CN115638751A - Detection system and detection method for pipeline wall thickness - Google Patents
Detection system and detection method for pipeline wall thickness Download PDFInfo
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- CN115638751A CN115638751A CN202110815965.6A CN202110815965A CN115638751A CN 115638751 A CN115638751 A CN 115638751A CN 202110815965 A CN202110815965 A CN 202110815965A CN 115638751 A CN115638751 A CN 115638751A
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Abstract
The invention provides a detection system and a detection method for the wall thickness of a pipeline, wherein the detection system for the wall thickness of the pipeline comprises the following steps: CPU, first ultrasonic transducer, second ultrasonic transducer and material are the same with the pipeline and fix the sound velocity detection piece on the pipeline, and the sound velocity detection piece is including detecting the body. First ultrasonic probe and second ultrasonic probe all are connected with the CPU electricity, detect the body and have the first surface and the second surface that carry on the back mutually, are provided with the recess on the first surface, and the recess has the bottom surface parallel with the second surface, has set distance d1 between bottom surface and the second surface, and first ultrasonic probe corresponds the recess, and second ultrasonic probe corresponds the outer wall of pipeline. The invention has the advantages that the sound velocity of ultrasonic waves can be monitored in real time in the detection process of the wall thickness of the pipeline, so that the detection result of the wall thickness of the pipeline is more accurate.
Description
Technical Field
The invention relates to the technical field of acoustic emission detection, in particular to a system and a method for detecting the wall thickness of a pipeline.
Background
The pipeline can appear the condition of ageing, deformation or corruption after long-time operation, makes the wall thickness index of pipeline can't satisfy the safety requirement again, leads to the oil gas pipeline occurence of failure, can cause huge economic loss even. Therefore, the distributed whole pipeline real-time remote monitoring of the wall thickness of the key weak part of the whole pipeline (pipe network) provides technical support for the networked and intelligent health monitoring and early warning of the pipeline, and the safety of oil and gas pipeline transportation is ensured.
The wall thickness detection by the ultrasonic pulse reflection method is a conventional means for realizing the regular detection of the wall thickness of the pipeline, and has the advantages of high measurement precision, convenience in installation and use, low price, safety, reliability and the like, so that the wall thickness detection method is widely applied to the field of thickness measurement. In practical application, however, the wall thickness of the pipeline is measured at regular single points by adopting a portable ultrasonic thickness gauge with a single straight probe, and the sound velocity is manually input or selected by an interface, so that different real-time online monitoring is realized, the influence of the environmental temperature is large, and the measurement precision is low. Especially when the wall thickness change of an in-service pipeline is detected in real time by a distributed full pipeline, the ultrasonic propagation speed can be directly influenced by the factors due to the change of the size, the material and the temperature of the in-service pipeline along with time, place, oil products and the like, and the wall thickness measurement precision is further reduced.
Disclosure of Invention
The invention aims to provide a pipeline wall thickness detection system and a pipeline wall thickness detection method, which can monitor the sound velocity of ultrasonic waves in real time in the pipeline wall thickness detection process, so that the pipeline wall thickness detection result is more accurate.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a system for detecting pipe wall thickness, comprising: the sound velocity detection device comprises a CPU, a first ultrasonic probe, a second ultrasonic probe and a sound velocity detection block, wherein the sound velocity detection block is made of the same material as the pipeline and is fixed on the pipeline, and comprises a detection body;
the first ultrasonic probe and the second ultrasonic probe are electrically connected with the CPU, the detection body is provided with a first surface and a second surface which are opposite, a groove is arranged on the first surface, the groove is provided with a bottom surface parallel to the second surface, a set distance d1 exists between the bottom surface and the second surface, the first ultrasonic probe corresponds to the groove, so that the first ultrasonic probe can transmit ultrasonic waves towards the bottom surface and the second surface along a direction perpendicular to the bottom surface, simultaneously receive the ultrasonic waves reflected by the bottom surface and the second surface and send the time for receiving the ultrasonic waves reflected by the bottom surface and the second surface to the CPU, and the CPU calculates the transmission sound velocity c of the ultrasonic waves in the detection body according to the time difference delta t1 of the first ultrasonic probe receiving the ultrasonic waves reflected by the bottom surface and the second surface and the set distance d1 between the bottom surface and the second surface;
the second ultrasonic probe corresponds the outer wall of pipeline, so that the second ultrasonic probe can follow radially to the pipeline transmission ultrasonic wave, the simultaneous reception the ultrasonic wave of the outer wall and the inner wall reflection of pipeline, and will receive the time of the ultrasonic wave of the outer wall and the inner wall reflection of pipeline sends to CPU, CPU is according to receiving time difference delta t2 and the ultrasonic wave of the outer wall and the inner wall reflection of pipeline are in detect this internal transmission sound velocity c and calculate the wall thickness d2 of pipeline.
