With longwall mining is a complex system understanding a few basic concepts will help to clarify the support design requirements.
Longwall mining roof support.
Roof support technology for longwall tailgates has changed dramatically during the past decade.
Becker mining systems is a leader in powered roof support manufacturing.
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.
Bmj is one of the worlds largest manufacturers of powered roof supports and the company delivers the incredible volume of approximately one complete longwall face per week.
Our longwall top coal caving ltcc roof supports allow mining of seams up to 10 m 32 8 ft.
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.
Ratings up to 1 750 tonnes widths of 1 5 1 75 and 2 05 meters.
In a longwall complex roof support shields cooperate with a heading shearer and a.
Roof supports for special applications.
They meet the stringent requirements regarding safety and ergonomics.
As the face progresses the immediate roof above.
Our powered roof supports are designed and manufactured according to the latest technical and technological solutions.
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.
This type of longwall is in service for example at a mine in the hunter valley australia.
Longwall mining equipment selection b face supports.
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.
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.
