Detector for detection in buried polyethylene gas pipe and detection method thereof

Abstract

The invention relates to the technical field of detectors, in particular to a detector for detecting the interior of a buried polyethylene gas pipe and a detection method thereof.The detector comprises a body of a capsule-shaped structure on the whole, and the body comprises a speed control mechanism, an acoustic detection mechanism, an auxiliary movement mechanism and a communication mechanism which are sequentially arranged in the axial direction; the acoustic detection mechanism is used for collecting sound signals in a pipeline, the auxiliary movement mechanism is used for making contact with the inner wall of the pipeline and sealing the inner wall of the pipeline, so that pressure difference is formed between the front portion and the rear portion of the body, and the body is driven to move in the pipeline. The opening degree of the air inlet is controlled in cooperation with the opening degree adjusting mechanism, the displacement speed of the body in the pipeline is controlled, sound in the pipeline is collected through the acoustic detection mechanism, rapid pipeline detection is achieved, the detection efficiency of the buried pipeline is improved, the omission ratio is reduced, and the situation that existing manual detection wastes time and labor is avoided, and the omission ratio is high is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of detectors, and in particular to a detector for detecting inside a buried polyethylene gas pipe and a detection method thereof. Background Art

[0002] Polyethylene pipes are widely used in urban gas transportation due to their corrosion resistance, good toughness, economy and environmental protection. However, as the service life increases, polyethylene gas pipelines will inevitably have safety problems such as internal cracks, aging of pipeline structure, misalignment of pipe interfaces, and deformation of pipe bodies, which will further cause gas pipeline leakage accidents. Therefore, it is urgent to carry out urban polyethylene gas pipeline leakage detection.

[0003] Since most polyethylene gas pipelines in cities and towns are buried, they are non-magnetic, highly insulated, and have complex interlacing between pipeline networks. Therefore, traditional steel pipeline detection technology cannot be well applied to polyethylene gas pipelines. The existing well-used gas pipeline detection methods include manual inspection: experienced workers hold gas leak detectors on the ground to detect along the pipeline direction. Since the direction of old pipelines is unknown, this method is time-consuming and labor-intensive, and has a high missed detection rate; leakage magnetic internal detection method: by placing leakage magnetic internal detectors in the pipeline to obtain the corrosion defects of the pipeline, however, this method is only applicable to the detection of ferromagnetic pipelines; acoustic emission method: stick sensors on the pipe wall to receive elastic waves caused by leaks. Leaks are identified by converting elastic waves into electrical signals. This method is difficult to detect tiny leaks. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problems that the existing manual detection is time-consuming and labor-intensive, the missed detection rate is high, and the existing magnetic leakage internal detection method is difficult to detect tiny leaks, a detector for buried polyethylene gas pipe internal detection and a detection method thereof are now provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a detector method for detecting inside a buried polyethylene gas pipe, comprising a body with an overall capsule-shaped structure, the body comprising a speed control mechanism, an acoustic detection mechanism, an auxiliary motion mechanism and a communication mechanism arranged in sequence along the axial direction, the acoustic detection mechanism is used to collect sound signals in the pipeline, the auxiliary motion mechanism is used to contact and seal with the inner wall of the pipeline, so that a pressure difference is formed before and after the body, and the body is driven to move in the pipeline, and the communication mechanism is respectively connected to the speed control mechanism and the acoustic detection mechanism signal and stores the collected sound signals;

[0006] The speed control mechanism includes an air inlet arranged at one end of the body and an air outlet arranged at the other end of the body, the air inlet and the air outlet are interconnected, and the air inlet and the air outlet are used to interconnect the pressure difference parts of the body located before and after the auxiliary motion mechanism, and the body is provided with an opening adjustment mechanism for controlling the opening of the air inlet. Compared with the prior art, this solution provides a driving force for the displacement of the body in the pipeline through the auxiliary motion mechanism, and cooperates with the opening adjustment mechanism to control the opening of the air inlet, thereby controlling the displacement speed of the body in the pipeline, and collecting the sound in the pipeline through the acoustic detection mechanism, thereby realizing rapid detection of the pipeline, improving the detection efficiency of the buried pipeline, and reducing the missed detection rate.

