JPH04354815A - Device for removing stuck metal to opening part in converter - Google Patents

Abstract

PURPOSE:To make the injection of oxygen intense onto a metal surface stuck to a furnace opening part and to quickly remove the metal by fitting a rotary table holding a lance having oxygen injection holes as rotatable and enabling stop at a desired position. CONSTITUTION:The removing device for the stuck metal to the opening part of a converter is formed with the lance 1 having the oxygen injection hole in side direction at the lower part and a lifting carriage 2 fitting the lance 1. In this carriage 2, the rotary table 4 holding the lance 1 is provided and is supported eccentrically rotatably with plural link mechanisms 5. Further, a self-aligning bearing 10 is fitted to lower part of the rotary table 4. Then the above lance 1 is swung by centering this bearing 10. Further, an angle setting device 11 is arranged to a rotation driving means 7 and the lance 1 in the swing-movement is stopped at the prescribed position.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for melting and removing bare metal adhering to the mouths of converters by oxygen injection.

0002

BACKGROUND OF THE INVENTION In converter steel manufacturing, molten steel is scattered during blowing due to spitting, etc., and this scattered material adheres to the mouth of the converter and solidifies. And this solidified material (base metal)
If it grows and its thickness exceeds a certain limit, it may interfere with the charging of hot metal or scrap, and sometimes it may flake off and fall, causing sudden disturbances in refining due to a drop in temperature. It may also damage the refractories of the furnace. Therefore,
When the thickness of the metal reaches a certain limit, the operation of the converter is temporarily stopped and the metal is removed.

[0003] Conventional techniques for removing furnace mouth metal include:
There is one disclosed in Japanese Unexamined Patent Publication No. 1-136923. In this technique, a special jig is attached to the lower part of the main blowing lance to use it as a metal removal lance.

FIGS. 5(a) and 5(b) show a state in which a jig is attached to the main lance for blowing to make it a lance for removing bare metal. FIG. 5(a) is a longitudinal sectional view, and FIG. b) is a bottom view. 30 is a main lance for blowing, and 51 is a jig. The jig 51 consists of a plurality of spacers 54 arranged radially between a disk 52 and an annular body 53, and is attached by hook bolts 55 inserted into the main blowing lance 30.

The white arrows indicate the flow direction of oxygen, and the oxygen supplied to the main blowing lance 30 flows radially from the oxygen injection hole surrounded by the disk 52, the annular body 53, and the spacer 54. is injected into.

[0006] FIG. 6 is a diagram showing a situation in which a metal removal lance having a jig attached to the main blowing lance is used to remove metal adhered to the openings of a converter according to the prior art. In this case, the metal removal lance 1 attached to a lifting cart (not shown) is inserted to a predetermined position in the center of the furnace mouth, and oxygen is injected to start melting the metal 22. Then, the lance 1 is pulled up in stages to sequentially melt and remove the metal in each predetermined range. 20 is a converter.

[0007]

[Problems to be Solved by the Invention] The adhesion of metal at the converter mouth does not necessarily occur uniformly around the mouth. FIGS. 4A, 4B, and 4C are diagrams illustrating the state of attachment of base metal at the furnace mouth, and are views showing the plane of the furnace mouth where the base metal has adhered. The metal 22 may adhere to the entire circumference of the furnace mouth as shown in Fig. 4(a), or it may adhere to the entire circumference of the furnace mouth as shown in Fig. 4(b) or 4(c).
), a large amount may adhere only to a certain part of the furnace mouth. And it is difficult to predict where it will adhere.

[0008] For this reason, when the metal removal lance 1 is inserted into the center of the furnace mouth and oxygen is injected as in the prior art described above, the oxygen injection conditions are all the same around the entire circumference of the furnace mouth. Therefore, in locations where a large amount of metal 22 is attached, the oxygen injection conditions are not strong enough to require a long time to remove the metal 22.

SUMMARY OF THE INVENTION An object of the present invention is to provide a metal removal device capable of removing metal adhered to the mouth of a converter in a short period of time.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention comprises a lance having an oxygen injection hole in the lateral direction at the lower part, and an elevating carriage equipped with an elevating mechanism and to which the lance is attached. is equipped with a rotary table that is eccentrically supported by a plurality of link mechanisms, rotatable by a rotary drive means, and on which a lance is placed;
Further, a self-aligning bearing is attached below the rotary table, and the lance is configured to be able to rotate around the self-aligning bearing, and an angle setting device is attached to the rotation drive means. The lance is configured to be able to stop at a desired position while the lance is rotating.

[0011]

[Operation] In the present invention, the lance can be rotated, and the lance can be stopped at a desired position during the rotation. Therefore, it is possible to bring the oxygen injection hole of the lance close to a location where a large amount of base metal is attached, and to inject powerful oxygen to the base metal surface, thereby easily removing only the base metal deposits.

