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EP4065281B1 - Élément résistant à l'usure pour un dispositif de broyage - Google Patents

Élément résistant à l'usure pour un dispositif de broyage Download PDF

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Publication number
EP4065281B1
EP4065281B1 EP20808486.3A EP20808486A EP4065281B1 EP 4065281 B1 EP4065281 B1 EP 4065281B1 EP 20808486 A EP20808486 A EP 20808486A EP 4065281 B1 EP4065281 B1 EP 4065281B1
Authority
EP
European Patent Office
Prior art keywords
wear
ceramic
resistant element
less
wear protection
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.)
Active
Application number
EP20808486.3A
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German (de)
English (en)
Other versions
EP4065281A1 (fr
Inventor
Baris Irmak
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.)
FLSmidth AS
Original Assignee
FLSmidth AS
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 DE102019218217.8A external-priority patent/DE102019218217A1/de
Priority claimed from BE20195837A external-priority patent/BE1027796B1/de
Application filed by FLSmidth AS filed Critical FLSmidth AS
Publication of EP4065281A1 publication Critical patent/EP4065281A1/fr
Application granted granted Critical
Publication of EP4065281B1 publication Critical patent/EP4065281B1/fr
Active 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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers
    • 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
    • B02C15/004—Shape or construction of rollers or balls
    • B02C15/005—Rollers or balls of composite construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like

