Equipment for coating graphite on inner wall of nuclear fuel subassembly

The invention provides nuclear fuel subassembly inner wall graphite coating equipment which comprises an automatic feeding and discharging mechanism, a conveying and positioning mechanism and a spraying mechanism, and the automatic feeding and discharging mechanism moves a subassembly to a rotary disc of the conveying and positioning mechanism; the spraying mechanism comprises two spraying supports, each spraying support is provided with a spraying air cylinder and an auxiliary positioning air cylinder, each spraying air cylinder is provided with a spraying head, and a sensor is arranged on the lower portion of each auxiliary positioning air cylinder so that the spraying air cylinders can drive the spraying heads to descend after sensing the secondary assemblies. Two sets of spraying mechanisms are installed, one device can alternately produce secondary assemblies with the diameters of 37R and 37M, in addition, accurate positioning in the spraying process is achieved through an auxiliary positioning air cylin