Envelope bag rib-frame is that it should be lightweight, easy to install and maintain, dust bag skeleton directly affects the quality and service life of the filter status. Electrostatic precipitator is electrostatic purification method be collected flue dust of the device. Is the ideal equipment for purification of industrial waste. It mainly depends on the purification of the discharge electrode and the working electrode precipitated these two systems to complete. When a bipolar high-voltage DC input between the electrodes when the space around the anion and cation, and the electrostatic field acting on the particle surface of the gas dust in the electric force of the electrode of opposite polarity to its movement, and deposited on the electrode, to collecting purposes. Bipolar systems, they are rapping device, when the rapping hammer beating bipolar device periodically, adhesion on which dust is shaken off, falling into the lower part of the hopper through the ash discharge device from the plane. Been purified by the exhaust gas outlet through the chimney into the atmosphere, then completed a flue gas purification process.