Nepean longwall and.
Longwall mining roof support.
They meet the stringent requirements regarding safety and ergonomics.
In any underground mining activity the in situ vertical and horizontal stresses that exist in the.
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.
With longwall mining is a complex system understanding a few basic concepts will help to clarify the support design requirements.
Nepean longwall offers structures and hydraulic cylinders manufactured by bmj of china a manufacturer with an outstanding track record of design competence and manufacturing quality.
While it is frequently argued correctly that all items on a longwall face have to be considered as parts of an integrated unit and be fully compatible it cannot be denied that poorly designed and inadequate roof supports are likely to have a greater effect on results than other items and.
Longwall mining equipment selection b face supports.
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.
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.
Our powered roof supports are designed and manufactured according to the latest technical and technological solutions.
Ratings up to 1 750 tonnes widths of 1 5 1 75 and 2 05 meters.
Our longwall top coal caving ltcc roof supports allow mining of seams up to 10 m 32 8 ft.
Roof supports for special applications.
This type of longwall is in service for example at a mine in the hunter valley australia.
Roof support technology for longwall tailgates has changed dramatically during the past decade.
Joy powered roof supports for high capacity longwall applications are custom designed to meet your exacting cycle and operating requirements.
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.
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.
As the face progresses the immediate roof above.
