CN102288682A - Device for eliminating motor electromagnetic interference influence of ultrasonic detection robot - Google Patents
Device for eliminating motor electromagnetic interference influence of ultrasonic detection robot Download PDFInfo
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- CN102288682A CN102288682A CN201110121174XA CN201110121174A CN102288682A CN 102288682 A CN102288682 A CN 102288682A CN 201110121174X A CN201110121174X A CN 201110121174XA CN 201110121174 A CN201110121174 A CN 201110121174A CN 102288682 A CN102288682 A CN 102288682A
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Abstract
The invention provides a device for eliminating motor electromagnetic interference influence of an ultrasonic detection robot. The device comprises a motor, a motor flange, a connecting mechanism, a driving screw rod, an ultrasonic flaw detector, an ultrasonic probe and a workpiece detection water tank, wherein one end part provided with an output shaft of the motor is fixed at one end of the workpiece detection water tank through the motor flange; the ultrasonic flaw detector is fixed nearby the workpiece detection water tank; the driving screw rod is connected with the motor output shaft through the connecting mechanism; the ultrasonic probe is connected with the ultrasonic flaw detector and fixed on a screw rod sleeve matched with the driving screw rod; the screw rod sleeve is fixed on a water tank between the motor and the ultrasonic flaw detector; and the motor flange and the connecting mechanism are made of an insulating material. The device can eliminate electromagnetic noise interferences of an ultrasonic automatic scanning detection device, and no special equipment and devices are used, so the cost is reduced by 2 to 5 times, and the device has a particularly obvious effect on an application occasion with a high-power motor. The device is of far-reaching significance for popularization and application of ultrasonic automatic detection devices.
Description
Technical field
The present invention relates to a kind of device of eliminating the motor electromagnetic interference effect.
Background technology
Industry auto-ultrasonic scanister is widely used in the goods Non-Destructive Testing of Aero-Space, national defense industry and high-end ferrous materials, be ensure the mechanical structured member security of operation main quality inspection means it
Scanister adopts motor drive mechanism to carry ultrasonic probe, according to AD HOC workpiece is scanned, and mini-system uses servo motor or step motor usually, and large scale system is used servo motor usually, uses motor quantity may reach tens.
Current widely used motor power is a variable-frequency power sources, and the high frequency electrical noise that it produces can cause fatal interference to ultrasound examination, and under the serious situation, this type of electrical noise can flood detection signal fully, causes signal to noise ratio (S/N ratio) to descend significantly.
Ultrasonic signal receives amplifying circuit and has very wide gain margin and dynamic range, reaches more than the 100dB, and type signal intensity requires signal to disturb electrical noise less than 150uVpp from 20Vpp to 200uVpp.The solution of nearly all motor variable-frequency power sources EMC Design all can't satisfy the requirement of ultrasound examination to signal to noise ratio (S/N ratio).
Conventional solution has: adopt the linear servo power supply of low electrical noise, rather than adopt the frequency conversion Switching Power Supply of current widespread use; When adopting the variable-frequency power sources CD-ROM drive motor when having to, between drive power supply and motor, filtering device is set, as commercially available electromagnetic interface filter spare, between driver and general supply, reactor is set, eliminate of the interference of the electromagnetic noise of ultrasound wave working frequency range as far as possible to detecting instrument; Optimize the ground connection design, adopt as far as possible little stake resistance; Adopt the signal averaging algorithm, eliminate electromagnetic noise at random, all conventional schemes all have the cost costliness, can't thoroughly eliminate noise, seriously reduce the weakness of detection efficiency.
Summary of the invention
The purpose of this invention is to provide a kind of device of eliminating ultrasound examination robot motor electromagnetic interference effect, to overcome the above-mentioned defective that prior art exists.
Device of the present invention comprises motor, motor flange, bindiny mechanism, drive lead screw, ultra-sonic defect detector, ultrasonic probe and workpiece sensing tank;
The end that described motor has an output shaft is fixed on an end of described workpiece sensing tank by motor flange, described ultra-sonic defect detector is fixed in workpiece sensing tank neighbouring the installation table top or instruction case, described drive lead screw is connected with described motor output shaft by bindiny mechanism, described ultrasonic probe is connected with ultra-sonic defect detector, and be fixed on the screw mandrel that matches with drive lead screw and put, described screw mandrel cover is fixed on the tank between motor and the ultra-sonic defect detector, it is characterized in that the material of described motor flange and bindiny mechanism is an insulating material.
