Auxiliary tool for locally plating titanium nitride

The utility model belongs to the field of auxiliary tools, and relates to a local titanium nitride plating auxiliary tool which comprises a positioning shaft seat, an outer protective cylinder arranged on the positioning shaft seat and an outer protective cover arranged at the top of the outer protective cylinder, an inner gear ring shell is installed on the positioning shaft seat, and titanium nitride plating and coating of a gear part are achieved through the outer protective cover and the outer protective cylinder. According to the position, needing to be protected, of a product, titanium nitride plating is conducted in equipment, the whole space is filled with gasified plating elements, the main principle is that non-plating parts are protected through physical isolation, due to the fact that the size is large, sectional welding is adopted, materials are saved, and the tool is simple in design, convenient to disassemble and replace and low in machining cost; and the device can be repeatedly used and is wi