Sliding Nozzle Device

Abstract

To provide a sliding nozzle device configured so that components constituting the sliding nozzle device are prevented from being damaged even if face pressure is applied thereto in state where a fireproof plate is not attached thereto.SOLUTION: The sliding nozzle device comprises a stationary metal frame 1 and a slide metal frame 2 provided to be slidable with respect to the stationary metal frame 1. The slide metal frame 2 can be moved to a first position where face pressure can be applied to a space between the fireproof plates in a state where the fireproof plates are attached to a plate storage part 11 of the stationary metal frame 1 and a plate storage part of the slide metal frame 2 respectively and to a second position where face pressure can be applied to a space between the stationary metal frame 1 and the slide metal frame 2 in a state where the fireproof plates are not attached to the plate storage part 11 of the stationary metal frame 1 and the plate storage part of the slide metal frame 2 respectively.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a sliding nozzle device that is attached to the bottom of a molten metal vessel such as a ladle and adjusts the amount of molten steel flowing out of the molten metal vessel. [Background technology]

[0002] A known sliding nozzle device, as disclosed in Patent Document 1, for example, is one in which a refractory plate attached to a fixed metal frame and a refractory plate attached to a sliding metal frame are placed opposite each other, a surface pressure is applied between the refractory plates, and the sliding metal frame is slid to adjust the amount of molten steel flowing out of a molten metal container.

[0003] In such a sliding nozzle device, it is assumed that surface pressure will be applied via the sliding frame when a fire-resistant plate is attached to each of the fixed metal frame and the sliding metal frame. Therefore, if surface pressure is applied to the sliding frame when a fire-resistant plate is not attached due to an operator's incorrect operation, there is a possibility that the components that make up the sliding nozzle device, such as the sliding metal frame itself, the hinge shaft that allows the sliding metal frame to rotate relative to the fixed metal frame, and the connecting shaft that connects the sliding metal frame to a drive device that slides the sliding metal frame, will be damaged. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-208380 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to provide a sliding nozzle device in which the components constituting the sliding nozzle device are less likely to be damaged even when a surface pressure is applied without a fire-resistant plate attached. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided the following sliding nozzle device. A sliding nozzle device comprising a fixed metal frame and a sliding metal frame slidably provided relative to the fixed metal frame, The fixed metal frame and the sliding metal frame each have a plate storage portion for mounting a fire-resistant plate, a surface pressure can be applied between the fireproof plates in a state where the fireproof plate attached to the plate storage portion of the fixed metal frame and the fireproof plate attached to the plate storage portion of the sliding metal frame are opposed to each other, The sliding metal frame is movable between a first position where a surface pressure can be applied between the fireproof plates with fireproof plates attached to the plate storage portion of the fixed metal frame and the plate storage portion of the sliding metal frame, and a second position where a surface pressure can be applied between the fixed metal frame and the sliding metal frame with fireproof plates not attached to the plate storage portion of the fixed metal frame and the plate storage portion of the sliding metal frame, respectively. [Effects of the Invention]

[0007] According to the present invention, even when a surface pressure is applied without a fire-resistant plate attached, the components constituting the sliding nozzle device are unlikely to be damaged. [Brief explanation of the drawings]

