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Make the whole conveyor chain keep a relatively stable tension during operation, and colleagues can absorb or compensate the expansion and contraction of the conveyor chain due to thermal expansion, cold shrinkage and stress deformation. There are two kinds of tension devices: spring tension and heavy hammer tension. The spring tension structure is compact, but its elastic force changes due to the size of deformation force, so it is generally suitable for the situation with short circuit and little temperature change. The tension force of the heavy hammer is relatively stable, with a wide range of application