Leakage detection device for natural gas hydrogen-doped pipeline

Abstract

The invention relates to the technical field of fuel gas conveying safety detection, and discloses a leakage detection device for a natural gas hydrogen-doped pipeline, and the device comprises a vehicle body, the top of the vehicle body is fixedly connected with a supporting block, the interior of the supporting block is slidably connected with a telescopic block, and the top side of the telescopic block is provided with an angle adjusting assembly. An auxiliary assembly is arranged on the side, away from the telescopic block, of the angle adjusting assembly, ultrasonic detection heads are evenly installed on the side, away from the angle adjusting assembly, of the auxiliary assembly, wheels are installed at the four corners of the bottom of the vehicle body, and a processing assembly is arranged on the side, away from the wheels, of the vehicle body. A vehicle lamp is installed at one end of the vehicle body, and a vehicle-mounted power source is installed at the other end of the vehicle body. Through cooperation of structures such as a hydraulic rod, a telescopic block, a supporting block and a through groove, flexible and stable adjustment of the height of a detection part of the detection device is realized, and rapid adaptation to pipelines with different heights is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of gas transmission safety detection, and specifically to a leakage detection device for a natural gas hydrogen-blended pipeline. Background Art

[0002] The leakage detection devices for natural gas hydrogen-blended pipelines are a general term for equipment specifically used to detect whether there is gas leakage in natural gas hydrogen-blended pipelines. With the help of various advanced technologies, by precisely detecting the gas components and concentration changes in the surrounding environment of the pipeline, it is possible to determine whether the pipeline leaks and the degree of leakage. Among many such devices, the detection vehicle is an efficient and flexible detection equipment. It integrates a variety of detection instruments on the vehicle and, relying on the mobility of the vehicle, can quickly move along the natural gas hydrogen-blended pipeline for detection.

[0003] The basic structure of the leakage detection vehicle for natural gas hydrogen-blended pipelines includes a vehicle body, detection probes, signal transmission lines, and a data analysis and processing unit, etc. The detection probes use technologies such as lasers and spectroscopy to detect the gas in the surrounding environment of the pipeline. When there is a leakage of natural gas hydrogen blend, the laser remote sensing type probes use the interaction between the laser and the leakage gas molecules to cause a change in the laser intensity for detection; the spectroscopy analysis type judges by identifying the absorption spectrum characteristics of the gas for light of a specific wavelength. The detected signals are transmitted to the data analysis and processing unit through the transmission lines, and the signals are analyzed, compared, and calculated to determine whether there is leakage and key information such as the leakage location and concentration, ensuring the safe operation of the pipeline.

[0004] Although the existing leakage detection vehicles for natural gas hydrogen-blended pipelines can move in the surrounding area of the pipeline to complete the detection task, there are still deficiencies in the structural design. First of all, since the pipeline usually shows different heights and angles during the laying process due to terrain changes or installation requirements, the detection vehicle needs to continuously adapt to different detection positions during the driving process. Most of the detection parts of the existing detection vehicles adopt rigid structures, and the adjustment methods rely on manual or simple mechanical mechanisms, lacking flexibility. As a result, when facing complex working conditions, it is difficult to quickly and accurately adjust the position of the detection probes. This lack of height and angle adjustment ability seriously affects the detection efficiency and detection accuracy. Secondly, the detection vehicle does not effectively protect against the problem of charge accumulation in its structure. Especially in a dry environment or during high-speed movement, static electricity is likely to accumulate on the vehicle body and detection components. Once the static electricity is released, it is easy to cause sparks, and hydrogen, as a highly flammable gas, increases the safety hazards during the detection process. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a leakage detection device for a natural gas hydrogen-blended pipeline, which solves the problems that it is difficult to quickly and accurately adjust the height and angle of the detection part, and that static electricity is likely to accumulate on the vehicle body and detection components, leading to safety hazards.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A leakage detection device for a natural gas hydrogen-blended pipeline, comprising a vehicle body, a support block is fixedly connected to the top of the vehicle body, a telescopic block is slidably connected inside the support block, an angle adjustment component is arranged on the top side of the telescopic block, an auxiliary component is arranged on the side of the angle adjustment component away from the telescopic block, ultrasonic detection heads are evenly installed on the side of the auxiliary component away from the angle adjustment component, wheels are installed at the four corners of the bottom of the vehicle body, a processing component is arranged on the side of the vehicle body away from the wheels, a vehicle lamp is installed at one end of the vehicle body, a vehicle-mounted power supply is installed at the other end of the vehicle body, an electrostatic removal component is arranged on the side of the vehicle body away from the support block, a hydraulic rod is installed inside the support block, the telescopic block is connected to the support block through the output end of the hydraulic rod, sliders are symmetrically and fixedly connected to both ends of the telescopic block, and a telescopic rod is installed between the support block and the telescopic block.

