Underground pipeline leakage detection equipment

Abstract

The invention discloses underground pipeline leakage detection equipment, and relates to the technical field of underground pipeline detection, the underground pipeline leakage detection equipment comprises symmetrically distributed motor frames and a connecting rod arranged in the motor frames, a gas detector used for monitoring leaked gas is fixedly installed at the center of the connecting rod, a turnable screw rod sliding table is arranged above the gas detector, and the screw rod sliding table is fixedly connected with the motor frames. And an acoustic detector is arranged on the screw rod sliding table. Three positioning rods capable of synchronously rotating with the acoustic detector are arranged in front of the gas detector, the three positioning rods are arranged at equal intervals along a circumferential track, and a first turning frame, a second turning frame and a push-back frame which can synchronously rotate are respectively fixed on the three positioning rods. According to the invention, the influence of technical limitation and environmental complexity on the leakage detection process can be effectively reduced, through a multi-technology and multi-dimensional monitoring mode, the detection reliability is remarkably improved, the misjudgment phenomenon in the leakage detection process is reduced, and the accuracy of the detection work is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground pipeline detection, and particularly to an underground pipeline leakage detection device. Background Art

[0002] The gas transmission pipelines buried underground mainly include two types: gas pipelines and industrial pipelines. In gas pipelines, natural gas leakage can cause an explosion when encountering an open flame, and the accumulation of combustible gases such as methane in a confined space may cause asphyxiation or deflagration. In industrial pipelines, the leakage of toxic gases will directly threaten the health of personnel and even lead to group poisoning incidents. Underground pipeline leakage detection is a comprehensive manifestation of the safety bottom line, environmental protection red line, economic necessity, and legal obligation. Through systematic detection, not only can catastrophic accidents be avoided, but also the long-term operation and maintenance costs can be reduced. It is a core link that cannot be ignored in modern urban management and industrial operation.

[0003] Existing pipelines buried underground and used for gas transmission can be mostly divided into two materials: PE pipelines or rigid pipelines (metal pipelines) according to different pipeline materials. Whether it is a PE pipeline or a rigid pipeline, in the actual process of pipeline leakage monitoring work, the external detection technology mostly uses gas detection equipment to detect the gas leaked above the ground. During the work process, to save human resources, the gas detection equipment is mostly carried by an electrically controllable mobile base to implement the detection work.

[0004] However, due to the instability of the external environment, the method of using a single gas detector for detection work is prone to false alarms due to background gases in the environment, which will lead to deviations in the detection results. And when the gas detector monitors the leaked gas and alarms, the staff needs to search for the specific leakage point within a certain area to verify the authenticity of the detection result, and the time consumed in this process is relatively long. Therefore, the present invention provides an underground pipeline leakage detection device to meet the requirements. 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 object, the present invention provides the following technical solution: An underground pipeline leakage detection device includes symmetrically distributed motor frames and a connecting rod disposed within the motor frames. A gas detector for monitoring leaked gas is fixedly installed at the center of the connecting rod. An invertible 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 below the gas detector, the acoustic detector moves horizontally to find the gas leakage point of the pipeline.

[0007] In front of the gas detector, there are three positioning rods that can rotate synchronously with the acoustic detector. The three positioning rods are arranged equidistantly along a circular trajectory, and a first turning frame, a second turning frame, and a pushing-back frame that can rotate synchronously are respectively fixed on the three positioning rods. The second turning frame and the pushing-back frame are distributed lower, and the first turning frame is located above the second turning frame and the pushing-back frame. When the three positioning rods rotate synchronously with the acoustic detector, the second turning frame and the first turning frame successively contact the ground to turn the surface soil of the ground.

[0008] Further, first synchronous wheels and second synchronous wheels are respectively arranged at both ends of the connecting rod. A toothed ring is fixed on the outer periphery of the first synchronous wheel, and a synchronous gear meshing with the toothed ring is arranged inside the motor frame.

[0009] Both the first synchronous wheel and the second synchronous wheel are connected to the same guiding seat through a first connecting rod. The screw rod sliding table is installed on the guiding seat. When the synchronous gear meshes with the first synchronous wheel, the guiding seat, and the second synchronous wheel to rotate, the screw rod sliding table and the acoustic detector flip positions.

[0010] Further, second connecting rods extending outward are arranged on both the first synchronous wheel and the second synchronous wheel. Positioning disks are respectively fixed at the ends of the symmetrically distributed second connecting rods. A driving shaft is arranged at the centers of the two positioning disks. A driving motor one for controlling the rotation of the driving shaft is arranged outside one of the positioning disks.

