Wet dry concrete spraying machine

Concrete spraying technology is a method of machine spraying of reinforced and non-reinforced concrete layers on vertical walls, in particular, and ceilings which can be of irregular shapes.

Concrete sprayer machine works on the principle of pneumatic transport of concrete mixture, it is divided into dry mix shotcrete machine and wet mix shotcrete machine according to different adding water processes.

For the dry concrete spraying machine, the dry mixture for spraying or transportation is poured into the machine and smoothly fills the cylinders of the rotor below the hopper. A vibrator and a rippling are fitted in the hopper to fill a mixture into the rotor more easily. The rotor's rotating movement moves the mixture by 180°in the clockwise direction. The mixture is thus blown out from individual cylinders of the rotor into transport hoses. As the mix passes through the blower into the transport hoses, lower-pressure air is added to enhance the continuous flow of the material in the hoses. The hoses are equipped with spraying nozzles at the end, into which the mixing water is fed to wet the transported mixture. The required wetting of the mixture is controlled with the supply cock. Dry shotcrete is based on the pneumatic transport of dry mixtures and their moistening at the moment of actual spraying. The dry mixture is transported from the machine (concrete spraying machines, shotcrete machines) to the place of spraying by transport hoses with spraying jets and gauge water to moisten the sprayed mixture as required.

Compared with wet mix concrete spraying machines have follow advantages:

1. Contrary to the dry method, the generation of dust is almost eradicated and the falling off of the material is significantly reduced to about 10%.

2. It is also possible to adjust the water coefficient W/C more efficiently and the quality of sprayed concrete is not affected as much by the service personnel as they are not required to adjust the water flow.

spraying concrete machine is used in particular for:

1. Preliminary sealing with the hardening agent

2. Primary sealing of concrete and rocks

3. Grouting brickwork and panels

4. Plastering bigger concrete areas

5. Maintenance work in shafts and tunnels

6. Reinforcement of slopes

7. Repairs and lining of furnaces, boilers, range of coke ovens, etc. in hot or cold environments