EP1960110B1 - Dispositifs de levage de materiel - Google Patents

Dispositifs de levage de materiel Download PDF

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Publication number
EP1960110B1
EP1960110B1 EP06817589A EP06817589A EP1960110B1 EP 1960110 B1 EP1960110 B1 EP 1960110B1 EP 06817589 A EP06817589 A EP 06817589A EP 06817589 A EP06817589 A EP 06817589A EP 1960110 B1 EP1960110 B1 EP 1960110B1
Authority
EP
European Patent Office
Prior art keywords
ring
hook
lifting
wall
grinding
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.)
Not-in-force
Application number
EP06817589A
Other languages
German (de)
English (en)
Other versions
EP1960110A1 (fr
EP1960110A4 (fr
Inventor
James Sulzberger
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.)
Bradken Resources Pty Ltd
Original Assignee
Bradken Resources Pty Ltd
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
Priority claimed from AU2005906879A external-priority patent/AU2005906879A0/en
Application filed by Bradken Resources Pty Ltd filed Critical Bradken Resources Pty Ltd
Priority to PL06817589T priority Critical patent/PL1960110T3/pl
Publication of EP1960110A1 publication Critical patent/EP1960110A1/fr
Publication of EP1960110A4 publication Critical patent/EP1960110A4/fr
Application granted granted Critical
Publication of EP1960110B1 publication Critical patent/EP1960110B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/003—Shape or construction of discs or rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/12—Mills with at least two discs or rings and interposed balls or rollers mounted like ball or roller bearings

