CN117823760A - Phased array ultrasonic flaw detector for heat exchange tube and detection method - Google Patents

Abstract

The invention discloses a phased array ultrasonic flaw detector for a heat exchange tube and a detection method, comprising a flaw detection ring fixing unit, a flaw detection ring translation unit, a first output unit and a second output unit; the flaw detection ring fixing unit comprises a first pipeline sleeve ring, a transmission mechanism is arranged in the first pipeline sleeve ring, and the transmission mechanism is in transmission connection with a power output end of the first output unit; the flaw detection unit is of an annular structure and is coaxially arranged with the first pipeline lantern ring, the flaw detection unit comprises a plurality of phased array probes which are circumferentially arranged, the flaw detection unit is in transmission connection with the transmission mechanism, and the first output unit drives the flaw detection unit to do circular motion around the heat exchange pipe; the flaw detection ring translation unit is used for being fixed on the outer wall of the heat exchange tube; the second output unit is arranged on the flaw detection ring translation unit and is used for driving the flaw detection ring fixing unit to move along the axial direction of the heat exchange tube. The invention can realize one-time omnibearing detection of a section of heat exchange tube without repeated reciprocating motion and manual movement of a flaw detector.

Description

Phased array ultrasonic flaw detector for heat exchange tube and detection method

Technical Field

The invention relates to the technical field of heat exchange tube ultrasonic detection, in particular to a phased array ultrasonic flaw detector for a heat exchange tube and a detection method.

Background

Heat exchange equipment plays an important role in petrochemical industry and the like, but leakage faults are easy to occur during operation due to damage to the surfaces of heat exchange tubes. Therefore, the damage degree detection of the surface of the heat exchange tube is required to be carried out periodically by using a special flaw detector.

Among the existing detection means, a phased array ultrasonic detection method is widely adopted because of the advantages of wide detection range, short feedback time and the like.

However, the existing phased array ultrasonic flaw detector can only perform manual translation detection on the part on the same straight line, and if the same section of heat transfer tube is required to be detected in all directions, repeated reciprocating motion is required, so that the labor intensity is high, and the angle difference is caused by manual operation, so that the detection precision is affected.

Disclosure of Invention

The invention aims to provide a phased array ultrasonic flaw detector for a heat exchange tube, which can realize one-time omnibearing detection of a section of heat exchange tube without repeated reciprocating motion and manual movement of the flaw detector.

In addition, the invention also provides a detection method based on the phased array ultrasonic flaw detector for the heat exchange tube.

The invention is realized by the following technical scheme:

the phased array ultrasonic flaw detector for the heat exchange tube comprises a flaw detection ring fixing unit, a flaw detection ring translation unit, a first output unit and a second output unit;

the flaw detection ring fixing unit comprises a first pipeline sleeve ring, a transmission mechanism is arranged in the first pipeline sleeve ring, and the transmission mechanism is in transmission connection with a power output end of the first output unit;

the flaw detection unit is of an annular structure and is coaxially arranged with the first pipeline lantern ring, the flaw detection unit comprises a plurality of phased array probes which are circumferentially arranged, the flaw detection unit is in transmission connection with the transmission mechanism, and the first output unit drives the flaw detection unit to do circular motion around the heat exchange pipe;

the flaw detection ring translation unit is used for being fixed on the outer wall of the heat exchange tube;

the second output unit is arranged on the flaw detection ring translation unit and is used for driving the flaw detection ring fixing unit to move along the axial direction of the heat exchange tube.

The phased array probe is an existing flaw detection probe.

The flaw detection unit can do circular motion around the heat exchange tube under the drive of the first output unit, so that all groups of phased array probes distributed in a circular array (circumferentially arranged) can conduct full-range stepless detection on the surface of the heat exchange tube at the same time, the condition of missed detection is avoided, when damage occurs to a certain position on the surface of the heat exchange tube, a plurality of groups of phased array probes can be used for detecting the surface of the heat exchange tube, and inaccurate flaw detection caused by failure of one group of phased array probes is avoided; thereby improving the detection accuracy. The second output unit is used for driving the flaw detection ring fixing unit to move along the axial direction of the heat exchange tube, and simultaneously, the first output unit and the second output unit are started, so that the flaw detection unit moves close to the flaw detection ring translation unit while performing circular motion, namely, the invention can realize one-time omnibearing detection on a section of heat exchange tube without multiple reciprocating motions and manual movement of a flaw detector.

Further, the transmission mechanism comprises a hollow bearing seat and a driven gear ring, the hollow bearing seat and the driven gear ring are coaxially arranged on the inner side of the first pipeline lantern ring, one axial end of the driven gear ring is connected with a port of the hollow bearing seat, and the other axial end of the driven gear ring is connected with the flaw detection unit; the first output unit comprises a first motor, a transmission gear is arranged on an output shaft of the first motor, and the transmission gear is meshed with the driven toothed ring.

