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US1811020.Pdf June 23, 1931. B. V. NORDBERG 1,811,020 BEVERSIBLE ROLLING MILL ENGINE Filed May 21, 192s 8 Sheetg-Sheet l «m8S.,A \\\\ MEME.,„rk/ ivv l Glicine June 23, 1931. B. v. NORDBERG 1,811,020 REVERSIBLE ROLLING MILL ENGINE . Filed May 21, 1925 8 sheetsàsheet 2 QN NN WK O O 5amwxhä Nhä .mw NS , ä« MR .LähÈQ \o0onww ‘NNWN ww.,KK ‘sC mw@A L?@y `|I! QN wäí;_aä @làâ Q» â.. , mw1_Í atroz “WJ `lune 23, 1931. B..v; NORDBERG 1,811,020 REVERSIBLE ROLLING MILL ENGINE Filed May 21, 1925 8 Sheets-Sheet 5 Elibtoz/s m30, A June 23, 1931. B. v. NoRDBl-:RG 1,811,020 REVERSIBLE ROLLING MILL ENGINE Filed May 2-1, 1925 8 Sheets-Sheet 4 / fm. MÍ, r¿L ß„M ma@ ë@Wwavy„_ y ¿5% June 23, 1931. B. v. NORDBERG ­ _ _1,811,020 REVERSIBLE ROLLING MILL ENGINE Filed May 21. 1925 ` 8 sheets-'sheet 5 « òA. Júne 23, 1931. B, v_ NORDBERG 1,811,020 REVERSIBLE ROLLING MILL ENGINE Filed May 2l, 1925 8 Sheets-Sheet 6 . OPERATING LEVER ~ NEUTRAL. ’/ l \ OPERATING I_EvERf» . \\ MAXIMUM ovER. 86”/ OPERATING LEVER 82, i , MAXIMUM IINIIER` "A yg /ag /. «LQUADRANTNEUTRAL. ¿_Q QIIADRANT :v MAX. UNDER June 23, 1931. B. v. NORDBERG 1,811,020 REVERSIBLE ROLLING MILL ENGINE Filed May 21, 1925 8’Sheets-Sheet- 7 30 l \ W. June 23, 1931. By. NORDBERG 1,811,020 REVERSIBLE ROLLING MILL ENGINE Filed May‘zl, 1925 BÀsheets-sneet _e 11 v (n / ` ` la@ l l. \\\\\\\\\\\\\\\\\\\\\ \\ . , Q ÄÑ o lill/11M 13TH/2.0 U /Vordßergjßececzsed- ' _ Helena Gl/ordbçzëßß'xeczzìrbg ' duck „gp Patented June 23, 193i A 1,811,020 UNITED STATES PATENT oFFlca BRUNO V. NOlitDBlîllEtGr,• DECEASEI), LATE OF MILWAUKEE, WISCONSIN, BY HELENA. C. NORDBERG, EXECUT'RIX, OF MILWAUKEE, WISCONSIN REVERSIBLE ROLLING MILL ENGINE Application ?led May 21, 1925. Serial No. 31,954. This invention relates to steam engines and the proper speed until the pass is completed. particularly to reversible engines for roll As the work leaves the rolls, the develop ing mill duty, ment of power must be suddenly checked so So far as applicant is advised, no one has that the engine will not race. Moreover, it heretofore produced a reversible engine forA 1s sometimes necessary to reverse or to start rolling mill service using high initial pres under full load, and this means that the cyl sure and a high ratio of expansion. The inders must develop ample power in the worst present invention produces an engine of such possible crank position. type which is now in successful operation, The customary solution of this problem is 60 'Il and which, as a result of high pressure, super to use two double-acting cylinders with the heat, and expansion, is giving good steam cranks set quartering. Such an engine is or economy. Furthermore, this engine is con dinarily equipped with slide valves of either trolled directly by manipulation of the re the .flat or piston type, and the cut-oil is ordi vel-sing gear and has no regulation by throt narily at about 90% of the stroke. Slide tle such as has been the universal practice in valves give large cylinder clearances and 65 rolling mill engines heretofore. long’cut-offs preclude economical steam eX Many of the features of this new engine, pansion, so these two factors combine to pro individually considered, are not new in other duce gross waste. A consideration of the relations. These elements are, however, crank effort diagram of any two-cylinder, combined in a new relation to produce the double-acting reversible rolling mill engine7 desired result, and certain of them are modi with the cranks at 90°, shows that the crank ‘ fied to give them new and heretofore unde eífortt‘ends to be very irregular. yAccord sired characteristics, adapting them to this 1ngly,_1n order to secure relatively smooth particular field of use. In order that the operation (in the absenceof the regulative importance of these various adaptations and efl’cct of a fly wheel) it is necessary to throt 75 modilications of detail may be fully appre tle the inlet steam. ciated, it is desirable iirst to outline the re The combined eli’ect of a long cut-od, large quirements of the service and the manner in clearance spaces and throttled inlet is neces` which these have heretofore been met. In sarily very poor efliciency, and it is a fact this way the important considerations con notorlous in the art that reversible rolling 80 trolling the design of an engine constructed mill engines are among the least economical according to the present invention may be steam prime movers now in use. Neverthe made clearer than is