KR20170057880A - Device for scarfing slab, and control method thereof - Google Patents

Device for scarfing slab, and control method thereof Download PDF

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Publication number
KR20170057880A
KR20170057880A KR1020150160818A KR20150160818A KR20170057880A KR 20170057880 A KR20170057880 A KR 20170057880A KR 1020150160818 A KR1020150160818 A KR 1020150160818A KR 20150160818 A KR20150160818 A KR 20150160818A KR 20170057880 A KR20170057880 A KR 20170057880A
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South Korea
Prior art keywords
nozzle unit
unit
scarping
casting
moving
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KR1020150160818A
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Korean (ko)
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KR101755385B1 (en
Inventor
임승호
박영선
김진호
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주식회사 포스코
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Priority to KR1020150160818A priority Critical patent/KR101755385B1/en
Publication of KR20170057880A publication Critical patent/KR20170057880A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
    • B23K7/06—Machines, apparatus, or equipment specially designed for scarfing or desurfacing

Abstract

Disclosed is a slab scarfing device and a control method thereof. According to an embodiment of the present invention, the slab scarfing device comprises: a nozzle unit for scarfing a corner portion of a slab; a moving device for moving the nozzle unit closer to or away from a slab scarfing position; an entry sensing unit for sensing a front end of the slab entering into the scarfing position; a width sensing unit for sensing a width of the slab entering into the scarfing position; a proximity sensing unit for sensing the front end of the slab coming close to the scarfing position after sensing of the entry sensing unit; a nozzle position sensing unit for sensing a position of the nozzle unit moving to the scarfing position; and a control unit for controlling movement and scarfing operation of the slab and the nozzle unit. The present invention intends to provide a slab scarfing device and a control method thereof capable of realizing stable scarfing.

Description

TECHNICAL FIELD [0001] The present invention relates to a scarf scarfing apparatus and a control method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scraper scarifying apparatus for sparring corners of a cast steel and a control method thereof.

The slabs produced in the continuous casting process are cut to a suitable length after molding, heated in a reheating furnace, and then put into a rolling mill to produce hot-rolled coils. However, the cast steel produced in the continuous casting process often has a corner crack in the corner area. Particularly, in the case of steel such as medium carbon steel having a swelling reaction, the generation of corner cracks is severe.

Corner cracks in cast steel can lead to operating accidents such as sheet breakage in the rolling process and cause edge scab defects in the produced hot rolled coils, which may necessitate a significant amount of cutting of the hot rolled coil corners. Therefore, the cast steel of which the corner crack is liable to occur has been scarfing to remove the edge portion before the rolling process. In addition, since the sharp edges of the cast steel shrink the life span of the rolling roll by intensively wiping a specific portion of the rolled roll during the rolling process, scarping of the edge of the cast steel was required for the protection of the rolling roll.

Conventionally, a scarfing nozzle such as the example of U.S. Patent No. 3,254,696 was carried by a worker and scarfing was performed by a method of sparging the edge of the billet. However, this method has a very high workload and risk of safety accidents because the worker must work in a poor environment by wearing a heat shield, and the surface after the scarfing is uneven due to the difficulty of keeping the scarifying nozzle stable during the work process .

Korean Patent Laid-Open Publication No. 10-2012-0001823 has proposed a method for achieving faster and more stable scarping by sparging corner portions of a cast steel using a scarifying nozzle while moving a cast steel.

However, since the scarfing device is difficult to stably transport the cast material, scarring nozzles may be damaged due to collision between the scarfing nozzle and the end of the casting strip at the beginning of the scarfing operation, resulting in a great loss.

In consideration of such a problem, conventionally, scarfing has been performed except for a part of the edge of the end of the casting, and then the operator has removed the edge of the end of the casting through a grinding operation or the like. However, since the work for removing the edge of the end of the casting slab is to be performed after cooling the slab, it is difficult to work because the work is troublesome, and the scarfed cast slab is difficult to be heated again from the cold state .

In addition, the scraps transferred in the scarping process may have variable widths or some skews sometimes. In the conventional scarping device, it is difficult to realize uniform edge scarping when such a problem occurs.

U.S. Patent 3,254,696 (Registered on June 06, 1966) Korean Patent Laid-Open Publication No. 10-2012-0001823 (published on Jan. 05, 2012)

An embodiment of the present invention is directed to a scant scarf apparatus capable of preventing collision between a cast steel and a nozzle unit by performing scaping in a state in which a cast steel tip and a nozzle unit are accurately positioned at a scarping position, Control method.

Further, an embodiment of the present invention is to provide a scrapping apparatus and a method of controlling the scrapping apparatus capable of performing scaping with respect to the entire area of a corner of a billet.

Another object of the present invention is to provide a scrap scarping apparatus and a control method therefor which enable the nozzle unit to follow such a displacement and realize stable scarping when the width of the scrap or the irregular transfer occurs in the scarping process.

