JP6487710B2 - Immersion nozzle holder - Google Patents

Description

  The present invention relates to an immersion nozzle holding device for pressing and holding an immersion nozzle against a refractory used in a sliding device.

  In continuous casting, immersion nozzles are used to inject molten steel into the mold. This immersion nozzle is joined to a refractory material such as a refractory plate or a lower nozzle used in a sliding nozzle device provided at the bottom of the tundish. When air enters from this joint surface, the quality of the steel deteriorates or the joint surface of the refractory melts and there is a risk of steel leakage. In order to prevent ingress of air, the immersion nozzle is pressed against the refractory of the sliding device at high pressure.

  As an immersion nozzle holding device for pressing and holding the immersion nozzle against the refractory used in the sliding device as described above, Patent Document 1 discloses that the immersion nozzle is raised and lowered by a hydraulic or pneumatic cylinder and the immersion nozzle is pressed. An immersion nozzle holding device that pressurizes a spring for applying force is disclosed. However, since the immersion nozzle holding device is located on the mold during its use, there is a risk of fire when a hot water leak occurs when a hydraulic cylinder is used.

  Patent Document 2 discloses an immersion nozzle holding device in which an air cylinder is attached on the drive device side of a sliding nozzle device so as to expand and contract in a direction perpendicular to the sliding direction of the sliding nozzle device. In this case, a large air cylinder is required to press the immersion nozzle at a high pressure in order to improve the sealing performance of the joint surface, but depending on the distance between the tundish and the mold upper surface, the air cylinder may contact the floor surface. Therefore, a large air cylinder may not be used. Even if it does not contact the floor surface, the air cylinder may not be driven when the immersion nozzle is replaced during use. Furthermore, in order to secure the distance from the upper surface of the mold, the tundish must be re-installed upward, and a great cost is required. In addition, since the distance between the mold upper surface and the tundish is increased, the cooling portion where the immersion nozzle comes into contact with the outside air becomes longer, thereby causing problems such as heat loss, nozzle clogging, and refractory cost increase.

  Patent Document 3 discloses an example in which an immersion nozzle holding device is provided on the side opposite to the driving device of the sliding nozzle device.

  In recent years, in order to make the discharge flow from the immersion nozzle as uniform as possible, the sliding nozzle device is slid in a position that slides in a direction perpendicular to the longitudinal direction (long side) of the mold, that is, in the thickness direction of the mold. Most cases are arranged to move. When the sliding nozzle device is arranged in this way, when the immersion nozzle holding device is located on the opposite side of the sliding nozzle device driving device as in Patent Document 3, the respective driving devices are arranged on the long side of the mold. Therefore, there is a problem that the work space cannot be secured. For this reason, there is a problem that it becomes difficult to monitor the inside of the mold with a TV camera or that the movement of the powder supply machine is restricted. Furthermore, there is a problem that if the immersion nozzle breaks during casting, it cannot be replaced immediately. There is also a problem that it is impossible to cope with sudden accidents such as leakage of steel from refractories.

JP 7-40014 A JP-A-6-126396 Japanese Patent Laid-Open No. 5-50196

  The problem to be solved by the present invention is the holding of an immersion nozzle that is attached to a sliding nozzle device arranged so as to slide in the thickness direction of the mold, and that raises and lowers the immersion nozzle by a driving device and applies the pressing force of the immersion nozzle. It is an object of the present invention to provide an immersion nozzle holding device that can secure a sufficient space around a mold and has high safety.

According to one aspect of the present invention, “a sliding nozzle device disposed at the bottom of a tundish so as to slide in the thickness direction of the mold is attached and lifted up and down the immersion nozzle by a driving device and applied with a pressing force of the immersion nozzle. In the immersion nozzle holding device, a motor as the driving device is provided on the driving device side of the sliding nozzle device, and in a side view , an angle formed by the longitudinal direction of the rotation shaft of the motor and the sliding direction of the sliding nozzle device Is provided that is within 30 degrees.

