Pipeline blocking device and application thereof

Abstract

The invention discloses a pipeline blocking device and application of the pipeline blocking device in pipeline blocking. The pipeline blocking device comprises a fixer fixedly arranged in a pipeline and hermetically connected with the inner wall of the pipeline; one end of the air bag is hinged with the fixer through a connecting piece A, and the other end of the air bag is connected with the traction rope through a connecting piece B; the other end of the traction rope is connected with traction equipment; one end of the spring device is connected with the connecting piece A, and the other end of the spring device is connected with the fixer; the air pump comprises a valve and is used for supplying air to expand the air bag to block the pipeline and exhausting air to shrink the air bag; and the controller is used for controlling the traction equipment to wind and unwind the traction rope and controlling the starting and stopping conditions of the air pump and the opening and closing conditions of the valve. Parts such as the air bag can be arranged in the pipeline in advance, and quick water plugging and water plugging facility resetting in the pipeline can be achieved when needed.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline blocking, and in particular to a pipeline blocking device and application thereof. Background Art

[0002] With the rapid development of industry and industrial parks, the demand for pipeline blocking measures in water conservancy, municipal administration, environmental protection and other aspects is increasing. In recent years, taking effective measures to block wastewater at pipeline outlets and avoid surface water pollution has received increasing attention. At present, the commonly used blocking measures for pipeline outlets are: pre-installed gate valves on pipelines, temporary blocking inside pipelines, etc.

[0003] The disadvantages of installing gate valves to block water in pipelines include: the project implementation is relatively complex (often involving civil engineering and equipment installation, etc.), and the cost is relatively high.

[0004] The disadvantages of temporarily setting up water-blocking airbags in pipelines include: it is necessary to manually transport temporary blocking materials and equipment from the material storage point to the site, and manually assemble the materials and equipment on site; it takes a long time and the blocking time cannot be guaranteed.

[0005] The patent specification with announcement number CN219796558U discloses a drainage pipe orifice plugging device, including an annular belt arranged on the outside of the pipe wall of the drainage pipe, a support plate is provided on one side of the annular belt, and a fixed plate is provided on the other side, the support plate is connected to the turning plate, the support plate and the turning plate are vertically arranged, one side of the cover plate is connected to the end of the turning plate through a rotating shaft, and a connecting plate is provided on the side of the cover plate away from the turning plate, and the connecting plate is connected to the fixed plate through a connecting mechanism.

[0006] The patent specification with announcement number CN202327504U discloses a temporary pipe plugger, which is mainly composed of an airbag, a gas delivery tube, a valve, and a support plate. The airbag is connected to the gas delivery tube, the gas delivery tube is connected to the valve, and the support plate is arranged between the gas delivery tubes. The patented technology is used to achieve temporary plugging of the pipeline: when in use, select the corresponding model of pipeline plugger according to the pipe diameter, inflate the plugger with an air gun or oxygen, make the airbag close to the pipe wall, and use wire to hang the pull ring on the airbag on the edge of the pipe to prevent the airbag from sliding into the pipe. After use, release the gas through the valve, fold the plugger and place it in the tool box. Summary of the invention

[0007] The present invention provides a pipeline blocking device and its application, wherein components such as air bags can be pre-installed in the pipeline, so as to achieve rapid water blocking in the pipeline and resetting of the water blocking facilities when necessary, and the structure in the pipeline is compactly designed, which has little impact on the pipeline when water is passed.

[0008] The specific technical solutions are as follows: In a first aspect, the present invention provides a pipeline blocking device, comprising: A fixer, used to be fixed in the pipeline and sealed with the inner wall of the pipeline; The air bag is used to be arranged in the pipeline, one end of which is hinged to the fixer through the connector A, and the other end of which is connected to the traction rope through the connector B; the other end of the traction rope is connected to the traction device; A spring device, one end of which is connected to the connector A and the other end of which is connected to the holder, and is used to lower the airbag and pull back to position the airbag when the airbag is inflated; The air pump comprises a 1# air outlet, a 2# air outlet, a 1# air inlet and a 2# air inlet; the 1# air outlet is connected to the air bag through an air pipe, and the air pipe is provided with a valve A, a pressure sensing device and a tee B; the 2# air inlet, the 1# air outlet, the valve A, the pressure sensing device, the tee B and the air bag are connected in sequence to form an air supply pipeline for supplying air to expand the air bag and block the pipeline; the tee B is also connected to the 1# air inlet through the valve B, and the air bag, the tee B, the valve B, the 1# air inlet, the 2# air outlet and the valve C are connected in sequence to form an air extraction pipeline for extracting air to deflate the air bag; The controller is used to control the pulling device to reel in and unreel the traction rope, and to directly control the start and stop of the air pump and the switch of valve A, valve B and valve C according to the data of the pressure sensing device.

