Used mainly for loading directly onto field conveyors or into hauling equipment the dragline is usually mounted on crawler tracks, the long side tracks reducing bearing pressure and increasing stability. The superstructure, comprising power unit, winches, cabin and boom rotate on this base. The machine is usually situated on a bank and is able to excavate material to a considerable depth below the bank depending upon boom length and slope angle. Owing to the length of the boom the machine is capable of extracting mineral over a larger area of ground than any other equipment. A skilled operator may even cast the bucket. The dragline can be operated 'wet' or 'dry' and can excavate soils, unconsolidated overburden, sand and gravel and well fragmented blasted rock although is not generally suitable for the selective recovery of thinly bedded materials e.g. soils. When excavating sands and gravel from below water level it is usual to create a stockpile to permit drainage before transfer to truck or conveyor.
- Roller Compacted Concrete Plant
Roller compacted concrete (RCC) is an extremely dry concrete which is very difficult to compact by the normal methods used for workable concrete. RCC is used for the construction of dams and pavements....
- Concrete Solution for AAC Block Plant
Aerated concrete block is an important kind of construction material and it is mainly composed of cement, gravel, fly ash, lime and foaming agent. It possesses the advantages of light weight, fire prevention, thermal insulation,noise insulation...
- Nuclear Power Concrete Production Line
Nuclear power project is less than hydropower project in concrete pouring volume, but compared with other projects, it still needs a large volume of concrete and its structure is more complex than hydropower project....
- Hard rock Crushing Plant
The following figure depicts the flowsheet for a plant producing various forms of dry (uncoated) roadstone including high PSV (+60) surface chippings. The produ...
- Sand and Gravel Processing Plant
A cone crusher is depicted as most suitable to crush very coarse rejects into the desirable size range of concrete aggregates. A ZS vertical shaft impactor may be used to increase the yield of sand....