CN108917997B - Adapting unit stress detecting system suitable for narrow and small space - Google Patents
Adapting unit stress detecting system suitable for narrow and small space Download PDFInfo
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- CN108917997B CN108917997B CN201810842442.9A CN201810842442A CN108917997B CN 108917997 B CN108917997 B CN 108917997B CN 201810842442 A CN201810842442 A CN 201810842442A CN 108917997 B CN108917997 B CN 108917997B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
- G01L1/2281—Arrangements for correcting or for compensating unwanted effects for temperature variations
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention discloses a stress detection system of a connecting part suitable for a narrow space, which structurally comprises a stress measurement mechanism; the stress monitoring mechanism and the connecting structure; when the mechanical connecting part is stressed, the mechanical connecting part is deformed, because the two ends of the deformation measuring part are fixed in the effective stress range of the mechanical connecting part, the deformation measuring part is deformed in proportion to the mechanical connecting part, the deformation of the deformation measuring part can be converted into an electric signal form for transmission, the stress condition of the mechanical connecting part can be obtained through the comprehensive action of the integrated data input/output port, the signal converter and the calibration recording part according to the calculation of a relevant equation, and the stress condition is displayed on the terminal processing controller to complete the stress monitoring function; the device has the advantages of reasonable system design, low cost, convenient operation, accurate signal and easy reading.
Description
Technical Field
The invention relates to the field of stress detection, in particular to a stress detection system for a connecting part, which is suitable for a narrow space.
Background
In engineering and scientific research projects, stress monitoring of connecting parts is an important index for guaranteeing the operation safety of a system. In engineering, stress monitoring of a connection member is generally achieved by measuring the deformation of the connection member. Commonly used measuring devices are: strain gauge, high accuracy imager. For the strain gauge, the required measurement space is generally larger than 5mm, and a measurement and control line is required, and meanwhile, for the high-temperature measurement, a plurality of temperature measurement elements and corresponding measurement and control lines are required to be additionally arranged so as to correct the final calculation result. The high-precision imager analyzes the image of the deformation part of the connecting part and further determines the deformation of the connecting part. In practical situations, for equipment sealing bolts, pipeline flange connecting bolts and the like, the space is often narrow, and methods such as adding equipment outside the connecting part or analyzing images are not suitable for monitoring stress of the connecting part with narrow space.
Disclosure of Invention
The invention provides a stress detection system of a connecting part suitable for a narrow space aiming at the current situation that the monitoring is difficult, and the stress detection system of the connecting part combines the connecting part and a sensor and can be widely applied to the stress monitoring of various radial and axial connecting parts such as bolts, threaded connection and the like.
There is a lot of prior art on stress monitoring of connection parts:
for example, patent CN103335588A provides a method for measuring deformation of a casing of a high-voltage closed container device, and particularly relates to a method for measuring deformation of a casing of a high-voltage closed container device, which is used in the field of deformation measurement of casings of closed container electrical devices such as power capacitors and oil-immersed transformers: the strain gauge bridge converts the deformation of the capacitor shell into analog signal resistance incremental values delta Ra and delta Rb, the analog signal resistance incremental values are output to the microcontroller through the conditioning circuit, the microcontroller samples input signals and calculates measured values of the deformation, the microcontroller collects temperature values of the temperature sensor, calculates temperature compensation values of the deformation of the capacitor shell and finally calculates the deformation values, the casing deformation values of the high-pressure closed container equipment are accurately obtained, and linearity calibration and zero calibration of the deformation measuring tool under a standard test environment are calculated. The method is suitable for measuring the deformation of the equipment shell for the electrical equipment, and the monitoring result is a deformation value which is essentially different from the stress value of the monitored object. Meanwhile, the invention adopts a built-in structure, and the invention adopts an external monitoring layout, and the two are fundamentally different in structure and detection result. The invention is not suitable for stress detection of compact mechanical connection components.
For another example, CN101206148A is a method for accurately measuring high temperature stress-strain, in which a calibrated high temperature strain gauge is used to measure a component on site in a high temperature environment, so as to obtain the stress condition of the component. The method only measures a single point, and cannot be applied to the overall measurement of the set target of the part. This patent has adopted the measurement of multiple spot temperature field to whole measurement, has solved the drawback of the measuring range of this patent. Simultaneously this patent adopts built-in detection structure, adopts bar-shaped or cubic deformation measuring equipment, and it is narrow and small to have satisfied the space that should, is not suitable for under the occasion of arranging the foil gage, the demand of stress detection.
