Tower cranes are divided into two categories: upper slewing tower cranes and lower slewing tower cranes. The bearing capacity of the former is higher than that of the latter. What we have seen in many construction sites is the tower crane with the upper rotary type, the upper lifting and the joint height. According to whether it can move, it is divided into walking type and fixed type. The tower body of the fixed tower crane is fixed and does not turn, and is installed on the whole concrete foundation, or on the X-shaped concrete foundation in the form of a bar. The fixed type is generally adopted in the construction of houses.

In order to ensure safety, the tower crane has good safety devices, such as limit devices such as lifting weight limiter, amplitude limiter, height limiter and load torque limiter, as well as travel limit switch, tower top signal lamp, Anemometer, windproof rail clamp, ladder guard ring, walkway guardrail, etc. Through the slewing mechanism and slewing bearing, the tower crane has a large lifting height and a large inertial mass for slewing and walking, so it needs to have good speed regulation performance. In particular, the lifting mechanism requires light and fast load, heavy load and slow speed. Bit fretting. In addition to the use of resistance speed regulation, eddy current brake, frequency modulation, pole change, thyristor and electromechanical combination are often used to adjust the speed.

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