US 9,809,393 B2
Controlling a conveyor in a mining system
Gareth Rimmington, Barnsley (GB)
Assigned to Joy MM Delaware, Inc., Wilmington, DE (US)
Filed by Joy MM Delaware, Inc., Wilmington, DE (US)
Filed on May 8, 2015, as Appl. No. 14/707,007.
Prior Publication US 2016/0325940 A1, Nov. 10, 2016
Int. Cl. B65G 43/00 (2006.01); B65G 23/44 (2006.01); E21F 13/06 (2006.01)
CPC B65G 43/00 (2013.01) [B65G 23/44 (2013.01); E21F 13/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A conveyor for a mining system, the conveyor comprising:
a first sprocket having a first position;
a second sprocket having a second position, the first position being separated from the second position by a distance;
a chain associated with the first sprocket and the second sprocket, the chain having a top chain portion and a bottom chain portion;
a drive mechanism coupled to one of the first sprocket or the second sprocket, the drive mechanism operable to drive the one of the first sprocket or the second sprocket;
a sensor operable to generate a first signal related to a characteristic of the drive mechanism;
a load cell operable to directly measure a reaction force of the one of the first sprocket or the second sprocket and generate a second signal related to the reaction force of the one of the first sprocket or the second sprocket;
a hydraulic cylinder; and
a controller including a processing unit and a non-transitory computer readable data storage medium, the controller configured to
receive the first signal from the sensor,
receive the second signal from the load cell,
calculate a tension of the top chain portion based on the first signal and the second signal, and
generate a control signal for controlling a position of the hydraulic cylinder based on the determined tension of the top chain portion to control the distance between the first sprocket and the second sprocket.