Constant weight instrument and sample conveying device thereof

The utility model discloses a constant weight instrument and a sample conveying device thereof, the sample conveying device comprises an annular conveying line, and the longitudinal width of the annular conveying line is adjustable; the driving mechanism is in transmission connection with the annular conveying line and used for enabling the annular conveying line to circularly move in the track direction of the annular conveying line; the supporting piece comprises a supporting end and a connecting end which are oppositely arranged, the supporting end is provided with a supporting opening usedfor supporting a container containing a sample to be detected, and the connecting end is used for being connected with the annular conveying line. The sample conveying device is high in space utilization rate and small in occupied space; in this way, the constant weight instrument adopting the sample conveying device is small in size, and space is saved. 本实用新型公开了一种恒重仪及其样品输送装置，样品输送装置包括：环形输送线，且所述环形输送线的纵向宽度可调；驱动机构，所述驱动机构与所述