US3853458A - Rotary drum for the heat treatment of strongly erosive material - Google Patents

Rotary drum for the heat treatment of strongly erosive material Download PDF

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Publication number
US3853458A
US3853458A US00418887A US41888773A US3853458A US 3853458 A US3853458 A US 3853458A US 00418887 A US00418887 A US 00418887A US 41888773 A US41888773 A US 41888773A US 3853458 A US3853458 A US 3853458A
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US
United States
Prior art keywords
drum
wear plates
rotary drum
wall
lifting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00418887A
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English (en)
Inventor
J Wurr
A Vering
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Polysius AG
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Filing date
Publication date
Application filed by Polysius AG filed Critical Polysius AG
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Publication of US3853458A publication Critical patent/US3853458A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
    • F27B7/16—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means
    • F27B7/161—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means the means comprising projections jutting out from the wall
    • F27B7/162—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge the means being fixed relatively to the drum, e.g. composite means the means comprising projections jutting out from the wall the projections consisting of separate lifting elements, e.g. lifting shovels

Definitions

  • ABSTRACT A plurality of lifting blades comprising scoop-edges and flat feet are replaceably affixed to the internal drum wall.
  • a pair of wear plates lining the internal drum wall have opposed edges parallel to the drum axis that are spaced apart and lie'under each lifting blade foot.
  • This invention relates to a rotary drum for the heat treatment of strongly erosive material, with a number of lifting blades replaceably affixed to the internal drum wall and comprising scoop edges, wherein the flat feet of the blades on the internal drum wall also fix in place adjacent wear plates which extend between the lifting blades and have recesses for correspondingly shaped projections which extend from the lifting blade feet and lie against the internal drum wall.
  • rotary drums of this type are traversed by a hot gas stream, intended to produce the required heat treatment by heat exchange between the stream of gas and the material being treated.
  • a hot gas stream intended to produce the required heat treatment by heat exchange between the stream of gas and the material being treated.
  • the material being treated be fed through the drum in as loose a condition as possible. For this reason the material is raised by the lifting blades and conveyed axially through the drum in the form of a cloud.
  • the lifting blades and their interposed wear plates are subjected to more or less intensive wear, so that these parts have to be replaced from time to time.
  • Rotary drums are known wherein the lifting blades are provided with integral feet so formed that in their extension in the peripheral direction of the drum these feet at the same time constitute the wear plates.
  • a serious defect of these known constructions is that in practice the wear plates are not subject to such heavy erosion or wear as the actual lifting blades, but when replacement of the lifting blades becomes necessary, the wear plates have to be replaced with them at the same time, which represents a considerable waste of material.
  • a rotary drum of the type initially mentioned has also been developed in which separate lifting blades and separate wear plates are provided.
  • the wear plates have in their central area an aperture through which projects a correspondingly shaped portion of a lifting blade foot, so that when the lifting blade foot, which in this case is flat, is affixed to the internal drum wall, the corresponding wear plate is affixed at the same time.
  • thelifting blade can be replaced independently of the wear plates. Because of the flat shape of their feet, the lifting blades are largely independentof the diameter of the drum.
  • the invention is mainly directed to the problem of providing a rotary drum whereby the last-mentioned construction can be still further improved.
  • this problem is solved in that opposite each other under each blade foot and spaced apart are the ends of two wear plates which are adjacent each other in the peripheral direction of the drum, and in that at the underside of each blade foot there is provided a rib between the said plate ends, running generally parallel to the longitudinal axis of the drum and abutting against theinternal drum wall.
  • the lifting blades are in their shape and size largely independent of the diameter of the rotary drum being used, so that the stocking of spare lifting blades for a number of rotary drums of differing diameters is considerably simplified.
  • the rib For lifting blades whose longitudinal axis is generally parallel with the longitudinal axis of the drum, and which depending on their length have one or more projections on the blade foot it is desirable for the rib to extend over the whole length of the blade foot in the area of the central longitudinal plane thereof, the rib being made integral with the projection or projections.
  • a further beneficial form of the invention is produced when at its rear longitudinal side the foot of each lifting blade turns into a blade wall bent in the direction of rotation of the drum, said blade wall being immediately adjacent the blade scoop edge pointing in the direction of drum rotation, and when the scoop edge lies generally parallel with the lifting blade foot.
  • a lifting blade of this form can be made by the shell moulding process, wherein the metal model is covered with a plastic coating. As compared with the usual sand moulding process this produces greater surface hardness and greater dimensional accuracy, which are of particular advantage for the highly stressed scoop edge; in this method of manufacture the formation of shrinkage holes is also considerably reduced.
  • FIG. 1 is a cross-section through a rotary drum as provided by the invention, showing a lifting blade, and wear plates disposed therebelow;
