CN104407045B - The device and method of seizure bridge cable fracture of wire based on metal magnetic memory technique - Google Patents
The device and method of seizure bridge cable fracture of wire based on metal magnetic memory technique Download PDFInfo
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Abstract
A kind of device of the seizure bridge cable fracture of wire based on metal magnetic memory technique, including drag-line to be monitored；Its innovation is：Described device is made up of support, the pipe that is rigidly connected, three-dimensional Magnetic Memory probe and Centralized Controller；The support is arranged on drag-line；Centralized Controller is arranged on support；Multiple three-dimensional Magnetic Memory probes are arranged on drag-line, and three-dimensional Magnetic Memory probe is located at bracket outer, is connected between three-dimensional Magnetic Memory probe and support by the pipe that is rigidly connected, three-dimensional Magnetic Memory probe and the pipe one-to-one corresponding that is rigidly connected；Multiple three-dimensional Magnetic Memory probes are electrically connected by multiple conducting wires and Centralized Controller respectively, and the wire, which is placed in, to be rigidly connected in pipe.The invention also provides the method for the seizure bridge cable fracture of wire based on aforementioned means.The method have the benefit that：Bridge fracture of wire situation can be monitored, after fracture of wire problem is found, alert process is made in time, it is ensured that bridge operation safety.
Description
Technical field
The present invention relates to a kind of bridge cable fracture of wire monitoring technology, more particularly to a kind of catching based on metal magnetic memory technique
Catch the device and method of bridge cable fracture of wire.
Background technology
Intensity is high, it is small to conduct oneself with dignity due to possessing for drag-line（Relatively）The characteristics of, and be widely used among bridge structure, it is big
The important component of bridge beam, the performance state of drag-line directly decides the service life of bridge.Many bridges in-service at present
Beam, its drag-line is directly exposed in air mostly, after the drag-line in high-stress state is corroded by extreme natural environment for a long time,
Its sealer exists after breakage, protection damage layer unavoidably, and the steel wire inside drag-line can also be corroded by various diseases therewith,
Cause drag-line drag to be degenerated, in turn result in drag-line durability and be greatly lowered, shorten the actual life of drag-line；
In multiple diseases, what is be particularly acute is fracture of wire disease, due to the loading characteristic of stayed structure, after drag-line local fracture of wire, will be made
Steel wire stress is all redistributed in into rope, then fracture of wire disease is further deteriorated to vicious circle, when fracture of wire degree reaches
It will be broken when to a certain degree, cause serious accident and huge economic losses；Therefore, how timely and accurately to find
Drag-line fracture of wire disease simultaneously formulates corresponding handle measure, for ensureing that bridge operation security implications are great.
At present, for the main acoustic emission method of routine monitoring method, ray method and the guided wave method of drag-line fracture of wire；
Acoustic-emission（AE）When being and defect is produced under stress condition using material strain energy is discharged in elastic wave form
Phenomenon realize component defect inspection, it can realize the dynamic monitoring to drag-line fracture of wire generating process；But this method is gone back at present
Practical application can not be put into, because drag-line is formed by many steel wire kinks, is rocked in stress or drag-line under effect, many steel wires
Between exist friction, by friction caused by acoustical signal acoustic-emission can be interfered, how to interference signal and useful signal
Separated, be the technical barrier that need be solved in the technology.
Ray method is that using rays such as X, Y during object is penetrated, decay different phenomenons because of object material difference
To realize component inside defects detection.When ray method is applied to drag-line and monitored, the interior of drag-line cable body and anchorage zone can be monitored
Portion's defect, but because detection efficiency is low, image analysis is difficult, and cost is high, the problem of especially in the presence of radiation pollution, is not obtaining
During further progress, large-scale application is not appropriate in the monitoring of modern bridge cable.
The principle of guided wave method is, according to magnetostrictive effect or piezo-electric effect, to be excited in component along drag-line Propagation
Elastic wave, when the elastic wave runs into defect, can produce reflection echo, reflection echo is detected element and received, you can obtain defect
Information, realizes that drag-line fracture of wire is monitored.But, it is relatively low to there is precision in guided wave method, the problems such as circumferentially positioned difficult.
