Sliding Nozzle Device

Abstract

To provide a sliding nozzle device configured so that a slide metal frame can be prevented from falling, when the slide metal frame is opened at an uppermost position which is a position where the slide metal frame moves to an uppermost side.SOLUTION: A sliding nozzle device S comprises a stationary metal frame 1 and a slide metal frame 2 provided to be openable and closable and slidable with respect to the stationary metal frame 1, which is erected so that a sliding direction of the slide metal frame 2 becomes a vertical direction when the slide metal frame 2 is opened. A falling preventing member 9 is provided in the stationary metal frame 1, and a locking member 7 is provided in the slide metal frame 2. The falling preventing member 9 has a locking surface 91 that locks the locking member 7, when opening the slide metal frame 2 at an uppermost position which is a position where the slide metal frame 2 moves to an uppermost side in a state where the sliding nozzle device is erected so that the sliding direction of the slide metal frame 2 becomes the vertical direction.SELECTED DRAWING: Figure 1

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] The sliding nozzle device adjusts the amount of molten steel flowing from a molten metal vessel by sliding one of two or three refractory plates with nozzle holes, which are sandwiched under high pressure (under surface pressure). The sliding refractory plate is housed in a sliding metal frame that can be opened and closed relative to a fixed metal frame to allow replacement of the refractory plate during maintenance. The sliding metal frame is also slidable relative to the fixed metal frame to allow the refractory plate to slide. A drive device, such as a hydraulic cylinder, is connected to the sliding metal frame to slide the sliding metal frame (see, for example, Patent Document 1).

[0003] When maintaining such a sliding nozzle device, the device is installed in a maintenance yard in an upright position with the sliding direction of the sliding metal frame vertical. At this time, a drive device for sliding the sliding metal frame is provided above or below the sliding device, and the sliding metal frame is movable up and down. When opening and closing the sliding metal frame, it is generally opened and closed at the lowest position, which is the position where the sliding metal frame has moved to the lowest position.

[0004] On the other hand, there are cases where it is desired to open and close the sliding metal frame at the uppermost position, where the sliding metal frame is moved to the uppermost position. However, when opening and closing the sliding metal frame at the uppermost position, the sliding metal frame may fall to the lowermost position when opening the sliding metal frame, which may damage the sliding nozzle device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-64439 Summary of the Invention [Problem to be solved by the invention]

[0006] The problem that the present invention aims to solve is to provide a sliding nozzle device that can prevent the sliding metal frame from falling when the sliding metal frame is opened at the uppermost position, which is the position where the sliding metal frame has moved to the uppermost position. [Means for solving the problem]

[0007] 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 that is slidably provided and can be opened and closed relative to the fixed metal frame, and that can be set up so that the sliding direction of the sliding metal frame is vertical when the sliding metal frame is opened, The fixed metal frame is provided with a fall prevention member, and the sliding metal frame is provided with a locking member, The anti-fall member has a locking surface that locks the locking member when the sliding metal frame is opened at the uppermost position, which is the position to which the sliding metal frame has moved most upward when the sliding direction of the sliding metal frame is set vertically. [Effects of the Invention]

[0008] According to the sliding nozzle device of the present invention, the sliding metal frame can be prevented from falling when the sliding metal frame is opened at the uppermost position where the sliding metal frame has moved to the uppermost position. [Brief explanation of the drawings]

