Portal crane boom system

Gantry  Steel crane  boom system is transmitted to the rotating platform to load the main components, can be made into single boom boom system or combination of systems.

Arm rack system: single boom luffing system is divided into rigid and flexible cable transmission amplitude of the arm frame. The former is characterized by the boom arm of the entire boom system is only rigid parts, as with weight balance system and a rigid arm drive means, which are arranged close to the luffing jib pull the root point, relying on the screw, screw drive achieve pitching arm. The second boom boom without balancing device luffing jib rope fixed on the head, relying on the income and the flexible cable release to achieve jib luffing.

Combination boom system: four-link portal overhead gantry crane  boom system is modular crane jib a typical pattern, it avoids some of the shortcomings arm frame body, so a combination boom system is widely used. And this combined with flexible arm can be divided into rigid cable type and cable type two.

1, the flexible cable type. It is the use of wire rope for the rod, and with the rear trunk frame geometry shape of the curve must achieve a level luffing movement of goods in the process. The whole structure lighter weight, but there are less rigid structure, rear rack and trunk cable connections easy to wear and other shortcomings. Previously in the small gantry  jib crane  lifting weight greater use in recent years has gradually been rigid rod replaced jib combinations.

2, the rigid rod combination arm. Rigid rod jib combination is determined by the trunk frame, rigid rod and hinge arm three part through the combination and makes up four-bar linkage with the rack in order to achieve a level luffing cargo movement process.