Gas pipeline detection system

Abstract

The invention relates to the technical field of pipeline detection, in particular to a gas pipeline detection system, which comprises a power supply wire harness, a detection mechanism and a detection point calibration unit, one end of the detection mechanism is provided with a port detection point placement adjustment unit, the transmission end of the port detection point placement adjustment unit is provided with a detection point guide ring, and the detection point guide ring is provided with a detection point. The measuring point guide ring is provided with a plurality of measuring point putting opening and closing sets which are annularly distributed, and the inner side of the measuring point guide ring is fixedly connected with a point marking unit winding recycling assembly; the unlocking transmission motor drives the two-way jacking push head to rotate in the same direction, pushing force is applied to the detection point calibration units to push the outer disengaging face limiting supporting lugs to be unfolded and disengage towards the pipeline elbow, the multiple detection point calibration units can be temporarily retained corresponding to any pipeline elbow connector, temporary calibration of a detection intersection is achieved, and the detection accuracy is improved. During subsequent sound wave detection, it can be avoided that a pipeline intersection point is opened to select a sound wave emission basic position.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline detection, in particular to a gas pipeline detection system. Background Art

[0002] Gas pipelines are mainly composed of pipe fittings, valves and pipe joints. In order to prevent gas pipeline leakage, it is necessary to regularly detect internal damage of the pipeline. The traditional acoustic wave detection system has the following defects, namely, the approximate direction of the pipeline cannot be determined during the detection process, and the elbow interface end cannot be pre-positioned and calibrated according to the direction of the pipeline. After the instrument moves as a whole to the elbow interface end in the pipe, due to the cross-influence of the pipeline, a large signal area will be formed on the ground when the sound wave propagates to this point, causing multiple maximum values ​​in the receiver signal, making it difficult to determine the position of the pipeline. Therefore, continuing to detect along the initial direction is likely to interfere with the direction of the acoustic wave signal, causing the acoustic wave signal to be unable to be correctly received, which in turn affects the normal progress of the detection operation. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a gas pipeline detection system.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a gas pipeline detection system, including a power supply harness, a detection mechanism and a detection point calibration unit, one end of the detection mechanism is provided with a port measuring point placement adjustment unit, the transmission end of the port measuring point placement adjustment unit is installed with a measuring point guide ring, the measuring point guide ring is provided with a plurality of measuring point installation opening and closing groups distributed in an annular shape, the inner side of the measuring point guide ring is fixedly connected with a calibration unit winding point recovery component, the inner side of the measuring point installation opening and closing group is snap-connected with a detection point calibration unit, and the detection point calibration unit reaches the corresponding pipeline bend after , the measuring point installation opening and closing group is used to push the pipe to the bend interface end, and the detection point calibration unit is recovered by the punctuation unit winding point recovery component after completing the calibration operation. The measuring point installation opening and closing group includes an outer detachment surface limiting lug, an unlocking transmission motor and a two-way pushing head. The outer detachment surface limiting lug is rotatably connected to the measuring point guide ring, the outer shell of the unlocking transmission motor is fixedly connected to the measuring point guide ring, the output end of the unlocking transmission motor is fixedly connected to the two-way pushing head, and the punctuation unit winding point recovery component includes a recovery surface response unit and a sheet-shaped electromagnet.

[0005] Preferably, the recovery surface response unit is embedded in the inner side of the measuring point guide ring, the sheet-shaped electromagnet is fixedly connected to the recovery surface response unit, and the sheet-shaped electromagnet is distributed in a ring array along the measuring point guide ring.

[0006] Preferably, the detection point calibration unit includes a recovery shell and a point position marker, the point position marker is fixedly connected to the inner side of the recovery shell, and the recovery shell is snap-connected between the bidirectional pushing head and the outer detachment surface limiting support ear.

[0007] Preferably, the port measuring point placement adjustment unit includes a feed angle adjustment motor and an electric telescopic cylinder, the outer shell of the feed angle adjustment motor is fixedly connected to the detection mechanism, and the output end of the feed angle adjustment motor is fixedly connected to the electric telescopic cylinder.

