CN106596711A - Hydraulic cylinder detection system based on pulsed eddy current - Google Patents
Hydraulic cylinder detection system based on pulsed eddy current Download PDFInfo
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Abstract
The invention belongs to hydraulic cylinder detection systems and particularly relates to a hydraulic cylinder detection system based on pulsed eddy current. The hydraulic cylinder detection system comprises a signal generating module, a signal collection module, and a signal processing module; the signal generating module is in bidirectional communication connection with the signal collection module, the output end of the signal collection module is connected to the input end of the signal processing module, the output end of the signal processing module is connected to the input end of the signal generating module, and the output end of the signal generating module is connected to a detection module. After an exciting oil generates a magnetic field in a hydraulic cylinder block, inductive voltages in the hydraulic cylinder in various directions are detected through a plurality of detection coils evenly distributed; the defect of the tradition that internal flaw detection and inner surface scratch detection can only be carried out separately is overcome; defects of a hydraulic cylinder in various directions can be detected, including hydraulic cylinder inner flaw and inner surface scratch, and detection efficiency and precision are improved.
Description
Technical field
The invention belongs to hydraulic cylinder detecting system, more particularly to a kind of hydraulic cylinder detecting system based on impulse eddy current.
Background technology
The general character critical component that hydraulic cylinder is high as added value in engineering machinery, have a large capacity and a wide range, it is in severe building ring
Run for a long time in border, inevitably occur wear and tear, pull, fatigue, loosen, peel off, the aged deterioration even phenomenon such as damage,
The service behaviour for causing hydraulic cylinder declines, technology status deteriorates, and will be eliminated after Rejection standard is reached.Newly-increased every year is retired
Hydraulic cylinder still being constantly increasing, therefore, implement hydraulic cylinder and remanufacture, ample resources can not only be saved for country, and have
Significant economic benefit.
It is as blank, external dimensions and internal feature possibility using the parts scrapped due to remanufacturing hydraulic cylinder
Probabilistic change occurs, in order to ensure to remanufacture the security of hydraulic cylinder military service, it is necessary to carry out strict detection to it.
To hydraulic cylinder in addition to carrying out necessary dimensional accuracy and detecting, in addition it is also necessary to carry out internal trachoma, slight crack etc. carrying out flaw detection and
The scuffing detection of hydraulic cylinder inner surface.At present when internal carrying out flaw detection is carried out with inner surface scratch wound detection, typically distinguish
Independently detected, thus seriously reduced the efficiency of detection work, and presently used internal defect-detecting equipment is also only capable of
Once detect easily occur omitting phenomenon to one position of pressure cylinder, reduce the efficiency and accuracy of detection of detection work.
The content of the invention
The present invention is in order to overcome the above-mentioned deficiencies of the prior art, there is provided a kind of hydraulic cylinder detection system based on impulse eddy current
System, the present invention is capable of detecting when the defect of hydraulic cylinder all directions, including the flaw detection of hydraulic cylinder inside and inner surface scratch wound, improves
The efficiency and precision of detection, and eliminate the Lift-off effect produced because of the deviation of hydraulic cylinder axis and sensor array axis.
For achieving the above object, following technical measures be present invention employs：
Based on the hydraulic cylinder detecting system of impulse eddy current, including signal generator module, signal acquisition module, signal transacting mould
Block, two-way communication link between the signal generator module and signal acquisition module, the output end of the signal acquisition module connects
The input of signal processing module is connect, the output end of the signal processing module connects the input of signal generator module, described
The output end of signal generator module is also connected with detection module.
Preferably, the signal generator module includes controller, waveform generator, power amplification circuit and excitation line
Circle, wherein,
Controller, for triggering waveform generator signal, the input connection signal processing module of the controller are produced
Output end, the controller two-way communication link between signal acquisition module, waveform generator respectively, the output end of controller connects
Connect detection module；
Waveform generator, its output end connects the input of power amplification circuit；
Power amplification circuit, for improving the driving force of the signal from waveform generator, the power amplification circuit
Output end connect excitation coil input；
Excitation coil, it is placed in hydraulic cylinder, for producing magnetic field.
