The invention relates to the technical field of industrial robots, in particular to a stacking
robot wrist supporting structure and a rigidity calibration method. The structure comprises a
forearm and a
wrist, and the connecting end of the
forearm and the connecting end of the
wrist are each of a U-shaped structure. The small arm comprises a left small arm hinge lug and a right small arm hinge lug; the wrist comprises a
left wrist hinge lug and a
right wrist hinge lug; the left
forearm hinge lug and the right forearm hinge lug are located on the inner side of the
left wrist hinge lug and the inner side of the
right wrist hinge lug respectively, the left forearm hinge lug and the
left wrist hinge lug are hinged through a left short shaft
assembly, and the right forearm hinge lug and the
right wrist hinge lug are hinged through a right short shaft
assembly. The supporting rigidity of the wrist is improved, the supporting rigidity can be adjusted while the axial relative position of the wrist and the forearm meets the bearing pre-pressing requirement, and the
axial rigidity of the two hinge lugs of the wrist and the two hinge lugs of the forearm is improved.