Pipe welding head device

Abstract

The application provides a pipeline welding head device, which comprises an air inlet end shaft head, an air block end shaft head, a limiting mechanism one and a limiting mechanism two; the limiting mechanism one and the limiting mechanism two are both adjustable body diameter structures, the limiting mechanism one and the limiting mechanism two are respectively arranged in the inner cavities of a pipeline one and a pipeline two and respectively abut against the inner walls of the pipeline one and the pipeline two; an air chamber is formed between the limiting mechanism one and the limiting mechanism two; the air block end shaft head is arranged in the inner cavity of the pipeline one and connected with the limiting mechanism one; the air inlet end shaft head is provided with an air pipe, the air inlet end shaft head is arranged in the inner cavity of the pipeline two and connected with the limiting mechanism two, the air pipe passes through the limiting mechanism two and enters the air chamber and is detachably connected with the air block end shaft head; the air pipe is communicated with the air chamber, and the butt joint welding opening of the pipeline one and the pipeline two is located in the air chamber. The pipeline welding head device has simple structure and is convenient to use, can be applied to the welding processing of pipelines with various diameters, can greatly improve the universality and practicality, and can reduce the processing cost of the butt joint welding of the pipelines.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, and more specifically, to a pipeline welding end cap device. Background Technology

[0002] During the butt welding of large-diameter stainless steel pipes, oxygen, nitrogen, and hydrogen have adverse effects on the electric arc and molten pool. Therefore, it is necessary to internally purge the butt weld joint with argon to isolate it from air and take anti-oxidation protection measures. Currently, this is achieved by sealing both ends of the pipe with end caps, and then filling the sealed cavity with an inert gas such as argon to prevent oxidation at the weld root and the resulting defects such as porosity.

[0003] However, this sealing method has the following drawbacks: the existing sealing plate has a fixed size and can only be used for a single pipe diameter, meaning it can only be used for two pipe fittings of one diameter. For different pipe diameters, the sealing plate needs to be replaced, resulting in low versatility and practicality, and also significantly increasing the cost of pipe butt welding. In addition, the gas filling components of the existing end cap device are complex, as is the joint structure between the gas filling components and the sealing plate, further increasing the cost of pipe welding. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a pipe welding end cap device. This pipe welding end cap device has a simple structure, is easy to use, and is applicable to the welding processing of pipes of various diameters. It can not only greatly improve the versatility and practicality, but also reduce the processing cost of butt welding of pipes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pipe welding end cap device, characterized in that it is disposed within the inner cavities of pipe one and pipe two; the pipe welding end cap device includes an air inlet shaft, an air blocking shaft, a limiting mechanism one, and a limiting mechanism two; both the limiting mechanism one and the limiting mechanism two are adjustable diameter structures, and are respectively disposed within the inner cavities of pipe one and pipe two and abut against the inner walls of pipe one and pipe two; an air chamber is formed between the limiting mechanism one and the limiting mechanism two;

[0006] The gas-blocking end shaft is located in the inner cavity of pipe one and connected to the limiting mechanism one; the gas-inlet end shaft is provided with a gas pipe, which is located in the inner cavity of pipe two and connected to the limiting mechanism two. The gas pipe passes through the limiting mechanism two and enters the gas chamber, and is detachably connected to the gas-blocking end shaft; the gas pipe communicates with the gas chamber, and the butt weld joint of pipe one and pipe two is located in the gas chamber; during operation, external protective gas enters from the gas-inlet end shaft into the gas pipe, and then enters the gas chamber, so that the protective gas is filled into the inner cavity of the butt weld joint of pipe one and pipe two.

[0007] In the above-described scheme, a gas chamber can be formed between the first and second limiting mechanisms of the present invention. Furthermore, the first and second limiting mechanisms are adjustable diameter structures, making the pipe welding end cap device applicable to pipe welding of various diameters. This not only greatly improves versatility and practicality but also reduces the processing cost of butt welding of pipes. In addition, the pipe welding end cap device of the present invention has a simple structure and is easy to use. The inlet end shaft can be connected to an external air intake device. The protective gas from the air intake device can enter the air pipe from the inlet end shaft and then enter the gas chamber, thus enabling the protective gas to fill the butt weld joint of pipe one and pipe two for welding, thereby greatly improving the efficiency of the welding process.

[0008] The pipe welding end cap device also includes an air inlet buffer head, which is disposed in the inner cavity of the second pipe and detachably connected to the air pipe; the air inlet buffer head is connected to the air pipe and the air chamber respectively.

