Building material manufacturing apparatus

A building material manufacturing apparatus comprising:

• a screen part that includes at least one screen sheet that has an inclination and that has a screen mesh;
• and
• a cleaning mechanism part that includes a scraping part,
• wherein, when the apparatus operates in a building material manufacturing mode in which a building raw material is supplied to the screen sheet and the screen sheet is performing a wave motion, the scraping part is separated from the screen sheet, and
• wherein, when the apparatus operates in a cleaning mode in which the building raw material is not supplied to the screen sheet and the screen sheet is not performing a wave motion, the scraping part rotates in contact with the screen sheet,
• wherein the cleaning mechanism part includes a suction part for sucking the building raw material, and a blowing part for blowing air,
• wherein the suction part and the blowing part are positioned at opposite sides of the scraping part,
• wherein the blowing part is for blowing air toward the scraping part, the blowing part being provided on an upper side of the scraping part in a direction of the inclination of the screen sheet.