[0009] The pipeline blocking device described in the present invention should be understood in a broad sense, that is, the fixture can be first fixed in the pipeline and sealed to the inner wall of the pipeline, and then other component structures can be connected and set on the fixture installed in the pipeline; or the other component structures can be pre-connected with the fixture to form an integrated integral prefabricated product, the size, model, etc. of the product can be adaptively designed and adjusted according to the target pipeline size and type.

[0010] In some preferred examples, the pipeline blocking device is an integrated integral prefabricated product that can be adaptively designed and adjusted according to the size and type of the pipeline.

[0011] In some embodiments, the fixture of the pipeline blocking device can be a fixing patch or a cylindrical structure with two openings at both ends that can fit the inner wall of the pipeline. Furthermore, the airbag, the connector A, the spring device and other component structures can be pre-set in the cylindrical structure.

[0012] In some embodiments, the traction rope of the pipeline blocking device can specifically be a high-strength rope such as a steel wire rope.

[0013] In some embodiments, the pipeline blocking device, the airbag and the spring device may be located on both sides of the connector A respectively.

[0014] The pipeline blocking device may also be provided with a tee A on the air pipe, the tee A is located between the valve A and the tee B, the tee A is connected to a pressure relief pipe, and the pressure relief pipe is provided with a pressure relief valve, which can be used for emergency pressure relief.

[0015] The controller of the pipeline blocking device can be connected to the management and control platform through a data acquisition instrument, and respond in real time to whether to block the pipeline based on the online water quality monitoring data fed back by the management and control platform, while realizing remote control and local control.

[0016] In some embodiments, in the pipeline blocking device, the other end of the traction rope is connected to the pulling device through a tension meter. Further, the controller can be used to control the pulling device to reel in and unreel the traction rope according to the value of the tension meter.

[0017] The pipeline blocking device may further include a power supply for supplying power to the controller, the air pump and the pulling device. Optionally, the power supply is connected to the air pump via a time relay A, and further, the controller may be used to control the start and stop of the air pump according to the value of the time relay A. Optionally, the power supply is connected to the pulling device via a time relay B, and further, the controller may be used to control the pulling device to reel in and unreel the pulling rope according to the value of the time relay B.

[0018] The pipeline blocking device described above can be provided with a wire tube at one end of the pipeline, through which the traction rope and the air pipe pass. A limit protection device is provided on the traction rope between the wire tube and the airbag. The size of the limit protection device is larger than the diameter of the wire tube, and is used to prevent the traction rope from being over-reeled, thereby avoiding damage to the overall structure due to excessive pulling force.

[0019] In the pipeline blocking device, the connector A and the connector B can be independently connected to the airbag through multiple connecting ropes to form a quasi-net structure for supporting the airbag and preventing the airbag from turning over. This type of net structure can not only improve the stability of the overall structure such as the airbag, but also move up and down with the winding and unwinding of the traction rope by the traction device to cooperate with the contraction and expansion of the airbag to achieve resetting and blocking the pipeline. The connecting rope can be made of a high-strength and thin material to ensure that water is not easy to pass between the airbag and the pipe wall when the pipeline is blocked, and to ensure the sealing between the airbag and the inner wall of the pipeline when the pipeline is blocked.

[0020] In the pipeline blocking device, the connector A and the connector B can both be made of hard materials, which can prevent the mesh-like structure and the airbag carried thereon from turning over.

[0021] In a second aspect, the present invention provides use of the pipeline blocking device described in the first aspect in blocking a pipeline.