[0009] The air pipe is provided with several air outlet holes 1, which are arranged circumferentially along the outer wall of the air pipe; the air inlet buffer head is provided with a cavity and several air outlet holes 2, which are evenly arranged on the end face of the air inlet buffer head facing the air chamber, and are evenly arranged in a circle; the air pipe is connected to the cavity of the air inlet buffer head through the air outlet holes 1, and the cavity is connected to the air chamber through the air outlet holes 2; the end face of the air inlet buffer head facing the air chamber is located on the side of the butt weld joint of the first pipe and the second pipe.

[0010] The air inlet buffer head of this invention can uniformly fill the gas chamber with protective gas at the butt weld joint of pipe one and pipe two. Since several air outlet holes two are uniformly arranged in a circle, there is protective gas along the butt weld joint of pipe one and pipe two, which can improve the quality of welding.

[0011] The gas tube is detachably connected to the gas-blocking end shaft, forming a blind end. This design allows all the incoming protective gas to flow out through the gas outlet.

[0012] The limiting mechanism one and limiting mechanism two have the same structure, both including a fixed disk, a turntable, several push rods, and several fins; the number of push rods is equal to the number of fins, one end of each push rod is connected to the turntable, and the other end is connected to each of the fins; the fins are located inside the fixed disk, and the fins surround each other to form a circular shape, serving as a limiting disk that abuts against the inner wall of pipe one or pipe two; during operation, the turntable rotates and pushes each fin to move simultaneously through the push rods, so that the radius of the limiting disk formed by the fins is adjustable.

[0013] The limiting mechanism one and limiting mechanism two of this invention do not need to be replaced according to the pipe diameters of pipe one and pipe two. The radius of the limiting plate can be adjusted directly by rotating the turntable of limiting mechanism one and limiting mechanism two, so that the limiting plate abuts against the inner wall of pipe one or pipe two of different diameters, achieving the sealing effect. This method is simple to operate, which not only greatly improves versatility and practicality, but also reduces the processing cost of butt welding pipe one and pipe two.

[0014] The fixed plate is provided with a support hole one, and the turntable is provided with a support hole two; the pipe welding end cap device is also provided with a flat key; the support hole one is provided with a flat keyway, and the flat key is provided in the flat keyway.

[0015] The air-blocking end shaft passes through the support hole one and support hole two of the limiting mechanism to connect with the limiting mechanism; the pipe welding end cap device also includes a locking nut, which is detachably connected to the air-blocking end shaft and located outside the turntable of the limiting mechanism to lock the turntable of the limiting mechanism.

[0016] This invention uses a flat key to tightly connect the fixed disc of the limiting mechanism one to the air-blocking end shaft. The locking nut locks the turntable, preventing the turntable of the limiting mechanism one from rotating during operation and causing a change in the radius of the limiting disc formed by the fins.

[0017] The air pipe of the air inlet shaft passes through the support hole one and support hole two of the limiting mechanism two, and the air inlet shaft abuts against the turntable of the limiting mechanism two to lock the turntable of the limiting mechanism two.

[0018] This invention uses a flat key to tightly connect the fixed disc of the limiting mechanism two to the air pipe of the air inlet shaft. The air inlet shaft has a locking effect on the turntable, preventing the turntable of the limiting mechanism two from rotating during operation and causing a change in the radius of the limiting disc formed by the fins.

[0019] The inner side of the fixed disk is provided with a guide to facilitate the movement of each fin; the guide has a number of guide grooves, the number of which is equal to the number of fins, and each fin is located in a corresponding guide groove; during operation, the fins move along the edge of the guide groove. The guide grooves ensure the stability of the fin's movement trajectory.

[0020] Each fin includes a body and a docking part; the docking part is connected to the body; the formation of a circular shape by several fins means that the docking parts of adjacent fins are docked, and the several fins form a circular shape.

