US3154622A - Adjustable sinter breaker apparatus - Google Patents

Adjustable sinter breaker apparatus Download PDF

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Publication number
US3154622A
US3154622A US30935A US3093560A US3154622A US 3154622 A US3154622 A US 3154622A US 30935 A US30935 A US 30935A US 3093560 A US3093560 A US 3093560A US 3154622 A US3154622 A US 3154622A
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United States
Prior art keywords
sinter
breaker
bars
caps
deck
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Expired - Lifetime
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US30935A
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English (en)
Inventor
Reinfeld Kurt
Robert S Cotton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beazer East Inc
Original Assignee
Koppers Co Inc
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Filing date
Publication date
Application filed by Koppers Co Inc filed Critical Koppers Co Inc
Priority to US30935A priority Critical patent/US3154622A/en
Priority to GB43799/60A priority patent/GB926027A/en
Priority to FR850148A priority patent/FR1279696A/fr
Priority to DEK43248A priority patent/DE1229822B/de
Application granted granted Critical
Publication of US3154622A publication Critical patent/US3154622A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/10—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member
    • B02C4/26—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a grid or grating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/20—Check valves specially designed for inflatable bodies, e.g. tyres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines

Definitions

  • the present invention relates to sintering apparatus for uniformly producing a well-sized sinter product of various different sizes from broken sinter cake, and more particularly, to an adjustable sinter breaker apparatus for breaking hot sinter cake from a continuous sintering machine into different maximum sizes as may be desired from time to time for more efiicient or changing use of the sinter as the charges of blast furnaces, open hearths, and other furnaces.
  • Sinter breakers for the aforesaid uses are commonly designed in advance of use to be adapted to deliver broken sinter at a definite rate in the form of a specific maximum size suitable for a predetermined operation in the furnaces. After the sinter breaker has been in operation for some time, it is often found desirable to alter the size of the delivered broken sinter to a different maximum size, necessitating change in the sinter breaker apparatus in some manner to vary the size of broken sinter delivered by the sintering machine.
  • a primary object of the invention is the provision of a simple, more economical, and facile way, of adjusting the breaker apparatus for controlling the size of sinter discharged from the sinter machine to meet a desired uniform sinter size, or a change in the desired sinter size.
  • the mixture to be sintered is carried in pallets which move in abutting relation along an endless conveyor, the ore mixture being generally sintered in the pallets while moving along the upper run.
  • the sintered cake in each pallet falls by gravity from the pallets as they turn around a bend to enter the lower run for return to the opposite end of the upper run for recharging.
  • the sinter cake falls as a very large cake onto an inclined crash deck which arrests the fall of the cake and breaks the cake into smaller lumps or chunks of a size suitable for further breaking by rotatable breaker teeth.
  • the broken cake pieces then pass by gravity between a breaker deck and a breaker roll to break up the broken pieces of sinter cake into their final size.
  • the breaker deck generally comprises parallel breaker bars, all in a single plane, with the bars evenly spaced from each other and through which teeth arranged on the breaker roll pass in operating to break up the sinter pieces to the desired final size.
  • the teeth are arranged on separate wheels in a row on the breaker shaft, the teeth on each wheel can be staggered relative to those of the adjacent wheels and spaced from each other and rotatable above the top of the breaker bars in the breaker deck for breaking the larger pieces of sinter from the crash deck into smaller pieces, which all pass through the deck to a screen, which separates the sinter pieces of the desired size for delivery to the desired use from the smaller sizes which are recycled back to the sinter strand as sinter mix and as a hearth layer for the sinter strand.
  • the size of the desired pieces of sinter is determined by the width of the space between the breaker bars and the size or thickness of the teeth on the breaker roll.
  • the sinter is generally hard and well fused, and the roll is operated at a rate greater than the rate of discharge of the sinter from the sinter strand to ensure that there will be no objectionable accumulation on the sinter crash deck and breaker deck above the breaker roll while serving to break the larger pieces from the breaker deck into the desired smaller size sinter and also functioning as a retarder for the sinter sliding down by gravity from the crash deck to the breaker deck to enter between the teeth of the breaker roll and the top of the breaker bars in the area where the teeth sweep through the spaces between the bars.
