阅读说明：本技术 一种可快速更换的组合式磁致伸缩导波相控阵换能器 (Combined magnetostrictive guided wave phased array transducer capable of being replaced quickly ) 是由 唐志峰 陈会明 郑文轩 张鹏飞 吕福在 于 2020-03-11 设计创作，主要内容包括：本发明公开了一种可快速更换的组合式磁致伸缩导波相控阵换能器。磁致伸缩带的内表面通过耦合剂粘贴在待检对象表面；多个声波感应单元紧密贴合在磁致伸缩带的外表面；周向预紧机构位于声波感应单元的边缘将声波感应单元和磁致伸缩带一起压紧在待检对象表面上；探头夹夹紧每相邻两个声波感应单元折起向外的端部,从而将各个声波感应单元组合为相控阵换能器。本发明的装置不仅容易保证探头的一致性,易于更换和维修,而且可以灵活应用于不同直径金属压力管道和金属板的检测,大大提高了装置的适用性和实用性。(The invention discloses a combined magnetostrictive guided wave phased array transducer capable of being replaced quickly. The inner surface of the magnetostrictive strip is stuck on the surface of an object to be detected through a coupling agent; the plurality of acoustic wave sensing units are tightly attached to the outer surface of the magnetostrictive strip; the circumferential pre-tightening mechanism is positioned at the edge of the acoustic wave sensing unit and presses the acoustic wave sensing unit and the magnetostrictive belt on the surface of the object to be detected together; the probe clamp clamps every two adjacent sound wave induction units and folds the outside tip to combine each sound wave induction unit into the phased array transducer. The device of the invention not only can easily ensure the consistency of the probe and is easy to replace and maintain, but also can be flexibly applied to the detection of metal pressure pipelines and metal plates with different diameters, thereby greatly improving the applicability and the practicability of the device.)

1. A rapidly replaceable combined magnetostrictive guided-wave phased array transducer, comprising:

the inner surface of the magnetostrictive strip is stuck on the surface of an object to be detected through a coupling agent;

the acoustic wave sensing units (5) are tightly attached to the outer surface of the magnetostrictive strip;

the circumferential pre-tightening mechanism is positioned at the edge of the acoustic wave sensing unit (5) and presses the acoustic wave sensing unit (5) and the magnetostrictive belt on the surface of the object to be detected together;

and the probe clamp (2) clamps the folded end parts of every two adjacent sound wave induction units (5), so that the sound wave induction units (5) are combined into a phased array transducer.

2. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 1, characterized in that: the acoustic wave sensing unit (5) comprises:

an induction coil;

the flexible circuit board (8), the flexible circuit board (8) is internally provided with an induction coil in a sealing way, and a bonding pad is reserved at the leading-out end of the induction coil of the flexible circuit board (8);

the adapter circuit board (9) is connected and mounted on the bonding pad of the flexible circuit board (8);

flexible coating (11), flexible coating (11) are by main leaf and integrative constitution of shirt rim, and the both sides edge epitaxy at main leaf middle part forms the shirt rim, and main leaf and shirt rim all are parallel strip, and flexible circuit board (9) fixed arrangement is on the surface at flexible coating (11) main leaf middle part, is fixed with button (7) on the both ends department surface of flexible coating (11) shirt rim.

3. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 2, characterized in that: the length of the skirt is shorter than that of the main sheet, two end parts of the main sheet, shorter than the skirt, of the flexible coating layers (11) are bent perpendicularly to the middle part to form folded parts, and the folded parts of the flexible coating layers (11) of two adjacent sound wave induction units (5) are clamped by the probe clamp (2) after being in contact with each other.

4. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 2, characterized in that: circumference pretension mechanism includes pretension fixed band (4), pretension fixed band (4) bottom surface fixed interval arrangement has a plurality of and button (7) cooperation to inlay the fixed position of dress, sound wave induction unit (5) are connected the cooperation through the button and are fixed on the surface of pretension fixed band (4), same pretension fixed band (4) are connected and are set up a plurality of sound wave induction unit (5) and tie up and examine the object of examining for still can be exerted the pretightning force by pretension fixed band (4) and bind on examining the object under the condition of turning up of the both ends of a plurality of sound wave induction unit (5).

5. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 2, characterized in that: the switching circuit board (9) is positioned in the center of the flexible circuit board (8).

6. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 1, characterized in that: the object to be detected is the surface of a pipe fitting or the surface of a plate.

7. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 1, characterized in that: the object to be detected is a pipe surface, the circumferential pre-tightening mechanism further comprises a rapid pre-tightening device (3), one end of the rapid pre-tightening device (3) is connected with one end of a pre-tightening fixing belt (4), and the other end of the pre-tightening fixing belt (4) is clamped or tightened at the other end of the rapid pre-tightening device (3) after passing through the object to be detected.

8. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 7, characterized in that: the quick pre-tightening device (3) specifically comprises:

bosses are fixed on two sides of one end of the base (14), and one end of the bottom of the base (14) is hinged with one end of the pre-tightening fixing belt (4);

the eccentric wheel handle (12), the eccentric wheel handle (12) is hinged between the bosses on both sides of the base (14);

the lower end of the clamping piece (13) is hinged with the other end of the bottom of the base (14), the upper end of the clamping piece (13) inclines towards one side of the boss and is positioned below the eccentric wheel handle (12), the bottom surface of the end part of the upper end of the clamping piece (13) is provided with a downward convex arc convex surface, and the middle part of the clamping piece (13) is provided with a through groove.

9. The rapidly replaceable combined magnetostrictive guided-wave phased array transducer according to claim 7, characterized in that: the quick pre-tightening device (3) specifically comprises:

the upper part of the base (19) is provided with a boss, the lower part of the base (19) is provided with a rectangular through groove, and the bottom of the base is respectively extended with a section of platform along the two sides of the opening direction of the through groove and is riveted with the pre-tightening fixing belt (4);

the grab handle (15), the grab handle (15) is hinged with the lug boss above the base (19);

the two side walls of the grab handle (15) are hinged with the rotating shaft connecting rod (16), and the rotating shaft connecting rod (16) is provided with a through hole parallel to the pre-tightening fixing belt (4);

the two ends of the U-shaped pull rod (17) are provided with external thread sections with the same length, and the two ends of the U-shaped pull rod (17) penetrate through holes of two rotating shaft connecting rods (16) on two sides of the grab handle (15) and then are screwed with double nuts to clamp the rotating shaft connecting rods (16);

the limiting block (18), the bottom of the limiting block (18) is provided with a mounting hole, the mounting hole is fixedly connected to the surface of the pre-tightening fixing band (4) through a bolt, a notch groove is formed in the side face, away from the base (19), of the limiting block (18), and the middle of the U-shaped pull rod (17) is hooked in the notch groove.

Technical Field

The invention relates to a magnetostrictive transducer in the technical field of ultrasonic guided wave nondestructive testing, in particular to a combined magnetostrictive guided wave phased array transducer capable of being replaced quickly.

Background

In recent years, resource development and energy demand in various regions are increased, so that a new wave of pipeline construction is promoted, and pipeline transportation is enabled to bear important tasks in the aspect of resource allocation. However, as the scale of laying pipelines becomes larger and larger, pipeline accidents caused by corrosion, aging and the like are frequent.

