Automatic expansion and contraction material receiving disc

The utility model discloses an automatic expansion and contraction material receiving disc which comprises a paper tube, a main fixing disc, an expansion and contraction piece, a rolling shaft and a rolling supporting assembly, the paper tube, the main fixing disc and the rolling shaft are coaxially arranged, the main fixing disc is fixedly arranged on the rolling shaft in a sleeved mode, the paper tube is arranged on the outer side of the main fixing disc, and a gap is reserved between the outer ring of the main fixing disc and the inner ring of the paper tube. A metal strip coil winds the outer ring of the paper tube; a groove is formed in the peripheral face of the main fixing disc, the expanding and shrinking piece is correspondingly embedded in the groove, the face, opposite to the groove, of the inner side of the expanding and shrinking piece is a guide rail face, the guide rail faces are inclined faces, and a rolling supporting assembly is arranged between the two guide rail faces. The expanding and sh