CN202661213U - Coupled and externally-mounted steel stay rope force detection device - Google Patents
Coupled and externally-mounted steel stay rope force detection device Download PDFInfo
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- CN202661213U CN202661213U CN 201220198293 CN201220198293U CN202661213U CN 202661213 U CN202661213 U CN 202661213U CN 201220198293 CN201220198293 CN 201220198293 CN 201220198293 U CN201220198293 U CN 201220198293U CN 202661213 U CN202661213 U CN 202661213U
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Abstract
The utility model discloses a coupled and externally-mounted steel stay rope force detection device. The device comprises an excitation assembly and a winding displacement coupling sensor, wherein the excitation assembly comprises a magnetic core, an excitation coil with a capacitive discharge circuit is sheathed on the magnetic core, a first magnetic pole and a second magnetic pole are arranged at two ends of the magnetic core and are respectively provided with a first pressing plate and a second pressing plate, the first magnetic pole and the first pressing plate are detachably connected, the second magnetic pole and the second pressing plate are detachably connected, a first clamping hole is arranged at a connecting part of the first magnetic pole and the first pressing plate, a second clamping hole is arranged at a connecting part of the second magnetic pole and the second pressing plate, and round lining pads are arranged on the inner walls of the first clamping hole and the second clamping hole. A method comprises the steps of using the device in detection to obtain magnetic feature curves of a steel stay rope to be detected; using the device in detection to obtain a group of standard magnetic feature curves; and comparing the magnetic feature curves of the steel stay rope to be detected with the group of standard magnetic feature curves to obtain the tension in the steel stay rope to be detected.
Description
Technical field
The utility model relates to Magnetic Materials Neo-Confucianism, electrotechnics, the Intelligent Measurement technology of ferromagnetic material, is specifically related to the steel cable in monitoring structural health conditions field or tension or the tension measurement of steel rod elements, also relates to magnetomechanical effect and the magnetization characteristic of ferromagnetic material.
Technical background
Steel cable is as the core component in the Important building structures such as different types of rridges, stadiums, and its safety problem is most important, is the important means that guarantees its security to the monitoring of steel cable pulling force.Present detection method mainly contains:
1, manometric method
Claim again the lifting jack method, it is to detect stretching force by measuring oil pressure with the jack tension steel cable time, and the measurement of oil pressure can be finished by tensimeter or pressure transducer, and this method is applicable to the detection in the work progress.
2, the pulling force direct method of measurement
Pulling force sensor measurement steel cable Suo Li directly is being installed on the dragline anchorage or on the ground tackle connecting link, and this method cost is high, and uses very inconvenient.
3, frequency method
Measure the natural frequency of vibration of steel cable, utilize the relation of the natural frequency of vibration and Suo Li to measure Suo Li, this method is suitable for the detection of active service steel cable, but because there is complicacy in the relation of the natural frequency of vibration and Suo Li, in application limitation is arranged.
4, magnetomechanical effect method
Magnetomechanics (magnetomechanical) effect was found in for 19th century, Canada has specialized in the impact of ferromagnetic material internal stress on magnetic history at the beginning of the eighties, the U.S. has developed telescopic magnetic flux transducer and Suo Li detector after 2000, and Germany and France have also developed eddy current sensor and Suo Li detector.Be summed up, existing have following two kinds of implementation methods based on magnetomechanical effect method detection steel cable Suo Li:
(1) magnetic flux mensuration: be made into telescopic magnetic flux transducer, at first measure the variation of magnetic flux, be converted into again relative permeability, utilize the relation of magnetic permeability and tension to measure Suo Li, this method must be good with installation of sensors when construction, non-disconnectable removing, Fig. 1 is the synoptic diagram of this method.
(2) inductance value mensuration: because the existence of magnetomechanical effect, can be subject to the impact of tension with the inductance value of the close coil of steel cable, the inductance value of measuring coil namely can be converted into Suo Li.This method has again two kinds of ways, the one, radially the inductance value mensuration (claims again eddy-current method, the EC sensor), be that measuring coil is vertical with steel cable, in order to reach preferably measurement data, at the coil of periphery more than at least 6, sensor and surveying instrument are comparatively complicated according to the steel cable diameter, effect is general, and Fig. 2 is the synoptic diagram of this method; The 2nd, axial inductance value mensuration, namely measuring coil is peripheral around steel cable, and this method needs at the scene coiling, and Fig. 3 is the synoptic diagram of this method.The inductance value mensuration can only reflect the internal stress of steel cable top layer steel wire, can not reflect the magnetomechanical effect of drag-line integral body.
