CN202814927U - Ultrasonic nondestructive flaw detector - Google Patents
Ultrasonic nondestructive flaw detector Download PDFInfo
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- CN202814927U CN202814927U CN 201220450652 CN201220450652U CN202814927U CN 202814927 U CN202814927 U CN 202814927U CN 201220450652 CN201220450652 CN 201220450652 CN 201220450652 U CN201220450652 U CN 201220450652U CN 202814927 U CN202814927 U CN 202814927U
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Abstract
The utility model discloses an ultrasonic nondestructive flaw detector. In production and processing process of steel tubes, the inside or the outside of the steel tube generates various defects, such as layering and fissure formation; when checking whether the produced steel tubes are qualified, flaw detection is needed. The ultrasonic nondestructive flaw detector is composed of a shell (1), wherein a CPLD (Complex Programmable Logic Device) (2) is mounted in the shell and connected with a photoelectrical coupling circuit (3), a MCU (Microprogrammed Control Unit) (4) and a data storage unit RAM (random-access memory) (5); the MCU is connected with a communication interface circuit (6); the photoelectrical coupling circuit is connected with a probe (8) through an ultrasonic exciting circuit (7); the probe is connected with an amplification circuit (10) through a parallel amplitude limiting protection circuit (9); the amplification circuit is connected with a detection circuit (12) through a filter circuit (11); and the detection circuit is connected with the data storage unit RAM through an A/D (analog/digital) conversion circuit (13). The ultrasonic nondestructive flaw detector is used for ultrasonic nondestructive flaw detection.
Description
Technical field
The utility model relates to a kind of ultrasonic flaw detection device.
Background technology
Steel pipe is in the process of producing and processing, and its inner or outside meeting produces the various defects such as layering, crackle; When whether the steel pipe of producing in check is qualified, need to carry out flaw detection.
Summary of the invention
The purpose of this utility model is to provide a kind of ultrasound wave that utilizes and is detected a flaw, the ultrasonic flaw detection device that can be detected under the prerequisite of the inner structure of not damaging detected object.
Above-mentioned purpose realizes by following technical scheme:
A kind of ultrasonic flaw detection device; its composition comprises: housing; the programmable logic controller (PLC) part is housed in described housing; described programmable logic controller (PLC) part connects photoelectric coupling circuit, single-chip microcomputer, data-carrier store; described single-chip microcomputer connecting communication interface circuit; described photoelectric coupling circuit connects probe by ultrasonic exciting circuit; described probe connects amplifying circuit by limiter protection circuit in parallel; described amplifying circuit connects detecting circuit by filtering circuit, and described detecting circuit connects described data-carrier store by the A/D change-over circuit.
Described ultrasonic flaw detection device, described data-carrier store connects described programmable logic controller (PLC) part, described programmable logic controller (PLC) part connects described A/D change-over circuit, described single-chip microcomputer connects described programmable logic controller (PLC) part, and described communication interface circuit connects described single-chip microcomputer.
Beneficial effect:
1. the utility model be take the ultrasonic inspection theory as basis, utilize logical process function that programmable logic controller (PLC) part CPLD is powerful in conjunction with single-chip microcomputer the core as system, realized UT (Ultrasonic Testing).
The utility model has adopted modularized design scheme, has improved the reliability of system; Select single-chip microcomputer and programmable logic controller (PLC) part CPLD cheaply on main control chip, improved the dirigibility of system development.
the accompanying drawing explanation:
Fig. 1 is the structural representation of this product
.
Fig. 2 is limiter protection circuit figure in parallel in accompanying drawing 1.
Fig. 3 is limiter protection circuit figure in parallel in accompanying drawing 1.
Fig. 4 is amplification circuit diagram in accompanying drawing 1.
Fig. 5 is filtering circuit figure in accompanying drawing 1.
