Test tube rotating mechanism and production-line sample conveying system

A production-line sample conveying system, comprising a barcode scanner and a test tube rotating mechanism, wherein

• the test tube rotating mechanism is applied to a production-line sample conveying system and includes:
• a first rolling structure and a second rolling structure, wherein the first rolling structure and the second rolling structure are distributed along a conveying direction of a conveying track, each of outer side surfaces of the first rolling structure and the second rolling structure has a tangent point with a peripheral wall of any test tube holder on the conveying track to limit movement of the test tube holder, and rolling of the first rolling structure and the second rolling structure relative to the test tube holder causes the test tube holder to rotate;
• and
• a transmission structure, wherein the transmission structure is configured to drive the first rolling structure and the second rolling structure to move away from and approach the conveying track.