An underground pipeline leakage detection device

Abstract

The present invention discloses an underground pipeline leakage detection device, which relates to the technical field of underground pipeline detection, and comprises a symmetrically distributed motor frame and a connecting rod arranged in the motor frame, wherein a gas detector for monitoring leaked gas is fixedly installed at the center of the connecting rod, and a reversible screw slide is provided above the gas detector, and an acoustic detector is provided on the screw slide. Three positioning rods that can rotate synchronously with the acoustic detector are provided in front of the gas detector, and the three positioning rods are arranged at equal distances along a circular trajectory, and a first flip frame, a second flip frame and a push-back frame that can rotate synchronously are respectively fixed on the three positioning rods. The present invention can effectively reduce the impact of technical limitations and environmental complexity on the leakage detection process, and through a multi-technical and multi-dimensional monitoring method, it can significantly improve the detection reliability, reduce the misjudgment phenomenon in the leakage detection process, and improve the accuracy of the detection work.

Description

Technical Field

[0001] The present invention relates to the technical field of underground pipeline detection, and in particular to underground pipeline leakage detection equipment. Background Art

[0002] Gas transmission pipelines buried underground mainly include two types: gas pipelines and industrial pipelines. In gas pipelines, natural gas leakage may cause explosions when encountering open flames, and the accumulation of flammable gases such as methane in confined spaces may cause suffocation or explosions.

[0003] Existing underground gas pipelines are generally classified as either PE pipes or rigid pipes (metal pipes), depending on their material. For both PE and rigid pipes, the most common external detection technology used in actual pipeline leak monitoring is the use of gas detection equipment to detect gas leaks above ground. To conserve manpower, these devices are often mounted on electrically controlled mobile bases to perform detection.

[0004] However, due to the instability of the external environment, using a single gas detector for detection is prone to false alarms due to background gases in the environment, which can lead to deviations in the detection results. Furthermore, after the gas detector detects a gas leak and issues an alarm, personnel must search for the specific leak point within a certain area to verify the authenticity of the detection result, a time-consuming process. Therefore, the present invention provides an underground pipeline leak detection device to meet this need. Summary of the Invention

[0005] In view of the above problems, the present invention provides an underground pipeline leakage detection device.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an underground pipeline leakage detection device, comprising a symmetrically distributed motor frame and a connecting rod arranged in the motor frame, a gas detector for monitoring leaked gas fixedly installed at the center of the connecting rod, a flippable screw slide is provided above the gas detector, and an acoustic detector is provided on the screw slide. When the screw slide and the acoustic detector are flipped to the bottom of the gas detector, the acoustic detector moves laterally to find the pipeline gas leakage point.

[0007] Three positioning rods are provided in front of the gas detector and can rotate synchronously with the acoustic detector. The three positioning rods are arranged equidistantly along a circular trajectory, and the three positioning rods are respectively fixed with a first flipping frame, a second flipping frame and a push-back frame that can rotate synchronously. The second flipping frame and the push-back frame are distributed downward, and the first flipping frame is located above the second flipping frame and the push-back frame. When the three positioning rods rotate synchronously with the acoustic detector, the second flipping frame and the first flipping frame contact the ground in turn to turn over the surface soil of the ground.

[0008] Furthermore, a first synchronous rotating wheel and a second synchronous rotating wheel are respectively provided at both ends of the connecting rod, a gear ring is fixed to the outer periphery of the first synchronous rotating wheel, and a synchronous gear meshing with the gear ring is provided on the inner side of the motor frame.

[0009] The first synchronous rotating wheel and the second synchronous rotating wheel are both connected to the same guide seat through the first connecting rod, and the screw slide is installed on the guide seat. When the synchronous gear engages with the first synchronous rotating wheel and rotates, the guide seat and the second synchronous rotating wheel rotate synchronously, and the screw slide and the acoustic detector flip over.

[0010] Furthermore, the first synchronous rotating wheel and the second synchronous rotating wheel are both provided with a second connecting rod extending outward, and the ends of the symmetrically distributed second connecting rods are fixed with positioning plates. The same drive shaft is provided at the center of the two positioning plates, and a drive motor is provided on the outside of one of the positioning plates to control the rotation of the drive shaft.

[0011] Two power sprockets are installed on the drive shaft, distributed from left to right. Each power sprocket is engaged with three guide sprockets. The three guide sprockets are respectively installed on three positioning rods. Both ends of the three positioning rods are installed on the positioning discs. When the power sprocket engages with the guide sprocket and rotates, the three positioning rods rotate in the same direction.

