Tundish cleaning device and tundish cleaning method using the same

Abstract

To provide a tundish cleaning device capable of enhancing removal efficiency of a blockage fastened to inside of a sleeve.SOLUTION: A tundish cleaning device 10 removes a blockage 9 such as base metal fastened to inside of a hollow cylindrical sleeve 6 making a molten metal receiving chamber 2 to which molten metal is injected communicating with a molten metal tapping chamber 3 for injecting molten metal of a tundish 1 having the molten metal receiving chamber 2 and the molten metal tapping chamber 3. The tundish cleaning device 10 includes a tilting device 80 for tiltably holding the tundish 1, and a burner support member 12 having a burner head 19 arranged at a position facing an end opening of the sleeve 6, and the burner support member 12 is mounted so as to follow tilting of the tundish 1.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a tundish cleaning device for removing clogging materials such as metals adhering to the inside of a sleeve of a tundish, and a tundish cleaning method using the same. [Background technology]

[0002] In the casting process using a continuous casting machine, a tundish is used between the ladle and the mold for the purpose of removing inclusions, etc. One type of tundish is equipped with a receiving chamber into which molten metal is poured from the ladle and a tapping chamber from which the molten metal is poured into the mold, and a hollow cylindrical sleeve is provided in a weir separating the receiving chamber from the tapping chamber as a flow path for molten steel to pass through. In a tundish of this type, continued use causes clogging material such as raw metal to adhere to the inner surface of the sleeve, reducing the cross-sectional area of the sleeve. Therefore, in order to reuse the tundish, it is necessary to carry out work to remove the clogging material from inside the sleeve after casting is completed (tundish cleaning work).

[0003] The method used to remove blockages from inside the sleeve is to melt them with a high-temperature combustion burner. Specifically, forward cleaning is performed by injecting a burner flame into the sleeve from one side (the receiving chamber side) of the sleeve, melting the blockages and scattering them to the other side (the outlet side), thereby removing the blockages inside the sleeve. If the blockages cannot be completely removed by this forward cleaning, a burner is installed on the other side of the sleeve (the outlet chamber side), and reverse cleaning is performed by injecting a burner flame into the sleeve from the other side of the sleeve. However, since the sleeve is usually inclined downward from the receiving chamber to the discharging chamber, there is a problem that blockages tend to remain inside the sleeve during backwashing, which is an upward slope, reducing cleaning efficiency. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-300112 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in light of the above circumstances and aims to provide a tundish cleaning device that can improve the efficiency of removing clogging matter stuck inside a sleeve, and a tundish cleaning method using the same. [Means for solving the problem]

[0006] The tundish cleaning device of the present invention is a tundish cleaning device for removing clogging materials such as ingots adhered to a hollow cylindrical sleeve that communicates with a molten metal receiving chamber into which molten metal is poured and a molten metal tapping chamber from which the molten metal is poured, and the device is configured as follows: a tilting device that holds the tundish tiltably, and a burner support member that positions a burner head at a position facing the end opening of the sleeve, The burner support member is attached so as to be able to follow the tilting of the tundish.

[0007] According to the tundish cleaning apparatus of the present invention thus defined, when the tundish is tilted using the tilting device, the burner support member follows the tilting of the tundish, so that the tundish can be cleaned with the sleeve tilted at any angle, thereby avoiding a decrease in cleaning efficiency due to the sleeve being tilted upward during cleaning.

[0008] Here, in the present invention, the burner support member can be configured to include a first member extending along the upper surface of the tundish, and a second member connected to one end of the first member, extending in a direction intersecting the longitudinal direction of the first member, and holding a burner head at its tip.

[0009] In addition, the present invention can further include a base frame disposed between the tundish and the first member, the base frame being capable of adjusting the inclination of a lower mounting surface in contact with the tundish and an upper mounting surface in contact with the first member. In this way, the angle of the burner flame entering the sleeve can be adjusted to match the inclination angle of the sleeve.