Definitions

  • the invention relates to a wear protection element for partial insertion into a recess on the surface of a wear surface of a shredding device and a shredding device with such a wear protection element.
  • comminution devices such as grinding rollers or crushers, which are used in particular when comminuting hard ore, for example
  • a wear surface such as the grinding roller surface
  • it is made, for example, from the DE 2006 010 042 A1 known to apply additional wear protection elements to the surface of the grinding roller.
  • it is necessary to replace or renew the wear protection elements of the grinding roller, for example, in order to guarantee efficient grinding.
  • Such a replacement is very costly due to the frequency and number of wear protection elements.
  • the above-mentioned problem is also known from other technical areas, such as the storage of abrasive materials in a silo or bunker.
  • the invention comprises a wear protection element for attachment to a shredding device or a silo, the wear protection element being formed entirely from a ceramic comprising yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ), the TPZ has a volume fraction of at least 60%, preferably at least 80%, in particular 95% to 100% of the ceramic.
  • TPZ yttrium-stabilized, tetragonal polycrystalline zirconium oxide
  • the wear protection element is, for example, cylindrical or has a polygonal cross section.
  • one end of the wear protection element is designed such that it can be fastened to the surface of the wear surface, in particular in a recess in the surface of the wear surface.
  • the comminution device is, for example, a roller mill, a roller crusher, a hammer mill or a vertical roller mill, the wear surface being in particular the surface of a grinding roller which is exposed to high levels of wear during operation of the comminution device, the hammer tools and the surface of the grinding track of a hammer mill or the surface of the Rollers and the grinding plate of a vertical roller mill.
  • the wear protection element is, for example, plate-shaped and is attached to the inner wall of a warehouse, in particular a silo for mineral rocks.
  • the wear protection element is made entirely of ceramic. It is also conceivable that only a part of the wear protection element, such as the area protruding from the surface of the shredding device, is made of ceramic. For example, the wear protection element has a fastening area that is partially or completely attached in the recess in the surface of the shredding device and a wear area that is completely or partially formed from the ceramic.
  • a wear protection element made of yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ) has very favorable wear behavior together with high toughness. This is particularly advantageous when using such wear protection elements in shredding devices.
  • the ceramic has a porosity of less than 5%, preferably less than 4%, in particular less than 3%.
  • the ceramic preferably has a porosity of at least 1%.
  • a porosity of less than 5%, preferably less than 4%, in particular less than 3% leads to improved wear behavior.
  • the aforementioned porosity information is preferably the total porosity, which corresponds to an average value of the pore sizes of the material.
  • the pores are substantially evenly distributed throughout the ceramic material.
  • the ceramic has a density of 1.5 to 5 g/cm 3 , preferably 2 to 4 g/cm 3 , in particular 2.7 to 3 g/cm 3 .
  • the ceramic has an Al2O3 (corundum) content of 10%. This leads to improved wear resistance with a small reduction in the toughness of the ceramic.
  • the ceramic has a ratio of monoclinic to tetragonal zirconium oxide of less than 40%, in particular less than 30%, preferably less than 20%.
  • the ratio of monoclinic to tetragonal zirconium oxide is preferably at least 2%.
  • the zirconium oxide contained in the ceramic has less than 40%, in particular less than 30%, preferably less than 20% monoclinic zirconium oxide, the remaining zirconium oxide being tetragonal zirconium oxide.
  • the ratio of monoclinic to tetragonal zirconium oxide is determined, for example, using X-ray diffraction in accordance with ISO 13356.
  • the yttrium-stabilized zirconium oxide of the ceramic has a grain size D50 of less than 1.5 ⁇ m, preferably less than 1 ⁇ m, in particular less than 0.8 ⁇ m.
  • the D50 grain size of the ceramic is preferably at least 0.2 ⁇ m.
  • the D50 value refers to the grain size of 50% of the ceramic grains.
  • 50% of the grains of the yttrium-stabilized zirconium oxide have a grain size diameter of less than 1.5 ⁇ m, preferably less than 1 ⁇ m, in particular less than 0.8 ⁇ m.
  • the D90 value of the grain size is preferably less than 3 ⁇ m, in particular less than 2 ⁇ m, preferably less than 1.5 ⁇ m. Wear protection elements of a shredding device are exposed to local stresses. Therefore, a wide grain size distribution should be avoided in order to prevent the formation of cracks or breakouts.
  • the ceramic has an yttrium content of 2-4 mol% Y2O3.
  • the advantages of such an yttrium content are better sintering behavior at an even lower sintering temperature, as well as a finer crystalline structure, which in turn leads to higher fatigue resistance and improved fracture toughness.
  • the ceramic has, for example, Ce-TZP with a content of 10 - 12 mol% of CeO2.
  • the ceramic has a content of 8-10 mol% of Mg-PSZ. It is also conceivable that the ceramic has a content of 5-10 mol% of MgO as a stabilizer.
  • the ceramic has a number of pores with a size of more than 200 ⁇ m of less than 0.1 per mm 2 .
  • the number of pores per surface also provides an indication of wear resistance.
  • a small number of pores of a relatively large size, such as more than 200 ⁇ m, ensures high wear resistance as local breakouts from the ceramic material are avoided.
  • the ceramic preferably has a number of pores with a size of more than 150 ⁇ m of less than 0.4 per mm 2 .
  • the ceramic has a number of pores with a size of more than 100 ⁇ m of less than 2 per mm 2 . Such a number of pores significantly increases the service life of the wear protection element.
  • the invention also includes a shredding device with a wear surface and a wear protection element as described above, the wear protection element being at least partially mounted in a recess in the surface of the wear surface.
  • the wear protection element is materially connected to the wear surface, in particular welded, glued or soldered.
  • a comminution device 10 in particular a roller mill, is shown schematically.
  • the comminution device 10 comprises two grinding rollers, shown schematically as circles, with wear surfaces 12, 14, which have the same diameter and are arranged next to one another.
  • a grinding gap is formed between the wear surfaces 12, 14 of the grinding rollers, the size of which can be adjusted, for example.
  • the grinding rollers rotate in opposite directions to one another in the direction of rotation shown by the arrows, with material to be ground passing through the grinding gap in the direction of fall and being ground.
  • Fig.2 shows an end region of a grinding roller which has a wear surface 12 on which wear protection elements 16 are attached.
  • the wear protection elements 16 are mounted in the outer periphery of the surface of the grinding roller.
  • the wear protection elements 16 which are spaced apart from one another and arranged next to one another Fig. 2 a circular cross section. It is also conceivable that the wear protection elements 16 vary across the surface of the grinding roller in size, number, cross-sectional shape and arrangement relative to one another in order, for example, to compensate for local differences in wear during operation of the comminution device 10.
  • the grinding roller has wear protection corner elements 17 attached to its end, which, for example, have a rectangular cross section and are arranged next to one another in a row in such a way that they form a ring over the circumference of the grinding roller.
  • Other cross-sectional shapes of the wear protection corner elements 17 are also conceivable, which differ from those in Fig. 2 Cross-sectional shape shown may vary.
  • An arrangement of the wear protection corner elements 17 at a distance from one another is also possible.
  • Fig. 2 For example, only the left end of the grinding roller with the wear surface 12 is shown, the right end, not shown, advantageously being identical in structure.
  • Fig. 3 shows a wear protection element 16 in a sectional view.
  • the wear protection element is, for example, cylindrical and made entirely of ceramic.
  • the ceramic is the yttrium-stabilized, tetragonal polycrystalline zirconium oxide (TPZ), the TPZ having a volume fraction of at least 60%, preferably at least 80%, in particular 95% to 100% of the ceramic.
  • TPZ yttrium-stabilized, tetragonal polycrystalline zirconium oxide
  • the ceramic material offers the advantage of particularly high wear resistance while being relatively inexpensive to produce.
  • Fig. 4 shows an exemplary embodiment which does not correspond to the invention, wherein the wear protection element 16 has a jacket 18 and a core 20 which is at least partially radially surrounded by the jacket 18.
  • the core 20 extends axially along the central axis of the essentially cylindrical wear protection element 16 to the upper end face of the wear protection element 16.
  • the core 20 is, for example, cylindrical and is preferably firmly connected to the jacket 18. It is also conceivable that a plurality of cores 20, for example two, four or six cores 20, extend through the wear protection element 16, preferably parallel to one another.
  • the diameter of the core 20 is, for example, approximately 10 to 30% of the diameter of the wear protection element 16.
  • Fig. 4 shows a sectional view of the wear protection element 16 not according to the invention.
  • the wear protection element 16 has a fastening area 24 and a wear area 22, the fastening area 24 being arranged in the recess 26 on the surface of the wear surface 12 of the grinding roller and being connected to the wear surface 12 of the grinding roller.
  • the wear protection element 16 is cohesively connected to the fastening area 24 with the recess 26 in the surface of the wear surface 12 of the grinding roller, in particular welded, soldered or glued or positively connected, in particular screwed or wedged.
  • the wear area 22 of the wear protection element 16 is at least partially or completely arranged outside the recess 26 in the wear surface 12, so that it protrudes from the surface of the wear surface 12 in the radial direction of the grinding roller, not shown.
  • the fastening area 24 comprises approximately a third of the entire wear protection element 16, with the wear area 22 approximately comprising the further two thirds.
  • the fastening area 24 is made of a metal, such as steel.
  • the wear area 22 of the wear protection element 16 has the jacket 18 and the core 20, the jacket 18 preferably made of a ceramic material, such as tungsten carbide, titanium carbide, titanium carbonitride, vanadium carbide, chromium carbide, tantalum carbide, boron carbide, niobium carbide, molybdenum carbide, aluminum oxide, zirconium oxide, and / or silicon carbide or a combination of the materials mentioned.
  • the ceramics include Yttrium-stabilized tetragonal polycrystalline zirconia (TPZ).
  • particles made of industrial diamonds, for example high-strength ceramics can also be embedded in a ceramic or metallic matrix in the jacket 18.
  • the jacket 18 has a matrix material in which a plurality of particles are arranged.
  • the particles are in particular a highly wear-resistant material, which includes, for example, diamond, ceramic or titanium.
  • the matrix material includes, for example, tungsten carbide.
  • the particles are in particular bonded to the matrix material, for example by sintering.
  • the wear protection elements 16 are exposed to a high level of wear, with the wear area 22 of the wear protection elements 16 protruding from the surface of the wear surfaces 12, 14 of the grinding rollers in particular wearing out.
  • the wear-resistant material of the wear area 22 significantly reduces the wear of the wear protection elements 16.
  • the fastening area which is exposed to little or no wear, is not made from the more expensive, wear-resistant material.
  • the metal core makes it possible to remove the wear protection element from the recess 26 in the roller surface, even if the wear area 22 is already heavily worn, by pulling out the wear protection element 16 on the metal core 20 using an appropriate tool.
  • the fastening area 24 is made entirely of metal and is firmly connected to the core 20.
  • the fastening area 24 is glued, soldered or welded to the core 20 or formed in one piece with it.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (8)