[0011] Two power gear disks distributed from left to right are installed on the driving shaft. Three guiding gear disks are respectively meshed and connected outside each power gear disk. The three groups of guiding gear disks are respectively installed on the three positioning rods. Both ends of the three positioning rods are installed on the positioning disks. When the power gear disks mesh with the guiding gear disks to rotate, the three positioning rods all rotate in the same direction.

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

[0013] Further, the pushing-back frame has a semi-cam structure. When the first turning frame and the second turning frame rotate towards the outside of the circular trajectory where the three positioning rods are located, the protruding part of the pushing-back frame gradually moves towards the direction of the driving shaft.

[0014] Further, a driving gear coaxially distributed with the synchronous gear is arranged outside the motor frame. The driving gear and the synchronous gear are connected through the same synchronous shaft. A driving motor two for controlling the rotation of the synchronous shaft is arranged outside the motor frame.

[0015] Furthermore, movable support seats are provided on both sides of the motor frame. The two support seats are connected by a connecting plate. The connecting plate is located in front of the motor frame. The support seat on the same side as the driving gear is meshed and connected to the lower part of the driving gear through a rack. Guide rails adapted to the moving trajectories of the support seats are provided on the outer sides of the motor frame near the lower part. When the driving gear rotates, the two support seats and the connecting plate move forward towards the front of the motor frame.

[0016] Furthermore, feet are fixedly connected to the bottom ends of the support seats. The feet are all in a triangular structure. When the support seats move forward towards the front of the motor frame, the feet gradually expose from the outer side 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 influence brought by technical limitations and environmental complexity during the leakage detection process. Through monitoring methods in different dimensions, the detection reliability is significantly improved, the misjudgment phenomenon during the leakage detection process is reduced, and the accuracy of the detection work is improved.

[0019] 2. After the surface soil of the ground is turned over by the present invention, the acoustic detector can smoothly fall above the ground, and can monitor the leaked gas, so that low-concentration gas or slowly leaking gas can be accurately captured by the acoustic detector, in order to locate the leakage position. The reliability of the leakage point is guaranteed, and the accuracy of the detection work is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 2 It is a second perspective schematic diagram of the present invention.

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

[0024] Figure 4 It is a second perspective structure schematic diagram of the first turning frame, the second turning frame and the pushing-back frame of the present invention in the natural state.

[0025] Figure 5Schematic diagram of the positions of the first synchronous runner, the second synchronous runner, the gas detector and the acoustic detector of the present invention.

[0026] Figure 6 Schematic diagram of the structure of the first turning frame, the second turning frame and the return pushing frame of the present invention in the screwed-out state.

[0027] Figure 7 Partial structure schematic diagram of the first turning frame, the second turning frame and the return pushing frame of the present invention in the screwed-out state.

[0028] Figure 8 Schematic diagram of the structure of the acoustic detector of the present invention in the flipped state.

[0029] Figure 9 Second perspective schematic diagram 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 runner; 41, synchronous gear; 42, first connecting rod; 43, second connecting rod; 5, second synchronous runner; 6, guide seat; 7, screw rod slide; 8, acoustic detector; 9, drive shaft; 10, power gear disk; 11, guide gear disk; 12, positioning rod; 13, first turning frame; 14, second turning frame; 15, return pushing frame; 16, positioning disk; 17, drive motor 1; 18, drive gear; 19, synchronous shaft; 20, drive motor 2; 21, support seat; 22, support leg; 23, connecting plate; 24, guide rail. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments 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.

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

[0033] During the actual pipeline leakage monitoring process, due to the instability of the external environment, the method of using a single gas detector 3 for detection is easily affected by the external environment and may generate false alarms due to background gases (such as biogas), resulting in deviations in the detection results. Moreover, after the gas detector 3 monitors the leakage gas and alarms, the staff needs to search for the specific leakage point within a certain area to verify the authenticity of the detection result, and the time consumed in this process is relatively long.

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

[0035] During the detection process, the gas sensor confirms the leakage substance (exceeding the methane concentration standard), and the acoustic sensor locates the leakage point, thereby reducing the false alarm rate (such as excluding the interference of other gases), effectively reducing the influence of the limitations of a single technology and the complexity of the environment on the operation of the gas detector 3. Through different-dimensional monitoring methods, the detection reliability is significantly improved, the misjudgment phenomenon during the leakage detection process is reduced, and the accuracy of the detection work is improved.

