Lifting height also called hook height is the vertical distance from the surface of the concrete foundation of the tower crane (or walk the top surface of the track) to hook. On the trolley tower crane, its maximum lifting height is immutable, the pitch luffing tower crane, its amplitude varies with different lifting height, lifting height than the minimum amplitude high top tens m, so the pitch luffing tower crane has an advantage in starting the lift. Tower crane lifting height includes two parameters, lifting height of one tower installation free height, the second is the maximum lifting height of the tower crane attached when the tower crane when installing free height without attachment, usually tower crane It can reach 40 meters, to meet the needs of high-rise buildings below. In order to prevent the ultra-high tower crane hook lifting accidents and damage to the equipment, on each tower crane was equipped with a height limiter, when the hook rises to 1-2 meters away from the boom hoist is automatically cut off power to prevent the hook continue to rise. Working speed tower crane operating speeds include: Lifting speed, swing speed, varying speed. In the lifting operation, lifting speed is the most important parameter, especially in high-rise buildings, increase the lifting speed can improve work efficiency, and needs to slow when hanging objects in place, so from the big lift speed varies lifting performance superior performance. Lifting speed not only with the lifting mechanism, but also to override hook pulley about 2 to 4 times faster rope rope, single rope twice as fast than the 2 ropes. In the lifting operation, slewing, luffing, etc., which do not require excessive speed, but must be able to smooth starting and braking, to achieve stepless speed control, frequency control is ideal. Tail size, weight and components outside the gallery size. Slewing cranes under the tail size is determined by the rotational center of the turntable to the rear (including ballast blocks) maximum turning radius, slewing crane tail size is determined by the balance arm rotation axis to the rear (including counterweights) has a maximum radius of gyration. Tower crane tail size and impact of the tower crane installation and removal of the important parameters of the swivel job. The weight of the various components of the tower crane tower crane outside the gallery size is an important parameter in the transport, lifting of removal. 

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