[0012] Furthermore, the first flip frame and the second flip frame are both composed of a plurality of equally spaced frame bodies, and the frame bodies in the first flip frame and the second flip frame are staggered along the distribution direction of the positioning rods. The frame bodies are both composed of a straight plate part connected to the positioning rods and an arc plate part formed by bending the straight plate part. When the positioning rods rotate, the frame bodies of the first flip frame and the second flip frame both rotate toward the outside of the circular trajectory where the three positioning rods are located.

[0013] Furthermore, the push-back frame is a semi-cam structure. When the first flip frame and the second flip frame rotate toward the outside of the circular track where the three positioning rods are located, the protruding part of the push-back frame gradually moves toward the driving shaft.

[0014] Furthermore, the motor frame is provided with a driving gear coaxially distributed with the synchronous gear, the driving gear and the synchronous gear are connected through the same synchronous shaft, and the motor frame is provided with a second driving motor that can control the rotation of the synchronous shaft.

[0015] Furthermore, movable support seats are provided on both sides of the motor frame, and the two support seats are connected by a connecting plate. The connecting plate is located in front of the motor frame, and the support seat located on the same side as the driving gear is connected to the bottom of the driving gear through a rack engagement. Guide rails that are compatible with the moving trajectory of the support seat are provided on the lower outer side of the motor frame. When the driving gear rotates, the two support seats and the connecting plate move toward the front of the motor frame.

[0016] Furthermore, the bottom ends of the support seats are fixedly connected with support legs, and the support legs are triangular in structure. When the support seats move toward the front of the motor frame, the support legs are gradually exposed from the outside of the motor frame to the front of the motor frame.

[0017] In summary, the technical effects and advantages of the present invention are as follows:

[0018] 1. The present invention can effectively reduce the impact of technical limitations and environmental complexity on the leak detection process. Through monitoring methods in different dimensions, it can significantly improve detection reliability, reduce misjudgment in the leak detection process, and improve the accuracy of detection work.

[0019] 2. This invention can turn over the surface soil, allowing the acoustic detector to land smoothly above the ground and monitor gas leaks. Low-concentration gas or slow-leaking gas can be accurately captured by the acoustic detector, facilitating leak location. This ensures the reliability of leak points and further improves the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the second viewing angle of the present invention.

[0023] Figure 3 It is a structural schematic diagram of the first flipping frame, the second flipping frame and the push-back frame in the natural state of the present invention.

[0024] Figure 4 This is a schematic structural diagram of the first flip frame, the second flip frame and the push-back frame in the natural state from a second perspective of the present invention.

[0025] Figure 5This is a schematic diagram of the positions of the first synchronous rotor, the second synchronous rotor, the gas detector and the acoustic detector of the present invention.

[0026] Figure 6 It is a structural schematic diagram of the first flip frame, the second flip frame and the push-back frame of the present invention in the rotated-out state.

[0027] Figure 7 It is a schematic diagram of the local structure of the first flip frame, the second flip frame and the push-back frame in the rotated-out state of the present invention.

[0028] Figure 8 This is a structural diagram of the acoustic detector of the present invention in a flipped state.

[0029] Figure 9 This is a schematic diagram of the second viewing angle of the acoustic detector of the present invention in the flipped state.

[0030] In the figure: 1. Motor frame; 2. Connecting rod; 3. Gas detector; 4. First synchronous rotating wheel; 41. Synchronous gear; 42. First connecting rod; 43. Second connecting rod; 5. Second synchronous rotating wheel; 6. Guide seat; 7. Screw slide; 8. Acoustic detector; 9. Drive shaft; 10. Power gear disc; 11. Guide gear disc; 12. Positioning rod; 13. First flip frame; 14. Second flip frame; 15. Push back frame; 16. Positioning plate; 17. Drive motor 1; 18. Drive gear; 19. Synchronous shaft; 20. Drive motor 2; 21. Support seat; 22. Support foot; 23. Connecting plate; 24. Guide rail. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1: Reference Figure 1 、 Figure 2An underground pipeline leakage detection device shown in the figure includes a symmetrically distributed motor frame 1 and a connecting rod 2 arranged in the motor frame 1, and a gas detector 3 for monitoring leaked gas is fixedly installed at the center of the connecting rod 2. During the actual operation of the present invention, the motor frame 1 carries the connecting rod 2 and the gas detector 3 and moves along the distribution direction of the underground pipeline on the ground. During the movement, the gas detector 3 performs detection work on the ground. If there is a leak point in the underground pipeline, the leaked gas will overflow above the ground. After the gas detector 3 captures the leaked gas, it triggers an audible and visual alarm and automatically records the data. Subsequently, the control system automatically saves the timestamp and performs GPS positioning. The gas type, concentration value and environmental parameters (temperature, humidity) are recorded and archived to facilitate subsequent manual maintenance work. The gas detector 3 here can be an existing natural gas detection sensor such as a catalytic combustion sensor, an infrared absorption sensor, a semiconductor sensor, a laser spectrum sensor, etc.

