Grinder assembly

A grinder, comprising:

• a rod head having a section of shell section and the press portion, said shell portion having a opening and a shell hole which extending to a screw hole provided inside the press portion;
• a main body having a tube hole with the diameter larger than the outer diameter of said shell section, inside the tube hole providing a separating piece which having a separating hole, the inner wall of bottom section further providing tube thread;
• a tail portion having the tail thread on the outer wall of bottom section which corresponding to said tube thread, upper portion inside having a reservoir and extending to a output hole;
• a spring having the outer diameter smaller than tube hole;
• a grinding rod having a grinding thread which corresponding to said screw hole provided on the top section, bottom section having grinding teeth and middle portion providing a baffle piece which having larger outer diameter than separating hole;
• by screws said grinding rod with rod head and screws said tail portion with bottom section of main body, the movement of grinding rod reciprocally with tube thread to grind the material to be grinded.