Luffing jib tower crane functional uses

From the perspective of the technical development of tower cranes, although new products are emerging one after another, and the new products have improved in terms of production efficiency, ease of operation, ease of maintenance and reliable operation, the technology of tower cranes has not fundamentally changed. Research on tower cranes is moving towards combined development. The so-called combined type is to take the tower body structure as the core, decompose the tower body into several parts according to the structural and functional characteristics, and then divide each part into several modules according to the serialization and generalization requirements and the modular system principle. According to the parameter requirements, appropriate modules are selected to form tower cranes with different technical performance characteristics to meet the specific needs of construction. The implementation of combined tower cranes will help speed up the development of tower crane products, save product development costs, and better serve customers.

Features
The boom types of tower cranes are divided into two types: horizontal type and pressure rod type. When the boom is horizontal, the load-carrying trolley runs luffing along the horizontal boom, and the luffing motion is balanced. The boom is longer, but the weight of the boom is larger. When the boom is of the pressure rod type, the luffing mechanism drags the boom to pitch and change its amplitude. The luffing motion is not as smooth as the horizontal type, but its dead weight is smaller.

The lifting capacity of tower cranes varies with amplitude. The product of lifting weight and amplitude is called load moment, which is the main technical parameter of this kind of crane. Through the slewing mechanism and slewing bearing, the tower crane has a large lifting height and a large inertial mass during rotation and walking, so it needs to have good speed regulation performance. In particular, the lifting mechanism is required to be fast for light loads, slow for heavy loads, and easy to install. The bit moves slightly. Generally, in addition to resistor speed regulation, eddy current brakes, frequency modulation, pole changing, thyristor and electromechanical combination are often used for speed regulation.