Pin shaft mounting structure of stacking machine

The utility model belongs to the technical field of mechanical connection of stacking machines, and discloses a stacking machine pin shaft mounting structure which comprises a positioning pin assembly and an anti-falling fixing assembly. The positioning pin assembly comprises a shaft sleeve assembly, a pin shaft and a positioning block; the shaft sleeve assembly is installed on a frame shaft hole. The pin shaft penetrates through the shaft sleeve assembly and is matched with the diameter of an inner hole of the shaft sleeve assembly; the anti-disengaging fixing assembly is installed at the end of the pin shaft and used for fixing the pin shaft. The positioning block is installed on the shaft sleeve assembly, connected with a pin cap of the pin shaft in a clamping mode and used for preventing the pin shaft from rotating. According to the utility model, the safety of the connecting part of the door frame of the stacking machine and the frame pin shaft can be ensured, the defect that the pin shaft and the frame