Comparison measuring tool for measuring shallow diameter of small-diameter blind hole of aviation spline

CN224285758UActive Publication Date: 2026-05-26HARBIN XINHUA AVIATION IND CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Utility models(China)
Current Assignee / Owner
HARBIN XINHUA AVIATION IND CO LTD
Filing Date
2025-07-15
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies cannot accurately measure the shallow diameter of small blind holes in aerospace splines, and the measurement error caused by fixture changes is large, affecting the accuracy and consistency of measurement data.

Method used

A comparative measuring instrument comprising a measuring frame, a measuring gauge, and an adaptive mounting clamp assembly is designed. The clamping plate is moved by a stud, and the movable connection between the slider and the vertical rod enables automatic adjustment of the clamping distance, ensuring uniform distribution of clamping force. The instrument adopts a double-set symmetrical clamping plate unit and a cylindrical rod penetrating the slider structure to adapt to the installation requirements of different gauge sizes and reduce offset errors.

Benefits of technology

It enables precise measurement of the shallow diameter of small blind holes in aerospace splines, reduces measurement errors, improves the accuracy and consistency of measurement data, adapts to the rapid clamping of gauges of different specifications, and reduces the risk of gauge displacement caused by vibration.

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Abstract

The utility model relates to the technical field of blind hole shallow diameter measurement, and discloses a contrast measurement tool for measuring the shallow diameter of a small-diameter blind hole of an aviation spline, which comprises a measuring frame and a measuring meter, a groove is arranged in the middle of the front end of the measuring frame, two groups of side frames are fixedly arranged on two sides of the rear end of the measuring frame, and the measuring meter is arranged in the groove. A self-adaptive mounting clamp assembly is arranged between the two groups of side frames and the measuring meter; the self-adaptive mounting clamp assembly comprises a clamping plate unit, a cylindrical rod and a stud. A stud is arranged to push the clamping plate body to move, and a movable connecting structure of a sliding block and a vertical rod is matched, so that the clamping distance can be automatically adjusted according to the boundary dimension of the measuring meter, and the mounting requirements of scales of different specifications are met; the double-group symmetrical design of the clamping plate unit is arranged, and the cylindrical rod movably penetrates through the two groups of sliding blocks, so that the uniform distribution of clamping force is ensured; offset errors caused by asymmetric stress of the measuring meter are avoided, and comparison measurement is carried out through three points of the rounded corners of the side frames on the two sides of the rear end of the measuring frame and the meter head of the measuring meter at the center of the groove.
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