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
  • B02C13/26—Details
  • B02C13/28—Shape or construction of beater elements
  • B02C13/2804—Shape or construction of beater elements the beater elements being 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

Definitions

• the invention relates to a centrifugal edge wear unit for a centrifugal mill.
• Such wear units are known, for example, from the "BHS rotor mill” brochure.
• centrifugal mills of this type the ground material is introduced centrally into a rotor rotating about an essentially vertical axis.
• this rotor due to the centrifugal force, it is distributed over a plurality of centrifugal chambers, each of which is delimited by a centrifugal blade.
• a material bed of regrind is formed which protects the centrifugal wall from wear.
• the regrind particles are accelerated radially outwards along a surface of this material bed, emerge from the rotor at a centrifugal edge and, after a brief free flight, hit a baffle wall on which the main comminution of the regrind takes place.
• the baffle can be formed from a plurality of wear-resistant baffle plates or a material bed made of ground material.
• the centrifugal edge which forms the radially outer end of the blade wall, is, as can easily be seen from the above explanation of the physical processes in the centrifugal mill rotor, subjected to severe wear due to abrasion, since the ground material on the wear edge is essentially tangential to the surface of the moved along the wear edge forming element.
• the element forming the wear edge is also exposed to stress caused by regrind rebounding from the baffle.
• the movement of these rebounding regrind particles has a significant component that is orthogonal to the surface of the particles that is used by these particles Sling edge element is directed. So this is more like an impact load.
• the conventional sling edge wear units comprise a hard metal part which both forms the sling edge and serves to protect against rebound wear.
• This hard metal part is soldered or glued to a non-hardened metal part which is used to fasten the wear unit to the centrifugal wall of the respective centrifugal blade of the rotor.
• the hard metal part forms an effective abrasion protection, but due to its brittleness it is only suitable to a much lesser extent as a rebound protection and wears out relatively quickly.
• a centrifugal edge wear unit for a centrifugal mill which comprises a composite casting element, with at least one hard cast area which is exposed radially outwards in the assembled state and at least one soft cast area designed for attachment to the centrifugal mill, and which furthermore comprises at least one of the Composite casting element comprises separately manufactured wear element, which is received in a recess of the composite casting element.
• through-openings can be made in a simple manner, for example by drilling, by means of which the fling edge wear unit can be fastened to the flinger, for example by means of screw bolts. If desired, an internal thread can also be cut into an opening or bore made in the soft casting area become. However, it is also the use of one with the. Bolting cooperating nut possible.
• the hard cast area of the composite casting element that is exposed radially outwards in the assembled state provides effective rebound protection against the material moving back radially inward from the impact wall. Due to the fact that the hard cast area, despite its hardness, is more elastic and not as brittle as that conventional hard metal element used as rebound protection, it can better withstand the impact stress caused by the rebounding regrind.
• the centrifugal edge wear unit according to the invention comprises a wear element which is manufactured separately from the composite casting element and which has the actual centrifugal edge of the wear unit.
• This wear element can be a hard metal part, for example, so that it is ensured that the wear element according to the invention has the same abrasion resistance as could be achieved when using the conventional sling edge wear unit.
• the recess can be subsequently worked into a soft casting area of the composite casting element.
• This subsequent incorporation can take place, for example, by milling or eroding, which poses no problems as a machining operation, since only soft casting material needs to be machined.
• the recess can also be at least partially arranged in a hard casting area of the composite casting element.
• the last-mentioned variant also has the advantage that the additional step of milling or eroding the recess can be dispensed with.
• the milling or eroding of the recess has however, the advantage that the training can be made more precise, ie according to tighter manufacturing tolerances.
• the wear element can be clamped or / and glued into the recess.
• the recess can first be thermally widened and then cooled again after inserting the wear element, whereupon it contracts and, with appropriate dimensioning of the recess or wear element, holds the wear element securely.
• the wear element is glued into the recess, dimensional deviations between the recess and the wear element can be compensated for in a simple manner.
• a plurality of wear elements can be inserted into one and the same recess to facilitate the manufacture of the wear elements and to simplify the storage.
• the centrifugal edge wear units of centrifugal mills with different rotor heights can be manufactured in a simple manner by equipping them with a different number of wear elements.
• the composite casting element comprises a main section in which the recess is provided for the at least one wear element, and a lateral extension which is designed for attachment to the centrifugal mill. It is advantageous to avoid the formation of cracks in the transition area between the main section and the approach if the approach is made of soft cast material and is connected to a soft cast area of the main section.
• Fig. 1 a Schleuderka ⁇ ten wear unit according to the invention in its freshly installed in a centrifugal mill.
• a centrifugal edge wear unit according to the invention is generally designated 10.
• the wear unit 10 is fastened to the radially outer end of a centrifugal blade 14 of the rotor of the centrifugal mill 12.
• a material bed 1 6 of regrind is formed, along the surface 1 6a of which regrind particles 1 8 are accelerated toward the centrifugal edge 20.
• the regrind particles 18 have moved past the centrifugal edge 20, i.e.
• the regrind particles 18 After the regrind particles 18 have emerged from the rotor of the centrifugal mill 12, they move in free flight to a baffle, not shown in FIG. 1, on which the main comminution takes place. At least a portion of the regrind fragments 22 comminuted by the impact wall again moves radially inward and strikes against the surface 24 of the wear unit 10 that is exposed radially outward.
• the wear unit 10 comprises a composite casting element 26 with a soft casting area 28 and a hard casting area 30 as the base body.
• the hard casting area 30 is in the radially outward direction exposed surface 24 adjacent portion of the composite casting 26 educated. It forms the impact protection against rebounding material fragments 22.
• a recess 32 is machined into the soft casting area 28, be it by subsequent machining of the soft casting section 28, for example by milling or eroding, or by inserting a corresponding core into the casting mold for producing the composite casting element 26.
• the strip 34 serving as a wear element is made of hard metal and is therefore particularly resistant to friction stress.
• an elongated extension 38 is formed on the side of the relatively voluminous main section 36 of the wear unit, in which both the hard cast area 30 and the recess 32 for the wear strip 34 are formed, which is preferably made of soft cast material and merges into the soft casting area 28 of the composite casting element 26. The latter prevents the formation of cracks in the transition region 40 during operation of the centrifugal mill 12.
• a through hole 42 is made, which is also provided with an internal thread 44 in the illustrated embodiment. This threaded bore 42/44 is used to fasten the wear unit 10 to the blade wall 14 by means of a screw bolt 46.

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Crushing And Pulverization Processes (AREA)
• Crushing And Grinding (AREA)
• Heat Treatment Of Articles (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
• Medicines Containing Material From Animals Or Micro-Organisms (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7663912

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Family Cites Families (3)

• 2000
  • 2000-11-20 DE DE10057434A patent/DE10057434A1/de not_active Withdrawn
• 2001
  • 2001-11-19 DE DE50114430T patent/DE50114430D1/de not_active Expired - Lifetime
  • 2001-11-19 EP EP01996431A patent/EP1335795B1/fr not_active Expired - Lifetime
  • 2001-11-19 JP JP2002542526A patent/JP3930804B2/ja not_active Expired - Fee Related
  • 2001-11-19 AT AT01996431T patent/ATE411107T1/de not_active IP Right Cessation
  • 2001-11-19 WO PCT/EP2001/013369 patent/WO2002040167A1/fr active Application Filing

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events