Air floating non-invasive clean pipeline welding sealing device

Abstract

The application relates to a gas floating non-damage clean pipeline welding sealing device, and relates to the technical field of pipeline welding. The device is used for solving the problems of the existing pipeline welding technology, such as time-consuming and labor-consuming manual filling, poor effect, poor sealing performance, difficult guarantee of the stability of gas concentration, easy pollution, difficult removal of the filling material, damage to the inner wall and limitation of the bending angle of the welded pipeline, and the problems that the existing sealing device cannot be applied to the welding of a bent pipeline and the inner wall of the pipeline is easily touched during the taking and placing process, causing the pollution and damage of the inner wall of the pipeline. The device comprises a flexible connecting pipe and two sealing piston assemblies, the two sealing piston assemblies are connected through the flexible connecting pipe, the sealing piston assembly comprises a gas bag fixing wheel, a gas bag assembly, a gas floating cavity assembly and a plurality of gas floating arm assemblies, the gas floating cavity assembly is fixedly connected to the middle part of the outer side end face of the gas bag fixing wheel, and the gas floating arm assemblies are fixedly connected to the circumferential side wall of the gas floating cavity assembly in the radial direction. The device is used for clean pipeline welding sealing.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, and specifically to an air-floating non-destructive clean pipeline welding sealing device. Background Technology

[0002] With societal development, higher demands are being placed on industrial technologies across various sectors, and pipeline welding technology, as an indispensable part of the equipment manufacturing industry, is no exception. Welding is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature, or high pressure. To ensure welding quality, inert gases are usually introduced, such as argon for stainless steel pipeline welding. However, directly introducing gas can lead to leaks along the pipeline, not only polluting the pipes but also affecting welding quality due to unstable gas concentrations, resulting in significant waste and endangering human health. Therefore, implementing sealing measures, ensuring clean welding, and preventing damage to the inner surface of the pipeline have become urgent challenges in pipeline welding.

[0003] Currently, two common sealing methods are used for pipe welding: one is to fill with a sponge plug, and the other is to achieve a seal through a specialized sealing device. However, existing pipe welding sealing methods have the following problems:

[0004] The method of sealing the weld seam with sponge plugs has several drawbacks. First, overly tight filling makes the plug difficult to remove, while overly loose filling compromises gas concentration. Furthermore, the plug and gas tend to migrate away from the weld seam, compromising weld quality, causing gas contamination and waste, and increasing removal difficulty. This is especially problematic in long pipe welding, where positioning, sealing, and removal become even more challenging. Second, regardless of the plug material, prolonged friction during use leads to residue shedding, damaging the pipe's inner wall and causing contamination. The need for lubricating grease during removal further contaminates the pipe, hindering clean welding. Additionally, sponge plug sealing is only suitable for straight pipe welds; it results in poor sealing and difficulty in removal for bends and right-angle bends.

[0005] In the method of sealing pipelines using a sealing device, the sealing device is achieved by placing two annular airbags on two brackets, and the two brackets are connected together by a connecting device to achieve a seal on both sides of the weld. This sealing method has a good sealing effect. However, this structure is only suitable for welding straight pipes and cannot be used for welding bent pipes. Its direct insertion method is prone to touching the inner wall of the pipe during the placement and removal of the brackets, especially when welding long pipes, causing contamination and damage to the inner wall of the pipe.

[0006] Therefore, the present invention provides an air-float type non-destructive clean pipeline welding sealing device. Summary of the Invention

[0007] To address the problems of existing pipe welding sealing devices, such as time-consuming and labor-intensive manual filling with poor sealing performance, difficulty in ensuring stable gas concentration, susceptibility to contamination, difficulty in removing the filler, damage to the inner wall, and limitations imposed by the bending angle of the welded pipe, this invention proposes an air-floating, non-destructive, clean pipe welding sealing device.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0009] An air-float type non-destructive clean pipeline welding sealing device includes a flexible connecting pipe and two sealing piston assemblies. The two sealing piston assemblies are symmetrically arranged on both sides of the weld seam inside the welded pipeline, and the two sealing piston assemblies are connected by the flexible connecting pipe.

