US3555329A - Gearless drive for cement mill - Google Patents

Gearless drive for cement mill Download PDF

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Publication number
US3555329A
US3555329A US819030A US3555329DA US3555329A US 3555329 A US3555329 A US 3555329A US 819030 A US819030 A US 819030A US 3555329D A US3555329D A US 3555329DA US 3555329 A US3555329 A US 3555329A
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US
United States
Prior art keywords
drum
pole wheel
studs
rotor
elastic
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
US819030A
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English (en)
Inventor
Eugen Meyer
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.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
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BBC Brown Boveri France SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
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Publication of US3555329A publication Critical patent/US3555329A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/24—Driving mechanisms

Definitions

  • Elastic members located between each side of each stud and the corresponding end of the recess provide a resilient drive for the drum by the pole wheel, and expansions and contractions of the drum due to changes in temperature are accommodated by sliding movement of the studs in their recesses thus preventing deformations of the drum caused by heat from exerting any forces upon the pole wheel.
  • This invention relates to an improved gearless drive for cement mills and the like, and more particularly to a gearless drive of the type wherein the pole wheel rotor of a low-speed electric motor surrounds and is: secured to the mill drum and is surrounded by the stator element of the motor.
  • the drum as a shaft for the pole wheel, that is the rotor element of themotor, and to locate the stator around the mill.
  • the drum can increase to a temperature which is 100 C. hotter than the pole wheel.
  • temperature differences of about 50 C. may appear on the circumference of the drum. Consequently, deformations appear which are transmitted to the pole wheel and which would reach to a considerable overall strain in cases of drums which have a-diarneter of several meters.
  • the object of the present invention is to provide an improved electric motor powered gearless drive for the drum of a cement mill, the motor being of the low-speed type and whose pole wheel i.e. rotor and stator elements surround the drum, and which includes an elastic connection between the pole wheel and drum which is very simple, rugged and reliable from a structural point of view, but which does not transmit to the pole wheel rim any deformations of the drum caused by thermal expansions and contractions in radial and tangential directions.
  • the interconnections between the pole wheel and drum as a circumferentially extending array of studs which project radially'frorn the drum and engage in correspondingly located recesses in the rim of the pole wheel, thestuds being elastically supported in the recewes by means of elastic elements located between the opposite ends of the recesses, as measured in a circumferential direction, and the opposite sides of the studs.
  • FIG. 1 shows a part of the drive in axial section
  • FIG. 2 is a fragmentary view'showing a portion of the rim of the pole wheel as viewed in the axial direction of the drum;
  • FIG. 3 is a view in perspective of one of the elastic elements interposed between the pole wheel and the mill drum.
  • a fragment of the drum of a cement mill is'indicated at 1, and'thisisdrivendirectly by means of a low-speed, alternating current electric motor, the stator of the motor being indicated at 2, and the rotor or pole wheel being indicated at 3.
  • a ring 4 encircles the drum and is welded thereto, and to this ring is secured arim portion 5 by means of a plurality of circumferentially spaced bolts 4a.
  • each elastic drive assembly includes a pair of like, beam-type elastic members 9, shown in detail in FIG. 3, arranged front-to-front, with their outer end portions 9a in contact with each other and with their intermediate portions 9b spaced slightly apart to establish the desired elastic or spring action in a circumferential direction when the pole wheel drives the drum.
  • Positive stop projections are located at the opposite ends of each recess 7 and these have a rounded end which engage with a flat middle portion of the adjacent elastic member 9.
  • a plate 11 made of an abrasion-resistant material such as bronze secured to each side of the projection 6 has rounded end which engages a flat middle portion of the adjacent elastic member 9.
  • the plates 11 enhance the ability of the studs to slide radially with respect to the elastic members 9, i.e. radially with respect to the pole wheel 3 as the mill drum expands or contracts.
  • each recess may be walled off by means of side plates 12 which are shown in FIG. 1.
  • the elastic members 9 of each pair are prestresscd by means of a suitable clamping arrangement in the direction towards one another, andthe dimensions of the members 9 between their center parts 9b are so chosen that in case of a short circuit of the machine, the center parts 9b actually touch each other and thus transmit the short circuit torque directly. Due to the special form, a unifonn distribution of the load is achieved at the same time.
  • the improved interconnection between the drum and pole wheel of the electric motor, in accordance with the invention is thus extremely simple, space saving and requires no attention.
  • the individual elastic elements can adapt themselves readily to the unequal forces which are caused by temperature differences on the drum shell, and the thermal expansions in a radial direction are absorbed by the.sliding movement of the studs in the recesses, so that transmission of any deformation of the drum to the pole wheel of the motor is positively prevented.
  • a gearless drive for the drum of a cement mill or the like comprising a low-speedelectric motor surrounding said drum, said motor being constituted by an outer stationary stator and an inner rotor of the pole wheel type, and means interconnecting said drum and rotor which include a circumferential array of uniformly spaced studs structurally united with said drum and which project in a radially outward direction therefrom, a corresponding array of uniformly spaced recesses located on said rotor in which said-studs are received, and elastic means located between each side of each stud and the corresponding end of the recess for providing a driving connection between said rotor and drum, said elastic means at each side of each stud beingconstituted by a pair of like elastic members arranged in front-to-front relation, the outer end portions of said elastic members being in contact with each other and the intermediate portions thereof being spaced slightly from each other to establish a driving elasticity in the circumferential direction, and said studs being free to shift radially in said as defined in claim 1 and which further

