CN113533506A - External pipeline damage detection device and detection method thereof - Google Patents
External pipeline damage detection device and detection method thereof Download PDFInfo
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- CN113533506A CN113533506A CN202110713065.0A CN202110713065A CN113533506A CN 113533506 A CN113533506 A CN 113533506A CN 202110713065 A CN202110713065 A CN 202110713065A CN 113533506 A CN113533506 A CN 113533506A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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Abstract
The invention provides an external pipeline damage detection device and a detection method thereof. Wherein, external pipeline damage detection device, its characterized in that includes: the hydraulic pipe comprises a hydraulic main pipe and hydraulic branch pipes, the hydraulic branch pipes are arranged on the hydraulic main pipe, the hydraulic main pipe is also provided with a liquid injection pipe, and the hydraulic main pipe is annularly arranged outside the pipeline to be tested; the end part of the hydraulic branch pipe, which is far away from the hydraulic main pipe, is opened and is arranged towards the outer wall of the pipeline to be measured; the detection structure comprises a piston head and a piezoelectric sensor, the piston head is movably arranged in the hydraulic branch pipe, and the piezoelectric sensor is arranged on one side of the piston head, which is far away from the hydraulic main pipe; the driving structure is used for driving the piezoelectric sensor to rotate. The external pipeline damage detection device provided by the invention can be used for detecting from the outer side of the pipeline, the detection device cannot be separated due to high-temperature working conditions, and the detection accuracy is high and the detection range is wide.
Description
Technical Field
The invention relates to the technical field of pipeline detection, in particular to an external pipeline damage detection device and a detection method thereof.
Background
The pipeline is a channel for transporting gas or liquid, but the pipeline itself may be damaged during long-term use, and needs to be predicted in advance through detection so as to avoid gas or liquid in the pipeline from leaking out.
A sensor that is used for pipeline damage monitoring at present adopts bonding or annular gasbag to hold the mode tightly usually to fix at the pipeline surface, when the pipeline is high temperature operating condition, because viscose or gasbag are heated the performance degradation can not last effective work, and traditional mounting form is not applicable to the high temperature pipeline.
Obviously, the existing pipeline damage detection method cannot ensure that the detection device is attached to the detected object in a close range, so that the detection cannot be carried out or the detection result is inaccurate.
Disclosure of Invention
The invention provides an external pipeline damage detection device and a detection method thereof, which are used for solving the defects that the detection device cannot be attached to a detected object in a short distance in the existing pipeline damage detection method in the prior art, so that the detection cannot be carried out or the detection result is inaccurate, and realizing the improvement of the detection accuracy.
The invention provides an external pipeline damage detection device, which comprises:
the hydraulic pipe comprises a hydraulic main pipe and hydraulic branch pipes, the hydraulic branch pipes are arranged on the hydraulic main pipe, the hydraulic main pipe is also provided with a liquid injection pipe, and the hydraulic main pipe is annularly arranged outside the pipeline to be measured; the end part of the hydraulic branch pipe, which is far away from the hydraulic main pipe, is opened and is arranged towards the outer wall of the pipeline to be measured;
the detection structure comprises a piston head and a piezoelectric sensor, the piston head is movably arranged in the hydraulic branch pipe, and the piezoelectric sensor is arranged on one side of the piston head, which is far away from the hydraulic main pipe;
a drive structure for driving the piezoelectric sensor to rotate.
According to the external pipeline damage detection device provided by the invention, the piston head is provided with an embedded groove which is far away from the hydraulic main pipe, the piezoelectric sensor is embedded in the embedded groove, and the surface of the piezoelectric sensor which is far away from the embedded groove passes over the surface of the piston head which is far away from the hydraulic main pipe.
According to the external pipeline damage detection device provided by the invention, the piezoelectric sensor is connected with the embedded groove in a buckling mode.
According to the external pipeline damage detection device provided by the invention, a plurality of hydraulic branch pipes are arranged, the plurality of hydraulic branch pipes are uniformly and annularly arranged on the inner side of the hydraulic main pipe, a plurality of detection structures and a plurality of driving structures are also arranged, the plurality of detection structures correspond to the plurality of hydraulic branch pipes one by one, and the plurality of driving structures correspond to the plurality of detection structures one by one.
According to the external pipeline damage detection device provided by the invention, the center of the hydraulic main pipe and the center of the outer wall of the pipeline to be detected are concentrically arranged, and the lengths of the hydraulic branch pipes are the same.