[0009] [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 nozzle hole is fully closed, and FIG. 1B shows a state in which the sliding metal frame is opened and closed relative to the fixed metal frame. [Figure 2] 2A and 2B are longitudinal cross-sectional views of the sliding nozzle device shown in FIG. 1, where (a) is a cross-sectional view taken along line AA in FIG. 1A and (b) is a cross-sectional view taken along line BB in FIG. 1B. [Figure 3] FIG. 10 is a perspective view of the sliding nozzle device in a state where the sliding metal frame is fully opened relative to the fixed metal frame. [Figure 4] FIG. [Figure 5] FIG. 2 is a perspective view of the state of FIG. 1(b) viewed obliquely from below. [Figure 6] 6 is a perspective view showing a state in which the drive shaft of the drive device is at its rearmost position from the state in FIG. 5; [Figure 7] 7 is a perspective view showing a state in which the connection state between the main body of the locking member and the connecting portion of the sliding metal frame and the connecting portion of the drive device is changed from the state in FIG. 6; [Figure 8] FIG. [Figure 9] FIG. 2 is a perspective view showing a state in which the sliding metal frame 2 is slightly opened from the state shown in FIG. 1(b), with spring boxes on both sides and the like omitted. [Figure 10] 10 is a perspective view showing the state in which the sliding metal frame has been further opened from the state shown in FIG. 9 to be fully opened, with the spring boxes on both sides and the like omitted. [Figure 11] FIG. 10 is a perspective view showing a state in which the drive shaft of the drive unit is erroneously moved backward during maintenance. [Figure 12] 10 is a perspective view showing a state in which the fall prevention member restricts the movement of the connecting pin when the sliding metal frame is opened. FIG. [Figure 13] 4 is a perspective view showing a state in which a coupling portion of the drive device has moved to a position lower than the uppermost position in FIG. 3; [Figure 14] 14 is a perspective view showing the action of the blocking member when attempting to close the sliding metal frame from the state of FIG. 13. DETAILED DESCRIPTION OF THE INVENTION

[0010] FIG. 1 shows a perspective view of a sliding nozzle according to one embodiment of the present invention, with FIG. 1(a) showing a state in which the nozzle hole is fully closed, and FIG. 1(b) showing a state in which the sliding frame is opened or closed relative to the fixed frame. FIG. 2 shows a longitudinal cross section of the sliding nozzle device shown in FIG. 1, with FIG. 1(a) showing the AA cross section of FIG. 1(a) and FIG. 1(b) showing the BB cross section of FIG. 1(b). FIG. 3 shows a perspective view of the sliding nozzle device in a state in which the sliding frame is fully opened relative to the fixed frame. As mentioned above, the sliding frame is opened or closed with the sliding nozzle device standing vertically, and so FIGS. 1 to 3 show the sliding nozzle device standing vertically. The same applies to FIG. 4 and subsequent figures described below.

[0011] 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.

[0012] 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.

[0013] In the sliding nozzle device S, a refractory plate 4A mounted in the plate storage section 11 of the fixed metal frame 1 and a refractory plate 4B mounted in the plate storage section 21 of the sliding metal frame 2 are placed opposite each other, and surface pressure is applied between the refractory plates 4A and 4B. The sliding metal frame 4 is slid to adjust the amount of molten steel flowing out of the molten metal vessel. Specifically, the refractory plates 4A and 4B are provided with nozzle holes 4A-1 and 4B-1, respectively. By sliding the sliding metal frame 2, the aperture of the nozzle holes formed by the overlap of the nozzle holes 4A-1 and 4B-1 is changed, thereby adjusting the amount of molten steel flowing out of the molten metal vessel. A lower nozzle 5 is joined to the refractory plate 4B.

[0014] Here, Figures 1(a) and 2(a) show the nozzle hole in a fully closed state. After use in a foundry or the like, the sliding nozzle device is in this fully closed state. When the sliding nozzle device is to be maintained, it is carried into the maintenance yard in this fully closed state, and then is set up so that the sliding direction of the sliding frame 2 is vertical, as shown in Figures 1(a) and 2(a). In the following explanation, the position of the sliding frame 2 in this fully closed state will be referred to as the "fully closed position."

