Modular and expandable storage rack for quick assembly and disassembly

A modular and expandable storage rack for quick assembly and disassembly, comprising a plurality of first connecting pieces, a plurality of second connecting pieces, a plurality of third connecting pieces, a plurality of fourth connecting pieces, a plurality of support rods, and a plurality of storage partitions, wherein the plurality of first connecting pieces are distributed in a rectangular array, the plurality of second connecting pieces are distributed in a rectangular array, the plurality of third connecting pieces are distributed in a rectangular array, the plurality of fourth connecting pieces are distributed in a rectangular array, the plurality of support rods are distributed in a rectangular array;

• and
• each of the plurality of storage partitions comprises four connecting rods, and two adjacent storage partitions located in a same plane share a same connecting rod;
• each of the plurality of first connecting pieces comprises a first longitudinally-extending hollow tube and two first side hollow tubes radially-extending from a middle portion of the first longitudinally-extending hollow tube;
• wherein the first longitudinally-extending hollow tube has opposing ends for receiving two corresponding adjacent support rods or two corresponding adjacent connecting rods;
• the two first side hollow tubes are perpendicular to each other;
• each of the two first side hollow tubes has an open end for receiving one corresponding support rod or one corresponding connecting rod;
• one opposing end of the first longitudinally-extending hollow tube is fixedly provided with a first bump, and the first bump is attached to an outer side of one corresponding support rod;
• each of the plurality of second connecting pieces comprises a second longitudinally-extending hollow tube and two second side hollow tubes radially-extending from an end portion of the second longitudinally-extending hollow tube;
• the second longitudinally-extending hollow tube has an open end for receiving one corresponding support rod;
• the two second side hollow tubes are perpendicularly to each other;
• and each of the two first side hollow tubes has an open end for receiving one corresponding connecting rod;
• each of the plurality of third connecting pieces comprises a third longitudinally-extending hollow tube and three third side hollow tubes radially-extending from a middle portion of the third longitudinally-extending hollow tube;
• the third longitudinally-extending hollow tube has opposing ends for receiving two corresponding adjacent support rods or receiving one corresponding support rod and one corresponding connecting rod;
• two of the three third side hollow tubes are coaxial and perpendicular to a third of the three third side hollow tubes;
• and each of the three third side hollow tubes has an open end for receiving one corresponding support rod or one corresponding connecting rod;
• and
• each of the plurality of fourth connecting pieces comprises a fourth longitudinally-extending hollow tube and four fourth side hollow tubes radially-extending from a middle portion of the fourth longitudinally-extending hollow tube;
• the fourth longitudinally-extending hollow tube has opposing ends for receiving two corresponding adjacent support rods;
• the four fourth side hollow tubes are coplanar and perpendicular to each other;
• and each of the four fourth side hollow tubes has an open end for receiving one corresponding connecting rod.