KR100584750B1 - An apparatus for removing the scale on a surface of roll in twin roll strip caster - Google Patents

Abstract

The present invention relates to an apparatus for removing scale from the cast roll surface of a twin roll sheet caster.

The present invention is installed in the roll length direction so as to adsorb foreign substances dropped by the brush roll (9) or remaining on the surface of the casting roll to the outer peripheral surface by a magnetic force, between the brush roll (9) and the manikus shield (6) Magnetic roll 91 disposed at a predetermined distance (G) with a casting roll (3) (3a) to rotate in one direction, and the tip portion in the roll length direction to remove foreign matter adsorbed on the outer surface of the magnetic roll (91) The roll chamber in which the dropping member 95 installed in the lower opening 94 of the roll chamber 93 rotatably supporting the roll shaft of the magnet roll and the foreign matter dropped from the magnet roll 91 are accumulated. Including an inhaler 97 for transmitting the suction force to the lower channel 96 of the 93 to externally discharge the foreign matter dropped out, when the casting, fine foreign matter, such as the slab surface oxide is attached to the casting roll surface and localized to the solidification interface It acts as a coagulation non-uniformity The so as not to generate a magnetic force, and absorption, to improve the dust-collecting process it can then eliminated the foreign matter adsorbed twin roll relates to the casting roll surface descaling unit of sheet metal casting machine.

Double Roll Sheet Casting Machine, Brush Roll, Magnetic Roll, Roll Chamber, Suction Machine

Description

Cast roll surface descaling device for twin roll sheet casting machine {AN APPARATUS FOR REMOVING THE SCALE ON A SURFACE OF ROLL IN TWIN ROLL STRIP CASTER}

1 is a schematic view showing a typical twin roll sheet casting machine,

Figure 2 is a detailed view of the foreign matter remaining on the surface of the casting roll of a typical twin roll sheet casting machine,

3 is a working state of brushing foreign matter on the roll surface as a brush roll employed in a general twin roll sheet caster,

Figure 4 is a state diagram showing the casting roll surface descaling apparatus of the twin-roll sheet caster according to the present invention,

5 is a cross-sectional view showing a cast roll surface descaling apparatus of a twin roll thin caster according to the present invention;

Figure 6 is a perspective view showing a cast roll surface descaling apparatus of a twin-roll sheet caster according to the present invention.

Explanation of symbols on the main parts of the drawings

3,3a ... Casting Roll 6 ..... Manikus Shield

9 ..... Brush Roll 13 .... Bristol

91 .... Magnet Roll 91a ... Roll Shaft

93 .... Roll chamber 94 .... Lower opening

95 .... Falling member 96 .... Lower channel

97 .... inhaler G ..... interval

The present invention relates to an apparatus for removing scale from the cast roll surface of a twin roll sheet caster, and more particularly, when a fine foreign material such as an oxide of a slab surface adheres to the cast roll surface during casting, it acts as a localized solidification unevenness on the solidification surface. The present invention relates to a descaling device for a cast roll surface of a twin roll sheet caster, which is adsorbed by magnetic force so as not to cause cracks in a cast steel, and the dust adsorbed after dropping adsorbed foreign substances.

In general, the twin roll continuous sheet caster 100 is as shown in Figure 1, between the casting rolls (3) (3a) to rotate in the opposite direction while the inside of the molten steel (2) supplied from the nozzle (1) is water-cooled It is an apparatus for manufacturing the cast (5) directly by passing through. The quality and shape of the cast piece 5 in such a casting machine depends largely on the conditions of initial solidification at the surface / roll contact at which solidification is initiated.

That is, the main factors related to the initial solidification interface 4 include the surface conditions of the casting rolls 3 and 3a, the composition of the atmospheric gas at the solidification interface, the molten steel state, and the like. The condition of the surface of the casting roll (3) (3a) to obtain is to form an appropriate surface roughness that can effectively disperse cracks due to the thermal stress accompanying solidification, and the molten steel on the surface of the casting roll (3) (3a) There should be no foreign material that delays coagulation.

Herein, the atmospheric gas condition may adversely affect the formation of sound slabs while acting as a solidification non-uniformity in the coagulation interface when a large amount of foreign matter (for example, atmospheric gas pollution due to evaporation of Mn when casting steel containing Mn) is included. Is given. In particular, when a problem arises in the sealing of the atmosphere of the hot water surface and the oxidizing gas such as general air occupies a certain level or more in the hot water surface, hot molten steel is easily oxidized to form an oxidative scum on the molten steel water surface. When it is introduced into the slab is mixed into the cast steel to cause cast defects and excessive roll repulsion force, resulting in a large adverse effect on the quality of the cast steel.

