CN103743814A - Vibrating screen crossbeam fault detection device and method - Google Patents
Vibrating screen crossbeam fault detection device and method Download PDFInfo
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- CN103743814A CN103743814A CN201410020563.7A CN201410020563A CN103743814A CN 103743814 A CN103743814 A CN 103743814A CN 201410020563 A CN201410020563 A CN 201410020563A CN 103743814 A CN103743814 A CN 103743814A
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Abstract
The invention relates to a vibrating screen crossbeam fault detection device and method. The device comprises a low-frequency eddy current testing host, wherein a CPU (Central Processing Unit) is arranged in the low-frequency eddy current testing host; the CPU is connected with a signal generation module, a probe interface, a signal output module, an amplifier module, a phase sensitive detector, a filtering module, a phase rotator, an amplitude regulator, an A/D (Analog/Digital) conversion module, an impedance display screen, a loudspeaker, a storage device, an operation keyboard and a data charging interface; a probe device is inserted into the probe interface. The device has the beneficial effects that a method for detecting vibrating screen crossbeam fatigue cracks by using low-frequency eddy current is different from conventional eddy current, the low-frequency eddy current can penetrate through a coating layer so as to detect the crossbeam cracks, the device is low in cost, high in speed, and good in quantification and is used for early warning and nondestructive quantitative detection on vibrating screen fatigue crack faults, the detection result is reliable, and unscheduled shutdown caused by the faults is reduced, so that the economic loss is reduced, and economic benefits and social benefits are huge.
Description
Technical field
The present invention relates to a kind of vibratory screening apparatus crossbeam failure detector and detection method.
Background technology
Vibratory screening apparatus is to utilize the vibration characteristics of sieve nest to complete a kind of vibrating mechanical equipment to techniques such as the sorting of material, classification, de-mediated and dehydrations, is widely used in the occasions such as metallurgy, coal, mine, water conservancy and building materials.Take vibration screen for mineral as example, vibration screen for mineral is used for raw coal carry out classification, medium recovery, dehydration and remove discarded object etc.Vibratory screening apparatus is one of crucial equipment during coal separation is produced; because crossbeam is one of vibration screen for mineral key components and parts; play a part to support and protection; and in the course of work, due to crossbeam, bear for a long time the effect of screening materials carrying gravity, impulsive force and alternation exciting force; so fracture of girder is recurrent fault in actual production, and its safe operation is extremely important to colliery washing safety in production.
Existing vibratory screening apparatus crossbeam failure detector, can not penetrate clad and crossbeam crackle be detected, moulding heaviness, and troublesome poeration, production cost is high, detection speed is slow, the not accurate enough shortcomings that waits of testing result.
Summary of the invention
For the weak point existing in the problems referred to above, the invention provides a kind of vibratory screening apparatus crossbeam failure detector and detection method.
For achieving the above object, the invention provides a kind of vibratory screening apparatus crossbeam failure detector and detection method, comprise low frequency EDDY CURRENT main frame, low frequency EDDY CURRENT main frame inside is provided with CPU, described CPU is connected with signal generating module, probe interface, signal output module, amplification module, phase-sensitive detector (PSD), filtration module, phase rotation device, amplitude regulator, A/D modular converter, impedance display screen, loudspeaker, storer, operation keyboard and data charging inlet, on described probe interface, is inserted with probe apparatus.
Further, described signal generating module is connected with probe interface, this probe interface is connected with signal output module, this signal output module is connected with amplification module, amplification module connects phase-sensitive detector (PSD), and phase-sensitive detector (PSD) is connected with filtration module, and this filtration module is connected with phase rotation device, phase rotation device is connected with amplitude regulator, and amplitude regulator connects A/D modular converter.
Further, probe apparatus comprises skeleton, is wound with coil on skeleton, between coil and shell, is provided with filling material, and probe wire is installed on shell.
