Argon filling plugging device for welding and plugging method

Abstract

The invention discloses an argon filling plugging device for welding. The plugging device comprises two supporting frames and an air bag plugging assembly. The supporting frame comprises a central supporting piece, a supporting arm and a driving device; the supporting arm comprises a fixed arm and a movable arm connected to the fixed arm in a sliding mode, and a ball supported through a first elastic piece is arranged in a limiting groove in the end of the movable arm. The driving device comprises a supporting shaft, a driving sleeve, a fine adjustment piece and a driving rod. The two ends of the driving rod are hinged to the movable arm and the fine adjustment piece respectively. A sliding line of the fine adjustment part is parallel to a moving line of the driving sleeve, and a telescopic first blocking part and a fixed second blocking part are arranged on the driving sleeve along the sliding line of the fine adjustment part; the first blocking piece is remotely controlled through a pull rope. The plugging device is used for solving the technical problem that an existing plugging device is not prone to being pulled out due to large friction force after welding is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline welding, and in particular relates to an argon filling plugging device and a plugging method for welding. Background Art

[0002] For thermal power generation, improving the operating parameters of the unit and the development of supercritical and ultra-supercritical units are important research directions today. Among the main components of supercritical and ultra-supercritical units, P92 steel is widely used in steam pipes, superheaters and reheaters. During the processing of P92 steel pipes, the segmented pipes need to be connected by welding, and argon arc welding is often used for welding. During the argon arc welding process, argon gas needs to be filled in the pipe to avoid other reactions caused by the metal in the welding area coming into contact with the air, so as to obtain a higher quality welding effect.

[0003] The prior art discloses a patent application with the patent name "A welding argon-filled plugging device", application number 202022308859.2, and authorization announcement date 2021.06.29, including an I-shaped plug and moisturizing cotton. The moisturizing cotton is fixedly arranged on both sides of the I-shaped plug, and the maximum outer diameter of the I-shaped plug is smaller than the inner diameter of the pipe to be welded, the outer diameter of the moisturizing cotton is not smaller than the inner diameter of the pipe to be welded, and an air inlet nozzle is arranged on one side edge of the I-shaped plug; the welding argon-filled plugging device described in the present invention can use the I-shaped plug and moisturizing cotton to form a sealed cavity in the area to be welded, and then use the inflation nozzle to fill the sealed cavity with argon of a certain pressure. Compared with the existing method of filling the entire pipeline with argon, it greatly saves the amount of argon filled and reduces the production cost.

[0004] However, in the above-mentioned prior art, when the plugging device is removed after welding, the friction between the moisturizing cotton and the inner wall of the pipe is large, and it is difficult to pull it out. At the same time, the moisturizing cotton is also easy to scratch the inner wall of the pipe, affecting the quality of the pipe. Therefore, a new plugging device is urgently needed to solve the above problems. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an argon-filled plugging device and a plugging method for welding, which are used to solve the technical problem that the current plugging device is difficult to be pulled out due to large friction after welding.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: an argon-filling plugging device for welding, which comprises two support frames and an airbag plugging assembly for plugging a pipeline, which is detachably connected to the two support frames; The support frame includes a central support member, at least three telescopic support arms, and a driving device for driving the support arms to telescope; The support arms are evenly arranged along the circumference of the central support member; The support arm comprises a fixed arm and a movable arm slidably connected to the fixed arm, and a ball supported by a first elastic member is arranged in a limiting groove at the end of the movable arm; The driving device comprises a support shaft rotatably connected to the central support member, a driving sleeve threadedly connected to the support shaft, a fine-tuning member slidably connected to the driving sleeve, and a driving rod, wherein both ends of the driving rod are respectively hinged to the movable arm and the fine-tuning member; The sliding line of the fine-tuning member is parallel to the moving line of the driving sleeve. A retractable first stopper and a fixed second stopper are arranged on the driving sleeve along the sliding line of the fine-tuning member. The first stopper extends to stop the fine-tuning member and retracts to release the fine-tuning member. The first stopper is located on a side of the second stopper close to the support arm. The first stopper is remotely controlled by a pull cord; The first stopper is slidably connected to a countersunk hole arranged on the driving sleeve, and a second elastic member is arranged at the bottom of the countersunk hole to support the first stopper, so as to realize the extension and retraction of the first stopper.

