Patent ID: 11913887
Assignee: ZHEJIANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The grain sampling and imaging device according to claim 1, wherein the multi-stage restricting port (5.5) comprises a grain input port (5.5.2), a first-stage restricting port (5.5.1), a second-stage restricting port (5.5.3) and a third-stage restricting port (5.5.4) the latter three of which are provided within the grain input port (5.5.2) from top to bottom in sequence;
the grain input port (5.5.2), has a through-hole structure and is provided at a top surface of the sampling body (5);
the first-stage restricting port (5.5.1), the second-stage restricting port (5.5.3) and the third-stage restricting port (5.5.4) each have a trumpet-shaped structure, wherein an outer wall of an upper end of the trumpet-shaped structure of the first-stage restricting port (5.5.1) is fixed to an inner wall of the grain input port (5.5.2), an inner diameter of a lower end of the trumpet-shaped structure of the first-stage restricting port (5.5.1), that of the second-stage restricting port (5.5.3) and that of the third-stage restricting port (5.5.4) gradually decrease; and
an inner diameter of the upper end of the trumpet-shaped structures is larger than the inner diameter of the lower end of the trumpet-shaped structures.