JPS5922106Y2 - Lance hole cone for converter swing lance - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a lance hole cone in a turning lance for a converter.

It is known that when the lance is used in a stationary state in a converter, the slag-making reaction tends to significantly stagnate in the middle stage of refining.For this reason, in recent years, attempts have been made to improve the slag-making ability by rotating the lance during blowing. A proposal was made to 1. Various devices for this purpose have been proposed, including Utility Model Application Laid-Open No. 53-46303.

As shown in FIG. 1, in these devices, a lance carriage 1 is provided with a rotating device 2, and a lance hole cone 4 that constitutes a swivel bearing is extrapolated to the lance 3, and this lance hole cone 4 is inserted into a converter 5. With the lance 3 fitted into the lance insertion hole 61 of the upper smoke exhaust hood 6 and held by the swivel device 2, the swivel device 2 is operated, and the lance 3 is fitted into the lance insertion hole 61 formed by the lance hole cone 4. It is said that the bearing is used as a fulcrum to rotate in a pestle-like manner.

In such a device, a pressure receiving ring that contacts the outer cylinder of the lance 3 and forms a fulcrum for turning is provided inside the lance hole 4. In order to enable rotation, it is necessary to provide a large gap between the main bodies of the lance hole cones above and below the pressure receiving ring and the main body of the lance 3. Therefore, the molten steel and exhaust gas in the converter are discharged from this gap. There is a drawback that a large amount leaks outside the hood 6.

The present invention was devised in view of the above-mentioned conventional difficulties, and aims to provide a lance hole cone that can appropriately prevent the leakage of molten steel and exhaust gas to the outside of the flue gas hood. be.

An embodiment of the present invention shown in the drawings will be explained below. In FIGS. 2 and 3, 3 is a lance main body;
31, 32, and 33 are an outer cylinder, a middle cylinder, and an inner cylinder constituting the lance 3, 4 is a lance hole cone body, and 7 is for locking the lance hole cone body 4 through its lower end midway in the longitudinal direction of the lance 3. The lance hole cone 4 is locked to this stopper 7 to prevent it from falling off the lance 3.

The lance hole cone main body 4 has an inverted truncated cone shape, has a lance insertion hole 41 in its center, and is inserted into a lance insertion hole provided in a smoke exhaust hood above the converter through the side surface of the lance hole cone body 4. Ru.

Reference numeral 8 denotes a pressure receiving ring disposed approximately in the vertically intermediate portion of the lance hole cone main body 4 so as to surround the lance 3, and the pressure receiving ring 8 has a protruding portion 81 on the inside of its ring shape. This protrusion 81 comes into contact with the outer cylinder 31 of the lance 3, thereby forming a pivot point for the rotation of the lance 3.

This pressure receiving ring 8 has a plurality of divided constituent parts attached to an annular step portion 4 formed inside the lance hole cone 4.
It is constructed by arranging it in a ring shape at 2, and its upper part is locked by a holding metal fitting 9.

In this embodiment, the pressure receiving ring 8 is made of a cast iron material that has a natural lubrication function, and can be partially replaced due to wear or the like.

In the above configuration, the upper plate part of the lance hole cone main body 4, that is, the inner peripheral edge of the upper plate part 43 that forms the lance insertion hole 42 and surrounds the lance 3 in a ring shape, and the lance outer cylinder 3.
A gap a is provided between the lance 3 and the pressure receiving ring 8 to allow the lance 3 to pivot around the pressure receiving ring 8.
An annular recess 44 that opens toward the lance is provided on the inner peripheral edge of the upper plate portion 43.

A rod-shaped ring body 10.1 is provided on the upper and lower inner walls between this annular recess.
0 are fixed so as to face each other.

A ring-shaped movable plate 11 is fitted into the annular recess 44 .

That is, the inner diameter of this ring-shaped movable plate 11 is the same as that of the lance 3.
Lance 3 is made slightly thicker than the outer diameter.
The ring body 10.1 can be loosely inserted into the ring body 10.1.
By being slidably inserted between the lance 3 and the lance hole cone 4, the gap between the lance 3 and the lance hole cone 4 is closed.

This movable plate 11 is configured to slide within the annular recess 44 following the pestle-like rotation of the lance 3 with the pressure receiving ring 8 as a fulcrum.

In addition, in the map, 12 and 13 are introduction holes for sealing fluid (for example, nitrogen gas).

According to the above configuration, molten steel and exhaust gas that blow up during refining work are confined in the smoke exhaust hood by the movable plate 11, and the movable plate 11 slides within the annular recess 44 without inhibiting the rotation of the lance 3. do.

In this embodiment, the movable plate 11 is configured to slide between the ring bodies 10.10, but such a ring body 10.10 is not provided and the movable plate 11 is directly applied to the wall surface of the annular recess 44. It is also possible to do so.

According to the present invention as described above, an annular recess 44 opened toward the lance is provided on the inner peripheral edge of the upper plate portion 43 surrounding the lance 3 in a ring shape above the pressure receiving ring 8.
Since the ring-shaped movable plate 11 into which the lance 3 is loosely inserted is slidably inserted, the advantage is that the spouting and leakage of molten steel and exhaust gas to the outside of the smoke hood during refining can be minimized. There is.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing a conventional swing lance device. FIG. 2 is a side view showing the lance hole cone of the present invention and its attached state, and FIG. 3 is a partially enlarged cross-sectional view showing the portion where the movable plate is attached in FIG. In the figure, 3 is a lance, 4 is a lance hole cone, and 8
11 indicates a pressure receiving ring, 11 indicates a movable plate, 43 indicates an upper plate portion, and 44 indicates a kneaded recess.

Claims (1)

[Scope of utility model registration request] It has a pressure receiving ring inside that contacts the lance outer cylinder and serves as a fulcrum for the lance's pestle-like rotation, and is removably fitted into the lance insertion hole of the smoke exhaust hood above the converter with the lance inserted. In the lance hole cone constituting the swivel bearing, an annular recess opening toward the lance is provided on the inner peripheral edge of the upper plate portion that surrounds the lance in a ring shape above the pressure receiving ring, and the lance is loosely inserted into the annular recess. A lance hole cone for a swing lance for a converter, characterized in that a ring-shaped movable plate is slidably inserted into the lance.