CN2551983Y - Portable stress distribution detector - Google Patents
Portable stress distribution detector Download PDFInfo
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- CN2551983Y CN2551983Y CN 02238026 CN02238026U CN2551983Y CN 2551983 Y CN2551983 Y CN 2551983Y CN 02238026 CN02238026 CN 02238026 CN 02238026 U CN02238026 U CN 02238026U CN 2551983 Y CN2551983 Y CN 2551983Y
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Abstract
The utility model relates to a portable stress distribution detector relating to a device using magnetic detecting method to hold stress detecting for a component. The detector mainly comprises a magnetic probe formed by two magnetic resistance components with same magnetic sensing direction, which are positioned on different height and vertically corresponding, an amplifying circuit, a comb-shaped filtrating wave, an A/D switching module, a SCM, a PDA palm computer, a magnetic resistance component/reposition circuit, and a software processing program and a PDA program stored in the SCM in advance. The detector has no need to compensate the temperature influence and adjust zero, thereby being very convenient for using. The utility model has no need to hold special excitation for a detected magnetic object and do any pretreatment for an detected surface, and the allowable deviating value reaches more than 200mm. The utility model has rapid detecting speed and can visually display the stress distribution condition inside the work piece and indicate the strain centralized position.
Description
Technical field
The utility model relates to a kind of component stress measurement mechanism, relates in particular to a kind of magnetic detection method that utilizes member is carried out the instrument that stress detects.
The stress distribution detector that detects.
Background technology
Stress is concentrated the mechanical property to member, corrosion resistance, and fatigue strength, form accuracy etc. all can cause significant impact.The distribution of research component inside stress determines that the size of internal stress becomes the problem of extensive concern in the applied research.
Whether the method for testing that stress is concentrated has destructiveness according to it for tested member, can be divided into diminishing method of testing and non-destructive testing method two big classes.The blind hole method is the exemplary process that destructive stress detects, and its shortcoming is the detection method complexity, and tested member is had in various degree destructiveness.The nondestructive stress measurement method of testing has x rays method, supersonic testing method, magnetic detection method, photoelastic detection method etc.
Magnetic detection method is to utilize the magnetic characteristic of ferromagnetic material under stress influence to change to carry out the stress detection.Usually the magnetic detection method that adopts relies on the external magnetic field excitation, also brought thus magnetize inhomogeneous, equipment is heavy, energy resource consumption, can't detect complicated problems such as structure, remanent magnetism and electromagnetic pollution.
China's utility model patent (ZL00242001.5) discloses a kind of metal magnetic memory diagnostic instrument, and the patented product is made up of magnetic induction sensor array, temperature sensor, distance-measuring device, amplification filtering circuit, multi-way switch, A/D modular converter, cpu system, display device.Its sensor array is that series connection output is formed by an input in parallel of the hall device to tens same models.This utility model is mainly used in the position of determining that ferromagnetic parts exists defective or stress to concentrate.Owing to adopt hall device as surveying Magnetic Sensor, determined that this instrument detecting precision is lower, the subtle change of low-intensity magnetic field can not be found, thereby the subtle change of stress can not be found; Hall device must return to zero before the each use of instrument, has increased the complicacy of testing process; The temperature drift characteristic of hall device makes must increase temperature-compensation circuit on the circuit structure of instrument, to improve the input and output linearity degree of instrument.
The utility model content
The purpose of this utility model is at the deficiencies in the prior art and defective, and a kind of portable stress distribution detector is provided, and this portable stress distribution detector need not to add excitation, does not need temperature effect is compensated, and does not need zeroing, and simple to operate.