[0007] Preferably, the angle adjustment component includes a mounting shell, the mounting shell is installed on the top side of the telescopic block, a micro motor one and a micro motor two are installed inside the mounting shell, the output ends of the micro motor one and the micro motor two are respectively fixedly connected with a worm and a rotating frame, a rotating shaft is rotatably connected inside the rotating frame, a worm gear is fixedly connected to the outer side of the rotating shaft, and connecting rods are fixedly connected to both ends of the rotating shaft.

[0008] Preferably, the electrostatic removal component includes a current collector, the current collector is installed in the middle of the vehicle body, and a grounding wire is fixedly connected to the end of the current collector away from the vehicle body.

[0009] Preferably, the processing component includes a housing, the housing is fixedly connected to the top of the vehicle body, a processor is installed inside the housing, a transmission line is fixedly connected to the top of the housing, a display screen and operation buttons are installed on the side of the housing away from the support block, an alarm is installed on the top of the vehicle body, and the display screen is arranged on the left side of the operation buttons.

[0010] Preferably, the auxiliary component includes a mounting plate, the mounting plate is fixedly connected to the end of the connecting rod away from the telescopic block, a fixing block is fixedly connected to the side of the mounting plate close to the ultrasonic detection head, a roller is rotatably connected inside the fixing block, and the ultrasonic detection head is installed on the side of the mounting plate close to the roller.

[0011] Preferably, a through groove is arranged inside the support block, and the telescopic block is slidably connected to the middle of the through groove.

[0012] Preferably, a sliding groove is opened on the inner side of the support block, and the slider is slidably connected to the middle of the sliding groove.

[0013] Preferably, the ultrasonic detection head is connected to the telescopic block through the connecting rod, and the worm is meshed with the worm gear.

[0014] Preferably, a movable groove is formed on one side of the mounting shell close to the ultrasonic detection head, and the connecting rod is arranged in the middle of the movable groove.

[0015] Preferably, the processor is electrically connected to the ultrasonic detection head, the display screen, the operation button and the alarm through the transmission line.

[0016] The present invention provides a leakage detection device for a natural gas hydrogen blending pipeline. It has the following beneficial effects:

[0017] 1. In the present invention, the output end of the hydraulic rod pushes the telescopic block to slide in the through groove of the support block, the telescopic rod assists in stable support, and the slider slides in the inner chute of the support block to ensure stability, realizing flexible and stable adjustment of the height of the detection part of the detection device, which helps to quickly adapt to pipelines of different heights and effectively improves the detection efficiency.

[0018] 2. In the present invention, the first micro motor drives the worm to rotate, the worm is meshed with the worm gear to make the rotating shaft rotate, and then drives the connecting rod and the connected ultrasonic detection head to initially adjust the angle in the Y-axis direction; the second micro motor drives the rotating frame to rotate, and the rotating frame drives the connecting rod to further finely adjust the angle of the ultrasonic detection head in the X-axis direction, realizing rapid and high-precision adjustment of the detection angle, and further improving the detection accuracy of the detection device.

[0019] 3. In the present invention, the static electricity generated by the vehicle body and the detection component is collected by the static electricity collector, and then the static electricity is introduced into the ground through the ground wire, effectively preventing the static electricity from accumulating and causing sparks during the drying environment or high-speed movement process, avoiding serious accidents caused by static electricity release in the hydrogen leakage environment, and improving the safety of the detection device.

