Adjusting structure

An adjusting structure comprises an outer spiral assembly and an inner spiral assembly, the outer spiral assembly comprises an outer spiral piece, an inner threaded piece and a first elastic piece, the inner threaded piece is arranged in the outer spiral piece in a sleeved mode, and a threaded connecting hole is formed in the inner threaded piece; the first elastic piece elastically abuts against the position between the outer spiral piece and the inner threaded piece so that the inner threaded piece can synchronously rotate along with the outer spiral piece. The inner spiral assembly is in threaded connection in the threaded connection hole; when the outer spiral piece is rotated, the inner threaded piece can rotate along with the outer spiral piece to drive the inner spiral assembly to move in the first direction. When the inner spiral assembly moves to the stop position, the first elastic piece can enable the outer spiral piece and the inner threaded piece which continue to rotate to rotate relative to eac