(3)Mechanical automatic scraper oil , the oil-scraping system which control system is designed with intermittent operation function, save power, lower noise , meantime lengthen scraper lifetime. (4) Apply to any kinds of oil, oil-taking concentration without any limit, can widely used in natural petroleum and petroleum products,oil tar and oil tar fraction,animal and plants oil and wool grease etc waste-water project, specialized using in catering industry oily waste-water treatment.