As also described in the article "A method For On-Line calibration Of Temperature And mechanical Stress For Machine Components And Structures", the article provides a solution For verifying the overall Stress Of a Machine. The whole idea is to calibrate mechanical equipment and parts in advance and then calculate an online measurement result. When the method is used for stress monitoring of particularly important equipment, the logic calculation is very useful, but the cost is high. In the aspect of logic calculation, a fitting function scheme is adopted in the calculation scheme, the interpolation method of the article is not adopted for calculation, and a certain amount of measurement accuracy is improved theoretically. In the measurement scheme, a plurality of detection points are required to be arranged in the method of the article, the structure is complex, and the method is difficult to be suitable for the integral monitoring of a large system.
For another example, patent CN201410850516 provides a stress distribution monitoring device and method, the monitoring device is mainly composed of piezoelectric fibers, a dynamic signal amplifier, a charge amplifier, a signal hold circuit, a multi-way analog switch, an a/D converter and a microprocessor, the monitoring method is to cross-distribute a plurality of piezoelectric fibers on a structural component to be detected, sense piezoelectric information generated by the stress deformation of the structural component, and determine the stress distribution of the structural component through information processing of the cross fibers. The monitoring method can analyze the stress distribution of machinery and other structural components in real time, and has important significance for avoiding the fracture of the structure due to overlarge stress. The patent mainly adopts a multi-piezoelectric fiber detection method. The invention has larger limitation on the monitoring of large deformation quantity, and is not suitable for mechanical connection conditions such as soft sealing and the like. Meanwhile, the structure is designed in a plane, so that the stress monitoring device is not suitable for stress monitoring of irregular mechanical connecting parts in narrow spaces. The invention adopts the deformation measuring part with a built-in rod-shaped or block-shaped structure, thereby solving the problem of the invention.
The invention aims to overcome the defects of the prior art and provides a stress detection system for a connecting part, which is suitable for a narrow space. The invention can be divided into: a stress measuring mechanism; stress monitoring mechanism and connection structure. Stress detection of the mechanical connecting part is completed by adding the stress monitoring part and the stress monitoring equipment. The invention can be widely applied to stress monitoring of important mechanical connecting parts.
The invention can be divided into: a stress measuring mechanism; stress monitoring mechanism and connection structure. Wherein stress measurement mechanism includes: a mechanical connecting member; a deformation measuring member; a temperature feedback device; an insulating member; a signal power supply mechanical connection component; the recording means is calibrated.
The mechanical connecting part completes the connecting action between the parts. The deformation measuring component is arranged in the mechanical connecting component and is arranged along the stress direction of the mechanical connecting component, the deformation measuring component is made of selenium-tellurium alloy, and the material characteristic of the deformation measuring component is that once slight deformation occurs, the resistance of the deformation measuring component is enabled to change greatly. The deformation measuring component comprises a signal interface and a digital-to-analog conversion interface, and the measuring result can be converted into the stress value of the mechanical connecting component through measuring the resistance value of the deformation component and the temperature feedback result of the temperature feedback device. The insulating part mainly completes the electrical insulation among the deformation measuring part, the temperature feedback device and the mechanical connecting part and isolates related interference signals. The signal power supply mechanical connecting part is composed of a multi-jack aviation plug and corresponding leads, and the signal wires and the power supply wires of the deformation measuring part, the temperature feedback device and the calibration recording part are connected with corresponding wires of the stress monitoring mechanism. The calibration recording part records important information such as the calibration result, the serial number, the calibration date and the like of the stress measuring mechanism, and the corresponding information is connected with the stress monitoring mechanism through the signal power supply mechanical connecting part, so that the functions of uploading the information and updating the corresponding information can be completed.