According to an aspect of the present invention, there is provided a nozzle unit comprising: a nozzle unit for scarifying a corner portion of a casting; A moving device for moving the nozzle unit closer to or away from the scaping position of the main spindle; An entrance sensing unit sensing the leading end of the casting entering into the scarping position; A width sensing unit sensing a width of the casting sheet entering the scarping position; A proximity sensing unit for sensing a tip of the casting in proximity to the scarping position after sensing the entrance sensing unit; A nozzle position sensing unit for sensing a position of the nozzle unit moving to the scarping position; And a control unit for controlling movement and scarping operation of the cast steel and the nozzle unit.

The entrance sensing unit may be disposed before the scarping position, the width sensing unit may be disposed before the insertion sensing unit, and the proximity sensing unit may be disposed between the entrance sensing unit and the scarifying position, respectively, .

Wherein the moving device comprises: a transverse moving part supported on a frame of the scarifying device and moving in a transverse direction intersecting with the feeding direction of the casting piece; And a vertically moving part for supporting the nozzle unit in a state where the transverse direction is installed on the moving part and implementing up and down movement of the nozzle unit.

The transverse direction moving part being supported by the frame so as to be movable in a lateral direction; A first transverse driving unit for transversely moving the first moving body; A second moving body movably supported on the first moving body in a lateral direction; And a second lateral driving unit for moving the second moving body in a lateral direction.

The nozzle unit may include an upper nozzle unit scouring an upper corner portion where an upper surface and a side of the casting meet, and a lower nozzle unit scouring a lower corner portion where the lower surface and the side face meet, A first vertically moving part supported by the second moving body and moving the upper nozzle unit vertically and a second vertically moving part supported by the second moving body and moving the lower nozzle unit vertically.

Wherein the upper nozzle unit includes an upper guide unit protruding from the upper nozzle unit so as to protrude toward the entering side of the upper nozzle unit and maintaining an interval between the upper nozzle unit and the upper surface of the casting, The lower nozzle unit may include a lower guide unit that is provided to protrude from the lower nozzle unit toward the entering side of the main nozzle and maintains a gap between the lower nozzle unit and the bottom of the casting nozzle.

The upper nozzle unit may further include a lateral guide unit contacting the side surface of the casting member to maintain a space between the upper nozzle unit and the side of the casting.

The second lateral drive may include a gas cylinder that allows lateral displacement of the second moving body in accordance with the width or position variable of the casting during scarcing.

Wherein the nozzle unit includes a main spray portion for spraying oxygen and fuel gas for scarring of the billet edge, and an injector for injecting oxygen and fuel gas for preheating the leading edge of the bill at the beginning of scalloping, May be set to a large value.

The spraying angle of the initial preheating spraying part may be set to 50 to 65 degrees.

The cast scarfing apparatus may further include a camera for photographing the scarping position to confirm preheating and scarping conditions.

According to another aspect of the present invention, there is provided a casting machine comprising: a casting conveying step for conveying a screed to a scarping position so as to control the conveying of the screed so that the leading end of the casting reaches exactly the scarping position and stops; Moving the nozzle unit to a scarping position after the feedstock transfer step; A nozzle unit position determination step of sensing a position of the nozzle unit moving to the scarping position and determining whether the position of the nozzle unit is good; And a scarping step of scaping the edges of the bill if the position of the nozzle unit is determined to be good in the step of determining the nozzle unit position.

The slip conveying step may include an entrance sensing step of sensing a leading end of the casting entering the scarifying position; A width measuring step of stopping the casting and measuring the width and eccentricity of the casting when the entrance of the casting is detected in the entrance sensing step; A proximity sensing step of transferring the slab relatively slowly after the width measuring step and detecting whether the leading end of the casting reaches the set proximity position before the scarping position; And shifting the casting further by the set distance so that when the leading end of the casting is detected at the close position, the casting tip is stopped at the scarping position.

After the width measurement step, it is determined whether the main part is eccentric. If it is determined that the main part is eccentric, the eccentricity of the main part can be corrected by the correcting device.

Wherein the scarping step includes an initial preheating step of performing preheating of the tip end edge of the cast steel at a relatively large spray angle using the initial preheating jetting unit of the nozzle unit in the casting state of the casting; And a main scarifying step of performing scaping of the billet edge at a relatively small spray angle using the main jetting unit of the nozzle unit during the feeding of the billet after the initial preheating step.

The main scarping step may control a moving device that moves the nozzle unit so that the nozzle unit follows the corner of the casting, corresponding to the width or position of the screed casting.

The scarping step may perform the main scarping step after performing the initial preheating step for a set time.

The nozzle unit position determination step may determine whether the position of the nozzle unit is good based on the information of the sensing unit that senses the position of the nozzle unit and the size and position information of the transferred casting unit.

The scion scarping apparatus according to the embodiment of the present invention precisely detects the leading end of the casting screw and the nozzle unit at the scarping position through the conveyance control of the casting apparatus entering the scarping position and the position judgment control of the nozzle unit moving to the scarping position The scrapping is performed in a state where the casting is performed, so that collision between the cast steel and the nozzle unit can be prevented, and stable casting of the cast steel can be realized.

