JP4608261B2 - Molten metal container outlet structure and sleeve exchange device for molten metal container outlet - Google Patents

Description

  The present invention relates to a discharge port structure for discharging molten metal from a molten metal container such as a converter, and more particularly to a discharge port structure made of a replaceable sleeve-like refractory and a replacement device for the sleeve-like refractory.

  When refining molten metal such as molten steel, a high-temperature molten metal is transported to a refining furnace such as a converter in a transfer container such as a ladle, and the molten metal is transferred from the transfer container and refined. The molten metal that has been refined and refined is again discharged into the transfer container and conveyed to the next step.

  As described above, the processing cycle of the smelting furnace basically includes three steps of receiving, refining, and discharging molten metal.

  In the case of a steelmaking converter as a typical example, the processing cycle time of this refining furnace is about 5 minutes for receiving hot metal (receiving steel), about 30 minutes for refining (blowing), and discharging (outgoing steel). It takes about 7.5 minutes and the entire process cycle takes about 42.5 minutes.

  Thus, in the entire processing cycle of this steelmaking converter, the ratio of steel receiving time is about 12%, and the steel output time accounts for about 18%. The receiving and discharging steel, that is, receiving and discharging is a process only for transporting the molten metal, and the time required for transporting the molten metal is not directly related to the basic function of the converter. It's a waste of time.

  Therefore, shortening the time required to transport the molten metal in the refining process will improve the operation efficiency of the converter, increase the annual refining throughput per converter, and increase productivity. This will lead to improvement and cost reduction.

  However, in this refining process, in order to shorten the time required for receiving and discharging, not only the time for receiving and discharging is shortened, but there are matters to be noted separately for each.

  First, in the acceptance process of transferring the molten metal from the transfer container to the converter, the transfer container is tilted and the molten metal is injected into the converter, but the flow control is performed so as not to damage the converter refractory. Requires detailed management.

  In addition, in the discharge process in which the molten metal is transferred from the converter to the transfer container, it is necessary to prevent a large amount of slag generated in the refining process from flowing out to the transfer container. At the same time, it is necessary to discharge the molten metal so that it does not disturb the molten metal due to turbulence in the flow of molten metal during the outflow and the molten metal is oxidized and the quality is not significantly reduced.

  As described above, there is a converter in which a molten metal receiving part and a discharge port are separately provided in order to easily cope with different management conditions in receiving and discharging a refining metal.

  Such a converter has a structure in which the inner diameter or opening area of the discharge port is limited so that the outflow of slag from the discharge port is reduced and the discharge flow is as laminar as possible.

  In the case of a converter, the outlet steel outlet, which is a discharge outlet, is significantly worn chemically and mechanically due to the intense flow of high-temperature molten steel, and the diameter of the outlet steel outlet gradually increases. When the opening area of the steel outlet is gradually increased, the discharge time is shortened by increasing the discharge flow rate.

  However, when the opening area of the steel outlet is increased to a predetermined area, a vortex is generated around the steel outlet by vigorous flow, entraining the slag on the surface of the molten steel and discharging a large amount of slag to the transfer container. Since this slag adversely affects the quality of the metal, it is necessary to avoid slag entrainment and temporary discharge of molten steel.

  In other words, when the refractory at the steel outlet is melted at each steel outlet and the opening area is expanded, an allowable upper limit for the opening area is set, and when the opening area reaches the allowable upper limit, Although it shortens with increasing, the allowable lower limit of the steel output time is specified from the relationship between the allowable upper limit of the opening area and the steel output time, and when the steel output time reaches this allowable lower limit, Must be replaced with a new one, and the inner diameter of the steel outlet, that is, the opening area must be returned to the original condition.

  In addition, in order to prevent the slag from flowing out when steel is discharged, it is common not to provide a valve or the like for blocking molten steel or slag flow, and the tilting or rotation timing of the converter itself is adjusted. Is done by that. In this way, the prevention of slag outflow during actual steelmaking is to tilt or rotate the converter itself after detecting the slag being caught in the molten steel flow. It is unavoidable that it is discharged into a molten steel transfer container.

