CN217110950U - Mileage measuring device and pipeline detector - Google Patents

Abstract

The present disclosure relates to the field of pipeline detector technology, and in particular, to a mileage measuring device and a pipeline detector. The mileage measuring device can move in the pipeline under the driving of the driving unit and comprises a main body part, a supporting part, a connecting part and a mileage wheel, wherein the supporting part is connected to the main body part, two ends of the connecting part are connected to the main body part, the mileage wheel is connected to the connecting part and is located on the outermost side of the connecting part, and the driving unit drives the mileage wheel to move in the pipeline along the first direction or the second direction. When the mileage measuring device meets a position exceeding the passing capacity of the mileage measuring device, the driving unit can drive the mileage measuring device to move reversely, so that the blockage problem is avoided, and the mileage measuring device does not need to be taken out by cutting off a pipeline.

Description

Mileage measuring device and pipeline detector

Technical Field

The present disclosure relates to the field of pipeline detector technology, and in particular, to a mileage measuring device and a pipeline detector.

Background

The detector is pushed by fluid pressure to move forward in the long-distance pipeline, the carried magnet device magnetizes the pipeline passing through, when the pipeline has defects caused by corrosion or mechanical damage, a leakage magnetic field is generated at the defect position, and the size of the pipeline defect can be obtained by detecting and analyzing the defect leakage magnetic field. For pipeline defect detection, not only the size of the defect, but also the specific position of the defect in the pipeline need to be known, so as to provide accurate data for pipeline maintenance.

The method that the odometer wheel is installed on the pipeline detector in the pipeline magnetic leakage is often adopted for determining the position of the pipeline defect, when the pipeline detector in the pipeline magnetic leakage moves in the pipeline, the odometer wheel is tightly attached to the inner wall of the pipeline and rolls along with the movement of the pipeline detector in the magnetic leakage, the moving distance of the pipeline detector in the magnetic leakage can be calculated by recording the number of times of the rolling angle of the odometer wheel, and the position distribution of the defect along the pipeline can be calculated by combining the magnetic leakage signal measured along the pipeline.

However, when a small-diameter pipeline is detected, blockage is easily caused in the detection process, the conventional internal detector mileage wheel structure is in the pipeline, the mileage wheel can only roll in a single direction and cannot roll in a reverse direction under the driving of a driving device due to the arrangement of a connecting piece connected with the mileage wheel, and once blockage occurs, the blockage can only block a broken pipe and be taken out, so that normal production operation is influenced, and great economic loss is caused.

SUMMERY OF THE UTILITY MODEL

To solve the technical problem or at least partially solve the technical problem, the present disclosure provides a mileage measuring device and a pipeline detector.

The present disclosure provides a mileage measuring device, can move in the pipeline under drive unit's drive, include: the device comprises a main body part, a supporting part, a connecting part and a mileage wheel, wherein the supporting part is connected to the main body part, two ends of the connecting part are connected to the main body part, the mileage wheel is connected to the connecting part, and the driving unit drives the mileage wheel to move in a first direction or a second direction in a pipeline.

Optionally, the mileage wheel includes wheel body, connecting axle and connector, the wheel body with the connecting axle rotates to be connected, the connector with the connecting axle rotates to be connected, just the connector with adapting unit connects.

Optionally, the connecting part is an elastic connecting part for contacting the mileage wheel with the inner wall of the pipeline.

Optionally, a recess is provided on the support member.

Optionally, an encoder is arranged on the mileage wheel and used for measuring and recording mileage.

The present disclosure also provides a pipeline detector, comprising: the device comprises a detection unit, a first driving unit, a second driving unit and the mileage measuring device;

the mileage measuring device is connected with the detection unit, the first driving unit is used for driving the detection unit and the mileage measuring device to move along a first direction, and the second driving unit is used for driving the detection unit and the mileage measuring device to move along a second direction.

Optionally, the detection unit and the mileage measuring device are located between the first driving unit and the second driving unit, the mileage measuring device is connected with the first driving unit, and the detection unit is connected with the second driving unit.