[0033] In actual pipeline leak monitoring, due to the instability of the external environment, using a single gas detector 3 for detection is susceptible to environmental influences, resulting in false alarms due to background gases (such as biogas), which in turn leads to deviations in the detection results. Furthermore, after the gas detector 3 detects a gas leak and issues an alarm, personnel must search for the specific leak point within a certain area to verify the authenticity of the detection result, a time-consuming process.

[0034] like Figure 1 、 Figure 2 As shown, in order to accurately locate the leakage position and eliminate detection errors, in the present invention, a reversible screw slide 7 is provided above the gas detector 3, and an acoustic detector 8 is provided on the screw slide 7. The acoustic detector 8 here mainly refers to an ultrasonic microphone array. When the screw slide 7 and the acoustic detector 8 are flipped to the bottom of the gas detector 3, the screw slide 7 controls the lateral movement of the acoustic detector 8, and the sound wave signal generated by the pipeline leakage can be captured by the microphone of the acoustic detector 8. When the sound source positioning coincides with the gas detection position, the leakage point can be confirmed and the leakage point can be reported to the control system.

[0035] During the detection process, the gas sensor confirms the leaked substance (methane concentration exceeds the standard), and the acoustic sensor locates the leak point, thereby reducing the false alarm rate (such as eliminating interference from other gases). It can effectively reduce the impact of single technical limitations and environmental complexity on the working process of the gas detector 3. Through monitoring methods in different dimensions, it significantly improves detection reliability, reduces misjudgment in the leak detection process, and improves the accuracy of detection work.

[0036] The present invention is applied to the leakage detection of pipelines buried under the open earth ground outdoors. The surface layer of the earth ground is in direct contact with the external environment for a long time. Trampling by people and animals in the external environment will cause the surface layer of the soil to be directly compacted, destroying the pore structure. Especially when the soil is moist, external forces are more likely to cause the particles to be closely arranged, resulting in the formation of a compacted layer on the soil surface. In addition, when it rains, the soil on the surface of the soil expands after absorbing water and shrinks when it dries, which can also easily form a hard surface structure. Therefore, when low-concentration gas leaked in the pipeline or slowly leaking gas overflows through the soil, it is difficult to be accurately captured by the acoustic detector 8 based on the compacted state of the soil surface, and the detection is difficult and time-consuming.

[0037] Therefore, if Figure 3 、 Figure 4 As shown, in the present invention, three positioning rods 12 are provided in front of the gas detector 3, which can rotate synchronously with the acoustic detector 8. The three positioning rods 12 are arranged equidistantly along a circular trajectory, and the three positioning rods 12 are respectively fixed with a first turning frame 13, a second turning frame 14, and a push-back frame 15 that can rotate synchronously. The second turning frame 14 and the push-back frame 15 are arranged at the bottom, and the first turning frame 13 is located above the second turning frame 14 and the push-back frame 15. When the three positioning rods 12 rotate synchronously with the acoustic detector 8, the second turning frame 14 and the first turning frame 13 contact the ground in turn, turning the surface soil of the ground.

[0038] The second turning frame 14 and the first turning frame 13 contact the ground in sequence, turning the surface soil. After that, the acoustic detector 8 smoothly lands on the ground and moves horizontally to monitor the leaking gas and locate the leak. This ensures the reliability of the leak point and further improves the accuracy of the detection work.