[0008] Preferably, the output end of the electric telescopic cylinder is rotatably connected to the measuring point guide ring through a recovery rotating motor, and the feed angle adjustment motor and the electric telescopic cylinder are used to adjust the extension length of the detection point calibration unit when it is dropped into the pipe bend interface end.

[0009] Preferably, the measuring point guide ring is provided with a plurality of recovery surface hollow grooves, and the sheet-shaped electromagnet leaks out to the outside of the measuring point guide ring through the recovery surface hollow grooves, and the number of the recovery surface response units, the sheet-shaped electromagnets and the recovery surface hollow grooves is greater than the number of the point position markers.

[0010] Preferably, one end of the measuring point guide ring is fixedly connected to a connecting column head, and a retraction spring is fixedly connected between the outer detachment surface limiting support ear and the connecting column head, and the retraction spring is used to limit the opening and closing angle of the outer detachment surface limiting support ear when the outer detachment surface limiting support ear is not under stress.

[0011] Preferably, the detection mechanism is provided with a power transmission unit, and the power transmission unit is used to provide a power source for the port measuring point placement adjustment unit, the measuring point guide ring, the measuring point installation opening and closing group and the mark unit winding point recovery assembly to transport to the pipeline detection point.

[0012] Preferably, a plurality of sonic radars distributed in a ring array are fixedly connected to one side of the detection mechanism.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The detection mechanism is driven by the power transmission unit to move along the inside of the pipeline. After the port measuring point placement adjustment unit reaches the pipeline bend according to the feedback signal of the acoustic radar, the feed angle adjustment motor controls the electric telescopic cylinder to move along the direction of the acoustic radar response end, and the measuring point guide ring is extended by the electric telescopic cylinder to extend to the inside of the pipeline bend interface. Then, the unlocking transmission motor drives the two-way push head to rotate in the same direction, and applies a driving force to the detection point calibration unit to push the outer detachment surface restriction lug to expand and fall off the pipeline bend, so that multiple detection point calibration units can be temporarily detained at any pipeline bend interface to realize the temporary calibration of the detection intersection, so that the basic position of the sound wave emission can be avoided when opening the pipeline intersection for subsequent sound wave detection.

[0014] 2. After the acoustic wave detection is completed, the power transmission unit can be driven to move to the corresponding bend interface end in the pipeline according to the calibration signal generated by the detection point calibration unit, and then the feed angle adjustment motor is used to control the electric telescopic cylinder to move along the direction of the acoustic wave radar response end, and the electric telescopic cylinder is extended to drive the measuring point guide ring to extend to the inside of the pipeline bend interface. At this time, the outer periphery of the measuring point guide ring corresponds to the inner wall surface of the pipeline, and the measuring point guide ring is driven by the recovery rotating motor to realize circumferential movement, so that the calibration unit revolves around the point recovery component and moves in a circle with the measuring point guide ring to the position of the detection point calibration unit in the pipe, and the detection point calibration unit is adsorbed and positioned, achieving a rapid recovery effect after use. At the same time, the recovery completion information can be triggered by the recovery surface response unit to confirm whether the number of detection point calibration units put in is completely recovered, thereby improving the convenience of secondary use while avoiding the retention of detection point calibration units inside the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention.

[0017] Figure 2 It is a side view of the present invention.

[0018] Figure 3 for Figure 1 Enlarged view of part A in the middle.