The hollow bearing seat is in the prior art, the transmission gear and the driven toothed ring form gear transmission, the driving force of the first motor is transmitted to the flaw detection unit through the gear transmission, the flaw detection unit performs circular motion on the outer side of the heat exchange tube, and the circular motion refers to the rotation of the flaw detection unit around the central shaft of the flaw detection unit.

Further, the first pipeline lantern ring comprises a first limiting plate and a second limiting plate, the first limiting plate and the second limiting plate are arc-shaped plates, one ends of the first limiting plate and the second limiting plate are connected in a rotating mode, the other ends of the first limiting plate and the second limiting plate are connected in a detachable mode, and through holes are formed in the first limiting plate or the second limiting plate and used for achieving transmission connection of a transmission mechanism and a first output unit.

The first pipeline lantern ring is designed into a first limiting plate and a second limiting plate which are detachable, so that the whole flaw detection ring fixing unit is conveniently installed on the heat transfer pipe.

Further, the flaw detection unit comprises a plurality of flaw detection head mounting blocks, two adjacent flaw detection head mounting blocks are connected through a mounting block connecting plate, and the plurality of flaw detection head mounting blocks and the plurality of mounting block connecting plates form a circular ring structure; the phased array probe is arranged on the flaw detection head installation block and extends out of the flaw detection head installation block along the radial direction inwards, each flaw detection head installation block is at least provided with one phased array probe correspondingly, one axial end part of the flaw detection head installation block is provided with a toothed ring clamping block, and the flaw detection unit is in transmission connection with the transmission mechanism through the toothed ring clamping block.

Further, the inner wall of the flaw detection head mounting block is recessed outwards along the radial direction to form a telescopic groove, and the phased array probe is fixed in the telescopic groove through an elastic piece.

Further, a path detecting mechanism is arranged on the inner side of the flaw detection head mounting block, and an included angle is formed between the path detecting mechanism and a central shaft of the flaw detection unit; the path exploring mechanism comprises a roller mounting shell and a path exploring roller, the path exploring roller is mounted in the roller mounting shell through an elastic mechanism, and the path exploring roller is in contact with the outer wall of the heat exchange tube.

Further, the one end that the first installation piece of detecting a flaw was kept away from to the gyro wheel installation shell is for being provided with the installation shell opening, elastic mechanism includes the elastic rod, the bottom and the gyro wheel installation shell bottom of elastic rod are connected, be provided with first spring in the elastic rod, the tip of first spring is connected with adduction pole through the spring cardboard, the spring cardboard is arranged in the elastic rod all the time, the stretch out elastic rod and the tip and the way roller connection of adduction pole.

Further, the elastic mechanism comprises a plurality of elastic rods which are arranged in rows.

Further, a sliding groove is formed in one side wall, close to the phased array probe, of the roller mounting shell, a sliding block is connected in a sliding mode in the sliding groove, one end of the sliding block is mounted on the adduction rod, and the other end of the sliding block is connected with the phased array probe through a flaw detection head connecting rod.

Further, the two sides of the phased array probe are provided with path finding mechanisms.

Further, the flaw detection head mounting block is detachably connected with the mounting block connecting plate.

Further, the flaw detection ring translation unit comprises a second pipeline lantern ring, a telescopic assembly is arranged on the inner wall of the second pipeline lantern ring along the circumferential direction, and the flaw detection ring translation unit is fixed by pressing and clamping the heat exchange tube through the telescopic assembly.

Further, the telescopic assembly comprises an electric push rod or a hydraulic push rod.

The electric push rod and the hydraulic push rod are both in the prior art and can stretch out and draw back.

Further, the one end that the second pipeline lantern ring was kept away from to flexible subassembly is provided with the pipeline cardboard, the pipeline cardboard is with heat exchange tube outer wall assorted arc, through setting up the pipeline cardboard, can improve the centre gripping stability of flexible subassembly to the heat exchange tube.

Further, the inner wall of the second pipeline lantern ring is recessed outwards along the radial direction to form a through hole inner groove, one end of the telescopic component is installed in the through hole inner groove, and the other end of the telescopic component extends out of the through hole inner groove.

Further, the second pipeline lantern ring comprises two third limiting plates, and one end of each third limiting plate is connected in a rotating mode, and the other end of each third limiting plate is connected in a detachable mode.

