Inflation device for root protection welding of stainless steel pipeline

Abstract

The utility model discloses an air inflation device for stainless steel pipeline root protection welding. The air inflation device comprises an air inflation pipe and a flow guide mechanism. Inflation holes are respectively formed in the right ends of the outer arc surfaces of the inflation tubes; the flow guide mechanism comprises a hollow disc, exhaust holes, a flow guide pipe and a sealing gasket, the hollow disc is in threaded connection with the right end of the outer arc face of the inflation pipe, the inner arc face of the hollow disc is of an opening structure, the hollow disc and the inflation hole are installed in a matched mode, the exhaust holes are formed in the outer edge of the right side face of the hollow disc, and the flow guide pipe is arranged at the right end of the hollow disc; according to the inflation device for stainless steel pipeline root protection welding, protection gas is guided to flow rightwards between the outer arc face of the flow guide pipe and the inner arc face of the stainless steel pipeline, the welding position is inflated, the interior of the pipeline does not need to be completely filled, and use of the protection gas is reduced; the time needed by stainless steel pipeline inflation is shortened, and the stainless steel pipeline root protection welding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of stainless steel pipeline root protection welding, in particular to an inflation device for stainless steel pipeline root protection welding. Background Art

[0002] Root protection welding of stainless steel pipes is a process for protecting the root of the weld during the welding process, aiming to ensure welding quality and efficiency. This welding method is particularly important because the metal at the root of the weld is easily oxidized during the welding process, resulting in a decrease in mechanical properties and corrosion resistance. Therefore, special protection measures are needed to prevent root metal oxidation and alloy element burnout. A commonly used method is to fill the back with argon gas for protection to prevent oxygen in the air from contacting the weld, thereby protecting the root of the weld from oxidation; in the existing technology, direct inflation is mostly used for the inflation of stainless steel pipes. By sealing the end of the pipe, and then inserting the inflation pipe into the interior of the stainless steel pipe, the protective gas is continuously injected into the pipe to replace the oxygen inside the pipe with protective gas. However, some pipes are larger in size, and the inflation process requires more protective gas, and the inflation process takes a long time, affecting the efficiency of stainless steel pipe root protection welding. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide an inflation device for root protection welding of stainless steel pipes, which guides the shielding gas to flow rightward between the outer arc surface of the guide tube and the inner arc surface of the stainless steel pipe. There is no need to completely fill the inside of the pipe, which reduces the use of shielding gas, speeds up the time required for inflation of the stainless steel pipe, and improves the efficiency of root protection welding of stainless steel pipes, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an inflatable device for root protection welding of stainless steel pipes, comprising an inflatable pipe and a flow guide mechanism;

[0005] Inflatable tube: The right end of its outer arc surface is provided with an inflation hole;

[0006] The guide mechanism includes a hollow disk, an exhaust hole, a guide tube and a sealing gasket. The hollow disk is threadedly connected to the right end of the outer arc surface of the inflation tube. The inner arc surface of the hollow disk is an open structure. The hollow disk is installed in conjunction with the inflation hole. Exhaust holes are respectively provided on the outer edge of the right side of the hollow disk. The right end of the hollow disk is provided with a guide tube. The left end of the hollow disk is provided with a sealing gasket. The sealing gasket is installed in conjunction with the stainless steel pipe to guide the protective gas to flow to the right between the outer arc surface of the guide tube and the inner arc surface of the stainless steel pipe to inflate the welding position. There is no need to completely fill the inside of the pipe, which reduces the use of protective gas, speeds up the time required for inflating the stainless steel pipe, and improves the efficiency of root protection welding of the stainless steel pipe.

[0007] Furthermore, the guide mechanism also includes a connecting ring, which is arranged on the inner arc surface of the guide tube. The connecting ring is threadedly connected to the right end of the hollow disk, and the guide tube is inserted into the slot on the right side of the hollow disk, which facilitates the disassembly and assembly of the guide tube.

[0008] Furthermore, the guide mechanism also includes an elastic support plate, a guide column and a top pressure ring. The elastic support plate is arranged on the outer edge of the left side of the hollow disk, the sealing gasket is arranged on the left end of the outer arc surface of the elastic support plate, and the guide columns are respectively arranged on the left side of the hollow disk. The outer arc surfaces of the four guide columns are horizontally slidably connected with a top pressure ring, and the right end of the outer arc surface of the top pressure ring is a conical arc surface to ensure the normal sealing of the sealing gasket.

[0009] Furthermore, the guide mechanism also includes a reset spring, which is respectively arranged between the top pressure ring and the hollow disk. The reset spring is movably sleeved on the outer arc surface of the guide column to facilitate the reset of the top pressure ring.