[0007] In order to realize the opening adjustment mechanism, some preferred embodiments include the opening adjustment mechanism comprising a stopper and a driving mechanism for driving the stopper to move, and the baffle is arranged on the body and is used to cooperate with the air inlet.

[0008] In order to quickly control the displacement speed of the main body in the pipeline, in some preferred embodiments, a plurality of air inlets are arranged on the main body along the circumferential direction, and the blocks are arranged in one-to-one correspondence with the air inlets.

[0009] In order to realize the auxiliary movement mechanism, some preferred embodiments include a skirt with elastic deformation ability, the skirt is arranged along the circumferential direction of the main body, and an auxiliary deformation mechanism is arranged between the skirt and the main body for controlling the skirt to always contact and seal with the inner wall of the pipe.

[0010] In order to realize the auxiliary deformation mechanism, some preferred embodiments include a plurality of cylinders, which are arranged along the circumferential direction of the main body, one end of the cylinders is hinged on the main body, and the other end of the cylinders is arranged on the skirt.

[0011] In some preferred embodiments, a roller is provided at one end of the cylinder located at the skirt, the skirt is located between the cylinder and the roller, and the roller is used for rolling contact with the inner circumferential wall of the pipe.

[0012] In some preferred embodiments, a plurality of the cylinders are arranged along a circular direction and tilted in the same direction.

[0013] In some preferred embodiments, the acoustic detection mechanism includes a MEMS microphone array arranged on the body, and the communication mechanism includes a power supply battery, a data acquisition card and an ultra-low frequency transmitter arranged on the body, and the power supply battery is electrically connected to the data acquisition card and the ultra-low frequency transmitter respectively.

[0014] In order to prevent collision between the pipeline and the body, in some preferred embodiments, an anti-collision mechanism is provided at one end of the body close to the speed control mechanism, and the anti-collision mechanism includes an anti-collision head made of explosion-proof material.

[0015] A detection method using a detector for detecting inside a buried polyethylene gas pipe as described above is characterized in that the specific operation steps are as follows:

[0016] S1. In the valve chamber, place the acoustic detector into the buried polyethylene gas pipe through a portable launch tube;

[0017] S2, the acoustic detector is driven to move by the driving pressure difference formed by the contact seal between the skirt and the inner wall of the pipe, and the speed control mechanism is used to control the opening of the air inlet to achieve a stable displacement speed of the acoustic detector;

[0018] S3, the acoustic detector moves in the pipeline, collects the sound signal in the pipeline through the acoustic detection mechanism, and stores the collected sound signal in the communication mechanism;

[0019] S4. Recover the acoustic detector in the valve chamber through a portable ball collecting tube, import the data in the data acquisition card in the communication mechanism into the computer for data analysis, and process the sound signals collected by the microphone array to determine whether the pipeline is leaking and the amount of leakage.

[0020] The beneficial effects of the present invention are as follows: when in use, the detector and detection method of the present invention for detecting inside a buried polyethylene gas pipe provide a driving force for displacement of the main body in the pipe through an auxiliary motion mechanism, and cooperate with an opening adjustment mechanism to control the opening of the air inlet, thereby controlling the displacement speed of the main body in the pipe, and collecting the sound in the pipe through an acoustic detection mechanism to achieve rapid detection of the pipe, thereby improving the detection efficiency of the buried pipe, reducing the missed detection rate, and avoiding the time-consuming and labor-intensive existing manual detection, the high missed detection rate, and the problem that the existing leakage magnetic internal detection method is difficult to detect tiny leaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 3 It is a front view of the present invention;

[0025] Figure 4 is a top view of the present invention;

[0026] Figure 5 is a bottom view of the present invention;

[0027] Figure 6 yes Figure 3 Middle AA section view;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the speed control mechanism on the main body of the present invention;

[0029] Figure 8 It is a front view of the speed control mechanism on the main body of the present invention;

[0030] Fig. 9 It is a top view of the speed control mechanism on the main body of the present invention;

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the main body located at the speed control mechanism in the present invention;

[0032] Fig.11 It is a schematic diagram of the three-dimensional structure of the stopper in the present invention.