The ultrasonic guided wave nondestructive testing technology is widely applied to pipeline testing due to the advantages of long testing distance, high efficiency, low cost and the like. The traditional single-channel transducer can not circumferentially position the defects, only can excite specific mode guided waves, has poor defect characterization capability and can not adapt to the defect detection of pipelines with special structures in different environments. The phased array transducer developed on the basis can realize the functions of beam focusing, frequency scanning, modal scanning and the like by controlling the array element parameters of the arrayed transducer and the phased excitation. The method can improve the sensitivity of defect detection, and can select the excitation mode with better detection effect according to the structural characteristics of the pipeline, thereby increasing the adaptability of pipeline detection. Compared with a piezoelectric type guided wave transducer, the magnetostrictive guided wave transducer has the advantages of small probe structure, light weight and low cost, and can be rapidly deployed on detection and monitoring sites. At present, however, most of common multi-channel magnetostrictive phased array transducers are designed in an integrated mode, and a coil corresponding to each channel has an invalid excitation area with a section of moving direction parallel to the guided wave propagation direction. The transducer in the form not only reduces the guided wave energy coupled into the pipeline, but also interferes the guided wave excited by the pipeline to generate a specific mode, and the difficulty of signal interpretation is increased. Secondly, the flexibility of different diameter pipeline detection and the convenience of maintenance change have also been reduced to the design of integration.

Disclosure of Invention

The embodiment of the invention provides a combined magnetostrictive guided wave phased array transducer capable of being replaced quickly, and aims to solve the problems that the existing phased array transducer is inconvenient to install and use and has an invalid excitation area in the detection of pipelines with different diameters.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the inner surface of the magnetostrictive strip after being pre-magnetized is stuck on the surface of an object to be detected through a coupling agent;

the acoustic wave sensing units are tightly attached to the outer surface of the magnetostrictive strip;

the circumferential pre-tightening mechanism is positioned at the edge of the acoustic wave sensing unit and presses the acoustic wave sensing unit and the magnetostrictive belt onto the surface of the object to be detected;

the probe presss from both sides tight every two adjacent sound wave induction unit and folds outside tip to be phased array transducer with each sound wave induction unit combination.

The acoustic wave sensing unit includes:

an induction coil;

the flexible circuit board is internally provided with an induction coil in a sealing way, and a bonding pad is reserved at the leading-out end of the induction coil on the flexible circuit board;

the switching circuit board is connected and installed on the welding plate of the flexible circuit board;

the flexible coating, flexible coating are by main leaf and integrative constitution of shirt rim, and the both sides edge at main leaf middle part is extended and is formed the shirt rim, and main leaf and shirt rim all are parallel strip, and the flexible circuit board is fixed to be arranged on the surface at flexible coating main leaf middle part, is fixed with the button on the both ends department surface of flexible coating shirt rim.

The length of the skirt is shorter than that of the main sheet, two end parts of the main sheet, shorter than the skirt, of the flexible coating layers are perpendicular to the middle part and bent to form folded parts, and the folded parts of the flexible coating layers of two adjacent sound wave induction units are clamped by the probe clamp after being attached and contacted.

The circumference pretension mechanism includes the pretension fixed band, and the fixed interval arrangement in pretension fixed band bottom surface has a plurality of fixed positions that inlay the dress with the button cooperation, and the sound wave induction unit passes through the button and connects the cooperation to be fixed on the surface of pretension fixed band, and same pretension fixed band is connected and is set up a plurality of sound wave induction units and tie up and examine the object of examining for still can be applyed the pretightning force by the pretension fixed band and bind on examining the object under the condition of turning up of the both ends book-up portion of a. And uniformly distributed cross bars are arranged at the end part of the free end (the end which is not fixed with the quick pre-tightening device) away from the pre-tightening fixing belt, the overall rigidity of the cross bars is increased so as to facilitate the installation of the sound wave sensing unit, and the free end penetrates through the quick pre-tightening device.

The adapter circuit board is positioned in the center of the flexible circuit board. The adapter circuit board is provided with an electrical connection socket which is connected to an external detection instrument through a signal cable connecting wire.

The object to be detected is the surface of a pipe fitting or the surface of a plate. Such as the pipe of fig. 1 or the metal plate of fig. 2.

The object to be detected is a pipe surface, the circumferential pre-tightening mechanism further comprises a quick pre-tightening device, one end of the quick pre-tightening device is connected with one end of a pre-tightening fixing belt, and the other end of the pre-tightening fixing belt is clamped or tightened at the other end of the quick pre-tightening device after passing through the object to be detected.