  The amount of slag discharged to the transfer container is substantially proportional to the opening area of the steel outlet and depends on the tilting of the converter or the ability of the rotation speed. Therefore, in order to keep the amount of slag discharged to the transfer container below a certain amount, it is necessary to set the upper limit value of the opening area of the steel outlet in consideration of the facility capacity of the converter. Moreover, the allowable upper limit of the opening area of the steel outlet for making the amount of this slag not more than a certain amount varies depending on the facility capacity of the converter.

  Furthermore, it takes a long time to replace the steel outlet when the opening area reaches the allowable upper limit due to melting of the steel outlet. Amount) is reduced.

  Therefore, conventionally, various measures for shortening the time for exchanging the steel outlet are taken. For example, Patent Document 1 discloses a structure in which a steel outlet is formed from a replaceable sleeve refractory, and the replacement time of the steel outlet is shortened by replacing the sleeve refractory. Yes. Furthermore, it is disclosed that a material having a long life with little wear against the outflow of metal is selected so that the replacement frequency of the sleeve-like refractory can be reduced.

In order to speed up the replacement of such a sleeve, for example, when replacing a nozzle in a tundish disclosed in Patent Document 2 or Patent Document 3, it is considered to employ a method of pushing out an old nozzle with a new nozzle. It was.
Japanese Patent Laid-Open No. 5-195038 JP 2001-150108 A Japanese Patent Laid-Open No. 10-286658

In the method of replacing the sleeve-like refractory, in order to further increase the life of the sleeve-like refractory itself, a new steel outlet diameter has a small diameter corresponding to the longest allowable outflow time, It is designed to be thick. Usually, in converters, the outlet diameter (inner diameter) of the new steel outlet is such that the area of the new steel outlet is about half of the upper limit of the outflow area, or the new outlet time is about twice the lower limit of the outflow time. For this reason, for example, in the sleeve-like refractory for 200 heat use, the first steeling time is as long as 10 minutes, but the steeling time is shortened to about 5 minutes at the end of use. The average steel output time represented by the sum of the steel output times / the number of times the sleeve-like refractory is used is 7.5 minutes.

  In this case, if the shortest steel-making time in which no slag is mixed in the converter is 5 minutes, a steel-making time of 2.5 minutes / heat is wasted.

  Furthermore, conventionally, the time required for replacing the sleeve-like refractory is usually 50 to 100 minutes, and an average of 75 minutes is required. The life of the sleeve-like refractory is 150 to 250 heat, and the average is 200 heat. In a typical steelworks, one converter with a capacity of 300 tons is generally used, and the steel-to-tap is smelted with an average of about 12,000 heat per year for an average of 40 minutes. If the life of the sleeve-like refractory is 200 heats on average, the number of replacements is 60 times / year, and when the time required for replacement is 75 minutes / time on average, the annual operation stoppage time spent for replacement is about 4,500 minutes. Reaches 75 hours.

  If the time required to replace this sleeve-like refractory can be reduced to an average of 37.5 minutes, half the annual shutdown time will be approximately 2,250 minutes and 37.5 hours, which is half. Only the operation of the converter can be increased, and the production volume will also increase. Also, if the life of the refractory refractory can be doubled to an average of 400 heat, the number of replacements will be halved to 30 times / year, and the annual operation time spent for replacement will be 75 minutes / time on average. Similarly, the outage time is about half of 2,250 minutes and 37.5 hours, so that the operation of the converter can be increased by that amount, and the production amount also increases.

  However, this sleeve-shaped refractory is strongly sintered using an irregular refractory such as mortar, and is forced to be replaced at a high temperature. There is a problem that it is extremely difficult to shorten the time.

  Therefore, it has been considered to apply the nozzle changing device described in Patent Documents 2 and 3 to change the sleeve of the steel outlet of the converter, but in the case of the converter, unlike the case of the tundish, Since the temperature is as high as about 50 to 100 ° C. and is continuously operated, the heat resistance of the apparatus becomes a problem. In particular, a spring for pressing the tundish nozzle, an oil cylinder for sliding the dandish nozzle in the horizontal direction, and the like are deteriorated by heat. Although it is conceivable to attach a cooling device, since the converter rotates, there is a problem that the cooling device becomes complicated and large.

  Therefore, the first problem to be solved by the present invention is that in a molten metal container equipped with a sleeve-like refractory serving as a molten metal discharge port, the sleeve-like refractory can be replaced more easily and has excellent heat resistance. Another object is to provide a compact discharge port structure.

  Another object is to provide a sleeve exchanging device that can easily replace a sleeve-like refractory in the discharge port structure.