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Crushing And Grinding (AREA)
US819030A 1968-05-27 1969-04-24 Gearless drive for cement mill Expired - Lifetime US3555329A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH780668A CH482470A (de) 1968-05-27 1968-05-27 Getriebeloser Zementmühlen-Antrieb

Publications (1)

Publication Number Publication Date
US3555329A true US3555329A (en) 1971-01-12

Family

ID=4330747

Family Applications (1)

Application Number Title Priority Date Filing Date
US819030A Expired - Lifetime US3555329A (en) 1968-05-27 1969-04-24 Gearless drive for cement mill

Country Status (9)

Country Link
US (1) US3555329A (no)
JP (1) JPS4844540B1 (no)
AT (1) AT276033B (no)
CH (1) CH482470A (no)
DE (2) DE1919500A1 (no)
FR (1) FR2011869A1 (no)
GB (1) GB1225911A (no)
NO (1) NO123925B (no)
SE (1) SE335903B (no)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283648A (en) * 1978-07-04 1981-08-11 Siemens Aktiengesellschaft Synchronous electric machine with salient poles in the rotor
EP1243337A3 (de) * 2001-03-23 2003-05-07 KHD Humboldt Wedag AG Antriebseinrichtung für eine Rohrmühle
EP2624416A1 (en) * 2012-02-01 2013-08-07 GE Energy Power Conversion Technology Limited A gearless drive for a rotating electrical machine
RU2505359C2 (ru) * 2009-08-12 2014-01-27 Флуор Текнолоджис Корпорэйшн Конструкции футеровки для дробилки с безредукторным двигательным приводом и способы ее изготовления
EP2692446A1 (en) 2012-08-03 2014-02-05 GE Energy Power Conversion Technology Ltd Rotary drum apparatus comprising a rotary drum and at least one electric motor for driving the drum, with a stator extending against a part of circumference of the drum
US10298080B2 (en) 2012-01-20 2019-05-21 Fluor Technologies Corporation Rotor pole support ribs in gearless drives

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540259C2 (de) * 1975-09-10 1982-05-13 Zahnräderfabrik Renk AG, 8900 Augsburg Planetenrädergetriebe, insbesondere für den Antrieb von Zementmühlen
DE102019208248A1 (de) * 2019-06-06 2020-12-10 Thyssenkrupp Ag Mahleinrichtung zum Mahlen von körnigem Gut
WO2021124345A1 (en) * 2019-12-18 2021-06-24 Permanent Magnets Limited Magnetic core assembly and manufacturing process thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078680B (de) * 1958-02-28 1960-03-31 Siemens Ag Einrichtung zur federnden Aufhaengung des Blechpaketes elektrischer Maschinen
DE1196779B (de) * 1962-09-28 1965-07-15 Allis Chalmers Mfg Co Verspannung der Einzelbleche ausgepraegter Pole fuer das Polrad elektrischer Maschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078680B (de) * 1958-02-28 1960-03-31 Siemens Ag Einrichtung zur federnden Aufhaengung des Blechpaketes elektrischer Maschinen
DE1196779B (de) * 1962-09-28 1965-07-15 Allis Chalmers Mfg Co Verspannung der Einzelbleche ausgepraegter Pole fuer das Polrad elektrischer Maschinen

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283648A (en) * 1978-07-04 1981-08-11 Siemens Aktiengesellschaft Synchronous electric machine with salient poles in the rotor
EP1243337A3 (de) * 2001-03-23 2003-05-07 KHD Humboldt Wedag AG Antriebseinrichtung für eine Rohrmühle
RU2505359C2 (ru) * 2009-08-12 2014-01-27 Флуор Текнолоджис Корпорэйшн Конструкции футеровки для дробилки с безредукторным двигательным приводом и способы ее изготовления
US10298080B2 (en) 2012-01-20 2019-05-21 Fluor Technologies Corporation Rotor pole support ribs in gearless drives
EP2624416A1 (en) * 2012-02-01 2013-08-07 GE Energy Power Conversion Technology Limited A gearless drive for a rotating electrical machine
WO2013113803A1 (en) * 2012-02-01 2013-08-08 Ge Energy Power Conversion Technology Ltd A gearless drive for a rotating electrical machine
CN104247217A (zh) * 2012-02-01 2014-12-24 通用电气能源能量变换技术有限公司 用于旋转电气机器的无齿轮驱动
CN104247217B (zh) * 2012-02-01 2017-06-20 通用电气能源能量变换技术有限公司 用于旋转电气机器的无齿轮驱动
EP2692446A1 (en) 2012-08-03 2014-02-05 GE Energy Power Conversion Technology Ltd Rotary drum apparatus comprising a rotary drum and at least one electric motor for driving the drum, with a stator extending against a part of circumference of the drum
US9387481B2 (en) 2012-08-03 2016-07-12 Ge Energy Power Conversion Technology Limited Rotary drum apparatus comprising a rotary drum and at least one electric motor for driving the drum, with a stator extending against a part of circumference of the drum

Also Published As

Publication number Publication date
DE6915375U (de) 1970-10-15
NO123925B (no) 1972-02-07
SE335903B (no) 1971-06-14
GB1225911A (no) 1971-03-24
DE1919500A1 (de) 1970-05-14
CH482470A (de) 1969-12-15
FR2011869A1 (no) 1970-03-13
JPS4844540B1 (no) 1973-12-25
AT276033B (de) 1969-11-10

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