Mounting structure of storage basket and multi-layer storage rack with the same

A multi-layer storage rack comprising:

• a mounting structure of a storage basket;
• and
• a post assembly;
• said mounting structure of said storage basket comprising a post and a plug-in assembly connecting said post to said storage basket;
• said plug-in assembly includes a plug-in tube and a fitting tube sleeved outside said post, said plug-in tube is detachably sleeved outside said fitting tube to squeeze said fitting tube to tightly embrace said post and to be fixed;
• said plug-in tube is provided with a first plug-in portion, said storage basket is provided with a second plug-in portion, said first plug-in portion and said second plug-in portion cooperate to insert, thereby installing said storage basket on said plug-in tube;
• wherein an outer wall in a middle of said fitting tube is provided with external threads, a top of said fitting tube is provided with several notches;
• said notches divide said top of the fitting tube into several independent plug-in pieces;
• each of said plug-in pieces is provided with a bump, a thickness of said bump gradually increases downwards;
• an inner wall of said plug-in tube is provided with internal threads, said plug-in tube is sleeved outside said fitting tube from said top thereof so that said top of said fitting tube is accommodated in said plug-in tube, said internal threads cooperates with said external threads, thereby realizing a detachable installation of said plug-in tube and said fitting tube;
• said inner wall of the plug-in tube squeezes said bumps on said plug-in pieces so that said plug-in pieces tightly embrace said post, thereby fixing said plug-in assembly on said post;
• said post assembly comprising a plurality of said posts, an upper tube end, and a lower tube end;
• each of said posts has a main body, and a large end and a small end relatively arranged at both ends of said main body;
• a diameter of said large end is equal to that of said main body, said large end is provided with a first thread, a diameter of said small end is less than that of said main body, said small end is provided with a second thread, when two of said posts are connected, said small end of one is inserted into said large end of the other, and said two of said posts are threaded together.