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
  • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
• • 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
  • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
  • B02C18/142—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers with two or more inter-engaging rotatable cutter assemblies
• • 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
  • B02C18/06—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
  • B02C2018/188—Stationary counter-knives; Mountings thereof

Definitions

• the present invention relates to an industrial shredder or comminution machine, designed to shred the most diverse materials such as plastic, rubber, paper and the like.
• European patent application EP 928 222 describes an industrial shredder comprising two shafts parallel to each other, generally rotating in opposite directions.
• Said shafts carry integral disc-shaped blades with one or more teeth formed on the outer profile of the blades, which can take different shapes, according to the particular use.
• Said blades pass through rectangular apertures formed in the tables which are situated, with suitable angles, between the side walls of the shredding chamber and the middle of the shredding machine.
• the walls of the rectangular apertures in the tables form a fixed contrasting element and thus act as counterblades, facilitating shearing or cutting of the material to be shredded.
• the object of the present invention is to overcome the drawbacks of the prior art by providing an industrial shredder that is able to ensure good efficiency and effective cutting.
• Another object of the present invention is to provide such an industrial shredder that is able to reduce idle times during operation to a minimum.
• Yet another object of the present invention is to provide such an industrial shredder that is cheap and simple to make.
• the industrial shredder comprises: - a fixed supporting structure, - at least one shaft mounted rotatably in said fixed structure and carrying a plurality of blades provided with cutting teeth, and - a first row of counterblades and a second row of counterblades mounted on said fixed structure on one side and the other with respect to said at least one shaft so that the cutting teeth of the blades cooperate with the counterblades to shear the material to be shredded.
• the main characteristics of the invention are represented by the fact that - the cutting teeth are disposed on said shaft in pairs, and - the blades of the first row of counterblades are disposed offset with respect to the blades of the second row of counterblades.
• each pair of cutting teeth one cutting tooth cooperates with a corresponding counterblade of the first row of counterblades and the other cutting tooth cooperates with a corresponding counterblade of a second row of counterblades.
• Said configuration of the shredder according to the invention makes it possible to obtain a considerable free area in the shredding surface through which the shredded material can pass. Furthermore, the material engaged by a blade always finds a corresponding counterblade against which it is sheared, reducing to a minimum the amount of unsheared material and the idle times for reversal of rotation of the shafts.
• Figure 1 is a perspective, exploded view of the industrial shredder according to the mvention
• Figure 2 is a perspective view of the fixed structure of the shredder of Figure 1;
• Figure 3 is a perspective view of the assembled shredder
• Figure 4 is a partially sectioned view of the shredder of Figure 3, taken along a horizontal plane passing through the axes of the shredder shafts;
• Figure 5 is a partially sectioned view of the shredder of Figure 3, taken along a vertical plane at right angles to the axes of the shredder shafts;
• Figure 6 is a perspective view illustrating an enlarged detail of two side-by-side blades of a shredder shaft according to the invention
• Figure 7 is a perspective view illustrating an enlarged detail of a group of three central inserts of the shredder according to the invention.
• the shredder according to the invention denoted as a whole with reference numeral 100, is described with the aid of the figures.
• the shredder 100 comprises a fixed structure, illustrated in Figure 2 and denoted as a whole with reference numeral 1. Two substantially similes shafts ( Figures 1 and 3) are mounted on the fixed structure.
• the fixed structure 1 comprises a basic frame 3, substantially rectangular in shape, provided with a central supporting bar 4 parallel to the longer sides 5 of the base frame 3.
• Two sides 6, substantially similar in shape, are mounted on the longer sides 5 of the base frame 3.
