Cranes basic institutions and basic common sense

A variety of different purposes lifting, structurally very different, but all have the basic actions to achieve lift lifting mechanism. Some also have run institutions crane, luffing mechanism, slewing mechanism, or other special working bodies. Materials by rope or lifting chain hanging a flexible member such movements, but also by a screw or other rigid pieces jacking.
 A) general structure of lifting large complex organizations, to complete the lifting movement, horizontal movement. For example,wire rope hoist to complete the lifting crane, dolly carts run and run three sports; portal cranes can complete hoisting, luffing, slewing and carts run four movements. In the working process, often several different directions of motion simultaneously, greater technical difficulty.
      2) lifting the lifting of heavy objects varied load varies. Some heavy objects weighing several hundred tons or even thousands of tons, and some objects up to tens of meters, irregular shape, with scattered granules, hot melt state, inflammable and explosive dangerous goods, etc., lifting process is complex and danger.
      3) Most of lifting machinery, you need to operate within a larger space, and some want to install rails and wheels (eg cranes, bridge cranes, etc.); some should be fitted with tires or caterpillar walking on the ground (such as cars cranes, crawler cranes, etc.); others need to walk on a wire (such as passenger, cargo ropeway), larger space, once the effects of the accident caused by a range of well.
    4) Some lifting carriage of persons in need rails, platforms or rope to do lifting movement (such as elevators, lifting platforms, etc.), which directly affects the reliability safety.
      5) Lifting exposed, moving parts are more often associated with lifting operations and personnel in direct contact (eg hook, wire rope, etc.), a potential risk factor for many sporadic.
      6) operating environment is complex. From large-scale iron and steel enterprises to modernize ports,hoist equipment construction sites, railway hubs, tourist attractions, there are lifting machinery in operation; workplaces often case temperature, high pressure, flammable, transmission lines, magnetic and other risk factors , for equipment and operating personnel a threat.
      7) Lifting operations often require more than one match, jointly conducted. An operation requiring command, strapping, driving and other operations personnel with skilled, motor coordination, mutual care. Workers should have the ability to deal with on-site emergencies. More close cooperation between workers, usually there is a big difficulty.
      Lifting of the work characteristics, determine its relationship with great safety. If lifting the design, manufacture, installation and maintenance of such links is the slightest negligence may cause injury or equipment accidents. On the one hand causing casualties,lever hoist the other, will cause great economic losses.