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EP0722365A1 - Broyeurs a mineraux - Google Patents

Broyeurs a mineraux

Info

Publication number
EP0722365A1
EP0722365A1 EP94929055A EP94929055A EP0722365A1 EP 0722365 A1 EP0722365 A1 EP 0722365A1 EP 94929055 A EP94929055 A EP 94929055A EP 94929055 A EP94929055 A EP 94929055A EP 0722365 A1 EP0722365 A1 EP 0722365A1
Authority
EP
European Patent Office
Prior art keywords
assembly
tip
tip assembly
cam
rotor assembly
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.)
Granted
Application number
EP94929055A
Other languages
German (de)
English (en)
Other versions
EP0722365A4 (fr
EP0722365B1 (fr
Inventor
Timothy George Collins
Ian Gordon Rodger
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.)
Metso Minerals New Zealand Ltd
Original Assignee
Metso Minerals New Zealand Ltd
Tidco International 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
Application filed by Metso Minerals New Zealand Ltd, Tidco International Ltd filed Critical Metso Minerals New Zealand Ltd
Publication of EP0722365A1 publication Critical patent/EP0722365A1/fr
Publication of EP0722365A4 publication Critical patent/EP0722365A4/fr
Application granted granted Critical
Publication of EP0722365B1 publication Critical patent/EP0722365B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
    • B02C13/1842—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc with dead bed protected beater or impeller elements

