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

Definitions

• the present invention relates to a roller for the crushing of particulate material, such as crude ore for use in the cement or minerals industries, by which a roller body is provided with a plurality of individual wear segments which are arranged on longitudinal guiding means and between clamps such that two or more of the wear segments are fixed to the same lateral section of one lateral portion of the roller body in a manner such that the frequency of, and cost associated with, the replacement of such wear segments is minimized.
• the invention also relates to the plurality of individual wear segments and to a method of manufacturing the roller.
• the roller may for example be used in a vertical roller mill, in a high-pressure grinding roller press, or in similar equipment for crushing of particulate material.
• rollers are arranged laterally on the roller body (i.e. - when the roller is viewed in the longitudinal direction so that the center axis of the rollers extends laterally through the center shaft of the roller body, the wear segments are arranged laterally on the circumference of the grinding roller so that a wear segment spans an entire lateral portion of the grinding roller).
• the foregoing design is not advantageous because it still results in a time-consuming repair process and may result in losses such as superfluous operational downtime, increased labor and material costs, and reduced throughput.
• the non-uniform wear will also result in non- optimal production and an increase in energy.
• a new type of crushing roller, and wear segments therefor are needed in order to reduce costs and time associated with the frequent repair and/or replacement of premature segmented discs.
• a new type of crushing roller, and wear segments therefor are needed in order to maintain a uniform wear across the full width of roller segments (in the lateral direction).
• such new type of crushing rollers will allow for easy replacement or refurbishment when the outer half of wear segments (i.e. - the wear segments which are typically the most worn) need replacement and will provide for uniform wear in order to achieve and maintain optimum production and minimize the loss of energy throughout the life of the wear segments.
• a roller for crushing particulate material which includes a roller body 2 with a center axis 3, a plurality of wear segments 4, 5, having crushing surfaces, that are fixed to the roller body 2; a plurality of clamps 7, 8 disposed on the sides of the roller body 2; a guiding means 6 disposed on the roller body 2 between the clamps 7, 8; where the guiding means 6 run longitudinally and where the wear segments 4, 5 are arranged on the guiding means 6.
• the plurality of wear segments 4, 5 can include grooves 1 1 and knobs 12, the grooves 1 1 and knobs 12 cooperating with the guiding means 6 to fix the plurality of wear segments 4, 5 to the roller body 2.
• the roller 1 can also include a plurality of keys 10, the plurality of keys 10 being fixed to the roller body 2.
• the plurality of wear segments 4, 5 can also include keyways 13, the keyways 13 cooperating with the plurality of keys 10 to prevent the plurality of wear segments 4, 5 from moving in the longitudinal direction.
• the plurality of wear segments 4, 5 can also include projections 14, 15.
• a wear segment 4 is provided for arrangement on longitudinal guiding means 6 of a roller for crushing particulate material which includes a groove 1 1 and a knob 12, wherein the groove 1 1 is configured to accept a longitudinal guiding means 6 and wherein the knob 12 is configured to extend at least partially over a portion of the guiding means 6.
• the wear segment 4 can also include a plurality of keyways 13, the keyways 13 cooperating with keys 10 on a roller body to prevent the wear segment 4 from moving in the longitudinal direction.
• the wear segment 4 can also include projections 14, 15 disposed on the knobs 12 of the longitudinal side of the wear segments 4, 5 that face the longitudinal guiding means 6
• a method for manufacturing a roller 1 for crushing particulate material is also provided.
• the method includes the steps of: affixing a plurality of wear segments 4, 5 to a roller body 2 having a center axis 3, by arranging the wear segments 4, 5 on longitudinal guiding means 6 and disposing the wear segments 4, 5 between a plurality of clamps 7, 8; and tightening at least one of the plurality of clamps 7, 8 so that a first longitudinal side of wear segment 4 abuts guiding means 6 and a first longitudinal side of wear segment 5; a second longitudinal side of wear segment 4 abuts plurality of clamps 7 and a second longitudinal side of wear segment 5 abuts plurality of clamps 8.
• the method may also include additional steps as further described herein.
