Self-locking charging hopper

A material processing apparatus, comprising:

• a chassis;
• and
• a charging hopper, including;
• first and second walls pivotably mounted relative to the chassis, the first wall being one of a rear wall and at least one side wall, and the second wall being the other of the rear wall and the at least one side wall;
• a first actuator connected between the chassis and the first wall and configured to adjust the first wall between a folded-down transport position and a folded-out working position;
• a second actuator connected between the chassis and the second wall and configured to adjust the second wall between a folded-down transport position and a folded-out working position;
• at least one deflection member configured to convert a movement of the first actuator during a portion of the movement of the first actuator into a rotational movement of the first wall, and during a further portion of the movement of the first actuator into a translational movement of the first wall;
• and
• at least one releasable closure configured such that in the transport positions of the first and second walls, the first wall is releasably connected to the second wall, and such that the releasable closure is lockable and unlockable by movement of the first wall.