  • the surfaces of the bars and teeth are subjected to great striking forces and wear, and so, they are conventionally lined or coated with greater wear-resistant material than the material the bars are made from.
  • the present invention provides an arrangement for adjusting the breaker openings which eliminates the necessity of replacing the breaker bars or dismantling the breaker roll in order to vary the size or" the openings between the bars through which the sinter passes, when it is desired to change the sinter size, or the sinter size becomes too large, due to wear of the surfaces of the bars in the area of the deck where the teeth sweep through the deck to break the sinter into the desired sinter size.
  • the present invention makes possible the provision of several sizes of openings in the breaker deck with a fixed spacing of the breaker teeth or wheels on the rotary shaft, by varying the size of the openings in the area of the deck where the rotatable breaker teeth sweep through with easily replaceable wear caps of different widths located on the portions of the bars in that area of the deck.
  • two sets of caps suffice for the purpose-one a wide set of caps of great enough width to ensrnall the opening between adjacent bars, and one a narrow set of caps of sufiiciently less width to leave a larger opening between the same bars to produce a significantly larger size sinter.
  • the tops of the bars are formed with a medial ridge along the same in at least the area of the deck where the teeth sweep through the spaces between the bars, and the caps are constituted of inverted U-shaped channel form to seat over the ridge, with a slight clearance between the top and sides of the channel and the ribs, so that the base of the sides of the channels seat directly on the lower bearing surfaces of the bars along the opposite sides of the ridge.
  • all crushing forces are transmitted by the caps around the rib and directly to the lower bearing surfaces of the bars, so that the cracking of the caps does not occur in use in breaking the sinter.
  • the sinter breaker apparatus of the present invention is primarily designed and particularly adapted for use in continuous in-line sintering systems, wherein the material is sintered in pallets on the upper strand of an endless conveyor and the hot cakes of sinter broken, as they fall by gravity at the discharge end of the sintering machine, into smaller pieces of the desired size and then delivered for cooling of the sinter into pallets on the upper strand of an endless conveyor sinter cooler in line with the sintering machine for cooling of the broken sinter with air before delivery to its point of storage or use, whereby to attain more rapid and efiicient cooling of the hot sinter with less degradation of the same into smaller sizes requiring recycling of the same into the sinter mix for reprocessing into the larger sizes desired for delivery for the intended use of the sinter.
  • the present invention will be confined to this use of the invention; it will be understood, however, that the invention is capable of other applications, for example, it may be applied to sinter systems with other types of coolers for the sinter, and even with sinter systems in which the sinter is cooled in the later stages of the upper strand of the sintering machine before the cakes are discharged for breaking and crushing by the breaker apparatus of the invention.
  • FIGURE 1 is a conventional diagrammatic side elevational view illustrating the best mode of practicing the invention in an in-line system for sintering and cooling;
  • FIGURE 2 is an enlarged vertical cross-sectional view of the crash deck, breaker deck, and breaker roll, as shown in FIGURE 1;
  • FIGURE 3 is an end elevational view taken on the line III-III of FIGURE 2;
  • FIGURE 4 is a top plan view taken on the line IV-IV of FIGURE 2;
  • FIGURE 6 is a vertical cross-section taken on the same line V--V of FIGURE 4, showing the openings between the breaker bars using wide wearing caps;
  • FIGURE 7 is a side elevational view of one of the breaker bars Without the cap thereon;
  • FIGURE 8 is an enlarged vertical cross-sectional view of the same taken on the line VIIIVIII of FIGURE 7;
  • FIGURE 9 is an end elevational view of the bar of FIGURE 7 taken on the line IXIX of FIGURE 7;
  • FIGURE 10 is a side elevational view of one of the wearing caps
  • FIGURE 11 is a vertical cross-sectional view taken on the line XI-XI of FIGURE 10, to shoW the relative dimensions of the narrow wearing caps in relation to the wide caps shown in FIGURE 12;
  • FIGURE 12 is a vertical cross-sectional view taken on i the same line XIXI of FIGURE 10, to show the relative dimensions of the wide caps in relation to the narrow caps, as shown in FIGURE 11.
