Axially-stressed pre-tightening bolt connection strength experiment table and experiment method thereof

A technology of connecting strength and pre-tightening bolts is applied in the field of teaching experimental benches, which can solve the problems of difficult installation of strain gauges, inaccurate experimental results, and unfavorable replacement of the tested piece, etc., so as to facilitate experimental analysis, ensure accuracy, Guarantee the effect of experimental detection accuracy

Pending Publication Date: 2022-01-25
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing bolt test bench uses resistance strain gauges to measure stress and strain, and needs to be equipped with an additional A / D conversion and signal amplification test system. The equipment debugging is complicated, the detection parameters are not comprehensive, the data error is large, the experimental results are not accurate enough, and the experimental requirements for clear theoretical verification cannot be met.

Method used

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  • Axially-stressed pre-tightening bolt connection strength experiment table and experiment method thereof
  • Axially-stressed pre-tightening bolt connection strength experiment table and experiment method thereof
  • Axially-stressed pre-tightening bolt connection strength experiment table and experiment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] This embodiment relates to a test bench in static load loading mode. Such as Figure 1 to Figure 8 As shown, the experimental bench includes an experimental bolt connection structure 2 and a loading device 3 arranged on a base 1, wherein the detection elements used include force sensors and deformation displacement detectors, and the displacement detectors use dial gauges. A storage table 4 can also be arranged on the base 1 for placing a display, and the display is connected to the force sensor through the control unit. The specific connection position of the dial indicator is as follows: Image 6 shown.

[0077] Such as image 3 As shown, the experimental bolted connection structure 2 includes a sensor A 21, a lower steel plate 22, a connected piece 23, an upper steel plate 24, and a sensor B 25 arranged sequentially from bottom to top. The lower steel plate 22, the connected piece 23, and the upper steel plate 24 There are center holes through the core and the ce...

Embodiment 2

[0097] This embodiment relates to a test bench in a dynamic load loading mode. Such as Figure 9 to Figure 16 As shown, the loading lever and transmission unit of the loading device in this embodiment are different from those in Embodiment 1, and the other structures are the same as in Embodiment 1.

[0098] In this embodiment, the loading lever of the test bench includes a lever bracket 311, a pin shaft 316 arranged on the lever bracket 311, and two lever arms 310 with symmetrical structures at both ends of the pin shaft 316, and the lever arm 310 adopts a rigid beam as a whole. , the right end of the lever arm 310 is fixedly connected with an L-shaped pressing plate 315 . Specifically, the upper end of the vertical plate of the pressing plate 315 is a beam, and the beam is integrally formed with the L-shaped pressing plate 315 , and the two ends of the beam are respectively fixed to the right ends of the two lever arms 310 . Such as Figure 10 to Figure 12 shown.

[0099...

Embodiment 3

[0110]This embodiment relates to a test bench in a dynamic load loading mode. Such as Figure 17 As shown, the difference from Embodiment 2 is that the left lever arm 312 of the loading lever adopts a rigid beam structure with a vertical section, and the right lever arm 313 adopts an elastic beam structure with a certain extension length. The elastic beam is flat and has a cross-section It is rectangular, and the elastic beam is made of elastic material. The right end of the elastic beam is directly connected with the lower end of the sensor C. The experimental bolt connection structure 2, the transmission unit 32, and the sensor C 33 are all the same as those in the second embodiment.

[0111] That is to say, in this embodiment, the structure of the loading lever is the same as that in Embodiment 1.

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Abstract

The invention discloses an axially-stressed pre-tightening bolt connection strength experiment table and an experiment method thereof. The experiment table and the experiment method are used for stress and deformation detection and strength analysis of axially-stressed pre-tightening bolts. The experiment table comprises a bolt connecting structure and a loading device. The connecting structure is sequentially provided with a sensor A, a lower steel plate, a connected piece, an upper steel plate and a sensor B from bottom to top, and an experiment bolt penetrates through the lower portion of the base and is pre-tightened. A linear bearing structure is adopted for connecting and positioning, so that the influence of friction force and additional bending moment on bolt stress is reduced, and the loading precision of pure axial load is improved. The loading device comprises a lever with an elastic structure, a transmission unit and a sensor C, and manual loading of static load is realized through screw transmission, the motor drives an eccentric cam to rotate to realize continuous dynamic loading, and the deformation amount of an elastic piece is controlled through the eccentric amount of the cam to ensure the variable load loading precision. The experiment table connecting pieces can be flexibly interchanged, and the experiment table is suitable for engineering cognition experiments in the field of mechanical part strength and bolt fatigue strength testing experiments in the engineering field.

Description

technical field [0001] The invention belongs to the technical field of teaching experiment benches, and in particular relates to an axially stressed pretightening bolt connection strength experiment bench and an experiment method thereof. Background technique [0002] As a widely used fastener, bolts are required to have high connection strength and reliability. The analysis of the bolt connection strength, that is, the study of the factors affecting the bolt strength and the measures to improve the bolt strength, is of great significance to improve the reliability of the bolt connection. Among them, the tight bolt connection that bears the preload and working tension is the most common and the most important form of force. In the practical teaching of the "Mechanical Design" series of engineering courses in colleges and universities, the force analysis principle and fatigue strength calculation method considering deformation are universal, and they are typical analysis exa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01B5/30G01L5/00
CPCG01M13/00G01L5/0028G01B5/30
Inventor 张莉洁马福贵张松豪张慧贤贾贵西李晓雷田丽萍
Owner LUOYANG INST OF SCI & TECH
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