CN106198728B - A kind of multichannel percussion detection device of adhesive bonding of composites structure - Google Patents
A kind of multichannel percussion detection device of adhesive bonding of composites structure Download PDFInfo
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- CN106198728B CN106198728B CN201610499896.1A CN201610499896A CN106198728B CN 106198728 B CN106198728 B CN 106198728B CN 201610499896 A CN201610499896 A CN 201610499896A CN 106198728 B CN106198728 B CN 106198728B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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Abstract
The invention discloses a kind of multichannels of adhesive bonding of composites structure to tap detection device, it includes driving circuit, conditioning circuit, N number of electromagnetic hammer and N number of striking head, and striking head and electromagnetic hammer correspond.Two electromagnetic coils built in electromagnetic hammer replace on-off under the action of drive control circuit driving current, generate alternate electromagnetic force up and down, attract metal litter that striking head is driven to pump, striking head is tapped to part surface to be checked, pressure signal is converted into electric signal by its built-in piezoelectric transducer, is transferred to drive control circuit amplification, is exported modulated signal more afterwards.The device sensitivity is high, taps frequency height, high reliablity, can be used in adhesive bonding of composites structure automation detection system, reduces cost, improve efficiency.
Description
Technical field
The present invention relates to a kind of multichannels of adhesive bonding of composites structure to tap detection device, belongs to non-destructive testing application neck
Domain.
Background technique
Adhesive bonding of composites structure is that space flight Product Development produces important one of structure.It is widely used in delivery fire
Arrow, strategic missile, in Satellite Product, such as rocket radome fairing, satellite bracket.Since adhesive bonding of composites structure member is using by hand
Operation, Job-shop producteion, and manufacturing condition is difficult to strict control, easily there is the unsticking for influencing service performance in components interior
Defect.The bonding quality of cementing structure component is carried out non-destructive testing, is the important guarantee of model reliability.
Ultrasound water spray penetrates, acoustic resonance, low frequency ultrasound, laser speckle, percussion are that practical application is more both at home and abroad at present
Bonding quality lossless detection method.Wherein, detection sensitivity, the testing result reliability highest of ultrasound water spray through transmission technique, covering
Thickness is smaller on detectability influence, but must develop dedicated detection system according to the planform of product, and detected
Product contacts larger amount of water in journey, and complex structure product detection difficulty is big；Acoustic resonance, low frequency ultrasound, laser speckle side
Method be mainly used in thin skin product bonding quality detection, but detection sensitivity with product skin thickness increase significantly
Decline；Tapping detection is presently mainly to tap detection by hand, has the characteristics that detection is easy to operate, detection sensitivity is higher, but
Defect result is by artifical influence factor.
In tapping detection non-destructive testing technology by hand, need operator using headend equipment (as tapped hammer) to measured piece
It is tapped with suitable power and speed, by tapping the built-in sensor device acquisition characteristics signal of hammer and making subsequent processing.
But hammer is tapped by artificial to measured structure exciting (percussion), therefore, different operator's dynamics is differentiated.Although
It is required that operator uses dynamics continuous, appropriate as far as possible, but same operator can not be completely eliminated and detected every time and different
Difference between the dynamics that operator's detection uses, and these different responses are the difference of signal amplitude into original signal.
Summary of the invention
Technical problem solved by the invention is: overcoming the deficiencies of the prior art and provide a kind of high sensitivity, taps frequency
The multichannel of high, high reliablity adhesive bonding of composites structure taps detection device.
The technical scheme is that a kind of multichannel of adhesive bonding of composites structure taps detection device, the device packet
Driving circuit, conditioning circuit, N number of electromagnetic hammer and N number of striking head are included, striking head and electromagnetic hammer correspond, N >=1, in which:
Driving circuit receives externally input control signal, generates the road 2N driving current signal, while exporting to N number of electricity
Magnetic hammer；
Conditioning circuit receives the knocking of N number of striking head acquisition, after amplifying, filter and comparing to knocking
It generates modulated signal and is output to external equipment；
Electromagnetic hammer, including two electromagnetic coils, magnet block and metal slide bar；Two electromagnetic coils press the opposite hand of spiral
Metal frame upper and lower ends are separately fixed at, metal slide bar passes through among the electromagnetic coil of lower end, and upper end is fixedly connected with ferromagnetism
Ferromagnetic block made of material, lower end are fixedly connected with striking head, and there are certain intervals between two electromagnetic coils, and ferromagnetic block is enable to exist
It is up and down between two electromagnetic coils；The two-way driving current signal that driving circuit is sent is respectively connected to two electromagnetic wires
Circle, two-way driving current loop cycle are alternately present, and so that electric current in two electromagnetic coils is replaced on-off, to drive metal slide bar
It pumps；
Striking head is fixedly connected on the metal slide bar end of electromagnetic hammer, taps measured object repeatedly with metal slide bar, is tested
Deformation occurs under the active force of striking head and generates screen resilience for object, and piezoelectric transducer, piezoelectric sensing are contained inside striking head
Device detects screen resilience, and screen resilience is converted into knocking and is output to conditioning circuit.
