A pipeline wall thickness detection system and detection method

Abstract

The present invention provides a pipeline wall thickness detection system and detection method. A pipeline wall thickness detection system includes: a CPU, a first ultrasonic probe, a second ultrasonic probe and a sound velocity detection block made of the same material as the pipeline and fixed on the pipeline, wherein the sound velocity detection block includes a detection body. The first ultrasonic probe and the second ultrasonic probe are both electrically connected to the CPU. The detection body has a first surface and a second surface opposite to each other. A groove is arranged on the first surface. The groove has a bottom surface parallel to the second surface. There is a set distance d1 between the bottom surface and the second surface. The first ultrasonic probe corresponds to the groove, and the second ultrasonic probe corresponds to the outer wall of the pipeline. The present invention has the advantage of being able to monitor the sound velocity of the ultrasonic wave in real time during the process of detecting the pipeline wall thickness, thereby making the pipeline wall thickness detection result more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of acoustic emission detection, and in particular to a pipeline wall thickness detection system and a detection method. Background Art

[0002] After long-term operation, pipelines will age, deform or corrode, making the wall thickness index of the pipeline no longer meet safety requirements, leading to oil and gas pipeline accidents and even huge economic losses. Therefore, distributed full-pipeline real-time remote monitoring of the wall thickness of key weak points of the entire pipeline (pipeline network) provides technical support for pipeline networking, intelligent health monitoring and early warning, and ensures the safety of oil and gas pipeline transportation.

[0003] Ultrasonic pulse reflection method for wall thickness detection is a conventional means of achieving regular detection of pipeline wall thickness. It is widely used in the field of thickness measurement due to its advantages of high measurement accuracy, convenient installation and use, low price, safety and reliability. However, in actual applications, a portable ultrasonic thickness gauge with a single straight probe is used to perform regular single-point measurement of pipeline wall thickness, and the sound velocity is manually input or selected by the interface, which is different from real-time online monitoring and is greatly affected by ambient temperature, resulting in low measurement accuracy. In particular, when performing distributed full-pipeline real-time detection of wall thickness changes of in-service pipelines, the size, material, and temperature of the on-site pipelines change with time, location, and oil products. These factors will directly affect the ultrasonic propagation velocity, thereby reducing the wall thickness measurement accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a pipeline wall thickness detection system and detection method, which can monitor the sound velocity of ultrasonic waves in real time during the pipeline wall thickness detection process, thereby making the pipeline wall thickness detection result more accurate.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A pipeline wall thickness detection system, comprising: a CPU, a first ultrasonic probe, a second ultrasonic probe and a sound velocity detection block made of the same material as the pipeline and fixed on the pipeline, wherein the sound velocity detection block comprises a detection body;

[0007] The first ultrasonic probe and the second ultrasonic probe are both electrically connected to the CPU, the detection body has a first surface and a second surface opposite to each other, a groove is arranged on the first surface, the groove has a bottom surface parallel to the second surface, there is a set distance d1 between the bottom surface and the second surface, the first ultrasonic probe corresponds to the groove, so that the first ultrasonic probe can emit ultrasonic waves toward the bottom surface and the second surface in a direction perpendicular to the bottom surface, and simultaneously receive ultrasonic waves reflected by the bottom surface and the second surface, and send the time of receiving the ultrasonic waves reflected by the bottom surface and the second surface to the CPU, the CPU calculates the transmission sound speed c of the ultrasonic wave in the detection body according to the time difference Δt1 when the first ultrasonic probe receives 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;

[0008] The second ultrasonic probe corresponds to the outer wall of the pipe, so that the second ultrasonic probe can transmit ultrasonic waves to the pipe along the radial direction of the pipe, and simultaneously receive ultrasonic waves reflected by the outer wall and inner wall of the pipe, and send the time of receiving the ultrasonic waves reflected by the outer wall and inner wall of the pipe to the CPU. The CPU calculates the wall thickness d2 of the pipe based on the time difference Δt2 of receiving the ultrasonic waves reflected by the outer wall and inner wall of the pipe and the transmission sound speed c of the ultrasonic wave in the detection body.

[0009] 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 pipe are different.

[0010] Preferably, it also includes a display;

[0011] The display is electrically connected to the CPU, and the CPU can send the calculated transmission sound velocity c of the ultrasonic wave in the detection body to the display for display, and / or the CPU can send the calculated wall thickness d2 of the pipe to the display for display.

