JP4078834B2 - Impeller for desulfurization device, its replacement device and impeller replacement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to an impeller replacement technique for a stirring-type desulfurizer mainly used for hot metal desulfurization, and in particular, an impeller for a desulfurization apparatus suitable for easily and quickly replacing old and new impellers, and an impeller replacement thereof. It is a proposal about the method.
[0002]
[Prior art]
It is well known that sulfur (S) in steel adversely affects the surface properties and center segregation of continuous cast slabs as well as the mechanical properties of products. On the other hand, in recent years, with increasing demand for quality, the demand for low-sulfur steel and ultra-low-sulfur steel has increased, and improvement of desulfurization technology has been demanded. The desulfurization treatment is generally performed on hot metal having a high S activity in terms of reaction efficiency, and various methods have already been industrialized. Among them, an injection desulfurization method in which a desulfurizing agent is blown through a lance immersed in hot metal, a mechanical stirring desulfurization method in which an impeller (rotary blade) is immersed in hot metal, and the hot metal and the desulfurizing agent are mixed and stirred are widely used.
[0003]
The stirring-type desulfurization apparatus performs a desulfurization treatment by immersing an impeller attached to a lower end portion of a drive shaft of a stirrer via a flange joint or the like in a molten metal in a holding container, rotating and reacting with a desulfurizing agent. Device. In this type of apparatus, the portion of the impeller that is immersed in the hot metal usually has a surface covered with a refractory and is used repeatedly. However, if the number of times of use increases, the impeller of this apparatus may be melted or missing, and hot metal or noro will adhere. For this reason, the impeller must be replaced regularly.
[0004]
Desulfurization cannot be performed while the impeller is being replaced. Therefore, the impeller replacement work needs to be completed in a short time. For this reason, for example, an impeller exchanging device as shown in Japanese Utility Model Publication No. 57-44158 and Japanese Utility Model Application Publication No. 5-37949 has been developed.
Of these, the impeller replacement device disclosed in Japanese Utility Model Publication No. 5-37949 is supported on a self-propelled carriage 1 that travels on a desulfurization treatment line so as to be movable up and down by a cylinder device 2 as shown in FIG. A plurality of impeller containers 3 are installed, and a rotation shaft 5 (impeller shaft) of the impeller 4 and a rotation main shaft 6 (drive shaft) of the stirrer are attached and detached by a flange joint 7. This apparatus is characterized in that the replacement work can be performed easily and quickly by attaching a centering device 8 comprising a movable turntable to the impeller container 3.
[0005]
That is, in order to replace the old and new impellers with this impeller exchanging device, after receiving the old impeller in the liftable impeller vessel 3 mounted on the carriage 1, the flange joint 7 is removed and the impeller vessel 3 is removed by the cylinder device 2. The impeller shaft 5 and the drive shaft 6 of the stirrer are separated. Next, the carriage 1 is moved and the impeller container 3 on which the new impeller is mounted is conveyed directly below the drive shaft 6 of the stirrer, the container is raised by the cylinder device 2, the flange joint 7 is connected, and the replacement is performed. Complete.
[0006]
[Problems to be solved by the invention]
However, the conventional impeller exchanging device is configured to perform the exchanging operation by placing the impeller lower end surface on the inner bottom surface of the impeller container when exchanging. For this reason, the impeller container needs to be larger than the diameter of the impeller, and the size of the apparatus is necessarily large.
In addition, when the impeller manufacturing dimensional accuracy is poor, or when hot metal or glue adheres to the lower end surface of the impeller, the impeller placed on the impeller container is inclined obliquely, making it difficult to join the flange joint. That is, when replacing the impeller in such a state, an unnecessary force is applied to the bolt and the rod, and it takes a long time to remove the impeller. In particular, when installing, even if a centering device is used, the flange surface on the impeller side is not horizontal, so it does not fit well with the flange surface on the rotating main shaft side of the agitator, and replacement work cannot be performed smoothly. It was.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide an impeller, its replacement device, and its replacement method that do not require a large impeller container, can be downsized, can be easily replaced, and can greatly reduce the replacement time. It is to provide.
[0008]
[Means for Solving the Problems]
The present invention replaces the conventional technique of replacing the impeller by placing the impeller in the impeller container, and an overhang portion in which the impeller is formed in the vicinity of the upper end portion of the impeller shaft, and a support for the impeller replacement device unique to the present invention. It is made to exchange under the state of an aerial support via.
