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The Development of Folding Lorry-Mounted Crane Boom

LI Guo-hua(Shaoguan City Crane Limited Company,Shaoguan512025)  
Most boom styles of folding lorry-mounted crane are hexagon.The early general structures of the boom are four-welding seams structure or two-welding seams structure in Chain.These two structures must be connected by four welding seams and two welding seams respectively.In recent years,with the development of lorry-mounted crane there is a new hexagon boom structure which just has one welding seam.The characteristic of different structure style have been introduction following.
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