[0033] In the figure: 1. body;

[0034] 2. speed control mechanism, 201. air inlet, 202. air outlet, 203. stopper;

[0035] 3. Acoustic testing agency;

[0036] 4. Auxiliary motion mechanism, 401, skirt, 402, cylinder, 403, roller;

[0037] 5. Communications agencies;

[0038] 6. Prevent head collision. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with embodiments:

[0040] The present invention is not limited to the following specific embodiments. A person skilled in the art can implement the present invention in various other specific embodiments according to the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and ideas of the present invention fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] like Figure 1-11 As shown, a detector method for detecting inside a buried polyethylene gas pipe comprises a body 1 which is in a capsule-shaped structure as a whole. The body 1 comprises a speed control mechanism 2, an acoustic detection mechanism 3, an auxiliary motion mechanism 4 and a communication mechanism 5 which are sequentially arranged along the axial direction. The acoustic detection mechanism 3 is used to collect sound signals in the pipeline. The auxiliary motion mechanism 4 is used to contact and seal with the inner wall of the pipeline so that a pressure difference is formed before and after the body 1 to drive the body 1 to move in the pipeline. The communication mechanism 5 is respectively connected to the speed control mechanism 2 and the acoustic detection mechanism 3 and stores the collected sound signals.

[0044] The speed control mechanism 2 includes an air inlet 201 arranged at one end of the main body 1 and an air outlet 202 arranged at the other end of the main body 1. The air inlet 201 and the air outlet 202 are connected to each other. The air inlet 201 and the air outlet 202 are used to connect the pressure difference parts of the main body 1 located before and after the auxiliary motion mechanism 4 to each other, control the pressure on one side of the main body 1, and thus control the force acting on the main body 1 to achieve control of the displacement speed of the main body 1. An opening adjustment mechanism for controlling the opening of the air inlet 201 is provided on the main body 1.

[0045] The opening adjustment mechanism includes a block 203 and a driving mechanism. In this embodiment, the driving mechanism is a motor. The baffle is fixed to the output end of the motor. The motor is fixed to the main body 1. The baffle is arranged on the main body 1 and is used to cooperate with the air inlet 201. A plurality of air inlets 201 are evenly distributed along the circumferential direction on the main body 1. The block 203 is arranged one-to-one with the air inlet 201. In this embodiment, a plurality of baffles are evenly distributed along the circumference.

[0046] The auxiliary motion mechanism 4 includes a skirt 401 with elastic deformation ability, the skirt 401 is arranged along the circumferential direction of the body 1, an auxiliary deformation mechanism is arranged between the skirt 401 and the body 1, the auxiliary deformation mechanism is used to control the skirt 401 to always contact and seal with the inner wall of the pipe, the auxiliary deformation mechanism includes a plurality of cylinders 402, the plurality of cylinders 402 are arranged along the circumferential direction of the body 1, one end of the plurality of cylinders 402 is hinged on the body 1, the other end of the plurality of cylinders 402 is arranged on the skirt 401, a roller 403 is arranged at one end of the cylinder 402 located at the skirt 401, the skirt 401 is located between the cylinder 402 and the roller 403, the roller 403 is used to roll in contact with the inner wall of the pipe, the plurality of cylinders 402 It is arranged in a circular direction and inclined in the same direction. Two groups of auxiliary motion mechanisms 4 are arranged at intervals along the axial direction of the main body 1. In this embodiment, the skirt 401 is made of highly wear-resistant and highly elastic polyurethane material. The driving pressure difference formed by interference contact and sealing with the inner wall of the pipe realizes the self-driven movement of the acoustic detector. When the acoustic detector passes through the elbow section of the deformation section in the pipe, it contacts the inner wall of the pipe through the roller 403, and uses rolling friction instead of surface friction to significantly reduce the movement resistance, so as to achieve better performance of the whole machine in the deformation section and elbow section in the pipe. The pneumatic rod can be extended and retracted along the axial direction. When the whole machine is deformed, the moving wheel is compressed by the pipe wall and can also rotate around the hinge connected to the support to assist the deformation and recovery of the sealing leather cup.

