Stoker grates for circulating combustible material

A stoker grate for circulating a combustible material, the stoker grate having an annular shape, comprising:

• a stationary grate sheet support having a long annular shape,
• a moveable grate sheet support fitting with prop rolls on the stationary grate sheet support, the moveable grate sheet support comprising a pair of rectangular moveable grate sheet supports opposed to each other and another pair of arc-shaped moveable grate sheet supports opposed to each other to form a long annular-shaped assembled support, stationary grate sheets fitting with mounting transverse beams of the stationary grate sheet support, moveable grate sheets fitting with mounting transverse beams of the moveable grate sheet support, the moveable grate sheets and the stationary grate sheets being disposed alternatingly, and a transmission unit comprising at least one bearing unit which is fixed to the stationary grate sheet support, an oscillating rod is connected between the bearing of the bearing unit and the rectangular or arc-shaped moveable grate sheet support, the rectangular or arc-shaped moveable grate sheet support connected with the oscillating rod is a driving moveable grate sheet support, the rectangular or arc-shaped moveable grate sheet support not connected with the oscillating rod is a driven moveable grate sheet support, the driving moveable grate sheet support is hinged to the adjacent driven moveable grate sheet support and the driven moveable grate sheet supports are hinged to each other, and the oscillating rod is connected with a power input link, the stoker grate being structured so that oscillation of the oscillating rod and resulting oscillation of the moveable grate sheets causes the combustible material to move by circulating around the annular-shaped stoker grate.