Pneumatic Device for Cleaning Ventilation Ducts

A pneumatic device for cleaning ventilation ducts, comprises guiding air hammer, turning conduit, air-supply pipe, and slewing mechanism for the conduit, said guiding air hammer being a hollow spherical or hemispherical shape, which is connected to the turning conduit, and the other end of said turning conduit connected fixedly with the turning pipe of the slewing mechanism for the conduit, and the air-supply pipe connected with the air inlet pipe on the other end of the slewing mechanism for the conduit,

• wherein jets of air for cleaning and jets of air for guiding are formed on the rear arc wall of said guiding air hammer, in which said jets of air for cleaning are several proportionally distributed centripetal holes, whose center lines make an angle of 35°-65° with the center line of guiding air hammer, and said jets of air for guiding are two centripetal holes, whose center lines make an angle of 65°-80° with the center line of guiding air hammer, and the two center lines of jets of air for guiding make an angle of 75°-105° with each other;
• and
• said slewing mechanism for the conduit comprises shell, stepper motor, revolving seal, turning pipe, air inlet pipe, and air inlet cover, in which the stepper motor is arranged in the back of said shell, and there is space between stepper motor and the shell, and the air inlet cover is arranged on the shaft extension of drive shaft of stepper motor, and said revolving seal is installed in the front side of shell, and the turning pipe is arranged inside the revolving seal, the turning pipe connects fixedly with the air inlet cover, and the air inlet pipe connects fixedly to the rear end of the shell.