CN109975410A - A kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection scanning mode - Google Patents
A kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection scanning mode Download PDFInfo
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- CN109975410A CN109975410A CN201910186643.2A CN201910186643A CN109975410A CN 109975410 A CN109975410 A CN 109975410A CN 201910186643 A CN201910186643 A CN 201910186643A CN 109975410 A CN109975410 A CN 109975410A
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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
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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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
- G01N29/22—Details, e.g. general constructional or apparatus details
Abstract
The present invention relates to ultrasonic phase array detection techniques, it is desirable to provide a kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection scanning mode.Include: the width for measuring the single crimping of hot melting connector, inputs detection host as scanning length, detection parameters then are set on detection host；The delay rule for calculating the scanning of constant depth spacing or fixed angle spacing scanning, so that focus is entirely located in docking detection plane: focusing length calculates；Scanning angle and delay rule calculate；Change scanning line focus depth, repeat scanning angle and calculating, until the depth of focus is greater than scanning and terminates depth, scanning postpones rule；Detect defect imaging.The all standing of detection zone, sensitivity with higher and resolving power can be achieved in the present invention.Only mobile probe can realize tool joint monitor when actually detected, it is not necessary to repeatedly adjust the depth of focus.The setting of scanning procedure parameter is convenient, greatly improves detection efficiency, convenient for the realization that detection is intelligent and automates.
Description
Technical field
The present invention relates to plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection techniques, and in particular to a kind of plastic conduit
Butt-fusion welded joint ultrasonic phase array detects scanning mode.
Background technique
Compared with conventional metals pipeline, plastic conduit has that corrosion-resistant, anti-seismic performance is good, long service life and environmentally protective etc. excellent
Point has the use experience of many decades in fields such as combustion gas, plumbing, starts to be applied to Nuclear Power Plant water delivery system in recent years
Occasions, the application prospects such as system are very wide.The connection type of plastic conduit mainly has hot-melt adhesive paste to connect with electric smelting, hot-melt adhesive paste
Additional attachment is not needed, cost is relatively low, connects strong applicability for big-diameter pipeline, DN90 above plastic conduit in China is big at present
Heat-melting butt-joint is mostly used to weld.In the welding process, it due to factors such as welding surroundings, welding procedure and personnel operations, is heating
Defect easy to form at banjo fixing butt jointing, influences the safety of pipe-line system, needs to identify inside connector by nondestructiving detecting means
Defect.In many nondestructiving detecting means, ultrasonic phase array detection have many advantages, such as it is convenient, intuitive, safe, be plastic conduit without
Damage the prefered method of detection.
Typical ultrasonic phase array detector includes detection host and phased array probe, and phased array probe is by multiple array element groups
At each array element can independent transmission and reception ultrasonic wave.Detecting host can be according to focal position computing relay rule realization sound
Beam focuses, and keeps focal position sound stronger, defect reflection echo intensity is also just higher.Detect host by change focal position or
The mobile focused beam in aperture is activated, realizes that the scanning to structure can be according to the position of scanning line after obtaining a plurality of scanning line signal
Relationship is imaged, and defect is visualized.The linear scanning of general scanning mode and sector scan, are widely used in super
In sound phased array detection device.
In heat-melting butt-joint welding, crimping generation is had at plastic pipe joint, weld metal zone is located at below crimping.Due to volume
The limitation on side directly can not detect plastic pipeline hot melt banjo fixing butt jointing using linear scanning, need to use sector scan.Such as Fig. 1 institute
Show, sector scan focused radius is fixed, i.e. each scanning line focus position is identical at a distance from center probe, can calculate fan accordingly
Delay rule needed for shape scanning, excitation phased array emit ultrasonic wave, realize the sector scan to hot melting connector.Though sector scan
Acoustic beam covering detection plane can so be made, but since focused radius is fixed, scanning line focus can not be entirely located in heat-melting butt-joint inspection
Plane is surveyed, so that detection sensitivity and resolving power can not be made best.
