Air tightness detection device for cuboid material bag filled with particle materials

A device for detecting air tightness of a cuboid material bag filled with particle materials comprises a conveyor, a side pushing air cylinder is arranged on a longitudinal beam on the left side of the conveyor, a side pushing plate is arranged at the cylinder rod end of the side pushing air cylinder, a detection vertical plate is arranged at the rear end of the side pushing plate, a door frame is further connected to longitudinal beams on the two sides of the conveyor, and a normal position switch is arranged on one side of the upper end of the door frame. A normal position switch is arranged on one side of the upper end of the portal frame, an air leakage position switch is arranged on the right side of the normal position switch, a side blocking air cylinder is arranged on the other side of the upper end of the portal frame, a cylinder rod of the side blocking air cylinder is hinged to the left end of a bent arm, and a side baffle is arranged at the lower right end of the bent arm. And when the control sys