Method and apparatus for the connection of a rotary drum drive of a rotary furnace
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorPaul Kunath
Life of this patent
Estimating the term…
Abstract
A method and apparatus for connecting a rotary drum drive, particularly a rotary drum drive of a rotary furnace or kiln, after disconnection for a short time, and before standstill of the oscillating drum, features detecting the movement of the oscillating drum and connecting the drive motor at a turning point of the oscillation or upon agreement with the direction of movement and the driving direction.
Claims19
A method of reconnecting the armature of a motor to an electrical supply shortly after disconnection, in an installation in which the motor drives a rotary drum which undergoes damped oscillations after disconnection, and before the drum damps to a standstill condition, comprising the steps of:
- measuring the direction of movement of the oscillating drum;
- and
- reconnecting the armature to the supply upon detection that the drum is not moving in a direction opposite to the normal driving direction.
A method of reconnecting the armature of a drive motor to an electrical supply in an installation in which the drive motor has an energized field winding and the motor is coupled to drive a drum which undergoes damped oscillation about its axis of rotation upon deenergization of the armature, reconnection to occur shortly after disconnection and before the drum damps to a standstill condition, comprising the steps of:
- detecting the magnitude and direction of the voltage generated across the armature due to rotation thereof through the field of the field winding;
- and
- reconnecting the armature to the supply upon detection of a zero in the generated voltage.
An installation comprising:
- a rotary drum which undergoes damped oscillatory motion when a driving force is removed;
- a drive motor coupled to said drum and including an energized field winding and an armature, contactor means operable to connect and disconnect the armature and an electrical supply;
- apparatus for reconnecting said armature to the electrical supply after disconnection and before said drum damps to a standstill condition, said apparatus including
- a meter mechanism including coil means connected across said armature and energized by the voltage induced in said armature by said field winding and a movable member responsive to the energization of said coil means to define along a prescribed path;
- switch means disposed on said prescribed path at a point corresponding to a zero of the generated voltage and operated in response to said movable member moving to that point;
- and
- means operatively connecting said switch means and said contactor means to reconnect said armature upon operation of said switch means.
An installation comprising:
- a rotary drum which undergoes damped oscillatory motion when a driving force is removed;
- a drive motor coupled to said drum;
- and
- apparatus for connecting said drive motor to an energy supply, after disconnection, before said drum damps to a standstill, said apparatus including
- first means for detecting the direction of movement of said drum and generating a voltage whose magnitude corresponds to drum acceleration and whose direction corresponds to drum direction of movement;
- second means connected to said first means and responsive to a voltage null to provide an output signal;
- and
- third means connected to said second means and to said drive motor for connecting said drive motor to the energy supply in response to said output signal.
An installation comprising:
- a rotary drum which undergoes damped oscillating motion when a driving force is removed;
- a drive motor coupled to said drum;
- means measuring the direction of movement of the oscillating drum;
- and
- means reconnecting the motor to a supply upon detection that the drum is not moving in the direction opposite to the normal driving direction.
Dependencies are inferred from the claim text.