Patent ID: 8262758

Claim:
An equipment for adding abrasive particles into a mold in even distribution, array pattern and orientation comprising: an adsorbing releasing apparatus and a blind hole feeding tropism board; said adsorbing releasing apparatus being composed of a plurality of acicular soft magnetic metallic sticks, an upper and a lower nonmagnetic material stators, and a plurality of windings; the plurality of windings being wound on the plurality of acicular soft magnetic metallic sticks respectively to form a plurality of electromagnets; said plurality of electromagnets being fastened by said upper and lower stators; each electromagnet forming an electric circuit through a electrical source, a resistance, and a switch; a plurality of blind holes being distributed on face of the blind hole feeding tropism board; arrangements in density, figure, number, and laying area for said plurality of electromagnets can be assembled discretionarily according to requests of products; arrangements of the density, figure, number, and laying area of the blind holes on said blind hole feeding tropism board are corresponding to the arrangements of the plurality of electromagnets.