WO2009084654A1 - タンディッシュノズル交換装置及びそれに用いるタンディッシュノズル - Google Patents
タンディッシュノズル交換装置及びそれに用いるタンディッシュノズル Download PDFInfo
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- WO2009084654A1 WO2009084654A1 PCT/JP2008/073779 JP2008073779W WO2009084654A1 WO 2009084654 A1 WO2009084654 A1 WO 2009084654A1 JP 2008073779 W JP2008073779 W JP 2008073779W WO 2009084654 A1 WO2009084654 A1 WO 2009084654A1
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- nozzle
- arm
- tundish
- distance
- lower nozzle
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
Definitions
- the present invention relates to a tundish nozzle changing device used in a continuous casting machine and a tundish nozzle used therefor, and more particularly to a device for changing tundish nozzles arranged in parallel at the bottom of the tundish and a tundish nozzle used therefor.
- the continuous casting machine used in the process of solidifying the molten steel to produce a semi-finished product while further removing the inclusions in the molten steel after the secondary refining, as shown in FIG.
- the tundish 52, the mold 53, the support roll 54, and a gas cutting machine (not shown) installed at the rear end are configured.
- the tundish nozzle used in this open injection method is made of a high-strength refractory such as zircon or zirconia, but since it is always subjected to chemical and mechanical action from molten steel, it melts and loses its diameter over time. However, it becomes impossible to maintain a predetermined casting speed due to enlargement or formation of deposits and clogging. For this reason, it is necessary to periodically replace the tundish nozzle, and an apparatus capable of replacing the tundish nozzle during casting operation has been developed (for example, see Patent Document 1 and Patent Document 2).
- the tundish nozzle is composed of an upper nozzle 57 installed in the bottom refractory of the tundish 52 and a lower nozzle 58 pressed and supported by the lower surface of the upper nozzle 57.
- the dish nozzle replacement device 56 is a device for replacing the lower nozzle 58.
- a lower nozzle 59 for the next replacement is arranged on the side of the lower nozzle 58 during the casting operation.
- the lower nozzle 58 during the pouring operation is pushed out from the pouring position, and the lower nozzle 59 for the next replacement is set at the pouring position.
- Japanese Unexamined Patent Publication No. 10-286658 Japanese Laid-Open Patent Publication No. 11-10293
- the tundish nozzle changing device includes a pair of arms that press and support the lower nozzle on the lower surface of the upper nozzle, and a sliding means that slides the lower nozzle (or a blank plate without holes) to the side.
- a pair of arms and sliding means will be juxtaposed, but in the case of a conventional tundish nozzle changer, the end of one arm that faces it Since the distance from the arm to the end of the other arm is about 300 mm, the distance between the holes of the tundish nozzle is required to be 300 mm or more simply by arranging them side by side.
- the distance between holes cannot be set to 250 mm or less even if the size of each part of the tundish nozzle exchange device is reduced.
- the present invention has been made in view of the above-described problems, and a tundish nozzle changing device capable of shortening the distance between holes of tundish nozzles arranged in parallel at the bottom of the tundish as compared with the conventional one, and a tundish nozzle used therefor.
- the purpose is to provide.
- the present invention provides an apparatus for replacing tundish nozzles arranged in parallel at the bottom of a tundish, wherein the first nozzle disposed on the bottom surface of the first upper nozzle installed at the bottom of the tundish is provided.
- a first arm that presses and supports one lower nozzle, and a second lower nozzle disposed on the lower surface of the second upper nozzle that is disposed on the bottom of the tundish adjacent to the first upper nozzle.
- a second arm to be supported, and the adjacent first arm and second arm are arranged so that at least a part thereof overlaps.
- each of the first arm and the second arm is provided with a fulcrum at the center thereof, and is urged by a protrusion formed on both sides of one end of the first arm.
- the other end portion of the first arm presses and supports the first lower nozzle, and is attached to the protruding portion formed on both sides of the one end portion of the second arm.
- the other end portion of the second arm is configured to press and support the second lower nozzle by the biasing means, and the protruding portion of the first arm is the protruding portion of the adjacent second arm. It is good also as a tundish nozzle exchange apparatus inserted in the recessed part formed in between.
- the first arm and the second arm are arranged so that at least a part of the adjacent first arm and the second arm overlap with each other, compared with the case where the first arm and the second arm are simply arranged in parallel.
- the interval between the line for exchanging the lower nozzle and the line for exchanging the second lower nozzle can be reduced.
