Urban underground pipe network safety detection device

Abstract

The application relates to the field of pipe network detection technology, in particular to a kind of urban underground pipe network safety detection equipment, it includes frame and two walking mechanisms, the frame is provided with detector for detecting combustible gas;Walking mechanism, including rotationally connected to the roller of frame, spiral blade is arranged in the outer wall of roller and the driving member for driving roller rotation, the inside of the roller is hollow, the driving member is arranged in the frame, and two the roller is parallel to each other;The frame is provided with a retaining assembly so that the detector remains upward, and the projection of the detector and the frame along the distribution direction of two rollers is located on the inside of the roller.This application reduces the water flow impact resistance during driving while maintaining the stability of the progress.

Description

Technical Field

[0001] This application relates to the field of pipeline network inspection technology, and in particular to a safety inspection device for urban underground pipeline networks. Background Technology

[0002] Urban underground pipe networks refer to the pipelines and ancillary facilities within a city for water supply, drainage, gas, heating, electricity, communications, broadcasting and television, and industry. They are vital infrastructure and the "lifeline" for ensuring the operation of a city. With urban development and increased population density, the drainage volume of urban underground pipe networks is growing larger and larger. Furthermore, since underground pipe networks primarily discharge domestic sewage, they often produce flammable gases, such as methane, due to fermentation and other reasons, which can easily lead to pipeline explosions.

[0003] Especially in current urban construction, underground pipe networks are often constructed using utility tunnels, which typically house water supply, drainage, electricity, and communication lines. If the concentration of flammable gases within these tunnels is relatively high, it poses a significant safety hazard. Therefore, to conduct safety inspections of pipe networks, current technologies often employ mobile devices carrying detection equipment to monitor the flammable gases within the network.

[0004] In existing technologies, walking devices for pipelines often employ multiple circumferentially arranged wheeled or tracked walking mechanisms. These mechanisms abut against the inner wall of the pipeline, allowing the detection equipment to move within the pipe. However, during combustible gas detection, pipelines often contain significant amounts of water and debris. This causes considerable impact from the water flow on both the walking device and the detection equipment, significantly increasing walking resistance. While propeller propulsion can reduce the impact of the water flow, it can easily lead to grounding in areas with low water flow, affecting the safe inspection of underground pipe networks. Therefore, how to reduce water flow impact resistance while still navigating both high-water and low-water areas within the pipeline is a pressing technical problem that needs to be solved. Summary of the Invention

[0005] In order to reduce the impact of water flow during driving and optimize the passability during driving, this application provides a safety inspection device for urban underground pipe networks.

[0006] This application provides a safety detection device for urban underground pipeline networks, which adopts the following technical solution:

[0007] A safety inspection device for urban underground pipeline networks includes a frame and two traveling mechanisms. The frame is equipped with a detector for detecting combustible gases. The traveling mechanism includes a roller rotatably connected to the frame, helical blades arranged circumferentially on the outer wall of the roller, and a drive component for driving the roller to rotate. The roller is hollow inside. The drive component is located on the frame, and the two rollers are parallel to each other. The frame is equipped with a holding component that keeps the detector facing upwards, and the projections of the detector and the frame along the distribution direction of the two rollers are located on the inner side of the rollers.

[0008] By adopting the above technical solution, when traveling through underground pipelines, the driving component drives two rollers to rotate. At this time, the helical blades will rotate with the connected rollers. When the circumferential rotation of the helical blades comes into contact with water or the inner wall of the pipeline, it can generate thrust along the axial direction of the rollers. This enables travel in areas with relatively high water flow and areas without water in the pipeline. Furthermore, the difference in rotational speed between the two rollers can be used to achieve turning or turning around, thereby optimizing the passage through the pipeline. Compared with traveling by multiple walking mechanisms against the inner wall of the pipeline, this method can effectively reduce the contact area with the water flow, thereby reducing the impact of the water flow and reducing the space occupied inside the pipeline.

[0009] Optionally, both the roller and the helical blades are made of a flexible material, and the roller has a closed structure.

[0010] By adopting the above technical solution, the spiral blades can be locally elastically bent when they come into contact with the inner wall of the pipe, thereby reducing the possibility of damage to the inner wall of the pipe caused by the rotation of the spiral blades.

[0011] Optionally, the roller has multiple mutually separated floating cavities formed inside.

