CN102121998B - Metal detection method for steel wire core conveyor belt - Google Patents
Metal detection method for steel wire core conveyor belt Download PDFInfo
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- CN102121998B CN102121998B CN 201010022596 CN201010022596A CN102121998B CN 102121998 B CN102121998 B CN 102121998B CN 201010022596 CN201010022596 CN 201010022596 CN 201010022596 A CN201010022596 A CN 201010022596A CN 102121998 B CN102121998 B CN 102121998B
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Abstract
The invention relates to the metal detection field of conveyor belts, in particular to a metal detection method for a steel wire core conveyor belt, comprising the following steps of: step 1, obtaining an oscillation working current parameter lnD of a metal detection coil of the steel wire core belt in a normal section; step 2, obtaining the oscillation working current parameter lntD of the metal detection coil of the steel wire core belt in a belt joint section; step 3, collecting signals by a Hall magnetically sensitive detection device and sending the signals into a signal processing control device; step 4, transferring, by the signal processing control device, corresponding comparison parameters lnD or lntD according to the signals sent by the Hall magnetically sensitive detection device; and step 5, collecting an actual working current signal lsD by the metal detection coil, comparing to judge whether the material conveyed on the steel wire core belt contains metal elements or not. The metal detection coil can still achieve metal detection in the joint range of the steel wire core belt; the detection is more accurate without missing detection.
Description
Technical field
The present invention relates to travelling belt metal detection field, relate in particular to a kind of wire-core travelling belt metal detection method.
Background technology
Travelling belt metal detection technology is to adopt magnetic test coil of device on travelling belt, pass through the alternation oscillating current in magnetic test coil, produce eddy current in steel and iron parts when having steel and iron parts to pass in magnetic test coil, thereby cause the alternation oscillating current loss in magnetic test coil, testing circuit carries out by the testing result to the sudden change of current loss amount the judgement that has or not steel and iron parts to exist on the travelling belt workplace.Existing travelling belt metal detection technology is a kind of technology that adopts transient detection, and this detection technique can only do to have or not the qualitative judgement of steel and iron parts existence to a certain extent.And there is a large amount of metal wire rope wire-core travelling belt inside own, and these wire rope itself just have metallic character, detect extra ironware and utilize prior art to have very large difficulty on the wire-core travelling belt.Particularly the wire-core travelling belt all uses the band conveyor occasion in large load, high-speed, long haul distance, the unit active length is all long, the wire-core travelling belt generally has a lot of joints like this, and these belt lacing have brought very large difficulty also for the metal detection of wire-core travelling belt.
A kind of technology that is used for the wire-core travelling belt after adopting non-wire-core travelling belt metal detection technology to be transformed is arranged now, although this metal detection device has been done special improvement to being used in wire-core belt occasion, this metal detection device uses a lot of problem that still exists on the wire-core belt.Its apparatus structure is arranged signal as shown in Figure 1, its basic functional principle is: arrange a metal detection coil 2 on wire-core belt 1, traffic direction along wire-core belt 1, in the place ahead of metal detection coil 2, what the reverse side of wire-core belt 1 was arranged a principle of work metalloid magnetic test coil 2 takes the lead magnetic test coil 4.At metal detection coil 2 and take the lead in magnetic test coil 4 by the alternation oscillating current, produce eddy current in steel and iron parts when having steel and iron parts to pass in magnetic test coil, thereby cause the alternation oscillating current loss in magnetic test coil, its wire-core with belt is similar to regards a constant continuous quantity as, and testing circuit filters by the adjusting of sensitivity the current loss variation that the other factors in coil causes.When passing through coil with the iron and steel foreign matter on wire-core belt 1, alternation oscillating current loss meeting in coil increases suddenly, can produce a voltage jump in signal processing circuit this moment in the back, if just thinking during the scope that this jump signal is set greater than adjustment of sensitivity has the iron and steel foreign matter to exist on wire-core belt 1, output circuit has been exported immediately iron and has been sneaked into signal.When belt lacing 3 being arranged through out-of-date, the overlapping steel wire part at belt lacing 3 places can first arrive takes the lead magnetic test coil 4, the alternation oscillating current loss meeting of taking the lead in magnetic test coil 4 increases suddenly, export belt lacing 3 this moment through signal, controller is just with output circuit locking a period of time, and having made iron sneak into signal can not export, when waiting for belt lacing 3 fully by metal detection coil 2, reopen output circuit, at this moment having iron to sneak into signal could normal output again.