[0015] When the sliding metal frame 2 is opened to perform maintenance on the sliding nozzle device in a maintenance yard, the sliding metal frame 2 is moved to an open / closed position, which is a position above the fully closed position, as shown in Figures 1(b) and 2(b). This open / closed position is the uppermost position to which the sliding metal frame 2 has been moved. In this embodiment, when the sliding metal frame 2 is in the fully closed position, a surface pressure is applied between the fireproof plates 4A and 4B. When the sliding metal frame 2 is moved to the uppermost position, the surface pressure is released. That is, in this embodiment, the application or release of the surface pressure is performed by using the movement of the sliding metal frame 2 along the sliding direction and the two spring boxes 3. Note that the mechanism for applying or releasing the surface pressure by using the movement of the sliding metal frame 2 along the sliding direction and the two spring boxes 3 is well known, so a description thereof will be omitted.

[0016] As shown in FIG. 3, 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. Although not shown in the figure, the hinge 22 is provided with a through-hole that rotatably and slidably supports the hinge shaft 12, and the hinge shaft 12 passes through this through-hole. 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 that passes through the through-hole of the hinge 22. Also, in this embodiment, the sliding metal frame 2 can slide relative to the fixed metal frame 1 by sliding along the hinge shaft 12 that passes through the through-hole of the hinge 22. The lower end of the hinge shaft 12 shown in FIG. 1(a) is inserted into a bearing hole 721, which will be described later.

[0017] The sliding nozzle device S is equipped with a drive device 6 that slides the sliding metal frame. In this embodiment, the drive device 6 is located below the sliding metal frame 2 when the sliding metal frame 2 is set upright so that the sliding direction of the sliding metal frame 2 is vertical, and is installed on the fixed metal frame 1 side by a support frame 13. In this embodiment, a hydraulic cylinder is used as the drive device 6. The sliding metal frame 2 has a connection portion 23 that is connected to the connection portion 61 of the drive unit 6. As will be described in detail later, the sliding metal frame 2 is also provided with a locking member 7. A pin (hereinafter referred to as a "connecting pin") 8 that connects the connection portion 23 and the locking member 7 is removably inserted into the connection portion 23 and the locking member 7. In this embodiment, the connecting pin 8 is removably inserted into a through hole 231 provided in the connection portion 23 and a through hole 711 provided in the main body portion 71 of the locking member 7.

[0018] The coupling portion 61 of the drive device 6 is fixed to the tip of the drive shaft 62 of the drive device 6 . FIG. 4 shows a perspective view of the connecting portion 61 alone. Referring to FIG. 4 along with FIGS. 1 to 3 described above, the connecting portion 61 has a base end frame 611 and two opposing parallel frames 612 extending from the base end frame 611 in the sliding direction of the sliding metal frame 2. Between the two opposing parallel frames 612, there is a space 613 into which the connecting portion 23 of the sliding metal frame 2 is inserted. Each of the two parallel frames 612 has a groove-shaped recess 614 at its distal end, which opens on the side opposite the fixed metal frame 1, and a through-hole 615 at its proximal end (the drive unit 6 side). The groove-shaped recesses 614 and the through-holes 615 of the two parallel frames 612 share a common central axis perpendicular to the sliding direction. As will be described in detail later, the connecting portion 61 is provided with a blocking member 10 that prevents the sliding metal frame 2 from closing when the connecting portion 61 is in a position lower than the uppermost position, which is the position where the connecting portion 61 is moved to the uppermost position. On the other hand, the connection part 23 of the sliding metal frame 2 extends from the center along the longitudinal central axis, which is the sliding direction of the sliding metal frame 2, and has a through-hole 231 at its tip end. The tip of this connection part 23 can abut against the base end frame 611 of the coupling part 61 of the drive unit 6, and when they abut, the respective through-holes 615, 231 are aligned.

