CN107505178A - Grid silk preparation method, grid silk, structural member fatigue fracture monitoring device, system - Google Patents
Grid silk preparation method, grid silk, structural member fatigue fracture monitoring device, system Download PDFInfo
- Publication number
- CN107505178A CN107505178A CN201710674270.4A CN201710674270A CN107505178A CN 107505178 A CN107505178 A CN 107505178A CN 201710674270 A CN201710674270 A CN 201710674270A CN 107505178 A CN107505178 A CN 107505178A
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- Prior art keywords
- grid
- silk
- structural member
- grid silk
- monitoring device
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of grid silk preparation method, grid silk, structural member fatigue fracture monitoring device, system, this method includes：Grid groove pattern is etched in substrate surface；Inert metal grind into powder is obtained into metal powder；The metal powder is dissolved to after obtaining mixed solution in volatile solvent, the mixed solution is injected in the grid groove；The grid silk in the grid groove is obtained after volatile solvent volatilization.Remove metal material unnecessary outside the grid groove.Volatile solvent is alcohol or gasoline.Inert metal is silver.Grid groove is etched into S types, square wave type or sawtooth pattern.Technical scheme provided by the invention, parts crack conditions that can be in equipment running process on real-time watch device, and accuracy of identification is higher, when there is fatigue fracture in structural member, can Realtime Alerts, reduce due to there is structural member fatigue fracture and caused accident.
Description
Technical field
The present invention relates to mining machinery field, more particularly to a kind of preparation method of structural member fatigue fracture monitoring device,
Structural member fatigue fracture monitoring device and system.
Background technology
Among the damage failure of mechanical structure, fatigue failure is one of chief destructive pattern.Because material is inevitable
Microdefect or microfissure be present in ground, in the presence of the factors such as fatigue load, environmental corrosion, microdefect and microfissure
It can gradually extend, and ultimately result in structural member failure, or even can cause a serious accident.In order to ensure device structure safely and reliably
Work, it is necessary to be monitored in real time to large scale equipment, the running status of important feature, structural damage, failure etc..At present, commonly use
Structural member fatigue fracture monitoring method include non-destructive monitoring method, vibration analysis detection method, still, non-destructive monitoring method needs costliness
Special equipment, and majority could be detected in the case of shutdown, poor real, for the system that runs at high speed and
Sudden crack fault is difficult to；Because the vibration component of complex mechanical system is complicated, antijamming capability is poor, vibration analysis
Detection method is huge in processing complex mechanical system hour operation quantity, and accuracy of identification is poor.Meanwhile large-scale engineering machinery field is much set
Standby structural member also has no idea to monitor equipment in real time in equipment running process by space limits.
The content of the invention
In view of this, be badly in need of a kind of small volume in practical application, can be on real-time watch device in equipment running process
Parts crack conditions, and accuracy of identification it is higher structural member fatigue fracture monitoring technical scheme.The embodiment of the present invention
A kind of preparation method of structural member fatigue fracture monitoring device is provided, methods described includes：
Grid groove pattern is etched in substrate surface；
Inert metal grind into powder is obtained into metal powder；
The metal powder is dissolved to after obtaining mixed solution in volatile solvent, the mixed solution is injected into the grid
In groove；
The grid silk in the grid groove is obtained after volatile solvent volatilization.
Preferably, obtain also comprising the following steps in the grid silk in the grid groove after volatile solvent volatilization：
Remove metal material unnecessary outside the grid groove.
Preferably, the volatile solvent is alcohol or gasoline.
Preferably, the inert metal is silver.
Preferably, the grid groove is etched into S types, square wave type or sawtooth pattern.
Present invention also offers a kind of grid silk, the grid silk is made of any one above-mentioned grid silk preparation method.
The embodiment of the present invention additionally provides a kind of structural member fatigue fracture monitoring device, and described device includes using above-mentioned
Anticipate grid silk made of a kind of grid silk preparation method, in addition to：
Substrate, form be embedded in the grid silk shape identical grid groove, the grid silk in the grid groove thereon；
First lead and the second lead, it is connected and extends on the outside of the substrate with the both ends of the grid silk respectively；
Insulating trip, it is arranged on the substrate.
Preferably, the grid groove is provided at both ends with the first contact and the second contact；One end of the grid silk and described the
One contact portion, the other end and second contact portion；One end of first lead and first contact portion, it is described
One end of second lead and second contact portion.
Preferably, one end of the grid silk, one end of first lead are welded admittedly with first contact by solder
It is fixed；The other end of the grid silk, one end and second contact of second lead are welded and fixed by solder.