  In the sleeve-like refractory at the discharge port of the conventional molten metal container, the present invention shortens the average discharge time by starting to use the large opening area to some extent from the beginning, and the inner hole cross-sectional area is reduced from the beginning. Use of a large sleeve shortens the service life, so the frequency of replacement is high. Dividing the sleeve-shaped refractory at the discharge port into two parts, and replacing only the lower sleeve frequently reduces the time required for replacement. In this way, the total efficiency of the converter operation is increased, and the elastic body for crimping the lower sleeve, which has a problem with heat resistance, can be replaced every time the lower sleeve is replaced by being integrated with the lower sleeve. It was completed under the idea of improving.

  That is, the discharge port structure of the molten metal container according to the present invention divides the sleeve-like refractory forming the discharge port of the molten metal container into an upper sleeve and a lower sleeve, and the upper sleeve is attached to the lining refractory of the molten metal container. In the molten metal container discharge port structure in which the lower sleeve is detachably provided at the tip of the upper sleeve, the lower sleeve is engaged with an elastic body for crimping the lower sleeve to the upper sleeve. It is characterized by being held in a metal casing that is a unit integrated with the body.

  The metal housing can be provided with an outside air inlet for introducing outside air into the elastic body.

  The lower sleeve is supported by the rail of the holding unit fixed to the molten metal container and is pressed against the upper sleeve by the reaction force when the elastic body is compressed, along the longitudinal direction of the rail. It can be made detachable from the upper sleeve by being moved.

  Furthermore, the rail can be provided with inclined surfaces that relieve compression of the elastic body at the front and rear ends in the longitudinal direction.

  In the molten metal container discharge port sleeve exchange device according to the present invention, a new sleeve holding portion for holding a new lower sleeve, and a current sleeve receiving portion for receiving a lower sleeve supported by the rail and pressed against the upper sleeve And an old sleeve holding portion that holds the old lower sleeve after replacement in a row, and an actuator that pushes the new lower sleeve held by the new sleeve holding portion toward the current sleeve housing portion, the actuator comprising: By pushing the new lower sleeve into the current sleeve housing portion, the new lower sleeve is supported by the rail and is crimped to the upper sleeve, and the old lower sleeve that has been crimped to the upper sleeve is pushed and held by the old sleeve holding portion. It was made to do.

  This sleeve exchange device is provided with a guide rod that can be held and moved by a manipulator, and can be inserted into a guide horn provided on the molten metal container side. The guide rod can be operated by manipulator operation when replacing the lower sleeve. The guide horn can be loaded and positioned.

  In the present invention, the sleeve-like refractory that forms the discharge port of the molten metal container is divided into two parts in the upper and lower directions, so that the lower sleeve can be made smaller and easy to handle. The replacement time can be reduced by replacing only the lower sleeve. Can be shortened. Further, since the upper sleeve can be formed separately from the lower sleeve, the life can be increased, and the replacement frequency of the upper sleeve can be reduced.

  Furthermore, in the present invention, the elastic body for crimping the lower sleeve, which has a problem with heat resistance, is integrated with the lower sleeve, so that the elastic body can be replaced every time the lower sleeve is replaced. Will improve.

  And according to the sleeve exchange apparatus of this invention, a lower sleeve can be exchanged rapidly.

  As described above, according to the present invention, the operation efficiency of the molten metal container is improved by the quick replacement of only the lower sleeve.

  Hereinafter, the present invention will be described based on examples shown in the attached drawings in which the present invention is applied to a steel outlet of a steelmaking converter.

  FIG. 1 is an exploded perspective view showing an embodiment of the discharge port structure and sleeve replacement device of the present invention, and FIG. 2 is a perspective view showing the upper side of the discharge port structure of FIG.

  As shown in FIGS. 1 and 2, the discharge port structure of the present invention includes an upper sleeve 2 attached to the refractory lining on the converter 1 side, and a lower sleeve 3 detachably attached to the tip of the upper sleeve 2. And have. In addition, the converter shown in FIG.1 and FIG.2 is the vicinity of the steel outlet of a converter, and is a part of converter.