[0008] [Figure 1] 1A and 1B are perspective views of a sliding nozzle device according to one embodiment of the present invention, in which FIG. 1A shows a state in which the sliding metal frame is slightly opened relative to the fixed metal frame, and FIG. 1B shows a state in which the sliding metal frame is fully opened relative to the fixed metal frame. [Figure 2] FIG. 2 is a front view of the sliding nozzle device in a horizontal position, which is the state in which it is used. [Figure 3] FIG. 2 is a plan view of the sliding nozzle device in a horizontal position, which is the state in which it is used. [Figure 4]FIG. 2 is a bottom view of the sliding nozzle device in a horizontal position, which is the state in which it is used. [Figure 5] Cross-sectional view along the AA direction in Figure 3. [Figure 6] FIG. 4 is an enlarged cross-sectional view in the direction BB in FIG. 3 . [Figure 7] Cross-sectional view of Figure 3 taken along the CC direction. [Figure 8] A cross-sectional view corresponding to Figure 5, showing a state in which no fire-resistant plates are attached to the fixed metal frame and the sliding metal frame, and surface pressure is applied between the fixed metal frame and the sliding metal frame. [Figure 9] A cross-sectional view corresponding to Figure 6, showing a state in which no fire-resistant plates are attached to the fixed metal frame and the sliding metal frame, and surface pressure is applied between the fixed metal frame and the sliding metal frame. [Figure 10] A cross-sectional view corresponding to Figure 7, showing a state in which no fire-resistant plates are attached to the fixed metal frame and the sliding metal frame, and surface pressure is applied between the fixed metal frame and the sliding metal frame. DETAILED DESCRIPTION OF THE INVENTION

[0009] Figure 1 shows a perspective view of a sliding nozzle according to one embodiment of the present invention, with (a) the sliding metal frame slightly open relative to the fixed metal frame, and (b) the sliding metal frame fully open relative to the fixed metal frame. Note that the sliding metal frame is opened when the sliding nozzle device is in a vertical position, so Figure 1 shows the sliding nozzle device in a vertical position. 2, 3, and 4 show a front view, a plan view, and a bottom view, respectively, of the sliding nozzle device in a horizontal position, which is the state in which it is used. Also, Fig. 5 shows a cross-sectional view taken along the line AA in Fig. 3. In this specification, the term "in use" refers to a state in which the sliding nozzle device is attached to the bottom of a molten metal container such as a ladle and the amount of molten steel that flows out during casting is adjusted.

[0010] The sliding nozzle device S of this embodiment has a fixed metal frame 1, a sliding metal frame 2 that is slidable and openable / closable relative to the fixed metal frame 1, and two spring boxes 3 that are rotatably mounted on both sides of the fixed metal frame 1.

[0011] The fixed metal frame 1 is a substantially rectangular plate-like member, and is provided with a plate storage section 11 for storing the refractory plate 4A inside. The fixed metal frame 1 is fixed to the bottom of a molten metal container such as a ladle with bolts (not shown). The slide metal frame 2 is also a substantially rectangular plate-like member, and is formed therein with a plate storage portion 21 for storing the fire-resistant plate 4B.

[0012] As shown in Figure 5, in the sliding nozzle device S in use, a refractory plate 4A mounted in the plate storage section 11 of the fixed metal frame 1 faces a refractory plate 4B mounted in the plate storage section 21 of the sliding metal frame 2. A surface pressure is applied between the refractory plate 4A and the refractory plate 4B, and the sliding metal frame 4 is slid to adjust the amount of molten steel flowing from the molten metal vessel. Specifically, the refractory plate 4A and the refractory plate 4B are provided with nozzle holes 4A-1 and 4B-1, respectively. By sliding the sliding metal frame 2, the nozzle hole apertures formed by the overlapping of the nozzle holes 4A-1 and 4B-1 are changed, thereby adjusting the amount of molten steel flowing from the molten metal vessel. Note that Figure 5 shows the nozzle hole aperture fully closed. A lower nozzle 5 is attached to the refractory plate 4B.

[0013] In this embodiment, the surface pressure is applied using two spring boxes 3. That is, the sliding nozzle device S of this embodiment has two spring boxes 3, so that it is possible to apply or release surface pressure between the fireproof plate 4A attached to the plate storage portion 11 of the fixed metal frame 1 and the fireproof plate 4B attached to the plate storage portion 21 of the sliding metal frame 2 in a state where the fireproof plate 4A and the fireproof plate 4B are opposed to each other. Note that the mechanism for applying or releasing surface pressure using the two spring boxes 3 is well known, so a description thereof will be omitted.

