X-ray photon counting type detector protection system

The utility model discloses a protection system of an X-ray photon counting type detector. The protection system comprises an X-ray shielding door, a straight-through diaphragm adjusting mechanism and an inert gas cavity. The X-ray shielding door adopts a left-right rotation integrated ball screw to realize opening and closing of the pair of X-ray shielding doors. When the shielding door is in an open state, the detection area of the X-ray detector is completely exposed under the irradiation of X-rays; and when the shielding doors are in the closed state, the shielding doors are completely closed, and the pair of shielding doors has an overlapped area. The straight-through diaphragm adjusting mechanism comprises a two-dimensional precise electric control translation table, a table top adapter plate, a stainless steel slender rod and a stainless steel blocking cylinder. The inert gas cavity comprises a stainless steel front baffle, an aluminum alloy rear baffle and an organic glass sealing assembly. According