The content of the invention
The problem of in background technology, the present invention proposes a kind of seizure bridge cable based on metal magnetic memory technique
The device of fracture of wire, including drag-line to be monitored；Its innovation is：Described device is by support, many pipes that are rigidly connected, multiple three-dimensionals
Magnetic Memory is popped one's head in and Centralized Controller composition；The support is arranged on drag-line；Centralized Controller is arranged on support；Multiple three
Dimension Magnetic Memory probe is arranged on drag-line, and three-dimensional Magnetic Memory probe is located at bracket outer, between three-dimensional Magnetic Memory probe and support
By being rigidly connected, pipe is connected, three-dimensional Magnetic Memory probe and the pipe one-to-one corresponding that is rigidly connected；Multiple three-dimensional Magnetic Memory probe difference
It is electrically connected by multiple conducting wires and Centralized Controller, the wire, which is placed in, to be rigidly connected in pipe.
The present invention principle be：Metal magnetic memory technique is to develop rapidly in the world in later stage 1990s
Non-destructive testing technology, its general principle is：Ferrimagnet is under geomagnetic excitation, and magnetic can occur for stress concentration and deformed region
Flex effect and magnetic domain tissue orientation are caused, and produces irreversible reorientation, the magnetic signal detected can be sent out in damage location
Raw mutation；Metal magnetic memory detection technology was born so far from 1997, and " component gross imperfection can be found, again because its is exclusive
Can find stress concentrate caused by microscopic damage " advantage and develop rapidly, sum up, metal magnetic memory detection technology master
Feature is wanted to have the following aspects：1st, microdefect is can detect that, and can forecast that the future of defect is dangerous, this is the technology
Great advantage；2nd, Magnetic Memory method does not need externally-applied magnetic field, just with the own magnetic field of accumulated damage component, by having magnetic by oneself
Field and magnetic field of the earth interaction, the area of stress concentration on detected object surface generates stray field, by analyzing stray field magnetic
The change of signal and graded may determine that damage zone；3rd, be not required to be detected workpiece surface cleared up, polish or
Other pretreatments, can substantially reduce labor intensity and time；4th, detection data redundancy and good reliability；In view of metal magnetic memory
The aforementioned advantages of technology, current metal magnetic memory technique has been successfully applied to undercarriage, turbo blade, oil-gas pipeline etc.
The damage check of load-carrying construction part, but bridge monitoring field is also not directed to.Then inventor is considered metal magnetic memory technique
Applied to bridge monitoring field, drag-line fracture of wire problem is monitored accordingly；In order that metal magnetic memory technique can be applied to
Drag-line fracture of wire is monitored, and inventor has carried out lot of experiments and exploration, and finally proposes the solution of the present invention, specifically, this
Scheme of the invention is realized in its purpose：Support is the supporting structure for connecting monitoring device and drag-line, and the present invention passes through support
Monitoring device is firmly mounted on drag-line；The pipe that is rigidly connected plays connecting bracket and three-dimensional Magnetic Memory probe, except this
Outside, three-dimensional Magnetic Memory probe also relies on the supporting role for the pipe that is rigidly connected to be close on drag-line, and is rigidly connected pipe also
Protective effect is served to being through wire therein；Three-dimensional Magnetic Memory probe is the detecting means of whole device, why using many
Individual three-dimensional Magnetic Memory probe, one is in order that monitored area can circumferentially carry out omnidirectional's covering to drag-line, it is complete that raising is monitored
Face property, the second is being referred to when later data is handled, there is more Monitoring Data to be used as to ensure the standard of monitoring
True property, based on existing magnetic spy survey technology, current three-dimensional Magnetic Memory probe can pass through matched processing software realization pair
The digitlization of three-dimensional magnetic field, this causes characteristic parameter extraction when follow-up data is handled to become possibility；Centralized Controller is used for
Field management and the processing to data are carried out to three-dimensional Magnetic Memory probe, after the present invention program, Centralized Controller passes through
The Monitoring Data of three-dimensional Magnetic Memory probe can be just monitored to drag-line with the presence or absence of fracture of wire problem, and device of the invention builds ten
Divide convenient, in addition to it can apply on newly building bridge, be also suitable for installing servicing bridges additional.
