The tensioning device is to ensure that the chain is in the original tensioned state, compensate for the tensile deformation of the chain under the action of tension and the expansion and contraction deformation caused by temperature differences, and ensure that there is a moderate tension between the driving device and the tensioning device. Generally, it is placed behind the transmission device at the place with the smallest tension. After tensioning, there should be no large load drop slope section. The structure is relatively compact and easy to install. However, since its tension is limited by the spring coefficient, it is generally suitable for occasions with shorter lines and little temperature change.
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