- the distance between the holes of the tundish nozzle can be reduced as compared with the conventional case.
- the urging force acting on one end of the first arm is F 1 , and the distance from the force point at which the urging force acts to the fulcrum of the first arm X 1 , Y 1 is the distance from the fulcrum to the other end that presses and supports the first lower nozzle, and F 2 is the urging force acting on one end of the second arm.
- each distance is a distance in a direction orthogonal to the moving direction of the lower nozzle.
- a biasing force is applied to one end of the arm and the lower nozzle is pressed and supported by the other end of the arm according to the lever principle with the center of the arm as a fulcrum. is there.
- the power point of the first arm is arranged symmetrically with respect to the center line of the first arm
- the power point of the second arm is the second arm. It is preferable that they are arranged symmetrically with respect to the center line of the arm.
- the center line is an imaginary line that passes through the fulcrum of each arm and is orthogonal to the moving direction of the lower nozzle.
- the force point of the arm is arranged symmetrically with respect to the center line of the arm, so that the pressing force acts evenly on the lower nozzle.
- an upper nozzle and a lower nozzle in which an alumina refractory is wound around the outer periphery of the zirconia nozzle are used.
- a crack can be prevented.
- the zirconia nozzle can be made smaller, the upper nozzle and the lower nozzle can be made smaller, and the distance between the holes of the tundish nozzle can be made shorter than before.
- variety of the upper end surface of the said lower nozzle shall be 79 mm or more and 120 mm or less.
- the width of the upper end surface of the lower nozzle is a width in a direction orthogonal to the moving direction of the lower nozzle.
- the upper end surface of the lower nozzle is shorter, the distance between the holes of the tundish nozzle can be narrowed.
- the durability is lowered, and therefore, it is preferably 79 mm or more and 120 mm or less.
- the lower nozzle includes a blank plate without holes.
- the outer diameter of the upper nozzle which touches the upper end surface of the said lower nozzle shall be 100 mm or more and 200 mm or less. Since the outer diameter of the upper nozzle is restricted by the distance between the fulcrums of the arms, in order to shorten the distance between the holes of the tundish nozzle, it is necessary to shorten the distance between the fulcrums of the arms. Therefore, when the outer diameter of the upper nozzle exceeds 200 mm, the distance between the holes of the tundish nozzle becomes long. On the other hand, when the outer diameter of the upper nozzle is less than 100 mm, a sufficient area for receiving the lower surface of the upper nozzle with the frame cannot be secured, and there is a risk that the upper nozzle is displaced during use.
- the present invention is an apparatus for exchanging tundish nozzles arranged in parallel at the bottom of a tundish, wherein the first arm and the second arm adjacent to each other are arranged so that at least a part of the first arm overlaps, Compared with the case where the arm and the second arm are simply arranged in parallel, the distance between the line for exchanging the first lower nozzle and the line for exchanging the second lower nozzle can be reduced. As a result, the distance between the holes of the tundish nozzle can be reduced as compared with the conventional case.
- the zirconia nozzle is used during use by using the upper nozzle and the lower nozzle in which the alumina refractory is wound around the outer periphery of the zirconia nozzle. Even if a crack occurs in the quality nozzle, the crack can be prevented. As a result, since the zirconia nozzle can be reduced, the upper nozzle and the lower nozzle are reduced, and the distance between the holes of the tundish nozzle can be further reduced.
- FIG. 2 is a partial cross-sectional perspective view taken along line AA in FIG. 1. It is a longitudinal cross-sectional view of the tundish nozzle part used for the tundish nozzle exchange apparatus which concerns on one Example of this invention. It is the bottom view and longitudinal cross-sectional view of the upper nozzle which comprise the tundish nozzle.
- (A) is an upper end view and a longitudinal sectional view of the lower nozzle, and (b) is an upper end view and a longitudinal sectional view of the blank plate.
- (b) is a top view which shows the tundish nozzle replacement
- the side of the arm that contacts the lower nozzle will be referred to as “front” and the opposite side as “rear” for convenience.
- the directions “up” and “down” are based on the assumption that the tundish nozzle changing device is installed on the bottom surface of the tundish.
- the tundish nozzle changing device 1 includes four bolts on a base plate 14 fixed to the bottom surface of the tundish via a frame 18 of the device. 19 is attached. As shown in FIG. 3, two openings are formed adjacent to each other at the center of the base plate 14 and the frame 18. The first upper nozzle 22 is formed in one opening and the other opening is formed in the other opening. The second upper nozzles 23 are respectively inserted. For this reason, the two openings are formed so that the adjacent spouts 20 and 21 provided at the bottom of the tundish and the holes of the first upper nozzle 22 and the second upper nozzle 23 respectively match. ing.
