CN85105453A - Ultrasonic non-destructive pipe testing system - Google Patents
Ultrasonic non-destructive pipe testing system Download PDFInfo
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- CN85105453A CN85105453A CN 85105453 CN85105453A CN85105453A CN 85105453 A CN85105453 A CN 85105453A CN 85105453 CN85105453 CN 85105453 CN 85105453 A CN85105453 A CN 85105453A CN 85105453 A CN85105453 A CN 85105453A
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Abstract
A flaw detection district inner tubal wall of measuring heat-exchange tube in the nuclear power steam generator loses the measuring system that subtracts scope, utilizes a ultrasonic unit to corkscrew in the pipe that is lost, and fills in this pipe with a kind of liquid (as water) so that hyperacoustic attenuation minimum.Be provided with the image that control device matches with ultrasonic unit and makes reaction flaw detection district's inner tubal wall thickness.
Description
The present invention relates to the checking system of tubular product, particularly be related to tube wall and in use stand to degrade those products with attenuate.Specifically.The present invention relates to the fault detection system of the weakened region of checking tube wall and the system of definite " loss " scope (the material volume of promptly scrapping).Simultaneously, the present invention can be used for checking the tubular product of any pattern, and is specially adapted to check the heat-exchange tube of nuclear power steam generator.
A nuclear power steam generator includes the spaced upright pipe of many pros, and their lower end puts in the tube sheet, and a liquid that heated from the nuclear reactor core circulation promptly circulates in these pipes.Simultaneously, secondary liquid (being so-called feedwater) is then in the pipe outer circulation, and will manage heat transferred in the interior liquid round the secondary liquid of pipe by heat interchange, makes a part of secondary liquid be converted into steam.
Sediment deposits inevitably from feedwater, and accumulates generation so-called " fouling " along shell.The chemical quality that this fouling has changed feedwater is corroding outer tube surface, thereby is causing local plaque, corrosion losses or the crackle of pipe.And because the result of pipe wear etc. reduces the mechanical stress of whole pipe.
The isolation with between radioactive liquid and secondary liquid in nuclear power steam generator is extremely important.Therefore means of testing in the prior art is the integrity that adopts the pipe of test generator.A kind of checking measure like this is that the probe of a sense faults is injected in the pipe, recalls it with a constant speed then.In leaning out pipe certain is partly during defectiveness, and then the employing way that adds sleeve pipe compensates, and also promptly adds to make pipe return to its normal heat-exchange capacity by auxiliary sleeve pipe whereby in defective pipe.
Usually testing conduit well is not to adopt eddy-current technique, sets up an electromagnetic field by a probe that is:, induces vortex flow thus on tube wall, detects with the sensor in the probe then.The size of eddy current changes with the unevenness on the tube wall.Thereby detect and characterize the pipe erosion of many types with eddy-current technique, for example crackle, plaque, wearing and tearing etc. are successful.Yet the result that this class technology draws when detecting size less than about 10% unevenness of pipe thickness is also unreliable.Thereby when must the feature of damaged tubular accurately being characterized, so that the performance that is characterized was estimated, eddy current testing method always can not meet the demands.For instance, accurately estimate the erosion or the wearing and tearing of pipe, i.e. tube wall attenuation degree, it needs data, i.e. the relevant data of material volume that lost with tube wall.Even polishing scratch is very shallow, this volume still may be considerable if the area that accounts for is very big.And eddy-current technique can not accurately detect and characterize for thin like that polishing scratch.
The present invention relates to a kind of improved pipe fault detection system, it is those shortcomings of existing fault detection system not, and have increased some advantages at structure and operating aspect.
Catalogue of the present invention be: provide a kind of and can detect and express the quite little pipe fault detection system of tube wall unevenness, comprise detecting change in size those defectives less than pipe thickness about 10% through improving; A fault detection system that utilizes ultrasonic technology to detect the tube wall attenuation is provided; Provide an aforementioned fault detection system that can produce enough data, with the material volume of determining to lose from tube wall; An aforesaid fault detection system is provided, and it can produce the tube wall that three-dimensional profile diagram is represented attenuation; And the improvement system that an aforementioned type is provided, it can make ultrasonic probe location and mobile on detected pipeline exactly.
Realization above and other purpose of the present invention is by providing such system to reach, and this system determines have much in the zone of deteriorating of the heat-exchange tube tube wall of nuclear power steam generator.This system includes: the ultrasonic unit of belt sensor and controller, sensor are launched ultrasound wave according to the control of controller and are accepted to be parallel to usually the reflection wave of emission shaft; With the drive unit that sensor couples mutually, be used for making sensor axis to mobile along the district of detecting a flaw in a pipe rotatably with become the width of cloth to penetrate axle with pipe to the width of cloth of arranging, consequently retouch out a spiral trajectory along tube wall; Controller, the ultrasound wave that response reflects back from the tube wall surfaces externally and internally, thereby the thickness signal of generation inditron wall thickness; Position signalling generating means, the axial and angle position of indication sensor in pipeline respectively; The treating apparatus of response thickness signal and position signalling was used for making around whole garden week, and along giving the pipe thickness figure of fixed axial length, thereby provide the pipe thickness figure of a pipe thickness weakened section.
For the ease of understanding the present invention, accompanying drawing shows a preferable embodiment, with reference to this figure, is readily appreciated that structure of the present invention, operation and many advantages in conjunction with following explanation.