[0047] The acoustic detection mechanism 3 includes three MEMS microphone arrays arranged in the circumferential direction of the main body 1. Sound-absorbing material is arranged at the MEMS microphone array on the main body 1. The MEMS microphone array is used to collect acoustic signals and store the acoustic signals in a data acquisition card. The sound-absorbing material arranged at the microphone array has the functions of sound absorption, heat insulation and noise reduction. The communication module 5 has a built-in power supply battery to provide power supply and endurance for the whole machine. The data acquisition card is used to collect the acoustic signals received by the microphone array and convert the analog signals into digital signals. The ultra-low frequency transmitter is used to communicate with the ground receiver to realize the positioning of the internal detector.

[0048] An anti-collision mechanism is provided at one end of the main body 1 close to the speed control mechanism 2, and the anti-collision mechanism includes an anti-collision head 6 made of explosion-proof material. The anti-collision head 6 is fixedly installed at one end of the main body 1 through a bracket. The anti-collision head 6 is made of explosion-proof metal or explosion-proof polyurethane material to prevent the internal detector body 1 structure from being damaged when the speed is too fast or when passing through a bend.

[0049] Example 2

[0050] Embodiment 2 is a detection method of Embodiment 1, specifically: a detection method using a detector for detecting inside a buried polyethylene gas pipe as described above, and the specific operation steps are as follows:

[0051] S1. In the valve chamber, place the acoustic detector into the buried polyethylene gas pipe through a portable launch tube;

[0052] S2, the acoustic detector is driven to move by the driving pressure difference formed by the contact and seal between the skirt 401 and the inner wall of the pipe, and the speed control mechanism 2 is used to control the opening of the air inlet 201 to achieve a stable displacement speed of the acoustic detector;

[0053] S3, the acoustic detector moves in the pipeline, collects the sound signal in the pipeline through the acoustic detection mechanism 3, and stores the collected sound signal in the communication mechanism 5;

[0054] S4. The acoustic detector is recovered in the valve chamber through a portable ball collecting tube, and the data in the data acquisition card in the communication mechanism 5 is imported into the computer for data analysis. The sound signal collected by the microphone array is processed to determine whether the pipeline is leaking and the amount of leakage. The pipeline is judged to be leaking by detecting abnormal sound signals. That is, when there is a leak in the pipeline, the turbulence generated in the high-speed shear flow near the leakage hole will cause jet noise, and the turbulence generated by the local discontinuity of the pipe wall caused by the leakage hole will also cause noise. The internal detector continuously collects and stores sound signals as the medium moves. After the detection is completed, it can be determined whether the pipeline is leaking and the amount of leakage by extracting and reconstructing the aliased signal. At the same time, the position information of the internal detector transmitted by the ultra-low frequency transmitter can be used to locate the defect. The adoption of this solution can overcome the problem of the lack of effective health detection means for buried polyethylene gas pipelines. At the same time, it has the advantages of environmental protection, high degree of automation and low cost.

[0055] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A detector for detecting inside buried polyethylene gas pipes, characterized in that: The invention comprises a body (1) having an overall capsule-shaped structure, wherein the body (1) comprises a speed control mechanism (2), an acoustic detection mechanism (3), an auxiliary motion mechanism (4) and a communication mechanism (5) which are sequentially arranged along the axial direction, wherein the acoustic detection mechanism (3) is used to collect sound signals in a pipeline, the auxiliary motion mechanism (4) is used to contact and seal with the inner wall of the pipeline so as to form a pressure difference between the front and rear of the body (1) and drive the body (1) to move in the pipeline, and the communication mechanism (5) is respectively connected to the speed control mechanism (2) and the acoustic detection mechanism (3) for signals and stores the collected sound signals; The speed control mechanism (2) comprises an air inlet (201) arranged at one end of the main body (1) and an air outlet (202) arranged at the other end of the main body (1); the air inlet (201) and the air outlet (202) are connected to each other; the air inlet (201) and the air outlet (202) are used to connect the pressure difference parts of the main body (1) located before and after the auxiliary motion mechanism (4); and an opening adjustment mechanism for controlling the opening of the air inlet (201) is provided on the main body (1).

