CN105203624A - Novel ferromagnetic material detection device and method - Google Patents
Novel ferromagnetic material detection device and method Download PDFInfo
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- CN105203624A CN105203624A CN201510564320.4A CN201510564320A CN105203624A CN 105203624 A CN105203624 A CN 105203624A CN 201510564320 A CN201510564320 A CN 201510564320A CN 105203624 A CN105203624 A CN 105203624A
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- strain
- strain variation
- ferromagnetic material
- variation rate
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Abstract
The invention discloses a novel ferromagnetic material detection device. The novel ferromagnetic material detection device comprises a beam, a magnetic block and fixed parts which are arranged on the left end and the right end of the beam, wherein a strain gauge is arranged in the middle part of the lower end surface of the beam, and a magnetic block is arranged in the middle part of the upper end surface of the beam in a suspending manner by virtue of a boss. The invention also discloses a ferromagnetic material detection method utilizing the novel ferromagnetic material detection device. The variable quantity of a magnetic field is converted to detection strain capacity, whether a ferromagnetic material exists on a conveyor belt is detected according to the strain value, if the ferromagnetic material exists, the size of the ferromagnetic material along the material conveying direction is given, and the relative size of the corresponding ferromagnetic material is judged according to a maximum value of the strain variation rate corresponding to each strain variation period. The novel ferromagnetic material detection device is simple in structure and convenient to debug.
Description
Technical field
The present invention relates to a kind of novel ferromagnetic material detection device and method, belonging to metal detection technical field, is a kind of ferromagnetic parts detection method based on strain detecting.
Background technology
Industrial and mining enterprises use all kinds of mineral raw materials of Belt Conveying in a large number.Belt consumption is large, cost is high, accounts for about the 30%-50% of conveyor cost, therefore, ensures that it is normal, running is stably most important.
Can not be there is longitudinal tear phenomenon in the belt of band conveyor, only have when the serious sideslip of belt or outside pointed object, as just caused preventing belt from scratches when steel plate, iron block, joist steel, anchor pole etc. protrude into belt, tear time serious in normal operation.Belt deviation causes belt tearing generally only to tear belt edge, can not destroy inside belt.Prevent belt deviation ratio to be easier to, install on request during installation, normally use, generally there will not be serious belt tearing accident.And cause preventing belt from scratches or longitudinal tear accident to be the damage type that a kind of destructiveness is very strong because ferromagnetic pointed object such as grade protrudes into belt, once there is belt tearing accident, be worth the belt of unit even up to a million of hundreds thousand of unit, will damage in several minutes, have a strong impact on normal production, cause the long-time heavy economic losses stopped production.Therefore, in order to really realize the efficient, clean of conveying mineral and extend belt life, the detection of the middle ferromagnetic parts of necessary Real-Time Monitoring convey materials.
The source of ferromagnetic parts mainly contains several aspect: 1. because the hard object such as hammer drill, joist steel used in construction is left in material by carelessness of workmen.2. feeding device in material transport system, stop gauge connect insecure due to parts in processing, aging etc. cause section components to come off.3. in material gatherer process, anchor recovering is not thorough, enters belt etc. with band conveyor.At present, the detection of ferromagnetic parts adopts metal detection device more.Metal detector utilizes electromagnetic induction principle, convert changes of magnetic field amount to digital signal, digital signal exports the information of ferromagnetic parts as calculated after machine process, this device structure is complicated, site installation test is pretty troublesome, particularly at variable environment, cannot be adjusted it especially use, equipment is easy to be subject to external interference in addition, output error message, such as ferromagnetic detection machine (publication number CN102879750A) is though can raise the efficiency, and system architecture is complicated, adds on large-scale conveying belt containing the cost that ferromagnetic parts detects.And front iron part of belt-type constant magnetic iron remover pick-up unit (publication number CN101846652A) utilizes changes of magnetic field to detect and remove assorted ironware, this system achieves the detection of ferromagnetic and removes integration, can effectively remove small-sized ferromagnetic, but it is comparatively large to size, heavier-weight or the ferromagnetic of pile things on below material helpless, and large ferromagnetic is the main cause causing belt tearing.
Being found by system investigation, mainly there is following problem in existing metal detection device: 1) system architecture is complicated, the limit be suitable for, and cost is high, Installation and Debugging difficulty; 2) be subject to the impact that electromagnetism infects, cause wrong report; 3) by the restriction of equipment cun chi, helpless to the detection of large ferromagnetic parts.
Summary of the invention
For the deficiency of existing checkout equipment, propose a kind of novel ferromagnetic material detection device.