Fig. 1 is the partial sectional view of the lower end of nuclear power steam generator container, and the fault detection system in the preferred embodiment of the present invention schematically is described;
Fig. 2 is the block scheme of a preferred embodiment of fault detection system among the present invention;
Fig. 3 is the amplification front view of control box in the preferred embodiment of the present invention;
Fig. 4 is the installation of explanation probe rackwork and the part longitudinal profile enlarged drawing of use-pattern;
Fig. 5 is the partial front cut-open view of the probe rackwork of Fig. 4, and container cover is removed;
Fig. 6 is the probe rackwork end face view of Fig. 5, counterclockwise rotation 90 °;
Fig. 7 is the sectional side view of the probe rackwork of Fig. 6, and a bottom side-looking and a part shell remove;
Fig. 8 is the facade view of the probe rackwork of Fig. 5;
Fig. 9 is the side-looking enlarged drawing of probe assembly;
Figure 10 is the top view of liquid coupling device;
Figure 11 is the part cutaway view Amplified image of Figure 10 device, takes from profile line 11-11;
Figure 12 is the part cutaway view Amplified image of Figure 10 device, takes from profile line 12-12;
Figure 13 A and 13B are the electric hookups of control and data processing circuit;
Figure 14 is the planimetric map of a centering ring of Fig. 9 probe assembly; And
Fig. 5 is the two-dimensional representation of one section transducer wall ' s abrasion being produced by the circuit of Figure 13 A and 13B, and is presented on the oscillograph in the control box.
Explain the fault detection system that characteristics constituted and implemented according to the present invention referring now to accompanying drawing 1～3, indicate with label 20.This fault detection system is specially adapted in the nuclear power steam generation station, in more detail, as shown in the figure, such steam generation station includes: a steam generator, its lower end be part spherical housing 22 and to have among one or more manhole 23(figure be one), can enter in cell 24 with the person who happens to be on hand for an errand.The top of a cell 24 entirely covers with a garden shape tube sheet 25, and many vertical holes are arranged on this tube sheet, and the lower end of many heat exchange tubes 26 promptly is inserted in these holes, only shows a wherein part among the figure.These pipes can be inverted U-shaped and be located at the top of tube sheet 25 so that carry out heat interchange with its make-up water on every side.
Every pipe 26 has garden cylindricality tube wall 27(and sees Fig. 4).As everyone knows, tube wall 27 its outside surfaces in use can form wall and decrease district 28 because of the erosion of friction and other type, cause tube wall 27 attenuation and injure pipe integral intensity.This fault detection system 20 promptly is a system that is used to check every pipe 26 and determines these transducer wall ' s abrasion degree.
With reference to Fig. 2, in general fault detection system 20 includes a control box 30, and this control box and plug connector 60 are coupled, and is used for driving ultrasonic probe assembly 40 and axially enters a relevant pipe 26.This control box 30 also comprises a ultrasonic thickness measurement unit 39, and it joins with plug connector 60 by cable 105 so that driving pulse is sent to probe assembly 40 and from receiving the signal of relevant tube wall 27 thickness send here.Also have control and data processing circuit 130 to be also included within the control box 30, it joins by cable 107 and plug connector 60, so as with driving electric be transferred to 60 and by the relevant probe assembly 40 of reception axially and angle position signal.Control and data processing circuit 130 are handled position and thickness signal from ultrasonic thickness measurement unit 39, and produce a thickness figure that shows the flaw detection district of tube wall 27 on oscillograph 31.
An air conduit 78 is connected to compressed air source in order to operate relevant cam locked assembly with plug connector 60, and this point is described as follows.To pass probe assembly 40 through the coupling liquid of conduits 120 and be charged to the pipe 26 from coupling liquid device 110, this coupling liquid device 110 be controlled by cable 129 by control and data processing circuit 130.Can be temporarily stored in the blattnerphone 158 from the data of probe assembly 40 and plug connector 60, and the signal that shows on oscillograph 31 also outputs in the X-Y plotter 159.For the shows signal with on the ultrasonic thickness measurement unit 39 on the oscillograph 31 is noted, an oscillography camera 170 and/or TV camera 171 also can be set and see Fig. 2) with blattnerphone 172(.
Refer again to Fig. 4 now, 5 and 9, on the figure probe assembly of working with thickness measure element 39, its whole label is 40.Probe assembly 40 includes an elongated tubular element 41(Fig. 9), it has one section expansion through section 42,42 are provided with the outlet opening 43 that radially leads to the outside, be provided with a groove 44 in order to installing ultrasonic sensor 45 in a side that expands through section 42, this sensor produces ultrasound wave and radially ultrasonic emitting is gone out by window 46.Removing expansion around tubular element 41 also has many at axial separation scraper 47 and the centering ring of alternately arranging 48 spaced apart from each other outside section 42.Centering ring 48 preferably has the shape (seeing Figure 14) that radially extended pliable teeth 49 forms roses, and its maximum outside diameter preferably is substantially equal to the internal diameter of the pipe 26 of being correlated with.Therefore, when probe assembly 40 was axially injected in the pipe 26, centering ring 48 will flexibly and slidably match with the inside surface of pipe 26, and kept the position of probe 40 coaxial with pipe 26 basically, saw that Fig. 4 is promptly clear.Expansion is smaller a little like the internal diameter of pipe 26 through the diameter of section 42.