In order that monitoring device can adapt to the drag-line of different-diameter, the invention also provides following preferred embodiment：
The support is made up of two supporters, is provided with jaw on the supporter, and two supporter jaws are relative, two jaws it
Between region form clamping area, drag-line is socketed in clamping area, is bolted between two supporters.When stent applications in
During the drag-line of different-diameter, it is only necessary to adjustment bolt length, with regard to that can enable the rack to be arranged on various sizes of drag-line, very
It is convenient.
In order to further improve device performance, the present invention has also made following improvement：Wireless transmission is provided with the support
Device；The wireless base station apparatus and Centralized Controller are arranged on support using inline mode；The support is wrapped with
Magnetic screen shell.After the result of Monitoring Data and Centralized Controller can be wirelessly sent to by wireless base station apparatus
Square tube platform, technical staff need not reach scene with regard to that can have access to field data and receive alarm signal, very convenient；Wireless hair
Send device and Centralized Controller rack-mount using inline mode, wireless base station apparatus and Centralized Controller can be played
Preferable protective effect, in addition, coordinating magnetic screen shell, can avoid the electromagnetic radiation pair of wireless base station apparatus and Centralized Controller
Three-dimensional Magnetic Memory probe is interfered, in addition, magnetic screen shell can also avoid support itself surrounding magnetic field from visiting three-dimensional Magnetic Memory
Head is interfered；The material that magnetic screen shell can select the low magnetic permeabilities such as aluminium, copper or plastics makes.
In order to further improve monitoring effect, the present invention has also made following improvement：The multiple three-dimensional Magnetic Memory probe is equal
Positioned at the homonymy of support, and multiple three-dimensional Magnetic Memory probes are at same sectional position on drag-line；The many pipes that are rigidly connected
Periphery is provided with cuff, and many pipes that are rigidly connected are strapped in drag-line surface by cuff；The cuff and the Guan Jun uses that are rigidly connected
Plastic material makes.Multiple three-dimensional Magnetic Memory probes are arranged at behind the same cross-sectional position of support homonymy, multiple three-dimensional Magnetic Memories
Relevance between the obtained Monitoring Data of probe is stronger, can more accurately reflect the time of day of drag-line, improves prison
The accuracy of survey；After pipe be rigidly connected by cuff bondage, it is possible to prevente effectively from the pipe that is rigidly connected is put under wind-force effect
It is dynamic, so as to ensure that the relative position of three-dimensional Magnetic Memory probe and drag-line is remained the same from beginning to end.
In order to shield the interference that electromagnetic field of high frequency is popped one's head in three-dimensional Magnetic Memory, the present invention has also made following improvement：Described three
Dimension Magnetic Memory probe is wrapped with aluminum hull or copper shell.
Based on aforementioned means scheme, the invention also provides a kind of seizure bridge cable based on metal magnetic memory technique is disconnected
The method of silk, involved hardware is as previously described；Specific processing method is as follows：1）By support, the pipe that is rigidly connected, Three-Dimensional Magnetic note
Recall probe and Centralized Controller is arranged on drag-line in the manner aforesaid；
2）The three-dimensional Magnetic Memory probe of Centralized Controller driving is monitored and the three-dimensional Magnetic Memory of extract real-time to surrounding magnetic field
The magnetic field signal that probe monitors are arrived；
3）Get after magnetic field signal, Centralized Controller is pre-processed using Wavelet-denoising Method to magnetic field signal, then
Characteristic parameter is extracted from pretreated magnetic field signal；The characteristic parameter includes：Normal direction gradient, tangential gradient, normal direction point
Measure power spectral energies value, tangential component power spectral energies value, normal component peak-to-peak value, tangential component peak-to-peak value, normal component phase
Place value, tangential component phase value, normal component accumulated value, tangential component accumulated value, normal component variance yields and tangential component side
Difference；
4）Characteristic parameter is compared with corresponding early warning thresholding：If characteristic parameter surmounts early warning thresholding, illustrate drag-line
Surrounding magnetic field fluctuation is larger, there is fracture of wire situation on drag-line, alarm signal should be sent immediately；If characteristic parameter is not over early warning door
Limit, illustrates fracture of wire situation is not present on drag-line, proceeds subsequent monitoring operation；The early warning thresholding is multiple, multiple early warning
Thresholding is corresponded with multiple characteristic parameters, and early warning thresholding is obtained by early stage l-G simulation test.