Preferably, the number of the second ultrasonic probes is at least two, and the positions of any two of the second ultrasonic probes corresponding to the outer wall of the pipeline are different from each other.
Preferably, a display is also included;
the display is electrically connected with the CPU, the CPU can send the calculated transmission sound velocity c of the ultrasonic waves in the detection body to the display for displaying, and/or the CPU can send the calculated wall thickness d2 of the pipeline to the display for displaying.
Preferably, the device also comprises a temperature sensor;
the first ultrasonic probe collects temperature information of the detection body in real time and sends the information to the CPU, the temperature sensor is arranged on the outer wall of the pipeline and is electrically connected with the CPU, the temperature sensor collects the temperature information of the pipeline in real time and sends the information to the CPU, and the CPU sends the received temperature information of the detection body and the temperature information of the pipeline to the display for display.
Preferably, the system further comprises a memory;
the memory is electrically connected with the CPU, the CPU can send the calculated transmission sound velocity c of the ultrasonic wave in the detection body to the memory for storage, and/or the CPU can send the calculated wall thickness d2 of the pipeline to the memory for storage.
Preferably, the sound speed detection block further includes: the fixing plate, the connecting plate and the stud are further included;
the fixing plate is parallel to the first surface, and one end of the fixing plate is fixedly connected to the detection body through the connecting plate;
the fixing plate is provided with a screw hole, the axis of the screw hole is perpendicular to the first surface and matched with the stud, the stud is in threaded connection with the screw hole and is abutted against the first ultrasonic probe, and the first ultrasonic probe is pressed in the groove on the first surface.
Preferably, the sound speed detection block further includes: the first clamping part and the second clamping part;
the first clamping portion and the second clamping portion are fixedly connected to the second surface and are arranged at intervals, so that the pipeline can be clamped through the first clamping portion and the second clamping portion;
when the first clamping portion and the second clamping portion clamp the pipeline, a gap exists between the pipeline and the second surface.
Preferably, first joint portion has first clamping face, second joint portion has the second clamping face, works as first joint portion with the centre gripping of second joint portion during the pipeline, first joint portion passes through the laminating of first clamping face is in on the outer wall of pipeline, second joint portion passes through the laminating of second clamping face is in on the outer wall of pipeline, and first clamping face with the second clamping face be with pipeline outer wall shape assorted curved surface.
A detection method of the wall thickness of a pipeline, a detection system of the wall thickness of the pipeline using any technical characteristics, comprises the following steps:
s100, the first ultrasonic probe emits ultrasonic waves towards the bottom surface and the second surface of the groove along the direction perpendicular to the bottom surface of the groove and receives the ultrasonic waves reflected from the bottom surface and the second surface of the groove respectively;
s200, the first ultrasonic probe sends the time of the ultrasonic wave reflected by the bottom surface of the receiving groove and the time of receiving the ultrasonic wave reflected by the second surface to a CPU;
s300, the CPU calculates the transmission sound velocity c of the ultrasonic wave in the detection body according to the time difference delta t1 of the first ultrasonic probe receiving the ultrasonic wave reflected by the bottom surface of the groove and the ultrasonic wave reflected by the second surface respectively and the set distance d1 between the bottom surface of the groove and the second surface, wherein c =2d 1/delta t1;
s400, the second ultrasonic probe transmits ultrasonic waves to the pipeline along the radial direction of the pipeline and respectively receives the ultrasonic waves reflected from the outer wall and the inner wall of the pipeline;
s500, the second ultrasonic probe sends the time for receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline to a CPU;
s600, the CPU calculates the wall thickness d2 of the pipeline according to the time difference delta t2 of the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline received by the second ultrasonic probe and the transmission sound velocity c of the ultrasonic waves in the detection body, wherein d2= c delta t2/2.
