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
  • B02C13/1814—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 on top of a disc type rotor
  • B02C13/1828—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 on top of a disc type rotor with dead bed protected beater or impeller elements
• • 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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C4/00—Crushing or disintegrating by roller mills
  • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
  • B02C4/08—Crushing or disintegrating by roller mills with two or more rollers with co-operating corrugated or toothed crushing-rollers

Definitions

• the present invention relates to an impactor (also called an ejector or “impeller”), intended for so-called VSI (Vertical Shaft Impacter) crushers, that is to say centrifugal crushers with vertical axis and comprising a reinforcing structure.
• VSI Vertical Shaft Impacter
• Crushers of the aforementioned type are well known and widely used for crushing rock aggregates, inter alia in quarries and cement factories. Reference is made to it in document WO 99/47264 and in other documents cited in this publication.
• the 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 impactors or 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 impactor is most often in the form of a parallelepiped generally made of cast iron which is fixed to the rotary table of the crusher.
• the face of the impactor which is directed towards the axis of rotation of the table is called the nose of the impactor, while the opposite face of the anvils fixed on the cylindrical tank forms the exit face of the impactor.
• the front face of one impactor called the working face is that which meets the material to be crushed and which in the direction of rotation of the impactor precedes the rear face.
• This front working face of the impactor can be provided with one or more cavities which do not cross the entire structure of the impactor and which form pockets which fill with material during the rotation of the crusher and thus protect the impactor from impact and wear, under the effect of the material accumulated in the pockets.
• the material to be crushed is poured into the center of the rotary table by known means. Under the effect of centrifugal force and under the impact with said working face, the material is projected towards the anvils on which it is crushed to fall, in crushed form, to the bottom of the crusher from where it is discharged . During the projection of the material, the impactors are subjected to very high stresses and are therefore subject to rapid wear.
• the pocket impactors used make it possible in certain applications, by accumulating material in the pockets, to considerably increase the life of the impactors. Due to the fact that in this type of impactor, it is observed that the wear is preferably done at the level of the exit edge of the pockets, that is to say where the abrasion due to the particles projected by the force centrifugal is the highest. Document W099 / 47264 already mentioned, as well as various documents cited therein, provide protections or reinforcements to avoid or reduce these wear effects.
• the specific solution proposed in W099 / 47264 namely the manufacture of an impactor with one or more pockets having an essentially parallelepiped shape consists of creating over the entire periphery of the pocket or pockets or on a part thereof , a reinforcing structure of a composite material itself obtained from an iron-based alloy and very wear-resistant ceramic grains.
• This structure which is formed in situ when the impactor is cast by the infiltration of the liquid metal used to form the body of the part in a mass of ceramic grains and binder, has been found to be particularly effective in ensuring a duration of increased impactor operation.
• the pockets are empty and not protected by the material to be ground.
• the thin walls are particularly exposed to the impacts of larger aggregates or foreign bodies (pieces of steel, shovel teeth, etc.). This can lead to the rupture of the most fragile reinforced walls, which seriously damages the part and often requires having to replace it very quickly after the first commissioning.
• the invention aims to solve the problems mentioned above and, in particular, to further improve the performance of the impactors by taking advantage of the intrinsic advantages of the technology for manufacturing the impactors described in document WO99 / 47264.
• Main characteristic elements of the invention The invention proposes an impactor intended for vertical axis centrifugal crushers which, unlike those of the aforementioned prior art, does not deliberately comprise initially, it is that is to say during the first commissioning, no cavities or pockets, but which is provided on its working face with a reinforcing structure consisting of a composite material obtained from an iron-based alloy and ceramic grains very resistant to wear and formed in situ when the impactor is poured by infiltration of the liquid metal used to form the body of the part in a mass of ceramic grains and binder.
• Said reinforcing structure is provided on the working face in an adequate geometrical arrangement in order to let the metal outcrop locally (that is to say in the zones without reinforcing structure) up to the working surface, so that wear in service automatically causes the formation of pockets or cavities which, when filled with crushed material, exert a shock protection function, while maintaining the reinforcing structure at the upper periphery of the pockets which are thus formed , that is, on the work surface.
• the impactor obtained makes it possible to entirely solve the aforementioned problems.
• the amount of metal available for infiltrating the support is, in the case of the invention, all of the metal constituting the part instead of being only the metal constituting a single wall.
• the technique of the invention makes it possible to significantly improve the service life because as soon as the formation of the pockets is initiated, one already benefits from one self-protection due to the material retained in these pockets in formation.
• the progression of the formation of pockets is slowed down and when we arrive at the complete formation of these, we have gained in lifespan all the time necessary for this training.
• W099 / 47264 of a reinforcing structure made of a composite material, obtained in situ by the infiltration of a liquid metal into a ceramic mass with the facilities and advantages of the production of a part, without the obligation to provide one or more pockets.
• the method used is particularly simple to implement since it suffices to fix in the bottom of a mold, by conventional means such as gluing, mechanical fixing, nails, screws, anchor rods or others depending on the geometrical arrangement desired to subsequently allow the formation of one or more pockets by wear, a lining of wear-resistant technical ceramic material, preferably in the form of a mass of ceramic grains based on alumina and zirconia and d a binder, and then casting the metallic mass used to form the body of ⁇ impactor.
• This metal by infiltrating the ceramic mass, ensures its perfect connection with the cast part during the cooling of the part. Then it is enough to unmold the part and, after a possible finishing (deburring etc.), the impactor can be directly put into service.
• Figure 1 a perspective view of a pocket impactor according to the prior art, with ceramic reinforcement infiltrated by metal;
• Figure 2 a perspective view of an impactor with the same type of reinforcement and without pockets, according to the present invention
• Figure 3 a longitudinal sectional view of an impactor according to Figure 2 with the evolutionary outline of the profile of the pockets during their formation. Description of a preferred embodiment of the invention Identical reference marks are used in the different figures for identical or similar constituent elements.
• a conventional pocket impactor 1 Has one or more pockets, in this case the two pockets 2 and 2 'made of foundry, before the impactor 1 is put into service.
• This impactor advantageously includes reinforcements 4 in infiltrated ceramic.
• the nose 6 of the impactor and the outlet face 7 of the impactor which are in principle also highly stressed, may include additional reinforcements, such as the reinforcement 8 shown in FIG. 1.
• the impactor 1 is designed before commissioning as a solid piece, without pockets on its working face 5, but provided with reinforcements 4 made of foundry.
• These reinforcements can be arranged, - as shown in the view of Figure 2, in a shape and an arrangement similar to those provided in the figure
• the invention therefore provides a simple solution to various technical problems of producing impactors, in particular greater freedom of design thereof.
• the execution of the recommended technique is moreover inexpensive.
• the cost of the additional cast iron to be used is largely offset by the increased operating time, the ease of execution and the absence of the need to provide specific means for creating the pockets during the casting of the part.
• Additional reinforcements for the nose and the exit face of the impactor can also be provided in the embodiment of the invention, in particular of the Figures 2 and 3. They are not shown there, only for the sake of clarity of the drawing.