Further, the second output unit comprises a second motor, an output shaft of the second motor is connected with a rotating rod, a tension steel coil is coiled on the rotating rod, the end part of the tension steel coil is detachably connected with the flaw detection ring fixing unit or the first output unit, and the flaw detection ring fixing unit is driven to move close to the flaw detection ring translation unit through coiling the tension steel coil.

Further, a scale is arranged on the tension steel coil.

Further, the end part of the tension steel coil is provided with a mounting box clamping block, and the mounting box clamping block is clamped with the flaw detection ring fixing unit or the first output unit.

Further, the flaw detection unit is disposed inside the first pipe collar.

The detection method based on the phased array ultrasonic flaw detector of the heat exchange tube comprises the following steps:

s1, coaxially installing a flaw detection ring fixing unit and a flaw detection ring translation unit on a heat exchange tube; the phased array probe is circumferentially arranged outside the heat exchange tube;

s2, simultaneously starting the first output unit and the second output unit, so that the flaw detection unit moves the flaw detection ring fixing unit close to the flaw detection ring translation unit while performing circular motion.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. according to the invention, the flaw detection unit can do circular motion around the heat exchange tube under the drive of the first output unit, the second output unit is used for driving the flaw detection ring fixing unit to move along the axial direction of the heat exchange tube, and the first output unit and the second output unit are started at the same time, so that the flaw detection unit moves close to the flaw detection ring translation unit while doing circular motion, manual translation is not needed, the labor intensity is reduced, and the angle deviation caused by manual operation is reduced.

2. Because the roller mounting shell and the central shaft of the flaw detection unit have an included angle, under the condition of horizontal displacement (axial displacement) of the flaw detection ring, the invention can ensure that all groups of path detection rollers are attached to the surface of the heat transfer tube to perform circular motion, thereby improving the fluency of detection work.

3. According to the invention, each group of path-exploring rollers can independently stretch, so that when the diameter of the heat transfer pipe changes or the surface of the heat transfer pipe is uneven, each group of path-exploring rollers can be tightly attached to the surface of the heat transfer pipe, and when a group of path-exploring rollers positioned at the center passes through the uneven part, the height change of the path-exploring rollers can be utilized to drive the phased array probe to synchronously change in height. The distance from each group of phased array probes to the heat transfer tube meter is always the same, so that the device can be suitable for heat transfer tubes with various diameters, the compatibility of the device is improved, and the detection precision is ensured.

4. According to the invention, the dial gauge is arranged on the surface of the tension steel coil, so that the detected distance can be accurately known in the damage degree detection process of the heat transfer tube, and the detection data can be conveniently analyzed and recorded by a detector, thereby improving the convenience of detection work.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:

FIG. 1 is a schematic diagram of a phased array ultrasonic flaw detector for a heat exchange tube;

FIG. 2 is an axial cross-sectional schematic view of the inspection ring fixing unit of the present invention;

FIG. 3 is a schematic illustration of the connection of a hollow bearing housing and a driven ring gear;

FIG. 4 is a schematic diagram of a connection of a flaw detection ring fixing unit and a first output unit;

FIG. 5 is a schematic diagram of the structure of the flaw detection unit;

FIG. 6 is an enlarged schematic view of the interior of circle A of FIG. 5;

FIG. 7 is a schematic diagram of the path finding mechanism;

FIG. 8 is a schematic cross-sectional view of the path finding mechanism;

FIG. 9 is a schematic diagram of a flaw detection ring translation unit;

FIG. 10 is a schematic cross-sectional view of a flaw detection ring translation unit.

In the drawings, the reference numerals and corresponding part names:

100-flaw detection ring fixing units; 101-a first conduit collar; 110-a first limiting plate; 120-a second limiting plate; 130-a first central through hole; 140-hollow bearing seats; 150-driven toothed ring; 200-a first output unit; 210-a first mounting box; 220-a first motor; 230-a transmission gear; 300-flaw detection unit; 310-flaw detection head mounting block; 311-clip; 312-telescoping slots; 320-mounting block connection plates; 330-a toothed ring clamping block; 340-a path-finding mechanism; 341-a roller mounting shell; 342-mounting shell opening; 343-spring bar; 344-a first spring; 345-spring catch plate; 346-adduction lever; 347-path-finding rollers; 348—a chute; 349-slider; 350-phased array probe; 351-a second spring; 352-flaw detection head connecting rod; 400-flaw detection ring translation unit; 410-a second conduit collar; 411-a third limiting plate; 412-a second central through hole; 420-through hole inner slots; 430-electric putter; 440-pipe clamp plate; 500-a second output unit; 510-a second mounting box; 511-a steel coil outlet; 520-a second motor; 521-rotating rod; 530-pulling a steel coil; 531-a scale; 540-mounting box fixture blocks.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.

