Chain type fire grate capable of controlling air inlet amount

The chain type fire grate comprises a plurality of fire grate segments and a plurality of connecting rods, the fire grate segments are connected with the connecting rods in an inserted mode, a sliding opening is formed in one side of each fire grate segment, a sliding block is movably connected in each sliding opening, the connecting rods penetrate through the sliding blocks, an avoiding groove and a first clamping groove are formed in each sliding block, and the first clamping grooves are connected with the avoiding grooves. A plurality of torsion springs are movably connected to the outer wall of the circumference of the connecting rod, the two ends of each torsion spring are fixed to the connecting rod and the corresponding receding groove respectively, a plurality of first clamping blocks are fixedly connected to the outer wall of the circumference of the connecting rod, the first clamping blocks are movably connected with the first clamping grooves, and a sliding barrel is fixedly connected to one side o