The driving circuit includes first input port, the second input port, two resistance R1 and R2, two triode Q1
And Q2, first input port and the second input port are separately connected one end of resistance R1 and R2, resistance R1 and R2 other end difference
The collector of the base stage of connection Q1 and Q2, Q1 and Q2 are separately connected the first electromagnetic coil L1 and the second electromagnetic coil in electromagnetic hammer
The emitter of L2, Q1 and Q2 are grounded.
The conditioning circuit includes operational amplifier INA118, comparator LM393, resistance R1, R2, R3, R4, R5, capacitor
C1；
The differential input end of operational amplifier INA118 is the input terminal of conditioning circuit, passes through resistance R1, resistance R2 respectively
It is pulled to reference level, negative power supply end ground connection, cathode power supply end connects power supply, and input reference end connects reference level,
One end of the output end connection R4 of operational amplifier, the other end of R4 are divided into two-way, connect capacitor C1, the other end of capacitor C1 all the way
Ground connection, another way are connected to the electrode input end of comparator LM393 as the output of signal；The cathode of comparator LM393 inputs
End connection reference level, negative power supply end ground connection, cathode power supply terminate power supply, and the output end of comparator is conditioning circuit
Output, is pulled to power supply by resistor R5.
The striking head is using the material package as made of resin and conductive metal powder solidification.
The conductive metal powder is tungsten powder.
The present invention has the beneficial effect that compared with prior art
(1) present invention using electric signal control electromagnetic hammer percussion campaign, can efficiently control tap hammer frequency with
Dynamics, will not be because excessively tapping damage detected member, and dynamics can control relatively uniform, taps frequency height, high reliablity.
(2) electromagnetic hammer is made using two electromagnetic coils and a metal slide bar in the present invention, passes through two-way driving current point
Not Kong Zhi electromagnetic coil replace on-off, realize metal slide bar reciprocating motion.Electromagnetic hammer on existing market is mainly by single electromagnetism
Coil and spring composition, when spring reset, is also easy to produce concussion and uncontrolled, for this electromagnetic hammer, according to this hair
Bright made electromagnetic hammer taps process and is controlled completely, has good detection effect.
(3) present invention forms material package using resin and metal powder solidification, the damping of striking head can be improved, effectively
Inhibit piezoelectric transducer intrinsic frequency to the influence of transmission result, output result is made to be mainly shown as piezoelectric transducer by acceleration
The forced vibration of shock loading.
(4) present invention taps mode using multichannel, taps detection compared to single channel, substantially increases percussion detection effect
Rate.
Detailed description of the invention
Fig. 1 is that multichannel of the present invention taps detection device schematic diagram；
Fig. 2 is electromagnetic hammer of the embodiment of the present invention and striking head structural schematic diagram；
Fig. 3 is that the embodiment of the present invention taps driving circuit figure.
Fig. 4 is electromagnetic hammer of embodiment of the present invention driving current schematic diagram；
Fig. 5 is conditioning circuit of embodiment of the present invention figure；
Fig. 6 (a) is that the embodiment of the present invention taps knocking schematic diagram when position is splicing good area；
Fig. 6 (b) is that the embodiment of the present invention taps knocking schematic diagram when position is unsticking region.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings and examples:
Fig. 1 is that a kind of multichannel of adhesive bonding of composites structure taps detection device schematic diagram.As shown, the multichannel
Tapping detection device includes driving circuit, conditioning circuit, N number of electromagnetic hammer and N number of striking head, and striking head and electromagnetic hammer one are a pair of
It answers, in which:
Driving circuit receives externally input control signal, generates the road 2N driving current signal, while exporting to N number of electricity
Magnetic hammer；
Conditioning circuit receives the knocking of N number of striking head acquisition, after amplifying, filter and comparing to knocking
It generates modulated signal and is output to external equipment；
Electromagnetic hammer, including two electromagnetic coils and a metal slide bar；Two electromagnetic coils are by the opposite hand of spiral point
It is not fixed on metal frame upper and lower ends, metal slide bar passes through among the electromagnetic coil of lower end, and upper end is fixedly connected with ferromagnetism material
Ferromagnetic block made of expecting, lower end are fixedly connected with striking head, and there are certain intervals between two electromagnetic coils, enable ferromagnetic block two
It is up and down between a electromagnetic coil；The two-way driving current signal that driving circuit is sent is respectively connected to two electromagnetic coils,
Electric current replaces on-off in two electromagnetic coils, and first electromagnetic coil generates magnetic force under the driving of first via current signal, inhales
Armature (iron) magnetic patch drives metal slide bar to move upwards, and second electromagnetic coil generates magnetic force under the driving of the second road current signal,
Attract ferromagnetic block that metal slide bar is driven to move downward, two-way driving current loop cycle is alternately present, to drive metal slide bar
It pumps；
Striking head is fixedly connected on the metal slide bar end of electromagnetic hammer, taps measured object repeatedly with metal slide bar, is tested
Deformation occurs under the active force of striking head and generates screen resilience for object, and piezoelectric transducer, piezoelectric sensing are contained inside striking head
Device detects screen resilience, and screen resilience is converted into knocking and is output to conditioning circuit.