[0010] Furthermore, the outer arc surface of the inflation tube is threadedly connected with a locking rotating tube, and the right end of the locking rotating tube is installed in cooperation with the top pressure ring to push the top pressure ring to move rightward.

[0011] Furthermore, a sealing gasket 1 is provided in the mounting hole of the inner arc surface of the hollow disk to seal between the hollow disk and the inflation tube.

[0012] Furthermore, a second sealing gasket is provided in the slot on the right side of the hollow disk to seal between the guide tube and the hollow disk.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the inflatable device for root protection welding of stainless steel pipes has the following advantages:

[0014] The shielding gas is guided to flow rightward between the outer arc surface of the guide tube and the inner arc surface of the stainless steel pipe to inflate the welding position. There is no need to completely fill the inside of the pipe, which reduces the use of shielding gas, speeds up the time required to inflate the stainless steel pipe, and improves the efficiency of the root protection welding of the stainless steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the guide mechanism of the utility model in a front view section;

[0017] Figure 3 This is a schematic structural diagram of the exploded front cross-section of the flow-guiding mechanism of the present invention.

[0018] In the figure: 1 inflation tube, 2 inflation hole, 3 guide mechanism, 31 hollow disk, 32 exhaust hole, 33 guide tube, 34 sealing gasket, 35 connecting ring, 36 elastic support plate, 37 guide column, 38 top pressure ring, 39 return spring, 4 locking rotating tube, 5 sealing gasket 1, 6 sealing gasket 2. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3 , this embodiment provides a technical solution: an inflation device for root protection welding of stainless steel pipes, comprising an inflation pipe 1 and a flow guide mechanism 3;

[0021] Inflatable tube 1: The right end of its outer arc surface is provided with an inflation hole 2. The protective gas is transported through the inflation tube 1 and discharged from the inflation hole 2 to inflate the welding position of the stainless steel pipe;

[0022] The guide mechanism 3 includes a hollow disk 31, an exhaust hole 32, a guide tube 33 and a sealing gasket 34. The hollow disk 31 is threadedly connected to the right end of the outer arc surface of the inflation tube 1. The inner arc surface of the hollow disk 31 is an open structure. The hollow disk 31 is installed in conjunction with the inflation hole 2. The outer edge of the right side of the hollow disk 31 is respectively provided with an exhaust hole 32, the right end of the hollow disk 31 is provided with a guide tube 33, and the left end of the hollow disk 31 is provided with a sealing gasket 34. The sealing gasket 34 is installed in conjunction with the stainless steel pipe. The sealing gasket 34 is used to seal the hollow disk 31 and the stainless steel pipe to prevent the protective gas from flowing to the left. The protective gas enters the interior of the hollow disk 31 through the inflation hole 2 and is finally discharged from the exhaust hole 32. The protective gas is discharged from the outer arc surface of the guide tube 33 and the non- The air flows to the right between the inner arc surface of the stainless steel pipe to inflate the welding position, guide the shielding gas to concentrate on inflating the welding position, reduce the use of shielding gas, and speed up the inflation speed. The guide mechanism 3 also includes a connecting ring 35, which is arranged on the inner arc surface of the guide tube 33. The connecting ring 35 is threadedly connected to the right end of the hollow disk 31, and the guide tube 33 is inserted into the slot on the right side of the hollow disk 31, which is convenient for disassembly of the connecting ring 35. The guide mechanism 3 also includes an elastic support plate 36, a guide column 37 and a top pressure ring 38. The elastic support plate 36 is arranged on the outer edge of the left side of the hollow disk 31, and the sealing gasket 34 is arranged at the left end of the outer arc surface of the elastic support plate 36. The guide columns 37 are respectively arranged on the left side of the hollow disk 31. A top pressure ring 38 is connected to the outer arc surface of the guide column 37 for horizontal sliding. The right end of the outer arc surface of the top pressure ring 38 is a conical arc surface. The guide mechanism 3 also includes a return spring 39, which is respectively arranged between the top pressure ring 38 and the hollow disk 31. The return spring 39 is movably sleeved on the outer arc surface of the guide column 37. Under the elastic force of the return spring 39, the top pressure ring 38 is convenient to reset. The outer arc surface of the inflation tube 1 is threadedly connected with a locking rotating tube 4. The right end of the locking rotating tube 4 is installed in conjunction with the top pressure ring 38. The locking rotating tube 4 is rotated and connected to the inflation tube 1 through the threaded connection between the locking rotating tube 4 and the inflation tube 1. The locking rotating tube 4 moves rightward and applies a rightward thrust to the top pressure ring 38, overcoming the elastic force of the return spring 39, so that the top pressure ring 38 moves rightward. The conical arc surface of the top pressure ring 38 is used to apply a force to the elastic support plate 36, so that the elastic support plate 36 is deformed in the direction away from the inflation tube 1, pushing the sealing gasket 34 to fit tightly with the stainless steel pipe, and sealing between the hollow disk 31 and the stainless steel pipe. At the same time, the friction between the sealing gasket 34 and the stainless steel pipe is used to fix the position of the hollow disk 31 in the stainless steel pipe. The mounting holes on the inner arc surface of the hollow disk 31 are each provided with a sealing gasket 5. After the hollow disk 31 is connected to the inflation tube 1, the inflation hole 2 is located between the two sealing gaskets 5, which seals the hollow disk 31 and the inflation tube 1. A sealing gasket 2 6 is provided in the slot on the right side of the hollow disk 31 to seal between the hollow disk 31 and the guide tube 33.

