ROLL MILL

• US 20100193616A1
• Filed: 05/27/2008
• Published: 08/05/2010
• Est. Priority Date: 07/17/2007
• Status: Active Grant

• Current Assignee: Thyssenkrupp Polysius AG
• Original Assignee: Polysius AG (Thyssenkrupp AG)
• Inventors: Berger, Markus, Guerrero Palma, Pedro
• Granted Patent: US 8,262,006 B2
• Time in Patent Office: Days
• US Class Current: 241/30
• CPC Class Codes: B02C 15/006 Ring or disc drive gear arrangement
• CPC Class Codes: B02C 23/00 Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group specially adapted for grain mills B02C11/00; separating or sorting in general B03, B04, B07
• CPC Class Codes: B02C 25/00 Control arrangements specially adapted for crushing or disintegrating

Abstract

The invention relates to a roll mill having a grinding plate rotatable about an axis of rotation, at least one grinding roller in rolling engagement with the grinding plate, and a main drive for driving the grinding plate. An auxiliary drive for driving the grinding plate, and a regulating device are also provided, the regulating device including at least one damping regulator which regulates the auxiliary drive in dependence on torque variations of the main drive and/or variations in the speed of rotation of the grinding plate.

Claims

1. Roll mill having

a. a grinding plate (2) rotatable about an axis of rotation (1),

b. at least one grinding roller (3, 4) in rolling engagement with the grinding plate and

c. a main drive (5) for driving the grinding plate,

characterised in that at least one auxiliary drive (13) for driving the grinding plate (2), and a regulating device (15) are provided, wherein the regulating device includes at least one damping regulator (16, 21) which regulates the auxiliary drive in dependence on torque variations of the main drive (5) and/or variations in the speed of rotation of the grinding plate (2).

2. Roll mill according to claim 1, characterised in that the main drive (5) includes a planetary gear having sun wheel (6), planet wheels (7, 8) and ring gear (9), the ring gear being rotatably arranged and the auxiliary drive (13) being provided for driving the ring gear.

3. Roll mill according to claim 2, characterised in that the regulating device (15) regulates the auxiliary drive (13) in dependence on torque variations of the sun wheel (6).

4. Roll mill according to claim 1, characterised in that a frequency converter (18) is provided for regulating the auxiliary drive (13).

5. Roll mill according to claim 2, characterised in that the regulating device (15) includes a sensor (17) for detecting the torque of the sun wheel (6).

6. Roll mill according to claim 1, characterised in that the regulating device (15) includes a sensor (20) for detecting the rotation speed of the grinding plate (2).

7. Roll mill according to claim 1, characterised in that the regulating device (15) includes a state space controller.

8. Method of operating a roll mill according to one or more of the preceding claims, wherein the regulating device regulates the auxiliary drive in dependence on torque variations of the main drive 5 and/or variations in the rotation speed of the grinding plate 2, in order to damp the torque variations of the main drive (5) and/or the rotation speed variations of the grinding plate (2).

9. Method according to claim 8, characterised in that, to control the auxiliary drive (13), account is taken of the actual and a time-averaged torque of the main drive (5).

10. Method according to claim 8, characterised in that, to control the auxiliary drive (13), account is taken of the deviation in the rotation speed of the grinding plate (2) relative to a reference speed.

11. Method according to claim 8, characterised in that the torque measurement necessary for controlling the auxiliary drive (13) is effected via a high-dynamic angle of rotation measurement.

12. Method according to claim 8, characterised in that any braking energy of the auxiliary drive (13) that may arise is used for energy purposes.

13. Method according to claim 8, characterised in that the drive output required for driving the grinding plate (2) is provided by the auxiliary drive (13) in a proportion of 5 to 30%, preferably 10 to 20%.