Definitions

  • This invention relates to modifications to mineral breakers.
  • Centrifugal mineral breakers have mineral material (such as rocks) fed axially into a rotor assembly which is revolving at high speed. Rocks are also fed into the mineral breaker so that they fall in a stream outside the rotor assembly. The rocks within the rotor assembly are flung outwardly so that they impact upon the rock stream. This impact shatters the rocks into smaller sizes.
  • the material holding the tungsten carbide still wears away (along with the tungsten) and the tip assembly and tip is required to be replaced regularly.
  • the mineral breaker can suffer serious damage if there is no tip assembly in the proximity of the discharge port. This can happen if the tip assembly wears through or breaks off due to impact or erosion wear.
  • a backup tip of similar construction may be included in the tip assembly. This backup will give some protection to the rotor assembly until the tip can be replaced.
  • Coarse materials have typically caused premature failure of conventional tip assemblies. This is because the tip assembly is unable to resist wear and impact of the larger rocks and further unable to retain the larger sized rocks in the rock lining of the rotor.
  • US Patent No. 4940188 discloses an attempt to address the above problem by providing an increased volume of space behind the tip assembly which allows the rock lining or wave to be more firmly held in place by the tip assembly and to hold larger rocks therein. In some cases, a large rock can overhang the tungsten and provide the wear surface itself. However, there are still problems with this configuration and a greater volume available would also be desirable.
  • This prior art assembly also only allows a single mounting system involving bolts to be utilised which again extend into the rock wave. This makes it difficult to access the bolts when it is desired to replace the tip assembly. Excessive wear also occurs at the bolt positions.
  • Slip streaming is a phenomenon which occurs when water and fine particles of dust and grit from the rocks are accelerated within the rotor and as it exits the rotor assembly. Because of the size of the particles, they find their way into various cracks, small gaps and so forth in the rotor assembly causing considerable wear to the rotor and the tip assemblies. With conventional tip assembly designs, the slip steaming would wear the ends of the tip assembly as they did not fully meet with the inside surfaces of the top and bottom rotor assembly plates.
  • a rotor assembly for a centrifugal mineral breaker characterised in that the rotor assembly has at least one inset on the inner surface of either its top or bottom plates, said inset being capable of receiving either the top and bottom side of a tip assembly.
  • the inner surface referred to may in some embodiments be an additional plate attached to the actual top or bottom plates of the rotor assembly.
  • this plate may be a wear plate.
  • the insets are shaped so as to allow the easy removal of a tip assembly therefrom.
  • the insets are substantially curved in shape allowing for easy insertion of the tip assemblies. This curvature preferably also minimises the gap between the tip and edge of the inset for the tip in any position and allows for minimum metal removal on manufacture.
  • the rock wave which builds up within the rotor housing varies according to the type of rock, the size of the rock falling within and the configuration of the rock (say sharp or rounded).
  • the rock wave which is built up should cover all of the vulnerable parts of the rotor assembly not protected by additional wear parts leaving only the leading edge of the tip (which is mainly tungsten carbide) exposed to the wear of the rock exiting the rotor.
  • the tip which is mainly tungsten carbide
  • the angle of the tip holder with respect to the rotor housing, the differing rock waves can be accommodated.
  • the angle of the tip holder shall be that the majority of wear will occur across the face of the tungsten and not the edge.
  • the present invention can also allow for the tip assembly to be positioned at different angles with respect to the rotor assembly. For example, if a substantially curved path is provided on the inset, the tip assembly can be positioned at any portion of the curved part provided it can be secured there by some other means.
  • a method of altering the angle of a tip assembly with respect to a rotor assembly of a centrifugal mineral breaker characterised by the step of providing a pivot point about which the tip assembly can rotate. It can be seen that by having a pivot point, the angle of the tip assembly can be changed which is facilitated in one embodiment by the additional step of locating the tip assembly within an inset of the rotor assembly.
  • the means by which the tip assembly is held at the desired angle can be achieved by a variety of means.
  • the pivot may be a cog which can interact with various parts of the tip assembly, the teeth on the cog serving to hold the tip assembly into place.
  • a smooth pivot with a cam which operates as a stop preventing movement of the tip assembly past a pre-defined point.
  • This can come in a variety of forms, for example a fixed wedge or block.
  • a preferred means of providing a stop is to have an eccentric cam situated within the rotor housing.
  • the cam may be rotatable about a pivot while capable of bearing against the base of the tip assembly (preferably the base of the tip assembly). Rotation of the cam can push the tip assembly until the tip assembly reaches the desired angle. Preferably this action is along the path set by the insets. The cam can then be locked in position such that it cannot rotate.
  • the tip assembly may be capable of moving forwards into the rotor housing when the mineral breaker is not in operation. However, once the mineral breaker is in operation the force of the rocks exiting the rotor assembly will push the tip assembly outwards to the desired angle which in some embodiments is governed by the force of the cam against the base of the tip assembly.
  • the present invention has a number of advantages over the prior art.
  • One major advantage of the present invention is that considerably less material is used than in conventional tip constructions, as there is no additional material required to extend into the rock wave to secure the tip assembly. This provides advantages in the management of the rock wave. Less material in front of the tip assembly means a greater volume of space behind the tip is available for the rock wave to be more firmly held in place and for larger rocks to be held within. This leads to less wear on the tip assembly.
  • a further advantage of not having the attachment means extending into the rock wave is that the tip assembly can be more readily removed from the rotor assembly. Bolts are not required, which again can make it easier to detach the tip assembly from the rotor.
  • Yet another advantage of the present invention is that the top and bottom sides of the tip assembly cannot be worn away by slip streaming as they are contained within the paths. That is, there is now no gap between the ends of the tip assembly and the rotor assembly which has been vulnerable to slip streaming.
  • the present invention offers a number of advantages. Firstly, there is greater volume provided to aid in the securing of the rock wave. Secondly there is provided a relatively easy means by which the angle of the tip assembly can be altered to accommodate the parameters of the rock wave. Thirdly, problems associated with slip streaming have been reduced.
  • Figure 1 is a diagrammatic cross-sectional view of one embodiment of the present invention.
  • Figure 2 is a diagrammatic perspective view of the above embodiment.
  • the plate 2 has an inset 3 which provides a substantially curved path for the tip assembly 4 to slide along.
  • the tip assembly 4 is shown to be a single tip with no back up tip, however it should be appreciated that the present invention can be used in relation to tip assemblies having other configurations.
  • the tip assembly 4 is connected to a pivot 5 which can slot into an appropriate inset (not shown) in the rotor housing 2.
  • An eccentric cam 6 is bolted via bolt 7 to a plate 8 within the rotor housing. Rotation of the cam 6 can be restricted or permitted by the bolt of which holds the cam 6 with respect to the rotor assembly 1. For example, rotation of the cam 6 around the bolt 7 can be achieved by loosening off the bolt 7. Likewise tightening the bolt 7 restricts rotation of the cam 6.
  • the linkage block 9 acts to transfer force from rotation of the eccentric cam 6 to the tip assembly 4. It is envisaged that the linkage block 9 is a semi-permanent part of the rotor assembly 1 which is not replaced along with the tip assembly 4. In some embodiments the linkage block may act as a backup tip.
  • the top arrow in Figure 1 illustrates the effect of the direction of the force that the rocks exiting the discharge port of the rotor applies to the tip assembly 4.
  • the bottom arrow on Figure 1 illustrates the force that the cam 6 exerts against the linkage block 9 and hence the inside face of the tip assembly 4 below the pivot point 5.
  • the cam 6 acts as a counter to the force of the rocks exiting the rotor assembly 1.
  • the most outward position of the tip assembly 4 is governed by the cam 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