Normal direction in the appellation of foregoing various features parameter and tangentially divided on the basis of stayed structure；Normal direction gradient
It is the Grad in the both direction that is extracted from magnetic field signal with tangential gradient, normal component power spectral energies value and cuts
It is the power spectral energies value in the both direction extracted from magnetic field signal, normal component peak to component power spectrum energy value
Peak value and tangential component peak-to-peak value are between maximum signal level and minimum signal value in both direction in certain time-domain interval
Difference, normal component phase value and tangential component phase value are the phase in both direction；Wherein, normal direction/tangential component
Accumulated value and normal direction/tangential component variance yields are slightly different with foregoing several characteristic parameters, and normal direction/tangential component accumulated value is
Make the result after accumulation process to the normal component or tangential component in the magnetic field signal of multiple three-dimensional Magnetic Memories probes, normal direction/
Tangential component variance yields is that normal component or tangential component in the magnetic field signal to multiple three-dimensional Magnetic Memories probes are made at variance
Result after reason；8 kinds of characteristic parameters, can both have been carried out single to the corresponding magnetic field signal of single 3 D Magnetic Memory probe before treatment
Solely investigate, handled accordingly again after can also being averaged to the magnetic field signal of multiple three-dimensional Magnetic Memory probes, in processing last 4
It is that comprehensive investigate is made to the data of multiple three-dimensional Magnetic Memories probes when planting characteristic parameter；
The invention also provides following preferred process means：Step 4）In, when comparative feature parameter and early warning thresholding, from
A progress is selected in following four kinds of methods：
Method one：Appoint and take a kind of characteristic parameter, it is compared with corresponding early warning thresholding, if characteristic parameter surmounts correspondence
Early warning thresholding when, then send alarm signal；Otherwise follow-up monitoring processing is proceeded；
Method two：Appoint and take two kinds of characteristic parameters, two kinds of characteristic parameters are compared with corresponding early warning thresholding respectively, when two
When kind characteristic parameter surmounts respective early warning thresholding, then alarm signal is sent；Otherwise follow-up monitoring processing is proceeded；
Method three：Appoint and take various features parameter, various features parameter is compared with corresponding early warning thresholding respectively, when many
When kind characteristic parameter surmounts respective early warning thresholding, then alarm signal is sent；Otherwise follow-up monitoring processing is proceeded；
Method four：All characteristic parameters are compared with each self-corresponding early warning thresholding, if surmounting correspondence early warning thresholding
Characteristic parameter quantity reach after A values, then send alarm signal；Otherwise follow-up monitoring processing is proceeded；A takes 2 ~ 11.
Wherein, the processing mode of method one is relatively simple, and the processing expense of Centralized Controller is smaller, and Centralized Controller can be with
Higher-frequency time is monitored, and which kind of specifically chosen characteristic parameter, can be according to specific drag-line in l-G simulation test as monitoring object
Which kind of characteristic parameter is more sensitive to fracture of wire situation on material rationally determines；Method two and method three are to develop on the basis of method one
Strengthening version, method two and method three can make up one-sidedness of the method one in monitoring object to a certain extent, effectively reduction wrong report
Alert probability；Method four taken into account monitoring object it is comprehensive on the basis of, also looked after alarm accuracy；During concrete application,
Technical staff can be after the factors such as virtual condition, service life and the alarm demand of bridge be considered, in foregoing four kinds of methods
In select a use, two kinds in four kinds of alarm methods, three kinds or four kinds can be also combined, formed Multi-stage alarming mechanism.
The method have the benefit that：Bridge fracture of wire situation can be monitored, after fracture of wire problem is found, and
When make alert process, it is ensured that bridge operation safety.
