Shaft connecting structure and juicer

A shaft connecting structure for a juicer, comprising:

• a first connecting shaft provided with a receptacle and a plurality of first correcting grooves, wherein a cross section of the receptacle is a regular polygon structure in a direction perpendicular to an axial direction of the first connecting shaft, the receptacle is provided with inner angles, the plurality of first correcting grooves are arranged at intervals in a circumferential direction of the first connecting shaft, each of the first correcting grooves extends to an adjacent side wall of the receptacle, a distance between each of the first correcting grooves and an axis of the first connecting shaft gradually decreases in a concave direction of the receptacle, and a width of each of the first correcting grooves gradually decreases in a direction from the receptacle to the respective first correcting groove;
• and
• a second connecting shaft provided with a protrusion, wherein a cross section of the protrusion is matched with the cross section of the receptacle in a direction perpendicular to an axial direction of the second connecting shaft, the second connecting shaft is provided with a plurality of second correcting grooves, the plurality of second correcting grooves are arranged at intervals in a circumferential direction of the second connecting shaft, each of the second correcting grooves extends to a respective side surface of the second connecting shaft, a sharp part is formed between the adjacent second correcting grooves, and one end of the second connecting shaft is accommodated in the receptacle and is capable of moving in the circumferential direction of the first connecting shaft;
• wherein, when each of the inner angles is misaligned with the respective sharp part, the sharp part slides into the receptacle from the respective first correcting groove, and the sharp part is in sliding contact with a side wall of the respective first correcting groove, so that the protrusion is inserted into the receptacle.