Stem concentricity test fixture

By designing front and rear positioning fixtures and beam assemblies, the problems of poor accuracy and versatility in stern tube concentricity testing were solved, achieving precise coaxiality testing and wide applicability.

CN117329993BActive Publication Date: 2026-06-09CHENGXI SHIPYARD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHENGXI SHIPYARD
Filing Date
2023-09-22
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing stern tube concentricity testing fixtures cannot adapt to various stern tube specifications and are difficult to accurately snap into the maximum diameter position, resulting in poor accuracy and poor versatility.

Method used

It adopts a front positioning fixture and a rear positioning fixture, which are equipped with a positioning beam transmitter and receiver respectively. Combined with the upper sharp corner positioning component and the lower sliding contact component, it achieves precise coaxiality testing through elastic buckle protrusions and arc-shaped slots.

Benefits of technology

It improves the precision and accuracy of coaxiality testing, ensures that the clamp is at the maximum diameter position, and enhances the versatility of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a stern tube concentricity testing fixture, comprising a front positioning fixture and a rear positioning fixture. The front positioning fixture includes upper and lower U-shaped adjusting components, two central insertion sleeves, an upper pointed corner positioning component, a lower sliding contact component, and a central beam positioning component. The central beam positioning component includes a positioning beam emitter, an upper position adjusting component, a positioning beam receiver, a lower position adjusting component, and a central moving component. The central moving component has a vertical sliding groove and transverse mating grooves along both sides. The upper position adjusting component is fixedly connected to the positioning beam emitter and adjusts its position, while the lower position adjusting component is fixedly connected to the positioning beam receiver and adjusts its position. The positioning beam emitter and receiver of the front and rear positioning fixtures cooperate to complete the coaxiality test. The coaxiality test has high precision and accuracy; if any set does not align, the part is determined to be scrapped.
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Citation Information

Patent Citations

  • Coaxial measuring tool and measuring method

    CN100392350C

  • Main engine axis positioning method and measuring device

    CN1776360A

  • Correcting device and method of marine shafting stern tube

    CN110695677A

  • Coaxial measuring tool and measuring method

    CN1624422A