Therefore, most of the twin-roll continuous sheet casting machine 100 has been made various efforts to secure a stable solidification interface.

First, in order to secure an inert atmosphere at the hot water surface of the molten steel pool formed between the casting rolls 3 and 3a and an edge dam not shown, a manifold shield 6 which can generally seal the hot water surface is installed. In general, the inert gas atmosphere is maintained in the inner space so that the molten steel supply nozzle 1 can be sealed in the inserted state.

In this case, a method of blowing the inert gas through the upper side or the side surface of the circus shield 6 is used. For this purpose, a gas supply nozzle 8 is installed on the upper surface of the circus shield 6. The sealing between the main roll (3) (3a) and the manikus shield (6) was to install the sealing curtain (7) on the roll to maintain the airtight.

On the other hand, it is found that it is desirable to form a roll surface roughness of an appropriate size on the outer circumferential surface of the casting roll (3) (3a) in order to effectively distribute the thermal stress accompanying the solidification, so that the roll by the shot blasting method, etc. There are numerous devices and designs for imparting roughness to the surface, and the brush rolls generally used to remove foreign substances generated on the casting rolls (3) and (3a) are also disclosed in Japanese Patent Laid-Open No. 5-177311. Many methods for driving brush rolls, contacting methods and brushing methods have been devised, as in Japanese Patent Application Laid-Open No. 5-174203.

The main function of the brush roll 9 disposed on the outer circumferential surface of the casting rolls 3 and 3a is a foreign substance whose main component is attached to the dimple 12 formed on the surface of the casting rolls 3 and 3a. It is known that selection of an appropriate bristle size and material is important as removing the through the bristle 13 of the brush roll 9 in contact with the casting roll 3, 3a surface.

On the other hand, in order to keep the surface of the casting roll (3) (3a) clean, generally use a brush roll 9, there is a problem as follows.

First, the strength of the bristle 13 in contact with the outer circumferential surface of the casting roll (3) (3a) is a problem, if the degree of surface adhesion between the brush roll 9 and the casting roll (3) (3a) is large or When the coarse and strong bristle 13 is used, it inevitably affects the dimple roughness formed on the surface of the casting rolls 3 and 3a.

In other words, if the surface of the casting roll (3) (3a) is worn by the brush roll (9) during the casting damage is damaged, the thermal stress is not smoothly resolved during the solidification of molten steel, if the damage is large cast A crack is generated in (5), and it has a big bad influence on operation and manufacturing cost, such as having to regrind a roll.

Another problem is related to the effective removal of foreign matter dropped by brushing the brush roll (9).

That is, foreign matters removed from the surface of the casting rolls 3 and 3a through the brush roll 9 are collected by the dust collector installed on or adjacent to the brush roll 9 itself. However, through the brush roll 9, it is possible to effectively remove foreign matters of a predetermined size (several mm) attached to the surface of the casting rolls 3 and 3a with a certain amount of adhesion. (3a) If the fine particles (1 ~ 100㎛ size) present on the surface is not easy to remove, because the foreign matter, which is a fine particle is considerably light, and after contact with the bristle 13, the brush roll (9 This is because it does not have a stable dust collecting device installed in the central dust collector or its upper part.

In FIG. 2, the iron-based foreign matter having a fine particle size in the dimples 12 formed on the roll surface is distributed after the surface of the casting roll 3 and 3a is brushed by the brush roll 9 before contacting the molten steel. The state is shown in detail, and as shown, fine foreign matter is present in both the acid and valley of the dimple formed on the surface of the casting roll 3 (3a).

3 shows a working state in which foreign matter existing on the surface of the casting rolls 3 and 3a is removed by the bristle 13 which is a hair member attached to the outer surface of the brush roll 9, Regardless of the rotation direction of the brush roll 9, it can be seen that foreign matters, which are fine particles, fly in the rotation direction of the casting rolls 3 and 3a.

Among the fine particles, the fine particles existing on the surface of the casting roll 3, 3a can be removed to some extent from the curtain used for the Meniscus Shield sealing, but the fine particles in the bone are removed. Since it is not easy, when foreign matter, which is a microparticle present in the valley of the dimple 12, comes into contact with molten steel, it acts as a kind of inclusion in the coagulation interface, causing non-uniform coagulation, and thus on the cast slab surface. There is a possibility of causing cracks.

