KR200243122Y1 - Roll Coolant Injector of Hot Rolling Mill - Google Patents

Abstract

The present invention relates to a device for injecting cooling water during the hot rolling process, and more particularly, the spraying operation according to the cooling water injection control is rapid to increase the cooling effect of the roll, and to prevent the drop of temperature to the surface of the rolled material to prevent the temperature decrease. The present invention relates to a roll cooling water spraying device of a hot rolling mill, which is improved to appropriately adjust the cooling water spraying range according to the width of the rolled material.

The present invention has upper and lower holes respectively coupled to the fixed nipple and injection nozzles on the upper and lower surfaces of the hexahedron adapter, and a horizontal hole into which the cylindrical poppet seat is inserted is provided on one side of the adapter. The rear end of the poppet is fixed to the rear movable piston is coupled to the cylinder in contact with the rear of the poppet seat, the rear end of the cylinder is fixed to the spring to support the piston to the front to seal the inner hole, air An injection unit having a cap having a connector; and a first, third, fifth, and seventh narrow electromagnetic valve for controlling the first, third, fifth, and seventh narrow air lines respectively connected to cylinders of a plurality of adapters mounted in the narrow section of the header. The 2nd, 4th, 6th and 8th wide electron sides, respectively, which are connected to the calculator, respectively, and the 2nd, 4th, 6th and 8th wide lines connected to the cylinders of a plurality of adapters installed in the wide section, respectively. On the other hand, it provides a roll cooling water injector for a hot rolling mill including; a control unit having a front and rear sensors for detecting the front and rear ends of the rolled material.

Description

Roll Coolant Injector of Hot Rolling Mill

The present invention relates to a device for injecting cooling water during the hot rolling process, and more particularly, the spraying operation according to the cooling water injection control is rapid to increase the cooling effect of the roll, and to prevent the drop of temperature to the surface of the rolled material to prevent the temperature decrease. The present invention relates to a roll cooling water spraying device of a hot rolling mill, which is improved to appropriately adjust the cooling water spraying range according to the width of the rolled material.

In general, as shown in FIG. 1, the hot rolling facility 100 of a steel mill is provided with upper and lower backup rolls 11 and 12 and upper and lower work rolls 21 and 22 in a vertical slab structure. To pass the rolled material such as the upper and lower work rolls 12, 22 again a number of times in the forward and reverse directions to produce a rolled steel sheet having a certain thickness, length.

Meanwhile, the upper and lower work rolls 12 and 22 should be cooled by spraying cooling water during the rolling process. In the conventional spraying method, the control valve 7 installed in the basement as shown in the cab 9 When on by manual operation with a switch, cooling water is provided in a plurality of headers (2a) installed at the front and the front of the rolls (12) and (22) in the advancing direction of the rolled material (3). And (2b), (2c) and (2d), respectively, and then sprayed through to cool the roll surface.

However, since the distance between each of the heads 2a, 2b, 2c, and 2d to which the coolant is injected and the control valve 7 which is opened and closed is very far from each other, rapid cooling water injection is difficult. While reducing the cooling effect, there was a problem that the sprayed from the header (2a), (2b), (2c), (2d) regardless of the material and width of the rolled material (3). In addition, during the rolling of special steel such as stainless steel 300 series and 400 series, cooling water injection and blocking are repeatedly performed to maintain an appropriate temperature of the rolled material 3, wherein the headers 2a, 2b, 2c, The distance between 2d and the control valve 7 is so great that the coolant in the coolant line 6 does not cool the rolls 12 and 22 immediately after the coolant is shut off, and falls to the top of the rolled material 3 to reduce the temperature. There was a problem of lowering the quality by lowering.

When the coolant in the coolant line 6 falls down immediately after the coolant is shut off and discharged to the outside, the inside of the pipe is left empty, so that the coolant line that is empty when the coolant is supplied again by the operation of the control valve 7 6) It generates a hammering action in the interior. At this time, each part constituting the cooling water line 6, the flange gasket, the fixing clamp, the connecting pipe, etc. are damaged or relaxed, requiring repeated maintenance work. There is a problem of reducing the service life of the facility by promoting early deterioration of the cooling water line.