The quick pre-tightening device specifically comprises:

bosses are fixed on two sides of one end of the base, and one end of the bottom of the base is hinged with one end of the pre-tightening fixing band;

the eccentric wheel handle is hinged between the bosses at the two sides of the base;

the lower end of the clamping piece is hinged with the other end of the bottom of the base, the upper end of the clamping piece inclines towards one side of the boss and is positioned below the eccentric wheel handle, the bottom surface of the end part of the upper end of the clamping piece is provided with a downward convex arc convex surface, and the middle part of the clamping piece is provided with a through groove.

The quick pre-tightening device specifically comprises:

the upper part of the base is provided with a boss, the lower part of the base is provided with a rectangular through groove, and the bottom of the base extends along the two sides of the opening direction of the through groove to form a section of platform respectively and is riveted with the pre-tightening fixing band;

the grab handle is hinged with the boss above the base;

the two side walls of the grab handle are hinged with the rotating shaft connecting rod, and the rotating shaft connecting rod is provided with a through hole parallel to the pre-tightening fixing belt;

the head parts of the two ends of the U-shaped pull rod are provided with external thread sections with the same length, and the head parts of the two ends of the U-shaped pull rod penetrate through the through holes of the two rotating shaft connecting rods on the two sides of the grab handle and then are screwed and clamped by double nuts;

the limiting block, the limiting block bottom is equipped with the mounting hole, and bolt fixed connection is passed through in pretension fixed band surface in the mounting hole, and the breach groove has been seted up to the limiting block in the side of keeping away from one side of base, and U-shaped pull rod middle part hookup is in the breach groove.

The object to be detected is the surface of the plate, the pre-tightening fixing band falls on the surface of the plate by means of gravity, and the sound wave sensing unit is pressed on the surface of the plate.

The invention solves the problems that the existing phased array transducer is inconvenient to install and use in the detection of pipelines with different diameters and has an invalid excitation area. The invention adopts the sound wave induction units as the units for wave guide excitation and reception, and the two adjacent sound wave induction units are sequentially connected through the circumferential pre-tightening mechanism and the probe clamp. A plurality of sound wave induction units are connected end to form a phased array transducer, and the phased array transducer is tightly attached to the surface of a pipeline through a quick pre-tightening device. The pipeline detection of different diameters can be realized by increasing and decreasing the number of the sound wave sensing units and adjusting the size of the folded areas at the two sides.

The detection object of the phased array transducer provided by the embodiment of the invention is not limited to a pipeline, and can realize defect detection on a metal plate.

The invention can realize the coverage of the effective excitation area of the coil on the circumference of the pipeline, can flexibly adjust according to the diameter of the pipeline to be detected, increases the installation flexibility and ensures that the phased array transducer can adapt to the detection of pipelines with different diameters.

The invention removes the ineffective excitation area of the coil on the circumference of the pipeline, improves the purity of the guided wave mode excited by the ineffective excitation area while improving the integral energy of phase control focusing, thereby reducing the difficulty in reading echo signals, improving the accuracy of defect detection and increasing the applicability and the practicability of the phase control array transducer.

In conclusion, the device of the invention not only can easily ensure the consistency of the probe and is easy to replace and maintain, but also can be flexibly applied to the detection of metal pressure pipelines and metal plates with different diameters, thereby greatly improving the applicability and the practicability of the device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a phased array transducer according to an embodiment of the present invention for testing a metal pressure pipe.

Fig. 2 is a schematic diagram of the detection of a phased array transducer on a metal plate according to an embodiment of the present invention.

Fig. 3 is a schematic plan view of an acoustic wave sensing unit according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of an initial state (a) and a folded state (b) of an acoustic wave sensing unit according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a fast pretensioning device according to an embodiment of the present invention.

Fig. 6 is another schematic structural diagram of the quick pretensioning device according to the embodiment of the invention.

In the figure: 1-a pipeline, 2-a probe clamp, 3-a quick pre-tightening device, 4-a pre-tightening fixing band, 5-a sound wave sensing unit, 6-a metal plate, 7-a button, 8-a flexible circuit board, 9-a switching circuit board, 10-an electrical connection socket, 11-a flexible coating layer, 12-an eccentric wheel handle, 13-a clamping sheet, 14-a base, 15-a grab handle, 16-a rotating shaft connecting rod, 17-a U-shaped pull rod, 18-a limiting block and 19-a base.

