The concept and the development history of the derrick
Perpendicular in the certain scope promote with the level porterage heavy thing much action derrick 械 .Call hoist again.Belong to the material porterage machine.The work of the derrick the characteristics is to do by fits and starts sport, taking to anticipate in a work the circulation,the luck move,unload etc. action of correspond organization is alternation work of.
China ancient times irrigation 桔 used in farmland?BE the arm type the embryo of the derrick.14 century, the Western Europe appear the manpower and the 畜 dint to drive of turn and move the arm type derrick.Period 19 centuries ago, appear a bridge type derrick;Derrick of the importance wear away a piece,such as stalk,wheel gear, and mourn etc. a beginning adoption the metals material manufacturing, and beginning adoption the water power drive.19 period after century, the steam drive of derrick gradual replace water power drive of derrick.20 century 20's beginning, because of electricity industry and I.C. engine industry quick development, take the electric motor or the I.C. engine as motive equip of various derrick is basic formation.
The derrick is main to include to rise organization,circulate organization,become an organization and turn round the organization and metals structure etc..Rise organization is the basic work organization of the derrick, they mostly from hang to hang the system and winch to constitute, have already pressed system to ascend and descend a heavy thing through a liquid as well.Work circulated organization in order to and lengthways the level luck to move a heavy thing or adjust derrick position, general from electric motor,decelerate machine,make to move the machine and car wheel to constitute.Become an organization an equipment a type a derrick at the arm up, the arm 仰 the hour range let up, the 俯 descend the range enlarge, cent the balance change and not the balance change two.Turn round organization to make in order to the arm turn round, from drive equip and turn round to accept equip to constitute.The metals structure is the framework of the derrick, the main loading piece,such as the bridge,the arm and door, can is box the form structure or the 桁 structure, can also for the stomach plank structure, have of can use a steel as to accept beam.
The derrick can is divided into according to the dissimilarity of the structure:The ① bridge type derrick.Can at the rectangular place and its sky homework, used for car more,the warehouse,open-air heap field the product of[with] etc. pack to unload, having a beam type derrick,bridge type derrick,Dragon gate derrick,cable 索 derrick,carry bridge...etc..The ② arm type derrick.Can in the circular place and its sky homework, much used for open-air pack to unload and install etc. work, have a derrick and float to swim a derrick,mast derrick,wall a line derrick and the deck derrick etc.s.Moreover, derrick can also according to drive way,the work type,flexibility and use etc.s to carry on a classification.
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The LTM 11200-9.1 is the strongest telescopic crane on the market and has the longest telescopic boom in the world. The eight-part boom is fully automatically extended to and fixed at the desired length. In addition, various lattice extensions are available. The Y-shaped telescopic-boom guying system offers remarkable increases in load capacity. The active, speed-dependent rear-axle steering developed by Liebherr is integrated into the nine-axle chassis. Disc brakes ensure greater safety and econ.
trame sling van suspended ceiling derrick truck hoisting machine crane truck tram
The driver slewed the crane round.
Joint a boom on a crane.
The freight station is lively with cranes and vehicles of all descriptions.
A mechanism, often with buckets or scoops attached to a conveyor, used for hoisting materials.
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