Definitions

  • the present invention relates to lifting arrangements and is especially applicable to systems for providing for safe lifting of large objects such as ring shaped objects requiring installation and removal from working positions.
  • one known type of grinding mill comprises upper and lower rings which confront each other and each has an annular recess of part spherical shape in cross-section with grinding balls located between the confronting recesses with an inverted upper ring resting via the grinding balls on top of the lower ring.
  • the lower ring when in use is supported on a table which rotates so that particulate feedstock is supplied generally vertically downwardly between the rings and migrates radially outwardly through the rings and grinding balls as it is pulverised.
  • the mill needs to be disassembled and in particular the lower ring removed and replaced.
  • Such rings are typically of white iron to provide resistance to wear.
  • the present invention is directed to new and useful alternatives for such applications.
  • the invention manifests itself in both methods of operation as well as specific new equipment designs to facilitate the lifting process.
  • the invention consists in An annular grinding mill ring having a radially inner wall, a radially outer wall and an annular recess between the walls for receiving grinding balls, the radially inner wall having a multiplicity of recesses spaced around the ring and extending into the wall of the ring for cooperation with lifting hooks and accessible at a location intermediate the axial ends of the grinding mill ring.
  • the hooks are generally j-shaped hooks having a main leg with an upper end portion when in normal orientation adapted for connection to a swivel and chain system and the opposite end of the j-shaped hook having a tip portion adapted to fit with a clearance into a recess.
  • the grinding mill ring may have its radially inner wall portion defined by surfaces which in use lie adjacent or contact portions of the j-shaped hook for each recess.
  • the arrangement may provide for a pure vertical lift from the hook ie. in a direction parallel to the axis of the ring despite lifting chains angling inwardly to an axially located central lifting point for each hook.
  • the interior wall portion of the grinding mill ring into which the recesses are located comprises an axially upper end portion which extends at a shallow angle to the axis of the ring to an intermediate location at a greater radial distance from the axis than the upper end.
  • Each recess may be arranged to extend extends into the ring from the intermediate location, and is defined between substantially parallel spaced walls substantially parallel to the angled upper end portion, the recess being directed upwardly.
  • the spaced wall spaced wall which is radially in wards leads to a tip having a substantially semi-circular profile which is adapted to be a loose fit with a complementary portion (between major and minor legs) of a j-shaped hook.
  • the recess may have an interior terminating wall also of substantially semicircular profile against which the free tip of the minor leg of the j-shaped hook in use engages for transmitting lifting load and is also a loose fit.
  • the grinding mill ring may be otherwise conventional in having a cylindrical wall in its lower portion extending around the axis of the ring and substantially fitting over a yoke table.
  • a yoke cover of disc shape may be supported on the yoke table with a spacing of around 50mm between the outer cylindrical edge of the yoke cover and the confronting wall of the inner surface of the grinding mill ring.
  • the yoke cover can have an upper surface lying substantially in the same plane as the.top of the grinding mill ring.
  • the invention does also manifest itself in a grinding mill having the structure described above in combination with a bottom ring as also described in any one of the forms above.
  • the invention also manifests itself in a methodology of operating a grinding mill in which a generally j-shape hook is used in each of a multiplicity of circumferentially spaced recesses in a bottom ring as described in any one of the forms above, each such hook being dimensioned to have a height less than the distance between the top of the yoke cover and the yoke table so that when lifting forces are released each hook drops down to be supported on the yoke table, the hook is a loose fit in the recess and the hook having a screw-threadably attached swivel for lifting chains, the methodology being characterised by, after installing the bottom ring, unscrewing the swivels and removing them thereby leaving a screw threaded blind bore in each hook adapted to receive and secure a cover arrangement to prevent the ingress of material to be ground into a zone occupied by the hook. Removal of the ring can then be achieved by re-attaching the swivel and chain to each hook and lifting.
  • the invention manifests itself in a hook for use with a lower ring of grinding mill and in any one of the forms as described herein and the grinding mill having structure for supporting the lower ring and including a yoke table supporting a yoke cover with an annular gap between the radially outer edge of the yoke cover and the radially inner wall portion of the grinding mill ring, the hook having height less than the axial distance between the top of the yoke table and the yoke cover, the hook being generally j-shaped with a top wall having a blind, screw-threaded bore for receiving a swivel to which a lifting chain is attached and the hook having major and minor legs joined by a base portion having a base wall for supporting the hook on a yoke table.
  • the major leg may have a surface extending at a shallow angle to the axial direction when in use and for contacting or lying adjacent the complementary surface of the bottom ring and the minor leg has a corresponding surface facing away from the major leg and also at a similar shallow angle to the axial direction when in use whereby the hook is adapted for provide a vertical lift of the ring with lifting chains angled radially inwardly eg at around 20° to the axial direction.
  • the j-shaped hook may have a substantially semicircular tip surface for engaging for lifting the end wall of the recess of the ring but in a loose fit and also the base portion of the j-shaped hook may have a curved surface defining a space between the legs of the hook and defining a recess for accommodating in a loose fit a corresponding curved dip portion of the bottom ring.
  • the present invention provides a lifting hook for use with or when used in conjunction with a grinding mill ring according to the first aspect of the invention.
  • FIG. 1 a known type of grinding arrangement used in a grinding mill for grinding coal is illustrated.
  • the main components are a rotatable yoke table 2 supporting a lower grinding ring 10 with grinding balls 3 located in an annular trough 12 in the ring and supporting an upper complementary grinding ring 4.
  • a yoke cover 5 of disc shape is mounted on the yoke table and provides a horizontal surface at the same height as the upper rim of lower ring 10 and onto which particulate material to be ground is dropped in use.
  • the coal migrates radially outwardly between the rings and is ground by the grinding balls into a pulverised form for discharge.
  • the lower grinding mill ring 10 is usually made of white iron and is highly resistant to abrasion. However, periodically it will need replacement and the machine must then to be disassembled and the lower ring removed using lifting tackle.
  • the ring is typically 3.5m in diameter and over 7,000kg in weight and must be handled safely and reliably. Thus, readily engagable fixing arrangements are needed and recesses 14 are provided about the periphery of the ring 100 for the purpose of engaging lifting hooks to lift the ring.
  • FIG 2 a modified grinding arrangement is shown at the time of installing a modified lower grinding ring 100 and identical reference numerals to figure 1 will be used to indicate identical components.
  • three recesses 20, only one of which is visible in figure 2 are provided spaced about the inner portion of grinding ring 100.
  • One of hooks 22 (only one of which is visible) engage with each recess 20.
  • Each hook 22 includes a blind threaded bore 23 which receives a threaded swivel 24. Swivel 24 affixes to lifting chain 26 in a known fashion.
  • each of swivels 24 is disconnected from each hook 22 (see figure 3 ).
  • a small clearance is provided underneath hook when installed to allow it to drop down a small distance to rest upon yoke table 2. This ensures the hook 22 is not under load after installation and does not interfere with correct alignment of mill parts, or obstruct material being ground in the mill.
  • Recess 20 and hook 22 are shaped to maintain hook 22 in a generally vertical orientation during lifting.
  • a lifting force F applied to lifting chain 26 is made up of a horizontal component H and a vertical component V.
  • the tendency for the hook to rotate in a clockwise direction as a result of the horizontal component of the force is resisted by abutment of hook 22 with recess 20 at contact points A and B.
  • This interaction of hook 22 and recess 20 resists rotation of the hook and avoids the upper part of hook fouling against yoke plate 5 during installation or removal.
  • Hooks 22 remain in place in recesses 20 for the useful life of the grinding ring 100.
  • Plugs to prevent ingress or particles may be installed in the threaded bores 23 of the locks 22, and/or a cover ring may be installed over the zone between the yoke cover 5 and the lower ring 100.
  • Removal of grinding plate 100 such as for the purpose of replacing a worn grinding plate 100 is a reversal of installation. Swivels are re-attached to each of hooks 22 and the swivels are attached to lifting chains. Upon lifting, each of hooks 22 engage with recesses 20 and the ring 100 is lifted out of position.
  • Each hook 22 has a main limb 30 having an upper end into which a threaded lined bore 23 is provided and around an axis 31.
  • the main limb is of substantially rectangular of sectional shape with its outer and inner side faces 31 and 32 parallel to the axis 31.
  • the main limb 30 has a lower portion 33 with inner and outer side faces which are inclined at about 15° to the axis 31 and towards a curved tip portion 34.
  • the hook has a base portion 35 providing a flat base surface 36 at right angles to the axis 31 with curved corners joining the flat base 36 to the inclined lower outer surface 37 and an inner surface 38.
  • An aperture 39 is defined between the lower portion of the inner surface 32 and a confronting surface 40 of the tip 34.
  • the tip terminates in a pan cylindrical upper surface 41 which leads to an outer face 42 of the tip and which is inclined at about 11° to the axis 31.
  • the recess 39 is shown in more detail in figure 7 . It is designed to provide a convenient clearance fit with a complementary curved projection 50 at the periphery of the lower ring 100, the curved projection being of part cylindrical form. As illustrated in figure 7 the curved recess 39 is formed with a smooth joining of two different radius portions as indicated with lateral and vertical spacing to obtain the desired fit.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Crushing And Grinding (AREA)