[0019] 1(a) and 2(a), when the sliding frame 2 is in the fully closed position, i.e., when surface pressure is applied between the fireproof plates 4A and 4B, the connecting pin 8 is inserted into the through-hole 711 of the main body 71 of the locking member 7, the through-hole 231 of the connecting part 23 of the sliding frame 2, and the through-hole 615 of the connecting part 61 of the driving device 6, thereby connecting the main body 71 of the locking member 7 and the connecting part 23 of the sliding frame 2 to the connecting part 61 of the driving device 6. When the sliding frame 2 is in the fully closed position, the drive shaft 62 of the driving device 6 is in the forward limit, as shown in FIG.

[0020] Next, to release the surface pressure between the fireproof plates 4A and 4B, the sliding frame 2 is moved to the uppermost position as shown in FIGS. 1(b) and 2(b). Specifically, in the state shown in FIGS. 1(a) and 2(a) where the surface pressure is applied, the connecting pin 8 inserted into the through-hole 711, the through-hole 231, and the through-hole 615 is pulled out. Then, the drive shaft 62 of the drive unit 6 is moved backward to align the groove-like recess 614 of the connecting portion 61 of the drive unit 6 with the through-hole 711 of the main body 71 of the locking member 7 and the through-hole 231 of the connecting portion 23 of the sliding frame 2. Next, the connecting pin 8 is inserted into the groove-like recess 614 of the connecting portion 61 of the drive unit 6 and the through-hole 711 of the main body 71 of the locking member 7 and the through-hole 231 of the connecting portion 23 of the sliding frame 2 to connect them, and then the drive shaft 62 of the drive unit 6 is moved to the forward limit. As a result, the sliding metal frame 2 moves to the uppermost position and the surface pressure is released as shown in Figure 1(b) and Figure 2(b). Figure 5 shows a perspective view of the state of Figure 1(b) as seen obliquely from below.

[0021] On the other hand, to apply a surface pressure, the drive shaft 62 of the drive unit 6 is moved to the rearmost position from the state shown in FIG. 5. This causes the sliding frame 2 to move to the surface pressure application position as shown in FIG. 6, and surface pressure is applied along the way. After that, the connecting pin 8 inserted into the groove-shaped recess 614 of the connecting portion 61 of the drive unit 6, the through hole 711 of the main body 71 of the locking member 7, and the through hole 231 of the connection portion 23 of the sliding frame 2 is pulled out. Then, the drive shaft 62 of the drive unit 6 is advanced to align the through hole 614 of the connecting portion 61 of the drive unit 6 with the through hole 711 of the main body 71 of the locking member 7 and the through hole 231 of the connection portion 23 of the sliding frame 2. Then, as shown in FIG. 7, the connecting pin 8 is inserted into the through hole 615 of the connecting portion 61 of the drive unit 6, the through hole 711 of the main body 71 of the locking member 7, and the through hole 231 of the connection portion 23 of the sliding frame 2 to connect them. Thereafter, when the drive shaft 62 of the drive unit 6 is moved to the forward limit, the position of the sliding frame 2 in the sliding direction becomes the fully closed position shown in Figures 1(a) and 2(a). As described above, when the sliding frame 2 is in the fully closed position, surface pressure is applied between the fireproof plates 4A and 4B, and the frame is transported to the foundry in this fully closed state.

[0022] As described above, in this embodiment, when used in a foundry, the connecting pin 8 is inserted into the through hole 615 of the connecting portion 61 of the drive unit 6, the through hole 711 of the main body 71 of the locking member 7, and the through hole 231 of the connecting portion 23 of the sliding frame 2, thereby connecting the main body 71 of the locking member 7 and the connecting portion 23 of the sliding frame 2 to the connecting portion 61 of the drive unit 6. On the other hand, when applying or releasing surface pressure in a maintenance facility, the connecting pin 8 is inserted into the groove-like recess 614 of the connecting portion 61 of the drive unit 6, the through hole 711 of the main body 71 of the locking member 7, and the through hole 231 of the connecting portion 23 of the sliding frame 2, thereby connecting the main body 71 of the locking member 7 and the connecting portion 23 of the sliding frame 2 to the connecting portion 61 of the drive unit 6.

