The invention relates to the technical field of
electron microscopes, aims at solving the problems that in an existing sample transfer support, the low-temperature
holding time of a sample rod is short,
liquid nitrogen in a Dewar tank is boiled, so that the sample rod vibrates,
electron microscope imaging drifts are caused, and the inclination angle of the sample rod is limited, and provides an ultra-long endurance sample
transmission system for a cryoelectron
microscope, which comprises the Dewar tank and the sample rod, the Dewar tank comprises an outer tank and an inner tank, the inner tank is located in the outer tank, first low-temperature fluid is stored in the outer tank, second low-temperature fluid is stored in the inner tank, and the
boiling point of the second low-temperature fluid is higher than that of the first low-temperature fluid; a cold guide plate is arranged in the inner tank, the sample rod comprises an outer rod and a cold guide rod, the cold guide rod is located in the outer rod, one end of the cold guide rod extends into the inner tank and is connected with the cold guide plate, and the other end of the cold guide rod extends out of the outer rod and is connected with the sample rack; the outer rod is connected with a first connecting
assembly, the Dewar tank is connected with a second connecting
assembly, and the first connecting
assembly is detachably connected with the second connecting assembly. The low-temperature
holding time is long, drifting is small, and the inclination angle of the sample rod is large.