Above-mentioned this pick-up unit is in real work or detection sensitivity is extremely low, the iron and steel foreign matter that needs to detect scale size can not be detected.Detect misoperation extremely many, normal the carrying out that produces of impact.If the iron and steel foreign matter of sneaking into just in time is in the traveling belt connector place, cause undetectedly because its output locking can not normally detect, will cause great threat to the normal operation of travelling belt.And the magnetic test coil principle of work of taking the lead that the belt lacing detection is adopted is similar to the plain metal pick-up unit, also to utilize ironware through producing the detection principle of eddy current, it does not exist together from the plain metal pick-up unit is only that installation site and method on travelling belt is different, be installed on a side lower part of belt, if talk about like the ironware on travelling belt and belt lacing class signal, also can be used as belt lacing to ironware and be missed, result of use is bad.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of metal detection method for steel wire core conveyor belt, this detection method adopts Hall magnetosensitive pick-up unit to determine the position of belt lacing, then choosing corresponding parameter compares, detect more accurate, and can undetected belt lacing the metal in zone.
The present invention is achieved in that a kind of metal detection method for steel wire core conveyor belt, at first, metal detection coil fixed and arranged, the wire-core belt passes the alternating magnetic field of metal detection coil, traffic direction along the wire-core belt, the place ahead at the metal detection coil, Hall magnetosensitive pick-up unit of the reverse side fixed and arranged of wire-core belt, and in each the place ahead, belt lacing junction of wire-core belt, imbed a permanent magnet by in a side belt interlayer of Hall magnetosensitive pick-up unit, comprise the following steps during detection:
Step 1, normal reach concussion working current parameter l during by the metal detection coil of obtaining the wire-core belt
nD, and send into signal processing control device;
Step 2, belt lacing section concussion working current parameter l during by the metal detection coil of obtaining the wire-core belt
ntD, and send into signal processing control device;
Send into signal processing control device after step 3, Hall magnetosensitive pick-up unit collection signal;
Step 4, signal processing control device are transferred corresponding reduced parameter l according to the signal that Hall magnetosensitive pick-up unit transmits
nDOr l
ntD
Step 5, metal detection coil gather actual working current signal l
sa, obtain l after the A/D change-over circuit converts digital quantity to
sD, then send into signal processing control device, with after parameter computing selected in step 4 and l
sDWhether compare, differentiating on the wire-core belt has metalwork to sneak in transported material.
Described signal processing control device comprises PC microprocessor, storer and timer.
Described step 1 is specially, operation wire-core belt, and when the normal reach of wire-core belt passed through the metal detection coil, metal detection signal processing and control module was with the metal detection coil concussion working current l that delivers to this moment
sa, obtain l after the A/D change-over circuit converts digital quantity to
nD, send into and be kept at l after signal processing control device is processed
nDIn value storage.
Described step 2 is specially, operation wire-core belt, when the belt lacing of wire-core belt pass through belt lacing pick-up unit top, Hall magnetosensitive pick-up unit sends the signal that belt lacing are about to arrive the metal detection coil, the belt lacing arriving signal is sent into signal processing control device, and metal detection signal processing and control module is with the metal detection coil concussion working current l that delivers to this moment
sa, obtain l after the A/D change-over circuit converts digital quantity to
ntD, send into and be kept at l after signal processing control device is processed
ntDIn value storage.
Described acquisition parameter l
ntDThe time, the time T that begins to gather
CKThe time T lasting with collection
CJDetermine according to the travelling speed of the position of the permanent magnet of burying underground in the wire-core belt and belt lacing and wire-core belt and the length of belt lacing;
T
CK=(L1+L3)/V; In formula, the vertical range that the permanent magnet burial place of L1=begins to the belt lacing section; L3=Hall magnetosensitive pick-up unit is to the distance of metal detection coil; The travelling speed of V=wire-core belt;
T
CJ=L2/V; In formula, the length of L2=belt lacing; The travelling speed of V=wire-core belt;
Be about to arriving signal when Hall magnetosensitive pick-up unit sends the belt lacing signal, begin to carry out T
CKThe time timing, T
CKTiming time arrives, and the metal detection coil that the PC microprocessor begins delivered to this moment shakes working current l
saValue after the A/D conversion gathers, and beginning T
CJThe time timing is until T
CJTiming time is got maximal value as l to finishing collection with the one group of numerical value that collects
ntDParameter value is sent into signal processing control device.
