JPH029083B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a molten steel stirring device, and more specifically, a ladle unloading station, a heating device, and a degassing device are arranged in a circular closed loop in the circumferential direction. This invention relates to a molten steel stirring device for ladle refining equipment arranged at intervals of .

(Prior Art) Molten steel taken out from various converter furnaces is stored in a ladle, and if necessary, various types of out-of-furnace refining are performed before casting. There are various types of refining equipment, but recently, powder additives for refining (for example,
CaC ₂ , Ca−Si, etc.) with a carrier gas (usually
Refining equipment (commonly referred to as KAT equipment other than calcium injection equipment) is used to control inclusions, desulfurize, deoxidize, etc. by injecting with Ar).

Furthermore, a heating device for retaining or heating the molten steel, a degassing device for removing dissolved gas from the molten steel, etc. are also used. Conventionally, these devices have been installed independently, and alloying components have been added to each device independently as necessary. dehydrogenation is considered to be particularly important, and their relationship is attracting attention.

That is, the above-mentioned KAT device, heating device, degassing device, etc. are each installed as independent equipment,
Moreover, the reality is that they are located in remote locations. Therefore, a special crane is required to transport the ladle to these devices, and a crane or a ladle-carrying cart is also required between each device.

Furthermore, depending on the type of steel and its intended use, these processing steps may differ, with some requiring only passing through a heating device and a degassing device, others simply passing through a heating device and a KAT device and omitting the degassing device, and others. Various processes are used, such as directly transporting the gas into the KAT device without passing it through a heating device, and then transporting it into a degassing device. Therefore, the ladle conveyance line that connects these needs to be configured to accommodate these. In addition, since these devices are installed separately, it is necessary to install an independent alloy powder charging device and/or exhaust gas device for each, which increases equipment costs and is also inconvenient in terms of operation management and operation. There are many. On the other hand, in recent years, the continuous casting method has been widely adopted in place of the ordinary ingot making method from the viewpoint of productivity, yield improvement, energy saving, labor saving, etc. In order to achieve this, it is necessary to continuously prepare and supply molten steel of the desired quality to the continuous casting process.

However, on the converter side, which is in a position to supply this, the blowing time and quality of molten steel vary considerably depending on the charge, and the subsequent processing steps are also affected by this and vary depending on the steel type. With the conventional equipment configuration, it is often difficult to continuously and efficiently supply molten steel of the quality required in the continuous casting process. Therefore, the current situation is that the advantages of the continuous casting method are not fully utilized.

Focusing on this point of view, the present applicant previously proposed a molten steel processing device in Japanese Patent Application Laid-Open No. 55-164020, and the proposed technology allows the processing process to be carried out continuously. Improve productivity.

The time required for each processing device can be shortened, eliminating the need for a traveling crane, reducing processing time and increasing production.

Since each processing device is disposed close to each other, it is easy to centrally manage operations.

Ancillary equipment can be centrally installed and shared, reducing equipment costs.

It requires less floor space and can be installed on a limited site.

Processing can be freely combined according to the target quality.

I was able to enjoy benefits such as:

(Problems to be Solved by the Invention) However, the previously proposed technology does not disclose the specific configuration of how the molten steel contained in the ladle is stirred in the heating device and the degassing device. There isn't.

The ASEA-SKF method is generally known as a ladle refining technology that uses an electromagnetic stirring device (hereinafter referred to as a stirrer) for the purpose of stirring molten steel in a ladle (3rd Edition Iron and Steel Handbook, Volume 679 of Iron and Steel Manufacturing) ~686 pages Published by Maruzen Co., Ltd.).

By the way, in the above-mentioned ladle refining technology, the stirrer is fixed to the ladle truck or the ladle loading platform, and the heating device and degassing device are arranged in a so-called linear arrangement, so there are two processes for heating and degassing. If one of the two devices is in process, the other is in an unprocessed state and is not in use.