[0010] The sealing piston assembly includes an airbag fixing wheel, an airbag assembly, an air flotation chamber assembly, and multiple air flotation support arm assemblies. The middle part of the inner end face of the airbag fixing wheel is connected to the end of the flexible connecting tube. An airbag groove is provided on the outer circumferential side wall of the airbag fixing wheel disc. The airbag assembly is disposed in the airbag groove. The air flotation chamber assembly is fixed to the middle part of the outer end face of the airbag fixing wheel. The air flotation support arm assemblies are fixed to the circumferential side wall of the air flotation chamber assembly in the radial direction.

[0011] Furthermore, the interior of the air flotation support arm assembly is connected to the interior of the air flotation chamber assembly, and the interior of the air flotation chamber assembly is connected to the interior of the flexible connecting tube.

[0012] Furthermore, the airbag assembly includes an annular elastic tube and a pneumatic connector. The annular elastic tube is fitted inside the airbag groove, and the pneumatic connector is disposed on the inner circumferential sidewall of the annular elastic tube.

[0013] Furthermore, an air tube through hole is provided on the outer end face of the airbag fixing wheel, and a pneumatic connector is provided corresponding to the air tube through hole.

[0014] Furthermore, the air flotation chamber assembly includes an air flotation chamber, an air flotation chamber end cap, and an air flotation chamber air pipe connector. The air flotation chamber is fixed to the outer end face of the airbag fixing wheel, the air flotation chamber end cap is fixed to the outer end face of the air flotation chamber, and an end cap vent hole is opened in the middle of the air flotation chamber end cap. The inner end of the air flotation chamber air pipe connector is inserted into the end cap vent hole.

[0015] Furthermore, the air flotation chamber is a hollow hexagonal prism with an open outer end face. An air flotation chamber through hole is provided in the middle of the inner end face of the air flotation chamber, and a fixing wheel through hole is provided in the middle of the airbag fixing wheel. The interior of the air flotation chamber is connected to the interior of the flexible connecting tube through the air flotation chamber through hole and the fixing wheel through hole.

[0016] Furthermore, the upper side wall, lower side wall, lower left side wall and lower right side wall of the air flotation chamber are respectively provided with side ridge ventilation holes, and an air flotation support arm assembly is fixed to the outside of each side ridge ventilation hole.

[0017] Furthermore, the air-float support arm assembly includes a cylinder body, an air-float piston support foot, a cylinder body end cap, and a spring. The cylinder body is vertically fixed to the side wall of the air-float chamber outside the side vent hole on the side face. Both ends of the cylinder body are open. The inner end of the cylinder body is connected to the side vent hole on the side face. The cylinder body end cap is fixed to the end face of the outer end of the cylinder body. The middle part of the air-float piston support foot is inserted into the cylinder body end cap. The inner side of the air-float piston support foot is located inside the cylinder body. Two sealing rings are arranged side by side along the length direction on the outer circumferential side wall of the inner side of the air-float piston support foot. The outer side wall of the sealing rings cooperates with the inner circumferential side wall of the cylinder body. A support foot center hole is opened in the middle part of the air-float piston support foot along the length direction. The spring is sleeved on the outer side of the air-float piston support foot and is located between the inner end face of the cylinder body end cap and the outer end face of the outer sealing ring.

[0018] Furthermore, a throttling tube is provided inside the outer end of the center hole of the support leg.

[0019] Furthermore, the outer end of the air-float piston support is provided with a support seat along the circumferential direction.

[0020] The beneficial effects of this invention compared to the prior art are:

[0021] 1. This application eliminates the need for manual filling, resulting in superior sealing, guaranteed gas concentration, ease of use and convenient delivery and removal, and broad applicability, particularly suitable for welding long pipelines. It also effectively avoids friction between the sealing element and the inner wall of the pipeline during sealing, reducing residue from the sealing element and damage to the inner wall, thus preventing contamination of the pipeline. Furthermore, the removal process eliminates the need for lubricating grease, minimizing direct contamination of the pipeline and achieving clean welding.

