Structural features and specific applications of single-girder cranes: The crane is composed of a vertical pole, a rotating arm, a slewing drive device and an electric hoist. When the lifting equipment of a crane can be placed under the road surface or the top of the railway track, the distance at which it is lowered is called the lowering depth. That is, the safe distance between the lower working part of the hoisting tool and the horizontal support surface of the crane. The rotation of the telescopic boom of a crane is achieved through a drive mechanism and a slewing bearing device.
achieved through a drive mechanism and a slewing bearing device.Metal components are the frames of cranes. Key load-bearing parts such as cable trays, booms and gantry frames can be box-shaped structural components in a frame structure, or if they are beam-end structures, some can use channel steel as supporting beams. For the telescopic boom type crane, the rated lifting capacity of the flat boom crane varies with the force, and the lifting and hoisting characteristic index value is expressed by the lifting moment. The calibration value on the signboard indicates a relatively large lifting capacity.
The lower part of the column is fixed to the concrete base by bolts. The single beam is driven to rotate by a cycloidal pinwheel reducer. The electric hoist operates the I-shaped steel up and down in parallel within the single beam and performs lifting and hoisting. The single beam of the crane is of hollow steel frame structure, which is relatively light in weight, has a wide range, can lift a large capacity, and is economical, durable and long-lasting. It is equipped with an embedded lifting mechanism and adopts a unique engineering plastic wheel belt roller bearing, which has low friction, light movement, small size, and is especially helpful for improving the hook stroke arrangement.
