▎ 摘　　要

NOVELTY - The utility model claims a kind of used for expansion of the graphene layer a plurality of hole-shaped filter core is a cavity, a cavity cover (1), (2) and cavity (3), the cavity (3) of the front end of a cavity port (2), a cavity port (2) with cavity cover (1), the cavity (3) is a multi-layer hole-shaped structure. Hole-shaped structure to the micro nano graphene powder limit in the cavity, so as to lead in and generated by the gas can overflow to prevent the graphite alkene powder to pollute the pipeline and environment with gas flow. The inner cavity to expand and the sample collecting, safe to use, high temperature and high pressure resistant, anti-corrosion, but also can improve the producing efficiency and expansion graphite.