[0012] By adopting the above technical solution, multiple mutually separated floating cavities can provide auxiliary support to the outer wall of the roller through the cavity walls of adjacent floating cavities, thereby reducing the possibility that the helical blades cannot generate sufficient thrust due to local deformation of the roller. At the same time, multiple separately arranged floating cavities can reduce the possibility that the roller's buoyancy will disappear due to local damage to the roller.

[0013] Optionally, the roller expansion molding has at least two axially distributed floating portions, and part of the floating cavity is formed inside the floating portions.

[0014] By adopting the above technical solution, at least two floating parts on the roller are expanded and molded, so that the buoyancy of the floating parts in the water flow is greater than that of the parts outside the floating parts. This allows the frame to have a multi-point support effect when the load is applied to the roller, thereby optimizing the stability during use. At the same time, when traveling in a waterless area, the spiral blades of the floating parts can also abut against the inner wall of the pipe. Compared with a cylindrical roller, this provides a relatively stable multi-point support between the frame and the inner wall of the pipe, thereby effectively optimizing the stability of travel in a waterless area.

[0015] Optionally, the driving component includes a drive shaft rotatably connected to the frame and a drive motor for driving the drive shaft to rotate. The drive shaft is coaxially inserted through the roller, and the drive shaft is provided with a plurality of fasteners for fixing the roller.

[0016] By adopting the above technical solution, during movement, only the drive motor needs to drive the drive shaft to rotate, and the rotating drive shaft, in conjunction with the fasteners, will drive the roller to rotate.

[0017] Optionally, the roller has several fastening holes corresponding to the fastener forming. The fastener includes a pad tube, a fastening tube, and a fastening bolt. The inner wall of the pad tube has a stepped shaft structure and the small end faces the drive shaft opening. The pad tube passes through the fastening hole and is fixedly connected to the roller. The fastening tube is located inside the pad tube and is fixedly connected to the drive shaft. The fastening bolt is threaded to the fastening tube and the bolt head abuts against the stepped surface of the pad tube. The pad tube has a tendency to elastically deform under external force.

[0018] By adopting the above technical solution, the pad tube can, together with the fastening tube and fastening bolt, restrict the relative rotation between the roller and the drive shaft when the drive shaft rotates; at the same time, the pad tube and fastening bolt act as intermediate buffers, reducing the possibility of damage to the roller caused by the impact force generated by the start of the drive motor.

[0019] Optionally, the retaining assembly includes a retaining ring rotatably mounted on the frame and a counterweight block disposed at the bottom of the retaining ring. The two ends of the retaining ring are closed structures in the axial direction, and the detector is installed inside the retaining ring. The detection end of the detector extends out of the retaining ring from the end away from the counterweight block and is used to detect combustible gas.

[0020] By adopting the above technical solution, whether in water or in a waterless area, the end of the retaining ring away from the counterweight can always be kept facing upwards under the action of the counterweight. Furthermore, since the retaining ring has a ring-shaped structure, the resistance of the water flow to the rotation of the retaining ring can be reduced when it is in water.

[0021] Optionally, the rotation plane of the retaining ring is perpendicular to the length direction of the roller, and the retaining ring includes a retaining ring body and a floating chamber that is slidably disposed relative to the retaining ring body. The outer walls of the retaining ring body and the floating chamber are annular. The counterweight is installed on the inner side of the retaining ring body. The floating chamber has a hollow structure and the detector is installed on the inner side of the floating chamber.

[0022] By adopting the above technical solution, in areas with relatively high water flow, the floating chamber will float up under the action of buoyancy, thereby reducing the possibility that the detection end of the detector will be submerged in water due to excessive water flow and thus be unable to perform detection.

[0023] Optionally, the two ends of the retaining ring body along the roller axis are rotatably connected to the frame through isolation rollers. The ends of the two isolation rollers that are far apart have a spherical or conical tube structure, and the isolation rollers are hollow inside and fixedly connected to the frame.

[0024] By adopting the above technical solution, the isolation roller can further reduce the contact area between the retaining ring body and the water, thereby further reducing the resistance when the retaining ring body rotates; at the same time, it can also guide the water flow at both ends of the retaining ring body in the axial direction.

