CN102998364A - Audio spectrum detection system and method for internal crack of graphite product - Google Patents
Audio spectrum detection system and method for internal crack of graphite product Download PDFInfo
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- CN102998364A CN102998364A CN2012104716702A CN201210471670A CN102998364A CN 102998364 A CN102998364 A CN 102998364A CN 2012104716702 A CN2012104716702 A CN 2012104716702A CN 201210471670 A CN201210471670 A CN 201210471670A CN 102998364 A CN102998364 A CN 102998364A
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Abstract
The invention discloses an audio spectrum detection system and an audio spectrum detection method for an internal crack of a graphite product. The detection system comprises a detection box (3), a transmission platform (2), a servo knocking unit, a voice frequency collector (10), a voice frequency spectrum processing unit (8) and a control panel (1), wherein the transmission platform (2) comprises a guide rail (4) and a tray (5) arranged on the guide rail (4), the servo knocking unit comprises a torque servo motor (6) and a knocking hammer (7), the voice frequency collector (10) is arranged in the detection box (3) and connected with the voice frequency spectrum processing unit (8), and the control panel (1) is connected with the transmission platform (2) and the torque servo motor (6) respectively. The detection method comprises the following steps of transmitting products to be detected to the detection box (3) through the guide rail (4), knocking the products to be detected, collecting and analyzing a voice frequency spectrum and a wave form to know that whether the products to be detected are qualified or not. The audio spectrum detection system and the audio spectrum detection method have the advantages of high accuracy, simpleness in operation and low cost.
Description
Technical field
The underbead crack that the present invention relates to graphite products detects, particularly a kind of graphite products underbead crack audible spectrum detection system and detection method.
Background technology
The graphite industry all is by product range estimation and knock are judged whether this product exists underbead crack by the Quality Inspector to the detection of graphite products crackle at present.Outside crackle is mainly by range estimation, and underbead crack then manually knocks product by detection person, by the feedback sound of tested graphite, whether has crackle by this tested graphite inside of micro-judgment.
There is certain unreliability in such detection means:
1. Quality Inspector's experience is the key factor whether quality inspection is passed through, so Quality Inspector's ability level directly has influence on the testing result of product.
2. the earshot of people's ear is 20Hz-20KHz, can't make accurately all sound and analyzing, and the frequency range that on-the-spot people's ear can be differentiated in noisy workshop is just less.
3. Quality Inspector's dynamics of knocking tested graphite at every turn all can not be the same, and this feedback size and frequency to sound all has a great impact.
Detect if adopt the defect-detecting equipment of ray on the market or ultrasound wave class to carry out internal fissure, dangerous large, operation is difficult, the problems such as expensive.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of accuracy rate high, simple and practical, graphite products underbead crack audible spectrum detection system and method that cost is low.
The objective of the invention is to be achieved through the following technical solutions: a kind of graphite products underbead crack audible spectrum detection system, it comprises detection case chamber, delivery platform, the servo unit that knocks, audio collection device, audible spectrum processing unit and control desk; Described delivery platform comprises guide rail and the pallet that is positioned on the guide rail, guide rail extends the detection case chamber, the servo unit that knocks comprises moment servomotor and the hammer that knocks that is connected and is positioned at the indoor and tested graphite of detection case side with this moment servomotor, it is indoor that the audio collection device is positioned at detection case, the audio collection device is connected with the audible spectrum processing unit, control desk is provided with control knob, and control desk is connected with the moment servomotor with delivery platform respectively.
Delivery platform is provided with the induction type positioning switch.
A kind of graphite products underbead crack audible spectrum detection method, it may further comprise the steps:
A, tested graphite is lifted on the pallet, starts " warehouse entry " button in the control knob, guide rail is sent tested graphite into detection case chamber and fixed position, is provided with the induction type positioning switch on the delivery platform, guarantees that product is parked in the tram;
" knocking " button in B, the startup control knob, the moment servomotor drives and knocks hammer, knocks tested graphite, and the moment servomotor will knock according to the torque value of setting, accuracy and the consistance of the torque value on tested graphite knocked in assurance, and this setting value operator can regulate and control;
C, audio collection device gather the feedback audio frequency, and image data is sent in the audible spectrum processing unit, the operator is by to the contrast of this audible spectrum curve and aim curve, makes the whether qualified judgement of this tested graphite, with aim curve in same trend, be specification product;
D, detect completely, start " delivering from godown " button in the control knob, delivery platform is delivered to tested graphite and is specified the lifting position;
The formulation of E, target audio spectrum curve is carried out actual detection by the Quality Inspector according to the qualified samples of the large miscellaneous goods of different size and is drawn, and target component is kept in the system, so that contrast when detecting.
