The Introduction of the Structure of the Gantry Crane(Ⅱ)


 
The main longitudinal girder is made of two sets of triangle honeycomb girder, which are welded with steel panels and shape steel. The girders are connected to one another with the steel pins. There are steel rail on the beam, which is for the lifting trolley. Two main girders are fixed on the cross beam with the bolts.
2.People walking parts
For the convenience of the maintenance and protection of the gantry crane, there is a row of ladder assembled on the main longitudinal girder. There are protective guards on the people walking parts, through which the operators can go to the operating room or the people walking parts to maintain the crane.
The lifting trolley is made of the frame, hoist as well as the pulley block.
The frame is for the lifting trolley to bear stress and walk, which is welded with steel panels. Each side of the frame is equipped with one wheel box, in which there is one driving wheel box and one passive wheel box. Outside the wheel box are brake motor and the cycloid reducer, whose working principle is the same with the crane walking wheel.
The hoist is assembled on the top of the frame, which is the lifting mechanism of the trolley. Each hoist is equipped with a set of fixed pulleys and movable pulley. The fixed pulley is fixed on the frame and the movable pulley is hung under the trolley with the steel wire rope. The end part of the rope is winded on the shaft of the host.  When the hoist works, the pulley can go up and down, and the pulley is driven by the steel rope.