KR100490993B1 - Apparatus for restraining and removing edge dust of strip casting roll - Google Patents

Abstract

The present invention relates to a roll edge dust suppression and removal device of a sheet casting machine. The object of the present invention is to efficiently suppress and remove dust generated more from the edge portion of a roll that allows molten steel to be directly manufactured from sheet metal, In order to prevent hot band (HOT-BAND) occurring at the edge in advance.

Therefore, in order to achieve the object as described above, the present invention, the molten steel (M) to be injected while casting the cast steel (40) to the roll edge (E) (E ') of the sheet caster 10 so as to be spaced apart and in close contact. The main oil tank 52 to be installed, and the oil supply for supplying oil to the roll edge (E) (E ') while being in front of the main oil tank 52 is in close contact with the roll edge (E) (E') Dust removal means having a dust suppression means (50) having a member (54) and a knife (72) provided adjacent to the oil supply means (50) to be spaced and in close contact with the roll edge (E) (E ') ( 70) provides an apparatus for suppressing and removing edge dust of a sheet casting machine roll.

Description

Edge dust suppression and removal device for sheet caster rolls {APPARATUS FOR RESTRAINING AND REMOVING EDGE DUST OF STRIP CASTING ROLL}

The present invention relates to a twin roll sheet casting machine for producing ferrous and non-ferrous metals and their alloys directly in molten metal (STRIP), and more particularly, in the edge portion of the twin roll for producing molten steel directly into thin plate. By effectively suppressing and removing the generated dust, the edge of the sheet caster roll that can effectively prevent the hot band (HOT-BAND) phenomenon that the unsolidified molten steel of the cast from the edge of the cast slab flows to the outside It relates to a dust suppression and removal device.

In general, in the casting method of thin plate, slab is manufactured by continuous casting method through molten steel, and the continuous casting hot rolling method of manufacturing it into thin plate through rough rolling and finishing rolling, and directly injecting molten steel into the rotating twin roll There is a twin-roll type sheet casting method for manufacturing a thin plate directly without rolling the slab through the roll, the latter can be manufactured directly without going through a number of processes of continuous casting method, a considerable cost reduction and process in terms of cost There has been a study to reduce the

Thin plate casting machine 100 using such a known roll is shown in FIG.

That is, as shown in Figure 1, the molten steel (M) is supplied through the deposition nozzle 112 installed below the molten steel storage container 110 between the two rolls (120, 120 ') that rotate at a constant speed When the supplied molten steel M contacts the rolls 120 and 120 'to form a solidification angle, and as the rolls 120 and 120' rotate, the cast steel 140 is formed at the roll contact point. It is to be manufactured.

On the other hand, in the conventional sheet casting machine 100 as described above, the scale of oxidation of molten steel M, which is a contaminant generated on the surfaces of the rolls 120, 120 ', and Mn, which is an evaporation component in the molten steel, are oxidized to MnO. Brush roll deposited on the surface of the roll in the form of a layer, and slag and the like present on the hot molten steel react with each other to form a hard film, and adhered to the surface of the rolls 120 and 120 'to remove such a film. 150 and 150 'are installed to remove the film on the roll surface.

And, as shown in Figures 1 and 2, in the known conventional two-roll type sheet caster 100, the molten steel (M) is roll 120 (before the molten steel (M) is solidified and molded into the cast steel 140) In order to prevent leakage from the side of the barrel (120 ') to act as a dam using the edge dam 130, the gap between the roll 120, 120' and the edge dam 130, the molten steel (M) Leaks often occur.

Therefore, in order to prevent the leakage of such molten steel (M) and to prevent abrasion of the surface of the rolls 120 and 120 ′, the edge dam 130 includes BN, which is a compound of boron (B) and nitrogen (N). The BN has excellent durability against high temperature molten steel (M), good lubricity, and has a large contact angle with molten steel (M), thereby preventing the leakage of molten steel (M). It satisfies the characteristics of the dam 130 well.