[0009]
That is, the present invention includes an impeller shaft having a drive shaft connected for joint to the upper end, in the desulfurization apparatus for an impeller comprising mounting a stirring blade at its lower end, below the joint of the impeller shaft, the desulfurization apparatus when replacing the impeller An impeller for a desulfurization device, characterized in that an overhanging portion capable of supporting the impeller by engaging with a support tool of the impeller replacement device is provided.
[0010]
The present invention is also an impeller replacement device for a desulfurization device for exchanging an impeller according to the above-described gist configuration, and is a travelable impeller replacement carriage, a vertically movable lifting column that is erected on the impeller replacement carriage, An impeller for a desulfurization apparatus comprising: a support arm of an impeller fixed to an upper portion of the lifting column; and a support member attached to the support arm and engaged with a projecting portion provided on the impeller to support the impeller. Is an exchange device.
[0011]
Furthermore, the present invention, the impeller supra, upon exchange with a switching device of an impeller for the above desulfurizer, leads to the impeller changing carriage directly under the impeller, then lifting the replacement device and overhanging portion of the impeller the possible support, the impeller is supported by the overhead, a method of replacing the desulfurizer impeller being characterized in that to perform the exchange of the impeller under the imaginary support.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 shows an example of a preferred embodiment of the present invention, in which the impeller according to the present invention is fastened by a drive shaft of a stirrer and a bolt and nut via a flange joint, and the impeller replacement according to the present invention. The apparatus is schematically shown.
[0013]
The impeller 9 of the present invention comprises a stirring blade 4 and an impeller shaft 5 which are impeller bodies made of a refractory, and a flange joint 7 for connecting the impeller to a drive shaft 6 of the stirrer at the upper end of the impeller shaft 5. Is provided. The impeller shaft 5 is provided with an overhanging portion 10 below the flange joint 7 for holding the impeller and supporting it in an aerial manner. The overhanging portion 10 is provided so that the impeller can be supported in an aerial manner by the support 13 that is engaged with and supported by a support 13 attached to a lifting column of an impeller exchanging device described later. .
The flange joint provided at the upper end of the impeller shaft 5 may be a connection means using another fastening method having the same type of function.
[0014]
The overhanging portion 10 can be used as long as it has a shape capable of supporting the impeller aerial, such as a flange shape, a wing shape, a cross shape, or a protrusion shape. In particular, in the case of a flange, it is effective in preventing contamination of the joint due to splash scattering from the hot metal during the desulfurization process, and it can prevent the temperature of the joint from rising due to radiant heat from the hot metal. It is necessary and preferable because the replacement work becomes easier.
[0015]
As described above, the position where the projecting portion is provided is under the joint at the upper end of the impeller shaft. The distance from the joint to the overhanging portion is not particularly limited, but it is necessary that the distance between the joint and the overhanging portion is moderately spaced so as not to hinder the work of attaching and detaching the impeller and the drive shaft of the stirrer.
Next, an impeller exchanging apparatus according to the present invention includes an impeller exchanging carriage 1 that can travel on a desulfurization treatment line, an elevating support column 11 that is erected on the impeller exchanging carriage 1 and can be moved up and down by a cylinder device or the like, An impeller support arm 12 attached to the upper part of the support 11 and a support tool 13 attached to the free end of the support arm. The impeller is supported in an aerial manner by holding and lifting the overhanging portion 10 of the impeller by the support 13 that moves up and down in accordance with the movement of the lifting column.
Here, FIG. 2 shows a state where the exchanging carriage 1 is in a standby state and the exchanging device according to the present invention does not hold the impeller yet, that is, the state where the support 13 and the overhanging portion 10 are not engaged. As shown, the height (level) of the support 13 is slightly below the lower surface of the overhanging portion 10 of the impeller.
[0016]
In order to hold the impeller via the projecting portion 10 by the support tool 13 attached to the support arm that moves up and down, for example, a bifurcated support tool is inserted into the lower portion of the projecting portion, and this is sandwiched from below. A method of holding it in an imaginary manner by lifting it up, a method of gripping and engaging the rod-like projecting portion with a ring-shaped support tool, and the like are possible.
As is apparent from the above description, the impeller container is completely unnecessary in the apparatus according to the present invention. In addition, if the center of the support and the center of the stirrer drive shaft are aligned in advance, a centering device is not necessary, and the device can be miniaturized.
[0017]
The impeller exchanging method using the impeller and the impeller exchanging device according to the present invention is a method of exchanging old and new impellers while holding the overhanging portion of the impeller and supporting it in an aerial manner by the support of the impeller exchanging device. Is what you do.
The details of the impeller replacement work will be described below.