[0014] As shown in FIG. 1(b), the fixed metal frame 1 is provided with a hinge shaft 12 that rotatably and slidably supports the hinge 22 of the sliding metal frame 2. Furthermore, as shown in FIG. 6, which is an enlarged cross-sectional view in the direction BB of FIG. 3, the hinge 22 is provided with an elongated hole 221, and the hinge shaft 12 is inserted into this elongated hole 121. That is, in this embodiment, the sliding metal frame 2 can be opened and closed relative to the fixed metal frame 1 by rotating around the hinge shaft 12 inserted into the elongated hole 221 of the hinge 22 as the center of rotation. Furthermore, in this embodiment, the sliding metal frame 2 can slide relative to the fixed metal frame 1 by sliding along the hinge shaft 12 inserted into the elongated hole 221 of the hinge 22. In this embodiment, the elongated hole 121 is formed long in the direction perpendicular to the sliding surface of the sliding metal frame 2.

[0015] As shown in Figure 1(b), a convex strip 23 is provided on both ends of the sliding metal frame 2, extending in the sliding direction of the sliding metal frame 2, and the upper surface of this convex strip 23 forms a convex surface 231. The inside of this convex strip 23 (towards the center of the sliding metal frame 2) forms a concave surface 24.

[0016] The sliding nozzle device S is provided with a drive device 6 that slides the sliding metal frame. In this embodiment, a hydraulic cylinder is used as the drive device 6. As shown in FIGS. 1, 4, 5, and 7, which is a cross-sectional view taken along the CC direction in FIG. 3, the drive unit 6 has a connecting portion 61 that connects to the connecting shaft 25 of the sliding metal frame 2. The connecting shaft 25 is removably attached to an attachment hole 26 provided at the base end of the sliding metal frame 2. The connecting portion 61 is fixed to the tip of a drive shaft 62 of the drive unit 6, and is provided with an elongated hole 611 through which the connecting shaft 25 passes to connect to the connecting shaft 25. That is, in this embodiment, the connecting shaft 25 passes through the attachment hole 26 and the elongated hole 611, thereby connecting the slide frame 2 and the connecting portion 61 of the drive unit 6. The slide frame 2 slides when the drive shaft 62 of the drive unit 6 advances or retreats. In this embodiment, the elongated hole 611 is elongated in a direction perpendicular to the sliding surface of the slide frame 2.

[0017] 2 to 7 show a state in which the fireproof plates 4A and 4B are mounted in the plate storage section 11 of the fixed metal frame 1 and the plate storage section 21 of the sliding metal frame 2, respectively, and a surface pressure is applied between the fireproof plates 4A and 4B. That is, the sliding metal frame 2 is in a first position where a surface pressure can be applied between the fireproof plates 4A and 4B when the fireproof plates 4A and 4B are mounted in the plate storage section 11 of the fixed metal frame 1 and the plate storage section 21 of the sliding metal frame 2, respectively. Specifically, in this embodiment, the hinge shaft 21 of the fixed metal frame 1 is located on one longitudinal side (upper side in FIG. 6) of the elongated hole 221 formed in the hinge 22 of the sliding metal frame 2, as shown in FIG. 6. Specifically, in FIG. 6, a gap S1 is present between the upper edge of the hinge shaft 12 and the upper edge of the elongated hole 221, and a gap S2 is present between the lower edge of the hinge shaft 12 and the lower edge of the elongated hole 221. In the first position, the vertical length of the gap S1 is shorter than the vertical length of the gap S2. 7, the connecting shaft 25 of the sliding metal frame 2 is located on the other longitudinal side (the lower side in FIG. 7) of the elongated hole 611 provided in the connecting portion 61 of the drive unit 6. Specifically, in FIG. 7, there is a gap S3 between the upper edge of the connecting shaft 25 and the upper edge of the elongated hole 611, and there is a gap S4 between the lower edge of the connecting shaft 25 and the lower edge of the elongated hole 611. In the first position, the vertical length of the gap S3 is longer than the vertical length of the gap S4. Furthermore, as shown in FIG. 6, when the sliding metal frame 2 is in the first position, the convex surface 231 of the sliding metal frame 2 is not in contact with the fixed metal frame 1.

