Unlock instant, AI-driven research and patent intelligence for your innovation.

Bolt pretightening force attenuation testing device and testing method in vibration process

A technology of bolt pretightening force and testing device, which is applied in the direction of measuring device, testing of mechanical components, testing of machine/structural components, etc. It can solve problems such as inability to accurately identify nut rotation and non-rotation, loss of pretightening force, etc. , to achieve the effect of simple structure, convenient adjustment and wide application range

Pending Publication Date: 2021-11-12
JIANGSU XCMG CONSTR MASCH RES INST LTD
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bolt pre-tightening force attenuation test device and testing method in the vibration process to solve the problem in the prior art that the pre-tightening force loss caused by the rotation and non-rotation of the nut cannot be accurately identified

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bolt pretightening force attenuation testing device and testing method in vibration process
  • Bolt pretightening force attenuation testing device and testing method in vibration process
  • Bolt pretightening force attenuation testing device and testing method in vibration process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as Figure 1 to Figure 4 As shown, a bolt pre-tightening force attenuation test device in the vibration process includes a bracket 10, a bolt fixing and pre-tightening force testing unit 7, a tested bolt assembly 4 and an angle testing unit 5, and a bolt fixing and pre-tightening force testing unit 7 Including the bolt fixing sleeve 7.7 fixed on the bracket 10 and the pressure sensor 7.4 arranged on the outer periphery of the bolt fixing sleeve 7.7, the outer periphery of the bolt fixing sleeve 7.7 is also fixed with a connecting plate 7.3; the tested bolt assembly 4 includes the tested bolt 4.2, the tested One end of the bolt 4.2 is connected in the bolt fixing sleeve 7.7, and the end protruding from the bolt fixing sleeve 7.7 is connected with the tested nut 4.1, and a sliding plate 3 is arranged between the connecting plate 7.3 and the tested nut 4.1; the angle testing unit 5 includes Angle sensor 5.1, nut cover 5.2 and a plurality of magnetic blocks 5.4, the an...

Embodiment 2

[0049] Based on the testing device in Embodiment 1, this embodiment also provides a testing method, which includes the following steps: Obtaining the initial pre-tightening force of the tested bolt assembly 4 through the pressure sensor 7.4.

[0050] The power source drives the sliding plate 3 to move, and the sliding plate 3 slides to attenuate the pretightening force of the tested bolt assembly 4 .

[0051] During the attenuation process of the pretightening force of the tested bolt assembly 4, the angle sensor 5.1 obtains the rotation angle of the tested nut 4.1 through the change of the magnetic field of the magnetic block 5.4.

[0052] According to the rotation angle of the measured nut 4.1, the rotation pretightening force loss is calculated.

[0053] The pressure sensor 7.4 acquires the residual pretightening force of the tested bolt assembly 4; the non-rotating pretightening force loss is calculated according to the initial pretightening force, the rotational pretighte...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a bolt pretightening force attenuation testing device and method in a vibration process, and the device comprises a support, a bolt fixing and pretightening force testing unit, a tested bolt assembly, and an angle testing unit. The bolt fixing and pretightening force testing unit comprises a bolt fixing sleeve fixed on the support; a connecting plate is also fixed on the periphery of the bolt fixing sleeve; the tested bolt assembly comprises a tested bolt, one end of the tested bolt is connected in the bolt fixing sleeve, the end, extending out of the bolt fixing sleeve, of the tested bolt is connected with a tested nut, and a sliding plate is arranged between the connecting plate and the tested nut; the angle testing unit comprises an angle sensor, a nut sleeve and a magnetic block, the angle sensor is connected to the support, the nut sleeve sleeves the periphery of the tested nut, and the magnetic block is connected to the periphery of the nut sleeve; according to the invention, the rotation pretightening force loss and the non-rotation pretightening force loss can be accurately obtained, the structure is simple, and the realization is easy.

Description

technical field [0001] The invention relates to the technical field of bolt pretightening force detection, in particular to a bolt pretightening force attenuation testing device and testing method in a vibration process. Background technique [0002] Bolt connection is the main connection form of construction machinery. The attenuation of pre-tightening force leads to loosening and even fracture of bolts, which seriously affects the reliability of the connection of main machine products. The main factors of the attenuation factor of the bolt pretightening force are the attenuation of the pretightening force caused by the rotation of the nut and the plastic deformation and creep of the contact surface of the connected parts (non-rotation). The attenuation of pretightening force caused by nut rotation can be improved by adding nylon self-locking nuts, metal lock nuts, etc.; the attenuation of pretightening force caused by plastic deformation, creep, etc. (non-rotating) of the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01L5/24
CPCG01M13/00G01L5/24
Inventor 韩帅帅王灿丁鹏
Owner JIANGSU XCMG CONSTR MASCH RES INST LTD