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A Conical Nut Pushing Pretensioning System

A conical nut, jacking technology, applied in metal processing, metal processing equipment, manufacturing tools, etc., to achieve the effect of firm and reliable pre-tightening, reducing thread stress, and reducing friction coefficient

Active Publication Date: 2017-05-31
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the existing problems of bolt connection under the conditions of large diameter, high temperature and high pressure, the present invention provides a tapered nut jacking and preloading system

Method used

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  • A Conical Nut Pushing Pretensioning System
  • A Conical Nut Pushing Pretensioning System

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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0026] Such as figure 1 , figure 2 , a tapered nut jacking preloading system, the tapered nut jacking preloading system includes a tapered nut body 1, circumferentially evenly distributed small jacking bolts 4 and superhard gaskets 5, the tapered nut body 1 has an outer conical surface with a half-cone angle of θ. In the embodiment, θ is 3 degrees. There are several fins 3 on the outer conical surface. The central hole 2 cooperates with the bolt shank of the fastener. A number of small bolt holes 7 are evenly distributed around the cylindrical threaded central hole 2 in a circular shape, and the number of the small bolt holes 7 varies with the diameter of the tapered nut ...

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PUM

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Abstract

Disclosed is a conical nut pushing and pre-tightening system. The conical nut pushing and pre-tightening system is characterized by comprising a conical nut body (1), small pushing bolts (4) circumferentially and evenly distributed and a superhard gasket (5), the conical nut body (1) is provided with an outer conical surface with a half-cone angle being theta, a plurality of fins (3) are arranged on the outer conical surface, and a through straight thread center hole (2) is arranged in the middle of the conical nut body (1) and matched with a bolt bar of a fastener. The conical nut pushing and pre-tightening system has the advantages of accurate pre-tightening force, easiness in installation, economy, practicality and the like, thereby being particularly suitable for being used on large-scale mechanical equipment under the working conditions of high temperature and high pressure.

Description

technical field [0001] The invention relates to a large-scale jacking and preloading system, and specifically designs a tapered nut jacking and preloading system applied in a high-temperature environment. Background technique [0002] At present, with the development of modern industry, bolted connection is still widely used in important fields such as aerospace and chemical equipment because of its advantages of easy disassembly, low manufacturing cost, and no damage to the connected parts. The pre-tightening of large-size bolts is difficult, the pre-tightening force is difficult to control, the stress concentration at the root of the thread, the thread loosening and locking are serious, and the stress relaxation phenomenon of the bolted connection under high temperature and high pressure conditions has always been a difficult problem in the bolted connection. Contents of the invention [0003] Aiming at the problems existing in bolt connection under the existing large-di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P19/06
CPCB23P19/06
Inventor 陆晓峰冯伟朱晓磊刘路维刘杨
Owner NANJING TECH UNIV
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