HC-Lecture62-Cranes-Hoists

HC-Lecture62-Cranes-Hoists - Heavy Construction Heavy...

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Heavy Construction Heavy Construction Lecture #62 Lecture #62 Cranes and Hoists L Prieto-Portar 2008
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Hoisting devices are defined as machines that lift the load freely suspended from a hook or a shackle. The types studied here are: - Mobile mechanical cranes - Mobile hydraulic cranes - Tower cranes - Gantry cranes - Derricks - Helicopters May other devices could be included, such as, fork lifts, excavator equipment, elevators (lifts), jacks and rams, etc.
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Mobile mechanical cranes. This type of crane (usually used for the heaviest loads) has a mechanical rigid drive from its power plant (usually a diesel engine) through transmissions, chains, gears, shafts, friction clutches and cables. The basic crane motions are: (1) raising and lowering the load, (2) swinging the load by rotating the crane body on its carrier mount, and (3) raising and lowering the crane boom. The following slides show a few examples of mobile mechanical cranes.
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The 80-ton lifting capacity Kobelco CK800-III Crawler Crane features a high-tensile strength steel car body with extendible axles. The crawler assemblies can be hydraulically extended for a wide operating stance of 16'3" or retracted for an easier transport width of 11'6". It has also been designed with an innovative full hydraulic system. It performs all crane operations including load hoist, boom hoist, swing, propel and crawler extension/extraction, as well as counterweight installation and removal. Kobelco was originally a branch of Kobe Steel in Japan.
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The 100-ton lifting capacity Kobelco CK1000-III Cr CK1000-III features a full hydraulic system that performs all crane operations including load hoist, boom hoist, swing, propel and crawler extension/extraction, free-fall, as well as counterweight and crawler frame installation and removal.
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The 160-ton capacity Kobelco CK1600-II Crawler Crane performs hydraulically all operations including load hoist, boom hoist, swing, propel and crawler extension/extraction, free-fall (optional), as well as counterweight and crawler frame installation and removal.
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The 250-ton lifting capacity Kobelco CK2500-II Crawler Crane is designed from the ground up for reliable
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HC-Lecture62-Cranes-Hoists - Heavy Construction Heavy...

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