- a pair of first nozzles that press and support the second lower nozzle 3 disposed on the lower surface of the second upper nozzle 23 are disposed at the peripheral edge portion of the second opening 18b into which the second upper nozzle 23 is inserted.
- Two arms 7 are disposed on the frame 18 so as to face each other.
- a pair of guide plates 16, 16 disposed opposite to each other to guide the replacement lower nozzle 5 to the second arms 7, 7 are provided on the sides of the pair of second arms 7, 7. It is installed in parallel with the guide plates 15 and 15.
- a second hydraulic cylinder 9 for pushing the replacement lower nozzle 5 toward the second arms 7, 7 is provided with the first hydraulic cylinder 8. Installed in parallel.
- the lower nozzles 2, 3, 4, and 5 have a shape in which the upper half has a square shape, the lower half has a cylindrical shape, and the upper half protrudes laterally.
- the lower nozzles 2, 3, 4, and 5 are supported by the guide plates 15 and 16 from below and the side portions projecting sideways are pushed out sideways, and are pushed out by the first arm 6 or the second arm 7. It is pressed and supported by the lower surfaces of the upper nozzles 22 and 23.
- the structure and shape of the upper nozzle and the lower nozzle will be described later in detail.
- the first arm 6 has a rectangular shape in plan view, and projecting portions 6a projecting rearward are formed on both sides of the rear end portion. And the center part and the protrusion part 6a of the 1st arm 6 are connected with the flame
- the second arm 7 has a trapezoidal shape in plan view, and projecting portions 7a projecting rearward are formed on both sides of the rear end portion. And the center part and the protrusion part 7a of the 2nd arm 7 are connected with the flame
- the pins 10 and 12 are provided with spherical seats 10 a and 12 a at positions where they come into contact with the first arm 6 and the second arm 7.
- the arm 7 is rotatable in a vertical plane.
- a compression coil spring 17 is wound around the pins 11 and 13, and the protrusions 6a and 7a of the first arm 6 and the second arm 7 are connected to the frame 18 in a state having play in the vertical direction.
- the compression coil spring 17 is a biasing means that biases the protrusions 6a and 7a of the first arm 6 and the second arm 7 downward.
- the first arm 6 and the second arm 7 The front end portions 6b and 7b respectively press and support the square portions of the first lower nozzle 2 and the second lower nozzle 3 upward from below.
- the second arm 7 is thicker than the first arm 6, and a recessed portion 7 c that opens rearward and open is formed on the rear end surface of the second arm 7, and the protruding portion 6 a of the adjacent first arm 6 is formed. However, it is inserted in the recessed part 7c opened rearward so that the pin 12 which is a fulcrum of the 2nd arm 7 may be pinched
- interval of the line which replaces the 1st lower nozzle 2 and the line which replaces the 2nd lower nozzle 3 is narrowed. be able to.
- the adjacent first arm 6 and second arm 7 are in contact with each other with a clearance, and the movement of the first arm 6 and the movement of the second arm 7 do not interfere with each other.
- F 1 a biasing force that acts on the position of the pin 11 of the first arm 6, the distance from the pin 11 to which the urging force is applied to the pin 10 of the first arm 6 X 1 , the distance from the pin 10 to the front end surface of the front end 6b that presses and supports the first lower nozzle 2 is Y 1, and the urging force acting on the position of the pin 13 of the second arm 7 is F 2 ,
- the distance from the pin 13 on which the biasing force acts to the pin 12 of the second arm 7 is X 2
- the distance from the pin 12 to the front end surface of the front end 7b that presses and supports the second lower nozzle 3 is Y 2 .
- each distance is a distance in a direction orthogonal to the moving direction of the lower nozzles 2, 3, 4, and 5.
- the actual pressing force acting on the front end 6b of the first arm 6 and the front end 7b of the second arm 7 is preferably within ⁇ 10% of the set value.
- the width of the front end 6b of the first arm 6 and the front end 7b of the second arm 7 should be equal to or greater than the width of the upper end surface of the lower nozzles 2 and 3 in order to press the lower nozzles 2 and 3 as evenly as possible. It ’s fine.