[0010] In addition, in the present invention, the first member of the burner support member can be configured to include a support member having a guide rail and fixed to the base frame, and a first member main body that can move longitudinally along the guide rail. In this way, the position of the burner head can be adjusted in the direction toward or away from the sleeve.

[0011] Here, in the present invention, the first member of the burner support member is configured to have a gear provided on the first member body and a rack provided on the support member and meshing with the gear, The gear rotates in a state in which the gear and the rack are meshed with each other, thereby making it possible to move the first member body.

[0012] In the present invention, the second member constituting the burner support member can also be connected to a rotatable shaft portion protruding from one end side of the first member, and the length from the connection portion with the first member to the burner head can be adjusted. In this way, the burner head can be aligned with the end opening of the sleeve by adjusting the rotation angle of the second member and the length to the burner head.

[0013] The tundish cleaning method of the present invention is a cleaning method using the above-mentioned tundish cleaning apparatus, placing the tundish on a tiltable mounting plate; a step of disposing the burner support member so that the burner head faces one end opening of the sleeve, and tilting the tundish so that the sleeve is inclined downward from the one end opening toward the other end opening, and melting the clogging material stuck inside the sleeve with a flame from the burner head so that the clogging material flows out of the sleeve and is removed; The method is characterized by comprising the steps of: positioning the burner support member so that the burner head faces the other end opening of the sleeve; tilting the tundish so that the sleeve slopes downward from the other end opening toward the one end opening; and melting any obstructions remaining in the sleeve with a flame from the burner head and causing them to flow out and be removed from the sleeve.

[0014] According to the tundish cleaning method of the present invention defined as described above, cleaning is performed with the burner head facing one end opening of the sleeve (forward cleaning), and cleaning is performed with the burner head facing the other end opening of the sleeve (reverse cleaning).In either case, cleaning is performed with the sleeve inclined downward, so that a decrease in cleaning efficiency caused by the sleeve being inclined upward can be avoided. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing an outline of an example of a tundish to which a tundish cleaning device according to one embodiment of the present invention is attached. [Figure 2] 2A and 2B are cross-sectional views of the tundish, in which (A) is a cross-sectional view taken along line AA in FIG. 1, and (B) is a cross-sectional view taken along line BB in FIG. [Figure 3] 2 is a view showing a burner support member and a base frame that constitute the tundish cleaning device according to one embodiment of the present invention, in a separated state. FIG. [Figure 4] 4 is an enlarged view of a connecting portion between a first member and a second member in the burner support member of FIG. 3. FIG. [Figure 5] FIG. 4 is a plan view of the burner support member of FIG. 3. [Figure 6]6 is a cross-sectional view taken along the line VI-VI in FIG. 3. [Figure 7] 4 is a diagram showing a range within which a lance can be rotated in the burner support member of FIG. 3. FIG. [Figure 8] 4(A) is a diagram showing the base frame of FIG. 3. FIG. 4(B) is a diagram showing the base frame in a state where the inclination of the upper mounting surface has been changed. [Figure 9] FIG. 2 is a view showing a state in which the tundish cleaning apparatus of the embodiment is attached to a tundish to be cleaned. [Figure 10] FIG. 2 is an explanatory diagram of a method for cleaning a tundish. DETAILED DESCRIPTION OF THE INVENTION

[0016] Next, a tundish cleaning device according to one embodiment of the present invention will be described in detail with reference to the drawings. Figures 1 and 2 show an example of a tundish to which the tundish cleaning device of this embodiment is attached. Figure 1 is a perspective view, and Figure 2 shows cross sections AA and BB in Figure 1.

