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Let us konw more about mobile tower crane
"Mobile tower crane" means a tower crane which is mounted on a crawler, truck,similar carrier for traveltransit.
The most basic type of mobile tower crane consists of a steel trusstelescopic boom mounted on a mobile platform, which may be rail, wheeled (including "truck" carriers)caterpillar tracks. The boom is hinged at the bottom,can be raisedlowered by cablesby hydraulic cylinders. A hook is suspended from the top of the boom by wire ropesheaves. The wire ropes are operated by whatever prime movers the designers have available, operating through a variety of transmissions. Steam engines, electric motorsinternal combustion engines (IC) have all been used. Older cranes'''''''''''''''''''''''''''''''' transmissions tended to be clutches. This was later modified when using IC engines to match the steam engines "max torque at zero speed" characteristic by the addition of a hydrokinetic element culminating in controlled torque converters.
The operational advantages of this mobile tower crane arrangement can now be achieved by electronic control of hydrostatic drives, which for sizeother considerations is becoming standard. Some examples of this type of crane can be converted to a demolition crane by adding a demolition ball,to an earthmover by adding a clamshell bucketa draglinescoop, although design details can limit their effectiveness.
To increase the horizontal reach of the hoist, the boom of the mobile tower crane may be extended by adding a jib to the top. The jib can be fixed or, in more complex cranes, luffing (that is, able to be raisedlowered). Big tower crane with retractable boom, winchlots of authentic detials.
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