- X 1 and X 2 are 40.5 mm
- Y 1 and Y 2 are 32.5 mm
- P 1 and Q 1 are 40 mm
- P 2 and Q 2 are 80 mm, respectively.
- the urging forces F 1 and F 2 are calculated from the coil spring constant of the compression coil spring 17 to be used.
- the coil spring constant of each compression coil spring 17 is 400 N / mm
- the widths of the first arm 6 and the second arm 7 in the direction orthogonal to the moving direction of the lower nozzles 2 and 3 are 90 mm, respectively.
- the total width in which a part of the second arm 7 is overlapped is 110 mm, and the overlap size of the lower nozzles 2 and 3 at the front end portions 6b and 7b of the arms 6 and 7 is 10 mm.
- the distance between the holes of the tundish nozzle can be set to 190 mm.
- the width of the upper end surfaces of the lower nozzles 2 and 3 in the direction orthogonal to the moving direction of the lower nozzles 2 and 3 is 100 mm.
- the lower nozzles 4 and 5 for replacement are disposed on the side of the lower nozzles 2 and 3 during the casting operation. Is set, and the hydraulic cylinders 8 and 9 are operated to push the replacement lower nozzles 4 and 5 toward the arms 6 and 7. As a result, the replacement lower nozzles 4 and 5 are guided by the guide plates 15 and 16 and moved directly below the upper nozzles 22 and 23, and the lower nozzles 2 and 3 during the casting operation are replaced with the lower nozzles 4 and 5 for replacement. Is pushed to the side.
- the first lower nozzle 2 and the second lower nozzle 3 can be replaced at the same time, or only one of them can be replaced. At this time, as described above, the adjacent first arm 6 and second arm 7 are in contact with each other with a clearance, so that the movement of one arm is not restricted by the other arm. .
- a hole is replaced in place of the replacement lower nozzles 4 and 5 except when the lower nozzles 2 and 3 are replaced.
- a blank plate may be set.
- FIG. 4 shows a longitudinal section of a tundish nozzle portion used in the tundish nozzle changing device according to the present invention
- FIGS. 5 and 6 show shapes of an upper nozzle, a lower nozzle, and a blank plate, respectively.
- the first lower nozzle 2 and the first upper nozzle 22 will be described, but the same applies to the second lower nozzle 3 and the second upper nozzle 23.
- the first lower nozzle and the first upper nozzle are simply referred to as the lower nozzle and the upper nozzle.
- the lower nozzle 2 and the upper nozzle 22 are wound with alumina refractories 2b and 22b around the outer periphery of the zirconia nozzles 2c and 22c, and further the alumina refractories 2b and 22b. It is possible to use the one whose periphery is covered with the metal cases 2a and 22a. With such a structure, even if cracks occur in the zirconia nozzles 2c and 22c during use, the cracks can be prevented. In addition, since the outer diameters of the zirconia nozzles 2c and 22c can be reduced, the upper nozzle 22 and the lower nozzle 2 become compact. As a result, the contact area between the upper nozzle 22 and the lower nozzle 2 is reduced, and the first arm 6 that presses the lower nozzle 2 (the same applies to the second arm 7). Can be reduced.
- the outer periphery of the zirconia nozzles 2c and 22c and the metal cases 2a and 22a Castable can be cast between the two.
- the castable material preferably has an Al 2 O 3 content of 80% by mass or more from the viewpoint of strength and thermal shock resistance.
- the nozzle holes 2d and 22d of the lower nozzle 2 and the upper nozzle 22 need to ensure a certain size in order to ensure the molten steel flow rate.
- the thickness of the zirconia nozzles 2c and 22c must be reduced.
- the ZrO 2 content in the zirconia nozzles 2c and 22c is 75% by mass or more, more preferably 90% by mass or more. When the ZrO 2 content is less than 75% by mass, the melting loss during use increases, and it is difficult to reduce the thickness of the zirconia nozzles 2c and 22c.
- the width W1 of the upper end surface of the lower nozzle 2 and the blank plate 4a is shortened. It is effective.
- the width W1 of the upper end surfaces of the lower nozzle 2 and the blank plate 4a is a width in a direction orthogonal to the moving direction of the lower nozzle 2 and the blank plate 4a.
- the shorter the width W1 of the upper end surface of the lower nozzle 2 and the blank plate 4a the narrower the distance between the holes of the tundish nozzle can be.
- the width is too narrow, the durability deteriorates. Further, 79 to 110 mm is more preferable.