• Each side 6 has a side plate 7 which rises vertically from the longer side 5 of the base frame 3.
• each side 6 has an inward facing flat surface wherein a plurality of side inserts 9, arranged in a row side by side are mounted.
• each side insert 9 has a T-shaped top part 10 which acts as a counterblade and a rounded front part 11 on which the shaft 2 is supported and slides.
• a plurality of central inserts 13 is mounted on the central bar 4 of the fixed structure 1. As shown better in Figure 7, the central inserts 13 are grouped in threes on a base 14. Each insert has a first rounded top part 15 on which the shaft 2 is supported and slides and a second L-shaped top cutting part 16, inclined about 45° with respect to a horizontal plane.
• the three inserts 13 are offset from each other and disposed with the cutting parts inclined the opposite way. In this manner, the cutting parts 16 of the two side inserts form with the rear part of the cutting part 16 of the intermediate insert a substantially C-shaped slot when seen in a plan view. Ultimately, two rows of central inserts 13, opposite and offset with respect to the respective rows of side inserts 9, are obtained.
• each blade 18 comprises a cylindrical body 19 having an hexagonal through hole 20 axially, able to engage on a hexagonal profile 21 formed on the outer side surface of the shaft 2 ( Figure 1).
• the cutting tooth 22 has two opposed cutting beaks 23 and 24.
• Each cutting beak 23, 24 defines a substantially arched cutting surface.
• the first cutting beak 23 is higher than the second cutting beak 24. That is to say, the cutting beak 23 protrudes radially from the outer side surface of the blade body 19 more than the other cutting beak 24.
• each tooth 22 is about half the width W of the side surface of the blade body 19.
• the widths Wl and W are taken in the axial direction of the blade. Since the tooth 22 is disposed at one end of the side surface of the blade body 19, a free portion 25 of side surface of the blade body remains next to each tooth 22.
• the blades 18 are keyed on the hexagonal profile 21 of the shaft 2, so that alternatively the teeth 22 of the two adjacent blades are alongside each other and the free parts 25 of two adjacent blades are alongside each other. In this manner, pairs of side-by-side teeth 22 alternating with pairs of side-by-side free parts 25 are formed on the shaft.
• the wordings "pair of side-by-side teeth” and “pair of side-by-side free parts” genetically signifies that the blades 18 are mounted in such a manner that, in a pair of adjacent blades, the surface in which the tooth 22 is situated is alongside the surface in which the tooth of the adjacent blade is situated and the surface in which the free part 25 is situated is alongside the surface in which the free part of the adjacent blade is situated.
• the teeth 22 of a pair of side-by-side teeth could be angularly offset.
• the highest cutting beak 23 of a blade is advantageously on the same side as the lowest cutting beak 24 of the adjacent blade.
• the blades 19 are keyed on the profile 21 of the shaft 2 in such a manner that their teeth 22 follow a course substantially like a cylindrical helix.
• the radius of curvature of the supporting parts 11 and 15 is substantially similar to the radius of curvature of the blade body 19 and the side inserts 9 and central inserts 13 are disposed in such a manner that their curved supporting parts 11 and 15 have the same center of curvature which coincides with the axis of the shaft 2.
• the supporting parts 11 of the lateral inserts 9 are offset with respect to the supporting parts 15 of the central inserts 13.
• the thickness of the supporting parts 11 and 15 is equal to or slightly smaller than the width W2 of the free part 25 of the blade body 19.
• the lowest cutting beak 24 of a blade is situated on the same side as the highest cutting beak 23 of the adjacent blade, to limit the amount of material picked up by the highest cutting beak 23 during rotation of the shaft 2, so as to avoid excessive overloading of the machine.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=34509439

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (6)

Family Cites Families (2)

• 2003
  • 2003-10-09 IT IT001938A patent/ITMI20031938A1/it unknown
• 2004
  • 2004-10-06 AT AT04765851T patent/ATE370790T1/de not_active IP Right Cessation
  • 2004-10-06 WO PCT/EP2004/011159 patent/WO2005039774A1/en not_active Ceased
  • 2004-10-06 EP EP04765851A patent/EP1673171B1/de not_active Expired - Lifetime
  • 2004-10-06 DE DE602004008495T patent/DE602004008495T2/de not_active Expired - Lifetime
  • 2004-10-06 DK DK04765851T patent/DK1673171T3/da active

Non-Patent Citations (1)

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