The scarf scaping apparatus according to the embodiment of the present invention can perform scaping with respect to the entire region of the billet edge since scarping is started with the leading edge corner of the billet positioned at the scarping position.

The scanting apparatus according to the embodiment of the present invention can quickly preheat the leading edge portion of the casting to minimize the variation in the time taken to preheat each edge portion at the initial stage of the scarping operation It is possible to prevent a phenomenon that one of the corners is first melted and the melt flows down, and the subsequent scarping operation can be smoothly performed.

The scarf scarf device according to the embodiment of the present invention can perform stable scarping since the nozzle unit follows such displacement even when the width of the cast steel is varied or irregularly transferred in the scarping process.

1 is a perspective view showing the entire structure of a scarification scarifying apparatus according to an embodiment of the present invention.
2 is a perspective view illustrating a frame of a scantling scarf apparatus and apparatuses mounted thereon according to an embodiment of the present invention.
3 is a front view showing a frame of a scantling scarfing apparatus and apparatuses mounted thereon according to an embodiment of the present invention.
4 is a perspective view showing a moving device of a scantling scarifier according to an embodiment of the present invention.
FIG. 5 is a side view of a moving apparatus and an upper nozzle unit and a lower nozzle unit of a scantling scarf apparatus according to an embodiment of the present invention.
6 is a perspective view of an upper nozzle unit and a lower nozzle unit of a scantling scarf apparatus according to an embodiment of the present invention.
FIGS. 7A to 7C show stepwise operations in which the upper nozzle unit and the lower nozzle unit of the scantling scarf apparatus according to the embodiment of the present invention are moved closer to and apart from the work piece.
FIG. 8 is a side view of a moving apparatus and an upper nozzle unit and a lower nozzle unit of a scantling scarf apparatus according to an embodiment of the present invention, and shows a state in which the moving apparatus is operated so that the upper and lower nozzle units follow a peripheral displacement .
FIGS. 9 and 10 illustrate sensing units for feeding and delivering a cast steel to a scarfing position in a scion scarf apparatus according to an embodiment of the present invention. FIG. 9 is a plan view, Side view.
FIG. 11 shows the spray angle of the initial preheat spray part provided in the nozzle unit of the scion scarf apparatus according to the embodiment of the present invention and the spray angle of the main spray part.
12 and 13 are flowcharts showing a control method of the scarifier scarfing apparatus according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided to fully convey the spirit of the present invention to a person having ordinary skill in the art to which the present invention belongs, and the present invention is not limited thereto, but may be embodied in other forms. In order to clarify the present invention, it is possible to omit the parts of the drawings that are not related to the description, and the size of the components may be slightly exaggerated to facilitate understanding.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows the overall configuration of a scantling scarfing apparatus according to an embodiment of the present invention. As shown in the figure, the scrap scarfing apparatus simultaneously scours four corners of a cast S to be conveyed in a state where the scrap S produced in a continuous casting process or the like is installed on a conveying line 10 (runout table or the like) . Of course, it is also possible to select one of the corners of the casting and scarf.

1 and 2, the scant scarf apparatus includes a frame 100 movable in a direction intersecting the transfer line 10 with equipment for scarping mounted thereon, A running rail 110 installed on the floor of a factory or the like, and a frame driving unit 120 for moving the frame 100.

The frame 100 moves to the scarping position of the conveying line 10 along the running rail 110 by the operation of the frame driving unit 120 or moves to the waiting area on the side of the conveying line 10 out of the scarping position . In the waiting area, the scarping device can be checked or repaired.

2 and 3, the scant scarf apparatus includes an upper nozzle unit 200 for scarring upper edge of the cast steel S, a lower nozzle unit 300 for scarring the lower edge of the cast steel S And a moving device 400 installed in the frame 100 to move the upper nozzle unit 200 and the lower nozzle unit 300 to bring the upper nozzle unit 200 and the lower nozzle unit 300 closer to or apart from the edge of the piece S,

The moving device 400 may be provided on both sides of the frame 100 and the upper nozzle unit 200 and the lower nozzle unit 300 may be installed on the moving devices 400 on both sides. That is, the upper nozzle unit 200, the lower nozzle unit 300, and the moving device 400 are provided on both sides of the slab S in the same manner. Therefore, the cast scarfing apparatus of the present embodiment can simultaneously scour four corners of the cast steel S while the cast steel S is being conveyed.

4 and 5, the moving device 400 includes a first vertically moving part 410 for vertically moving the upper nozzle unit 200, a second vertically moving part for vertically moving the lower nozzle unit 300, 420, and a transverse moving part 430 which moves in the lateral direction while supporting the first vertically moving part 410 and the second vertically moving part 420.

The transverse direction moving part 430 includes a box-shaped first moving body 431 movably supported on the frame 100 in a transverse direction intersecting with the feeding direction of the slab S, The second moving body 433 supported so as to be movable in the lateral direction to the first moving body 431 and the second moving body 433 supported on the first moving body 431 in the lateral direction, 2 moving body 433 in the horizontal direction relative to the moving body 433.