[0007] The argon filling and sealing device for welding is described as follows: a through hole parallel to the central axis of the driving sleeve is arranged near the bottom of the countersunk hole, a connecting hole is arranged between the bottom of the countersunk hole and the through hole, a pull rope is connected to the bottom of the first stopper, and the other end of the pull rope passes through the through hole, so that the first stopper can be remotely driven by the pull rope.

[0008] In the argon-filling plugging device for welding, the pull rope is split into two and passes through the two ends of the through hole respectively.

[0009] In the argon-filling plugging device for welding, a guide roller is arranged in the through hole, and the pull rope extends from the countersunk hole to the through hole and then bypasses the guide roller to realize the turning of the pull rope.

[0010] In the argon-filling plugging device for welding, the fine-tuning part adopts a fine-tuning sleeve, and the fine-tuning sleeve is sleeved on the driving sleeve to drive multiple driving rods at the same time.

[0011] The argon-filled sealing device for welding, the driving device also includes at least two limit rods connected to the central support member, the limit rods are parallel to the support shaft; the limit rods pass through the driving sleeve to achieve a sliding connection.

[0012] The argon-filled sealing device for welding has a connecting pipe between the two airbag sealing components, and a pressure valve is provided on the connecting pipe; a threaded sleeve that cooperates with the thread of the support shaft is provided at the center of one airbag sealing component, and a non-threaded sleeve with a smooth inner wall is provided at the center of the other airbag sealing component, which can be loosely mounted on the support shaft.

[0013] The argon-filling plugging device for welding has the airbag plugging component of the non-threaded sleeve, and a connecting ear is provided on the airbag plugging component for connecting with the corresponding drawstring.

[0014] In the argon-filled plugging device for welding, the two airbag plugging components are connected by a telescopic rod.

[0015] A method for sealing a welding argon-filled sealing device, the method comprising the following steps: (1) Place the support frame in two pipes to be welded, rotate the support shaft, move the drive sleeve and extend the movable arm through the drive rod. The end of the movable arm is pressed against the inner wall of the pipe in a surface contact manner to increase the friction surface and improve the support stability. (2) Connect an extension rope to the pull ring and extend the extension rope out of the pipe to pull out the support frame after welding is completed; (3) Connect the two airbag blocking components to the two support frames respectively, inflate them to achieve blocking, and then weld them; (4) After welding is completed, the annular airbag is deflated, and the first stopper is remotely controlled to shrink by pulling the extension rope. Under the rebound action of the first elastic member, the movable arm is pushed, and then the fine-tuning member is pushed to move toward the second stopper; (5) At this time, the ball supports the inner wall of the pipe. The rolling of the ball reduces the friction between the ball and the pipe wall, making it easier to pull out the support frame. During the entire pulling process, the support frame is supported on the inner wall of the pipe, and there will be no skewing or jamming problems, making it smoother to pull out. Beneficial Effects

[0016] 1. The present invention supports two support frames in two pipes near the ends that need to be welded, rotates the support shaft relative to the driving sleeve, moves the driving sleeve relative to the support shaft, and under the driving action of the driving rods hinged at both ends, the movable arm extends relative to the fixed arm, and the end of the movable arm presses against the inner wall of the pipe to achieve support (at this time, the ball at the end of the movable arm shrinks in the limiting groove due to pressure, and the first elastic member is in a compressed state), and two airbag sealing assemblies are respectively connected to the two support frames, and sealing is achieved by inflating the airbag sealing assemblies, and argon gas is filled between the two airbag sealing assemblies to reduce the influence of air on welding.

