SJQ Series numerical control ball feeding machines are suited to automatically feed ball during ball mill operation in metallurgical, power, chemical and coal industries etc. They can stabilize the load of ball mill, raise grinding efficiency, reduce power consumption and save steel balls and are characterized by novel and rational structure, simplicity and practicability, reliable operation, and no ball blockage. An automatic ball feeding at production-dependent timd and quality is made possible by a single-chip computer.