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Mechanical stress measuring apparatus

A mechanical stress, measuring instrument technology, applied in the direction of force measurement by measuring the change of magnetic properties of materials caused by applied stress, can solve the problems of large resistance change rate and strain, significant semiconductor strain gauges, low test sensitivity, etc. The effect of easy manufacture and use, convenient and fast measurement work, and high measurement sensitivity

Inactive Publication Date: 2006-11-22
HUAIHAI INST OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

Resistance strain gauge is a common technology for measuring physical quantities such as strain, load, tension, and pressure at present, but there are also some shortcomings: the relationship between the resistance change rate and strain of conventional strain gauges in a large strain state is relatively nonlinear, and the semiconductor strain gauge more pronounced
The main disadvantage of this kind of torque sensor is that the structure is complex, the test sensitivity is relatively low, and it can only be used to measure torque. In the state of plane stress, it cannot be used to determine the direction of the principal stress and the measurement of the principal stress.

Method used

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  • Mechanical stress measuring apparatus
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Embodiment Construction

[0036] A mechanical stress measuring instrument includes a sensor 1, a sensor driving mechanism and a measurement circuit. The sensor 1 is provided with a sensor probe 14 and a probe fixing frame 15, and an insulating layer 16 is arranged between the probe 14 and the frame 15. The probe 14 There is an excitation magnetic pole 17 and two measurement magnetic poles 18, 19. The connection lines between the two measurement magnetic poles 18, 19 and the excitation magnetic pole 17 are perpendicular to each other and the distance is equal, and the excitation coil D is wound on the excitation magnetic pole 17. The measuring coils E are respectively wound on the measuring magnetic poles 18 and 19 1 and E 2 , the sensor drive mechanism is provided with a transmission box 10 driven by a stepping motor 9, and the output shaft 2 of the transmission box 10 is connected to the probe fixing frame 15,

[0037] The measurement circuit includes a sensor induction signal processing circuit and ...

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Abstract

The disclosed mechanical stress measuring device comprises: a sensor with an exciting electrode with coil D and two measuring electrodes with coils (E1, E2) connected by vertical equal-distance wires, a sensor driver arranged both a gear box driven by a step motor to connect the a probe frame by its output shaft and a control circuit with a displacement / angle sensor to send measured signal into a main computer, and a measuring circuit. This invention has high sensitivity for both static and dynamic measurement with simple structure.

Description

technical field [0001] The invention relates to a stress measuring device, in particular to a mechanical stress measuring instrument for measuring the stress of mechanical components made of ferromagnetic materials. Background technique [0002] In mechanical engineering, stress is a very important physical quantity. The accurate measurement of these physical quantities is of great significance to ensure the safe operation of equipment, realize automatic control, and provide designers with a reasonable design calculation basis. The strain measuring instruments similar to the present invention are mainly: resistance strain gages and piezomagnetic torque sensors. The working principle of a resistance strain gauge is based on its strain effect. When using the strain gauge to measure the stress or strain of the component, the resistance strain gauge is pasted on the surface of the measured component, and the strain gauge and the parts are deformed together. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/12
Inventor 石延平
Owner HUAIHAI INST OF TECH
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