The first transverse driving portion 432 may include driving means (roller, pinion gear, rack gear, driving motor, etc.) for causing the first moving body 431 to move along the rails 130 on the frame 100 And the second transverse driving unit 434 may be constituted by a gas cylinder or the like which pushes or moves the second moving body 433 in the lateral direction while being fixed to the first moving body 431. [

Since the second transverse driving unit 434 can be stretched and contracted by a predetermined interval by the pressure of the gas, when the width or position of the slab S changes in the scarfing process, the second transverse driving unit 434 is compressed or elongated following the second moving unit 433, And can be moved in the lateral direction of the predetermined section. Accordingly, the upper nozzle unit 200 and the lower nozzle unit 300 can perform the scaping while following the widthwise displacement of the bill S, respectively.

The first elevating and lowering portion 410 includes a first elevating member 411 supported by the second moving body 433 so as to be able to move up and down and a first elevating driving portion 412 for moving the first elevating member 411 up and down The second elevating part 420 includes a second elevating member 421 supported by the second moving body 433 so as to be able to move up and down and a second elevating driving part 422 moving the second elevating member 421 upward and downward, Respectively.

Referring to FIG. 5, the first elevating member 411 and the second elevating member 421 are installed to vertically move up and down in parallel with each other, and the upper nozzle unit 200 and the lower nozzle unit (300). The first lifting and lowering drive unit 412 can move the upper nozzle unit 200 up and down by moving the first lifting member 411 upward and downward while being mounted on the upper portion of the second moving body 433. [ The second lifting member 422 may be moved upward and downward while the second lifting member 422 is mounted on the second moving body 433 to move the lower nozzle unit 300 up and down. The first elevation driving part 412 and the second elevating driving part 422 may be constituted by a hydraulic cylinder or the like.

5 and 6, the upper nozzle unit 200 includes an upper nozzle frame 210 having a horizontal support portion 211 and a vertical support portion 212 and coupled to the first lift member 411, A top nozzle 220 mounted on the horizontal support 211 of the upper nozzle frame 210 to scrape the corner of the upper surface of the slice S and a vertical nozzle 220 mounted on the vertical support 212 of the upper nozzle frame 210, And a first side nozzle 240 scouring the upper corner portion. The upper surface nozzle 220 and the first side surface nozzle 240 are coupled to the upper nozzle frame 210 and move together by the operation of the first lifting member 411.

The lower nozzle unit 300 includes a lower nozzle frame 310 having a horizontal support portion 311 and a vertical support portion 312 and coupled to the second lift member 421, a horizontal support portion 311 of the lower nozzle frame 310, A lower side nozzle 320 scarfing the corner of the bottom of the slab S and a second side 321 scarfing the lower side edge of the side of the slab S by being mounted on the vertical support 311 of the lower nozzle frame 310, And a nozzle 340. The lower surface nozzle 320 and the second side surface nozzle 340 are coupled to the lower nozzle frame 310 and are moved together by the operation of the second lifting member 421.

11, the upper nozzle 220 of the upper nozzle unit 200 includes a main jetting unit 231 for jetting oxygen and fuel gas for scarring at the edge of the billet S, And an initial preheat jetting section 232 for jetting corals and fuel gas for preheating the end of the cast strip. The main spraying section 231 and the initial preheat spraying section 232 are disposed on the first side nozzle 240 of the upper nozzle unit 200 and the lower side nozzle 320 and the second side nozzle 340 of the lower nozzle unit 300, And may be provided in a manner equivalent to that of the upper surface nozzle 220.

11, the main spray part 231 functions to realize the sparging of the corner of the billet during the conveyance of the bill S, and the initial preheat spray part 232 moves the edge of the bill at the beginning of the scaping operation, (The nipple portion) is quickly preheated so that subsequent scaping work can be performed smoothly.

The spray angle? 1 of the main spray part 231 may be set to about 24 to 25 degrees and the spray angle? 2 of the initial preheat spray part 232 may be set to about 50 to 65 degrees. The relatively large spray angle [theta] 2 of the initial preheating spray part 232 can be obtained by rapidly heating the leading edge part when performing the preheating of the leading edge part using the initial preheating spray part 232 at the beginning of the scarping operation, And to minimize the variation in the time taken to preheat the four corners. It is possible to prevent the phenomenon that one of the four corner portions melts first and the melt flows down when the preheating edge of the casting tip is rapidly preheated and the preheating time deviation of each corner portion is reduced. Therefore, it is possible to prevent the phenomenon that the nozzles (lower surface nozzles, second side nozzles) located on the lower side are clogged by the melted material flowing down.

When the preheating of the four corners by the initial preheat spraying unit 232 is completed, the main spraying unit 231 generates a flame for scaping together with the feeding of the screed to perform scaping of the edge of the screed. The heating by the initial preheat spraying part 232 can be maintained during the scarping operation, but the scarping operation of the main spraying part 231 is not greatly affected.