Optionally, the first drive unit comprises a first drive body, a first sealing member and a first support member, the first sealing member and the first support member being mounted on the first drive body;

the first sealing element is abutted to the first supporting piece, a plurality of first grooves are formed in the first supporting piece, and the first sealing element is located between the first supporting piece and the detection unit.

Optionally, the second driving unit comprises a second driving body, a second sealing member and a second supporting member, and the second sealing member and the second supporting member are mounted on the second driving body;

the second sealing element is abutted to the second supporting piece, a plurality of second grooves are formed in the second supporting piece, and the second sealing element is located between the second supporting piece and the mileage measuring device.

Optionally, the detection unit includes a detection body, a detection piece and a magnetic piece, and the detection piece and the magnetic piece are mounted on the detection body;

the magnetic part is in contact with the inner wall of the pipeline and used for generating a magnetic field loop, and a third groove is formed in the outer wall of the magnetic part;

the detection piece is used for contacting with the inner wall of the pipeline and detecting leakage magnetic flux.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the embodiment of the disclosure provides a mileage measuring device, including main part, supporting component, adapting unit and mileage wheel, the supporting component is connected on the main part, and the both ends of adapting unit all connect on the main part, and the mileage wheel is connected on adapting unit, and the mileage wheel is located the outside of adapting unit, and drive unit drives the mileage wheel and moves along first direction or second direction inside the pipeline. When the mileage measuring device meets a position exceeding the passing capacity of the mileage measuring device, the driving unit can drive the mileage measuring device to move reversely, so that the blockage problem is avoided, and the mileage measuring device does not need to be taken out by cutting off a pipeline.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a mileage measuring device according to an embodiment of the present disclosure;

FIG. 2 is a front view of a mileage measuring device according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a duct detector according to an embodiment of the present disclosure;

FIG. 4 is a front view of a duct detector according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a detection unit of a duct detector according to an embodiment of the disclosure;

fig. 6 is a schematic structural diagram of a first driving unit of the pipeline detector according to the embodiment of the disclosure;

fig. 7 is a schematic structural diagram of a second driving unit of the pipeline detector according to the embodiment of the disclosure.

Wherein the content of the first and second substances,

1. a mileage measuring device; 11. a main body member; 12. a support member; 121. a recessed portion; 13. a connecting member; 14. a mileage wheel; 141. a wheel body; 142. a connecting shaft; 143. a linker; 2. a detection unit; 21. detecting a subject; 22. a detection member; 221. a probe; 222. an elastic member; 23. a magnetic member; 231. a third groove; 232. a steel brush; 3. a first drive unit; 31. a first drive body; 32. a first seal member; 33. a first support member; 331. a first groove; 34. a first impact-resistant component; 4. a second driving unit; 41. a second driving body; 42. a second seal member; 43. a second support member; 431. a second groove; 44. a second impact-resistant component; 5. an axial connecting joint; 6. a connector; 7. a barrel; 8. a flange plate.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Referring to fig. 1-2, the embodiment of the present disclosure provides a mileage measuring device 1, wherein the mileage measuring device 1 is driven by a driving unit to move inside a pipeline, and includes a main body part 11, a supporting part 12, a connecting part 13, and a mileage wheel 14, the supporting part 12 is connected to the main body part 11, both ends of the connecting part 13 are connected to the main body part 11, the mileage wheel 14 is connected to the connecting part 13, the mileage wheel 14 is located at the outermost side of the connecting part 13, and the driving unit drives the mileage wheel 14 to move inside the pipeline along a first direction or a second direction. When the mileage measuring device 1 is in a position exceeding the passing capacity of the mileage measuring device, the driving unit can drive the mileage measuring device 1 to move reversely, so that the blockage problem is avoided, and the mileage measuring device does not need to be taken out by cutting off a pipeline.

The mileage wheel 14 comprises a wheel body 141, a connecting shaft 142 and a connecting body 143, the wheel body 141 is rotatably connected with the connecting shaft 142, the connecting body 143 is connected with the connecting part 13, the mileage wheel 14 is fixed on the connecting part 13 through the connecting body 143, meanwhile, the wheel body 141 can rotate around the connecting shaft 142, and the moving distance of the mileage wheel 14 can be calculated through the rotating angle of the wheel body 141.

