Self-cleaning device for die of paper tray packaging forming machine

The invention provides a self-cleaning device for a die of a paper tray packaging forming machine, the self-cleaning device comprises an upper die and a lower die which are matched with each other, the lower die comprises a base and a die body, the die body comprises a bottom plate and a protruding block, a first cavity is formed in the protruding block, a second cavity is formed in the base, andthe first cavity is communicated with the second cavity through a through hole; a plurality of suction holes are formed in the top surface and two opposite side walls of the protruding block; a filterplate is fixedly arranged at the outer end of the suction hole; a sliding block is slidably arranged on the inner side of the suction hole; the sliding block is provided with a plurality of contact pins corresponding to the filter holes; push rods are arranged on the sides, away from the filter plates, of the sliding blocks, the push rods located on the same wall face are connected with the corresponding first push plates