Ensemble rotor pour broyeur à minéraux centrifuge. Il est caractérisé en ce qu'il possède au moins une concavité ménagée dans la surface de sa plaque supérieure et adaptée pour accueillir la face supérieure ou inférieure d'un ensemble emboîtable.
EP94929055A 1993-10-14 1994-10-12 Broyeurs a mineraux Expired - Lifetime EP0722365B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NZ24895393 1993-10-14
NZ24895393 1993-10-14
PCT/NZ1994/000105 WO1995010358A1 (fr) 1993-10-14 1994-10-12 Modifications des broyeurs a mineraux

Publications (3)

Publication Number Publication Date
EP0722365A1 true EP0722365A1 (fr) 1996-07-24
EP0722365A4 EP0722365A4 (fr) 1997-01-08
EP0722365B1 EP0722365B1 (fr) 2000-03-29

Family

ID=19924527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94929055A Expired - Lifetime EP0722365B1 (fr) 1993-10-14 1994-10-12 Broyeurs a mineraux

Country Status (5)

Country Link
EP (1) EP0722365B1 (fr)
AU (1) AU679124B2 (fr)
DE (1) DE69423769T2 (fr)
WO (1) WO1995010358A1 (fr)
ZA (1) ZA948035B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5860605A (en) 1996-10-11 1999-01-19 Johannes Petrus Andreas Josephus Van Der Zanden Method and device for synchronously making material collide
NZ328062A (en) 1997-06-11 1999-10-28 Svedala Barmac Ltd Rotary mineral breakers having a contoured bed and weir
NZ328061A (en) 1997-06-11 1998-11-25 Svedala Barmac Ltd Rotary mineral crusher with focused output of the rotor includes a tip component engageable via a holder to define a transverse weir that is not symmetrical in a plane transverse to the radial direction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796822A (en) * 1983-11-18 1989-01-10 Acrowood Corporation Impeller for an impact crusher
US4844364A (en) * 1988-06-06 1989-07-04 Rossouw Pieter J Rotary impact crusher
NZ231457A (en) * 1989-11-21 1993-02-25 Tidco Group Ltd Rotor for mineral breaker with detachable top plate that protects internal surfaces

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9510358A1 *

Also Published As

Publication number Publication date
ZA948035B (en) 1995-08-17
WO1995010358A1 (fr) 1995-04-20
DE69423769D1 (de) 2000-05-04
EP0722365A4 (fr) 1997-01-08
EP0722365B1 (fr) 2000-03-29
AU679124B2 (en) 1997-06-19
DE69423769T2 (de) 2000-11-02
AU7824794A (en) 1995-05-04

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