However, in the conventional twin roll type sheet casting machine 100 as described above, wear of the edge dam 130 is inevitably generated during rotation of the rolls 120 and 120 ′, which are essentially generated for casting of cast steel. The same dust of the worn edge dam 130 is concentrated on the surface of the roll 120, 120 ', in particular, the edge portion of the roll, so that the molten steel (M) of the edge portion during the casting of the slab by the sheet casting machine 100 is solidified. To make it uneven.

Therefore, in the conventional sheet caster 100, the iron brush described above to remove such dust accumulated on the roll surface due to abrasion between the roll and the edge dam 130 during the rotation of the rolls 120 and 120 '. By rotating with a constant pressure in the same direction or the same direction as the rolls 120, 120 'while contacting the surface of the rotating rolls 120, 120' using the rolls 150, 150 '. Dust generated due to the wear of the edge dam 130, such as was removed.

However, in the dust removal method according to the edge dam wear by the conventional brush roll 150, 150 'as described above, as shown in Figure 1, by the brush roll 150, 150' The accumulated dust enters and accumulates between the brushes of the brush rolls 150 and 150 ', and the accumulated dust re-contaminates the rolls 120 and 120' when the brush rolls 150 and 150 'are rotated. In particular, there is a problem in that dust accumulated at the edges E and E 'of the rolls 120 and 120', which have the most friction with the edge dam 130, cannot be completely removed.

That is, since the contaminated dust accumulated on the brushes of the brush rolls 150 and 150 'is generated more intensively at the edge side of the rolls 120 and 120', which is the dust generating place, the dust of the edge portion is roll ( Hot band phenomenon that thins the solidified portion at the edge portion of the cast slab 140 is delayed while delaying the solidification of the edge-side molten steel M of 120 and 120 ', and in severe cases, The unsolidified slab molten steel inside causes a problem of developing from the edge of the thin slab to the bulging phenomenon.

The present invention has been made in order to improve the various problems as described above, the object of the present invention is to supply the oil to the roll edge that is most likely to generate dust due to wear during casting of the cast steel sheet caster occurs between the roll edge and the edge dam An object of the present invention is to provide an edge dust suppression apparatus for a sheet casting machine roll that suppresses dusts themselves.

In addition, another object of the present invention is to completely accumulate dust accumulated in the edge portion of the roll casting the cast slab and the roll edge portion such as BN due to the wear of the edge dam while solidifying the molten steel during casting of the molten steel through the sheet casting machine The present invention provides a device for removing the edge dust of a sheet caster roll, which can prevent the hot band phenomenon occurring at the cast slab edge.

The present invention as a technical configuration for achieving the above object, in the sheet casting machine is cast into a cast steel while the molten steel is injected between the twin roll and the edge dam solidified by the rotation of the roll,

Dust suppression means having a main oil tank installed to be spaced and in close contact with the edge of the roll, and an oil supply member which is installed in front of the main oil tank and in close contact with the roll edge and supply oil to the roll edge,

By providing the dust dust suppression and removal device of the sheet caster roll which is configured as dust removal means having a knife adjacent to the oil supply means spaced and in close contact with the roll edge.

Hereinafter, the configuration of the present invention in detail with reference to the accompanying drawings as follows.

Figure 2 is a schematic diagram showing the installation state of the edge dust suppression and removal device of the sheet caster roll according to the present invention, Figure 3 is a main configuration diagram showing the edge dust suppression means of the sheet caster roll of the present invention, Figure 4 (a) and (b) are the overall block diagram and schematic plan view which show the edge dust removal means of the sheet casting machine roll of this invention.

2 and 3 show the edge dust suppression and removal device 1 of the present invention sheet caster roll, the apparatus 1 of the present invention is largely dust suppression means 50 and dust removal means 70 It is divided into, but each of these configurations will be described in more detail as follows.

First, FIG. 2 and FIG. 3 show the dust suppression means 50. The dust suppression means 50 is a deposition nozzle of the storage container between the pair rolls 20, 20 'and the edge dam 30. FIG. The edges of the rolls 20 and 20 'of the sheet caster 10 are cast into the cast steel 40 while the molten steel M injected as 32 is solidified by the rotation of the rolls 20 and 20'. E) Main oil tank 52 which is installed so as to be spaced apart and closely contacted to (E '), and roll edge (E) while being installed in front of the main oil tank 52 in close contact with the roll edge (E) (E') An oil supply member 54 for supplying oil to E 'is provided.