5 and 6, the upper nozzle unit 200 is installed so as to be in contact with the upper surface of the billet S entering for scarping so as to maintain the gap between the upper surface of the bill S and the upper surface nozzle 220 And a side guide unit 280 provided so as to be in contact with the side surface of the cast steel S to maintain the gap between the side surface of the cast steel S and the first side surface nozzle 240. [

7, the upper guide unit 270 includes a guide wheel 271 positioned in front of the injection port of the upper surface nozzle 220 toward the entry of the cast steel S and contacting the upper surface of the cast steel S, And a wheel housing 273 that supports the wheel 271 and is mounted on the upper nozzle frame 210.

The guide wheel 271 is arranged so as to protrude from the upper surface nozzle 220 by a predetermined distance L in the entry direction of the slab S as shown in Fig. 6, So that the guide wheel 271 of the upper guide unit 270 can be held in contact with the upper surface of the slab S in a state where the upper guide unit 270 reaches a position where scaping is possible.

When the upper guide unit 270 is supported on the upper surface of the cast steel while the leading edge S1 of the cast steel S is in the scarfing position, the upper guide unit 200 maintains the gap with the cast steel S Can be supported. Therefore, stable scaping can be realized from the leading edge portion S1 of the cast steel S to the rear end thereof. That is, in the related art, scarring of the leading edge of the billet S is difficult in relation to the initial positioning of the nozzle unit and the billet S. On the contrary, in the present embodiment, scaping is performed with respect to the entire region of the billet S .

The lateral guide unit 280 is coupled to the vertical support portion 212 of the upper surface nozzle frame 210 on which the first side nozzle 240 is mounted, as shown in FIG. The side guide unit 280 includes at least one guide wheel 281 contacting with the side surface of the cast S to maintain the gap between the cast side and the first side nozzle 240.

The lower nozzle unit 300 also includes a guide wheel 381 which is located forward of the injection port of the lower nozzle 320 and supports the lower surface of the casting jig like the upper guide unit 270, And a lower guide unit 380 having a wheel housing 382 mounted on the lower nozzle frame 310 to support the lower nozzle frame 381. The lower guiding unit 380 also protrudes in the direction in which the cast piece S enters and abuts on the lower surface of the casting so that the interval between the lower nozzle unit 300 and the casting bottom is maintained. The lower nozzle unit 300 may be provided with a spacer 370 for maintaining a gap between the upper nozzle unit 200 and the lower nozzle unit 300.

The upper guide unit 200 and the lower guide unit 300 support the upper surface and the lower surface of the main body, respectively, as shown in Figs. 7B and 8, respectively. Therefore, even when vertical movement of the cast steel S occurs in the scarfing process, the separation between the cast steel S and the upper nozzle unit 200 and the lower nozzle unit 300 is prevented to prevent these scrapes, .

FIGS. 7A to 7C show steps in which the upper nozzle unit 200 and the lower nozzle unit 300 are separated from the operation for approaching the bill S, and FIG.

Referring to FIG. 7A, when the billet S enters a position for scarping, the upper nozzle unit 200 approaches the upper edge of the billet S first. At this time, the upper nozzle unit 200 is positioned such that the upper guide unit 270 and the lateral guide unit 280 are in contact with the upper surface and the side surface of the cast steel S, The gap between the side nozzle 240 and the side surface of the slab S can be accurately maintained under the conditions set for scarping.

Referring to FIG. 7B, after the position of the upper nozzle unit 200 is determined, the lower nozzle unit 300 rises. The lower nozzle unit 300 is lifted until the upper end of the spacer 370 contacts the upper nozzle unit 200 so that the interval between the upper nozzle unit 200 and the lower nozzle unit 300 is set to a condition set for scarping Can be accurately maintained. That is, the gap between the nozzle 320 and the bottom surface of the slab S and the gap between the second side nozzle 340 and the side surface of the slab S can be accurately maintained. Further, the lower guide unit 380 is kept in contact with the bottom surface of the cast steel S to maintain the gap between the lower nozzle unit 300 and the bottom surface of the cast steel. The scanting scaping apparatus can perform scaping of the corner portion of the slab S while moving the slab S in this state.

On the other hand, when performing scarping, the mobile device 400 operates from the state of FIG. 5 to the state of FIG.

When the upper nozzle unit 200 and the lower nozzle unit 300 move to the scarfing position, the second moving body 433 moves to the first moving body 431 by the operation of the second lateral driving unit 434, The first moving body 431 is moved by the operation of the first lateral driving unit 432 while the upper nozzle unit 200 and the lower nozzle unit 300 are shifted to the right Lt; / RTI >

When the scarping starts in this state, only the first moving body 431 moves slightly to the right (as shown in the drawing) as the example shown in FIG. 8 by the operation of the first lateral driving portion 432. Therefore, a margin of delta / 2 is provided between both sides of the second moving body 433 and the inner surfaces of both sides of the first moving body 431 so that the second moving body 433 follows the side surface displacement of the bill S, It becomes movable. That is, the first transverse driving unit 434 is in the form of a gas cylinder so that it can be expanded or contracted by an external force, allowing the displacement of the second moving body 433 in a slightly compressed state, So as to maintain the state of pressing the side of the cast slab S following the displacement.

