JP4665345B2 - Stirring desulfurizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an agitation desulfurization apparatus mainly used for desulfurization of hot metal, and more particularly, to a hot metal desulfurization apparatus in which stirring is performed by an impeller, and a proposal for a structure for attaching a pusher for fixing a stirrer, that is, supporting it in an immobile state.
[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]
Examples of the agitation desulfurization technique include Japanese Patent Publication No. 42-12343, Japanese Patent Publication No. 55-30563, Japanese Patent Publication No. 61-166908, Japanese Patent Publication No. 4-99212, and Japanese Patent Publication No. 10-169418. And the like. All of these techniques are configured such that an impeller of a stirring device supported in an aerial manner on a molten metal holding container such as a hot metal ladle is lowered toward the molten metal in the holding container.
However, since the agitator having such a configuration is often supported by a crane or the like, there is a problem that the operation may not be possible due to vibration accompanying the rotation of the impeller.
[0004]
In order to solve these problems, the following apparatuses have been proposed conventionally. FIG. 1 is a schematic diagram of a stirring type desulfurization apparatus for desulfurizing a hot metal 11 put in a hot metal ladle 10 as one of such conventional techniques. As shown in the figure, this desulfurization apparatus mainly comprises a stirrer 1 that moves up and down via a crane, and a guide frame 2 that is constructed of a plurality of standing H-shaped steels and the like for guiding the lifting and lowering of the stirrer 1. It is. The stirrer 1 includes an impeller 3 and a rotary drive machine such as a motor 4 and a speed reducer 5 mounted on a carriage 6. The stirrer 1 is suspended by a crane via a wire (not shown), retreated upward along the guide frame 2 provided in the desulfurization treatment plant, or lowered toward the hot metal ladle 10. Or
[0005]
Further, in this desulfurization apparatus, a pusher 7 using a hydraulic cylinder or the like for firmly fixing the stirrer 1 supported in the aerial space to the guide frame 2 and suppressing vibration and vibration accompanying rotation of the impeller 3 Are attached to the agitator itself. That is, while the impeller 3 is rotating, the rod of the pusher 7 is strongly pressed toward the guide frame 2 to fix it in an immobile state.
[0006]
[Problems to be solved by the invention]
For this reason, the conventional desulfurization apparatus has to move the hydraulic apparatus and hydraulic piping for operating the pusher in accordance with the raising and lowering of the agitator, which causes the degree of freedom of the apparatus to be lost, and maintenance / There was a problem that made inspection difficult.
In other words, since the conventional desulfurization apparatus is equipped with a pusher on the side of the agitator that moves up and down, a reel that feeds and winds up the hydraulic piping in accordance with the elevation is required, and the pusher is placed on the movable side (stirrer). Since it was installed, the stability was poor, and maintenance was not possible unless the equipment was shut down, which was an obstacle to improving productivity. In addition, in the case of this conventional apparatus, there is a problem that trouble such as oil leakage is likely to occur because the hydraulic pipe (hose) disposed on the pressing tool is moved together with the stirrer from the hydraulic apparatus.
[0007]
An object of the present invention is to provide an agitation-type desulfurization apparatus that does not require ancillary equipment such as a moving pipe and has excellent maintainability and stability during operation.
[0008]
[Means for Solving the Problems]
As a result of intensive investigations on the above-mentioned problems that the prior art has, the inventors have fixed the pusher as a means for supporting the stirrer in a stationary state when the stirrer is aerial supported on the hot metal pan. When it was attached to the guide frame on the side, it was found that the above problem could be solved, and the present invention was completed.
[0009]
That is, the present invention relates to an agitation desulfurization provided with an agitator equipped with an impeller and its drive, a guide frame that guides the raising and lowering of the agitator, and a plurality of pushers for fixing the agitator to the guide frame. In the apparatus, the pushing tool is attached to a guide frame.
[0010]
In the present invention, the pusher is preferably a pressurizer such as a hydraulic cylinder, an air cylinder, or an electric cylinder.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 2 shows an example of a stirring desulfurization apparatus according to the present invention. In addition, the same code | symbol as FIG. 1 among the codes | symbols shown means that it is the same structure as the conventional desulfurization apparatus.
