Patent ID: 7204882

Claim:
A polyurethane resin coating device for coating a substrate comprising: a material mixing unit provided for receiving preset materials and carrying out mixing, said materials mixed and reacted to form polyurethane resin liquid mixture, said polyurethane resin liquid mixture flowing out downward; a pressuring and sending unit formed with a pressuring chamber communicating with said material mixing unit, said pressuring and sending unit receiving said polyurethane resin liquid mixture flowing out of said material mixing unit, said pressuring chamber of said pressuring and sending unit installed with at least one rotary helical rod in the interior, said helical rod mixing said polyurethane resin liquid mixture again and then pressuring it out; a gear pump communicating with said pressuring chamber of said pressuring and sending unit, said gear pump receiving said polyurethane resin liquid mixture pressured out of said pressuring and sending unit, said polyurethane resin liquid mixture controlled by a rotating speed of gears in said gear pump and conveyed outward with steady flow through an outlet of said gear pump; and a coating wheel provided at the location of said outlet of said gear pump, said coating wheel receiving said polyurethane resin liquid mixture flowing out of said gear pump through said outlet, a gap of proper size formed between the wheel surface of said coating wheel and said outlet of said gear pump, said gap adjustable in size for controlling a coating thickness of said polyurethane resin liquid mixture on said substrate, wherein said material mixing unit is formed with a material mixing head having its central portion bored with a longitudinal mixing groove provided therein with an actuating helical rod, said material mixing head having its peripheral side provided with plural material intake members and a connecting member, specific materials injected in said mixing groove through said material intake members and said connecting member.