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Precise pre-tightening bolt

A pre-tightening bolt, accurate technology, applied in the direction of screws, threaded fasteners, measuring devices, etc., can solve the problems of large pre-tightening force error, inconvenient pre-tightening, and inability to judge whether the pre-tightening of bolts is loose, etc., to achieve accurate pre-tightening tightening and improving durability

Pending Publication Date: 2018-09-25
SHANGHAI WINNER ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an accurate pre-tightening bolt, which can solve the problems of large pre-tightening force error during pre-tightening installation, inconvenient pre-tightening, and inability to judge whether the bolt pre-tightening is loose

Method used

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Examples

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] like figure 1 and figure 2 As shown, a precision pre-tightened bolt includes a head 101 , a screw 102 , a mandrel 103 , an indicator wheel 104 , an indicator cap 105 and grease 106 .

[0022] One end of the screw rod 102 has no threads, and the other end of the screw rod 102 is provided with threads. A blind hole 102-1 is provided on the end surface of the screw rod 102 without thread. The head 101 is provided with a through hole 101-1 having the same diameter as the blind hole 102-1. One end without thread on the screw rod 102 is fixed with the hexagonal head 101 .

[0023] The mandrel 103 is disposed in both the through hole 101-1 and the blind hole 102-1. The bottom of the blind hole 102-1 is close to the threaded end of the screw rod 102, the bottom of the blind hole 102-1 is provided with a threaded hole 102-2, one end of the ...

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PUM

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Abstract

The invention provides a precise pre-tightening bolt. The precise pre-tightening bolt comprises a head, a screw, a mandrel and an indication wheel, wherein a through hole is formed in the end surfaceof the head, a blind hole is formed in one end of the screw, the end, where the blind hole is formed, of the screw is fixed with the head, and the though hole is coaxial with the blind hole; the mandrel is located in the through hole and the blind hole, one end of the mandrel is arranged at the bottom of the blind hole, the other end of the mandrel penetrates through the through hole and is fixedwith the indication wheel, and the distance between the indication wheel and the end surface of the head is the height increase distance of the blind hole after the precise pre-tightening bolt is mounted and reaches required pre-tightening force. The precise pre-tightening bolt has the advantages that the precise pre-tightening bolt can solve the problems that the pre-tightening force errors are large during pre-tightening mounting, pre-tightening is inconvenient and whether bolt pre-tightening is loose or not cannot be judged.

Description

technical field [0001] The invention relates to a bolt, in particular to a precise pre-tightening bolt. Background technique [0002] As a widely used mechanical fastening and connecting piece, bolts play a vital role in steel, petrochemical, heavy equipment and other fields. During operation, the bolt pre-tightening force should reach the predetermined design value, so as to ensure that the equipment will not cause stress relaxation due to factors such as vibration, sliding, fatigue, and pressure and temperature changes during operation. According to statistics, 90% of bolt connection failures are caused by insufficient pre-tightening force during installation. For pressure vessels, wind turbines and other equipment, the failure of bolted connections will cause toxic and harmful gas leakage, equipment collapse and other major losses. [0003] Traditional bolt installation methods include manual tapping, torque wrench and hydraulic bolt tensioner. These three installation...

Claims

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Application Information

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IPC IPC(8): F16B35/00G01B5/02
CPCF16B35/00G01B5/02
Inventor 张振亚
Owner SHANGHAI WINNER ENG
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