[0012] Preferably, it also includes a temperature sensor;

[0013] 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 to the CPU. The temperature sensor collects temperature information of the pipeline in real time and sends the information to the CPU. The CPU sends the received temperature information of the detection body and the temperature information of the pipeline to the display for display.

[0014] Preferably, it also includes a memory;

[0015] The memory is electrically connected to the CPU, and the CPU can send the calculated transmission sound speed 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 pipe to the memory for storage.

[0016] Preferably, the sound velocity detection block further comprises: a fixing plate, a connecting plate and a stud;

[0017] 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;

[0018] The fixing plate is provided with a screw hole whose axis is perpendicular to the first surface and matches the stud. The stud is threadedly connected in the screw hole and abuts against the first ultrasonic probe to press the first ultrasonic probe into the groove on the first surface.

[0019] Preferably, the sound velocity detection block further comprises: a first clamping portion and a second clamping portion;

[0020] The first clamping portion and the second clamping portion are both fixedly connected to the second surface and arranged at intervals from each other, so that the first clamping portion and the second clamping portion can clamp the pipe;

[0021] When the first clamping portion and the second clamping portion clamp the pipe, a gap exists between the pipe and the second surface.

[0022] Preferably, the first clamping portion has a first clamping surface, and the second clamping portion has a second clamping surface. When the first clamping portion and the second clamping portion clamp the pipe, the first clamping portion is attached to the outer wall of the pipe through the first clamping surface, and the second clamping portion is attached to the outer wall of the pipe through the second clamping surface, and the first clamping surface and the second clamping surface are both curved surfaces that match the shape of the outer wall of the pipe.

[0023] A method for detecting pipe wall thickness, using a pipe wall thickness detection system having any of the above technical features, comprising the steps of:

[0024] S100, the first ultrasonic probe transmits ultrasonic waves toward the bottom surface and the second surface of the groove in a direction perpendicular to the bottom surface of the groove, and receives ultrasonic waves reflected from the bottom surface and the second surface of the groove respectively;

[0025] S200, the first ultrasonic probe sends the time of receiving the ultrasonic wave reflected by the bottom surface of the groove and the time of receiving the ultrasonic wave reflected by the second surface to the CPU;

[0026] S300, the CPU calculates the transmission speed c of the ultrasonic wave in the detection body according to the time difference Δt1 between 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, and the set distance d1 between the bottom surface of the groove and the second surface, where c=2d1 / Δt1;

[0027] S400, the second ultrasonic probe transmits ultrasonic waves to the pipeline along the radial direction of the pipeline, and receives ultrasonic waves reflected from the outer wall and the inner wall of the pipeline respectively;

[0028] S500, the second ultrasonic probe sends the time when the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline are received to the CPU;

[0029] S600, the CPU calculates the wall thickness d2 of the pipe according to the time difference Δt2 when the second ultrasonic probe receives the ultrasonic waves reflected by the outer wall and the inner wall of the pipe, and the transmission speed c of the ultrasonic waves in the detection body, where d2=cΔt2 / 2.

[0030] Preferably, in the pipeline wall thickness detection system, 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 pipeline outer wall are different.

[0031] In step S400, at least two second ultrasonic probes transmit 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 different positions;

[0032] In step S500, at least two second ultrasonic probes respectively send the time of receiving ultrasonic waves reflected from the outer wall and the inner wall at different positions of the pipeline to the CPU;

[0033] In step S600, the CPU calculates the wall thickness d2 of the pipeline at different positions according to the time difference Δt2 when at least the second ultrasonic probe receives the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline.

[0034] The pipeline wall thickness detection system and detection method of the present invention adopts the CPU to calculate the transmission sound speed c of the ultrasonic wave in the detection body according to the time difference Δt1 when the first ultrasonic probe receives 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 Δt2 when the ultrasonic wave reflected by the outer wall and the inner wall of the pipeline is received and the transmission sound speed c of the ultrasonic wave in the detection body. In the process of detecting the pipeline wall thickness, the sound speed of the ultrasonic wave can be monitored in real time, thereby making the pipeline wall thickness detection result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of an embodiment of a pipeline wall thickness detection system of the present invention;

[0036] Figure 2 for Figure 1 Schematic diagram of the A-A section;

[0037] Figure 3 The present invention is a flow chart of the method for detecting pipe wall thickness.