  1. Élément de protection contre l'usure (16) destiné à être monté dans un dispositif de broyage ou un silo, caractérisé en ce que l'élément de protection contre l'usure (16) est conçu intégralement à partir d'une céramique comprenant de l'oxyde de zirconium polycristallin tétragonal (TPZ) stabilisé à l'yttrium, ledit TPZ représentant une proportion en volume d'au moins 60 %, de préférence d'au moins 80 %, et plus particulièrement de 95 à 100 % au sein de ladite céramique.
  2. Élément de protection contre l'usure (16) selon la revendication 1, dans lequel la céramique a une porosité inférieure à 5 %, de préférence inférieure à 4 % et plus particulièrement inférieure à 3 %.
  3. Élément de protection contre l'usure (16) selon l'une des revendications précédentes, dans lequel la céramique présente un rapport de l'oxyde de zirconium monoclinique à l'oxyde de zirconium tétragonal allant de 10 à 40 %, notamment de moins de 30 % et de préférence de moins de 20 %.
  4. Élément de protection contre l'usure (16) selon l'une des revendications précédentes, dans lequel l'oxyde de zirconium stabilisé à l'yttrium de la céramique présente une granulométrie D50 inférieure à 1,5 µm, de préférence inférieure à 1 µm et plus particulièrement inférieure à 0,8 µm.
  5. Élément de protection contre l'usure (16) selon l'une des revendications précédentes, dans lequel la céramique présente une teneur en yttrium allant de 2 à 4 % molaire de Y2O3.
  6. Élément de protection contre l'usure (16) selon l'une des revendications précédentes, dans lequel la céramique présente une densité de pores d'une taille supérieure à 200 µm qui est inférieure à 0,1/mm2.
  7. Dispositif de broyage (10) présentant une surface d'usure (12, 14) et un élément de protection contre l'usure (16) selon l'une des revendications 1 à 6, ledit élément de protection contre l'usure (16) étant monté au moins partiellement dans un évidement (26) ménagé dans la face supérieure de la surface d'usure (12, 14).
  8. Dispositif de broyage (10) selon la revendication 7, dans lequel l'élément de protection contre l'usure (16) est raccordé par liaison de matière à la surface d'usure (12, 14), notamment par soudage, collage ou brasage.
EP20808486.3A 2019-11-26 2020-11-25 Élément résistant à l'usure pour un dispositif de broyage Active EP4065281B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019218217.8A DE102019218217A1 (de) 2019-11-26 2019-11-26 Verschleißschutzelement für eine Zerkleinerungseinrichtung
BE20195837A BE1027796B1 (de) 2019-11-26 2019-11-26 Verschleißschutzelement für eine Zerkleinerungseinrichtung
PCT/EP2020/083406 WO2021105235A1 (fr) 2019-11-26 2020-11-25 Élément résistant à l'usure pour un dispositif de broyage

