Method and apparatus for detaching frozen charge from a tube mill
AssigneeABB Schweiz AG
InventorsRobert Keller, Patrick Meier
Life of this patent
Estimating the term…
Abstract
A method and associated apparatus for detaching a frozen charge from an inner wall of a grinding pipe of a tube mill such as is used for grinding. The method includes controlling a driving device of the grinding pipe to detach a frozen charge from an inner wall of the grinding pipe, which driving device is operable to apply a driving torque to the grinding pipe. Controlling the driving device includes varying the driving torque applied to the grinding pipe around a predetermined reference level.
Claims20
A method for detaching a frozen charge from an inner wall of a grinding pipe, the method comprising the steps of:
- controlling a driving device of the grinding pipe to detach a frozen charge from an inner wall of the grinding pipe, which driving device is operable to apply a driving torque to the grinding pipe, wherein controlling the driving device comprises:
- varying the driving torque applied to the grinding pipe, wherein the driving torque is always positive so that the grinding pipe does not change its rotational direction while varying the driving torque.
A controller for detaching a frozen charge from an inner wall of a grinding pipe, the controller comprising:
- a controller operable to control a drive device of the grinding pipe to detach a frozen charge from an inner wall of the grinding pipe, which driving device is operable to apply a driving torque to the grinding pipe in one rotation direction so that the grinding pipe does not change its rotational direction, and vary the driving torque applied to the grinding pipe such that the driving torque is always positive so that the grinding pipe does not change its rotational direction about a predetermined and increasing torque reference level.
A method for detaching a frozen charge from an inner wall of a grinding pipe, the method comprising the steps of:
- controlling a driving device of the grinding pipe to detach a frozen charge from an inner wall of the grinding pipe, which driving device is operable to apply a driving torque to the grinding pipe, wherein controlling the driving device comprises:
- varying the driving torque applied to the grinding pipe between a minimum torque and a maximum torque, wherein the minimum torque is always positive, and the driving torque thereby preventing back-lash.
Dependencies are inferred from the claim text.