Preferably, in the system for detecting the wall thickness of the pipeline, the number of the second ultrasonic probes is at least two, and the positions of any two second ultrasonic probes corresponding to the outer wall of the pipeline are different from each other.
In step S400, at least two second ultrasonic probes emit ultrasonic waves to different positions of the pipeline along a radial direction of the pipeline, and respectively receive ultrasonic waves reflected from outer walls of the different positions of the pipeline and inner walls of the pipeline;
in step S500, at least two second ultrasonic probes respectively send time for receiving ultrasonic waves reflected by the outer wall and the inner wall of the pipe at different positions to the CPU;
in step S600. And the CPU calculates the wall thickness d2 of the pipeline at different positions according to the time difference delta t2 of the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline received by at least the second ultrasonic probe.
According to the pipeline wall thickness detection system and the pipeline wall thickness detection method, the CPU is adopted to calculate the transmission sound velocity c of the ultrasonic wave in the detection body according to the time difference delta t1 of the first ultrasonic probe for receiving the ultrasonic wave reflected by the bottom surface and the second surface and the set distance d1 between the bottom surface and the second surface, and the CPU calculates the wall thickness d2 of the pipeline according to the time difference delta t2 of the ultrasonic wave reflected by the outer wall and the inner wall of the pipeline and the transmission sound velocity c of the ultrasonic wave in the detection body.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a system for detecting a wall thickness of a pipe according to the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a flow chart of the method for detecting the wall thickness of the pipeline according to the present invention.
Wherein: 1-a pipeline; 2-a CPU; 3-a first ultrasound probe; 4-a second ultrasonic probe; 5-the speed of sound is detected quickly; 51-a detection body; 511-a first surface; 512-a second surface; 513-grooves; 514-bottom surface; 52-a fixing plate; 521-screw holes; 53-connecting plate; 54-a stud; 55-a first clamping part; 551-first clamping surface; 56-a second clamping part; 561-second clamping surface; 6-a display; 7-temperature monitor; 8-memory.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the detecting system and the detecting method for detecting the wall thickness of the pipeline according to the present invention are further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
For the sake of understanding, the principle of the ultrasonic measurement pipe will be briefly described, and the wall thickness of the ultrasonic measurement pipe is mainly measured according to the principle that when ultrasonic waves propagate between different media, reflection occurs from one medium to the surface of another medium. The ultrasonic transducer emits ultrasonic waves with a certain frequency, the ultrasonic waves can be transmitted forwards in a medium, the transmission speed of the ultrasonic waves in the same medium is basically the same, but when the ultrasonic waves pass through the junctions of different transmission media, the phenomena of reflection and transmission of the ultrasonic waves can occur, and the reflected ultrasonic waves are received by the transducer. The thickness of the propagation medium can be indirectly obtained by accurately measuring the flight time of the ultrasonic waves in the measured object.
Example one
As shown in fig. 1 and 2, a system for detecting the wall thickness of a pipeline includes: the sound velocity detection device comprises a CPU2, a first ultrasonic probe 3, a second ultrasonic probe 4 and a sound velocity detection block 5 which is made of the same material as the pipeline 1 and is fixed on the pipeline 1, wherein the sound velocity detection block 5 comprises a detection body 51;
the first ultrasonic probe 3 and the second ultrasonic probe 4 are electrically connected to the CPU2, the inspection body 51 has a first surface 511 and a second surface 512 which are opposite to each other, a groove 513 is provided on the first surface 511, the groove 513 has a bottom surface 514 parallel to the second surface 512, a set distance d1 exists between the bottom surface 514 and the second surface 512, and the first ultrasonic probe 3 corresponds to the groove 513, so that the first ultrasonic probe 3 can emit ultrasonic waves toward the bottom surface 514 and the second surface 512 in a direction perpendicular to the bottom surface 514 and receive the ultrasonic waves reflected by the bottom surface 514 and the second surface 512. The second ultrasonic probe 4 corresponds to an outer wall of the pipeline 1, so that the second ultrasonic probe 4 can transmit ultrasonic waves to the pipeline 1 in a radial direction of the pipeline 1 while receiving ultrasonic waves reflected by the outer wall and the inner wall of the pipeline 1. The frequency of the ultrasonic waves emitted by the first ultrasonic probe 3 and the second ultrasonic probe 4 is more than or equal to 20000Hz, and the detection frequency of a common pipeline is approximately 2 MHz-7.5 MHz. The center frequency of the ultrasonic wave adopted by the design can be 5MHz.