Consider that the design feature of butt-fusion welded joint and the convenience of ultrasonic phase array detection, the present invention propose a kind of plastics
Pipe hot melting banjo fixing butt jointing ultrasonic phase array detects scanning mode, is closed according to the position that hot melting connector docks plane and center probe
It is computing relay rule, is entirely located in scanning line focus in detection plane, as shown in Figure 2.The present invention can be such that ultrasonic wave is connecing
Head docking flat focus, improves detection position sound energy, and then improves the detection of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array
Sensitivity, resolving power and detection efficiency.
Summary of the invention
The technical problem to be solved by the present invention is to overcome deficiency in the prior art, provide a kind of plastic pipeline hot melt pair
Connector ultrasonic phase array detects scanning mode.
To solve the technical issues of facing, the technical solution adopted by the present invention is that:
A kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection checking method is provided, comprising the following steps:
(1) tool joint monitor prepares
It is detected host with ultrasonic phase array by the phased array probe that selection scanning frequency and plastic conduit thickness match
Connection；Couplant is coated near connector crimping, then places phased array probe；
(2) width for measuring the single crimping of hot melting connector inputs detection host as scanning length, is then detecting
Detection parameters are set on host；
(3) it calculates the scanning of constant depth spacing and postpones rule, focus is made to be entirely located in docking detection plane:
(3.1) focusing length calculates
According to scanning length and probe parameter, focusing length is calculated, i.e. docking plane is at a distance from center probe；
(3.2) scanning angle and delay rule calculate
For Mr. Yu bar scanning line, focus is located in docking plane, according to the depth of focal length pipeline external surface
Calculate focused radius and scanning angle；After obtaining focused radius, when calculating the delay of the current scanning line activation each array element in aperture
Between；Store current scanning linear array member delay time and scanning line angle degree；
(3.3) change scanning line focus depth, repeat step (3.2), until the depth of focus is greater than scanning and terminates depth, obtain
The constant depth spacing scanning obtained under current detection parameters postpones rule；
(4) defect imaging is detected
Phased array probe is motivated according to the delay rule that step (3) is calculated, so that focus is entirely located in docking detection flat
Face, and then improve the sound energy at docking plane；It detects host and defect imaging is carried out according to echo-signal and scanning line angle degree.
In the present invention, the detection parameters being arranged in abovementioned steps (2) include: to activate the array element number in aperture, constant depth
The scanning initial depth of spacing scanning mode, scanning terminate depth and scanning depth stepping.
The present invention also provides another plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection checking methods, including with
Lower step:
(1) tool joint monitor prepares
It is detected host with ultrasonic phase array by the phased array probe that selection scanning frequency and plastic conduit thickness match
Connection；Couplant is coated near connector crimping, then places phased array probe；
(2) width for measuring the single crimping of hot melting connector inputs detection host as scanning length, is then detecting
Detection parameters are set on host；
(3) it calculates the scanning of fixed angle spacing and postpones rule, focus is made to be entirely located in docking detection plane:
(3.1) focusing length calculates
According to scanning length and probe parameter, focusing length is calculated, i.e. docking plane is at a distance from center probe；
(3.2) scanning angle and delay rule calculate
To Mr. Yu bar scanning line, focus is located in docking plane, is focused according to focusing length and scanning line angle calculation
Radius；After obtaining focused radius, the delay time of the current scanning line activation each array element in aperture is calculated；Store current scanning linear array
First delay time and scanning line angle degree；
(3.3) change scanning line angle degree, repeat step (3.2), until scanning line angle degree is greater than scanning angle at the end, obtain
Fixed angle spacing scanning rule under current detection parameter；
(4) defect imaging is detected
Phased array probe is motivated according to the delay rule that step (3) is calculated, so that focus is entirely located in docking detection flat
Face, and then improve the sound energy at docking plane；It detects host and defect imaging is carried out according to echo-signal and scanning line angle degree.
In the present invention, the detection parameters being arranged in abovementioned steps (2) include: to activate array element number, the fixed angle in aperture
Scanning start angle, scanning angle at the end and the scanning angle stepping of spacing scanning mode.
In the present invention, in the step (1), first to the surface quality of plastic pipeline hot melt connector before coating couplant
It is checked, removes pipe surface spot.
In the present invention, in the step (1), after connecting phased array probe with ultrasonic phase array detection host, obtain
Array element width, array element gap and array element centre frequency.
