Locking mechanism for double-sided polishing machine

The utility model discloses a locking mechanism for a double-sided polishing machine, which comprises a lifting component, a locking component and a locking component, the lifting component comprises a lifting cylinder, an I-shaped connector mounted at the driving end of the lifting cylinder and a connecting seat mounted at the bottom of the connector; the connecting assembly is mounted at the bottom of the lifting air cylinder; the locking assembly comprises a fixed seat arranged on the connecting assembly, a magnetic switch arranged on the fixed seat, and a safety bolt which is arranged at the driving end of the magnetic switch and is in butt joint with the connector; when the air cylinder lifts the upper disc to the top point (inducted by the magnetic switch), the locking air cylinder pushes the safety locking bolt into the groove of the lifting air cylinder connecting shaft, even if the air cylinder falls off, the upper disc does not fall off due to the effect of the I-shaped structure of the safety bolt,