Then, the main oil tank 52 of the oil supply member 50 is connected to the first cylinder 56 installed on the frame at the rear thereof to the roll edge (E) (E ') side when the cylinder 56 is operated. It is formed into a cylindrical shape configured to be in close contact and spaced apart.

On the other hand, the oil supply member 54 is formed of a sponge mounted inside the fixed end 58 formed integrally in front of the cylindrical main oil tank 52, the oil of the sponge in the fixed end 58 A plurality of openings 58a are formed to pass through and to supply the roll edges E and E '.

In addition, the sponge 54 is formed with a plurality of fine holes (54a) for the smooth supply of oil, the main oil tank 52 is connected to the oil reservoir 62 as a pipe 60 for oil supply In addition, an oil guide plate 64 for first supplying oil to the upper portion of the sponge 54 is mounted in the main oil tank 52.

Next, the dust removing means 70 is shown in FIGS. 2 and 4, and the dust removing means 70 is disposed on the roll edge E and E ′ adjacent to the oil supply means 50. A knife 72 is installed to be spaced apart and in close contact.

Then, the knife 72 of the dust removing means 70 is connected to the second cylinder 74 horizontally mounted on the support rearward roll roll (E) (E ') during operation of the second cylinder (74) It is integrally mounted to the distal end of the base 76 which is installed in close contact with and spaced apart.

On the other hand, the base 76 is mounted on one side in the vertical direction so that the knife 72 is directed in the reverse rotation direction of the roll, the inlet (76a) and the outlet (76b) for injecting the dust removed integrally in the front and bottom It is formed in the shape of a cube.

The first and second cylinders 56 and 74 of claim 2 or 4, which move the base 76 on which the main oil tank 52 and the knife 72 are mounted, are the oil tank (5). The fixed end 58 and the knife 72 of the 52 is made of a configuration connected to the control unit (C) so as to be in close contact with the roll edge (E) (E ') with a suitable force.

Referring to the operation and effects of the present invention made of the above configuration in detail as follows.

First, Figure 5 shows the dust density of the roll caster 10, the roll 20, 20 ', the dust generated by the wear of the edge dam 30 is the roll 20 (20') which is the dust generation place Since it is intensively generated at the edges (E) and (E ') of the side, it is necessary to remove more dust generated in this area than the center of the roll. As shown in FIG. 5, as shown in FIG. It can be seen that the dust density d1 of the roll edges (E) (E ') is considerably higher than the dust density d2 at the center portion. The difference in dust density determines the difference in the solidification angle thickness during solidification of the slab. It is necessary to remove dust so that dust density of (E) (E ') may be d2 or less, and to keep solidification of a cast steel uniformly.

In other words, as the casting progresses, the edge dam 30 continuously rubs with the sides of the rolls 20 and 20 ', thereby generating abrasive dust, and the abrasive dust generated at this time begins to accumulate on the surface of the roll edge. It is also partially integrated in the center portion, so that the dust density in the center portion of the rolls 20 and 20 'is initially close to zero as do, but gradually increases to a constant level as d2 as it is accumulated little by little.

At this time, the roll edge (E) (E ') represents the difference in the solidification angle thickness by the difference from the integration density d2 of the center portion of the roll as the integration density increases to d1, and eventually solidification of the slab 40 formed on the roll edge The angle becomes relatively thin, resulting in a hot band phenomenon where the edge of the slab 40 becomes thinner and brighter than normal, for example, the dust density d1 at the roll edge identified during casting is maximum. It can be seen that about 200 mg / cm 2 is accumulated on the roll surface.

That is, since the accumulated dust density is small at the beginning of casting, the hot band phenomenon does not appear well, but after the middle of the casting, the dust density is somewhat higher and gradually becomes hot-band at the edge of the slab 40. The phenomenon appears.