Example 1:

as shown in fig. 1 to 10, a phased array ultrasonic flaw detector for heat exchange tubes comprises a flaw detection ring fixing unit 100, a flaw detection unit 300, a flaw detection ring translation unit 400, a first output unit 200 and a second output unit 500;

the first output unit 200 is installed on the flaw detection ring fixing unit 100, and is used for driving the flaw detection unit 300 to do circular motion around the heat exchange tube; the second output unit 500 is installed on the flaw detection ring translation unit 400, specifically, the output end of the second output unit 500 is movably clamped on the housing of the first output unit 200, and the second output unit 500 is used for driving the flaw detection ring fixing unit 100 to move along the axial direction of the heat exchange tube.

The output end of the first output unit 200 is in transmission connection with the input end of the flaw detection ring fixing unit 100; the flaw detection unit 300 is positioned in the cavity of the flaw detection ring fixing unit 100 and is rotatably connected to the output end of the flaw detection ring fixing unit 100; the flaw detection unit 300 is used for detecting flaws on the surface of the heat exchange tube.

The flaw detection ring translation unit 400 is positioned at one side of the flaw detection ring fixing unit 100, and the central axis of the flaw detection ring translation unit 400 is coincident with the central axis of the flaw detection ring fixing unit 100; the inspection ring translation unit 400 is used to fix the angular orientation of the inspection ring fixing unit 100.

The flaw detection unit 300 of the present embodiment can perform a circular motion around the heat exchange tube under the driving of the first output unit 200, and the second output unit 500 is used for driving the flaw detection ring fixing unit 100 to move along the axial direction of the heat exchange tube, and simultaneously starts the first output unit 200 and the second output unit 300, so that the flaw detection unit 300 performs a circular motion and simultaneously moves the flaw detection ring fixing unit 100 close to the flaw detection ring translation unit.

Specifically:

the inspection ring fixing unit 100 includes a first pipe collar 101. As shown in fig. 2, 3 and 4, the first pipe collar 101 has an annular structure and a central through hole 130; the first pipeline lantern ring 101 comprises a first limiting plate 110 and a second limiting plate 120 which are identical in structure, one end of the first limiting plate 110 is hinged with one end of the second limiting plate 120, and the other end of the first limiting plate is clamped with the other end of the second limiting plate 120; a hollow bearing seat 140 is fixedly arranged in the first pipeline lantern ring 101, and a driven gear ring 150 is rotatably connected to a port at one end of the hollow bearing seat 140; the hollow shaft bearing seat 140 and the driven gear ring 150 are both detachable structures; the hollow shaft bearing seat 140, the driven gear ring 150 and the central axis of the first pipeline collar 101 are all coincident; the brand model of the hollow socket 140 is eastern force-519892.

As shown in fig. 2, the first output unit 200 includes a first mounting box 210, the first mounting box 210 is fixedly mounted on the first limiting plate 110, a first motor 220 is fixedly mounted on the first mounting box 210, a transmission gear 230 is connected to an output end of the first motor 220 in a transmission manner, and one side of the transmission gear 230 extends into a cavity of the first pipe collar 101 and is in meshed connection with the driven toothed ring 150.

When the damage degree of the surface of the heat transfer pipe is required to be detected, firstly fixing the flaw detection ring translation unit 400 on the heat transfer pipe, then sleeving the flaw detection units 300 of the driven gear ring 150 on the heat transfer pipe, and connecting the second output unit 500 with the first output unit 200; the probe portion of the flaw detection unit 300 is connected with an external detection display device by a signal. Then, the probe part of the flaw detection unit 300 is started, the first motor 220 is started simultaneously, the transmission gear 230 is driven to rotate by the first motor 220, the driven gear ring 150 is driven to rotate by the transmission gear 230, the flaw detection unit 300 is driven to rotate by the driven gear ring 150, when the surface of the heat transfer pipe is damaged and detected by the probe part of the flaw detection unit 300, the whole flaw detection unit 300 performs circular motion, the flaw detection unit 300 can perform dead angle-free omnibearing damage detection on the surface of the heat transfer pipe at the same time, and the flaw detection unit 300 can horizontally move on the surface of the heat transfer pipe through the flaw detection ring translation unit 400 without manual operation of personnel.