[0021] Each fin has a notch at one end and a protrusion at the other end of its mating portion. The protrusion matches and mates with the notch. The mating of adjacent fins means that each fin mates with the notch of an adjacent fin on one side through the protrusion and with the protrusion of an adjacent fin on the other side through the notch, thus achieving mating of adjacent fins.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects: the pipe welding end cap device of the present invention has a simple structure, is easy to use, and can be applied to the welding processing of pipes of various diameters. It can not only greatly improve the versatility and practicality, but also reduce the processing cost of butt welding of pipes. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pipe welding end cap device of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the pipe welding end cap device of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the pipe welding end cap device of the present invention in the inner cavity of pipe one and pipe two;

[0026] Figure 4 This is a schematic diagram of either the limiting mechanism one or the limiting mechanism two in the pipe welding end cap device of the present invention. Figure 1 ;

[0027] Figure 5 This is a schematic diagram of either the limiting mechanism one or the limiting mechanism two in the pipe welding end cap device of the present invention. Figure 2 ;

[0028] Figure 6 This is a schematic diagram of the fixed plate in the limiting mechanism one or the limiting mechanism two of the present invention;

[0029] Figure 7 This is an internal schematic diagram of either the limiting mechanism one or the limiting mechanism two of the present invention. Figure 1 ;

[0030] Figure 8 This is an internal schematic diagram of either the limiting mechanism one or the limiting mechanism two of the present invention. Figure 2 ;

[0031] Among them, 1 is pipe one, 2 is pipe two, 3 is air inlet end shaft, 4 is air blockage end shaft, 5 is limit mechanism one, 6 is limit mechanism two, 7 is air pipe, 7.1 is air outlet one, 8 is butt weld joint, 9 is air inlet buffer head, 9.1 is cavity, 9.2 is air outlet two, 11 is fixed plate, 11.1 is support hole one, 11.2 is flat keyway, 12 is turntable, 12.1 is support hole two, 13 is fin, 13.1 is body, 13.2 is notch position, 13.3 is protrusion position, 14 is push rod, 15 is locking nut, 16 is flat key, 17 is guide component, and 17.1 is guide groove. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Example

[0033] like Figures 1 to 8 As shown, the pipe welding end cap device of the present invention is installed in the inner cavity of pipe 1 and pipe 2. The pipe welding end cap device includes an air inlet shaft 3, an air blocking shaft 4, a limiting mechanism 1 5 and a limiting mechanism 2 6. The limiting mechanism 1 5 and the limiting mechanism 2 6 are both adjustable diameter structures. The limiting mechanism 1 5 and the limiting mechanism 2 6 are respectively installed in the inner cavity of pipe 1 and pipe 2 and abut against the inner wall of pipe 1 and pipe 2 respectively. An air chamber is formed between the limiting mechanism 1 5 and the limiting mechanism 2 6.

[0034] The air-blocking end shaft 4 is located inside the cavity of pipe 1 and connected to the limiting mechanism 5. The air-inlet end shaft 3 is equipped with an air pipe 7. The air-inlet end shaft 3 is located inside the cavity of pipe 2 and connected to the limiting mechanism 6. The air pipe 7 passes through the limiting mechanism 6 and enters the air chamber, and is detachably connected to the air-blocking end shaft 4 to form a blind end. The air pipe 7 communicates with the air chamber. The butt weld joint 8 of pipe 1 and pipe 2 is located in the air chamber. During operation, external protective gas enters from the air-inlet end shaft 3 into the air pipe 7, and then enters the air chamber, so that the protective gas is filled into the cavity of the butt weld joint 8 of pipe 1 and pipe 2.

[0035] The pipe welding end cap device of the present invention further includes an air inlet buffer head 9, which is disposed in the inner cavity of pipe 2 and detachably connected to the air pipe 7. The air inlet buffer head 9 is connected to the air pipe 7 and the air chamber. Specifically, the air pipe 7 is provided with a plurality of air outlet holes 7.1, which are arranged circumferentially along the outer wall of the air pipe 7. The air inlet buffer head 9 is provided with a cavity 9.1 and a plurality of air outlet holes 9.2, which are evenly arranged on the end face of the air inlet buffer head 9 facing the air chamber and are evenly arranged in a circle. The air pipe 7 is connected to the cavity 9.1 of the air inlet buffer head 9 through the air outlet holes 7.1, and the cavity 9.1 is connected to the air chamber through the air outlet holes 9.2. The end face of the air inlet buffer head 9 facing the air chamber is located on the side of the butt weld joint 8 of pipe 1 and pipe 2. The air intake buffer head 9 of this invention can uniformly fill the gas chamber with protective gas at the butt weld joint 8 of pipe 1 and pipe 2. Since several air outlet holes 9.2 are uniformly arranged in a circle, there is protective gas along the butt weld joint 8 of pipe 1 and pipe 2, which can improve the quality of welding.

