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
  • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
  • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
  • B02C18/16—Details
  • B02C18/18—Knives; Mountings thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
  • B02C18/0084—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
  • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
  • B02C18/16—Details
  • B02C18/18—Knives; Mountings thereof
  • B02C18/182—Disc-shaped knives
  • B02C18/184—Disc-shaped knives with peripherally arranged demountable cutting tips or elements

Definitions

• the present invention refers to a rotor for a scrap shredder (waste, scrap materials, etc) including a supporting structure that carries a loading compartment and at least one rotor (positioned in a seat made in a loading compartment wall) designed to shred the scrap contained in the loading compartment, at least one pusher for pushing the scrap to be shredded against the rotor and means designed to move at the least one rotor and the at least one pusher.
• a rotor for a scrap shredder waste, scrap materials, etc
• a supporting structure that carries a loading compartment and at least one rotor (positioned in a seat made in a loading compartment wall) designed to shred the scrap contained in the loading compartment, at least one pusher for pushing the scrap to be shredded against the rotor and means designed to move at the least one rotor and the at least one pusher.
• the rotor normally consists of a cylindrical body that carries multiple pairs of blades, which protrude from the rotor and which interact with additional blades fixed to the two sides of the seat in which the rotor is placed.
• the blades of each pair normally occupy opposite positions on the rotor surface.
• Rotors for scrap shredders are known in which the blades consist of hard-material plates applied in an already known manner on tool holders carried by the rotor: these known rotors have some drawbacks, including the fact that the application (and the replacement) of such plates is a lengthy and expensive operation because it requires, for each plate, an accurate adjustment to bring it "into register" with the additional blades fixed to the sides of the seat in which the rotor is placed.
• the heat developed by friction during the scrap shredding heats (or overheats) the scrap during the shredding stage, altering (or being able to alter) its physical-chemical characteristics until it is brought to a melted or semi-melted state, with the consequent complete blockage of the shredder.
• Object of this invention is to develop a rotor for a scrap shredder able to avoid the drawbacks presented by the known rotors; this object is achieved by means of a rotor providing the characterising elements illustrated in claim 1.
• FIG. 1 shows schematically a perspective view of a rotor according to the invention, without blades
• figure 2 shows schematically the rotor of figure 1 with a body according to the invention (having a pair of blades) withdrawn from its seat and another body according to the invention partially withdrawn from its seat;
• - figure 3 shows schematically a perspective view of a body according to the invention
• - figure 4 shows schematically a cross section of the rotor made at the centerline of a body according to the invention
• figure 5 shows the cross section of figure 4, in which said body has been removed
• FIG. 6 shows a portion of the rotor sectioned along a plane passing through the rotor's axis of longitudinal symmetry.
• Figure 1 shows schematically a perspective view of a rotor 1 according to the invention, consisting of a cylindrical body (including a tang 2) the external surface of which has multiple ribs 3, parallel to one another, each of which incorporates a through hole 50, which also crosses the cylindrical body, in which a body 4 (figure 3), at each end of which a blade (41, 42) is made, is placed.
• the ribs 3 may be omitted and the through holes 50 are made only in the cylindrical body.
• the through holes 50 in which the bodies 4 are inserted are coplanar to one another and each through hole 50 is rotated relative to the adjacent through holes 50 so that the blades (41, 42) of the bodies 4 inserted in the holes 50 are offset from one another in a similar manner to the plates applied to known rotors.
• the distance between the axes of longitudinal symmetry of two adjacent through holes 50 is less than the sum of the radii of the holes themselves, which thus interfere in the central area creating a recess 53 (figure 4) which places two adjacent through holes 50 in communication with one another.
• the distance between the axes of two adjacent through holes 50 falls between about 85% and about 95% of the sum of the radii of the holes 50 and is preferably about 90% of this sum.
• the retainers 47 are not shown in figure 1.
• rotor 1 number and dimensions of the ribs 3, number and layout of the bodies 4 along the rotor 1, etcetera
• the structure of rotor 1 will not be discussed herein because it is similar to the structure of the known rotors and in any case it is extraneous to the invention.
• Figure 2 shows schematically the rotor of figure 1 with a body 4 withdrawn from the related through hole 50 and another body 4 partially withdrawn from the related through hole 50.
• Figure 3 shows schematically a perspective view of a body 4 according to the invention, which includes a tang 45, at each end of which there is a cylindrical body (43, 44) in the shape of a blade (42, respectively 41).
• the diameter of cylindrical body 44 is greater than the diameter of cylindrical body 43.
• the radius of the tang 45 of a body 4 must be less than the radius of the related through hole 50 by an amount greater than the difference between the sum of the radii of two adjacent through holes 50 and the distance between their axes of longitudinal symmetry.
• cylindrical body 44 contains a seat 46 in which the retainers 47 (figure 4) are engaged.
• Figure 4 shows schematically a cross section of the rotor 1 made at the centerline of a body 4; figure 4 shows the rotor 1 (sectioned), the adjacent rib 3 and the body 4, inserted in the through hole 50 and held in place by the retainers 47 consisting, in the embodiment described herein, of a screw - inserted in the seat 5 (figure 1) - which engages in the recess 46 (figure 3).
• the annular cavity 52 delimited by the sidewall of the hole 50 and by the tang 45 (the central part of which, removed, has been indicated in figure 4 with dashed lines) also belongs to the cooling system for the blades (41 , 42).
• Figure 5 shows the cross section of figure 4, in which the body 4 has been removed to show the section of the through hole 50, which includes three overlapping cylindrical areas with progressively increasing diameter: - a first cylindrical area 54, having a diameter substantially equal to (and in any case not less than) the diameter of the cylindrical area 43 of the body 4;
• the recess 53 present in the sidewall of the second area 55 of the hole 50, brings two adjacent annular cavities 52 into communication with one another.
• a body 4 is applied to the rotor 1 by inserting it in a hole 50 starting from its smaller- diameter area 43 until its area 44 comes in contact with the annular projection 57 which forms a surface connecting the second and the third area (55, 56) of the through hole 50 and by securing it using the retainers 47, inserted in the seat 5 adjacent to the through hole 50, which engage in the seat 46 present in the cylindrical body 44 belonging to the body 4.
• Figure 6 shows a portion of the rotor 1 sectioned along a plane passing through the rotor's axis of longitudinal symmetry.
• Figure 6 illustrates the axial hole 61 made inside the tang 2 of the rotor 1 and the multiple through holes 50 - each of which houses a body 4 - interconnected by the recesses 53, whilst it does not show the area of rotor 1 , opposite the area providing the tang 2, in which a further axial hole is made.
• figure 6 indicates with the relevant numerical references only one of the bodies 4, of the annular cavities 52 and of the recesses 53.
• the bodies 4, the annular cavities 52 and the recesses 53 illustrated in figure 6 do not feature the same form because they are rotated relative to the other.

Landscapes

• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Environmental & Geological Engineering (AREA)
• Crushing And Pulverization Processes (AREA)
• Paper (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34956770

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (1)

Family Cites Families (3)

• 2005
  • 2005-04-27 IT IT000757A patent/ITMI20050757A1/it unknown
• 2006
  • 2006-04-19 WO PCT/EP2006/003570 patent/WO2006114223A1/fr active IP Right Grant
  • 2006-04-19 DE DE602006002390T patent/DE602006002390D1/de not_active Expired - Fee Related
  • 2006-04-19 EP EP06724423A patent/EP1883476B1/fr not_active Not-in-force
  • 2006-04-19 AT AT06724423T patent/ATE405346T1/de active

Non-Patent Citations (1)

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