[0025] Optionally, both the floating chamber and the retaining ring body are provided with a limiting hole. The inner wall of the limiting hole has a stepped shaft structure, and the small ends of the limiting holes on the floating chamber and the retaining ring body are arranged facing each other. A limiting rod passes through the limiting hole, and the two ends of the limiting rod abut against the stepped surfaces of the limiting holes on the floating chamber and the retaining ring body, respectively.

[0026] By adopting the above technical solution, the limiting rod can restrict the slippage of the floating container, thereby reducing the possibility of the floating container detaching from the main body of the retaining ring.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] When traveling through underground pipelines, the drive mechanism rotates two rollers, which in turn rotate the helical blades. The circumferential rotation of the helical blades generates thrust along the axial direction of the rollers when they come into contact with water or the inner wall of the pipeline. This allows the helical blades to travel in areas with relatively high water flow and in areas without water within the pipeline. Furthermore, the difference in rotational speed between the two rollers allows for turning or reversing, optimizing the passage through the pipeline. Compared to traveling by multiple walking mechanisms that abut against the inner wall of the pipeline, this method effectively reduces the contact area with the water flow, thereby reducing the impact of the water flow and minimizing the space occupied within the pipeline. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0030] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along line AA.

[0031] Figure 3 yes Figure 2 A magnified structural diagram of part B.

[0032] Figure 4 This is a cross-sectional view of the retaining component in an embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Detector; 2. Traveling mechanism; 21. Roller; 211. Floating chamber; 212. Fastening hole; 213. Floating part; 22. Spiral blade; 23. Drive component; 231. Drive shaft; 232. Drive motor; 24. Fastener; 241. Pad; 242. Fastening tube; 243. Fastening bolt; 244. Sealing block; 4. Holding assembly; 41. Holding ring; 411. Holding ring body; 412. Floating chamber; 413. Restriction hole; 414. Restriction rod; 42. Counterweight; 43. Isolation roller. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0035] This application discloses a safety inspection device for urban underground pipeline networks. (Refer to...) Figure 1 and Figure 2 The urban underground pipeline safety inspection equipment includes a frame 1 and two traveling mechanisms 2. The frame 1 has a truss-like structure, and a detector 11 is connected to the frame 1 via a retaining assembly 4. This ensures that the detector 11's detection end is always facing upwards while detecting combustible gases, reducing the impact of water in the underground pipeline on the detector 11's detection of combustible gases. The retaining assembly 4 is located inside the two traveling mechanisms 2.

[0036] Reference Figure 1 and Figure 2Specifically, the traveling mechanism 2 includes a roller 21, spiral blades 22 arranged circumferentially on the outer wall of the roller 21, and a driving component 23 for driving the roller 21 to rotate. The roller 21 is hollow inside, so that the two rollers 21 can float in the water and float the frame 1, the detector 11, and the holding assembly 4 as a whole. This allows the detector 11 to still detect combustible gases in the pipe even when there is a relatively large amount of water in the pipe. The spiral blades 22 on the two rollers 21 are arranged in opposite spiral directions, so that the spiral blades 22 can contact the ground or the water flow in the pipe. The spiral blades 22 follow the rotation of the roller 21 and push the water flow in the ground or pipe to generate thrust, so that the frame 1 and the holding assembly 4 can move in the water flow in the pipe, on dry surfaces, or in silt areas. In addition, in order to reduce the possibility of damage to the detector 11 due to its protrusion, the projection of the detector 11 and the frame 1 along the distribution direction of the two rollers 21 is located inside the projection of the rollers 21, so as to reduce the possibility of debris in the pipe and the pipe directly contacting the detector 11.

[0037] In use, if encountering an area with relatively strong water flow, the two rollers 21 provide buoyancy to the frame 1, allowing both the detector 11 and the frame 1 to float on the water surface. The retaining component 4 keeps the detection end of the detector 11 facing upwards, ensuring that detection can still be performed even in areas with strong water flow. The two rollers 21 also provide lateral protection for the detector 11. Furthermore, during this process, the drive component 23 rotates the rollers 21, causing the two spiral blades 22 to generate thrust through contact with the water flow, propelling the entire frame 1 forward.

[0038] When encountering areas with relatively small water flow or no water, the spiral blades 22 will directly contact the ground. As the rollers 21 rotate, the spiral blades 22 will also generate axial thrust between themselves and the ground, thus driving the frame 1 forward.