In addition, the connecting part 13 is an elastic connecting part 13, and the elastic connecting part 13 can be a spring plate, and can provide an elastic force for the mileage wheel 14, so that the mileage wheel 14 is in contact with the inner wall of the pipeline, and the mileage wheel 14 rolls by virtue of friction force. In addition, the mileage wheel 14 can move up and down following the elastic connection member.

The support member 12 is provided with a recess 121, and the recess 121 is provided to facilitate the passage of fluid.

The mileage wheel 14 is provided with an encoder for measuring and recording mileage (the encoder is an encoder commonly used in mileage measuring devices).

The body part 11 further comprises a connecting body and a flange 8, the third support member being secured to the connecting body by means of the flange 8, and the flange 8 being connected to the axial connector 5 by means of the connector 6.

The third supporting piece can be a supporting cup. The supporting leather cup has certain interference, firstly, allowance is reserved for reducing friction, and secondly, the supporting leather cup can be in close contact with a pipeline. The supporting leather cup has certain interference in general.

Referring to fig. 3-7, embodiments of the present disclosure provide a duct detector, which includes: a detection unit 2, a first drive unit 3, a second drive unit 4, and a mileage measuring device 1; the detection unit 2 is used for detecting the defects of the pipeline, the detection unit 2 is connected with the mileage measurement device 1, the mileage measurement device 1 is used for measuring the mileage of the walking of the pipeline detector, and when the detection unit 2 detects the defects, the mileage measurement device 1 can record the mileage of the walking, so that a specific position can be conveniently located, and the defects can be conveniently maintained. Meanwhile, the first driving unit 3 is used for driving the detection unit 2 and the mileage measurement device 1 to move along the first direction, the second driving unit 4 is used for driving the detection unit 2 and the mileage measurement device 1 to move along the second direction, so that the pipeline detector can move in two directions, and when the pipeline detector is in a position exceeding the passing capacity of the pipeline detector, the pipeline detector can move in the opposite direction, so that the problem of blockage is avoided, and the pipeline does not need to be cut off to be taken out.

Wherein, the mileage measuring device 1, the detecting unit 2, the first driving unit 3 and the second driving unit 4 are in close contact with the inner wall of the pipeline and move in the pipeline.

In addition, the first direction can be that first drive unit 3 drives the pipeline detector forward and removes, and the second direction can be that second drive unit 4 drives pipeline detector reverse movement, and first drive unit 3 drives pipeline detector and removes from the first end of pipeline to the second end promptly, detects whether there is damaged department in the pipeline inner and outer wall, when removing the position that surpasss its current capacity, second drive unit 4 then drives pipeline detector reverse movement to avoid the stifled problem of card. When the pipeline detector moved to the position of defect simultaneously, mileage measuring device 1 can also note the mileage of pipeline detector walking, consequently is convenient for the later stage to maintain the defect position.

Axial connecting joints 5 are connected between the first driving unit 3 and the detecting unit 2, between the detecting unit 2 and the mileage measuring device 1, and between the mileage measuring device 1 and the second driving unit 4, and the mileage measuring device 1, the detecting unit 2, the first driving unit 3, and the second driving unit 4 are connected together through the axial connecting joints 5.

The detection unit 2 can detect the position of the defect of the pipeline, the mileage measuring device 1 can record the moving distance of the pipeline detector, the moving distance of the pipeline detector can be calculated by recording the rolling angle of the mileage wheel 14, and the position distribution of the defect along the pipeline can be calculated by combining the magnetic leakage signal measured along the pipeline.

In some embodiments, the detection unit 2 and the mileage measuring device 1 are located between the first driving unit 3 and the second driving unit 4, the mileage measuring device 1 is connected to the first driving unit 3, and the detection unit 2 is connected to the second driving unit 4, so that the first driving unit 3 and the second driving unit 4 can drive the detection unit 2 and the mileage measuring device 1 to move forward and backward.