Fig. 6 is detecting circuit figure in accompanying drawing 1.
embodiment:
Embodiment 1:
A kind of ultrasonic flaw detection device, its composition comprises: housing 1, programmable logic controller (PLC) part CPLD2 is housed in described housing, described programmable logic controller (PLC) part CPLD connects photoelectric coupling circuit 3, single-chip microprocessor MCU 4, data-carrier store RAM5, described single-chip microprocessor MCU connecting communication interface circuit 6, described photoelectric coupling circuit connects probe 8 by ultrasonic exciting circuit 7, described probe connects amplifying circuit 10 by limiter protection circuit 9 in parallel, described amplifying circuit connects detecting circuit 12 by filtering circuit 11, described detecting circuit connects described data-carrier store RAM by A/D change-over circuit 13.
Described ultrasonic flaw detection device, described data-carrier store RAM connects described programmable logic controller (PLC) part CPLD, described programmable logic controller (PLC) part CPLD connects described A/D change-over circuit, described single-chip microprocessor MCU connects described programmable logic controller (PLC) part CPLD, and described communication interface circuit connects described single-chip microprocessor MCU.
Embodiment 2:
The described ultrasonic flaw detection device of embodiment 1, ultrasonic exciting circuit as shown in Figure 2 is under the effect of burst pulse control signal, generation encourages the high-voltage pulse signal of ultrasonic probe and realizes hyperacoustic emission.In actual ultrasonic inspection, generally high pressure (a few hectovolt) burst pulse is added to the two ends of probe piezoelectric chip, cause the periodicity mechanically deform of piezoelectric chip, thereby form ultrasonic pulse.Voltage is higher, and the efficiency that electric energy is converted to acoustic energy is just higher, and what native system adopted is the concrete ultrasonic exciting circuit of high-pressure modular of 400V.
Embodiment 3:
The described ultrasonic flaw detection device of embodiment 1, limiter protection circuit in parallel as shown in Figure 3 is because probe is transceiver, and probe excitation high pressure will be input to receiving cable.If can not carry out amplitude limit to this signal, will damage the receiving cable circuit component, and make receiving cable a period of time after driving pulse can not normally receive flaw indication, thereby cause the nearly surface inspection erroneous judgement of steel pipe.Native system adopts limiter protection circuit in parallel, due to what adopt in the design of system, is single probe, and the amplitude of emitting voltage in order to protect the safety of amplifying circuit device work, must adopt amplitude limiter circuit up to several hectovolts.Diode D3 and D4 carry out amplitude limit to forward and the large pulse signal of negative sense respectively, have protected receiving cable, have improved the reaction sensitivity of receiving cable subsequent conditioning circuit.Because ultrasonic signal frequencies is higher, this requires diode D3 and D4 to have higher reaction velocity and bears about 400V reverse voltage.In figure, the main effect of capacitor C is every directly, has selected the ceramic condenser of 0.01 μ f in design.
Embodiment 4:
The described ultrasonic flaw detection device of embodiment 1, amplifying circuit as shown in Figure 4 is because ultrasonic probe receives the signal amplitude of returning very faint (general tens millivolts), for signal being amplified in the range that capture card is suitable, need to being amplified or be decayed signal.For signal amplitude is carried out to quantitative assessment, at first require the output voltage of amplifier and input voltage linear.For changing value that can measuring amplitude, before the signal received enters amplifier, first pass through calibrated attenuator, in order to signal amplitude is quantitatively regulated, for the unlike signal Amplitude Ratio.
By attenuator, gain control interface and gain amplifier three parts, formed.Signal is after attenuator decay, then by determine the gain amplifier amplification.The precision of attenuator is ± 2%.The ultrasonic echo signal is at the 0.2V only of amplitude when amplifying, and contains a large amount of noises, and (SNR) is lower for signal to noise ratio (S/N ratio), from waveform, is difficult to pick out flaw echo and Bottom echo.Amplitude through band-pass filter and AD603 amplified signal has the 2V left and right, and signal to noise ratio (S/N ratio) is greatly improved, and can pick out more clearly the waveform of flaw echo.When AD603 output terminal VOUT and feedback end FDBK connect feedback resistance, Gain (dB)=40 V
g+ 20; Now gain margin be 0dB ~+40dB, by regulating variable resistor, enlargement factor is become to 10 times in the design.