[0019] In the figure: 1. Power supply harness; 2. Detection mechanism; 21. Power transmission unit; 22. Acoustic radar; 3. Detection point calibration unit; 31. Recovery shell; 32. Point calibrator; 4. Port measuring point placement adjustment unit; 41. Feed angle adjustment motor; 42. Electric telescopic cylinder; 43. Recovery rotation motor; 5. Measuring point guide ring; 6. Measuring point loading and unloading group; 61. External detachment surface limiting lug; 62. Unlocking transmission motor; 63. Bidirectional push head; 64. Connecting column head; 65. Retraction spring; 7. Marking unit winding point recovery component; 71. Recovery surface response unit; 72. Sheet electromagnet; 73. Recovery surface hollow groove. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] like Figure 1-Figure 3 As shown, a gas pipeline detection system described in the present invention includes a power supply harness 1, a detection mechanism 2 and a detection point calibration unit 3. A port measuring point placement adjustment unit 4 is arranged at one end of the detection mechanism 2. A measuring point guide ring 5 is installed at the transmission end of the port measuring point placement adjustment unit 4. The measuring point guide ring 5 is provided with a plurality of measuring point installation opening and closing groups 6 distributed in an annular shape. A calibration point unit winding point recovery component 7 is fixedly connected to the inner side of the measuring point guide ring 5. The measuring point installation opening and closing group 6 is snap-connected to the inner side of the detection point calibration unit 3. After the detection point calibration unit 3 reaches the corresponding pipeline bend, it is The installation opening and closing group 6 is pushed toward the bend interface end of the pipeline. After the detection point calibration unit 3 completes the calibration operation, it is recovered by the punctuation unit winding point recovery component 7. The measuring point installation opening and closing group 6 includes an outer detachment surface limiting lug 61, an unlocking transmission motor 62 and a two-way pushing head 63. The outer detachment surface limiting lug 61 is rotatably connected to the measuring point guide ring 5, the outer shell of the unlocking transmission motor 62 is fixedly connected to the measuring point guide ring 5, and the output end of the unlocking transmission motor 62 is fixedly connected to the two-way pushing head 63. The punctuation unit winding point recovery component 7 includes a recovery surface response unit 71 and a sheet-shaped electromagnet 72.

[0022] In this embodiment, the recovery surface response unit 71 is embedded inside the measuring point guide ring 5, the sheet-shaped electromagnet 72 is fixedly connected to the recovery surface response unit 71, and the sheet-shaped electromagnet 72 is distributed in a circular array along the measuring point guide ring 5. Among them, the power supply harness 1 can move synchronously with the detection mechanism 2 along the inside of the pipeline for power supply of the entire device.

[0023] In this embodiment, in order to solve the problem that the traditional acoustic wave detection system fails to pre-position and calibrate the bend interface end according to the direction of the pipeline, when affected by the intersection of pipelines, the sound waves propagate to the ground to form a large signal area, making it difficult to determine the position of the pipeline, resulting in the inability to correctly receive the acoustic wave signal. The present invention proposes a gas pipeline detection system, which solves this technical problem by providing a port measuring point placement adjustment unit 4, a measuring point guide ring 5, a measuring point installation opening and closing group 6 and a calibrating unit winding point recovery component 7.

[0024] In this embodiment, in order to ensure that the movement will not be restricted by the pipeline, the measuring point guide ring 5 can be made into a corresponding diameter according to the existing pipeline size, so that the measuring point guide ring 5 can move toward the inside of the pipeline synchronously with the transportation of the power transmission unit 21. Among them, this system also includes a PC end, which is connected to the point calibrator 32 through the PC end signal and receives the calibration signal of the point calibrator 32. The power transmission unit 21 includes a brake motor and a transmission wheel. The transmission wheel is driven by the brake motor to move along the inside of the pipeline. Since this is not the improvement content of the present invention, its technical principle will not be repeated here.

[0025] In an optional implementation of the present embodiment, the detection point calibration unit 3 includes a recovery shell 31 and a point position calibrator 32, the point position calibrator 32 is fixedly connected to the inner side of the recovery shell 31, and the recovery shell 31 is snap-connected between the bidirectional pushing head 63 and the external detachment surface limiting support ear 61.

[0026] In this embodiment, the point calibrator 32 can use a GPS locator. After the point calibrator 32 is placed at the calibration point, the positioning signal of the point calibrator 32 corresponding to the pipeline intersection (i.e., the pipeline bend interface end) is obtained through an external receiver to obtain the location of the pipeline intersection. The recovery shell 31 is made of iron material, and the recovery shell 31 is wrapped around the periphery of the GPS locator to play a protective role. At the same time, the recovery shell 31 can generate magnetic adsorption with the sheet-shaped electromagnet 72, which is used to fix the point calibrator 32 with the sheet-shaped electromagnet 72 when the point calibrator 32 is recovered.