[0022] 2. This application utilizes a flexible connecting pipe to connect two sealed piston assemblies, enabling the welding of circular pipes with various bending angles, while also meeting the needs of long pipes and improving applicability.

[0023] 3. This application adopts an air-floating support structure, which uses air flotation to send the sealing piston into the pipeline, ensuring that the sealing device will not come into contact with the inner wall of the pipeline during the sending and taking out process, effectively preventing pollution to the inside of the pipeline, and at the same time, it will not cause damage to the inside of the pipeline. It is a clean transportation method that is contactless, frictionless, and damage-free.

[0024] 4. When the device needs to use air flotation, the air flotation support arm assembly can extend and retract, thus avoiding the device from touching the inner wall of the pipe during the welding process and causing scratches. The air flotation support arm assembly provides an air flotation film to achieve contactless, frictionless and damage-free movement of the sealing device relative to the pipe.

[0025] 5. This application increases the robustness of the device within the pipeline by utilizing the expansion and contraction characteristics of the annular elastic tube of the airbag assembly, while also improving the sealing performance of the pipeline welding, ensuring stable gas concentration, improving welding quality, and reducing gas waste. Attached Figure Description

[0026] Figure 1 This is a front view of the overall structure of the present invention;

[0027] Figure 2 This is a side view of the overall structure of the present invention;

[0028] Figure 3 This is a cross-sectional view of the overall structure of the present invention;

[0029] Figure 4 This is a cross-sectional view of the air flotation component in this invention.

[0030] Among them, 1-sealed piston assembly; 1-1-airbag fixing wheel; 1-2-airbag assembly; 1-2-1-circular elastic tube; 1-2-2-pneumatic connector; 1-3-air flotation chamber assembly; 1-3-1-air flotation chamber; 1-3-2-air flotation chamber end cap; 1-3-3-air flotation chamber air pipe connector; 1-4-air flotation support arm assembly; 1-4-1-cylinder body; 1-4-2-air flotation piston support foot; 1-4-3-cylinder body end cap; 1-4-4-spring; 1-4-5-throttle tube; 2-flexible connecting tube. Detailed Implementation

[0031] To make the technical problems solved, the technical solutions, and the beneficial effects of the present invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0032] Specific implementation method one: Combining Figures 1 to 4This embodiment describes an air-float type non-destructive clean pipeline welding sealing device, which includes a flexible connecting pipe 2 and two sealing piston assemblies 1. The two sealing piston assemblies 1 are symmetrically arranged on both sides of the weld seam inside the welded pipeline, and the two sealing piston assemblies 1 are connected by the flexible connecting pipe 2.

[0033] The sealing piston assembly 1 includes an airbag fixing wheel 1-1, an airbag assembly 1-2, an air flotation chamber assembly 1-3, and multiple air flotation support arm assemblies 1-4. The middle part of the inner end face of the airbag fixing wheel 1-1 is connected to the end of the flexible connecting tube 2. An airbag groove is provided on the outer circumferential side wall of the airbag fixing wheel 1-1. The airbag assembly 1-2 is disposed in the airbag groove. The air flotation chamber assembly 1-3 is fixed to the middle part of the outer end face of the airbag fixing wheel 1-1. The air flotation support arm assemblies 1-4 are fixed to the circumferential side wall of the air flotation chamber assembly 1-3 in the radial direction.

[0034] In this embodiment, the airbag assembly 1-2 is installed in the airbag groove to achieve the sealing of the pipe welding and the fixation of the sealing device; the air flotation chamber assembly 1-3 is installed on the end face of the airbag fixing wheel 1-1 away from the weld seam to provide an air passage for the air flotation function; the air flotation support arm assembly 1-4 is installed on the side of the air flotation chamber assembly 1-3 to provide an air film and reaction force for the air flotation component of the device, so as to achieve contactless, frictionless and damage-free transportation.