  3A and 3B are views showing the lower sleeve 3, wherein FIG. 3A is a plan view, FIG. 3B is a cross-sectional view taken along the line A-A in FIG. 3A, and FIG. As shown in the figure, the lower sleeve 3 is integrally attached to a metal casing 4 composed of an outer metal frame 4a and an inner metal frame 4b. Further, as shown in FIG. 3C, an elastic body 5 made of a coil spring is mounted between the outer metal frame 4a and the inner metal frame 4b, and the outer metal frame 4a has the elastic body 5 attached thereto. The inner metal frame 4b is accommodated so as to be movable in the vertical direction. Specifically, the elastic body 5 is attached to a guide projection 6 provided so as to protrude from the lower portion of the inner metal frame 4b and is held so as not to be laterally displaced. The guide pin 7 shown in FIG. The guide protrusion 6 is set to a length that does not contact the outer metal frame 4a even if the elastic body 5 contracts within the range of deflection. A total of ten elastic bodies are provided concentrically. The outer metal frame 4a is provided with a cooling horn 8 as an outside air inlet for introducing outside air into the elastic body 5 and cooling it.

  The inner metal frame 4b holds the lower sleeve 3 by a sleeve fixing portion 9 provided on the side thereof. The sleeve fixing portion 9 is composed of a screw mechanism having a sleeve pressing metal 9a at the tip, and the sleeve pressing metal 9a is advanced by the screw mechanism and pressed against the side surface of the lower sleeve 3 to fix the lower sleeve 3 to the inner metal frame 4b. Yes.

  The lower sleeve 3 is made of a refractory material, and a joint surface 3a with the upper sleeve 2 is formed on the upper surface. The joining surface 3a is substantially circular and has two parallel surfaces 3b parallel to the side surfaces. The parallel surface 3b is formed in a direction perpendicular to the moving direction when replacing the lower sleeve, which will be described later, and the length of the parallel surface 3b is larger than the diameter of the nozzle hole 3c provided at the center of the joint surface 3a. ing. By making the length of the parallel surface 3b larger than the diameter of the nozzle hole 3c, the lower sleeve 3 is prevented from being damaged by the pressing force at the time of replacement. If the joint surface 3a is made into a perfect circle without providing the parallel surface 3b on the joint surface 3a, the joint surface 3a is in point contact with the inner metal frame 4b in the moving direction at the time of replacement, so stress concentrates and breaks. It becomes easy to do. In addition, if the length of the parallel surface 3b is shorter than the diameter of the nozzle hole 3c, it becomes easy to communicate with the nozzle hole 3c when a crack occurs from the parallel surface 3b.

  In the present embodiment, the lower sleeve 3 is a single body, but it is also possible to use, for example, an upper surface portion including the bonding surface 3a and a lower cylindrical portion which are separately manufactured with different materials and bonded. Further, when the outer surface is covered with a metal case, a damage suppressing effect can be obtained.

  FIG. 4 is a cross-sectional view of the main part showing the upper sleeve 2. As shown in the figure, the upper sleeve 2 is integrally attached to a metal casing 10 composed of an outer metal frame 10a and an inner metal frame 10b. The outer metal frame 10a is fixed to a base plate 11 fixed to the converter 1 side, and the inner metal frame 10b is attached to the outer metal frame 10a by pins 12 so as to be slightly movable in the vertical direction. Further, the inner metal frame 10b holds the upper sleeve 2 by a sleeve fixing portion 13 provided on the side portion thereof. Since the sleeve fixing portion 13 has the same configuration as the sleeve fixing portion 9 for fixing the lower sleeve 2 described above, description thereof is omitted.

  The upper sleeve 2 is made of a refractory material like the lower sleeve 3, and a joint surface 2 a with the lower sleeve 3 is formed on the lower surface. As shown in FIG. 2, the joint surface 2a is substantially circular and has two parallel surfaces 2b parallel to the side surfaces. The parallel surface 2b is formed in a direction orthogonal to the moving direction when replacing the lower sleeve described later, and the length of the parallel surface 2b is larger than the diameter of the nozzle hole 2c provided at the center of the joint surface 2a. ing.

  The upper sleeve 2 is held by filling an amorphous refractory with the lining refractory of the converter 1.