A detection method for vibratory screening apparatus crossbeam failure detector, this method of operating comprises the following steps:
Step 1: signal generating module is to probe transmitted signal;
Step 2: probe is sent to phase-sensitive detector (PSD) by the signal detecting;
Step 3: phase-sensitive detector (PSD) is transmitting phase rotation device by signal;
Step 4: phase rotation device is sent to A/D modular converter by the signal of conversion.
Further, in step 1, signal generating module produces waveform and F1, F2 occurs and send probe to by probe interface.
Further, in step 2, the shell of probe is close to the rubber adhesive surface of crossbeam and carries out scanning back and forth, when the information that probe coil picks up fatigue crack, information exchange is crossed probe wire and is transferred in low frequency eddy current low frequency EDDY CURRENT main frame and enters in phase-sensitive detector (PSD) by signal output module and amplification module.
Further, in step 3, the signal of phase-sensitive detector (PSD) enters phase rotation device by balance filtering.
Further, in step 4, phase rotation device is changed signal, and the signal after conversion is passed the signal to A/D modular converter and converted signal to data by amplitude regulator and is sent to CPU.
Beneficial effect of the present invention is: the method for using low frequency EDDY CURRENT vibratory screening apparatus crossbeam fatigue crack, different from conventional eddy current, low frequency eddy current can penetrate clad crossbeam crackle to be detected, not only cost is low, speed soon, quantitatively good, and testing result is reliable, for early warning and the harmless quantitative of vibratory screening apparatus fatigue crack fault, detect, reduce the unplanned property causing because of fault and stop production, thereby reduction economic loss, economic benefit and social benefit are huge.
Accompanying drawing explanation
Fig. 1 is the use constitutional diagram of a kind of vibratory screening apparatus crossbeam of the present invention failure detector;
Fig. 2 is a kind of vibratory screening apparatus crossbeam of the present invention failure detector sonde configuration schematic diagram;
Fig. 3 is a kind of vibratory screening apparatus crossbeam of the present invention failure detector low frequency EDDY CURRENT main machine structure block diagram;
Fig. 4 is a kind of vibratory screening apparatus crossbeam of the present invention failure detector detection method process flow diagram.
In figure: 1, crossbeam; 2, rubber adhesive; 3, fatigue crack; 4, low frequency EDDY CURRENT main frame; 5, probe wire; 6, shell; 7, filling material; 8, skeleton; 9, coil.
Embodiment
As Figure 1-4, a kind of vibratory screening apparatus crossbeam failure detector and detection method described in the embodiment of the present invention, comprise low frequency EDDY CURRENT main frame 4, low frequency EDDY CURRENT main frame 4 inside are provided with CPU, described CPU is connected with signal generating module, probe interface, signal output module, amplification module, phase-sensitive detector (PSD), filtration module, phase rotation device, amplitude regulator, A/D modular converter, impedance display screen, loudspeaker, storer, operation keyboard and data charging inlet, on described probe interface, is inserted with probe apparatus.Described signal generating module is connected with probe interface, this probe interface is connected with signal output module, this signal output module is connected with amplification module, amplification module connects phase-sensitive detector (PSD), phase-sensitive detector (PSD) is connected with filtration module, this filtration module is connected with phase rotation device, and phase rotation device is connected with amplitude regulator, and amplitude regulator connects A/D modular converter.Probe apparatus comprises skeleton 8, is wound with coil 9 on skeleton 8, between coil 9 and shell 6, is provided with filling material 7, and probe wire 5 is installed on shell 6.
A detection method for vibratory screening apparatus crossbeam failure detector, this method of operating comprises the following steps:
Step 1: signal generating module is to probe transmitted signal;
Step 2: probe is sent to phase-sensitive detector (PSD) by the signal detecting;
Step 3: phase-sensitive detector (PSD) is transmitting phase rotation device by signal;
Step 4: phase rotation device is sent to A/D modular converter by the signal of conversion.
In step 1, signal generating module produces waveform and F1, F2 occurs and send probe to by probe interface.