Therefore, the present invention has been devised to solve the problems described above, the purpose of which is the rapid injection response of the cooling water injected from the plurality of headers to improve the cooling efficiency, preventing the fall of the cooling water after the shut-off operation It is always present at a constant pressure in all the cooling water lines to prevent the water hammer which occurred during re-injection to extend the service life of the equipment, and to adjust the cooling water spray width to narrow width and wide width according to the width size of the rolled material. In addition, it is possible to save the amount of cooling water used, and to provide a hot rolled water spraying device of hot rolling mill capable of producing high quality hot rolled products by enabling separate injection of cooling water during rolling of special steel.

1 is a perspective view showing a roll cooling water injection device of a rolling mill according to the prior art,

Figure 2 is a longitudinal cross-sectional view showing the operating state of the injection unit employed in the roll cooling water injector of the hot rolling mill according to the present invention,

3 is an exploded perspective view showing an injection unit employed in the roll cooling water injector of the hot rolling mill according to the present invention,

Figure 4 is a longitudinal cross-sectional view showing the spraying unit employed in the roll cooling water injector of the hot rolling mill according to the present invention,

5 is a perspective view showing a roll cooling water injection device of a hot rolling mill according to the present invention;

Figure 6 is a plan view showing a roll cooling water injection device of a hot rolling mill according to the present invention.

<Description of Symbols for Major Parts of Drawings>

1 ..... Roll Coolant Injector 2a, 2b, 2c, 2d ..... Header

3 ...... Rolled material 6 ..... Coolant line

200 .... Injection part 201 .... Fixed nipple

202 .... Injection nozzle 210 .... Adapter

211 .... Upper hole 212 .... Lower hole

213 .... Horizontal Ball 214 .... Poppet Sheet

220 .... Cylinder 222 .... Cylinder

223 .... poppet 227 .... spring

300 .... control unit 301,302 .... front and rear sensors

311,313,315,317 ... Narrow Air Lines 321,323,325,327 ... Narrow Electron Valves

312,314,316,318 ... Wide Air Lines 322,324,326,328 ... Wide Electron Valves

400 .... Calculator X, Y ..... Narrow, wide section

In order to achieve the above object, the present invention, the upper and lower backup roll and the upper and lower work rolls in the upper and lower structure, in the hot rolling facility having a plurality of headers supplied with cooling water through the cooling water line, The upper and lower holes of the hexahedron adapter have upper and lower holes respectively coupled to the fixed nipples assembled in the fixing holes of the header and the spray nozzles for spraying the coolant, respectively, and communicate with the outer surfaces of the adapters. A horizontal hole into which the cylindrical poppet seat is inserted into is provided on one side of the adapter, and the horizontal hole has a conical tip of the poppet fixed to the rear end of the poppet seat in contact with the rear of the poppet seat. The cylinder is coupled to the cylinder, and the rear end of the cylinder seals the inner hole while fixing a spring for supporting the piston forwardly, and a cap having an air connector. A jetting unit for jetting and blocking the coolant; and first, third, fifth, and seventh intermittent first, third, fifth, and seventh narrow air lines respectively connected to cylinders of a plurality of adapters mounted in the narrow section of the header; The second, fourth, sixth and eighth wide lines connected to the calculators to which the basic rolling data are input so as to enable narrow injection and blocking of the narrow electron sides, and connected to the cylinders of a plurality of adapters installed in the wide sections, respectively; The 4,6 and 8 wide electron sides are connected to the calculator to enable wide injection and blocking, respectively, and the front and rear sensors for detecting the front and rear ends of the rolled material and controlling the injection and blocking of the coolant, respectively. Hot-rolled, characterized in that the control unit for selectively spraying the cooling water in a narrow, wide width according to the width size of the, and blocking the injection of the cooling water in accordance with the material of the rolled material By providing a roll coolant spray device of the machine.

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

Figure 2 is a longitudinal cross-sectional view showing the operating state of the injection unit employed in the roll cooling water injector of the hot rolling mill according to the present invention, Figure 3 is an exploded view showing the injection unit employed in the roll cooling water injector of the hot rolling mill according to the present invention 4 is a longitudinal sectional view showing a spray unit employed in the roll cooling water injector of the hot rolling mill according to the present invention, and FIG. 5 is an overall perspective view showing the roll cooling water injector of the hot rolling mill according to the present invention. 6 is a plan view showing a roll cooling water injection device of a hot rolling mill according to the present invention.