[0023] 1 and 5 to 7, in this embodiment, the fixed metal frame 1 is provided with a fall prevention member 9. Furthermore, the sliding metal frame 2 is provided with the locking member 7 as described above. Figure 8 is a perspective view showing the fall prevention member 9 and the locking member 7 alone. In order to clearly show the shapes of the two members, the positional relationship between the fall prevention member 9 and the locking member 7 in Figure 8 is such that the sliding metal frame 2, which is in the fully closed position in Figure 1(a), has been moved further downward. 9 shows the state in which the sliding metal frame 2 is slightly opened from the state shown in FIG. 1(b), with the spring boxes 3 on both sides omitted. Furthermore, FIG. 10 shows the state in which the sliding metal frame is further opened from the state shown in FIG. 9 to the fully opened state, with the spring boxes 3 on both sides omitted.

[0024] The configurations of the fall prevention member 9 and the locking member 7 will be described with reference to Figures 1 and 5 to 10. The fall prevention member 9 has a locking surface 91 that locks the locking member 7 when the sliding metal frame 2 is opened at the uppermost position, which is the position to which the sliding metal frame 2 has moved most upward when the sliding metal frame 2 is erected so that the sliding direction of the sliding metal frame 2 is vertical. In this embodiment, the fall prevention member 9 further has an abutment surface 92 that abuts against the locking member 7 when the sliding metal frame 2 is opened at a position lower than the above-mentioned uppermost position. In this embodiment, the locking member 7 has a main body 71 and a protrusion 72 protruding from the main body 71. The main body 71 extends along the longitudinal direction of the sliding metal frame 2 from a position on the hinge 22 side of the longitudinal center axis, which is the sliding direction of the sliding metal frame 2. In other words, the main body 71 is provided so as to face the connection part 23 of the sliding metal frame 2 described above, and between the main body 71 and the connection part 23, the parallel frame 612 located on the hinge shaft 12 side of the two opposing parallel frames 612 described above can be inserted.

[0025] The protrusion 72 protrudes from the main body 71 toward the hinge 22. When the sliding frame 2 is opened at the uppermost position, the lower surface of the protrusion 72 is engaged with the engagement surface 91 of the fall prevention member 9. The protrusion 72 has a generally quadrantal planar shape and has a bearing hole 721 located approximately at the center of the quadrant. When the sliding frame 2 is opened at the uppermost position, the lower end of the hinge shaft 12 is inserted into this bearing hole 721, thereby aligning the center of the bearing hole 721 with the central axis of the hinge shaft 12. In other words, when the sliding frame 2 is opened, the protrusion 72 rotates around the lower end of the hinge shaft 12. By inserting the hinge shaft 12 into the bearing hole 721 when the sliding frame 2 is opened, wobbling of the engagement member 7 is prevented when the sliding frame 2 is opened, allowing the sliding frame 2 to be opened smoothly.

[0026] 8, the protrusion 72 has an opposing surface 722 that faces the abutment surface 92 of the fall prevention member 9 with a small gap W therebetween. The opposing surface 722 also has a concave surface 723 on the radially outer side when the protrusion 72 rotates around the lower end of the hinge shaft 12 as the rotation center. The abutment surface 92 of the fall prevention member 9 also has a convex surface 921 that matches with the concave surface 723. Furthermore, an inclined surface 922 that slopes downward is formed at the upper end of the convex surface 921. Here, the gap W shown in Fig. 8 is formed when a surface pressure load is applied as shown in Fig. 1(a). That is, in the sliding nozzle device S of this embodiment, when a surface pressure load is applied, there is a gap W between the opposing surface 722 of the protrusion 72 and the abutting surface 92 of the fall prevention member 9, so that the locking member 7 and the fall prevention member 9 are not rubbed against each other and damaged when the sliding metal frame 2 slides.

