·Commonly drag line operations are used to remove overburden from mines dismantle and transport materials Where are draglines used Dragline excavators are used in surface mining and coal mining however some may be used on large civil engineering sites such as road or port constructions to move overburden and other materials
A coal mining "drag line" machine in an open pit mine consumes MVA at a power factor lagging when it digs coal and it generates delivers to the electric system MVA at a power factor leading when the loaded shovel swings away from the pit wall At the end of the "dig" period the change in supply current magnitude can
·4 DRAGLINE The dragline is a typical combined cyclic excavator and material carrier since it both excavates material and dumps it without the use of trucks or conveyor belts The dragline sits above the waste or overburden block usually 50m or so wide on the highwall side and excavates the material in front of itself to dump it on the low wall or spoil side of the
·Kentucky Coal Heritage Mining Equipment Draglines Draglines The first dragline ever produced was equipped with a two line bucket system John W Page of the Chicago based firm of Page & Shnabel is credited with building it in 1903 Homestead Mine The first of the Marion 8800 series of draglines and the first to break the 100 cu yd barrier
2 ·Cat® draglines offer the lowest material removal cost per ton consume less power and emit fewer greenhouse gases than other methods of overburden removal making them the most productive and environmentally friendly excavators in the industry The Cat® 8750 is our flagship model It s the first dragline of any kind to be successfully equipped with AC IGBT drive
·Hence a drag line Add a scoop to this pull rope and you have a simple dragline excavator A man or a group or men could pull a small scoop but the amount of scooped contents would not be worthwhile Peabody Coal Company was one of the first companies to purchase this dependable machine One of the first was built at Ken Mine to be used
·In this method a coal rib is left during the extraction of the coal seam and the waste material is dumped behind the rib thus creating the dragline dump
tions The motor family is suitable for drag lines with bucket capacities ranging from 10m³ to 122m³ Motors are coupled to a common gear case to meet the power demands of each motion Their inter changeability simplifies spare parts manage ment These motors were designed with a special emphasis on longevity and high efficiency
·Given the amount of coal still to be mined the water was drained out and both the river and nearby canal re diverted around the site It is one of only four remaining drag line excavators in the world still in existence Weighing a massive 1 220 tons it is the size of 60 double decker busses and has a bucket capacity of 20 cubic yards 2
1 ·Draglines meant for the removal of overburden above coal or for tar sand mining are amongst the largest vehicles ever constructed These machines are purpose built and rarely leave the excavation site Draglines of this magnitude are mobilized by walking feet which pick up and replace the dragline a couple yards at a time; caterpillar tracks
·burden and rate of coal exposed by the dragline [] The 8 operation of draglines in tandem is advantageous in reducing cycle time and idle marching time Besides coal dilution is minimized and exposure as well as recovery is maxi mized Also the loss of coal in the ribs is reduced and safer working conditions exist near the rib side [9 ]
·Queensland 55% and NSW 42% produce the most black coal with locally significant operations in Western Australia South Australia and Tasmania Figure 1 shows the black coal locations in Australia Figure 2 indicates the Australian electricity ge neration by fuel in 2008/2009 The major uses of Australian coal are
3 ·The Cat® Card is the quick convenient way to get the parts and services you need for your equipment Discover ways this unsecured line of credit can help your business or fill out the application in just 5 7 minutes
·Bear Run will be the largest coal mine in the eastern United States initially operating two draglines to move rock and reveal coal seams Mined areas are ultimately restored to productive
·Coal India Limited India Received March 24 2016 Abstract—This paper discusses about the robust machine Dragline from century old techniques Figure 5 shows a single line diagram of one of four hoist drag propel swing blocks of a dragline with AFE We cannot construct all AFEs with ideal IGBTs and hence in practical conditions
Honoree Big Muskie 4250W Presented By SMIM Board for special recognition The Big Muskie was a singular engineering and manufacturing feat in world history The massive 4250W dragline was the world s largest earth moving machine created to the time and still holds the record for the largest single bucket excavator ever created
·Adhering to the high quality characteristics of SANY products SANY drag conveyor features full spectrum easy matching super wear resistance high reliability soft start and self diagnosis with the coal throughput far exceeding
Posted 1/31/2010 13 21 #1050656 in reply to #1050481 Subject Re Cheif Ironside makes his move Drag line excavator NE SD His reasoning was actually the amount of water the coal has in it I think for that specific mine
·11 45 CENTER AP A $38 million dragline named Liberty by area students is nearly ready to start work in helping mine coal south of here
A coal mining "drag line" machine in an open pit mine consumes MVA at a power factor lagging when it digs coal and it generates delivers to the electric system MVA at a power factor leading when the loaded shovel swings away from the pit wall At the end of the "dig" period the change in supply current magnitude can
·underground coal pillars by buffer blasted highwalls These industry changes have resulted in the need to re examine the manner in which geotechnical engineering is applied to highwall design This paper proposes a geotechnical design rationale for open cast highwalls Furthermore the rationale takes cognizance of
·Shareholders of coal mines typically want an operation with low capital and low cash operating costs; but also want to maximise value in discounted cash flow terms with known risk Draglines typically can offer a low cost waste removal mining method but are less flexible and have a higher capital cost Truck/shovel fleets on the other hand are
·When metalurgical coal prices spiked in 2011 many coal companies set in motion investments in infrastructure but was it too much too late An 8 million pound dragline crane Mr Tom will be in
·coal more attractive and the price soared from $20 per ton to $60 at one point Bituminous production hit a post World War II peak of 89 million tons in 1979 and the industry employed 39 000 workers However tumbling oil prices in the 1980s coupled with numerous other economic and regulatory factors brought recession to the state s coal
