Tray

A tray for bearing storage units in different size, comprising:

• a main body including a bottom plate and at least one protrusion, wherein the bottom plate has a bearing surface for bearing the storage units;
• an arc-shaped through hole formed at the bottom plate, wherein the arc-shaped through hole has a first end and a second end opposite to each other, the arc-shaped through hole is formed at the bottom plate along a circumference of a virtual circle, the at least one protrusion is at the arc-shaped through hole;
• a connecting rod, wherein one end of the connecting rod is pivotally connected with the bottom plate, and the other end of the connecting rod moves between the first end and the second end along the arc-shaped through hole, a pivot center of the connecting rod is at the bottom plate, and a center of the virtual circle is at the pivot center;
• wherein the connecting rod comprises a limiting element interfering with the protrusion;
• and
• a supporting portion disposed on a side of the bottom plate opposite to the bearing surface and adjacent to the arc-shaped through hole, the supporting portion used for supporting the connecting rod at a specific location.