The structure and principle of manual hoist

Manual lashing cargo with a chain wheel, hand zipper, transmission machinery, hoisting chain and the upper and lower hook and other parts. The mechanical transmission part can be divided into the worm and gear transmission two. Due to the mechanical efficiency of worm gear type transmission is low, parts easy to wear, so rarely used now. single girder gear transmission has several models, in which HS is a manual chain block popular; type WA is improved on the basis of type HS; SBL is the use of new structure of transmission, high mechanical efficiency of it, but the weight ratio of HS type heavy some.

manual chain block structure principle of the heavy device: the one with the reverse check braking deceleration combiner and chain pulley.