• Figure 1 shows a three-dimensional model of a roller according to an exemplary embodiment of the invention.
• Figure 2 shows a cross-sectional view of a roller according to an exemplary embodiment of the invention.
• Figure 3 shows an exploded three dimensional view of a roller according to an exemplary embodiment of the invention.
• Figure 4 shows a three-dimensional model of a roller according to another exemplary embodiment of the invention.
• Figure 5 shows a cross-sectional view of a roller according to another exemplary embodiment of the invention.
• Figure 6 shows a bottom angled view of a wear segment according to an exemplary embodiment of the invention.
• Figure 7 shows a cross-sectional view of a roller according to another exemplary embodiment of the invention.
• a roller 1 for crushing particulate material has a roller body 2 which has a center axis 3 extending laterally through the center shaft of the roller body 2.
• the outer circumference of the roller body 2 is provided with a plurality of individual wear segments 4, 5; the plurality of wear segments 4, 5 having crushing surfaces.
• the plurality of wear segments 4, 5 may have different crushing surfaces.
• wear segment 5 can be made of an exotic, high end wear surface, for example a ceramic or another hard cast or forged material, without limitation; and wear segment 4 can be made of a traditional wear surface (for example, cast iron, austempered ductile iron, carbidic austempered ductile iron or polyurethane).
• the crushing surface of the wear segments 4, 5 may be PTA, hard-faced, sintered, hipped or may have studs (made of for example, tungsten carbide) embedded therein to increase the service life of the plurality of wear segments 4, 5.
• the plurality of wear segments 4, 5 are fixed to the roller body 2.
• the roller has a plurality of clamps 7, 8 which are disposed on the longitudinal (i.e. - when the roller 1 is viewed in an orientation where the center axis 3 runs laterally through the center shaft of said roller body 2) sides of the roller body 2.
• the roller 1 has guiding means 6 disposed on the roller body 2 between the plurality of clamps 7, 8 which are disposed on the longitudinal sides of the roller body 2.
• Guiding means 6 run longitudinally (i.e. - when the roller 1 is viewed in an orientation where the center axis 3 runs laterally through the center shaft of said roller body 2) (also referred to herein as “longitudinal guiding means” or simply “guiding means”) about the circumference of the roller body 2.
• the guiding means 6 is substantially parallel to plurality of clamps 7 and plurality of clamps 8.
• the position of longitudinal guiding means 6 is determined by the regular wear pattern for a particular grinding roller application.
• the wear pattern of a grinding roller application shows that wear is greater on the left longitudinal 2/3 of the grinding roller
• guiding means 6 may be disposed 2/3 from the left longitudinal side of the grinding roller.
• Such orientation allows for placement of high end exotic wear segments to be placed in the area where wear is the greatest and for utilization of a conventional wear segments in the remaining 1 /3.
• Such an arrangement allows for a uniform wear profile.
• the guiding means 6 is a single uniform piece. In other embodiments the guiding means 6 are multiple pieces. Guiding means 6 are typically wedge shaped but can also be substantially rectangular in shape. Guiding means 6 may be composed of a high strength or low alloy steel, for example CrMo, without limitation. In one embodiment, the guiding means 6 is floating (i.e. - it is not affixed to the roller body 2 by a fastening means). However, as depicted in Figure 5, in another embodiment the guiding means 6 are fixed to the roller body 2 by a fastening means 9, in this case, for example, radially located screws.
• the roller body 2 may have two or more guiding means 6 which are disposed on the roller body 2 between the plurality of clamps 7, 8 which are disposed on the longitudinal sides of the roller body 2.
• Each of the two or more guiding means 6 run longitudinally (i.e. - when the roller 1 is viewed in an orientation where the center axis 3 runs laterally through the center shaft of said roller body 2) about the circumference of the roller body 2.
• the position of the division of the two or more guiding means 6 is determined by the regular wear pattern for the grinding roller application.
• one of said plurality of clamps 7 is fixed and another of said plurality of clamps 8 is movable.
• the plurality of wear segments 4, 5 are arranged on longitudinal guiding means 6.
• three or more longitudinal wear segments 4, 5 can be laterally aligned, meaning that the three or more longitudinal wear segments may be fixed to the same lateral section of one lateral portion of the roller body 2.