Further, according to another aspect of the present invention, “the sliding nozzle device disposed at the bottom of the tundish so as to slide in the thickness direction of the mold is provided, and the dipping nozzle is lifted and lowered by the driving device. in the immersion nozzle holding devices for applying the pressing force, the air cylinder as the drive device is provided independently under the drive of the sliding nozzle device from the drive of the sliding nozzle device, yet in a side view, the air cylinder An immersion nozzle holding device is provided in which the angle formed between the expansion and contraction direction and the sliding direction of the sliding nozzle device is within 30 degrees.

In the present invention, since the motor or the air cylinder is arranged as the driving device for the immersion nozzle on the driving device side of the sliding nozzle device, a sufficient space can be secured on the opposite side of the mold from the driving device for the sliding nozzle device. . Furthermore, the angle between the longitudinal direction of the motor rotation shaft or the expansion / contraction direction of the air cylinder and the sliding direction of the sliding nozzle device in side view is within 30 degrees, so that sufficient space is secured below the sliding nozzle device. can do. Moreover, since no hydraulic cylinder is used, there is no risk of fire due to oil leakage, and safety can be improved.

It is a side view of a tundish using the immersion nozzle holding device which is the 1st example of the present invention. It is a longitudinal cross-sectional view of the immersion nose holding | maintenance apparatus which is the 1st Example of this invention. It is a top view of the immersion nozzle holding device of FIG. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. FIG. 3 is an enlarged view of a cam plate portion in the immersion nozzle holding device of FIG. 2, (a) is a state where a pressing force is applied, and (b) is a state where the pressing force is released. FIG. 6 is a longitudinal sectional view of a main part when the cam plate portion is in the state of FIG. 6B in the immersion nozzle holding device of FIG. 2. It is explanatory drawing of attachment / detachment of the air motor which is a drive device of the immersion nozzle holding | maintenance apparatus of FIG. It is a longitudinal cross-sectional view of the immersion nose holding | maintenance apparatus which is the 2nd Example of this invention. It is a top view of the immersion nozzle holding device of FIG. It is a longitudinal cross-sectional view of the principal part of the immersion nozzle holding device of FIG. It is a longitudinal cross-sectional view of the immersion nose holding | maintenance apparatus which is the 3rd Example of this invention.

  Embodiments of the present invention will be described below based on the embodiments shown in the drawings.

(First embodiment)
FIG. 1 is a side view of a tundish using an immersion nozzle holding device according to a first embodiment of the present invention.

  A sliding nozzle device 32 is provided on the bottom of the tundish 31 so as to slide in the thickness direction of the mold 34. An immersion nozzle holding device 3 having an air motor 12 as a driving device is provided on the driving device 33 side of the sliding nozzle device. It is attached.

  The tundish 31 and the mold 34 are substantially rectangular in plan view and long in the direction perpendicular to the paper surface. Specifically, the tundish 31 has a short side length of about 1.2 m and a long side length of about 5 m, and the mold 34 has a thickness of about 200 mm and a width of about 800 mm.

  The air motor 12 is elongated in the direction of its rotation axis, and is arranged below the driving device (hydraulic cylinder) 33 of the sliding nozzle device in parallel with the sliding direction of the sliding nozzle device 32. For this reason, a sufficient space is secured on the opposite side of the driving device 33 of the sliding nozzle device, and a sufficient space is also secured below the sliding nozzle device 32. Furthermore, since a large air motor with a large torque can be used, the immersion nozzle can be pressed with a large pressure.

  Hereinafter, with reference mainly to FIGS. 2-6, the detail of the immersion nozzle holding | maintenance apparatus 3 which is the 1st Example of this invention is demonstrated.

  The immersion nozzle holding device 3 includes (1) a base plate 6, (2) a guide stand 7 provided on the lower surface of both sides of the base plate 6, and (3) a pin 13 inserted into the long hole 16 of the guide stand 7. A spring case 14 movably held in the vertical direction; (4) a support arm 8 rotatably provided on a pin 13 of the spring case 14; and (5) slidably supported by a guide stand 7 and parallel to each other. A cam plate 11 having a cam groove 19 composed of a stepped groove 19a, 19b and an inclined groove 19c connecting the two stepped grooves, and (6) loosely fitted in the cam groove 19 of the cam plate 11 and between the support arm 8 As a basic configuration, a lifting shaft 17 penetrating the part and (7) a slider 10 fixed integrally with the cam plates 11 on both sides are provided.