Detailed Description

The embodiment of the invention provides a combined magnetostrictive guided wave phased array transducer capable of being replaced quickly, and aims to solve the problems that the existing phased array transducer is inconvenient to install and use and has an invalid excitation area in the detection of pipelines with different diameters.

The technical scheme in the embodiment of the invention has the following overall structure: an acoustic wave sensing unit; a circumferential pre-tightening mechanism; and the probe clamp is used for clamping the area adjacent to the folded sound wave induction unit and combining the sound wave induction unit into a phased array transducer. The magnetostrictive strip is tightly attached to the acoustic wave sensing unit, and is adhered to the surface of an object to be detected through a coupling agent after being pre-magnetized;

the device for keeping the pre-tightening fixing belt in the circumferential pre-tightening state in the embodiment of the invention is not limited to the eccentric wheel quick pre-tightening device provided by the invention, and other mechanical devices with similar functions can be adopted.

In the embodiment of the invention, the mode of tightly attaching the folded areas of the adjacent sound wave induction units is not limited to a probe clamp, and fixing modes such as buttons, magic tapes and magnetic material adsorption can also be selected.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a combined magnetostrictive guided wave phased array transducer capable of being rapidly replaced, and as shown in fig. 1, the combined magnetostrictive guided wave phased array transducer comprises a probe clamp 2, a rapid pre-tightening device 3, a pre-tightening fixing belt 4 and acoustic wave sensing units 5, wherein a magnetostrictive belt is pre-magnetized and then adhered to the same circumferential surface of a pipeline 1 through a coupling agent, and a plurality of acoustic wave sensing units 5 are sequentially and tightly fixed on the outer surface of the magnetostrictive belt along the circumferential direction around the circumference of the magnetostrictive belt.

As shown in fig. 3, the acoustic wave sensing unit 5 includes a button 7, a flexible circuit board 8, a relay circuit board 9, an electrical connection socket 10, and a flexible coating layer 11. The buttons 7 are located at four corners of the flexible coating layer 11, the flexible circuit board 8 comprises induction coils, the switching circuit board 9 is connected with a bonding pad of the flexible circuit board 8, and the electrical connection socket 10 is connected with the switching circuit board 9, so that input of an excitation signal and output of an echo signal are completed.

And the flexible coating layer 11 integrates the induction coil, the flexible circuit board 9 and the switching circuit board 8 into a whole. The flexible coating layer 11 is formed by integrating a main sheet and a skirt edge, the two side edges at the middle part of the main sheet are extended to form the skirt edge, the main sheet and the skirt edge are both in parallel strips, the flexible circuit board 9 is fixedly arranged on the surface of the middle part of the main sheet of the flexible coating layer 11 along the strips, and buttons 7 are fixed on the outer surfaces of the two ends of the skirt edge of the flexible coating layer 11. The skirt edge of the flexible coating layer 11 is used as a region of the circumferential pre-tightening mechanism for applying pre-tightening force in the folded state of the acoustic wave induction unit.

Circumference pretension mechanism includes pretension fixed band 4 and quick preloading device 3, 4 bottom surface fixed interval arrangement of pretension fixed band have a plurality ofly with the cooperation of button 7 inlay the dress fixed position, fixed position and the cooperation installation of button 7 form the button connection, sound wave induction unit 5 passes through the button and connects the cooperation to be fixed at the internal surface of pretension fixed band 4, same pretension fixed band 4 is connected and is set up a plurality of sound wave induction units 5 and tie up outside pipeline 1, make still can apply the pretightning force by pretension fixed band 4 under the condition of turning up of the both ends book-up portion of a plurality of sound wave induction units 5 and bind on pipeline 1.