Described signal processing control device comprises PC microprocessor, storer and timer.
Whether the present invention detects belt lacing with Hall magnetosensitive pick-up unit and arrives, then data by recording in the PC microprocessor, choosing corresponding parameter controls and compares, within the time that belt lacing arrive, the metal detection coil still can carry out metal detection work, detect more accurately, can not occur undetected.
Description of drawings
Fig. 1 is existing metal detecting device for steel wire core conveyer belt schematic diagram;
Fig. 2 is the metal detecting device for steel wire core conveyer belt schematic diagram that the inventive method is used.
In figure: 1 wire-core belt, 2 metal detection coils, 3 belt lacing, 4 are taken the lead magnetic test coil, 5 permanent magnet, 6 Hall magnetosensitive pick-up units, 7 signal processing control devices.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's statement, these equivalent form of values fall within the application's appended claims limited range equally.
As shown in Figure 2, a kind of metal detecting device for steel wire core conveyer belt, at first, metal detection coil 2 fixed and arranged, wire-core belt 1 passes metal detection coil 2, along the traffic direction of wire-core belt 1, the place ahead at metal detection coil 2, Hall magnetosensitive pick-up unit 6 of the reverse side fixed and arranged of wire-core belt 1, and in each belt lacing of wire-core belt 13 the place aheads, junction, imbed a permanent magnet 5 by in a side belt interlayer of Hall magnetosensitive pick-up unit 6.Metal detection coil 2 and Hall magnetosensitive pick-up unit 6 all are connected to signal processing control device 7, control and processing signals, and described signal processing control device 7 comprises PC microprocessor, storer and timer.
By the alternation oscillating current, make metal detection coil 2 peripheries produce an alternating magnetic field in metal detection coil 2, wire-core belt 1 passes the alternating magnetic field of metal detection coil 2.The mode that wire-core belt 1 passes metal detection coil 2 alternating magnetic fields can have multiple, as: metal detection coil 2 can be placed in top or the below of wire-core belt 1, can be also that wire-core belt 1 directly passes metal detection coil 2; The embodiment of this case is that wire-core belt 1 directly passes metal detection coil 2.When the metal ironware passed from alternating magnetic field, alternating magnetic field can produce eddy current in ironware, thereby caused the alternation oscillating current loss in metal detection coil 2, and the size of eddy current loss causes the concussion working current l of metal detection coil
saRespective change occurs, the oscillatory work current value is sent in the A/D change-over circuit of PC microprocessor, through digital quantity corresponding with the oscillatory work current value of conversion generation of A/D change-over circuit, the arithmetical unit of sending into the PC microprocessor carries out calculation process.The band conveyor of long haul distance is all to be formed by connecting by several sections or tens of sections belts, generally every hundreds of rice, belt lacing 3 are just arranged, in order to guarantee that belt has certain stretching resistance, the interior independent wire strand core wire rope of belt cementation process regulation belt junction must be overlapping or be changed internal placement, and the belt coupling part is that belt lacing 3 generally have several meters long.When travelling belt moved, the belt direction of travel of travelling belt in Fig. 2 advanced from right to left, and permanent magnet 5 first passes through Hall magnetosensitive pick-up unit 6 in belt lacing 3 the place aheads according to permanent magnet 5, and the order through metal detection coil 2 after belt lacing 3 moves ahead.
Utilize a kind of metal detection method for steel wire core conveyor belt of above device, comprise the following steps:
Step 1, obtain wire-core belt 1 normal reach metal detection coil 2 concussion working current parameter l
nDBefore the work of travelling belt metal detection begins, the concussion working current parameter l when first wire-core belt 1 normal reach being passed through metal detection coil 2
nDGather memory, l
nDThe method that gathers memory is: the operation travelling belt, when belt normal reach process metal detection coil 2, metal detection signal processing and control module is with the metal detection coil concussion working current l that delivers to this moment
sa, obtain l after the A/D change-over circuit converts digital quantity to
nD, send into and be kept at l after the PC microprocessor is processed
nDIn value storage.