[0020] 4. In the present invention, the rollers contact the surface of the pipeline, and assist the detection part to move along the pipeline when the detection device moves. This not only reduces the friction between the detection part and the pipeline, protects the detection device, but also ensures the coherence and stability of the detection process, and further improves the detection efficiency of the detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view of the present invention;

[0022] Figure 2 is a schematic diagram of the static electricity removing component of the present invention;

[0023] Figure 3 is a schematic diagram of the hydraulic rod of the present invention;

[0024] Figure 4 is a schematic diagram of the through groove of the present invention;

[0025] Figure 5 Schematic diagram of the connecting rod of the present invention;

[0026] Figure 6 Schematic diagram of the angle adjustment component of the present invention;

[0027] Figure 7 Schematic diagram of the condenser of the present invention;

[0028] Figure 8 Schematic diagram of the processing component of the present invention.

[0029] Wherein, 1, vehicle body; 2, support block; 3, telescopic block; 4, ultrasonic detection head; 5, angle adjustment component; 51, mounting shell; 52, micro motor 1; 53, micro motor 2; 54, worm; 55, rotating frame; 56, worm gear; 57, rotating shaft; 58, connecting rod; 59, movable groove; 6, static elimination component; 61, condenser; 62, ground wire; 7, processing component; 71, housing; 72, processor; 73, transmission line; 74, display screen; 75, operation button; 76, alarm; 8, auxiliary component; 81, mounting plate; 82, fixing block; 83, roller; 9, hydraulic rod; 10, telescopic rod; 11, slider; 12, chute; 13, wheel; 14, vehicle lamp; 15, vehicle-mounted power supply; 16, through groove. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to the attached Figure 1 - attached Figure 4, an embodiment of the present invention provides a leakage detection device for a natural gas hydrogen - blended pipeline, which includes a vehicle body 1. A support block 2 is fixedly connected to the top of the vehicle body 1. A telescopic block 3 is slidably connected inside the support block 2. An angle - adjusting assembly 5 is arranged on the top side of the telescopic block 3. An auxiliary assembly 8 is arranged on the side of the angle - adjusting assembly 5 away from the telescopic block 3. Ultrasonic detection heads 4 are evenly installed on the side of the auxiliary assembly 8 away from the angle - adjusting assembly 5. Wheels 13 are installed at the four corners of the bottom of the vehicle body 1. A processing assembly 7 is arranged on the side of the vehicle body 1 away from the wheels 13. A vehicle lamp 14 is installed at one end of the vehicle body 1. A vehicle - mounted power supply 15 is installed at the other end of the vehicle body 1. An electrostatic - removing assembly 6 is arranged on the side of the vehicle body 1 away from the support block 2. A hydraulic rod 9 is installed inside the support block 2. The telescopic block 3 is connected to the support block 2 through the output end of the hydraulic rod 9. Sliders 11 are symmetrically and fixedly connected to both ends of the telescopic block 3. A telescopic rod 10 is installed between the support block 2 and the telescopic block 3. A through - groove 16 is arranged inside the support block 2. The telescopic block 3 is slidably connected to the middle of the through - groove 16. A chute 12 is formed on the inner side of the support block 2. The slider 11 is slidably connected to the middle of the chute 12.

[0032] Specifically, by starting the hydraulic rod 9, a thrust is generated at the output end of the hydraulic rod 9, pushing the telescopic block 3 to slide smoothly within the preset through - groove 16 of the support block 2. During this process, the telescopic rod 10 adaptively adjusts its own length according to the telescopic amplitude of the hydraulic rod 9, providing an auxiliary supporting force to the telescopic block 3 from the side, ensuring the stability of the center of gravity of the detection part during height adjustment, and avoiding shaking caused by unilateral force or center - of - gravity deviation. At the same time, the sliders 11 at both ends of the telescopic block 3 slide along the chutes 12 designed on the inner side of the support block 2. The chutes 12 and the sliders 11 are closely matched, while limiting the movement trajectory of the telescopic block 3, further enhancing the smoothness of the telescopic process. This collaborative working method can quickly and stably adjust the height of the detection part, enabling the detection device to quickly adapt to natural gas hydrogen - blended pipelines of different heights. Compared with traditional detection vehicles that require manual adjustment or the use of simple mechanical mechanisms, it improves the detection efficiency, reduces the detection preparation time, and provides guarantee for the detection device to carry out pipeline leakage detection work in a timely and efficient manner.