The flaw detection unit 300 comprises a flaw detection ring, as shown in fig. 5 and 6, the flaw detection ring is in a circular ring structure, the flaw detection ring comprises a plurality of groups of flaw detection head mounting blocks 310 distributed in a ring array, two ends of each flaw detection head mounting block 310 are respectively provided with a group of buckles 311, and a group of mounting block connecting plates 320 are clamped between two adjacent groups of flaw detection head mounting blocks 310 through the buckles 311. The installation piece connecting plate 320 is an arc plate, a telescopic groove 312 is formed in one side wall, close to the central axis of the flaw detection ring, of the flaw detection head installation piece 310, a second spring 351 is arranged in the telescopic groove 312, the other end of the second spring 351 extends to the outside of the telescopic groove 312, and a phased array probe 350 is fixedly installed. The two sides of the phased array probe 350 are respectively provided with a group of path detecting mechanisms 340, and an included angle is formed between the shell of the path detecting mechanism 340 and the central line of the flaw detection head mounting block 310 in the length direction, namely, the path detecting mechanism 340 has an included angle with the central axis of the flaw detection unit 300. A group of flaw detection head connecting rods 352 are arranged on the shells of the two groups of path detection mechanisms 340, and the other ends of the flaw detection head connecting rods 352 are arranged on the phased array probe 350; a group of toothed ring clamping blocks 330 are arranged on each group of flaw detection head mounting blocks 310, and flaw detection rings are clamped at the end ports of the driven toothed ring 150 far away from the hollow bearing seat 140 through the toothed ring clamping blocks 330; and the central axis of the flaw detection ring coincides with the central axis of the driven gear ring 150.

The path-finding mechanism 340 includes a roller mounting case 341. As shown in fig. 7 and 8, the roller mounting case 341 is mounted on a side wall of the inspection head mounting block 310 near the central axis of the inspection ring, and an angle exists between the extending direction of the roller mounting case 341 and the central line of the inspection head mounting block 310 in the length direction. A side wall of the roller mounting shell 341 far away from the flaw detection head mounting block 310 is provided with a mounting shell opening 342, a plurality of groups of elastic rods 343 are arranged on the inner wall of one side of the roller mounting shell 341 far away from the mounting shell opening 342 at equal intervals, and an extension opening is arranged on one side wall of the elastic rods 343 close to the mounting shell opening 342. And be equipped with first spring 344 in the elastic rod 343, the one end fixed mounting that first spring 344 is close to the extension mouth has spring cardboard 345, and the outside diameter of spring cardboard 345 is greater than the inside diameter of extension mouth, and fixed mounting has adduction pole 346 on the one side wall that spring cardboard 345 kept away from first spring 344, and adduction pole 346 other end extends to the gyro wheel mounting shell 341 outside through the extension mouth, and installs the feeler lever 347. A sliding groove 348 is formed in a side wall, close to the phased array probe 350, of the roller mounting shell 341, a sliding block 349 is connected to the sliding groove 348 in a sliding mode, one end of the sliding block 349 is mounted on the middle group of adduction rods 346, and the other end of the sliding block 349 is mounted on the flaw detection head connecting rod 352.

When the flaw detection unit 300 is installed, the flaw detection head installation blocks 310 of each group are firstly installed in sequence through a plurality of installation block connection plates 320, and finally form an annular flaw detection ring which is sleeved on the periphery of the heat transfer tube. Meanwhile, each group of path-finding rollers 347 are attached to the surface of the heat transfer tube from different directions, so that the central axis of the flaw detection ring coincides with the central axis of the heat transfer tube, and the distances from each group of phased array probes 350 distributed in the annular array to the surface of the heat transfer tube are the same. The first output unit 200 and the second output unit 500 are then activated so that each set of phased array probes 350 moves horizontally while moving circularly toward the inspection ring translation unit 400 side. So that the flaw detection ring can detect all positions on the surface of the heat transfer pipe at the same time.

In the process of detection, the phased array probe 350 firstly uses the ultrasonic output mechanism to send ultrasonic signals to the surface of the heat transfer tube, and then when the ultrasonic signals contact the surface of the heat transfer tube, the ultrasonic signals rebound and are received by the signal receiving mechanism in the phased array probe 350. The damage degree of the surface of the heat transfer tube is judged by observing the change of the impedance of the ultrasonic signal. When the heat transfer tube surface is normal, the signal received by the signal receiving mechanism of the phased array probe 350 will also be within the normal range. When the surface of the heat transfer pipe is scratched such as dents or cracks, the impedance of the ultrasonic signal received by the phased array probe 350 is changed, and the phased array probe 350 transmits a signal to an external detection display device, thereby achieving the purpose of ultrasonic flaw detection. And the signals sent by the phased array technology are fan-shaped, so that the phased array probe 350 can receive feedback of ultrasonic signals even in motion, and the conception scope of the device is wider.