Preferably, the signal acquisition module includes array detection sensor and multiplexer, wherein,
Array detection sensor, inside includes multiple detection coils, and the detection coil is used to measure in hydraulic cylinder
The vortex of generation, and export induced voltage signal；
Multiplexer is for receiving the induced voltage signal from the output of array detection sensor and selectively defeated
Go out the induced voltage signal to signal processing module, two-way communication link between multiplexer and controller.
Preferably, the signal processing module include pre-amplification circuit, signal conditioning circuit, lift-off suppression circuit and
Analog to digital conversion circuit, wherein,
Pre-amplification circuit, for being amplified process to the induced voltage signal from multiplexer；
Signal conditioning circuit, its input connects the output end of the pre-amplification circuit, for from preposition amplification
The induced voltage signal of circuit is filtered and peak value process；
Lift-off suppression circuit, its input connects the output end of signal conditioning circuit, for reducing from signal condition electricity
The error of the induced voltage signal on road；
Analog to digital conversion circuit, its input connects the output end of lift-off suppression circuit, for by the induced voltage signal
The data signal of computer-reader form is converted into, and the data signal is sent to into controller.
Further, the excitation coil along mounting groove the coiling in the shape of a spiral of cell body inwall, multiple detection lines
Circle is arranged at the cell body bottom of mounting groove, and excitation coil is located at the upper end of multiple detection coils, and the mounting groove is arranged on liquid
In cylinder pressure body, and support tube is installed at the inner periphery of excitation coil.
Further, multiple detection coils are distributed evenly in the cell body bottom of mounting groove, and adjacent detection line
Circle the distance between for single detection coil length twice.
Further, the pre-amplification circuit include the first amplifier, model AD620 of first amplifier,
The pin 2 of the first amplifier connect respectively the negative pole of the second diode, the 3rd diode cathode, one end of second resistance, the 5th
One end of resistance, one end of the second electric capacity, one end of the 3rd electric capacity, the other end of the 3rd electric capacity, the 5th resistance it is another
End is grounded, the other end of the second resistance connect respectively the positive pole of the first Zener diode, one end of 3rd resistor and
One output end of multiplexer, another output end of the multiplexer connect respectively the other end of 3rd resistor,
The negative pole of the first Zener diode, one end of first resistor, the other end of the first resistor connects respectively the one of the first electric capacity
End, one end of the 4th resistance, the other end of the second electric capacity, the positive pole of the second diode, the 3rd diode cathode and first are put
The pin 3 of big device, the other end of first electric capacity, the other end of the 4th resistance are grounded；The pin 1 of first amplifier
Connect one end and the power supply of the 4th electric capacity, the other end ground connection of the 4th electric capacity；The pin 7 of the first amplifier passes through respectively
One end, one end of the 7th resistance, one end of the 8th resistance of switch the 6th resistance of connection, the 6th resistance, the 7th resistance, the
In parallel between eight resistance, the other end of the 6th resistance, the other end of the 7th resistance, the other end of the 8th resistance are all connected with the
The pin 8 of one amplifier；The pin 4 of the first amplifier connects one end of the 5th electric capacity and power supply, the 5th electric capacity it is another
One end connects the pin 5 of the first amplifier and is grounded, and the output end of first amplifier connects the input of signal conditioning circuit
End.
Further, the signal conditioning circuit includes the first chip and the second chip, the model of first chip
UAF42AP, model PGA207UA of the second chip, the pin 12 of first chip connects the pin 6 of the first amplifier, the
The pin 9 of one chip connects one end of the 6th electric capacity, and the other end of the 6th electric capacity connects the pin 11 of the first chip and connects
Ground, the pin 10 of the first chip connects one end of the 7th electric capacity and power supply, the other end of the 7th electric capacity, the first chip
Pin 3 is grounded, and the pin 7 of the first chip, pin 1 connect respectively one end of the first inductance, one end of the second inductance, and described
The other end of one inductance, the other end of the second inductance connect respectively the pin 8 of the first chip, pin 14, the pin 6 of the first chip
Connect the pin 5 of the second chip；The pin 1 of second chip connects respectively one end, one end of the 9th electric capacity of the 8th electric capacity
And power supply, the other end of the 8th electric capacity, the other end of the 9th electric capacity be all connected with the pin 10 of the second chip and be grounded, institute
State the pin 4 of the second chip, pin 14 to be grounded, the pin 11 of the second chip, pin 12 are all connected with the defeated of lift-off suppression circuit
Enter end.
