Concrete spraying machine with auger mortar supply - has annular mixing air nozzle surrounding supply pipe outlet into mixing chamber

摘要

The spraying machine is particularly for wet concrete, having a supply pipe for the prepared material leading to an air mixing chamber, the latter with a union for a spray hose. The material in the supply pipe (1) is delivered solely under pressure or vacuum, e.g. by pumping, and continuously. To mix air with it, an annular nozzle (15) is provided near the hose union (10) in the mixing chamber (2), surrounding the pipe outlet (14) into the chamber directly, and preferably coaxial to it. The cross-section of the pipe can be constant as far as the outlet into the chamber, and the nozzle can be formed between the outside of the pipe and the inside of the chamber.