- the overhang width H of the upper part of the lower nozzle 2 must be at least 10 mm, the nozzle hole D must be at most 25 mm, the thickness K of the lower end of the zirconia nozzle 2c must be at least 7 mm, and the thickness J of the alumina refractory 2b must be at least 10 mm. There is.
- the lower limit value of the width W1 of the upper end surface of the lower nozzle 2 is 79 mm (see FIG. 4).
- the width W1 of the upper end surface of the lower nozzle 2 exceeds 120 mm, the contact area between the upper nozzle 22 and the lower nozzle 2 increases, and therefore the first arm 6 (second arm 7) that presses the lower nozzle 2 is increased. It is also necessary to increase the distance between the holes of the tundish nozzle to 250 mm or less.
- the metal case 22a has a cylindrical shape, but the portion exposed downward from the metal case 22a has a rounded corner. That is, the upper nozzle 22 has a cylindrical shape, and the bottom surface has a quadrangular shape with rounded corners in plan view, but the length of the diagonal line of the rectangular portion is substantially the same as the outer diameter of the cylindrical portion.
- the distance between the holes of the tundish nozzle is affected by the installation positions of the fulcrums (pins) 10 and 12 that support the arms 6 and 7.
- the distance between the fulcrums is also affected by the size of the upper nozzle 22. That is, in order to reduce the distance between the fulcrums, the outer diameter of the upper nozzle 22 must also be reduced. Therefore, in order to set the distance between the holes of the tundish nozzle to 250 mm or less, it is more preferable that the outer diameter of the upper nozzle 22 is 200 mm or less from the limitation of the size of each part.
- the distance between the supporting points of the arms 6 and 7 is 143 mm (exactly 142.5 mm), and the distance between the holes at this time is 190 mm. Therefore, in order to reduce the distance between the holes to 250 mm or less, the distance between the fulcrums of the arms 6 and 7 can be further increased to 60 mm, that is, 200 mm which is the maximum value of the outer diameter of the upper nozzle 22. In consideration of interference with the pins 10 and 12, which are fulcrums, 180 mm or less is more preferable. In the embodiment of the present invention, the outer diameter of the upper nozzle 22 is 120 mm.
- the upper nozzle 22 has a structure that is supported by the frame 18 by abutting the lower end surface of the upper nozzle 22 on the frame 18, and when the outer diameter of the upper nozzle 22 is reduced, Therefore, there is a risk that the upper nozzle 22 is displaced during use. For this reason, in order to stably support the upper nozzle 22 with the frame 18, a minimum of 10 mm is required on one side as a support allowance. Accordingly, since the minimum width W1 of the lower nozzle 2 is 79 mm, the outer diameter of the upper nozzle 22 needs to be 100 mm or more. When the upper nozzle 22 is a polygonal cylinder, the distance between the diagonal lines of the polygon is the outer diameter.
- first arm and the second arm will be described with reference to FIG.
- at least a part of the first arm and the second arm was in the same region in a plan view and a side view, but in this embodiment, at least one of the first arm and the second arm. The part is in the same region in side view.
- the first arm 36 has a rectangular shape in plan view, and projecting portions 36a projecting rearward are formed on both sides of the rear end portion. Further, the central portion and the protruding portion 36a of the first arm 36 are connected to the frame 18 by pins 30 and 31, respectively.
- the second arm 37 has an E shape in plan view, and the web portion 37b and both flange portions 37a are connected to the frame 18 by pins 32 and 33, respectively. In the recessed portion 37c formed by the web portion 37b and both flange portions 37a and opening rearward, in addition to the protruding portion 36a of the adjacent first arm 36, approximately 1 ⁇ 2 or more of the central portion has a clearance. It is inserted in the state.
- the first arm 46 is H-shaped in a plan view, and the web portion 46b and one flange portion 46a are connected to the frame 18 by pins 40 and 41, respectively.
- the second arm 47 is C-shaped in plan view, and the web portion 47b and both flange portions 47a are connected to the frame 18 by pins 42 and 43, respectively.
- One flange portion 46a and the web portion 46b of the adjacent first arm 46 are loosely fitted in a recessed portion 47c that is formed by the web portion 47b and both flange portions 47a and opens rearward.
- the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.
- the case where two nozzles are arranged in parallel has been described, but it is needless to say that three or more nozzles may be arranged in parallel.
- the shape of the arm is left-right symmetric, but it need not be left-right symmetric. In short, it is only necessary to obtain the desired function in the present invention.