In the present invention, in the step (4), for auxiliary detection, in the focusing length two sides of defect imaging map, setting is auxiliary
Detection line is helped, for marking welded seam area.
Compared with prior art, the solution have the advantages that:
Plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection scanning mode provided by the invention considers hot melting connector
Design feature, make scanning line focus be entirely located in docking plane on, and then improve docking plane on sound energy.Both inspection can be realized
The all standing for surveying region can also be achieved docking detection plane each point and all have higher sensitivity and resolving power.Actually detected
When only mobile probe can realize tool joint monitor, it is not necessary to repeatedly adjust the depth of focus.The scanning mode parameter setting is convenient, avoids
Sector scan need to adjust the inconvenience of the depth of focus and gain and acoustic beam focus simultaneously can not cover tool joint monitor plane comprehensively
Deficiency, detection efficiency is greatly improved, convenient for detection is intelligent and the realization of automation.
Detailed description of the invention
Fig. 1 is that hot melting connector ultrasonic phase array detects sector scan mode in routine techniques；
Fig. 2 is that hot melting connector ultrasonic phase array provided by the invention detects scanning mode；
Fig. 3 is plastic pipeline hot melt connector ultrasonic phase array detection device schematic diagram；
Fig. 4 is scanning mode Computing Principle provided by the invention；
Fig. 5 is the delay rule calculation flow chart of constant depth spacing scanning mode provided by the invention；
Fig. 6 is delay rule schematic diagram calculation；
Fig. 7 is the delay rule calculation flow chart of fixed angle spacing scanning mode provided by the invention；
Fig. 8 is the test map that fixed angle spacing mode scanning provided by the invention obtains；
Fig. 9 is the test map that sector scan detects hot melting connector in routine techniques.
Appended drawing reference: 1 plastic conduit, 2 hot melting connectors, 3, phased array probe, 4 ultrasonic phase arrays detect host；
Specific embodiment
Plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array of the present invention detects scanning mode, is used for plastic pipeline hot melt
The non-destructive testing of banjo fixing butt jointing.
As shown in figure 3, plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection device includes plastic conduit 1, thermal welding
First 2, phased array probe 3, ultrasonic phase array detect host 4.To detect plastic conduit heat using scanning mode provided by the invention
Molten banjo fixing butt jointing inputs detection parameters on ultrasonic phase array detection host 4, and ultrasonic phase array detects host 4 according to the present invention
Calculation method is provided and obtains delay rule for motivating phased array probe 3.Phased array probe 3 can launch ultrasonic wave through coupling
Mixture layer enters hot melting connector 2, with receives echo-signal and can be transmitted to ultrasonic phase array detection host 4.Ultrasonic phase array
The number of scanning line evidence that the processing transmission in real time of host 4 comes is detected, defect imaging is carried out.
The step of specific detection method, is as follows:
(1) tool joint monitor prepares
It checks the surface quality of plastic pipeline hot melt connector 2, removes near joints pipe surface spot, avoid influencing ultrasound
Phased array detection.The phased array probe 3 that suitable frequency is selected according to duct thickness connect with detection host 4, obtains array element width
W, array element gap g and array element centre frequency f.Couplant is coated near 2 crimping of plastic conduit banjo fixing butt jointing, is placed phased array and is visited
First 3.
(2) detection parameters are arranged
Measure scanning length lt, i.e., the width of the single crimping of hot melting connector, input detect the setting options of host, and are arranged
Activate the array element number N in aperture and the scanning scope of scanning mode.
The present invention provides two kinds of checking methods, the i.e. scanning of constant depth spacing and fixed angle spacing scanning.Such as selection
Scanning initial depth z need to be arranged in constant depth spacing scanningmin, scanning terminate depth zmaxWith scanning depth stepping δ z, set up
At rear according to step (3) computing relay rule.Fixed angle spacing scanning is such as selected, needs to be arranged scanning start angle θmin, sweep
Look into angle at the end θmaxWith scanning angle stepping δ θ, foundation step (4) computing relay rule after being provided with.
