As the face progresses the immediate roof above.
Longwall roof support.
Cat longwall top coal caving ltcc roof supports allow m.
Roof supports for special applications.
A mining method in which very long rectangular blocks of coal are defined during the development stage of the mine and then extracted in a single continuous operation by an automated cutting head moving parallel to the coal face when the coal is cut the working area is protected by a movable powered roof support system.
Major falls in longwall gateroads have become more and more uncommon as pillar design practices have improved largely through empirical design practices such as that.
Following a conventional cut with a shearer to about 3 m 9 8 ft the roof supports move forward and allow the caving coal to fall via controllable caving shields onto a second conveyor mounted gob side.
This test program is the most extensive that has ever been.
Longwall has better resource recovery about 80 compared with about 60 for room and pillar method fewer roof support consumables are needed higher volume coal clearance systems minimal manual handling and safety of the miners is enhanced by the fact that they are always under the hydraulic roof supports when they are extracting coal.
The longwall top coal caving ltcc roof support allows mining to a total seam height of more than 10 m 33 ft by using a longwall shearer to cut the bottom 2 8 3 0 m 9 2 9 8 ft and then caving the top coal behind the roof supports onto a rear afc.
This type of longwall is in service for example at a mine in the hunter valley australia.
Longwall roof support design is no exception and mostly continues to be a product of this philosophy.
Adapted to the mining challenges faced by our customers today cat customized systems for longwall mining include hydraulic roof supports high horsepower shearers automated plow systems and armored face conveyors with intelligent drive technology controlled and supported by advanced longwall automation.
Joy powered roof supports for high capacity longwall applications are custom designed to meet your exacting cycle and operating requirements.
In seams with a longitudinal inclination of over 12 degrees the support collaborates with a conveyor stabilization a roof shield correction and dip lower section protection equipment.
Caterpillar has extensive experience in the design of roof supports for specific mining conditions.
Our longwall top coal caving ltcc roof supports allow mining of seams up to 10 m 32 8 ft.