As a result, the solidification angle development at the roll edge E (E ') is promoted only when the dust density d1 integrated at the roll edge E (E') is kept smaller than the dust density d2 at the center portion, which is hot- It is to suppress the occurrence of band phenomenon.

Accordingly, if there is a distribution of dust density during casting of the cast steel 40 of the sheet casting machine 10, the concentration is concentrated on the roll edge E (E ') side to make it uniform in the width direction of the cast steel 40. The sheet casting machine roll of the present invention suppresses dust generation by supplying oil to reduce the wear of the rolls 20, 20, edges E, E 'and the edge dams 30 to efficiently remove dust. Edge dust suppression and removal device 1 is as follows.

First, the dust suppression action to suppress the roll edge dust of the present invention, as shown in Figures 2 and 3, the molten steel (M) ladle between the pair of rolls 20, 20 'and the edge dam 30 When the cast steel 40 is cast while being injected through the nozzle 32 and solidified by the rotation of the rolls 20 and 20 ', the roll edges E and E' are installed on a frame (not shown) at the rear. By the forward operation of the first cylinder 56, the main oil tank 52 is advanced and in close contact.

Accordingly, the oil is roll roll (E) (E ') through the oil supply member 54 which is a sponge mounted inside the fixed end 58 integrally formed in front of the main oil tank 52 formed in a cylindrical shape. The wear between the edges (E) and the edge dams (30) of the rolls (20, 20 ') is reduced, which in turn suppresses dust generation due to wear of the edge dams (30). In particular, it is to suppress the generation of dust on the roll edge (E) (E '), where dust is most accumulated.

In this case, a plurality of openings 58a are formed in the fixed end 58 to allow oil flowing through the plurality of micropores 54a formed in the sponge 54 to be supplied to the roll edges E and E '. In this case, it is important to install the main oil tank 52 to the rear of the edge dam 30 in which the roll reaches one revolution after casting, which is because the roll edge is cooled in the air. The thermal deformation of (50) can be avoided, and in particular, the oil can be supplied before the casting bar to further reduce wear.

On the other hand, the main oil tank 52 is connected to the oil reservoir 62 as a flexible pipe 60 for supplying oil, the oil guide plate 64 is installed inside the main oil tank 52, the storage tank The oil through the 62 and the flexible pipe 60 flows down from the top of the sponge 54 to facilitate the oil supply to the roll edges E and E '.

Next, looking at the dust removal action of the roll edge (E) (E ') by the present invention dust removal means 70, as shown in Figure 2 and 4, the oil roll in the dust suppression means 50 When the second cylinder 74 horizontally mounted on the support is operated backward at the edge of the edge dam 30 at the point supplied to the edge, the base 76 moves forward integrally when the second cylinder 74 is advanced. Knife 72 mounted on the tip portion is in close contact with the roll edge (E) (E ') to remove the accumulated dust.

At this time, the base 76 is formed in a hexahedral cylindrical shape through the inlet (76a) formed in front of the knife 72 vertically mounted in the inlet (76a) to face the reverse rotation direction of the roll so as to be in close contact with the roll edge When the dust removed from the inflow into the base 76 is discharged through the discharge hole (76b) formed in the lower portion of the base 76 is integrally or separated to the lower side of the base 76 to be horizontally disposed on the support object The dust is collected in the collection tank 80.

As a result, during casting of the slab by the sheet casting machine 10 as described above, the oil is supplied to the roll edge, and the dust accumulated on the roll edge adjacent thereto is removed, so that the dust on the roll edge E (E ') is removed. This is effectively suppressed and eliminated, which prevents solidification imbalance of the slab edges due to dust and thus prevents hot-band phenomenon at the slab edges.

At this time, the first and second cylinders 56 and 74 for moving the main oil tank 52 and the base 76 on which the knife 72 is mounted are connected to the control unit C, so that the oil tank 52 It is preferable that the stroke of the cylinder, that is, the stroke of the cylinder, is adjusted so that the fixed end 58 and the sponge 54 and the knife 72 do not come into close contact with the roll edges E and E '. Do.

