CN113533507A - Built-in pipeline damage detection device and detection method thereof - Google Patents
Built-in pipeline damage detection device and detection method thereof Download PDFInfo
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- CN113533507A CN113533507A CN202110713785.7A CN202110713785A CN113533507A CN 113533507 A CN113533507 A CN 113533507A CN 202110713785 A CN202110713785 A CN 202110713785A CN 113533507 A CN113533507 A CN 113533507A
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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
- G01N29/04—Analysing solids
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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
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
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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
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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Abstract
The invention provides a built-in pipeline damage detection device and a detection method thereof. Wherein, built-in pipeline damage detection device includes: the hydraulic pipe is used for introducing hydraulic fluid; the hydraulic pipe comprises a hydraulic branch pipe, and the hydraulic branch pipe is arranged in the pipeline to be measured; one end of the hydraulic branch pipe extends to the inner wall of the measured pipeline; 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 surface of the piston head facing the inner wall of the pipeline to be detected; the driving end of the rotary driving structure is connected with the piston head, the piezoelectric sensor is arranged at one end, facing the inner wall of the measured pipeline, of the piston head, or the driving end of the rotary driving structure penetrates through the piston head to be connected with the piezoelectric sensor. The built-in pipeline damage detection device provided by the invention can be used for detecting from the inner side of a pipeline, and has high detection accuracy and wide detection range.
Description
Technical Field
The invention relates to the technical field of pipeline detection, in particular to a built-in 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.
Currently, in pipeline damage detection construction, a radiation inspection method and an ultrasonic inspection method are generally adopted. For the pipeline passing through the partition wall structure, when the construction space on one side of the partition wall structure is insufficient, the damage detection construction can be carried out only on the other side of the partition wall structure, and the ultrasonic flaw detection method cannot be applied because the damage part cannot be approached; when other metal parts are directly attached to the pipeline on one side of the partition wall with insufficient construction space, the detection result of the radiographic inspection method is inaccurate due to the interference of the metal parts.
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 a built-in 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 a built-in pipeline damage detection device, which comprises:
the hydraulic pipe is used for introducing hydraulic fluid; the hydraulic pipe comprises a hydraulic branch pipe, and the hydraulic branch pipe is arranged in the pipeline to be measured; one end of the hydraulic branch pipe extends to the inner wall of the measured pipeline;
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 surface of the piston head facing the inner wall of the pipeline to be detected;
the driving end of the rotary driving structure is connected with the piston head, the piezoelectric sensor is arranged at one end, facing the inner wall of the measured pipeline, of the piston head, or the driving end of the rotary driving structure penetrates through the piston head to be connected with the piezoelectric sensor.
According to the built-in pipeline damage detection device provided by the invention, the hydraulic main pipe further comprises a plurality of hydraulic branch pipes, the plurality of hydraulic branch pipes are arranged on the hydraulic main pipe and extend along the radial direction of the inner wall of the pipeline to be detected, the hydraulic main pipe is further provided with a liquid injection pipe, the plurality of detection structures and the plurality of rotation driving structures are also arranged, the plurality of detection structures correspond to the plurality of hydraulic branch pipes one to one, and the plurality of rotation driving structures correspond to the plurality of detection structures one to one.
According to the built-in pipeline damage detection device provided by the invention, the hydraulic main pipe is an annular pipeline, and the plurality of hydraulic branch pipes are uniformly arranged on the periphery of the hydraulic main pipe at intervals.
According to the built-in pipeline damage detection device provided by the invention, the center of the hydraulic main pipe and the center of the inner wall of the pipeline to be detected are concentrically arranged, and the lengths of the hydraulic branch pipes are the same.
According to the built-in pipeline damage detection device provided by the invention, a gap is formed between the hydraulic pipe and the inner wall of the pipeline to be detected.
According to the built-in pipeline damage detection device provided by the invention, the piezoelectric sensor is a guided wave sensor.
According to the built-in pipeline damage detection device provided by the invention, the piezoelectric sensor is fixed on the piston head, the rotary driving structure comprises the piston rod and the 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 built-in 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.
