The utility model discloses a liquid-
helium-free extremely-low-temperature refrigerating
machine device which comprises a refrigerating
machine, the output end and the input end of the refrigerating
machine are both connected with connecting devices, and each connecting device comprises a conveying
pipe, a small gear, a large gear, an unlocking sleeve, an unlocking block, a tension spring, a clamping frame, a
gasket, a connecting
pipe, a clamping groove, a limiting plate, a
threaded rod and a motor. The connecting pipes are arranged at the input end and the output end of the refrigerating machine respectively, the conveying pipes are installed in the connecting pipes, the unlocking sleeves are arranged on the outer sides of the connecting pipes in a sleeving mode, the screws and the unlocking sleeves are movably connected through threads, the limiting plates are arranged on the outer sides of the connecting pipes, the small gears are installed at one ends of the screws, the large gears are arranged on the outer sides of the connecting pipes in a sleeving mode, and the motor is connected with one screw. The clamping groove is formed in the outer side of the conveying
pipe, the clamping frame is clamped with the clamping groove, the unlocking blocks are arranged on the two sides of the clamping frame, the tension spring is arranged on the inner side of the clamping frame, the
gasket is arranged on the inner side of the connecting pipe, and a clamping device is arranged on the refrigerating machine. The use convenience and
maintainability of the refrigerating machine are fully guaranteed.