[0017] 2. After welding is completed, the airbag sealing assembly of the present invention is deflated and shrunk, and the first stopper is remotely controlled to shrink through the pull rope, and the stopping effect on the fine-tuning part is lost. Under the action of the rebound force of the first elastic part, the movable arm shrinks relative to the fixed arm, and the fine-tuning part moves relative to the driving sleeve to the position of the second stopper (away from the support arm). At this time, the ball is supported on the side wall of the pipe, and the support frame is still in a supporting state. However, since the ball can rotate relative to the side wall of the pipe to reduce friction, the support frame can be pulled out with less force, and the support frame is always in a state of supporting the pipe wall during the pulling-out process, avoiding the phenomenon of skewing and jamming, making it easier to remove the sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of an embodiment of an argon filling and plugging device for welding; Figure 2 It is a cross-sectional schematic diagram of a support frame of an embodiment of an argon-filling plugging device for welding; Figure 3 for Figure 2 The enlarged schematic diagram at A in the middle; Figure 4 for Figure 2 The enlarged schematic diagram of point B in the middle; Figure 5 The figure is a side view of an airbag plugging component of an embodiment of an argon-filled plugging device for welding.

[0019] in, Figure 1-5 In the figure, 1-support arm, 11-fixed arm, 12-movable arm, 121-limiting groove, 122-ball, 123-first elastic member, 2-center support ring, 21-bearing assembly, 3-driving device, 31-support shaft, 32-limiting rod, 33-driving sleeve, 331-first stopper, 332-countersunk hole, 333-second elastic member, 334-through hole, 335-pull rope, 336-pull ring, 337-second stopper, 34-fine-tuning member, 35-driving rod, 4-air bag sealing assembly, 41-sealing disk, 42-annular air bag, 43-air inlet, 44-non-threaded sleeve, 45-connecting ear, 46-threaded sleeve, 5-connecting pipe, 6-pressure valve, 7-telescopic rod. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and do not limit the scope of the present invention.

[0021] Specific implementation method 1, as Figure 1-5As shown, an argon-filled plugging device for welding includes two support frames and two airbag plugging assemblies 4. The support frame is used to support the end of the pipeline close to the end to be welded, and provide support and positioning for the airbag plugging assembly 4. The two airbag plugging assemblies 4 are detachably connected to the two support frames, and after the support frames are connected to the pipeline, the airbag plugging assemblies 4 are connected respectively, and the airbag plugging assemblies 4 are inflated to achieve the plugging of the pipeline, and argon gas is filled between the two airbag plugging assemblies 4 for protection.

[0022] The support frame includes a central support member, a support arm 1 and a drive device 3. The support arm 1 is of a retractable type, at least three of which are arranged evenly along the circumference of the central support member and perpendicular to the connecting surface. The support arm 1 includes a fixed arm 11 connected to the central support member and a movable arm 12 slidably connected to the fixed arm 11. A limiting groove 121 is provided at the end of the movable arm 12, and a ball 122 is supported in the limiting groove 121 by a first elastic member 123; a limiting ring is provided at the opening of the limiting groove 121 to limit the ball 122 to prevent it from falling out, and to allow the ball 122 to be partially exposed. In this embodiment, four support arms 1 are provided; the first elastic member 123 adopts a compression spring.

[0023] In this embodiment, the central support member is a central support ring 2, so that the support arms 1 are evenly arranged in the circumferential direction thereon.

[0024] The driving device 3 includes a support shaft 31, a driving sleeve 33, a fine-tuning member 34 and a driving rod 35. The support shaft 31 is rotatably connected to the central support ring 2 through a bearing assembly 21 and is coaxially arranged with the central support ring 2. The driving sleeve 33 is connected to the support shaft 31 by threaded engagement, and the relative rotation of the two enables the driving sleeve 33 to move along the support shaft 31. The fine-tuning member 34 is slidably connected to the driving sleeve 33, and its sliding line is parallel to the moving line of the driving sleeve 33. One end of the driving rod 35 is hinged to the fine-tuning member 34, and the other end is hinged to the movable arm 12, so that when the driving sleeve 33 approaches the support arm 1, the fine-tuning member 34 is driven to approach the support arm 1, and the movable arm 12 is pushed to extend under the action of the driving rod 35, and when the driving sleeve 33 moves away from the support arm 1, the fine-tuning member 34 is driven away from the support arm 1, and the movable arm 12 is retracted under the action of the driving rod 35. A first stopper 331 and a second stopper 337 are also provided on the driving sleeve 33 along the sliding line of the fine-tuning member 34, and the first stopper 331 is provided on the side of the second stopper 337 close to the support arm 1. The second stopper 337 is a fixed style. The first stopper 331 is a retractable style, and when it is extended, it stops the fine-tuning member 34, and when it is retracted, it releases the fine-tuning member 34. In addition, the extension and retraction of the first stopper 331 can be remotely controlled by pulling up 335.

