Tool for coating sealant on outer surface of nut and coating method

Abstract

The invention belongs to the field of surface treatment of aviation connecting pieces, and relates to a tool for coating the outer surface of a nut with sealant and a coating method. The tool is composed of a sealing cover and a plugging column. A cavity capable of containing a bolt is formed in the sealing cover, a boss is arranged at the upper end of the sealing cover, a through hole is formed in the center of the boss, the diameter of the through hole is matched with the outer diameter of the plugging column, and the through hole is used for glue injection and positioning. A step shaft is arranged at one end of the plugging column, a plug is arranged at the front end of the step shaft, and the plug can penetrate through the through hole to be used for compacting the sealant and ensuring that gas in the sealant is exhausted from the through hole; and a positioning shaft is arranged at the other end of the plugging column, penetrates through the through hole and is matched with a mark at the top end of the internal nut to realize positioning of the sealing cover and the nut.

Description

technical field [0001] The invention belongs to the field of surface treatment of aviation connectors, and relates to a tool for coating sealant on the outer surface of nuts and a coating method. Background technique [0002] In order to ensure the tightness of the helicopter body structure and realize the rain / water protection function, it is necessary to apply sealant to each joint of the body structure. The invention provides a tool for applying sealant to bolt joints. The current sealant adopts the "wet assembly and installation" process. In order to directly apply the polysulfide sealant on the surface of the exposed screw fasteners with tools such as glue guns, brushes, and scrapers, it will cause uneven coating of the sealant and weight loss. Inconsistency, and the problem of poor aesthetics after the glue is solidified; if a cover structure is designed around the bolts to ensure the amount of glue, but this structure is difficult to achieve the coaxiality of the bol...

AI Technical Summary

Problems solved by technology

The current sealant adopts the "wet assembly and installation" process. In order to directly apply the polysulfide sealant on the surface of the exposed screw fasteners with tools such as glue guns, brushes, and scrapers, it will cause uneven coating of the sealant and weight loss. Inconsistency, and the problem of poor aesthetics after the glue is solidified; if a cover structure is designed around the bolts to ensure the amount of glue, but this structure is difficult to achieve the coaxiality of the bolts and the cover, and it is difficult to ensure that the bolts are difficult to locate. Uniform thickness of sealant applied all around

[0003] On the one hand, traditional manual glue application is difficult to ensure the amount of glue applied and the thickness of the sealant applied; after the sealant is applied, during the curing process of the sealant, the liquid sealant is prone to flow, resulting in the thickness of the sealant applied around the nut. Uneven, the thickness of the sealant in the upper part is less than the actual requirement

After curing, the appearance is irregular; trapped air bubbles are prone to appear inside the sealant; in order to avoid the existence of air bubbles, other auxiliary means are usually required, and the operation process is cumbersome

Images