US3730506A

US3730506A - Mixer ladle structure

Info

Publication number: US3730506A
Application number: US00210000A
Authority: US
Inventors: R Mcafee
Original assignee: Steel Corp
Current assignee: United States Steel Corp
Priority date: 1971-12-20
Filing date: 1971-12-20
Publication date: 1973-05-01
Anticipated expiration: 1990-05-01

Abstract

Improved structure includes a substantially rectangular spout box made of refractory lined plates having extended side plates at each end extending longitudinally of the ladle body from opposite sides of the spout box, and gusset plates connected with and extending between the side plates transversely of the ladle body on opposite sides of the spout box.

Description

United States Patent 1 [111 3,730,500 McAfee 1 May 1, 1973 I MIXER LADLE STRUCTURE [56] References Cited [75] Inventor: Richard .I. McAfee, Forest Hills UNITED STATES PATENTS Borough, 2,341,054 2 1944 McFeaters ..266/39 [73] Assignee: United States Steel Corporation,

Pittsburgh Przmary Examiner-Gerald A. Dost Atz0rney-D0nald S. Ferito [22] Filed: Dec. 20, 1971 21 Appl. No.: 210,000 [57] ABSTRACT Improved structure includes a substantially rectangular spout box made of refractory lined plates having [52] US. Cl ..266/39, 105/264 extended side plates at each end extending longitw [51] Int. Cl ..F27d 15/00 dinany f the l d body f Opposite sides of the Field Of Search ..266/l3, 36 H, 39; pout box and gusset plates connected with and extending between the side plates transversely of the ladle body on opposite sides of the spout box.

1 Claim, 1 Drawing Figure MIXER LADLE STRUCTURE The present invention relates generally to molten metal handling equipment and more particularly to an improved structure for a molten metal mixer ladle of the submarine or Pugh type.

The Pugh type ladle is shown and described on page 446 of the Ninth Edition of The Making, Shaping and Treating of Steel" published by U. S. Steel Corporation.

The structural behavior of submarine type ladle bodies existing prior to my invention can be described as follows: Deflection analyses indicated that the cast spout box of the ladle, which was substantially oval in shape, was extremely flexible, due to its curvature, as compared with straight shell plate. The spouts tended to fold and shift stresses to the body shell immediately below. As this shift occurred, compressive forces traveled diagonally downward and outward, through the body shell, to meet under the spout. This created the effect of transverse force components which tended to spread the body shell in area under the spout. These forces causes bending stresses which far exceeded the body shell strength. Since this was so, it had to be concluded that the brick lining assisted the body shell in resisting spreading. Accordingly, it had to be further concluded that when the brick lining wore thin, spreading and sagging occurred.

It is, accordingly, the primary object of my invention to provide an improved mixer ladle structure to eliminate the abovementioned spreading action and substantially reduce stresses in the spout box area of the shell body of the ladle.

It is a more specialized object of my invention to provide an improved mixer ladle structure as set forth above which includes a substantially rectangular spout box made with refractory lined plates having extended side plates at each end extending longitudinally of the ladle body from opposite sides of the spout box, and gusset plates connected with and extending between the side plates transversely of the ladle body on opposite sides of the spout box.

These and other objects will become more apparent after referring to the following specification and drawing in which:

The single FIGURE of the drawing is a perspective view of a submarine type mixer ladle having the improved structure of the invention.

Referring more particularly to the drawing, reference numeral 2 designates generally the body of a submarine type molten metal mixer ladle having a charging and discharging port 4 intermediate its ends. A spout box 6, which is substantially rectangular in shape and made of steel plates lined with refractory R, is mounted on said body over and communicating with said opening with its long dimension extending transversely of the body 2. Steel plates 8 are attached to the end edges H) of the spout box 6 and extend longitudinally ofthe body 2. Each of the four side plates 8 is in the form of a right triangle disposed with one side parallel with one of the end edges 10 and its hypotenuse 12 extending downwardly and outwardly from the top of the spout box to a point 14 on the body 2 remote from the spout box. The plates 8 are rigidly affixed to the body 2 and the spout box by welding or similar means.

A gusset plate 16 18 connected with and extends between the hypotenuse edges of the plates 8 transversely of the body 2 on opposite sides of the spout box.

The upper edge 18 of each gusset plate 16 is rigidly affixed to the upper edge of the spout box. The bottom edge 20 of each of the gusset plates 16 is concave and conforms to the transverse contour of the body 2. The gusset plates 16 are rigidly affixed to the body 2.

The rectangular-shaped spout box 6 is far less flexible than the oval-shaped cast spout boxes heretofore used. The extended side plates 8 develop a bending strength through the spout box area equal to that of the full body shell. This permits compressive forces to pass through the body shell and spout at the same level, thus eliminating most of the spreading action and avoiding a stress increase around the spouts. The gusset plates 16 tie the spout box, side plates and body shell together and produce the effect of a pair of triangular beams spanning the top of the ladle. The beams thus formed pick up compressive forces approaching the spout and carry them to the side plates, thus practically eliminating the spreading action.

The following advantages arising from the improved structure will be obvious to those versed in the art:

1. The body shell will be self-supporting, minimizing stresses imposed on the lining, which should result in greater lining life.

2. There is less likelihood of the body shell being damaged when the lining is permitted to wear thin.

3. The body shell bending stresses will be reduced by more than percent resulting in greater reliability.

4. There is created a potential reduction in body shell thickness while maintaining the same factor of safety.

5. Castings in the spout box area may be eliminated.

While I have shown but one embodiment of my invention, other adaptations and modifications may be made without departing from the scope of the following claim.

I claim:

1. In a molten metal mixer ladle having a substantially ellipsoidal hollow body with a charging and discharging opening intermediate the ends thereof, the improvement therewith of a substantially rectangular spout box formed of steel plates disposed on and communicating with said opening, the ends of said spout box extending longitudinally of said body, plates attached to and extending from both end edges thereof lengthwise of said body, each of said side plates being in the shape of a right triangle disposed with one straight side parallel with one of said end edges and its hypotenuse extending downwardly and outwardly from the top of the spout box to a point on said body remote from said spout box, said triangular plates being affixed to said spout box and said body, and a gusset plate connected with and extending between the hypotenuse edges of said triangular plates transversely of said body on opposite sides of said spout box, the upper edge of each of said gusset plates being affixed to the upper edge of said spout box, the lower edge of each of said gusset plates being concave and conforming with and attached to the transverse contour of said body.