Longwall mining at Meiyukou colliery

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · World Coal; (United States)

OSTI ID:5750858

Designed to produce some 1,500,000 tons of coal per year, this 50-year-old colliery mined 2,000,000 tons last year; its target in 1979 is 2,100,000 tons. Twelve longwall faces are being mined at Meiyukou: eight are conventional faces using friction props with cantilever roof bars, some shearers and armored face conveyors; three are fully mechanized retreating faces having shearers, armored face conveyors, and self-advancing powered roof supports; and one is a retreat face from which, after working for eight months, equipment is being salvaged. The use of self-advancing roof supports is still comparatively new in China, and in this particular mine they are all of Chinese manufacture. Each chock is controlled individually and not by adjacent or batch control, as in many other parts of the world. Coal is cut and loaded by a Chinese double-ended ranging drum shearer, powered by two 85-kilowatt motors, giving a total power of 170 kilowatts. The maximum extraction height is 3 meters, but on a 220-meter-long face in the No. 12 Seam, only 2 meters is being taken with a shearing drum of 1.5 meters diameter fitted with radial picks and taking a web of 600 millimeters. Speed of shearing is 9.3 feet per minute. In view of the hardness of the coal it would appear that the shearer is grossly underpowered and more satisfactory outputs could be obtained if a more powerful shearer were introduced. However, three cuts per shift are obtained, and output per day averages about 1500 tons (or about 45,000 tons per month), working three shifts per day. Maintenance is carried out in half a shift. Productivity is on the order of 6 to 7 tons per man on the face.

• OSTI ID: 5750858
• Journal Information: World Coal; (United States), Journal Name: World Coal; (United States) Vol. 5:10; ISSN WOCOD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
ASIA
CHEMICAL REACTIONS
CHINA
COAL MINES
COAL MINING
COMBUSTION
CONVEYORS
CUTTER LOADERS
EQUIPMENT
GEOLOGY
HEADING MACHINES
LONGWALL MINING
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
MECHANICAL STRUCTURES
MINE HAULAGE
MINE ROADWAYS
MINES
MINING
MINING EQUIPMENT
OXIDATION
POWERED SUPPORTS
PRODUCTIVITY
SPONTANEOUS COMBUSTION
SUPPORTS
THERMOCHEMICAL PROCESSES
TUNNELS
UNDERGROUND MINING
VENTILATION