The lower end of tubular element 41 is connected to a regulator 50(and sees Fig. 4 and Fig. 5).More particularly, regulator 50 has the end 51 of an internal thread, and the external thread of tubular element 41 lower ends connects P52 can be screwed into its (see figure 9).The lower end of regulator 50 is provided with a nose 53(Fig. 5), it is inserted in the end of relevant pliability hollow drive shaft 55, and forms the scalable connection, and 55 outer end then is plugged on the protruding junction surface 56 that is located on the regulator 57.As seen if necessary, utilize suitable regulator that several sections flexible drive shaft 55 are connected with each other, just can obtain the axle of desired random length.The tubular element 41 that reaches probe assembly 40 through flexible drive shaft 55 has an elongate cable 54, and an end and the sensor 45 of cable join.Preferably on cable 54, establish some terminal box 59(and see Fig. 5) obtain any needed length so that multistage cable 54 purpose on request linked together.Cable 54 transmits the signal of sensor 45 to and fro, also will carefully say below.Be provided with external thread male member 58 in the lower end of regulator 57.
Be installed in hangingly pedestal 61 opposite end be two cam gate valve assemblies, whole label is 70.Each cam gate valve assembly 70 includes a cylinder 71, wherein is provided with piston rod or guiding valve 72, and the respective openings on 72 processes of piston rod or guiding valve pedestal 61 protrudes upward.The diameter of guiding valve 72 is significantly less than the internal diameter of pipe 26, and a cone point 73 is arranged, so that be inserted in the pipe 26.What be trapped among guiding valve 72 outsides is an expansion sleeve 74, which is provided with some width of cloth to catch-hook 75.When guiding valve 72 was upward through expansion sleeve 74 and moves, catch-hook opened and makes it and the inside surface of corresponding pipe 26 moves (see figure 4) with friction mode.
So, in use these two cam gate valve assemblies 70 are just brought in the two tubes 26 by expansion sleeve 74, thereby the jail makes plug connector 60 be attached on the bottom surface of tube sheet 25 regularly.The positioning boss 76 that is located in the substrate 61 is engaged in and the suitable distance of its base plate maintenance the bottom surface of tube sheet 75 and plug connector 60.To match with the Guan Zhen of a constant pitch in the nuclear power steam generator of a concrete pattern by following plug connector as can be known 60.It is to arrange like this, after promptly cam gate valve assembly 70 installs, as shown in Figure 4, in pipe 26, also will explain below in the middle of it is fixed on plug connector 60 to be suitable for probe assembly 40 is inserted into.The pipe battle array that does not wait for pitch then adopts the unequal plug connector of spread length, and its cam gate valve assembly 70 has unequal spacing.Below will see clearly, cam gate valve assembly 70 will be seen Fig. 2 and Fig. 7 by conduit 78() and an auxiliary compressed air source coupling.
The upper end of axle 85 is provided with a connector 89, in order to a flexible hollow seal 90 to be installed.The external diameter of sealing is more much bigger than the internal diameter of relevant pipe 26, it rotationally with hollow tapped joint 91 couplings, joint 91 links to each other with axle 85 with the lower end with flexible driving shaft 55 with threaded engagement with the male contact of connector 57.So axle 85 is done axially and rotated when moving, also corresponding work of flexible driving shaft 55 and probe assembly 40 axially moved with rotation.
A spur gear 83 and a gear 92 engaged (Fig. 5 and Fig. 7) that is fixed on 93 of the circular encoders.This scrambler can be a pot, and it will produce the angle position signal indication of an axle 85 and sensor 45.Plug connector 60 also comprises a linear encoder 94(Fig. 7), this scrambler also can be the pot of a band slider, slider (not expression on the figure) fixes by a support 106 of axle 85 bands.So when axle 85 moved axially, slider also moved, so that scrambler 94 produces the axial location signal indication of an axle 85 and sensor 45.These signals from scrambler 93 and 94 are delivered to control and data processing circuit 130 by conductor 108 and 109 respectively through cable 107.The method will be described in more detail below.
Below axle sleeve 87, cover card 95 is round axle 85 and block axle, cover card 95 has suitable ring seal (not shown), cover card 95 extends through diapire 63 by suitable conduit (not shown) links joint 96, for the coupling liquid of fluid transfer coupling device 110 back and forth, joint 96 is equally also linked on the conduit 120.On the shaft part 85 in cover card 95 an eyelet (not shown) is arranged, coupling liquid is incorporated in the hollow tubular axis, this section conduit has sufficient length, to adapt to moving axially of axle 85.
By suitable several pneumatic conduit (see figure 8) by the joint in the diapire 63 with each cam gate valve assembly 70 link to each other with each conduit 97 (Fig. 5 and 7), successively, conduit 97 is linked an operation valve 98, operation valve 98 links to each other with valve 99, valve 99 is linked conduit 78 by suitable joint, leads to compressed air source (Fig. 2 and 7).Operation valve 98 is established a trigger switch 98a(Fig. 8 on diapire 63), in order to control selectively to which conduit 97 air supplies.When to conduit 97 air supplies, air is sent to the lower end of cylinder 71 in order to the elongation guiding valve, and when other conduit 97 air supplies, air is sent to the upper end of cylinder 71, and guiding valve is recalled.
The lower end of axle 85 links to each other with a collector ring 102 with socket 101 by a suitable contact maker 100, during axle 85 rotations, collector ring 102 keeps electric the contact with cable 54, and collector ring 102 is by being contained on the support 106 and can linking to each other with a connector 103 at the support 104 that it moves there.Connector 103 is by one section concentric cable 104a(Fig. 7) link the receptacle terminal 104b last (Fig. 5 and 8) in the rear wall 63, joint 104b connects cable 105 and leads to control box 30 then.The end of this section cable 104a is a matched impedance 105a(Fig. 5).This shows that various signals process concentric cable 105, cut cable 104a, collector ring 102 and cable 54 are in ultrasonic thickness measurement element 39 and 40 transmission of probe assembly.