The stress monitoring mechanism mainly comprises: the device comprises a display, a power supply, a signal acquisition \ sending board, a data recording module and a logic calculation module. The display displays the information related to stress monitoring, such as the measured stress magnitude, the calibration value and the like. The power supply provides power needed by the stress measurement component and the temperature feedback device, has a signal isolation function, isolates signal influence of different power utilization units, and can provide stable voltage and current according to the requirements of the power utilization units. The signal acquisition \ sending board collects feedback information of the deformation component, the temperature feedback device and the calibration recording component and transmits the feedback information to the logic calculation module and the data recording module. And the logic calculation module calculates to obtain a stress value according to the obtained resistance signal and the component temperature and transmits the stress value to the data recording module. The data recording module records important parameters such as stress values, measuring time and the like, and feeds back corresponding results to a calibration recording part of the stress measuring mechanism so as to complete a data updating function. The above data transmission modes can be performed by wireless transmission. The invention has simple basic structure, is based on metal characteristics, can be applied to the harsh environment condition after being calibrated, and completes the stress monitoring of the mechanical connecting part in an online/offline state. The stress monitoring device has wide application prospect, and can be widely applied to mechanical connecting parts with stress monitoring requirements in the fields of nuclear power, wind power, thermal power, chemical industry, petroleum and the like. The system has reasonable design, low cost and convenient operation.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
the invention completes the measurement of the deformation quantity of the mechanical connecting part through the deformation measuring part of the mechanical connecting part;
the stress measuring mechanism records important information such as a calibration result, a serial number, a calibration date and the like of the stress measuring mechanism through the calibration recording part, and completes the functions of uploading information and updating corresponding information;
according to the invention, a stress value of a mechanical connecting part is obtained through calculation by a logic calculation module according to the obtained resistance signal and the part temperature, and is transmitted to a data recording module;
the mode that the measuring structure is arranged in the fastener in the invention solves the problem that an external measuring part occupies space, realizes a stress detection system of the connecting part suitable for narrow space, and realizes the on-line/off-line stress monitoring function of the mechanical connecting part; in a word, the system can be widely applied to the stress monitoring system of the mechanical connecting part with the stress monitoring requirement in the fields of nuclear power, wind power, thermal power, chemical industry, petroleum and the like. The device has reasonable system design, lower cost and convenient operation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic view of a stress monitoring system suitable for use with a mechanically coupled component;
in fig. 1, 1-mechanical connecting part connecting head end, 2-mechanical connecting part connecting tail end, 3-insulating part, 4-deformation measuring part connecting end, 5-temperature feedback device, 6-integrated data input and output port, 7-signal converter, 8-mechanical connecting part, 9-deformation measuring part, 10-calibration recording part, 11-terminal processing controller.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Referring to fig. 1, a plurality of 5-temperature feedback devices are arranged at two ends 1 and 2 of a 9 deformation measuring component and are connected to 6 integrated data input and output ports, an insulating component is arranged at the outer side of the 5-temperature feedback devices and 3 plays a role in electrical insulation, signal influence isolation and connection, and the 9 deformation measuring component is fixed on an 8-mechanical connecting component through a connecting mode such as threads. At the moment, the deformation quantity of the 9 deformation measurement component and the deformation quantity of the 8 mechanical connecting component have a direct proportion relation. And 6, transmitting the deformation quantity of the 9 deformation measuring component to a 7-signal converter through an integrated data input/output port in an electric signal mode, and simultaneously transmitting a 5-temperature feedback device new signal to the 7-signal converter through the 6-integrated data input/output port. And 7, converting the signals and the calibration data in the 10-calibration recording component into stress results of the connecting component by the signal converter, transmitting the stress results to an 11-terminal controller, displaying the stress results on the terminal controller, and transmitting the calibration results to the 10-calibration recording component. The connecting part stress calculation equation is as follows:
F＝fT(T)×La/Lx×fx()
wherein: f. ofT(T) is the stress temperature coefficient of influence (in units of 1) of the mechanical connection, which is dependent only on the material of the mechanical connection; l isaIs the effective stressed length of the mechanical connecting part; l isxIs the effective stress length, f, of the deformation measuring memberx() Is a function of the force value of the deformation measuring part with respect to the deformation signal.
Use example 1: calibration procedure
After the mechanical connecting part is installed and the deformation measuring part is finished, the calibration work is needed to be carried out independently. The calibration process is that the tester obtains the stress temperature influence coefficient f of the mechanical connecting part after applying different stresses at different temperatures in sequenceT(T) function and transferring the function to the 10 calibration recording unit through the terminal controller. And finishing the calibration work.