  • FIG. 2 is a partly sectioned plan view of the lifting blade and wear plates of FIG. 1.
  • the rotary drum 1 of which only a small part is shown in cross-section in FIG. 1, rotates in the direction of arrow A about its longitudinal axis (not shown).
  • This rotary drum 1 is used especially for the heat treatment of material which has strongly erosive properties.
  • the internal drum wall 1a is provided with generally identically formed wear plates 2, 2, 2", 2" which lie against the internal drum wall and are matched to the internal diameter of rotary drum 1.
  • the internal drum wall la is also provided with a number of blades 3 (of which only one is shown, to simplify the representation) which are spaced at intervals in the peripheral direction of the drum 1 and are replaceably affixed to the internal drum wall la so that their scoop edges point in the direction of drum rotation (arrow A).
  • the lifting blades 3 have a straight flat foot 5, and by means of a reinforcing projection 6, 6' lie against the internal drum wall la.
  • the individual lifting blades 3 can for example be releasably affixed to the drum 1 with the aid of bolts (not shown).
  • each reinforcing projection 6, 6 has a corresponding bore 7.
  • the wear plates 2, 2', 2", 2" are provided with corresponding recesses 8, 8' through which project the projections 6, 6.
  • the fixation of the lifting blades 3 also provides fixation of the wear plates.
  • FIG. 2 is now considered, one may note that beneath each blade foot 5 lie opposite each other, and spaced apart by a distance a, the ends 2a, 2a of wear plates 2, 2' which are adjacent in the direction of the drum periphery, and that the apertures 8, 8' of the wear plates are open at the end. It is sufficient if these recesses 8, 8 are made merely deep enough for the wear plates to have sufficient lateral hold to prevent their displacement in the direction of the lifting blade longitudinal axis 9.
  • one or more reinforcing projections 6, 6 can be provided on the underside of the blade foot 5, and that in the longitudinal direction of the lifting blade 3 a number of wear plates can be affixed beneath each blade foot 5.
  • the lifting blade foot 5 has two reinforcing projections 6, 6', and the ends of a total of four wear plates 2, 2, 2" and 2" are affixed below the blade foot 5; the wear plates 2, 2" and 2', 2" which are adjacent in the longitudinal direction of blade 3 lie closely against each other, and each pair of ends (e.g. 2a and 2a) which are adjacent in the drum periphery direction have a corresponding reinforcing projection 6 or 6'.
  • each lifting blade foot there is also provided a rib 10 located between the two wear plate ends and running generally parallel to the longitudinal axis of the drum, the rib lying against the internal drum wall 1a.
  • This rib 10 prevents any fine material getting through below the blades 3 during operation of the drum 1, and travelling back against the general feed direction as the drum moves.
  • This rib extends over the entire length of the lifting blade foot 5 in the area of the longitudinal central plane thereof, and is integral with the reinforcing projections 6, 6'.
  • the wear plates 2, 2, 2" and 2" need only be loosely laid below the blade foot 5 to provide adequate attachment to drum wall la.
  • the other ends of the wear plates are naturally also fixed in like manner below corresponding lifting blades 3, adjacent to ends of other wear plates peripherally of the drum. 7
  • the foot 5 of the'lifting blade 3 at its rear longitudinal side becomes a blade wall 11, curved in the direction of drum rotation (arrow A), which is immediately connected to the scoop edge 4 of blade 3, pointing in the direction of drum rotation.
  • the scoop edge 4 thus lies generally parallel with the lifting blade foot 5.
  • the width of the scoop edge 4 is preferably about half the width of the blade foot 5, with the leading edges of scoop edge 4 and of blade foot 5, in the drum rotation direction, lying one vertically above the other.
  • the curved blade wall 11 acquires increased rigidity if its surface, as shown, has on the inside and outside integrally formed profilings 12.
  • the lifting blades 3 can be made with open sides. For effective operation and improved, life of the lifting blades 3 it will, however, generally be desirable that the blades be bounded byside walls l3, l3. To-improve their stability the lifting blades 3 can also have at least one reinforcing intermediate wall 14 between the side walls 13, 13.
  • a rotary drum for the heat treatment of strongly erosive material comprising a plurality of wear plates lining the internal drum wall, which are arranged around the circumference of the drum, and a plurality of lifting blades each of which is replaceably secured to the internal drum wall between the opposing ends of two adjacent wear plates, and each of which has a foot that extends above both adjacent wear plates to retain the wear plates in position and is provided with a rib that extends parallel to the drum axis and abuts against the internal drum wall between the adjacent wear plates, to prevent fine material from flowing backward under the lifting blade.
  • each lifting blade foot has at least one projection secured to the internal drum wall, with which the rib is integral, and which lies in two opposed recesses in the opposed edges of two wear plates.
  • a rotary drum according to claim 1 wherein a blade wall, curved in the direction of drum rotation, is formed integral with the trailing edge of each lifting blade foot and also integral with a scoop edge of the lifting blade, extending in the direction of drum rotation.
  • a rotary drum according to claim 5 wherein the leading sides of the scoop edge and the lifting blade foot lie substantially in the same radial plane, but the width of the scoop edge is only about half the width of the lifting blade foot, measured in the direction of drum rotation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Incineration Of Waste (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)
US00418887A 1973-04-09 1973-11-26 Rotary drum for the heat treatment of strongly erosive material Expired - Lifetime US3853458A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7313428 1973-04-09

