Dust collection hood for grinding machine tools

A grinding machine tool comprising a driving motor, at least one grinding portion driven by the driving motor to rotate, and a dust collection hood for holding the grinding portion, the dust collection hood comprising:

• a circumferential wall surrounding the grinding portion;
• and
• a dust collection cap which is coupled with the circumferential wall to form a dust collection chamber to house the grinding portion and includes a top, an inclined plane tapered from the circumferential wall to the top, a dust discharge port located on the inclined plane and communicating with the dust collection chamber, and an airflow guiding channel formed on the inclined plane and extended from the dust discharge port toward the circumferential wall, the airflow guiding channel being recessed in a direction remote from the dust collection chamber to guide airflow from the dust collection chamber to the dust discharge port,
• wherein the airflow guiding portion is centered on the top and formed helically therefrom on the dust collection cap in an annular manner.