Extension brake box for mine electric wheel self-dumping truck

The utility model discloses an extension brake box for a mine electric wheel self-dumping truck. The extension brake box is characterized by comprising a box door, a box shell, a sealing strip and a hinge, wherein a box opening is arranged at the upper surface of the box shell; a convex edge is arranged at the edge of the box opening; the hinge is divided into a female sleeve and a male sleeve; the male sleeve is welded at the upper surface of the box shell near the convex edge; the female sleeve is welded at the side of the box door; the female sleeve of the box door is inserted into the male sleeve; the sealing strip is of a self-clamping type and embedded in the convex edge of the box opening; a door lock is arranged on the box door; and a spring bolt of the door lock can rotate relative to the box door. The convex edge is arranged at the edge of the box opening of the upper surface of the box shell; the self-clamping sealing strip is embedded on the convex edge, and then the box door is pressed on the sea