According to the built-in pipeline damage detection device provided by the invention, the piston head is provided with an embedded groove which is far away from a hydraulic manifold, 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 manifold.
The present invention also provides a method for detecting a damage in a pipe, the method including:
injecting hydraulic fluid into the hydraulic branch pipe, when the pressure of the hydraulic fluid reaches a first preset value, driving the piezoelectric sensor to rotate to form a first preset angle with the axis of the pipeline to be detected by the rotary driving structure, then loading hydraulic pressure until the hydraulic pressure reaches or is higher than a second preset value, and pressing the piezoelectric sensor to be tightly attached to the inner wall of the pipeline to be detected;
the piezoelectric sensor transmits the acquired first working condition signal to the terminal;
unloading the pressure of the hydraulic fluid to the first preset value, driving the piezoelectric sensor to rotate to form a second preset angle with the axis of the measured pipeline by the rotary driving structure, then loading the hydraulic fluid until the pressure of the hydraulic fluid reaches or is higher than the second preset value, and pressing the piezoelectric sensor to be tightly attached to the inner wall of the measured pipeline;
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 built-in 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 attachment direction of the piezoelectric sensor and the detected pipeline can be changed through the rotary driving structure, so that the pipeline damage detection range 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 a built-in 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 rotation driving 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 built-in pipe damage detection apparatus and the detection method thereof of the present invention will be described with reference to fig. 1 and 2.
Referring to fig. 1 and fig. 2, the built-in pipeline damage detecting apparatus includes:
the hydraulic pipe 21 is used for introducing hydraulic fluid into the hydraulic pipe 21; the hydraulic branch pipe 212 of the hydraulic pipe 21 is arranged in the pipeline 10 to be tested; one end of the hydraulic branch pipe 212 extends to the inner wall of the pipeline to be tested;
the detection structure 22 comprises a piston head 221 and a piezoelectric sensor 222, wherein the piston head 221 is movably arranged in the hydraulic branch pipe 212, and the piezoelectric sensor 222 is arranged on one side of the piston head 221 facing the inner wall of the pipe to be detected;
the driving end of the rotary driving structure 23 is connected with the piston head 221, the piezoelectric sensor 222 is arranged at one end of the piston head facing the inner wall of the measured pipeline, or the driving end of the rotary driving structure 23 passes through the piston head 221 and is connected with the piezoelectric sensor 222.
The hydraulic pipe 21 is a sealed tubular structure, and can inject liquid into the hydraulic pipe 21 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 because the end part of the hydraulic branch pipe 212 is opened, the piezoelectric sensor 222 can be tightly attached to the inner wall of the pipeline 10 to be detected, so that the 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 rotation driving structure 23 can drive the piezoelectric sensor 222 to rotate, so that the adhering directions of the piezoelectric sensor 222 and the inner 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 pipeline damage detection range can be increased.
In this embodiment, the piston head 221 is driven to move by hydraulic pressure, so that the piezoelectric sensor 222 can be tightly attached to the pipe 10 to be detected, and the accuracy of detecting the pipe damage is realized, and the direction in which the piezoelectric sensor 222 is attached to the pipe 10 to be detected can be changed by rotating the driving structure 23, so that the range of detecting the pipe damage can be increased.
Referring to fig. 1, in an embodiment of the present invention, the hydraulic main pipe further includes a plurality of hydraulic branch pipes 211, the plurality of hydraulic branch pipes 212 are disposed on the hydraulic main pipe 211 and extend along a radial direction of an inner wall of a measured pipe, the hydraulic main pipe 211 is further provided with a liquid injection pipe 213, the plurality of detection structures 22 and the plurality of rotation driving structures 23 are also provided, the plurality of detection structures 22 correspond to the plurality of hydraulic branch pipes 212 one to one, and the plurality of rotation driving structures 23 correspond to the plurality of detection structures 22 one to one.
Thus, when the hydraulic fluid 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 perform the pipe damage detection, thereby further improving the range of the pipe damage detection.