In operation, the first ultrasonic probe 3 sends the time for receiving the ultrasonic waves reflected by the bottom surface 514 and the second surface 512 to the CPU2, and the CPU2 calculates the transmission sound velocity c of the ultrasonic waves in the detection body 51 according to the time difference Δ t1 between the first ultrasonic probe 3 and the time for receiving the ultrasonic waves reflected by the bottom surface 514 and the second surface 512 and the set distance d1 between the bottom surface 514 and the second surface 512, wherein the specific calculation formula is c =2d1/Δ t1. The second ultrasonic probe 4 transmits the time for receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipe 1 to the CPU2, and the CPU2 calculates the wall thickness d2 of the pipe 1 based on the time difference Δ t2 between the ultrasonic waves reflected by the outer wall and the inner wall of the pipe 1 and the propagation sound velocity c of the ultrasonic waves in the detection body 51 (since the detection body 51 and the pipe 1 are made of the same material, it can be considered that the propagation sound velocity of the ultrasonic waves in the pipe 1 is also c), and the specific calculation formula is d2= c Δ t2/2.
Therefore, the sound velocity of ultrasonic waves can be monitored in real time in the detection process of the wall thickness of the pipeline, and the detection result of the wall thickness of the pipeline is more accurate.
Specifically, as shown in fig. 1, the number of the second ultrasonic probes 4 is at least two, and may be 15, for example. The positions of any two second ultrasonic probes 4 corresponding to the outer wall of the pipeline 1 are different from each other. At this time, the CPU2 can simultaneously calculate the wall thickness d2 of the pipe 1 at the positions corresponding to the plurality of second ultrasonic probes 4, thereby improving the efficiency of the detection work.
Further, as shown in fig. 1, a display 6 is further included, the display 6 is electrically connected to the CPU2, the CPU2 can transmit the calculated transmission sound velocity c of the ultrasonic wave in the detection body 51 to the display 6 for displaying, and/or the CPU2 can transmit the calculated wall thickness d2 of the pipe 1 to the display 6 for displaying. So that the operator can obtain the detection result directly by looking at the display 6. When the number of the second ultrasonic probes 4 is at least two, the CPU2 may simultaneously transmit the calculation result of the wall thickness d2 of the pipe 1 at the position corresponding to the plurality of second ultrasonic probes 4 to the display 6 for display.
As an embodiment, as shown in fig. 1, a temperature sensor 7 is further included;
first ultrasonic probe 3 gathers the temperature information who detects body 51 in real time to with this information transmission to CPU2, temperature sensor 7 sets up on the outer wall of pipeline 1, and is connected with CPU2 electricity, and temperature sensor 7 gathers the temperature information of pipeline 1 in real time, and with this information transmission to CPU2, CPU2 shows on sending the temperature information of received pipeline 1 to display 6. Like this can be in the measurement process to pipeline 1 wall thickness, operating personnel can observe in real time whether the temperature that detects body 51 temperature and pipeline 1 is unanimous, if inconsistent appears, then need check whether first ultrasonic transducer 3 breaks down or whether the mounted position of sound velocity detection piece 5 is correct scheduling problem, ensure to detect that body 51 temperature is unanimous with the temperature of pipeline 1 to guarantee measuring result's accuracy nature.
As an implementable embodiment, a memory 8 is also included. The memory 8 is electrically connected to the CPU2, and the CPU2 can transmit the calculated transmission sound velocity c of the ultrasonic wave in the detection body 51 to the memory 8 for storage, and/or the CPU2 can transmit the calculated wall thickness d2 of the pipe 1 to the memory 8 for storage. For future inquiry and comparison.