The inspection ring translation unit 400 includes a second conduit collar 410. As shown in fig. 9 and 10, the second pipe collar 410 has a circular ring structure, and the second pipe collar 410 includes two sets of third limiting plates 411 having a fan-shaped annular plate structure (arc plate) in cross section, and one ends of the two sets of third limiting plates 411 are hinged to each other, and the other ends of the two sets of third limiting plates are clamped to each other. The second pipe collar 410 is located at one side of the first pipe collar 101, and central axes of the second pipe collar and the first pipe collar are coincident. The second central through hole 412 is formed in the central axis of the second pipe collar 410, a plurality of groups of through hole inner grooves 420 are distributed on the inner wall of the second central through hole 412 in an annular array, an electric push rod 430 is fixedly mounted in the through hole inner grooves 420, the output end of the electric push rod 430 extends into the second central through hole 412, and a pipe clamping plate 440 is fixedly mounted.

The second output unit 500 includes a second mounting box 510, the second mounting box 510 is fixedly mounted on the second pipe collar 410, a steel coil outlet 511 is formed on a side wall of the second mounting box 510, which is close to the first mounting box 210, a second motor 520 is fixedly mounted on the second mounting box 510, a rotating rod 521 is connected to an output end of the second motor 520 in a transmission manner, a tension steel coil 530 is wound on the rotating rod 521, one end of the tension steel coil 530 extends to the outside of the second mounting box 510 through the steel coil outlet 511, a mounting box clamping block 540 is fixedly mounted, and the other end of the mounting box clamping block 540 is clamped on the first mounting box 210. The steel tension coil 530 is provided with a graduation gauge 531.

First, the second pipe collar 410 is sleeved on the periphery of the heat transfer pipe, the central axis of the second pipe collar coincides with the heat transfer pipe, and then each group of electric push rods 430 are started, so that each group of pipe clamping plates 440 can be clamped on the heat transfer pipe from different directions, and the fixing effect is achieved. Then, the length of the heat transfer tube to be detected is determined according to the scale 531, and the mounting box fixture block 540 is clamped on the first mounting box 210. Then, the second motor 520 is started, the second motor 520 drives the rotating rod 521 to rotate, and the tension steel coil 530 can perform winding work, so that the flaw detection unit 300 can horizontally move to one side of the second pipeline collar 410 while performing circular motion. The overall stability of the first pipe collar 101 is ensured by the tension steel coil 530 without manual control, so that the angular offset of the first pipe collar 101 is prevented, and the detection accuracy of the phased array probe 350 is reduced.

In this embodiment, the first output unit 200 drives the flaw detection unit 300 to perform circular motion, so that the phased array probes 350 distributed in the annular array can perform full-range stepless detection on the surface of the heat transfer tube at the same time, and the condition of missing detection is avoided. And when damage occurs to a certain part of the surface of the heat transfer pipe, a plurality of groups of phased array probes 350 can be used for detecting the damage, so that inaccurate flaw detection caused by failure of one group of phased array probes 350 is avoided. Thereby improving the detection accuracy. And the second output unit 500 is utilized to work, so that the flaw detection ring can horizontally move when performing circular motion, manual translation is not needed, the labor intensity is reduced, and the angle deviation caused by manual operation is also reduced. Because there is the contained angle between the axis of gyro wheel mounting shell 341 and the length direction of detecting a flaw first installation piece 310, consequently also can make the laminating of each group of exploratory gyro wheel 347 carry out circular motion on the heat transfer tube surface under the condition of detecting a flaw ring horizontal displacement to the smoothness that has improved detection work. Each group of the path-exploring rollers 347 can independently stretch, so that when the diameter of the heat transfer pipe changes or the surface of the heat transfer pipe is uneven, each group of the path-exploring rollers 347 can be tightly attached to the surface of the heat transfer pipe, and when a group of the path-exploring rollers 347 positioned at the center passes through the uneven part, the height change of the path-exploring rollers 347 is utilized to drive the phased array probe 350 to synchronously change in height. The distances from each group of phased array probes 350 to the heat transfer tube meter are always the same, so that the device can be suitable for heat transfer tubes with various diameters, the compatibility of the device is improved, and the detection precision is ensured. The flaw detection ring fixing unit 100, the flaw detection unit 300 and the flaw detection ring translation unit 400 all adopt detachable mechanisms, and all the components are fixed in a clamping manner, so that not only is the disassembly and assembly work simple and quick, but also the flaw detector is convenient to store and preserve when in idle. Through set up the scale 531 at pulling force coil of strip 530 surface for in the damage degree testing process of heat transfer pipe, can be accurate learn the distance that detects, be convenient for the inspector carry out analysis record to the detection data, thereby improved the convenience of detection work.