[0017] The tundish 1 has two spaces: the molten metal receiving chamber 2 and the molten metal tapping chamber 3. The molten metal receiving chamber 2 and the molten metal tapping chamber 3 are separated by a weir 5, and two hollow cylindrical sleeves 6 are embedded in the weir 5 as a flow path connecting the molten metal receiving chamber 2 and the molten metal tapping chamber 3. These two sleeves 6 are arranged parallel to each other. The walls of the sleeves 6 are made of insulating refractory material. As shown in Figure 2(A), these sleeves 6 are inclined downward at an angle θ1 from the molten metal receiving chamber 2 side to the molten metal tapping chamber 3 side.

[0018] In the tundish 1, molten steel M is poured from a ladle (not shown) into the receiving chamber 2 and stored in the tundish 1. The molten steel M then flows out through a hole (not shown) provided in the bottom of the tapping chamber 3 and is poured into a mold. As the molten steel M passes through the sleeve 6 and moves from the receiving chamber 2 to the tapping chamber 3, impurities such as inclusions in the molten steel M are separated. When a tundish 1 of this type is continuously used, impurities, ingots, etc., solidify and accumulate inside the sleeve 6 as blockages. For this reason, in order to reuse the tundish 1, it is necessary to periodically remove the blockages inside the sleeve 6.

[0019] A tundish cleaning apparatus 10 according to one embodiment of the present invention is used to remove clogging matter stuck inside the sleeve 6, and its main components are a tilting device 80, a burner support member 12, and a base frame 14. Fig. 3 is a diagram showing the burner support member 12 and the base frame 14, which constitute the tundish cleaning apparatus 10, separated from each other. The burner support member 12 is attached to the upper surface 7 of the tundish 1, more specifically, to the upper surface 7a of the weir 5, via the base frame 14.

[0020] Next, we will explain the burner support member 12. The burner support member 12 includes a first member 18 that extends in the left-right direction in the figure along the top surface 7 of the tundish 1, and a second member 20 that holds a burner head 19 at its tip and extends in a direction intersecting the longitudinal direction of the first member 18.

[0021] The second member 20 has a rod-shaped lance 22 that extends vertically while attached to the tundish 1, and the burner head 19 is provided at the tip of the lance 22. As shown in the partially enlarged view of Figure 3, a large-diameter hole 24 for ejecting high-pressure oxygen is formed in the surface of the burner head 19 that faces the sleeve 6, and a plurality of small-diameter flame holes 25 are formed surrounding this hole 24. The fuel gas, oxygen, water, and high-pressure oxygen to be supplied to the burner head 19 are sent from above the lance 22 to the burner head 19 through a gas pipe 27, an oxygen pipe 28, water supply pipes 29a and 29b, and a high-pressure oxygen pipe 30, respectively.

[0022] A length adjustment section 32 is provided on the base end side of the lance 22, at the portion where it connects to the first member 18. The length adjustment section 32 is located between the first member 18 and the lance 22, and is fitted with a shaft section 47 extending from the first member 18 side (see FIG. 4). As shown in FIG. 3, the length adjustment section 32 has a guide rail 34 formed on its side that extends in the vertical direction, and an engagement block 35 that engages with the guide rail 34 is attached to the lance 22, so that the lance 22 is slidable in the vertical direction relative to the length adjustment section 32 in the figure.

[0023] As shown in Figure 4, a shaft 38 connected to an operating handle 37 is provided inside the length adjustment unit 32 and is parallel to the longitudinal direction of the lance 22. A male thread 38a is formed on the outer circumferential surface of the shaft 38, and a nut 39 having a female thread formed on the inner circumferential surface is fitted onto this male thread 38a. The nut 39 is fixed integrally with the lance 22, and when the shaft 38 is rotated by the operating handle 37, the nut 39 moves along the axial direction of the shaft 38 due to a screw feed action, and as a result, the length L from the shaft portion 47 of the first member 18 to the burner head 19 is adjusted.

[0024] On the other hand, as shown in Figure 3, the first member 18 includes a first member main body 42 that holds the second member 20, and a support member 43 that is provided below the first member main body 42 and supports the first member main body 42 so that it can slide.

