US2017384A - Apparatus for stripping ingot molds - Google Patents

Description

' Oct 15, 1935. D. P. ANDERSON 2,017,384

APPARATUS FOR STRIPPING INGOT MOLDS Filed Oct. 19, 1933 3 Sheets-Sheet 2 i 5537 Q M0 E52 E w 4 NINMMI, WW 2 w W 1 2 Patented a. 15, 1935 2,017,384

UNITED STATES PATENT OFFICE a David P. Anderson, Pittsburgh, Pa.

Application October 19, 1933, Serial No. 694,317

1 Claim. (01. 22-95) This invention relates to a novel method and practice to loosen the ingot in the mold at the apparatus for stripping ingot molds, and particuingot pp and to then ieaVe it in the mold larly to ingot molds of the big-end-up type, for transportation to the soaking pit, where it is although not limited thereto. withdrawn and charged into the furnace. The v 5 In the past, it has been customary in the vast conventional soaking pit cranes are provided 5 a majority of open-hearth steel plants to cast inwith tongs for lifting purposes only, and it is gots in heavy, vertical cast-iron molds having a therefore necessary to convey the molds and inslight taper, with the smallest area adjacent the gots to the stripper for feeling the ingot, p, and which is p at b ends- When and toforce loose what are known as stickers.

0 teeming Pouring the ingot, the molds are One object of the present invention is the proplaced onfiat Cast-iron plates Which vision of a novel apparatus for stripping ingots, a mou ted on sp y d p ingot meld together with a supplementary means for posi- Ca After a or ladle full of Steel is tively loosening seized ingots, regardless of how teemed into a row of molds and the molten t tl th t k t th m,

"metal has sufficiently solidified, a train of ingot Another object is t id novel means 15 mold cars, carrying the molds and ingots, is transfor t i i i t ld i a, Very rapid and ported to a ingot Stripper for removal of the efiicient manner, together with means for premold, after which the ingots are charged into a venting the dropping of t i t ld from the Soaking p reheating fumeeeapparatus during the operation.

The conventional ingot stripper is in the A th object is t provide a novel apparatus 20. form of an electric overhead traveling crane under of the class described which may be easily d which are two or more pairs of parallel tracks, manufactured and d i j ti on one of which the train of loaded ingot mold t conventional types of i t mechanism, Cars s ad p d to d- On an adjoining track thereby obviating the necessity of an expensive a train of empty ingot mold cars carrying stools and troub1esome installation, 25

only is placed. The stripping mechanism de- These and still further objects will be apparent pends from the overhead crane, and operates in after referring to the drawings, in which:

such manner as to seize the molds by lugs cast on Figure 1 is an elevation of the apparatus of the its side by means of a pair of links, lift them invention.

vertically off of the ingot and place them on the Figure 2 is an enlarged sectional elevation. 30 empty stools on the ingot mold cars on the ad- Figure 3 is a view similar to Figure 2 of the apjoining tracks. paratus in another stage of operation.

There have been several recent developments Figures 4 and 5 are sectional elevations of a in the form of ingots and molds which are calmodified form of the invention in two stages of culated to improve the soundness of the metal of operation. 35 the ingots. One of these developments contem- Referring more particularly to the drawings, plates the reversal of the taper in the mold, makthe letters A indicate a pair of tracks on which ing it What is now known as the big-end-up an overhead crane B is adapted to travel. A ty e, Another advance has be t provide conventional overhead crane trolley C is adapted fractory hot top to provide a sink-head or for movement on the Crane B and pp a 40 Shrinbhead on t of the ingot. vertically disposed screw D and reels E and F.

It is, of course, obvious to those skilled in the The Screw D may be V v rtically with reart that the acceptance of the superior big-endspect to thepverhead trolley C by means of up mold has necessitated-the provision of new motor Whlle the reels E and F y be rotated methods and apparatus for stripping and hanbyAmeatls zg H a g g i 1 E dling the ingots and molds. Due to the small palr ca J 1s secure 9 e ree while a similar pair of cables K 15 secured to reduced end of the ingot, 1t can no longer stand the reel R unsupporied for tlfansportatim} the soaking pit A carriage 2 is secured to the ends of the cables or reheating furnaceafter stripping, as was the J and K in order that it may be raised and 50 11511911 Practice. It is not feaslbi? 9 ered by rotating the reels E and F in unison. msgots or lay them down upon theu' sldesi as the An extended sleeve 3 is carried by the carriage metallurgical characteristics of the ingots would 2 and pivotally supports, as at 4, a pair of hoistbe badly affected. ing links 5. The hoisting links 5 are moved about Inview of the foregoing, it has become common the pivots 4 by means of the cables J and K 5 which are secured to the reels E and F of the overhead crane, and are provided with lugengaging surfaces 6 on their lower ends. The intermediate portions of the hoisting links 5 carry inwardly projecting lugs 7.