The applicant finds, the electromagnetic noise interference ultrasonic signal has two kinds of approach: space radiation interference and Conduction Interference, wherein radiation interference can be resolved by shielding transfer wire and rational ground connection design, but Conduction Interference often is left in the basket owing to the use of water.
Ultrasound examination often will make water as acoustic coupling medium, and being rich in electrolytical glassware for drinking water has satisfactory electrical conductivity, is the main pathway of motor power electrical noise interference.If in design ultrasonic probe anchor clamps and ultrasound signal transmission cable, do not think better of the influence of Conduction Interference, also might become the main cause of electrical noise interference via the motor power electrical noise of hardwares such as motor mounting flange, gear train.
Based on above-mentioned discovery, the applicant has designed above-mentioned device, can fundamentally solve the signal interference problem of ultrasonic scanning imaging mechanism, as main electromagnetic interference (EMI) source, all CD-ROM drive motor that are used all should be connected with the scanning mechanism insulation, use insulating flange CD-ROM drive motor to be installed, adopt the shaft joint of type of insulation or transport tape to connect drive motor output shaft and mechanism to scanning mechanism.
The present invention's design is owing to eradicated the influence of Conducted Electromagnetic noise to the ultrasonic testing signals amplifier from designing, in conjunction with the radiated noise Shielding Design, basically can eliminate the electromagnetic noise interference of ultrasound wave autoscan pick-up unit, its signal noise of system of process optimal design can reach ultrasound examination instrument internal electrical noise level.Owing to adopt the present invention's design not need to use specific installation and device, greatly reduce the cost of system, saved the great number cost that aspects such as linear motor power supply, wave filter, special-purpose ohm level resistance eutral grounding device are brought, cost reduces by 2～5 times, and it is especially obvious to reduce effect at large capacity motor application scenario cost.And, because in modern industry is used, the linear motor power supply that effect is very low is eliminated, need custom-made or white row to produce, be provided with technical threshold for applying of ultrasound wave automatic detection device undoubtedly, be unfavorable for big commercial production, the present invention is to the far reaching significance of having applied of ultrasound wave automatic detection device.
Description of drawings
Fig. 1 is the structural representation of the device of elimination ultrasound examination robot motor electromagnetic interference effect.
Embodiment
Referring to Fig. 1, device of the present invention comprises motor 1, motor flange 2, bindiny mechanism 3, drive lead screw 4, ultra-sonic defect detector 5, ultrasonic probe 6 and workpiece sensing tank 7;
The end that described motor 1 has an output shaft is fixed on an end of described workpiece sensing tank 7 by motor flange 2, described ultra-sonic defect detector 5 is fixed near the workpiece sensing tank 7 the installation table top or instruction case, described drive lead screw 3 is connected with described motor 1 output shaft by bindiny mechanism 3, described ultrasonic probe 6 is connected with ultra-sonic defect detector 5, and be fixed on the screw mandrel cover 8 that matches with drive lead screw 4, on described screw mandrel cover 8 tanks 7 that are fixed between motor 1 and the ultra-sonic defect detector 5, it is characterized in that the material of described motor flange 2 and bindiny mechanism 3 is an insulating material;
Preferably, described insulating material is macromolecular material or inorganic material;
A kind of in the preferred phenolics of described macromolecular material, nylon, tygon, polypropylene or galss fiber reinforced resin, the polyetheretherketone (PEEK);
Described inorganic material preferably ceramic.
Preferably, described bindiny mechanism is the electrical isolation shaft joint;
Preferably, described motor is AC servo motor, DC servo motor, stepper motor, linear electric motors, torque motor etc.;
Further, all cables of servomotor adopt shielded cable and the unified ground terminal that is connected to, and this ground terminal is with before the earth is connected, and ground wire passes through energy dissipation mode filter spare, carries out filtering as magnet ring.
Embodiment 1
As the device of Fig. 1, wherein, described motor is a servomotor, and bindiny mechanism 3 is a shaft coupling;
The material of motor flange 2 is a nylon, and the shaft coupling material is a polypropylene.
Adopt the method for EN 12668/3:2000/A1:2004 Non-destructivetesting-Characterizationand verification of ultrasonic examinationequipment-Part 3:Combinedequipment document specifies to detect, the result is as follows:
Test condition:
Probe: 10MHz wideband water logging detection probe;
The test block of the dark 0.4mm diameter of sample: 50mm flat-bottom hole, titanium alloy material, manufacturer's standard
ASTM?E428-08?Standard?Practice?for?Fabrication?and?Control?of?Metal，Other?than?Aluminum，Reference?Blocks?Used?in?Ultrasonic?Testing；
Parameter is set: 25mm water journey, broadband is closed all filter functions;
Measurement result: SNR=17dB;
Adopt traditional design, signal to noise ratio (S/N ratio) is no more than 5dB.
