Working principle of tire gantry crane :(1) crane lifting principle. Through the hydraulic cylinder to adjust the elevation Angle of the main arm, through the hydraulic motor to drive the drum to collect (put) steel rope, telescopic lifting arm, lifting hook to lift heavy objects. (2) Boom expansion principle. There is a rotating drum below the inside of the boom, which is wound with a wire rope. The wire rope is pulled out of the upper boom through the pulley on the top of the next boom, and so on. When retracting, the reel reverses to recover the wire rope, and the arm retracts under the action of dead weight. The structure of wheel type gantry crane.
The boom has truss type and box type telescopic two kinds. The latter uses a box structure with multiple sections set together. It can meet the different requirements of small volume of boom retraction when crane is running and large extension range when crane is lifting, so it becomes the preferred boom form of modern mobile hydraulic crane. Telescopic boom frame structure FfI basic arm, telescopic boom and additional arm composition, with the help of the zigzag hinge on the rotary platform, through the amplitude of the piston movement of the hydraulic cylinder to adjust the amplitude of the boom frame. During the lifting operation, the boom plane and the vertical boom plane are subjected to the combined action of pressure and bending. The crane boom must meet the requirements of strength, stiffness and stability, and is the most important bearing component of the crane.
The rotary platform is the supporting connection platform of each component of the vehicle, providing the articulated point of the boom and the movement constraints of each mechanism on the vehicle, bearing the lifting load and the weight of the vehicle part, and transmitted to the vehicle part through the rotary supporting device. The counterweight is set in the opposite direction to the boom suspension, playing a role of balance and stability. The frame is the basic structure of the whole crane as well as the identical frame connecting the driving device and the running mechanism of the whole crane. The stiffness and strength of the frame will directly affect the performance of the crane. The legs are installed on the frame. The legs are recovered when the crane is running, and extended and supported on a solid foundation when the crane is lifting. The pneumatic tire is raised on the air, forming a rigid support, providing a larger supporting area for the lifting operation and improving stability.