In order to remove the impeller, first, the replacement carriage in the state as shown in FIG. 2 is guided to the desulfurization processing equipment and guided so that the support 13 attached to the support arm 12 that moves up and down enters the lower part of the overhanging portion 10. Next, the impeller elevating column 11 is operated, and the support 13 is engaged with the overhanging portion 10. FIG. 3 illustrates this state. Next, the bolts and nuts of the flange joint 7 are removed, and the joint between the stirrer and the impeller is released. At this time, since the impeller is supported in an aerial manner and horizontally by the support tool 13, the removal work is easy. Thereafter, the impeller lifting / lowering column 11 is lowered to the initial position, and the replacement carriage 1 is moved backward to complete the removal of the impeller.
[0018]
Next, when mounting the new impeller, first, the impeller shaft 5 and the stirrer drive shaft 6 match the replacement carriage 1 in which the new impeller is held by the support 13 and the level of the support 13 is set to the initial setting position. Stop moving to the desired position. FIG. 4 shows the state at this time. At this position, the impeller lifting column 11 is raised, and the flange 7 at the upper end of the impeller shaft 5 is joined to the flange 7 ′ of the stirrer drive shaft 6. Then, a joint part is fastened with a bolt nut. Thereafter, after the lifting column 11 is lowered to the initial position, the exchange cart 1 is moved backward to complete the mounting operation.
[0019]
In such a method of the present invention, the impeller is always held horizontally even if there is a deposit on its lower end. Therefore, if the center of the support tool and the center of the impeller rotation main shaft are aligned in advance, the impeller can be easily held and removed by the support tool when the impeller is removed. Furthermore, when the new impeller is installed, the centering work is not necessary, and the work efficiency is improved.
[0020]
In the above description, the case where one support tool is mounted on the support arm has been described. However, a plurality of support tools can be mounted on the support arm. For example, FIG. 5 shows an exchange device that can mount two impellers. In this example, it is possible to collect the old impeller 9 ′ with one support and to use the new impeller 9 for attachment on the other hand, so that the work time required for replacement can be greatly reduced.
[0021]
【The invention's effect】
As described above, according to the present invention, an impeller is provided in the vicinity of the upper end of the shaft, and an overhanging portion used for aerial support is provided, and an impeller exchanging device can be moved up and down to be engaged with the overhanging portion. By providing a simple support and supporting the impeller through the overhanging portion, the impeller container and the centering device are completely unnecessary, and the impeller replacement device can be downsized. Moreover, according to the present invention, the impeller can be easily centered, and the replacement time can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a conventional impeller exchange device.
FIG. 2 is a schematic diagram of an impeller of the present invention and an impeller exchange device.
FIG. 3 is a schematic view showing a state where the support device holds the impeller before the impeller is removed, according to the embodiment of the present invention.
FIG. 4 is a schematic view showing a state in which the support device holds the impeller before the impeller is mounted, according to another embodiment of the present invention.
FIG. 5 is a schematic view showing an example in which two impellers are mounted on an exchange device according to still another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Impeller exchange cart 2 Cylinder apparatus 3 Impeller container 4 Conventional impeller 5 Impeller shaft 6 Stirrer drive shaft 7 Flange joint 8 Centering device 9 Impeller 10 Overhang part 11 Lifting support column 12 Impeller support arm 13 Impeller support tool 14 Work deck 15 Stirrer 16 motor

Claims (3)

An impeller shaft having a joint for connecting a drive shaft at the upper end, and an impeller for a desulfurization device in which a stirring blade is attached to the lower end of the impeller shaft, the impeller shaft for the desulfurization device is replaced under the impeller shaft joint when the impeller is replaced. An impeller for a desulfurization apparatus, wherein an overhanging portion capable of supporting an impeller by engaging with a support is provided . An impeller replacement device for a desulfurization apparatus for replacing an impeller according to claim 1, wherein the impeller replacement carriage is capable of traveling, an elevating elevating support column erected on the impeller exchanging carriage, and an upper part of the elevating support column. a support arm of the anchored impeller, its attached to the support arm, switching apparatus of the desulfurization apparatus for an impeller, characterized in that engages the overhanging portion provided on impeller consisting support for supporting the impeller. When the impeller according to claim 1 is replaced using the desulfurization apparatus impeller replacement apparatus according to claim 2, the impeller replacement carriage is guided directly under the impeller, and then the impeller overhanging portion and the replacement apparatus the liftable support, the impeller is supported by a fictitious, replacing the desulfurizer impeller being characterized in that to perform the exchange of the impeller under the imaginary support.

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