[0036] The limiting mechanism 5 and limiting mechanism 6 of the present invention have the same structure, both including a fixed disk 11, a turntable 12, several push rods 14 and several fins 13. The number of push rods 14 is equal to the number of fins 13. One end of each push rod 14 is connected to the turntable 12 and the other end is connected to the several fins 13. The several fins 13 are located inside the fixed disk 11 and are arranged in a circular shape to serve as a limiting disk that abuts against the inner wall of pipe 1 or pipe 2. During operation, the turntable 12 rotates and pushes each fin 13 to move simultaneously through the push rods 14, so that the radius of the limiting disk formed by the arrangement of the fins 13 is adjustable.

[0037] The fixed disk 11 of this invention is provided with a support hole 11.1, and the turntable 12 is provided with a support hole 12.1. The pipe welding end cap device is also provided with a flat key 16 and a locking nut 15. The support hole 11.1 is provided with a flat keyway 11.2, and the flat key 16 is disposed in the flat keyway 11.2. The air-blocking end shaft 4 passes through the support hole 11.1 and the support hole 12.1 of the limiting mechanism 5 to connect with the limiting mechanism 5. The locking nut 15 is detachably connected to the air-blocking end shaft 4 and is located outside the turntable 12 of the limiting mechanism 5 to lock the turntable 12 of the limiting mechanism 5. The air pipe 7 of the air inlet end shaft 3 passes through the support hole 11.1 and the support hole 12.1 of the limiting mechanism 6. The air inlet end shaft 3 abuts against the turntable 12 of the limiting mechanism 6 to lock the turntable 12 of the limiting mechanism 6.

[0038] In this invention, a flat key 16 is used to tightly connect the fixed plate 11 of the limiting mechanism 5 to the air-blocking end shaft head 4. A locking nut 15 locks the turntable 12, preventing rotation of the turntable 12 of the limiting mechanism 5 during operation and thus avoiding changes in the radius of the limiting plate formed by the fins 13. Similarly, the flat key 16 is used to tightly connect the fixed plate 11 of the limiting mechanism 6 to the air pipe 7 of the air inlet end shaft head 3. Simultaneously, the air inlet end shaft head 3 locks the turntable 12, preventing rotation of the turntable 12 of the limiting mechanism 6 during operation and thus avoiding changes in the radius of the limiting plate formed by the fins 13.

[0039] The inner side of the fixed disk 11 of the present invention is provided with a guide member 17 to facilitate the movement of each fin 13. The guide member 17 is provided with a plurality of guide grooves 17.1, the number of guide grooves 17.1 being equal to the number of fins 13, with each fin 13 located in a corresponding guide groove 17.1. During operation, the fins 13 move along the edge of the guide grooves 17.1. The guide grooves 17.1 can ensure the stability of the movement trajectory of the fins 13.

[0040] In addition, each fin 13 includes a body 13.1 and a docking portion, which is connected to the body 13.1. The formation of a circular shape by several fins 13 means that one end of the docking portion of each fin 13 is provided with a notch 13.2 and the other end is provided with a protrusion 13.3, which matches and docks with the notch 13.2. Among the several fins 13, each fin 13 docks with the notch 13.2 of the adjacent fin 13 on one side through the protrusion 13.3, and docks with the protrusion 13.3 of the adjacent fin 13 on the other side through the notch 13.2, thereby realizing the docking of the docking portions of the adjacent fins 13, and the several fins 13 form a circular shape.

[0041] A gas chamber can be formed between the limiting mechanism 5 and the limiting mechanism 6 of the present invention. Furthermore, the limiting mechanisms 5 and 6 are adjustable in diameter, making the pipe welding end cap device applicable to pipe welding of various diameters. This significantly improves versatility and practicality, and reduces the processing cost of butt welding of pipes. In addition, the pipe welding end cap device of the present invention has a simple structure and is easy to use. The air inlet shaft 3 can be connected to an external air inlet device. The protective gas from the air inlet device can enter the air pipe 7 from the air inlet shaft 3, and then enter the gas chamber. This allows the protective gas to be filled into the butt weld joint 8 of pipe 1 and pipe 2 for welding, thereby greatly improving the efficiency of the welding process.