[0039] Reference Figure 1 and Figure 2 Specifically, since the water flow in underground pipes is relatively low, the spiral blade 22 will directly abut against the inner wall of the pipe. Since the pipes are mostly made of metal, rubber or concrete, in order to reduce the possibility of the spiral blade 22 causing damage to the inner wall of the pipe, both the spiral blade 22 and the roller 21 are made of flexible materials, such as rubber, silicone and alloy materials covered with rubber or silicone.

[0040] Meanwhile, in order to optimize the overall stability of the frame 1 when traveling in water, the outer wall of the roller 21 is expanded to form at least two floating parts 213 distributed along the axial direction of the roller 21 itself. The floating parts 213 are ellipsoidal, and in this embodiment, two floating parts 213 are formed on the roller 21 so that when traveling in water, the buoyancy of the corresponding part of the floating part 213 is greater than the buoyancy of other parts of the roller 21. When the buoyancy of the floating part 213 is transmitted to the frame 1, it can form multiple support points for the frame 1 to reduce the possibility of overturning.

[0041] Furthermore, the roller 21 has multiple mutually separated floating cavities 211 formed inside, and the roller 21 has a closed structure to reduce the possibility of insufficient buoyancy and unusability of the roller 21 due to local damage. At the same time, the cavity walls formed between the multiple floating cavities 211 can also help to enhance the overall strength of the roller 21 and optimize its resistance to deformation.

[0042] Reference Figure 1 and Figure 2 The driving component 23 includes a drive shaft 231 and a drive motor 232. The drive shaft 231 is coaxially inserted and fixedly connected to the roller 21, and is separated from the interior of the floating cavity 211. Both ends of the drive shaft 231 are rotatably connected to the frame 1, and the two drive shafts 231 are parallel to each other. The housing of the drive motor 232 is fixedly connected to the frame 1, and the output shaft of the drive motor 232 is fixedly connected to the drive shaft 231 via a coupling or directly coaxially, for driving the drive shaft 231 to rotate.

[0043] Reference Figure 2 and Figure 3 Meanwhile, since the roller 21 is made of elastic material and has a certain margin for elastic deformation, in order to detachably connect the roller 21 to the drive shaft 231 and reduce the tendency of relative rotation between the roller 21 and the drive shaft 231, a number of fasteners 24 are provided on the drive shaft 231.

[0044] The roller 21 has multiple fastening holes 212, which extend radially along the drive shaft 231 and are separated from the floating cavity 211. The fastening holes 212 also connect the inner and outer sides of the roller 21 corresponding to the drive shaft 231. Fasteners 24 are provided one-to-one with the fastening holes 212. Each fastener 24 includes a pad tube 241, a fastening tube 242, and a fastening bolt 243. The outer wall of the pad tube 241 is attached to and connected to the inner wall of the fastening hole 212 by a fixing beam. The pad tube 241 is coaxially sleeved on the fastening tube 242, and the fastening tube 242 is fixedly connected to the drive shaft 231.

[0045] Furthermore, the pad tube 241 is made of an elastic material, enabling it to elastically deform under external force. The inner wall of the pad tube 241 has a stepped shaft structure with the smaller end facing the drive shaft 231. A fastening bolt 243 passes through the pad tube 241 and is threaded to the fastening tube 242, with the bolt head abutting against the stepped surface of the pad tube 241. This secures the pad tube 241 to the drive shaft 231 and acts as a buffer, reducing the possibility of damage to the roller 21 caused by power transmission. Simultaneously, a sealing block 244 is threaded to the larger end of the pad tube 241. The end of the sealing block 244 furthest from the drive shaft 231 is flush with the outer wall of the roller 21, reducing the possibility of debris adhering inside the roller 21. Furthermore, the strength of the threaded connection of the sealing block 244 to the large end of the pad tube 241 is greater than the strength of the portion of the sealing block 244 located on the outside of the pad tube 241, so as to optimize the connection strength of the sealing block 244 and reduce the possibility of the sealing block 244 detaching due to external impact; at the same time, it can also adapt to the external deformation of the roller 21 with relatively small external strength.

