Submerged nozzle exchange device and upper nozzle

Abstract

A submerged nozzle replacement device and an upper nozzle capable of suppressing damage to the plate portion of the upper nozzle are provided. [Solution] A submerged entry nozzle exchanging device 1 is attached to a lower part of a molten steel discharge port 101 of a tundish 100. The submerged entry nozzle exchanging device 1 comprises a support part 3 and a flap 4. The support part 3 has a support surface 31 that supports the lower surface of a plate part 201 of an upper nozzle 200 to be inserted into the molten steel discharge port 101. The flap 4 is rotatable relative to the support part 3, and the submerged entry nozzle exchanging device 1 further comprises a rotation stopper 8 for the flap 4. The rotation stopper 8 has a wedge 81 that protrudes above the flap 4 and abuts against the flap 4, and a bolt 83 connected to the wedge 81, and the protruding amount of the wedge 81 can be adjusted by adjusting the amount of tightening of the bolt 83.

Description

[Technical Field]

[0001] The present invention relates to a submerged entry nozzle exchange device that is attached to the lower part of the molten steel discharge port of a tundish, and an upper nozzle that is fixed to the submerged entry nozzle exchange device. [Background technology]

[0002] In continuous casting, molten steel is transferred from the tundish to the mold through an upper nozzle inserted into the molten steel discharge port of the tundish and a submerged nozzle connected to the upper nozzle. As disclosed in Patent Document 1, the upper nozzle may be provided with a tubular portion and a plate portion. In such an upper nozzle, the plate portion is fixed by a flap of the submerged nozzle exchange device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 01 / 81028 Summary of the Invention [Problem to be solved by the invention]

[0004] When fixing the upper nozzle to the submerged entry nozzle exchange device with a flap, the fixing device may be a rotating cam as in Patent Document 1. In this case, the cam needs to be pressed in with a wooden mallet, and the fixing device pressed by the cam may hit the upper nozzle, damaging the upper nozzle.

[0005] The problem to be solved by the present invention is to provide an immersion nozzle replacement device and an upper nozzle that can suppress damage to the upper nozzle. [Means for solving the problem]

[0006] The present invention provides the following submerged nozzle replacement device and upper nozzle. 1. A submerged entry nozzle replacement device attached to a lower part of a molten steel discharge port of a tundish, A support portion and a flap are provided, the support portion has a support surface that supports a lower surface of a plate portion of the upper nozzle that is inserted into the molten steel discharge port, the flap is rotatable relative to the support; a rotation stopper for the flap; the rotation stopper includes a wedge that protrudes above the flap and abuts against the flap, and a bolt that is connected to the wedge; By adjusting the amount of tightening of the bolt, the amount of protrusion of the wedge can be adjusted. the law of nature , the flap has a parallel surface that is parallel to the support surface of the support portion when the flap sandwiches the plate portion of the upper nozzle, and an abutment portion that abuts against the outer periphery of the tubular portion of the upper nozzle, The abutment portion has an arc shape that follows the outer periphery of the tubular portion of the upper nozzle. Submerged nozzle replacement device. 2. The bolt is threaded into the bolt guide, and a locking device for the bolt is attached to the rotation stopper. 1 The submerged nozzle replacement device according to claim 1. 3. The wedge is inserted into a wedge guide; the bolt guide and the wedge guide are fixed to a frame; The frame is fixed to the bottom of the tundish. 2 The submerged nozzle replacement device according to claim 1. 4. The parallel surfaces of the flaps have recesses or protrusions that fit into the protrusions or recesses provided on the upper surface of the plate portion of the upper nozzle. 3 The submerged nozzle replacement device according to any one of claims 1 to 4. 5. The aforementioned 4 An upper nozzle fixed to the submerged nozzle exchange device according to claim 1, a tubular portion and a plate portion; The upper nozzle has a convex or concave portion on the upper surface of the plate portion that fits into a concave or convex portion provided on the parallel surface of the flap. [Effects of the Invention]

