Tail end swinging joint driving mechanism

The invention discloses a tail end swinging joint driving mechanism, which comprises a lower bottom plate, wherein a transverse dovetail guide groove and a longitudinal dovetail guide groove are respectively formed in the lower bottom plate; a transverse guide rail is glidingly connected in the transverse dovetail guide groove; a longitudinal guide rail is glidingly connected in the longitudinal dovetail guide groove; a first pin shaft is connected onto the transverse guide rail; a second pin shaft is connected onto the longitudinal guide rail; the first pin shaft and the second pin shaft are respectively inserted into pin holes of a tool connecting rod for forming two rotating pairs; an upper bottom plate is fixed on the lower bottom plate; a tool connecting rod moving stroke groove is formed in the bottom surface of the upper bottom plate; the back end of the tool connecting rod is arranged in the stroke groove; a steel wire rope moving stroke groove is formed in the front end of the bottom surface of the upper bottom plate; one ends of the two steel wire ropes are respectively guided by one wire guide wheel and then pass through the steel wire rope moving stroke grooves formed in the corresponding side to be fixed in the wire fixing holes of the upper bottom plate; the two wire guide wheels are respectively fixed in the tool connecting rod through wire guide wheel pin shafts. The equal extension and contraction of the tail end swinging joint can be realized.