[0046] Reference Figure 1 and Figure 4 The retaining assembly 4 includes a retaining ring 41 and a counterweight 42. The central axis of the retaining ring 41 is parallel to the central axis of the roller 21. Isolation rollers 43 are respectively provided at both ends of the retaining ring 41 along the axial direction. The isolation rollers 43 are fixedly connected to the frame 1, and the two ends of the isolation rollers 43 are rotatably connected to each other, so that the retaining ring 41 is rotatably connected to the frame 1 through the isolation rollers 43, and the rotation plane of the retaining ring 41 is perpendicular to the axial direction of the roller 21. The ends of the two isolation rollers 43 that are far apart are respectively spherical or conical, and smoothly transition to the outer wall of the retaining ring 41 to reduce the resistance of water flow during movement. Simultaneously, the interior of the isolation rollers 43 is hollow to assist in applying buoyancy to the frame 1.

[0047] Reference Figure 1 and Figure 4 The retaining ring 41 includes a retaining ring body 411 and a floating chamber 412 that is radially slidably connected to the retaining ring body 411. The two ends of the retaining ring body 411 along the axial direction of the roller 21 are respectively rotatably connected to the opposing ends of two isolation rollers 43. At the same time, a counterweight 42 is fixedly connected to the inner side of the end of the retaining ring body 411 away from the floating chamber 412, so that under the action of the counterweight 42, the floating chamber 412 can be kept in a state above the retaining ring body 411.

[0048] Specifically, when the floating chamber 412 is attached to the retaining ring body 411, the outer wall of the floating chamber 412 along the circumferential direction of the isolation roller 43 and the side wall of the retaining ring body 411 along the circumferential direction of the isolation roller 43 form a smooth transition and are circular. Simultaneously, the interior of the floating chamber 412 is a hollow, closed structure, and the detector 11 is installed inside the floating chamber 412. The detection end of the detector 11 extends from the top of the floating chamber 412 for detection, and the detection end of the detector 11 is kept facing upwards while performing the detection. Furthermore, because the floating chamber 412 is a hollow, closed structure, it can float promptly under buoyancy when there is relatively abundant rainwater and the spiral blade 22 is in contact with the top of the pipe or when there are waves. This reduces the impact of sewage from the underground pipe network on the detector 11. Additionally, the downward gravity of the counterweight 42, combined with the buoyancy of the floating chamber 412, further optimizes the stability of keeping the detector 11 in an upward-facing state.

[0049] Of course, in other embodiments, the retaining component 4 can also be configured such that the detector 11 is fixedly connected to the bottom of the retaining ring 41, and the detection end of the detector 11 is equipped with a floating chamber, which is filled with a light gas, such as helium, so that the floating chamber can apply an upward buoyancy to the detector 11, and at the same time, in conjunction with the weight of the detector 11 itself, the detection end of the detector 11 can be kept in an upward state.

[0050] Reference Figure 4 Furthermore, in order to allow the floating chamber 412 to slide relative to the retaining ring body 411 while limiting the floating stroke of the floating chamber 412, both the floating chamber 412 and the retaining ring body 411 are provided with limiting holes 413. The inner wall of the limiting hole 413 has a stepped shaft structure, and the small ends of the limiting holes 413 on the floating chamber 412 and the retaining ring body 411 are arranged to face each other. At the same time, at least one limiting rod 414 located inside the limiting hole 413 is provided in both the floating chamber 412 and the retaining ring body 411. That is, the limiting rod 414 is provided in both the retaining ring body 411 and the limiting hole 413 on the floating chamber 412. The two ends of the limiting rod 414 are bent or protruding, and the protruding parts of the two ends of the limiting rod 414 abut against the stepped surface of the limiting hole 413 on the floating chamber 412 and the retaining ring body 411. This is used to limit the sliding stroke of the floating chamber 412 while guiding and transmitting power to the floating chamber 412.