• the three or more wear segments can have different wear surfaces.
• the wear segments 4, 5 can be smaller and lower in weight, as opposed to if the guiding means was to run laterally. Additionally, by arranging the wear segments 4, 5 on a longitudinal guiding means 6, a longitudinal half of the wear segment (i.e. - 5) can be replaced without replacing its corresponding longitudinal half of wear segment (i.e. - 4). This arrangement is advantageous because wear profiles of certain grinding mills have shown that one longitudinal side of the roller surface wears more heavily than the other side. Such an arrangement allows the reduction of the initial costs associated with wear parts (i.e. - allowing for exotic wear parts to be used on only one longitudinal half) and allows for the amount of scrapped material to be reduced when repair is necessary. Such an arrangement promotes uniform wear across lateral subsections of the roller allowing for more efficient grinding and lower energy consumption. This arrangement also translates to less operational downtime, decreased labor costs and increased throughput.
• a wear segment 4 is arranged adjacent to the wear segment 5 so that when the roller body 2 is viewed so that the roller 1 is in an orientation so that the center axis 3 extends laterally through the center shaft of the roller body 2, a first long side of a wear segment 4 abuts a first long side of the wear segment 5, a second long side of the wear segment 4 abuts a clamp 7 and the second long side of the wear segment 5 abuts a clamp 8.
• the plurality of wear segments 4, 5 have grooves 1 1 and knobs 12.
• the grooves 1 1 and knobs 12 cooperate with longitudinal guiding means 6 in order to fix the plurality of wear segments 4, 5 to the roller body 2.
• the knob 12 of a wear segment 5 abuts the knob 12 of a wear segment 4 and the longitudinal guiding means 6 extends into the grooves 1 1 of wear segment 5 and wear segment 4.
• keys 10 may be disposed on the roller body 2. Keys 10 are configured to prevent longitudinal shifting of the wear segments 4, 5.
• the wear segments 4, 5 have keyways 13, wherein the keys 10 interlock with the keyways 13 to further prevent the longitudinal shift of the wear segments 4, 5.
• shearing pins 16 may be disposed on the roller body 2. Shearing pins 16 are configured to prevent shifting of the wear segments 4, 5.
• the wear segments 4, 5 have pin holes 17, wherein the shearing pins 16 interlock with the pin holes 17 to further prevent the shift of the wear segments 4, 5.
• the wear segments 4, 5 have mating male projections 14 and/or female projections 15. The projections 14, 15 are disposed on the knobs 12 of the longitudinal side of the wear segments 4, 5 that face the longitudinal guiding means 6. As shown in Figures 2, 3 and 5, the wear segments 4, 5 are arranged on longitudinal guiding means 6.
• the wear segments 4, 5 may contain knotches disposed on the longitudinal side of the wear segments 4, 5 that face the clamps 7, 8. The knotches cooperate with the clamps 7, 8 to create a tight fit and to further secure the plurality of wear segments 4, 5 to the roller body 2.
• a method for manufacturing a roller 1 according to the invention is also disclosed.
• wear segments 4, 5 are arranged on a roller body 2 on longitudinal guiding means 6 and between a plurality of clamps 7, 8.
• the plurality of clamps 7, 8 are tightened forcing a first longitudinal side of a wear segment 4 to abut guiding means 6 and a first longitudinal side of wear segment 5; a second longitudinal side of wear segment 4 to abut the plurality of clamps 7 and a second longitudinal side of wear segment 5 to abut plurality of clamps 8.
• keys 10 are fixed on the roller body and wear segments 4, 5 with keyways 13 are arranged on a roller body 2 on longitudinal guiding means 6 and between a plurality of clamps 7, 8.
• the plurality of clamps 7, 8 are tightened forcing a first longitudinal side of a wear segment 4 to abut guiding means 6 and a first longitudinal side of wear segment 5; a second longitudinal side of wear segment 4 to abut the plurality of clamps 7 and a second longitudinal side of wear segment 5 to abut plurality of clamps 8.
• the wear segments 4, 5 have mating male projections 14 and/or female projections 15 the tightening interlocks the projections 14, 15 of a plurality of wear segments 4, 5.

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

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• 2015
  • 2015-07-22 CN CN201580041099.2A patent/CN106573246B/zh active Active
  • 2015-07-22 EP EP15741494.7A patent/EP3171980B1/en active Active
  • 2015-07-22 WO PCT/DK2015/050224 patent/WO2016012028A1/en active Application Filing

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