Step 2, the concussion working current parameter l when obtaining belt lacing 3 by metal detection coil 2
ntDBefore the work of travelling belt metal detection begins, first to the concussion working current parameter l of the metal detection coil 2 of belt lacing 3
ntGather memory, l
ntThe method that gathers memory is: operation wire-core belt 1, when the permanent magnet 5 before belt lacing 3 passes through Hall magnetosensitive pick-up unit 6 top, hall magnetic component detects the magnetic field of permanent magnet 5, Hall magnetosensitive pick-up unit 6 sends the signal that belt lacing 3 are about to arrive metal detection coil 2, deliver to the PC microprocessor, metal detection signal processing and control module is carried out l
ntDCarry out the preparation of data acquisition process.Controlled beginning and the end of acquisition time by the PC microprocessor; Gather start time T
CKDetermine: T
CK=(L1+L3)/V; In formula, permanent magnet 5 burial places of L1=are to the vertical range of belt lacing 3 beginning sections; L3=Hall magnetosensitive pick-up unit 6 is to the distance of metal detection coil 2; The travelling speed of V=wire-core belt 1; Gather concluding time T
CJDetermine: T
CJ=L2/V; In formula, the length of L2=belt lacing 3; The travelling speed of V=wire-core belt 1; Be about to arriving signal when Hall magnetosensitive pick-up unit 6 sends belt lacing 3, the first timer begins to carry out T
CKThe time timing, T
CKTiming time arrives, and the metal detection coil that the PC microprocessor begins delivered to this moment shakes working current l
saValue after the A/D conversion gathers, and begins T by the second timer
CJThe time timing is until T
CJTiming time is got maximal value to finishing collection with the one group of numerical value that collects, and this numerical value is l
ntDParameter value, the PC microprocessor is kept at l with it
ntDIn value storage.
Send into signal processing control device after step 3, Hall magnetosensitive pick-up unit collection signal;
Step 4, signal processing control device are transferred corresponding reduced parameter l according to the signal that Hall magnetosensitive pick-up unit transmits
nDOr l
ntD
Step 5, belt conveyer bring into operation, the concussion working current l of metal detection coil 2
saDeliver to metal detection signal processing and control module, after the A/D change-over circuit converts digital quantity to, send the PC microprocessor to carry out calculation process.Hall magnetosensitive pick-up unit 6 signals are delivered to the PC microprocessor of signal processing control device and are processed.When carrying out the ironware detection, the concussion working current l of the continual collection metal detection of PC microprocessor coil 2
saValue l after the A/D conversion
sD, continual collection belt lacing 3 arriving signals of Hall magnetosensitive pick-up unit 6.Generally have following two kinds of situations:
Situation 1: Hall magnetosensitive pick-up unit 6 does not have belt lacing 3 arriving signals, the value l that the PC microprocessor will collect
sDWith l
kD+ (l
nD-l
kD) value of * k is greater than or less than and equals comparison, in formula: l
kD=l
kaValue after the A/D conversion; K=detects safety factor, span (1.1-2.0).Result treatment relatively: work as l
sD≤ l
kD+ (l
nD-l
kD) during * k, do not have metalwork to sneak on wire-core belt 1, signal processing control device is not exported " the iron signal is arranged ".Work as l
sDL
kD+ (l
nD-l
kD) during * k, have metalwork to sneak on wire-core belt 1, signal processing control device output " the iron signal is arranged ".In formula: l
sD=PC microprocessor Real-time Collection is to the concussion working current l of metal detection coil
saValue after the conversion of A/D digital quantity.
