US 3689369 A
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L. G. TUCKER CHARGING HOLE LID AND MAGNETIC LID LIFTER APPARATUS Filed April 5, 1971 2 Sheets-Sheet l INVENTOR. Lmwaaa 6T TUCKER 4 H me;
L. G. TUCKER Sept. 5, 1972 CHARGING HOLE LID AND MAGNETIC LID LIFTER APPARATUS Filed April 5, 1971 2 Sheets-Sheet 2 I INVENTOR. l/Nwaao 6T 7Z cK/? San/44 5M United States Patent O U.S. Cl. 202-251 6 Claims ABSTRACT OF THE DISCLOSURE A coal charging hole lid for a coke oven chamber has a plurality of radially arranged grooves in its top surface. A magnet for lifting and seating the lid has a plurality of resiliently biased pins around its periphery that coact with respective grooves in the lid and effect positive rotative action of the lid when it has been reseated in the charging hole.
BACKGROUND OF THE INVENTION The present invention relates to coke ovens and, more particularly, to a lid for a coal charging hole in a coke oven chamber and a lid handling mechanism for lifting and seating such lid.
One of the problems in regard to operating a lid lifting mechanism on a larry car is the reseating of the lid in the charging hole. It is necessary to provide apparatus that will effect positive oscillation of the lid after it has been reseated in order to minimize leakage of gases around the lid.
Usually charging hole lids do not, after some usage, have a planar top surface due to warpage because of heat. The top surface becomes slightly convex. In those installations where magnetic lid lifters are used, the slightly convex surface contour of the lid does not appreciably affect the magnetic attraction between the lid and the magnet, but it does affect and greatly reduce the torque that the magnet exerts on the lid during the seating-in oscillation. One reason why the torque is reduced is that the effective area of contact between the magnet and the convex surface of the lid is reduced. Even though the attraction force of the magnet is constant, the requisite amount of torque to accomplish effective seating-in oscillation of the lid is not available because of the small surface area in contact with the magnet.
Several attempts have been made, knowledge of which is available from the prior art, to effect positive torque on a warped charging hole lid. One such attempt includes the application of a circular, high-speed-steel cutting band saw blade to the lower surface of the magnet. It was reasoned that the sharp teeth of the saw blade should dig into the lid and provide a positive torque for seating-in. However, such a saw blade soon becomes dull and, after a short service life, the blade is no longer effective. The teeth break or are quickly worn down and have no effect on the lid.
Other apparatus known from the prior art also have not proved to be entirely satisfactory, with the result that charging hole lids are usually improperly seated and leakage of gases by the lids is not an uncommon occurrence.
SUMMARY OF THE INVENTION A charging hole lid has a plurality of radially arranged grooves in its surface which coact respectively with a plurality of resiliently biased pins in a lid lifting electromagnet; wherefore, the pins provide torque for oscillating a lid even though it may be convexly warped.
For a further understanding of the invention and for features and advantages thereof reference may be made to the following description and the drawings which illusice trate a preferred embodiment of equipment in accordance with the invention.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:
FIG. 1 is a plan view of a charging hole lid in accordance with the invention;
FIG. 2 is a view along line IIII of FIG. 1;
FIG. 3 is a view along lines IIIIII of FIG. 1;
FIG. 4 is a plan view of a lifting magnet in accordance with the invention; and
FIG. 5 is a view along line V-V of FIG. 4.
DETAILED DESCRIPTION FIG. 1 illustrates in plan view a coal charging hole lid 11 which comprises a circular plate that has a slightly chamfered periphery as at 13, and that has a plurality of radial grooves 15 in the top surface of the lid 11. The central portion 17 of the top surface is not grooved, as may be noticed from FIG. 5, but this central portion 17 has a cavity 19 therein that is shaped in cross section about as shown in FIG. 3. This cavity 19 is so shaped that it cooperates with a manually applied tool when it is desirable or necessary to remove and replace the charging hole lid 11 in a coke oven coal charging hole.
It is desirable to have a number of grooves 15 in a charging hole lid for a purpose that will be explained hereinafter. Some number such as 36 would be provided in a preferred embodiment of the lid, though more or less grooves may be used as preferred.
FIGS. 4 and 5 illustrate an electromagnet 21 which is in accordance with the invention and which includes a central core 23 having an axial hole 25 therethrough, and a surrounding coil 27 of electrical wire which is connected to an electrical conduit 29. A cover 31 is fastened to the central core 23 in a conventional manner and a cylindrical tubular side 33 is secured to the cover in a conventional manner.