[0022] When the pipeline blocking device is used to block a pipeline, it includes: Blocking the pipeline: The controller controls the pulling device to unwind the traction rope and lower the airbag to the bottom of the pipeline. During this process, the spring device pulls back the positioning airbag; the controller controls valve A to open, valve B and valve C to close, and the air pump to start, and inflate the airbag through the air pipe. During this process, the spring device pulls back the positioning airbag; the airbag expands to block the pipeline, and then the controller controls valve A and the air pump to close; Airbag reset: The controller controls valve B and valve C to open, and the airbag is deflated. During this process, the controller controls the air pump to start and extract air from the airbag through the air pipe. After the airbag is deflated, the controller controls valve B, valve C and the air pump to close; the controller controls the pulling device to reel in the traction rope and pull the airbag to the top of the pipeline. At this time, the spring device is in a stretched state.

[0023] As a general inventive concept, in a third aspect, the present invention provides a pipeline blocking method, using the pipeline blocking device described in the first aspect, comprising: Blocking the pipeline: The controller controls the pulling device to unwind the traction rope and lower the airbag to the bottom of the pipeline. During this process, the spring device pulls back the positioning airbag; the controller controls valve A to open, valve B and valve C to close, and the air pump to start, and inflate the airbag through the air pipe. During this process, the spring device pulls back the positioning airbag; the airbag expands to block the pipeline, and then the controller controls valve A and the air pump to close; Airbag reset: The controller controls valve B and valve C to open, and the airbag is deflated. During this process, the controller controls the air pump to start and extract air from the airbag through the air pipe. After the airbag is deflated, the controller controls valve B, valve C and the air pump to close; the controller controls the pulling device to reel in the traction rope and pull the airbag to the top of the pipeline. At this time, the spring device is in a stretched state.

[0024] Compared with the prior art, the present invention has the following beneficial effects: When there is no need to block the pipeline, the airbag is positioned at the top of the pipeline to minimize the impact on the pipeline's flow capacity. When the pipeline needs to be blocked, the airbag position is adjusted with the assistance of a spring device to ensure that the airbag's inflation posture does not tilt, thereby achieving effective blocking of the pipeline after the airbag is inflated.

[0025] The controller can control the start and stop of the air pump and the opening and closing of valves A, B and C according to the start signal, data feedback from the pressure sensor, time relay A, etc.; at the same time, it can control the start and stop of the pulling equipment according to the start signal, data feedback from the dynamometer, time relay B, etc.

[0026] The air pump draws air to make the airbag smaller in its deflated state, and the pulling device provides appropriate pulling force so that the airbag can fit tightly against the inner wall of the pipe, minimizing the impact of the deflated airbag on water flow in the pipe under normal circumstances.

[0027] The present invention achieves rapid pipe blocking by pre-buried airbags in the pipeline and information control, while greatly reducing the cost of blocking facilities. Compared with pre-installed gate valves, it avoids or greatly reduces the amount of civil engineering, greatly reduces the construction difficulty and overall cost; compared with temporary plugging, it ensures the timeliness of blocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the pipeline blocking device in a specific implementation manner; Figure 2 It is a structural schematic diagram of a control cabinet in a specific implementation manner; Figure 3 Schematic diagram of an airbag and a mesh-like structure in a specific implementation manner. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0030] See also Figure 1 , Figure 2A pipeline blocking device includes a fixer 21, an air bag 23, a spring device 30 and a control cabinet 1 arranged outside the pipeline. The control cabinet 1 is provided with a controller 2, an air pump 3, a power supply 4 and a pulling device 14. The controller 2 can be specifically a PLC controller. The power supply 4 is connected to the controller 2, the air pump 3 and the pulling device 14 through a power line 12, and is used to power the controller 2, the air pump 3 and the pulling device 14. The power supply 4 is connected to the air pump 3 through a time relay A32, and is connected to the pulling device 14 through a time relay B33. The power supply 4 is preferably connected to the nearby power grid, and then considers battery power, solar power supply, etc. The air pump 3 includes a 1# outlet 17, a 2# outlet 18, a 1# inlet 19 and a 2# inlet 20. The 1# outlet 17 is connected to the charging and discharging interface 22 of the air bag 23 through an air pipe 16, and the air pipe 16 is provided with a valve A5, a pressure sensing device 8, a tee A10 and a tee B11. Tee A10 is located between valve A5 and tee B11. Tee A10 is connected to a pressure relief pipe, on which a pressure relief valve 9 is provided. The pressure relief valve 9 can be a manual-automatic pressure relief valve, which can be used for emergency pressure relief of overpressure. The 2# air inlet 20, the 1# air outlet 17, valve A5, pressure sensing device 8, tee A10, tee B11 and the air charging and discharging interface 22 of the airbag 23 are connected in sequence to form an air supply pipeline for supplying air to expand the airbag 23 and block the pipeline. Tee B11 is also connected to the 1# air inlet 19 through valve B6. The air charging and discharging interface 22 of the airbag 23, tee B11, valve B6, the 1# air inlet 19, the 2# air outlet 18 and valve C7 are connected in sequence to form an exhaust pipeline for exhausting air to deflate the airbag 23. The controller 2 is connected to the control platform through the data acquisition instrument 27, and responds in real time to whether to block the pipeline according to the online water quality monitoring data fed back by the control platform, and realizes remote control and local control at the same time. The controller 2 is connected to the air pump 3, valve A5, valve B6, valve C7, pressure sensing device 8, pulling device 14, tension meter 31, time relay A32, time relay B33 through the signal line 13. The controller 2 can be used to: automatically or manually, directly or indirectly control the start and stop of the air pump 3 and the switch of valve A5, valve B6 and valve C7 according to the start signal, the value of the time relay A32, the data of the pressure sensing device 8, etc.; automatically or manually, directly or indirectly control the pulling device 14 to reel in and unreel the traction rope 15 according to the start signal, the value of the time relay B33, the value of the tension meter 31, etc.