Situation 2: Hall magnetosensitive pick-up unit 6 has belt lacing 3 arriving signals, and the PC microprocessor continues the l that collects
sDValue and l
kD+ (l
nD-l
kD) value of * k compares computing, the result treatment after relatively: work as l
sD≤ l
kD+ (l
nD-l
kD) during * k, do not have metalwork to sneak on wire-core belt 1, signal processing control device is not exported " the iron signal is arranged ".Work as l
sDL
kD+ (l
nD-l
kD) during * k, have metalwork to sneak on wire-core belt 1, metal detection signal processing and control module output " the iron signal is arranged ".The PC microprocessor starts inner the first timer simultaneously, with belt lacing T 3 time of arrival
CKValue carry out timing, the first timer timing time arrives, and starts inner the second timer, passes through time T with belt lacing 3
CJValue carry out timing, the PC microprocessor is with the l that collects
sDValue and l
kD+ (l
ntD-l
kD) * k value compares computing.Result treatment relatively: work as l
kD≤ l
kD+ (l
ntD-l
kD) during * k, do not have metalwork to sneak on belt lacing 3, signal processing control device is not exported " the iron signal is arranged ".Work as l
kDL
kD+ (l
ntD-l
kD) during * k, have metalwork to sneak on belt lacing 3, signal processing control device output " the iron signal is arranged ".Until the T of the second timer
CJThe value timing time arrives, and proves that belt lacing 3 have left metal detection coil 2, and this moment, the PC microprocessor was with the l that collects
sDValue and l
kD+ (l
nD-l
kD) value of * k compares, and returns to the processing procedure of situation 1.Until next belt lacing 3 arrive, Hall magnetosensitive pick-up unit 6 has belt lacing 3 arriving signals, then the processing procedure of the situation of carrying out 2, and two kinds of duties like this loop, until belt conveyer stops.
l
kDConcussion running parameter when there is no metal in the metal detection coil.
Running parameter k, T in the present embodiment
CK, T
CJ, l
kD, l
nD, l
ntDDetermine and gather:
Detect safety factor k and get 1.1.
Start time T
CKDetermine: T
CK=(L1+L3)/V; In this example, L1=0.8 rice; L3=1 rice; The V=2 meter per second; T
CK=(0.8+1)/2=0.9 second.
Gather concluding time T
CJDetermine: T
CJ=L2/V; In this example, L2=2; The V=2 meter per second; T
CJ=2/2=1 second.
Concussion running parameter l when there is no metal in the metal detection coil
kDDetermine: the concussion running parameter l when there is no metal in the metal detection coil
kD, i.e. the zero load of metal detection coil concussion working current l
kaDigital quantity value after the A/D conversion obtains l through unloaded energising operation in the present embodiment
ka=2.700 mA obtain shaking running parameter l after the A/D conversion
kD=27000.
Belt normal reach metal detection coil concussion running parameter l
nDDetermine: move travelling belt in the present embodiment, when the belt normal reach during through the metal detection coil, the metal detection signal processing control device is with the concussion working current l of the metal detection coil delivered to
na=2.800mA, the PC microprocessor once gathers every 1 second belt normal reach metal detection coil concussion working current parameter, gathers altogether 20 data, after choosing maximal value, obtains l after the conversion of A/D digital quantity
nD=28000.After above-mentioned running parameter is determined and gathered, be kept in corresponding value storage after sending the PC microprocessor to process.
Belt lacing section metal detection coil concussion running parameter l
ntDCollection determine.Move travelling belt in the present embodiment, when the permanent magnet before belt lacing passes through belt lacing pick-up unit top, the belt lacing pick-up unit sends the signal that belt lacing are about to arrive the metal detection coil, delivers to the metal detection signal processing control device, and the PC microprocessor begins to carry out T
CKThe timing of=0.9 second when the timing time of 0.9 second finishes, begins to carry out T
CJThe timing of=1 second, the PC microprocessor begins to carry out belt lacing section metal detection coil concussion working current parameter was once gathered every 0.1 second simultaneously, finish to the timing time of 1 second, 10 data have been gathered altogether, through several belt lacing sections are carried out the data acquisition of aforesaid way, choose at last maximal value and obtain l
ntD=28600, PC microprocessor is kept at these data in corresponding value storage.