[0007] According to the present invention, damage to the upper nozzle fixed to the submerged nozzle replacement device can be suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of an immersion nozzle replacement device according to an embodiment of the present invention. [Figure 2] 2 is a cross-sectional view of the essential parts of the submerged entry nozzle exchange device of FIG. 1 attached to a tundish (cross-sectional view taken along the AA direction of FIG. 1). [Figure 3] FIG. 2 is an exploded perspective view showing the support, the flap, and the spring box. [Figure 4] FIG. 2 is an enlarged perspective view of a main part of the submerged nozzle replacement device. [Figure 5] FIG. 2 is an enlarged perspective view of a main part of the submerged nozzle replacement device. [Figure 6] FIG. 10 is a perspective view showing the relationship between the flap and the rotation stopper. [Figure 7] BB cross-sectional view of FIG. 6. [Figure 8] Cross-sectional view taken along the CC direction in Figure 6. [Figure 9] Cross-sectional view of Figure 1 taken along the DD direction. [Figure 10] FIG. 4 is a perspective view showing the flap, the spring box, and the upper nozzle. [Figure 11] FIG. [Figure 12] FIG. 10 is a perspective view showing another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] An immersion nozzle exchanging device according to one embodiment of the present invention is shown in Figure 1. Figure 2 shows a cross section of the immersion nozzle exchanging device attached to a tundish along the line AA in Figure 1. As shown in Fig. 2, the submerged entry nozzle exchanging device 1 is attached to the lower part of the molten steel discharge port 101 of the tundish 100. Specifically, the frame 2 of the submerged entry nozzle exchanging device 1 is fixed to the steel shell 102 at the bottom of the tundish 100 with bolts or the like. The submerged entry nozzle replacement device 1 includes a support part 3 that supports the upper nozzle 200, and a flap 4 that fixes the upper nozzle 200 supported by the support part 3. The upper nozzle 200 has a plate part 201 and a tubular part 202. The tubular part 202 of the upper nozzle 200 is inserted into the molten steel discharge port 101 of the tundish 100. The plate part 201 of the upper nozzle 200 is connected to the plate part 301 of the submerged entry nozzle 300. As a result, the molten steel in the tundish 100 is transferred to the mold via the upper nozzle 200 and the submerged entry nozzle 300.

[0010] The SEN exchange device 1 exchanges the SEN 300 for a new SEN. To this end, the SEN exchange device 1 is equipped with a pair of guide rails 5, 5 arranged parallel to each other and facing each other. Each of the pair of guide rails 5, 5 has an inlet section 51, 51 through which a new SEN is inserted when the SEN is being exchanged, an outlet section 52, 52 through which the old SEN 300 is discharged when the SEN is being exchanged, and an intermediate section 53, 53 that supports the SEN 300 during operation. Here, "during operation" in this specification refers to the time when molten steel is transferred from the tundish to the mold. In this embodiment, the intermediate portions 53, 53 are formed by a plurality of keyboard-shaped pressing members 54 for pressing the submerged nozzle 300 against the upper nozzle 200. That is, during operation, as shown in Figure 2, the plurality of pressing members 54 support the lower surface of the plate portion 301 of the submerged nozzle 300. The pressing members 54 press the submerged nozzle 300 against the upper nozzle 200 by the elastic force of a coil spring 61 as an elastic body housed in a spring box 6.

[0011] As shown in FIG. 1, the SEN replacement device 1 is equipped with a hydraulic cylinder 7 as a drive device for pushing a new SEN inserted into the inlet sections 51, 51 of a pair of guide rails 5, 5. The hydraulic cylinder 7 is rotatable around a rotation axis 71 provided near the inlet section 51 of one of the pair of guide rails 5, 5. When inserting a new SEN into the inlet sections 51, 51 of the pair of guide rails 5, 5, the hydraulic cylinder 7 is rotated around the rotation axis 71 to retract from its position in FIG. 1 in the direction of arrow E. Once the new SEN is inserted into the inlet sections 51, 51 of the pair of guide rails 5, 5, the hydraulic cylinder 7 is returned to its position in FIG. 1. The hydraulic cylinder 7 then pushes the new SEN. As a result, the new SEN moves from the inlet sections 51, 51 to the intermediate sections 53, 53 while pushing the old SEN 300. Accordingly, the old SEN 300 moves from the intermediate sections 53, 53 to the discharge sections 52, 52. In this way, the old submerged entry nozzle 300 is replaced with a new submerged entry nozzle.