In the scaping process, when the width and / or the position of the slip S under conveyance is varied, the second moving body 433 moves in the lateral direction of the predetermined section following the displacement, 200 and the lower nozzle unit 300 can follow the lateral direction displacement of the casting.

After scaping of the billet S edge is completed, the upper nozzle unit 200 and the lower nozzle unit 300 are spaced from the scarfing position, as shown in Fig. 7C.

1, the cast scarf (S) scarf apparatus of the present embodiment is provided so as to surround a front region of the upper nozzle unit 200 and the lower nozzle unit 300 into which the cast S enters, A slag chamber 500 for collecting slag scattered by scarping, and a high-pressure water injector (not shown) arranged in the slag scattering region inside the slag chamber 500 to cool and collect the scattered slag . The slag chamber 500 surrounds the front space of the scarfed area so that the molten slag does not scatter to the outside. In the lower part of the slag chamber 500, the collected slag and the discharge passage 510 through which the flowing high-pressure water is discharged may be provided.

9 and 10, the scant scarf device of the present embodiment accurately moves the tip end of the cast steel S and the upper and lower nozzle units 200 and 300 to the scarfing position P, Stable scarping can be realized while preventing the lower nozzle units 200 and 300 from colliding with each other. To this end, the scarping device comprises a calibration device 601 for calibrating the orientation of the slab S entering the scarping position P in the transfer line 10 prior to the scarping position P, A width detecting unit 603 for detecting the width and eccentricity of the cast steel entering the scarping position P, a scarping position after detection of the entrance detecting unit 602, A proximity sensing unit 604 for sensing the tip of the slice S approaching the scooping position P, a nozzle position sensing unit 605 for sensing the positions of the upper and lower nozzle units 200 and 300 moving to the scarifying position, And a control unit (not shown) for controlling the movement and scarping operation of the nozzle unit.

Before the scarping position P, the width detecting unit 603 is positioned before the transfer detecting unit 602, and the proximity sensing unit 604 is positioned before the scarping position P, And may be disposed between the sensing unit 602 and the scarping position P, respectively. The nozzle position sensing unit 605 may be installed on the side of the upper nozzle unit 200 and the lower nozzle unit 300 to sense the positions of the upper and lower nozzle units 200 and 300. Near the scarping position P, a plurality of cameras 610 may be provided for photographing the scarping position P to confirm the preheating and scarping state of the casting as in the example shown in Fig.

The entrance sensing unit 602, the width sensing unit 603, the proximity sensing unit 604 and the nozzle position sensing unit 605 may be non-contact sensors such as an ultrasonic sensor, an infrared sensor, and a laser sensor.

Next, the operation and control method of the scantling scarifier according to the embodiment of the present invention will be described with reference to Figs. 9, 10, 12, and 13. Fig.

When a scaping object slip S is supplied to the transfer line 10 to prepare for scaping of the slice S and a command for scaping is commanded, the control unit operates the transfer line 10, (S) to the scarping position (711). The conveyed slab S can be calibrated (712) by reaching the calibrating device 601 of the conveying line 10. The calibrating device 601 may include a hydraulic cylinder or the like which corrects the position of the cast steel S by pushing a side or the like so that the cast steel S can be correctly conveyed along the set conveyance path.

When the slab S enters the scarping position P, the control unit senses the incoming slab and performs a slab feed step of controlling the feed of the slab so that the leading end of the slab accurately reaches and stops at the scarifying position.

In the slip conveying step, an entry detecting step 713 for detecting the leading end of the casting entering the scarping position P, a width measuring step 715 for measuring the width and eccentricity of the casting, (Step 719). When the leading end of the casting is detected in the proximity position, a step 721 is performed to further move the casting set so that the leading end of the casting reaches the scarfing position and stops .

The entrance detecting step 713 detects whether or not the leading end of the casting enters the scarping position P through detection of the entrance detecting unit 602 installed on the conveying line 10. In step 713, when the entrance of the mullion is detected, the operation of the transfer line 10 is stopped to stop the mullion 714. At this time, the cast can move toward the predetermined section scarping position due to inertia.

The width measurement step 715 measures the width of the cast steel and whether or not the cast steel has moved eccentrically by sensing the width sensing unit 603 in a state where the feeding of the cast steel is stopped. After the width measurement step 715, the eccentricity of the main part is determined based on the measured result (716). If it is determined that the main part is eccentric, the eccentricity of the main part can be corrected using the calibration device 601 (717).