In the flexible coating layer 11, the length of the skirt is shorter than that of the main sheet, the whole skirt and the middle part of the main sheet are in arc-shaped close contact with the outside of the pipeline 1, two end parts of the main sheet shorter than the skirt are bent perpendicular to the middle part to form folded parts, the folded parts are arranged perpendicular to the circumference of the pipeline 1 in the radial direction, and the inner surfaces of the folded parts of the flexible coating layers 11 of two adjacent sound wave induction units 5 are clamped by the probe clamp 2 after being in close contact with each other.

Meanwhile, the skirt edges of the flexible coating layers 11 of the acoustic wave induction units 5 are circumferentially pre-tightened through the quick pre-tightening device 3, so that the phased array transducer is tightly attached to the magnetostrictive strip on the surface of the pipeline 1.

As shown in fig. 5, the quick-pretensioning device 3 comprises an eccentric wheel handle 12, a clamping piece 13 and a base 14.

Bosses are fixed on two sides of one end of the base 14, the bosses are arranged perpendicular to the plane of the bottom of the base 14, and one end of the bottom of the base 14 is hinged with one end of the pre-tightening fixing band 4; the eccentric wheel handle 12 is hinged between bosses at two sides of the base 14; the lower end of the clamping piece 13 is hinged with the other end of the bottom of the base 14, the upper end of the clamping piece 13 inclines towards one side of the boss and is positioned below the eccentric wheel handle 12, the bottom surface of the end part of the upper end of the clamping piece 13 is provided with a downward convex arc convex surface, the middle part of the clamping piece 13 is provided with a through groove, and the through groove is close to the lower end of the hinged part of the clamping piece 13 and the base 14. When the eccentric wheel handle 12 is pulled down, the arc bulge of the clamping sheet 13 is slightly deformed by being extruded to the pre-tightening fixing belt 4, and the circumferential pre-tightening effect is increased on the pre-tightening fixing belt 4.

As shown in fig. 5, one end of the pre-tensioned strap 4 is hinged to one end of the base 14 through a pre-formed winding hole. The other end of the pre-tightening fixing band 4 bypasses the circumference of the pipeline 1 and then returns to the base 14, after passing through the through groove at the position, close to the hinge, of the clamping piece 13, the eccentric wheel handle 12 is rotated to enable one end, far away from the hinge, of the clamping piece 13 to move downwards, so that the pre-tightening fixing band 4 is clamped between the circular arc convex surface at the upper end of the clamping piece 13 and the base 14, the circular arc convex surface of the clamping piece 13 extrudes the pre-tightening fixing band 4 to be slightly bent, and the circumferential pre. When the pre-tightening fixing band 4 winds the circumference of the pipeline 1, the pre-tightening fixing band is connected with each sound wave induction unit 5 outside the circumference of the pipeline 1 through the skirt button of the flexible coating layer 11.

The quick pre-tightening device 3 can also adopt a structure as shown in fig. 6, and comprises a grab handle 15, a rotating shaft connecting rod 16, a U-shaped pull rod 17, a limiting block 18 and a base 19.

A boss is arranged on the upper part of the base 19, a rectangular through groove is arranged on the lower part of the base 19, and a section of platform extends from the bottom of the base along the opening direction of the through groove and is riveted with the pre-tightening fixing belt 4;

the grab handle 15 is hinged with the lug boss above the base 19;

the two side walls of the grab handle 15 are hinged with a rotating shaft connecting rod 16, and the rotating shaft connecting rod 16 is provided with a through hole parallel to the pre-tightening fixing belt 4;

the two ends of the U-shaped pull rod 17 are provided with external thread sections with the same length, and the two ends of the U-shaped pull rod 17 penetrate through the through holes of the two rotating shaft connecting rods 16 at the two sides of the grab handle 15 and then are screwed and clamped with the rotating shaft connecting rods 16 by double nuts;

stopper 18, stopper 18 bottom are equipped with the mounting hole, and the mounting hole passes through bolt fixed connection in pretension fixed band 4 surface, and the breach groove has been seted up to stopper 18 in the side of keeping away from one side of base 19, and the middle part hookup of U-shaped pull rod 17 is in the breach groove. The two side walls of the limiting block 18 are both provided with grooves, and the bottom of the limiting block is provided with mounting holes which are matched with fixing positions distributed at a certain interval at one end of the pre-tightening fixing band 4.