Referring now to Figure 10-12,, liquid coupling device 110 comprises a similar box-like chest 111, chest 111 is established a removable cap 112, a reservoir vessel 113 is equipped with in the chest the inside, it can make plastic bottle or similar switch, the upper end of container 113 is provided with an opening, to hold a three-way connection 114.Conduit 115 extends near the bottom of container 113, by joint 114, up to the inlet of pump 116.Pump 116 is driven by pump motor 116a, and the outlet of pump 116 reaches in the threeway 118 by a conduit 117, and threeway 118 is linked conduit 120 through a joint 119 that covers in 112 successively, leads to plug connector 60.In order to prevent to flow backwards, preferably this pump is equipped with reverse checkvalve.
Another conduit 121 extends to the outlet of moving electromagnetic valve 122 from threeway 118, and conduit 123 is linked in valve 122 outlets, and conduit 123 extends to the bottom of container 113 by joint 114.Another conduit 124 extends to an exhaust joint 125 that covers on 112 from joint 114, in order to the air of amount discharge container 113.Also be provided with an electrical wiring post 126 at lid on 112, by this binding post 126 will with so that charged each conductor 128 of valve 122 with so that each conductor 127 that pump motor 116a switches on link to each other.These conductors 127 and 128 have constituted the part of the cable 129 that extends between the control of liquid coupling device 110 and control box 30 and data processing circuit 130.
In operation, when needs are transported to plug connector 60 with coupling liquid, valve-off 122, priming pump 116 is got to plug connector 60 with liquid from container 113.During UT (Ultrasonic Testing), stop pump 116, valve 122 is promptly protected to squeeze and is closed.In order to reclaim coupling liquid, open valve 122, rely on the gravity coupling liquid promptly to flow back in the container 113.
Referring now to Figure 13 A and 13B control and data processing circuit are described.In order to see circuit diagram, Figure 13 A and 13B should be engaged earlier.Control and data processing circuit 130 comprise buffer amplifier 131 and 132.Each buffer amplifier is preferably single gain work amplifier circuit, and the input of this amplifier links to each other respectively with from the next conductor 108 and 109 of the output place extension of rotary encoder in the plug connector 60 93 and linear encoder 94.A thickness indicator signal from ultrasonic thickness measurement element 39, supply with the double gain input end of double amplification totalizer 134 by conductor 133, the outside input end of totalizer 134 links to each other with the output of buffer amplifier 132, the output of totalizer 134 is added on the fixed contact of the C utmost point of a triple-pole double throw selector switch with b, C utmost point, more specifically say, selector switch L135 has one group of travelling contact 136a, 136b and 136c, first group of fixed contact 137a, 137b, 137c and second group of fixed contact 138a, 138b and 138c.When operate as normal, travelling contact 136a-c joins with fixed contact 137a-c respectively.
So as seen, when selector switch 135 was in normal position as Figure 13 a and 13b, the signal that comes from the horizontal level that is equivalent to sensor 45 of rotary encoder 93 was delivered to oscillographic level input through " b " of buffer amplifier 131 and switch 135 utmost point.Exclusive circuit 150 produces a closed venation simultaneously and dashes according to the angle position signal work of the sawtooth voltage that is produced by rotary encoder.This pulse is added to oscillograph 31 through switch 135 " a " utmost point, to eliminate the return line that oscillograph shows.From the expression sensor 45 of linear encoder 94 axially or vertical position signal, at first in totalizer with twice addition from the thickness signal of ultrasonic thickness measurement element 39, after " C " utmost point of switch 135 is added in the oscillographic vertical input.
For later use, position and thickness signal also are stored in the magnetic tape recorder 158 simultaneously.Like this, buffer amplifier 131 and 132 output and the thickness signal on the conductor 133 are added to respectively in the input of work amplifier circuit 140,141,142, and 140,141,142 lead-out terminal 143,144,145 is through cable 157(Fig. 2) respectively the input with blattnerphone 158 link to each other.
An importance of the present invention is that what to show on the oscillograph 31 is from the signal that is stored on the magnetic tape recorder 158, rather than directly comes the signal since plug connector 60 and 39 receptions of ultrasonic thickness measurement element.Like this, the travelling contact 136a-C of switching selection switch 135 just contacts with fixed contact 138a-C respectively.Contact 138C links to each other with the output of work amplifier totalizer 149, and 149 input links to each other with the output of amplifier circuit 147 with 148 of working respectively, and the latter's input end is the input end of double amplification.Contact 138b links the output terminal of work amplifier circuit 146; Contact 138 is linked the output terminal of exclusive circuit 151; 151 input links to each other with the output of work amplifier circuit 146; Work amplifier circuit 146,147,148 is linked in the output of magnetic tape recorder 158 respectively through conductor 161,162,163, and conductor 161,162,163 transmits angle and radial position signal and thickness signal respectively.Conductor 161,162,163 one-tenth see Fig. 2 in magnetic tape recorder 158 and control and data processing circuit 130() between the part of the cable 160 that extends.Being sent to the level of oscillograph 31 and vertical signal also can be sent to an X-Y by conductor 164 and 164a and paint (see figure 2) on the device 159.
Control and data processing circuit 130 also comprise a motor control circuit 152, and the lead-out terminal 153 on the circuit 152 is added to power supply on the gear motor 81 of the drive unit 80 in the plug connector 60 by cable 107.Motor control circuit 152 comprises bipolar, double-throw switch 35, this switch is contained in control box 30(and sees Fig. 3) header board on.Switch 35 deflection normal turn-off (OFF) positions and can moving up and down respectively move ahead (FWD) and reverse (REV) position, insert or withdraw from order to the rotation direction and the operation probe assembly 40 of control gear motor 81.