In step 2, the shell of probe is close to the rubber adhesive surface of crossbeam and carries out scanning back and forth, when the information that probe coil picks up fatigue crack, information exchange is crossed probe wire and is transferred in low frequency eddy current low frequency EDDY CURRENT main frame and enters in phase-sensitive detector (PSD) by signal output module and amplification module.
In step 3, the signal of phase-sensitive detector (PSD) enters phase rotation device by balance filtering.
In step 4, phase rotation device is changed signal, and the signal after conversion is passed the signal to A/D modular converter and converted signal to data by amplitude regulator and is sent to CPU.
As Fig. 1 crossbeam 1 outer wall is enclosed with rubber adhesive 2, the detection probe of low frequency EDDY CURRENT main frame 4 is close to rubber adhesive 2 outside surfaces, when crossbeam fatigue crack 3 being detected, the low frequency EDDY CURRENT main frame of low frequency EDDY CURRENT main frame 4 can be reported to the police, and can judge crackle size by amplitude and the phase place of detection signal.
Be illustrated in figure 2 low frequency eddy current probe structural representation, coil 9 is wound on skeleton 8, coil 9 is fixed on shell 6 by filling material 7, operating personnel can hand-held housing 6 detect, when coil 9 picks up eddy current signal, by probe wire 5, pass to instrument low frequency EDDY CURRENT main frame, thus the corresponding analysis of settling signal.
Be illustrated in figure 3 low frequency eddy detection system schematic diagram, during detection, use two different frequencies (F1, F2) to encourage magnetic test coil simultaneously, according to different frequency, different parameters is changed to the detection signal obtaining different, by real-time mixing, carry out the overall treatments such as vector addition subtracts and extract desired signal, suppress undesired signal, arrive the object of " eliminating the false and retaining the true ".Pumping signal is after adjustable gain power amplifier, by detection probe, pick up the low frequency eddy current signal feeding back again after preposition amplification phase sensitive detection, balance filtering, phase rotating and adjustable gain amplification processor, then enter data mixing unit, through A/D interface, send into computer system, by input/output module, carry out associative operation.
During concrete use: regulate corresponding detected parameters before detection, scanning is back and forth carried out on rubber adhesive 2 surfaces that make probing shell 6 be close to crossbeam 1 during detection, the information of picking up fatigue crack 3 when probe coil 9, by probe wire 5, be transferred in low frequency eddy current low frequency EDDY CURRENT main frame, signal is through preposition amplification phase sensitive detection, balance filtering, after phase rotating and adjustable gain amplification processor, then enter data mixing unit, through A/D interface, send into computer system, by input/output module, observe corresponding waveform, by the analysis mobile position of popping one's head in, judge the position of crackle, amplitude by analyzing and testing waveform and phase place judge the size of crackle, thereby realize the location and relative quantity of fatigue crack 3 in crossbeam 1.
Only as described above, be only preferred embodiment of the present invention, such as professional who are familiar with this art.After understanding technological means of the present invention, natural energy, according to actual needs, is changed under instruction of the present invention.Therefore all equal variation and modifications of doing according to the present patent application the scope of the claims, once should still remain within the scope of the patent.
Claims (8)
1. a vibratory screening apparatus crossbeam failure detector, comprise low frequency EDDY CURRENT main frame (4), low frequency EDDY CURRENT main frame (4) inside is provided with CPU, it is characterized in that: described CPU is connected with signal generating module, probe interface, signal output module, amplification module, phase-sensitive detector (PSD), filtration module, phase rotation device, amplitude regulator, A/D modular converter, impedance display screen, loudspeaker, storer, operation keyboard and data charging inlet, on described probe interface, is inserted with probe apparatus.
2. vibratory screening apparatus crossbeam failure detector according to claim 1, it is characterized in that: described signal generating module is connected with probe interface, this probe interface is connected with signal output module, this signal output module is connected with amplification module, amplification module connects phase-sensitive detector (PSD), and phase-sensitive detector (PSD) is connected with filtration module, and this filtration module is connected with phase rotation device, phase rotation device is connected with amplitude regulator, and amplitude regulator connects A/D modular converter.