  FIG. 5 is a cross-sectional view of the main part showing a state in which the lower sleeve 3 is crimped to the lower surface of the upper sleeve 2. The lower sleeve 3 is held by rails 14 a of a pair of holding portions 14 fixed to the base 11. In this state, the outer metal frame 4 a of the metal housing 4 that holds the lower sleeve 3 is pushed upward to compress the elastic body 5. Then, the inner metal frame 4 b is pushed up together with the lower sleeve 3 by the reaction force of the elastic body 5, and the joining surface 3 a of the lower sleeve 3 is securely pressed against the joining surface 2 a of the upper sleeve 2.

  Further, the metal housing 4 holding the lower sleeve 3 can slide along the longitudinal direction of the rail 14a, and the metal housing 4 (lower sleeve 3) is slid along the longitudinal direction of the rail 14a and moved. As a result, the lower sleeve 3 can be replaced. In the embodiment, the liner 26 is provided on the lower surface of the outer metal frame 4a of the metal casing 4 and the surface of the rail 14a, respectively, to facilitate sliding movement and improve wear resistance.

  Furthermore, the rail 14a has the inclined surface 14b in the both ends of a longitudinal direction, as shown in FIG. Since this inclined surface 14b is inclined downward, when the metal casing 4 (lower sleeve 3) is slid along the longitudinal direction of the rail 14a, the metal casing 4 Since the push-up amount of the outer metal frame 4a of 4 is reduced, the compression of the elastic body 5 is relaxed, and the pressure-bonding force of the lower sleeve 3 to the upper sleeve 2 is reduced. Thereby, the lower sleeve 3 can be exchanged smoothly.

  Next, the sleeve exchange device of the present invention will be described.

  As shown in FIG. 1, the sleeve changing device 15 includes a new sleeve holding portion 16 that holds a new lower sleeve when the sleeve is changed, and a current sleeve receiving portion 17 that holds the lower sleeve 3 that is pressure-bonded to the upper sleeve. An old sleeve holding portion 18 for holding a later old lower sleeve is provided in a row on the substrate 19. The new sleeve holding portion 16 and the old sleeve holding portion 18 have guide rails 16a and 18a that slidably support the metal casings of the new lower sleeve and the old lower sleeve, respectively. An actuator 20 made of an oil cylinder is provided on the new sleeve holding portion 16 side.

  Here, as shown in FIG. 1 and FIG. 2, the base plate on the converter 1 side is provided with a pair of positioning guide horns 21 so that the center of the nozzle hole 2c is the center of the diagonal line, A pair of guide rods 22 is provided on the substrate 19 of the sleeve exchange device 15 at a position corresponding to the guide horn 21.

  Hereinafter, the replacement operation of the lower sleeve by the sleeve replacement device 15 will be described.

  6A and 6B are diagrams showing a lower sleeve replacement operation procedure by the sleeve replacement device 15, wherein FIG. 6A is a plan view and FIG. 6B is a side view. FIG. 7 is a cross-sectional view of the main part when the lower sleeve is replaced.

  In exchanging the lower sleeve, the new lower sleeve 3 'is previously held in the new sleeve holding portion 16 of the sleeve exchanging device 15 by sliding it into the guide rail 16a (see FIG. 7). Next, as shown in FIG. 6, the sleeve changer 15 is held by the manipulator 24 on the moving carriage 23, and the sleeve changer 15 is moved closer to the converter 1 by moving the moving carriage 23 along the track rail 25. Let Then, the manipulator 24 is operated to adjust the position of the sleeve exchange device 15 in the vertical and horizontal directions, and the guide rod 22 of the sleeve exchange device 15 is inserted into the guide horn 21 provided on the converter 1 side to replace the sleeve. The device 15 is positioned.

  The subsequent procedure will be described with reference to FIG. 7. The actuator 20 of the sleeve changing device 15 is advanced (expanded), whereby the new lower sleeve 3 ′ held by the new sleeve holding portion 16 is moved to the current sleeve receiving portion 17. Extrude towards By this operation, the new lower sleeve 3 ′ rides on the rail 14a as shown in FIG. 5 and is crimped to the upper sleeve 2, and the old lower sleeve 3 ″ (see FIG. 7) that has been crimped to the upper sleeve is It is pushed out by the sleeve holding portion 18 and is slid and held on the guide rail 18a. This completes the replacement of the lower sleeve.

  When the discharge port structure of the present example was applied to an actual converter and the replacement work was performed with a sleeve replacement device, the replacement work could be completed within 5 minutes.

  The present invention can be applied not only to a steelmaking converter but also to various molten metal container outlets.

