A radar positioning auxiliary device for detecting a cavity around a pipe network

Abstract

The utility model provides a kind of radar positioning auxiliary device of pipe network pipe peripheral cavity detection, it is related to pipe network pipe peripheral cavity detection technical field, including built-in shaft, built-in shaft is used to move along the direction of pipeline layout and built-in shaft surface rotation is connected with the rotation pipe of coaxial distribution, several mounting brackets are fixedly installed in the lateral wall of rotation pipe along center axis direction, the side fixedly installed with fixed shield ring in the back of mounting bracket, built-in shaft surface is provided with rotation pipe, different frequency antenna rotation is realized by using rotation pipe rotation, and it is detected to the cavity around pipeline to realize one circle, so that antenna can omnidirectionally emit electromagnetic wave from pipeline, avoid the detection blind area caused by the directionality of geological body distribution, in the process of rotation, the reflection signal of same cavity under different angles can be cross-verified, false reflection caused by uneven soil is removed by signal consistency analysis, improve the reliability of cavity identification.

Description

Technical Field

[0001] This utility model relates to the field of pipeline periphery cavity detection technology, and in particular to a radar positioning auxiliary device for detecting pipeline periphery cavities. Background Technology

[0002] The pressure of the underground soil can be concentrated on the pipe walls due to the "vacancy effect" of pores, which can easily lead to pipe cracking, deformation, or even collapse over time. Especially for pipelines carrying hazardous media such as gas and high-pressure water, leaks caused by pores can lead to major safety accidents such as explosions and water pollution. By accurately detecting the location, size, and shape of pores using radar, repair measures such as grouting and pipe reinforcement can be taken in advance to prevent pipeline failure from the source and ensure the safe operation of urban infrastructure.

[0003] However, uneven moisture content and density of underground soil, or the presence of complex geological bodies such as rocks and gravel, can lead to unstable electromagnetic wave propagation speed and increased signal attenuation, affecting the accurate judgment of the boundary and size of cavities. In addition, soils with high conductivity (such as saline-alkali land) can significantly weaken the penetrating power of electromagnetic waves, making it impossible to effectively detect deep cavities around pipes. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a radar positioning auxiliary device for detecting voids around pipe networks.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a radar positioning auxiliary device for detecting cavities around pipe networks, comprising an internal shaft, the internal shaft being movable along the pipe laying direction and having coaxially distributed rotating pipes rotatably connected to its surface, a plurality of mounting brackets being fixedly installed on the outer wall of the rotating pipes along the central axis, a fixed shielding ring being fixedly installed on the side of the mounting brackets facing away from the rotating pipes, antennas of different frequencies being fixedly installed in the plurality of fixed shielding rings respectively, and a movable shielding ring being sleeved outside each fixed shielding ring, a cavity being opened in the internal shaft near each mounting bracket, a control device being fixedly installed in the cavity, and a control line passing through the cavity wall and the rotating pipe surface being connected to the antenna on the adjacent mounting bracket, the control device being signal-connected to the antenna on the adjacent mounting bracket, the control line being fixedly installed at the top and bottom of the cavity, the spring rods at the top and bottom of the cavity being staggered, the control line being in a zigzag shape in the cavity and passing sequentially through the telescopic ends of the plurality of spring rods in the same cavity.

[0006] Preferably, an internal gear ring is fixedly installed on the inner wall of the rotating tube and is rotatably connected to and coaxially distributed with the surface of the built-in shaft. An internal gear is embedded inside the built-in shaft and is driven by a motor and meshes with the internal gear ring.

[0007] Preferably, an electric push rod is fixedly installed on the mounting bracket, which is parallel to the central axis of the fixed shielding ring. The telescopic end of the electric push rod points to the bottom end of the movable shielding ring and is connected to the bottom edge of the movable shielding ring by bolts.

