CN218032695U - Pressure pipeline leakage detection device - Google Patents

Abstract

The utility model relates to a pipeline under pressure leak testing device, include: the automatic sealing type air pump comprises an outer pipe travelling mechanism, an air pump, an air pressure sensor, an automatic sealing type jacket and a controller, wherein the automatic sealing type jacket is arranged on the outer pipe travelling mechanism, an air suction port is formed in the automatic sealing type jacket, the air pump is communicated with the air suction port in the automatic sealing type jacket, the air pressure sensor is arranged on the inner ring of the automatic sealing type jacket, and the outer pipe travelling mechanism, the air pump, the air pressure sensor and the automatic sealing type jacket are respectively and electrically connected with the controller. The beneficial effects are that: adopt machinery to detect the pipeline leakage and can reduce artifical participation degree, lifting efficiency reduces intensity of labour simultaneously, and in addition, whole device can walk on the pipeline to need not carry out dismouting work at every welding department, also can promote work efficiency to a certain extent.

Description

Pressure pipeline leakage detection device

Technical Field

The utility model relates to a pipeline under pressure detection area, concretely relates to pipeline under pressure leak testing device.

Background

The pressure pipeline is a pipeline bearing internal pressure and external pressure, and for long-distance gas transportation, the pipeline is generally implemented by laying the pressure pipeline, and due to the fact that the distance is long, the pipeline is composed of multiple sections, adjacent sections are spliced in a welding mode, in the long-term use process, the splicing part is easy to damage and leak gas, whether gas leakage occurs is generally checked section by section through manpower, the pipeline is long, time is consumed, and meanwhile manual detection is also laborious.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a pipeline under pressure leak testing device is provided to overcome not enough among the above-mentioned prior art.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a pressure line leak detection device, comprising: the automatic sealing type air pump comprises an outer pipe travelling mechanism, an air pump, an air pressure sensor, an automatic sealing type jacket and a controller, wherein the automatic sealing type jacket is arranged on the outer pipe travelling mechanism, an air suction port is formed in the automatic sealing type jacket, the air pump is communicated with the air suction port in the automatic sealing type jacket, the air pressure sensor is arranged on the inner ring of the automatic sealing type jacket, and the outer pipe travelling mechanism, the air pump, the air pressure sensor and the automatic sealing type jacket are respectively and electrically connected with the controller.

The utility model has the advantages that: when the automatic sealing type pipeline leakage detection device is applied, the external pipe travelling mechanism is fixed on a pipeline to be detected, when the external pipe travelling mechanism travels outside the pipeline, the automatic sealing type jacket can be driven to move along with the external pipe travelling mechanism, when the external pipe travelling mechanism moves to a welding point of the pipeline, the external pipe travelling mechanism pauses and embraces the pipeline by the automatic sealing type jacket, a sealed cavity is formed between the automatic sealing type jacket and the pipeline, a part to be detected is positioned in the cavity, partial gas in the cavity is pumped out by an air pump, then the air pumping pauses, the current initial pressure value is detected by an air pressure sensor, the initial pressure value is fed back to a controller by the air pressure sensor, the preset time of the state is kept, the air pressure sensor feeds back the pressure value to the controller again, the controller compares the two pressure values to judge whether the leakage occurs at the position, if the leakage does not occur at the position, the controller controls the automatic sealing type jacket to be opened, the air pressure sensor to reset, meanwhile, the controller controls the external pipe travelling mechanism to continue travelling on the pipeline to travel, when the pipeline is moved to the welding point at the next position, the working process is repeated, and the process is analogized in sequence, the whole process can reduce the manual participation degree, and the labor intensity, and the working degree of the whole welding device can be improved, and the working efficiency of each welding position can be improved.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the self-sealing type jacket includes: the sealing device comprises a first arc-shaped clamping plate, a second arc-shaped clamping plate, a sealing strip and a moving mechanism, wherein the first arc-shaped clamping plate and the second arc-shaped clamping plate are oppositely arranged to form a complete circular ring; two sealing strips are arranged on the inner surface of the first arc-shaped clamping plate, and two ends of the sealing strips arranged on the inner surface of the first arc-shaped clamping plate respectively extend to two end faces of the first arc-shaped clamping plate; two sealing strips are arranged on the inner surface of the second arc-shaped clamping plate, and two ends of the sealing strips arranged on the inner surface of the second arc-shaped clamping plate respectively extend to two end faces of the second arc-shaped clamping plate; the moving mechanism is arranged on the pipe external walking mechanism; the first arc-shaped clamping plate and the second arc-shaped clamping plate are respectively connected with the moving mechanism, are controlled by the moving mechanism to be close to each other to form a complete circular ring, and are controlled by the moving mechanism to be far away from each other.

