Detection system and control method for bolts and their pretightening force

A technology of bolt pretightening force and control method, which is applied to measure the direction of torque/torsion force during tightening, which can solve the problems of large error range and inability to realize precise control of bolt pretightening force, so as to improve safety and avoid control errors Effect

Active Publication Date: 2015-09-30
ZOOMLION HEAVY IND CO LTD
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  • Description
  • Claims
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Problems solved by technology

However, using this torque method requires a large number of experiments before assembly to determine the value of the anti-torsion coefficient K, and the friction between the bolt and the connected parts is different due to the different lubrication conditions, even for the same batch of the same size For bolts, the error range of the value of the torsion coefficient K is also large, so that the precise control of the pretightening force of the bolts cannot be realized, which can easily lead to safety accidents.

Method used

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  • Detection system and control method for bolts and their pretightening force
  • Detection system and control method for bolts and their pretightening force
  • Detection system and control method for bolts and their pretightening force

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Embodiment Construction

[0022] In order to make the purpose of the present invention, technical scheme and technical effect clearer, below in conjunction with appendix Figure 1~3 Embodiments of the present invention are further described in detail.

[0023] figure 1 It is the flow chart of the first embodiment of the control method of the bolt pretightening force in the present invention, which is in figure 2 The description will be made on the basis of the detection system 100 for bolt pretightening force shown, wherein the detection system 100 includes a strain gauge 110 , a measuring device 120 and a wire 130 for electrically connecting the strain gauge 110 and the measuring device 120 . refer to figure 1 and figure 2 As shown, the control method of the bolt pretightening force of the present embodiment comprises:

[0024] Step S11: Paste strain gauges on the outer surface of the polished rod section of the bolt.

[0025] The detection system 100 for the bolt pretightening force is used to...

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Abstract

The invention provides a bolt and a detection system and control method for pretightening force of the bolt. The control method comprises the steps that a strain gage is pasted on the outer surface of a polish rod section of the bolt; a first through hole is formed in a bolt head; a guide wire penetrates through the first through hole to enable the strain gage and a measurement mechanism to be electrically connected; the bolt is pre-tightened to enable the measurement mechanism to obtain the axial strain epsilon of the strain gage, and the pretightening force F of the bolt is controlled according to the relation expression of the axial strain epsilon and the pretightening force F to achieve mounting. Through the mode, the bolt, the detection system and the control method can precisely control the pretightening force of the bolt, and the connecting safety of the bolt can be improved.

Description

technical field [0001] The invention relates to the technical field of mechanical connections, in particular to a detection system and control method for bolts and their pretightening force. Background technique [0002] The connection with bolts as connecting parts is the most common detachable connection, and the preload is an important performance index that needs to be measured during the tightening process of bolts. Appropriate pre-tightening force can improve the reliability of the bolted connection and the fatigue strength of the bolt, and it can improve the airtightness of the connection with tightness requirements. However, excessive pre-tightening force will lead to overload of the bolts and connected parts, which can easily lead to safety accidents. Therefore, it is necessary to strictly control the pre-tightening force of the bolts during assembly. [0003] In the prior art, the pretightening force is generally controlled by the torque method, which is based on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/24
Inventor 张保山汪志凯刘民邓玲孙泽海
Owner ZOOMLION HEAVY IND CO LTD
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