Tube-array type nitrogen canister

A method of removing a tube from a tube-array-type liquid nitrogen container, wherein the tube-array-type liquid nitrogen container comprises a container body with a mouth;

• a tube array component received in the container body;
• and a top cap sealing the mouth from above;
• wherein the top cap is rotatably arranged in the mouth, wherein the tube array component includes a plurality of holding tubes, each configured to hold a freezing tube, the holding tubes are such opened at one end thereof that openings of the holding tubes face the top cap, the top cap has at least one tube access passing through the top cap, and the at least one tube access is covered by a tube access cover on top end, and wherein the container body comprises an inner column and an outer column sleeving the inner column at an outside, wherein the inner column and the outer column are fixed to each other at a bottom, the inner column has a top lower than a top of the outer column, and the top of the inner column and the top of the outer column are connected through a corrugated pipe, the method comprises the steps of:
• rotating the top cap of the tube-array-type liquid nitrogen container such that the tube access of the top cap is moved to a targeted site;
• lifting the tube access cover to open the tube access;
• and
• removing a targeted freezing tube from the tube-array-type liquid nitrogen container.