The detection of pick-up metal spare in transported material on the wire-core belt.Belt conveyer brings into operation when carrying out the ironware detection, the concussion working current value l of the continual collection metal detection of PC microprocessor coil
sa, the continual collection belt lacing of belt lacing pick-up unit arriving signal.Generally have following two kinds of situations:
State 1: the belt lacing pick-up unit does not have the belt lacing arriving signal, if this moment the PC microprocessor with the concussion working current value l of the metal detection coil that collects
sa=2.805mA, l after the conversion of A/D digital quantity
sDBe 28050 and l
kD+ (l
nD-l
kD) value of * k compares, the result after relatively: 28050＜27000+(28000-27000) * 1.1; l
sD＜l
kD+ (l
nD-l
kD) do not have metalwork to sneak on * k travelling belt, signal processing control device is not exported " the iron signal is arranged ".If this moment, the PC microprocessor was with the concussion working current value l of the metal detection coil that collects
sa=2.835mA is l after the digital quantity conversion
sDBe 28350, the result after relatively: 28350〉27000+(28000-27000) * 1.1; l
sDL
kD+ (l
nD-l
kD) have metalwork to sneak on * k travelling belt, signal processing control device output " the iron signal is arranged ".
State 2: the belt lacing pick-up unit has the belt lacing arriving signal, and the PC microprocessor receives this signal and begins to carry out T
CKThe timing of=0.9 second, and continue the concussion working current value l of the metal detection coil that will collect
sa, obtain l after the conversion of A/D digital quantity
sDWith l
kD+ (l
nD-l
kD) value of * k compares.Result treatment relatively is with state 1.When the PC microprocessor timing time of 0.9 second finishes, begin to carry out T
CJThe timing of=1 second, the simultaneously l that collects after with this time of PC microprocessor
sDBe converted to and l
kD+ (l
ntD-l
kD) value of * k compares.If this moment the metal detection coil concussion working current value l
sa=2.865mA, the l that the PC microprocessor collects after the conversion of A/D digital quantity
sD=28650, PC microprocessor is with 28650 and l
kD+ (l
ntD-l
kD) value of * k compares.Result relatively: 28650＜27000+(28600-27000) * 1.1; l
sD＜l
kD+ (l
ntD-l
kD) do not have metalwork to sneak on * k traveling belt connector, signal processing control device is not exported " the iron signal is arranged ".If this moment the metal detection coil concussion working current value l
sa=2.890mA, the l that the PC microprocessor collects after the conversion of A/D digital quantity
sD=28900, PC microprocessor is with 28900 and l
kD+ (l
ntD-l
kD) value of * k compares.Result relatively: 28900〉27000+(28600-27000) * 1.1; l
sDL
kD+ (l
ntD-l
kD) have metalwork to sneak on * k traveling belt connector, signal processing control device output " the iron signal is arranged ".Until T
CJThe timing time of=1 second arrives, and proves that belt lacing have left the metal detection coil, the l that after this PC microprocessor will collect
sDConvert back again and l
kD+ (l
nD-l
kD) value of * k compares, and returns to the processing procedure of state 1.Until next belt lacing arrive, the belt lacing pick-up unit has been sent to the belt lacing arriving signal, then carries out the processing procedure of state 2, and two kinds of duties like this loop, until belt conveyer stops.
Claims (5)
1. metal detection method for steel wire core conveyor belt, it is characterized in that, at first, metal detection coil (2) fixed and arranged, wire-core belt (1) passes the alternating magnetic field of metal detection coil (2), traffic direction along wire-core belt (1), the place ahead in metal detection coil (2), a Hall magnetosensitive pick-up unit of the reverse side fixed and arranged of wire-core belt (1) (6), and in each belt lacing of wire-core belt (1) (3) the place ahead, junction, imbed a permanent magnet (5) by in a side belt interlayer of Hall magnetosensitive pick-up unit (6), comprise the following steps during detection:
Step 1, normal reach concussion working current parameter l during by the metal detection coil of obtaining the wire-core belt
nD, and send into signal processing control device; PC microprocessor in signal processing control device once gathers every 1 second belt normal reach metal detection coil concussion working current parameter, gathers altogether 20 data, chooses maximal value, obtains l after the conversion of A/D digital quantity
nD
Step 2, belt lacing section concussion working current parameter l during by the metal detection coil of obtaining the wire-core belt
ntD, and send into signal processing control device; PC microprocessor in signal processing control device begins to carry out belt lacing section metal detection coil concussion working current parameter was once gathered every 0.1 second, 10 data have been gathered altogether, through several belt lacing sections are carried out the data acquisition of aforesaid way, choose at last maximal value, obtain l after the conversion of A/D digital quantity
ntD
Send into signal processing control device after step 3, Hall magnetosensitive pick-up unit collection signal;
Step 4, signal processing control device are transferred corresponding reduced parameter l according to the signal that Hall magnetosensitive pick-up unit transmits
nDOr l
ntD
Step 5, metal detection coil gather actual working current signal l
sa, obtain l after the A/D change-over circuit converts digital quantity to
sD, then send into signal processing control device, with after parameter computing selected in step 4 and l
sDWhether compare, differentiating on the wire-core belt has metalwork to sneak in transported material.
