Combined chain wheel with function of adjusting tension of chain

The invention discloses a combined chain wheel with a function of adjusting the tension of a chain and belongs to the field of chain transmission equipment. The combined chain wheel is used for a chain-transmission lifting mechanism of a three-dimensional parking garage and structurally comprises a hub connected with an output shaft of a driving mechanism and a ring-shaped chain wheel which sleeves the hub and has rotational freedom degree. The combined chain wheel is characterized in that the structure also comprises an adjusting and limiting mechanism arranged between the hub and the ring-shaped chain wheel; the adjusting and limiting mechanism and the ring-shaped chain wheel are rotatably matched to form tension adjusting structures of the chain. The combined chain wheel disclosed by the invention has the advantages that the ring-shaped chain wheel is embedded into the hub, and the ring-shaped chain wheel can rotate by a certain angle by means of the adjusting and limiting mechanism to adjust the magnitude of the tension of the chain at the two sides of the ring-shaped chain wheel, so that the tension of the chain is consistent and the stressing of the chain is uniform.