As shown in FIGS. 2 to 6, the roll cooling water injector 1 of the hot rolling mill according to the present invention is provided on the front, rear, upper and lower portions of the upper and lower work rolls 12 and 22 where the rolling process is performed. Cooling water can be sprayed at a narrow and wide width through the respective headers 2a, 2b, 2c, and 2c connected to the coolant line 6 to fit the width of the rolled material 3, respectively. In order to further improve the cooling efficiency by separating and spraying before and after the steel grade of the rolled material 3, the apparatus 1 is composed of the injection unit 200 and the control unit 300.

That is, the injection unit 200 in which the coolant is sprayed is installed at the front, rear, and top and bottom of the rolls 12 and 22, respectively, and each header 2a connected to the coolant line 6 to which the coolant is supplied. ), (2b), (2c), (2d) is coupled to a plurality of fixed holes 210a perforated at regular intervals on the outer surface of the cube (Adaptor) to block and supply the cooling water appropriately according to the rolling conditions ( 2 to 4, the adapter 210, as shown in Figures 2 to 4, is recessed from the top to the center line from the top to the bottom so that a waterway (水路) is formed in the body, the fixing hole (210a) The lower hole 212 is provided with an upper hole 211 to which the fixed nipple 201 to be assembled is coupled to the upper surface, and is equally recessed from the bottom to the center line in the upper direction, and the injection nozzle 202 in which the cooling water is sprayed is coupled. Each of the lower surface is provided with the upper, lower holes 211, 212 are mutually While not meeting, one side of the adapter 210 is provided with a horizontal hole 213 in the horizontal direction to communicate with the upper, lower holes 211, 212.

And, one side of the upper, lower holes 211, 212 and the horizontal hole 213, respectively, and processes the thread, equipped with a sealing O-ring 216 on the inner peripheral surface of the horizontal hole 213, A cylindrical poppet seat 214 is formed by drilling a plurality of through holes 215 between the lower holes 211 and 212.

In addition, a piston 222 in which the packing member 222a is fitted on the outer circumferential surface of the horizontal hole 213 having the threaded portion is assembled to the inner hole 221 so as to be moved forward and backward, and the sealing O-ring ( Coupling of the cylinder 220 having a 220a, and the poppet 223 is inserted into the inner hole 221 and coupled to the piston 222 to enable forward and backward movement in the inner circumferential surface of the horizontal hole 213 The rear end is provided with a split pin 225 to prevent the loosening of the nut 224 is fastened to form a screw portion, while another sealing o-ring 226 in the mounting groove 226a provided in the body end of the cylinder 220 ) To seal the length of the poppet 223 having a conical tip.

In addition, a buffer spring 227 is provided in the inner hole 221 of the cylinder 220 which is screwed to the mouth side of the horizontal hole 213 by having a threaded portion at the outer circumferential surface of the front and rear ends so as to elastically support the piston 222 forward. The cap 228 for sealing the inner hole 221 while fixing it without leaving the outside is screwed to the outer peripheral surface of the rear end of the cylinder 220, and has a sealing O-ring (228a) in contact with the rear end of the inner peripheral surface Meanwhile, the air connector 229 to supply compressed air through the air lines 311, 312, 313, 314, 315, 316, 317, and 318 which will be described later. ), And configure.

In this case, the coolant is supplied to the inside of the headers 2a, 2b, 2c, and 2d through the coolant line by the operation of the pump under the rolling preparation condition, thereby affecting the air pressure. By the forward, backward operation of the) will be able to quickly and the injection and blocking of the coolant through the adapter (210).