The embodiment of the present invention additionally provides a kind of structural member fatigue fracture monitoring system, and the system includes：
Power supply, contactor, alarm module and any one above-mentioned structural member fatigue fracture monitoring device, the power supply and institute
Monitoring device, the contactor and the alarm module is stated to connect to form loop；Wherein：
The monitoring device is pasted on the measured surface of monitored structural member, and the grid silk in the monitoring device is in the quilt
Survey surface is broken when cracked；
The contactor closes when the grid silk is broken；
The alarm module sends alarm when the contactor closes.
Grid silk preparation method provided in an embodiment of the present invention, grid silk, structural member fatigue fracture monitoring device, system, can
Parts crack conditions in equipment running process on real-time watch device, and accuracy of identification is higher, occurs in structural member
During fatigue fracture, can Realtime Alerts, reduce due to there is structural member fatigue fracture and caused accident.
Brief description of the drawings
Fig. 1 is the flow chart for the grid silk preparation method that the embodiment of the present invention one provides；
Fig. 2 is the structural representation for the structural member fatigue fracture monitoring device that the embodiment of the present invention two provides；
Fig. 3 is the structural representation for the structural member fatigue fracture monitoring device that the embodiment of the present invention three provides；
Fig. 4 a are the schematic diagram of the warning circuit for the structural member fatigue fracture monitoring system that the embodiment of the present invention four provides；
Fig. 4 b are the schematic diagram of the application method for the structural member fatigue fracture monitoring system that the embodiment of the present invention four provides.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, hereinafter with reference to attached in the embodiment of the present invention
Figure, technical scheme is clearly and completely described by embodiment, it is clear that described embodiment is the present invention one
Section Example, rather than whole embodiments.
Embodiment one
As shown in figure 1, present embodiments provide a kind of preparation method of structural member fatigue fracture monitoring device.
101st, grid groove pattern is etched in substrate surface.
Go out grid groove pattern in substrate surface laser-induced thermal etching.Wherein, the cross-sectional area of grid groove is 0.3 to 1 square millimeter,
In practical application, the cross-sectional area of grid groove can also take other appropriate values according to being actually needed；The shape of grid groove can be S types,
Square wave type or sawtooth pattern etc..
102nd, inert metal grind into powder is obtained into metal powder.
In general inert metal has preferable plasticity and ductility in itself, but after being ground into metal powder, then weigh
Newly condensing together, its plasticity and ductility will be deteriorated, when monitored structural part fractures, the grid silk made of metal powder
Also it can therewith be broken, therefore structural member surface can be real-time monitored and be broken.
The inert metal selected in the present embodiment is silver.Silver powder under high circulation stress easily will not fatigue fracture,
Therefore it is highly suitable as the material of fatigue fracture monitoring device.In actual applications, other inert metal materials can also be used
Instead of ag material, such as golden material.
103rd, metal powder is dissolved in volatile solvent and obtains mixed liquor, by mixed liquor injection grid groove.
Metal powder is dissolved in volatile solvent (such as alcohol or gasoline etc.), then injected mixed liquor on substrate
In the grid groove etched.
104th, the grid silk in grid groove is obtained after volatile solvent volatilization.
105th, metal material unnecessary outside the grid groove is removed.
This step is optional step, can also be clear by metal material unnecessary outside grid groove after volatile solvent volatilization
Reason is clean.
Embodiment two
Present embodiments provide a kind of structural member fatigue fracture monitoring device.
As shown in Fig. 2 the structural member fatigue fracture monitoring device that the present embodiment provides includes：Substrate 1, grid silk 2, insulating trip
3rd, the first lead 41, the second lead 42.Grid groove 11 is formed on substrate 1；Grid silk 2 have with the identical shape of grid groove 11, inlay
In grid groove 11；Insulating trip 3 is arranged on the upper strata of substrate 1, and is transparent insulation piece；One end of first lead 41 and grid silk 2
Connection, the second lead 42 is connected with the other end of grid silk 2, and the first lead 41 and the second lead 42 all extend to the outside of substrate 1.
The cross-sectional area of grid groove 11 can be S types, square wave type or sawtooth pattern between 0.3 to 1 square millimeter.Grid silk 2 and grid groove 11
Size is adapted, and is embedded in grid groove 11.
Embodiment three
Present embodiments provide a kind of structural member fatigue fracture monitoring device.