0012

Embodiment FIG. 1 is an explanatory diagram showing an embodiment of the present invention. Reference numeral 1 denotes a lance for metal removal having an oxygen injection hole in the horizontal direction at the bottom (details will be described later); 2 an elevating cart on which the lance 1 is mounted and raised and lowered by a hoist (not shown); 3 a running cart (see Fig. (not shown) is a guide for the lifting truck 2. 13 is a sheave of the winding machine, and 14 is a wire. Further, 12 is a lance gripping device that grips and fixes the lance 1 when the lance 1 (elevating cart 2) is raised or lowered. 20 is a converter, 22 is attached metal,
21 indicates a smoke exhaust hood.

A rotary table 4 on which a lance 1 is placed is supported by a plurality of link mechanisms 5 on the lifting cart 2 . The elevating cart 2 and the rotary table 4 are provided with a recess cut out in the center on the right side in the figure, so that the lance 1 can be attached by moving laterally from the right side in the figure. The lance 1 is placed with the trunnion of the locking ring 6 attached to the lance 1 being received by a bearing on the rotary table 4.

The link mechanism 5 has a rotatable structure in which bearings are provided on the lifting carriage 2 and the rotary table 4, respectively. The plurality of link mechanisms 5 have rotating mechanisms connected to each other, and one
They are rotated at the same time by a motor 7, which is the primary rotation driving means. As the link mechanism 5 rotates, the turntable 4 rotates.

The link mechanism 5 includes a link 8 and a cylinder.
9, and by driving this cylinder 9, the link 8
is tilted, allowing the rotary table 4 on which the lance 1 is placed to be eccentric.

The smoke exhaust hood 21 below the rotary table 4 includes:
A fitting portion is provided in the insertion opening of the lance 1, and a self-aligning bearing 10 that is attached to a predetermined position of the lance 1 and has a spherical seat is fitted therein. The self-aligning bearing 10 can also be attached to the smoke exhaust hood 21 instead of being attached to the lance 1.

As described above, when the rotary table 4 on which the lance 1 is placed is eccentrically driven by the link mechanism 5, the lance 1 is moved to the self-aligning bearing 10 as shown by the two-dot chain line in the figure.
It will be tilted around the center. The inclination angle θ of the lance 1 can be set to an appropriate value by adjusting the driving distance of the cylinder 9 of the link mechanism. Then, when the motor 7 is started, the rotary table 4 rotates eccentrically, and the lance 1 starts turning (starts a so-called grinding motion).

Since the present invention does not simply rotate the lance 1, a pulse motor or the like is used as the motor 7 for rotationally driving the rotary table 4, and this motor 7 is equipped with an angle setting device 11. is attached. By setting the angle setting device 11, the lance 1 can be stopped at a desired position.

When the rotary table 4 is stopped while the lance 1 is rotated as described above (the rotary table 4 is eccentrically rotated), the lance 1 remains tilted at the desired angle θ and is moved to the desired position. Stops at. Therefore, the lance 1 is in a state in which the oxygen injection hole is close to the furnace wall at the furnace mouth where a large amount of metal 22 is attached.

Next, the metal removal lance used in the present invention will be explained. FIGS. 2(a) and 2(b) show an embodiment of the lower part of the metal removal lance used in the present invention, with (a) being a schematic longitudinal sectional view and (b) being a bottom view. In FIGS. 2A and 2B, the metal removal lance has a metal removal jig 31 removably attached to the lower part of the main lance 30 for blowing. The jig 31 includes a disc 32 having approximately the same diameter as the main blowing lance 30, and a plurality of parabolic rings fixed to the upper surface of the disc 32 and extending from the center to the circumference of the disc 32. The main part is constituted by a guide vane 33 and an annular body 34 fixed to the upper surface of the guide vane 33. As a result, the space surrounded by the disk 32, the guide vane 33, and the annular body 34 becomes an oxygen injection hole, and the structure is such that oxygen supplied from the main blowing lance 30 is injected laterally. In the figure, 35 is a mounting member on the jig 31 side;
6 is a mounting member on the side of the main blowing lance 30, 37 is a bolt and nut, and the white arrow indicates the flow direction of oxygen.

With this configuration, the oxygen ejected from the oxygen injection hole, which is the above-mentioned space, is injected obliquely and laterally, and the gas flow becomes a swirling flow.

FIGS. 3(a) and 3(b) show other embodiments of the lower part of the metal removing lance used in the present invention, and (a)
is a schematic longitudinal sectional view, (b) is a III-II in (a)
It is a view taken along the I arrow. In FIGS. 3(a) and 3(b), the lance for metal removal consists of an outer cylinder 40, a middle cylinder 41, and an inner cylinder 42, and has a water-cooled structure with a bottom. 44 is an oxygen flow path, 45 is a cooling water inlet flow path, and 46 is a cooling water outlet flow path. Further, in the lower part thereof, a large number of oxygen injection holes 43 are provided radially through the outer cylinder 40, the middle cylinder 41, and the inner cylinder 42.

