... This utility model relates to a material connection devices, specifically relates to a plate connected to plate connector. Background Technology All ... way to connect with nails or screws with fixed, which will result in a lot of inconvenience to transport from production, to installation ... plate, 6, helical gear, 7 pin, 8, positioning holes, 9, plywood, 10 journal sets, 11, spiral groove, 12, screw ...