Usually, the stirrer is fixed to a ladle car, and in order to increase the equipment operating rate, it is not possible to move the ladle cart etc. in a closed loop as in the proposed technology mentioned above.
The method of powering the stirrer is very difficult, which is why closed-loop stirrers have not been used in the past.

In order to facilitate power supply wiring to the stirrers in an annular arrangement with high productivity and low equipment costs, the present invention separates the stirrers from the ladle truck or ladle loading platform and devises the installation position of the stirrers for molten steel. The purpose is to provide a stirring device.

(Means for solving the problem) The technical means taken by the present invention to achieve the above-mentioned object is that the ladle unloading station, the heating device for heating the molten steel in the ladle, and the degassing device are circular-shaped. a dolly or a ladle loading stand that is arranged at intervals in the circumferential direction on a closed loop, and that moves the molten steel storage ladle carried into the ladle unloading station to the heating device and the degassing device on the closed loop; Further, a stirrer for stirring the molten steel in the ladle through the side of the ladle is provided on the fixed deck side in the radial inward direction of the closed loop corresponding to each of the heating device and the degassing device, and the stirrer stirs the molten steel in the ladle through the side of the ladle. Each of them is capable of moving forward and backward in the radial direction relative to the side of the pot.

(Function) The molten steel storage ladle 2 carried into the ladle unloading station 1 is transported to the Arc heating device 3 and the vacuum degassing device 4 via the cart 9 or the ladle loading platform 10, respectively.

When the ladle 2 is matched with the heating device 3, the stirrer 23 is advanced and moved radially outward,
It corresponds to the side surface of the ladle 2 via a gap.

Therefore, by supplying power to the stirrer 23, molten steel is stirred during Arc heating.

When the specified stirring is completed, the stirrer 2
3 moves backward in the radial direction to enable pan travel.

When the ladle 2 is connected to the degasser 4, the stirrer 24 is moved forward and radially outward, and is connected to the side surface of the ladle 2 through a gap.

Therefore, by supplying power to the stirrer 24, stirring of the molten steel is carried out during the vacuum degassing process.

Then, when the specified stirring is completed, the stirrer 2
4 moves backward in the radial direction to enable pan travel.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 2, a ladle unloading station 1, an arc heating device 3 for heating molten steel in a ladle 2, and a vacuum degassing device 4 are arranged at intervals in the circumferential direction on a circular closed loop 5. There is.

In this embodiment, a slag dumping area 6 is provided on the closed loop 5 between the pot unloading area 1 and the heating device 3.
and on the closed loop 5 between the vacuum degasser 4
A KAT device 7 is provided.

Note that the slag removal field 6 and the KAT device 7 may be arranged separately from the closed loop 5.

Referring also to FIG. 1 et seq., the ladle 2 containing the molten steel 8 carried into the ladle unloading station 1 is transferred to the heating device 2, the degassing device 4, and the slag via the trolley 9 or the ladle loading platform 10. The field 6 and the KAT device 7 are movable on the closed loop 5.

In the first embodiment shown in FIG.
Two pot loading tables 10 are each supported in the form of an arm so as to be rotatable around a vertical axis, and each pan loading table 10 can freely run and move on the closed loop 5 via a drive motor 12, rack and pinion transmission means 13, etc. It is said that

In the second embodiment shown in FIG. 5, a wheel 14 is provided on the lower surface of the radially outwardly extending end of the pan loading platform 10, and while the wheel 14 is supported by an annular rail 15, it is operated via a motor 12, a rack and pinion transmission means 13, etc. It is said that it can be moved freely.

In the third embodiment shown in FIG. 6, the base end of the pot loading platform 10 is pivoted vertically via a horizontal shaft 18 onto an annular body 17 with wheels 16 rotatably fitted onto a fixed support 11. By driving wheels 14 supported by an annular rail 15 by a motor 12 with a reduction gear, etc., it is possible to freely run and move on the closed loop 5.