[0033] Please refer to the attached Figure 4 - attached Figure 5, the angle adjustment component 5 includes a mounting shell 51. The mounting shell 51 is installed on the top side of the telescopic block 3. Inside the mounting shell 51, a first micro-motor 52 and a second micro-motor 53 are installed. The output ends of the first micro-motor 52 and the second micro-motor 53 are respectively fixedly connected with a worm 54 and a rotating frame 55. Inside the rotating frame 55, a rotating shaft 57 is rotatably connected. On the outer side of the rotating shaft 57, a worm gear 56 is fixedly connected. At both ends of the rotating shaft 57, connecting rods 58 are fixedly connected. The ultrasonic detection head 4 is connected to the telescopic block 3 through the connecting rods 58. The worm 54 meshes with the worm gear 56. On one side of the mounting shell 51 close to the ultrasonic detection head 4, a movable groove 59 is opened. The connecting rod 58 is arranged in the middle of the movable groove 59.

[0034] Specifically, by starting the first micro-motor 52, the motor shaft of the first micro-motor 52 rotates at a high speed, driving the worm 54 fixed thereto to rotate synchronously. Because the worm 54 meshes precisely with the worm gear 56, the rotational power of the worm 54 is efficiently transmitted to the worm gear 56, causing the worm gear 56 to rotate around its own axis. The worm gear 56 is fixed on the outer side of the rotating shaft 57, so the rotating shaft 57 rotates accordingly. The connecting rods 58 at both ends of the rotating shaft 57 are also driven by it, making a circular motion centered on the rotating shaft 57, and then driving the ultrasonic detection head 4 connected to the connecting rods 58 to generate an angular change in the Y-axis direction, completing the preliminary adjustment of the detection angle. When a more precise adjustment of the detection angle is required, by starting the second micro-motor 53, the second micro-motor 53 operates and drives the rotating frame 55 to rotate around a specific axis. The rotation of the rotating frame 55 pulls the connected connecting rod 58, causing the connecting rod 58 to displace around a new fulcrum on the basis of the existing angle, and then driving the ultrasonic detection head 4 to perform a fine angular adjustment in the X-axis direction. This angle adjustment mechanism with the cooperation of two motors helps to improve the control accuracy of the detection angle of the ultrasonic detection head 4 in the two-dimensional plane, adapt to various bending and undulating angles of the pipeline under complex working conditions, and thus helps to improve the detection accuracy.

[0035] Please refer to the appendix Figure 2 and the appendix Figure 7 , the static elimination component 6 includes a current collector 61. The current collector 61 is installed in the middle of the vehicle body 1. One end of the current collector 61 away from the vehicle body 1 is fixedly connected with a grounding wire 62.

[0036] Specifically, by installing a condenser 61 in the middle of the vehicle body 1, with the special electrostatic induction material and structural design of the condenser 61, the surface of the condenser 61 can continuously capture the static electricity generated by the vehicle body 1 during driving due to friction with air, equipment operation, etc., as well as the static electricity caused by current changes and signal transmission during the operation of the detection component. After the condenser 61 collects the static electricity, it is safely and efficiently introduced into the ground through the grounding wire 62 connected to it. The grounding wire 62 has good electrical conductivity, with one end firmly connected to the condenser 61 and the other end in contact with the ground, ensuring reliable release of the static electricity. This method helps to avoid the static electricity release phenomenon caused by static electricity accumulation and provides a key guarantee for the safe and stable operation of the detection device in an explosive and flammable working environment.

[0037] Please refer to the appendix Figure 2 and the appendix Figure 8 , the processing component 7 includes a housing 71, the housing 71 is fixedly connected to the top of the vehicle body 1, a processor 72 is installed inside the housing 71, a transmission line 73 is fixedly connected to the top of the housing 71, a display screen 74 and an operation button 75 are installed on one side of the housing 71 away from the support block 2, an alarm 76 is installed on the top of the vehicle body 1, and the display screen 74 is arranged on the left side of the operation button 75.