[0025] The first member body 42 includes two square pipes 45 extending parallel to each other in the left-right direction in the figure, and these square pipes 45 are connected by a base plate 46. A shaft 47 used for connecting to the second member 20 is provided at the end of the square pipe 45 on the right side in the figure (see FIG. 4). The connecting shaft 47 is connected via a worm reducer 50 to a rotating shaft 49 that rotates based on operation of an operating handle 48 attached to the square pipe 45. By rotating the operating handle 48, the shaft 47 rotates, and the second member 20 (the length adjustment unit 32 and the lance 22) connected to the shaft 47 can rotate around the shaft 47. In this example, based on the mechanism for rotating the second member 20, the burner head 19 at the tip of the lance 22 can be moved around the shaft 47, as shown in FIG. 7. Such rotational movement of the burner head 19 makes it easier to align the burner head 19 when cleaning two sleeves 6, 6 provided on the tundish 1, as shown in Figure 2(B).

[0026] As shown in Figure 3, a weight 67 is provided at the end of the square pipe 45 on the left side in the figure, and a ring member 68 for hanging a crane hook is provided at the center of the square pipe 45 in the longitudinal direction.

[0027] The support member 43 is a member that is fastened and fixed to the base frame 14. The support member 43 has a guide rail 61 attached to the upper surface (the surface facing the first member main body 42) of a base plate 60. As shown in FIG. 6, two guide rails 61 are attached and arranged parallel to each other and extending in the longitudinal direction of the first member main body 42. Meanwhile, an engagement block 51 that engages with the guide rail 61 is attached to the lower surface (the surface facing the guide rail 61) of the base plate 46 on the first member main body 42 side, and the first member main body 42 is slidable in the left-right direction in FIG. 3 relative to the support member 43.

[0028] 6, a shaft 54 extends downward from the first member body 42, and a gear 55 is provided at the tip of the shaft 54. Meanwhile, a rack 62 that meshes with the gear 55 is provided on the support member 43. The shaft 54 is connected via a worm reducer 59 to a rotating shaft 58 that rotates based on operation of an operating handle 57 attached to the square pipe 45. By rotating the operating handle 57, the gear 55 rotates with the gear 55 and the rack 62 meshing with each other, and the first member body 42 is movable relative to the support member 43 (i.e., relative to the base frame 14).

[0029] Next, the base frame 14 will be described. The base frame 14 is a member disposed between the tundish 1 and the first member 18 of the burner support member 12, and as shown in Fig. 3, two receiving members 71, 72 are disposed on the upper surface of a base plate 70. The receiving members 71, 72 are disposed spaced apart in the longitudinal direction, and a recess formed by these receiving members 71, 72 can accommodate the support member 43 of the burner support member 12. The support member 43 is fixed to the receiving members 71, 72 by fastening members 73 or the like.

[0030] 8(A), in this example, a wedge member 75A is disposed between the receiving member 71 and the base plate 70, and the inclination of the bottom surface 76 of the recess that receives the support member 43 (the inclination relative to the base plate 70) is adjusted to correspond to the inclination θ1 of the sleeve 6 formed in the tundish 1. Note that, in the base plate 70 of this example, as shown in FIG. 8(B), it is also possible to change the inclination of the bottom surface 76 of the recess to θ2 by disposing a wedge member 75B between the receiving member 71 and the base plate 70 and disposing a wedge member 75C between the receiving member 72 and the base plate 70.

[0031] In this example, the base frame 14 is fixed to the tundish 1 with bolts. As a result, the base frame 14 is integrally attached to the upper surface 7 of the tundish 1, and the burner support member 12 is attached to the upper surface 7 of the tundish 1 via the base frame 14. Therefore, when the tundish 1 tilts, the burner support member 12 including the burner head 19 tilts following the tundish 1.