(3) constant depth spacing scanning delay rule calculates
Scanning mode Computing Principle is as shown in figure 4, calculation process is as shown in Figure 5.To make focus be entirely located in docking detection
Plane, the calculating that constant depth spacing scanning postpones rule are realized by following steps:
Step A, focusing length calculates
According to scanning length and probe parameter, focusing length F can be calculatedx, that is, plane is docked at a distance from center probe,
Such as formula (1):
Step B, scanning angle and delay rule calculate
For originating scanning line, it is z=z apart from pipeline external surface depth that focus, which is located in docking plane,min, accordingly may be used
Focused radius F and scanning angle, θ are calculated, such as formula (2) and formula (3):
θ=arctan (Fx/z) (3)
After obtaining focused radius F, as shown in fig. 6, the delay time of the current scanning line activation each array element in aperture can be calculated,
Such as formula (4):
Wherein τiFor the delay time of the i-th array element；liIndicate the distance between i-th of array element and focus；F is focused radius；
c0For the velocity of sound；τ0For time constant, to avoid there is negative delay time.
Store current scanning linear array member delay time TiWith scanning line angle, θ, array element delay time is for motivating phased array
Probe 3 emits and receives sound wave, and scanning line angle degree is used for according to echo-signal reconstructed image.
Change scanning line focus depth z=zmin+ δ z repeats step B, until depth of focus z is greater than scanning and terminates depth
zmax, can get the delay rule under current detection parameter.
(4) fixed angle spacing scanning delay rule calculates
Scanning mode Computing Principle is as shown in figure 4, calculation process is as shown in Figure 7.Fixed angle spacing scanning postpones rule
Calculating can be realized by following steps:
Step A, focusing length calculates
According to scanning length and probe parameter, focusing length F can be calculatedx, that is, plane is docked at a distance from center probe,
Specific calculation is referring to formula above-mentioned (1).
Step B, scanning angle and delay rule calculate
For originating scanning line, focus is located in docking plane, and scanning line angle degree is θ=θmin, focusing can be calculated accordingly
Radius F, such as formula (5):
F=Fx/sin(θ) (5)
After obtaining focused radius F, the delay time of the current scanning line activation each array element in aperture can be calculated by formula (4),
Store current scanning linear array member delay time TiWith scanning line angle, θ.
Change scanning line angle, θ=θmin+ δ θ repeats step B, until scanning line angle, θ is greater than scanning angle at the end θmax,
It can get the delay rule under current detection parameter.
(5) defect imaging is detected
Phased array probe 3 is deactivated with the delay rule that step (3) or step (4) are calculated, focus whole position can be made
Plane is detected in docking, and then improves the sound energy at docking plane.Ultrasonic phase array detects host 4 according to echo-signal and scanning
Line angle, θ carries out defect imaging.It is detected for auxiliary, in test map focusing length FxAuxiliary detection line, two auxiliary are arranged in two sides
Between line be object detection area, by observe the region whether have abnormal image show can determine that connector inside whether there is
Defect.
Embodiment:
The plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection scanning mode provided according to the present invention, with fixed angle
For spacing scanning mode, big wall thickness polyethylene pipe hot melt banjo fixing butt jointing is detected, technical effect of the invention is verified.
The segment pipe wall thickness is up to 110mm.Heat-melting butt-joint seam width about 10mm.The phased array ultrasonic detection instrument of certain company production, tool
There are sector scan and linear scanning both of which, while supporting host computer delay control.Phased array probe centre frequency 2.0MHz,
With 32 array elements, array element spacing 1.0mm, array element gap 0.1mm；Spread speed of the ultrasonic wave longitudinal wave in polyethylene is 2400m/
s.Fan-shaped scanning mode is respectively adopted in fixed angle spacing scanning mode provided by the invention and routine techniques to be detected.
Use fixed angle spacing scanning mode provided by the invention to be detected: scanning length is 10mm, i.e. thermal welding
Head curling thickness, using fixed angle spacing mode, scanning start angle is -89 °, and scanning angle at the end is -1 °, scanning angle
Stepping is 1 °.The test map such as Fig. 8 obtained according to the above parameter.
It is detected using sector scan mode used in the prior art, focused radius 30mm, scanning start angle
It is -89 °, scanning angle at the end is -1 °, and scanning angle stepping is 1 °.The test map such as Fig. 9 obtained according to the above parameter.
