Protective cover for automatically opening and closing skylight of chemical fertilizer stirrer

A protective cover for automatically opening and closing a skylight of a chemical fertilizer stirrer comprises an upper cover, a circumferential plate and a skylight cover plate, and is characterized in that the upper cover and the circumferential plate are fixedly connected into a whole at the combined junction through electric welding; the upper cover is provided with a motor fixing area, the motor fixing area is provided with equant motor fixing holes, and the motor fixing area is provided with a central hole; the motor fixing area is provided with an equally-divided skylight opening towards the radial outer portion, the skylight opening is similar to a trapezoid shape and extends from an arc line towards the radial outer portion to an outer side line, the outer side line of the skylight opening is a straight line, and hinge fixing holes are formed in the positions adjacent to the outer portion of the outer side line. Grid holes are formed in the section of the circumferential plate. The shape and size dat