Example two
On the basis of the first embodiment, as shown in fig. 2, the sound speed detection block 5 further includes: also included are a retaining plate 52, a connecting plate 53 and a stud 54. The fixing plate 52 is parallel to the first surface 511, and one end is fixedly connected to the detecting body 51 through a connecting plate 53. The fixing plate 52 is provided with a screw hole 521 having an axis perpendicular to the first surface 511 and matching with the stud 54, and the stud 54 is screwed into the screw hole 521 and abuts against the first ultrasonic probe 3 to press the first ultrasonic probe 3 against the recess 513 on the first surface 511. This enables the first ultrasonic probe 3 to maintain a stable corresponding relationship with the recess 513, thereby ensuring the accuracy of the measurement result. In actual manufacturing, the fixing plate 52, the connecting plate 53 and the detecting body 51 may be integrally formed, but the present invention is not limited thereto, and any other technical means may be adopted to achieve the object of the present invention.
As an implementation, the sound speed detection block 5 further includes: a first snap-in portion 55 and a second snap-in portion 56. The first clamping portion 55 and the second clamping portion 56 are both fixedly connected to the second surface 512 and are arranged at intervals, so that the pipeline 1 can be clamped by the first clamping portion 55 and the second clamping portion 56. When the first and second clamping portions 55 and 56 clamp the pipe 1, a gap exists between the pipe 1 and the second surface 512. This enables the sound speed detection block 5 to be stably mounted on the pipe 1. And a gap exists between the pipeline 1 and the second surface 512, so that the ultrasonic wave emitted by the first ultrasonic probe 3 can be prevented from penetrating through the second surface 512 and entering the pipe wall of the pipeline 1, and in actual manufacturing, the width of the gap between the pipeline 1 and the second surface 512 along the direction perpendicular to the second surface 521 is not less than 0.5mm.
Further, first joint portion 55 has first clamping surface 551, and second joint portion 56 has second clamping surface 561, and when first joint portion 55 and second joint portion 56 centre gripping pipeline 1, first joint portion 55 laminates on the outer wall of pipeline 1 through first clamping surface 551, and second joint portion 56 laminates on the outer wall of pipeline 1 through second clamping surface 561 to first clamping surface 551 and second clamping surface 561 are the curved surface with pipeline 1 outer wall shape assorted. Can increase the area of contact of first joint portion 55 and second joint portion 56 and pipeline 1 outer wall like this, do benefit to the heat-conduction between detection body 51 and the pipeline 1, and then guarantee in the uniformity of detecting the temperature between body 51 and the pipeline 1. In actual manufacturing, the first clamping portion 55 and the second clamping portion 56 can be both good thermal conductors, and both are integrally formed with the detection body 51.
EXAMPLE III
A method for detecting the wall thickness of a pipe, which uses the system for detecting the wall thickness of a pipe described in the first embodiment or the second embodiment, as shown in fig. 3, includes the steps of:
s100, the first ultrasonic probe emits ultrasonic waves towards the bottom surface and the second surface of the groove along the direction perpendicular to the bottom surface of the groove and receives the ultrasonic waves reflected from the bottom surface and the second surface of the groove respectively;
s200, the first ultrasonic probe sends the time of the ultrasonic wave reflected by the bottom surface of the receiving groove and the time of receiving the ultrasonic wave reflected by the second surface to a CPU;
s300, the CPU calculates the transmission sound velocity c of the ultrasonic wave in the detection body according to the time difference delta t1 between the first ultrasonic probe and the first ultrasonic probe, wherein c =2d 1/delta t1, the time difference delta t1 is respectively used for receiving the ultrasonic wave reflected by the bottom surface of the groove and receiving the ultrasonic wave reflected by the second surface, and the set distance d1 between the bottom surface of the groove and the second surface;
s400, the second ultrasonic probe transmits ultrasonic waves to the pipeline along the radial direction of the pipeline and respectively receives the ultrasonic waves reflected from the outer wall and the inner wall of the pipeline;
s500, the second ultrasonic probe sends the time for receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline to a CPU;
s600, the CPU calculates the wall thickness d2 of the pipeline according to the time difference delta t2 of the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline received by the second ultrasonic probe and the transmission sound velocity c of the ultrasonic waves in the detection body, wherein d2= c delta t2/2.
Specifically, in the detection system for the wall thickness of the pipeline, the number of the second ultrasonic probes is at least two, and the positions of any two second ultrasonic probes corresponding to the outer wall of the pipeline are different from each other.