Further, the lift-off suppression circuit includes the second amplifier and the 3rd amplifier, second amplifier
Positive signal input connect one end of the tenth electric capacity, one end of the tenth adjustable resistance respectively, the tenth electric capacity it is another
End ground connection, the negative signal input of the second amplifier connects respectively one end of the 9th resistance, one end of the 11st resistance, described
The other end of the 9th resistance, the other end of the tenth adjustable resistance are all connected with the pin 11 of the second chip, pin 12, and the described 11st
The other end of resistance connects respectively one end of the 12nd resistance and the output end of the second amplifier, the 12nd resistance it is another
One end connects respectively one end of the 14th adjustable resistance, the negative signal input of the 3rd amplifier, the 14th adjustable electric
The other end of resistance connects respectively the output end of the 3rd amplifier and the input of analog to digital conversion circuit, the positive pole of the 3rd amplifier
Signal input part connects one end of the 13rd resistance, the other end ground connection of the 13rd resistance.
Further, the waveform generator includes the 3rd chip, the model U.S. Analog of the 3rd chip
The AD9854 chips of Device companies production.
The beneficial effects of the present invention is：
1), the present invention includes signal generator module, signal acquisition module, signal processing module, and excitation coil is in hydraulic cylinder
Produce in vivo behind magnetic field, by equally distributed multiple detection coils the induced voltage of all directions in hydraulic cylinder is detected, this
It is bright overcome it is traditional carrying out separately being detected when internal carrying out flaw detection is detected with inner surface scratch wound, this
The bright defect for being capable of detecting when hydraulic cylinder all directions, including the flaw detection of hydraulic cylinder inside and inner surface scratch wound, improve detection
Efficiency and precision.
2), circuit structure of the invention is simple, be easily achieved, and signal processing module includes lift-off suppression circuit, effectively
Eliminate the Lift-off effect produced because of the deviation of hydraulic cylinder axis and sensor array axis, power amplification circuit is used to carry
The driving force of the high signal from waveform generator, reaches the purpose that loading excitation coil produces excitation field.
3), multiple detection coils are distributed evenly in the cell body bottom of mounting groove, and between adjacent detection coil
Distance be single detection coil length twice, effectively prevent interfering between coil.
Description of the drawings
Fig. 1 is the circuit structure block diagram of the hydraulic cylinder detecting system of the present invention；
Fig. 2 is the coil profile of the hydraulic cylinder detecting system of the present invention；
Fig. 3 is graph of a relation of the distance between the detection coil of the present invention with single detection coil length；
Fig. 4 is the schematic diagram of the pre-amplification circuit of the present invention；
Fig. 5 is the schematic diagram of the signal conditioning circuit of the present invention；
Fig. 6 is the schematic diagram of the lift-off suppression circuit of the present invention；
Fig. 7 is that the induced voltage signal of the present invention changes over figure.
10-signal generator module, 11-controller, 12-waveform generator
13-power amplification circuit, 14-excitation coil, 15-mounting groove
16-support tube, 20-signal acquisition module, 21-array detection sensor
22-multiplexer, 30-signal processing module, 31-pre-amplification circuit
32-signal conditioning circuit, 33-lift-off, 34-analog to digital conversion circuit of suppression circuit
A1～A3-the first amplifier～the 3rd amplifier U1～U3-the first chip～the 3rd chip
The inductance of C1～C9-the first electric capacity～the 9th electric capacity L1, L2-first, the second inductance
R1～R9, R11～R13-first resistor～the 9th resistance, the 11st resistance～the 13rd resistance
The adjustable resistance of R10, R14 the-the tenth, the 14th adjustable resistance
The diode of D1-the first Zener diode D2, D3-second, the 3rd diode
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, the hydraulic cylinder detecting system based on impulse eddy current, including signal generator module 10, signals collecting mould
Block 20, signal processing module 30, two-way communication link between the signal generator module 10 and signal acquisition module 20, the letter
The output end of number acquisition module 20 connects the input of signal processing module 30, the output end connection of the signal processing module 30
The input of signal generator module 10, the output end of the signal generator module 10 is also connected with detection module, so as to detecting liquid
Flaw detection and inner surface scratch wound inside cylinder pressure.