  Although this basic configuration itself is the same as that of Patent Document 1, in this embodiment, the base plate 6 is attached to the lower surface of the protrusion 41 on the driving device 33 side of the sliding nozzle device, and is connected to the air motor 12. The bolt 35 is guided to the bearing 36 of the base plate 6 and screwed into the female screw portion 37 provided on the slider 10.

  That is, as shown in FIG. 2, the base plate 6 is attached to the lower surface of the protruding portion 41 protruding downward from the opening / closing metal frame of the sliding nozzle device so that the air motor 12 does not contact (interfere) with the driving device 33 of the sliding nozzle device. It has been. The air motor 12 is detachably held by a motor holding portion 42 provided on the lower surface of the driving device 34 of the sliding nozzle device (see FIG. 8). The rotating shaft of the air motor 12 is connected to the bolt 35 by a connecting cap 39 so that the bolt 35 can be rotated and can be attached to and detached from the bolt 35. The bolt 35 is guided by a bearing 36 extending from the base plate 6, and a male screw portion 38 is screwed into a female screw portion 37 of the slider 10. The air motor 12 has a substantially cylindrical shape, and has a length of about 300 mm and a maximum diameter portion of 80 mm.

  As shown in FIGS. 3 and 5, the slider 10 is guided and supported by the lower surface of the base plate 6 so that both sides are sandwiched by the guide stand 7. The lower surface of the slider 10 is integrally formed with the slider 10. Fixed cam plates 11 are provided facing each other. A protrusion 10 a is provided on the center upper surface of the slider 10, and the protrusion 10 a is slidably guided in the groove 6 a of the base plate 6. Therefore, the slider 10 and the cam plate 11 can smoothly slide back and forth toward the immersion nozzle by the rotation of the air motor 12.

  As shown in FIG. 4, the spring case 14 is supported by the guide stand 7 through a pin 13 so as to be movable in a vertical direction, and a spring 15 is inserted in the spring case 14. Reference numeral 16 denotes a long hole for allowing the pin 13 to move in the vertical direction, and the support arm 8 is lifted by a lifting shaft 17 described later, so that the pin 13 is also lifted within the range of the long hole 16. The spring case 14 rises and pressurizes the spring 15. Therefore, the immersion nozzle 5 is always pressed with a constant pressure.

  As shown in FIG. 5, an elevating shaft 17 is inserted through an intermediate portion of the support arm 8, and both end portions of the elevating shaft 17 are fitted into cam grooves 19 described later via rollers 18.

  As shown in FIG. 6, the cam plate 11 is provided with a cam groove 19 including parallel grooves 19a and 19b which are not parallel to each other and an inclined groove 19c which communicates the parallel grooves 19a and 19b with each other. In addition, both ends of the lifting shaft 17 are fitted in the cam groove 19 via rollers 18 respectively.

  Here, the holding mechanism of the immersion nozzle 5 will be described. As shown in FIG. 7, a large-diameter portion 5a is provided on the outer periphery of the upper portion of the immersion nozzle 5, and the immersion nozzle 5 has a lower surface of the large-diameter portion 5a on the nozzle holder 4. It is held by the nozzle holder 4 so as to be locked.

  Next, the attachment / detachment operation of the immersion nozzle 5 using the immersion nozzle holding device 3 will be described. 2 to 5 show a state in which the immersion nozzle 5 is attached (pressed) to the lower plate 1 that is a refractory used in the sliding apparatus, and first, the case where the immersion nozzle 5 is removed will be described.

