Inner cavity polishing device for fire valve machining

The utility model discloses an inner cavity polishing device for fire valve processing, which comprises a base, a controller is arranged on the front side of the base, a clamping mechanism is arranged on the base, and a placing table is arranged on the inner side of the clamping mechanism on the base. The inner diameter of the valve is set through the controller, the controller controls the electric push rod to stretch out by a proper distance, meanwhile, the grinding mechanism, the piston rod, the first connecting rod, the second connecting rod and the third connecting rod are controlled and adjusted to be used in cooperation, and the distance between the two grinding blocks is adjusted; when a distance measuring sensor detects that the distance between the two grinding blocks is matched with a set value, adjustment is stopped, accurate automatic adjustment and calibration are achieved, time is saved, the price efficiency is improved, meanwhile, two second electric push rods and a rotating mechanism are arra