[0018] On the other hand, in this embodiment, the sliding frame 2 can be moved to a second position where a surface pressure can be applied between the fixed frame 1 and the sliding frame 2 when the fireproof plates 4A and 4B are not attached to the plate storage section 11 of the fixed frame 1 and the plate storage section 21 of the sliding frame 2, respectively. This will be explained in detail below.

[0019] Figures 8 to 10 are cross-sectional views corresponding to Figures 5 to 7, in which the fireproof plate 4A and the fireproof plate 4B are not attached to the plate storage section 11 of the fixed metal frame 1 and the plate storage section 21 of the sliding metal frame 2, respectively, and surface pressure is applied between the fixed metal frame 1 and the sliding metal frame 2.

[0020] 8 to 10, the hinge shaft 22 of the sliding metal frame 2 has moved to the other longitudinal side (downward in FIG. 9) of the elongated hole 121 provided in the hinge 12 of the fixed metal frame 1, as shown in FIG. 9. Specifically, in FIG. 9, there is a gap S1 between the upper edge of the hinge shaft 12 and the upper edge of the elongated hole 221, and there is a gap S2 between the lower edge of the hinge shaft 12 and the lower edge of the elongated hole 221. In the second position, the vertical length of the gap S1 is longer than the vertical length of the gap S2. 10, the connecting shaft 25 of the sliding metal frame 2 has moved to one longitudinal side (upward in FIG. 10) within the elongated hole 611 provided in the connecting portion 61 of the drive unit 6. Specifically, in FIG. 10, there is a gap S3 between the upper edge of the connecting shaft 25 and the upper edge of the elongated hole 611, and there is a gap S4 between the lower edge of the connecting shaft 25 and the lower edge of the elongated hole 611. In the second position, the vertical length of the gap S3 is shorter than the vertical length of the gap S4. Furthermore, as shown in FIG. 9, when the sliding metal frame 2 is in the second position, the convex surface 231 of the sliding metal frame 2 is in contact with the fixed metal frame 1, and a surface pressure is applied between the fixed metal frame 1 and the sliding metal frame 2. In other words, the second position is a position where surface pressure can be applied between the fixed metal frame and the sliding metal frame, and more specifically, the second position is a position where the sliding metal frame is parallel to the fixed metal frame and the fixed metal frame and the sliding metal frame are in contact.

[0021] As described above, in this embodiment, the sliding frame 2 is movable between a first position shown in Figures 5 to 7 where a surface pressure can be applied between the fireproof plates 4A and 4B with the fireproof plates 4A and 4B attached to the plate storage section 11 of the fixed frame 1 and the plate storage section 21 of the sliding frame 2, respectively, and a second position shown in Figures 8 to 10 where a surface pressure can be applied between the fixed frame 1 and the sliding frame 2 with the fireproof plates 4A and 4B not attached to the plate storage section 11 of the fixed frame 1 and the plate storage section 21 of the sliding frame 2, respectively. Specifically, in this embodiment, the hinge shaft 12 of the fixed frame 1 moves within the elongated hole 221 provided in the hinge 22 of the sliding frame 2 when the sliding frame 2 moves between the first position shown in Figure 6 and the second position shown in Figure 9. Although it is the elongated hole 221 that actually moves, not the hinge shaft 12, the movement of the elongated hole 221 causes the hinge shaft 12 to move within the elongated hole 221. Meanwhile, the connecting shaft 25 of the sliding metal frame 2 moves within the elongated hole 611 provided in the connecting part 61 of the drive unit 6 when the sliding metal frame 2 moves between the first position shown in Fig. 7 and the second position shown in Fig. 10.

