CN212301433U - Fir-tree type blade root high-efficiency detection device based on plane wave ultrasonic technology - Google Patents
Fir-tree type blade root high-efficiency detection device based on plane wave ultrasonic technology Download PDFInfo
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- CN212301433U CN212301433U CN202022204856.4U CN202022204856U CN212301433U CN 212301433 U CN212301433 U CN 212301433U CN 202022204856 U CN202022204856 U CN 202022204856U CN 212301433 U CN212301433 U CN 212301433U
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Abstract
The utility model relates to a fir-type blade root high-efficiency detection device based on a plane wave ultrasonic technology, which comprises a deconcentrator, a combined phased array ultrasonic probe and a combined phased array ultrasonic wedge block; the combined phased array ultrasonic probe consists of three sub-probes which are independently arranged in a parallel linear array; the interface at one end of the deconcentrator is connected with the combined phased array ultrasonic probe through a cable, and the probe at the other end and the instrument interface are connected with a phased array ultrasonic instrument; the three sub-probes are arranged on the combined phased array ultrasonic wedge block, the combined phased array ultrasonic wedge block is composed of three sub-wedge blocks, and each sub-probe corresponds to one sub-wedge block. The utility model has the advantages that: the utility model discloses use three independent parallel linear array arrangement sub-probe to constitute combined phased array ultrasonic probe, because the blade root defect that the installation deviation of scanning ware probe clamping device caused leaks to examine or detects the rework when avoiding manual detection because the deviation is placed to the probe when and automated inspection.
Description
Technical Field
The utility model relates to a fir type blade root detection device of large-scale thermoelectricity and nuclear power unit, concretely relates to fir type high-efficient detection device of blade root based on plane wave ultrasonic technology.
Background
The detection of the fir-tree blade root generally uses a conventional ultrasonic probe or a linear array arrangement phased array ultrasonic probe, and the detection of the whole blade root region is completed in a mode of detecting different regions of the blade root by a plurality of different probes. During conventional ultrasonic, transverse wave probes are used for carrying out detection from the inner cambered surface and the outer cambered surface of the blade respectively, and longitudinal wave probes are used for carrying out detection from shoulder areas on two sides of the blade.
The traditional phased array ultrasonic inspection scheme for fir tree blade roots uses multiple linear array probes. The linear array probe refers to that the wafers in the probe are all arranged on a straight line. During detection, the method is generally divided into 4 detection sequences, in the sequence 1, the phased array linear probe with the angle wedge block is placed on the blade extrados surface to detect the defect of the blade root extrados surface, and in the sequence 2, the phased array linear probe with the angle wedge block is placed on the blade intrados surface to detect the defect of the blade root extrados surface. And in the sequence 3, the phased array linear array probe with the angle wedge block is placed at the positions of shoulders at the two sides of the blade, which are close to the inner arc side, so that the defects of the outer arc surfaces at the two ends of the blade root are detected. And in the sequence 4, the wedge-free phased array linear array probe is placed at the positions of the shoulders at the two sides of the blade, which are close to the inner arc side, so that the defects of the inner arc surfaces at the two ends of the blade root are detected. In the traditional phased array ultrasonic detection scheme, each sequence uses an imaging mode of phased array ultrasonic sector scanning.
The conventional ultrasonic blade root detection has the advantages that because the probe angle of the conventional ultrasonic detection is single and fixed, the area covered by the sound beam is limited, the ultrasonic detection has the highest sensitivity when the sound beam is perpendicular to the defect and has the lowest sensitivity when the sound beam is parallel to the defect, and therefore, the only detection angle of the conventional ultrasonic detection is not sensitive to the defects with certain directionality. The conventional ultrasound adopts an A-type display imaging mode, only information such as signal amplitude, sound path and the like can be displayed in an image, signals can be displayed in partial structures besides defect signals due to the complex structure of a blade root in the detection process of the fir-tree blade root, and the signals are difficult to distinguish quickly and accurately due to the limitation of A-type scanning, so that the difficulty of defect identification in the detection process is increased. The bottom surface of a conventional ultrasonic probe is of a hard structure, and when the curved surface type blade body of the blade moves, poor coupling during detection can be caused due to the fact that the bottom surface of the probe is not tightly attached to the surface of the blade, and the quality of a detection signal is further influenced.