As mentioned above, as the number of microparticles increases, the probability of occurrence of slag cracking by foreign matters that are fine particles increases. When casting cast steel with a thick plate thickness, the rotational speed of the casting rolls 3 and 3a becomes slow. More time is required for the fine particles to accumulate on the surface, thereby increasing the frequency of cast defects.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of which is not completely removed by the brush roll rotated in contact with the outer surface of the casting roll, fine scales and the like present on the surface of the casting roll Casting roll of twin roll sheet casting machine which adsorbs by magnetic force, forcibly removes the adsorbed foreign substances and collects them to form sound solidification interface between molten steel and casting roll during sheet casting. To provide a surface descaling device.

As a technical configuration for achieving the above object, the present invention

A molten steel pool is formed between the edge dam and the molten steel is filled, and a pair of casting rolls rotated in different directions and a brush roll brushing the foreign material on the roll surface as bristle contacting the outer circumferential surface of the casting roll are provided. In the apparatus for casting,

It is installed in the roll length direction so as to adsorb foreign substances dropped by the brush roll or remaining on the surface of the casting roll to the outer circumferential surface by a magnetic force, and is disposed between the brush roll and the manikus shield at a predetermined distance from the casting roll and rotated in one direction. A magnetic roll driven,

A dropping member provided at a lower opening of a roll chamber in contact with a leading end in a roll length direction to remove foreign matter adsorbed to an outer surface of the magnet roll, and rotatably supporting a roll shaft of the magnet roll;

In order to provide a cast roll surface descaling apparatus of a twin-roll sheet caster, characterized in that it comprises an inhaler for transferring the suction force to the lower channel of the roll chamber in which the foreign matter dropped from the magnetic roll is accumulated to discharge the foreign matter dropped out. By.

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

4 is an installation state diagram showing the cast roll surface scale removing apparatus of a twin roll sheet caster according to the present invention, Figure 5 is a cross-sectional view showing a cast roll surface scale removing apparatus of a twin roll sheet caster according to the present invention, 6 is a perspective view showing a cast roll surface descaling apparatus of a twin-roll sheet caster according to the present invention.

4 to 6, the apparatus 90 of the present invention is driven by the brush roll 9 arranged so that the outer circumferential surface of the casting rolls 3 and 3a and the bristle 13 which is a hair member come into contact with each other. Left and right ends of each of the meniscus shield 6 and the respective casting rolls 3 so as to completely remove the scales, which are foreign matters of fine particles remaining or brushed and scattered on the valleys of the dimples 12 on the roll surface, without being removed. Arranged between the brush roll 9 provided in the) 3a, the apparatus 90 is composed of a magnet roll 91, a dropping member 95, an inhaler 97, and the like.

That is, the magnetic roll 91 is brush particles (9) or fine particles of fine particles that are brushed and scattered by the brush roll (9) having a bristle (13) in contact with the outer peripheral surface of the casting roll (3) (3a) It is equipped with a cylindrical permanent magnet member having a magnetic force of a certain strength so as to attract the foreign matter of the fine particles of the roll surface that did not fall off by the magnetic force to the external surface as a magnetic force.

In addition, the magnet roll 91 is spaced apart from the outer surface of each of the casting rolls 3 and 3a at a predetermined interval G, and is parallel to the casting rolls 3 and 3a and the brush roll 9. It is installed in the roll length direction so that the roll shafts 91a at both ends are rotatably assembled in the roll chamber 93 and rotated in one direction by the drive unit 80.

Here, the magnet rolls 91 installed for each of the casting rolls 3 and 3a are rotationally driven by the driving unit 80 in a direction to engage with the casting rolls 3 and 3a corresponding to each other one-to-one. 80 is a driven sprocket 81 mounted on the roll shaft 91a of the magnet roll 91 and a drive sprocket 83 mounted on the drive shaft of the drive motor 84 installed at one end of the roll chamber 93. Consists of a chain member 82 is connected between the transfer of the rotational driving force of the drive motor 84 to the magnetic roll (91).

The driving unit 90 is not limited thereto, and a belt or gear structure that transmits rotational power may be variously adopted.