[0008] Preferably, several rotating seats are slidably mounted on both ends of the built-in shaft, and an electric telescopic rod that swings relative to the central axis of the built-in shaft is hinged to the rotating seat. An electric wheel for rolling connection with the inner wall of the pipe is installed at the telescopic end of the electric telescopic rod.

[0009] Preferably, the inner shaft is provided with a plurality of external toothed rings at both ends, the number of rotating seats at the same end of the inner shaft is the same as the number of external toothed rings, and the plurality of external toothed rings are coaxial and arranged along the central axis of the inner shaft.

[0010] Preferably, a connecting frame is fixedly installed on the end face of the built-in shaft, and the external toothed rings located at both ends of the plurality of external toothed rings are rotatably connected to the end face of the built-in shaft and the surface of the connecting frame, and the opposite end faces of two adjacent external toothed rings are rotatably connected.

[0011] Preferably, the built-in shaft end face is provided with a plurality of external gears driven by a motor, the plurality of external gears correspond one-to-one with a plurality of external gear rings, the inner tooth surface of any external gear ring meshes with the corresponding external gear, and a connecting arm is provided between the outer side surface of any external gear ring and the corresponding rotating seat.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0013] 1. In this utility model, a rotating tube is set on the surface of the built-in shaft. The rotation of the rotating tube enables the antenna of different frequencies to rotate one circle to detect cavities around the pipe. This allows the antenna to emit electromagnetic waves from all directions inside the pipe, avoiding blind spots caused by the directionality of the geological body distribution. During the rotation, the reflection signals of the same cavity at different angles can be cross-verified. By analyzing the signal consistency, false reflections caused by uneven soil can be eliminated, improving the reliability of cavity identification.

[0014] 2. In this utility model, the combination of the fixed shielding ring and the movable shielding ring forces the electromagnetic waves to be emitted "from the inside out" in a directional manner, reducing ineffective radiation into the pipeline, concentrating energy to penetrate the pipeline wall and surrounding soil, and improving the signal strength in a high attenuation environment. The movable shielding ring can be adjusted in height by an electric push rod to be close to the inner wall of the pipeline, reducing the propagation loss of electromagnetic waves in the pipeline, ensuring that more energy reaches the surrounding strata, and enhancing the reflected signal strength of deep cavities. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of a radar positioning auxiliary device for detecting voids around pipe networks is provided for this utility model.

[0016] Figure 2 This invention proposes a radar positioning auxiliary device for detecting voids around pipe networks. Figure 1 A schematic diagram of the front section structure;

[0017] Figure 3 This invention proposes a radar positioning auxiliary device for detecting voids around pipe networks. Figure 1 A schematic diagram of the side section structure;

[0018] Figure 4 for Figure 1 Enlarged view of point A in the middle.

[0019] Legend: 1. Built-in shaft; 2. Rotary tube; 3. Movable shielding ring; 4. Antenna; 5. Mounting bracket; 6. Electric push rod; 7. Electric telescopic rod; 8. Electric wheel; 9. Connecting frame; 10. External gear; 11. External gear ring; 12. Rotating seat; 13. Connecting arm; 14. Fixed shielding ring; 15. Chamber; 16. Control device; 17. Control line; 18. Spring rod; 19. Internal gear; 20. Internal gear ring. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] like Figures 1-4 As shown, a radar positioning auxiliary device for detecting cavities around pipe networks includes an internal shaft 1. The internal shaft 1 is used to move along the pipe layout direction, and a rotating pipe 2 is rotatably connected to the surface of the internal shaft 1. An internal gear ring 20 is fixedly installed on the inner wall of the rotating pipe 2 and is rotatably connected to the surface of the internal shaft 1 and is coaxially distributed. An internal gear 19 is embedded inside the internal shaft 1 and is driven by a motor and meshes with the internal gear ring 20. In use, the internal shaft 1 is placed inside the pipe and moved along the pipe layout direction. During the movement, the internal gear 19 is driven to rotate by the motor inside the internal shaft 1, which in turn drives the meshing internal gear ring 20 to rotate the rotating pipe 2. In this solution, the rotating pipe 2 rotates one revolution clockwise and then one revolution counterclockwise.

