Span adjustable lifting tool

A span adjustable lifting tool comprises a main beam force bearing mechanism, a steel rope conveying and lifting mechanism and a lifting lug bolt bearing mechanism; a lifting ring (1) and a main beam (3) in the main beam force bearing mechanism are connected through a force bearing pin I and are locked axially through a shaft elastic damping ring I (10); bilateral sides of the main beam (3) are provided with circular grooves which are regularly formed; upper force bearing pins II (4) in the conveying and lifting mechanism can be hung inside any circular groove of the main beam (3); upper lifting lugs and lower lifting lugs (5) are connected through steel ropes (6); the lower lifting lugs (5) and lifting lug bolts (7) which are connected through the force bearing pin II (4) are locked axially through shaft elastic damping rings II (11); parts are installed on the lifting tool due to the fact that the lifting lug bolts (7) and nuts (12) are connected through threads; the span adjusting lifting function is achie