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Pulverization Processes (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)
• Tunnel Furnaces (AREA)
• Secondary Cells (AREA)
• Ceramic Capacitors (AREA)
• Percussive Tools And Related Accessories (AREA)
• Centrifugal Separators (AREA)

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Publications (1)

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Citations (3)

• 2000
  • 2000-08-02 WO PCT/BE2000/000091 patent/WO2002009878A1/fr not_active Ceased
  • 2000-08-02 SK SK1767-2002A patent/SK286255B6/sk not_active IP Right Cessation
  • 2000-08-02 CN CNB008197660A patent/CN1246080C/zh not_active Expired - Fee Related
  • 2000-08-02 EP EP00951123A patent/EP1305116B1/fr not_active Expired - Lifetime
  • 2000-08-02 PL PL00364776A patent/PL195796B1/pl not_active IP Right Cessation
  • 2000-08-02 MX MXPA03001000A patent/MXPA03001000A/es active IP Right Grant
  • 2000-08-02 CA CA002412314A patent/CA2412314C/en not_active Expired - Fee Related
  • 2000-08-02 HU HU0301785A patent/HU226990B1/hu not_active IP Right Cessation
  • 2000-08-02 JP JP2002515420A patent/JP4084996B2/ja not_active Expired - Fee Related
  • 2000-08-02 DE DE60019346T patent/DE60019346T2/de not_active Expired - Lifetime
  • 2000-08-02 CZ CZ20024016A patent/CZ298653B6/cs not_active IP Right Cessation
  • 2000-08-02 KR KR1020037000067A patent/KR100672270B1/ko not_active Expired - Fee Related
  • 2000-08-02 AU AU2000264177A patent/AU2000264177B2/en not_active Ceased
  • 2000-08-02 PT PT00951123T patent/PT1305116E/pt unknown
  • 2000-08-02 ES ES00951123T patent/ES2235923T3/es not_active Expired - Lifetime
  • 2000-08-02 AT AT00951123T patent/ATE292520T1/de active
  • 2000-08-02 AU AU6417700A patent/AU6417700A/xx active Pending

Patent Citations (3)

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