A bolt capable of predicting pre-tightening elongation and measuring method

A technology of elongation and length measurement, which is applied to measuring devices, mechanical measuring devices, screws, etc., can solve the problems of low control accuracy and cumbersome measuring methods, so as to simplify the measuring method, improve the measuring accuracy and assembly efficiency, and achieve accurate measurement. Effect

Active Publication Date: 2018-02-02
LUOYANG SUNRUI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] In order to overcome the cumbersome and low control accuracy of the existing bolt pretension stress measurement method, the purpose of this invention is to propose a bolt and measurement method that can measure the pretension elongation.

Method used

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  • A bolt capable of predicting pre-tightening elongation and measuring method
  • A bolt capable of predicting pre-tightening elongation and measuring method
  • A bolt capable of predicting pre-tightening elongation and measuring method

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Embodiment Construction

[0043] The present invention is described in conjunction with accompanying drawing and specific embodiment:

[0044] like figure 1As shown, a bolt that can measure the pre-tightening elongation, the bolt has a bolt head 1 and a bolt shaft 2; the bolt shaft 2 is connected to the lower end of the bolt head 1; the bolt shaft 2 is from top to bottom Be followed by a polished rod and a screw rod; the center of the bolt head 1 and the center of the polished rod of the bolt rod 2 all have a through hole for the length measuring rod 5 to pass through; the center of the screw rod of the bolt rod 2 has a The threaded hole of the threaded connection, and the diameter of the threaded hole in the center of the bolt shank is larger than the diameter of the through hole of the bolt shank; combined figure 2 , the length measuring rod 5 has a threaded section 3 and a measuring section 4 arranged sequentially from top to bottom, the diameter of the threaded section 3 of the length measuring r...

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Abstract

The invention belongs to the technical field of fastener design, and in particular relates to a bolt capable of measuring pre-tightening elongation and a measuring method. A proposed bolt with measurable pretension elongation has a bolt head (1) and a bolt shank (2); the bolt shank (2) is a polished rod and a screw from top to bottom; the center of the bolt head (1), the bolt The center of the rod (2) polished rod has a through hole for the length measuring rod (5) to pass through; the center of the bolt rod (2) screw rod has a threaded hole threaded with the length measuring rod (5); the length measuring rod (5) ) has a threaded section (3) and a measuring section (4) arranged sequentially from top to bottom; the end face of the measuring section (4) of the length measuring rod is a plane and is perpendicular to the axis of the length measuring rod (5); the bolt head (1 ) is a plane perpendicular to the axis of the length measuring rod (5). Under the condition of not changing the current bolt installation structure, the invention achieves the purpose of accurately measuring the elongation of the tension rod portion of the bolt, and realizes the precise control of the bolt pretightening stress.

Description

technical field [0001] The invention belongs to the technical field of fastener design, and in particular relates to a bolt capable of measuring pre-tightening elongation and a measuring method. Background technique [0002] Bolts are widely used in various links of the national economy such as ships, machinery, construction, bridges, etc., and are called "industrial rice"; they have the advantages of strong versatility, low installation cost, and repeatable disassembly and assembly. [0003] In order to ensure the rigidity, reliability, sealing, anti-loosening of the connection structure and improve the fatigue strength of the bolts and other application requirements, most of the bolts need to be pre-tightened during the installation process: that is, a certain pre-tightening stress is applied to the bolts during assembly; A large number of tests and experience have proved that: higher preload is beneficial to the reliability of the connection and the life of the connected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B5/02F16B35/00
CPCF16B35/00G01B5/02
Inventor 范芳雄刘军罗亮朱晓锋
Owner LUOYANG SUNRUI SPECIAL EQUIP
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