[0023] The lance for removing bare metal used in the present invention is the one in which a jig is attached to the main lance for blowing as in the above-mentioned embodiment (Figs. 2(a) and (b)), The device is not limited to one exclusively used for gold removal (FIGS. 3(a) and 3(b)), and any structure that allows oxygen to be injected laterally may be used.

[0024] Next, the results of removing ingots adhering to the mouth of a converter with a refining processing capacity of 250 T/heat using the apparatus shown in FIGS. 1(a) and 1(b) will be described.

(Example) At this time, the state of adhesion of the base metal was concentrated in a specific location as shown in FIG. 4(c). After inserting the metal removal lance to a position where the oxygen injection hole was approximately 50 cm from the upper end of the furnace mouth, the lance was tilted by operating the link mechanism. After starting the rotational movement, the lance was stopped at the target position, and oxygen was injected to melt the metal. The degree of inclination of the lance at this time is such that the distance between the oxygen injection hole and the base metal surface is 5
It was set to about 0 cm.

[0026] Other conditions were as shown below. The lance used had the structure shown in Figures 2(a) and (b).Amount of metal deposited: Approximately 5TOxygen flow rate
Approximately 10,000Nm3/hour The above metal melting operation involves intensively injecting oxygen to the metal near the top of the furnace mouth (commonly called the Behren's foot), which is effective in removing the metal. The time required was approximately 10 minutes.

(Conventional example) Using the metal removal lance shown in FIGS. 5(a) and 5(b),
The adhered metal was removed by the method described in the above example.

At this time, the lance was inserted until its tip was approximately 2 m from the upper end of the furnace mouth, and oxygen was injected at a rate of approximately 10,000 Nm 3 /hour as in the example. Then, the lance was pulled up 40 cm, then 40 cm, and then another 40 cm to remove the metal. In this case, since the lance was located at the center of the furnace body, it took time to remove the bare metal, and it took about 30 minutes in total. The time required for this metal removal was approximately three times that of the example.

[0029]

[Effects of the Invention] As described above, the present invention is configured so that the lance can pivot around the self-aligning bearing, and the lance can be stopped at a desired position during the pivoting motion. .

[0030] Therefore, the oxygen injection hole of the lance can be brought close to a place where a large amount of metal has adhered, and powerful oxygen can be injected to the metal surface, making it possible to remove the metal adhered to the converter mouth. The time can be significantly reduced and the capacity of the steelmaking process will be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing an embodiment of the lower part of the metal removal lance used in the present invention, (a) is a schematic vertical cross-sectional view, (b)
is a bottom view.

FIG. 3 is a diagram showing another embodiment of the lower part of the metal removal lance used in the present invention, (a) is a schematic vertical cross-sectional view, (b)
) is a view taken along the arrow III-III in (a).

FIG. 4 is a plan view of the furnace mouth with metal attached, (a) is a diagram showing the state where metal is adhered to the entire circumference of the furnace mouth, (b) and (
c) is a diagram showing a state in which a large amount of metal has adhered to a part of the vicinity of the furnace mouth.

FIG. 5 is a diagram showing a conventional metal removal lance in which a jig is attached to the main lance for blowing, where (a) is a longitudinal sectional view and (b) is a bottom view.

FIG. 6 is a diagram showing a situation in which metal adhered to the mouths of a converter is removed according to the prior art.

[Explanation of symbols]

1 Lance for metal removal 2 Lifting truck 3 Lifting truck guide 4 Turntable 5 Link mechanism 6 Locking ring 7 Motor 8 Link 9 Cylinder 10 Self-aligning bearing 11 Angle setting device 12 Lance gripping device 13 Hoist Sheave 14 Wire 20 Converter 21 Smoke exhaust hood 22 Adhered metal 30 Main blowing lance 31 Metal removal jig 43 attached to the lower part of the blowing main lance 30 Oxygen injection hole

Claims (1)

[Claims] 1. A lance having oxygen injection holes in the lateral direction at the lower part thereof, and an elevating cart having an elevating mechanism and mounting the lance, the elevating cart being eccentrically supported by a plurality of link mechanisms and having rotational drive means. A rotary table is provided, which is rotatable by the rotor and on which the lance is placed.A self-aligning bearing is attached below the rotary table, and the lance is centered around the self-aligning bearing. A device for removing ingots deposited at the mouth of a converter, wherein the lance is configured to be capable of rotating movement, an angle setting device is attached to the rotation drive means, and the lance is configured to be able to stop the lance at a desired position during the rotational movement. .