Rotating folding structure for folding chair frame and folding chair frame and folding chair thereof

A rotating folding structure for a folding chair frame, comprising a first rotating support base, a second rotating support base, a third rotating support base and a fourth rotating support base;

• the first rotating support base comprises a first base block, a horizontal first upper plate and a horizontal first lower plate are arranged on the first base block;
• the second rotating support base comprises a second base block, a horizontal second upper plate and a horizontal second lower plate are arranged on the second base block;
• the first upper plate and the first lower plate interlace and insert into the second upper plate and the second lower plate, with the first upper plate located above the second upper plate;
• the third rotating support base comprises a third base block, a horizontal third upper plate and a horizontal third lower plate are arranged on the third base block;
• the fourth rotating support base comprises a fourth base block, a horizontal fourth upper plate and a horizontal fourth lower plate are arranged on the fourth base block;
• the third upper plate and the third lower plate interlace and insert into the fourth upper plate and the fourth lower plate, with the fourth upper plate located above the third upper plate;
• the third upper plate, the third lower plate, the fourth upper plate, and the fourth lower plate are partially or fully inserted between the second upper plate and the first lower plate;
• the first rotating support base, the second rotating support base, the third rotating support base, and the fourth rotating support base are movably sleeved on a rotating shaft;
• the first rotating support base, the second rotating support base, the third rotating support base, and the fourth rotating support base are configured to be unfolded and folded by rotation.