CHOPPING-GRINDING MILL

• US 20140326813A1
• Filed: 11/09/2012
• Published: 11/06/2014
• Est. Priority Date: 11/09/2011
• Status: Abandoned Application

• Current Assignee: Molinari S.R.L.
• Original Assignee: Molinari S.R.L.
• Inventors: Gervasoni, Giovanni Lorenzo
• Application Number:
  US14/357,047
• Publication Number:
  US 20140326813A1
• Time in Patent Office: Days
• US Class Current: 241/34
• CPC Class Codes: B02C 2201/04 for used tyres
• CPC Class Codes: B02C 25/00 Control arrangements specially adapted for crushing or disintegrating
• CPC Class Codes: B02C 7/08 with vertical axis B02C7/04 takes precedence
• CPC Class Codes: B02C 7/11 Details
• CPC Class Codes: B02C 7/12 Shape or construction of discs
• CPC Class Codes: D21D 1/303 Double disc mills

Abstract

A chopping-grinding mill for used objects and other waste materials includes a base, on which a disc-shaped vertical-axis rotor (2) is rotatably mounted, the rotor (2) having a plurality of cutting blades (5, 6) fixed to its upper surface. A disc-shaped coaxial stator (3) is associated with the rotor (2) and carries a plurality of cutting blades (II, 12) fixed to its lower surface. The stator (3) is fixed at an adjustable distance above the rotor (2), which together define a grinding chamber. Primary cutting blades (5, II) extend from the centre to the periphery of the rotor (2) and stator (3) and secondary cutting blades (6, 12) extend only in correspondence of a peripheral crown of the rotor (2) and of the stator (3), while a feeding window (10) of the material to be ground is provided in the stator (3), in the area inside to the peripheral crown.

Claims

1. Chopping-grinding mill for used objects and other waste materials, in particular for motor vehicle tyres, of the type comprising, in a single compact work unit, a base (1), whereon a vertical-axis rotor (2) is rotatably mounted, said rotor (2) having the shape of a disc carrying a plurality of cutting blades (5, 6) fixed to the upper surface thereof, to said rotor (2) a coaxial stator (3) being associated, in turn in the shape of a disc carrying a plurality of cutting blades (11, 12) fixed to the lower surface thereof, said stator (3) being mounted in a fixed position above the rotor (2) and at an adjustable distance therefrom so as to define therewith a grinding chamber of the material to be processed wherein said blades (5, 6;

11, 12) comprise primary blades (5, 11) which extend from the centre to the periphery of said rotor (2) and stator (3) and secondary blades (6, 12) which extend only in a peripheral crown of said rotor (2) and stator (3) and in that in said stator (3) a feeding window (10) of the material to be processed is formed which opens out, at least partly, on a grinding chamber area where exclusively said primary blades (5, 11) operate.

2. Chopping-grinding mill as claimed in claim 1, wherein the disc forming said rotor (2) has a sufficiently large thickness to impart to said disc, in addition to the support function of the cutting blades (5, 6) also the flywheel function.

3. Chopping-grinding mill as claimed in claim 1, wherein said cutting blades (5, 6;

11, 12) are arranged in a radial or subradial direction with respect to said rotor (2) and stator (3).

4. Chopping-grinding mill as claimed in claim 3, wherein said primary blades (5, 11) are angularly spaced out from each other by 30°

-90°

, preferably by 45°

-75° and

even more preferably by about 60° and

said secondary blades (6, 12) are spaced out from each other and from said primary blades (5, 11) by 5°

-15° and

preferably by about 10°

.

5. Chopping-grinding mill as claimed in claim 4, wherein the secondary blades (6, 12) being at a greater circumferential distance from the primary blades (5, 11) are of a greater length than the remaining ones.

6. Chopping-grinding mill as claimed in claim 1, wherein said grinding chamber comprises three annular grinding areas, which are subsequently crossed by the material to be ground, due to the action of the centrifugal forces acting on said material, with progressive reduction of the granulometry of the same.

7. Chopping-grinding mill as claimed in claim 6, wherein the final granulometry of the granular material is determined by the number, shape and arrangement of the secondary blades (6,12) and of the end of the primary blades (5, 11) arranged there between.

8. Chopping-grinding mill as claimed in claim 1, wherein said rotor (2) and stator (3) are made of steel and the inner surface of the grinding chamber formed between the same and the surfaces of the primary and secondary blades (5, 6;

11, 12) have a hardening surface coating, such as a layer of tungsten carbide.

9. Automatic feeder for a chopping-grinding mill of used objects and other waste materials, in particular motor vehicle tyre, as claimed in claim 1, wherein it comprises a pair of parallel-axes, side-by-side rollers (15, 16), mounted on a frame (13) made integral with said mill in correspondence of said feeding window (10), and in that the rotation axis of one of said rollers (16) is elastically movable with respect to the rotation axis of the other one of said rollers (15), in a direction (F) perpendicular to said axes.

10. Automatic feeder for a chopping-grinding mill as claimed in claim 9, wherein said movable rotation axis of one of said rollers (16) is under an elastic thrust force supplied by a pair of pneumatic actuators (17) acting on the opposite supports of the rotation axis of said roller (16).

11. Automatic feeder for a chopping-grinding mill as claimed in claim 10, wherein the operating pressure of said pneumatic actuators is equal to 2 bar.

12. Automatic feeder for a chopping-grinding mill as claimed in claim 9, wherein said rollers (15, 16) are moved by respective motors (M), the rotation speed of which is adjusted depending on the power consumption of the main motor (4) of the chopping-grinding mill whereon said feeder is mounted, so as to gradually reduce said rotation speed as said power consumption comes closer to a preset threshold value, and to stop when said value is reached or exceeded.

13. Automatic feeder for a chopping-grinding mill as claimed in claim 12, wherein the rotation direction of said actuation motors (M) is inverted for a preset period of time when the electric power consumption of said motors (M) exceeds a preset threshold value.

14. Automatic feeder for a chopping-grinding mill as claimed in claim 9, wherein inserts (18) projecting from the surface of said rollers, for accompanying/retaining the material fed, are further provided.

15. Automatic feeder for a chopping-grinding mill as claimed in claim 14, wherein rejection bars (19) are further provided in correspondence of the exit window (20) of the feeder, suitable grooves formed in said rejection bars allowing said inserts (18) to go through the same.