See Figure 15 now again, describe with reference to its work to check system 20.Figure 15 be a width of cloth on inspection 20 pairs of pipes of system 26 hinder the pipe of doing on oscillograph 31, to describe the flaw detection back in the district curve map that deteriorates.Plug connector 60 and relevant probe apparatus 20 are brought into 21 li of the cells of steam generator by manhole 23 by a staff, the remainder of check system is placed on the outside of a cell 21 of steam generator, for example in a corresponding monitoring trailer, link to each other by cable shown in Figure 20 with plug connector 60.
Routinely, the possible district of deteriorating reserves the position with other inspection technique on the tube wall.For given pipeline 26, choose the flexible driving shaft 55 of sufficient length, to enable to reach the predetermined flaw detection district of hindering the zone position vicinity of tube wall.When the flexible drive shaft of suitable length connects with axle 85, and when the not end of flexible driving shaft has been loaded onto probe apparatus 40, probe apparatus 40 is inserted in the selected pipe 26, and personnel selection advances it in pipe 26, enter pipe 26 up to whole length, then, artificially plug connector is upwards lifted, entered the pipe 26 of selection, be inserted into the position, upper end of axle 85, plug connector 60 location are so that the upper end of cam orientation expansion sleeve 74 is included into contiguous pipe 26 respectively, as shown in Figure 4.Be pressed over until positioning boss 76 on the basal surface of tube sheet 25, trigger switch 98a on the plug connector shell 62 promptly moves, and by the method known to top, pressurized air is conducted to the lower end of cam gate valve cylinder 71, guiding valve 72 elongations are opened catch-hook 75, and plug connector 60 is fixing tight at tube sheet 25 places.
This shows, when probe assembly 40 injects pipe 26, centering ring 48 flexiblely movably contacts with the inside surface of pipe 26, to keep the center of sensor 45 at pipe 26, simultaneously, sealing 90 engages slidably with the inside surface around the pipe is also flexible, thereby, a kind of slidably fluid tight envelope is provided.When probe assembly 40 injects pipes 26, sensor 45 location, so that it is by window 46 emission ultrasound waves with receive the reflection wave that is arranged essentially parallel to emission shaft, this emission shaft is substantially along the radial array of pipe 26.When the plug-in unit installation in position, the staff withdraws steam generator 21, and remaining flaw detection operation is to be undertaken by control box 30 remote controls.
The remote control staff at first drops into the switch 38 on the control box 30, makes control and data processing circuit 130 energisings, then, switch 36 and 37 is connected, and gives pipe 26 for coupling liquid.Generally, coupling liquid with lubricator or with the water of lubricant, because ultrasound wave must have the transmission media, and does not use water as media than the easier coupling of air, loss still less.Closing Switch 37, solenoid valve 122 cuts out, and runs jointly to close 36, and pump motor 116a is charged, pump 116 startings, so through conduit 115, pump 116, conduit 117, threeway 118, joint 119, conduit 120, joint 96, coupling liquid is thrown plug connector 60 into from storage container 113.Then, liquid is transported to around the sheath body 95 of axle 85 by a conduit in the plug-in unit shell 62, again by the respective openings on the axle 85 and mobile through the tubular element 41 of axle 85, flexible driving shaft 55 and probe assembly 40 thus, in excessive inlet pipe 26 of the outlet in the tubular element.Inject enough liquid in the pipe 26, promptly fill with fully from sealing 90 parts to the wound district of expection.In case pipe 26 is filled with sufficiently high liquid level, can stop the pump motor, because the unidirectional characteristic of pump, solenoid valve also cuts out thereupon, thus preventing that coupling liquid is reverse flows back in the container 113.
Then, formally carry out test of flaw detection.The staff upwards moves to the FWD position that moves ahead with selector switch 35, makes gear motor 81 energisings.Axle 85 rises gradually and enters in the pipe 26, extend fully until axle 85, preferably the length of flexible driving shaft 55 chooses, so that when plug connector 60 is located as the position of Fig. 4, flexible driving shaft 55 is fully extended in pipe 26, sensor 45 will be fixed on the upper end of hindering the district, just in time hinder the top of the position in district 28 at possible pipe.
If expect that is directly detected real-time results, selector switch 135 is placed on the normal position shown in Figure 13 A and the 13B, position and thickness signal are directly delivered on the oscillograph 31.If desired, also can deliver to X-Y plotter 159.Then, make ultrasonic thickness measurement element energising, in order to high voltage pulse is transferred to plug connector 60 by cable 105, and from being transferred to sensor 45 probe assembly 40 through cable 104a and 54 here.These pulses make sensor 45 launch a predetermined power and frequency, the width of cloth to the ultrasound wave that points to tube wall 27.
From all ultrasonic signal Returning sensors of the surfaces externally and internally of tube wall 27 reflection and convert electric signal to.This electric signal is transferred to ultrasonic thickness measurement element 39 along cable 54,104 and 105.Two reflected signals that come from the surfaces externally and internally of tube wall 27 in time separate mutually by the cycle that the thickness of tube wall 27 is directly proportional just.This ultrasonic thickness measurement unit 39 comprises a receiving loop, it converts the difference of two reflected signals to the magnitude of voltage of expression pipe thickness in time, and the magnitude of voltage of the expression pipe thickness on the conductor 133 is passed to (seeing Fig. 2 and 13b) control and data processing circuit 130.