[0012] Next, the support portion 3 and the flap 4 will be described. In this embodiment, the support part 3 is provided so as to be continuous with the spring box 6. In addition, the flap 4 is attached above the support part 3. Figure 3 is an exploded perspective view showing the relationship between the support part 3, the flap 4, and the spring box 6. As shown in FIGS. 2 and 3 , the support portion 3 has a support surface 31 that supports the underside of the plate portion 201 of the upper nozzle 200. The flap 4 is rotatably attached to the support portion 3 via a rotation pin 43. The flap 4 has a parallel surface 41 that is parallel to the support surface 31 of the support portion 3 when the plate portion 201 of the upper nozzle 200 is sandwiched between the flap 4 and the support portion 3. Furthermore, as clearly shown in FIG. 4 , the flap 4 has an abutment portion 42 that abuts against the outer periphery of the tubular portion 202 of the upper nozzle 200 when the plate portion 201 of the upper nozzle 200 is sandwiched between the flap 4 and the support portion 31. In other words, the abutment portion 42 has a shape that follows the outer periphery of the tubular portion 202 of the upper nozzle 200. As shown in FIG. 5 , the flap 4 is provided at two locations so as to sandwich the tubular portion 202 of the upper nozzle 200.

[0013] The submerged nozzle exchanging device 1 further includes a rotation stopper 8 for stopping the rotation of the flap 4. Figure 6 shows the relationship between the flap 4 and the rotation stopper 8. Note that the frame 2 is omitted from Figure 6. Figure 7 shows a cross section taken along the BB direction in Figure 6, and Figure 8 shows a cross section taken along the CC direction in Figure 6. Furthermore, Figure 9 shows a cross section taken along the DD direction in Figure 1. As can be seen from Figures 4 and 5, the rotation stoppers 8 are disposed on both sides of each of the two flaps 4, for a total of four locations. The rotation stoppers 8 have wedges 81 that protrude above the flap 4 and come into contact with the flap 4. The tip of the wedge 81 has an upwardly inclined surface 811. In addition, both ends of the flap 4 have downwardly inclined surfaces 44 that meet the inclined surfaces 811 of the wedge 81. By providing the inclined surfaces 811 and 44 at the tip of the wedge 81 and both ends of the flap 4, respectively, the wedge 81 can easily ride up onto the upper side of the flap 4.

[0014] As shown in Figures 6 and 7, the wedge 81 is inserted into a wedge guide 82. Furthermore, the wedge 81 is connected to a wedge bolt 83 inside the wedge guide 82. The wedge bolt 83 is then threaded into a bolt guide 84. Furthermore, the wedge guide 82 and the bolt guide 84 are connected and fixed by two connecting bolts 85, as shown in Figures 6 and 8. The wedge guide 82 and the bolt guide 84 are fixed to the frame 2. Specifically, as shown in Figures 7 and 8, the wedge guide 82 and the bolt guide 84 are fixed to the frame 2 so that the inclined surfaces 811 at the tip ends of the wedges 81 inserted into the wedge guide 82 ride up onto the inclined surfaces 44 at both ends of the flap 4.

[0015] With the rotation stopper 8 having such a configuration, the amount of protrusion of the wedge 81 can be adjusted by adjusting the amount of tightening of the wedge bolt 83 relative to the bolt guide 84. Then, by protruding the wedge 81 until the inclined surface 811 at the tip of the wedge 81 rides on the inclined surfaces 44 at both ends of the flap 4, the rotation of the flap 4 can be stopped. Although not shown, a locking device for the wedge bolt 83 can also be attached to the rotation stopper 8. Known locking devices such as nuts, washers for disc springs, coil springs, etc. can be attached to the wedge bolt 83 to lock it. By attaching a locking device, it is possible to prevent the protrusion amount of the wedge 81 from changing over time due to loosening of the wedge bolt 83. In other words, after the wedge 81 is protruded to a position where it can stop the rotation of the flap 4 by tightening the wedge bolt 83, it is possible to prevent the protrusion amount of the wedge 81 from becoming smaller due to loosening of the wedge bolt 83. This makes it possible to reliably stop the rotation of the flap 4.