The detection method of the embodiment comprises the following steps:

s1, coaxially installing a flaw detection ring fixing unit 100 and a flaw detection ring translation unit 400 on a heat exchange tube; circumferentially disposing phased array probe 350 outside the heat exchange tube;

s2, simultaneously starting the first output unit 200 and the second output unit 500, so that the flaw detection unit 300 moves the flaw detection ring fixing unit 100 close to the flaw detection ring translation unit 400 while performing circular motion.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to the present specification are for understanding and reading only by those skilled in the art, and are not intended to limit the scope of the invention, so that any structural modifications, proportional changes, or size adjustments should fall within the scope of the invention without affecting the efficacy and achievement of the present invention. Also, the terms such as "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the invention for which the invention may be practiced or for which the relative relationships may be altered or modified without materially altering the technical context.

Claims (21)

1. The phased array ultrasonic flaw detector for the heat exchange tube is characterized by comprising a flaw detection ring fixing unit (100), a flaw detection unit (300), a flaw detection ring translation unit (400), a first output unit (200) and a second output unit (500);

the flaw detection ring fixing unit (100) comprises a first pipeline lantern ring (101), a transmission mechanism is arranged in the first pipeline lantern ring (101), and the transmission mechanism is in transmission connection with a power output end of the first output unit (200);

the flaw detection unit (300) is of an annular structure and is coaxially arranged with the first pipeline lantern ring (101), the flaw detection unit (300) comprises a plurality of phased array probes (350) which are circumferentially arranged, the flaw detection unit (300) is in transmission connection with the transmission mechanism, and the first output unit (200) drives the flaw detection unit (300) to do circular motion around the heat exchange pipe;

the flaw detection ring translation unit (400) is used for being fixed on the outer wall of the heat exchange tube;

the second output unit (500) is mounted on the flaw detection ring translation unit (400), and the second output unit (500) is used for driving the flaw detection ring fixing unit (100) to move along the axial direction of the heat exchange tube.

2. The phased array ultrasonic flaw detector for heat exchange tubes according to claim 1, wherein the transmission mechanism comprises a hollow bearing seat (140) and a driven toothed ring (150), the hollow bearing seat (140) and the driven toothed ring (150) are coaxially arranged on the inner side of the first pipeline collar (101), one axial end of the driven toothed ring (150) is connected with a port of the hollow bearing seat (140), and the other axial end is connected with a flaw detection unit (300); the first output unit (200) comprises a first motor (220), a transmission gear (230) is arranged on an output shaft of the first motor (220), and the transmission gear (230) is meshed with the driven toothed ring (150).

3. The phased array ultrasonic flaw detector for the heat exchange tube according to claim 1, wherein the first pipeline collar (101) comprises a first limiting plate (110) and a second limiting plate (120), the first limiting plate (110) and the second limiting plate (120) are arc-shaped plates, one ends of the first limiting plate (110) and the second limiting plate (120) are rotationally connected, the other ends of the first limiting plate (110) and the second limiting plate (120) are detachably connected, and through holes are formed in the first limiting plate (110) or the second limiting plate (120) and are used for realizing transmission connection of a transmission mechanism and the first output unit (200).

4. The phased array ultrasonic flaw detector for heat exchange tubes according to claim 1, wherein the flaw detection unit (300) comprises a plurality of flaw detection head mounting blocks (310), two adjacent flaw detection head mounting blocks (310) are connected through a mounting block connecting plate (320), and the plurality of flaw detection head mounting blocks (310) and the plurality of mounting block connecting plates (320) form a circular ring structure; the phased array probe (350) is arranged on the flaw detection head installation blocks (310) and extends out of the flaw detection head installation blocks (310) along the radial inward direction, each flaw detection head installation block (310) is at least provided with one phased array probe (350) correspondingly, one axial end part of each flaw detection head installation block (310) is provided with a toothed ring clamping block (330), and the flaw detection unit (300) is in transmission connection with the transmission mechanism through the toothed ring clamping blocks (330).

5. The heat exchange tube phased array ultrasonic flaw detector according to claim 4, wherein the inner wall of the flaw detection head mounting block (310) is recessed radially outwards to form a telescopic groove (312), and the phased array probe (350) is fixed in the telescopic groove (312) through an elastic piece.

6. The phased array ultrasonic flaw detector for heat exchange tubes according to claim 4, wherein a path detecting mechanism (340) is arranged on the inner side of the flaw detection head mounting block (310), and the path detecting mechanism (340) has an included angle with the central axis of the flaw detection unit (300); the path-exploring mechanism (340) comprises a roller mounting shell (341) and path-exploring rollers (347), the path-exploring rollers (347) are mounted in the roller mounting shell (341) through elastic mechanisms, and the path-exploring rollers (347) are in contact with the outer wall of the heat exchange tube.