Specifically, in this embodiment, the hydraulic manifold 211 is an annular pipe, and the plurality of hydraulic branch pipes 212 are uniformly spaced around the periphery of the hydraulic manifold 211.
In this way, when loading hydraulic fluid, it can be ensured that each branch pipe is loaded with pressure at the same time, and the hydraulic branch pipes 212 are arranged towards the inner wall of the measured pipeline 10, so that the piezoelectric sensor 222 can be tightly attached to the inner wall of the measured pipeline 10. In other embodiments, the hydraulic manifold 211 may be a coil-wound pipe, and the plurality of hydraulic branch pipes 212 are disposed on the hydraulic manifold 211, which will not be described in detail.
The hydraulic manifold 211 is a ring-shaped pipe structure, and the number of the hydraulic branch pipes 212 is six.
By arranging six hydraulic branch pipes 212 and correspondingly arranging the detection structure 22 and the rotary driving structure 23, the detection of all the positions of the circumference of the inner 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 prevented from toppling.
In addition, the center of the hydraulic manifold 211 is concentrically arranged with the center of the inner wall of the pipe 10 to be measured, 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 inner 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 is eccentric to the center of the inner wall of the measured pipe 10, so that when the hydraulic pipe 21 is placed in the measured pipe 10, the position is fixed, the pipe is not easy to rotate, 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 inner wall of the measured pipeline 10.
That is, the end of the hydraulic branch pipe 212 is spaced from the inner wall of the pipe 10 to be tested when it is disposed toward the inner wall of the pipe 10 to be tested, so as to avoid damage to the inner 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 putting into this detection device, can avoid causing the damage to the pipeline inner wall that is surveyed on the one hand, on the other hand guarantees this detection device's stable placing, is difficult for empting.
Referring to fig. 1 and 2, in an embodiment of the present invention, the piezoelectric sensor 222 is fixed on the piston head 221, the rotary 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, 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 drives the piezoelectric sensor 222 to rotate, but the piston head 221 does not rotate.
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 rotary driving structure 23 can be ensured.
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.
Referring to fig. 1, 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 tube is disposed on the other side of the hydraulic branch tube 212 of the hydraulic manifold 211, and the motor 231 is disposed in the support tube to ensure the stable movement.
Further, in the structure that the hydraulic manifold 211 is an annular pipe, the plurality of support pipes are communicated with each other through an intermediate pipe, the intermediate pipe is located in the center of the hydraulic manifold 211 and is arranged along the axial direction of the measured pipe 10, the intermediate pipe can extend out of the measured pipe 10, the intermediate pipe can stably support the built-in pipe damage detection device, the inclination of the pipe damage detection device is avoided, and the connection line of the power supply motor 231 of the intermediate pipe can penetrate out to control the motor 231.
Referring to fig. 1 and fig. 2, the present invention further provides a method for detecting the built-in pipeline damage detecting device, including:
injecting hydraulic fluid into the hydraulic branch pipe 212, when the pressure of the hydraulic fluid reaches a first preset value, the rotary driving structure 23 drives the piezoelectric sensor 222 to rotate to form a first preset angle with the axis of the measured pipeline 10, then loading the hydraulic fluid until the pressure of the hydraulic fluid reaches or is higher than a second preset value, and 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 acquired first working condition signal to a terminal;
unloading the pressure of the hydraulic fluid 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 rotary driving structure 23, and then loading the hydraulic fluid until the pressure of the hydraulic fluid reaches or is higher than the second preset value, so that the piezoelectric sensor 222 is tightly 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 pressure of the hydraulic fluid 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 that the piezoelectric sensor is not resonated under the excitation action of the preset frequency signal, and can stably work.
In this way, the piezoelectric sensor 222 is driven to rotate by the rotation 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 rotation 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 built-in pipeline damage detecting devices is at least two, the distance between two adjacent built-in pipeline damage detecting devices is movable, and the distance between every two built-in pipeline damage detecting 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.
