introduction
Tower crane is a rotating crane whose boom is mounted on the top of the towering tower. It is mainly used for vertical transportation of materials and component installation in construction of multi-storey and high-rise buildings. It is composed of metal structure, working mechanism and electrical system. The metal structure includes tower body, boom, base, attachment rod, etc. The working mechanism has four parts: lifting, luffing, turning and walking. Electrical system includes motor, controller, distribution frame, connecting circuit, signal and lighting device, etc.
Tower cranes are divided into two types of rotary and rotary:
First, rotary tower crane: the tower body does not rotate, the swing arm above the slewing support, the balance arm, etc., through the slewing mechanism around the center line of the tower body for full rotation. According to the requirements of use, it is divided into running type, fixed type, attachment type and internal climbing type. Running tower crane can run along the track, working range is large, widely used, suitable for multi-storey building construction; If the base of the crane is fixed on the track or the tower body is directly fixed on the basis of the fixed tower crane, the boom is longer; Such as in the fixed tower crane tower every other certain height with attached rod connected with the building, that is, attached tower crane, it uses tower height device to make the upper part of the crane rotation can be increased with the building and the corresponding increase, for high-rise building construction; The crane is installed in the elevator shaft or connected holes, the use of hydraulic cylinder to make the crane according to the construction process along the shaft upward climb is called the internal climbing tower crane, it saves part of the tower, the service range is large, does not occupy the construction site, but the structure of the building has certain requirements.
Two, the next rotary tower crane: the slewing bearing is installed between the base and the turntable, in addition to the walking mechanism, other working institutions are arranged on the turntable together. In addition to the track type, there are track type and wheel type with track chassis and tire chassis as the walking device. It has low center of gravity, can be disassembled and transferred as a whole, lightweight and flexible, widely used, suitable for multi-storey building construction.