Adopt above-mentioned further beneficial effect to do: the pipeline can be automatically clasped and loosened so as to complete the detection work and transfer the next position for detection.

Furthermore, the two ends of the first arc-shaped clamping plate and the second arc-shaped clamping plate are spliced in a staggered joint mode.

Adopt above-mentioned further beneficial effect to do: make the piece department of first arc splint and second arc splint stagger to promote leakproofness and stability, and promote the detection precision of whole device.

Further, an air pressure sensor and an air suction opening are arranged in the area between the two sealing strips on the first arc-shaped clamping plate.

Further, the moving mechanism includes: the lead screw, a pedestal, the guide bar, first slider, second slider and servo motor, lead screw and guide bar parallel arrangement, the both ends of lead screw are rotated with the base respectively and are connected, the both ends of guide bar are connected with the base respectively, have two sections screw thread sections that revolve to opposite on the lead screw, first slider and second slider revolve respectively on two sections screw thread sections that revolve to opposite on the lead screw, servo motor sets up on the base, servo motor's main shaft is connected with the one end of lead screw, the guide bar runs through first slider and second slider, servo motor is connected with the controller electricity, first arc splint and second arc splint are fixed mutually with first slider and second slider respectively.

Adopt above-mentioned further beneficial effect to do: the first arc-shaped clamping plate and the second arc-shaped clamping plate can be synchronously driven to be close to and away from each other so as to complete the holding and loosening of the pipeline, and the stability is good.

Further, outside of tubes running gear includes: frame, walking wheel, actuating mechanism, supplementary landing leg and auxiliary wheel, walking wheel rotate and set up in frame top below, and actuating mechanism sets up at the frame top, and actuating mechanism rotates for the walking wheel of drive, and the both sides of frame all set up supplementary landing leg, and the lower extreme of supplementary landing leg sets up the auxiliary wheel.

Adopt above-mentioned further beneficial effect to do: the formed whole structure can be clamped on the pipeline, so that the external pipe walking mechanism is prevented from falling off the pipeline, and walking work on the pipeline is facilitated.

Further, the auxiliary wheel is a universal wheel.

Adopt above-mentioned further beneficial effect to do: can be better contacted with the pipeline, so that the whole external pipe walking mechanism can walk on the pipeline more stably.

Further, still include the vision sensor, the vision sensor sets up on the walking mechanism outside the tubes, and the vision sensor is connected with the controller electricity.

Adopt above-mentioned further beneficial effect to do: the vision sensor can gather the image on pipeline surface, then transmits for the controller, and the controller can judge whether for the pipeline welding department according to the image, supplementary foretell position record mode, and two kinds of modes combine together can fix a position more accurately to the welding department, further promote the intelligent degree of whole device.

And the outer pipe walking mechanism is provided with a spraying marking device which is electrically connected with the controller.

Adopt above-mentioned further beneficial effect to do: when the detection device detects that the pressure value at a certain position of the pipeline is abnormal, the spraying marking device can be started to carry out spraying marking on the pipeline, so that the working personnel can subsequently know that the section is abnormal.

Furthermore, the device also comprises a positioning device and a communication module which are respectively electrically connected with the controller.

Adopt above-mentioned further beneficial effect to do: when the detection device detects that the pressure value at a certain position of the pipeline is abnormal, the positioning device can send the current position information to the user side through the controller and the communication module, so that the user can quickly know the abnormal position.