[0023] Several mounting brackets 5 are fixedly installed on the outer wall of the rotating pipe 2 along the central axis. A fixed shielding ring 14 is fixedly installed on the side of the mounting bracket 5 facing away from the rotating pipe 2. Antennas 4 of different frequencies are fixedly installed inside the fixed shielding rings 14, and a movable shielding ring 3 is fitted around each fixed shielding ring 14. An electric push rod 6 is fixedly installed on the mounting bracket 5, parallel to the central axis of the fixed shielding ring 14. The telescopic end of the electric push rod 6 points to the bottom end of the movable shielding ring 3 and is bolted to the bottom edge of the movable shielding ring 3. In actual use, rotating the rotating pipe 2 once causes the mounting bracket 5 installed outside the rotating pipe 2 to rotate around the pipe once. During the rotation, the three antennas 4 installed on the mounting bracket 5 generate electromagnetic waves of different frequencies. Under the signal blocking effect of the fixed shielding ring 14 and the movable shielding ring 3, the electromagnetic waves generated by the antennas 4 are only... It can radiate outwards from the inside to the outside of the pipe wall, and depending on the inner diameter of the pipe, different heights of the movable shielding ring 3 can be selected to be fitted onto the fixed shielding ring 14. The movable shielding ring 3 is connected to the telescopic end of the electric push rod 6 by bolts. During use, the movable shielding ring 3 can be moved closer to the inner wall of the pipe by extending the electric push rod 6. The specific principle is as follows: low frequency electromagnetic waves (such as 100-500MHz) have strong penetration ability and are less affected by attenuation in soil with high conductivity (saline-alkali land), and can detect deep cavities around the pipe; medium and high frequency electromagnetic waves (such as 500MHz-2GHz) have high resolution and can more clearly distinguish the boundary between cavities and dense strata in soil with uneven water content; ultra-high frequency electromagnetic waves (such as 2-5GHz) are suitable for detailed identification of cavities in shallow layers (near the pipe wall) and reduce clutter interference from small-scale geological bodies such as gravel.

[0024] A chamber 15 is provided near each mounting bracket 5 within the built-in shaft 1. A control device 16 is fixedly installed in the chamber 15, and the control device 16 is connected to the antenna 4 on the adjacent mounting bracket 5 by a control line 17 that passes through the cavity wall of the chamber 15 and the surface of the rotating tube 2. Several spring rods 18 are fixedly installed at the top and bottom of the chamber 15, and the spring rods 18 at the top and bottom of the cavity are staggered. The control line 17 is in a zigzag shape in the chamber 15 and passes through the extension ends of several spring rods 18 in the same chamber 15. The control device 16 can be a commercially available pipeline detection radar. When the rotating tube 2 rotates, the antenna 4 on its surface pulls the connected control line 17 to move. When the control line 17 moves and is pulled out of the chamber 15, it will force the spring rods 18 passing through the chamber 15 to elastically contract. Therefore, when the rotating tube 2 rotates one revolution clockwise and then one revolution counterclockwise to reset, the control line 17 can be pushed back into the chamber 15 by the elastic extension of the spring rods 18 in the chamber 15.

[0025] Both ends of the built-in shaft 1 are embedded with several rotating seats 12. The rotating seats 12 are hinged with electric telescopic rods 7 that swing relative to the central axis of the built-in shaft 1. The telescopic end of the electric telescopic rod 7 is equipped with an electric wheel 8 for rolling connection with the inner wall of the pipe. In actual use, the electric telescopic rod 7 is driven to swing by installing another motor on the rotating seat 12. The extension of the electric telescopic rod 7 makes it easy for the electric wheel 8 to press against the inner wall of the pipe. The electric wheel 8 is used to start rolling along the inner wall of the pipe, so that the built-in shaft 1 can move inside the pipe.

