Grate of incinerator

In a refuse-supporting grate of an incinerator, comprising a plurality of hollow rotary cylindrical drums each having an outer peripheral surface receiving refuse thereon, each drum having a central axis and including a plurality of grate bars extended parallel to each other and forming said outer peripheral surface, grate bar carriers extended parallel to said central axis, said grate bars being suspended in the direction transversal to said central axis between said carriers and on the latter so that between each two adjacent grate bars air slots are formed, each grate bar including a head portion having two side faces which are straight-line and smooth, the improvement comprising spaces between said grate bars, said grate bars each further including a foot portion having two opposite lateral faces, said spacers being positioned in pairs between the one lateral face of one grate bar and the lateral face of the adjacent grate bar, facing towards said one lateral face, the spacers in each pair having abutting surfaces abutting against each other, said abutting surfaces being flat and smooth, each of said suspended grate bars having two opposite recesses and two extended portions above said recesses, said bar carriers being partially inserted in said recesses, each bar carrier being inserted into an assigned recess so that the play occurs between the respective extended portion of the suspended grate bar and the respective bar carrier at operation temperature.