Drawings

Fig. 1 is a first perspective view of the pressure pipe leakage detecting device of the present invention;

fig. 2 is a second perspective view of the pressure pipe leakage detecting device according to the present invention;

fig. 3 is a front view of the pressure pipe leakage detecting device of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the device comprises an external pipe travelling mechanism, 110, a frame, 120, travelling wheels, 130, a driving mechanism, 140, auxiliary supporting legs, 150, auxiliary wheels, 2, an air suction pump, 3, an air pressure sensor, 4, an automatic sealing type jacket, 410, a first arc-shaped clamping plate, 420, a second arc-shaped clamping plate, 430, a sealing strip, 440, a moving mechanism, 441, a screw rod, 442, a base, 443, a guide rod, 444, a first sliding block, 445, a second sliding block, 446, a servo motor, 5, a controller, 6, a visual sensor, 7, a spraying marking device, 8, a positioning device, 9 and a communication module.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

As shown in fig. 1 to 3, a pressure pipe leakage detection apparatus includes: the device comprises an external pipe walking mechanism 1, an air extracting pump 2, an air pressure sensor 3, an automatic sealing type jacket 4 and a controller 5; the external pipe walking mechanism 1 is a mechanism capable of automatically walking outside the pipeline; the automatic sealing type jacket 4 is arranged on the outer pipe travelling mechanism 1, and when the outer pipe travelling mechanism 1 travels outside a pipeline, the automatic sealing type jacket 4 can be driven to move along with the pipeline, so that pressure tests can be performed on different positions in the follow-up process;

the automatic sealing type jacket 4 is provided with an air suction port, the air suction pump 2 is communicated with the air suction port on the automatic sealing type jacket 4, when the automatic sealing type jacket 4 clamps a pipeline to-be-tested part, such as a welding part of two pipelines, a sealed cavity is formed between the automatic sealing type jacket 4 and the pipelines, the to-be-tested part is positioned in the cavity, partial gas in the cavity is sucked by the air suction pump 2, so that the pressure is changed, whether air leakage exists or not is tested by the air pressure sensor 3 subsequently, a valve can be arranged between an inlet of the air suction pump 2 and the air suction port, after the partial gas in the cavity is sucked by the air suction pump 2, the valve is closed to block the air suction pump 2 from continuing to suck air, when the valve is opened, the air can continue to suck air by the air suction pump 2, the valve can select an electric control valve or a one-way valve, the air pressure sensor 3 is arranged on the inner ring of the automatic sealing type jacket 4, the air pressure sensor 3 is used for detecting the air pressure value in the cavity, the signal input of the traveling mechanism 1 outside the pipe is electrically connected with the signal output of the controller 5, the signal input of the air suction pump 2 is electrically connected with the signal output of the controller 5, the controller, the signal output of the air pressure sensor 3 is electrically connected with the signal input of the automatic sealing type jacket 4 electrically connected with the signal of the controller 5.

When the device is applied, the external pipe walking mechanism 1 is fixed on a pipeline to be detected, when the external pipe walking mechanism 1 walks outside the pipeline, the automatic sealing type jacket 4 can be driven to move along, when the external pipe walking mechanism 1 moves to a welding point of the pipeline, the external pipe walking mechanism 1 stops and the pipeline is held by the automatic sealing type jacket 4, a sealed cavity is formed between the automatic sealing type jacket 4 and the pipeline, a part to be detected is positioned in the cavity, partial gas in the cavity is pumped out through the air pump 2, then air pumping is stopped, the current initial pressure value is measured through the air pressure sensor 3, the initial pressure value is fed back to the controller 5 by the air pressure sensor 3, the state is kept for a preset time (the time can be set according to actual requirements), the air pressure sensor 3 feeds back the pressure value to the controller 5 again, the controller 5 compares the two pressure values (the comparison can be that whether the two pressure values are the same or not, or not is in a preset deviation range, the controller 5 only needs to carry out some simple comparison work to judge whether the leakage occurs at the position exists or not, if no, the controller 5 controls the automatic sealing type jacket 4 to be opened, the external pipe walking mechanism 1 to be controlled to move to the position corresponding to the welding position, and then the pipeline to be controlled to be paved, and the whole pipeline to be detected, and the whole pipeline can be controlled in advance, and the pipeline to be detected, and the pipeline can be paved, and the pipeline can be controlled in the pipeline to be detected, and the whole pipeline, and the pipeline can be controlled in the pipeline to be detected, and the pipeline can be controlled in the pipeline to be detected, and the pipeline to be paved in the pipeline to be detected, and the position in the position corresponding position in the position in advance, therefore, the disassembly and assembly work is not required to be carried out at each welding position, and the working efficiency can be improved to a certain degree.