In the fourth embodiment shown in FIG. 7, the pot loading platform 10 has its base end pivoted to an annular body 17 via a horizontal shaft 18, and a rack and pinion transmission means 13 etc. are driven by a drive motor 12 provided at a radially outward position. It is possible to freely run and move on the closed loop 5 through the closed loop 5.

In the fifth embodiment shown in FIG. 8, the trolley 9 is separated from the fixed support 11 and placed on an annular rail 15,
The motor 12, rack and pinion transmission means 13, etc. allow it to travel freely on the closed loop 5.

That is, as is clear from the first to fifth embodiments described above, the ladle 2 containing molten steel via one or more carts 9 or the ladle loading table 10 is placed on the closed loop 5 on the horizontal plane at the ladle unloading station 1, The heating device 3, the degassing device 4, the slag dumping station 6, and the KAT device 7 are movable.

The fixed abutment 11 has a support 1 on the center of the closed loop 5.
9 is erected, and fixed decks of an upper deck 20, a middle deck 21, and a lower deck 22 are provided on the support column 19 in a radially extending manner. As shown, stirrs 23 and 24 are provided corresponding to the heating device 2 and the degassing device 4, respectively.

The stirrer 23 is for stirring molten steel during Arc heating, and the stirrer 24 is for stirring molten steel during vacuum degassing treatment.
2, so that it can freely move forward and backward in the radial direction.

That is, the stirrers 23 and 24 are connected to the rails 25 and 2 laid on the lower deck 22, respectively.
Wheels 29 and 30 of stirrer moving tables 27 and 28 are rotatably supported on the stirrer moving tables 27 and 28, respectively, and stirrers 23 and 24 are attached to the stirrer moving tables 27 and 28 via pins 31 and 32, respectively. ing.

Telescopic cylinders 33, 3 are provided between the stirrer moving tables 27, 28 and the lower deck 22, respectively.
By connecting the stirrers 23 and 24, the stirrers 23 and 24 can be moved forward and backward through the movement of the stirrer movable tables 27 and 28 in and out of the radial direction.

That is, by advancing the stirrers 23 and 24, they approach the side surfaces of the corresponding ladle 2, and the front surfaces of the stirrers 23 and 24 are 20 to 50 mm away from the outer surface of the ladle.
The molten steel is stirred through the sides of the ladle in this state.

Furthermore, the stirrers 23 and 24 are moved backward to allow the pot to run on the closed loop 5.

As shown in FIGS. 4 1 and 2, stopper cylinder mechanisms 35 and 36 that operate vertically are attached to the rear surfaces of the stirrer moving tables 27 and 28, and stopper pins 35A and 36A of these mechanisms 35 and 36 are installed.
are respectively engaged and disengaged from receiving holes 37 and 38 that are bored inside and outside in the radial direction on the lower deck 22, thereby making it possible to position the stirrers 23 and 24 when moving forward and when moving backward. ing.

That is, the stopper pins 35A and 36A are connected to the receiving hole 3.
When the stopper pins 35A and 36A are engaged with the receiving holes 38, forward positioning is performed, and when the stopper pins 35A and 36A are engaged with the receiving holes 38, backward positioning is performed.

Furthermore, the power supply wiring 39, 40 for each of the stirrers 23, 24 is connected to the flexible portion 39.
Stirrer moving table 2 via A and 40A respectively
7 and 28, and are detachably connected to the stirrers 23 and 24 via connecting portions 39B and 40B, respectively.

The flexible parts 39A and 40A are connected to the stirrer 23 via the stirrer moving table mentioned above.
24 radial inward and outward strokes (within 1000 mm) are permitted.

Note that the power supply wiring 39, 40 may be of the type without cable carrier as shown in Fig. 1, or may be of the cable carrier type as shown in Fig. 3, and in the figure, the power is supplied from the upper deck side. It is also possible to follow the power supply format from the foundation side.