[0016] Next, a method for attaching and fixing the upper nozzle 200 to the submerged nozzle exchanging device 1 will be described. When attaching the upper nozzle 200 to the submerged nozzle exchange device 1, the wedge 81 is retracted by operating the wedge bolt 83 to make the flap 4 rotatable. Then, the flap 4 is raised as shown in FIG. 10. Next, the upper nozzle 200 is inserted from above, and the underside of the plate portion 201 of the upper nozzle 200 is supported by the support surface 31 of the support part 3 as shown in FIG. 2. Thereafter, the positioning bolt 9 shown in FIG. 11 positions the plate portion 201 of the upper nozzle 200 in the attachment direction X of the submerged nozzle 300. Note that the plate 2, flap 4, rotation stopper 8, etc. are omitted from FIG. 11. After positioning, the flap 4 is folded down. As a result, the plate portion 201 of the upper nozzle 200 is sandwiched between the support surface 31 of the support portion 3 and the parallel surface 41 of the flap 4. At this time, the abutment portion 42 of the flap 4 abuts against the outer periphery of the tubular portion 202 of the nozzle 200. This positions the plate portion 201 of the upper nozzle 200 in the direction Y perpendicular to the attachment direction X of the submerged nozzle 300. Furthermore, when the plate portion 201 of the upper nozzle 200 is sandwiched, the parallel surface 41 of the flap 4 becomes parallel to the support surface 31 of the support portion 3. Furthermore, when the plate portion 201 of the upper nozzle 200 is sandwiched, the parallel surface 41 of the flap 4 and the support surface 31 of the support portion 3 become parallel to the upper and lower surfaces of the plate portion 201 of the upper nozzle 200. After clamping the plate portion 201 of the upper nozzle 200 in this manner, the wedge 81 is protruded by operating the wedge bolt 83. Specifically, the wedge 81 is protruded until the inclined surfaces 811 at the tip of the wedge 81 ride up onto the inclined surfaces 44 at both ends of the flap 4. This ensures that the upper nozzle 200 is securely fixed to the submerged nozzle exchanging device 1.

[0017] After the upper nozzle 200 is fixed, the submerged nozzle exchange device 1 is attached to the lower part of the molten steel discharge port 101 of the tundish 100. Specifically, the tubular part 202 of the upper nozzle 200 is inserted into the molten steel discharge port 101 of the tundish 100. Then, the frame 2 of the submerged nozzle exchange device 1 is fixed to the steel shell 102 at the bottom of the tundish 100 with bolts or the like.

[0018] As described above, the submerged nozzle exchanging device 1 of this embodiment fixes the plate portion 201 of the upper nozzle 200 by sandwiching the plate portion 201 of the upper nozzle 200 between the support surface 31 of the support part 3 and the parallel surface 41 of the flap 4, which are parallel to each other, and therefore is less likely to apply load when fixing the plate portion 201. Therefore, damage to the plate portion 201 of the upper nozzle 200 can be suppressed. Furthermore, the flap 4 has an abutting portion 42 that abuts against the outer periphery of the tubular portion 202 of the upper nozzle 200 when the flap 4 sandwiches the plate portion 201 of the upper nozzle 200, making it possible to position the upper nozzle 200 when fixing the upper nozzle 200. Furthermore, the abutting portion 42 has a shape that fits along the outer periphery of the tubular portion 202 of the upper nozzle 200, making it possible to reliably position and fix the upper nozzle 200.

[0019] Furthermore, since the flap 4 is rotatable relative to the support part 3, it is possible to easily sandwich the plate part 201 of the upper nozzle 200. In other words, simply by rotating the flap 4, the parallel surface 41 of the flap 4 comes into contact with the upper surface of the plate part 201, and the plate part 201 can be sandwiched between the flap 4 and the support surface 31 of the support part 3. Furthermore, the submerged nozzle replacement device 1 of this embodiment is equipped with a rotation stopper 8 that stops the rotation of the flap 4, thereby reliably maintaining the state in which the plate portion 201 is clamped and fixed. Furthermore, the rotation stopper 8 allows the protrusion amount of the wedge 81 to be adjusted by adjusting the tightening amount of the wedge bolt 83, thereby easily and reliably stopping the rotation of the flap 4. In Patent Document 1, the flap rotation is prevented by abutting a cam against a clamp slot. However, this method may result in the cam unexpectedly rotating and releasing the upper nozzle. Furthermore, the flap is fixed by hammering it in, which places a heavy burden on the operator. In contrast, in this embodiment, the flap 4 is held down from above by the wedge 81. The wedge 81 is then connected to the wedge bolt 83, and the protrusion amount of the wedge 81 is adjusted by rotating the wedge bolt 83. This reduces the possibility of the flap 4 unexpectedly rotating and releasing the upper nozzle 200. Furthermore, safety is enhanced because there is no need to fix it by hitting it with a hammer or the like. By attaching a lock to the wedge bolt 83, the possibility of the upper nozzle 200 being released from its fixed position can be further reduced.