Technical solution of the present utility model is as follows:
The portable stress distribution detector that the utility model provides mainly comprises the magnetic probe of being made up of two magnetosensitive sense direction magnetoresistance devices identical, that be placed in differing heights and vertical correspondence, amplifying circuit, comb filtering and A/D modular converter, single-chip microcomputer, the PDA palm PC, magnetoresistance device is put/reset circuit, is stored in software processes program and PDA program in the single-chip microcomputer in advance; The output terminal of described two magnetoresistance devices links to each other with the input end of comb filtering with the A/D modular converter through amplifying circuit respectively, comb filtering is connected with the input end of single-chip microcomputer with A/D modular converter output terminal, and the output terminal of single-chip microcomputer puts with magnetoresistance device respectively/and reset circuit, PDA palm PC and comb filtering link to each other with the A/D modular converter; Described magnetoresistance device puts/and the output terminal of reset circuit links to each other with the input end of two magnetoresistance devices respectively.
The utility model course of work is as follows:
Adopt two magnetoresistance devices to form magnetic probe as Magnetic Sensor, signal after the measurement is respectively through after amplifying, and through 50Hz power frequency and various frequency multiplication thereof are disturbed have the comb filtering and A/D module processing of high rejection ratio after, input to single-chip microcomputer, single-chip microcomputer is imported the PDA palm PC by the RS232 serial communication with signal, palm PC handle to detect data and on LCD video data, receive outside input operation by function button again.Single-chip microcomputer is controlled the data-switching of A/D modular converter and putting/resetting of collection and magnetoresistance device simultaneously.
The utility model does not in use need temperature effect is compensated owing to adopt said structure, does not need zeroing, uses very simple; Do not need to do any pre-service to the special excitation of detected ferromagnetism object with to measured surface, allow lift-off value to reach more than the 200mm, detection speed is fast and can intuitively show and the stress distribution situation of workpiece inside indicate the position that stress is concentrated.
Adopt two magnetoresistance devices to form VG (vertical gradient) meter probe, when the measuring workpieces curved surface, can effectively remove the influence of terrestrial magnetic field, further improved the accuracy of testing result and the reliability of instrument.
Owing to adopted and put/reset circuit, before each the measurement, magnetoresistance device is put/resetted, can effectively improve the detection sensitivity and the linearity of magnetoresistance device; Employing is disturbed the comb filtering circuit with high rejection ratio to 50Hz power frequency and various frequency multiplication thereof, reduced the environment electromagnetics interference effectively, make detector survey magnetic sensitivity and reach 27 μ Gauss, can be used as the microgasuss and count use, is the favourable additional and raising of making the teslameter of survey Magnetic Sensor with hall device.
The utility model has rechargeable battery, can provide 8 hours continuously and work the required energy, has RS232 interface and PC and can realize serial communication, the detection data in the portable instrument is imported in the PC further handled, and generate and detect report file.Instrument adopts functions such as man-machine conversation, menu prompt, hot key help, multiple Threshold Alerts, explosive area data readback, and can store, analyze data, has the Chinese and English software version.
Description of drawings
Fig. 1 is the utility model theory structure block diagram.
Fig. 2 is the utility model magnetic probe structural representation.
Fig. 3 a, 3b are the utility model embodiment Single Chip Microcomputer (SCM) program FB(flow block).
Fig. 4 is the PDA program flow chart of the utility model embodiment.
Fig. 5 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing:
Fig. 1 is a general structure block diagram of the present utility model.It mainly comprises 7, two amplifying circuits 8 of VG (vertical gradient) meter magnetic probe of being made up of two magnetic group devices 6, and comb filtering and A/D modular converter 10, single-chip microcomputer 11, PDA palm PC 13 and magnetic resistance are put/reset circuit 12 compositions.The output terminal of described two magnetoresistance devices links to each other with the input end of comb filtering with the A/D modular converter through amplifying circuit respectively, the output terminal of comb filtering and A/D modular converter is connected with single-chip microcomputer, single-chip microcomputer links to each other with the PDA palm PC by serial communication circuit, described magnetoresistance device puts/and the input end of reset circuit links to each other with single-chip microcomputer, and its output terminal links to each other with two magnetoresistance devices respectively; Single-chip microcomputer is also controlled the data-switching and the collection of A/D modular converter simultaneously.Above-mentioned magnetoresistance device 6 adopts HMC1001, and pectination trap and A/D modular converter adopt the CS5509 chip, and described single-chip microcomputer adopts AT89C2051, and described magnetoresistance device puts/and reset circuit is made up of IRF7105 and voltage transformation chip MAX662A.