[0038] Among them: 1-pipeline; 2-CPU; 3-first ultrasonic probe; 4-second ultrasonic probe; 5-sound speed detection device; 51-detection body; 511-first surface; 512-second surface; 513-groove; 514-bottom surface; 52-fixing plate; 521-screw hole; 53-connecting plate; 54-stud; 55-first clamping part; 551-first clamping surface; 56-second clamping part; 561-second clamping surface; 6-display; 7-temperature monitor; 8-memory. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the pipe wall thickness detection system and detection method of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] To facilitate understanding, we first briefly introduce the principle of ultrasonic measurement of pipelines. Ultrasonic measurement of pipeline wall thickness is mainly based on the principle that when ultrasonic waves propagate between different media, they will be reflected on the surface of one medium to another. The ultrasonic transducer emits ultrasonic waves of a certain frequency, which will propagate forward in the medium. In the same medium, the propagation speed of ultrasonic waves is basically the same, but when ultrasonic waves pass through the junction of different propagation media, ultrasonic reflection and transmission will occur, and the reflected ultrasonic waves will be received by the transducer. By accurately measuring the flight time of ultrasonic waves in the object being measured, the thickness of the propagation medium can be indirectly obtained.

[0041] Embodiment 1

[0042] like Figure 1 , 2 As shown, a pipeline wall thickness detection system includes: a CPU 2, a first ultrasonic probe 3, a second ultrasonic probe 4, and a sound velocity detection block 5 made of the same material as the pipeline 1 and fixed on the pipeline 1, and the sound velocity detection block 5 includes a detection body 51;

[0043] The first ultrasonic probe 3 and the second ultrasonic probe 4 are both electrically connected to the CPU 2. The detection body 51 has a first surface 511 and a second surface 512 facing 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. There is a set distance d1 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, and at the same time receive ultrasonic waves reflected by the bottom surface 514 and the second surface 512. The second ultrasonic probe 4 corresponds to the outer wall of the pipeline 1, so that the second ultrasonic probe 4 can emit ultrasonic waves to the pipeline 1 along the radial direction of the pipeline 1, and at the same time receive 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 ≥20000 Hz. The detection frequency of a general pipeline is approximately 2 MHz to 7.5 MHz. The center frequency of the ultrasonic wave used in the design can be 5 MHz.

[0044] When working, the first ultrasonic probe 3 sends the time of receiving the ultrasonic wave reflected by the bottom surface 514 and the second surface 512 to the CPU2. The CPU2 calculates the transmission speed c of the ultrasonic wave in the detection body 51 according to the time difference Δt1 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. The specific calculation formula is c=2d1 / Δt1. The second ultrasonic probe 4 sends the time of receiving the ultrasonic wave reflected by the outer wall and the inner wall of the pipeline 1 to the CPU2. The CPU2 calculates the wall thickness d2 of the pipeline 1 according to the time difference Δt2 of the ultrasonic wave reflected by the outer wall and the inner wall of the pipeline 1 and the transmission speed c of the ultrasonic wave in the detection body 51 (because the detection body 51 and the pipeline 1 are made of the same material, it can be considered that the transmission speed of the ultrasonic wave in the pipeline 1 is also c). The specific calculation formula is d2=cΔt2 / 2.

[0045] In this way, the speed of ultrasound can be monitored in real time during the detection of pipe wall thickness, thereby making the pipe wall thickness detection result more accurate.

[0046] Specifically, Figure 1 As shown in , the number of the second ultrasonic probes 4 is at least two, for example, 15. The positions of any two second ultrasonic probes 4 corresponding to the outer wall of the pipe 1 are different from each other. At this time, the CPU 2 can simultaneously calculate the wall thickness d2 of the pipe 1 at the positions corresponding to the multiple second ultrasonic probes 4, thereby improving the efficiency of the detection work.

[0047] Furthermore, if Figure 1As shown, the apparatus further includes a display 6, which is electrically connected to 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 display, and / or the CPU 2 can send the calculated wall thickness d2 of the pipe 1 to the display 6 for display. In this way, the operator can directly obtain the detection result by watching the display 6. It should be noted that when the number of the second ultrasonic probes 4 is at least two, the CPU 2 can simultaneously send the calculation results of the wall thickness d2 of the pipe 1 at the positions corresponding to the multiple second ultrasonic probes 4 to the display 6 for display.