[0027] Next, the procedure for opening and closing the sliding metal frame 2 will be described. As described above, when the sliding nozzle device is maintained, it is brought into the maintenance site with the sliding metal frame 2 in the fully closed position, and then it is set upright so that the sliding direction of the sliding metal frame 2 is vertical, as shown in Figures 1(a) and 2(a). In this fully closed state, a surface pressure is applied between the fireproof plates 4A and 4B. Next, the sliding frame 2 is moved to the uppermost position to release the surface pressure, as shown in Figures 1(b), 2(b), and 5. The procedure for moving the sliding frame 2 from the fully closed position to the uppermost position is as described above.

[0028] When the sliding metal frame 2 moves to the uppermost position, the lower end of the hinge shaft 12 is inserted into the bearing hole 721 provided in the protrusion 72 of the locking member 7. In addition, the height level of the lower surface of the protrusion 72 of the locking member 7 coincides with the height level of the locking surface 91 of the fall prevention member 9. When the sliding metal frame 2 is rotated in the opening direction from this state around the hinge shaft 12 as the center of rotation, the sliding metal frame 2 rotates in the opening direction while the lower surface of the protrusion 72 of the locking member 7 is locked with the locking surface 91 of the fall prevention member 9, as shown in Figures 9 and 10. At this time, there is a concave portion 723 on the radially outer side of the opposing surface 722 which faces the abutment surface 92 of the fall prevention member 9 across a small gap W, and the abutment surface 92 of the fall prevention member 9 has a convex portion 921 which matches with the concave portion 723, and furthermore the upper end of the convex portion 921 has an inclined surface 922 which slopes downward.Therefore, when the sliding metal frame 2 is rotated in the opening direction, the radially outer surface of the lower surface of the protrusion 72 is immediately guided by the inclined surface 922 and smoothly engages with the engaging surface 91 of the fall prevention member 9. At this time, the connecting portion 61 of the drive unit 6 is also in the uppermost position, and the blocking member 10 provided on the connecting portion 61 passes between the main body portion 71 of the locking member 7 and the connection portion 23 when the sliding metal frame 2 is rotated in the opening direction, and does not hinder the opening and closing of the sliding metal frame 2.

[0029] On the other hand, when the sliding metal frame 2 is opened at a position lower than the uppermost position, for example, at a position where the drive shaft 62 of the drive unit 6 is accidentally moved backward during maintenance as shown in Figure 11, the opposing surface 722 of the protrusion 72 of the locking member 7 comes into contact with the contact surface 92 of the fall prevention member 9. Therefore, when the sliding metal frame 2 is at a position lower than the uppermost position, for example, at the position shown in Figure 11 described above, the sliding metal frame 2 cannot be opened.

[0030] As described above, in this embodiment, the sliding frame 2 can be opened only when the sliding frame 2 is in the uppermost position, and cannot be opened when the sliding frame 2 is in a position lower than the uppermost position. When the sliding frame 2 is opened when the sliding frame 2 is in the uppermost position, the lower surface of the protrusion 72 of the locking member 7 is locked with the locking surface 91 of the fall prevention member 9, as described above, so that the sliding frame 2 can be prevented from falling.

[0031] 10 , when the sliding metal frame 2 is fully opened, one end of the connecting pin 8 inserted into the through hole 711 of the main body 71 of the locking member 7 and the through hole 231 of the connection portion 23 of the sliding metal frame 2, i.e., the end on the hinge 22 side, faces the abutment surface 92 of the fall prevention member 9. Therefore, even if the connecting pin 8 moves toward the hinge 22, the end of the connecting pin 8 on the hinge 22 side abuts against the abutment surface 92 of the fall prevention member 9, as shown in FIG. 12 , thereby restricting the movement of the connecting pin 8 toward the hinge 22 side and preventing the connecting pin 8 from falling out of the through hole 711 of the main body 71 of the locking member 7 and the through hole 231 of the connection portion 23 of the sliding metal frame 2. In this embodiment, a handle 81 is provided at the end on the hinge 22 side of the connecting pin 8, and this handle 81 restricts the movement of the connecting pin 8 toward the opposite side from the hinge 22 side. In other words, even if the connecting pin 8 moves in the direction opposite to the hinge 22 side, the handle 81 of the connecting pin 8 abuts against the side of the main body 71 of the locking member 7 on the hinge 22 side, thereby restricting the movement of the connecting pin 8 in the direction opposite to the hinge 22 side, and preventing the connecting pin 8 from falling out of the through hole 711 of the main body 71 of the locking member 7 and the through hole 231 of the connection part 23 of the sliding metal frame 2.