[0031] like Figure 1As shown, the fixture 21 can be pre-fixed in the pipeline and sealed with the inner wall of the pipeline. The fixture 21 can be a metal fixing patch or a cylindrical structure with two ends opened and adapted to the inner wall of the pipeline. The airbag 23 is arranged in the pipeline, one end of which is hinged to the fixture 21 through a connector A28, and the other end is connected to the traction rope 15 through a connector B29. The hinge connection between the connector A28 and the fixture 21 can be achieved by a hinge device, etc. The other end of the traction rope 15 is connected to the pulling device 14 through a dynamometer 31. The traction rope 15 can be a high-strength rope such as a wire rope. One end of the spring device 30 is connected to the connector A28, and the other end is connected to the fixture 21, which is used to lower the airbag 23 and pull back to position the airbag 23 when the airbag 23 is inflated. Moreover, the airbag 23 and the spring device 30 are respectively located on both sides of the connector A28. A wire tube 35 is provided at one end of the pipeline, and the traction rope 15 and the air tube 16 pass through the wire tube 35. A limit protection device 34 is provided on the traction rope 15 located between the wire tube 35 and the airbag 23. The size of the limit protection device 34 is larger than the diameter of the wire tube 35, and is used to prevent the traction rope 15 from being over-reeled, thereby avoiding damage to the overall structure due to excessive pulling force.

[0032] As another feasible implementation, the pipeline blocking device of the present invention can be an integrated integral prefabricated product that can be customized based on pipelines of various sizes and types, that is, the fixture 21 can be pre-connected with the spring device 30 and the airbag 23 and other component structures through the connector A28, and then transferred as a whole to the target pipeline. In this case, the fixture 21 can be a metal fixing patch for sealing against the inner wall of the pipeline, or a cylindrical structure with openings at both ends and sealingly adapted to the inner wall of the pipeline. Furthermore, the airbag 23, connector A28, spring device 30 and other component structures can be pre-set in the cylindrical structure.

[0033] like Figure 3 As shown, the connector A28 and the connector B29 are independently connected to a plurality of connecting ropes 26 at their connecting rope fixing points 25, and the other ends of the connecting ropes 26 are connected to the airbag 23 through the fixing patch 24, forming a quasi-net structure for supporting the airbag 23 and preventing the airbag 23 from turning over. This type of net structure can not only improve the stability of the overall structure such as the airbag 23, but also move up and down with the winding and unwinding of the traction rope 15 by the pulling device 14, so as to cooperate with the contraction and expansion of the airbag 23, and realize the resetting and blocking of the pipeline. The connecting rope 26 can be made of a high-strength and thin material, which can ensure that water is not easy to pass between the airbag 23 and the pipe wall when the pipeline is blocked, and ensure the sealing between the airbag 23 and the inner wall of the pipeline when the pipeline is blocked. Both the connector A28 and the connector B29 can be made of hard materials, which can prevent the quasi-net structure and the airbag 23 carried thereon from turning over.