[0048] As an implementation method, Figure 1 As shown, a temperature sensor 7 is also included;

[0049] The first ultrasonic probe 3 collects the temperature information of the detection body 51 in real time and sends the information to the CPU 2. The temperature sensor 7 is arranged on the outer wall of the pipeline 1 and is electrically connected to the CPU 2. The temperature sensor 7 collects the temperature information of the pipeline 1 in real time and sends the information to the CPU 2. The CPU 2 sends the received temperature information of the pipeline 1 to the display 6 for display. In this way, during the process of measuring the wall thickness of the pipeline 1, the operator can observe in real time whether the temperature of the detection body 51 is consistent with the temperature of the pipeline 1. If there is inconsistency, it is necessary to check whether the first ultrasonic probe 3 is faulty or whether the installation position of the sound velocity detection block 5 is correct, etc., to ensure that the temperature of the detection body 51 is consistent with the temperature of the pipeline 1, so as to ensure the accuracy of the measurement result.

[0050] As an implementation method, a memory 8 is further included. The memory 8 is electrically connected to the CPU 2, and the CPU 2 can send the calculated transmission speed 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, for future query and comparison.

[0051] Embodiment 2

[0052] Based on the first embodiment, Figure 2As shown, the sound velocity detection block 5 also includes: 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 is fixedly connected to the detection body 51 through the connecting plate 53. A screw hole 521 whose axis is perpendicular to the first surface 511 and matches the stud 54 is provided on the fixing plate 52. The stud 54 is threadedly connected in the screw hole 521 and abuts against the first ultrasonic probe 3 to press the first ultrasonic probe 3 into the groove 513 on the first surface 511. In this way, a stable corresponding relationship can be maintained between the first ultrasonic probe 3 and the groove 513, thereby ensuring the accuracy of the measurement result. In actual production, the fixing plate 52, the connecting plate 53 and the detection body 51 can be integrally formed, but it is not limited thereto, and any other technical solution that can achieve the purpose of the invention can also be adopted.

[0053] As an implementable embodiment, the sound velocity detection block 5 also includes: a first clamping portion 55 and a second clamping portion 56. The first clamping portion 55 and the second clamping portion 56 are both fixedly connected to the second surface 512 and arranged at intervals from each other, so that the first clamping portion 55 and the second clamping portion 56 can clamp the pipe 1. When the first clamping portion 55 and the second clamping portion 56 clamp the pipe 1, there is a gap between the pipe 1 and the second surface 512. In this way, the sound velocity detection block 5 can be stably installed on the pipe 1. The gap between the pipe 1 and the second surface 512 can prevent the ultrasonic wave emitted by the first ultrasonic probe 3 from penetrating the second surface 512 and entering the pipe wall of the pipe 1. In actual production, the width of the gap between the pipe 1 and the second surface 512 in a direction perpendicular to the second surface 521 is not less than 0.5 mm.

[0054] Furthermore, the first clamping portion 55 has a first clamping surface 551, and the second clamping portion 56 has a second clamping surface 561. When the first clamping portion 55 and the second clamping portion 56 clamp the pipe 1, the first clamping portion 55 is attached to the outer wall of the pipe 1 through the first clamping surface 551, and the second clamping portion 56 is attached to the outer wall of the pipe 1 through the second clamping surface 561, and the first clamping surface 551 and the second clamping surface 561 are both curved surfaces that match the shape of the outer wall of the pipe 1. In this way, the contact area between the first clamping portion 55 and the second clamping portion 56 and the outer wall of the pipe 1 can be increased, which is beneficial to the heat conduction between the detection body 51 and the pipe 1, and further ensures the consistency of the temperature between the detection body 51 and the pipe 1. In actual production, the materials of the first clamping portion 55 and the second clamping portion 56 can both be good thermal conductors, and both are integrally formed with the detection body 51.