[0039] Specifically, such as Figure 5 As shown, a first synchronous rotating wheel 4 and a second synchronous rotating wheel 5 are provided at both ends of the connecting rod 2, a gear ring is fixed on the outer periphery of the first synchronous rotating wheel 4, and a synchronous gear 41 meshing with the gear ring is provided on the inner side of the motor frame 1. The first synchronous rotating wheel 4 and the second synchronous rotating wheel 5 are both connected to the same guide seat 6 through a first connecting rod 42, and a screw slide 7 is installed on the guide seat 6. When the synchronous gear 41 meshes with the first synchronous rotating wheel 4 and rotates, the guide seat 6 and the second synchronous rotating wheel 5 rotate synchronously, and the screw slide 7 and the acoustic detector 8 flip their positions and fall directly below the gas detector 3. Subsequently, the acoustic detector 8 moves laterally along the distribution direction of the connecting rod 2 to find the specific leakage point.

[0040] Example 2: Figure 5 、 Figure 8As shown, both the first and second synchronous wheels 4, 5 are provided with outwardly extending second engagement rods 43, and the ends of the symmetrically distributed second engagement rods 43 are fixed with positioning plates 16. Therefore, when the first and second synchronous wheels 4, 5 rotate, the positioning plates 16 rotate synchronously under the connection of the second engagement rods 43.

[0041] The same drive shaft 9 is located at the center of each of the two positioning disks 16. A drive motor 17 is located on the outside of one of the positioning disks 16 to control the rotation of the drive shaft 9. Two power geared disks 10 are mounted on the drive shaft 9, distributed from left to right. Each power geared disk 10 is meshed with three guide geared disks 11. These three guide geared disks 11 are mounted on three positioning rods 12, each of which is mounted on the positioning disk 16 at both ends. Before the positioning disk 16 rotates with the positioning rods 12, the power of the drive motor 17 causes the power geared disks 10 to mesh with the guide geared disks 11, causing the three positioning rods 12 to rotate in the same direction, causing the frames of the first and second flipping frames 13 and 14 to rotate toward the outside of the circular trajectory of the three positioning rods 12. This exposes the first and second flipping frames 13 and 14.

[0042] Therefore, the three positioning rods 12 and the first turning frame 13, the second turning frame 14 and the push-back frame 15 connected thereto can make the second turning frame 14 and the first turning frame 13 contact the ground in sequence as the positioning plate 16 rotates, so as to achieve the purpose of turning the surface soil of the ground. Figure 6 shown.

[0043] When the second turning frame 14 and the first turning frame 13 have turned the surface soil of the ground and the acoustic detector 8 has completed its detection work, the three positioning rods 12 and the first turning frame 13, the second turning frame 14 and the push-back frame 15 connected thereto rotate and reset along with the positioning plate 16, and the acoustic detector 8 also rotates and resets accordingly. Before resetting, the drive motor 17 needs to drive the power gear disc 10 to engage the guide gear disc 11 and rotate again, so that the three positioning rods 12 rotate in the same direction again, so as to achieve the purpose of driving the frame bodies of the first turning frame 13 and the second turning frame 14 to rotate toward the inner side of the circular trajectory where the three positioning rods 12 are located, so that the frame bodies of the first turning frame 13 and the second turning frame 14 return to their original positions, see Figure 2 shown.

[0044] After the first turning frame 13 and the second turning frame 14 are returned to their original positions, the first turning frame 13, the second turning frame 14 and the push-back frame 15 will not be embedded in the soil layer for a second time during the process of resetting with the positioning plate 16, thereby avoiding secondary damage to the soil layer. At the same time, during the resetting process of the first turning frame 13 and the second turning frame 14, part of the soil that has been pried away to the original position can also be pushed back, which has a protective effect on the ground environment and reduces the workload required for leveling and repairing the ground in the later stage.

[0045] In the present invention, the first flip frame 13 and the second flip frame 14 are each composed of a plurality of equally spaced frame members, and the frame members in the first flip frame 13 and the second flip frame 14 are staggered along the distribution direction of the positioning rods 12. The frame members are each composed of a straight plate portion connected to the positioning rods 12 and an arc plate portion formed by bending the straight plate portion.

[0046] When the positioning rod 12 rotates, the frames of the first turning frame 13 and the second turning frame 14 both rotate toward the outside of the circular trajectory where the three positioning rods 12 are located. Therefore, when the second turning frame 14 and the first turning frame 13 successively contact the muddy ground, the arc plate parts can pry up the soil layer to achieve the purpose of turning the soil layer quickly and stably. In addition, since the frames of the second turning frame 14 and the first turning frame 13 are staggered along the distribution direction of the positioning rod 12, the second turning frame 14 and the first turning frame 13 can fully turn over the soil layer under the gas detector 3 during the rotation process, thereby ensuring the work quality, see Figure 3 、 Figure 6 and Figure 7 shown.