Then begin flaw detection scanning, the staff pushes reverse position downwards with selector switch, make gear motor 81 charged, so that axle 85 falls back in the plug connector 60, because axle 85 just rotates on spirality ground, therefore describe one along the downward spiral trajectory of tube wall 27 from the ultrasound wave of sensor emission when recalling.Before being preferably in flaw detection work and beginning, check system 20 is finished proofreading and correct, make rotary encoder 93 and linear encoder 94 be in position, the upper left corner with respect to curve among Figure 15, it is zero that angle and axial translation represents in this position.To annotate on Figure 15 about following content and illustrate, transverse axis is represented angle and garden Zhou Weiyi, and on behalf of axle and perpendicular displacement, Z-axis add pipe thickness.The top of the corresponding pipe 26 in the top of figure, the bottom of the corresponding pipe in the bottom of figure.
Come the axial and angle position signal of spinning and linear encoder 93 and 94 to deliver to control and data processing circuit 130 through cable 107.By conductor angle position signal is added to buffer amplifier 131 input ends, 131 output is added to the input end of work amplifier 140, also is added to the horizontal input end of oscillograph 31 through " b " of switch 135 utmost point.The output of buffer amplifier 131 also is added on two work amplifiers of exclusive circuit 150, the work amplifier produces a block signal, be added to the locking input end of oscillograph 31 by " a " utmost point of selector switch 135, when sensor 45 has changeed 360 °, this exclusive circuit 130 promptly produces a closed venation and dashes, oscillograph 31 is provided the locking to flyback.The axial location signal is added to the input end of work amplifier 132 by conductor 109, the output of amplifier 132 is sent to the input of totalizer 134, another input of totalizer has 2 multiplication benefits, be from being added on the conductor 133, thickness signal from thickness measure element 39, the thickness signal of shaft position signal and twice is being represented in the output of totalizer 134, is added in the vertical input of oscillograph 31 through " C " of selector switch 135 utmost point.
Referring to Figure 15, De Gui Trace represents that the thickness of tube wall 27 normal not attenuates moves from left to right on the top of screen on the oscillograph screen, and ， Gui Trace will be a series of straight lines as long as thickness remains unchanged.Every straight line explanation sensor 45 rotates one 360 °, and the axial internal clearance of interval representative sensor 45 when becoming commentaries on classics between the straight line.And oscillograph has illustrated De Gui Trace line 166 and is horizontal line basically, and this can do following simple declaration: in fact, these Gui Trace lines from left to right slightly tilt downwards, so that the left hand end of every Tiao Gui Trace is identical with formerly right hand end De Gui Trace level.Oscillograph 31 is a kind of memory-scopes, so Gui Trace can maintain on screen, watches its entire curve 165 to allow the long period.
Run into the zone of tube wall 27 thickness attenuation when ultrasonic beam, 167 represented downward-sloping situations can appear in oscillograph Gui Trace, the value of the vertical extent direct ratio main wall attenuate of this inclination, 28 the degree of depth of promptly deteriorating, the horizontal extent of inclination are proportional to the garden week scope of deteriorating.So,, promptly obtain Figure 168 that a width of cloth describes to hinder district 28 on the oscillograph screen when sensor 45 moves in whole wound district when finishing.Referring to the example of Figure 15, the wound district that draws is: the degree of depth increases from the top to bottom gradually, and the erosion of top wound district is D deeply
1, and the bottom erosion is D deeply
2, hindering the maximum garden Zhou Kuandu in district is H, its vertical or axial range is V.Hinder district's erosion and be exaggerated deeply, because the thickness amplitude has been amplified one times at the input end of totalizer 134, so that the situation of deteriorating of easier its tube wall of observation.
Also can change oscillographic view into data representation, its data also can be recorded on the magnetic tape recorder 158, as later observation and further processing usefulness.At this, it may be noted that, in order to be suitable for the input range of magnetic tape recorder 158, be generally ± 8 volts, thickness voltage on the output of each buffer amplifier and the conductor 133 also is added to work amplifier 140,141 and 142 respectively, to amplify and position voltage value correction angle and axial and thickness magnitude of voltage.Then, work amplifier circuit 140,141 and 142 output are added to the input end of magnetic tape recorder through cable 157.
During the data that on will showing oscillograph 31, store, with selector switch 135 to the tape location that moves down into it, on that position, travelling contact 136a-C contacts with fixed contact 138a-C respectively, and sound-track engraving apparatus 158 comprises conductor 161,162 and 163 through cable 160(), transmit and be loaded with angle and the axial position signalling and the storage data of thickness signal respectively.Running plays out stored data.These signals are added to the input of work amplifier circuit 146,147 and 148 respectively, and the design department of this circuit 146,147,148 is in order to guarantee the making data voltage value of storage identical with raw data.The output of amplifier circuit 146 is added to the horizontal input end of oscillograph 31 through " b " of selector switch 135 utmost point, also be added on each amplifier of exclusive circuit 151, with top the same manner of being introduced about exclusive circuit 150, the amplifier of this exclusive circuit 150 produces the flyback closed venation and dashes, and is added to oscillographic locking input end through " a " of switch 135 utmost point.The output of amplifier circuit 147 is added to an input end of totalizer 149, and another input end of totalizer 149 is accepted the output of amplifier circuit 148.Totalizer 149 has identical functions with totalizer 134, and its output is added to oscillographic vertical input end through " C " of switch 135 utmost point.
When flaw detection finishes, switch 35 is retracted the OFF position, make the gear motor outage, at this moment axle 85 positions that should withdraw from fully.If detect a flaw by anti-order, i.e. axle 85 spiral advancing that make progress.Before plug connector 60 was out of service, axle 85 can't withdraw from.Then, step switch 37, cut off solenoid valve 122 power supplys, make coupling liquid rely on gravity, be expelled back in the container 113 from outlet 43, tubular element 41, flexible driving shaft 55, driving shaft 85, support 95, conduit 120, valve 122 and the conduit 123 of pipe 26 through probe assembly 40.When coupling liquid when pipe 26 and plug connector 60 discharged, open switch 38, to cut off control and data processing circuit 130 power supplys.
