US1830951A - Pusher ram for coke ovens - Google Patents

Description

J. A. B. LOVTT PUSHER RAM FOR COKE OVENS Nov. 10, 1931.

Filed April 12, 1927 2 Shets-Sheet 2 Patented Nov. 10, 1931 COMPANY, ACORPOIR-ATION 0F DELAWARE A 1 TUSHER RAM roRcoxEf1ovENsl y Application mea Apfn 12,'

My invention relates to pusher ramspforiv coke ovens of the horizontal type. My invention has for one lof its ob]ects toprovide alpusherram of such form and construction that it will operate to remove a chargeof coke from a coke oven with mm1- mum force applied thereto. L

=A further object of ymy invention 1s to provide a pusher ramior coke ovens by means of which coke may be removed therefrom with minimum formation of coke breeze and broken coke. y y

In the operation of pushing coke ovens vas "usually practiced, the pusher rams that are usually employed are provided with' a vertical face which simultaneously engages the entire end surface of the charge of coke. It is a well-known fact that the greatest resistance tov be overcome bythe pusher ram 204 is Vat'thebottom of the oven, lby reason of the roughness of the oven floor andibecause' the weightof the charge is supported by the Hoor.

In case the charge ofcoke has` a tendency to stick in the oven, it is necessary to advance the ram a considerable distance against the entire end of the charge before the coke begins to move. The result is that consid-y, erable coke is crushed and coke breeze formed. l .30,

The crushing of the coke causes a certain portion of the coke body to engage the side walls ofthe oven yand thus `add to the re-` sistance caused by theweight on the oven Hoor. The resistance caused b the loose'colre increases approximately vwit from the top of the column. ,y

I have found that, if 'suiiicient applied to the bottom layer of coke before any pressure is applied to the remainder .themcoke, the entire charge maybe moved with materiall less power applied to the pusher ram. or example, acert'ain force has been required to ush an oven Vwith thek ordinary pusher ram aving a straight vertical face. When a block was employed at the base of theljoven, to engage the bottom layer of coke in advance of the remainder ofthe face of the ram head,'a verymuch smaller force was required to move the coke.

In accordance with my invention, I prothe distance r lpressure be naar, serieur No. 153,093.

vide a pusher ram with-la" headk having a; bot'.'

i' L UNITED. STATES PATENT "j JAMES A. B. LovETT, or. PITTSBURGH, PENNSYLVANIA, AssrGNoR To THE xoPrERs;

In a modified form of the invention, the facel of the pusher ram head is arranged in ksteps that are spaced approximately in accordance with the difference vin the pressures to be" overcome at the variouslevels in the charge of coke, incase thev charge tends tostick in the oven and loose coke isfformed.

Reference may panying drawings, in which ',Figureql is a view,`in'vertical section, of a portion of a cokefoven battery and associated apparatus embodying my invention" the apparatus being shown in elevation; Fig. 2 is a sideelevational view of al pusher ram 'y embodying brokenl away; and Y.

Fig'n is asimilar view of a modiiication.

eferenc'e f which a cokeoven battery, only a lportion' of which is shown, comprises a series ofcoke ovens 2, through one of which the sectional view is taken. The coke oven 2is provided with a floor 3 and With a top y5, through which.Y

ries a pusherram' 14. The pusher ram com-M.

now be had tothe accom my invention, parts being The oven 2is also provided prises a' relativelylongjbar 15 thatfis pro.-rv

vided with rack teeth 16y wherebythe pusher ram may be" drivenby an electric motor 17, and suitablel gear mechanism 18. .The bar 15 is mounted 1 for` longitudinal movement on rollers 19- The pusher ram isprovided `with a head 20 for engaging thecoke during the pushing operation. The pusher machine 12' also carries the usual; leveller bar 21, the de#v tails of which formno partfof the present invention. 4 y

Reference may nowvb'e had to Fig. 2, which is V'an enlargedview of certain portions of the pusher ram 14. Theram is provided with a 'supporting shoe 22, the details of which constitute the subject-matter of a copending application. The head 20 of the pusher ram is provided at its lower portion with a projecting portion 23 having a vertical face 24 that is offset from the vertical face of the main portionof the head 20.