In some embodiments, the first driving unit 3 includes a first driving body 31, a first sealing member 32 and a first supporting member 33, the first sealing member 32 and the first supporting member 33 are installed on the first driving body 31, the first sealing member 32 abuts against the first supporting member 33, a plurality of first grooves 331 are formed in the first supporting member 33, and the first sealing member 32 is located between the first supporting member 33 and the detecting unit 2. When the fluid flows in the first direction, the first sealing member 32 can block the fluid, and the first driving unit 3 can be moved in the first direction under the pushing action of the fluid, so that the pipeline detector can be moved.

The first sealing member 32 is a flexible sealing member, and when the fluid pushes the first sealing member 32, the first sealing member 32 can be attached to the first supporting member 33 more tightly, so that the fluid is prevented from flowing out through the first sealing member 32 as much as possible, and the first driving unit 3 can be powered better by the flow of the fluid.

In addition, the first recess 331 is configured to facilitate the flow of fluid, which is able to flow through the first recess 331 when the duct detector is moved in the second direction.

The two first sealing members 32 and the two first supporting members 33 are respectively disposed, the two first sealing members 32 are located on two sides of the first driving body 31, the two first supporting members 33 are also located on two sides of the first driving body 31, and the two first sealing members 32 are disposed to enable a better sealing effect.

The first sealing element 32 may be a sealing cup, and the first supporting element 33 may be a supporting cup, and the thickness of the supporting cup is greater than that of the sealing cup. The first drive body 31 may comprise a cylinder 7 and a flange 8, the first seal 32 and the first support 33 being secured to the cylinder 7 by the flange 8, and the flange 8 being connected to the joint by the connector 6.

The sealing leather cup and the supporting leather cup have certain interference, firstly, allowance is reserved for reducing friction, and secondly, the sealing leather cup and the supporting leather cup can be in close contact with a pipeline. The sealing cup and the supporting cup have certain interference in general.

The above-mentioned tube 7 is provided with a large-capacity battery, and since the two-way operation pipeline detector for detecting the leakage flux of the pipeline is sealed in the pipeline when working, it is not possible to use an external power supply to provide electric energy, but to maintain the normal operation of the pipeline detector, it is necessary for the pipeline detector to carry a large-capacity battery, so as to provide sufficient electric energy for the normal detection, processing and data storage of the pipeline detector.

In some embodiments, the second driving unit 4 includes a second driving body 41, a second sealing member 42 and a second supporting member 43, the second sealing member 42 and the second supporting member 43 are mounted on the second driving body 41, the second sealing member 42 abuts against the second supporting member 43, a plurality of second grooves 431 are formed on the second supporting member 43, and the second sealing member 42 is located between the second supporting member 43 and the mileage measuring device 1. When the fluid flows in the second direction, the second sealing member 42 can block the fluid, and the second driving unit 4 can be moved in the second direction under the pushing action of the fluid, so that the pipeline detector can be moved.

Wherein, the second sealing member 42 is a flexible sealing member, when the fluid pushes the second sealing member 42, the second sealing member 42 can be attached to the second supporting member 43 more tightly, and the fluid is prevented from flowing out through the second sealing member 42 as much as possible, so that the second driving unit 4 can be powered better by the flowing of the fluid.

In addition, the second groove 431 is provided to facilitate the flow of the fluid, which can pass through the second groove 431 only when the duct detector moves in the first direction.

The two second sealing members 42 and the two second supporting members 43 are respectively disposed, the two second sealing members 42 are located on two sides of the second driving body 41, the two second supporting members 43 are also located on two sides of the second driving body 41, and the two second sealing members 42 can achieve a better sealing effect.

The second sealing member 42 may be a sealing cup, and the second supporting member 43 may be a supporting cup, which has a thickness greater than that of the sealing cup. The second drive body 41 may comprise a barrel 7. the barrel 7 may be of the same construction as the barrel 7 of the first drive body 31 and the flange 8. the second seal 42 and the second support 43 are secured to the barrel 7 by the flange 8 and the flange 8 is connected to the coupling by the connector 6.

The sealing leather cup and the supporting leather cup have certain interference, firstly, allowance is reserved for reducing friction, and secondly, the sealing leather cup and the supporting leather cup can be in close contact with a pipeline. The sealing cup and the supporting cup have certain interference in general.