As shown in figure 1, the signal generator module 10 includes controller 11, waveform generator 12, power amplification circuit 13
And excitation coil 14, the controller 11 be used for trigger waveform generator 12 produce signal, the input of the controller 11
The output end of connection signal processing module 30, controller 11 is two-way between signal acquisition module 20, waveform generator 12 respectively
Communication connection, the output end connection detection module of controller 11；The output end connection power amplification circuit 13 of waveform generator 12
Input；Power amplification circuit 13 is used to improve the driving force of the signal from waveform generator 12, the power amplification
The output end of circuit 13 connects the input of excitation coil 14；Excitation coil 14 is placed in hydraulic cylinder, receives square-wave signal,
And produce magnetic field.
Preferably, waveform generator 12 is square-wave generator.
As shown in figure 1, the signal acquisition module 20 includes array detection sensor 21 and multiplexer 22, institute
Stating the inside of array detection sensor 21 includes multiple detection coils, and the detection coil is used to measure in tested hydraulic cylinder body produces
Raw vortex, and export induced voltage signal；Multiplexer 22 is used to receive from the output of array detection sensor 21
Induced voltage signal, and the induced voltage signal is selectively exported to signal processing module 30, multiplexer 22 and control
Two-way communication link between device 11.
As shown in figure 1, the signal processing module 30 includes that pre-amplification circuit 31, signal conditioning circuit 32, lift-off press down
Circuit processed 33 and analog to digital conversion circuit 34, the pre-amplification circuit 31 is used for the induced voltage from multiplexer 22
Signal is amplified process；The input of the signal conditioning circuit 32 connects the output end of the pre-amplification circuit 31, uses
In the induced voltage signal from pre-amplification circuit 31 is filtered and peak value process；The lift-off suppression circuit 33 it is defeated
Enter the output end of end connection signal conditioning circuit 32, for reducing the mistake of the induced voltage signal from signal conditioning circuit 32
Difference；The output end of the input connection lift-off suppression circuit 33 of analog-digital conversion circuit as described 34, for the induced voltage to be believed
Number the data signal of computer-reader form is converted into, and the data signal is sent to into controller 11.
Specifically, the triggering of the controller 11 square-wave generator produces the square-wave signal of certain frequency, power amplification circuit
13 driving forces for improving square-wave signal, so as to load excitation coil 14 excitation field is produced；Hydraulic cylinder under the influence of a magnetic field,
Vortex can be produced according to eddy current effect, detection coil measures the vortex produced in tested hydraulic cylinder body, exports induced voltage signal,
Controller 11 is additionally operable to control multiplexer 22 and selectively successively leads to the induced voltage signal that different detection coils is exported
Cross pre-amplification circuit 31, signal conditioning circuit 32, lift-off suppression circuit 33 and analog to digital conversion circuit 34 to send to detection mould
In block.
Such as the coil profile that Fig. 2 is hydraulic cylinder detecting system of the invention, the excitation coil 14 is along mounting groove 15
The coiling in the shape of a spiral of cell body inwall so that hydraulic cylinder field homogeneity distribution.Multiple detection coils are arranged at peace
The cell body bottom of tankage 15, excitation coil 14 is located at the upper end of multiple detection coils, and the mounting groove 15 is arranged on hydraulic cylinder
It is interior, and support tube 16 is installed at the inner periphery of excitation coil 14, the space that the coil distribution of the present invention takes is little, and structure is tight
Gather.
As shown in figure 3, multiple detection coils are distributed evenly in the cell body bottom of mounting groove 15, and adjacent detection
The distance between coil is the twice of single detection coil length, effectively prevent interfering between coil.