2. The detector for detecting inside buried polyethylene gas pipes according to claim 1, characterized in that: The opening adjustment mechanism comprises a stopper (203) and a driving mechanism for driving the stopper (203) to move; the baffle is arranged on the body (1) and is used to cooperate with the air inlet (201).

3. A detector for detecting inside buried polyethylene gas pipes according to claim 2, characterized in that: A plurality of air inlets (201) are arranged on the main body (1) along a circumferential direction, and the stoppers (203) are arranged in one-to-one correspondence with the air inlets (201).

4. The detector for detecting inside buried polyethylene gas pipes according to claim 1, characterized in that: The auxiliary movement mechanism (4) comprises a skirt (401) with elastic deformation capability, the skirt (401) being arranged along the circumferential direction of the body (1), and an auxiliary deformation mechanism for controlling the skirt (401) to always contact and seal with the inner wall of the pipe is arranged between the skirt (401) and the body (1).

5. The detector for detecting inside buried polyethylene gas pipes according to claim 4, characterized in that: The auxiliary deformation mechanism comprises a plurality of cylinders (402), wherein the plurality of cylinders (402) are arranged along the circumferential direction of the body (1), one end of the plurality of cylinders (402) is hinged on the body (1), and the other end of the plurality of cylinders (402) is arranged on the skirt (401).

6. The detector for detecting inside buried polyethylene gas pipes according to claim 5, characterized in that: The cylinder (402) is provided with a roller (403) at one end of the skirt (401), the skirt (401) is located between the cylinder (402) and the roller (403), and the roller (403) is used for rolling contact with the inner peripheral wall of the pipeline.

7. A detector for detecting inside buried polyethylene gas pipes according to claim 4, 5 or 6, characterized in that: The plurality of cylinders (402) are arranged along a circular direction and tilted in the same direction.

8. The detector for detecting inside buried polyethylene gas pipes according to claim 1, characterized in that: The acoustic detection mechanism (3) comprises a MEMS microphone array arranged on the body (1), and the communication mechanism (5) comprises a power supply battery, a data acquisition card and an ultra-low frequency transmitter arranged on the body (1), wherein the power supply battery is electrically connected to the data acquisition card and the ultra-low frequency transmitter respectively.

9. The detector for detecting inside buried polyethylene gas pipes according to claim 1, characterized in that: An anti-collision mechanism is provided at one end of the body (1) close to the speed control mechanism (2), and the anti-collision mechanism comprises an anti-collision head (6) made of explosion-proof material.

10. A detection method using a detector for detecting inside a buried polyethylene gas pipe as claimed in any one of claims 1 to 9, characterized in that: The specific steps are as follows: S1. In the valve chamber, the acoustic detector is placed into the buried polyethylene gas pipe through a portable ball launcher; S2, driving the acoustic detector to move by means of a driving pressure difference formed by the contact and sealing between the skirt (401) and the inner wall of the pipe, and then controlling the opening of the air inlet (201) by means of a speed control mechanism (2) to achieve a stable displacement speed of the acoustic detector; S3, the acoustic detector moves in the pipeline, collects the sound signal in the pipeline through the acoustic detection mechanism (3), and stores the collected sound signal in the communication mechanism (5); S4. The acoustic detector is recovered in the valve chamber through a portable ball collecting tube, and the data in the data acquisition card in the communication mechanism (5) is imported into a computer for data analysis. The sound signal collected by the microphone array is processed to determine whether the pipeline is leaking and the amount of leakage.

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