The technological means that the present invention adopts is as follows:
A kind of novel ferromagnetic material detection device, comprise beam, magnetic patch and the fixture being positioned at two ends, described beam left and right, the middle part of the lower surface of described beam is provided with foil gauge, described magnetic patch is suspended in the middle part of the upper surface of described beam by boss, namely described magnetic patch only contacts with described boss and do not contact with the upper surface of described beam.The object arranging described boss prevents described beam from becoming non-uniform beam by uniform beam.
Hingedly between described beam with described fixture to be connected.
Described strain gauge adhesion is at the middle part of the lower surface of described beam.
Described boss is fixedly connected with the middle part of the lower surface of described magnetic patch, and is fixedly connected with the middle part of the upper surface of described beam.
The present invention also discloses a kind of ferromagnetic parts detection method using above-mentioned novel ferromagnetic material detection device, has following steps:
S1, ferromagnetic material detection device novel described at least one is placed in below conveying belt, the length direction of described beam is perpendicular to the transmission direction of described conveying belt, the upper surface of described magnetic patch is D to the distance of the lower surface of described conveying belt, and the numerical value of described D should meet in testing process the lower surface contact friction preventing the upper surface of described magnetic patch and described conveying belt;
S2, by the strain value ε of described foil gauge
zbe demarcated as 0, ε
zfor described foil gauge is along the strain value on described beam length direction;
S3, after described conveying belt starts, record the strain value of described foil gauge, and the strain value in each strain variation cycle is obtained strain variation curve by curve, wherein, the ordinate of strain variation curve is strain value, the horizontal ordinate of strain variation curve be on described conveying belt ferromagnetic parts to the distance of center on mass transport direction of described magnetic patch, because ferromagnetic parts is in the process near described magnetic patch extremely away from described magnetic patch, the strain value of described foil gauge can change from small to big from large to small again, therefore, the strain value of what the described strain variation cycle referred to is exactly described foil gauge changes from small to big periodic process from large to small again,
S4, strain change curve is carried out to first derivation and obtains strain variation rate curve, wherein, the ordinate of strain variation rate curve is strain value rate of change, the horizontal ordinate of strain variation rate curve be on described conveying belt ferromagnetic parts to the distance of center on mass transport direction of described magnetic patch;
S5, find the horizontal ordinate X corresponding to maximal value of strain variation rate from strain variation rate curve
maxwith the horizontal ordinate X corresponding to the minimum value of strain variation rate
min, then the ferromagnetic parts that this strain variation rate curve is corresponding is of a size of X along on throughput direction
survey=| X
min-X
max|;
S6, find the maximal value of strain variation rate from the strain variation rate curve that each strain variation cycle is corresponding, the set obtaining the maximal value of strain variation rate is
according to
the principle that larger corresponding ferromagnetic parts size is larger, judges
corresponding ferromagnetic parts relative size, wherein,
be the maximal value of strain variation rate corresponding to i-th strain variation cycle, if namely
then
the size of corresponding ferromagnetic parts is greater than
the size of corresponding ferromagnetic parts.
Described at least one, novel ferromagnetic material detection device is placed in below described conveying belt in the form of an array.
Described foil gauge is connected with bridge measuring circuit.
Principle of the present invention is: by described beam, and the gravity of described boss and described foil gauge is designated as G
beam, and equivalence becomes centre-point load.By the gravity G of described magnetic patch
magneticwith the magnetic force F of ferromagnetic parts through out-of-date generation
magnetic forceall be equivalent to centre-point load, and try to achieve the suffered F that makes a concerted effort of described beam
close=F
magnetic force-G
beam-G
magnetic, as shown in Figure 1, described ε
zmeet formula
Wherein, ε
zfor described foil gauge is along the strain value on described beam length direction, L
beam, W
beamand H
beambe respectively length and width and the height of described beam, E represents the elastic modulus of described beam, and Z represents that strain measurement point is to the distance of hinge support, passes through formula
known, when
time, described ε
zmaximum, therefore, selected
position be strain measurement position of the present invention, the i.e. paste position of described foil gauge.
When on described conveying belt without Ferromagnetism Impurity through out-of-date, described beam is because being subject to G
beamand G
magneticeffect occur Fig. 2 distortion, at this moment will
the strain value ε of the described foil gauge at place
zbe demarcated as 0.As the strain value ε of foil gauge described in a certain moment
z> 0, shows that inventing described novel ferromagnetic material detection device herein detects ferromagnetic parts.Because when ferromagnetic parts is near described magnetic patch, make a concerted effort to change suffered by described beam, by F
close 1=-G
beam-G
magneticbecome F
close 2=F
magnetic force-G
beam-G
magnetic, the strain value of described foil gauge with the change of making a concerted effort by ε
z=0 becomes ε
z> 0.
Therefore, when the strain value of described foil gauge is 0, i.e. ε
z=0, then on described conveying belt without ferromagnetic parts; When the strain value of described foil gauge is greater than 0, i.e. ε
z> 0, then described conveying belt has ferromagnetic parts.