As shown in figure 4, the pre-amplification circuit 31 includes the first amplifier A1, the model of the first amplifier A1
The pin 2 of AD620, the first amplifier A1 connects respectively the negative pole of the second diode D2, the 3rd diode D3 positive poles, second resistance
One end of R2, one end of the 5th resistance R5, one end of the second electric capacity C2, one end of the 3rd electric capacity C3, the 3rd electric capacity C3's
The other end, the other end of the 5th resistance R5 are grounded, and the other end of second resistance R2 connects respectively the first Zener diode
One output end of the positive pole of D1, one end of 3rd resistor R3 and multiplexer 22, the multiplexer 22 it is another
Individual output end connects respectively the other end of 3rd resistor R3, the negative pole of the first Zener diode D1, one end of first resistor R1, institute
State first resistor R1 the other end connect respectively one end of the first electric capacity C1, one end of the 4th resistance R4, the second electric capacity C2 it is another
One end, the pin 3 of the positive pole, the 3rd diode D3 negative poles and the first amplifier A1 of the second diode D2, first electric capacity
The other end of C1, the other end of the 4th resistance R4 are grounded；The pin 1 of the first amplifier A1 connects the one of the 4th electric capacity C4
End and power supply, the other end ground connection of the 4th electric capacity C4；The pin 7 of the first amplifier A1 is respectively by switch connection the 6th
One end of resistance R6, one end of the 7th resistance R7, one end of the 8th resistance R8, the 6th resistance R6, the 7th resistance R7, the 8th
It is in parallel between resistance R8, the other end of the 6th resistance R6, the other end of the 7th resistance R7, the 8th resistance R8 the other end it is equal
Connect the pin 8 of the first amplifier A1；The pin 4 of the first amplifier A1 connects one end of the 5th electric capacity C5 and power supply, described
The other end of the 5th electric capacity C5 connects the pin 5 of the first amplifier A1 and is grounded, the output end connection of the first amplifier A1
The input of signal conditioning circuit 32.
Pre-amplification circuit 31 adopts symmetrical expression differential amplifier circuit, can effectively improve the noise of induced voltage signal
Than, the first Zener diode D1 is used to carry out induced voltage signal clamper, and can absorb instantaneous big pulsed power signal,
And voltage clamp to predeterminated level, the use of the first Zener diode D1, on the one hand ensure that rear class precision circuit
Safety, on the other hand efficiently reduces the input noise of pre-amplification circuit 31, and AD620 is the logical of a low power consumption high-precision
With instrument amplifier, it has the advantages that big amplification range, high cmrr, easy to use, by different from one
Outer meeting resistance can just arrange 1～1000 different multiplication factor.
As shown in figure 5, the signal conditioning circuit 32 includes the first chip U1 and the second chip U2, the first chip U1
Model UAF42AP, model PGA207UA of the second chip U2, the first chip U1 pin 12 connection first amplify
The pin 6 of device A1, the pin 9 of the first chip U1 connects one end of the 6th electric capacity C6, the other end connection of the 6th electric capacity C6
The pin 11 of the first chip U1 is simultaneously grounded, and the pin 10 of the first chip U1 connects one end and the power supply of the 7th electric capacity C7, described
The other end of the 7th electric capacity C7, the pin 3 of the first chip U1 are grounded, and the pin 7 of the first chip U1, pin 1 connect respectively
One end of one inductance L1, one end of the second inductance L2, the other end of the first inductance L1, the other end difference of the second inductance L2
Connect pin 8, the pin 14 of the first chip U1, the pin 6 of the first chip U1 connects the pin 5 of the second chip U2；Described second
The pin 1 of chip U2 connects respectively one end, one end of the 9th electric capacity C9 and the power supply of the 8th electric capacity C8, the 8th electric capacity C8
The other end, the other end of the 9th electric capacity C9 be all connected with the pin 10 of the second chip U2 and be grounded, the second chip U2's draws
Pin 4, pin 14 are grounded, and the pin 11 of the second chip U2, pin 12 are all connected with the input of lift-off suppression circuit 33.
