Circular-cylinder sieve

A cylindrical sieve, which includes:

• a cylindrical first net member that has ring projections provided on both ends thereof;
• a cylindrical second net member that has ring projections provided on both ends thereof;
• multiple bar members of a preset length that are extended in an axial direction;
• a first ring member that is fixed to or fit in respective one ends of said bar members;
• a second ring member that is fixed to or fit in respective other ends of said bar members;
• an intermediate ring member that is fixed to middle sections of said bar members;
• a pair of first holder ring members that are located between said first ring member and said intermediate ring member to be movable along said multiple bar members and have ring recesses;
• and
• a pair of second holder ring members that are located between said intermediate ring member and said second ring member to be movable along said multiple bar members and have ring recesses,
• wherein said ring projections of said first net member are set in said ring recesses of said first holder ring members, said first holder ring members are respectively brought into contact with said first ring member and with said intermediate ring member, and said first holder ring members are respectively fastened to said first ring member and to said intermediate ring member by means of fixation elements, and
• said ring projections of said second net member are set in said ring recesses of said second holder ring members, said second holder ring members are respectively brought into contact with said intermediate ring member and with said second ring member, and said second holder ring members are respectively fastened to said intermediate ring member and to said second ring member by means of fixation elements.