The staff reenters cell 24 then one time, drops into the toggle switch 98a on the connector housing 62, and cam guiding valve 72 is recalled, and then, removes plug connector 60 and related probe assembly 40 from tube sheet 25 and pipe 26.Regulate the length of flexible driving shafts 55 by adding or remove some sections, another that makes that it is suitable for the pipe 26 of being detected a flaw hindered district or other some pipes 26.Repeat above process again, plug connector 60 is contained in the position that the next one will be detected a flaw.
Shown curve on the oscillograph 31, as shown in figure 15, constitute the accurate three-dimensional pipe of the width of cloth figure that deteriorates, this simulation is shown as data translation a kind of form easily is provided, but if desired, can be with a terminal 175(Fig. 2) (or in real time or behind delay line) carry out Computer Analysis to data, and in order to produce the real three-D profile line chart of a width of cloth, this figure itself mainly is that the material volume to damage on the pipe 26 carries out instrumentation.For the data that receive from blattnerphone are handled, do such further data processing with a computer program, it will be datumization and be stored in data of noting in certain storer, reach out with certain language name word table, this data can be identified such as ranks, volume, steam generator number or the like.
The fault detection system of having found 20 can be told the pipe of 0.043 inch thin tube wall and be equivalent to 0.0005 inch dark tube wall erosion decrement, and this explanation the present invention can not detect 10% this point that the tube wall unevenness is less than pipe thickness reliably to previous system sizable improvement.
From as can be known noted earlier, a kind of improved fault detection system is provided here, this system utilizes ultrasonic technology, is characterized in highly sensitive, precision is high, and the accurate diagram that can provide pipe attenuation scope and deal with data is measured with the volume that material is deteriorated.
Application number 85105453
After the preceding revisal of the capable revisal of file name page or leaf
Instructions 16 ... at interval square ... square interval
2 22 ... the width of cloth is penetrated axle and is moved ... the width of cloth is penetrated axis and is moved
3 20 Fig. 5 ... Figure 15
3 24 ... as shown in the figure ... as shown in Figure 1
3 24 ... generator ... generator 21,
6 20 ... mode moves ... mode cooperates
7 16 ... internal diameter is much bigger ... internal diameter is big slightly
8 16 ... guiding valve ... guiding valve 72,
8 16 ... when other conduit 97 supplies ... one of pipe 97 acts as a guide
Give ... supply with
99 ... 122 outlet ... 122 inlet,
9 14 ... conductor 128 ... conductor 127
9 19 ... 122 promptly protect to squeeze ... 122 keep
11 5 ... travelling contact ... its travelling contact
11 11 ... 148 through conductor ... 148 input end is through conductor
11 16 ... paint device ... plotter
11 25 ... solenoid valve (leaving out)
11 26 ... solenoid valve 127 ... solenoid valve 122
12 1 and 128 ... (leaving out)
12 11 ... 26 hinder the district ... 26 flaw detection districts
12 12 ... the device 20 by ... the device 40 by
12 13 ... 21 li of cells ... 24 li of cells
Claims (15)
1, tube wall erosion of measuring heat-exchange tube in nuclear power steam generator measuring system of subtracting scope comprises: the ultrasonic unit that has sensing device and control device; Described sensing device responds the operation of this control device and launches ultrasound wave and receive the reflection wave that is basically parallel to emission shaft, it is characterized by: above-mentioned sensing device is subjected to the driving of drive unit and moves along selected flaw detection district in a pipe, and rotate with the emission axis that becomes radial array with pipe, so that make this emission shaft depict the spirality stitching along tube wall; Described control device responds the thickness signal that produces an inditron wall thickness from the ultrasound wave of the interior and outside surface reflection of tube wall; Produce the device of position signalling, be used for indicating respectively the axial and angle position of above-mentioned sensing device in pipe; And data processing equipment, be used to respond above-mentioned thickness and position signalling and produce the stitching that comprises the pipe thickness on its whole border along selected flaw detection district, draw this flaw detection district inner tubal wall thickness chart therefrom.
2, according to the system of claim 1, it is characterized by, described data processing equipment includes adder, is used for thickness signal is added to the axial location signal.
3, according to the system of claim 2, wherein said data processing equipment comprises for the amplitude of this thickness signal was put twice device before being added to this axial location signal.
4, according to the system of claim 2, also include display device, be connected to demonstrate the pipe thickness figure as the output of accepting above-mentioned angle position signal and above-mentioned adder.
5, according to the system of claim 2, also include memory storage, be used to store above-mentioned thickness and position signalling.
6, according to the system of claim 5, wherein said data processing equipment comprises: for thickness signal that will storage is added to second adder on the axial location signal of storage; The device on the display device of outputing to for the angle position signal that transmits this storage and second adder.
7, according to the system of claim 1, also include computer installation, the stored program operation of its nationality is carried out computing to described position and thickness signal and is produced the profile diagram of a three-dimensional, indicates area that tube wall deteriorates and the material volume of calculating loss therefrom.
8, according to the system of claim 2, it is characterized by, a container of storing coupling liquid is arranged, propagate with lower attenuation by its ultrasonic wave energy; For a certain amount of coupling liquid is delivered to the device in the pipe from said vesse, be full of this liquid around pipeline section of distinguishing in order to detecting a flaw and the sensing device, so that easily between sensing device and tube wall, transmit ultrasound wave; In order to produce the telltale of indicating the axial and angle position of sensing device in pipe respectively.