As shown in fig. 6, the lift-off suppression circuit 33 includes the second amplifier A2 and the 3rd amplifier A3, described second puts
The positive signal input of big device A2 connects respectively one end of the tenth electric capacity C10, one end of the tenth adjustable resistance R10, and described the
The other end ground connection of ten electric capacity C10, the negative signal input of the second amplifier A2 connect respectively one end of the 9th resistance R9, the
One end of 11 resistance R11, the other end of the 9th resistance R9, the other end of the tenth adjustable resistance R10 are all connected with the second core
The pin 11 of piece U2, pin 12, the other end of the 11st resistance R11 connect respectively one end of the 12nd resistance R12 and
The output end of the second amplifier A2, the other end of the 12nd resistance R12 connects respectively the one of the 14th adjustable resistance R14
End, the negative signal input of the 3rd amplifier A3, the other end of the 14th adjustable resistance R14 connects respectively the 3rd amplification
The output end of device A3 and the input of analog to digital conversion circuit 34, the positive signal input connection the 13rd of the 3rd amplifier A3
One end of resistance R13, the other end ground connection of the 13rd resistance R13.
The decoupling that lift-off suppression circuit 33 adopts phase shift and amplitude amplifying circuit to realize phase and amplitude is adjusted, and makes phase place
Must adjust separate with amplitude, so as to improve the regulated efficiency of reference point, phase-shift circuit is lag network, i.e. the second amplifier
The output end voltage U2 of A2 lags behind input terminal voltage U1, and | U1 |=| U2 | i.e. phase-shift circuit adjustment phase places, does not affect electricity
The amplitude of pressure.The negative feedback network that amplitude amplifying circuit is made up of resistance element, the circuit only adjusts output voltage amplitude, no
Phase place is affected, the output voltage of the 3rd amplifier A3 is adjusted respectively by the tenth adjustable resistance R10 and the 14th adjustable resistance R14
The phase and amplitude of U3, and both are independent of each other.Effectively eliminate because of the deviation of hydraulic cylinder axis and sensor array axis
And the Lift-off effect for producing.
The waveform generator 12 includes the 3rd chip U3, the model U.S. Analog of the 3rd chip U3
The AD9854 chips of Device companies production, the DDS kernels of AD9854 have the frequency register of 48, it is allowed to the signal of output
Frequency is up to 150MHz, and internal clock frequencies are 300MHz, there is provided the orthogonal digit weighted-voltage D/A converter of binary channels 12, can enter line frequency
Keying, binary phase shift keying, phase-shift keying (PSK), pulse-frequency modulation, Modulation and Amplitude Modulation operation are moved, 3 built-in psecs effectively shake deviation
Sine wave can be converted to square wave output by ultrahigh-speed comparator, and AD9854 loaded and started working after control word, first passes around
Stair-stepping analog sinus signals are produced after DAC, then smooth sinusoidal signal is obtained by internal low pass filter, finally
Pulse square wave signal is obtained by internal voltage comparator.Square-wave signal good stability, frequency resolution height that it is produced, it is raw
Into the control word that can be given by controller 11 of waveform parameter of square-wave signal carry out real-time regulation, it is easy to accomplish automation control
System.
Induced voltage signal if Fig. 7 is the present invention changes over figure, and induced voltage signal is through pre-amplification circuit
31st, waveform as shown in Figure 7 is formed after signal conditioning circuit 32, lift-off suppression circuit 33, can therefrom sees the time of earlier T 1
Section induced voltage signal decay is fast, amplitude big, it is slow in the decay of T2 time period induced voltage signals and amplitude is little, for morning
The induced voltage signal that the amplitude and the rate of disintegration of phase are big is easy to observe and collects, but signal characteristic difference is less；And it is used for area
Whether other test specimen different-thickness or defective signal characteristic quantity are mainly reflected in the letter of induced voltage signal later stage microvolt magnitude
Number, it is easy to disturbed by outside noise, so needing the induced voltage signal of the T2 time periods in later stage compared with low distortion
In the state of be adjusted in effective acquisition range, therefore, extract micro- under relatively strong, more complicated electromagnetic interference and noise background
Weak low-frequency pulse eddy current signal, is the key accurately judged defect.
The present invention is capable of detecting when the defect of hydraulic cylinder all directions, including the flaw detection of hydraulic cylinder inside and inner surface scratch wound,
The efficiency and precision of detection are improve, and eliminates the lift-off produced because of the deviation of hydraulic cylinder axis and sensor array axis
Effect.