Embodiment 2
As the device of Fig. 1, wherein, described motor is a servomotor, and bindiny mechanism 3 is a shaft coupling;
The material of motor flange 2 is that the material of phenolics, shaft coupling is pottery.
Adopt the method for EN 12668/3:2000/A1:2004 Non-destructivetesting-Characterizationand verification of ultrasonic examinationequipment-Part 3:Combinedequipment document specifies to detect, the result is as follows:
Test condition is identical with embodiment 1, and test result is also identical.
Claims (9)
1. eliminate the device of ultrasound examination robot motor electromagnetic interference effect, comprise motor (1), motor flange (2), bindiny mechanism (3), drive lead screw (4), ultra-sonic defect detector (5), ultrasonic probe (6) and workpiece sensing tank (7);
The end that described motor (1) has an output shaft by motor flange (2) be fixed on described workpiece sensing tank (7 (and an end, described ultra-sonic defect detector (5) is fixed in workpiece sensing tank (7) neighbouring the installation table top or instruction case, described drive lead screw (3) is connected with described motor 1 output shaft by bindiny mechanism (3), described ultrasonic probe (6) is connected with ultra-sonic defect detector (5), and be fixed on the screw mandrel cover (8) that matches with drive lead screw (4), described screw mandrel cover (8) is fixed on the tank (7) between motor (1) and the ultra-sonic defect detector (5), it is characterized in that the material of described motor flange (2) and bindiny mechanism (3) is an insulating material.
2. the device of elimination ultrasound examination according to claim 1 robot motor electromagnetic interference effect is characterized in that described insulating material is macromolecular material or inorganic material.
3. the device of elimination ultrasound examination according to claim 2 robot motor electromagnetic interference effect, it is characterized in that, described macromolecular material is a kind of in phenolics, nylon, tygon, polypropylene, galss fiber reinforced resin or the polyetheretherketone (PEEK), and described inorganic material is a pottery.
4. the device of elimination ultrasound examination according to claim 1 robot motor electromagnetic interference effect is characterized in that described bindiny mechanism is the electrical isolation shaft joint.
5. the device of elimination ultrasound examination according to claim 2 robot motor electromagnetic interference effect is characterized in that described bindiny mechanism is the electrical isolation shaft joint.
6. the device of elimination ultrasound examination according to claim 3 robot motor electromagnetic interference effect is characterized in that described bindiny mechanism is the electrical isolation shaft joint.
7. according to the device of each described elimination ultrasound examination robot motor electromagnetic interference effect of claim 1～6, it is characterized in that described motor is AC servo motor, DC servo motor, stepper motor, linear electric motors or torque motor.
8. according to the device of each described elimination ultrasound examination robot motor electromagnetic interference effect of claim 1～6, it is characterized in that, all cables of servomotor, adopt shielded cable and the unified ground terminal that is connected to, this ground terminal is with before the earth is connected, by energy dissipation mode filter spare, connect as magnet ring.
9. the device of elimination ultrasound examination according to claim 7 robot motor electromagnetic interference effect, it is characterized in that, all cables of servomotor, adopt shielded cable and the unified ground terminal that is connected to, this ground terminal is with before the earth is connected, ground wire carries out filtering by energy dissipation mode filter spare as magnet ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110121174XA CN102288682A (en) | 2011-05-12 | 2011-05-12 | Device for eliminating motor electromagnetic interference influence of ultrasonic detection robot |
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| CN201110121174XA CN102288682A (en) | 2011-05-12 | 2011-05-12 | Device for eliminating motor electromagnetic interference influence of ultrasonic detection robot |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833829A (en) * | 2015-05-12 | 2015-08-12 | 广州市诚臻电子科技有限公司 | Motor load adjustable device for electromagnetic compatibility test |
| CN107941920A (en) * | 2017-10-31 | 2018-04-20 | 宁波江丰生物信息技术有限公司 | A kind of supersonic detector of immersion type shielding electromagnetism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833829A (en) * | 2015-05-12 | 2015-08-12 | 广州市诚臻电子科技有限公司 | Motor load adjustable device for electromagnetic compatibility test |
| CN107941920A (en) * | 2017-10-31 | 2018-04-20 | 宁波江丰生物信息技术有限公司 | A kind of supersonic detector of immersion type shielding electromagnetism |
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Application publication date: 20111221 |