The PT7528 tower crane is a horizontal boom, trolley slewing, upward rotating, flat head self elevating tower crane. All three major institutions adopt variable frequency speed control; The variable frequency motor of the lifting mechanism is equipped with a built-in rotary encoder and frequency converter to form a closed-loop control, with zero servo anti fall protection function and ant speed slow positioning function suitable for PC engineering applications. The working speed can adapt to 0-100HZ. The lifting mechanism not only has the function of running at high speed under light load and low speed under heavy load, but also has the safety of automatic speed limit under overload. The slewing mechanism is driven by a torque motor and controlled by a frequency converter. The low-speed torque characteristics of the torque motor are combined with the vector control of the frequency converter to make the starting, torque control, and braking force control of the tower crane slewing smoother, faster, and more reliable; The double-sided rotating mechanism is symmetrically arranged and has a process to ensure the meshing accuracy between the small gear and the rotating support gear.

The standard section of the tower body adopts a laminated structure and is connected by a pin shaft; The boom length of the crane can reach 75 meters, and can also be combined with other boom lengths such as 70 meters, 65 meters, and 60 meters according to user requirements.

Solution:

The PT7528-18t tower crane is suitable for the lifting and installation of large building modules in PC construction due to its large working range, large load capacity, and smooth slow positioning function.

In the construction of a large-scale project in Yantai, a large proportion of PC modules were used. The overall elevation of the building was 160m, and the vertical distance from the center of the tower crane foundation to the attached wall was 5m. The final installation height of the tower crane was 180m.