In step S400, at least two second ultrasonic probes emit ultrasonic waves to different positions of the pipeline along the radial direction of the pipeline, and respectively receive ultrasonic waves reflected from the outer wall and the inner wall of the pipeline at the different positions of the pipeline;
in step S500, at least two second ultrasonic probes respectively send the time for receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipe at different positions to the CPU;
in step S600. And the CPU calculates the wall thickness d2 of the pipeline at different positions according to the time difference delta t2 of the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline received by at least the second ultrasonic probe.
Further, when the detection system of the wall thickness of the pipe includes a display electrically connected to the CPU, the CPU sends the calculation result of the transmission sound speed c of the ultrasonic wave in the detection body and the calculation result of the wall thickness d2 of the pipe to the display for display. When the number of the second ultrasonic probes is at least two, the CPU makes the number of the at least two ultrasonic probes and the calculation results of the wall thickness d2 of the pipeline at the corresponding positions into a list and sends the list to the display for display.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A detection system of pipeline wall thickness which characterized in that:
the method comprises the following steps: the device comprises a CPU (2), a first ultrasonic probe (3), a second ultrasonic probe (4) and a sound velocity detection block (5) which is made of the same material as the pipeline (1) and fixed on the pipeline (1), wherein the sound velocity detection block (5) comprises a detection body (51);
the first ultrasonic probe (3) and the second ultrasonic probe (4) are both electrically connected with the CPU (2), the detection body (51) has a first surface (511) and a second surface (512) which are opposite, a recess (513) is provided on the first surface (511), the recess (513) having a bottom surface (514) parallel to the second surface (512), a set distance d1 exists between the bottom surface (514) and the second surface (512), the first ultrasonic probe (3) corresponds to the groove (513), so that the first ultrasonic probe (3) can emit ultrasonic waves toward the bottom surface (514) and the second surface (512) in a direction perpendicular to the bottom surface (514), simultaneously receiving ultrasonic waves reflected by the bottom surface (514) and the second surface (512), and transmits to the CPU (2) a time to receive the ultrasonic waves reflected by the bottom surface (514) and the second surface (512), the CPU (2) calculates the transmission sound velocity c of the ultrasonic wave in the detection body (51) according to the time difference delta t1 of the first ultrasonic probe (3) receiving the ultrasonic wave reflected by the bottom surface (514) and the second surface (512) and the set distance d1 between the bottom surface (514) and the second surface (512);
second ultrasonic transducer (4) correspond the outer wall of pipeline (1), so that second ultrasonic transducer (4) can follow the radial of pipeline (1) to pipeline (1) transmission ultrasonic wave, receive simultaneously the outer wall of pipeline (1) and the ultrasonic wave of inner wall reflection, and will receive the time of the outer wall of pipeline (1) and the ultrasonic wave of inner wall reflection sends to CPU (2), CPU (2) are according to receiving time difference delta t2 and the ultrasonic wave of the outer wall of pipeline (1) and the ultrasonic wave of inner wall reflection are in the transmission sound velocity c calculation in detection body (51) the wall thickness d2 of pipeline (1).
2. The system for detecting the wall thickness of the pipeline according to claim 1, wherein:
the number of the second ultrasonic probes (4) is at least two, and the positions of any two of the second ultrasonic probes (4) corresponding to the outer wall of the pipeline (1) are different from each other.
3. The system for detecting the wall thickness of the pipeline according to claim 1, wherein:
also comprises a display (6);
the display (6) is electrically connected with the CPU (2), the CPU (2) can send the calculated transmission sound velocity c of the ultrasonic wave in the detection body (51) to the display (6) for displaying, and/or the CPU (2) can send the calculated wall thickness d2 of the pipeline (1) to the display (6) for displaying.
4. The system for detecting the wall thickness of a pipeline according to claim 3, wherein:
also comprises a temperature sensor (7);
first ultrasonic transducer (3) gather in real time detect the temperature information of body (51), and with this information send to CPU (2), temperature sensor (7) set up on the outer wall of pipeline (1), and with CPU (2) electricity is connected, temperature sensor (7) gather in real time the temperature information of pipeline (1), and with this information send to CPU (2), CPU (2) will receive detect the temperature information of body (51) with the temperature information of pipeline (1) send to show on display (6).