[0035] The airbag fixing wheel 1-1 has a disc-shaped structure and works in conjunction with the airbag assembly 1-2 to achieve effective sealing between the two sides of the pipe weld.

[0036] When the device needs to use air flotation, the air flotation support arm assembly 1-4 can extend and retract, thus preventing the device from touching the inner wall of the pipe during the welding process and causing scratches. The air flotation support arm assembly 1-4 provides an air flotation film, enabling the sealing device to move relative to the pipe without contact, friction, or damage.

[0037] Specific Implementation Method Two: Combining Figures 1 to 4 In this embodiment, the interior of the air flotation support arm assembly 1-4 is connected to the interior of the air flotation chamber assembly 1-3, and the interior of the air flotation chamber assembly 1-3 is connected to the interior of the flexible connecting pipe 2. The undisclosed technical features in this embodiment are the same as in specific embodiment one.

[0038] Specific implementation method three: Combining Figures 1 to 4 This embodiment describes an airbag assembly 1-2 comprising an annular elastic tube 1-2-1 and a pneumatic connector 1-2-2. The annular elastic tube 1-2-1 is fitted inside the airbag groove, and the pneumatic connector 1-2-2 is disposed on the inner circumferential sidewall of the annular elastic tube 1-2-1. Undisclosed technical features in this embodiment are the same as in specific embodiment one.

[0039] Specific implementation method four: Combination Figures 1 to 4 In this embodiment, the outer end face of the airbag fixing wheel 1-1 is provided with an air tube through hole, and the pneumatic connector 1-2-2 is correspondingly provided with the air tube through hole. The undisclosed technical features in this embodiment are the same as in specific embodiment three.

[0040] The airbag fixing wheel 1-1 has an air pipe through hole on its end face away from the weld, connecting the air circuit control system and the airbag assembly 1-2 to realize the inflation and deflation of the airbag assembly 1-2. The pneumatic connector 1-2-2 is aligned with the air pipe through hole of the airbag fixing wheel 1-1, providing a flexible sealing device that can expand and contract, ensuring a high degree of sealing at the welded part of the pipe and fixing the device in a specific position inside the pipe.

[0041] Specific Implementation Method Five: Combining Figures 1 to 4 This embodiment describes an air flotation chamber assembly 1-3, which includes an air flotation chamber 1-3-1, an air flotation chamber end cap 1-3-2, and an air flotation chamber air pipe connector 1-3-3. The air flotation chamber 1-3-1 is fixed to the outer end face of the airbag fixing wheel 1-1, and the air flotation chamber end cap 1-3-2 is fixed to the outer end face of the air flotation chamber 1-3-1. An end cap vent hole is provided in the middle of the air flotation chamber end cap 1-3-2, and the inner end of the air flotation chamber air pipe connector 1-3-3 is inserted into the end cap vent hole. The undisclosed technical features in this embodiment are the same as in specific embodiment one.

[0042] The air flotation chamber 1-3-1 is installed on the end face of the airbag fixing wheel 1-1 away from the weld seam, providing an air passage for the air flotation assembly. The air flotation chamber end cap 1-3-2 is installed on the end face of the air flotation chamber 1-3-1 away from the weld seam, realizing the closure of the air flotation chamber 1-3-1. The air flotation chamber air pipe connector 1-3-3 is installed in the end cap vent hole of the air flotation chamber end cap 1-3-2, providing an air source for the air flotation function of the device.

[0043] Specific Implementation Method Six: Combination Figures 1 to 4 This embodiment describes an air flotation chamber 1-3-1 that is a hollow hexagonal prism. The outer end face of the air flotation chamber 1-3-1 is open, and a through hole is formed in the middle of the inner end face. A through hole is formed in the middle of the airbag fixing wheel 1-1. The interior of the air flotation chamber 1-3-1 is connected to the interior of the flexible connecting tube 2 through the through holes in the air flotation chamber and the fixing wheel. The undisclosed technical features in this embodiment are the same as in specific embodiment five.