Theface 24, the height of which is small relative to that of the face 25, extends in advance of the face 25Vby a distance that is approximately that 'necessary vto secure vthe movement of the bottom layer of coke simultaneously with the engagement of the remainder of the charge by the face 25.` lBy way of example, the height of the fac-e V274V may be about twelveinches andthe faces 24 and 25 may be spaced a similar distance.

is constituted yby a swinging plate or flapper77 plate 26`that is pivotally mounted at 27 and is preferably provided withia counter-l weight 28. The'flapper plate is arranged to move forwardly with respect to its vertical position but is rigidly held against any rear-` ward movement from such position.

In the operationsof the ram illustrated in Figs. l and 2, it being assumed that the door shown in Fig. 3, the face 24 is provided and` 9 of the coke oven has been removed, the ram is advanced by the motor-drivengear mechanism 18 fromthe position in which it is illustrat-ed in Fig. l to engage the charge of coke.

The face 24 engages'the bottom portion of the charge and the force of the ram is concentrated thereon. When the ram is moved to advance the projection 23 into the coke,

, the latter may begin to move somewhatbefore Aor about simultaneously with the vengagement of the face 25 with'the end of the charge.

The entire charge then moves forward as a body and there is yno tendency for the top portion of the charge to move in advance of the bottom portion. Accordingly, the body of coke moves through tliecoke guideon the coke side of the battery without the spillage that accompanies the'pushing operation as in present practice.vv By reasonof'the fact that the engaging facesl are vertical, even though they are, offset thejone from, the other, there is no'component` of force tending to either cause'the coke to be lifted inthe oven or to cause theram to exert an abnormal force upon the floor of the oven.`

f Vhen the charge of coke `has been completely removed, the raniis returned by reversing the driving mechanism. j During the return of thev ram, the lapper plate 26 Vswings readily to permit any loose coke to pass thereunder in order that it may not be dragged along the floor of the oven:v The ram is then returned to its illustrated positionin'readi-` ness for the succeeding operation. In the modified form yof pusher head 30 in addition, faces 31, 32 and 33 are arranged steps.4 This arrangement is provided for 'with the weight of the charge and that the resistance of the bottom surface of the coke vvillbe materially greater since the weight of the entire charge is supported by the floor of the oven Accordingly, aV curve which represents the resistances will be substantially a straight line for the upper portion of the Y charge and there will be an abrupt bend in The' lower portion of the vertical face 24 the various ovens to'be pushed and that only an approximation is possible.

When the ram constructed as in Fig. 3 is employed iny pushing a coke oven under normal conditions, the operation is substantially similar to that previously described in vconnection with the ram of F1g.2 in that the force is concentrated atthe bottom of the oven and that movement of the' chargemay begin more or less independently of the engagement of the faces above the face 24. However, when the charge sticks in the oven and coke is crushed, the various engaging faces engagek the coke at intervals that correspond substantially tothe diferences in resistance to be encountered at the various levels engaged thereby.l Accordingly, when the entire head is engaged, the horizontal faces support the loose coke and spillage is prevented. y

It will readilybe appreciated that the amount of coke breeze resulting from the 'operation of a pusher ram of my invention willbe materially less than that when the pusher head is not shaped to some degree in accordance ywith the resistances to be encountered. i

I have provided animpvroved' lpusher ram vbymeans of which pressure is applied inare no vertical components ofthe 'force ap-` plied b'y the pusher `ram which tend to cause either the coke to rise against vthe roof of the oven or theram vto bear heavily upon the floor of the oven.

i My invention may be embodied in various forms and it is not desired to 'limit it to the vus specific embodiments shown and described herein. The scope of m invention is limited only by the appended c aims.

I claim as my invention 1. A pusher ram for coke ovens compris ing a head having a plurality of vertical faces forV engaging a charge of coke, said' vertical faces being offset extending rear-` wardly from the bottom face.

2. A pusher ram for' coke ovens having vertical portions for iirst engaging the charge of coke to be pushed in the region that normally offers the greatest resistance and for slbsequently engaging other portions of the c ar Y ghe method of pushing coke Jfrom a horizontal Vcoke oven'which comprises rst applying pressure to a vertical face of the bottom portion of the charge of coke Where the resistance is greatest and then applying pressure to other ortions of the charge.

4. A pusher ram or coke ovens comprising a vertical bottom portion for engaging a charge of coke in advance of the remaining portion of the head and a substantially vertlcal upper portion horizontally .offset from said vbottom portion.

In testimony whereof, I have hereunto subscribed my name this 11th day of April,`

JAS. A. B. LOVETT.

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