9, according to the system of claim 8, it is characterized by, described coupling liquid comprises water.
10, according to the system of claim 8, it is characterized by, described device for transmission usefulness includes, and a pump that drives liquid is so that be driven into coupling liquid in the pipe from container; A control coupling liquid flows to gate valve the container in managing.
11, according to the system of claim 10, further be characterized as, be provided with the device of control this pump and gate valve, this pump and gate valve are to be connected in parallel between this container and the pipe, when the pump operation time valve is closed, and gate valve when being opened pump stop to drive.
12, according to the system of claim 11, it is characterized by, the overall diameter of described tubular element is basically less than the interior diameter of the steam generator pipe of associated; This probe apparatus includes the centring means that is loaded on the tubular element, so that exactly this tubular element is positioned in the steam generator and coaxial with pipe.
13, according to the system of claim 12, it is characterized in that, above-mentioned centring means comprises: many resilient annular centring elements, they are installed on the described tubular element and are vertically separating mutually, and are processed to be slidingly matched with the steam generator tube wall and tubular element is positioned at center in the steam generator.
14, according to the system of claim 13, it is characterized by, described each centring element has many width of cloth to the elastic claw of outwards stretching out, and is arranged in the inside surface of relevant steam generator pipe to be slidingly matched.
15, according to the system of claim 14, also comprise the electrical cnnector that is arranged in above-mentioned driving shaft and the tubular element, be used to connect sensing device and control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105453 CN85105453A (en) | 1985-07-17 | 1985-07-17 | Ultrasonic non-destructive pipe testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105453 CN85105453A (en) | 1985-07-17 | 1985-07-17 | Ultrasonic non-destructive pipe testing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85105453A true CN85105453A (en) | 1987-01-21 |
Family
ID=4794486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85105453 Pending CN85105453A (en) | 1985-07-17 | 1985-07-17 | Ultrasonic non-destructive pipe testing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85105453A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458360C (en) * | 2003-03-07 | 2009-02-04 | 技术工业公司 | Method for inspection of metal tubular goods |
| CN102077197A (en) * | 2008-06-30 | 2011-05-25 | Bp北美公司 | Rapid data-based data adequacy procedure for pipepline integrity assessment |
| CN104376885A (en) * | 2013-08-12 | 2015-02-25 | 中核核电运行管理有限公司 | Recycling device of light water coupling agent for supersonic inspection on heat transfer branch pipe of heavy water reactor power station |
| CN105806937A (en) * | 2014-12-30 | 2016-07-27 | 中核武汉核电运行技术股份有限公司 | Steam generator heat-transfer pipe ultrasonic inspection system |
| CN105806956A (en) * | 2014-12-30 | 2016-07-27 | 中核武汉核电运行技术股份有限公司 | Probe assembly used for ultrasonic inspection of heat-transfer pipe of steam generator |
| CN105823825A (en) * | 2016-03-29 | 2016-08-03 | 中北大学 | Belt ultrasonic detecting device |
| CN106840079A (en) * | 2017-01-03 | 2017-06-13 | 中华人民共和国南通出入境检验检疫局 | Tube groove angle measurement unit |
| CN106949860A (en) * | 2017-05-15 | 2017-07-14 | 山东省科学院激光研究所 | Inner-walls of duct detecting system and method |
-
1985
- 1985-07-17 CN CN 85105453 patent/CN85105453A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458360C (en) * | 2003-03-07 | 2009-02-04 | 技术工业公司 | Method for inspection of metal tubular goods |
| CN102077197A (en) * | 2008-06-30 | 2011-05-25 | Bp北美公司 | Rapid data-based data adequacy procedure for pipepline integrity assessment |
| CN102077197B (en) * | 2008-06-30 | 2015-03-25 | Bp北美公司 | Rapid data-based data adequacy procedure for pipepline integrity assessment |
| CN104376885A (en) * | 2013-08-12 | 2015-02-25 | 中核核电运行管理有限公司 | Recycling device of light water coupling agent for supersonic inspection on heat transfer branch pipe of heavy water reactor power station |
| CN105806937A (en) * | 2014-12-30 | 2016-07-27 | 中核武汉核电运行技术股份有限公司 | Steam generator heat-transfer pipe ultrasonic inspection system |
| CN105806956A (en) * | 2014-12-30 | 2016-07-27 | 中核武汉核电运行技术股份有限公司 | Probe assembly used for ultrasonic inspection of heat-transfer pipe of steam generator |
| CN105806937B (en) * | 2014-12-30 | 2019-04-16 | 中核武汉核电运行技术股份有限公司 | A kind of steam generator heat-transfer pipe ultrasonic examination system |
| CN105806956B (en) * | 2014-12-30 | 2019-08-13 | 中核武汉核电运行技术股份有限公司 | A kind of probe assembly of steam generator heat-transfer pipe ultrasonic examination |
| CN105823825A (en) * | 2016-03-29 | 2016-08-03 | 中北大学 | Belt ultrasonic detecting device |
| CN106840079A (en) * | 2017-01-03 | 2017-06-13 | 中华人民共和国南通出入境检验检疫局 | Tube groove angle measurement unit |
| CN106840079B (en) * | 2017-01-03 | 2018-12-18 | 中华人民共和国南通出入境检验检疫局 | Tube groove angle measurement unit |
| CN106949860A (en) * | 2017-05-15 | 2017-07-14 | 山东省科学院激光研究所 | Inner-walls of duct detecting system and method |
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