According to the external pipeline damage detection device provided by the invention, a gap is formed between the hydraulic pipe and the outer wall of the pipeline to be detected.
According to the external pipeline damage detection device provided by the invention, the piezoelectric sensor is a guided wave sensor.
According to the external pipeline damage detection device provided by the invention, the piezoelectric sensor is fixed on the piston head, the driving structure comprises a piston rod and a motor, one end of the piston rod is fixedly connected with the piston head, the other end of the piston rod is connected with a rotating shaft of the motor, and the piston rod is arranged in the hydraulic branch pipe and extends along the length direction of the hydraulic branch pipe.
According to the external pipeline damage detection device provided by the invention, the hydraulic main pipe is provided with a through hole, the other end of the piston rod penetrates through the through hole, the inner wall of the through hole is provided with a sealing ring, the sealing ring is arranged around the periphery of the piston rod, and the motor is positioned outside the hydraulic pipe.
The invention also provides an external pipeline damage detection method, which comprises any one of the external pipeline damage detection devices, and comprises the following steps:
hydraulic pressure is injected through the liquid injection pipe, the hydraulic pressure enters the hydraulic branch pipes through the hydraulic main pipe, when the hydraulic pressure reaches a first preset value, the driving structure drives the piezoelectric sensor to rotate to form a first preset angle with the axis of the pipeline to be detected, then the hydraulic pressure is loaded until the hydraulic pressure reaches or is higher than a second preset value, and the piezoelectric sensor is tightly pressed to be tightly attached to the outer wall of the pipeline to be detected;
the piezoelectric sensor transmits the acquired first working condition signal to the terminal;
unloading the hydraulic pressure to the first preset value, driving the piezoelectric sensor to rotate to form a second preset angle with the axis of the pipeline to be detected by the driving structure, then loading the hydraulic pressure until the hydraulic pressure reaches or is higher than the second preset value, and pressing the piezoelectric sensor to be tightly attached to the outer wall of the pipeline to be detected;
the piezoelectric sensor transmits the acquired second working condition signal to the terminal;
and the terminal analyzes and obtains the damage state parameters of the pipeline to be detected according to the first working condition signal and the second working condition signal.
According to the external pipeline damage detection device and the detection method thereof, the piston head is driven to move through hydraulic pressure, so that the piezoelectric sensor can be tightly attached to the detected pipeline, the accuracy of pipeline damage detection is realized, and the direction of attachment of the piezoelectric sensor and the detected pipeline can be changed through the driving structure, so that the range of pipeline damage detection can be increased.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for 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 structural diagram of an external pipeline damage detection device provided by the present invention;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
reference numerals:
10: a pipe to be tested; 21: a hydraulic tube; 211: a hydraulic main pipe;
212: a hydraulic branch pipe; 213: a liquid injection pipe; 22: detecting the structure;
221: a piston head; 222: a piezoelectric sensor; 23: a drive structure;
231: a motor; 232: a piston rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, 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 external pipeline damage detection device and the detection method thereof according to the present invention are described below with reference to fig. 1 and 2.
Referring to fig. 1 and fig. 2, the external pipeline damage detecting device includes:
the hydraulic pipe 21 comprises a hydraulic main pipe 211 and hydraulic branch pipes 212, the hydraulic branch pipes 212 are arranged on the hydraulic main pipe 211, the hydraulic main pipe 211 is also provided with a liquid injection pipe 213, and the hydraulic main pipe 211 is annularly arranged outside the pipeline 10 to be tested; the end of the hydraulic branch pipe 212, which is away from the hydraulic main pipe 211, is open and is arranged towards the outer wall of the pipeline 10 to be tested;
the detection structure 22 comprises a piston head 221 and a piezoelectric sensor 222, the piston head 221 is movably arranged in the hydraulic branch pipe 212, and the piezoelectric sensor 222 is arranged on the side, facing away from the hydraulic manifold 211, of the piston head 221;
a driving structure 23, wherein the driving structure 23 is used for driving the piezoelectric sensor 222 to rotate.
The hydraulic pipe 21 is a sealed annular tubular structure, liquid can be injected into the hydraulic pipe 21 through the liquid injection pipe 213 to load hydraulic pressure, when the fluid flows to the hydraulic branch pipe 212, the piston head 221 embedded in the hydraulic branch pipe 212 can be pushed to move, and then the piezoelectric sensor 222 is driven to move, and due to the opening at the end part of the hydraulic branch pipe 212, the piezoelectric sensor 222 can be tightly attached to the inner wall of the pipeline 10 to be detected, so that detection is realized.
