JPS6311156Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a molten alloy ferro-adding device, specifically applied to adding ferroalloy into a ladle for receiving steel in the converter steel manufacturing process immediately before or during tapping. This invention relates to a device for adding molten alloy iron.

The converter steel manufacturing method is a steel manufacturing method in which the molten gun discharged from a blast furnace is put into a converter and refined. The main raw materials, molten gun, scrap iron, and auxiliary raw materials, such as slag forming agents and solvents, are directly charged into the converter, but in addition to these, additives such as ferroalloys and deoxidizing agents that determine the physical properties of steel are also added. is added in a solid state to the steel being tapped after blowing, depending on the use of the steel. However, the method of adding ferroalloy is difficult and poses various problems in operating the converter. First, the tapped steel from the converter is received in the ladle by tilting the converter and moving the ladle to follow the movement of the tapping port. Therefore, when adding ferroalloy during tapping, the amount of ferroalloy must be controlled and efficiently added in accordance with changes in the flow of tapped steel from the converter and the level of molten steel in the ladle. Normally, a distribution chute is provided to allow smooth addition as the ladle moves. The above-mentioned related operations are extremely complex and require a high degree of experience and skill.

Further, the added solid ferroalloy melts with the molten steel in the ladle, but at that time the temperature of the molten steel drops, so the steel tapping temperature must be increased accordingly.

There is a positive correlation between the tapping temperature and the life of the converter refractories, and from this point of view it is better to lower the tapping temperature as much as possible.

In order to solve the above-mentioned problems, the present invention adds ferroalloy to the ladle in a molten state, and allows the ferroalloy to be mixed with the ferroalloy through a simple automatic operation without lowering the tapping temperature. An object of the present invention is to provide a device for adding molten alloy iron that can mix molten alloy iron.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing the overall arrangement of converter operating equipment when implementing the present invention. In this embodiment, molten alloy iron is transported across a yard from an ingot yard to a converter yard.

First, to explain the outline of the present invention, a large-capacity holding furnace 9 for ferroalloy is installed at an appropriate location in an ingot making yard. The holding furnace 9 is equipped with a known tilting device and a weighing device for controlling the amount of ferroalloy cut out from the holding furnace. Note that the weighing machine may be mounted on a trolley, which will be described later. Between the ingot yard and the converter yard, there are processing devices 4, corresponding to each converter 1, 2, 3.
5 and 6 are installed. A movable small pot 7 that accommodates molten alloy ferro is prepared for each processing device, and the required amount of molten alloy ferro from the holding furnace 9 is divided into the small pots and placed near the converter. The small ladle is transported to a ladle position and molten alloy iron is injected directly into the ladle from the small ladle.

The structure of the small pot of the present invention and its tilting device is explained in the fifth section.
This will be explained with reference to FIG. The small pot main body 13 is held by the hanger 14 via a trunnion shaft 20 so that it can be rotated around the horizontal axis. As shown in FIG. 5, the hanging tool 14 is provided with a handling handle 15 at the center of its upper part, and a pair of swing arm handles 16 on both sides thereof.

28 is a ring stiffener that supports the small pot. The small pot of Figure 5 is equipped with a tilting device. That is, a motor 17 is fixed to the hanging tool, and the worm 18 and the worm gear 19 are driven by this motor.
The trunnion shaft 20 is rotated through the trunnion shaft 20, thereby causing the small pot body 13 to rotate. In this case, since the entire weight is applied to the hanging tool 14, the hanging tool 14 remains upright even if the main body 13 is tilted. In the embodiment shown in FIG. 6, the tilting device for the small pot is a chain 31 attached to the bottom of the small pot body 13.
The other end is connected to an electric hoist 30 held on the rotation arm 11, and by operating this electric hoist, the small pot body 13 is tilted around the trunnion shaft 20 via the chain 31. It's becoming like that. When the motor 17 (FIG. 5) or the electric hoist 30 is deenergized, the small pot body 13 returns to its original position under its own weight.