As shown in fig. 6, one end of the pre-tightening fixing band 4 is welded on a platform extending from the bottom of the base 19, and the other end of the pre-tightening fixing band 4 passes through the rectangular through hole of the base 19 after surrounding a circle through the outer surface of the pipeline 1. And selecting a fixing position with a proper distance at the other end of the pre-tightening fixing band 4, mounting the limiting block 18 on the fixing position, and rotating the transverse straight rod section of the U-shaped pull rod 17 to the groove inlet position of the limiting block 18. The handle 15 is pulled down, and the U-shaped pull rod 17 moves along the groove slope of the limiting block 18 to finally reach the bottom of the groove, so that the looseness of the pre-tightening fixing band 4 is limited in the circumferential direction of the pipeline 1.

The specific implementation working process of the invention is as follows:

as shown in fig. 4, the initial state (a) of the acoustic wave sensing unit in the phased array transducer is that the flexible covering layer 11 is in a flat state when not contacting the external pipe, and the folded state (b) is that the flexible covering layer 11 folds up both ends when not contacting the external pipe. Since the two sides of the acoustic wave induction unit can be folded, the invalid excitation area of the induction coil is avoided.

A plurality of sound wave induction units 5 are connected into a whole through a pre-tightening fixing belt 4, and the folded areas of the adjacent sound wave induction units 5 are fixed through a probe clamp. The phased array transducer is tightly attached to the surface of the pipeline because the quick pre-tightening device 3 keeps a circumferential tightening state. The phased array transducer can be suitable for pipelines with different diameters by increasing or decreasing the number of the sound wave induction units 5 on the circumferential direction of the pipeline and properly adjusting the size of the folded areas on the two sides, and meanwhile, the flexible characteristics of the sound wave induction units 5 extend the cambered surface of the phased array transducer disclosed by the invention, so that the phased array transducer can be suitable for cambered surfaces with different curvatures.

In the embodiment of the invention, the pre-tightening fixing band is distributed with the fixing positions of the buttons, the fixing positions are uniformly distributed in the middle of the pre-tightening fixing band and are densely distributed in two end areas of the pre-tightening fixing band, so that the position of the sound wave sensing unit at the joint of the pre-tightening fixing band is flexibly adjusted when pipelines with different diameters are dealt with, and the coverage of the effective excitation area of the coil on the circumference of the pipeline is convenient to realize.

In the initial state of the embodiment of the invention, the acoustic wave sensing unit is in a straight state. When the phased array transducer is required to be formed, the plurality of sound wave induction units are sequentially fixed on the pre-fastening fixing belt through buttons on the flexible coating layers, and meanwhile, the folding areas of the adjacent sound wave induction units are clamped tightly through the probe clamps. In order to enable the sound wave sensing unit to be tightly attached to the surface of the pipeline, the quick pre-tightening device is used for keeping the pre-tightening fixing band after the pre-tightening fixing band is circumferentially tightened. Because the number of the sound wave induction units and the size of the folded areas on the two sides can be flexibly adjusted according to the diameter of the pipeline to be detected, and the coil working area can be folded under special conditions, the installation flexibility is increased, and the phased array transducer formed by the method can adapt to the detection of pipelines with different diameters.

In addition, the invention removes the ineffective excitation area of the coil on the circumference of the pipeline, improves the purity of the excited guided wave mode while improving the integral energy of phase-controlled focusing, and thus reduces the difficulty in interpretation of echo signals. In summary, the invention not only can be suitable for pipelines with different diameters, and the circumferential direction is tightly attached to the surface for flaw detection, but also optimizes the circumferential direction excitation position of the induction coil through a fragmentation combination mode, thereby improving the accuracy of flaw detection and increasing the applicability and the practicability of the phased array transducer.