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A test method for force-measuring bolt and axial force

A test method and technology of axial force, which is applied to measure torque/torsional force and other directions during tightening, can solve the problems that the strain temperature change cannot be compensated, the moisture-proof seal cannot be realized, and the wires are easy to be spliced, etc. It achieves convenient calibration and sensitive response , calculate the simple effect of

Active Publication Date: 2020-05-22
TIANJIN AEROSPACE RELIA TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the axial pretightening force of the bolts can be directly obtained through this technology, the wires are easily spliced ​​because the wires pass through the through holes, which affects the assembly, and the strain cannot be compensated with temperature changes, and the function of sealing and moisture-proof cannot be realized at the same time.

Method used

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  • A test method for force-measuring bolt and axial force
  • A test method for force-measuring bolt and axial force
  • A test method for force-measuring bolt and axial force

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described,

[0032] Such as Figure 1 to Figure 5 As shown, the present invention provides a force-measuring bolt. The bolt 2 includes a bolt head 2a and a screw rod 2b. An inner hole 2d is set on the bolt head 2a and extends toward the screw rod 2b. A core body 1 is fixed in the inner hole of the bolt. The core body 1 is pasted with a strain gauge 3 , one end of the core body 1 is fixed in the bolt rod 2 b , and the other end is fixed in the bolt head 2 a , and the strain gauge 3 is connected to the strain test unit 6 through the strain test line 4 .

[0033] One end of the core 1 is provided with a core thread 1d, and a corresponding bolt internal thread 2e is provided at an inner position of the screw 2b, and the core 1 and the screw 2b are screwed and fixed.

[0034] The other end of the core 1 is provided with a core installation surface 1e, and a core inst...

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Abstract

The present invention belongs to the mechanical connection technology field, and concretely relates to a force measurement bolt and an axial force test method. The force measurement bolt is provided, the bolt (2) comprises a bolt head (2a) and a screw (2b), and the bolt head (2a) is provided with an inner bore and is extended to the screw (2b) portion. A core (1) is fixed in the bolt (2), a strain gage (3) is pasted on the core (1), one end of the core (1) is fixed in the screw (2b), the other end of the core (1) is fixed in the bolt head (2a), the bolt is fastened to generate strain force, and the strain gage (3) is connected with a strain test unit (6) through a strain test wire (4). The force measurement bolt and the axial force test method are provided, the core pasted by the strain gage is installed in the bolt hole, and the core and a main body bolt are closely fixed so as to directly obtain a strain value through the strain gage on the core and measure the axial force value of the bolt.

Description

technical field [0001] The invention belongs to the technical field of mechanical connection, and in particular relates to a force-measuring bolt and a testing method for its axial force. Background technique [0002] Bolted connection structures are widely used in mechanical systems and are one of the most common connection forms. Under the action of pre-tightening force, the axial tension of the bolt gives the contact surface a friction force to achieve the purpose of joint fastening. With the wide application of mechanical automation technology, the requirements for the reliability of bolted connections are getting higher and higher. For sensitive parts of important products, there are extremely strict regulations on the pretightening force of bolted connections. For example, the fastening quality of important bolts such as the cylinder head, connecting rod, main bearing cap, flywheel and crankshaft pulley in the engine directly affects the power, safety and reliability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/24
CPCG01L5/24
Inventor 严鲁涛杨志鹏邱杰王晓森
Owner TIANJIN AEROSPACE RELIA TECH
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