As shown in figure 3, the structural member fatigue fracture monitoring device that the present embodiment provides includes：Substrate 1, grid silk 2, insulating trip
3rd, the first lead 41, the second lead 42, the first contact 51, the second contact 52.Grid groove 11 is formed on substrate 1；Grid silk 2 have with
The identical shape of grid groove 11, is embedded in grid groove 11；Insulating trip 3 is arranged on the upper strata of substrate 1；Touch the first contact 51 and second
The both ends that point 52 is respectively arranged at grid groove 11, the one end of one end of the first lead 41 with grid silk 2 at the first contact 51 pass through weldering
Material is welded and fixed, and the other end of one end of the second lead 42 with grid silk 2 at the second contact 52 is welded and fixed by solder, and first
The lead 42 of lead 41 and second all extends to the outside of substrate 1.
Example IV
A kind of structural member fatigue fracture monitoring system is present embodiments provided, the system includes any in embodiment two, three
A kind of structural member fatigue fracture monitoring device, power supply, contactor and alarm module.
In the present embodiment, structural member fatigue fracture monitoring system includes structural member fatigue fracture monitoring device, power supply, connect
Tentaculum and alarm module.As shown in fig. 4 a, structural member fatigue fracture monitoring device D, power supply U, contactor C and alarm module A strings
Connection forms warning circuit W, and contactor C is normally open.Structural member fatigue fracture monitoring device D is pasted on monitored structural member
The easy cracked position in surface.As shown in Figure 4 b, the arrangement of structural member fatigue fracture monitoring device D grid silk 2 moves towards a
The propagation direction b of crackle with being likely to occur is vertical, when the position of monitored structural member is cracked, makees caused by crackle
Structural member fatigue fracture monitoring device D substrate is firmly caused to deform upon, while substrate produces stress to grid silk 2, as long as grid
Silk 2 has to be disconnected at one, and the coil of contactor, which will lose magnetism, is changed into closure state so that warning circuit turns on, alarm module
Send sound and light alarm signal.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (10)
1. a kind of grid silk preparation method, it is characterised in that methods described includes：
Grid groove pattern is etched in substrate surface；
Inert metal grind into powder is obtained into metal powder；
The metal powder is dissolved to after obtaining mixed solution in volatile solvent, the mixed solution is injected into the grid groove
In；
The grid silk in the grid groove is obtained after volatile solvent volatilization.
2. grid silk preparation method according to claim 1, it is characterised in that obtain institute after volatile solvent volatilization
State and also comprise the following steps in the grid silk in grid groove：
Remove metal material unnecessary outside the grid groove.
3. grid silk preparation method according to claim 1, it is characterised in that the volatile solvent is alcohol or vapour
Oil.
4. grid silk preparation method according to claim 1, it is characterised in that the inert metal is silver.
5. grid silk preparation method as claimed in any of claims 1 to 4, it is characterised in that the grid groove is etched
For S types, square wave type or sawtooth pattern.
A kind of 6. grid silk that grid silk preparation method using described in claim 1-5 any one is prepared.
7. a kind of structural member fatigue fracture monitoring device, it is characterised in that described device includes grid as claimed in claim 6
Silk, in addition to：
Substrate, form be embedded in the grid silk shape identical grid groove, the grid silk in the grid groove thereon；
First lead and the second lead, it is connected and extends on the outside of the substrate with the both ends of the grid silk respectively；
Insulating trip, it is arranged on the substrate.
8. structural member fatigue fracture monitoring device according to claim 7, it is characterised in that
The grid groove is provided at both ends with the first contact and the second contact；
One end of the grid silk and first contact portion, the other end and second contact portion；
One end of first lead and first contact portion, one end of second lead connect with second contact
Connect.
9. structural member fatigue fracture monitoring device according to claim 6, it is characterised in that
One end of the grid silk, one end and first contact of first lead are welded and fixed by solder；The grid silk
The other end, one end and second contact of second lead be welded and fixed by solder.