With reference to FIGS. 2 to 4, a device for passing the small ladle 7 from the ingot making yard onto a ladle waiting to be tapped in a converter yard will be described. The winding device 4 as a whole is composed of a winding arm 11 for suspending the small pot 7 and a drive mechanism 12 for the winding arm 11. The rotation arm 11 has two hooks 1 at the tip as shown in FIG.
1a and 11b, and as shown in FIG. 4, a short shaft 21 is fixed to the base 11c and is rotatably supported. The drive mechanism 12 includes a driven gear 23 fixed to a short shaft 21 at the base of the rotation arm 11.
, a drive gear 24 that meshes with the gear 23, a cylinder device 27, and a drive arm 26 that connects the shaft 25 of the drive gear 24 and the cylinder device 27. The gears 24 and 23 are rotated through the swivel arm to rotate the swing arm about an axis 21 at its base.

In such a configuration, the molten alloy iron is divided into appropriate amounts from the holding furnace 9 to the small ladle 7 in response to a tapping command. After cutting out this ferroalloy, the handling handle 15 of the small pot 7 is lifted with a special crane.
Transport the spinning device 4 to the standby position, and attach the hanging arm 16 for the spinning arm of the small pot to the hook 1 of the spinning arm 11.
1a and 11b and hang it from the tip of the arm. The rotation arm 11 that hangs the small pot 7 is the drive mechanism 1
2, it is rolled around the base 11c up to the top of the ladle 10 that is waiting to be tapped. Thereafter, just before or during the tapping of steel from the converter 1, the tilting device of the small ladle is operated to add the molten alloy iron in the small ladle into the ladle. After the addition is completed, the rotation arm 11 is rotated to the original standby position, the empty small pot is lifted by the special crane, and returned to the holding furnace 9. In addition, the small pot can be hung on the rotation arm, rotated, and added (tilted).
A series of return and rotation operations are automatically performed.

The length of the steering arm is determined by the position at which the small pot is passed onto the steering arm and the position at which it is added onto the ladle.In order to make this arm length as short as possible, the steering arm and its drive mechanism are The spinning device itself may be mounted on a traveling cart and run to a position very close to the ladle.

According to the present invention, since ferroalloy in a molten state is added instead of solid addition as in the past, the temperature at which the steel is tapped from the converter can be lowered, the life of the refractories in the converter can be extended, and the blowing O ₂ The amount can be reduced.

As an example, when adding ferroalloy by melting and adding 6.5 kg/t, the tapping temperature can be lowered by about 10°C compared to solid addition. Furthermore, there is no need to control addition during tapping, and the operation for addition is easy and can be automated.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the overall layout of the converter operating equipment when implementing the present invention, Figure 2 is the converter,
A schematic front view showing the mutual positional relationship of the ladle and the rolling device, FIG. 3 is a plan view thereof, and FIG.
The figure is a side view showing the turning arm of the turning device and its drive mechanism, FIG. 5 is a perspective view of a molten alloy iron storage container (small pot) according to the present invention equipped with a tilting device, and FIG. 6 is a side view showing the turning arm of the turning device and its drive mechanism. It is a schematic side view which showed another Example of the small pot tilting device based on FIG. 1... Converter, 4... Processing device, 7... Small pot, 9
... Holding furnace for ferroalloy, 10 ... Ladle, 11 ... Rotating arm, 12 ... Drive mechanism, 14 ... Hanging tool, 1
7... Motor, 18... Worm, 19... Worm gear, 23... Driven gear, 24... Drive gear, 27... Cylinder device, 30... Electric hoist, 31... Chain.

Claims (1)

[Scope of utility model registration request] a container for storing molten alloy iron; a rotating device for supporting the container and rotating it to a position above a ladle waiting for tapping; A tilting device for adding molten alloy iron into the ladle.