- the present invention can be used in a continuous casting facility in which a tundish nozzle is provided in parallel at the bottom of the tundish. At that time, according to the present invention, the distance between the holes of the tundish nozzle can be shortened as compared with the conventional one.
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Abstract
Description
また、「少なくともその一部が重なり合う」とは、隣接するアーム同士が必ずしも接触している必要はなく、第一のアームと第二のアームの少なくとも一部が平面視及び/又は側面視で同じ領域にあれば良い。例えば、前記第一のアーム及び前記第二のアームは、各々その中央部に支点が設けられ、前記第一のアームの一方の端部の両サイドに形成された突出部に設置された付勢手段により、前記第一のアームの他方の端部が前記第一の下ノズルを押圧支持すると共に、前記第二のアームの一方の端部の両サイドに形成された突出部に設置された付勢手段により、前記第二のアームの他方の端部が前記第二の下ノズルを押圧支持する機構とされ、しかも前記第一のアームの突出部が、隣接する前記第二のアームの突出部の間に形成された凹陥部に挿入されているタンディッシュノズル交換装置としてもよい。
F1・X1=F2・X2且つY1=Y2
とされていることを好適とする。
ここで、上記各距離は、下ノズルの移動方向に対して直交する方向の距離である。
本タンディッシュノズル交換装置では、アームの中央部を支点として梃子の原理により、当該アームの一方の端部に付勢力を作用させ、当該アームの他方の端部で下ノズルを押圧支持するものである。本発明では、F1・X1=F2・X2且つY1=Y2として各アームに作用するモーメントを等しくすることで、各下ノズルに作用する押圧力を等しくしている。
ここで、前記中心線は、各アームの支点を通過し、下ノズルの移動方向と直交する仮想線のことである。
本発明では、アームの力点を当該アームの中心線に関して対称に配置することにより、下ノズルに均等に押圧力が作用するようにしている。
このような構成とすることで、使用中にジルコニア質ノズルに亀裂が発生しても割れを防止することができる。その結果、ジルコニア質ノズルを小さくすることができるので、上ノズル及び下ノズルが小さくなり、タンディッシュノズルの孔間距離を従来に比べて短くすることができる。
ここで、前記下ノズルの上端面の幅は、下ノズルの移動方向に対して直交する方向の幅のことである。
下ノズルの上端面が短いほど、タンディッシュノズルの孔間距離を狭くすることができるが、短くしすぎると耐用性が低下するため、79mm以上120mm以下とすることが好ましい。
なお、本発明では、前記下ノズルは、孔の無いブランクプレートを含むものとする。
上ノズルの外径はアームの支点間の距離に制約を受けるため、タンディッシュノズルの孔間距離を短くするためには、アームの支点間の距離を短くする必要がある。そのため、上ノズルの外径が200mmを超えると、タンディッシュノズルの孔間距離が長くなってしまう。一方、上ノズルの外径が100mm未満の場合、上ノズルの下面をフレームで受けるための十分な面積を確保することができず、使用中に上ノズルがずれる危険性がある。
また、本発明に係るタンディッシュノズル交換装置に用いられるタンディッシュノズルでは、ジルコニア質ノズルの外周部にアルミナ質耐火物が巻装された上ノズル及び下ノズルを使用することにより、使用中にジルコニア質ノズルに亀裂が発生しても割れを防止することができる。その結果、ジルコニア質ノズルを小さくすることができるので、上ノズル及び下ノズルが小さくなり、よりタンディッシュノズルの孔間距離を短くすることができる。
2 第一の下ノズル
2a,22a メタルケース
2b,22b アルミナ質耐火物
2c,22c ジルコニア質ノズル
2d,22d ノズル孔
3 第二の下ノズル
4,5 交換用下ノズル
4a ブランクプレート
6,36,46 第一のアーム
6a,7a 突出部
6b,7b 前端部
7,37,47 第二のアーム
7c,37c,47c 凹陥部
8 第一の油圧シリンダー
9 第二の油圧シリンダー
10,11,12,13,30,31,32,33,40,41,42,43 ピン
10a,12a 球面座
14 ベースプレート
15,16 ガイドプレート
17 圧縮コイルバネ
18 フレーム
18a 第一の開口部
18b 第二の開口部
19 ボルト
20,21 注ぎ口
22 第一の上ノズル
23 第二の上ノズル
51 取鍋
52 タンディッシュ
53 鋳型
54 サポートロール
55 スライディングノズル
57 上ノズル
58,59 下ノズル
60 油圧シリンダー
なお、以下の説明では、アームに関して下ノズルに接する側を「前」、その反対側を「後」と便宜上、呼ぶことにする。また、以下の説明における「上」又は「下」の方向は、タンディッシュの底面にタンディッシュノズル交換装置が設置された状態を前提としている。