[0032] Next, a method for cleaning a tundish using the tundish cleaning device 10 will be described. 9 is a diagram showing a state in which the tundish cleaning device 10 is attached to a tundish 1 to be cleaned. In the figure, a tilting device 80 includes a mounting plate 81 on which the tundish 1 is mounted, a pair of support shafts 82 that support the mounting plate 81 so that the mounting plate 81 can tilt, and a drive mechanism (not shown) that rotationally drives the support shafts 82.

[0033] When cleaning the tundish, first, the tundish 1 is placed on a placement plate 81 as shown in FIG. Next, the base frame 14 is attached to the upper surface 7 of the tundish 1 placed on the mounting plate 81, and the burner support member 12 is attached via the base frame 14. At this time, the burner support member 12 is attached so that the lance 22 faces the molten metal receiving chamber 2. Then, the position is adjusted so that the burner head 19 at the tip of the lance 22 faces the end opening of the sleeve 6 on the molten metal receiving chamber 2 side.

[0034] Next, as shown in Figure 10(I), the tundish 1 is tilted together with the mounting plate 81. Specifically, the tundish 1 is tilted at a predetermined downward angle from the end opening of the sleeve 6 on the side of the molten metal receiving chamber 2 toward the end opening on the side of the molten metal discharging chamber 3. In this state, forward cleaning is performed by blowing a flame from the burner head 19 into the sleeve 6, melting the clogging material 9 (see Figure 9) stuck inside the sleeve 6 and removing it by flowing it out of the sleeve.

[0035] Next, the burner support member 12 is temporarily removed from the base frame 14, and then attached to the base frame 14 so that the lance 22 is positioned on the molten metal tapping chamber 3 side. Then, the position is adjusted so that the burner head 19 at the tip of the lance 22 faces the end opening of the sleeve 6 on the molten metal tapping chamber 3 side.

[0036] Next, as shown in Figure 10 (II), the tundish 1 is tilted together with the mounting plate 81. Specifically, the tundish 1 is tilted at a predetermined downward angle from the end opening of the sleeve 6 on the side of the discharge chamber 3 to the end opening on the side of the receiving chamber 2. In this state, reverse cleaning is performed by blowing flames from the burner head 19 into the sleeve 6, so that the blockages 9 that could not be completely removed by the forward cleaning can be melted and removed outside the sleeve.

[0037] As described above, according to the tundish cleaning apparatus 10 of this embodiment, when the tundish 1 is tilted using the tilting device 80, the burner support member 12 follows the tilting of the tundish 1, so that the tundish 1 can be cleaned with the sleeve 6 to be cleaned tilted at any angle. This makes it possible to avoid a decrease in cleaning efficiency caused by the sleeve 6 to be cleaned being tilted upward during cleaning.

[0038] In the tundish cleaning device 10 of this embodiment, a base stand 14 is provided between the tundish 1 and the first member 18, which allows the inclination of the lower mounting surface 77 that contacts the tundish 1 and the upper mounting surface 76 that contacts the first member 18 to be adjusted, so that the angle of the burner flame blowing into the sleeve 6 can be adjusted to match the inclination angle θ1 of the sleeve 6.

[0039] In the tundish cleaning device 10 of this embodiment, the first member 18 of the burner support member 12 is configured to include a support member 43 having a guide rail 61 and fixed to the base frame 14, and a first member body 42 that can move longitudinally along the guide rail 61, and the first member 18 of the burner support member 12 is further configured to include a gear 55 provided on the first member body 42 and a rack 62 provided on the support member 43 and meshing with the gear 55, and the gear 55 rotates while the gear 55 and the rack 62 are meshed with each other, thereby moving the first member body 42, and the position of the burner head 19 can be adjusted in the direction toward or away from the sleeve 6.