Example 2

As shown in fig. 1 to fig. 3, this embodiment is a further improvement on embodiment 1, and specifically includes the following steps:

the self-sealing type jacket 4 includes: a first arc-shaped clamping plate 410, a second arc-shaped clamping plate 420, a sealing strip 430 and a moving mechanism 440; the first arc-shaped clamping plate 410 and the second arc-shaped clamping plate 420 are oppositely arranged to form a complete circular ring, preferably, the first arc-shaped clamping plate 410 and the second arc-shaped clamping plate 420 are both semicircular, and the size of the inner ring of the circular ring formed by the first arc-shaped clamping plate 410 and the second arc-shaped clamping plate 420 is determined according to the outer diameter of the pressure pipeline to be detected; two sealing strips 430 are arranged on the inner surface of the first arc-shaped clamping plate 410, and two ends of the sealing strips 430 arranged on the inner surface of the first arc-shaped clamping plate 410 respectively extend to two end surfaces of the first arc-shaped clamping plate 410; two sealing strips 430 are arranged on the inner surface of the second arc-shaped clamping plate 420, and two ends of the sealing strips 430 arranged on the inner surface of the second arc-shaped clamping plate 420 respectively extend to two end faces of the second arc-shaped clamping plate 420; when the first arc-shaped clamping plate 410 and the second arc-shaped clamping plate 420 are combined into a complete ring, the two sealing strips 430 on the inner surface of the first arc-shaped clamping plate 410 and the two sealing strips 430 on the inner surface of the second arc-shaped clamping plate 420 are combined into two annular sealing rings, while the cavity described in embodiment 1 is located between the two annular sealing rings, and the moving mechanism 440 is arranged on the pipe outside travelling mechanism 1; the first arc-shaped clamping plate 410 and the second arc-shaped clamping plate 420 are respectively connected with the moving mechanism 440, are controlled by the moving mechanism 440 to approach each other to form a complete ring, and are controlled by the moving mechanism 440 to separate from each other, and approach each other during detection, and separate from each other during detection position replacement so as not to influence the movement.

Example 3

As shown in fig. 1 to fig. 3, the present embodiment is a further improvement on embodiment 2, and specifically includes the following steps:

the equal stagger joint concatenation in both ends of first arc splint 410 and second arc splint 420, the stagger joint concatenation can let the piece department of first arc splint 410 and second arc splint 420 stagger to promote leakproofness and stability, thereby promote the detection precision of whole device.

Example 4

As shown in fig. 1, this embodiment is a further improvement on embodiment 2 or 3, and specifically includes the following steps:

the area between two sealing strips 430 on the first arc-shaped clamping plate 410 is provided with the air pressure sensor 3 and an air suction opening, and the thickness of the air pressure sensor 3 is smaller than that of the sealing strips 430, so that the work of the air pressure sensor 3 is not influenced.