  When the air motor 12 is rotated forward from the state shown in FIGS. 2 and 6A to rotate the bolt 35, the slider 10 and the slider 10 are integrated with the female screw portion 37 screwed into the male screw portion 38 of the bolt 35. The cam plate 11 slides away from the immersion nozzle 5. At this time, since the elevating shaft 17 fitted to both ends of the cam groove 19 penetrates the support arm 8, the movement of the cam plate 11 in the sliding direction is restricted by the support arm 8. Accordingly, when the cam plate 11 slides, the elevating shaft 17 moves obliquely downward to the left from the state shown in FIG. 6A along the cam groove 19 (FIG. 6B). The support arm 8 pivotally supported by the rotation rotates synchronously about the pin 13 as a fulcrum. For this reason, the immersion nozzle 5 is separated into the state shown in FIG.

  On the other hand, when mounting the immersion nozzle 5, first, the air motor 12 is rotated forward to slide the slider 10 to a position away from the immersion nozzle 5. That is, the removal operation is completed (FIG. 7). In this state, the immersion nozzle 5 is placed on the support portion 8 a of the arm 8. Next, when the air motor 12 is rotated in the direction opposite to that in the case of the removal, and the slider 10 is slid in the direction approaching the immersion nozzle, the elevating shaft 17 rises as the cam groove 19 moves, so The arm 8 rotates upward with the pin 13 as a fulcrum.

  In this state, the lifting shaft 17 is held by the parallel groove 19a (FIG. 6A), and the support arm 8 is pivotally supported by the lifting shaft 17 in the middle thereof. Further, the base end side (anti-immersion nozzle side) of the support arm 8 is supported by the guide stand 7 via the pin 13 so as to be movable in a predetermined amount in the vertical direction, and is always pressed downward by the spring 15. Yes. Therefore, an upward pressing force acts on the tip of the support arm 8 (immersion nozzle mounting side), and the spring 15 is compressed when a load (immersion nozzle pressing force) higher than the setting is applied for some reason. When the load applied to the support arm 8 becomes equal to or less than the set value, the spring 15 presses the load, so that the pressing force between the lower plate 1 and the immersion nozzle 5 becomes a predetermined pressing force by the spring force of the spring 15. Maintained.

  Here, since the repulsive force of the spring 15 becomes the pressing force of the immersion nozzle 5, in order to prevent the ingress of air from the joint portion of the immersion nozzle 5, by using the spring 15 having a large repulsive force, The pressing force can be increased. In order to further enhance the air entry prevention effect, the pressing force is preferably 2.9 N (about 300 kgf), more preferably 3.9 N (about 400 kgf) or more.

  As shown in FIG. 8, the air motor 12 is detachable by sliding along the slide guide 43 of the motor holding portion 42. Specifically, the slide guide 43 is a groove that opens on the opposite side, and the air motor 12 has a guide plate 12 a that is guided by the slide guide 43 and slides. Thus, since the air motor 12 can be attached to and detached from the motor holding portion 42, it can be removed when the immersion nozzle 5 is used, so that it is not exposed to high temperatures. Further, since the air motor 12 can obtain a larger output even if it is smaller than the air cylinder, the apparatus can be made compact. An electric motor can be used in the same manner as the air motor 12.

As described above, in the immersion nozzle holding device 2 of the present invention, the air motor 12 that is a driving device is installed in the sliding nozzle device in order to secure a sufficient space on one side of the mold 34 (on the opposite side of the driving device 33 of the sliding nozzle device). Is provided on the drive device 33 side. Further, in order to ensure a sufficient space below the sliding nozzle device 32, the immersion nozzle holding device 2 of the present invention is configured so that the longitudinal direction of the rotation shaft of the air motor 12 and the sliding direction of the sliding nozzle device 32 are seen in a side view . The sliding nozzle device 32 is attached so that the angle formed is within 30 degrees. This angle is preferably 0 degrees, that is, the longitudinal direction of the rotating shaft of the air motor 12 and the sliding direction of the sliding nozzle device 32 are most preferably parallel. However, within 30 degrees, a practically sufficient space can be secured. . When this angle exceeds 30 degrees, the space below the sliding nozzle device 32 becomes narrow. For this reason, it may contact the upper surface of the mold depending on the use environment. Since an air motor or an electric motor usually has a longer length in the longitudinal direction of the rotating shaft than a length perpendicular to the longitudinal direction of the rotating shaft, the motor is arranged below the driving device 33 of the sliding nozzle device. However, a wider space can be secured under the motor. More specifically, it is more preferable to use a motor having a ratio L1 / L2 between the length L1 in the longitudinal direction and the length L2 in the direction perpendicular to the longitudinal direction of 2 or more.