Fig. 2 be the present embodiment electromagnetic hammer and striking head structural schematic diagram, as shown, electromagnetic hammer by two electromagnetic coils 1,
Ferromagnetic block 2 and a metal slide bar 3 are constituted, and two of them electromagnetic coil is separately fixed at metal frame 6 by the opposite hand of spiral
Upper and lower ends, ferromagnetic block 2 are fixed on metal slide bar upper end；Striking head, by piezoelectric chip sensor 4 and 5 groups of synthetic plastic tup
At striking head is fixed on the lower end of metal slide bar.The piezoelectric transducer 4 realized with piezoelectric chip, the striking head use by
Material package made of resin and conductive metal powder solidification, the conductive metal powder are tungsten powder.Percussion can be improved in this encapsulation
The damping of head effectively inhibits piezoelectric transducer intrinsic frequency to the influence of transmission result, and output result is made to be mainly shown as piezoelectricity
Forced vibration of the sensor by acceleration shock loading.
As can be seen from FIG. 3, the driving circuit include first input port (port1), the second input port (port2),
Two resistance R1 and R2, two triodes Q1 and Q2, first input port (port1) and the second input port (port2) are respectively
One end of resistance R1 and R2 are connected, resistance R1 connects the base stage of Q1 and Q2 with the R2 other end, and the collector of Q1 and Q2 are separately connected
The emitter of the first electromagnetic coil L1 and the second electromagnetic coil L2, Q1 and Q2 in electromagnetic hammer are grounded respectively, work as first input end
Mouthful (port1) input high level when the second input port (port2) input low level, is generated in the base-emitter of R1 and Q1
Electric current, the electric current generate electric current in Q1 collector after triode amplifies and flow through the first electromagnetic coil L1, the first electromagnetic coil L1
Magnetic force is generated after being electrified stream, base current is not present in the base-emitter of R2 and Q2 at this time, does not have electric current stream in Q2 collector
Magnetic force is not generated through the second electromagnetic coil L2, the second electromagnetic coil L2；First electromagnetic coil L1 attracts the iron block on slide bar upwards,
Striking head is driven to move upwards；When 1 input low level of input port, 2 input high level of input port, in the base of R1 and Q1
Electric current is not present in pole-emitter, does not have electric current to flow through the first electromagnetic coil L1 in Q1 collector, the first electromagnetic coil L1 is not generated
Magnetic force, the base-emitter of R2 and Q2 generates base current at this time, which generates electricity in Q2 collector after triode amplifies
Stream flows through the second electromagnetic coil L2, the second electromagnetic coil L2 and generates magnetic force, and the second electromagnetic coil L2 attracts downwards the iron on slide bar
Block drives striking head to move downward.
Driving circuit controls two electromagnetic coils by two-way driving current respectively and replaces on-off, realizes the past of metal slide bar
Multiple movement.Electromagnetic hammer on existing market is mainly made of single electromagnetic winding and spring, when spring reset be also easy to produce concussion and
It is uncontrolled, for this electromagnetic hammer, process is tapped according to electromagnetic hammer made by the present invention and is controlled completely, is had
There is good detection effect.Moreover, the frequency for tapping hammer can be efficiently controlled using the percussion campaign of electric signal control electromagnetic hammer
Rate and dynamics, will not be because excessively tapping damage detected member, and dynamics can control relatively uniform, and it is high, reliable to tap frequency
Property it is high.