The piezoelectric sensor 222 can detect damage defects on the surface and inside of the sample through the emitted guided waves, and can realize accurate detection when the piezoelectric sensor is attached to a measured object, and preferably, the piezoelectric sensor 222 provided herein is a guided wave sensor.
In addition, the driving structure 23 can drive the piezoelectric sensor 222 to rotate, so that the attaching directions of the piezoelectric sensor 222 and the outer wall of the pipeline 10 to be detected are different, and since the piezoelectric sensor 222 emits a specific waveform, the direction of the waveform can be changed, so that the overall detection of multiple directions of the pipeline 10 to be detected can be increased, and the detection range of pipeline damage can be increased.
The terminal may be a computer terminal, which is connected to the piezoelectric sensor 222 in a telecommunication manner, such as a wired connection or a wireless connection, and will not be described in detail.
In this embodiment, through the removal of hydraulic drive piston head 221, and then can make piezoelectric sensor 222 closely laminate by survey pipeline 10, realize the accuracy that detects the pipeline damage, and, accessible drive structure 23 changes the direction that piezoelectric sensor 222 and by survey pipeline 10 laminate, thereby can improve the scope that pipeline damage detected, compare in prior art method, the external pipeline damage detection device that this application provided detects from the pipeline outside, through hydraulic drive's mode, can make piezoelectric sensor 222 closely laminate with by the outer wall of survey pipeline 10, can not make detection device break away from because of high temperature operating condition, and the accuracy of detection is high, the scope is wide.
Referring to fig. 2, in an embodiment of the present invention, in order to fix the piezoelectric sensor 222, the piston head 221 has an embedded groove facing away from the hydraulic manifold 211, the piezoelectric sensor 222 is embedded in the embedded groove, and a surface of the piezoelectric sensor 222 facing away from the embedded groove passes over a surface of the piston head 221 facing away from the hydraulic manifold 211.
The piezoelectric sensor 222 can be embedded in the embedded groove in a sticking or buckling connection manner, so that fixation is realized.
Specifically, in order to avoid melting of the adhesive due to high temperature during use, in this embodiment, the piezoelectric sensor 222 is in snap-fit connection with the embedded groove.
That is, the side of the piezoelectric sensor 222 is provided with a plurality of card holes, the side wall of the embedded groove is provided with a card, and when the piezoelectric sensor 222 is embedded into the embedded groove, the plurality of cards are respectively in the card holes, so that the connection of a mechanical structure is realized, and the separation due to high temperature is avoided. Of course, the connection structure here can also be connected by other mechanical structures, which are not described in detail.
Referring to fig. 1, in an embodiment of the present invention, a plurality of hydraulic branch pipes 212 are provided, a plurality of hydraulic branch pipes 212 are uniformly and annularly provided inside the hydraulic main pipe 211, a plurality of detection structures 22 and a plurality of driving structures 23 are also provided, a plurality of detection structures 22 correspond to a plurality of hydraulic branch pipes 212 one to one, and a plurality of driving structures 23 correspond to a plurality of detection structures 22 one to one.
Thus, when the hydraulic pressure is applied to the hydraulic pipe 21, the detection structure 22 of the plurality of hydraulic branch pipes 212 can be driven at the same time to detect the pipe damage, thereby further improving the range of the pipe damage detection. In addition, a plurality of hydraulic branch pipes 212 are provided in the ring-shaped hydraulic main pipe 211, so that the pipe detection device can be stably supported and prevented from falling. In other embodiments, when the additional hydraulic branch pipe 212 is not provided, a support structure may be additionally provided to ensure stability of the pipeline inspection device.
The number of the hydraulic branch pipes 212 is six.
By arranging the six hydraulic branch pipes 212 and correspondingly arranging the detection structure 22 and the driving structure 23, the detection of all the positions of the circumference of the outer wall of the pipeline can be basically realized, so that the efficiency of pipeline damage detection is improved. Of course, more hydraulic branch pipes 212 and corresponding detection structures 22 may be provided as needed, and will not be described in detail. When the six hydraulic branch pipes 212 are arranged, the piezoelectric sensor 222 is tightly attached to the inner wall of the detected pipeline 10, so that the whole detection device is in a claw shape, and the detection device is further prevented from toppling.
In addition, the center of the hydraulic main pipe 211 is arranged concentrically with the center of the outer wall of the measured pipe 10, and the lengths of the plurality of hydraulic branch pipes 212 are the same.