The proximity sensing step 719 determines whether the leading end of the casting reaches the proximity position set before the scarping position P by sensing the proximity sensing unit 604 while transferring the casting relatively slowly after the width measurement step 715 (718, 719, 720). In the proximity sensing step 719, the casting is slowly conveyed at a speed of about 3 m / min, and when the conveying line is stopped to stop the conveyance of the casting, the casting can be stopped immediately.

If the leading end of the casting is detected in the proximity sensing step 719, the control unit controls the conveying line 10 to move the casting further by a set distance, and then stops the casting so that the leading end of the casting reaches the desired scarping position P (721).

A step 722 of moving the upper nozzle unit 200 and the lower nozzle unit 300 to the scarping position P after the leading edge of the slice S has reached the scarping position P, A nozzle unit position plate step for determining whether the positions of the upper and lower nozzle units 200 and 300 moving to the nozzle unit 200 are good.

The nozzle unit position determination step may include determining the position of the upper nozzle unit 200 and the lower nozzle unit 300 by sensing the nozzle position sensing unit 605 when moving the upper nozzle unit 200 and the lower nozzle unit 300 to the scarifying position P, The position of the unit 300 is sensed (723) and it is determined whether the positions of the upper nozzle unit 200 and the lower nozzle unit 300 are good (724). At this time, it is possible to determine whether the positions of the upper and lower nozzle units 200 and 300 are good based on the sensing information of the nozzle position sensing part 605, the size and position information of the transferred casting part, and the operation information of the mobile device 400 have.

The slip entering the scarping position P may not enter the slip or the like, and in this state, the upper nozzle unit 200 and the lower nozzle unit 300 can move to the scarfing position. The upper guide unit 270 of the upper nozzle unit 200 does not come into contact with the cast steel S and the abnormal scarping occurs or the cast steel S and the upper and lower nozzle units 200, The position of the upper nozzle unit 200 and the lower nozzle unit 300 is determined in the nozzle unit position determination step 724 to prevent such a problem.

When it is determined that the positions of the upper and lower nozzle units 200 and 300 are not good in the nozzle unit position determination step 724, the upper nozzle unit 200 and the lower nozzle unit 300 are separated from the billet S, (725), and the casting can be reversed and carried out again from the casting stage (726).

If it is determined in the nozzle unit position determination step 724 that the upper nozzle unit 200 and the lower nozzle unit 300 are moved to the scarfing position well, the upper nozzle unit 200 and the upper nozzle unit 200, And carries out a scarping step of scaping the corners of the slab S using the lower nozzle unit 300.

As shown in FIG. 13, the scarping step may be performed by using the initial preheat spraying unit 232 of the upper and lower nozzle units 200 and 300 while the cast steel is stopped, And a main spraying part 231 of the upper and lower nozzle units 200 and 300 during the feeding of the slab after the initial preheating step 727 and 728. In this case, And a main scarping step 729 for performing scarping of the edges.

The scarping step may be set to perform the initial preheating step 727 to perform the set time, and after determining whether the set time has elapsed (728), the main scaping step 729 may be performed automatically when the set time has elapsed have. In this case, the operator can confirm the preheating and scarping state through the image of the camera 610 and directly control the operation of the scarifying device if necessary.

In the main scarping step 729, a moving device 400 (not shown) moves the upper and lower nozzle units 200 and 300 so that the upper and lower nozzle units 200 and 300 follow the corner of the casting, (730). 8, the upper and lower nozzle units 200 and 300 can follow the widthwise displacement of the casting sheet by keeping the second moving body 433 movable in the transverse direction of the predetermined section . Therefore, even when the widthwise displacement of the cast steel during the scarping causes meander, stable scarping can be performed.

In the scarping step, completion of scarping is detected through a sensor for detecting whether the rear end of the cast has passed the scarping position (P), and it is determined whether the scarping is completed based on the detected completion (732). If it is determined that the scaping is completed, the upper nozzle unit 200 and the lower nozzle unit 300 are moved to the home position (733), and the scarping operation can be terminated.

10: transfer line, 100: frame,
110: running rail, 200: upper nozzle unit,
220: upper surface nozzle, 240: first side nozzle,
270: upper guide unit, 280: lateral guide unit,
300: lower nozzle unit, 320: lower nozzle,
340: second side nozzle, 370: spacer,
380: Lower guide unit, 400: Moving device,
410: first upper and lower easel, 411: first elevating member,
412: a first elevating driving part, 420: a second elevating east part,
421: second elevating member, 422: second elevating driving portion,
430: transverse direction moving portion, 431: first moving body,
432: a first lateral driving part, 433: a second moving body,
434: second transverse driving part, 500: slag chamber,
601: calibration device, 602: entry detection unit,
603: width detection unit, 604: proximity detection unit,
605: nozzle position detection unit, 610: camera.