[0042] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A pipe welding closure device, characterized by: The pipeline welding head device is characterized in that: a cavity is arranged in the pipeline one and the pipeline two; the pipeline welding head device comprises a gas inlet end shaft head, a gas blocking end shaft head, a limiting mechanism one and a limiting mechanism two; the limiting mechanism one and the limiting mechanism two are both adjustable body diameter structures, and the limiting mechanism one and the limiting mechanism two are arranged in the cavities of the pipeline one and the pipeline two respectively and abut against the inner walls of the pipeline one and the pipeline two respectively; a gas chamber is formed between the limiting mechanism one and the limiting mechanism two. The gas blocking end shaft head is arranged in the cavity of the pipeline one and connected with the limiting mechanism one; the gas inlet end shaft head is provided with a gas pipe, the gas inlet end shaft head is arranged in the cavity of the pipeline two and connected with the limiting mechanism two, the gas pipe passes through the limiting mechanism two and enters the gas chamber and is detachably connected with the gas blocking end shaft head; the gas pipe is in communication with the gas chamber, and the butt joint welding opening of the pipeline one and the pipeline two is located at the gas chamber; during operation, the external protective gas enters the gas pipe from the gas inlet end shaft head, and then enters the gas chamber, so that the protective gas is filled into the cavities of the butt joint welding openings of the pipeline one and the pipeline two. The limiting mechanism one and the limiting mechanism two are the same in structure and both comprise a fixed disc, a rotating disc, a plurality of push rods and a plurality of fins; the number of the push rods is equal to the number of the fins, one end of each of the plurality of push rods is connected with the rotating disc, and the other end of each of the plurality of push rods is connected with each of the plurality of fins; the plurality of fins are located on the inner side of the fixed disc, the plurality of fins are arranged in a circular shape and serve as a limiting disc abutting against the inner wall of the pipeline one or the pipeline two; during operation, the rotating disc rotates and drives each of the fins to move simultaneously through the push rods, so that the radius of the limiting disc formed by the fins is adjustable. The fixed disc is provided with a support hole one, and the rotating disc is provided with a support hole two; the pipeline welding head device is further provided with a flat key; the support hole one is provided with a flat key groove, and the flat key is arranged in the flat key groove. The gas blocking end shaft head passes through the support hole one and the support hole two of the limiting mechanism one to be connected with the limiting mechanism one; the pipeline welding head device further comprises a locking nut, the locking nut is detachably connected with the gas blocking end shaft head and located on the outer side of the rotating disc of the limiting mechanism one, and the rotating disc of the limiting mechanism one is locked.

2. The pipe welding closure device of claim 1, wherein: The pipeline welding head device further comprises a gas inlet buffer head, the gas inlet buffer head is arranged in the cavity of the pipeline two and detachably connected with the gas pipe; the gas inlet buffer head is in communication with the gas pipe and the gas chamber respectively.

3. The pipe welding closure device of claim 2, wherein: The gas pipe is provided with a plurality of gas outlet holes one, and the plurality of gas outlet holes one are arranged in a circumferential direction along the outer wall of the gas pipe; the gas inlet buffer head is provided with a cavity and a plurality of gas outlet holes two, the plurality of gas outlet holes two are uniformly arranged on the end face of the gas inlet buffer head facing the gas chamber, and the plurality of gas outlet holes two are uniformly arranged in a circular shape; the gas pipe is in communication with the cavity of the gas inlet buffer head through the gas outlet holes one, and the cavity is in communication with the gas chamber through the gas outlet holes two; the end face of the gas inlet buffer head facing the gas chamber is located on the side of the butt joint welding opening of the pipeline one and the pipeline two.

4. The pipe welding closure device of claim 1, wherein: The gas pipe is detachably connected with the gas blocking end shaft head and forms a blind end.

5. The pipe welding closure device of claim 1, wherein: The gas pipe of the gas inlet end shaft head passes through the support hole one and the support hole two of the limiting mechanism two, the gas inlet end shaft head abuts against the rotating disc of the limiting mechanism two, and the rotating disc of the limiting mechanism two is locked.

6. The pipe welding closure device of claim 1, wherein: The inner side of the fixed disc is provided with a guide facilitating movement of each fin; the guide is provided with a plurality of guide grooves, the number of the guide grooves being equal to the number of the fins, and each fin is located in a corresponding guide groove; in operation, the fins move along the edges of the guide grooves.

7. The pipe welding closure device of claim 1, wherein: Each fin comprises a body and a butt joint part; the butt joint part is connected with the body; the plurality of fins surround to form a circular shape, which means that the butt joint parts of adjacent fins butt joint, and the plurality of fins surround to form a circular shape.

8. The pipe welding closure device of claim 7, wherein: One end of the butt joint part of each fin is provided with a notch position, and the other end is provided with a protruding position, and the protruding position matches and butt joints with the notch position; the butt joint parts of the adjacent fins butt joint, which means that each fin butt joints with the notch position of one side adjacent fin through the protruding position, and butt joints with the protruding position of the other side adjacent fin through the notch position, so as to realize butt joint of the butt joint parts of the adjacent fins.

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