The 40 ton rail mounted container gantry crane steel structure generally adopts the box-shaped structure. To reduce the quality of the whole machine, a truss structure may also be adopted, but the production cost is high. The structure of the door hinge is different, and the “Π” type and “U” type are more often used. The rigid and flexible door legs of the “Π” type structure are in “Π” form. The transverse stiffness and the door of the two main beams are different. The strength and rigidity of the leg itself are achieved by the rigidity of the crossbeams of the door legs and the door legs. The "U" shaped door leg is achieved by the stiffness of the connection between the door leg and the lower leg of the door leg.
(1) Main beam structure. The main beam structure is of rmg crane composed of two box-shaped end beams that are framed on rigid and flexible legs. At present, deviatoric box girders are often used. In order to avoid the high stress zone caused by wheel pressure in the flange welds, the track section is welded with “T” steel and main beam face plates and load bearing webs. The main beam and the rigid leg are connected by high-strength bolts or welding methods, and the flexible leg is connected by hinge connection. For the convenience of installation, the connection between the main beam and the end beam is generally a high-strength bolt connection.
(2) The structure of the door leg. Rigid door legs and flexible door legs are box-shaped structures for medium and small span rail-mounted container gantry cranes. Both sides of the door legs are made of rigid door legs. In the case of the "Π" shaped door leg, the strength and stiffness in the direction of the cart are achieved by the rigid connection of the door leg and the top beam: the "U" shaped door leg is realized by the rigid connection between the door leg and the bottom beam, and along the trolley The strength and stiffness of the direction are achieved by the rigid connection of the main beam and the rigid door legs. For small and medium-span 40 ton gantry cranes, the deflection force of the door-to-door and main girders due to the non-synchronized carts on both sides is supported by the articulated connection of the rigid and rigid legs and the flexible legs of the main girder and the single-degree-of-freedom. For long-span cranes, the connection between the flexible leg and the main girder uses a three-degree-of-freedom hinged connection and a synchronization detection device is provided.
(3) Trolley structure. The running trolley structure differs depending on whether the hoisting mechanism is a wire rope reel type or a telescopic rigid frame type, and a box girder and a plate girder combined structure are generally adopted. The running trolley structure considers the arrangement of the hoisting mechanism and the trolley running mechanism to ensure that the mechanism can withstand the transmitted load while operating and has a certain rigidity. Cabs, electrical cabinets, anti-roll devices, cable festoons, etc. are all connected to the trolley structure.
(4) Auxiliary structure assistance. The structure includes the electric house structure and escalator, walkway, maintenance platform and so on located on the main beam side.
