Frame with connecting and positioning structure

A frame for storing objects comprising:

• a plurality of hollow horizontal cross bars;
• a plurality of vertical bars, wherein each vertical bar has a plurality of vertical retaining grooves defined therein;
• a plurality of fixing seats, each fixing seat having a sleeve, a plate body and a fitting groove, each sleeve having a distal end and an opposite proximal end, wherein each plate body is affixed to each distal end of each sleeve respectively, wherein each sleeve is inserted within and fixed to a corresponding end of a corresponding cross bar from said plurality of cross bars and each plate body covers each corresponding end of each corresponding cross bar respectively;
• wherein each fitting groove defines an opening at a bottom of each fixing seat, wherein each fitting groove of each fixing seat defines a first groove portion in each plate body and a second groove portion in each sleeve of each fixing seat, wherein each first groove portion is arch shaped, and wherein each second groove portion of each fitting groove has a larger width than a width of each first groove portion of each fitting groove respectively;
• a plurality of embedded blocks, wherein each embedded block is configured to be embedded within a corresponding retaining groove from said retaining grooves of a corresponding vertical bar from said plurality of vertical bars;
• a plurality of plug-in columns, wherein each plug-in column is connected with a corresponding embedded block from said plurality of embedded blocks, wherein a shrinkage convex portion protrudes from a first end of each plug-in column and engages each corresponding embedded block from said plurality of embedded blocks respectively;
• wherein a generally rectangular shaped fitting convex portion is connected to a second end of each plug-in column, wherein an arch shaped step portion is formed between each shrinkage convex portion and each fitting convex portion respectively;
• wherein each shrinkage convex portion is configured to be embedded into each corresponding retaining groove from said retaining grooves so that each plug-in column in unable to rotate relative to the corresponding vertical bars from said vertical bars;
• wherein a fastener is inserted with a fastener hole in each fitting convex portion and penetrates each plug-in column and each embedded block respectively to secure the embedded blocks, the plug-in columns, and the fitting convex portions to the vertical bars respectively;
• wherein each fitting convex portion is configured to be inserted within each second groove portion respectively and each plug-in column is configured to be inserted within each first groove portion respectively to secure the cross bars to the vertical bars respectively.