Publications (1)

Publication Number Publication Date
US3853458A true US3853458A (en) 1974-12-10

Family

ID=6637959

Family Applications (1)

Application Number Title Priority Date Filing Date
US00418887A Expired - Lifetime US3853458A (en) 1973-04-09 1973-11-26 Rotary drum for the heat treatment of strongly erosive material

Country Status (7)

Country Link
US (1) US3853458A (OSRAM)
JP (1) JPS535859B2 (OSRAM)
BE (1) BE807002A (OSRAM)
ES (1) ES420985A1 (OSRAM)
FR (1) FR2225058A5 (OSRAM)
GB (1) GB1423300A (OSRAM)
SE (1) SE384260B (OSRAM)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910756A (en) * 1972-11-10 1975-10-07 Polysius Ag Heat treating drum
US4015929A (en) * 1975-01-23 1977-04-05 Leca Trading & Concession A/S Rotary kiln for producing an expanded clay product and a method of manufacturing the rotary kiln
US4207290A (en) * 1975-10-09 1980-06-10 Pfizer Inc. Flue gas scrubber
US4668183A (en) * 1984-11-29 1987-05-26 Gieberei Kohlscheid GmbH Lifting element for pipe coolers for material produced at least partially in lumps
US5033959A (en) * 1990-10-15 1991-07-23 J. O. Bernt & Associates Limited Kiln liner
US5040973A (en) * 1990-05-04 1991-08-20 Rollins Environmental Services (Tx) Inc. Rotary reactor and lifter assembly
US20100226200A1 (en) * 2009-03-04 2010-09-09 Dr. Herfeld Gmbh & Co. Kg Mixing Machine
US20100302898A1 (en) * 2009-05-26 2010-12-02 Dr. Herfeld Gmbh & Co. Kg Mixing Machine
US20150247101A1 (en) * 2014-03-03 2015-09-03 Aisaku Co., Ltd. Solid fuel manufacturing apparatus and method for manufacturing solid fuel
US9968897B2 (en) 2014-04-15 2018-05-15 Dr. Herfeld Gmbh & Co. Kg Mixing machine
US20220307205A1 (en) * 2021-03-25 2022-09-29 e5 Engineers, LLC Flight for Asphalt Rotary Dryer

