Shell for ultralow-temperature screw unit

The utility model discloses a shell for an ultralow-temperature screw unit. Housing comprising a body, pull ring cavities are formed in the upper side and the lower side of the left end wall of the box door; a pull ring is movably mounted in an inner cavity of the pull ring cavity through a rotating shaft; clamping plates are fixedly mounted at the upper end and the lower end of the box door; a cross rod is fixedly mounted on the right end wall of the clamping plate; a limiting block is fixedly installed at the right end of the transverse rod, a clamping plate is fixedly installed at the leftend of an inner cavity of the body shell, a flexible pad is fixedly installed on the left end face of the clamping plate, clamping plate cavities are fixedly installed on the upper side and the lowerside of the left end of the body shell, inserting grooves are formed in the right end walls of inner cavities of the clamping plate cavities, and limiting grooves are fixedly formed in the rear ends of the inserting grooves. B