In sum, also there is two large problems at present in steel cable Suo Li detection method:
1, the Suo Li test problems of active service steel cable does not have fine solution
Use to such an extent that comparatively ripe rope force detection sensor is telescopic magnetic flux transducer both at home and abroad, only when stretching construction, set up, could satisfy the online detection of operational phase, not only waste is large, and the life-span is limited, what is more important, a large amount of active service steel cables do not dispose this sensor.Although, can adopt the method for on-the-spot coiling to make magnetic flux transducer or inductance value sensor, there are the problems such as large, the consuming time length of difficulty, detection and demarcation state be inconsistent in this method.
2, detection sensitivity is low, repeatability is bad
Although magnetic flux transducer or inductance value sensor have utilized magnetomechanical effect, but they have only measured the single-point parameter on the ferromagnetic material magnetization characteristic, be near magnetic permeability or the inductance value certain working point, certainly exist like this that susceptibility to pulling force is low, the problem of bad measurement repeatability.
The utility model content
The utility model provides a kind of can measure coupled mode fitted outside steel cable cable force detecting device highly sensitive and good reproducibility to active service steel cable enforcement Suo Li detection and tool.
The utility model adopts following technical scheme:
A kind of coupled mode fitted outside steel cable cable force detecting device described in the utility model, comprise: excitatory assembly and displacement type coupled-inductors, described excitatory assembly comprises magnetic core, be arranged with magnetizing coil at magnetic core, at the two ends of magnetizing coil and be connected to the condenser type discharge circuit, be respectively equipped with the first magnetic pole and the second magnetic pole at the two ends of magnetic core, be respectively equipped with the first pressing plate and the second pressing plate at the first magnetic pole and the second magnetic pole, and, be connected for removable jew between the first magnetic pole and the first pressing plate, be connected for removable jew between the second magnetic pole and the second pressing plate, be provided with the first clamping hole for the clamping steel cable in the junction of the first magnetic pole and the first pressing plate, be provided with the second clamping hole for the clamping steel cable in the junction of the second magnetic pole and the second pressing plate, be respectively equipped with ring gasket at the inwall of the first clamping hole and the second clamping hole; Described displacement type coupled-inductors comprises wire in a row, is connected with contact pin at an end of every wire, is connected with the jack that is complementary with contact pin at the other end of every wire, is connected for plug-in between the jack on the contact pin on each root wire and the adjacent wires.
The utility model has the advantage of:
1, having solved telescopic magnetic flux transducer can't be to the tension measurement problem of active service steel cable or steel rod elements.Because excitatory assembly adopted external-mounted structure, can be clamped in easily on the tested member, and need to be in the construction stage just with sensor sleeve on steel cable.The displacement type inductor has been adopted in the detection of coupled signal, does not need on-the-spot coiling, convenient mounting or dismounting.Because the utility model has adopted capacitor discharging circuit, so that the induced voltage signal in the inductive coupling coil is larger, therefore, detection method of the present utility model does not have too much requirement to the quantity of the number of turn of inductive coil, thereby the displacement type coupled-inductors is achieved.
2, measurement sensitivity and repeatability have been improved.Measuring principle of the present utility model is to utilize magnetomechanical effect, the essence of magnetomechanical effect is that the ferromagnetic material magnetization characteristic changes (this is a process) with stress, and the variation of the variation of magnetic permeability or inductance value is two kinds of presentations of this effect, and magnetic permeability or inductance value parameter can change along with the difference of the working point on the magnetization characteristic.(measure magnetic permeability by magnetic flux with these two kinds of methods, direct inductance measuring amount) difference, the utility model is not simply to measure magnetic permeability or the such single parameter of inductance value detects steel cable stretching force, but detect by magnetization characteristic, therefore the susceptibility of counter stress is high, and owing to the overall process of measuring process through the electromagnetic energy conversion, measurement result is not magnetized the impact of working point again, the measured value of stress is to draw after a lot of data are processed, so measuring repeatability is good.Fig. 7 has shown measuring method of the present utility model and other two kinds of method differences on principle, and among the figure, regional A is the measured zone of inductance value method, and is obviously insensitive to tension, during measurement only certain point in this zone carry out the measurement of inductance value; Zone B is the measured zone of magnetic flux method, and the method is measured magnetic permeability by magnetic flux, and is maximum at this regional relative permeability, but should the zone also responsive not to tension, during measurement only certain point in this zone carry out the measurement of relative permeability; Zone C is this mensuration region, and is obviously stronger to the susceptibility of tension.Figure 8 shows that measurement result of the present utility model.