[0032] Next, when closing the sliding frame 2, the sliding frame 2 rotates in the closing direction in the order of Figures 10, 9, and 5, which is the opposite of the above-mentioned opening. That is, in the states of Figures 10 and 9, the sliding frame 2 rotates in the closing direction while the lower surfaces of the protrusions 72 of the locking members 7 are locked with the locking surfaces 91 of the fall prevention members 9. Thereafter, even if the sliding frame 2 rotates in the closing direction until the lower surfaces of the protrusions 72 of the locking members 7 are no longer locked with the locking surfaces 91 of the fall prevention members 9, the connecting pin 8 is inserted into the groove-like recess 614 of the connecting portion 61 of the drive unit 6, and the sliding frame 2 finally reaches the state shown in Figure 5. In this way, in this embodiment, the sliding frame 2 can be prevented from falling even when closed.

[0033] Here, in the states shown in Figures 10, 9 and 5, the connecting portion 61 of the drive unit 6 is also in the uppermost position, and the blocking member 10 provided on the connecting portion 61 passes between the main body portion 71 of the locking member 7 and the connection portion 23 when the sliding metal frame 2 is rotated in the closing direction, and does not hinder the closing of the sliding metal frame 2. On the other hand, as shown in Fig. 13, if the connecting part 61 of the driving device 6 is in a position lower than the uppermost position due to an erroneous operation of the driving device 6 or the like, the connecting pin 8 inserted into the through-hole 711 of the main body 71 of the locking member 7 and the through-hole 231 of the connection part 23 of the sliding metal frame 2 will hit the blocking member 10 as shown in Fig. 14. As a result, the sliding metal frame 2 cannot be closed. In this embodiment, when the connecting pin 8 hits the blocking member 10 as shown in Figure 14, the protrusion 72 of the locking member 7 is locked with the locking surface 91 of the fall prevention member 9. Therefore, when the connecting part 61 of the drive unit 6 is moved to a position lower than the uppermost position, the sliding metal frame 2 will not fall even if an attempt is made to close it. In this manner, in this embodiment, the blocking member 10 prevents the sliding metal frame 2 from being closed when the connecting portion 61 of the drive unit 6 is in a position lower than the uppermost position. If the sliding metal frame 2 could be closed when the connecting portion 61 of the drive unit 6 is in a position lower than the uppermost position, there is a risk that the sliding metal frame 2 will fall when it rotates in the closing direction until the lower surface of the protrusion 72 of the locking member 7 is no longer locked by the locking surface 91 of the fall prevention member 9.

[0034] As described above, according to this embodiment, the sliding metal frame 2 can be prevented from falling when opening the sliding metal frame 2 at the top position, which is the position where the sliding metal frame 2 has been moved to the uppermost position, and the sliding metal frame 2 can also be prevented from falling when closing the sliding metal frame that has been opened at the top position.

[0035] In this embodiment, the driving device 6 is located below the sliding metal frame 2 when the sliding direction of the sliding metal frame 2 is set vertically, but it may be located above the sliding metal frame 2. In this case, too, the driving device 6 opens and closes the sliding metal frame 2 at the uppermost position, which is the position where the sliding metal frame 2 has moved to the uppermost position.