[0038] Specifically, the ultrasonic detection head 4 emits an ultrasonic beam. After the beam contacts the natural gas hydrogen - doped pipeline, part of it is reflected back according to the pipeline characteristics. When the pipeline leaks, the gas flow at the leakage point changes the frequency, amplitude, and phase of the reflected wave. The ultrasonic detection head 4 generates an electrical signal, and the electrical signal is transmitted to the processor 72 through the transmission line 73. During this process, the operator can flexibly adjust the preset algorithm parameters of the processor 72 through the operation button 75 according to the detection scenario and pipeline parameters. The processor 72 uses a professional algorithm to analyze and process the signal. Once a leakage is determined, the processor 72 sends a trigger signal to the alarm 76, and the alarm 76 emits a high - decibel alarm to remind relevant personnel, effectively locating and accurately evaluating the leakage degree and providing relevant data for repair and emergency rescue.

[0039] Please refer to the appendix Figure 1 - the appendix Figure 2 , the auxiliary component 8 includes a mounting plate 81, the mounting plate 81 is fixedly connected to one end of the connecting rod 58 away from the telescopic block 3, a fixing block 82 is fixedly connected to one side of the mounting plate 81 close to the ultrasonic detection head 4, a roller 83 is rotatably connected inside the fixing block 82, and the ultrasonic detection head 4 is installed on one side of the mounting plate 81 close to the roller 83.

[0040] Specifically, by designing the roller 83 to be in direct contact with the pipeline surface, when the detection device travels along the natural gas hydrogen-doped pipeline relying on the movement of the vehicle body 1, the roller 83 rolls on the pipeline surface by virtue of its good rolling performance, and a firm connection is formed between the roller 83 and the detection part. During the movement of the detection device, the roller 83 continuously rolls, and with a relatively small rolling friction force, it assists the detection part to move smoothly along the pipeline direction. This not only effectively reduces the sliding friction between the detection part and the pipeline surface, reduces the energy loss generated by friction during the movement of the detection device, extends the service life of the key components of the detection device, but also ensures that the detection part always maintains a stable detection posture during the movement, which helps to improve the stability and reliability of the detection process of the detection device.

[0041] Working principle: When the detection device is started, the vehicle-mounted power supply 15 powers the whole device. The vehicle body 1 travels to the area of the natural gas hydrogen-doped pipeline to be detected by relying on the wheels 13. If the detection height needs to be adjusted, the hydraulic rod 9 is started, and the output end of the hydraulic rod 9 pushes the telescopic block 3 to slide in the through groove 16 of the support block 2. At the same time, the telescopic rod 10 plays an auxiliary support and stability role, and the slider 11 slides in the chute 12 inside the support block 2 to ensure the smoothness of the telescopic process, thereby realizing the adjustment of the detection part height.

[0042] When the detection angle needs to be adjusted, start the first micro motor 52 to rotate and drive the worm 54 to rotate. Since the worm 54 meshes with the worm gear 56, the rotating shaft 57 is driven to rotate, and the connecting rods 58 at both ends of the rotating shaft 57 rotate accordingly. The connecting rod 58 drives the ultrasonic detection head 4 to be adjusted in the Y-axis direction to realize the preliminary angle adjustment. Start the second micro motor 53 to drive the rotating frame 55 to rotate. The rotating frame 55 drives the connecting rod 58 to rotate, and the connecting rod 58 drives the ultrasonic detection head 4 to be adjusted in the X-axis direction to further finely adjust the detection angle of the ultrasonic detection head 4.

[0043] During the detection process, through the contact of the roller 83 with the pipeline surface, the roller 83 assists the detection part to move along the pipeline during the movement of the detection device. The ultrasonic detection head 4 continuously emits ultrasonic waves and receives the reflected waves. When there is a leak in the pipeline, the characteristics of the reflected waves will change due to the gas flow at the leak point. The ultrasonic detection head 4 transmits the collected signals to the processor 72 through the transmission line 73. The processor 72 analyzes, compares and calculates the signals according to the preset algorithm to judge whether there is a leak and information such as the leak position and concentration, and displays the results on the display screen 74. If a leak is detected, the processor 72 controls the alarm 76 to sound an alarm.