The agitation desulfurization apparatus according to the present invention is divided into a movable side equipment and a stationary side equipment, and the former is equipped with a rotary drive machine including a motor 4 and a speed reducer 5 on a carriage 6. The latter is constituted by a guide frame 2. In the guide frame 2, a pusher 12, preferably a pressurizer such as a hydraulic cylinder, an air cylinder, or an electric cylinder, is installed toward the carriage 6 of the stirrer 1. That is, the role of the pusher 12 is to press a rod (not shown) against the carriage 6 to suppress shaking and vibration when the stirrer 1 is driven and to ensure a stable desulfurization process.
[0012]
Hereinafter, the details of the configuration of the desulfurization apparatus according to the present invention will be further clarified in accordance with the description of the desulfurization treatment method.
First, in the desulfurization process, the hot metal ladle 10 containing the hot metal to be treated is carried directly under the agitator 1 of the desulfurization apparatus. At this time, the stirrer 1 is supported in a state of being retracted upward along the guide frame 2 via a crane or the like. Next, at the start of the desulfurization process, the stirrer 1 is lowered so that the impeller 3 attached to the lower part is immersed in the hot metal 11 of the hot metal ladle 10, and the impeller 3 reaches a predetermined immersion depth. The descent stops when After that, the stirrer 1 in a state of being aerial supported along the guide frame 2 is firmly fixed to the position at the stop position by the expanding and contracting rods of the plurality of pushers 12 installed in the guide frame 2. Supported. At this time, the impeller 3 may be rotated in advance or may be rotated after being immersed. Thereafter, a desulfurizing agent is introduced into the hot metal ladle 10, and the desulfurization treatment is performed by appropriately adjusting the rotation speed of the impeller 3.
When the desulfurization reaction is completed, the rotation of the impeller 3 is stopped, and almost simultaneously with the stoppage, the pusher 12 is loosened to release the fixing of the stirrer 1 and the stirrer 1 is lifted upward to complete a series of desulfurization processes. .
[0013]
The desulfurization apparatus of the present invention configured as described above has a feature that a hydraulic apparatus, hydraulic piping, and the like for operating the pusher can be installed outside the desulfurization apparatus. That is, the pusher and the hydraulic device are connected by hydraulic piping. However, in the device of the present invention, it is not necessary to move the hydraulic piping or the like together by raising and lowering the stirrer as in the prior art. Although it is possible to eliminate the movement of the piping by mounting the hydraulic device main body on the stirrer, it is not preferable from the viewpoint of easy maintenance and the risk of oil leakage.
[0014]
As described above, in the desulfurization apparatus of the present invention, since the pusher for fixing the stirrer is installed on the stationary guide frame side, the stirrer and the pusher can be maintained separately. In addition, since the frequency of maintenance and inspection can be increased, the operating rate of the equipment can be improved. In addition, since it is no longer necessary to stop the equipment for maintenance and inspection, an improvement in productivity can be expected. Furthermore, since it is not necessary to dispose the hydraulic piping on the stirrer side, it is not necessary to feed out the piping, and troubles such as oil leakage can be avoided, thereby improving maintainability.
[0015]
【The invention's effect】
According to the present invention, it is possible to provide an agitation-type desulfurization apparatus that does not require ancillary equipment such as a moving pipe (hose), has no trouble such as oil leakage, and has excellent maintainability and stability during operation. This also has the effect of improving productivity.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a conventional agitation desulfurization apparatus.
FIG. 2 is a schematic diagram of a stirring desulfurization apparatus according to the present invention.
[Explanation of symbols]
1 Stirrer 2 Guide frame 3 Impeller 4 Drive 5 Decelerator 6 Carriage
7 Conventional pusher 8, 13 Hydraulic device 9, 14 Hydraulic piping 10 Hot metal pan 11 Hot metal (molten metal)
12 Present invention pushing tool

Claims (2)

In a stirring desulfurization apparatus comprising: an agitator including an impeller and a driving device thereof; a guide frame that guides the raising and lowering of the agitator; and a plurality of pressing tools for fixing the agitator to the guide frame. Stirring type desulfurization device characterized by being installed in a guide frame 2. The stirring desulfurization apparatus according to claim 1, wherein a pressurizer such as a hydraulic cylinder, an air cylinder, or an electric cylinder is used as the pusher.

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