[0044] Specific implementation method seven: Combination Figures 1 to 4In this embodiment, the upper, lower, lower left, and lower right sidewalls of the air flotation chamber 1-3-1 are respectively provided with side-face ventilation holes in their middle portions. An air flotation support arm assembly 1-4 is fixedly connected to the outer side of each side-face ventilation hole. The undisclosed technical features in this embodiment are the same as those in specific embodiment six.

[0045] The air flotation support arm assembly 1-4 is installed in the air flotation chamber 1-3-1, and the upper, lower, lower left and lower right side facets are respectively provided with side facet ventilation holes, which provide a stable air film for the air flotation function of the device and determine the airflow direction and force point.

[0046] Specific implementation method eight: Combination Figures 1 to 4 This embodiment describes an air-float support arm assembly 1-4, which includes a cylinder body 1-4-1, an air-float piston support leg 1-4-2, a cylinder body end cap 1-4-3, and a spring 1-4-4. The cylinder body 1-4-1 is vertically fixed to the side wall of the air-float chamber 1-3-1 outside the side vent hole. Both ends of the cylinder body 1-4-1 are open, and the inner end of the cylinder body 1-4-1 is connected to the side vent hole. The cylinder body end cap 1-4-3 is fixed to the end face of the outer end of the cylinder body 1-4-1. The middle part of the air-float piston support leg 1-4-2 is inserted into the cylinder body end cap. On the cover 1-4-3, the inner side of the air-floating piston support 1-4-2 is set inside the cylinder body 1-4-1. Two sealing rings are arranged side-by-side along the length direction on the outer circumferential side wall of the inner side of the air-floating piston support 1-4-2. The outer side wall of the sealing rings mates with the inner circumferential side wall of the cylinder body 1-4-1. A center hole for the support is opened in the middle of the air-floating piston support 1-4-2 along the length direction. A spring 1-4-4 is fitted on the outer side of the air-floating piston support 1-4-2 and is positioned between the inner end face of the cylinder end cover 1-4-3 and the outer end face of the outer sealing ring. The undisclosed technical features in this embodiment are the same as in specific embodiment seven.

[0047] This embodiment allows the air flotation support arm assembly 1-4 to extend when air flotation is needed and retract otherwise, preventing the device from touching the inner wall of the pipe during welding and causing scratches. The cylinder body 1-4-1 is fixed to the side edge of the air flotation chamber assembly 1-3 with side edge ventilation holes, guiding the extension and retraction of the air flotation piston support leg 1-4-2. The air flotation piston support leg 1-4-2 is installed inside the cylinder body 1-4-1 to achieve the telescopic function. The central hole of the support foot provides an air flotation film, enabling the sealing device to move relative to the pipeline without contact, friction, or damage. The cylinder end cover 1-4-3 is fixed to the other end face of the cylinder 1-4-1. The spring 1-4-4 is installed inside the cylinder 1-4-1, sleeved on the outside of the air flotation piston support foot 1-4-2 rod, and is located between the inner end face of the cylinder end cover 1-4-3 and the outer end face of the outer sealing ring, providing the driving force for the retraction movement of the air flotation piston support foot.

[0048] Specific Implementation Method Nine: Combining Figures 1 to 4 This embodiment describes a throttling tube 1-4-5 located inside the outer end of the center hole of the support leg. The undisclosed technical features in this embodiment are the same as in specific embodiment eight.

[0049] The throttling tube 1-4-5 is installed in the center hole of the support foot of the air flotation piston 1-4-2 on the opposite side end face, realizing the throttling of the small hole and providing a stable air flotation film for the device.

[0050] Specific Implementation Method Ten: Combining Figures 1 to 4 This embodiment describes a method where the outer end of the air-floating piston support 1-4-2 is provided with a support base along the circumferential direction. The undisclosed technical features in this embodiment are the same as in specific embodiment eight.