[0027] In an optional implementation of the present embodiment, the port measuring point placement adjustment unit 4 includes a feed angle adjustment motor 41 and an electric telescopic cylinder 42, the outer shell of the feed angle adjustment motor 41 is fixedly connected to the detection mechanism 2, and the output end of the feed angle adjustment motor 41 is fixedly connected to the electric telescopic cylinder 42.

[0028] In an optional implementation of this embodiment, the output end of the electric telescopic cylinder 42 is rotatably connected to the measuring point guide ring 5 through a recovery rotating motor 43, and the feed angle adjustment motor 41 and the electric telescopic cylinder 42 are used to adjust the extension length of the detection point calibration unit 3 when it is dropped into the pipe bend interface end.

[0029] In this embodiment, after the power transmission unit 21 drives the measuring point guide ring 5 to reach the calibration position, the feed angle adjustment motor 41 controls the electric telescopic cylinder 42 to move along the circumferential direction of the detection mechanism 2 until the measuring point guide ring 5 at one end of the electric telescopic cylinder 42 is opposite to the transversely arranged pipeline bend interface, so that the electric telescopic cylinder 42 sends the measuring point guide ring 5 and the detection point calibration unit 3 to the inside of the pipeline bend interface in the same direction, and then the measuring point guide ring 5 and the detection point calibration unit 3 can be pushed into the inside of the pipeline bend interface by the electric telescopic cylinder 42. When the detection point calibration unit 3 is put in, the measuring point guide ring 5 can be driven to rotate by the recovery rotating motor 43, so that the detection point calibration unit 3 currently to be put in rotates to the lowest point, and then the measuring point loading opening and closing group 6 controls the detection point calibration unit 3 to disengage, so that the detection point calibration unit 3 falls to the inside of the pipeline bend interface for temporary position calibration.

[0030] In an optional implementation of the present embodiment, the measuring point guide ring 5 is provided with a plurality of recovery surface hollow grooves 73, and the sheet-shaped electromagnet 72 leaks out to the outside of the measuring point guide ring 5 through the recovery surface hollow grooves 73, and the number of recovery surface response units 71, sheet-shaped electromagnets 72 and recovery surface hollow grooves 73 is greater than the number of point calibrators 32.

[0031] In this embodiment, when the acoustic wave detection is completed and the detection point calibration unit 3 needs to be retracted, the measurement point guide ring 5 can be driven to the pipeline bend interface again by the feed angle adjustment motor 41 and the electric telescopic cylinder 42, and then the recovery rotation motor 43 drives the measurement point guide ring 5 to rotate slowly, and the sheet-shaped electromagnet 72 is electrically conductive, so that the sheet-shaped electromagnet 72 adsorbs the recovery shell 31 due to the magnetic adsorption effect when the measurement point guide ring 5 rotates slowly, and the point calibrator 32 is fixed and recovered. At the same time, after the sheet-shaped electromagnet 72 fixes the detection point calibration unit 3, the recovery surface response unit 71 arranged on the outer periphery of the sheet-shaped electromagnet 72 receives the contact pressure applied by the detection point calibration unit 3 and the sheet-shaped electromagnet 72 after they are fixed, and then according to the triggering number of the recovery surface response unit 71, it can be determined whether the current recovery quantity of the detection point calibration unit 3 is consistent with the delivery of the detection point calibration unit 3.

[0032] In an optional implementation of the present embodiment, a connecting column head 64 is fixedly connected to one end of the measuring point guide ring 5, and a retraction spring 65 is fixedly connected between the external detachment surface limiting support ear 61 and the connecting column head 64. The retraction spring 65 is used to limit the opening and closing angle of the external detachment surface limiting support ear 61 when the external detachment surface limiting support ear 61 is not under stress.