In addition, the roll chamber 93 opens the lower opening 94 on the lower surface corresponding to the casting rolls 3 and 3a so that a part of the outer surface of the magnet roll 91 is exposed to the lower portion. 3) Rotatingly supporting the roll shaft of the magnet roll 91 to be fixedly installed in the longitudinal direction of (3a), and one side is configured to be open and close to allow replacement and repair of the magnet roll (91) good.

In addition, the dropping member 95 is provided to the roll chamber 93 so that the front end portion elastically contacts the outer circumferential surface and the entire longitudinal direction to forcibly remove the foreign matter attached to the outer circumferential surface of the magnet roll 91 by magnetic force. Is installed.

The dropping member 95 may be provided with a brush material for brushing and removing the foreign matter attached to the magnet roll 9 or a blade for removing scratches, and the foreign material attached to the outer circumferential surface of the magnet roll 91 may be provided. It is attached to the end of the inclined plate (93a) bent upwardly inclined to the lower surface of the roll chamber 93 so as to face the direction of rotation so that it is easy to drop off so that the front end portion is always in contact with the outer peripheral surface of the magnet roll (91).

Meanwhile, the inhaler 97 is a lower channel of the roll chamber 93 in which the magnetic roll 91 is accommodated so as to accumulate foreign substances forcibly dropped as the dropping member 95 from the outer circumferential surface of the magnetic roll 91. It is disposed vertically to 96, and is provided with a suction fan (not shown) for generating a suction force and a pipe member flanged as a hose member (97a), the lower end of the inhaler 97 is the lower channel (96) It is placed close to it so as to transmit suction power.

Accordingly, foreign substances such as scales collected by dropping and removing the lower channel 96 are externally discharged and dust-collected so as not to be reattached to the casting rolls 3 and 3a.

The work of removing the scale which is the foreign matter of the fine particle which cannot be removed by the brush roll 9 using the apparatus 90 which has the above-mentioned structure, and remains on the surface of the casting rolls 3 and 3a is the said casting. In the process of rotating the rolls 3 and 3a in different directions to cast the cast pieces, the brush rolls 9 provided in the respective casting rolls 3 and 3a are rotated as a driving source (not shown) to form a casting roll ( 3) (3a) Forcibly remove and remove foreign substances such as black skin attached to the surface.

At the same time, the magnet roll 91 disposed between the brush roll 9 and the manikus shield 6 is one-way, corresponding to the casting roll 3 by the driving motor 84 of the driving unit 80 provided at one end. The foreign matter, which is a fine particle that is not removed by the brush roll 9 while being rotated in the direction of engagement with the blade 3a, is adsorbed and removed as a magnetic force of the magnet roll 91.

At this time, the main component of the foreign matter, which is the fine particles, is iron oxide, and the iron oxide is formed on the surface of the hot slab that escapes the roll nip during casting, is peeled off during the transport of the slab, and is subjected to an upward airflow to the lower surface of the casting roll (3) (3a) In some cases, when the solidified portion of the dimple 12, which is a roll roughness, passes through the roll nip, an oxide film formed on the surface of the slab by shear force stays on the bone side of the dimple 12 during solidification. These fine iron-based particles have a magnetic force of an appropriate size, and are all adsorbed by the magnet roll 91 that maintains a proper distance from the casting roll (3) (3a).

Here, if the magnetic force of the magnet roll 91 is too weak or the gap G between the casting rolls 3 and 3a is too large, the magnetic force cannot be transmitted to the surface of the casting rolls 3 and 3a. Fine foreign particles are prevented from adhering to the outer surface of the magnet roll (91). Accordingly, as shown in Table 1 below, the distance G between the magnet roll 91 and the casting rolls 3 and 3a is most preferably about 2 to 5 mm.

On the other hand, iron-based fine particles, which are fine particles attached to the magnet roll 91 of the main species, continue to increase as the casting time increases, but the inclination plate 93a of the roll chamber 93 accommodating the magnet roll 91 increases. ), A dropping member 95, such as a brush or a braid, in which the outer circumferential surface and the tip of the magnet roll 91 are in close contact with each other is provided throughout the roll length direction, so that the magnetic roll 91 is attached to the magnet roll 91 by magnetic force. Particles are forced off by the interference of the dropping member 95 to the outer surface of the magnet roll 91.