[0022] In conventional sliding nozzle devices, the fireproof plates are mounted on the fixed and sliding frames, and surface pressure is applied to or released from the fireproof plates when they are in surface contact with each other. In other words, the fireproof plates are configured to be thicker than the plate housing sections of the fixed and sliding frames, and surface pressure is applied to or released from the fireproof plates when they are not in contact with each other. Even in such cases, elongated holes are provided in the hinges of the sliding frame to accommodate movement of the sliding frame due to pressurization or depressurization between the fireproof plates, and the hinge shaft of the fixed frame is inserted into these holes. However, if the fireproof plates are not mounted, the hinges of the sliding frame move toward the fixed frame by the thickness of the fireproof plates, resulting in contact between the lower edges of the elongated holes in the hinges of the sliding frame and the lower edges of the hinge shafts of the fixed frame. If pressure is applied between the metal frames in this state, the hinge shaft may be pressed against the fixed metal frame by the lower edge of the long hole, causing the hinge shaft to bend. More specifically, in a conventional sliding nozzle device, when surface pressure is applied between the fixed metal frame and the sliding metal frame without the fireproof plate attached, the lower edge of the elongated hole of the hinge of the sliding metal frame comes into contact with the lower edge of the hinge shaft of the fixed metal frame, and the upper edge of the connecting shaft of the sliding metal frame comes into contact with the upper edge of the elongated hole provided in the connecting part of the drive unit. In other words, in a conventional sliding nozzle device, the sliding metal frame is not configured to be movable to a second position where surface pressure can be applied between the fixed metal frame and the sliding metal frame without the fireproof plate attached. In other words, in a conventional sliding nozzle device, when surface pressure is applied without the fireproof plate attached, components that make up the sliding nozzle device, such as the hinge shaft and connecting shaft, will be damaged.

[0023] In response to this, the present invention recognizes the problem that, as described above, surface pressure may be applied to the sliding metal frame when the fireproof plate is not attached due to an operator's operational error or the like, and aims to provide a sliding nozzle device in which components of the sliding nozzle device are less likely to be damaged even when surface pressure is applied when the fireproof plate is not attached. To solve this problem, in this embodiment, the length of the elongated hole 221 provided in the hinge 22 of the sliding metal frame 2 is made longer than that of the elongated hole in a conventional sliding nozzle device so that the hinge shaft 12 of the fixed metal frame 1 can move within the elongated hole 221 between the first position shown in FIG. 6 and the second position shown in FIG. 9. Specifically, the length of the elongated hole 221 is made longer in a direction away from the fixed metal frame 1 (downward in FIG. 9) than that of the elongated hole in a conventional sliding nozzle device so that a gap S2 is formed between the lower edge of the hinge shaft 12 and the lower edge of the elongated hole 221 at the second position shown in FIG. 9. Furthermore, the length of the elongated hole 611 is made longer than that of the elongated hole in a conventional sliding nozzle device so that the connecting shaft 25 of the sliding metal frame 2 can move within the elongated hole 611 provided in the connecting portion 61 of the drive device 6 between the first position shown in Fig. 7 and the second position shown in Fig. 10. Specifically, the length of the elongated hole 611 is made longer in the direction approaching the fixed metal frame 1 (upward in Fig. 10) than that of the elongated hole in a conventional sliding nozzle device so that a gap S3 is formed between the upper edge of the connecting shaft 25 and the upper edge of the elongated hole 611 at the second position shown in Fig. 10. In this embodiment, regardless of whether the sliding metal frame 2 is in the first position or the second position, the hinge axis 12 does not come into contact with the upper or lower edge of the elongated hole 221, and the connecting axis 25 does not come into contact with the upper or lower edge of the elongated hole 611.