Therefore, the pressure of the piston head 221 at each position can be ensured to be the same, so that damage detection can be performed on a plurality of positions of the outer wall of the detected pipeline 10 at the same time, and the detection efficiency is further improved.
In another embodiment, the center of the hydraulic manifold 211 and the center of the outer wall of the measured pipe 10 are eccentrically arranged, so that when the hydraulic pipe 21 is sleeved outside the measured pipe 10, the position is fixed, the rotation is not easy, and stable detection is ensured.
Referring to fig. 1, in an embodiment of the present invention, a gap is formed between the hydraulic pipe 21 and an outer wall of the measured pipe 10.
That is, the end of the hydraulic branch pipe 212 is spaced from the outer wall of the pipe 10 to be tested when it is disposed toward the outer wall of the pipe 10 to be tested, so as to avoid damage to the outer wall of the pipe 10 to be tested when the detecting device is put in.
Further, can overlap at the tip of this hydraulic branch pipe 212 and establish the rubber packing ring, when placing this detection device, can avoid causing the damage to the pipeline outer wall that is surveyed on the one hand, on the other hand guarantees this detection device's stable placing, is difficult for empting.
In addition, since the outer wall of the pipe 10 to be tested may have other structures, in practical use, the testing device cannot be sleeved on the pipe 10 to be tested from one end of the pipe 10 to be tested, and therefore, the testing device needs to be placed directly from the tested position, so that, in one embodiment, the hydraulic manifold 211 comprises two semicircular sections, and both ends of each semicircular section are connected with both ends of the other semicircular section through a detachable structure, so that the integrated hydraulic manifold 211 can be spliced to place the testing device.
Specifically, above-mentioned detachable construction is including locating mouth of pipe and grafting section, and grafting is served and is had the passageway that supplies liquid to flow, and the grafting section can insert orificial inserting groove, and the lateral wall of grafting section is equipped with telescopic elastic component, and the inner wall of inserting groove has the fixed slot, after grafting section grafting and orificial inserting groove, in this elastic component embedding fixed slot to the realization is fixed. And, in order to guarantee sealed, be equipped with the sealing washer at the bottom of the tip of grafting end and fixed slot to avoid liquid to spill. In this embodiment, the two ends of each semicircular section are respectively provided with the pipe orifice and the insertion end. Of course, in other embodiments, the above-mentioned detachable structure may also be other practicable structures, and the details are not described herein.
Referring to fig. 1 and fig. 2, in an embodiment of the present invention, the piezoelectric sensor 222 is fixed on the piston head 221, the driving structure 23 includes a piston rod 232 and a motor 231, one end of the piston rod 232 is fixedly connected to the piston head 221, the other end of the piston rod 232 is connected to a rotating shaft of the motor 231, and the piston rod 232 is disposed in the hydraulic branch pipe 212 and extends along the length direction of the hydraulic branch pipe 212.
Therefore, the rotating shaft of the motor 231 can further drive the piston rod 232 to rotate, the rotation of the piston rod 232 drives the piston head 221 to rotate, and the piezoelectric sensor 222 is fixed on the piston head 221, so that the piezoelectric sensor 222 can be driven to rotate.
In another embodiment, the piezoelectric sensor 222 and the piston head 221 may be separated, that is, the piston head 221 is only attached to the inner wall of the measured pipe 10 by pushing the piezoelectric sensor 222 to move, and the specific structure is as follows, the piston head 221 has a through hole for the piston rod 232 to pass through, one end of the piston rod 232 is connected to the piezoelectric sensor 222, and the motor 231 is used to drive the piezoelectric sensor 222 to rotate, and the piston head 221 does not rotate, so that the piston head 221 and the piezoelectric sensor 222 do not need to be fixed, and the situation of high temperature operation does not need to be considered.
In addition, the hydraulic manifold 211 has a through hole, the other end of the piston rod 232 passes through the through hole, the inner wall of the through hole is provided with a sealing ring, the sealing ring is arranged around the outer periphery of the piston rod 232, and the motor 231 is located outside the hydraulic pipe 21.
Thus, the motor 231 is arranged outside the hydraulic pipe 21, so that the motor 231 can be prevented from being immersed in water, and the stable driving of the driving structure 23 is ensured.