Additionally, reference numeral 41 denotes a pot tilting table, which is pivotably supported on the cart 9 or the pot loading table 10 via a horizontal shaft 42, and a tilting cylinder shown in FIG. An engaged portion 44 is provided with which the end of 43 is engaged.

Further, the ladle tilting table 41 is formed with recesses 46 on both sides of the ladle 2, into which the trunnion brackets 45 are fitted and removed, and the ladle 2 containing molten steel is moved through the ladle tilting table 41 in this embodiment. Trolley 9 or pot loading platform 1
It is supported by 0.

Therefore, when the ladle 2 is moved to the slag dumping area 6, the tilting cylinder 43 attached to the lower deck 22 is extended, engaged with the engaged portion 44, and pushed up. By tilting the tilting table 41 via the horizontal shaft 42, the ladle 2 can be held in an inclined position, and the slag removal work can be performed in this state.

Additionally, in FIG. 1, reference numeral 47 indicates a heat-insulating lid, 48 an electrode, 49 a temperature sampling meter, and 50 a lance.

(Effects of the Invention) In the present invention, a ladle unloading station, a heating device for heating molten steel in a ladle, and a degassing device are arranged on an annular closed loop at intervals in the circumferential direction,
Since a trolley or a ladle loading platform is provided to move the molten steel storage ladle carried into the ladle loading area to the heating device and the degassing device on the closed loop, the truck or the pan loading platform is arranged in a circular shape. By moving in a closed loop, processing steps can be performed continuously, improving productivity.

The space in front of each processing device can be shortened, eliminating the need for a traveling crane, reducing processing time and increasing production.

Since each processing device is disposed close to each other, it is easy to centrally manage operations.

Ancillary equipment can be centrally installed and also shared, reducing equipment costs.

It requires less floor space and can be installed on a limited site.

Processing can be freely combined according to the target quality.

This basic function and effect can be achieved.

Further, in the present invention, a stirrer for stirring the molten steel in the ladle through the side of the ladle is provided on the fixed deck side in the radial inward direction of the closed loop corresponding to each of the heating device and the degassing device, and each of the stirrers Since it is possible to freely move forward and backward in the radial direction with respect to the side surface of the pot, the following special effects are achieved in addition to the above-mentioned basic effects.

This eliminates the problem of stirring molten steel, allowing continuous processing and greatly increasing productivity.

Power supply to the stirrer can be simplified.

By placing the stirrer on the side of the fixed deck, maintenance becomes easier, and since you only have to approach the pot when necessary, failures due to heat load on the stirrer are reduced.

Since the stirrer is provided on the fixed deck side on the radially inner side of the closed loop, power consumption in power supply to the stirrer can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an elevational sectional view showing an example of how the heating device and degassing device of the equipment are connected, and FIG. 2 shows an example of ladle refining equipment arranged in an annular shape. 3 is a side view showing the stirrer power supply section, FIGS. 4 1 and 2 are sectional views showing a part of the stirrer positioning mechanism in an operating state, and FIGS. 5 to 8 are a ladle traveling trolley. Or it is a side view which shows four Examples of a pot loading stand. 1... Pot unloading station, 2... Ladle, 3... Heating device, 4... Degassing device, 5... Closed loop, 9...
Cart, 10... Pot loading platform, 23, 24... Stirrer, 27, 28... Stirrer moving platform.

Claims (1)

[Claims] 1 A ladle unloading station, a heating device for heating molten steel in a ladle, and a degassing device are arranged at intervals in the circumferential direction on a circular closed loop, and the ladle unloading station A trolley or a ladle loading platform for moving the molten steel storage ladle to the heating device and the degassing device on the closed loop is provided, and further, fixing in the radial inward direction of the closed loop corresponding to each of the heating device and the degassing device is provided. A ladle characterized in that a stirrer is provided on the deck side to stir the molten steel in the ladle through the side surface of the ladle, and each of the stirrers is movable radially inward and backward relative to the side surface of the ladle. Molten steel stirring device for refining equipment.