[0024] As described above, in this embodiment, the sliding frame 2 is movable between a first position where a surface pressure can be applied between the fireproof plates 4A and 4B with the fireproof plates 4A and 4B attached to the plate storage section 11 of the fixed frame 1 and the plate storage section 21 of the sliding frame 2, respectively, and a second position where a surface pressure can be applied between the fixed frame 1 and the sliding frame 2 with the fireproof plates 4A and 4B not attached to the plate storage section 11 of the fixed frame 1 and the plate storage section 21 of the sliding frame 2, respectively. Therefore, in the sliding nozzle device S of this embodiment, even when a surface pressure is applied with the fireproof plates 4A and 4B not attached, the components that make up the sliding nozzle device S are unlikely to be damaged.

[0025] In this embodiment, the end of the sliding metal frame 2 is provided with a convex surface 231 and a concave surface 24, and the convex surface 231 is configured to come into contact with the fixed metal frame 1 when the sliding metal frame 2 is in the second position. By limiting the surface that comes into contact with the fixed metal frame 1 when the sliding metal frame 2 is in the second position to the convex surface 231 in this way, it is possible to stably apply surface pressure between the fixed metal frame 1 and the sliding metal frame 2. Therefore, the fixed metal frame 1 and the sliding metal frame 2 are less likely to be damaged when surface pressure is applied.

[0026] Furthermore, in this embodiment, even if a surface pressure is applied when the refractory plates 4A, 4B are not attached, the components constituting the sliding nozzle device S are unlikely to be damaged, and therefore the surface pressure can be applied when the refractory plates 4A, 4B are not attached. In this way, the nozzle holes can be fully opened when the refractory plates 4A, 4B are not attached, so the upper nozzle (not shown) located at the top of the fixed frame 1 can be cleaned without opening the sliding frame. Furthermore, when a molten metal container such as a ladle is in an upright position, the nozzle holes can be fully opened without the refractory plates, so brick chips can be discharged from the nozzle holes, i.e., the opening, of the sliding nozzle device S after the lining bricks of the molten metal container are dismantled. [Explanation of symbols]

[0027] S Sliding nozzle device 1 Fixed Gold Frame 11 Plate storage section 12 Hinge axis 2 Slide gold frame 21 Plate storage section 22 Hinge 221 long hole 23 Convex strip 231 Convex 24 Concave 25 Connecting shaft 26 Mounting hole 3 Spring box 4A, 4B Fireproof Plate 4A-1, 4B-1 Nozzle holes 5 Lower nozzle 6. Drive unit 61 Connecting part 611 Long hole 62 Drive shaft

Claims

1. A sliding nozzle device comprising a fixed metal frame and a sliding metal frame slidably provided relative to the fixed metal frame, The fixed metal frame and the sliding metal frame each have a plate storage portion for mounting a fire-resistant plate, a surface pressure can be applied between the fireproof plates in a state where the fireproof plate attached to the plate storage portion of the fixed metal frame and the fireproof plate attached to the plate storage portion of the sliding metal frame are opposed to each other, The sliding metal frame is movable between a first position where a surface pressure can be applied between the fireproof plates when a fireproof plate is attached to the plate storage portion of the fixed metal frame and the plate storage portion of the sliding metal frame, and a second position where a surface pressure can be applied between the fixed metal frame and the sliding metal frame when a fireproof plate is not attached to the plate storage portion of the fixed metal frame and the plate storage portion of the sliding metal frame, respectively.

2. The end of the slide metal frame is provided with a convex surface, 2. The sliding nozzle device according to claim 1, wherein the convex surface contacts the fixed metal frame when the sliding metal frame is in the second position.

3. The fixed metal frame is provided with a hinge shaft that rotatably and slidably supports the hinge of the sliding metal frame, The hinge shaft is inserted into the hinge, 3. The sliding nozzle device according to claim 1, wherein the hinge shaft is movable within the hinge when the sliding metal frame moves between the first position and the second position.

4. Further, a drive device for sliding the sliding metal frame is provided, The drive device has a connecting portion that connects to the connecting shaft of the slide metal frame, 4. The sliding nozzle device according to claim 1, wherein the connecting shaft is movable within the connecting portion when the sliding metal frame moves between the first position and the second position.

Images