[0036] The present invention is applied to the pipeline leakage detection work buried under the open outdoor muddy ground. The surface layer of the muddy ground is in direct contact with the external environment for a long time. The trampling of humans and livestock in the external environment will directly compact the soil surface layer and damage the pore structure. Especially when the soil is wet, 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. Moreover, when it rains, the soil on the surface layer absorbs water and swells, and shrinks when dry, which is also likely to form a hard surface structure. Therefore, when the low-concentration gas leaked in the pipeline or the slowly leaking gas passes through the soil and overflows, it is difficult to be accurately captured by the acoustic detector 8 based on the compacted state of the soil surface layer, the detection difficulty is large, and it takes a long time.

[0037] Therefore, as Figure 3 , Figure 4 shows, in the present invention, there are three positioning rods 12 that can rotate synchronously with the acoustic detector 8 in front of the gas detector 3. The three positioning rods 12 are arranged equidistantly along a circular trajectory, and a first turning frame 13, a second turning frame 14, and a pushing-back frame 15 that can rotate synchronously are respectively fixed on the three positioning rods 12. The second turning frame 14 and the pushing-back frame 15 are distributed lower, and the first turning frame 13 is located above the second turning frame 14 and the pushing-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 sequence to turn the surface soil of the ground.

[0038] After the second turning frame 14 and the first turning frame 13 contact the ground in sequence and turn the surface soil of the ground, the acoustic detector 8 smoothly falls above the ground and moves horizontally to monitor the leaked gas and locate the leakage position. The reliability of the leakage point is ensured, and the accuracy of the detection work is further improved.

[0039] Specifically, as Figure 5 shows, both ends of the connecting rod 2 are respectively provided with a first synchronous runner 4 and a second synchronous runner 5. A toothed ring is fixed on the outer periphery of the first synchronous runner 4, and a synchronous gear 41 meshing with the toothed ring is provided inside the motor frame 1. Both the first synchronous runner 4 and the second synchronous runner 5 are connected to the same guide seat 6 through a first connecting rod 42. The lead screw slide 7 is installed on the guide seat 6. When the synchronous gear 41 meshes with the first synchronous runner 4, the guide seat 6 and the second synchronous runner 5 rotate, the lead screw slide 7 and the acoustic detector 8 flip to the position directly below the gas detector 3. Subsequently. The acoustic detector 8 moves horizontally along the distribution direction of the connecting rod 2 to find the specific leakage point.

[0040] Embodiment 2: As Figure 5 , Figure 8As shown, second connecting rods 43 extending outward are provided on both the first synchronous runner 4 and the second synchronous runner 5, and positioning disks 16 are fixed to the ends of the symmetrically distributed second connecting rods 43. Therefore, when the first synchronous runner 4 and the second synchronous runner 5 rotate, under the connection of the second connecting rods 43, the positioning disks 16 rotate synchronously.

[0041] A same driving shaft 9 is provided at the center of each of the two positioning disks 16, and a first driving motor 17 for controlling the rotation of the driving shaft 9 is provided outside one of the positioning disks 16. Two power gear disks 10 are installed on the driving shaft 9 and distributed from left to right. Three guiding gear disks 11 are meshed and connected to the outside of each power gear disk 10. The three groups of guiding gear disks 11 are respectively installed on three positioning rods 12, and both ends of the three positioning rods 12 are installed on the positioning disks 16. Before the positioning disks 16 carry the positioning rods 12 to rotate, under the power of the first driving motor 17, the power gear disks 10 drive the guiding gear disks 11 to rotate, and the three positioning rods 12 all rotate in the same direction, so that the frames of the first turning frame 13 and the second turning frame 14 all rotate towards the outside of the circular track where the three positioning rods 12 are located. The first turning frame 13 and the second turning frame 14 are exposed.

[0042] Therefore, during the rotation of the three positioning rods 12 and the first turning frame 13, the second turning frame 14 and the pushing frame 15 connected thereto along with the positioning disks 16, the second turning frame 14 and the first turning frame 13 can successively contact the ground, so as to achieve the purpose of turning the surface soil of the ground. See Figure 6 shown.