[0047] It is worth noting that in the present invention, the push-back frame 15 is a semi-cam structure. When the first flip frame 13 and the second flip frame 14 rotate toward the outside of the circular track where the three positioning rods 12 are located, the protruding portion of the push-back frame 15 gradually moves toward the direction of the drive shaft 9. Figure 3 、 Figure 4 and Figure 7 As shown. Therefore, when the second flip frame 14 and the first flip frame 13 successively contact the ground, the protruding portion of the push-back frame 15 does not contact the ground. However, when the positioning plate 16, carrying the positioning rod 12, and the second flip frame 14 and the first flip frame 13 return to their original positions, the protruding portion of the push-back frame 15 gradually moves away from the drive shaft 9, as the second flip frame 14 and the first flip frame 13 have already returned to their original positions.

[0048] When the specific leakage point of the pipeline is determined, in the process of the first turning frame 13, the second turning frame 14 and the push-back frame 15 rotating and resetting as the positioning plate 16, the first turning frame 13 and the second turning frame 14 in the retracted state can push the raised soil part back to the original position, and the protruding part of the push-back frame 15 following immediately thereafter can comprehensively flatten the turned soil, which has a good leveling effect on the ground, effectively avoids the increase of gas overflow, and has a protective effect on the ground.

[0049] Example 3: Figure 8 、 Figure 9 As shown, the motor frame 1 is provided with a drive gear 18 coaxially distributed with the synchronous gear 41. The drive gear 18 and the synchronous gear 41 are connected by the same synchronous shaft 19. The motor frame 1 is provided with a second drive motor 20 for controlling the rotation of the synchronous shaft 19. When the second drive motor 20 is running, under the power of the drive gear 18 and the synchronous gear 41, the first synchronous rotating wheel 4 and the second synchronous rotating wheel 5 can be rotated synchronously, thereby achieving the purpose of driving the acoustic detector 8 to flip the position.

[0050] Based on Example 2, the second turning frame 14 and the first turning frame 13 sequentially contact the ground and turn over the surface soil, which actually moves toward the rear of the gas detector 3. During the turning process, due to the force exerted on the ground by the first turning frame 13 and the second turning frame 14, the entire device is likely to fall forward, affecting the stability of the device during operation.

[0051] In the present invention, Figure 8 、 Figure 9 As shown, movable support blocks 21 are provided on both sides of the motor frame 1. The two support blocks 21 are connected by a connecting plate 23, which is located in front of the motor frame 1. The support block 21 on the same side as the drive gear 18 is connected to the drive gear 18 directly below the drive gear 18 through a rack meshing connection. Guide rails 24 are provided on the outer side and lower part of the motor frame 1 to match the movement trajectory of the support blocks 21. When the drive gear 18 rotates, the two support blocks 21 and the connecting plate 23 move toward the front of the motor frame 1.

[0052] After the two support seats 21 and the connecting plate 23 move toward the front of the motor frame 1, if the entire device falls forward, the support seat 21 will also tilt and contact the ground, which has a supporting effect on the device, avoiding the device from falling over and maintaining the stability of the entire device during operation.