Example 5

As shown in fig. 1 to 3, this embodiment is a further improvement on any one of embodiments 1 to 4, and specifically includes the following steps:

the moving mechanism 440 includes: the screw 441, the base 442, the guide rod 443, the first slider 444, the second slider 445, and the servo motor 446; the screw mandrel 441 and the guide rod 443 are arranged in parallel, two ends of the screw mandrel 441 are respectively rotatably connected with the base 442, and two ends of the guide rod 443 are respectively connected with the base 442; the screw rod 441 has two threaded sections with opposite rotation directions, such as a forward threaded section and a backward threaded section, the first slider 444 and the second slider 445 are respectively screwed on the two threaded sections with opposite rotation directions of the screw rod 441, for example, the first slider 444 and the second slider 445 are respectively screwed on the forward threaded section and the backward threaded section, the first slider 444 and the second slider 445 are both located below the base 442, the servo motor 446 is disposed on the base 442, a main shaft of the servo motor 446 is connected with one end of the screw rod 441, when the servo motor 446 is activated, the screw rod 441 is rotated, assuming that the screw rod 441 rotates in the forward direction, the first slider 444 and the second slider 445 are close to each other, when the screw rod 441 rotates in the backward direction, the first slider 444 and the second slider 445 are far away from each other, which is a part of the prior art, the guide rod 443 penetrates through the first slider 444 and the second slider 445, a signal input of the servo motor 446 is electrically connected with a signal output of the controller 5, and an upper end of the first arc-shaped clamping plate 410 is fixed with the first slider 444, specifically: the upper end of the first arc-shaped clamping plate 410 is fixed with the first sliding block 444 through a bolt, and the second arc-shaped clamping plate 420 is fixed with the second sliding block 445, which specifically can be: the upper end of the second arc-shaped clamping plate 420 is fixed with the second sliding block 445 through a bolt; of course, in the actual design process, it is not excluded that the moving mechanism 440 is formed by two telescopic rods, and piston rods of the two telescopic rods are respectively fixed to the first arc-shaped clamping plate 410 and the second arc-shaped clamping plate 420, so that the first arc-shaped clamping plate 410 and the second arc-shaped clamping plate 420 are close to and away from each other through the telescopic action of the two telescopic rods.

Example 6

As shown in fig. 1 to 3, this embodiment is a further improvement on any one of embodiments 1 to 5, and specifically includes the following steps:

the outside-pipe running gear 1 includes: a frame 110, a road wheel 120, a driving mechanism 130, an auxiliary leg 140 and an auxiliary wheel 150;

the road wheel 120 is rotatably disposed below the top of the frame 110, the driving mechanism 130 is disposed at the top of the frame 110, the driving mechanism 130 is connected to the road wheel 120, the driving mechanism 130 is configured to drive the road wheel 120 to rotate, and the driving mechanism 130 may generally be: motor and driving chain, the motor is then fixed at frame 110 top, the main shaft of motor passes through the driving chain and links to each other with the main shaft of walking wheel 120, the driving chain can be gear drive, chain drive or belt drive, of course, actuating mechanism 130 can also contain the reduction gear, and the reduction gear input shaft links to each other with the main shaft of motor, and the output shaft of reduction gear links to each other with the driving chain, the both sides of frame 110 all set up supplementary landing leg 140, the lower extreme of supplementary landing leg 140 sets up auxiliary wheel 150, the whole structure that forms can press from both sides on the pipeline, thereby avoid outside of tubes running gear 1 to drop from the pipeline.

Example 7

As shown in fig. 1 to fig. 3, this embodiment is a further improvement on embodiment 6, and specifically includes the following steps:

the auxiliary wheel 150 is preferably a universal wheel, and can be better contacted with the pipeline, so that the whole walking mechanism 1 outside the pipeline can walk on the pipeline more stably.

For example 6 or 7, the upper end of the auxiliary leg 140 may be fixedly connected to the frame 110 by a bolt, or may be connected to the frame in other manners, for example, the upper end of the auxiliary leg 140 is provided with a rotating shaft, two ends of the rotating shaft are respectively rotatably matched with the frame 110, the rotating shaft is provided with a torsion spring, an inward force may be applied to the auxiliary leg 140 by a torsion force of the torsion spring, and the auxiliary leg 140 is matched with the auxiliary wheel 150 to enable the pipe external walking mechanism 1 to be better clamped on a pipeline, and when the pipe external walking mechanism 1 needs to be taken off from the pipeline, the auxiliary leg 140 is taken off outwards to enable the auxiliary leg 140 to be disengaged from the pipeline, and is unfolded outwards by a certain angle, so that the pipe external walking mechanism 1 can be directly taken off from the pipeline; of course, a tension spring may be used instead of the torsion spring, and the tension spring is disposed inside the auxiliary leg 140, one end of the tension spring is hooked on the auxiliary leg 140, and the other end of the tension spring is hooked on the frame 110, and the same effect may also be achieved.