  • the invention can be embodied in any one of a number of types of endless pallet sintering machines and, by way of example, is disclosed as embodied in a continuous in-line sintering machine, such as one composed of the sinter machine as disclosed in R. A. Powell, Patent No. 2,890,038, dated June 9, 1959, and of the sinter cooler of R. A. Powell, Patent No. 2,823,913, dated February 18, 1958.
  • the construction and operation of this type of sintering machine and cooler are Well known in the art, and a brief description thereof will suflice.
  • the sintering machine as shown in FIG- URE 1, comprises a suitable frame carrying an endless track having an upper run 2 and a lower horizontal run 3 upon which travel the upper run and lower run of a train of pallets 4.
  • the pallets are raised by known sprocket means from the lower run 3 to the upper run 2 position of the track about a return bend.
  • Each pallet 4 comprises a frame which carries a suitable grate, and the pallets on the upper run of the track are in front and rear endwise abutting con-' tact providing a continuous traveling grate structure, the pallets being mounted with wheels for travel on the tracks,
  • a charging chute 8 is positioned at the feed end 7 of the machine to provide the pallets with a bed of material to be sintered, the bed being supported by the pallet grate structure and traveling therewith.
  • the pallets pass along the upper run 2 from the charging chute 8 to an igniter 1 where the top of the bed of material is ignited.
  • igniter 1 where the top of the bed of material is ignited.
  • wind boxes 10 These boxes are connected by conduits to a manifold, which in turn is connected to the intake of a suction fan, as shown, the outlet of the fan being connected to a conduit which goes to a stack for discharge of the gases into the atmosphere.
  • the fines and smaller pieces of sinter pass through a screen 17 into a hopper 18 positioned below the breaker deck 14, said hopper also being provided with a screen and discharge spouts, for conveyance of fines and intermediate sizes of sinter back as a hearth layer and as sinter mix.
  • a hood is usually positioned above the screen 17 and breaker deck 14 to extend over a portion of the upper run of pallets at the discharge end 11 of the sinter machine, to convey air carrying dust given off from the sinter at the discharge end 11 of the machine, back into the process.
  • the air for sintering passes through the portions of the sinter bed as it moves toward the discharge end 11, and thence, through the grate in the pallet frame, into the tops of the wind boxes 10, whence the combustion air is withdrawn by the suction fan to the stack.
  • the sinter size desired to be delivered from the system as the final product of the process for use in metallurgical furnaces is delivered over an inclined distributing plate 19 onto the upper strand of a sinter cooler, preferably of the aforesaid Powell aircooled type, as illustrated in FIGURE 1.
  • Said cooler also comprises, FIGURE 1, and endless track supporting structure, having an endless track, including upper and lower horizontally disposed flights 21, 22.
  • Pallets 23 having the front and rear wheel pairs are adapted tov ride on the endless track and positioned beneath the pallets and opening thereto are a succession of wind boxes 24, the wind boxes being adapted to push cooling air upwardly through the sintered material supported on louvers as the grate of the pallets 23.
  • This cooling arrangement is accomplished through a fan assembly which, for example, can be a 120,000 cubic feet per minute fan operating at inches of water.
  • the fan assembly is connected to an air main, which in turn is connected through wind box inlets and ultimately to the wind boxes 24.
  • a hood is usually superposed above the cooling structure, which hood can extend the entire length of the structure, however, in some instances, it would only be necessary to have this hood extend a partial length of the strand 21, the hood being only necessary in the early stages of the cooling.
  • the hood is usually connected to an exhaust main through hood offtakes, the exhaust main in turn leading to an exhaust stack, as disclosed in FIGURES 1 and 2 of the drawing of said Powell Patent No. 2,823,913.
  • the pallets 23 are driven along the endless tracks 21, 22 by a sprocket driving arrangement as is known in the sintering art.
  • the last louver of one pallet changes position with respect to the first louver of the next following pallet. This action is helpful in freeing the cooled sinter material for the discharge of said material from the sinter cooler.
  • the sinter to be cooled is fed onto the pallets 23 at the right-hand portion of the sinter cooler of FIGURE 1.
  • the pallets 23 then pass from the right to left under the hood.
  • the sides of the pallets 23 engage with hood in known manner to minimize escape of air therefrom.
  • Motors power the fan assembly and provide air through a main, to inlets of the wind boxes 24.
