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
• • 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
  • B02C13/26—Details
  • B02C13/28—Shape or construction of beater elements

Definitions

• the present invention relates to an ejector with one or more pockets, intended for crushers of the centrifugal type with vertical axis (so-called VSI crushers).
• centrifugal type crushers are known in the state of the art for crushing all kinds of materials, in particular rock aggregates.
• centrifugal crushers include a cylindrical tank in which is disposed a rotary table which is supported by a vertical bearing and which comprises means for rotating the table around the central axis of the crusher.
• the crusher comprises a series of ejectors fixed to the rotary table, as well as a series of anvils arranged on the internal vertical wall of the cylindrical tank, around the rotary table.
• the ejector is essentially in the form of a parallelepiped generally made of cast iron which is fixed to the rotary table of the crusher.
• the side of the ejector which is directed towards the axis of rotation of the table is called the nose of the ejector, while the face parallel to the anvils of the cylindrical tank forms the exit face of the ejector.
• the front face of the ejector called the working face is that which meets the material to be crushed and which in the direction of rotation of the ejector precedes the rear face.
• This front working face of the ejector can be provided with one or more cavities which do not pass through the entire structure of the ejector.
• These cavities form the pockets of the ejector which fill up during the rotation of the crusher.
• the material to be crushed is poured into the center of the rotary table by known means. Under the effect of the centrifugal force and under the impact with the working face of the ejectors, the material is projected in the direction of the anvils on which it is crushed to fall, in crushed form, at the bottom of the crusher from where it is evacuated. When the material is projected, the ejectors are subjected to very high stresses and are therefore subject to rapid wear. Description of solutions according to the state of the art
• the pocket ejectors used make it possible in certain applications, by accumulating material in the pockets, to considerably increase the life of these ejectors.
• wear is preferably done at the exit edge of the pockets, that is to say where the abrasion due to particles projected by force - 3 -
• centrifugal is the highest.
• the wear which nevertheless occurs is often located according to certain preferential paths, outside the initial cavities of the ejector. These preferential wear paths propagate over the entire structure of the ejector with the consequence of finally obtaining a part of which practically only the reinforcement is intact.
• the present invention essentially aims to avoid or at least reduce the drawbacks which result from the wear of the prior art ejectors.
• it aims to design an ejector with one or more pockets which resists the impact of the particles to be crushed and which, by having a high resistance to wear, almost no longer undergoes any degradation of its structure initial.
• an ejector with one or more pockets intended for these crushers of the centrifugal type with vertical axis and having an essentially parallelepiped shape, provided on its working face with one or more cavity forming the pockets of said ejector, characterized in that all or part of the periphery of the pocket (s) is made of a composite material itself formed from an alloy based on iron and ceramic very resistant to wear and created in situ during casting of the ejector.
• the specific characteristic of the present invention lies in the choice of a composite material formed by an alloy based on iron (cast iron or steel) and ceramic to constitute the reinforcing element, which is created in situ during the casting of the ejector.
• the reinforcement according to the invention will be produced from a metal / ceramic composite which is prepared from agglomerated ceramic grains based on alumina and / or zirconia or alumina zirconia which are infiltrated during pouring by the liquid metal used to form the body of the part.
• Fig. 1 shows a perspective view of a two-pocket ejector according to the invention.
• Fig. 2 shows a photograph illustrating the ejector with a single pocket according to the invention.
• Fig. 3 represents a photograph of the ejector at - 6 -
• FIGs. 4 and 5 represent two photographs of a two-pocket ejector according to the state of the art, illustrating preferential places of wear.
• Fig. 1 gives a schematic illustration of the ejector carrying the general reference 1 with two pockets 3 and 5 according to the invention, comprising the reinforcement in composite material identified by the general reference 6 and represented in hatched lines.
• This composite material is preferably made from an agglomerate of ceramic grains based on alumina-zirconia. These ceramic grains are produced in a conventional manner, by electro-fusion, by sintering, by thermal spraying or by any other process making it possible to merge the two constituents.
• the composite reinforcing structure is produced on the periphery of the pockets of the ejector at a minimum distance of 5 mm from the edges of the pockets thus preventing wear of the ejector at the lower edge 9, the upper edge 11, as well as at the nose 13 and at the outlet of the ejector 15.
• a complementary reinforcing structure (also shown in hatched lines) 17 can be provided in the outlet face of the ejector 1.
• the composite reinforcing structure does not necessarily have to be arranged over the entire width, length or depth of - 7 -
• Figures 2 and 3 show two ejectors of different configuration, one with a single pocket, the other with two pockets.
• the geometry of the composite structure is adapted to the geometric configuration of the ejector, chosen according to the material to be crushed.
• the particular configuration of the composite structure as illustrated has been chosen so as to, on the one hand, limit the wear of the entire part of the ejector and, on the other hand, to allow the ejector provided to be easily provided in situ. of the reinforcement structure during the casting of the ejector.
• the ejector is therefore constituted in the form of a heterogeneous element but without attached parts comprising in the areas subjected predominantly to wear, a reinforcement integrated in the ejector in the form of a structure based on a composite material which is made of an iron-based alloy (cast iron or steel) on the one hand and ceramic having the property of resistance to wear for the intended uses.
• Figs. 4 and 5 represent a photograph of an ejector with two pockets according to the prior art, where the preferential wear is located essentially at the level of the nose of the ejector as well as at the lower edge of the pockets in contact with the rotary table.
• Example An ejector with a composite reinforcement as shown in Figure 2 has been compared to a identical ejector without this composite reinforcement in a rhyolite crushing application with an inlet particle size between 3 and 40 mm.
• the service life of the composite reinforced ejector is double that obtained with equivalent ejectors without this reinforcement.