An inner sleeve 8 is disposed within the carriage 2 and extended sleeve 3, and supports a ram 9 on its lower end, the latter further supporting a downwardly extending yoke ID, A pair of dogs I2 are mounted on the upper portion of the yoke I I] and serve to engage the inwardly projecting lugs l of the links 5 in such manner as to preventtheir spreading when the yoke is raised to a predetermined position with respect to the carriage 2.

An elongated nut l3 is associated with the overhead crane and extends into the carriage 2 and extended, sleeve 3. A similar elongated nut I4 is connected to the inner sleeve 8 carrying the ram 9, and is reversely threaded with respect to the nut l3.

A double acting screw I5 is provided with a threaded portion l6 for the nut l3, and a similar threaded portion I! for the nut, and as before stated is rotated from the overhead crane trolley C as by means of the motor G.

A plurality of ingot mold stools 20 is disposed on the usual ingot mold cars, or buggies, 2|, and support ingot molds 22 of the big-end-up type. That is to say, the lower portion 22 of the ingot mold 22 is considerably smaller in area than the upper portion 22 The molds 22 are provided with a taperedapertur'e 23 in their bottoms and external lugs 24 to enable their handling. A tapered plug 25 is provided for the aperture 23 in each of the molds 22 and extends partially therethrough.

After molten metal has been teemed into the molds 22, the solidified ingots 26 are transported on the stools 20 and ingot mold cars 2| and, with their .hot-tops removed, to the ingot mold stripper of the invention, where it is desired to loosen the ingots from the molds prior to their removal and transfer to the usual soaking pit, or reheating furnace.

In accordance with the teaching of the present invention, the reels E and F of the overhead crane trolley are rotated in such manner as to lower the carriage 2 until the lug-engaging surfaces 6 of the hoisting links 5 are disposed under the upper of the lugs 24 on the ingot mold 22. The reels E and F are then adjusted with respect to each other and rotated in the opposite direction in such manner as to raise the ingot mold from its stool 20. A pin 21 which is mounted on the rod 28 in order that it may be handled from a remote distance is placed on the stool 20 in such manner as to permit it to extend into the aperture 23 when the mold is again lowered by the reels E and F of the overhead crane trolley C.

After the mold is lowered, the pin 21 engages the tapered plug 25 and causes the ingot mold 22 to move downwardly with respect thereto, thereby loosening the ingot.

Due to various imperfections in the mold and the steel ingot disposed therein, the operation is sometimes insuificient to loosen the ingot.

. .When the hoisting links 5 are engaging the lugs 24 of the ingot mold, the yoke In is in an upwardly retracted position such as will permit the dogs l2 to engage the inwardly projecting lugs l and prevent the links 5 from spreading with the consequent possibility of ,the release of the ingot mold.

The overhead crane trolley C raises the carriage 2 in such manner as to permit the ingot mold 22 to clear the upper portion of the basket 29, whereupon it is placed therein in such manner as to permit the pin 32 to extend into the aperture 23 and engage the bottom of the tapered plug 25. The screw I5 is rotated to permit the yoke NJ to descend and make contact with the top of the ingot mold. The cables K are lowered and cause the lug-engaging surfaces 6 of the hoisting links 5 to engage the lugs 3| of the basket. The yoke I!) further descends and serves to push the ingot mold 22 down into the basket while the links 5 are biased upwardly by raising the carriage 2 through the cables J. This action causes the ingot mold 22 to be pushed downwardly with respect to the ingot 26 regardless of how tightly it may have frozen therein.

It is to be understood that the overhead crane trolley C may be one of a number of conventional types, and forms no part of the present invention other than as means for operating the various elements of the ingot mold stripper, and while I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited thereto, since various modifications may be made without departing from the scope of my invention, as defined in the following claim.

I claim:

Apparatus for stripping an ingot mold having a plug in its bottom comprising a carriage supported by an overhead crane, a pair of hoisting links pivoted on said carriage, a pair of oppositely threaded elongated nuts slidably disposed in said carriage in vertical juxtaposition, a double acting screw in threaded engagement with said nuts, means associated with said overhead crane for rotating said screw, a ram connected to the lowermost of said elongated nuts, interlocking means on said ram and said hoisting links for restraining the latter from separation when said ram is in a predetermined position, and means for rotating said screw in such manner as to cause said ram to move downwardly when said links are.

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