A load-adaptive hoisting mechanism

A load-adaptive hoisting mechanism, used for transmitting torque power, comprising:

• a bracket and roofs, wherein the roofs are arranged above the bracket, upright columns are arranged between the bracket and the roofs, through holes corresponding to the upright columns are formed in the roofs, the upright columns are arranged in the through holes, and the lower ends of the upright columns are connected with the bracket;
• first springs sleeving the upright columns between the bracket and the roofs;
• two roof pulleys arranged on the roofs;
• a roller is arranged in the center above the bracket, being a truncated conical type, and fixedly mounted on the power input shaft in a sleeving manner, wherein the power input shaft is arranged on the bracket via a bearing;
• transmission wheels arranged at the lower part of one side on the bracket corresponding to the roof pulleys;
• tensioning cables arranged between the transmission wheels and the roller, wherein the tensioning cables in the form of a closed ring wind around the two roof pulleys;
• a cable tensioning mechanism arranged on the tensioning cables between the cable sending side of the roller and the cable winding sides of the transmission wheels when the mechanism works.