[0033] In this embodiment, the detection point calibration unit 3 is detachably arranged between the outer detachment surface limiting lug 61 and the bidirectional pushing head 63. When the detection point calibration unit 3 is assembled between the outer detachment surface limiting lug 61 and the bidirectional pushing head 63, the two symmetrically arranged outer detachment surface limiting lugs 61 are first pushed in opposite directions to increase the opening and closing angle of the outer detachment surface limiting lugs 61. Then, the recovery shell 31 can be inserted into the inner side of the bidirectional pushing head 63, and then the push on the outer detachment surface limiting lug 61 is released. The outer detachment surface limiting lug 61 is reset by the elastic retraction of the retraction spring 65 connecting the column head 64 and the outer detachment surface limiting lug 61. At this time, the opening and closing angle of the outer detachment surface limiting lug 61 is reduced, so that the outer detachment surface limiting lug 61 and the bidirectional pushing head 63 engage and limit the detection point calibration unit 3, and the installation of the detection point calibration unit 3 is completed.

[0034] In an optional implementation of the present embodiment, the detection mechanism 2 is provided with a power transmission unit 21, which is used to provide a power source for the port measuring point placement adjustment unit 4, the measuring point guide ring 5, the measuring point installation opening and closing group 6 and the mark unit winding point recovery component 7 when transporting to the pipeline detection point. One side of the detection mechanism 2 is fixedly connected to a plurality of acoustic wave radars 22 distributed in a ring array.

[0035] In this embodiment, after the power transmission unit 21 drives the measuring point guide ring 5 to reach the pipeline bend position, the sonic radar 22 and the measuring point guide ring 5 are synchronously placed at the pipeline bend position. At this time, the sonic ranging parameter of the sonic radar 22 increases, and it can be confirmed that the pipeline bend interface end has been reached, and the deployment of the detection point calibration unit 3 is started.

[0036] The working principle of the present invention is: the detection mechanism 2 is driven by the power transmission unit 21 to move along the inside of the pipeline. When it reaches the end of the pipeline bend interface, the feedback ranging parameter of the acoustic radar 22 increases. At this time, the feed angle adjustment motor 41 is controlled by the external PC end, so that the feed angle adjustment motor 41 drives the electric telescopic cylinder 42 to move along the direction of the response end of the acoustic radar 22, and then the measuring point guide ring 5 is extended and driven by the electric telescopic cylinder 42 to extend to the inside of the pipeline bend interface, and then the two-way push pusher 63 is driven by the unlocking transmission motor 62 to rotate in the same direction, and a driving force is applied to the detection point calibration unit 3 to push the outer detachment surface limiting lug 61 to expand and fall off at the pipeline bend, and then the measuring point guide ring 5 is controlled by the electric telescopic cylinder 42 to be retracted as a whole, and the measuring point guide ring 5 is driven to move to the next position by the power transmission unit 21, and the above process is repeated to throw the detection point calibration unit 3 at each bend interface in the pipeline for temporary detention. At this time, the point position calibrator 32 in the detection point calibration unit 3 is used to realize the temporary detection of the intersection. The time calibration can avoid the basic position of selecting the sound wave emission at the intersection of the pipeline during the sound wave detection. After the detection is completed, the power transmission unit 21 can be driven to move to the corresponding bend connection in the pipeline according to the calibration signal generated by the detection point calibration unit 3, and then the electric telescopic cylinder 42 is controlled by the feed angle adjustment motor 41 to move along the direction of the response end of the sound wave radar 22, and the measuring point guide ring 5 is extended to the inside of the pipeline bend interface by the electric telescopic cylinder 42. At this time, the outer periphery of the measuring point guide ring 5 corresponds to the inner wall surface of the pipeline, and the measuring point guide ring 5 is driven by the recovery rotating motor 43 to realize circumferential movement, so that the sheet-shaped electromagnet 72 moves in a circle with the measuring point guide ring 5 to the position of the detection point calibration unit 3 in the pipe, and the detection point calibration unit 3 is adsorbed and positioned, and the recovery completion information is triggered by the recovery surface response unit 71. It can also be confirmed whether the number of detection point calibration units 3 is completely recovered. After complete recovery, the electric telescopic cylinder 42 is controlled to shrink and return to its position, and the detection mechanism 2 is moved out along the inside of the pipeline through the power transmission unit 21.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A gas pipeline detection system, comprising a power supply harness (1), a detection mechanism (2) and a detection point calibration unit (3), characterized in that: A port measuring point placement adjustment unit (4) is provided at one end of the detection mechanism (2); a measuring point guide ring (5) is installed at the transmission end of the port measuring point placement adjustment unit (4); the measuring point guide ring (5) is provided with a plurality of measuring point insertion opening and closing groups (6) distributed in an annular shape; a marking point unit winding point recovery component (7) is fixedly connected to the inner side of the measuring point insertion opening and closing group (6); a detection point calibration unit (3) is snap-connected to the inner side of the measuring point insertion opening and closing group (6); after the detection point calibration unit (3) reaches the corresponding pipeline bend, it is pushed toward the pipeline bend interface end through the measuring point insertion opening and closing group (6); the detection point calibration unit (3) ) After the calibration operation is completed, the punctuation unit winding point recovery component (7) is used for recovery, the measuring point loading and unloading opening and closing group (6) includes an outer detachment surface limiting lug (61), an unlocking transmission motor (62) and a bidirectional pushing head (63), the outer detachment surface limiting lug (61) is rotatably connected to the measuring point guide ring (5), the outer shell of the unlocking transmission motor (62) is fixedly connected to the measuring point guide ring (5), the output end of the unlocking transmission motor (62) is fixedly connected to the bidirectional pushing head (63), and the punctuation unit winding point recovery component (7) includes a recovery surface response unit (71) and a sheet-shaped electromagnet (72).