[0025] In this embodiment, the fine-tuning member 34 is a fine-tuning sleeve, which is sleeved on the driving sleeve 33, and multiple driving rods 35 are hinged on the fine-tuning sleeve to achieve synchronous driving of the multiple driving rods 35. Accordingly, two first stoppers 331 can be provided in symmetrical positions, or can be provided according to the number and corresponding positions of the driving rods 35; the second stopper 337 is an annular protrusion provided at the end of the driving sleeve 33, and the structure is simpler.

[0026] It should be noted that the fine-tuning member 34 moves between the first stop member 331 and the second stop member 337 , and the movable arm 12 driven by the fine-tuning member 34 is formed to be smaller than the height that the ball 122 can penetrate into the limiting groove 121 .

[0027] Furthermore, a countersunk hole 332 is provided on the driving sleeve 33 , the first stopper 331 is slidably connected in the countersunk hole 332 , and a second elastic member 333 is provided between the bottom of the countersunk hole 332 and the first stopper 331 to achieve the extension and retraction of the first stopper 331 .

[0028] Furthermore, a through hole 334 is provided at a position near the central axis of the driving sleeve 33 at the bottom of the counterbore 332, and the through hole 334 is parallel to the central axis of the driving sleeve 33. A connecting hole is provided between the bottom of the counterbore 332 and the through hole 334, and a pull rope 335 is connected to the bottom of the first stopper 331. The pull rope 335 passes through the connecting hole and enters the through hole 334, and passes out from the end of the through hole 334, and is connected to a pull ring 336 at the passed end. Based on this, the pull rope 335 is tightened by the pull ring 336, and the pull rope 335 pulls the first stopper 331 to shrink into the counterbore 332, and after the pull ring 336 loses external force, the first stopper 331 extends outward under the rebound action of the second elastic member 333, so that the extension and retraction of the first stopper 331 can be remotely controlled by connecting an extension rope to the pull ring 336 and extending it out of the welding pipe. Furthermore, after the first stopper 331 contracts, the first elastic member 123 pushes the movable arm 12 to contract under the action of the rebound force, and the ball 122 is exposed from the limiting groove 121 and pressed against the pipe wall.

[0029] Furthermore, a guide roller is provided in the through hole 334 at a position aligned with the countersunk hole 332. The pull rope 335 extends from the countersunk hole 332 to the through hole 334 and then bypasses the guide roller, thereby realizing the turning of the pull rope 335 and making it easier to pull the rope 335.

[0030] Furthermore, the driving device 3 further includes at least two limiting rods 32. The limiting rods 32 are vertically connected to the central support ring 2 and are parallel to the support shaft 31. The limiting rods 32 pass through the driving sleeve 33 to complete the sliding connection. Based on this, when the support shaft 31 is rotated, the driving sleeve 33 will not rotate with the support shaft 31 under the limiting action of the limiting rods 32, and the driving sleeve 33 can move along the support shaft 31.

[0031] Furthermore, the airbag plugging assembly 4 includes a plugging disk 41 and an annular airbag 42. The annular airbag 42 is sealed and connected to the outer edge of the plugging disk 41, and an air inlet 43 is provided on the annular airbag 42. The two annular airbags 42 are connected through a connecting pipe 5, and a pressure valve 6 is provided on the connecting pipe 5. Based on this, the two annular airbags 42 can be inflated by inflating through one of the air inlets 43. After the pressure reaches a certain value, the pressure valve 6 opens to inflate the space between the two airbag plugging assemblies 4 to protect the welding.