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Pulverization Processes (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)
• Crushing And Grinding (AREA)
• Prostheses (AREA)
• Particle Formation And Scattering Control In Inkjet Printers (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Medicinal Preparation (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 1998
  • 1998-03-17 BE BE9800211A patent/BE1011841A3/fr not_active IP Right Cessation
• 1999
  • 1999-03-16 PT PT99911529T patent/PT1064096E/pt unknown
  • 1999-03-16 CA CA002322861A patent/CA2322861C/en not_active Expired - Fee Related
  • 1999-03-16 ES ES99911529T patent/ES2209411T3/es not_active Expired - Lifetime
  • 1999-03-16 WO PCT/BE1999/000034 patent/WO1999047264A1/fr not_active Ceased
  • 1999-03-16 HU HU0100924A patent/HU226992B1/hu not_active IP Right Cessation
  • 1999-03-16 EP EP99911529A patent/EP1064096B1/de not_active Expired - Lifetime
  • 1999-03-16 SK SK1386-2000A patent/SK285790B6/sk not_active IP Right Cessation
  • 1999-03-16 PL PL99343027A patent/PL194714B1/pl not_active IP Right Cessation
  • 1999-03-16 CN CN99804052A patent/CN1104287C/zh not_active Expired - Fee Related
  • 1999-03-16 DE DE69912409T patent/DE69912409T2/de not_active Expired - Lifetime
  • 1999-03-16 KR KR10-2000-7010202A patent/KR100528303B1/ko not_active Expired - Fee Related
  • 1999-03-16 JP JP2000536488A patent/JP4092077B2/ja not_active Expired - Fee Related
  • 1999-03-16 TR TR2000/02676T patent/TR200002676T2/xx unknown
  • 1999-03-16 AU AU52643/99A patent/AU736079B2/en not_active Ceased
  • 1999-03-16 AT AT99911529T patent/ATE252946T1/de active
  • 1999-03-16 CZ CZ20003140A patent/CZ296643B6/cs not_active IP Right Cessation
• 2000
  • 2000-09-15 US US09/663,244 patent/US6588692B1/en not_active Expired - Fee Related

Non-Patent Citations (1)

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