Prevent riser block , cardboard subassembly of scurrying out

The utility model relates to a prevent riser block, cardboard subassembly of scurrying out. This product adopts supporting the installing and use of two parts of riser block and cardboard, and riser block thickness 1 -4mm vary, and the riser block main aspects are downward during the installation, and the M16 bolt fastening is on the braking pincers for the cardboard. Riser block designs " protruding " shape structure, upper portion size 90mm, and lower part size 122mm, total height 90mm, the high 34mm of lower part size, arc shape is adopted to riser block width joint portion, remains throughout in the work at well position, and the atress is even. Cardboard design becomes " concave " shape structure, groove width 100mm, and groove depth 98mm, the high 63mm of cardboard, the middle part is equipped with the installation slot hole. " protruding " shape riser block after the improvement is locked in " concave " shape cardboard, the phenomenon can not appear scurrying out under external force is strikeed, has r