5. The system for detecting the wall thickness of the pipeline according to claim 1, wherein:
further comprising a memory (8);
the memory (8) is electrically connected with the CPU (2), the CPU (2) can send the calculated transmission sound velocity c of the ultrasonic wave in the detection body (51) to the memory (8) for storage, and/or the CPU (2) can send the calculated wall thickness d2 of the pipeline (1) to the memory (8) for storage.
6. The system for detecting the wall thickness of the pipeline according to any one of claims 1 to 5, wherein:
the sound speed detection block (5) further includes: the fixing plate is characterized by also comprising a fixing plate (52), a connecting plate (53) and a stud (54);
the fixing plate (52) is parallel to the first surface (511), and one end of the fixing plate is fixedly connected to the detection body (51) through the connecting plate (53);
the fixing plate (52) is provided with a screw hole (521) with the axis vertical to the first surface (511) and matched with the stud (54), and the stud (54) is in threaded connection with the screw hole (521) and abutted against the first ultrasonic probe (3) so as to press the first ultrasonic probe (3) in the groove (513) on the first surface (511).
7. The system for detecting the wall thickness of the pipeline according to any one of claims 1 to 5, wherein:
the sound speed detection block (5) further includes: a first engaging portion (55) and a second engaging portion (56);
the first clamping portion (55) and the second clamping portion (56) are fixedly connected to the second surface (512) and are arranged at intervals, so that the pipeline (1) can be clamped through the first clamping portion (55) and the second clamping portion (56);
when the first clamping portion (55) and the second clamping portion (56) clamp the pipeline (1), a gap exists between the pipeline (1) and the second surface (512).
8. The system for detecting the wall thickness of a pipeline according to claim 7, wherein:
the first clamping portion (55) is provided with a first clamping face (551), the second clamping portion (56) is provided with a second clamping face (561), when the first clamping portion (55) and the second clamping portion (56) clamp the pipeline (1), the first clamping portion (55) is attached to the outer wall of the pipeline (1) through the first clamping face (551), the second clamping portion (56) is attached to the outer wall of the pipeline (1) through the second clamping face (561), and the first clamping face (551) and the second clamping face (561) are curved faces matched with the outer wall of the pipeline (1) in shape.
9. A method for detecting the wall thickness of a pipe, using the pipe wall thickness detection system according to any one of claims 1 to 8, wherein:
the method comprises the following steps:
s100, the first ultrasonic probe emits ultrasonic waves towards the bottom surface and the second surface of the groove along the direction perpendicular to the bottom surface of the groove and receives the ultrasonic waves reflected from the bottom surface and the second surface of the groove respectively;
s200, the first ultrasonic probe sends the time of the ultrasonic wave reflected by the bottom surface of the receiving groove and the time of receiving the ultrasonic wave reflected by the second surface to a CPU;
s300, the CPU calculates the transmission sound velocity c of the ultrasonic wave in the detection body according to the time difference delta t1 of the first ultrasonic probe receiving the ultrasonic wave reflected by the bottom surface of the groove and the ultrasonic wave reflected by the second surface respectively and the set distance d1 between the bottom surface of the groove and the second surface, wherein c =2d 1/delta t1;
s400, the second ultrasonic probe transmits ultrasonic waves to the pipeline along the radial direction of the pipeline and respectively receives the ultrasonic waves reflected from the outer wall and the inner wall of the pipeline;
s500, the second ultrasonic probe sends the time for receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline to a CPU;
s600, the CPU calculates the wall thickness d2 of the pipeline according to the time difference delta t2 of the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline received by the second ultrasonic probe and the transmission sound velocity c of the ultrasonic waves in the detection body, wherein d2= c delta t2/2.
10. The method for detecting the wall thickness of the pipeline according to claim 9, wherein:
in the detection system for the wall thickness of the pipeline, the number of the second ultrasonic probes is at least two, and the positions of any two second ultrasonic probes corresponding to the outer wall of the pipeline are different from each other.
In step S400, at least two second ultrasonic probes emit ultrasonic waves to different positions of the pipeline along a radial direction of the pipeline, and respectively receive ultrasonic waves reflected from outer walls of the different positions of the pipeline and inner walls of the pipeline;
in step S500, at least two second ultrasonic probes respectively send the time for receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipe at different positions to the CPU;
in step S600. And the CPU calculates the wall thickness d2 of the pipeline at different positions according to the time difference delta t2 of the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline received by at least the second ultrasonic probe.
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