The first anti-collision part 34 is arranged on the side, away from the detection unit 2, of the first driving unit 3, the second anti-collision part 44 is arranged on the side, away from the mileage measuring device 1, of the second driving unit 4, and through the arrangement of the first anti-collision part 34 and the second anti-collision part 44, other substances can be prevented from directly colliding with the first driving unit 3 and the second driving unit 4.

When the pipeline detector needs to move along the first direction, fluid is introduced into the pipeline, the fluid flows along the first direction, namely flows from left to right in the drawing, at the moment, the fluid sequentially flows to the mileage measuring device 1 and the detection unit 2 through the second groove 431, when the fluid flows to the first driving unit 3, the fluid is blocked by the first sealing element 32, and at the moment, the fluid can push the first driving unit 3 to move along the first direction, namely move in the positive direction. When the pipeline detector needs to move along the second direction, fluid is introduced into the pipeline, the fluid flows along the second direction, namely flows from right to left in the drawing, at the moment, the fluid sequentially flows to the detection unit 2 and the mileage measuring device 1 through the first groove 331, when the fluid flows to the second driving unit 4, the fluid is blocked by the second sealing element 42, at the moment, the fluid can push the second driving unit 4 to move along the second direction, namely move reversely, and therefore the forward and reverse movement of the pipeline detector is achieved.

In some embodiments, the detecting unit 2 includes a detecting body 21, a detecting member 22, and a magnetic member 23, the detecting member 22 and the magnetic member 23 being mounted on the detecting body 21; the magnetic member 23 contacts with the inner wall of the pipeline to generate a magnetic field loop, a third groove 231 is formed in the outer wall of the magnetic member 23, the third groove 231 is used for flowing fluid, the detection member 22 is used for contacting with the inner wall of the pipeline to detect the magnetic field loop, leakage flux at a defect position can be detected, and the detection member 22 can detect the position of the inner wall and the outer wall of the pipeline to be damaged.

The detecting part 22 includes a plurality of probes 221 and a plurality of elastic parts 222, the probes 221 are connected with the detecting body 21 through the elastic parts 222, when the wall thickness of the pipeline is not changed, the wall thickness of the pipeline is uniform, the generated magnetic lines of force are also parallel, when the inner and outer walls of the pipeline are damaged, such as pits or bulges, the magnetic lines of force overflow, and the generated magnetic lines of force are wavy lines. The probe 221 can detect signals of the damaged inner wall, and the probe 221 is provided with a plurality of probes, so that the probe 221 can detect each part of the inner wall and the outer wall of the annular pipeline, and the elastic piece 222 can drive the probe 221 to move.

The probe 221 is provided with a hall element, the joint of the hall element and the inner wall of the pipeline is made of non-magnetic and wear-resistant materials, the whole probe 221 is completely closed, and the hall element is used for measuring leakage magnetic flux.

In addition, the elastic member 222 may be an elastic sheet, and can always abut the probe 221 against the inner wall of the pipeline for detecting the damaged position of the inner and outer walls of the pipeline. When the probe 221 touches the protrusion, the spring is pressed, and when the probe 221 touches the recess, the spring drives the probe 221 to move outward.

The plurality of probes 221 and the plurality of elastic members 222 form a ring structure for fitting the inner wall of the pipe.

The probe 221 has an eddy current sensor thereon, which can identify defects in the inner wall of the pipe.

The magnetic member 23 includes a steel brush 232, a permanent magnet not shown in the figure and a yoke not shown in the figure, the permanent magnet is located outside the yoke, the steel brush 232 is sleeved on the outer wall of the permanent magnet, and the steel brush 232 mainly magnetizes the tube wall to generate leakage magnetic flux. And the outer wall of the steel brush 232 is provided with a third groove 231, and the third groove 231 is used for the circulation of fluid.

The steel brush 232 and the probe 221 both have a certain interference, so that firstly, allowance is reserved for reducing friction, and secondly, the steel brush can be in close contact with a pipeline. The steel brush 232 and the probe 221 typically have a% interference.