[0032] In order to facilitate the removal of the airbag sealing assembly 4 out of the pipeline, a threaded sleeve 46 is set at the center position of one of the sealing disks 41, which is threadedly connected to the support shaft 31, and a non-threaded sleeve 44 with a smooth inner wall is set at the center position of the other sealing disk 41, which can be loosely sleeved on the support shaft 31. With such a configuration, when the device needs to be removed, the annular airbag 42 is deflated and the support frame is pulled out by the extension rope, wherein the support frame connected by the threaded sleeve 46 directly pulls out the airbag sealing assembly 4, and the non-threaded sleeve 44 is detached from the support frame when the other support frame is pulled out.

[0033] Furthermore, the two sealing disks 41 are connected by a telescopic rod 7. When the support frame is pulled out, the two deflated airbag sealing assemblies 4 will not come into contact with the inner wall of the pipe under the support of the telescopic rod 7, thereby avoiding wear; and after the two support frames and the two airbag sealing assemblies 4 are installed, when aligning the pipes to be welded, the telescopic rod 7 can facilitate the adjustment of the distance between the two airbag sealing assemblies 4 without affecting the use.

[0034] When using the argon-filled plugging device for welding in this embodiment, the support frame is placed in two pipes to be welded, the support shaft 31 is rotated, the drive sleeve 33 moves and the movable arm 12 is extended through the drive rod 35. The end of the movable arm 12 is pressed against the inner wall of the pipe in a surface contact manner to increase the friction surface and improve the support stability. An extension rope is connected to the pull ring 336 and extended out of the pipe where it is located, so as to pull out the support frame after welding is completed. The two airbag plugging assemblies 4 are connected to the two support frames respectively, and then inflated to achieve plugging, and welding can be performed; and the annular airbag 42 is deflated after welding is completed. By pulling the extension rope, the first stopper 331 is remotely controlled to retract, and under the rebound action of the first elastic member 123, the movable arm 12 is pushed, and then the fine-tuning member 34 is pushed to move toward the second stopper 337. At this time, the ball 122 supports the inner wall of the pipe. The ball 122 can roll to reduce the friction between the pipe wall, making it easier to pull out the support frame. During the entire pulling-out process, the support frame is supported on the inner wall of the pipe, and there will be no skewing or jamming problems, making it smoother to pull out.

[0035] It should be noted that the present embodiment is suitable for the scenario where the ends of the two pipes to be welded can be conveniently extended with extension ropes to facilitate pulling out the two support frames from two directions respectively.

[0036] Specific implementation method 2: Figure 1-5 As shown, an argon-filled sealing device for welding is different from the specific embodiment one in that the pull rope 335 is split into two, and after entering the through hole 334, it extends out from the two ends of the through hole 334 respectively, and a connecting ear 45 is provided on the sealing disk 41 with a non-threaded sleeve 44. When in use, the connecting ear 45 is connected to the pull ring 336 of the support frame on that side, and the pull ring 336 of the other support frame is connected to the extension rope and extends out of the pipeline. When pulling out the sealing device, the support frame on that side is pulled by the extension rope, and the support frame drives the airbag sealing assembly 4 to move, and the airbag sealing assembly 4 pulls out the other support frame through the connection between the connecting ear 45 and the pull ring 336 on the other support frame. Other structures are not repeated here.

[0037] It should be noted that this embodiment is applicable to pipelines that need to be welded, where the other end of one of the pipelines is not convenient for extending the extension rope of the support frame, and two support frames are simultaneously pulled out from the same side through an extension rope.