Example 8

As shown in fig. 1 to 3, this embodiment is a further improvement on any one of embodiments 1 to 7, and specifically includes the following steps:

pressure pipeline leakage detection device still includes vision sensor 6, vision sensor 6 sets up on outer pipe running gear 1, vision sensor 6's signal output is connected with controller 5's signal input electricity, vision sensor 6 can gather the image on pipeline surface, then transmit for controller 5, controller 5 can judge whether for pipeline tailor welding (welding) department according to the image, image recognition technology is prior art, supplementary foretell position record mode, two kinds of modes combine together can be more accurate to the welding department location, can promote the intelligent degree of whole device, vision sensor 6 can also not be used for the welding department discernment of course, but gather pipeline circumstances or pipeline condition around the pipeline.

Example 9

As shown in fig. 1 to fig. 3, the present embodiment is a further improvement on any one of embodiments 1 to 8, and specifically includes the following steps:

the pressure pipeline leakage detection device further comprises a spraying marking device 7, the spraying marking device 7 is arranged on the pipe outer travelling mechanism 1, the signal input of the spraying marking device 7 is electrically connected with the signal output of the controller 5, when the detection device detects that the pressure value at a certain position of the pipeline is abnormal, the spraying marking device 7 can be started to carry out spraying marking on the pipeline, so that a worker knows that the section is abnormal, and the spraying marking device 7 can be as follows: storage tank and automatically controlled valve, the splendid attire liquid material in the storage tank, the lower extreme of storage tank sets up the discharge gate, and automatically controlled valve setting is in the discharge gate of storage tank, and through the switch of control automatically controlled valve, whether can control the material in the storage tank to flow out, and certainly still can be for other structures, do not do here and make clear and definite restriction.

Example 10

As shown in fig. 1 to fig. 3, this embodiment is a further improvement on embodiment 9, and specifically includes the following steps:

pressure pipeline leakage detection device still includes positioner 8 and communication module 9, positioner 8's signal output is connected with the signal input electricity of controller 5, communication module 9 then with controller 5 both-way communication, namely the user end can be through communication module 9 to controller 5 send instruction, and controller 5 can send corresponding signal for the user end through communication module 9, when detection device detects out that pipeline somewhere pressure value is unusual, positioner 8 can pass through controller 5 with current position information, send for the user end behind the communication module 9, so that the user learns unusual department fast, communication module 9 can adopt the 3G communication, 4G communication or 5G communication, positioner 8 can adopt GPS location, big dipper location etc..

For the above embodiments, the controller 5 may be a PLC controller commonly used in the art.

The utility model discloses in, owing to there are many electrical parts, so carry on power supply in step on the running gear 1 outside the tubes, provide the required electric energy of work for each electrical part through power supply.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A pressure line leak detection device, comprising: the device comprises an external pipe travelling mechanism (1), an air suction pump (2), an air pressure sensor (3), an automatic sealing type jacket (4) and a controller (5), wherein the automatic sealing type jacket (4) is arranged on the external pipe travelling mechanism (1), an air suction opening is formed in the automatic sealing type jacket (4), the air suction pump (2) is communicated with the air suction opening in the automatic sealing type jacket (4), the air pressure sensor (3) is arranged on the inner ring of the automatic sealing type jacket (4), and the external pipe travelling mechanism (1), the air suction pump (2), the air pressure sensor (3) and the automatic sealing type jacket (4) are respectively and electrically connected with the controller (5).