3. vibratory screening apparatus crossbeam failure detector according to claim 1, it is characterized in that: probe apparatus comprises skeleton (8), on skeleton (8), be wound with coil (9), between coil (9) and shell (6), be provided with filling material (7), probe wire (5) is installed on shell (6).
4. a detection method for vibratory screening apparatus crossbeam failure detector, is characterized in that: this method of operating comprises the following steps:
Step 1: signal generating module is to probe transmitted signal;
Step 2: probe is sent to phase-sensitive detector (PSD) by the signal detecting;
Step 3: phase-sensitive detector (PSD) is transmitting phase rotation device by signal;
Step 4: phase rotation device is sent to A/D modular converter by the signal of conversion.
5. the detection method of vibratory screening apparatus crossbeam failure detector according to claim 4, is characterized in that: in step 1, signal generating module produces waveform and F1, F2 occurs and send probe to by probe interface.
6. the detection method of vibratory screening apparatus crossbeam failure detector according to claim 4, it is characterized in that: in step 2, the shell of probe is close to the rubber adhesive surface of crossbeam and carries out scanning back and forth, when the information that probe coil picks up fatigue crack, information exchange is crossed probe wire and is transferred in low frequency eddy current low frequency EDDY CURRENT main frame and enters in phase-sensitive detector (PSD) by signal output module and amplification module.
7. the detection method of vibratory screening apparatus crossbeam failure detector according to claim 4, is characterized in that: in step 3, the signal of phase-sensitive detector (PSD) enters phase rotation device by balance filtering.
8. the detection method of vibratory screening apparatus crossbeam failure detector according to claim 4, it is characterized in that: in step 4, phase rotation device is changed signal, and the signal after conversion is passed the signal to A/D modular converter and converted signal to data by amplitude regulator and is sent to CPU.
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| CN201410020563.7A CN103743814A (en) | 2014-01-16 | 2014-01-16 | Vibrating screen crossbeam fault detection device and method |
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| CN201410020563.7A CN103743814A (en) | 2014-01-16 | 2014-01-16 | Vibrating screen crossbeam fault detection device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849345A (en) * | 2015-04-24 | 2015-08-19 | 中国矿业大学 | Pulsed eddy current detection device for mine vibrating screen beam fatigue cracks |
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| JPH10325829A (en) * | 1997-05-22 | 1998-12-08 | Daido Steel Co Ltd | Eddy current flaw detector |
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| CN203672836U (en) * | 2014-01-16 | 2014-06-25 | 北京工业大学 | Failure detection device forgirderof vibrating screen |
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2014
- 2014-01-16 CN CN201410020563.7A patent/CN103743814A/en active Pending
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| JPH10325829A (en) * | 1997-05-22 | 1998-12-08 | Daido Steel Co Ltd | Eddy current flaw detector |
| CN1815216A (en) * | 2005-01-31 | 2006-08-09 | 林俊明 | Method and device for rapid determining metal content in ore powder |
| CN102004129A (en) * | 2010-12-13 | 2011-04-06 | 山东哈大电气有限公司 | On-line vortex flaw detecting system |
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| CN103163215A (en) * | 2012-11-30 | 2013-06-19 | 中国矿业大学 | Pulse eddy current detection method and device of fatigue crack of vibrating screen for large mine |
| CN203672836U (en) * | 2014-01-16 | 2014-06-25 | 北京工业大学 | Failure detection device forgirderof vibrating screen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849345A (en) * | 2015-04-24 | 2015-08-19 | 中国矿业大学 | Pulsed eddy current detection device for mine vibrating screen beam fatigue cracks |
| CN104849345B (en) * | 2015-04-24 | 2017-12-19 | 中国矿业大学 | A kind of Pulsed eddy current testing device of vibration screen for mineral crossbeam fatigue crack |
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Application publication date: 20140423 |