[0036] On the other hand, in conventional sliding nozzle devices, when the drive unit 6 is located above the sliding frame 2, the sliding frame 2 is generally opened and closed at the lowest position, where it has been moved to its lowest position. This is to prevent the sliding frame from falling during opening and closing. Therefore, when the drive unit 6 is located below the sliding frame 2 as in this embodiment, the sliding frame 2 can be opened and closed at the highest position, where it has been moved to its highest position, and when the drive unit 6 is located above the sliding frame 2, the sliding frame 2 can be opened and closed at the lowest position, where it has been moved to its lowest position. This allows the design of the support frame 13 supporting the drive unit 6 to be standardized whether the drive unit 6 is located above or below the sliding frame 2. From this perspective, in the present invention, it is preferable that the drive unit 6 be located below the sliding frame 2 when the sliding frame 2 is opened and is erected so that the sliding direction of the sliding frame 2 is vertical, as in this embodiment. [Explanation of symbols]

[0037] S Sliding nozzle device 1 Fixed Gold Frame 11 Plate storage section 12 Hinge axis 13 Support frame 2 Slide gold frame 21 Plate storage section 22 Hinge 23 Connection 231 Through hole 3 Spring box 4A, 4B Fireproof Plate 4A-1, 4B-1 Nozzle holes 5 Lower nozzle 6. Drive unit 61 Connecting part 611 Base frame 612 Parallel Frame 613 Space 614 Groove-shaped recess 615 Through hole 62 Drive shaft 7 Locking member 71 Main body 711 Through hole 72 Protrusion 721 Bearing hole 722 Opposite surface 723 Concave part 8 connecting pin 81 Toride 9 Fall prevention members 91 Locking surface 92 Contact surface 921 Convex part 922 Slope 10 Blocking member

Claims

1. A sliding nozzle device comprising a fixed metal frame and a sliding metal frame that is slidably provided and can be opened and closed relative to the fixed metal frame, and that can be set up so that the sliding direction of the sliding metal frame is vertical when the sliding metal frame is opened, The fixed metal frame is provided with a fall prevention member, and the sliding metal frame is provided with a locking member, The fall prevention member is a sliding nozzle device having a locking surface that locks the locking member when the sliding metal frame is opened at the uppermost position, which is the position to which the sliding metal frame has moved most upward when the sliding direction of the sliding metal frame is set vertically.

2. 2. The sliding nozzle device according to claim 1, wherein the fall prevention member has an abutment surface that abuts against the locking member when the sliding metal frame is opened at a position below the uppermost position.

3. The locking member has a main body and a protrusion protruding from the main body, 3. The sliding nozzle device according to claim 1, wherein when the sliding metal frame is opened at the uppermost position, the protrusion is engaged with the engaging surface of the fall prevention member.

4. The fixed metal frame is provided with a hinge shaft that rotatably supports the sliding metal frame, The protrusion has a bearing hole, 4. The sliding nozzle device according to claim 3, wherein the hinge shaft is inserted into the bearing hole when the sliding metal frame is opened.

5. The sliding metal frame has a connection part that is connected to a connection part of a drive device that slides the sliding metal frame, a pin that connects the connecting portion and the locking member is inserted into the connecting portion and the locking member; 5. The sliding nozzle device according to claim 1, wherein the fall prevention member restricts movement of the pin when the sliding metal frame is opened.

6. 6. The sliding nozzle device according to claim 5, wherein the connecting portion of the drive device is provided with a blocking member that prevents the sliding metal frame from being closed when the connecting portion is in a position lower than the uppermost position, which is the position at which the connecting portion has been moved to the uppermost side.

7. a drive device for sliding the sliding metal frame; 7. The sliding nozzle device according to claim 1, wherein when the sliding metal frame is opened and is erected so that the sliding direction of the sliding metal frame is vertical, the drive unit is located below the sliding metal frame.

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