2. A pressure pipe leak detection device, as defined in claim 1, wherein: the self-sealing jacket (4) comprises: the sealing device comprises a first arc-shaped clamping plate (410), a second arc-shaped clamping plate (420), a sealing strip (430) and a moving mechanism (440), wherein the first arc-shaped clamping plate (410) and the second arc-shaped clamping plate (420) are oppositely arranged to be combined into a complete circular ring; two sealing strips (430) are arranged on the inner surface of the first arc-shaped clamping plate (410), and two ends of the sealing strips (430) arranged on the inner surface of the first arc-shaped clamping plate (410) respectively extend to two end faces of the first arc-shaped clamping plate (410); two sealing strips (430) are arranged on the inner surface of the second arc-shaped clamping plate (420), and two ends of the sealing strips (430) arranged on the inner surface of the second arc-shaped clamping plate (420) respectively extend to two end faces of the second arc-shaped clamping plate (420); the moving mechanism (440) is arranged on the pipe external walking mechanism (1); the first arc-shaped clamping plate (410) and the second arc-shaped clamping plate (420) are respectively connected with the moving mechanism (440), are controlled by the moving mechanism (440) to approach each other to form a complete ring, and are controlled by the moving mechanism (440) to move away from each other.

3. A pressure pipe leak detection device, according to claim 2, characterized in that: the two ends of the first arc-shaped clamping plate (410) and the second arc-shaped clamping plate (420) are spliced in a staggered way.

4. A pressure pipe leak detection device, according to claim 2, characterized in that: an air pressure sensor (3) and an air suction opening are arranged in the area between the two sealing strips (430) on the first arc-shaped clamping plate (410).

5. A pressure line leak detection device according to claim 2, wherein: the moving mechanism (440) comprises: the screw rod (441), the base (442), the guide rod (443), the first slider (444), the second slider (445) and the servo motor (446), the screw rod (441) and the guide rod (443) are arranged in parallel, two ends of the screw rod (441) are respectively connected with the base (442) in a rotating manner, two ends of the guide rod (443) are respectively connected with the base (442), two threaded sections with opposite rotating directions are arranged on the screw rod (441), the first slider (444) and the second slider (445) are respectively screwed on the two threaded sections with opposite rotating directions of the screw rod (441), the servo motor (446) is arranged on the base (442), a main shaft of the servo motor (446) is connected with one end of the screw rod (441), the guide rod (443) penetrates through the first slider (444) and the second slider (445), the servo motor (446) is electrically connected with the controller (5), and the first arc clamping plate (410) and the second arc clamping plate (420) are respectively fixed with the first slider (445) and the second arc clamping plate (445).

6. A pressure pipe leak detection device, as defined in claim 1, wherein: the pipe external walking mechanism (1) comprises: frame (110), walking wheel (120), actuating mechanism (130), supplementary landing leg (140) and auxiliary wheel (150), walking wheel (120) rotate to set up frame (110) top below, actuating mechanism (130) set up frame (110) top, actuating mechanism (130) are used for the walking wheel of driven (120) to rotate, the both sides of frame (110) all set up supplementary landing leg (140), the lower extreme of supplementary landing leg (140) sets up auxiliary wheel (150).

7. A pressure line leak detection device according to claim 6, wherein: the auxiliary wheel (150) is a universal wheel.

8. A pressure pipe leakage detection apparatus according to any one of claims 1 to 7, wherein: still include vision sensor (6), vision sensor (6) set up on the walking mechanism (1) outside of tubes, vision sensor (6) with controller (5) electricity is connected.

9. A pressure line leak detection apparatus according to any one of claims 1 to 7, wherein: the device is characterized by further comprising a spraying and marking device (7), wherein the spraying and marking device (7) is arranged on the pipe outer walking mechanism (1), and the spraying and marking device (7) is electrically connected with the controller (5).

10. A pressure pipe leak detection device, according to claim 9, wherein: the device is characterized by further comprising a positioning device (8) and a communication module (9), wherein the positioning device (8) and the communication module (9) are electrically connected with the controller (5) respectively.

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