The traditional blade root phased array ultrasonic detection adopts a sector scanning imaging mode. Because the phased array ultrasonic probes arranged in a wafer linear array are used in the detection process, although the detection imaging of multiple angles can be realized by means of a fan-shaped scanning mode, the linear array phased array ultrasonic probes can only image in one plane and cannot realize three-dimensional imaging, if the probes are inclined to a certain degree when the scanning device is installed or a detector holds the probes by hands in the detection process, the probes actually emit sound beams and the sound beam directions required in the detection scheme deviate to a certain extent, and finally the defect omission detection can be caused. The bottom surface of a traditional phased array ultrasonic probe is of a hard structure, and when the curved surface type blade of the blade moves, the bottom surface of the probe is not tightly attached to the surface of the blade, so that the coupling is poor during detection, and the quality of a detection signal is influenced. In addition, the traditional phased array ultrasonic scanning is still based on an ultrasonic pulse reflection detection technology, a probe wafer used in the process of blade root detection is small, due to the reason of a blade root structure, the propagation distance of ultrasonic waves in a blade root is long and certain attenuation exists, the distance between a blade root defect echo and a blade root structure reflected wave is short, due to the limitation of a phased array ultrasonic fan scanning imaging algorithm and the property of instrument hardware performance, the signal to noise ratio of the phased array ultrasonic fan scanning imaging in the traditional blade root detection is poor, and the identification of some blade root tiny defects is influenced. Therefore, the prior art has the following problems:
1. the detection speed is slow, and the detection of the whole blade root part can be finished only by using a plurality of probes and a plurality of detection sequences;
2. during manual detection, the detection effect is greatly related to the operation method of a detector, and the detection missing caused by the fact that the operation method of the detector is not fine enough can be caused; during automatic detection, the progress of the scanner also has great influence on the reliability of a detection result;
3. the detection effect is influenced by the cambered surface curvature of the blade root and the surface contact defect of the probe;
4. limited by an imaging method, the signal-to-noise ratio of the detected data is not high, and the identification of the tiny defects is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the prior art, providing a fir type blade root high-efficient detection device based on plane wave ultrasonic technology, detect fast and high-efficiently the fir type blade root of large-scale thermoelectricity and nuclear power unit.
The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology comprises a deconcentrator, a combined phased array ultrasonic probe and a combined phased array ultrasonic wedge block; the combined phased array ultrasonic probe consists of three sub-probes which are independently arranged in a parallel linear array; the interface at one end of the deconcentrator is connected with the combined phased array ultrasonic probe through a cable, and the probe at the other end and the instrument interface are connected with a phased array ultrasonic instrument; the three sub-probes are arranged on the combined phased array ultrasonic wedge block, the combined phased array ultrasonic wedge block is composed of three sub-wedge blocks, and each sub-probe corresponds to one sub-wedge block; the bottom of the combined phased array ultrasonic wedge block is provided with a flexible coupling layer capable of injecting water, and the flexible coupling layer is attached to the curved surface of the blade; a sub wedge block in the middle of the combined phased array ultrasonic wedge block is provided with a first inclination angle in the length direction; and the sub-wedges on two sides of the combined phased array ultrasonic wedge are provided with second inclination angles in the length direction, and the sub-wedges on two sides are also provided with third inclination angles in the width direction.
Preferably, the method comprises the following steps: one end of the deconcentrator is provided with three interfaces which are respectively connected with three sub-probes of the combined phased array ultrasonic probe through cables.
Preferably, the method comprises the following steps: the deconcentrator is provided with an operating button for selecting the excitation mode of the probe, and the operating button comprises a combined button and an independent button.
Preferably, the method comprises the following steps: the first and second inclination angles are the same and are both 36-39 deg.
Preferably, the method comprises the following steps: the angle of the third angle of inclination is 5-10 deg..
Preferably, the method comprises the following steps: the angle of the sub-wedges on the two sides of the combined phased array ultrasonic wedge in the width direction is in a mirror image relationship.
Preferably, the method comprises the following steps: and sound insulation materials are arranged on the side parts of the sub-wedges in the middle of the combined phased array ultrasonic wedge.
Preferably, the method comprises the following steps: and sound insulation materials are arranged on the lateral parts of the sub-wedges on the two sides of the combined phased array ultrasonic wedge.