Claims (10)
1. the hydraulic cylinder detecting system of impulse eddy current is based on, it is characterised in that：Including signal generator module (10), signals collecting mould
Block (20), signal processing module (30), two-way communication between the signal generator module (10) and signal acquisition module (20) connects
Connect, the input of output end connection signal processing module (30) of the signal acquisition module (20), the signal processing module
(30) input of output end connection signal generator module (10), the output end of the signal generator module (10) is also connected with inspection
Survey module.
2. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 1, it is characterised in that：The signal produces mould
Block (10) includes controller (11), waveform generator (12), power amplification circuit (13) and excitation coil (14), wherein,
Controller (11), for triggering waveform generator (12) signal, the input connection signal of the controller (11) are produced
The output end of processing module (30), controller (11) is two-way between signal acquisition module (20), waveform generator (12) respectively
Communication connection, the output end connection detection module of controller (11)；
Waveform generator (12), the input of its output end connection power amplification circuit (13)；
Power amplification circuit (13), for improving the driving force of the signal from waveform generator (12), the power amplification
The input of output end connection excitation coil (14) of circuit (13)；
Excitation coil (14), it is placed in hydraulic cylinder, for producing magnetic field.
3. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 2, it is characterised in that：The signals collecting mould
Block (20) includes array detection sensor (21) and multiplexer (22), wherein,
Array detection sensor (21), inside includes multiple detection coils, and the detection coil is used to measure in hydraulic cylinder
The vortex of generation, and export induced voltage signal；
Multiplexer (22), for receiving the induced voltage signal from array detection sensor (21) output, and selects
The output induced voltage signal in ground is to signal processing module (30), two-way between multiplexer (22) and controller (11)
Letter connection.
4. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 3, it is characterised in that：The signal transacting mould
Block (30) includes pre-amplification circuit (31), signal conditioning circuit (32), lift-off suppression circuit (33) and analog to digital conversion circuit
(34), wherein,
Pre-amplification circuit (31), for being amplified process to the induced voltage signal from multiplexer (22)；
Signal conditioning circuit (32), its input connects the output end of the pre-amplification circuit (31), for from preposition
The induced voltage signal of amplifying circuit (31) is filtered and peak value process；
Lift-off suppression circuit (33), the output end of its input connection signal conditioning circuit (32) is adjusted for reducing from signal
The error of the induced voltage signal of reason circuit (32)；
Analog to digital conversion circuit (34), the output end of its input connection lift-off suppression circuit (33), for by the induced voltage
Signal is converted into the data signal of computer-reader form, and the data signal is sent to into controller (11).
5. the hydraulic cylinder detecting system based on impulse eddy current as described in claim 3 or 4, it is characterised in that：The excitation line
(14) are enclosed along the cell body inwall coiling in the shape of a spiral of mounting groove (15), multiple detection coils are arranged at mounting groove (15)
Cell body bottom, excitation coil (14) is arranged in hydraulic cylinder positioned at the upper end of multiple detection coils, the mounting groove (15),
And support tube (16) is installed at the inner periphery of excitation coil (14).
6. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 5, it is characterised in that：Multiple detection lines
Circle is distributed evenly in the cell body bottom of mounting groove (15), and the distance between adjacent detection coil is long for single detection coil
The twice of degree.
7. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 4, it is characterised in that：The preposition amplification electricity
Road (31) includes the first amplifier (A1), model AD620 of first amplifier (A1), the pin of the first amplifier (A1)
2 connect respectively the negative pole of the second diode (D2), the 3rd diode (D3) positive pole, one end of second resistance (R2), the 5th resistance
(R5) one end, one end of the second electric capacity (C2), one end of the 3rd electric capacity (C3), the other end of the 3rd electric capacity (C3),
The other end of five resistance (R5) is grounded, and the other end of the second resistance (R2) connects respectively the first Zener diode (D1)
One output end of positive pole, one end of 3rd resistor (R3) and multiplexer (22), the multiplexer (22) it is another
One output end connects respectively the other end of 3rd resistor (R3), the negative pole of the first Zener diode (D1), first resistor (R1)
One end, the other end of the first resistor (R1) connect respectively one end of the first electric capacity (C1), one end of the 4th resistance (R4),
The other end of the second electric capacity (C2), the positive pole of the second diode (D2), the 3rd diode (D3) negative pole and the first amplifier
(A1) pin 3, the other end of first electric capacity (C1), the other end of the 4th resistance (R4) are grounded；Described first amplifies
The pin 1 of device (A1) connects one end of the 4th electric capacity (C4) and power supply, the other end ground connection of the 4th electric capacity (C4)；First
The pin 7 of amplifier (A1) is respectively by switch connection one end of the 6th resistance (R6), one end of the 7th resistance (R7), the 8th electric
One end of resistance (R8), the 6th resistance (R6), in parallel between the 7th resistance (R7), the 8th resistance (R8), the 6th resistance
(R6) the other end, the other end of the 7th resistance (R7), the other end of the 8th resistance (R8) are all connected with the first amplifier (A1)
Pin 8；The pin 4 of the first amplifier (A1) connects one end of the 5th electric capacity (C5) and power supply, the 5th electric capacity (C5)
The other end connects the pin 5 of the first amplifier (A1) and is grounded, the output end connection signal condition of first amplifier (A1)
The input of circuit (32).
8. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 7, it is characterised in that：The signal condition electricity
Road (32) includes the first chip (U1) and the second chip (U2), model UAF42AP of first chip (U1), the second chip
(U2) model PGA207UA, the pin 12 of first chip (U1) connects the pin 6 of the first amplifier (A1), the first core
The pin 9 of piece (U1) connects one end of the 6th electric capacity (C6), and the other end of the 6th electric capacity (C6) connects the first chip (U1)
Pin 11 and be grounded, the pin 10 of the first chip (U1) connects one end of the 7th electric capacity (C7) and power supply, and the described 7th is electric
Hold the other end of (C7), the pin 3 of the first chip (U1) to be grounded, the pin 7 of the first chip (U1), pin 1 connect respectively the
One end of one inductance (L1), one end of the second inductance (L2), the other end of first inductance (L1), the second inductance (L2) it is another
One end connects respectively the pin 8 of the first chip (U1), pin 14, and the pin 6 of the first chip (U1) connects the second chip (U2)
Pin 5；The pin 1 of second chip (U2) connect respectively one end of the 8th electric capacity (C8), one end of the 9th electric capacity (C9) with
And power supply, the other end of the 8th electric capacity (C8), the other end of the 9th electric capacity (C9) are all connected with the pin of the second chip (U2)
10 and it is grounded, the pin 4 of second chip (U2), pin 14 are grounded, and the pin 11 of the second chip (U2), pin 12 connect
Connect the input of lift-off suppression circuit (33).
9. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 8, it is characterised in that：The lift-off suppresses electricity
Road (33) includes the second amplifier (A2) and the 3rd amplifier (A3), the positive signal input point of second amplifier (A2)
Not Lian Jie the tenth electric capacity (C10) one end, one end of the tenth adjustable resistance (R10), another termination of the tenth electric capacity (C10)
Ground, the negative signal input of the second amplifier (A2) connects respectively one end of the 9th resistance (R9), the 11st resistance (R11)
One end, the other end of the 9th resistance (R9), the other end of the tenth adjustable resistance (R10) are all connected with drawing for the second chip (U2)
Pin 11, pin 12, the other end of the 11st resistance (R11) connects respectively one end and second of the 12nd resistance (R12)
The output end of amplifier (A2), the other end of the 12nd resistance (R12) connects respectively the one of the 14th adjustable resistance (R14)
End, the negative signal input of the 3rd amplifier (A3), the other end of the 14th adjustable resistance (R14) connects respectively the 3rd
The output end of amplifier (A3) and the input of analog to digital conversion circuit (34), the positive signal input of the 3rd amplifier (A3)
Connect one end of the 13rd resistance (R13), the other end ground connection of the 13rd resistance (R13).
10. the hydraulic cylinder detecting system of impulse eddy current is based on as claimed in claim 2, it is characterised in that：The waveform occurs
Device (12) includes the 3rd chip (U3), Analog Device companies of the model U.S. production of the 3rd chip (U3)
AD9854 chips.
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