Brief description of the drawings
Fig. 1, the present invention structural representation；
Changes of magnetic field curve map before and after Fig. 2, drag-line fracture of wire；
The corresponding title of the mark of each in figure is respectively：Support 1, magnetic screen shell 2, the pipe 3 that is rigidly connected, cuff 4, three-dimensional
Magnetic Memory probe 5, Centralized Controller 6, wireless base station apparatus 7, drag-line 8.
Embodiment
Referring to Fig. 1, a kind of device of the seizure bridge cable fracture of wire based on metal magnetic memory technique, including drawing to be monitored
Rope；Its innovation is：Described device is rigidly connected pipe 3, multiple three-dimensional Magnetic Memories probe 5 and Centralized Controller by support 1, many
6 compositions；The support 1 is arranged on drag-line；Centralized Controller 6 is arranged on support 1；Multiple three-dimensional Magnetic Memory probes 5 are set
In on drag-line, three-dimensional Magnetic Memory probe 5 is located at outside support 1, by being rigidly connected between three-dimensional Magnetic Memory probe 5 and support 1
Pipe 3 is connected, and three-dimensional Magnetic Memory probe 5 and the pipe 3 that is rigidly connected are corresponded；Multiple three-dimensional Magnetic Memory probes 5 pass through many respectively
Wire is electrically connected with Centralized Controller 6, and the wire, which is placed in, to be rigidly connected in pipe 3.
Further, the support 1 is made up of two supporters, and jaw, two supporters are provided with the supporter
Jaw is relative, and the region between two jaws forms clamping area, and drag-line is socketed in clamping area, and spiral shell is passed through between two supporters
Tether and connect.
Further, it is provided with wireless base station apparatus 7 on the support 1；The wireless base station apparatus 7 and Centralized Controller
6 are arranged on support 1 using inline mode；The support 1 is wrapped with magnetic screen shell 2.
Further, the multiple three-dimensional Magnetic Memory probe 5 is respectively positioned on the homonymy of support 1, and multiple three-dimensional Magnetic Memories are visited
First 5 are located on drag-line at same sectional position；The periphery of many pipes 3 that are rigidly connected is provided with cuff 4, and cuff 4 is by many rigidity
Connecting tube 3 is strapped in drag-line surface；The cuff 4 and the pipe 3 that is rigidly connected are made using plastic material.
Further, the three-dimensional Magnetic Memory probe 5 is wrapped with aluminum hull or copper shell.
A kind of method of the seizure bridge cable fracture of wire based on metal magnetic memory technique, involved hardware include support 1,
The many pipes 3 that are rigidly connected, multiple three-dimensional Magnetic Memory probes 5 and Centralized Controller 6, the support 1 are arranged on drag-line；Concentrate control
Device 6 processed is arranged on support 1；Multiple three-dimensional Magnetic Memory probes 5 are arranged on drag-line, and three-dimensional Magnetic Memory probe 5 is located at outside support 1
Portion, is connected between three-dimensional Magnetic Memory probe 5 and support 1 by the pipe 3 that is rigidly connected, three-dimensional Magnetic Memory probe 5 and the pipe 3 that is rigidly connected
Correspond；Multiple three-dimensional Magnetic Memory probes 5 are electrically connected by multiple conducting wires with Centralized Controller 6 respectively, and the wire is put
In in the pipe 3 that is rigidly connected；
Its innovation is：Methods described includes：1）By support 1, the pipe 3 that is rigidly connected, three-dimensional Magnetic Memory probe 5 and concentration control
Device 6 processed is arranged on drag-line in the manner aforesaid；
2）Centralized Controller 6 drives 5 pairs of surrounding magnetic fields of three-dimensional Magnetic Memory probe to be monitored and extract real-time Three-Dimensional Magnetic note
Recall the magnetic field signal that probe 5 is monitored；
3）Get after magnetic field signal, Centralized Controller 6 is pre-processed using Wavelet-denoising Method to magnetic field signal, then
Characteristic parameter is extracted from pretreated magnetic field signal；The characteristic parameter includes：Normal direction gradient, tangential gradient, normal direction point
Measure power spectral energies value, tangential component power spectral energies value, normal component peak-to-peak value, tangential component peak-to-peak value, normal component phase
Place value, tangential component phase value, normal component accumulated value, tangential component accumulated value, normal component variance yields and tangential component side
Difference；Preceding feature parameter is the data type got by existing signal processing means.