The utility model has the advantages that:
1. the utility model discloses use three independent parallel linear array arrangement sub-probe to constitute combined phased array ultrasonic probe, because the blade root defect that the installation deviation of scanning ware probe clamping device caused leaks to examine or detects the rework when avoiding manual detection because the deviation is placed to the probe when and automated inspection.
2. This patent reduces the influence of coupling medium to data detection quality in the testing process through the mode that adopts flexible probe, reduces because the detection that causes of the reason of detecting data coupling quality reworks.
3. The utility model discloses a combined phased array ultrasonic probe has multiple usage pattern, improves the economic nature that the probe used.
Drawings
FIG. 1 is a schematic view of a sub-probe wafer arrangement;
FIG. 2 is a schematic view of a structure of a middle sub-wedge in the length direction;
FIG. 3 is a schematic view of a structure of a middle sub-wedge in the width direction;
FIG. 4 is a schematic view of a structure of two side sub-wedges in the length direction;
FIG. 5 is a schematic view of a structure of two side sub-wedges in the width direction;
FIG. 6 is a schematic structural diagram of a combined phased array ultrasonic wedge;
FIG. 7 is a schematic view of the probe mounted on the wedge;
FIG. 8 is a schematic view of a probe mode selection and splitter;
FIG. 9 is a schematic view of the probe head being connected to the splitter;
FIG. 10 is a schematic view of the probe mounted on the blade.
Description of reference numerals: the device comprises a first inclination angle 1, a sound insulation material 2, a flexible coupling layer 3, a second inclination angle 4, a third inclination angle 5, a sub-probe 6, a deconcentrator 7, a probe and instrument interface 8, a combined phased array ultrasonic probe 9, a combined button 10 and an independent button 11.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
The fir tree type blade root efficient detection device based on the plane wave ultrasonic technology uses three independent parallel linear array arrangement sub-probes to form a combined phased array ultrasonic probe, the recommended frequency of the probe is 7.5MHz, the signal to noise ratio of detection data is improved, other frequencies can also be adopted, the number of wafers of each linear array arrangement probe is 20, the distance between two wafers is 0.3mm, the width of each wafer is 0.2mm, and the length of each wafer is 5 mm. The probe is connected with a deconcentrator, one end of the deconcentrator is respectively pulled out of cable connection probes of the three independent probes and is connected with the probes through interfaces, and the other end of the deconcentrator is a main interface of the probes and is used for being connected with the phased array ultrasonic instrument. The deconcentrator is provided with an operating button for selecting the excitation type of the probe. The excitation modes of the probes are two, wherein one mode is that the three probes are combined into a probe with area array arrangement to be excited independently, and the other mode is that the three sub-probes are respectively used as independent probes to be excited. The detection scheme uses three sub-probes as independent modes excited by the independent probes respectively; the mode of combining into the area array arrangement needs to be matched with other wedges for use, and is mainly used for other detection applications.
This patent still includes a combined phased array supersound voussoir that can install three independent sub-probe simultaneously, and the voussoir bottom adopts semi-flexible structure, through the mode realization voussoir bottom surface at bottom water injection and the inseparable laminating of blade curved surface, and then guarantees the coupling quality among the testing process. The combined phased array ultrasonic wedge block is composed of three sub wedge blocks, the middle sub wedge block is provided with an inclination angle in the length direction, the range of the inclination angle is generally 36-39 degrees according to the requirement of blade specification, the sub wedge blocks on two sides are provided with an inclination angle in the length direction, and the size of the inclination angle is the same as that of the middle sub wedge block. The sub wedges on the two sides are also provided with an angle in the width direction, the size of the angle is generally between 5 degrees and 10 degrees, other angles can be changed according to the shape of the blade, and the angles of the sub wedges on the two sides in the width direction are designed into a mirror image relationship. The combined phased array ultrasonic wedge block has the structural advantage that the three wedge blocks are integrated together, so that the effect of respectively detecting the three sub wedge blocks before combination can be achieved through one-time detection, the detection time is shortened, and the detection efficiency is improved. The inclination angles on the middle sub-wedge and the two side sub-wedges are used for generating oblique sound beams.
In the detection process, different sub-probes are respectively excited in time-sharing mode in time difference mode to implement detection through programming in an instrument, and then three probes can realize detection of the to-be-detected region of the blade root from the blade body region through one-time scanning.