[0051] The sealing method of the air-float type non-destructive clean pipeline welding sealing device includes the following steps:

[0052] Step 1, Connect to the air circuit control system: Connect the air source to the air float chamber air pipe connector 1-3-3 of the air float chamber assembly 1-3 and the pneumatic connector 1-2-2 of the two airbag assemblies 1-2 through the air pipe. The air pipe connected to the pneumatic connector 1-2-2 has a negative pressure function.

[0053] Step 2, retract the airbag: Activate the negative pressure function of the airbag assembly 1-2 connecting air tube, use the negative pressure to draw out the gas inside the annular elastic tube 1-2-1, reduce its volume and retract it into the airbag groove of the airbag fixing wheel 1-1, and close the negative pressure air path.

[0054] Step 3, activate the air flotation function: turn on the air source connected to the air flotation chamber assembly 1-3, adjust the corresponding air pressure, insert the device into the pipe along the axial direction, and use the air film generated by the air flotation piston support 1-4-2 and the inner wall of the pipe to ensure that the device does not contact the inner wall of the pipe.

[0055] Step 4, Positioning and Fixing: When the weld seam to be welded on the pipeline is in the middle position of the device, the positive pressure gas source connected to the airbag assembly 1-2 is turned on, so that the circular elastic tube 1-2-1 is filled with gas, the volume expands to the tube wall, and the device is fixed in the pipeline. The gas source of the air flotation chamber assembly 1-3 and the airbag assembly 1-2 is turned off, and welding begins.

[0056] Step 5, Remove the device: After welding is completed, the air source of the air flotation chamber assembly 1-3 is connected and the corresponding air pressure is reached. The air flotation piston support 1-4-2 generates a reliable and stable airflow. The negative pressure of the airbag assembly 1-2 is connected. After the circular elastic tube 1-2-1 retracts into the groove of the airbag assembly 1-2, the device is removed along the pipeline axis.

[0057] Furthermore, in step three, before or when the air source is connected to the air flotation chamber assembly 1-3, the air flotation piston support leg 1-4-2 of the air flotation support arm assembly 1-4 is in a retracted state within the cylinder body 1-4-1 under the action of the spring 1-4-4; after the air source is connected to the air flotation chamber assembly 1-3, the air flotation piston support leg 1-4-2 will be overcoming the elastic force of the spring 1-4-4 and extending outward under the action of air pressure. Under the action of the air film between the air flotation piston support leg 1-4-2 and the air film on the inner wall of the pipe, the air flotation piston support leg 1-4-2 will be in a stable extended state.

[0058] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A non-destructive air-floating clean pipeline welding sealing device, characterized in that: It includes a flexible connecting pipe (2) and two sealing piston assemblies (1). The two sealing piston assemblies (1) are symmetrically arranged on both sides of the weld seam inside the pipe to be welded, and the two sealing piston assemblies (1) are connected by the flexible connecting pipe (2). The sealing piston assembly (1) includes an airbag fixing wheel (1-1), an airbag assembly (1-2), an air-float chamber assembly (1-3), and multiple air-float support arm assemblies (1-4). The middle part of the inner end face of the airbag fixing wheel (1-1) is connected to the end of the flexible connecting tube (2). An airbag groove is provided on the outer circumferential side wall of the airbag fixing wheel (1-1). The airbag assembly (1-2) is set in the airbag groove. The air-float chamber assembly (1-3) is fixed to the middle part of the outer end face of the airbag fixing wheel (1-1). The air-float support arm assembly (1-4) is fixed to the circumferential side wall of the air-float chamber assembly (1-3) in the radial direction.

2. The air-float type non-destructive clean pipeline welding sealing device according to claim 1, characterized in that: The interior of the air flotation support arm assembly (1-4) is connected to the interior of the air flotation chamber assembly (1-3), and the interior of the air flotation chamber assembly (1-3) is connected to the interior of the flexible connecting pipe (2).