2. metal detection method for steel wire core conveyor belt as claimed in claim 1, it is characterized in that: described signal processing control device comprises PC microprocessor, storer and timer.
3. metal detection method for steel wire core conveyor belt as claimed in claim 1 or 2, it is characterized in that: described step 1 is specially, operation wire-core belt, when the normal reach of wire-core belt passed through the metal detection coil, metal detection signal processing and control module was with the metal detection coil concussion working current l that delivers to this moment
sa, obtain l after the A/D change-over circuit converts digital quantity to
nD, send into and be kept at l after signal processing control device is processed
nDIn value storage.
4. metal detection method for steel wire core conveyor belt as claimed in claim 1 or 2, it is characterized in that: described step 2 is specially, operation wire-core belt, when the belt lacing of wire-core belt pass through belt lacing pick-up unit top, Hall magnetosensitive pick-up unit sends the signal that belt lacing are about to arrive the metal detection coil, the belt lacing arriving signal is sent into signal processing control device, and metal detection signal processing and control module is with the metal detection coil concussion working current l that delivers to this moment
sa, obtain l after the A/D change-over circuit converts digital quantity to
ntD, send into and be kept at l after signal processing control device is processed
ntDIn value storage.
5. metal detection method for steel wire core conveyor belt as claimed in claim 4, it is characterized in that: in described step 2, the concrete operations of data acquisition are, the time T that begins to gather
CKThe time T lasting with collection
CJDetermine according to the position of the permanent magnet of burying underground in the wire-core belt and belt lacing and travelling speed and the belt lacing length of wire-core belt;
T
CK=(L1+L3)/V; In formula, the vertical range that the permanent magnet burial place of L1=begins to the belt lacing section; L3=Hall magnetosensitive pick-up unit is to the distance of metal detection coil; The travelling speed of V=wire-core belt;
T
CJ=L2/V; In formula, the length of L2=belt lacing; The travelling speed of V=wire-core belt;
Be about to arriving signal when Hall magnetosensitive pick-up unit sends the belt lacing signal, begin to carry out T
CKThe time timing, T
CKTiming time arrives, and the metal detection coil that the PC microprocessor begins delivered to this moment shakes working current l
saValue after the A/D conversion gathers, and beginning T
CJThe time timing is until T
CJTiming time is got maximal value as l to finishing collection with the one group of numerical value that collects
ntDParameter value is sent into signal processing control device.
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| CN 201010022596 CN102121998B (en) | 2010-01-08 | 2010-01-08 | Metal detection method for steel wire core conveyor belt |
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| CN 201010022596 CN102121998B (en) | 2010-01-08 | 2010-01-08 | Metal detection method for steel wire core conveyor belt |
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| CN102121998B true CN102121998B (en) | 2013-06-19 |
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| CN103245975B (en) * | 2012-02-08 | 2016-04-06 | 淮南矿业(集团)有限责任公司 | The pick-up unit of travelling belt metal coupling head and foreign substance detection system |
| CN105318895B (en) * | 2014-06-20 | 2019-04-23 | 宝山钢铁股份有限公司 | Steel wire lining conveyor belt belt lacing sensing device |
| CN105759314A (en) * | 2014-12-14 | 2016-07-13 | 哈尔滨市三和佳美科技发展有限公司 | Hall electromagnetic position detector |
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| CN102004266A (en) * | 2009-08-31 | 2011-04-06 | 宝山钢铁股份有限公司 | Metal detecting device for steel wire core conveyer belt |
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