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Bolt tightening torque coefficient measuring device

A technology of tightening torque and measuring device, which is used to measure torque/torsional force during tightening, which can solve the problems of high cost of sensors and unsuitable short bolts, and achieve the effect of strong operability, low cost, and simple and reliable measurement method.

Inactive Publication Date: 2016-05-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the sensor volume, only larger bolts can be measured, which is not suitable for short bolts
In addition, the cost of the sensor is relatively high

Method used

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  • Bolt tightening torque coefficient measuring device
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  • Bolt tightening torque coefficient measuring device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Implementation example: take the measurement of the tightening torque coefficient of the M10 bolt of GH4169 material as an example to describe the specific implementation steps in detail.

[0035] Refer to attached figure 1 , the specific steps of applying the present invention to measure the bolt tightening torque coefficient are:

[0036] Step 1: Select the main body 4, and install the measuring screw 5 with the strain gauge attached into the main body 4. During the loading process, care should be taken to avoid damage to the strain gauge 9 and the connecting wires.

[0037] Step 2: Select the first sleeve 6 with M10 bolt holes, install the M10 test bolt 1 into the first sleeve 6 through the bolt holes, and install the bolts into the body 4 through the M10 bolt holes on the outer frame, Screw on the nut 2 to prevent the test bolt 1 from falling out.

[0038] Step 3: Connect the first sleeve 6 with the measuring screw 5 through threaded connection, then select the la...

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Abstract

The invention provides a bolt tightening torque coefficient measuring device. The bolt tightening torque coefficient measuring device includes a main body, a first sleeve, a second sleeve, a screw, a bolt to be measured, a nut, a stop screw, foil gauges and a torque spanner, wherein the internal of the main body is a hollow cavity; the hollow cavity sleeves the first sleeve coaxially; the main body is in clearance fit with the first sleeve; threaded holes are formed axially in both the main body and the first sleeve; one end of the bolt to be measured penetrates through the threaded holes in the main body and the first sleeve, and then is in threaded connection with the nut; the screw is in threaded connection with the first sleeve; the foil gauges are uniformly arranged on the screw in the circumferential direction; one end of the screw is connected with the bolt to be measured, and pre-tightens and fixes the bolt to be measured through the stop screw; and the other end of the screw is connected with an adjusting screw nut. The bolt tightening torque coefficient measuring device provides a simple and reliable measuring method for determination of a bolt tightening torque coefficient for engineering practice, and has guiding function for applying suitable pre-tightening force to the bolt.

Description

technical field [0001] The invention relates to the technical field of bolt testing, and the key point is the measurement of the tightening torque coefficient in the threaded connection pre-tightening process. Background technique [0002] Bolt connection has the advantages of good connection rigidity, light weight, simple structure, and convenient assembly and disassembly. It is the most common connection method in mechanical structures. It needs to apply a certain pre-tightening force during assembly to enhance the rigidity of the connection. , Tightness and anti-loosening ability to prevent gaps or slippage between connected parts after loading. Excessive pre-tightening force will lead to a decrease in the bearing capacity of the structure, and the connecting bolts will yield, loosen, and delay fracture under the load; loose so that the structure cannot function properly. Therefore, it is necessary to apply an appropriate axial preload to the bolts during assembly. At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/24
CPCG01L5/24
Inventor 于庆民周红磊杨向锦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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