[0055] Embodiment 3

[0056] A method for detecting pipe wall thickness, using the pipe wall thickness detection system described in the first or second embodiment, such as Figure 3 As shown, the steps include:

[0057] S100, the first ultrasonic probe transmits ultrasonic waves toward the bottom surface and the second surface of the groove in a direction perpendicular to the bottom surface of the groove, and receives ultrasonic waves reflected from the bottom surface and the second surface of the groove respectively;

[0058] S200, the first ultrasonic probe sends the time of receiving the ultrasonic wave reflected by the bottom surface of the groove and the time of receiving the ultrasonic wave reflected by the second surface to the CPU;

[0059] S300, the CPU calculates the transmission speed c of the ultrasonic wave in the detection body according to the time difference Δt1 between 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, and the set distance d1 between the bottom surface of the groove and the second surface, where c=2d1 / Δt1;

[0060] S400, the second ultrasonic probe transmits ultrasonic waves to the pipeline along the radial direction of the pipeline, and receives ultrasonic waves reflected from the outer wall and the inner wall of the pipeline respectively;

[0061] S500, the second ultrasonic probe sends the time when the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline are received to the CPU;

[0062] S600, the CPU calculates the wall thickness d2 of the pipe according to the time difference Δt2 when the second ultrasonic probe receives the ultrasonic waves reflected by the outer wall and the inner wall of the pipe, and the transmission speed c of the ultrasonic waves in the detection body, where d2=cΔt2 / 2.

[0063] Specifically, in the pipeline wall thickness detection system, 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 pipeline outer wall are different.

[0064] In step S400, at least two second ultrasonic probes transmit 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 different positions;

[0065] In step S500, at least two second ultrasonic probes respectively send the time of receiving ultrasonic waves reflected from the outer wall and the inner wall at different positions of the pipeline to the CPU;

[0066] In step S600, the CPU calculates the wall thickness d2 of the pipeline at different positions according to the time difference Δt2 when at least the second ultrasonic probe receives the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline.

[0067] Further, when the pipeline wall thickness detection system includes a display electrically connected to the CPU, the CPU sends the calculation result of the transmission sound velocity c of the ultrasonic wave in the detection body and the calculation result of the wall thickness d2 of the pipeline to the display for display. When the number of the second ultrasonic probes is at least two, the CPU prepares a list of the numbers of the at least two ultrasonic probes and the calculation results of the wall thickness d2 of the pipeline at the positions corresponding to the two ultrasonic probes and sends it to the display for display.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pipeline wall thickness detection system, characterized in that: include: A CPU (2), a first ultrasonic probe (3), a second ultrasonic probe (4), and a sound velocity detection block (5) 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 to the CPU (2); the detection body (51) has a first surface (511) and a second surface (512) facing 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); the first ultrasonic probe (3) corresponds to the groove (513) so that the first ultrasonic probe (3) can move in a direction perpendicular to the bottom surface (514) Transmitting ultrasonic waves toward the bottom surface (514) and the second surface (512), receiving ultrasonic waves reflected by the bottom surface (514) and the second surface (512), and sending the time of receiving the ultrasonic waves reflected by the bottom surface (514) and the second surface (512) to the CPU (2), wherein the CPU (2) calculates the transmission speed c of the ultrasonic waves in the detection body (51) according to the time difference Δt1 between the first ultrasonic probe (3) 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); The second ultrasonic probe (4) corresponds to the outer wall of the pipeline (1), so that the second ultrasonic probe (4) can transmit ultrasonic waves to the pipeline (1) along the radial direction of the pipeline (1), and simultaneously receive ultrasonic waves reflected by the outer wall and the inner wall of the pipeline (1), and send the time of receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline (1) to the CPU (2), and the CPU (2) calculates the wall thickness d2 of the pipeline (1) according to the time difference Δt2 of receiving the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline (1) and the transmission sound speed c of the ultrasonic waves in the detection body (51); Also includes a display (6) and a temperature sensor (7); The first ultrasonic probe (3) collects temperature information of the detection body (51) in real time and sends the information to the CPU (2); the temperature sensor (7) is arranged on the outer wall of the pipeline (1) and is electrically connected to the CPU (2); the temperature sensor (7) collects temperature information of the pipeline (1) in real time and sends the information to the CPU (2); the CPU (2) sends the received temperature information of the detection body (51) and the temperature information of the pipeline (1) to the display (6) for display; The sound velocity detection block (5) further comprises: a first clamping portion (55) and a second clamping portion (56); The first clamping portion (55) and the second clamping portion (56) are both fixedly connected to the second surface (512) and arranged at intervals from each other, so that the first clamping portion (55) and the second clamping portion (56) can clamp the pipe (1); When the first clamping portion (55) and the second clamping portion (56) clamp the pipe (1), a gap exists between the pipe (1) and the second surface (512).