It is a disassembled perspective view which shows one Example of the discharge port structure and sleeve exchange apparatus of this invention. It is a perspective view which shows the upper part side of the discharge port structure of FIG. It is a figure which shows a lower sleeve, (a) is a top view, (b) is AA sectional drawing of (a), (c) is BB sectional drawing of (a). It is sectional drawing of the principal part which shows an upper sleeve. It is sectional drawing of the principal part which shows the state which crimped | bonded the lower sleeve to the upper sleeve. It is a figure which shows the replacement work point of the lower sleeve by a sleeve exchange apparatus, (a) is a top view, (b) is a side view. It is sectional drawing of the principal part at the time of lower sleeve replacement | exchange.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Converter 2 Upper sleeve 2a Joint surface 2b Parallel surface 2c Nozzle hole 3 Lower sleeve 3 'New lower sleeve 3''Old lower sleeve 3a Joint surface 3b Parallel surface 3c Nozzle hole 4 Metal housing 4a Outer metal frame 4b Inner metal frame 5 Elastic body 6 Guide protrusion 7 Guide pin 8 Cooling horn (outside air inlet)
DESCRIPTION OF SYMBOLS 9 Sleeve fixing part 9a Sleeve pressing metal 10 Metal housing 10a Outer metal frame 10b Inner metal frame 11 Base plate 12 Pin 13 Sleeve fixing part 14 Holding part 14a Rail 14b Inclined surface 15 Sleeve exchange device 16 New sleeve holding part 16a Guide rail 17 Current sleeve accommodating portion 18 Old sleeve holding portion 18a Guide rail 19 Substrate 20 Actuator 21 Guide horn 22 Guide rod 23 Moving carriage 24 Manipulator 25 Track rail 26 Liner

Claims (7)

The sleeve-like refractory that forms the discharge port of the molten metal container is divided into an upper sleeve and a lower sleeve, and the upper sleeve is attached to the refractory lining the molten metal container, and the lower sleeve is detachable from the tip of the upper sleeve In the provided molten metal container outlet structure,
The lower sleeve is engaged with an elastic body for pressure-bonding the lower sleeve to the upper sleeve, and is held by a metal casing formed as a unit integral with the elastic body. Outlet structure.   The discharge port structure for a molten metal container according to claim 1, wherein the metal housing has an outside air introduction port for introducing outside air into the elastic body.   The lower sleeve is pressed against the upper sleeve by the reaction force when the elastic body is compressed by supporting the metal housing with the rail of the holding part fixed to the molten metal container, and moves along the longitudinal direction of the rail. The discharge port structure for a molten metal container according to claim 1, wherein the structure is detachable from the upper sleeve.   The molten metal container discharge port structure according to claim 3, wherein the rail has inclined surfaces for relaxing compression of an elastic body at a front end and a rear end in a longitudinal direction thereof.   The joint surface of the upper sleeve and the lower sleeve has a substantially circular shape, and the nozzle hole of the upper sleeve and the lower sleeve is provided at the center of the joint surface, and the outer shape of the joint surface is the movement direction when the lower sleeve is attached and detached. The discharge port structure for a molten metal container according to claim 3 or 4, wherein the discharge port structure has a parallel surface longer than the nozzle hole in an orthogonal direction. A molten metal container discharge port sleeve exchange device for replacing the lower sleeve in the molten metal container discharge structure according to any one of claims 3 to 5,
A new sleeve holding portion for holding a new lower sleeve, an existing sleeve holding portion for holding the lower sleeve supported by the rail and being crimped to the upper sleeve, and an old sleeve holding portion for holding the old lower sleeve after replacement With a actuator that pushes out the new lower sleeve held in the new sleeve holding part toward the current sleeve accommodating part,
The actuator pushes the new lower sleeve into the current sleeve receiving portion, so that the new lower sleeve is supported by the rail and is crimped to the upper sleeve, and the old lower sleeve that has been crimped to the upper sleeve is pushed to the old sleeve holding portion. A sleeve exchange device for the molten metal container outlet held in place.   A guide rod that can be held and moved by the manipulator and can be inserted into the guide horn provided on the molten metal container side, and when the lower sleeve is replaced, the guide rod is inserted into the guide horn by operating the manipulator. The sleeve replacement device for a molten metal container outlet according to claim 6, wherein the sleeve is positioned.

Images