[0051] The implementation principle of this application embodiment is as follows: During use, whether the two rollers 21 are in contact with water flow or the inner wall of the pipe, they can generate thrust through the spiral blades 22 to adapt to the parts of the underground pipe with relatively more water flow and the areas without water, and drive the frame 1 to move forward. At the same time, the difference in rotation speed between the two rollers 21 can also be used to achieve turning and turning around; at the same time, when encountering relatively more water flow or when the frame 1 is overturned, the counterweight 42 can make the retaining ring body 411 rotate, so that the floating chamber 412 is kept in an upward state. At the same time, the floating chamber 412 can also float during the process of water immersion, so as to keep the detection end of the detector 11 always above the water surface before the pipe is filled with water.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A safety detection device for urban underground pipe network, characterized in that: The utility model relates to a kind of combustible gas detection vehicle, including rack (1) and two walking mechanisms (2), the rack (1) is provided with detector (11) for detecting combustible gas; Walking mechanism (2), including roll (21) rotationally connected to rack (1), spiral blade (22) is arranged in the ring direction to the outer wall of roll (21) and drive member (23) for driving roll (21) rotation, the inside of roll (21) is hollowly arranged, the drive member (23) is arranged in rack (1), and the two roll (21) is parallel to each other; The rack (1) is provided with a retaining assembly (4) that keeps the detector (11) pointing upwards, and the projection of the detector (11) and the rack (1) along the distribution direction of the two rollers (21) is located inside the roller (21); The inside of the roller (21) is shaped with a plurality of mutually separated floating cavities (211); The drive member (23) includes a drive shaft (231) rotationally connected to the rack (1) and a drive motor (232) for driving the drive shaft (231) to rotate, the drive shaft (231) is coaxially arranged in the roller (21), and the drive shaft (231) is provided with a plurality of fastening members (24) for fixing the roller (21); The roller (21) is shaped with a plurality of fastening holes (212) corresponding to the fastening members (24), the fastening member (24) includes a spacer tube (241), a fastening tube (242), and a fastening bolt (243), the inner wall of the spacer tube (241) is in a stepped shaft structure with the small end opening towards the drive shaft (231), the spacer tube (241) is arranged in the fastening hole (212) and fixedly connected to the roller (21), the fastening tube (242) is located inside the spacer tube (241) and fixedly connected to the drive shaft (231), the fastening bolt (243) is threadedly connected to the fastening tube (242) with the threaded end abutting against the stepped surface of the spacer tube (241), and the spacer tube (241) has a tendency to elastically deform under external force.

2. The urban underground pipe network safety detection device according to claim 1, characterized in that: The roller (21) and the spiral blade (22) are made of a material that can elastically bend, and the roller (21) is in a closed structure.

3. The urban underground pipe network safety detection device according to claim 1, characterized in that: The roller (21) is expandingly shaped with at least two floating portions (213) distributed in the axial direction, and part of the floating cavities (211) are shaped inside the floating portions (213).

4. The urban underground pipe network safety detection device according to claim 1, characterized in that: The retaining assembly (4) includes a retaining ring (41) rotationally arranged in the rack (1) and a counterweight (42) arranged at the bottom of the retaining ring (41), both ends of the retaining ring (41) in the axial direction are in a closed structure, and the detector (11) is installed inside the retaining ring (41), the detection end of the detector (11) extends out of the retaining ring (41) and is used for detecting combustible gas away from one end of the retaining ring (41) away from the counterweight (42).

5. The urban underground pipe network safety detection device according to claim 4, characterized in that: The rotation plane of the retaining ring (41) is perpendicular to the length direction of the roller (21), and the retaining ring (41) comprises a retaining ring body (411) and a floating bin (412) slidingly arranged opposite to the retaining ring body (411), the annular outer side walls of the retaining ring body (411) and the floating bin (412) are annular, the counterweight (42) is mounted on the inner side of the retaining ring body (411), the floating bin (412) is in a hollow structure and the detector (11) is mounted on the inner side of the floating bin (412).

6. The urban underground pipe network safety detection device according to claim 5, characterized in that: The retaining ring body (411) is rotationally connected to the rack (1) through the isolation roller (43) at both ends in the axial direction of the roller (21), the distal end of the two isolation rollers (43) is in a spherical or conical tube structure, and the isolation roller (43) is hollow and fixedly connected to the rack (1) inside.

7. The urban underground pipe network safety detection device according to claim 6, characterized in that: The floating bin (412) and the retaining ring body (411) are both provided with a limiting hole (413), the inner wall of the limiting hole (413) is in a stepped shaft structure, the small end of the limiting hole (413) on the floating bin (412) and the retaining ring body (411) is oppositely arranged, the limiting hole (413) is provided with a limiting rod (414), and the two ends of the limiting rod (414) abut against the stepped faces of the limiting hole (413) on the floating bin (412) and the retaining ring body (411).

Images