How does a road header work?
Roadheaders are massive excavating machines fitted with a mounted cutting head which will mine out the caverns for both State Library and Town Hall stations.
Why are Roadheaders used?
Roadheaders can be used to create roadway cross-sections of any shape. To work the tunnel face, the roadheader is moved towards the face with the crawler tracks and the cutting head is set in motion. The face of the tunnel or roadway is then milled off in sections with the cutting head.
What is coal cutting machine?
A machine powered by compressed air or electricity that drives a cutting chain or other device so as to undercut or overcut a seam, or to remove a layer of shale.
What is Pillaring and retreat mining?
Retreat mining is the removal of pillars in the underground mining technique known as room and pillar mining. In the second phase, once advance mining has been completed, pillars are removed “on the retreat.” Removing or “pulling” pillars begins far from the entrance and proceeds toward the entrance.
What is VCR method of mining?
Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottom-up mining method that involves vertically drilling large-diameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut.
Who invented the coal cutting machine?
The first coal-cutting machine in America was invented after four years of work by Horace F. Brown, of Indianapolis, in 1873.
What is advance longwall mining?
As the title suggest, the advance longwall system mines the panel by advancing into the coal seam and simultaneously developing the parallel entries moving farther away from the main entry.
What is a longwall move?
Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–1.0 m (2 ft 0 in–3 ft 3 in) thick). The longwall panel (the block of coal that is being mined) is typically 3–4 km (1.9–2.5 mi) long and 250–400 m (820–1,310 ft) wide.
What kind of machine is a road header?
It is a piece of excavating equipment consisting of a boom mounted cutting head, a loading machine usually involving a conveyor and a crawler travelling track to move the whole machine forward into the rock face. The road header also includes separate part, multi purpose hydraulic cutting heads for increasing on excavators.
How are road headers used in the mining industry?
Road headers for mining are prepared with powerful, transverse cutter heads proven to give an unparalleled cutting performance in a wide range formation of rock. Mounted on an extremely robust hydraulic boom they are reliable, rugged, highly creative result for both development and direct production duties.
How long has alpine roadheaders been in business?
Alpine has been in the roadheader design, manufacture, and sales business for over 35 years. These days we focus on in-house refurbished continuous mining roadheaders as well as new machine offerings. Alpine offers technical project and machine consulting, machine customization, parts and service or all roadheaders.
Is the XCMG ebz135 a good roadheader?
XCMG Official Tunneling Roadheader Small Mining Roadheader EBZ135. EBZ135 roadheader is designed as compact structure, low body, low center of gravity. easy operation, good working performance. 1.