The picture below shows the shearer in mid face with a conveyor push following it towards the tailgate. Half-Web Cycle – Step 4 – Still Cutting Head to Tail
The full push will follow the shearer all the way to the TG until the entire conveyor is pushed. The picture below shows the longwall state when the shearer reaches the tailgate. Half-Web Cycle – Step 5 – Shearer in Tailgate
The coal face has two snakes but the shields are straight and the conveyor is completely pushed on the entire face. The longwall is in the same state as the Initial Position picture shown previously. The system is ready for the shearer to go back to the headgate and repeat the entire cycle.
Shearer Cleanup Problems If the shearer does not clean-up sufficiently to allow the shields to push to a full 100% stroke, the parameter “H->T Push Stroke” can be set to a lower value, such as 90%. In the above description, the phrase “completely push” or “full push” refers to this value. The tailgate pushes to this value as the shearer is cutting to the head, and the rest of the face will push to this value on the head to tail pass.
Full Web Cutting (Unidirectional) Full web cutting starts with the longwall in the state shown in the following picture: Full-Web Cycle – Initial Position
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