The invention has the advantages that:
1. can send the percussion power of controlled size, guarantee to knock the stability of the dynamics on tested graphite, thereby guaranteed the reliability of audible feedback.
2. with audiovideo, the uncertainty of having avoided people's ear under varying environment, to be disturbed.
3. the Quality Inspector directly judges image graphics, and the contrast target spectrum is easy to draw accurately test result.
4. this system cost is little, and easy care has improved detection efficiency and the accuracy of Quality Inspector to the product crack detection greatly, can guarantee 99.9% detection accuracy.
Description of drawings
Fig. 1 is plan structure synoptic diagram of the present invention;
Fig. 2 is side-looking structural representation of the present invention;
Fig. 3 is the target waveform curve of the embodiment of the invention;
Fig. 4 is the target spectrum curve of the embodiment of the invention;
Fig. 5 is the A product detection waveform curve of the embodiment of the invention;
Fig. 6 is the B product detection waveform curve of the embodiment of the invention;
Fig. 7 is the audio volume control analysis of the embodiment of the invention;
Fig. 8 is the A product spectrum analysis curve of the embodiment of the invention;
Fig. 9 is the B product spectrum analysis curve of the embodiment of the invention;
Among the figure, the 1-control desk, the 2-delivery platform, 3-detection case chamber, the 4-guide rail, the 5-pallet, 6-moment servomotor, 7-knocks hammer, 8-audible spectrum processing unit, 9-control knob, 10-audio collection device.
Embodiment
Further specify technical scheme of the present invention below in conjunction with the drawings and specific embodiments, but the content that the present invention protects is not limited to the following stated.
As shown in Figure 1 and Figure 2, a kind of graphite products underbead crack audible spectrum detection system comprises detection case chamber 3, delivery platform 2, the servo unit that knocks, audio collection device 10, audible spectrum processing unit 8 and control desk 1; Described delivery platform 2 comprises guide rail 4 and the pallet 5 that is positioned on the guide rail 4, guide rail 4 extends detection case chamber 3, servo knock the unit comprise moment servomotor 6 be connected with this moment servomotor 6 and be positioned at detection case indoor 3 and tested graphite other knock hammer 7, it is indoor that audio collection device 10 is positioned at detection case, audio collection device 10 is connected with audible spectrum processing unit 8, control desk 1 is provided with control knob 9, and control desk 1 is connected with the moment servomotor with delivery platform 2 respectively and is connected.
A kind of graphite products underbead crack audible spectrum detection method, it may further comprise the steps:
A, tested graphite is lifted on the pallet 5, starts " warehouse entry " button in the control knob 9, guide rail 4 is sent tested graphite into detection case chamber 3 and fixed position, is provided with the induction type positioning switch on the delivery platform 2, guarantees that product is parked in the tram;
" knocking " button in B, the startup control knob 9, moment servomotor 6 drives and knocks hammer 7, knocks tested graphite, and moment servomotor 6 will knock according to the torque value of setting, accuracy and the consistance of the torque value on tested graphite knocked in assurance, and this setting value operator can regulate and control;
C, 10 pairs of feedbacks of audio collection device audio frequency gather, and image data is sent in the audible spectrum processing unit 8, the operator is by the contrast to this audible spectrum curve and aim curve, make the whether qualified judgement of this tested graphite, with aim curve in same trend, be specification product;
D, detect completely, start " delivering from godown " button in the control knob 9, delivery platform 2 is delivered to tested graphite and is specified the lifting position;
The formulation of E, target audio spectrum curve is carried out actual detection by the Quality Inspector according to the qualified samples of the large miscellaneous goods of different size and is drawn, and target component is kept in the system, so that contrast when detecting.
Mainly whether qualified by testing product being carried out audible spectrum and wave form analysis if drawing detected product in the present invention, and audible spectrum and wave form analysis may further comprise the steps:
(1) sets up aim curve: provide under the percussion power of 20N in system with class specification product, be respectively by drawing aim curve after 8 tests of audible spectrum processing unit: the target waveform curve, as shown in Figure 3, the target spectrum curve, as shown in Figure 4, preserve audible spectrum processing unit 8, be set as the desired value of this series products.