4）Characteristic parameter is compared with corresponding early warning thresholding：If characteristic parameter surmounts early warning thresholding, illustrate drag-line
Surrounding magnetic field fluctuation is larger, there is fracture of wire situation on drag-line, alarm signal should be sent immediately；If characteristic parameter is not over early warning door
Limit, illustrates fracture of wire situation is not present on drag-line, proceeds subsequent monitoring operation；The early warning thresholding is multiple, multiple early warning
Thresholding is corresponded with multiple characteristic parameters, and early warning thresholding is obtained by early stage l-G simulation test.
Further, step 4）In, when comparative feature parameter and early warning thresholding, a progress is selected from following four kinds of methods：
Method one：Appoint and take a kind of characteristic parameter, it is compared with corresponding early warning thresholding, if characteristic parameter surmounts correspondence
Early warning thresholding when, then send alarm signal；Otherwise follow-up monitoring processing is proceeded；
Method two：Appoint and take two kinds of characteristic parameters, two kinds of characteristic parameters are compared with corresponding early warning thresholding respectively, when two
When kind characteristic parameter surmounts respective early warning thresholding, then alarm signal is sent；Otherwise follow-up monitoring processing is proceeded；
Method three：Appoint and take various features parameter, various features parameter is compared with corresponding early warning thresholding respectively, when many
When kind characteristic parameter surmounts respective early warning thresholding, then alarm signal is sent；Otherwise follow-up monitoring processing is proceeded；
Method four：All characteristic parameters are compared with each self-corresponding early warning thresholding, if surmounting correspondence early warning thresholding
Characteristic parameter quantity reach after A values, then send alarm signal；Otherwise follow-up monitoring processing is proceeded；A takes 2 ~ 11.
It is that shown two curves are that the magnetic field corresponded to respectively before and after drag-line fracture of wire obtained in experiment becomes referring to Fig. 2, in figure
Change curve；It can be seen that occurring before fracture of wire, because drag-line inner wire is continuous whole, the change of its field curve is more gentle,
And certain tendency is generally there are, and after drag-line fracture of wire, the ess-strain on steel wire that remaining does not break due to drag-line inside
State is redistributed, and causes drag-line surrounding magnetic field to change so that larger fluctuation occurs in changes of magnetic field curve.
Claims (3)
1. a kind of device of the seizure bridge cable fracture of wire based on metal magnetic memory technique, including drag-line to be monitored；Its feature
It is：Described device is by support (1), many pipes that are rigidly connected (3), multiple three-dimensional Magnetic Memory probes (5) and Centralized Controller (6)
Composition；The support (1) is arranged on drag-line；Centralized Controller (6) is arranged on support (1)；Multiple three-dimensional Magnetic Memory probes
(5) be arranged on drag-line, it is outside that three-dimensional Magnetic Memory probe (5) is located at support (1), three-dimensional Magnetic Memory probe (5) and support (1) it
Between pass through the pipe that is rigidly connected (3) and connect, three-dimensional Magnetic Memory probe (5) and the pipe that is rigidly connected (3) one-to-one corresponding；Multiple Three-Dimensional Magnetic notes
Recall probe (5) to be electrically connected by multiple conducting wires and Centralized Controller (6) respectively, the wire is placed in the pipe that is rigidly connected (3)；
The support (1) is made up of two supporters, and jaw is provided with the supporter, and two supporter jaws are relative, and two
Region between individual jaw forms clamping area, and drag-line is socketed in clamping area, is bolted, passes through between two supporters
Adjustment bolt length enables the rack to be arranged on various sizes of drag-line；
Wireless base station apparatus (7) is provided with the support (1)；The wireless base station apparatus (7) and Centralized Controller (6) are adopted
It is arranged at inline mode on support (1)；The support (1) is wrapped with magnetic screen shell (2)；
The multiple three-dimensional Magnetic Memory probe (5) is respectively positioned on the homonymy of support (1), and multiple three-dimensional Magnetic Memory probes (5) are located at
On drag-line at same sectional position；The periphery of many pipes that are rigidly connected (3) is provided with cuff (4), and cuff (4) connects many rigidity
Adapter (3) is strapped in drag-line surface, and the multiple three-dimensional Magnetic Memory is popped one's head in (5) and the relative position of drag-line is remained the same from beginning to end；It is described
Cuff (4) and the pipe that is rigidly connected (3) are made using plastic material.
