Method and apparatus for the application of mortar or concrete by spraying

A device for the application of mortar or concrete by spraying, comprising:

• a first loading station for dispensing a binding agent into a pneumatic stream;
• a second loading station for dispensing an admixture into said pneumatic stream;
• and
• a pneumatic conveyor for pneumatically transferring said binding agent and said admixture within said pneumatic stream to a spray nozzle for adding water, wherein said binding agent is mixed with said admixture during the pneumatic transfer.

A device for applying mortar or concrete to a surface spraying, comprising:

• a pneumatic conveyor for creating a pneumatic stream;
• a hopper for introducing an admixture into said pneumatic stream through an inlet of said pneumatic conveyor;
• and
• a mechanical conveyor for introducing a binding agent into said hopper adjacent an outlet of said pneumatic conveyor, wherein said admixture and said binding agent are combined in said hopper immediately before being transported in said pneumatic stream to a spray nozzle, wherein said binding agent and said admixture become pneumatically mixed within said pneumatic stream while being pneumatically transported to said spray nozzle;
• and
• a rotor below said hopper which rotates in a rotational path on a vertical axis, wherein said rotor includes a plurality of vertical chambers which are, on a first portion of said rotational path of said rotor, open on the top and closed on the bottom, and on a second portion of said rotational path of said rotor, open on both the top and the bottom, wherein said vertical chambers are arranged between said inlet and said outlet of said pneumatic conveyor.