[0044] At the same time, during the whole detection process, the static electricity generated by the vehicle body 1 and the detection components is collected by the condenser 61, and the static electricity is introduced into the ground through the grounding wire 62 to prevent the accumulation of static electricity from causing potential safety hazards.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A leakage detection device for a natural gas hydrogen - blended pipeline, comprising a vehicle body (1), characterized in that, A support block (2) is fixedly connected to the top of the vehicle body (1). A telescopic block (3) is slidably connected inside the support block (2). An angle adjustment assembly (5) is arranged on the top side of the telescopic block (3). An auxiliary assembly (8) is arranged on the side of the angle adjustment assembly (5) away from the telescopic block (3). Ultrasonic detection heads (4) are evenly installed on the side of the auxiliary assembly (8) away from the angle adjustment assembly (5). Wheels (13) are installed at the four corners of the bottom of the vehicle body (1). A processing assembly (7) is arranged on the side of the vehicle body (1) away from the wheels (13). A vehicle lamp (14) is installed at one end of the vehicle body (1). A vehicle-mounted power supply (15) is installed at the other end of the vehicle body (1). An electrostatic elimination assembly (6) is arranged on the side of the vehicle body (1) away from the support block (2). A hydraulic rod (9) is installed inside the support block (2). The telescopic block (3) is connected to the support block (2) through the output end of the hydraulic rod (9). Sliders (11) are symmetrically and fixedly connected to both ends of the telescopic block (3). A telescopic rod (10) is installed between the support block (2) and the telescopic block (3).

2. The leak detection device for a natural gas hydrogen - blended pipeline according to claim 1, wherein, The angle adjustment assembly (5) includes a mounting shell (51). The mounting shell (51) is installed on the top side of the telescopic block (3). A micro motor one (52) and a micro motor two (53) are installed inside the mounting shell (51). The output ends of the micro motor one (52) and the micro motor two (53) are respectively fixedly connected to a worm (54) and a rotating frame (55). A rotating shaft (57) is rotatably connected inside the rotating frame (55). A worm gear (56) is fixedly connected to the outer side of the rotating shaft (57). Connecting rods (58) are fixedly connected to both ends of the rotating shaft (57).

3. A leakage detection device for a natural gas hydrogen-blended pipeline according to claim 1, characterized in that, The electrostatic elimination assembly (6) includes a current collector (61). The current collector (61) is installed in the middle of the vehicle body (1). One end of the current collector (61) away from the vehicle body (1) is fixedly connected to a ground wire (62).

4. The leakage detection device for a natural gas hydrogen - blended pipeline according to claim 1, wherein, The processing assembly (7) includes a housing (71). The housing (71) is fixedly connected to the top of the vehicle body (1). A processor (72) is installed inside the housing (71). A transmission line (73) is fixedly connected to the top of the housing (71). A display screen (74) and operation buttons (75) are installed on the side of the housing (71) away from the support block (2). An alarm (76) is installed on the top of the vehicle body (1). The display screen (74) is arranged on the left side of the operation buttons (75).

5. The leak detection device for a natural gas hydrogen-blended pipeline according to claim 2, wherein, The auxiliary assembly (8) includes a mounting plate (81). The mounting plate (81) is fixedly connected to the end of the connecting rod (58) away from the telescopic block (3). A fixing block (82) is fixedly connected to the side of the mounting plate (81) close to the ultrasonic detection head (4). A roller (83) is rotatably connected inside the fixing block (82). The ultrasonic detection head (4) is installed on the side of the mounting plate (81) close to the roller (83).

6. The leak detection device for a natural gas hydrogen-blended pipeline according to claim 1, wherein, A through groove (16) is arranged inside the support block (2), and the telescopic block (3) is slidably connected to the middle of the through groove (16).

7. The leak detection device for a natural gas hydrogen-blended pipeline according to claim 1, characterized in that, A sliding groove (12) is formed inside the support block (2), and the slider (11) is slidably connected to the middle of the sliding groove (12).

8. The leak detection device for a natural gas hydrogen - blended pipeline according to claim 2, wherein, The ultrasonic detection head (4) is connected to the telescopic block (3) through the connecting rod (58), and the worm (54) is meshed with the worm gear (56).

9. The leak detection device for a natural gas hydrogen-doped pipeline according to claim 2, characterized in that, An activity groove (59) is formed on one side of the mounting shell (51) close to the ultrasonic detection head (4), and the connecting rod (58) is arranged in the middle of the activity groove (59).

10. A leakage detection device for a natural gas hydrogen-blended pipeline according to claim 4, characterized in that, The processor (72) is electrically connected to the ultrasonic detection head (4), the display screen (74), the operation button (75), and the alarm (76) through the transmission line (73).

Images