Wear-levelling apparatus for cyclones

1. A wear-levelling apparatus, comprising:

an upper section defining an upper portion of a frusto-conical channel of a cyclone configured to receive material for delivery to a lower portion of the channel of the cyclone, the upper section having an axis;

a bearing assembly connected to the upper section; and

a lower section of a cyclone coupled to the upper section by the bearing assembly to permit rotation of the lower section about the axis of the upper section, the lower section defining a lower portion of the channel of the cyclone configured to receive the material from the upper portion for discharge toward an outlet of the cyclone.

2. The wear-levelling apparatus of claim 1 , wherein the bearing assembly comprises:

an upper race fixed to the upper section;

a lower race fixed to the lower section; and

one or more rolling elements between the upper race and the lower race.

3. The wear-levelling apparatus of claim 2 , further comprising: an actuator configured to drive rotation of the lower section.

4. The wear-levelling apparatus of claim 3 , wherein the actuator is a motor comprising an output pinion configured to engage the bearing assembly.

5. The wear-levelling apparatus of claim 4 , wherein the bearing assembly includes a lower race fixed to the lower section and having a plurality of teeth configured for engagement with the output pinion.

6. The wear-levelling apparatus of claim 4 , further comprising a mounting plate fixed to the upper section for supporting the motor.

7. The wear-levelling apparatus of claim 1 , further comprising a guard housing enclosing the bearing assembly.

8. The wear-levelling apparatus of claim 1 , wherein the lower section includes (i) a replaceable liner mounted on an internal wall thereof, and (ii) one or more sensors mounted in or near the replaceable liner that detect a thickness of the replaceable liner.

9. The wear-levelling apparatus of claim 8 , wherein the one or more sensors comprise an ultrasonic sensor.

10. The wear-levelling apparatus of claim 8 , further comprising a control unit operable to rotate the upper and/or lower section in response to a signal from the one or more sensors until the detected thickness of the replaceable liner at a point adjacent to the one or more sensors exceeds a minimum thickness.

11. The wear-levelling apparatus of claim 10 , wherein the control unit is operable to convey a service signal to a remote interface.

12. A cyclone comprising the wear-levelling apparatus of claim 1 and a control unit operable to control the rotation of the upper and/or lower sections of the wear-levelling apparatus.

13. A method of operating a cyclone to reduce wear thereon, the method comprising:

(i) providing a cyclone;

(ii) sensing a thickness of a section of the cyclone; and

(iii) rotating that section of the cyclone relative to another section of the cyclone about a common axis of the rotating section of the cyclone and another section of the cyclone using an actuator.

14. The method of claim 13 , wherein rotating one section of the cyclone relative to another section of the cyclone using an actuator includes sensing a thickness of a replaceable liner mounted on an inner surface of the section as the actuator rotates the section, and continuing to rotate the section until a sensed thickness exceeds a predetermined threshold.

15. The method of claim 14 , further comprising conveying a service signal to a remote interface when the section is rotated by a complete turn and no part thereof has a sensed thickness exceeding the predetermined threshold.