Embodiment 5:
The described ultrasonic flaw detection device of embodiment 1, circuit filtering circuit as shown in Figure 5 is in echoed signal, the natural frequency that the frequency of useful signal is ultrasonic probe, but there is the noise signal of various frequency contents in receiving signal, therefore before signal is carried out to analog to digital conversion, need to adopt wave filter to carry out filtering to the clutter in signal.Wave filter is that a kind of signal with particular frequency range that allows passes through, and the equipment of other all signals of decaying.The all frequencies of a desirable wave filter in its passband have a desirable gain, the gain of all frequencies beyond its passband is zero, therefore be widely used in the desired frequency part of extraction from sophisticated signal, and filter the frequency part of not expecting.In design, we utilize integrated transporting discharging MAX4104 to form second order voltage controlled voltage source bandwidth-limited circuit, in order to the noise to introducing in the signal amplification process, are controlled.
Embodiment 6:
The described ultrasonic flaw detection device of embodiment 1, detecting circuit as shown in Figure 6 is in order to obtain the detection information of object to be detected, just need to carry out demodulation to echoed signal.In defectoscope, be mainly to need which amplitude modulation information, therefore need to adopt amplitude demodulation.Amplitude demodulation is exactly to receive the high-frequency signal of modulating and restore modulation signal from amplitude.Detecting circuit commonly used is a lot, adopts diode peak envelop detection circuit here.
Embodiment 7:
The described ultrasonic flaw detection device of embodiment 1, single-chip microcomputer is that the AT89C51 that the design adopts is the flash memory of a 4K of including byte programmable and erasable, 8 single-chip microcomputers of 128 byte RAM, low-voltage, high-performance CMOS structure.Adopt ANTIEL high density nonvolatile memory manufacturing technology to manufacture, compatible mutually with MCS-51 instruction set and the output pin of industrial standard.Due to multi-functional 8 bit CPUs and flash memory are combined in one single chip, AT89C51 is a kind of efficient microcontroller, for a lot of embedded control systems provide a kind of dirigibility high and cheap scheme.
Claims (2)
1. a ultrasonic flaw detection device, its composition comprises: housing, it is characterized in that: the programmable logic controller (PLC) part is housed in described housing, described programmable logic controller (PLC) part connects photoelectric coupling circuit, single-chip microcomputer, data-carrier store, described single-chip microcomputer connecting communication interface circuit, described photoelectric coupling circuit connects probe by ultrasonic exciting circuit, described probe connects amplifying circuit by limiter protection circuit in parallel, described amplifying circuit connects detecting circuit by filtering circuit, described detecting circuit connects described data-carrier store by the A/D change-over circuit.
2. ultrasonic flaw detection device according to claim 1, it is characterized in that: described data-carrier store connects described programmable logic controller (PLC) part, described programmable logic controller (PLC) part connects described A/D change-over circuit, described single-chip microcomputer connects described programmable logic controller (PLC) part, and described communication interface circuit connects described single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220450652 CN202814927U (en) | 2012-09-06 | 2012-09-06 | Ultrasonic nondestructive flaw detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220450652 CN202814927U (en) | 2012-09-06 | 2012-09-06 | Ultrasonic nondestructive flaw detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202814927U true CN202814927U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220450652 Expired - Fee Related CN202814927U (en) | 2012-09-06 | 2012-09-06 | Ultrasonic nondestructive flaw detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043614A (en) * | 2015-05-17 | 2015-11-11 | 成都诚邦动力测试仪器有限公司 | Eddy current power measuring system based on band-pass filtering |
| CN105223273A (en) * | 2015-10-09 | 2016-01-06 | 清华大学 | A kind of motor train unit crackle detecting instrument |
-
2012
- 2012-09-06 CN CN 201220450652 patent/CN202814927U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043614A (en) * | 2015-05-17 | 2015-11-11 | 成都诚邦动力测试仪器有限公司 | Eddy current power measuring system based on band-pass filtering |
| CN105223273A (en) * | 2015-10-09 | 2016-01-06 | 清华大学 | A kind of motor train unit crackle detecting instrument |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20130906 |