Compared with prior art, detection changes of magnetic field amount is converted to detection dependent variable by the present invention, according to changing value and the rate of change of strain, detect on conveying belt and whether there is ferromagnetic parts, if there is ferromagnetic parts, provide ferromagnetic parts along the size on mass transport direction, and the relative size of ferromagnetic parts corresponding to judging according to the maximal value of strain variation rate corresponding to each strain variation cycle.
The present invention extensively can promote in fields such as metal detection for the foregoing reasons.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is novel ferromagnetic material detection device schematic diagram of the present invention.
Fig. 2 is that the beam of novel ferromagnetic material detection device of the present invention is only subject to G
beamand G
magneticeffect time the schematic diagram that deforms.
Fig. 3 is the space structure schematic diagram of novel ferromagnetic material detection device in the specific embodiment of the present invention.
Fig. 4 is the structural representation of novel ferromagnetic material detection device in the specific embodiment of the present invention.
Fig. 5 is the side view of Fig. 4.
Fig. 6 is the vertical view of Fig. 4.
Fig. 7 is side view when novel ferromagnetic material detection device is placed in below conveying belt in the specific embodiment of the present invention.
Fig. 8 is vertical view when novel ferromagnetic material detection device is placed in below conveying belt in the specific embodiment of the present invention.
Fig. 9 is front view when novel ferromagnetic material detection device is placed in below conveying belt in the specific embodiment of the present invention
Figure 10 is the strain variation curve map of the ferromagnetic parts that in the specific embodiment of the present invention, first detects.
Figure 11 is the strain variation rate curve figure of the ferromagnetic parts that in the specific embodiment of the present invention, first detects.
Figure 12 is the strain variation curve map of the ferromagnetic parts that in the specific embodiment of the present invention, second detects.
Figure 13 is the strain variation rate curve figure of the ferromagnetic parts that in the specific embodiment of the present invention, second detects.
Wherein, in Figure 10 and Figure 12, ordinate is strain value, and horizontal ordinate is ferromagnetic parts that conveying belt 6 the detects distance of center on mass transport direction to magnetic patch 2, and unit is m; In Figure 11 and Figure 13, ordinate is strain value rate of change, and horizontal ordinate is ferromagnetic parts that conveying belt 6 the detects distance of center on mass transport direction to magnetic patch 2, and unit is m.
Embodiment
As shown in Fig. 3-Figure 13, a kind of novel ferromagnetic material detection device, comprises beam 1, magnetic patch 2 and the fixture 3 being positioned at described beam about 1 two ends, the middle part of the lower surface of described beam 1 is provided with foil gauge 4, and described magnetic patch 2 is suspended in the middle part of the upper surface of described beam 1 by boss 5.
Hingedly between described beam 1 with described fixture 3 to be connected.
Described foil gauge 4 is pasted onto the middle part of the lower surface of described beam 1.
Described boss 5 is fixedly connected with the middle part of the lower surface of described magnetic patch 2, and is fixedly connected with the middle part of the upper surface of described beam 1.
Use ferromagnetic parts 7 detection method for described novel ferromagnetic material detection device, there are following steps:
S1, be placed in below conveying belt 6 by described novel ferromagnetic material detection device, the length direction of described beam 1 is perpendicular to the transmission direction of described conveying belt 6, and the upper surface of described magnetic patch 2 is D to the distance of the lower surface of described conveying belt 6;
S2, by the strain value ε of described foil gauge 4
zbe demarcated as 0;
S3, after described conveying belt 6 starts, record the strain value of described foil gauge 4, and the strain value in each strain variation cycle is obtained strain variation curve by curve, wherein, the ordinate of strain variation curve is strain value, the horizontal ordinate of strain variation curve be on described conveying belt 6 ferromagnetic parts to the distance of center on mass transport direction of described magnetic patch 2, unit is m, in the present embodiment, one has two strain variation cycles, the i.e. strain variation cycle of first ferromagnetic parts detected and the strain variation cycle of second ferromagnetic parts detected, corresponding strain variation curve is the strain variation curve of the ferromagnetic parts that first detects and the strain variation curve of second ferromagnetic parts detected,
S4, respectively first derivation is carried out to two strain variation curves and obtain two strain variation rate curves, the i.e. strain variation rate curve of first ferromagnetic parts detected and the strain variation rate curve of second ferromagnetic parts detected, wherein, the ordinate of strain variation rate curve is strain variation rate, the horizontal ordinate of strain variation rate curve is that on described conveying belt 6, ferromagnetic parts is to the distance of center on mass transport direction of described magnetic patch 2, and unit is m;
S5, find the horizontal ordinate X corresponding to maximal value of strain variation rate from strain variation rate curve
maxwith the horizontal ordinate X corresponding to the minimum value of strain variation rate
min, then the ferromagnetic parts 7 that this strain variation rate curve is corresponding is of a size of X along on throughput direction