The survey magnetic signal of two magnetoresistance devices 6 is through behind amplification, filtering and the A/D modular converter 10, be transferred as after and carry out differential processing to single-chip microcomputer 11, arrive PDA palm PC 15, just obtain eliminating the measured workpiece Surface field intensity behind the earth magnetic effect, this magnetic field intensity can reflect workpiece internal stress distribution situation more accurately.
Fig. 2 is the structural representation of VG (vertical gradient) meter magnetic probe 7.Form by two magnetoresistance devices 6 that vertically are encapsulated in the detection faces 14 differing heights planes, and two magnetoresistance device magnetosensitive sense directions are identical.
Fig. 3 is the Single Chip Microcomputer (SCM) program block diagram of the utility model embodiment.Single Chip Microcomputer (SCM) program is made up of master routine a and interruption subroutine b.
Master routine a: the mode that is provided with interruption among the master routine a, at first each control register of initialization and P1 port after program begins, time-delay finishes to guarantee to demarcate, open then the interruption, to sensor reset, delay time guarantee that A/D conversion, sampling finish after, the set sensor, putting the R7 register value simultaneously is 02H, data by reading in by interruption subroutine in the serial ports transmitter register at last, check the numerical value in the R7 register, be 0H if this is worth, then again sensor resetted, carry out the next round cycling; Otherwise, continue to check the numerical value in the R7 register.
Interruption subroutine b: after the beginning, corresponding CS5509 sheet transforms to finish and sends interrupt request singal, changes over to and interrupts sub-journey.At first gating send interrupt request CS5509 serial ports and with its chip selection signal zero clearing, another sheet CS5509 chip selection signal is put 1, and interruption subroutine reads in the data that CS5509 has transformed by displacement mode then, is kept among the RAM, numerical value in the R7 register is subtracted 1, interrupt returning.
Magneto sensor I is made of the magnetoresistance device HMC1001 or the HMC1021 one dimension magnetic-sensitive elements of Honeywell company.
Signal processing circuit II is made up of amplification and low-pass filtering chip AMP04, comb filtering and A/D conversion chip CS5509.R1 and R2 regulate the enlargement factor of two AMP04 respectively; Y1, C3, C4 and Y2, C5, C6 can realize that for CS5509 provides the clock of 32.768KHz frequency output speed is the serial communication of 20 word/seconds, and CS5509 provides 16 A/D conversion, is exported by the 15th pin serial.Magneto sensor I constitutes twin-channel magnetic probe by two magnetoresistance devices among the figure, and corresponding signal processing circuit II is made of identical two parts.
Control module III is made up of single chip computer AT 89C2051 and MAX232E.The P1.6 mouth line of AT89C2051 provides the original reset signal of putting of magnetoresistive element, and P1.4 mouth line and P3.4 mouth line are used for receiving two signals after the passage A/D conversion respectively, and P3.0 mouth line and P3.1 mouth line are used for serial communication.
Magnetoresistance device is put reset circuit IV and is made up of power amplification chip I RF7105 and voltage transformation chip MAX662A.MAX662A and capacitor C 15, C16 become the 12V DC voltage with the 5V supply voltage, to satisfy the power requirement of IRF7105.IRF7105 and peripheral circuit can provide that 4A's put the reset pulse electric current to magnetoresistive element.
Power Management Unit V is made up of TPS76350 and capacitor C 21, C20, outside 6V supply voltage can be converted to the required 5V operating voltage of system.
