#$%^&*AU2011244841B220140508. ABSTRACT pdf#####1 nozzle assemblies comprising at least one wear part (70,150) had by hard and wear-resisting material and protection shell (110) by high-intensitive and elastic material and downstream chamber (118) be suitable for receiving one or more 5 (70,150) relationship releasedly trapped in wearing terrain, downstream chamber (118) wall (134) have include column (137) limit slot (138) wall (70,150) 0 downstream chamber two heel posts (70,150) 1, column (70,150) 2 include extend internally protrusion (70,150) 3 at or close to end and being suitable for prevent wearing piece (70,150) the 4 evolution downstream chamber (70,150 )5