3, compare with the inductance value mensuration, measurement result is truer.Because it is excitatory that the inductance value mensuration does not apply steel cable, make the inner uniform magnetization of tested steel cable, so measurement result can only reflect the stress state on steel cable top layer.In fact, steel cable is comprised of many strands of steel wires, and the stress of per share steel wire is all inhomogeneous, and inside and outside steel wire is stressed also inhomogeneous, and what we needed is the whole force-bearing situation of steel cable, therefore needs the excitatory steel cable inside that makes that uniform magnetic field is arranged.Measuring method of the present utility model meets this requirement fully, and measurement result is more authentic and valid.
4, reduced the measurement cost.Because telescopic sensor need to be installed on every steel cable when construction, cost is very high, and the life-span is limited, and the utility model only needs to install when measuring, and is namely dismountable after having surveyed, reusable, and without life problems.
5, saved Measuring Time.Magnetic flux mensuration or inductance value mensuration need on-the-spot coiling, need isolated plant during coiling at the scene, and measuring needs the expensive time to remove after finishing.Therefore the utility model has saved Measuring Time owing to do not need on-the-spot coiling, and the overall process of finishing one-shot measurement only needs a few minutes.In addition, on-the-spot coiling is so that measuring state and demarcation state are very difficult in full accord, and measurement result has deviation.And the utility model also efficiently solves this problem.
6, easy to use.In the utility model, excitatory assembly is an integral body, only needs with pressing plate and fastening bolt its clamping to be got final product, and the winding displacement inductor only needs to get final product inserting.Electrical connector on the sensor also welds in advance, need not field fabrication, directly is connected and can measures with detecting instrument, uses very convenient.
Description of drawings
Fig. 1 is existing telescopic magnetic flux transducer synoptic diagram;
Fig. 2 is existing radial pulling force sensor synoptic diagram;
Fig. 3 is existing axial type pulling force sensor synoptic diagram;
Fig. 4 is apparatus structure synoptic diagram of the present utility model;
Fig. 5 is the side view of apparatus structure of the present utility model;
Fig. 6 is the structural representation of the utility model displacement type coupled-inductors;
Fig. 7 is the magnetomechanical effect curve map of explanation the utility model principle of work;
Fig. 8 is measurement result figure of the present utility model.
Embodiment
Embodiment 1
A kind of coupled mode fitted outside steel cable cable force detecting device, comprise: excitatory assembly and displacement type coupled-inductors, described excitatory assembly comprises magnetic core 2, be arranged with magnetizing coil 3 at magnetic core 2, at the two ends of magnetizing coil 3 and be connected to the condenser type discharge circuit, described condenser type discharge circuit can adopt condenser type discharge circuit common in the prior art, but, condenser type discharge circuit role in the utility model is different from prior art, to be converted into magnetic field energy for the electric field energy moment that will store, realization is to the magnetization of tested steel cable, be respectively equipped with the first magnetic pole 41 and the second magnetic pole 42 at the two ends of magnetic core 2, be respectively equipped with the first pressing plate 61 and the second pressing plate 62 at the first magnetic pole 41 and the second magnetic pole 42, and, be connected for removable jew between the first magnetic pole 41 and the first pressing plate 61, be connected for removable jew between the second magnetic pole 42 and the second pressing plate 62, be provided with the first clamping hole for the clamping steel cable in the junction of the first magnetic pole 41 and the first pressing plate 61, be provided with the second clamping hole for the clamping steel cable in the junction of the second magnetic pole 42 and the second pressing plate 62, be respectively equipped with ring gasket 5 at the inwall of the first clamping hole and the second clamping hole; Described displacement type coupled-inductors comprises wire 8 in a row, end at every wire is connected with contact pin 9, the other end at every wire is connected with the jack 10 that is complementary with contact pin, is connected for plug-in between the jack on the contact pin on each root wire and the adjacent wires.
