Method and apparatus for the adjustment of a definite position of rest of a rotary tube
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsHelmut Duill, Jakob Ansen
Life of this patent
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Abstract
A method is provided for adjusting or setting a definite position of rest of a rotary tube, particularly of a tube mill, by switching off the drive of the tube and is particularly characterized in that, at a time T.sub.o, the angular position of the rotary tube, or of a drive part rotating with a tube, referred to a plane of comparison is established, that the idling movement of the tube is predetermined between disconnection and final standstill, and the angular position of the rotary tube and/or of the time T.sub.x at which the drive is disconnected is calculated and effected.
Claims6
A method of setting a definite standstill position of a rotary mill tube, without braking, upon switching off of the tube drive and subsequent inertial rotation of the tube, comprising the steps of:
- testing the switch-off-to-standstill condition to determine the amount of angular rotation therebetween;
- generating a reference time pulse prior to switch-off;
- delaying the reference time pulse by a predetermined time relating to the amount of angular rotation between switch-off and standstill to produce a desired angular position of the tube;
- and
- generating and applying a switch-off signal to the tube drive upon expiration of the delay time of the reference time pulse.
Apparatus for controlling the switch-off of the drive of a rotary mill tube to obtain a defined standstill position without braking, comprising;
- at least one switch means including a first portion carried on the tube and a second, stationary portion operable to generate a first pulse upon rotation of said first portion past said second portion;
- input means for generating first and second digital data representing a first angle of travel of the tube after shut-off of the drive and a second angle of travel of the tube from a reference in relation to a desired orientation of the tube at standstill;
- angular calculation means operated in response to said first pulse and said first and second digital data to emit a second pulse;
- a start-stop command circuit for selectively generating start and stop signals;
- and
- a control circuit connected to said angular calculation means and to said start-stop command circuit and connected to the tube drive, and responsive to a stop signal to produce a third pulse to deenergize the tube drive.
Dependencies are inferred from the claim text.