survey=| X
min-X
max|, in the present embodiment, the horizontal ordinate corresponding to maximal value of first ferromagnetic parts strain variation rate detected is-0.07m, the horizontal ordinate corresponding to minimum value of first ferromagnetic parts strain variation rate detected is 0.07m, the ferromagnetic parts 7 that then first ferromagnetic parts strain variation rate curve detected is corresponding is of a size of 0.14m along on throughput direction
The horizontal ordinate corresponding to maximal value of second ferromagnetic parts strain variation rate detected is-0.09m, the horizontal ordinate corresponding to minimum value of second ferromagnetic parts strain variation rate detected is 0.09m, then the ferromagnetic parts 7 that second ferromagnetic parts strain variation rate curve detected is corresponding is of a size of 0.18m along on mass transport direction;
S6, maximal value from strain variation rate corresponding to each strain variation cycle, the set obtaining the maximal value of strain variation rate is
according to
the principle that larger corresponding ferromagnetic parts 7 size is larger, judges
corresponding ferromagnetic parts 7 relative size, wherein,
be the maximal value of strain variation rate corresponding to i-th strain variation cycle, in the present embodiment, the maximal value of first ferromagnetic parts strain variation rate detected is 1.8 × 10
-3, the maximal value of second ferromagnetic parts strain variation rate detected is 2.1 × 10
-3, then the size of first ferromagnetic parts 7 corresponding to ferromagnetic parts strain variation rate curve detected is less than the size of the ferromagnetic parts 7 corresponding to ferromagnetic parts strain variation rate curve that second detects.
Described foil gauge 4 is connected with bridge measuring circuit.
Described fixture 3 is also provided with the through hole 8 for fixing described fixture 3.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (7)
1. a novel ferromagnetic material detection device, is characterized in that: comprise beam, and magnetic patch and the fixture being positioned at two ends, described beam left and right, the middle part of the lower surface of described beam is provided with foil gauge, and described magnetic patch is suspended in the middle part of the upper surface of described beam by boss.
2. novel ferromagnetic material detection device according to claim 1, is characterized in that: hingedly between described beam with described fixture be connected.
3. novel ferromagnetic material detection device according to claim 1, is characterized in that: described strain gauge adhesion is at the middle part of the lower surface of described beam.
4. novel ferromagnetic material detection device according to claim 1, is characterized in that: described boss is fixedly connected with the middle part of the lower surface of described magnetic patch, and is fixedly connected with the middle part of the upper surface of described beam.
5. use a ferromagnetic parts detection method for the novel ferromagnetic material detection device described in the arbitrary claim of claim 1-4, it is characterized in that there are following steps:
S1, be placed in below conveying belt by ferromagnetic material detection device novel described at least one, the length direction of described beam is perpendicular to the transmission direction of described conveying belt, and the upper surface of described magnetic patch is D to the distance of the lower surface of described conveying belt;
S2, by the strain value ε of described foil gauge
zbe demarcated as 0;
After S3, described conveying belt start, record the strain value of described foil gauge, and the strain value in each strain variation cycle is obtained strain variation curve by curve, wherein, the ordinate of strain variation curve is strain value, the horizontal ordinate of strain variation curve be on described conveying belt ferromagnetic parts to the distance of center on mass transport direction of described magnetic patch;
S4, strain change curve is carried out to first derivation and obtains strain variation rate curve, wherein, the ordinate of strain variation rate curve is strain variation rate, the horizontal ordinate of strain variation rate curve be on described conveying belt ferromagnetic parts to the distance of center on mass transport direction of described magnetic patch;
S5, find the horizontal ordinate X corresponding to maximal value of strain variation rate from strain variation rate curve
maxwith the horizontal ordinate X corresponding to the minimum value of strain variation rate
min, then the ferromagnetic parts that this strain variation rate curve is corresponding is of a size of X along on throughput direction
survey=| X
min-X
max|;
S6, find the maximal value of strain variation rate from the strain variation rate curve that each strain variation cycle is corresponding, the set obtaining the maximal value of strain variation rate is
according to
the principle that larger corresponding ferromagnetic parts size is larger, judges
corresponding ferromagnetic parts relative size, wherein,
it is the maximal value of strain variation rate corresponding to i-th strain variation cycle.
6. method according to claim 5, is characterized in that: described at least one, novel ferromagnetic material detection device is placed in below described conveying belt in the form of an array.
7. method according to claim 5, is characterized in that: described foil gauge is connected with bridge measuring circuit.
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|---|---|---|---|
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| CN108195927A (en) * | 2017-12-22 | 2018-06-22 | 北京工业大学 | Nonferromugnetic material impurity non-destructive testing sensor based on magnetic susceptibility measurement principle |
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