[0020] Next, another embodiment of the present invention will be described. Figure 12 shows the main part of a submerged nozzle exchanging device according to another embodiment of the present invention. In this embodiment, convex portions 45 are provided on the parallel surfaces 41 of the flap 4, and concave portions 203 are provided on the upper surface of the plate portion 201 of the upper nozzle 200. The convex portions 45 are provided at two locations on both sides of the parallel surfaces 41, for a total of four locations, and the concave portions 203 are provided at four locations corresponding to the four convex portions 45, respectively. When the plate portion 201 of the upper nozzle 200 is sandwiched, each convex portion 45 fits into each concave portion 203.

[0021] In this way, by fitting the convex portion 45 into the concave portion 203 when sandwiching the plate portion 201 of the upper nozzle 200, it is possible to easily position the plate portion 201 of the upper nozzle 200. Therefore, the positioning bolt 9 shown in Figure 11 can be omitted. Furthermore, by fitting the convex portion 45 into the concave portion 203, the positional displacement between the flap 4 and the plate portion 201 is less likely to occur.

[0022] In this embodiment, the convex portions 45 are provided on the parallel surfaces 41 of the flap 4, and the concave portions 203 are provided on the upper surface of the plate portion 201 of the upper nozzle 200, but conversely, concave portions may be provided on the parallel surfaces 41 of the flap 4, and convex portions may be provided on the upper surface of the plate portion 201 of the upper nozzle 200. When providing convex portions on the upper surface of the plate portion 201 of the upper nozzle 200, the plate portion 201 is usually covered with a metal case, and therefore the convex portions can be provided on the metal case by welding or the like.

[0023] In the above embodiment, the plate portion 201 of the upper nozzle 200 is flat, but the submerged entry nozzle exchanging device of the present invention can also be used for an upper nozzle 200 with an inclined plate portion 201. In this case, it is preferable to design the surface of the flap 4 so that it is parallel to the plate portion. [Explanation of symbols]

[0024] 1 Submerged nozzle replacement device 2 frames 3 Support part 31 Support surface 4 Flap 41 Parallel Planes 42 Contact part 43 Rotating Pin 44 Slope 45 Convex part 5 guide rails 51 Entrance 52 Discharge section 53 Middle section 54 Pressing member 6 Spring box 61 Coil spring (elastic body) 7 Hydraulic cylinder (drive unit) 71 Rotation axis 8 Rotation stopper 81 Wedge 811 Slope 82 Wedge Guide 83 Wedge bolt 9 Positioning bolt 100 tundish 101 Molten steel outlet 102 Iron shell (bottom of tundish) 200 upper nozzle 201 Plate section 202 Tubular part 203 Recess 300 Submerged Entry Nozzle 301 Plate section 302 Tubular part

Claims

1. A submerged entry nozzle replacement device attached to a lower part of a molten steel discharge port of a tundish, A support portion and a flap are provided, the support portion has a support surface that supports a lower surface of a plate portion of the upper nozzle that is inserted into the molten steel discharge port, the flap is rotatable relative to the support; a rotation stopper for the flap; the rotation stopper includes a wedge that protrudes above the flap and abuts against the flap, and a bolt that is connected to the wedge; The amount of protrusion of the wedge can be adjusted by adjusting the amount of tightening of the bolt, the flap has a parallel surface that is parallel to the support surface of the support portion when the flap sandwiches the plate portion of the upper nozzle, and an abutment portion that abuts against the outer periphery of the tubular portion of the upper nozzle, the abutment portion has an arc-like shape that fits along the outer periphery of the tubular portion of the upper nozzle.

2. 2. The submerged nozzle replacement device according to claim 1, wherein the bolt is threadedly engaged with a bolt guide, and a locking device for preventing the bolt from loosening is attached to the rotation stopper.

3. The wedge is inserted into a wedge guide; the bolt guide and the wedge guide are fixed to a frame; The submerged entry nozzle exchange device according to claim 2 , wherein the frame is fixed to the bottom of the tundish.

4. 4. The submerged nozzle replacement device according to claim 1, wherein a surface of the flap has a recess or a convex portion that fits into a protrusion or a concave portion provided on an upper surface of a plate portion of the upper nozzle.

5. An upper nozzle fixed to the submerged nozzle exchange device according to claim 4, a tubular portion and a plate portion; The upper nozzle has a convex or concave portion on the upper surface of the plate portion that fits into a concave or convex portion provided on the surface of the flap.

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