Chain tensioning mechanism used for chain-type lifting device

The invention relates to a chain tensioning mechanism used in a chain type hoisting device. The invention is arranged between a carrying mechanism and a chain, the chain is meshed on an upper chain wheel and a lower chain wheel, the invention is characterized in that the chain tensioning mechanism comprises a main body which can be fixedly connected on the carrying mechanism; one end of a pulling spring is connected on the main body, and the other end is connected on a tensioning sliding block; the tensioning sliding block is connected with the main body by the sliding way, and can slide up and down oppositely to the main body; one end of the chain is connected on the carrying mechanism or the main body, and the other end is connected on the tensioning sliding block. Compared with the prior technology, the chain tensioning mechanism used in the chain type hoisting device has the following advantages that: 1. the chain length can be automatically and timely adjusted according to the different working states, t