[0040] In the tundish cleaning device 10 of this embodiment, the second member 20 constituting the burner support member 12 is connected to a rotatable shaft portion 47 protruding from one end side of the first member 18, and the length from the connection portion with the first member 18 to the burner head 19 is adjustable, so that the burner head 19 can be aligned with the end opening of the sleeve 6 by adjusting the rotation angle of the second member 20 and the length to the burner head 19.

[0041] Furthermore, according to the tundish cleaning method using the tundish cleaning apparatus 10 of this embodiment, forward cleaning is performed with the burner head 19 facing one end opening of the sleeve 6, and reverse cleaning is performed with the burner head 19 facing the other end opening of the sleeve 6. Since both cleaning operations are performed with the sleeve 6 inclined downward, it is possible to avoid a decrease in cleaning efficiency caused by the sleeve 6 being inclined upward.

[0042] Although the tundish cleaning apparatus and the tundish cleaning method of this embodiment have been described in detail above, the present invention is not limited to the above embodiment and can be carried out in various modified forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0043] 1 tundish 2 Bath room 3. Bath room 6 sleeves 9 Obstruction 10 Tundish cleaning equipment 12 Burner support member 14 Base stand 18 First member 19 Burner Head 20 Second member 47 Shaft 55 Gears 61 Guide rail 62 racks 76 Upper mounting surface (bottom surface) 77 Lower mounting surface 80 Tilt device 81 Loading plate M Molten steel

Claims

1. A tundish cleaning device for removing clogging materials containing base metals that have adhered to a hollow cylindrical sleeve that communicates with a molten metal receiving chamber into which molten metal is poured and a molten metal tapping chamber from which the molten metal is poured, the device comprising: a tilting device having a mounting plate and tiltably holding the tundish mounted on the mounting plate; a base stand attached to an upper surface of the tundish opposite to a surface that contacts the loading plate; a burner support member that is attached to the upper surface of the tundish via the base frame and that positions a burner head at a position facing the end opening of the sleeve, In the tundish cleaning device, when the tundish is tilted, the burner support member tilts integrally with the tundish, thereby enabling the burner support member to follow the tilting of the tundish.

2. The burner support member is a first member extending along an upper surface of the tundish; 2. The tundish cleaning apparatus according to claim 1, further comprising: a second member connected to one end of the first member, extending in a direction intersecting the longitudinal direction of the first member, and holding a burner head at a tip end thereof.

3. A tundish cleaning device as described in Claim 2, wherein the base frame is arranged between the tundish and the first member, and the inclination between the lower mounting surface contacting the tundish and the upper mounting surface contacting the first member is adjustable.

4. The first member of the burner support member is a support member provided with a guide rail and fixed to the base frame; The tundish cleaning apparatus according to claim 3 , further comprising: a first member body that is longitudinally movable along the guide rail.

5. The first member of the burner support member is a gear provided on the first member body; a rack provided on the support member and meshing with the gear; The tundish cleaning apparatus according to claim 4 , wherein the first member body is movable by rotation of the gear in a state in which the gear and the rack are meshed with each other.

6. 6. The tundish cleaning device according to claim 2, wherein the second member constituting the burner support member is connected to a rotatable shaft portion protruding from one end side of the first member, and the length from the connecting portion with the first member to the burner head is adjustable.

7. A tundish cleaning method using the tundish cleaning apparatus according to any one of claims 1 to 6, placing the tundish on the tiltable loading plate; a step of disposing the burner support member so that the burner head faces one end opening of the sleeve, and tilting the tundish so that the sleeve is inclined downward from the one end opening toward the other end opening, and melting the clogging material stuck inside the sleeve with a flame from the burner head so that the clogging material flows out of the sleeve and is removed; a step of disposing the burner support member so that the burner head faces the other end opening of the sleeve, and tilting the tundish so that the sleeve is inclined downward from the other end opening toward the one end opening, and melting the clogging material remaining in the sleeve with a flame from the burner head so that the clogging material flows out of the sleeve and is removed; A method for cleaning a tundish comprising:

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