Since the detection range of the piezoelectric sensor 222 of each built-in pipeline damage detection device is limited, the built-in pipeline damage detection devices can be moved according to the distance, so that the positions of the damaged points can be known, when the two built-in pipeline damage detection devices are at the closest distance, the part of the pipeline 10 to be detected between the two built-in pipeline damage detection devices can be detected by the piezoelectric sensor 222 in the pipeline damage detection devices, and the part of the pipeline 10 to be detected on the other side of the two built-in pipeline damage detection devices cannot be detected by the other built-in pipeline damage detection device.
In this embodiment, the number of the built-in pipeline damage detection devices is two, the two built-in pipeline damage detection devices are independent from each other, but the piezoelectric sensor 222 of each built-in 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. A built-in pipeline damage detection device, characterized by includes:
the hydraulic pipe is used for introducing hydraulic fluid; the hydraulic pipe comprises a hydraulic branch pipe, and the hydraulic branch pipe is arranged in the pipeline to be measured; one end of the hydraulic branch pipe extends to the inner wall of the measured pipeline;
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 surface of the piston head facing the inner wall of the pipeline to be detected;
the driving end of the rotary driving structure is connected with the piston head, the piezoelectric sensor is arranged at one end, facing the inner wall of the measured pipeline, of the piston head, or the driving end of the rotary driving structure penetrates through the piston head to be connected with the piezoelectric sensor.
2. The device for detecting damage to an internal pipeline according to claim 1, wherein the hydraulic manifold further comprises a plurality of hydraulic branch pipes, the plurality of hydraulic branch pipes are arranged on the hydraulic manifold and extend along a radial direction of an inner wall of the pipeline to be detected, a liquid injection pipe is further arranged on the hydraulic manifold, the plurality of detection structures and the plurality of rotation driving structures are also arranged, the plurality of detection structures correspond to the plurality of hydraulic branch pipes one to one, and the plurality of rotation driving structures correspond to the plurality of detection structures one to one.
3. The device of claim 2, wherein the hydraulic manifold is a ring-shaped pipe, and the plurality of hydraulic branch pipes are arranged around the periphery of the hydraulic manifold at regular intervals.
4. The built-in pipe damage detecting device according to claim 3, wherein the center of the hydraulic manifold is concentrically arranged with the center of the inner wall of the pipe to be detected, and the plurality of hydraulic branch pipes have the same length.
5. The built-in pipe damage detection device according to any one of claims 1 to 4, wherein a gap is formed between the hydraulic pipe and an inner wall of the pipe to be detected.
6. The built-in pipe damage detection device according to any one of claims 1 to 4, wherein the piezoelectric sensor is a guided wave sensor.
7. The device for detecting damage to an internal pipe according to any one of claims 1 to 5, wherein the piezoelectric sensor is fixed to the piston head, the rotary driving structure comprises 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.
8. The apparatus according to claim 7, 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.
9. The device of any of claims 1-5, wherein the piston head has an insertion slot facing away from the hydraulic manifold, the piezoelectric sensor is inserted into the insertion slot, and a surface of the piezoelectric sensor facing away from the insertion slot passes over a surface of the piston head facing away from the hydraulic manifold.
10. A method for detecting a built-in pipe damage detecting device according to any one of claims 1 to 9, comprising:
injecting hydraulic fluid into the hydraulic branch pipe, when the pressure of the hydraulic fluid reaches a first preset value, driving the piezoelectric sensor to rotate to form a first preset angle with the axis of the pipeline to be tested by the rotary driving structure, then loading the hydraulic fluid until the pressure of the hydraulic fluid reaches or is higher than a second preset value, and pressing the piezoelectric sensor to be tightly attached to the inner wall of the pipeline to be tested;
the piezoelectric sensor transmits the acquired first working condition signal to the terminal;
unloading the pressure of the hydraulic fluid to the first preset value, driving the piezoelectric sensor to rotate to form a second preset angle with the axis of the measured pipeline by the rotary driving structure, then loading the hydraulic fluid until the pressure of the hydraulic fluid reaches or is higher than the second preset value, and pressing the piezoelectric sensor to be tightly attached to the inner wall of the measured pipeline;
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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| 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 |
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