In the detection process, a plane wave imaging technology (plane wave image) based detection scheme is used for each sub-probe, and the accurate identification of the surface shape of the blade root and the rapid detection of the to-be-detected region of the blade root are realized by combining the blade root surface adaptive imaging technology. This scanning scheme comprises the following steps in implementation:
s1, manufacturing a detection process by using simulation software, wherein the content comprises information such as the range of plane wave imaging, the position of probe placement, the moving track and the like during detection; the resolution of the imaging is set to a value of 0.5mm or less.
And S2, placing the probe at a specific position on the blade body according to the detection process, and selecting the surface area of the blade from the detection image to restore the surface profile of the blade in the probe sound beam coverage range.
S3, selecting a to-be-detected area in the blade, and restoring a plane wave imaging signal in the to-be-detected area in the blade; if the intrados of the blade root is detected, the probe is generally placed on the extrados of the blade body, the extrados of the blade root is detected, the probe is generally placed on the intrados of the blade body, and the specific placement position is determined by using simulation software according to the blade structure in step S1.
And S4, moving the probe along a preset process track in an automatic or manual mode, and finally detecting the to-be-detected area of the blade root on the blade body.
This patent utilizes emulation software preparation detection technology, improves the reliability that detects, avoids because the rework that the quality problems of testing data caused, promotes detection speed.
The detection technology of this patent combines detecting instrument's plane wave imaging function, improves the imaging quality who detects data, avoids the hourglass of small defect to examine.
Claims (8)
1. The utility model provides a fir type blade root high efficiency detection device based on plane wave ultrasonic technology which characterized in that: the ultrasonic wave splitter comprises a splitter (7), a combined phased array ultrasonic probe (9) and a combined phased array ultrasonic wedge block; the combined phased array ultrasonic probe (9) consists of three independent sub-probes arranged in a parallel linear array; an interface at one end of the deconcentrator (7) is connected with the combined phased array ultrasonic probe (9) through a cable, and a probe at the other end is connected with an instrument interface (8) to form a phased array ultrasonic instrument; the three sub-probes are arranged on the combined phased array ultrasonic wedge block, the combined phased array ultrasonic wedge block is composed of three sub-wedge blocks, and each sub-probe corresponds to one sub-wedge block; the bottom of the combined phased array ultrasonic wedge block is provided with a flexible coupling layer (3) capable of injecting water, and the flexible coupling layer (3) is attached to the curved surface of the blade; a sub wedge block in the middle of the combined phased array ultrasonic wedge block is provided with a first inclination angle (1) in the length direction; and the sub-wedges on the two sides of the combined phased array ultrasonic wedge are provided with a second inclination angle (4) in the length direction, and the sub-wedges on the two sides are also provided with a third inclination angle (5) in the width direction.
2. The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology according to claim 1, characterized in that: one end of the deconcentrator (7) is provided with three interfaces which are respectively connected with three sub-probes of the combined phased array ultrasonic probe (9) through cables.
3. The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology according to claim 1, characterized in that: the deconcentrator (7) is provided with an operating button for selecting a probe excitation mode, and the operating button comprises a combined button (10) and an independent button (11).
4. The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology according to claim 1, characterized in that: the first inclination angle (1) and the second inclination angle (4) have the same angle and are both 36-39 degrees.
5. The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology according to claim 1, characterized in that: the angle of the third angle of inclination (5) is 5-10 °.
6. The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology according to claim 1, characterized in that: the angle of the sub-wedges on the two sides of the combined phased array ultrasonic wedge in the width direction is in a mirror image relationship.
7. The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology according to claim 1, characterized in that: and the sound insulation material (2) is arranged on the side part of the sub-wedge block in the middle of the combined phased array ultrasonic wedge block.
8. The fir tree type blade root high-efficiency detection device based on the plane wave ultrasonic technology according to claim 1, characterized in that: and sound insulation materials (2) are arranged on the lateral parts of the sub-wedges on the two sides of the combined phased array ultrasonic wedge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022204856.4U CN212301433U (en) | 2020-09-30 | 2020-09-30 | Fir-tree type blade root high-efficiency detection device based on plane wave ultrasonic technology |
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| CN202022204856.4U CN212301433U (en) | 2020-09-30 | 2020-09-30 | Fir-tree type blade root high-efficiency detection device based on plane wave ultrasonic technology |
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