In summary, according to the pipe detector operating in two directions provided by the embodiment of the present disclosure, when the detecting unit 2 detects a defect, the mileage measuring device 1 can record the mileage of walking, so as to locate a specific position and maintain the defect conveniently. Meanwhile, the first driving unit 3 is used for driving the detecting unit 2 and the mileage measuring device 1 to move along the first direction, the second driving unit 4 is used for driving the detecting unit 2 and the mileage measuring device 1 to move along the second direction, so that the pipeline detector can move in two directions, and when the pipeline detector meets a position exceeding the passing capacity of the pipeline detector, the pipeline detector can move in the opposite direction, so that the problem of blocking is avoided. The first driving unit 3 and the second driving unit 4 are powered by the pressure difference between the front and the back of the first sealing element 32 and the second sealing element 42, so that the running power of the pipeline detector is provided, and the whole pipeline detector is driven to run in the pipeline. Meanwhile, the first driving unit 3 and the second driving unit 4 are core parts of the pipeline detector and are responsible for process control and detection data processing and storage during detection, and the mileage wheel 14 measures and records mileage through an encoder (the encoder is a common encoder in a mileage measuring device), so that the defect position is determined.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A mileage measuring device (1) capable of moving inside a pipe by being driven by a driving unit, comprising: the pipeline mileage mechanism comprises a main body part (11), a supporting part (12), a connecting part (13) and a mileage wheel (14), wherein the supporting part (12) is connected to the main body part (11), two ends of the connecting part (13) are connected to the main body part (11), the mileage wheel (14) is connected to the connecting part (13), and the driving unit drives the mileage wheel (14) to move in a first direction or a second direction in a pipeline.

2. The mileage measuring device (1) according to claim 1, wherein the mileage wheel (14) comprises a wheel body (141), a connecting shaft (142), and a connecting body (143), the wheel body (141) is rotatably connected to the connecting shaft (142), the connecting body (143) is rotatably connected to the connecting shaft (142), and the connecting body (143) is connected to the connecting member (13).

3. Mileage measuring device (1) according to claim 1, characterized in that the connecting part (13) is an elastic connecting part for bringing the mileage wheel (14) into contact with the inner wall of the pipe.

4. Mileage measuring device (1) according to claim 1, characterized in that a recess (121) is provided on the support part (12).

5. Mileage measuring device (1) according to claim 1, characterized in that an encoder is arranged on the mileage wheel (14) for measuring and recording mileage.

6. A duct detector, comprising: a detection unit (2), a first drive unit (3), a second drive unit (4) and a mileage measuring device (1) of any one of claims 1 to 5;

the mileage measuring device (1) is connected with the detection unit (2), the first driving unit (3) is used for driving the detection unit (2) and the mileage measuring device (1) to move along a first direction, and the second driving unit (4) is used for driving the detection unit (2) and the mileage measuring device (1) to move along a second direction.

7. The pipeline detector according to claim 6, characterized in that the detection unit (2) and the mileage measuring device (1) are located between the first drive unit (3) and the second drive unit (4), the mileage measuring device (1) being connected to the first drive unit (3) and the detection unit (2) being connected to the second drive unit (4).

8. The duct detector according to claim 7, characterized in that the first drive unit (3) comprises a first drive body (31), a first seal (32) and a first support (33), the first seal (32) and the first support (33) being mounted on the first drive body (31);

the first sealing element (32) is abutted to the first supporting element (33), a plurality of first grooves (331) are formed in the first supporting element (33), and the first sealing element (32) is located between the first supporting element (33) and the detection unit (2).

9. The duct detector according to claim 7, characterized in that the second drive unit (4) comprises a second drive body (41), a second seal (42) and a second support (43), the second seal (42) and the second support (43) being mounted on the second drive body (41);

the second sealing element (42) is abutted against the second support element (43), a plurality of second grooves (431) are formed in the second support element (43), and the second sealing element (42) is located between the second support element (43) and the mileage measuring device (1).

10. The duct detector according to claim 6, characterized in that the detection unit (2) comprises a detection body (21), a detection member (22) and a magnetic member (23), the detection member (22) and the magnetic member (23) being mounted on the detection body (21);

the magnetic part (23) is in contact with the inner wall of the pipeline and used for generating a magnetic field loop, and a third groove (231) is formed in the outer wall of the magnetic part (23);

the detection piece (22) is used for contacting with the inner wall of the pipeline and detecting leakage magnetic flux.

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