Publications (2)

Publication Number Publication Date
EP4065281A1 EP4065281A1 (fr) 2022-10-05
EP4065281B1 true EP4065281B1 (fr) 2024-03-06

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EP20808486.3A Active EP4065281B1 (fr) 2019-11-26 2020-11-25 Élément résistant à l'usure pour un dispositif de broyage

Country Status (6)

Country Link
US (1) US20220410169A1 (fr)
EP (1) EP4065281B1 (fr)
CN (1) CN114375228B (fr)
DK (1) DK4065281T3 (fr)
FI (1) FI4065281T3 (fr)
WO (1) WO2021105235A1 (fr)

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WO2017125309A1 (fr) * 2016-01-22 2017-07-27 Thyssenkrupp Industrial Solutions Ag Élément anti-usure pour dispositif de fragmentation
EP2512680B1 (fr) * 2009-12-18 2019-01-02 Metso Sweden AB Insert longitudinal bi-materiaux pour rouleaux de broyeur

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EP2512680B1 (fr) * 2009-12-18 2019-01-02 Metso Sweden AB Insert longitudinal bi-materiaux pour rouleaux de broyeur
EP3088084A1 (fr) * 2015-04-29 2016-11-02 Takraf GmbH Corps dur pour un blindage en réseau pour une presse à rouleaux, son procédé de production, et rouleau pour une presse à rouleaux
WO2017125309A1 (fr) * 2016-01-22 2017-07-27 Thyssenkrupp Industrial Solutions Ag Élément anti-usure pour dispositif de fragmentation

Also Published As

Publication number Publication date
CN114375228A (zh) 2022-04-19
CN114375228B (zh) 2024-06-28
WO2021105235A1 (fr) 2021-06-03
FI4065281T3 (fi) 2024-03-26
BR112022009847A2 (pt) 2022-08-02
EP4065281A1 (fr) 2022-10-05
US20220410169A1 (en) 2022-12-29
DK4065281T3 (da) 2024-04-02

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