図3に示すように、ベースプレート14及びフレーム18の中央部には、二つの開口部が隣接して形成されており、一方の開口部には第一の上ノズル22が、他方の開口部には第二の上ノズル23がそれぞれ挿入される。このため、前記二つの開口部は、タンディッシュの底部に設けられた隣接する注ぎ口20,21と第一の上ノズル22及び第二の上ノズル23の孔とがそれぞれ合致するように形成されている。
なお、上ノズル及び下ノズルの構造及び形状については、後で詳細に説明する。
一方、第二のアーム7は、平面視台形状とされ、後端部の両サイドには、後方に突出する突出部7aがそれぞれ形成されている。そして、第二のアーム7の中央部及び突出部7aは、それぞれピン12,13でフレーム18に連結されている。
これにより、第一のアーム6と第二のアーム7を単に並設する場合に比べて、第一の下ノズル2を交換するラインと第二の下ノズル3を交換するラインとの間隔を狭めることができる。
なお、隣接する第一のアーム6と第二のアーム7とは、クリアランスを有する状態で接しており、第一のアーム6の動きと第二のアーム7の動きが互いに干渉することはない。
F1・X1=F2・X2且つY1=Y2
とされている。ここで、上記各距離は、下ノズル2,3,4,5の移動方向に対して直交する方向の距離である。
F1・X1=F2・X2とすることで、第一のアーム6及び第二のアーム7に作用するモーメントは等しくなり、さらにY1=Y2とすることで、第一の下ノズル2及び第二の下ノズル3に作用する押圧力は等しくなる。
なお、第一のアーム6の前端部6b及び第二のアーム7の前端部7bにそれぞれ作用する実際の押圧力は、設定値の±10%以内とすることが望ましい。また、第一のアーム6の前端部6bと第二のアーム7の前端部7bの幅は、下ノズル2,3をできるだけ均等に押圧するため、下ノズル2,3の上端面の幅以上あれば良い。
本タンディッシュノズル交換装置1では、第一の下ノズル2と第二の下ノズル3を同時に交換することもできるし、一方のみ交換することもできる。この際、上述したように、隣接する第一のアーム6と第二のアーム7とは、クリアランスを有する状態で接しているので、一方のアームの動きが他方のアームによって拘束されることはない。
図4に本発明に係るタンディッシュノズル交換装置に用いられるタンディッシュノズル部分の縦断面を、図5と図6に上ノズル、下ノズル、及びブランクプレートの形状をそれぞれ示す。以下では、第一の下ノズル2及び第一の上ノズル22について説明するが、第二の下ノズル3及び第二の上ノズル23も同様である。また、以下の説明では、第一の下ノズル、第一の上ノズルを単に下ノズル、上ノズルと呼ぶことにする。
下ノズル2及びブランクプレート4aの上端面の幅W1は、短いほど、タンディッシュノズルの孔間距離を狭くすることができるが、狭くしすぎると耐用性が低下するため、79~120mmが好ましく、さらには79~110mmがより好ましい。
図8においては、それぞれのアーム6,7の支点間距離は143mm(正確には142.5mm)であり、この時の孔間距離は190mmである。従って、孔間距離を250mm以下とするには、アーム6,7の支点間距離を、あと60mm、即ち、上ノズル22の外径の最大値である200mmまで大きくすることが可能であるが、支点であるピン10,12との干渉を考慮すると180mm以下が、より好ましい。なお、本発明の実施例における上ノズル22の外径は120mmとしている。
なお、上ノズル22が多角形の筒状の場合には、多角形の対角線の距離を外径とする。
一方、第二のアーム37は、平面視E字状とされ、ウェブ部37b及び両フランジ部37aは、それぞれピン32,33でフレーム18に連結されている。ウェブ部37b及び両フランジ部37aによって形成された、後方に開口する凹陥部37cには、隣接する第一のアーム36の突出部36aに加えて中央部の略1/2以上が、クリアランスを有する状態で嵌入している。
一方、第二のアーム47は、平面視C字状とされ、ウェブ部47b及び両フランジ部47aは、それぞれピン42,43でフレーム18に連結されている。ウェブ部47b及び両フランジ部47aによって形成された、後方に開口する凹陥部47cには、隣接する第一のアーム46の一方のフランジ部46a及びウェブ部46bが遊嵌されている。
Claims (7)
- タンディッシュ底部に並設されたタンディッシュノズルを交換する装置であって、
前記タンディッシュ底部に設置された第一の上ノズルの下面に配置される第一の下ノズルを押圧支持する第一のアームと、前記第一の上ノズルに隣接して前記タンディッシュ底部に設置された第二の上ノズルの下面に配置される第二の下ノズルを押圧支持する第二のアームとを備え、
隣接する前記第一のアームと前記第二のアームは、少なくともその一部が重なり合うように配置されていることを特徴とするタンディッシュノズル交換装置。 - 前記第一のアーム及び前記第二のアームは、各々その中央部に支点が設けられ、前記第一のアームの一方の端部の両サイドに形成された突出部に設置された付勢手段により、前記第一のアームの他方の端部が前記第一の下ノズルを押圧支持すると共に、前記第二のアームの一方の端部の両サイドに形成された突出部に設置された付勢手段により、前記第二のアームの他方の端部が前記第二の下ノズルを押圧支持する機構とされ、