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51146314U (OSRAM) * 1975-05-19 1976-11-24
ATE46762T1 (de) * 1986-03-18 1989-10-15 Kohlscheid Giesserei L-foermige hubschaufel fuer rohrkuehler.
JP2734802B2 (ja) * 1991-05-20 1998-04-02 ダイアホイルヘキスト株式会社 通気回転乾燥装置
JP3620311B2 (ja) * 1998-10-27 2005-02-16 スズキ株式会社 自動二輪車の収納装置
US6605383B1 (en) 2000-11-22 2003-08-12 Eveready Battery Company, Inc. Alkaline electrochemical cell having adhesive closure

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR871651A (fr) * 1939-07-12 1942-05-05 Metallgesellschaft Ag Versoir pour fours tubulaires rotatifs
DE1060775B (de) * 1956-01-18 1959-07-02 Theodor Horstkoetter Drehtrommel zur Waermebehandlung von Schuettgut, insbesondere Zementdrehrohrofen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR871651A (fr) * 1939-07-12 1942-05-05 Metallgesellschaft Ag Versoir pour fours tubulaires rotatifs
DE1060775B (de) * 1956-01-18 1959-07-02 Theodor Horstkoetter Drehtrommel zur Waermebehandlung von Schuettgut, insbesondere Zementdrehrohrofen

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910756A (en) * 1972-11-10 1975-10-07 Polysius Ag Heat treating drum
US4015929A (en) * 1975-01-23 1977-04-05 Leca Trading & Concession A/S Rotary kiln for producing an expanded clay product and a method of manufacturing the rotary kiln
US4207290A (en) * 1975-10-09 1980-06-10 Pfizer Inc. Flue gas scrubber
US4668183A (en) * 1984-11-29 1987-05-26 Gieberei Kohlscheid GmbH Lifting element for pipe coolers for material produced at least partially in lumps
US5040973A (en) * 1990-05-04 1991-08-20 Rollins Environmental Services (Tx) Inc. Rotary reactor and lifter assembly
US5033959A (en) * 1990-10-15 1991-07-23 J. O. Bernt & Associates Limited Kiln liner
US20100226200A1 (en) * 2009-03-04 2010-09-09 Dr. Herfeld Gmbh & Co. Kg Mixing Machine
US8678639B2 (en) 2009-03-04 2014-03-25 Dr. Herfeld Gmbh & Co. Kg Mixing machine
US20100302898A1 (en) * 2009-05-26 2010-12-02 Dr. Herfeld Gmbh & Co. Kg Mixing Machine
US8979354B2 (en) * 2009-05-26 2015-03-17 Dr. Herfeld Gmbh & Co. Kg Mixing machine
US20150247101A1 (en) * 2014-03-03 2015-09-03 Aisaku Co., Ltd. Solid fuel manufacturing apparatus and method for manufacturing solid fuel
US10557097B2 (en) * 2014-03-03 2020-02-11 Aisaku Co., Ltd. Solid fuel manufacturing apparatus and method for manufacturing solid fuel
US9968897B2 (en) 2014-04-15 2018-05-15 Dr. Herfeld Gmbh & Co. Kg Mixing machine
US20220307205A1 (en) * 2021-03-25 2022-09-29 e5 Engineers, LLC Flight for Asphalt Rotary Dryer
US12134864B2 (en) * 2021-03-25 2024-11-05 e5 Engineers, LLC Flight for asphalt rotary dryer

Also Published As

Publication number Publication date
JPS535859B2 (OSRAM) 1978-03-02
SE384260B (sv) 1976-04-26
GB1423300A (en) 1976-02-04
JPS508775A (OSRAM) 1975-01-29
FR2225058A5 (OSRAM) 1974-10-31
BE807002A (fr) 1974-03-01
ES420985A1 (es) 1976-04-16

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