10. a kind of structural member fatigue fracture monitoring system, it is characterised in that including power supply, contactor, alarm module and such as right
It is required that the structural member fatigue fracture monitoring device any one of 7-9, the power supply and the monitoring device, the contactor
Connect to form loop with the alarm module；Wherein：
The monitoring device is pasted on the measured surface of monitored structural member, and the grid silk in the monitoring device is in the tested table
It is broken when face is cracked；
The contactor closes when the grid silk is broken；
The alarm module sends alarm when the contactor closes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710674270.4A CN107505178A (en) | 2017-08-09 | 2017-08-09 | Grid silk preparation method, grid silk, structural member fatigue fracture monitoring device, system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710674270.4A CN107505178A (en) | 2017-08-09 | 2017-08-09 | Grid silk preparation method, grid silk, structural member fatigue fracture monitoring device, system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107505178A true CN107505178A (en) | 2017-12-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710674270.4A Pending CN107505178A (en) | 2017-08-09 | 2017-08-09 | Grid silk preparation method, grid silk, structural member fatigue fracture monitoring device, system |
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| CN (1) | CN107505178A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666308A (en) * | 2020-12-16 | 2021-04-16 | 神华北电胜利能源有限公司 | Monitoring equipment and monitoring method for monitoring spontaneous combustion of coal on coal bench |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4546652A (en) * | 1981-12-22 | 1985-10-15 | Materials Research, Inc. | In-situ on-line structural failure detection system, its preparation and operation |
| JPS61240152A (en) * | 1985-04-17 | 1986-10-25 | Toyota Motor Corp | Method for inspecting crack |
| CN201194125Y (en) * | 2008-03-25 | 2009-02-11 | 东莞市长安镇厦岗小学 | Bridge breaking alarm device |
| US20100225497A1 (en) * | 2006-01-26 | 2010-09-09 | National Research Council Of Canada | Surface-Mounted Crack Detection |
| CN101852058A (en) * | 2009-03-31 | 2010-10-06 | 徐克林 | Alarming steel wire grid |
| CN203772787U (en) * | 2014-02-07 | 2014-08-13 | 武汉理工大学 | Real-time metal structure crack monitoring device |
| CN204389297U (en) * | 2014-12-15 | 2015-06-10 | 中国飞机强度研究所 | A kind of test specimen initial crack monitoring device |
| CN105444661A (en) * | 2015-12-25 | 2016-03-30 | 陕西电器研究所 | Metal sputtering thin film technology-based ablation sensor |
| CN105518531A (en) * | 2013-09-04 | 2016-04-20 | 伊斯曼柯达公司 | Method of forming conductive films with micro-wires |
| CN105745574A (en) * | 2013-12-03 | 2016-07-06 | 伊斯曼柯达公司 | Preparation of articles with conductive micro-wire pattern |
| CN106290012A (en) * | 2016-09-06 | 2017-01-04 | 四川大学 | I mode-Ⅲ crack dynamic arrest toughness method of testing under a kind of shock loading |
-
2017
- 2017-08-09 CN CN201710674270.4A patent/CN107505178A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4546652A (en) * | 1981-12-22 | 1985-10-15 | Materials Research, Inc. | In-situ on-line structural failure detection system, its preparation and operation |
| JPS61240152A (en) * | 1985-04-17 | 1986-10-25 | Toyota Motor Corp | Method for inspecting crack |
| US20100225497A1 (en) * | 2006-01-26 | 2010-09-09 | National Research Council Of Canada | Surface-Mounted Crack Detection |
| CN201194125Y (en) * | 2008-03-25 | 2009-02-11 | 东莞市长安镇厦岗小学 | Bridge breaking alarm device |
| CN101852058A (en) * | 2009-03-31 | 2010-10-06 | 徐克林 | Alarming steel wire grid |
| CN105518531A (en) * | 2013-09-04 | 2016-04-20 | 伊斯曼柯达公司 | Method of forming conductive films with micro-wires |
| CN105745574A (en) * | 2013-12-03 | 2016-07-06 | 伊斯曼柯达公司 | Preparation of articles with conductive micro-wire pattern |
| CN203772787U (en) * | 2014-02-07 | 2014-08-13 | 武汉理工大学 | Real-time metal structure crack monitoring device |
| CN204389297U (en) * | 2014-12-15 | 2015-06-10 | 中国飞机强度研究所 | A kind of test specimen initial crack monitoring device |
| CN105444661A (en) * | 2015-12-25 | 2016-03-30 | 陕西电器研究所 | Metal sputtering thin film technology-based ablation sensor |
| CN106290012A (en) * | 2016-09-06 | 2017-01-04 | 四川大学 | I mode-Ⅲ crack dynamic arrest toughness method of testing under a kind of shock loading |
Non-Patent Citations (1)
| Title |
|---|
| 张振亚: "脆性材料中动态裂纹传播问题的研究", 《中国博士学位论文全文数据库 基础科学辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666308A (en) * | 2020-12-16 | 2021-04-16 | 神华北电胜利能源有限公司 | Monitoring equipment and monitoring method for monitoring spontaneous combustion of coal on coal bench |
| CN112666308B (en) * | 2020-12-16 | 2022-11-08 | 神华北电胜利能源有限公司 | Monitoring device and monitoring method for monitoring spontaneous combustion of coal on coal bench |
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