  • the air then passes upwardly through the louvers of the grates of the pallets 23, through the sinter bed and is exhausted through the hood, the hood offtakes, the exhaust main, and the stacks.
  • the breaker deck is provided, as shown in FIGURES 2 to 6, with a plurality of sets of replaceable Wear caps 26 for at least the area of the deck 14 where the teeth of the breaker roll 16 sweep through the spaces 27 between the bars 15.
  • a plurality of sets of replaceable Wear caps 26 for at least the area of the deck 14 where the teeth of the breaker roll 16 sweep through the spaces 27 between the bars 15.
  • wear caps designed for altering the width of the spaces 27 between the bars 15, in the event it is found necessary to change the maximum size of the sinter delivered as a final product from the cooler to the conveyor 25.
  • the breaker roll 16 is provided with wheels 28 in fixed relation thereon relative to the centerline of the spaces between the bars 15, and are each provided with a plurality of teeth or blades 29.
  • the blades or teeth 29 on adjacent Wheels 28 are staggered relative to each other in a row crosswise of the line of flow of sinter down the crash deck 13 and over the breaker deck 14.
  • the teeth 29 on each wheel are centered relative to the longitudinal center of the spaces 27, and the bars are evenly spaced from each other across the deck 14 to provide a constant space between each two adjacent bars 15.
  • the front 30 and rear 31 frame members of the breaker deck 14 are partitioned by plates 32 to provide evenly spaced seats 36 for the ends 33 of the bars.
  • the front frame member 31 is readily accessible for easy removal of the bars 15 by inserting them through front spaces 6 34 therein, and the front ends of the bars are fastened there by means of detachable fasteners 35. At their rear ends, the bars are loosely seated on the evenly spaced seats 36 and supported against tilting by the spacer elements 32, as will be seen from FIGURE 2.
  • the bars 15 may be readily detached and Withdrawn through the front spaces 34, after detaching the securing means 35, and then the caps 26 detached and replaced by other Wear caps 26, and the bars 15 reinserted again through the front spaces 34 for reseating on their seats 32, and the fasteners 35 afiixed.
  • the surfaces of the wear caps 26 for the bars are coated with a more resistance material than the material of the bars, to withstand the breaking and crushing forces imposed on the caps 26 by the sinter when broken thereon by the teeth 29 of the roll 16.
  • the caps 26 may extend throughout the entire length of the bars 15, but preferably, extend along only the area of the deck 14 in which the breaking forces are exerted on the sinter by the rotary action of the teeth 29 that are fixed to the breaker roll for rotation thereby, as shown in FIGURES 2 and 4.
  • the bars are made, as shown in FIGURE 7, so as to be reversible. That is, both ends 33 are made alike so either end may be inserted first through the front spaces 34 for seating the ends 33 of the bar-s 15 on their seats 36.
  • the bars 15 and caps 26 are so constituted as to eliminate this.
  • the top of each bar 15 is constituted of a medial ridge 37 throughout the greater part of the length of the bar 15 with a crowned top 38 and vertical sides 39 and the portions 41) of the top of the bar 15 along the two opposite sides of the ridge 37, at the base of the sides 39 of the ridge 37, are formed flat and horizontal throughout to constitute the bearing seat for the caps 26.
  • the caps are of inverted channel shape with vertical outer sides 42 and a crowned outer top 43.
  • the inner side walls 44 of the channel are likewise vertical, and the inner top 45 of the channel area 46, is likewise crowned.
  • the distance between the inner side walls 44 is slightly greater than the width of the ridge 37, and the inner top 45 of the channel is at a distance from the base of the inner side walls 44 slightly greater GA") than the height of the 1idge37 so that when the caps 26 are secured in place on the ridge 37, there is a clearance between the ridge top 38 and sides 39 and the inner top 45 and inner sides 44- of the channel 46 in the cap, whereby the cap 26 seats only at the base 47 of the sides 42 thereof on the lower horizontal top portion 40 of the bars 15 along the opposite sides 39 of their ridges 37.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Geology (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Food Science & Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
US30935A 1960-05-23 1960-05-23 Adjustable sinter breaker apparatus Expired - Lifetime US3154622A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US30935A US3154622A (en) 1960-05-23 1960-05-23 Adjustable sinter breaker apparatus
GB43799/60A GB926027A (en) 1960-05-23 1960-12-20 Improvements in or relating to an adjustable sinter breaker
FR850148A FR1279696A (fr) 1960-05-23 1961-01-19 Perfectionnements apportés aux broyeurs réglables, notamment pour agglomérés
DEK43248A DE1229822B (de) 1960-05-23 1961-03-21 Vorrichtung zum Zerkleinern von Sintergut