2. A gas pipeline detection system according to claim 1, characterized in that: The recovery surface response unit (71) is embedded inside the measuring point guide ring (5), the sheet-shaped electromagnets (72) are fixedly connected to the recovery surface response unit (71), and the sheet-shaped electromagnets (72) are distributed in a ring array along the measuring point guide ring (5).

3. A gas pipeline detection system according to claim 2, characterized in that: The detection point calibration unit (3) comprises a recovery shell (31) and a point position calibrator (32), wherein the point position calibrator (32) is fixedly connected to the inner side of the recovery shell (31), and the recovery shell (31) is snap-connected between the bidirectional push-pushing head (63) and the outer detachment surface limiting lug (61).

4. A gas pipeline detection system according to claim 1, characterized in that: The port measurement point placement adjustment unit (4) comprises a feed angle adjustment motor (41) and an electric telescopic cylinder (42); an outer shell of the feed angle adjustment motor (41) is fixedly connected to the detection mechanism (2); and an output end of the feed angle adjustment motor (41) is fixedly connected to the electric telescopic cylinder (42).

5. A gas pipeline detection system according to claim 4, characterized in that: The output end of the electric telescopic cylinder (42) is rotatably connected to the measuring point guide ring (5) via a recovery rotation motor (43), and the feed angle adjustment motor (41) and the electric telescopic cylinder (42) are used to adjust the extension length of the detection point calibration unit (3) when it is dropped into the pipe bend interface end.

6. A gas pipeline detection system according to claim 3, characterized in that: The measuring point guide ring (5) is provided with a plurality of recovery surface hollow grooves (73), and the sheet-shaped electromagnet (72) leaks out to the outside of the measuring point guide ring (5) through the recovery surface hollow grooves (73). The number of the recovery surface response units (71), the sheet-shaped electromagnets (72), and the recovery surface hollow grooves (73) is greater than the number of the point position markers (32).

7. A gas pipeline detection system according to claim 1, characterized in that: A connecting column head (64) is fixedly connected to one end of the measuring point guide ring (5), and a retraction spring (65) is fixedly connected between the outer detachment surface limiting support ear (61) and the connecting column head (64). The retraction spring (65) is used to limit the opening and closing angle of the outer detachment surface limiting support ear (61) when the outer detachment surface limiting support ear (61) is in a non-stressed state.

8. A gas pipeline detection system according to claim 1, characterized in that: The detection mechanism (2) is provided with a power transmission unit (21), and the power transmission unit (21) is used to provide a power source for the port measurement point placement adjustment unit (4), the measurement point guide ring (5), the measurement point installation opening and closing group (6), and the mark unit winding point recovery component (7) when transmitting power to the pipeline detection point.

9. A gas pipeline detection system according to claim 8, characterized in that: A plurality of sonic radars (22) distributed in a ring array are fixedly connected to one side of the detection mechanism (2).

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