IN-STACK CLEANING DEVICE

PROBLEM TO BE SOLVED: To troubleshoot such a problem which demands for a special skill and much labor in an attempt to clean the inside of a stack according of a prior art cleaning method and cleans the internal wall surface of the stack or troubleshoot such a problems as detachment of the internal wall surface of the stack or disappearance of a joint area in the case when sandblast is used to clean the internal wall surface. SOLUTION: According to this invention, an in-stack cleaning device comprises a fixing board 13 mounted on a support post 12, a sliding board 14 mounted slidably on the support post 12 in the upper part of the fixing board 13, a plurality of aggregate members 16 which connect two rods turnably and connect turnably both ends of the fixing board 13 and the sliding board 14 and are deflected in the shape of < outwardly in the radial direction from the support post 12, a brush 11 provided outside the deflected areas of the aggregate members 16, a spring 18 which energizes two rods 15 so that they may be deflected more deeply and a hanger member 19 which hangs the support post 12.