The cover 31 is provided with a plurality of studs 35 that are used to secure the electromagnet to a conventional mounting plate 37 on a larry car. The cover 31 and the cylindrical tubular side 33 are perforated by a plurality of holes 39; there being two such holes 39 disposed on a diameter of the cover 31.
Each hole 39 has a reentrant threaded bore upper portion 41, and a pin 43 having a head 45 is disposed in each hole 39 with the head 45 engaging a shoulder 47. A threaded plug 49 is screwed into the threaded upper portion 41 and into engagement with the head 45 of the pin 43. The plug has a slot 50 in it for easy removal by means of a tool such as a screwdriver.
From FIG. 5 it is seen that the lower or bottom end 51 of the pin 43 is generally conical in shape with a slightly rounded apex. Such conical shape is complementary to the shape of the grooves 15 of FIG. 2.
It will be noted from FIG. 5 that the cylindrical tubular side 33 extends slightly below the bottom of the coil 27 and central core 23 and that there is a narrow air gap 53 between the bottom of the coil 27 and core 23 and the charging hole lid 11.
After a coke oven chamber has been charged with coal, the lid lifter magnet contacts a lid and place it back in its respective coal charging hole. The lid magnet then oscillates the lid in order to seat the lid and to prevent the escape of gases from the oven chamber.
However, as mentioned previously, if a conventional lid has become convexly warped due to heat, the magnet will not grip the lid with enough force to oscillate the lid and seat it properly. However, the magnet of the present invention turns about its vertical axis until one of the pins, acting under the influence of its associated spring, drops into a groove. Further turning of the magnet makes it 3 possible for another, or more than one, pin to drop into a slot or slots. Thereafter, the magnet and pins exert torque on the lid and it oscillates about its vertical axis until it is properly seated.
Those skilled in the art will note from FIG. 5 that, even though the lid becomes warped convexly upward, the pins Will continue to coact with their respective grooves and exert sufi'icient torque to the warped lid to oscillate it and seat it in the charging hole.
Those skilled in the art will recognize that the lid lifting magnet of the present invention is simple and effective and that it provides a positive torque to seat-in the charging hole lid of the invention.
Although the invention has been described herein with a certain degree of particularity, it is understood that the present disclosure has been made only as an example and the scope of the invention is defined by what is hereinafter claimed.
1. A lid for a charging hole in a coke oven chamber and a lid lifting mechanism comprising:
(a) a planar lid having in one surface thereof a plurality of grooves extending from the center of the surface toward the periphery thereof;
(b) a magnet mounted to an oscillateable mechanism and having a plurality of protrusions on a surface that contact said lid; and
() means for oscillating said mechanism and bringing said protrusions into engagement with respective grooves whereby said lid is oscillateable about an axis and is seatable in said charging hole.
2. The apparatus of claim 1 wherein:
(a) said protrusions include pins having one end projecting below the face of said magnet.
3. The apparatus of claim 2 wherein:
(a) said pins are removably secured in said magnet.
4. The apparatus of claim 1 wherein:
(a) said lid includes a cavity adapted to receive a tool for manipulating said lid.
5. The apparatus of claim 1 wherein:
(a) said lid has a chamfered peripheral surface.
6. In a coke oven battery having a coal charging hole, the improved lid for such hole and lid lifting mechanism comprising:
(a) a planar lid having a chamfered peripheral surface and a plurality of grooves extending from a central zone of a planar surface portion of said lid toward the peripheral surface;
(b) a magnet mounted to an oscillateable mechanism for movement about a vertical axis;
(c) a plurality of pins removably disposed in cavities in said magnet with the ends of said pins protruding below the bottom surface of said magnet; and
(d) means for bringing said magnet into contact with said lid and oscillating said magnet mechanism with said pins engaging said grooves in said lid and thereby oscillating said lid to effect seating-in of said lid.
References Cited UNITED STATES PATENTS 3,335,378 8/1967 Corvino 294-65.5 X
3,036,720 5/1962 Malkomes 202-262 X 3,281,880 1/1966 Bender 202--262 UX 3,182,838 5/1965 Brandenbusch 202-25'1 UX FOREIGN PATENTS 410,634 3/1925 Germany 294-655 NORMAN YUDKOFF, Primary Examiner D. EDWARDS, Assistant Examiner US. Cl. X.R.