A kind of the utility model that utilizes is as follows to the method that Suo Li detects:
1) excitatory assembly clamping is formed energizing loop in the steel cable outside to be detected and by excitatory assembly and steel cable to be detected, wire in a row 8 in the displacement type coupled-inductors is wrapped on the steel cable to be detected of energizing loop, again the contact pin on each the root wire in the wire 8 in a row is inserted in the jack on the adjacent wires, open the condenser type discharge circuit be connected with excitatory assembly and discharged to the magnetizing coil 3 in the excitatory assembly by the condenser type discharge circuit, thereby in steel cable to be detected, produce magnetic field intensity, simultaneously, detect and obtain exciting curent in the magnetizing coil 3, described displacement type coupled-inductors obtains to contain the magnetic induction density in the steel cable to be measured of pulling force information by induction, detect simultaneously and obtain voltage in the displacement type coupled-inductors, formed again the magnetization characteristic of steel cable to be detected by the voltage in the exciting curent in the magnetizing coil 3 and the displacement type coupled-inductors
2) get one section steel cable identical with steel cable to be detected and use steel cable as demarcating, to demarcate with steel cable and be installed on the tension tester, excitatory assembly clamping is being demarcated with forming energizing loop with steel cable outside the steel cable and by excitatory assembly and demarcation, wire in a row 8 in the displacement type coupled-inductors is wrapped in the demarcation of energizing loop with on the steel cable, again the contact pin on each the root wire in the wire 8 in a row is inserted in the jack on the adjacent wires, open tension tester, apply one group of pulling force to demarcating with steel cable, recycling normal magnetization family curve assay method, obtain one group of normal magnetization family curve
Described normal magnetization family curve assay method is: open the condenser type discharge circuit be connected with excitatory assembly and discharged to the magnetizing coil 3 in the excitatory assembly by the condenser type discharge circuit, thereby in demarcating with steel cable, produce magnetic field intensity, simultaneously, detect and obtain exciting curent in the magnetizing coil 3, described displacement type coupled-inductors obtains to contain pulling force information by induction demarcation is with the magnetic induction density in the steel cable, detect simultaneously and obtain voltage in the displacement type coupled-inductors, form the magnetization characteristic of demarcating with steel cable by the voltage in the exciting curent in the magnetizing coil 3 and the displacement type coupled-inductors again, and to demarcate magnetization characteristic with steel cable as the normal magnetization family curve
3) magnetization characteristic and the one group of normal magnetization family curve with steel cable to be detected compares, and obtains the pulling force in the steel cable to be detected.
Being implemented as follows of coupled mode fitted outside steel cable cable force detecting device:
Coupled mode fitted outside steel cable cable force detecting device is comprised of two parts.The one, excitatory assembly, the 2nd, the displacement type coupled-inductors, such as Fig. 4, Fig. 5, shown in Figure 6, measurand 1 is born the member of tension (or compressive stress) for steel cable or steel rod elements etc.Composition and the functions of excitatory assembly are as follows: magnetic core 2 is made by electromagnetic pure iron, plays the magnetic conduction effect; Magnetizing coil 3 is for generation of excitatory magnetic field; The first magnetic pole 41 and the second magnetic pole 42 are made by electromagnetic pure iron, and excitatory magnetic field intensity is imported tested steel cable; Ring gasket 5 is used for control magnetic circuit gap, is non-magnet material; The first pressing plate 61 and the second pressing plate 62 are made by electromagnetic pure iron, and it is comparatively even that excitatory magnetic field is distributed, by fastening bolt 7 with excitatory assembly and the clamping of tested steel cable.The winding displacement coupled-inductors is comprised of winding displacement 8, contact pin 9, jack 10, and contact pin is connected with adjacent jack, consists of the inductive coupling coil when peripheral when being wrapped in steel cable, for detection of the magnetic induction density of the coupled magnetic field of steel cable inside.
Above-mentioned coupled mode fitted outside steel cable cable force detecting device can be installed on steel cable or steel rod elements easily, removes easily after finishing using.
The realization principle of coupled mode fitted outside steel cable Suo Li detection method is as follows:
Form a coupled mode electromagnetic induction device by magnetic core, magnetic pole, tested steel cable between magnetizing coil and the winding displacement inductor, after the drive coil energising magnetic field intensity is imported steel cable, and the winding displacement inductor detects the magnetic field intensity of steel cable inside.According to the magnetomechanical effect principle, when tested member was subject to stretching, the tension of Ferromagnetic Material can make magnetization characteristic change.Figure 7 shows that a typical magnetization characteristic, when tension increased, the magnetic induction density of magnetization characteristic had obviously and reduces.In exciting curent fast rise process, constantly detect the voltage signal in exciting curent signal and the winding displacement inductor, form magnetization characteristic, thereby realize the detection of pulling force.
In the utility model, the method that applies magnetic field intensity to steel cable is to adopt capacity discharge method.During work, the electric discharge device at first electric capacity in the discharge circuit charges, and electric field energy is stored in electric capacity, charges and magnetizing coil is discharged after complete again, and electric field energy is converted into magnetic field energy, and the process of discharge is the magnetized process of steel cable.Discharge process is very of short duration, can not make excitatory assembly heating, continuously Reusability.In discharge process, the exciting curent in the data acquisition module continuous acquisition magnetizing coil and the induced voltage signal in the winding displacement inductor.After discharge process finished, data acquisition module was preserved image data and process, and shows testing result.