Referring to fig. 1 and fig. 2, in the process that the piston head 221 drives the piezoelectric sensor 222 to move, it drives the piston rod 232 and the motor 231 to move at the same time, in order to ensure the stable movement of the motor 231, in an embodiment, a support pipe is disposed on the other side of the hydraulic manifold 211 located on the hydraulic branch pipe 212, and the motor 231 is disposed in the support pipe to ensure the stable movement.
Referring to fig. 1 and fig. 2, the present invention further provides an external pipeline damage detection method, including any one of the above external pipeline damage detection apparatuses, including the following steps:
hydraulic pressure is injected through the liquid injection pipe 213, the hydraulic pressure enters the hydraulic branch pipe 212 through the hydraulic main pipe 211, when the hydraulic pressure reaches a first preset value, the driving structure 23 drives the piezoelectric sensor 222 to rotate to form a first preset angle with the axis of the pipeline 10 to be tested, then the hydraulic pressure is loaded until the hydraulic pressure reaches or is higher than a second preset value, and the piezoelectric sensor 222 is tightly pressed to be tightly attached to the inner wall of the pipeline 10 to be tested;
the piezoelectric sensor 222 transmits the collected first working condition signal to the terminal;
unloading the hydraulic pressure to the first preset value, driving the piezoelectric sensor 222 to rotate to form a second preset angle with the axis of the measured pipeline 10 by the driving structure 23, and then loading the hydraulic pressure until the hydraulic pressure reaches or is higher than the second preset value, so that the piezoelectric sensor 222 is pressed to be tightly attached to the inner wall of the measured pipeline 10;
the piezoelectric sensor 222 transmits the collected second working condition signal to the terminal;
and the terminal analyzes and obtains the damage state parameters of the detected pipeline 10 according to the first working condition signal and the second working condition signal.
The terminal may be a computer terminal, which is connected to the piezoelectric sensor 222 in a telecommunication manner, such as a wired connection or a wireless connection, and will not be described in detail.
When the hydraulic pressure is the first preset value, the piezoelectric sensor 222 is not attached to the inner wall of the measured pipe 10, and the second preset value given here is determined according to the type of the piezoelectric sensor and the frequency of the excitation signal, so as to ensure that the piezoelectric sensor does not resonate under the excitation action of the preset frequency signal, and thus the stable operation can be achieved.
In this way, the piezoelectric sensor 222 is driven to rotate by the driving structure 23, so that the pipeline 10 can be attached to the inner wall of the pipeline in multiple directions, and the accuracy of pipeline damage detection is improved. Only two angles are given here, generally, one of the directions is the same direction as the radial direction of the measured pipeline 10, and mainly detects the pipeline damage condition in the radial direction of the measured pipeline 10, and the other direction is the same direction as the axial direction of the measured pipeline 10, and mainly detects the pipeline damage condition in the axial direction of the measured pipeline 10.
Further, the driving structure 23 can drive the piezoelectric sensor 222 to rotate in more directions, so as to further increase the detection range, which is not described in detail.
In addition, in an embodiment of the present invention, the number of the external pipeline damage detection devices is at least two, the distance between two adjacent external pipeline damage detection devices is movable, and the distance between every two external pipeline damage detection devices along the axial direction of the pipeline 10 to be detected is:
L1＝n*v1/4f1
where n is an odd number, n is 1,3,5,7 … …, v1 is the wave speed of the excitation signal of the piezoelectric sensor 222, and f1 is the frequency of the excitation signal of the piezoelectric sensor 222.
Because the detection range of the piezoelectric sensor 222 of each external pipeline damage detection device is limited, the external pipeline damage detection devices can be moved according to the distance, and the positions of the damage points can be known, when the two external pipeline damage detection devices are at the closest distance, the part of the pipeline 10 to be detected between the two external pipeline damage detection devices can be detected by the piezoelectric sensor 222 in the external pipeline damage detection devices, and the part of the pipeline 10 to be detected on the other side of the external pipeline damage detection devices cannot be detected by the other external pipeline damage detection device.
