Impact mill

• US 8,474,738 B2
• Filed: 05/15/2006
• Issued: 07/02/2013
• Est. Priority Date: 05/20/2005
• Status: Active Grant

• Current Assignee: Fractivator Oy
• Original Assignee: Fractivator Oy
• Inventors: Virtanen, Pentti
• Primary Examiner(s): Francis, Faye
• Application Number:
  US11/919,664
• Publication Number:
  US 20110168821A1
• Time in Patent Office: 2,605 Days
• Field of Search: 241/187, 241/188.1, 241/188.2
• US Class Current: 241/187
• CPC Class Codes: B02C 13/205 arranged concentrically
• CPC Class Codes: B02C 13/24 arranged around a vertical axis
• CPC Class Codes: B02C 13/30 Driving mechanisms
• CPC Class Codes: F16H 37/0833 with arrangements for dividing torque between two or more intermediate shafts, i.e. with two or more internal power paths F16H3/72 takes precedence

Abstract

An impact mill equipped with transmission machinery (10) to rotate two coaxial rotors (16, 18) of a rotor apparatus (12) by one single driving apparatus (14). The transmission device includes, according to one alternative, a secondary shaft (32; 36b) equipped with a gear pair (28, 30) or a conic gear (29). The first gear (28) rotates a gear (24) at the shaft (20) of the first rotor (16), and the second gear (30) rotates a gear (26) at the shaft (22) of the second rotor (18), but in the opposite direction or at a different speed. The conic gear (29) rotates the gear (24a) at the shaft (20) of the first rotor (16) in one direction, and the gear (26a) at the shaft (22) of the second rotor (18) in the opposite direction.

Claims

1. An impact mill, comprising

a driving apparatus,

a rotor apparatus comprising two coaxial rotors with shafts wherein

a first rotor is equipped with blades having impact surfaces and which blades form one or more rings coaxial with said first rotor, wherein said rings are located at different distances from a rotational axis of said rotor,

a second rotor is equipped with blades having impact surfaces and which blades form one or more rings coaxial with said second rotor, wherein said rings are located at different distances from a rotational axis of said rotor, and

the rings of the first and second rotor are arranged in an intermeshed fashion,

wherein the shaft of the second rotor is fitted inside the shaft of the first rotor,

wherein the impact mill further comprises transmission machinery arranged to distribute rotating motion generated by the driving apparatus to the shafts of both of the rotors to rotate the same, said transmission machinery comprising

a secondary shaft equipped with a conic gear, wherein said secondary shaft is driven by the driving apparatus directly, and wherein the conic gear at said secondary shaft is arranged to rotate a conic gear at the shaft of the first rotor in one direction and the conic gear at the shaft of the second rotor in an opposite direction of rotation, and

wherein said driving apparatus is a single motor.

2. The impact mill of claim 1, wherein the first and the second rotors are arranged in a housing.

3. The impact mill of claim 1, wherein the shafts of the rotors extend from the centre of the rotors in the same direction.

4. The impact mill of claim 1, wherein the first rotor is equipped with blades having impact surfaces, and which blades form at least two rings coaxial with said rotor, and the second rotor is equipped with blades having impact surfaces and which blades form at least two rings coaxial with said rotor.