  Further, by arranging the motor in this way, a large motor having a larger output can be used, and the immersion nozzle can be pressed at a high pressure.

  In this embodiment, the air motor 12 can always be mounted. That is, since the air motor has high heat resistance, the immersion nozzle can be exchanged in the mold in a mounted state when the immersion nozzle is used. Furthermore, depending on use conditions, the heat load of the motor can be reduced by arranging a heat insulating plate around the mold and the motor. As the heat insulating plate, an iron plate or a steel plate coated with a heat insulating material can be used.

(Second embodiment)
Next, a second embodiment in which an air cylinder is used in place of an air motor as a driving device for the immersion nozzle holding device of the present invention will be described with reference to FIGS.

  As shown in FIGS. 9 and 10, one end of the air cylinder 44 is rotatably attached to the air cylinder receiving portion 45 extending downward from the base plate 6, and the rod 46 of the air cylinder is attached to the moving bar 47 at the other end. Attached to the center. In this state, the expansion / contraction direction of the rod 46 of the air cylinder is inclined 10 degrees with respect to the sliding direction of the sliding nozzle device. The moving bar 47 is U-shaped in plan view, and both ends are rotatably connected to the connecting portions of the two sets of link bars 48 and 49. Two link bars 48 and 49 form a pair and are arranged so as to face each other. The other end of the link bar 49 on the nozzle support arm 8 side is rotatably connected to the end of the support arm 8 opposite to the immersion nozzle 5. The link bar 48 on the spring 52 side is rotatably connected to a spring presser 51 in the spring case 50. The spring case 50 is attached to the base plate 6, and a spring 52 is contained therein. The central portion of the support arm 8 is rotatably held by a support arm receiving portion 53 that extends downward from the base plate 6.

  Next, the operation of the immersion nozzle holding device of the second embodiment will be described.

  In FIG. 9, since the rod 46 of the air cylinder 44 contracts, the moving bar 47 moves to the opposite side to the immersion nozzle 5, so the connecting portion of the two sets of link bars 48 and 49 is opposite to the immersion nozzle 5. Move to. As a result, the two pairs of link bars 48 and 49 become linear, so that the support arm 8 has the central portion as a fulcrum, the connecting portion with the link bar 49 descends, and conversely the support portion 8a rises and the immersion nozzle 5 To raise. At the same time, the link bar 48 on the spring 52 side deflects the spring 52. When the rod 46 of the air cylinder 44 is completely contracted, the state shown in FIG. 11 is obtained, and the connecting portions of the two sets of link bars 48 and 49 are located on the opposite side of the immersion nozzle 5 from the respective base ends. In this state, the air cylinder 44 is stopped, and the immersion nozzle 5 is always pressed by the force of the spring 52.

  Thus, by arranging the air cylinder 44 so that the inclination of the expansion / contraction direction with respect to the sliding direction of the sliding nozzle device is within 30 degrees, it is possible to secure a space below the sliding nozzle device. . Since a sufficient space can be secured, a large or long stroke air cylinder can be used, and the immersion nozzle can be pressed at a higher pressure.

(Third embodiment)
FIG. 12 is a longitudinal sectional view of an immersion nose holding device according to a third embodiment of the present invention. In the second embodiment described above, the structure in which the supply of air to the air cylinder 44 can be stopped during use by using the spring 52 is used. However, in the third embodiment, the spring 52 is used without using the spring. Inside, air is supplied to the air cylinder, and a cotter is inserted as a safety measure when the air supply stops. Since the other structure of the third embodiment is substantially the same as that of the second embodiment, the configuration corresponding to the second embodiment is denoted by the same reference numerals as those of the second embodiment in FIG. Therefore, the description is omitted.