[0026] Several external gear rings 11 are provided at both ends of the built-in shaft 1. The number of rotating seats 12 at the same end of the built-in shaft 1 is the same as the number of external gear rings 11, and the external gear rings 11 are coaxial and arranged along the central axis of the built-in shaft 1. A connecting frame 9 is fixedly installed on the end face of the built-in shaft 1. The external gear rings 11 located at both ends are rotatably connected to the end face of the built-in shaft 1 and the surface of the connecting frame 9, respectively, and the opposite end faces of two adjacent external gear rings 11 are rotatably connected. This facilitates the stabilization of the relative positions of the external gear rings 11. Furthermore, by utilizing the rotatable connection between two adjacent external gear rings 11, as well as the rotatable connection between the external gear rings 11 and the connecting frame 9 and the end face of the built-in shaft 1, any external gear ring 11 can rotate independently. The end face is provided with several external gears 10 driven by motors. Each external gear 10 corresponds to a number of external gear rings 11. The inner tooth surface of any external gear ring 11 meshes with the corresponding external gear 10, and a connecting arm 13 is provided between the outer side of any external gear ring 11 and the corresponding rotating seat 12. By using four motors installed on the end face of the built-in shaft 1 to drive the four external gears 10 to rotate, the corresponding meshing external gear rings 11 can be rotated. Under the connection of the connecting arm 13, the rotating seat 12 can be rotated on the end face of the built-in shaft 1. The position of the electric wheel 8 can be adjusted by adjusting the position of the rotating seat 12, avoiding interference from the cables laid in the pipe on the movement path of the electric wheel 8.

[0027] The method of using this utility model is as follows:

[0028] Place the built-in shaft 1 into the pipe to be tested, select the appropriate height of the movable shielding ring 3 according to the inner diameter of the pipe, and connect it to the telescopic end of the electric push rod 6 on the mounting bracket 5 with bolts; start the motor on the rotating seat 12 to drive the electric telescopic rod 7 to swing, and at the same time control the extension of the electric telescopic rod 7 to make the electric wheel 8 press against the inner wall of the pipe, ensuring that the built-in shaft 1 is stably centered.

[0029] Based on the distribution of obstacles such as cables within the pipeline, the motor on the end face of the built-in shaft 1 drives the external gear 10 to rotate, which in turn drives the rotating seat 12 to rotate via the external gear ring 11 and connecting arm 13, adjusting the position of the electric wheel 8 to avoid obstacles. Subsequently, the electric wheel 8 starts, driving the built-in shaft 1 to move along the pipeline layout direction. During the movement of the built-in shaft 1, the internal motor of the built-in shaft 1 starts, driving the internal gear 19 to rotate, which in turn drives the rotating tube 2 to rotate one revolution clockwise and then one revolution counterclockwise via the internal gear ring 20. When the rotating tube 2 rotates, the multi-frequency antenna 4 on the mounting bracket 5 rotates synchronously. Rotating around the central axis of the pipe, under the constraint of the fixed shielding ring 14 and the movable shielding ring 3, electromagnetic waves are emitted directionally from inside the pipe to all directions. After the electromagnetic waves emitted by the antenna 4 penetrate the pipe wall, they generate reflected signals when they encounter cavities, soil or geological bodies around the pipe, and are transmitted back to the control device 16 in the chamber 15 via the control line 17. When the rotating pipe 2 rotates, the control line 17 is pulled and forces the interlaced spring rods 18 in the chamber 15 to contract. When it reverses and resets, the spring rods 18 elastically extend and retract the control line 17 into the chamber 15 to avoid cable entanglement.