[0038] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An argon-filling plugging device for welding, characterized in that: The device comprises two support frames and an air bag plugging assembly for plugging the pipeline, which is detachably connected to the two support frames; The support frame includes a central support member, at least three telescopic support arms, and a driving device for driving the support arms to telescope; The support arms are evenly arranged along the circumference of the central support member; The support arm comprises a fixed arm and a movable arm slidably connected to the fixed arm, and a ball supported by a first elastic member is arranged in a limiting groove at the end of the movable arm; The driving device comprises a support shaft rotatably connected to the central support member, a driving sleeve threadedly connected to the support shaft, a fine-tuning member slidably connected to the driving sleeve, and a driving rod, wherein both ends of the driving rod are respectively hinged to the movable arm and the fine-tuning member; The sliding line of the fine-tuning member is parallel to the moving line of the driving sleeve. A retractable first stopper and a fixed second stopper are arranged on the driving sleeve along the sliding line of the fine-tuning member. The first stopper extends to stop the fine-tuning member and retracts to release the fine-tuning member. The first stopper is located on a side of the second stopper close to the support arm. The first stopper is remotely controlled by a pull cord; The first stopper is slidably connected to a countersunk hole arranged on the driving sleeve, and a second elastic member is arranged at the bottom of the countersunk hole to support the first stopper, so as to realize the extension and retraction of the first stopper.

2. The argon-filling plugging device for welding according to claim 1 is characterized in that: A through hole parallel to the central axis of the drive sleeve is arranged near the bottom of the countersunk hole, a connecting hole is arranged between the bottom of the countersunk hole and the through hole, a pull rope is connected to the bottom of the first stopper, the other end of the pull rope passes through the through hole, and the first stopper is remotely driven by the pull rope.

3. The argon-filling plugging device for welding according to claim 2 is characterized in that: The drawstring is split into two and passes through the two ends of the through hole respectively.

4. The argon-filling plugging device for welding according to claim 3 is characterized in that: A guide roller is arranged in the through hole, and the pull rope extends from the countersunk hole to the through hole and then bypasses the guide roller to realize the turning of the pull rope.

5. The argon-filling plugging device for welding according to claim 4 is characterized in that: The fine-tuning member adopts a fine-tuning sleeve, and the fine-tuning sleeve is sleeved on the driving sleeve to drive a plurality of driving rods at the same time.

6. The argon-filling plugging device for welding according to claim 5 is characterized in that: The driving device further comprises at least two limiting rods connected to the central supporting member, wherein the limiting rods are parallel to the supporting shaft; the limiting rods pass through the driving sleeve to achieve sliding connection.

7. The argon-filling plugging device for welding according to claim 6 is characterized in that: A connecting pipe is passed between the two airbag sealing components, and a pressure valve is arranged on the connecting pipe; a threaded sleeve matching with the thread of the support shaft is arranged at the center of one airbag sealing component, and a non-threaded sleeve with a smooth inner wall is arranged at the center of the other airbag sealing component, which can be loosely mounted on the support shaft.

8. The argon-filling plugging device for welding according to claim 7 is characterized in that: The airbag blocking assembly with the non-threaded sleeve is provided with a connecting ear for connecting with a corresponding drawstring.

9. The argon-filling plugging device for welding according to claim 8, characterized in that: The two airbag blocking components are connected via a telescopic rod.

10. A plugging method using the welding argon filling plugging device according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: (1) Place the support frame in two pipes to be welded, rotate the support shaft, move the drive sleeve and extend the movable arm through the drive rod. The end of the movable arm is pressed against the inner wall of the pipe in a surface contact manner to increase the friction surface and improve the support stability. (2) Connect an extension rope to the pull ring and extend the extension rope out of the pipe to pull out the support frame after welding is completed; (3) Connect the two airbag blocking components to the two support frames respectively, inflate them to achieve blocking, and then weld them; (4) After welding is completed, the annular airbag is deflated, and the first stopper is remotely controlled to shrink by pulling the extension rope. Under the rebound action of the first elastic member, the movable arm is pushed, and then the fine-tuning member is pushed to move toward the second stopper; (5) At this time, the ball supports the inner wall of the pipe. The rolling of the ball reduces the friction between the ball and the pipe wall, making it easier to pull out the support frame. During the entire pulling process, the support frame is supported on the inner wall of the pipe, and there will be no skewing or jamming problems, making it smoother to pull out.

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