  In the third embodiment, a cotter insertion arm 54 is provided so as to extend downward from the fixed metal frame 2 that holds the lower plate 1, and a cotter insertion portion 54 a into which a cotter 55 can be inserted below the cotter insertion arm 54. Is provided. On the other hand, the support arm 8 is provided with an extension portion 8b so as to extend to the cotter insertion portion 54a. Then, as in the second embodiment (FIG. 11), the cotter 55 is inserted into the cotter insertion portion 54a in a state where the immersion nozzle 5 is pressed upward by the support arm 8 using the air cylinder 44 (FIG. 12). . If it does so, the extension part 8b of the support arm 8 will engage with the cotter 55, and it becomes impossible to rotate below any more. Thereby, even if the supply of air to the air cylinder 44 is stopped due to a power failure or the like, the pressing force of the immersion nozzle 5 can be maintained.

DESCRIPTION OF SYMBOLS 1 Lower plate 2 Fixed metal frame 3 Immersion nozzle holding device 4 Nozzle holder 5 Immersion nozzle 6 Base plate 7 Guide stand 8 Nozzle support arm 8a Support part 8b Extension part 10 Slider 11 Cam plate 12 Air motor 13 Pin 14 Spring case 15 Spring 16 Long hole DESCRIPTION OF SYMBOLS 17 Lifting shaft 18 Roller 19 Cam groove 31 Tundish 32 Sliding nozzle device 33 Driving device of sliding nozzle device 34 Mold 35 Bolt 36 Bearing 37 Female screw part 38 Male screw part 39 Connection cap 41 Protrusion part 42 Motor holding part 43 Slide guide 44 Air cylinder 45 Air cylinder receiver 46 Air cylinder rod 47 Moving bar 48 Link bar 49 Link bar 50 Spring case 51 Spring retainer 52 Spring 53 Support arm receiving part 54 Cotter insertion arm 54a Cotter insertion part 55 Cotter

Claims (6)

In the immersion nozzle holding device which is attached to the sliding nozzle device arranged at the bottom of the tundish so as to slide in the thickness direction of the mold, and raises and lowers the immersion nozzle by the driving device and applies the pressing force of the immersion nozzle,
A motor is provided as the drive device on the drive device side of the sliding nozzle device, and the angle formed by the longitudinal direction of the rotating shaft of the motor and the sliding direction of the sliding nozzle device is 30 degrees or less in a side view . Nozzle holding device. In the immersion nozzle holding device which is attached to the sliding nozzle device arranged at the bottom of the tundish so as to slide in the thickness direction of the mold, and raises and lowers the immersion nozzle by the driving device and applies the pressing force of the immersion nozzle,
An air cylinder as the driving device is provided below the driving device of the sliding nozzle device independently from the driving device of the sliding nozzle device , and in a side view, the expansion direction of the air cylinder and the sliding direction of the sliding nozzle device An immersion nozzle holding device having an angle of 30 degrees or less. A nozzle support arm for holding the immersion nozzle, a lifting shaft for lifting and lowering the nozzle support arm, a cam plate for lifting and lowering the lifting shaft, and a slider for sliding the cam plate,
The motor as the driving device is attached to the protruding portion on the driving device side of the sliding nozzle device, the bolt is connected to the rotating shaft of the motor, the tip of the bolt is screwed to the slider, and the slider slides by the rotation of the motor. The immersion nozzle holding device according to claim 1.   A bolt and a detachable coupling cap are attached to a tip of a rotating shaft of the motor, the motor is detachably attached to a motor holding portion having a slide guide, and the motor has a guide plate guided by the slide guide. 4. The immersion nozzle holding device according to 3. The immersion nozzle holding device according to any one of claims 1 to 4 , wherein the immersion nozzle is pressed at 2.9 kN or more.   The immersion nozzle holding device according to claim 2, further comprising a spring or a cotter for holding the pressing force of the immersion nozzle when the air supply to the air cylinder is stopped.