[0053] like Figure 8 、 Figure 9As shown, the bottom ends of the support bases 21 are fixedly connected to support legs 22, each of which has a triangular structure. When the support base 21 moves toward the front of the motor frame 1, the support legs 22 gradually emerge from the outside of the motor frame 1 to the front of the motor frame 1. The provision of the support legs 22 improves the stability of the support base 21. When the entire device falls forward, the support legs 22 can quickly contact the ground, promptly preventing the device from falling forward, and further ensuring the stability of the entire device.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An underground pipeline leakage detection device, comprising a symmetrically distributed motor frame (1) and a connecting rod (2) arranged in the motor frame (1), wherein a gas detector (3) for monitoring leaked gas is fixedly installed at the center of the connecting rod (2), characterized in that: A reversible screw slide (7) is provided above the gas detector (3), and an acoustic detector (8) is provided on the screw slide (7). When the screw slide (7) and the acoustic detector (8) are turned over to the bottom of the gas detector (3), the acoustic detector (8) moves laterally to find the gas leakage point in the pipeline; The gas detector (3) is provided with three positioning rods (12) in front thereof which can rotate synchronously with the acoustic detector (8). The three positioning rods (12) are arranged equidistantly along a circular track, and a first flipping frame (13), a second flipping frame (14) and a push-back frame (15) which can rotate synchronously are fixed on the three positioning rods (12). The second flipping frame (14) and the push-back frame (15) are arranged at the bottom, and the first flipping frame (13) is located above the second flipping frame (14) and the push-back frame (15). When the three positioning rods (12) rotate synchronously with the acoustic detector (8), the second flipping frame (14) and the first flipping frame (13) contact the ground in turn to turn over the surface soil of the ground. A first synchronous rotating wheel (4) and a second synchronous rotating wheel (5) are respectively provided at both ends of the connecting rod (2); a gear ring is fixed to the outer periphery of the first synchronous rotating wheel (4); and a synchronous gear (41) meshing with the gear ring is provided on the inner side of the motor frame (1); The first synchronous rotating wheel (4) and the second synchronous rotating wheel (5) are both connected to the same guide seat (6) via a first connecting rod (42), and the screw slide (7) is installed on the guide seat (6). When the synchronous gear (41) engages with the first synchronous rotating wheel (4) and rotates, the guide seat (6) and the second synchronous rotating wheel (5) rotate synchronously, and the screw slide (7) and the acoustic detector (8) flip over. The first synchronous rotating wheel (4) and the second synchronous rotating wheel (5) are both provided with second connecting rods (43) extending outwards, and the ends of the symmetrically distributed second connecting rods (43) are both fixed with positioning plates (16), and the centers of the two positioning plates (16) are both provided with a same driving shaft (9), and a driving motor (17) for controlling the rotation of the driving shaft (9) is provided on the outer side of one of the positioning plates (16); The driving shaft (9) is provided with two power toothed discs (10) distributed from left to right. Each power toothed disc (10) is meshed with three guide toothed discs (11) on the outside. The three guide toothed discs (11) are respectively mounted on three positioning rods (12). Both ends of the three positioning rods (12) are mounted on the positioning disc (16). When the power toothed disc (10) meshes with the guide toothed disc (11) and rotates, the three positioning rods (12) all rotate in the same direction.

2. The underground pipeline leakage detection device according to claim 1, characterized in that: The first flip frame (13) and the second flip frame (14) are both composed of a plurality of equally spaced frame bodies, and the frame bodies in the first flip frame (13) and the second flip frame (14) are staggered along the distribution direction of the positioning rods (12). The frame bodies are both composed of a straight plate portion connected to the positioning rods (12) and an arc plate portion formed by bending the straight plate portion. When the positioning rods (12) rotate, the frame bodies of the first flip frame (13) and the second flip frame (14) rotate toward the outside of the circular trajectory where the three positioning rods (12) are located.

3. The underground pipeline leakage detection device according to claim 1, characterized in that: The push-back frame (15) is a semi-cam structure. When the first flip frame (13) and the second flip frame (14) rotate toward the outside of the circular track where the three positioning rods (12) are located, the protruding portion of the push-back frame (15) gradually moves toward the driving shaft (9).

4. The underground pipeline leakage detection device according to claim 1, characterized in that: The motor frame (1) is provided with a driving gear (18) coaxially distributed with the synchronous gear (41), the driving gear (18) and the synchronous gear (41) are connected via the same synchronous shaft (19), and the motor frame (1) is provided with a second driving motor (20) capable of controlling the rotation of the synchronous shaft (19).

5. The underground pipeline leakage detection device according to claim 4, characterized in that: Both sides of the motor frame (1) are provided with movable support seats (21), and the two support seats (21) are connected by a connecting plate (23). The connecting plate (23) is located in front of the motor frame (1). The support seat (21) located on the same side as the driving gear (18) is connected to the driving gear (18) directly below the driving gear (18) through a rack meshing. The outer side of the motor frame (1) is provided with a guide rail (24) adapted to the moving trajectory of the support seat (21). When the driving gear (18) rotates, the two support seats (21) and the connecting plate (23) move toward the front of the motor frame (1).

6. The underground pipeline leakage detection device according to claim 5, characterized in that: The bottom ends of the support seats (21) are fixedly connected to support legs (22), and the support legs (22) are triangular in structure. When the support seats (21) move toward the front of the motor frame (1), the support legs (22) are gradually exposed from the outside of the motor frame (1) to the front of the motor frame (1).

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