[0043] After the second turning frame 14 and the first turning frame 13 turn the surface soil of the ground and the detection work of the acoustic detector 8 is completed, the three positioning rods 12 and the first turning frame 13, the second turning frame 14 and the pushing frame 15 connected thereto rotate and reset along with the positioning disks 16, and the acoustic detector 8 also rotates and resets accordingly. Before resetting, the first driving motor 17 needs to drive the power gear disks 10 to drive the guiding gear disks 11 to rotate again, so that the three positioning rods 12 rotate in the same direction again, so as to achieve the purpose of driving the frames of the first turning frame 13 and the second turning frame 14 to rotate towards the inside of the circular track where the three positioning rods 12 are located, so that the frames of the first turning frame 13 and the second turning frame 14 return to their original positions. See Figure 2 shown.

[0044] After the frames of 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 rotation of the positioning plate 16, thereby avoiding secondary damage to the soil layer. At the same time, part of the soil that has been pried away to the original position can also be pushed back during the resetting process of the first turning frame 13 and the second turning frame 14, 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 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 rod 12. The frame bodies are both composed of a straight plate portion connected to the positioning rod 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 contact the muddy ground in turn, the arc plate part 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 Therefore, when the second turning frame 14 and the first turning frame 13 contact the muddy ground in sequence, the protruding portion of the push-back frame 15 does not contact the muddy ground. When the positioning plate 16 carries the positioning rod 12 and the second turning frame 14 and the first turning frame 13 are reset to their original positions, the protruding portion of the push-back frame 15 can be gradually moved away from the driving shaft 9 because the frame bodies of the second turning frame 14 and the first turning frame 13 have returned to their original positions.

[0048] After the specific leakage point of the pipeline is determined, during the process of the first turning frame 13, the second turning frame 14 and the pushing-back frame 15 rotating and resetting along with the positioning disc 16, the first turning frame 13 and the second turning frame 14 in the retracted state can push the upturned part of the soil back to its original position, and the protruding part of the pushing-back frame 15 following closely behind can flatten the turned soil comprehensively, having a good leveling effect on the ground, effectively avoiding an increase in the gas spillage amount, and having a protective effect on the ground.

[0049] Embodiment 3: As Figure 8 , Figure 9 shown, outside the motor frame 1, there is a driving gear 18 coaxially distributed with the synchronous gear 41. The driving gear 18 and the synchronous gear 41 are connected by the same synchronous shaft 19, and outside the motor frame 1, there is a second driving motor 20 that can control the rotation of the synchronous shaft 19. When the second driving motor 20 operates, under the driving force of the driving gear 18 and the synchronous gear 41, the first synchronous runner 4 and the second synchronous runner 5 can rotate synchronously to achieve the purpose of driving the acoustic detector 8 to flip its position.

[0050] On the basis of Embodiment 2, during the process that the second turning frame 14 and the first turning frame 13 successively contact the ground and turn the surface soil of the ground, it is actually moving towards the rear of the gas detector 3. During the turning process, due to the acting force exerted by the first turning frame 13 and the second turning frame 14 on the ground, the entire device is prone to tipping forward, affecting the stability during the operation of the device.

[0051] In the present invention, as Figure 8 , Figure 9 shown, both sides of the motor frame 1 are provided with movable support seats 21. 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 on the same side as the driving gear 18 is meshed and connected to the lower part directly below the driving gear 18 through a rack. Outside the motor frame 1 and near the lower part, there are guide rails 24 adapted to the movement tracks of the support seats 21. When the driving gear 18 rotates, the two support seats 21 and the connecting plate 23 move towards the front of the motor frame 1.

[0052] After the two support seats 21 and the connecting plate 23 move towards the front of the motor frame 1, if the entire device tips forward, the support seats 21 will also tilt and abut against the ground, having a supporting effect on the device, avoiding the tipping phenomenon of the device, and maintaining the stability of the entire device during the operation process.

[0053] As Figure 8 , Figure 9As shown in the figure, the bottom ends of the support bases 21 are fixedly connected with support feet 22, and the support feet 22 are all triangular structures. When the support bases 21 move forward towards the front of the motor frame 1, the support feet 22 gradually expose from the outside of the motor frame 1 to the front of the motor frame 1. The setting of the support feet 22 improves the stability of the support bases 21. When the whole device topples forward, the support feet 22 can quickly abut against the ground and intercept the forward toppling of the device in time, further ensuring the stable state of the whole device.

