Round hole protection structure

By designing the rod and elastic sheet of the circular hole protection structure, the problem of circular holes being blocked during the painting process is solved, enabling protection of circular holes of different sizes and improving painting efficiency and assembly accuracy.

CN224332437UActive Publication Date: 2026-06-09SHANGHAI AIRCRAFT MFG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI AIRCRAFT MFG
Filing Date
2025-06-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

During the painting process, the round holes on the workpiece are easily clogged by paint, resulting in smaller hole diameters and reduced assembly accuracy. Existing silicone plugs require multi-specification management and frequent replacement, which affects the painting efficiency.

Method used

A circular hole protection structure is adopted, including a rod and an elastic sheet. The elastic sheet is wound around the outer periphery of the rod and inserted into the circular hole. The elastic sheet is used to tightly fit the inner wall of the circular hole by utilizing its elasticity, adapting to circular holes of different sizes and forming an adaptive seal.

Benefits of technology

No need for multi-sized silicone plugs, easy to operate, improves spraying efficiency, prevents paint from entering the round hole, maintains the hole diameter, reduces replacement time, and improves assembly accuracy.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN224332437U_ABST
    Figure CN224332437U_ABST
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Abstract

This utility model belongs to the technical field of auxiliary equipment for spraying processes, and discloses a circular hole protection structure. This circular hole protection structure is used to protect the circular hole of the workpiece to be sprayed. It includes a rod and an elastic sheet. The rod is inserted into the circular hole of the workpiece to be sprayed. One end of the elastic sheet is fixedly connected to the rod, and the other end of the elastic sheet can be wound around the outer circumference of the rod. The elastic sheet has a wound state and a springback state. When the elastic sheet is in the wound state, the outer wall of the elastic sheet is always separated from the inner circumferential wall of the circular hole of the workpiece to be sprayed, so that the elastic sheet can be inserted into the circular hole. When the elastic sheet is in the springback state, the outer wall of the elastic sheet is tightly attached to the inner circumferential wall of the circular hole of the workpiece to be sprayed. The circular hole protection structure provided by this utility model can adapt to circular holes of different sizes, is easy to operate, and improves the efficiency of spraying operations.
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