しかも前記第一のアームの突出部が、隣接する前記第二のアームの突出部の間に形成された凹陥部に挿入されている請求項1に記載のタンディッシュノズル交換装置。 - 前記第一のアームの一方の端部に作用する付勢力をF1、当該付勢力が作用する力点から前記第一のアームの支点までの距離をX1、当該支点から前記第一の下ノズルを押圧支持する他方の端部までの距離をY1とし、前記第二のアームの一方の端部に作用する付勢力をF2、当該付勢力が作用する力点から前記第二のアームの支点までの距離をX2、当該支点から前記第二の下ノズルを押圧支持する他方の端部までの距離をY2とすると、
F1・X1=F2・X2且つY1=Y2
とされている請求項2に記載のタンディッシュノズル交換装置。 - 前記第一のアームの力点は、当該第一のアームの中心線に関して対称に配置されると共に、前記第二のアームの力点は、当該第二のアームの中心線に関して対称に配置される請求項3に記載のタンディッシュノズル交換装置。
- 請求項1乃至4のいずれかに記載のタンディッシュノズル交換装置に用いられるタンディッシュノズルであって、
上ノズル及び下ノズルは、ジルコニア質ノズルの外周部にアルミナ質耐火物が巻装されていることを特徴とするタンディッシュノズル。 - 前記下ノズルは、上端面の幅が79mm以上120mm以下とされている請求項5に記載のタンディッシュノズル。
- 前記上ノズルは、外径が100mm以上200mm以下とされている請求項5又は6に記載のタンディッシュノズル。
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JP2009548099A JP5433423B2 (ja) | 2007-12-28 | 2008-12-26 | タンディッシュノズル交換装置及びそれに用いるタンディッシュノズル |
US12/810,050 US8414826B2 (en) | 2007-12-28 | 2008-12-26 | Tundish nozzle exchanging device, and tundish nozzle for use in the device |
US13/690,860 US8778258B2 (en) | 2007-12-28 | 2012-11-30 | Tundish nozzle exchanging device, and tundish nozzle for use in the device |
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US13/690,860 Division US8778258B2 (en) | 2007-12-28 | 2012-11-30 | Tundish nozzle exchanging device, and tundish nozzle for use in the device |
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Cited By (3)
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EP2407262A1 (en) * | 2010-03-30 | 2012-01-18 | Akechi Ceramics Co., Ltd. | Cast nozzle |
JP2014518162A (ja) * | 2011-06-26 | 2014-07-28 | インダクトサーム・コーポレイション | デュアル鋳込みノズルを有する溶融金属の保持及び鋳込みボックス |
WO2023224074A1 (ja) * | 2022-05-18 | 2023-11-23 | 黒崎播磨株式会社 | 浸漬ノズル交換装置 |
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US8414826B2 (en) * | 2007-12-28 | 2013-04-09 | Krosaki Harima Corporation | Tundish nozzle exchanging device, and tundish nozzle for use in the device |
GB2545664B (en) * | 2015-12-21 | 2018-12-05 | Monocon International Refractories Ltd | Improved tube changer |
WO2018145772A1 (en) | 2017-02-13 | 2018-08-16 | Monocon International Refractories Limited | Improved flow channel device changer |
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US8414826B2 (en) | 2013-04-09 |
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