2. The pipeline wall thickness detection system according to claim 1, characterized in that: 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 pipe (1) are different from each other.

3. The pipeline wall thickness detection system according to claim 1, characterized in that: The display (6) is electrically connected to the CPU (2), and the CPU (2) is capable of sending the calculated transmission speed c of the ultrasonic wave in the detection body (51) to the display (6) for display, and / or the CPU (2) is capable of sending the calculated wall thickness d2 of the pipeline (1) to the display (6) for display.

4. The pipeline wall thickness detection system according to claim 1, characterized in that: Also includes a memory (8); The memory (8) is electrically connected to the CPU (2), and the CPU (2) is capable of sending the calculated transmission speed c of the ultrasonic wave in the detection body (51) to the memory (8) for storage, and / or the CPU (2) is capable of sending the calculated wall thickness d2 of the pipeline (1) to the memory (8) for storage.

5. The pipeline wall thickness detection system according to any one of claims 1 to 4, characterized in that: The sound velocity detection block (5) further comprises: 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 (52) is fixedly connected to the detection body (51) via the connecting plate (53); The fixing plate (52) is provided with a screw hole (521) whose axis is perpendicular to the first surface (511) and matches the screw bolt (54); the screw bolt (54) is threadedly connected in the screw hole (521) and abuts against the first ultrasonic probe (3) to press the first ultrasonic probe (3) into the groove (513) on the first surface (511).

6. The pipeline wall thickness detection system according to claim 5, characterized in that: The first clamping portion (55) has a first clamping surface (551), and the second clamping portion (56) has a second clamping surface (561). When the first clamping portion (55) and the second clamping portion (56) clamp the pipe (1), the first clamping portion (55) is attached to the outer wall of the pipe (1) through the first clamping surface (551), and the second clamping portion (56) is attached to the outer wall of the pipe (1) through the second clamping surface (561), and the first clamping surface (551) and the second clamping surface (561) are both curved surfaces that match the shape of the outer wall of the pipe (1).

7. A method for detecting pipe wall thickness, using the pipe wall thickness detection system according to any one of claims 1 to 6, characterized in that: Includes steps: S100, the first ultrasonic probe transmits ultrasonic waves toward the bottom surface and the second surface of the groove in a direction perpendicular to the bottom surface of the groove, and receives ultrasonic waves reflected from the bottom surface and the second surface of the groove respectively; S200, the first ultrasonic probe sends the time of receiving the ultrasonic wave reflected by the bottom surface of the groove and the time of receiving the ultrasonic wave reflected by the second surface to the CPU; S300, the CPU calculates the transmission speed c of the ultrasonic wave in the detection body according to the time difference Δt1 between 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, and the set distance d1 between the bottom surface of the groove and the second surface, where c=2d1 / Δt1; S400, the second ultrasonic probe transmits ultrasonic waves to the pipeline along the radial direction of the pipeline, and receives ultrasonic waves reflected from the outer wall and the inner wall of the pipeline respectively; S500, the second ultrasonic probe sends the time when the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline are received to the CPU; S600, the CPU calculates the wall thickness d2 of the pipe according to the time difference Δt2 when the second ultrasonic probe receives the ultrasonic waves reflected by the outer wall and the inner wall of the pipe, and the transmission speed c of the ultrasonic waves in the detection body, where d2=cΔt2 / 2.

8. The method for detecting pipe wall thickness according to claim 7, characterized in that: In the pipeline wall thickness detection system, the number of second ultrasonic probes is at least two, and the positions of any two of the second ultrasonic probes corresponding to the pipeline outer wall are different from each other; In step S400, at least two second ultrasonic probes transmit 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 different positions; In step S500, at least two second ultrasonic probes respectively send the time of receiving ultrasonic waves reflected from the outer wall and the inner wall at different positions of the pipeline to the CPU; In step S600, the CPU calculates the wall thickness d2 of the pipeline at different positions according to the time difference Δt2 when at least the second ultrasonic probe receives the ultrasonic waves reflected by the outer wall and the inner wall of the pipeline.

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