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US30935A US3154622A (en) 1960-05-23 1960-05-23 Adjustable sinter breaker apparatus

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US3154622A true US3154622A (en) 1964-10-27

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US (1) US3154622A (de)
DE (1) DE1229822B (de)
FR (1) FR1279696A (de)
GB (1) GB926027A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848744A (en) * 1972-12-04 1974-11-19 J Flaherty Green pellet sizing screen
US3897015A (en) * 1971-04-01 1975-07-29 Nippon Steel Corp Crusher plate
US4601430A (en) * 1984-05-10 1986-07-22 Northern States Power Company Ash grinder for scrubber system
US4753395A (en) * 1987-01-28 1988-06-28 Ralston Purina Company Lump breaker for food processing
US4949908A (en) * 1989-10-23 1990-08-21 Helmut Habicht Rocker-type lump breaker
US5133852A (en) * 1990-07-30 1992-07-28 Wark Rickey E Coal sizing grid
US5310065A (en) * 1990-07-30 1994-05-10 Sure Alloy Steel Corporation Self-cleaning coal bypass and debris separation grid assembly with rotary clearing mechanism
US5375774A (en) * 1991-07-18 1994-12-27 Perry; Timothy J. Tip separator and method of operation for fluorescent tube digester

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540955C2 (de) * 1975-09-13 1982-05-19 Metallgesellschaft Ag, 6000 Frankfurt Sinterbrecher
FR2460715A1 (fr) * 1979-07-09 1981-01-30 Sib Metall Instit Procede de concassage d'agglomeres et appareil pour sa mise en oeuvre

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE22836C (de) * P. sladeck in Hannover Apparat zur Darstellung von Zuckerkalk aus zuckerhaltigen Substanzen
US12597A (en) * 1855-03-27 elliot
US24316A (en) * 1859-06-07 Furnace grate-bab
US1476337A (en) * 1922-07-14 1923-12-04 Rosedale Foundry & Machine Com Furnace grate
US2278317A (en) * 1940-07-30 1942-03-31 Hulson Grate Company Grate structure
US2278316A (en) * 1940-03-22 1942-03-31 Hulson Grate Company Grate structure
US2283053A (en) * 1939-10-20 1942-05-12 American Lurgi Corp Sintering device
US2558107A (en) * 1946-02-15 1951-06-26 Forrest E Smith Hammer for impact pulverizers
US2578426A (en) * 1949-01-04 1951-12-11 Holmberg Anders Sintering ores and the like
US2763479A (en) * 1955-03-22 1956-09-18 Gutehoffnungshuette Sterkrade Apparatus for sintering ores and the like
US2965321A (en) * 1958-11-21 1960-12-20 Dravo Corp Sinter breaking apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964050A (en) * 1932-07-21 1934-06-26 Ludwig Kern Rotary breaker
GB824837A (en) * 1958-06-30 1959-12-09 Metallgesellschaft Ag Improvements in or relating to breakers or crushers

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE22836C (de) * P. sladeck in Hannover Apparat zur Darstellung von Zuckerkalk aus zuckerhaltigen Substanzen
US12597A (en) * 1855-03-27 elliot
US24316A (en) * 1859-06-07 Furnace grate-bab
US1476337A (en) * 1922-07-14 1923-12-04 Rosedale Foundry & Machine Com Furnace grate
US2283053A (en) * 1939-10-20 1942-05-12 American Lurgi Corp Sintering device
US2278316A (en) * 1940-03-22 1942-03-31 Hulson Grate Company Grate structure
US2278317A (en) * 1940-07-30 1942-03-31 Hulson Grate Company Grate structure
US2558107A (en) * 1946-02-15 1951-06-26 Forrest E Smith Hammer for impact pulverizers
US2578426A (en) * 1949-01-04 1951-12-11 Holmberg Anders Sintering ores and the like
US2763479A (en) * 1955-03-22 1956-09-18 Gutehoffnungshuette Sterkrade Apparatus for sintering ores and the like
US2965321A (en) * 1958-11-21 1960-12-20 Dravo Corp Sinter breaking apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897015A (en) * 1971-04-01 1975-07-29 Nippon Steel Corp Crusher plate
US3848744A (en) * 1972-12-04 1974-11-19 J Flaherty Green pellet sizing screen
US4601430A (en) * 1984-05-10 1986-07-22 Northern States Power Company Ash grinder for scrubber system
US4753395A (en) * 1987-01-28 1988-06-28 Ralston Purina Company Lump breaker for food processing
US4949908A (en) * 1989-10-23 1990-08-21 Helmut Habicht Rocker-type lump breaker
US5133852A (en) * 1990-07-30 1992-07-28 Wark Rickey E Coal sizing grid
US5310065A (en) * 1990-07-30 1994-05-10 Sure Alloy Steel Corporation Self-cleaning coal bypass and debris separation grid assembly with rotary clearing mechanism
US5375774A (en) * 1991-07-18 1994-12-27 Perry; Timothy J. Tip separator and method of operation for fluorescent tube digester

Also Published As

Publication number Publication date
GB926027A (en) 1963-05-15
DE1229822B (de) 1966-12-01
FR1279696A (fr) 1961-12-22

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