US2135658A - Ladle - Google Patents

Description

938. R. s. A. DOUGHERTY 2,135,558

LADLE Filed Feb. 26, 1938 2 -.SheetsSheet l Nov. 8, 1938. R. s. A. DOUGHER'TY' 2,135,658

LADLE Filed Feb. 26, 1952 2 Sheets-Sheet 2 Patented Nov. 8, 1938 UNITED STATES L'ADLE Robert S. A. Daugherty, Bethlehem,Pa., assignor to Bethlehem Steel Company, a corporation of Pennsylvania Application February 26, 1938,'-Serial No. 192,696

a Claims.

My invention relates to slag pots used for conveying molten slag from a furnace to a slag dump, and particularly to an improved construction of such pots. I

" Slag pots in general are made in the shape of an inverted thimble, with outwardly flaring sides and a rounded bottom. Such pots are generally equipped with a plurality of seats intermediate the top and bottom of the pot by which they may be mounted on a yoke provided with trunnions which provide a pivot on which the slag pot may be tipped while resting on suitable supports on a slag car.

In service, the high temperatures to which slag pots are subjected cause stresses in the walls of the pots and eventually cause the walls to crack and thereafter to deteriorate rapidly.

In addition, these high temperatures cause the walls of the pot to expand, particularly in the region immediately below the supporting'yoke. As long as such expansion is not excessive, no harm occurs, but in practice the walls of the pot are frequently strained beyond their elastic limit and acquire a permanent bulge or set. When slag is handled and dumped from such a pot in a molten condition no harm results from the pressure of a bulge in the side walls. However, slag is frequently kept in the pots for a period of several hours and inrsuch case the body of slag in immediate contact with the walls of the pot cools and forms a layer of solidified slag known as a skull. If a skull is formed in a pot, the sides of which .are bulged as above described, the constriction of the pot above the bulge prevents the 5 removal of the skull by merely tipping the pot, and it is necessary to break up the skull with sledges or orowbars before it can be removed from the pot.

The object of my invention is to provide a slag pot so constructed that cracking, which causes the pot to deteriorate rapidly, and bulging, which makes the skull difiicult to remove, are eliminated.

Other objects of my invention will be apparent from the drawings and from the following description.

In the drawings:

Figure 1 is a top plan view of a slag pot constructed in accordance with my invention;

Fig. 2 is a View partly in vertical elevation and partly in vertical section along the line 2--2 of the slag pot shown in Fig. 1;

Figs. 3 and 4 are views in horizontal section of the slag pot taken along the lines 3--3 and 4-4 of Fig. 2, respectively; and

Fig. 5 is a fragmentary View in vertical section of a slag pot along the line 5-5 of Fig. 1 showing a seat which rests upon the yoke.

In the drawings, which show a slag pot of thimble shape, I shows the outwardly flaring side wall of generally circular contour, and 2 shows the bottom of the pot which is preferably rounded or spheroidal in shape.

In order to accommodate a yoke (not shown) whereby the pot may be mounted on a slag car, the wall I is provided with a plurality of seats 3 which 10 rest'u'pon the yoke, and projections 4 which accommodate means for securing the pot to the yoke I The pot is also provided with eyes 5 whereby the pot may be transferred by means of a crane to 15 and from the slag car.

The wall I contains a plurality of inwardly extending corrugations 6 disposed vertically around the circumference of the pot. These corrugations begin at a point I somewhat above the bottom of 20 the slag pot and terminate at a point 8 somewhat below the top of the pot. These corrugations preferably increase in depth from their points of beginning I and 8 to a maximum at point 9 intermediate the ends, but my invention is not in- 25 tended to be limited by this feature, since the spirit of my invention will be met by the use of corrugations of equal depth throughout their lengths.

In addition to the inwardly extending cor- 30 rugations 6, above described, the top of the pot is provided with a plurality of outwardly extending vertical corrugations I0 disposed between the inwardly extending corrugations 6 and having a maximum depth at point I I on the rim of the 5 pot and terminating at point I2 intermediate the top and the bottom of the pot.

As heretofore stated, slag pots of ordinary design frequently crack in service because of the expansion of the walls of the pot resulting from the 40 intense heat of the molten slag contained in the pot. Moreover, such pots tend to become bellied immediately below the supporting yoke on which the pot is mounted in the slag car, with the results hereinabove described. It will be seen 45 that with my arrangement of corrugation there is provided the greatest number of corrugations at the portion of the pot subject to the highest temperatures.

With a slag pot constructed in accordance with 50 my invention, however, these results do not follow. The inwardly extending corrugations 6 and the outwardly extending corrugations I0 act as stiffening members which reinforce the wall I and tend to prevent the bellying of the wall. 55

Moreover, in my preferred construction the corrugations 6 have their maximum depth and consequently their maximum strength at the point where the maximum deformation of the pot usually occurs.

In addition, the corrugations 6 and I permit the metal of the pot to expand freely under the influence of theheat of the molten slag and to contractfreely when such heat is'removed. with the result that cracking of the walls" due to stresses set up by such expansion and contraction is prevented or greatly lessened. Since a pot constructed in accordance with-- my invention will not belly, no difiiculty is found in removing the skull ofrcogled" slag which v flaring sidef wallsm ontaining a plurality of in-' formed if the slag is allowedto" remain in the pot for a considerable time. I

. It will be seen moreover that the, inwardly ieXr-Il tending ribs 6 facilitate the removal of any skull, which may be formed on the interior of the pot since by reason; of their increasing depth from their poin'tof inception! to their point of maximum depth v9 they form bearings upon which the skull .is supported-as, it slides from the pot, and lessen. the friction which results from the contact between the skull and the interior wall of thepot. v l U Having thus describedhmy invention, What I claim and, desire to secure by Letters Patent is:

1. A ladlecomprising a shellhaving outwardly fiaringside" walls, said side walls containing a plurality of inward y .extending corrugations having their'greatest depth intermediate the ends; thereof, and a, plurality of j outwardly extending corrugations at the upper end thereof.

2. A ladle comprising an outwardly ivfla ring substantially circular shell, said shell containing containing a plurality of inwardly extending corr'ugati'ons intermediate the top and the bottom thereof varying in depth from their ends to points Hintermediatetheir ends, and a plurality of outwardly extending corrugations at the top thereof increasing in depth from their lower to their upper ends. g 4. Aladle comprising a shell having outwardly Wardly disposedcorrugations extending upwardly to a point below the rim of the shell and a plurality ofjoutwardly disposed corrugations extending-upwardly from a point below the rim of the shell to said rim.

5. A ladle havingasubstantially vertical wall providedwith a; first series of corrugation extending up the wall from near the bottom of the wall and terminating short of the top of the wall, and a second series of corrugation extendingdown-the wall from near the top of the wall and wallfromnear'the bottomof the wall and terminating short of the top of the wall, and a second corrugation.; extenc ling down the wall from near the top-thereof to; a pointbeyond the pointof termination of the first mentioned corrugation.

ROBERTS. A. DOUGHERTY.

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