Spiral conveyor

A spiral conveyor comprising rotary drums, wherein a mesh chain is spirally wound around an outer circumference of each of the rotary drums and rotates synchronously with each of the rotary drums;

• an inner side of each chain link of the mesh chain close to the rotary drum is provided with a plurality of drive heads extending toward a drum body of the rotary drum;
• each of the plurality of drive heads is provided with a convex-arc edge and comprises an arc slot provided on each of two sides or on a single side of the drive head and coinciding with a driving pole of a plurality of driving poles;
• the plurality of driving poles are evenly distributed around the outer circumference of the rotary drum and engage with the plurality of drive heads of each layer;
• a bottom of the mesh chain of each layer is supported on a spiral ring rail to allow sliding;
• the spiral ring rail of each layer is fixed to radial support rods;
• the radial support rods each comprises an outer end fixed to a vertical post of a plurality of vertical posts;
• and the plurality of vertical posts are evenly distributed around an axis of the rotary drum,
• wherein an arc-shaped limiting plate is provided below a turning transition section, and the mesh chain turns and moves forward along a limiting arc of the arc-shaped limiting plate;
• a radius of the limiting arc is equal to or less than a distance between a head end of the limiting arc and the axis of the rotary drum;
• and an axis of the limiting arc deviates from the axis of the rotary drum, such that a distance between a tail end of the limiting arc and the axis of the rotary drum is less than the distance between the head end of the limiting arc and the axis of the rotary drum.