Because principle of the present utility model is based on magnetomechanical effect, need to carry out tested steel cable or steel rod elements excitatoryly, and reach certain magnetic field intensity.Therefore, for the steel cable to be measured of different sizes, need the magnetizer of design different size.During enforcement, can design a series of steel cable Suo Li magnetizer to the steel cable size of stipulating in the standard, each magnetizer satisfies several steel cable sizes, and then magnetizer series can satisfy the detection demand of all steel cables.
Because principle of the present utility model is based on magnetomechanical effect, need to demarcate in advance the magnetization characteristic of tested drag-line or steel rod elements when therefore implementing.For the sake of simplicity, also can be in the steel cable work progress, the pressure transducer that utilization is accurate etc. carries out on-site proving.Nominal data will be stored in database, in order in the whole lifetime of steel cable it is carried out health monitoring.
More than to the description of the utility model embodiment further clear and definite implementing method of the present utility model, but do not consist of restriction of right to device of the present utility model.Any improvement and modification that does not break away from the utility model device all belongs to interest field of the present utility model.
Claims (1)
1. coupled mode fitted outside steel cable cable force detecting device, it is characterized in that, comprise: excitatory assembly and displacement type coupled-inductors, described excitatory assembly comprises magnetic core (2), be arranged with magnetizing coil (3) at magnetic core (2), at the two ends of magnetizing coil (3) and be connected to the condenser type discharge circuit, be respectively equipped with the first magnetic pole (41) and the second magnetic pole (42) at the two ends of magnetic core (2), be respectively equipped with the first pressing plate (61) and the second pressing plate (62) at the first magnetic pole (41) and the second magnetic pole (42), and, be connected for removable jew between the first magnetic pole (41) and the first pressing plate (61), be connected for removable jew between the second magnetic pole (42) and the second pressing plate (62), be provided with the first clamping hole for the clamping steel cable in the junction of the first magnetic pole (41) and the first pressing plate (61), be provided with the second clamping hole for the clamping steel cable in the junction of the second magnetic pole (42) and the second pressing plate (62), be respectively equipped with ring gasket (5) at the inwall of the first clamping hole and the second clamping hole; Described displacement type coupled-inductors comprises wire in a row (8), end at every wire is connected with contact pin (9), the other end at every wire is connected with the jack (10) that is complementary with contact pin, is connected for plug-in between the jack on the contact pin on each root wire and the adjacent wires.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220198293 CN202661213U (en) | 2012-05-04 | 2012-05-04 | Coupled and externally-mounted steel stay rope force detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220198293 CN202661213U (en) | 2012-05-04 | 2012-05-04 | Coupled and externally-mounted steel stay rope force detection device |
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| CN202661213U true CN202661213U (en) | 2013-01-09 |
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| CN 201220198293 Expired - Fee Related CN202661213U (en) | 2012-05-04 | 2012-05-04 | Coupled and externally-mounted steel stay rope force detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680156A (en) * | 2012-05-04 | 2012-09-19 | 东南大学 | Coupled external mounted steel stay rope force detection device and method |
| CN103675721A (en) * | 2013-12-24 | 2014-03-26 | 江西飞尚科技有限公司 | Open-loop magnetic flux sensor |
| CN108489641A (en) * | 2018-03-20 | 2018-09-04 | 重庆交通大学 | A kind of prestress wire stress measurement device and method |
-
2012
- 2012-05-04 CN CN 201220198293 patent/CN202661213U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680156A (en) * | 2012-05-04 | 2012-09-19 | 东南大学 | Coupled external mounted steel stay rope force detection device and method |
| CN102680156B (en) * | 2012-05-04 | 2013-11-06 | 东南大学 | Coupled external mounted steel stay rope force detection device and method |
| CN103675721A (en) * | 2013-12-24 | 2014-03-26 | 江西飞尚科技有限公司 | Open-loop magnetic flux sensor |
| CN103675721B (en) * | 2013-12-24 | 2017-01-18 | 江西飞尚科技有限公司 | Open-loop magnetic flux sensor |
| CN108489641A (en) * | 2018-03-20 | 2018-09-04 | 重庆交通大学 | A kind of prestress wire stress measurement device and method |
| CN108489641B (en) * | 2018-03-20 | 2020-06-02 | 重庆交通大学 | Stress measuring device and method for prestressed steel strand |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20130504 |