3. The air-float type non-destructive clean pipeline welding sealing device according to claim 1, characterized in that: The airbag assembly (1-2) includes a circular elastic tube (1-2-1) and a pneumatic connector (1-2-2). The circular elastic tube (1-2-1) is fitted inside the airbag groove, and the pneumatic connector (1-2-2) is located on the inner circumferential side wall of the circular elastic tube (1-2-1).

4. The air-float type non-destructive clean pipeline welding sealing device according to claim 3, characterized in that: The outer end face of the airbag fixing wheel (1-1) is provided with an air pipe through hole, and the pneumatic connector (1-2-2) is provided correspondingly to the air pipe through hole.

5. The air-float type non-destructive clean pipeline welding sealing device according to claim 1, characterized in that: The air flotation chamber assembly (1-3) includes an air flotation chamber (1-3-1), an air flotation chamber end cap (1-3-2), and an air flotation chamber air pipe connector (1-3-3). The air flotation chamber (1-3-1) is fixed to the outer end face of the airbag fixing wheel (1-1). The air flotation chamber end cap (1-3-2) is fixed to the outer end face of the air flotation chamber (1-3-1). An end cap vent hole is opened in the middle of the air flotation chamber end cap (1-3-2). The inner end of the air flotation chamber air pipe connector (1-3-3) is inserted into the end cap vent hole.

6. The air-float type non-destructive clean pipeline welding sealing device according to claim 5, characterized in that: The air flotation chamber (1-3-1) is a hollow hexagonal prism. The outer end face of the air flotation chamber (1-3-1) is open. An air flotation chamber through hole is opened in the middle of the inner end face of the air flotation chamber (1-3-1). A fixing wheel through hole is opened in the middle of the airbag fixing wheel (1-1). The interior of the air flotation chamber (1-3-1) is connected to the interior of the flexible connecting tube (2) through the air flotation chamber through hole and the fixing wheel through hole.

7. The air-float type non-destructive clean pipeline welding sealing device according to claim 6, characterized in that: The upper, lower, lower left and lower right side walls of the air flotation chamber (1-3-1) are respectively provided with side ridge ventilation holes, and an air flotation support arm assembly (1-4) is fixed to the outside of each side ridge ventilation hole.

8. The air-float type non-destructive clean pipeline welding sealing device according to claim 7, characterized in that: The air-float support arm assembly (1-4) includes a cylinder body (1-4-1), an air-float piston support leg (1-4-2), a cylinder body end cap (1-4-3), and a spring (1-4-4). The cylinder body (1-4-1) is vertically fixed to the side wall of the air-float chamber (1-4-1) outside the side vent hole. Both ends of the cylinder body (1-4-1) are open. The inner end of the cylinder body (1-4-1) is connected to the side vent hole. The cylinder body end cap (1-4-3) is fixed to the end face of the outer end of the cylinder body (1-4-1). The middle part of the air-float piston support leg (1-4-2) is inserted into the cylinder body end cap (1-4-4). On the cylinder body (1-4-1), the inner side of the air-floating piston support (1-4-2) is set inside the cylinder body (1-4-1). Two sealing rings are arranged side by side along the length direction on the outer circumferential side wall of the inner side of the air-floating piston support (1-4-2). The outer side wall of the sealing ring is matched with the inner circumferential side wall of the cylinder body (1-4-1). The middle part of the air-floating piston support (1-4-2) has a support center hole along the length direction. The spring (1-4-4) is fitted on the outer side of the air-floating piston support (1-4-2) and is located between the inner end face of the cylinder end cover (1-4-3) and the outer end face of the outer sealing ring.

9. The air-float type non-destructive clean pipeline welding sealing device according to claim 8, characterized in that: A throttling tube (1-4-5) is provided inside the outer end of the center hole of the support leg.

10. The air-float type non-destructive clean pipeline welding sealing device according to claim 8, characterized in that: The outer end of the air-float piston support (1-4-2) is provided with a support seat along the circumferential direction.

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