Bolt tightening force coefficient measuring method

A measurement method and technology of tightening force, applied in the direction of measuring devices, testing of mechanical components, testing of machine/structural components, etc., can solve the problems of large dispersion of K value, many factors affecting K value, and difficult to handle properly. To achieve the effect of preventing bolt overload and ensuring tightness

Active Publication Date: 2013-10-02
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The data of K is very important in the design calculation and construction technology of connecting bolts. Germany, the United States, and Japan pay more attention to the research in this area, but they also feel that it is difficult to handle it properly because of the large dispersion of K values ​​in the actual measurement.
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  • Bolt tightening force coefficient measuring method
  • Bolt tightening force coefficient measuring method
  • Bolt tightening force coefficient measuring method

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Step 1: Calibrate the pressure sensor, apply a force P of 0~180KN to the pressure sensor through the tensile test machine pressure fixture 0 , and record the voltage U of the force sensor 7 under different forces through the software of the tensile testing machine, the data of the force and voltage obtained are shown in Table 1, and the force-voltage curve is drawn as attached image 3As shown, according to the formula (1), the pressure-voltage relationship is obtained.

[0060] U=kF+b (1)

[0061] U——the voltage displayed by the pressure sensor, in V;

[0062] F——the force exerted by the tensile testing machine, in N;

[0063] k—coefficient, unit V / N;

[0064] b——the initial voltage displayed by the pressure sensor when the force is 0, in V.

[0065] The pressure-voltage relationship in this embodiment is: U=0.028 P0+0.0254.

[0066] Table 1 Pressure and sensor voltage detected during calibration of tensile testing machine

[0067]

[0068] Step 2: As attached...

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Abstract

The invention relates to a bolt tightening force coefficient measuring method, and especially is suitable for tightening force coefficient measuring of an iron tower galvanizing bolt. The method comprises the following steps: demarcating a pressure transducer, connecting an iron tower bolt tightening force coefficient simulation testing device, installing the simulation testing device in a tensile testing machine, acquiring pre-tightening force data, and calculating a tightening force coefficient. The method can be realized in a laboratory; the operation is easy; the test result is accurate; and the guiding significance is provided to the iron tower integral structure and stability assessment.

Description

technical field [0001] The invention relates to a method for measuring the coefficient of tightening force of bolts, in particular to the measurement of the coefficient of tightening force applicable to iron tower galvanized bolts. Background technique [0002] The structure and pre-tightening force of the bolt have a great influence on the reliability and fatigue life of the tower joint. Under the conditions allowed by the bolts and the interlayer of the iron tower, the greater the pre-tightening force, the safer and more reliable the connection, and the longer the fatigue life. However, excessive pre-tightening force may cause damage to bolts and interlayers, so accurate control of pre-tightening force becomes one of the key measures to improve joint reliability and fatigue life. Important screwed joints require strict control of the pre-tightening force. In the assembly process, it is very difficult to directly measure the pre-tightening force. Generally, the tightening ...

Claims

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Application Information

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IPC IPC(8): G01M13/00
Inventor 柯浩冯砚厅徐雪霞孙澎
Owner STATE GRID CORP OF CHINA
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