[0034] The above pipeline blocking device can be used to block pipelines. The time relay A32 is used to set the time parameters to control the start and stop of the air pump 3, which is a double guarantee for the feedback control of the air pump 3 by the pressure sensor device 8. The time relay B33 is used to set the time parameters to control the winding and unwinding of the traction rope 15 by the pulling device 14, which is a double guarantee for the control of the pulling device 14 by the data of the tension meter 31.

[0035] The method for pipeline blocking using the pipeline blocking device comprises: Blocking the pipeline: the controller 2 controls the pulling device 14 to unwind the pulling rope 15 and lower the airbag 23 to the bottom of the pipeline. During this process, the spring device 30 pulls back the positioning airbag 23; the controller 2 controls the valve A5 to open, the valve B6 and the valve C7 to close, and the air pump 3 to start, and inflate the airbag 23 through the air pipe 16. During this process, the spring device 30 pulls back the positioning airbag 23; the airbag 23 expands to block the pipeline, and then the controller 2 controls the valve A5 and the air pump 3 to close; The airbag 23 is reset: the controller 2 controls the valve B6 and valve C7 to open, and the airbag 23 is deflated. During this process, the controller 2 controls the air pump 3 to open and pump air from the airbag 23 through the air pipe 16. After the airbag 23 is deflated, the controller 2 controls the valve B6, valve C7 and air pump 3 to close; the controller 2 controls the pulling device 14 to reel in the pulling rope 15 and pull the airbag 23 to the top of the pipe. At this time, the spring device 30 is in a stretched state, ready for the next rebound. In this way, the airbag 23 can be close to the top of the pipe wall when not in use, ready for the next use.

[0036] The pipeline blocking device of the present invention has the following characteristics: 1. Pre-embedded The airbag used in the present invention is pre-buried in the pipeline, and there is no need to temporarily transport temporary materials and equipment from a material storage point to the site for assembly.

[0037] 2. Automatic response The present invention is a complete set of automatic response water blocking airbags, which can achieve rapid response to pipeline blocking according to abnormal water quality online monitoring data feedback from the information management and control platform, and can completely replace pipeline gate valves, greatly reducing costs.

[0038] The present invention pre-buries the airbag in the pipeline, and realizes the airbag inflation, air pumping and resetting process through an air pump and a traction device, which can realize on-site control and remote operation. Compared with temporary blocking measures, its advantage is instant response, which effectively improves the success rate of pipeline water blocking; compared with gate valve construction, its advantage is low cost and little construction difficulty.

[0039] In addition, it should be understood that after reading the above description of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A pipeline blocking device, characterized in that: include: A fixer (21) is used to be fixed in the pipeline and sealed with the inner wall of the pipeline; An air bag (23) for being arranged in a pipeline, one end of which is hinged to a fixing device (21) via a connecting piece A (28), and the other end of which is connected to a traction rope (15) via a connecting piece B (29); the other end of the traction rope (15) is connected to a traction device (14); A spring device (30), one end of which is connected to the connecting member A (28) and the other end of which is connected to the fixing device (21), and is used to lower the airbag (23) and pull back to position the airbag (23) when the airbag (23) is inflated; The air pump (3) comprises a 1# air outlet (17), a 2# air outlet (18), a 1# air inlet (19) and a 2# air inlet (20); the 1# air outlet (17) is connected to the air bag (23) via an air pipe (16), and the air pipe (16) is provided with a valve A (5), a pressure sensing device (8) and a tee B (11); the 2# air inlet (20), the 1# air outlet (17), the valve A (5), the pressure sensing device (8), The tee B (11) and the air bag (23) are connected in sequence to form an air supply pipeline for supplying air to expand the air bag (23) to block the pipeline; the tee B (11) is also connected to the 1# air inlet (19) through the valve B (6); the air bag (23), the tee B (11), the valve B (6), the 1# air inlet (19), the 2# air outlet (18) and the valve C (7) are connected in sequence to form an air extraction pipeline for extracting air to deflate the air bag (23); The controller (2) is used to control the pulling device (14) to reel in and unreel the pulling rope (15), and to control the start and stop of the air pump (3) and the opening and closing of the valve A (5), valve B (6) and valve C (7) according to the data of the pressure sensing device (8) or directly.

