... 3. Processing good quality; 4. Environmental protection; 5. Labor-intensity; Tower outer wall automatic shot blasting machine ... efficiency. And the traditional type need about 5 person working 10-12 hours, but it’s ... only need 2 person working 6-8 hours.3. Processing good ... environment fresh, eliminate pneumoconiosis. 5. Labor-intensity, it only needs 1-2 person to operating, No need ...