2013年8月11日星期日

Crane drive and its structure (2)

General overhead crane used mainly electric drive, generally in cab control, there are also remote control. Weight of up to five hundred tons, span up to 60 meters.

Simple beam  bridge gantry crane  girder cranes, also known as its structure and composition similar to ordinary bridge crane, lifting weight, span and working speed are small. Bridge girder or other beam by beam and plate steel consisting of a simple cross-section beams, hand pull hoist or hoist trolley accompanied by simple as lifting trolley, trolley generally joist bottom flange on the run. Bridge along the elevated track running along the suspension can also be elevated following in orbit, this is called the crane girder suspension cranes.

Specialized metallurgical  overhead bridge crane  in the steel production process can participate in a particular process operation, its basic structure and general overhead cranes are similar, but in lifting a small car is also equipped with a special working body or device. This crane is characterized by frequent use of the work, conditions, higher level work. There are five main types.

Simple beam bridge crane type foundry casting crane cranes: for lifting hot metal injection Mixer, injecting molten steel furnaces and continuous ingot lifting equipment or ingot molds and other purposes. Main car lifting ladles, ladles, Vice car to flip and other auxiliary work.

Clamp Crane: the use of high-temperature steel ingot clamp vertically lifted onto a soaking pit furnace, or put it out into the car shipped ingot.

Off ingot cranes: for the ingot from the ingot mold forced prolapse. Small car off the ingots have a special device, way off the ingot mold according to the shape of the ingot: some undesignated off lever pressed ingot ingot  sino hoist  , lift the ingot mold with tongs; some with tongs pressed ingot mold, with the tweezers lift ingots.

Feeding Crane: Used in the open-hearth furnace charge added. Lord of the column with the bottom of the car to pick rod for stirring bins and place it into the furnace. The main column is rotatable about a vertical axis of rotation, pick rod can swing up and down and swing. Vice trolley for furnace repair and other auxiliary operations.

Forging Cranes: Used with hydraulic forging machine with large workpieces. Main car hanging on a hook turn special feeder to support and flip the workpiece; Vice trolley for lifting workpieces.

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