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    Shenyang crane maintenance factory: Crane knowledge simple science popularization

    Source: 2050us.com Release time: 2018/12/7 9:01:40

    An introduction to

    - Crane It is a multi action lifting machine that is vertical lifting and horizontal lifting heavy loads within a certain range, also known as cranes. It is mainly used for hoisting into articles, and with appropriate sling, it can also lift bulk materials and liquid materials.

    The working characteristic of a crane is intermittent movement, that is, the corresponding mechanism of taking action, moving and unloading in a working cycle is alternately working. Agencies are often in the state of starting, braking and working in opposite directions.


    Development history

    Ancient Chinese Ji g o is the prototype of jib crane.

    In Fourteenth Century, there appeared manpower and animal powered rotary jib cranes in Western Europe.

    In the early nineteenth Century, there appeared bridge cranes. The important wear parts of cranes, such as shafts, gears and spreaders, began to be made of metal materials and began to be driven by hydraulics.

    By the late nineteenth Century, steam driven cranes gradually replaced hydraulic powered cranes.

    Beginning in 1920s, due to the rapid development of the electrical industry and the internal combustion engine industry, all kinds of cranes powered by electric motors or internal combustion engines were basically formed.

    classification

    Cranes are usually divided into boom cranes and bridge cranes according to their structures.

    A, jib crane

    Jib cranes include tower cranes, gantry cranes, floating cranes, self propelled cranes, mast cranes made up of mast and boom, wall mounted cranes running along walls and deck cranes mounted on ship deck.

    The jib crane can move the heavy goods far away from the frame through the extended long boom, which is mainly used for the loading and unloading operation of vehicles and ships. There are two types of tilting tilting tilted and non pitching horizontal arms. The jib of the tilted boom crane is suspended under the pulley of the top of the boom, and the boom of the horizontal boom crane has a lifting trolley with sling.

    Jib cranes are generally capable of turning and moving heavy loads in a specific range through the hoisting of cranes and boom of cranes or the operation of cranes along the boom. The lifting capacity of this kind of crane is expressed by the rated lifting weight and the rated gravitational moment. The amplitude is the horizontal distance between the spreader and the centerline of the crane, and the lifting moment is the product of gravity and amplitude of the lifting object.

    A, bridge crane

    Bridge cranes include bridge cranes, Longmen cranes, delivery bridges and cable cranes. Cranes can also be classified according to their usage, driving mode and mobility.

    Bridge crane has horizontal bridge, which can lift heavy objects over the ground obstacles or complete certain technological operations. It is widely used in workshop and indoor and outdoor warehouses in machinery manufacturing and metallurgy departments. Overhead traveling cranes operate on overhead cranes, while other overhead cranes operate on ground tracks. The lifting trolley operates along the track of the bridge, and the working area of the rectangle can be obtained through the movement of the bridge frame and the lifting trolley. The main parameters representing such cranes are rated load and span.