Then, the control unit 300 for selectively spraying the cooling water narrow and wide to match the width of the rolled material (3), and blocking the injection of the coolant in accordance with the material of the rolled material (2) is shown in FIGS. As shown, the outer surface of the header (2a), (2b), (2c), (2d) of the upper and lower portions of the front and rear, respectively, based on the roll (12), (22) When a plurality of, preferably 27 adapters 210 are mounted at regular intervals, respectively, when rolling the rolled material 3 having a narrow width of 1500 mm or less, the headers 2a, 2b and 2c To the cylinder 220 of each adapter 210, which is mounted in a plurality, preferably 21, at a predetermined interval in each narrow section (X) of (2d), so that the poppet 224 to move forward and backward The first, third, fifth and seventh narrow air lines 311, 313, 315, and 317, which are connected to the cylinder 220, are connected to each other, and the supplied compressed air is interrupted to cool the water. It constitutes equipped with claim 1,3,5 and 7 Narrow electronic valve 321, 323, 325, 327 to control the injection and shut off.

Then, to configure the wide section Y of the headers 2a, 2b, 2c, and 2d injecting cooling water to cool the rolled material 3 having a wide width of 1500 mm to 2000 mm. In order to operate the poppet 224 as described above, the second air supplying the compressed air to the cylinder of each adapter 210, which is mounted in a plurality, preferably about three, on both sides from the narrow section X, 4, 6, and 8 wide air lines 312, 314, 316, and 318 are connected to each other and intermittent compressed air can be controlled to control the injection and blocking of the coolant. 2, 4, 6, and 8 wide electron sides 322, 324, 326, and 328 are provided, respectively.

The first, third, fifth, and seventh narrow electron sides 321, 323, 325, and 327, and the second, 4.6, and 8 wide electron sides 322, 324, 326, and 328. Is equipped with 4 port 2 position and one side solenoid type so that compressed air can be supplied and shut off during external power supply or erasing. While the air is blocked, the poppet 224 of the cylinder 220 is operated backward to open the waterway, while the power is switched back to the B position when the power is turned off, and the compressed air is supplied to allow the coolant to be blocked. 224 is forwarded to shut off the waterway. In addition, the electron sides 321, 323, 325, 327, 322, 324, 326, and 328 are narrow and wide depending on the width of the rolled material 3. It is connected to the rough rolling calculator 400, which is supplied from the main rolling calculator (not shown), and the basic rolling data such as the width, thickness and rolling amount of the rolled material are supplied so as to properly instruct the injection.

In addition, the front and rear ends of the rolls 12 and 22 are detected at the front and rear ends of the rolled material 2, such as stainless steel, to detect the electromagnetic edges 321, 323, 325, and 327. The front and rear sensors 301 and 302 for applying external power to 322, 324, 326, and 328 from the front and rear of the rolls 12 and 21 at a predetermined distance. By installing each of the places away, the rolled material (3) passing through the rolls (12) and (21), because the compressed air is supplied to the airline in which the air supply is blocked when the detection signal is generated to block the channel of the adapter (210) In order to prevent falling water on the upper surface of the) it is possible to quickly block the cooling water injected from the injection nozzle 202 to prevent the temperature down phenomenon of the conventional rolled material (3).

When the rolled material 3, such as ordinary steel, is rolled through the roll 12 and 21 in the forward and reverse directions a plurality of times by using the roll cooling water injector 1 of the hot rolling mill as described above, Is filled in the respective inner spaces of the headers 2a, 2b, 2c, and 2d by starting a coolant pump (not shown) in a rolling ready state, and the injection nozzle 202 of the adapter 210 is When the rolls 12 and 22 are driven in the standby state in which injection from the air is blocked, at the same time, injection is performed in a narrow width and wide width according to the width size of the rolled material 3 in the rough rolling calculator 400. The first, third, fifth, and seventh narrow electron sides 321, 323, 325, and 327 and the second, 4.6, and 8 wide electron sides 322, 324, 326, and 328. Each of them is controlled.

That is, when the width of the rolled material 3 is 1500 mm or less, it is determined by the calculator 400 to be narrow width injection, and thus the first, third, fifth and seventh narrow air lines 311, 313, (( When the external power is applied to the first, third, fifth and seventh narrow electromagnetic valves 321, 323, 325, and 327 to block the compressed air supply at 315 and 317, the coolant is shut off. Since the compressed air that pushes the poppet 224 forward while the switch is switched from the position of B for supplying compressed air to the position A is discharged to the outside, the inner hole 221 of the cylinder 220 is switched to the standby state. The poppet 224 is naturally pushed backward by the hydraulic pressure of the cooling water being pushed through the upper hole 211 connected to the fixed nipple 201.