Comparison diagram 8 and Fig. 9 are it can be found that can detect that lacking at deeper position using scanning mode provided by the invention
It falls into, defect imaging effect is preferable, and detection sensitivity greatly improves.Scanning length only need to be given, is not necessarily to manual calculations focused radius,
It is more convenient to operate, and detection efficiency greatly promotes.
Claims (7)
1. a kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detects checking method, which comprises the following steps:
(1) tool joint monitor prepares
The phased array probe that selection scanning frequency and plastic conduit thickness match connects it with ultrasonic phase array detection host
It connects；Couplant is coated near connector crimping, then places phased array probe；
(2) width for measuring the single crimping of hot melting connector inputs detection host as scanning length, then in detection host
Upper setting detection parameters；
(3) it calculates the scanning of constant depth spacing and postpones rule, focus is made to be entirely located in docking detection plane:
(3.1) focusing length calculates
According to scanning length and probe parameter, focusing length is calculated, i.e. docking plane is at a distance from center probe；
(3.2) scanning angle and delay rule calculate
For Mr. Yu bar scanning line, focus is located in docking plane, according to the depth calculation of focal length pipeline external surface
Focused radius and scanning angle；After obtaining focused radius, the delay time of the current scanning line activation each array element in aperture is calculated；It deposits
Store up current scanning linear array member delay time and scanning line angle degree；
(3.3) change scanning line focus depth, repeat step (3.2), until the depth of focus is greater than scanning and terminates depth, worked as
Constant depth spacing scanning under preceding detection parameters postpones rule；
(4) defect imaging is detected
Phased array probe is motivated according to the delay rule that step (3) is calculated, focus is made to be entirely located in docking detection plane, into
And improve the sound energy at docking plane；It detects host and defect imaging is carried out according to echo-signal and scanning line angle degree.
2. the method according to claim 1, wherein the detection parameters being arranged in the step (2) include: activation
The array element number in aperture, scanning initial depth, scanning terminate depth and scanning depth stepping.
3. a kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detects checking method, which comprises the following steps:
(1) tool joint monitor prepares
The phased array probe that selection scanning frequency and plastic conduit thickness match connects it with ultrasonic phase array detection host
It connects；Couplant is coated near connector crimping, then places phased array probe；
(2) width for measuring the single crimping of hot melting connector inputs detection host as scanning length, then in detection host
Upper setting detection parameters；
(3) it calculates the scanning of fixed angle spacing and postpones rule, focus is made to be entirely located in docking detection plane:
(3.1) focusing length calculates
According to scanning length and probe parameter, focusing length is calculated, i.e. docking plane is at a distance from center probe；
(3.2) scanning angle and delay rule calculate
To Mr. Yu bar scanning line, focus is located in docking plane, according to focusing length and scanning line angle calculation focused radius；
After obtaining focused radius, the delay time of the current scanning line activation each array element in aperture is calculated；Current scanning linear array member is stored to prolong
Slow time and scanning line angle degree；
(3.3) change scanning line angle degree, repeat step (3.2), until scanning line angle degree is greater than scanning angle at the end, obtain current
Fixed angle spacing scanning rule under detection parameters；
(4) defect imaging is detected
Phased array probe is motivated according to the delay rule that step (3) is calculated, focus is made to be entirely located in docking detection plane, into
And improve the sound energy at docking plane；It detects host and defect imaging is carried out according to echo-signal and scanning line angle degree.
4. the method according to claim 1, wherein the detection parameters being arranged in the step (2) include: activation
Array element number, scanning start angle, scanning angle at the end and the scanning angle stepping in aperture.
5. the method according to claim 1, which is characterized in that in the step (1), coupled in coating
First the surface quality of plastic pipeline hot melt connector is checked before agent, removes pipe surface spot.
6. the method according to claim 1, which is characterized in that in the step (1), by phased array
After probe is connect with ultrasonic phase array detection host, array element width, array element gap and array element centre frequency are obtained.
7. the method according to claim 1, which is characterized in that in the step (4), detected for auxiliary,
Auxiliary detection line is set in the focusing length two sides of defect imaging map, for marking welded seam area.
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Cited By (1)
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| CN113358751A (en) * | 2021-06-01 | 2021-09-07 | 中车青岛四方机车车辆股份有限公司 | Workpiece defect detection method, device and system |
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