otherwise possible. less, engines of this type of extremely large In the operation of two-high rolling mills power are extensively-used in the steel in« it is necessary to reverse the rolls and conse dustry. ~ ' quently to reverse the engine. rl‘his reversal It follows that the production of an eco must be quickly eifected, and that fact, as nomical reversible engine of this type which well as the necessity of quick stopping and will meet the severe requirements of rolling starting, precludes the use of fly wheels. In millservice is a matter of considerable eco 90 fact. the ideal reversible rolling mill engine nomic importance. has the minimum possible momentum in pro It is obvious that7 if an engine ­is to oper portion to the power which it develops. ate smoothly without a fly wheel and without This means that the entire torque must at throttling regulation at’relatively short cut all times be developed by the engine without ofîs, it must have a relatively large number i assistance from the momentum of moving masses. The engine must be capable of of cylinders, and almost the first considera starting and running smoothly before the tion in the development of an engine of this billet enters the roll. It must develop im type is to determine how many cylinders shall mediately an increase of power as the piece be used. On this will turn a number of im enters, and must then continue to operate at portant details añecting'the type of cylinder 2 and the nature of the steam valves and the Having arrived at the conclusion that four valve-actuating gear. or more cylinders are desirable, the next The controlling factor in the size of the en question is as to the type of cylinder. It is gine, i. e., the total cylinder volume, is the lli hl important to reduce clearance in the ratio of thc minimum crank effort- to the aver cy in er and the conventional types of ex age, for as has been stated, the engine must haust valve are the greatest sources of such be able to start under full load with the clearance. This suggests the desirability of cranks in the most unfavorable position. The using the so-called unifiow or terminal ex first step is to lay out a diagram showing the 10 haust type of cylinder. This type is well starting crank effort. Such a diagram must adapted to large power units, and has been 75 ignore all the efforts produced by each cylin adopted for use in the present engine. » Be der beyond its point of longest cut~oif, for in side the reduction of clearance which it er starting only those cylinders which have not mits, it has the additional advantage ofp re yet reached such oint of cut-0E are effective. 15 quiring no reversing gear for actuatin eX The following ta le gives the resulting val haust valves. Such gear, because of the Targe 80 ues for engines having, two, three, four and Size of the valves and the power necessary to five cranks, the cranks being assumed to be actuate them, would be cumbersome and so arranged that the dead center positions would greatly complicate the maneuvering of the pistons are spaced equally in a revolu of the engine. 20 tion. Since the piston in a uniflow engine alone controls the exhaust, and since a rolling mill Ratio {AverageMinimum starting starting efîort eñ'ort engine must stop, start, and reverse in every Point of cut-on! position of the pistons, some means must“ 25 2 cranks 3 cranks 4 cranks 5 cranks be provided to unload the cylinders at the time of starting and reversal, as otherwise 90 0. 90 0. 58 0.81 0. 79 0.83 the confined steam would render maneuver 0, 80 0.»43 0. 55 0. 70 0. 78 ing impossible. This unloading must occur 0. 70 ____________________ __ 0.30 0. 48 0.62 0.70 o. 6o ____ __ o. 16 o. 44 c_sî o. 65 automatically as an incident to starting the 30 0.50 ____________________ ._ 0. 0.38 0. 44 0.55 engine in either direction. Generally stated, 0.40 0. 27 0. 39 0. 40 this problem is solved by actuating the inlet 0. 30 0. 057 0. 30 0.35 valves by a reversing valve gear which has The data for two cranks shows clearly a greater travel in full gear position both forward and reverse than it has in interme why approximately 90% cut-off is customary diate positions. This greater travel in these 35 with such engines, and why shorter than 80% cut-off is not used. The table shows that four two extreme positions is used to actuate un 100 engines of approximately the same total cyl­` loading valves associated with the inlet inder volumes, but differing in the number valves.
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