Claims (11)

  1. Bague annulaire de broyage (100) munie d'une paroi radialement intérieure, d'une paroi radialement extérieure et, entre lesdites parois, d'un évidement annulaire (20) dédié à la réception de boulets broyeurs (3), ladite paroi radialement intérieure comprenant une multiplicité d'évidements (20) espacés autour de la bague, pénétrant dans la paroi de ladite bague (100) en vue d'une coopération avec des crochets de levage (22), et accessibles en un emplacement intermédiaire entre les extrémités axiales de ladite bague de broyage (100).
  2. Bague de broyage selon la revendication 1, la paroi radialement intérieure de ladite bague de broyage (100), dans laquelle les évidements (20) sont pratiqués, comprenant une région extrême axialement supérieure qui s'étend selon un angle faiblement accentué, vis-à-vis de l'axe de ladite bague, jusqu'à un emplacement intermédiaire davantage éloigné dudit axe, dans le sens radial, que l'extrémité supérieure.
  3. Bague de broyage selon la revendication 2, chaque évidement (20) pénétrant dans ladite bague (100) à partir de l'emplacement intermédiaire et étant défini entre des parois espacées sensiblement parallèles, en substance parallèlement à la région extrême supérieure inclinée, ledit évidement (20) étant dirigé vers le haut.
  4. Bague de broyage selon la revendication 3, dans laquelle la paroi espacée, radialement intérieure, fusionne dans un mentonnet (50) à profil pour l'essentiel semi-circulaire destiné à s'ajuster, avec jeu, sur une partie complémentaire (entre des branches principale et secondaire) d'un crochet de configuration en J.
  5. Crochet de levage (22) utilisé en association avec une bague de broyage (100) conforme à la revendication 1.
  6. Crochet de levage (22) conçu pour être utilisé en association avec une bague de broyage conforme à la revendication 1, et présentant une configuration générale en J comprenant un jambage principal (30), une base et un bout incurvé (34), ledit crochet comportant un trou taraudé pénétrant dans une surface supérieure dudit jambage principal (30), en vue du rattachement à un émerillon de levage (24), et s'étendant autour d'un axe dudit jambage principal (30) dudit crochet (22) de configuration en J, lequel crochet est pourvu, sur le bout incurvé dudit crochet , d'une surface latérale dévolue à la coopération avec des faces correspondantes d'un évidement de bague de broyage (100), et ledit crochet (22) étant logé avec jeu dans ledit évidement, le bout incurvé (34) et l'évidement (20) étant dotés, chacun, d'une configuration sensiblement circulaire en coupe transversale.
  7. Crochet de levage selon la revendication 6, offrant un dimensionnement axial moindre que l'épaisseur de la bague (100), de sorte que, lors d'un désengagement de moyens de levage (24, 26), ledit crochet (22) peut descendre pour venir prendre appui sur un plateau d'embase (2), et être laissé en place durant une période de service du broyeur.
  8. Crochet de levage selon la revendication 7, dans lequel la base (36) est aplatie en vue de l'appui dudit crochet (22) sur le plateau d'embase (2).
  9. Crochet de levage selon l'une quelconque des revendications 6-8, dans lequel, pour occuper une position adjacente à une région axialement médiane d'une paroi de la bague de broyage (100) qui pointe radialement vers l'intérieur, le côté du jambage principal (30) décrit un angle faiblement accentué par rapport à la direction axiale, de manière à compléter un angle correspondant sur la paroi radialement intérieure.
  10. Crochet de levage selon quelconque des revendications 6-8, dans lequel le bout incurvé (34) présente des faces latérales sensiblement parallèles l'une à l'autre et inclinées, en direction du jambage principal (30), selon un angle faiblement accentué vis-à-vis de l'axe (31).
  11. Procédé de manipulation d'une bague annulaire de broyage revêtant la forme d'une bague de broyage (100) conforme à l'une quelconque des revendications 1-4, consistant à utiliser, dans chaque évidement (20), un crochet de levage (22) conforme à l'une quelconque des revendications 6-10 ; à mettre en place un émerillon (24) et une chaîne de levage (26) dans chaque crochet (22); à soulever ladite bague (100) ; et, à l'issue du dépôt sur un plateau d'embase (2), à enlever ledit émerillon (24) et ladite chaîne (26) en vue d'une période de service.
EP06817589A 2005-12-07 2006-12-06 Dispositifs de levage de materiel Not-in-force EP1960110B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06817589T PL1960110T3 (pl) 2005-12-07 2006-12-06 Układ do wyposażenia podnośnikowego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005906879A AU2005906879A0 (en) 2005-12-07 Lifting hooks for grinding mills
PCT/AU2006/001853 WO2007065214A1 (fr) 2005-12-07 2006-12-06 Dispositifs de levage de materiel

