Inner wall cleaning corner brush mechanism of cleaning machine

The invention discloses an inner wall cleaning corner brush mechanism of a cleaning machine, belongs to the field of train open carriage cleaning equipment, and aims to solve the problem that dead corners of a train open carriage are difficult to clean thoroughly by an existing train cleaning machine. Comprising a sweeping frame, sweeping supporting arms and a sweeping disc, the top ends of the two sweeping supporting arms are correspondingly hinged to the left portion and the right portion of the sweeping frame respectively, two air cylinders are hinged to the middle of the sweeping frame through lug rings, piston rods of the two air cylinders are hinged to the two sweeping supporting arms through lug rings respectively, and the sweeping disc is rotationally arranged on the sweeping supporting arms; when piston rods of the two air cylinders retract, the two sweeping supporting arms rotate oppositely, the two folded sweeping supporting arms conveniently enter and exit the train carriage without collision, and