7. The heat exchange tube phased array ultrasonic flaw detector according to claim 6, wherein one end of the roller mounting shell (341) far away from the flaw detection head mounting block (310) is provided with a mounting shell opening (342), the elastic mechanism comprises an elastic rod (343), the bottom of the elastic rod (343) is connected with the bottom of the roller mounting shell (341), a first spring (344) is arranged in the elastic rod (343), the end part of the first spring (344) is connected with an adduction rod (346) through a spring clamping plate (345), the spring clamping plate (345) is always arranged in the elastic rod (343), and the end part of the adduction rod (346) extending out of the elastic rod (343) is connected with a path-exploring roller (347).

8. The phased array ultrasonic flaw detector for heat exchange tubes as claimed in claim 7, wherein the elastic means comprises a plurality of elastic bars (343) arranged in rows.

9. The heat exchange tube phased array ultrasonic flaw detector according to claim 7, wherein a chute (348) is formed in a side wall, close to the phased array probe (350), of the roller mounting shell (341), a sliding block (349) is slidably connected to the chute (348), one end of the sliding block (349) is mounted on the adduction rod (346), and the other end of the sliding block (349) is connected to the phased array probe (350) through a flaw detection head connecting rod (352).

10. The heat exchange tube phased array ultrasonic flaw detector according to claim 6, wherein the phased array probe (350) is provided with a path finding mechanism (340) on both sides.

11. The phased array ultrasonic inspection apparatus for heat exchange tubes of claim 4, wherein the inspection head mounting block (310) is detachably connected to the mounting block connection plate (320).

12. The phased array ultrasonic flaw detector for the heat exchange tube according to claim 1, wherein the flaw detection ring translation unit (400) comprises a second pipeline collar (410), a telescopic assembly is arranged on the inner wall of the second pipeline collar (410) along the circumferential direction, and the flaw detection ring translation unit (400) is fixed by pressing and clamping the heat exchange tube through the telescopic assembly.

13. The heat exchange tube phased array ultrasonic inspection instrument of claim 12, wherein the telescoping assembly comprises an electric push rod (430) or a hydraulic push rod.

14. The phased array ultrasonic flaw detector for heat exchange tubes according to claim 12, wherein a tube clamping plate (440) is arranged at one end of the telescopic assembly far away from the second tube collar (410), and the tube clamping plate (440) is an arc-shaped plate matched with the outer wall of the heat exchange tube.

15. The phased array ultrasonic inspection apparatus of claim 12, wherein the inner wall of the second pipe collar (410) is recessed radially outwardly to form a through-hole inner groove (420), and the telescoping assembly is mounted at one end within the through-hole inner groove (420) and at the other end extends out of the through-hole inner groove (420).

16. The phased array ultrasonic flaw detector for heat exchange tubes according to claim 12, wherein the second pipe collar (410) is formed by two third limiting plates (411), and one ends of the two third limiting plates (411) are rotatably connected, and the other ends of the two third limiting plates are detachably connected.

17. The phased array ultrasonic flaw detector for the heat exchange tube according to claim 1, wherein the second output unit (500) comprises a second motor (520), an output shaft of the second motor (520) is connected with a rotating rod (521), the rotating rod (521) is coiled with a tension steel coil (530), the end part of the tension steel coil (530) is detachably connected with the flaw detection ring fixing unit (100) or the first output unit (200), and the flaw detection ring fixing unit (100) is driven to move close to the flaw detection ring translation unit (400) through coiling the tension steel coil (530).

18. The phased array ultrasonic flaw detector for heat exchange tubes according to claim 17, wherein a scale (531) is provided on the coil of tension steel (530).

19. The phased array ultrasonic flaw detector for heat exchange tubes according to claim 17, wherein a mounting box clamping block (540) is arranged at the end of the tension steel coil (530), and the mounting box clamping block (540) is clamped with the flaw detection ring fixing unit (100) or the first output unit (200).

20. A phased array ultrasonic inspection apparatus for heat exchange tubes according to any one of claims 1 to 19, wherein the inspection unit (300) is disposed inside the first tube collar (101).

21. A method for detecting a phased array ultrasonic flaw detector for a heat exchange tube according to any one of claims 1 to 20, comprising the steps of:

s1, coaxially installing a flaw detection ring fixing unit (100) and a flaw detection ring translation unit (400) on a heat exchange tube; arranging phased array probes (350) on the outer side of the heat exchange tube in a circumferential direction;

s2, simultaneously starting the first output unit (200) and the second output unit (500), and enabling the flaw detection unit (300) to move the flaw detection ring fixing unit (100) close to the flaw detection ring translation unit (400) while performing circular motion.