In this case, the upper hole 211 and the poppet seat 214 of each adapter 210 mounted in a plurality of narrow sections X of the headers 2a, 2b, 2c, and 2d, respectively. While the ball 215 and the lower hole 212 communicate with each other to form a channel, the coolant is simultaneously sprayed through the injection nozzle 202, while the second, 4, 6, and 8 wide electron valves 322, 324 are formed. , 326, and 328 maintain the initial state without external power applied from the second, fourth, sixth and eighth wide air lines 312, 314, 316, and 318. Since compressed air is supplied to the cylinder 220 side, unnecessary cooling water loss can be prevented by blocking the channels of the adapters 210 mounted on both sides of the narrow section X. At this time, the impact of the poppet 225 that is rapidly pushed backward by the hydraulic pressure of the cooling water is sufficiently mitigated by the buffer spring 227 installed in the inner hole 221 of the cylinder 220.

On the other hand, when the width of the rolled material (3) is a width of more than 1500mm, the first and the third so that the cooling water spray as described above is made in all the sections (2a), (2b), (2c), (2d) External to the second, fourth, sixth and eighth wide electron sides 322, 324, 326, and 328, with 5, and 7 narrow electron sides 321, 323, 325, and 327 When power is applied, the first, third, fifth and seventh narrow lines 211, 213, 215, and 217, as well as the second, fourth, sixth and eighth lines 212, 214 Since the compressed air through the 216, 218 is blocked and the compressed air of the inner hole 221 of the cylinder 220 connected thereto is discharged to the atmosphere, the headers 2a, 2b, and 2c. (2d) While the poppet 224 of the cylinder 220 mounted in the entire section is pushed backward to open the water channel, the cooling water is injected through the injection nozzle 202 of the adapter 210.

When the rolled material 3 is made of stainless steel, falling water is generated on the upper surface of the rolled material 3 while spraying cooling water in the narrow and wide sections in the same manner as the general steel, in the narrow and wide sections. The front upper and lower headers 2a and 2b according to detection signals of the front and rear sensors 301 and 302 which are installed at a predetermined distance from the front and rear of the rolls 12 and 22 so as not to The upper and lower headers 2c and 2d on the rear side should spray the cooling water to prevent the temperature increase of the rolled material 3, as shown in FIG. When the leading end is detected by the front sensor 301 while traveling forward on the table roller 4, the detection signal is input to the calculator 400, and in front of the rolls 12 and 22, The first and third narrow electron sides 321, 323, and the second and fourth wide widths to which an external power source is applied to temporarily block cooling water injection. The supply of compressed air through the first and third narrow air lines 311 and 313 and the second and fourth wide air lines 312 and 314 by eliminating external power sources of the magnetic domains 322 and 324. Since the conical tip of the poppet 224 pressed forward in the cylinder 220 and the rear end of the poppet seat 214 are in contact with each other, the channel of the adapter 210 is blocked to close the header 2a, Shut off the coolant at the roll front through (2b).

Subsequently, when a few seconds have elapsed after the front sensor 301 has been released, the first and third narrow electron sides 321 and 323 and the second and fourth wide electron sides of which the external power is removed from the calculator 400 are removed. 322) and 324, and external power is applied again to the opposite of the above, so that the compressed air through the first and third narrow air lines 311 and 313 and the second and fourth wide air lines 312 and 314 Since the supply is cut off and the compressed air in the cylinder 210 is discharged to the atmosphere, the channel of the adapter 210 of the headers 2a and 2b is opened to spray the coolant.

When the front end of the rolled material 3 passing through the rolls 12 and 22 is detected by the rear sensor 302, the calculator 400 shows the back of the rolls 12 and 22. The fifth and seventh narrow air lines 315 are removed by eliminating external power to the fifth and seventh narrow electron sides 325 and 327 and the sixth and eighth wide electron sides 326 and 328 to block the cooling water injection. Since compressed air is supplied through 317 and the 6th and 8th wide air lines 316 and 318 to block the channel of the adapter 210, the headers 2c and 2d installed on the rear surface are blocked. Cooling water spray on the rear of the roll 12, 22 through the through quickly to prevent falling water.