2. the device of the seizure bridge cable fracture of wire according to claim 1 based on metal magnetic memory technique, its feature exists
In：The three-dimensional Magnetic Memory probe (5) is wrapped with aluminum hull or copper shell.
3. a kind of method of the seizure bridge cable fracture of wire based on metal magnetic memory technique, involved hardware include support (1),
Many pipes that are rigidly connected (3), multiple three-dimensional Magnetic Memory probes (5) and Centralized Controller (6), the support (1) are arranged at drag-line
On；Centralized Controller (6) is arranged on support (1)；Multiple three-dimensional Magnetic Memory probes (5) are arranged on drag-line, three-dimensional Magnetic Memory
Popping one's head in, (5) are outside positioned at support (1), and three-dimensional Magnetic Memory, which is popped one's head in, passes through the pipe that is rigidly connected (3) connection, three between (5) and support (1)
Tie up Magnetic Memory probe (5) and the pipe that is rigidly connected (3) is corresponded；Multiple three-dimensional Magnetic Memory probes (5) pass through multiple conducting wires respectively
It is electrically connected with Centralized Controller (6), the wire is placed in the pipe that is rigidly connected (3)；
It is characterized in that：Methods described includes：1) by support (1), the pipe that is rigidly connected (3), three-dimensional Magnetic Memory probe (5) and concentration
Controller (6) is arranged on drag-line in the manner aforesaid；
2) the three-dimensional Magnetic Memory probe (5) of Centralized Controller (6) driving is monitored and extract real-time Three-Dimensional Magnetic note to surrounding magnetic field
Recall the magnetic field signal that probe (5) is monitored；
3) get after magnetic field signal, Centralized Controller (6) is first pre-processed using Wavelet-denoising Method to magnetic field signal, then
Characteristic parameter is extracted from pretreated magnetic field signal；The characteristic parameter includes：Normal direction gradient, tangential gradient, normal direction point
Measure power spectral energies value, tangential component power spectral energies value, normal component peak-to-peak value, tangential component peak-to-peak value, normal component phase
Place value, tangential component phase value, normal component accumulated value, tangential component accumulated value, normal component variance yields and tangential component side
Difference；
4) characteristic parameter is compared with corresponding early warning thresholding：If characteristic parameter surmounts early warning thresholding, illustrate around drag-line
Magnetic fluctuation is larger, there is fracture of wire situation on drag-line, and alarm signal should be sent immediately；If characteristic parameter is not over early warning thresholding,
Illustrate fracture of wire situation is not present on drag-line, proceed subsequent monitoring operation；The early warning thresholding is multiple, multiple early warning thresholdings
Corresponded with multiple characteristic parameters, early warning thresholding is obtained by early stage l-G simulation test；When comparative feature parameter and early warning thresholding, from
A progress is selected in following four kinds of methods：
Method one：Appoint and take a kind of characteristic parameter, it is compared with corresponding early warning thresholding, if characteristic parameter surmounts corresponding pre-
During alert thresholding, then alarm signal is sent；Otherwise follow-up monitoring processing is proceeded；
Method two：Appoint and take two kinds of characteristic parameters, two kinds of characteristic parameters are compared with corresponding early warning thresholding respectively, as two kinds of spies
When levying parameter and surmounting respective early warning thresholding, then alarm signal is sent；Otherwise follow-up monitoring processing is proceeded；
Method three：Appoint and take various features parameter, various features parameter is compared with corresponding early warning thresholding respectively, as a variety of spies
When levying parameter and surmounting respective early warning thresholding, then alarm signal is sent；Otherwise follow-up monitoring processing is proceeded；
Method four：All characteristic parameters are compared with each self-corresponding early warning thresholding, if surmounting the spy of correspondence early warning thresholding
Levy number of parameters to reach after A values, then send alarm signal；Otherwise follow-up monitoring processing is proceeded；A takes 2~11.
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