The two-way input voltage signal on electromagnetic hammer is loaded, is two-way square-wave signal, the signal of input port 2 and input
Signal phase is on the contrary, when the signal of i.e. input port 1 is high level, and the signal of input port 2 is low level, input port 1
When signal is low level, the signal of input port 2 is high level.The magnetic force that electromagnetic coil generates by the electric current of coil by being determined
It is fixed, the percussion dynamics and percussion frequency of Electrical heads may be controlled by adjusting the voltage of input port.When the present embodiment can be long
Between work 20Hz tap frequency under.
In order to reduce the power consumption that multichannel taps detection device, electromagnetic coil fever is reduced, protection is played to electromagnetic coil
Effect, prolongs its service life.Before the electric current for discharging first electromagnetic coil, the signal that can control input port 1 first will
Voltage reduces, and is kept for a period of time, becomes low level again when the signal of input port 2 becomes high level.Such as Fig. 4 institute
Show, the input signal 1 of first port is the adjustable square-wave signal of a cycle, which includes three level, sequence according to
Secondary is respectively the level and low level of (4~5) V level, (3.5~4) V.The signal period of signal 2 is controlled with control signal 1, is somebody's turn to do
Signal includes two level, and sequence is followed successively by low level and high level (4~5) V level.Wherein high level action time and control
The low level effect moment of signal 1 processed and duration are equal.
Conditioning circuit includes operational amplification circuit, filter circuit and comparison circuit, and operational amplification circuit is used for will be external defeated
Output carries out low-pass filtering to amplified signal and eliminates letter to filter circuit, filter circuit after the knocking entered amplifies
Burr on number is exported later to comparison circuit, and comparison circuit is used to carry out filtered signal and preset reference signal
Compare, obtains square-wave signal and exported as modulated signal.
As can be seen from FIG. 5, in this example, conditioning circuit is by operational amplifier INA118, comparator LM393, resistance R1, electricity
R2, resistance R3, resistance R4, resistance R5, capacitor C1 is hindered to constitute, it is characterised in that:
The differential input end of operational amplifier INA118 receives the electric signal of piezoelectric transducer output, connects 2M pull-up electricity respectively
R1, resistance R2 to reference level (1.65V), negative power supply end ground connection are hindered, cathode power supply terminates power supply (3.3V), input ginseng
Examine end connection reference level (1.65V)；One end of the output end connection R4 of operational amplifier, the other end of R4 are divided into two-way, and one
Road meets capacitor C1, and the other end ground connection of C1, resistance R4 and capacitor C1 shaping filter, another way are connected to as the output of signal
The electrode input end of comparator LM393.
The negative input of comparator LM393 connects reference level (1.7V), negative power supply end ground connection, cathode power supply termination
Power supply (3.3V), the output end of comparator are the output of conditioning circuit, are pulled to power supply by resistor R5
(3.3V)。
Striking head, which taps, is glued good area and unsticking region, and contact force, time of contact are different, in pressure built in striking head
Electric transducer perceives the size of time of contact, and by the electric signal pulse width of measurement piezoelectric transducer output, testing product is
It is no that there are debonding defects.As can be seen from FIG. 6, the knocking of output is square-wave signal, when tapping position splicing good area,
The electric signal pulse of output is narrow, as shown in Fig. 6 (a)；When tapping position is unsticking region, the electric signal pulse of output is wide, such as
Shown in Fig. 6 (b).
The tested geodesic structure that the present invention is applicable in has: honeycomb cementing structure, foamed sandwich structure, plate plate cementing structure.It is suitble to
Tap skin thickness range :≤1.5mm.
The above, optimal specific embodiment only of the invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (4)
1. a kind of multichannel of adhesive bonding of composites structure taps detection device, it is characterised in that including driving circuit, conditioning electricity
Road, N number of electromagnetic hammer and N number of striking head, striking head and electromagnetic hammer correspond, N >=1, in which:
Driving circuit receives externally input control signal, generates the road 2N driving current signal, while exporting to N number of electromagnetic hammer；
Conditioning circuit receives the knocking of N number of striking head acquisition, knocking is amplified, filter and after generate
Modulated signal is output to external equipment；
Electromagnetic hammer, including two electromagnetic coils, magnet block and metal slide bar；Two electromagnetic coils are distinguished by the opposite hand of spiral
Metal frame upper and lower ends are fixed on, metal slide bar passes through among the electromagnetic coil of lower end, and upper end is fixedly connected with ferrimagnet
Manufactured ferromagnetic block, lower end are fixedly connected with striking head, and there are certain intervals between two electromagnetic coils, enable ferromagnetic block at two
It is up and down between electromagnetic coil；The two-way driving current signal that driving circuit is sent is respectively connected to two electromagnetic coils, and two
Road driving current loop cycle is alternately present, and so that electric current in two electromagnetic coils is replaced on-off, to drive metal slide bar or more
It moves back and forth；
Striking head is fixedly connected on the metal slide bar end of electromagnetic hammer, taps measured object, measured object repeatedly with metal slide bar
Deformation occurs under the active force of striking head and generates screen resilience, and piezoelectric transducer, piezoelectric transducer inspection are contained inside striking head
Screen resilience is converted into knocking and is output to conditioning circuit by survey time elastic force；
The driving circuit include first input port, the second input port, two resistance R1 and R2, two triode Q1 and
Q2, first input port and the second input port are separately connected one end of resistance R1 and R2, and resistance R1 and the R2 other end connects respectively
Connect the base stage of Q1 and Q2, the collector of Q1 and Q2 are separately connected the first electromagnetic coil L1 and the second electromagnetic coil in electromagnetic hammer
The emitter of L2, Q1 and Q2 are grounded.