Use example 2: monitoring process
When the mechanical connecting part is stressed, the mechanical connecting part deforms, because two ends of the deformation measuring part are fixed in the effective stress range of the mechanical connecting part, the deformation measuring part deforms in proportion to the mechanical connecting part, the deformation of the deformation measuring part can be converted into an electric signal to be transmitted, the stress condition of the mechanical connecting part can be obtained through the comprehensive action of the 6, 7 and 10 parts and calculation according to a correlation equation, and the stress condition is displayed on the terminal processing controller to complete the stress monitoring function.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A system for detecting stress of a connecting part applied to a narrow space is characterized by comprising:
the stress measuring mechanism, the stress monitoring mechanism and the connecting structure are arranged on the base; wherein, stress measurement mechanism includes: the device comprises a mechanical connecting part, a deformation measuring part, a temperature feedback device, an insulating part, a signal power supply mechanical connecting part and a calibration recording part; the mechanical connecting part completes the connection between the parts, and the deformation measuring part is arranged in the mechanical connecting part and arranged along the stress direction of the mechanical connecting part; the deformation measuring component converts the measuring result into the stress value of the mechanical connecting component by measuring the resistance value of the deformation component and the temperature feedback result of the temperature feedback device; the insulating part is used for completing the electrical insulation among the deformation measuring part, the temperature feedback device and the mechanical connecting part and isolating related interference signals; the signal power supply mechanical connecting part is used for connecting signal wires and power supply wires of the deformation measuring part, the temperature feedback device and the calibration recording part with corresponding wires of the stress monitoring mechanism; the calibration recording component is used for recording relevant information of the stress measuring mechanism;
the stress monitoring mechanism includes: the device comprises a display, a power supply, a signal acquisition/transmission board, a data recording module and a logic calculation module; the display is used for displaying stress monitoring related information; the power supply provides power needed by the stress measurement component and the temperature feedback device; the signal acquisition/transmission board is used for collecting feedback information of the deformation measurement component, the temperature feedback device and the calibration recording component and transmitting the feedback information to the logic calculation module and the data recording module; the logic calculation module obtains a stress value through calculation according to the obtained resistance signal and the component temperature, and transmits the stress value to the data recording module; the data recording module records related parameters and feeds back corresponding results to a calibration recording part of the stress measuring mechanism so as to complete a data updating function;
F＝fT(T)×La/Lx×fx()
wherein: f. ofT(T) is a mechanical linkThe stress temperature coefficient of influence of the component, which is dependent on the material of the mechanical connection component; l isaIs the effective stressed length of the mechanical connecting part; l isxIs the effective stress length, f, of the deformation measuring memberx() Is a function of the force value of the deformation measuring part with respect to the deformation signal.
2. The system for detecting stress of a connecting member used in a small space according to claim 1, wherein the deformation measuring member is made of selenium-tellurium alloy.
3. The system for detecting stress of a connecting part applied to a small space according to claim 1, wherein the deformation measuring part comprises a signal interface and a digital-to-analog conversion interface.
4. The system for detecting stress of a connecting part applied to a narrow space according to claim 1, wherein the signal-powered mechanical connecting part comprises: a multi-outlet aviation plug and corresponding leads.
5. The system for detecting stress of a connecting member applied to a narrow space according to claim 1, wherein the calibration recording means records the calibration result, the serial number, and the calibration date information of the stress measuring means.
6. The system for detecting stress of a connecting part in a small space as claimed in claim 1, wherein the power supply has a signal isolation function for isolating signal influence of different power consumption units.
7. The system for testing stress of a connecting member used in a small space according to claim 1, wherein the display displays the measured stress level and the calibration value.
8. The system for detecting stress of a connecting part applied to a narrow space according to claim 1, wherein the data recording module records stress values and measurement time parameters.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002236064A (en) * | 2001-02-07 | 2002-08-23 | Akebono Brake Ind Co Ltd | Bolt with strain sensor, and strain sensor |
| GB2450449B (en) * | 2006-03-10 | 2011-05-25 | Nat Inst Of Advanced Ind Scien | Stress history recording system |
| KR101455875B1 (en) * | 2006-09-20 | 2014-11-03 | 코닝 인코포레이티드 | Temperature compensation for shape-induced inplane stresses in glass substrates |
| EP2131169A1 (en) * | 2008-06-05 | 2009-12-09 | Ecole Polytechnique | Strain sensor with high gauge factor |
| CN103162877B (en) * | 2011-12-15 | 2015-09-23 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of method checking bolt load |
| WO2016015092A1 (en) * | 2014-07-30 | 2016-02-04 | Integrity Engineering Solutions Pty Ltd | Fasteners |
| CN204421830U (en) * | 2015-03-09 | 2015-06-24 | 山东捷宏环保科技有限公司 | A kind of oil cylinder of filter press soldered stress deformation pick-up unit |
| CN105574341B (en) * | 2015-12-17 | 2018-04-17 | 西安交通大学 | A kind of bolt room temperature pretightning force computational methods to work under worst cold case |
| CN106773185B (en) * | 2017-02-06 | 2024-05-03 | 东旭（昆山）显示材料有限公司 | Gap adjusting device, roller gap adjusting method and roller deformation detecting method |
| CN207095770U (en) * | 2017-08-01 | 2018-03-13 | 明阳智慧能源集团股份公司 | A kind of hydraulic elongator device for testing tensile force |
| CN108180839A (en) * | 2017-12-28 | 2018-06-19 | 浙江华安激光科技有限公司 | A kind of displacement sensor and detection device for small space detection |
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