(2) gather detected product detection curve: test respectively like product A and B, provide in system under the percussion power of 20N, recording detection curve is respectively: A product squiggle as shown in Figure 5, A product spectrum curve as shown in Figure 8, B product squiggle as shown in Figure 6, B product spectrum curve is as shown in Figure 9.
(3) audible feedback analysis comprises wave form analysis and spectrum analysis:
Wave form analysis: by finding out the feedback waveform of same class product under same 20N percussion power:
The audible feedback of B product as shown in Figure 6, Wave crest and wave trough is more mellow and fuller, and is excessively smoother, effectively audio frequency is long perdurability, wave-form similarity is high as shown in Figure 3 with aim curve.
The audible feedback of A product as shown in Figure 5, the overshoot of Wave crest and wave trough is larger, and is excessively steeper, effectively the attenuation ratio of audio frequency is very fast, with aim curve similarity extreme difference.
Judge by the comparison of wave shape analysis: the A product is the unacceptable product that internal fissure is arranged, and the B product is the certified products flawless.
Spectrum analysis:
As shown in Figure 8 the contrast of the spectrum curve of A product (blue curve) and target spectrum curve (green curve) is easy to find out that the spectrum curve of A product in same sampling time section and target spectrum curve similarity are very poor, particularly lap is seldom in the following frequency range of 5000Hz.
Relative, as shown in Figure 9 the contrast of the spectrum curve of B product (red curve) and target spectrum curve (green curve) is easy to find out that the spectrum curve of B product in same sampling time section and target spectrum curve similarity are very high, the whole frequency range inner curve is almost all overlapping.
Judge by the spectral contrast analysis: the A product is the unacceptable product that internal fissure is arranged, and the B product is the certified products flawless.
Comprehensive audio volume control and result of spectrum analysis are reached a conclusion: the A product has underbead crack, and is defective; B product flawless is qualified.
Claims (3)
1. graphite products underbead crack audible spectrum detection system, it is characterized in that: it comprises detection case chamber (3), delivery platform (2), the servo unit that knocks, audio collection device (10), audible spectrum processing unit (8) and control desk (1); Described delivery platform (2) comprises guide rail (4) and is positioned at pallet (5) on the guide rail (4), guide rail (4) extends detection case chamber (3), servo knock the unit comprise moment servomotor (6) be connected with this moment servomotor (6) and be positioned at detection case indoor (3) and tested graphite other knock hammer (7), it is indoor that audio collection device (10) is positioned at detection case, audio collection device (10) is connected with audible spectrum processing unit (8), control desk (1) is provided with control knob (9), and control desk (1) is connected 6 with delivery platform (2) with the moment servomotor respectively) be connected.
2. a kind of graphite products underbead crack audible spectrum detection system according to claim 1, it is characterized in that: delivery platform (2) is provided with the induction type positioning switch.
3. graphite products underbead crack audible spectrum detection method, it is characterized in that: it may further comprise the steps:
A, tested graphite is lifted on the pallet (5), start " warehouse entry " button in the control knob (9), guide rail (4) is sent tested graphite into detection case chamber (3) and fixed position, and delivery platform is provided with the induction type positioning switch on (2), guarantees that product is parked in the tram;
" knocking " button in B, the startup control knob (9), moment servomotor (6) drives and knocks hammer (7), knock tested graphite, moment servomotor (6) will knock according to the torque value of setting, accuracy and the consistance of the torque value on tested graphite knocked in assurance, and this setting value operator can regulate and control;
C, audio collection device (10) gather the feedback audio frequency, and image data is sent in the audible spectrum processing unit (8), the operator is by the contrast to this audible spectrum curve and aim curve, make the whether qualified judgement of this tested graphite, with aim curve in same trend, be specification product;
D, detect completely, start " delivering from godown " button in the control knob (9), delivery platform (2) is delivered to tested graphite and is specified the lifting position;
The formulation of E, target audio spectrum curve is carried out actual detection by the Quality Inspector according to the qualified samples of the large miscellaneous goods of different size and is drawn, and target component is kept in the system, so that contrast when detecting.
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| CN103969329A (en) * | 2014-04-01 | 2014-08-06 | 清华大学 | Miniature material damage detection device |
| CN109444261A (en) * | 2018-09-19 | 2019-03-08 | 中钢集团新型材料（浙江）有限公司 | A kind of fine grained isostatic pressing formed graphite interiors of products defects detection velocity of sound method of detection |
| CN110539777A (en) * | 2019-09-29 | 2019-12-06 | 王艺锦 | intelligent track low strain crack detection device |
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Application publication date: 20130327 |