Overall structure of the crane

  Crane boom extending through the outer heavy long arm can be carried to a place far from the machine base, for the vehicle, ship loading and unloading operations. There may be pitching arm tilting and non-tilting level two. Tilt jib crane spreader boom top pulley hanging below the horizontal  jib crane  jib crane on a trolley with a spreader. Slewing jib cranes generally by crane slewing and luffing jib crane or trolley runs along the jib, so heavy to move within a certain range. Such lifting capacity of the crane jib minimum amplitude in the rated capacity and rated lifting moment to represent. Slewing crane spreader from the amplitude of the horizontal distance from the centerline, lifting goods lifting moment is gravity and magnitude of the product.

    Bridge crane with a horizontal bridge, to cross the obstacles on the ground lifting heavy objects or complete certain process operation. It is widely used in machinery manufacturing and metallurgical sectors such as workshops and indoor and outdoor storage. Overhead  hoist gantry crane  in orbit, the other bridge crane in the ground track. Lifting trolley tracks run along the bridge frame. Through the bridge and crane trolley movement gained rectangle (sometimes ring) operating range. Characterization of these cranes' main argument is the nominal weight and span (crane orbit two centerline distance between the rails).

    Many types of cranes, but its main components are included hoisting mechanism, operation mechanism, luffing and slewing mechanism, and metal structures. Some cranes have completed a certain process operation special equipment, such as cranes clamp clamp.

① lifting mechanism: Cranes basic body of work, mostly by hanging system and winches composition, but also through the hydraulic system lift heavy objects. Hanging system generally consists of wire rope, pulley block (see lifting tackle) and spreader composition, is the most common hook spreader. Lifting winch can be placed in a small car, can also be placed in the crane metal structures on or near the ground, through the retractable rope and lifting heavy objects, sometimes used as a manual hoist electric hoist or lifting mechanism. Some crane hoisting mechanism comes deputy for lifting light weights or auxiliary operations.

② run institutions: to adjust the vertical or horizontal transport of heavy cranes working position, generally consists of motor, reducer, brake and wheel components. Modern cranes, two wheels are usually driven by a separate drive mechanism may also be used by the motor, reducer and brake combined into one "triple play" approach. Lifting trolley body composition and operation of the crane mechanism similar to the horizontal transport of heavy loads or adjust the lateral position of the car. Most cars are self-propelled, that is itself a belt drive; sometimes in order to reduce car weight, may also rope traction, that the drive mechanism mounted on one end of the horizontal arm or bridge.

③ luffing mechanism: Only on the  overhead bridge crane  was equipped with. Amplitude decreases when the jib looked up, bent over when the amplitude increases. According to the performance requirements can be divided into equilibrium and non-equilibrium luffing luffing two kinds. According to operational requirements can be divided into sex work and non-work luffing luffing two kinds. Balancing Change (also known as level luffing) are: luffing jib system during heavy objects can move along a horizontal or nearly horizontal, center of gravity of the boom system unchanged or move along a horizontal line. Using this system can reduce the energy consumption of Change

Enable smooth and reliable operation. Unbalanced Change (also known as non-horizontal amplitude) is generally the center of gravity and the luffing jib when the center of gravity of the weight to be increased or decreased, jib amplitude decreases when the drive power consumption of large amplitude increases will cause a larger inertial load. Workability is luffing crane luffing under load, the general equilibrium amplitude, non-work luffing crane luffing in no-load conditions, the general non-equilibrium amplitude.

④ rotating mechanism: for the boom swing by the drive and slewing device component. Drive means to drive the rotation part of the rotary crane, slewing crane rotating part of the device that supports the non-rotating part.

⑤ metal structure: It is the skeleton of the crane. Various types of cranes has a different structure. Main bearing parts such as bridge, arm and the door frame may be box-shaped structure or a truss structure, the web structure may be. Some can be used as a steel support beam. The size and weight of the metal structure representing the crane dimensions and a large portion of the total weight. To ensure the strength, stability and rigidity, which is to ensure the metal structure does not damage, does not produce excessive deformation and vibration conditions, to minimize the weight of the structure.

    The basic parameters of the crane are nominal weight, the most significant, the maximum lifting height and working speed. These parameters are specified important basis for hoisting technology solutions.