Claims (18)

A nozzle unit for scarifying corner portions of the casting;
A moving device for moving the nozzle unit closer to or away from the scaping position of the main spindle;
An entrance sensing unit sensing the leading end of the casting entering into the scarping position;
A width sensing unit sensing a width of the casting sheet entering the scarping position;
A proximity sensing unit for sensing a tip of the casting in proximity to the scarping position after sensing the entrance sensing unit;
A nozzle position sensing unit for sensing a position of the nozzle unit moving to the scarping position; And
And a control unit for controlling movement and scarping operation of the cast steel and the nozzle unit. The method according to claim 1,
Wherein the entrance sensing unit is positioned before the scarping position, the width sensing unit is positioned before the entrance sensing unit, and the proximity sensing unit is positioned between the entrance sensing unit and the scarping location, Caring device. The method according to claim 1,
The mobile device
A transverse moving part supported on a frame of the scarifying device and moving in a transverse direction intersecting with the feeding direction of the main piece; And
And a vertically moving part for supporting the nozzle unit in a state where the transverse direction is installed on the moving part and realizing up-and-down movement of the nozzle unit. The method of claim 3,
The transverse direction moving part
A first moving body movably supported on the frame in a lateral direction;
A first transverse driving unit for transversely moving the first moving body;
A second moving body movably supported on the first moving body in a lateral direction;
And a second transverse driving part for moving the second moving body in a lateral direction. 5. The method of claim 4,
The nozzle unit includes an upper nozzle unit scouring an upper corner portion where an upper surface and a side of the casting meet, and a lower nozzle unit scouring a lower corner portion where the lower surface and the side face meet,
Wherein the upper and lower moving parts are supported by the second moving body and have a first vertical moving part moving the upper nozzle unit vertically and a second vertical moving part supported by the second moving body and moving the lower nozzle unit vertically, Scaping device. 6. The method of claim 5,
Wherein the upper nozzle unit includes an upper guide unit that protrudes from the upper nozzle unit toward the entering side of the main nozzle and maintains a gap between the upper nozzle unit and the upper surface of the main barrel,
Wherein the lower nozzle unit includes a lower guide unit protruding from the lower nozzle unit so as to protrude from the lower nozzle unit and maintaining a gap between the lower nozzle unit and the bottom surface of the casting. The method according to claim 6,
Wherein the upper nozzle unit further comprises a lateral guide unit contacting the side surface of the casting and maintaining a gap between the upper nozzle unit and the side of the casting. 8. The method according to claim 4 or 7,
Wherein the second transverse drive portion includes a gas cylinder that allows lateral displacement of the second moving body in accordance with the width or position variable of the casting during scarring. The method according to claim 1,
Wherein the nozzle unit includes a main spray portion for spraying oxygen and fuel gas for scarring of the billet edge, and an injector for injecting oxygen and fuel gas for preheating the leading edge of the bill at the beginning of scalloping, And the initial preheating jetting portion is set to a large value. 10. The method of claim 9,
Wherein the spray angle of the initial preheating spray portion is set to 50 to 65 degrees. The method according to claim 1,
Further comprising a camera for photographing the scarping position to confirm preheating and scarping conditions. A slab feeding step of detecting a slab entering the scarping position and controlling the slab feed so that the leading end of the slab accurately reaches and stops at the scarfing position;
Moving the nozzle unit to a scarping position after the feedstock transfer step;
A nozzle unit position determination step of sensing a position of the nozzle unit moving to the scarping position and determining whether the position of the nozzle unit is good; And
And a scarping step of scaping the bipartite corner when it is determined that the position of the nozzle unit is good in the nozzle unit position determination step. 13. The method of claim 12,
The slip conveying step
Sensing an end of the casting entering the scarping position;
A width measuring step of stopping the casting and measuring the width and eccentricity of the casting when the entrance of the casting is detected in the entrance sensing step;
A proximity sensing step of transferring the slab relatively slowly after the width measuring step and detecting whether the leading end of the casting reaches the set proximity position before the scarping position; And
And moving the casting further to a set distance so that the leading end of the casting stops at the scarping position when the leading end of the casting is detected at the close position. 14. The method of claim 13,
Determining whether the main yarn is eccentric after the width measuring step, and correcting the eccentricity of the main casting by the calibrating device when it is determined that the main yarn is eccentric. 13. The method of claim 12,
The scarping step
An initial preheating step of performing preheating of the tip end edge of the cast steel at a relatively large injection angle by using the initial preheating jetting unit of the nozzle unit in the casting stop state;
And a main scarifying step of performing scarping of the billet edge at a relatively small spray angle using the main jetting unit of the nozzle unit during the feeding of the billet after the initial preheating step. 16. The method of claim 15,
Wherein the main scarping step controls a moving device that moves the nozzle unit so that the nozzle unit follows the corner of the casting, corresponding to the width or position of the screed casting. 16. The method of claim 15,
Wherein the scarping step performs the main scarping step after performing the initial preheating step for a set time. 13. The method of claim 12,
Wherein the step of determining the position of the nozzle unit determines whether the position of the nozzle unit is good based on the information of the sensing unit for sensing the position of the nozzle unit and the size and position information of the delivered casting.

KR1020150160818A 2015-11-17 2015-11-17 Device for scarfing slab, and control method thereof KR101755385B1 (en)

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