disposed on the outlet side of the thick plate roughing mill.

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