In this embodiment, the number of the external pipeline damage detection devices is two, the two external pipeline damage detection devices are independent of each other, but the piezoelectric sensor 222 of each external pipeline damage detection device is connected to the terminal in a telecommunication manner, so that the terminal can analyze the damage state parameters of the pipeline 10 to be detected according to the detection condition and judge the position of the damage point of the pipeline 10 to be detected.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides an external pipeline damage detection device which characterized in that includes:
the hydraulic pipe comprises a hydraulic main pipe and hydraulic branch pipes, the hydraulic branch pipes are arranged on the hydraulic main pipe, the hydraulic main pipe is also provided with a liquid injection pipe, and the hydraulic main pipe is annularly arranged outside the pipeline to be measured; the end part of the hydraulic branch pipe, which is far away from the hydraulic main pipe, is opened and is arranged towards the outer wall of the pipeline to be measured;
the detection structure comprises a piston head and a piezoelectric sensor, the piston head is movably arranged in the hydraulic branch pipe, and the piezoelectric sensor is arranged on one side of the piston head, which is far away from the hydraulic main pipe;
a drive structure for driving the piezoelectric sensor to rotate.
2. The external pipe damage detection device as recited in claim 1, wherein the piston head has an embedded groove facing away from the hydraulic manifold, the piezoelectric sensor is embedded in the embedded groove, and a surface of the piezoelectric sensor facing away from the embedded groove passes over a surface of the piston head facing away from the hydraulic manifold.
3. The external pipe damage detection device as recited in claim 2, wherein the piezoelectric sensor is snap-fit connected to the insertion slot.
4. The external pipeline damage detection device according to any one of claims 1 to 3, wherein a plurality of hydraulic branch pipes are provided, the plurality of hydraulic branch pipes are uniformly and annularly provided on the inner side of the hydraulic main pipe, a plurality of detection structures and a plurality of driving structures are provided, the plurality of detection structures correspond to the plurality of hydraulic branch pipes one to one, and the plurality of driving structures correspond to the plurality of detection structures one to one.
5. The external pipeline damage detection device as recited in claim 4, wherein the center of the hydraulic main pipe is concentrically arranged with the center of the outer wall of the pipeline to be detected, and the plurality of hydraulic branch pipes have the same length.
6. The external pipeline damage detection device as claimed in any one of claims 1 to 3, wherein a gap is formed between the hydraulic pipe and the outer wall of the pipeline to be detected.
7. The external pipeline damage detection device as recited in any one of claims 1 to 3, wherein the piezoelectric sensor is a guided wave sensor.
8. The external pipeline damage detection device according to any one of claims 1 to 3, wherein the piezoelectric sensor is fixed to the piston head, the driving structure includes a piston rod and a motor, one end of the piston rod is fixedly connected to the piston head, the other end of the piston rod is connected to a rotating shaft of the motor, and the piston rod is disposed in the hydraulic branch pipe and extends along a length direction of the hydraulic branch pipe.
9. The external pipeline damage detection device as recited in claim 8, wherein the hydraulic manifold has a through hole, the other end of the piston rod passes through the through hole, a sealing ring is disposed on an inner wall of the through hole, the sealing ring is disposed around an outer periphery of the piston rod, and the motor is disposed outside the hydraulic pipe.
10. An external pipeline damage detection method, characterized by comprising the external pipeline damage detection device according to any one of claims 1 to 9, and comprising the following steps:
hydraulic pressure is injected through the liquid injection pipe, the hydraulic pressure enters the hydraulic branch pipes through the hydraulic main pipe, when the hydraulic pressure reaches a first preset value, the driving structure drives the piezoelectric sensor to rotate to form a first preset angle with the axis of the pipeline to be detected, then the hydraulic pressure is loaded until the hydraulic pressure reaches or is higher than a second preset value, and the piezoelectric sensor is tightly pressed to be tightly attached to the outer wall of the pipeline to be detected;
the piezoelectric sensor transmits the acquired first working condition signal to the terminal;
unloading the hydraulic pressure to the first preset value, driving the piezoelectric sensor to rotate to form a second preset angle with the axis of the pipeline to be detected by the driving structure, then loading the hydraulic pressure until the hydraulic pressure reaches or is higher than the second preset value, and pressing the piezoelectric sensor to be tightly attached to the outer wall of the pipeline to be detected;
the piezoelectric sensor transmits the acquired second working condition signal to the terminal;
and the terminal analyzes and obtains the damage state parameters of the pipeline to be detected according to the first working condition signal and the second working condition signal.
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| CN202110713065.0A CN113533506A (en) | 2021-06-25 | 2021-06-25 | External pipeline damage detection device and detection method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114486495A (en) * | 2022-01-26 | 2022-05-13 | 中铁七局集团有限公司 | Pipeline internal pressure and deformation experimental device and detection method |
Citations (13)
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| CN114486495B (en) * | 2022-01-26 | 2024-04-12 | 中铁七局集团有限公司 | Method for detecting internal pressure and deformation of pipeline |
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