[0054] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An underground pipeline leakage detection device, comprising symmetrically distributed motor frames (1) and a connecting rod (2) arranged inside the motor frame (1). A gas detector (3) for monitoring leakage gas is fixedly installed at the center of the connecting rod (2), and it is characterized in that: Above the gas detector (3), there is a rotatable lead screw slide (7) provided with an acoustic detector (8) thereon. When the lead screw slide (7) and the acoustic detector (8) are flipped below the gas detector (3), the acoustic detector (8) moves horizontally to search for gas leakage points in the pipeline. In front of the gas detector (3), there are three positioning rods (12) that can rotate synchronously with the acoustic detector (8). The three positioning rods (12) are equidistantly arranged along a circular trajectory, and a first turning frame (13), a second turning frame (14), and a pushing-back frame (15) that can rotate synchronously are respectively fixed on the three positioning rods (12). The second turning frame (14) and the pushing-back frame (15) are distributed lower, and the first turning frame (13) is located above the second turning frame (14) and the pushing-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) successively contact the ground to turn over the surface soil of the ground.

2. The underground pipeline leakage detection device according to claim 1, characterized in that: At both ends of the connecting rod (2), there are respectively a first synchronous runner (4) and a second synchronous runner (5). A toothed ring is fixed on the outer circumference of the first synchronous runner (4), and a synchronous gear (41) meshing with the toothed ring is provided inside the motor frame (1). Both the first synchronous runner (4) and the second synchronous runner (5) are connected to the same guide seat (6) through a first connecting rod (42). The lead screw slide (7) is installed on the guide seat (6). When the synchronous gear (41) meshes with the first synchronous runner (4), the guide seat (6), and the second synchronous runner (5) to rotate, the lead screw slide (7) and the acoustic detector (8) change their positions.

3. The underground pipeline leakage detection device according to claim 2, wherein: On both the first synchronous runner (4) and the second synchronous runner (5), there are second connecting rods (43) extending outwards. The ends of the symmetrically distributed second connecting rods (43) are both fixed with positioning disks (16). A driving shaft (9) is provided at the center of both positioning disks (16). A driving motor one (17) for controlling the rotation of the driving shaft (9) is provided outside one of the positioning disks (16). On the driving shaft (9), there are two power gear disks (10) distributed from left to right. Three guiding gear disks (11) are meshed and connected outside each power gear disk (10). The three groups of guiding gear disks (11) are respectively installed on the three positioning rods (12). Both ends of the three positioning rods (12) are installed on the positioning disks (16). When the power gear disks (10) mesh with the guiding gear disks (11) to rotate, the three positioning rods (12) all rotate in the same direction.

4. The underground pipeline leakage detection device according to claim 3, characterized in that: Both the first turning frame (13) and the second turning frame (14) are composed of multiple equally spaced frames, and the frames in the first turning frame (13) and the second turning frame (14) are staggered along the distribution direction of the positioning rods (12). The frames are composed of a straight plate part connected to the positioning rods (12) and an arc plate part formed by bending the straight plate part. When the positioning rods (12) rotate, the frames of the first turning frame (13) and the second turning frame (14) all rotate towards the outside of the circular trajectory where the three positioning rods (12) are located.

5. The underground pipeline leakage detection device according to claim 3, characterized in that: The backward pushing frame (15) is in a semi-cam structure. When the first turning frame (13) and the second turning frame (14) rotate towards the outer side of the circumferential track where the three positioning rods (12) are located, the protruding part of the backward pushing frame (15) gradually moves towards the direction of the drive shaft (9).

6. The underground pipeline leakage detection device according to claim 1, characterized in that: A drive gear (18) coaxial with the synchronous gear (41) is arranged outside the motor frame (1). The drive gear (18) and the synchronous gear (41) are connected by the same synchronous shaft (19). A second drive motor (20) capable of controlling the rotation of the synchronous shaft (19) is arranged outside the motor frame (1).

7. The underground pipeline leakage detection device according to claim 6, characterized in that: Movable support seats (21) are arranged on both sides of the motor frame (1). 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) on the same side as the drive gear (18) is meshed with the drive gear (18) through a rack and is located directly below the drive gear (18). Guide rails (24) adapted to the movement tracks of the support seats (21) are arranged on the outer side and near the bottom of the motor frame (1). When the drive gear (18) rotates, the two support seats (21) and the connecting plate (23) move towards the front of the motor frame (1).

8. The underground pipeline leakage detection device according to claim 7, wherein: The bottom ends of the support seats (21) are fixedly connected with support feet (22). The support feet (22) are all in a triangular structure. When the support seats (21) move towards the front of the motor frame (1), the support feet (22) gradually expose from the outside of the motor frame (1) to the front of the motor frame (1).

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