In the reverse rolling of the rolled material 3 such as stainless steel, it is detected by the rear sensor 302, so that the headers 2c and 2d provided on the rear surfaces of the rolls 12 and 22 during the rolling operation. It is possible to prevent surface water drop caused by falling water by preventing cooling water from spraying. That is, during the first, third and fifth forward rolling, rolling is performed in a state in which cooling water injection of the front upper and lower headers 2a and 2b installed on the front of the rolls 12 and 22 is blocked. During the fourth reverse rolling, rolling is performed in a state in which cooling water injection on the rear, upper and lower parts 2c and 2d is blocked, thereby preventing the surface temperature drop of the rolled material 3 due to the fall of cooling water as in the prior art. This will ensure the quality of the rolled products while reducing the raw unit of the furnace.

In addition, when the length of the material is increased by the rolling operation of the stainless steel as described above, when the front and rear ends are simultaneously detected by the front and rear sensors 301 and 302, the front and rear surfaces of the rolls 12 and 22 are installed. It prevents falling water by blocking the cooling water spray from all headers to prevent the temperature drop and the quality deterioration of the rolled material which is rolled again and thinned.

According to the present invention as described above, by spraying the cooling operation of the coolant through the header (2a), (2b), (2c), (2d) automatically according to the steel grade, width of the rolled material (3), After maintaining the proper temperature in rough rolling, it can be transferred to finishing rolling, which is a post-process, and the temperature reduction of the rolled material 3 is prevented in the intermediate rolling process, thereby reducing the raw unit of the furnace and improving the service life of the furnace. In addition to producing high quality hot rolled coils, it is possible to reduce the amount of cooling water used. In addition, a significant effect is obtained in terms of quality and energy saving by significantly reducing maintenance quantity while reducing water hammer occurring in the coolant line 6 to prevent premature deterioration of the coolant line 6 repeatedly.

Claims (1)

A plurality of headers (2a) having upper and lower backup rolls (11) and (21) and upper and lower work rolls (12) and (22) in upper and lower structures, and cooling water is supplied through the cooling water line (6). In the hot rolling facility having (2b), (2c) and (2d), the headers (2a), (2b), (2c) and (2d) are provided on the upper and lower surfaces of the adapter 210 made of a hexahedron. The upper and lower holes 211, 212, which are respectively coupled to the fixed nipple 201 and the spray nozzle 202 to which the coolant is injected, are fixed to the fixing holes 210a of the respective ones, and communicate with the plurality of through holes. A horizontal hole 213 into which the cylindrical poppet seat 214 having a hole 215 drilled into the outer surface is inserted into one side of the adapter 210, and the horizontal hole 213 has a piston which can be moved forward and backward. The cylinder 220 is coupled to the rear end of the poppet 223 fixed to the rear end of the poppet seat 214, and the piston 222 is connected to the rear end of the cylinder 220. Springs to support the spring forward An injection part 200 which seals the inner hole 221 while fixing the 227 and has a cap 228 having an air connector 229 to inject and block the coolant; and the headers 2a and ( 2, 1, 3, 5, and 7 narrow air lines 311 and 313 connected to the cylinders 220 of the plurality of adapters 210 mounted on the narrow sections X of 2b, 2c, and 2d, respectively. Rolling basic data is inputted to enable narrow injection and blocking of the first, third, fifth, and seventh narrow electron valves 321, 323, 325, and 327 that control the 315, 317. Second, fourth, sixth and eighth wide lines 312, 314 and 316 connected to the calculator 400 and connected to the cylinders 220 of the plurality of adapters 210 installed in the wide section Y, respectively. 2, 4, 6, and 8 wide electron sides 322, 324, 326, and 328 to control the 318 and 318 are respectively connected to the calculator 400 to enable wide injection and blocking. On the other hand, the front and rear sensors 301 for detecting the front and rear ends of the rolled material 3 to control the injection and blocking of the cooling water. And (302) to selectively spray cooling water in narrow width (X) and wide width (Y) in accordance with the width size of the rolled material (3), and to block the injection of the cooling water in accordance with the material of the rolled material (3) The control unit 300; roll cooling water injector of the hot rolling mill.