Subsequently, foreign matter dropped from the magnet roll 91 is accumulated and gradually accumulated in the lower channel 96 installed under the roll chamber 93. At this time, since a plurality of inhalers 97 made of a pie member are installed in the upper portion of the lower channel 96, and the inhalers 97 are connected to a suction fan (not shown), the suction fan is generated when the suction fan is driven. The suction force to be delivered to the lower channel 96 to be forcibly sucked as a suction force foreign matter dropped by the dropping member 95 and accumulated in the lower channel 96 to be discharged to the outside.

Magnetic roll use Casting casting (mm) Casting speed (m / min) Magnetic Roll Magnetic Field (Oe) Magnetic roll and casting roll thickness (mm) Defects One X 2.1 110 - - Relatively small 2 X 3.4 45 - - plenty 3 O 2.1 110 200-500 2 ~ 5 Relatively low 4 O 2.1 110 1000-1500 2 ~ 5 none 5 O 3.4 45 200-500 2 ~ 5 none 6 O 3.4 45 1000-1500 2 ~ 5 none

 Table 1 shows the effect of the magnetic roll 91 on the cast defects according to the casting conditions in order to prove the effect of the magnetic roll to remove the fine particles, using the magnetic roll 91 in the table, the magnetic roll It can be seen that the defect of the cast piece does not occur when the distance G between the 91 and the casting rolls 3 and 3a is kept between 2 and 5 mm.

At this time, the diameter of the cast roll (3) (3a) used in the casting operation is 1250mm, the roll length is 1300mm, the cast steel produced is STS 304, the diameter of the magnet roll 91 was 200mm.

According to the present invention as described above, in the apparatus for continuously casting a thin plate using a double roll brushing foreign matter adhering to the roll surface in order to stabilize the solidification conditions at the initial solidification interface between the roll and molten steel during the initial solidification of molten steel By removing the foreign matters of the fine particles that are not removed at the time of removal by magnetic force, they are completely discharged to remove the fine foreign matters that adversely affect the initial solidification condition of molten steel from the roll surface. Obtained.

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 clarify that knowledge is easy to know.

Claims (6)

A pair of casting rolls 3 and 3a which are formed with molten steel filled with the molten steel between the edge dams and rotated in different directions, and a bristle which is in contact with the outer circumferential surface of the casting rolls 3 and 3a. 13) is a device for casting a cast steel having a brush roll (9) for brushing foreign matter on the roll surface, It is installed in the roll length direction to adsorb foreign substances dropped by the brush roll 9 or remaining on the casting roll surface to the outer circumferential surface by a magnetic force, and the casting roll between the brush roll 9 and the manikus shield 6 (3) (3a) and the magnetic roll 91 is disposed at a predetermined interval (G) to rotate in one direction, The dropping part provided in the lower opening part 94 of the roll chamber 93 which contact | abuts the front-end | tip part in the roll length direction so that the foreign material adsorb | sucked to the outer surface of the said magnet roll 91 may rotatably support the roll shaft of the said magnet roll 91 Member 95 and Twin roll type, characterized in that it comprises a suction unit 97 for transmitting the suction force to the lower channel 96 of the roll chamber 93, the foreign matter dropped from the magnet roll 91 is accumulated to discharge the foreign matter dropped out. Descaling device for casting roll surface of sheet casting machine. The method of claim 1, The magnet roll 91 installed in each of the casting rolls 3 and 3a is rotatably driven by the drive unit 80 in a direction to engage with the casting rolls 3 and 3a corresponding to each other one-to-one. Casting roll surface descaling device of casting machine. The method of claim 2, The drive unit 80 is a drive sprocket 81 mounted on the roll shaft 91a of the magnet roll 91 and a drive shaft mounted on the drive shaft of the drive motor 84 installed at one end of the roll chamber 93. Casting roll surface descaling device of a twin-roll sheet caster, characterized in that consisting of a chain member 82 is connected between the sprocket (83). The method of claim 1, The dropping member 95 is an end of the inclined plate 93a bent upwardly inclined upwardly to the lower surface of the roll chamber 93 so as to face the direction of rotation so that foreign matters attached to the outer circumferential surface of the magnet roll 91 are easily dropped. Casting roll surface descaling apparatus of a twin roll sheet caster, characterized in that mounted on. The method of claim 4, wherein  The dropping member (95) is a cast roll surface descaling device of a twin roll sheet caster, characterized in that consisting of a brush material for brushing and removing foreign matter attached to the magnet roll (9). The method of claim 4, wherein The dropping member (95) is a cast roll surface descaling device of a twin-roll sheet caster, characterized in that the blade is provided with a braid to remove the foreign matter attached to the roll (9).

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