Sand ware is dragged for along with boring to circulation of turning over

The utility model discloses a sand ware is dragged for along with boring to circulation of turning over, including top connection, cartridge, lower clutch and center tube, the center tube setting justsets up with the cartridge is concentric in the cartridge, the one end of center tube and the inner wall threaded connection of lower clutch, the other end is the free end, the both ends of cartridgerespectively with the outer wall threaded connection of lower clutch and top connection, the department is formed with an annular boss at cartridge next -door neighbour lower clutch terminal surface,the inner wall that center tube one side is close to in the top connection forms trumpet - shaped, and the diameter that this trumpet - shaped connects annular boss department is the same with the diameter of annular boss, and to the orientation convergent of keeping away from annular boss, form the clearance of being convenient for drag for the work of sand ware between the free end of center tube and the annular boss. Sh