As described above, according to the present invention, the edge dust suppression and removal apparatus of the thin sheet casting machine roll uses the dust suppression and removal apparatus for dust generated at the roll edge during sheet casting to reduce the dust density of the roll edge portion to be smaller than the roll center portion. There is an advantage of effectively preventing the hot-band generation of the edge portion of the slab, which is one of solidification non-uniformities generated when the slab solidification is not completely done.

In addition, by supplying oil to the roll edge, which is most prone to dust generation due to abrasion during casting of cast steel sheets, it suppresses the dust itself generated between the roll edge and the edge dam, thereby preventing product defects during thin sheet casting due to dust. There is an excellent effect that can be done.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

1 is a schematic view showing a typical double roll type sheet casting machine

Figure 2 is a schematic diagram showing the installation state of the edge dust suppression and removal device of the sheet caster roll according to the present invention

Figure 3 is a main part configuration showing the edge dust suppression means of the present invention sheet caster roll

Figure 4 (a) and (b) is an overall configuration and schematic plan view showing the edge dust removal means of the present invention sheet caster roll

5 is a schematic graph showing a dust distribution diagram of a sheet casting machine roll;

Explanation of symbols on the main parts of the drawings

1 .... dust suppression and removal device 10 .... sheet casting machine

20,20 '.... Pair 30 .... Edge Dam

40 .... Cast 50 .... Dust suppression means

52 .... Main oil bath 54 .... Oil supply

56, .. Cylinder 62 .... Oil reservoir

64 .. Oil guide plate 70 ... Dust removal means

72 .. Knife 72a, 72b .... Dust oil, exit

Claims (5)

The molten steel (M) injected between the twin rolls (20, 20 ') and the edge dam (30) is solidified by the rotation of the rolls (20) and (20') to the sheet casting machine (10) cast into the cast steel (40). In Main oil tank 52 is installed to be spaced apart and in close contact with the edge (E) (E ') of the roll (20, 20'), and roll edge (E) is installed in front of the main oil tank 52 Dust suppressing means 50 having an oil supply member 54 for supplying oil to the roll edges E and E 'while being in close contact with E', and Edge of the sheet caster roll, characterized in that it is configured as dust removal means 70 having a knife 72 adjacent to the oil supply means 50 so as to be spaced apart and in close contact with the roll edges E'E '. Dust suppression and removal device The main oil tank (52) of the oil supply member (50) is connected to a first cylinder (56) installed on a frame at a rear side thereof, so that the roll edge (E) (in operation) is operated. E ') is formed in a cylindrical shape configured to be in close contact and spaced apart, the oil supply member 54 is a sponge mounted inside the fixed end 58 formed integrally in front of the cylindrical main oil tank 52 And a plurality of openings 58a are formed in the fixed end 58 to allow the oil of the sponge to pass and to supply the roll edges E and E '. Removal device According to claim 2, The sponge 54 is formed with a plurality of fine pores (54a) for the smooth supply of oil, the main oil tank 52, the oil reservoir 62 as a pipe 60 for supplying oil ) Is connected, and the oil guide plate 64 for supplying oil to the upper portion of the sponge 54, the inside of the main oil tank 52 is installed, the edge dust suppression and removal device of the sheet caster roll The method of claim 1, wherein the knife 72 of the dust removing means 60 is connected to the second cylinder (74) horizontally mounted on the support to the rear of the roll edge (E) during operation of the second cylinder (74) Integrally attached to the distal end of the base 76 which is installed to be in close contact with and spaced apart from (E '), The base 76 has an inlet (76a) and an outlet (76b) integrally formed in the front and the lower portion of the inlet (76a) and the inlet (76b) for injecting the dust removed and mounted on one side in the vertical direction so that the knife 72 to the reverse rotation direction of the roll Edge dust suppression and removal device for sheet caster rolls, characterized in that formed in the shape of a cube 5. The oil tank 52 according to claim 2 or 4, wherein the first and second cylinders 56 and 74 which move the main oil tank 52 and the base 76 on which the knife 72 is mounted. Edge dust suppression and removal device of the sheet caster roll, characterized in that the fixed end 58 and the knife 72 is connected to the control unit (C) to be in close contact with the roll edge (E) (E ') with a suitable force.