Hoisting mechanism capable of self-calibrating positioning deviation

The utility model discloses a hoisting mechanism capable of self-calibrating positioning deviation. The outer end surface of a bottom platform of the cart is provided with a groove; a zero calibrationproximity switch is arranged; a zero calibration proximity switch detection plate used in cooperation with the zero calibration proximity switch is further arranged at the position, close to the endof the track, of the outer side of the track where a cart bottom platform provided with the zero calibration proximity switch is located, and signals of the zero calibration proximity switch are transmitted to a PLC control box through a twisted-pair shielded wire. The crane disclosed by the utility model can move to the position near the zero point calibration proximity switch detection plate when the crane cart moves forwards; the zero calibration proximity switch sends a signal to the PLC control box through the twisted-pair shielded wire; the PLC control box controls the cart encoder to reset the position data, so