Claims (2)
1. portable stress distribution detector, it is characterized in that: this detector mainly comprises the magnetic probe of being made up of two magnetosensitive sense direction magnetoresistance devices identical, that be placed in differing heights and vertical correspondence, amplifying circuit, comb filtering and A/D modular converter, single-chip microcomputer, PDA palm PC, magnetoresistance device are put/reset circuit, are stored in software processes program and PDA program in the single-chip microcomputer in advance; The output terminal of described two magnetoresistance devices links to each other with the input end of comb filtering with the A/D modular converter through amplifying circuit respectively, comb filtering is connected with the input end of single-chip microcomputer with A/D modular converter output terminal, and the output terminal of single-chip microcomputer puts with magnetoresistance device respectively/and reset circuit, PDA palm PC and comb filtering link to each other with the A/D modular converter; Described magnetoresistance device puts/and the output terminal of reset circuit links to each other with the input end of two magnetoresistance devices respectively.
2. according to the described portable stress distribution detector of claim 1, it is characterized in that: described magnetoresistance device adopts HMC1001, described pectination trap and A/D modular converter adopt the CS5509 chip, described single-chip microcomputer adopts AT89C2051, and described magnetoresistance device puts/and reset circuit is made up of IRF7105 and voltage transformation chip MAX662A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02238026 CN2551983Y (en) | 2002-06-28 | 2002-06-28 | Portable stress distribution detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02238026 CN2551983Y (en) | 2002-06-28 | 2002-06-28 | Portable stress distribution detector |
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| CN2551983Y true CN2551983Y (en) | 2003-05-21 |
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| CN 02238026 Expired - Fee Related CN2551983Y (en) | 2002-06-28 | 2002-06-28 | Portable stress distribution detector |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397059C (en) * | 2006-06-20 | 2008-06-25 | 淮海工学院 | Mechanical stress measuring apparatus |
| CN102879457A (en) * | 2012-07-20 | 2013-01-16 | 北京工业大学 | Three-dimensional metal magnetic memory testing instrument and method |
| CN104614689A (en) * | 2015-01-22 | 2015-05-13 | 北京航空航天大学 | Giant magneto-impedance effect-based magnetic field gradient sensor |
| CN109186818A (en) * | 2018-07-23 | 2019-01-11 | 天津大学 | A kind of non-contact, non-intrusion type pressure measurement method for pressure vessel |
| CN111323008A (en) * | 2020-03-05 | 2020-06-23 | 北京航空航天大学 | Micromechanical gyroscope POS geomagnetic measurement circuit |
| CN111610250A (en) * | 2020-07-06 | 2020-09-01 | 中石油西北联合管道有限责任公司 | Intelligent residual magnetism detection test device |
-
2002
- 2002-06-28 CN CN 02238026 patent/CN2551983Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397059C (en) * | 2006-06-20 | 2008-06-25 | 淮海工学院 | Mechanical stress measuring apparatus |
| CN102879457A (en) * | 2012-07-20 | 2013-01-16 | 北京工业大学 | Three-dimensional metal magnetic memory testing instrument and method |
| CN102879457B (en) * | 2012-07-20 | 2016-05-18 | 北京工业大学 | 3-dimensional metal magnetic memory detector device and detection method |
| CN104614689A (en) * | 2015-01-22 | 2015-05-13 | 北京航空航天大学 | Giant magneto-impedance effect-based magnetic field gradient sensor |
| CN109186818A (en) * | 2018-07-23 | 2019-01-11 | 天津大学 | A kind of non-contact, non-intrusion type pressure measurement method for pressure vessel |
| CN109186818B (en) * | 2018-07-23 | 2020-11-27 | 天津大学 | Non-contact non-invasive pressure measurement method for pressure container |
| CN111323008A (en) * | 2020-03-05 | 2020-06-23 | 北京航空航天大学 | Micromechanical gyroscope POS geomagnetic measurement circuit |
| CN111610250A (en) * | 2020-07-06 | 2020-09-01 | 中石油西北联合管道有限责任公司 | Intelligent residual magnetism detection test device |
| CN111610250B (en) * | 2020-07-06 | 2023-09-05 | 管网集团(新疆)联合管道有限责任公司 | Intelligent residual magnetism detection test device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030521 Termination date: 20100628 |