Publications (3)

Publication Number Publication Date
EP1960110A1 EP1960110A1 (fr) 2008-08-27
EP1960110A4 EP1960110A4 (fr) 2009-06-17
EP1960110B1 true EP1960110B1 (fr) 2011-01-26

Family

ID=38122409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06817589A Not-in-force EP1960110B1 (fr) 2005-12-07 2006-12-06 Dispositifs de levage de materiel

Country Status (6)

Country Link
EP (1) EP1960110B1 (fr)
AT (1) ATE496699T1 (fr)
DE (1) DE602006019908D1 (fr)
PL (1) PL1960110T3 (fr)
WO (1) WO2007065214A1 (fr)
ZA (1) ZA200803449B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2453107B (en) * 2007-09-25 2012-08-01 Bradken Uk Ltd Annular grinding ring
GB2451299B (en) * 2007-10-05 2009-07-22 Internat Innovative Technologi Multi-sectional roller mill
RU2496582C1 (ru) * 2012-06-18 2013-10-27 Игорь Феликсович Шлегель Устройство для измельчения и активации материалов
PL237306B1 (pl) * 2018-03-27 2021-04-06 Fpm Spolka Akcyjna Układ regulowanego pierścienia dyszowego
PL237305B1 (pl) * 2018-03-27 2021-04-06 Fpm Spolka Akcyjna Sposób łączenia pierścienia miażdżącego i pierścienia dyszowego oraz połączenie pierścienia miażdżącego i pierścienia dyszowego

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1522407A (en) * 1924-02-11 1925-01-06 Barkhurst Raymond Ore mill
GB847281A (en) * 1957-12-06 1960-09-07 Babcock & Wilcox Ltd Improvements in pulverising mills
US3044714A (en) * 1958-11-26 1962-07-17 Babcock & Wilcox Ltd Ball race pulverizer
DE4423930C2 (de) * 1994-07-07 1999-08-19 Babcock Kraftwerkstech Gmbh Vorrichtung zum Warten einer Mühle

Also Published As

Publication number Publication date
PL1960110T3 (pl) 2011-06-30
ZA200803449B (en) 2009-11-25
EP1960110A1 (fr) 2008-08-27
EP1960110A4 (fr) 2009-06-17
ATE496699T1 (de) 2011-02-15
WO2007065214A1 (fr) 2007-06-14
DE602006019908D1 (de) 2011-03-10

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