Does it violate the principle of equality to prevent students from eating in the staff canteen?

Because students are canteens with students and teachers are canteens with teachers. Issues that do not involve the principle of equality.

Faculty is the abbreviation of school teachers, staff, teaching assistants and workers. Teachers refer to professionals who are directly engaged in education and teaching, staff refer to those who are engaged in school management, teaching assistants refer to those who are mainly engaged in teaching experiments, books, audio-visual education, health care and other teaching AIDS, and workers refer to school logistics service personnel.