2. a kind of multichannel of adhesive bonding of composites structure according to claim 1 taps detection device, it is characterised in that
The conditioning circuit includes operational amplifier INA118, comparator LM393, resistance R1, R2, R3, R4, R5, capacitor C1；
The differential input end of operational amplifier INA118 is the input terminal of conditioning circuit, is pulled up respectively by resistance R1, resistance R2
To reference level, negative power supply end ground connection, cathode power supply end connects power supply, and input reference end connects reference level, operation
One end of the output end connection R4 of amplifier, the other end of R4 are divided into two-way, connect capacitor C1, another termination of capacitor C1 all the way
Ground, another way are connected to the electrode input end of comparator LM393 as the output of signal；The negative input of comparator LM393
Reference level, negative power supply end ground connection are connected, cathode power supply terminates power supply, and the output end of comparator is the defeated of conditioning circuit
Out, power supply is pulled to by resistor R5.
3. a kind of multichannel of adhesive bonding of composites structure according to claim 1 taps detection device, it is characterised in that:
The striking head is using the material package as made of resin and conductive metal powder solidification.
4. a kind of multichannel of adhesive bonding of composites structure according to claim 3 taps detection device, it is characterised in that:
The conductive metal powder is tungsten powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610499896.1A CN106198728B (en) | 2016-06-29 | 2016-06-29 | A kind of multichannel percussion detection device of adhesive bonding of composites structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610499896.1A CN106198728B (en) | 2016-06-29 | 2016-06-29 | A kind of multichannel percussion detection device of adhesive bonding of composites structure |
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| CN106198728B true CN106198728B (en) | 2019-01-25 |
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| CN201610499896.1A Active CN106198728B (en) | 2016-06-29 | 2016-06-29 | A kind of multichannel percussion detection device of adhesive bonding of composites structure |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632173A (en) * | 2018-06-22 | 2019-12-31 | 杨宗智 | Knocking detection device |
| CN109580780A (en) * | 2018-12-14 | 2019-04-05 | 天津工业大学 | Hand-held taps detector and detection method |
| CN113655120A (en) * | 2021-08-19 | 2021-11-16 | 上海建工集团股份有限公司 | Automatic knocking device and method for nondestructive testing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3797944A (en) * | 1972-11-08 | 1974-03-19 | Rohr Industries Inc | Non-destructive testing of acoustical honeycomb panels |
| CN102155968A (en) * | 2011-03-08 | 2011-08-17 | 陈益华 | Electromagnetic pushing-beating-type object-detecting device |
| CN102953379A (en) * | 2011-08-22 | 2013-03-06 | 周若愚 | Electromagnetic pile hammer |
| CN204116284U (en) * | 2014-10-27 | 2015-01-21 | 中国民航大学 | A kind of aircraft cellular structural composite material knocks and detects and non-destructive tests device |
-
2016
- 2016-06-29 CN CN201610499896.1A patent/CN106198728B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3797944A (en) * | 1972-11-08 | 1974-03-19 | Rohr Industries Inc | Non-destructive testing of acoustical honeycomb panels |
| CN102155968A (en) * | 2011-03-08 | 2011-08-17 | 陈益华 | Electromagnetic pushing-beating-type object-detecting device |
| CN102953379A (en) * | 2011-08-22 | 2013-03-06 | 周若愚 | Electromagnetic pile hammer |
| CN204116284U (en) * | 2014-10-27 | 2015-01-21 | 中国民航大学 | A kind of aircraft cellular structural composite material knocks and detects and non-destructive tests device |
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