Double-sided seven-roller structure

The utility model discloses a double-faced seven-roller structure which comprises a protection box, a box door is arranged on the front face of the protection box, a supporting plate is fixedly installed at the bottom of the protection box, and the left side of the top of the protection box is communicated with an exhaust funnel. The protection box is used for preventing dust and protecting the device body, dust is prevented from directly falling on the surface of the device body and affecting use of the device body, air in the protection box is exhausted through the exhaust funnel under the action of the ventilation motor, the sealing plate is opened under the impact of airflow, and the device body is prevented from being damaged. Air is exhausted through the exhaust cylinder, external air enters the protection box through the air inlet cylinder, dust in the air is filtered when the air passes through the filter screen, and meanwhile the problems that dust is prone to falling on the surface of an existing se