[0030] The wiring diagrams of the electric push rod 6, electric telescopic rod 7, electric wheel 8, motor and control device 16 in this utility model are common knowledge in the field. Their working principle is a well-known technology. The appropriate model is selected according to actual use. Therefore, the control method and wiring layout of the electric push rod 6, electric telescopic rod 7, electric wheel 8, motor and control device 16 will not be explained in detail.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A radar positioning auxiliary device for detecting cavities around pipe networks, comprising an internal shaft (1), characterized in that: The built-in shaft (1) is used to move along the pipeline layout direction, and the surface of the built-in shaft (1) is rotatably connected to a coaxially distributed rotating tube (2). Several mounting brackets (5) are fixedly installed on the outer side wall of the rotating tube (2) along the central axis direction. A fixed shielding ring (14) is fixedly installed on the side of the mounting bracket (5) facing away from the rotating tube (2). Antennas (4) of different frequencies are fixedly installed in the several fixed shielding rings (14), and a movable shielding ring (3) is sleeved on the outside of each fixed shielding ring (14). An opening is made in the built-in shaft (1) near each mounting bracket (5). There is a chamber (15), in which a control device (16) is fixedly installed and the control device (16) is connected to the antenna (4) on the adjacent mounting bracket (5) by a control line (17) passing through the cavity wall of the chamber (15) and the surface of the rotating tube (2). Several spring rods (18) are fixedly installed at the top and bottom of the cavity (15), and the spring rods (18) at the top and bottom of the cavity are staggered. The control line (17) is in the shape of a broken line in the cavity (15) and passes through the extension ends of several spring rods (18) in the same cavity (15) in sequence.

2. The radar positioning auxiliary device for detecting cavities around pipe networks according to claim 1, characterized in that: The inner wall of the rotating tube (2) is fixedly installed with an internal gear ring (20) that is rotatably connected to the surface of the built-in shaft (1) and coaxially distributed. The built-in shaft (1) is internally equipped with an internal gear (19) that is driven by a motor and meshes with the internal gear ring (20).

3. The radar positioning auxiliary device for detecting cavities around pipe networks according to claim 1, characterized in that: An electric push rod (6) is fixedly installed on the mounting bracket (5) and is arranged parallel to the central axis of the fixed shielding ring (14). The telescopic end of the electric push rod (6) points to the bottom end of the movable shielding ring (3) and is connected to the bottom edge of the movable shielding ring (3) by bolts.

4. The radar positioning auxiliary device for detecting cavities around pipe networks according to claim 1, characterized in that: Both ends of the built-in shaft (1) are fitted with several rotating seats (12), and the rotating seats (12) are hinged with an electric telescopic rod (7) that swings relative to the central axis of the built-in shaft (1). The telescopic end of the electric telescopic rod (7) is equipped with an electric wheel (8) for rolling connection with the inner wall of the pipe.

5. The radar positioning auxiliary device for detecting cavities around pipe networks according to claim 4, characterized in that: The inner shaft (1) is provided with several external toothed rings (11) at both ends. The number of rotating seats (12) at the same end of the inner shaft (1) is the same as the number of external toothed rings (11), and the several external toothed rings (11) are coaxial and arranged along the central axis of the inner shaft (1).

6. The radar positioning auxiliary device for detecting cavities around pipe networks according to claim 5, characterized in that: The end face of the built-in shaft (1) is fixedly installed with a connecting frame (9). Among the several external toothed rings (11), the external toothed rings (11) located at both ends are rotatably connected to the end face of the built-in shaft (1) and the surface of the connecting frame (9), and the opposite end faces of two adjacent external toothed rings (11) are rotatably connected.

7. The radar positioning auxiliary device for detecting cavities around pipe networks according to claim 6, characterized in that: The end face of the built-in shaft (1) is provided with a number of external gears (10) driven by a motor. The number of external gears (10) corresponds one-to-one with a number of external gear rings (11). The inner tooth surface of any external gear ring (11) meshes with the corresponding external gear (10), and a connecting arm (13) is provided between the outer side of any external gear ring (11) and the corresponding rotating seat (12).

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