2. The pipeline blocking device according to claim 1, characterized in that: The airbag (23) and the spring device (30) are respectively located on two sides of the connecting member A (28); The pipeline blocking device is an integrated integral prefabricated product that can be adaptively designed and adjusted according to the size and type of the pipeline; The fixer (21) is a fixing patch or a cylindrical structure with openings at both ends and adapted to the inner wall of the pipe; the airbag (23), the connecting piece A (28), and the spring device (30) are all pre-arranged in the cylindrical structure.

3. The pipeline blocking device according to claim 1, characterized in that: The air pipe (16) is also provided with a tee A (10), which is located between the valve A (5) and the tee B (11). The tee A (10) is connected to a pressure relief pipe, and a pressure relief valve (9) is provided on the pressure relief pipe for emergency pressure relief.

4. The pipeline blocking device according to claim 1, characterized in that: The controller (2) is connected to the control platform via the data acquisition instrument (27), and responds in real time to whether to block the pipeline based on the water quality online monitoring data fed back by the control platform, while achieving remote control and local control.

5. The pipeline blocking device according to claim 1, characterized in that: The other end of the traction rope (15) is connected to the traction device (14) via a dynamometer (31); The controller (2) is used to control the pulling device (14) to reel in and unreel the pulling rope (15) according to the numerical value of the tension meter (31).

6. The pipeline blocking device according to claim 1, characterized in that: The pipeline blocking device also includes a power supply (4) for supplying power to the controller (2), the air pump (3) and the pulling device (14); The power supply (4) is connected to the air pump (3) via a time relay A (32), and the controller (2) is used to control the start and stop of the air pump (3) according to the value of the time relay A (32); The power source (4) is connected to the pulling device (14) via a time relay B (33), and the controller (2) is used to control the pulling device (14) to reel in and unreel the pulling rope (15) according to the value of the time relay B (33).

7. The pipeline blocking device according to claim 1, characterized in that: A wire tube (35) is provided at one end of the pipeline, and the traction rope (15) and the air tube (16) pass through the wire tube (35). A limit protection device (34) is provided on the traction rope (15) between the wire tube (35) and the air bag (23). The size of the limit protection device (34) is larger than the diameter of the wire tube (35) and is used to prevent the traction rope (15) from being excessively rolled up.

8. The pipeline blocking device according to claim 1, characterized in that: The connecting member A (28) and the connecting member B (29) are both made of hard materials; The connecting member A (28) and the connecting member B (29) are independently connected to the airbag (23) via a plurality of connecting ropes (26), forming a net-like structure for supporting the airbag (23) and preventing the airbag (23) from turning over.

9. Use of the pipeline blocking device according to any one of claims 1 to 8 in blocking a pipeline.

10. A pipeline blocking method, characterized in that: The pipeline blocking device according to any one of claims 1 to 8 comprises: Blocking the pipeline: the controller (2) controls the pulling device (14) to unwind the pulling rope (15) and lower the airbag (23) to the bottom of the pipeline. During this process, the spring device (30) pulls back the positioning airbag (23); the controller (2) controls the valve A (5) to open, the valve B (6) and the valve C (7) to close, and the air pump (3) to start, and inflate the airbag (23) through the air pipe (16). During this process, the spring device (30) pulls back the positioning airbag (23); the airbag (23) expands to block the pipeline, and then the controller (2) controls the valve A (5) and the air pump (3) to close; The airbag (23) is reset: the controller (2) controls the valve B (6) and the valve C (7) to open, and the airbag (23) is deflated. During this process, the controller (2) controls the air pump (3) to start and draw air from the airbag (23) through the air pipe (16). After the airbag (23) is deflated, the controller (2) controls the valve B (6), the valve C (7) and the air pump (3) to close; the controller (2) controls the pulling device (14) to reel in the pulling rope (15) and pull the airbag (23) to the top of the pipeline. At this time, the spring device (30) is in a stretched state.

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