[0023] The working principle of the inflatable device for root protection welding of stainless steel pipes provided by the present invention is as follows: when performing protective welding on the root of the stainless steel pipe, according to the size of the stainless steel pipe, a hollow disk 31 of a suitable diameter is selected to connect with the inflatable pipe 1, and then the hollow disk 31 is inserted into the interior of the stainless steel pipe so that the welding position coincides with the guide pipe 33, and then the locking rotating pipe 4 is rotated. Through the threaded connection between the locking rotating pipe 4 and the inflatable pipe 1, the locking rotating pipe 4 is moved to the right to apply a rightward thrust to the top pressure ring 38, overcoming the elastic force of the return spring 39, so that the top pressure ring 38 moves to the right, and the tapered shape of the top pressure ring 38 is utilized. The arc surface applies a force to the elastic support plate 36, causing the elastic support plate 36 to deform in the direction away from the inflation tube 1, pushing the sealing gasket 34 to fit tightly against the stainless steel pipe, thereby sealing the hollow disk 31 and the stainless steel pipe. At the same time, the friction between the sealing gasket 34 and the stainless steel pipe is used to fix the position of the hollow disk 31 in the stainless steel pipe. Then, the protective gas is introduced into the inflation tube 1, and the protective gas enters the interior of the hollow disk 31 through the inflation hole 2, and is finally discharged from the exhaust hole 32. The protective gas flows to the right between the outer arc surface of the guide tube 33 and the inner arc surface of the stainless steel pipe to inflate the welding position.

[0024] The above are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An inflator for stainless steel pipe root protection welding, characterized by: It comprises an inflation tube (1) and a flow guiding mechanism (3); Inflatable tube (1): Inflatable holes (2) are respectively provided at the right end of the outer arc surface; The flow guide mechanism (3) comprises a hollow disk (31), an exhaust hole (32), a flow guide pipe (33) and a sealing gasket (34). The hollow disk (31) is threadedly connected to the right end of the outer arc surface of the inflation tube (1). The inner arc surface of the hollow disk (31) is an open structure. The hollow disk (31) is installed in conjunction with the inflation hole (2). The outer edge of the right side of the hollow disk (31) is respectively provided with the exhaust hole (32). The right end of the hollow disk (31) is provided with a flow guide pipe (33). The left end of the hollow disk (31) is provided with a sealing gasket (34). The sealing gasket (34) is installed in conjunction with the stainless steel pipe.

2. The inflatable device for root shield welding of stainless steel pipes according to claim 1, characterized in that: The flow guide mechanism (3) further comprises a connecting ring (35), which is arranged on the inner arc surface of the flow guide tube (33), the connecting ring (35) being threadedly connected to the right end of the hollow disk (31), and the flow guide tube (33) being inserted into a slot on the right side of the hollow disk (31).

3. The inflatable device for root shield welding of stainless steel pipes according to claim 1, characterized in that: The flow guide mechanism (3) further comprises an elastic support plate (36), a guide column (37) and a top pressure ring (38), wherein the elastic support plate (36) is arranged on the outer edge of the left side of the hollow disk (31), the sealing gasket (34) is arranged on the left end of the outer arc surface of the elastic support plate (36), the guide columns (37) are respectively arranged on the left side of the hollow disk (31), and the outer arc surfaces of the four guide columns (37) are laterally slidably connected with the top pressure ring (38), and the right end of the outer arc surface of the top pressure ring (38) is a conical arc surface.

4. The inflatable device for root shield welding of stainless steel pipes according to claim 3, characterized in that: The flow guide mechanism (3) further includes a return spring (39), which is respectively arranged between the top pressure ring (38) and the hollow disk (31), and the return spring (39) is movably sleeved on the outer arc surface of the guide column (37).

5. The inflatable device for root shield welding of stainless steel pipes according to claim 3, characterized in that: The outer arc surface of the inflation tube (1) is threadedly connected to a locking rotating tube (4), and the right end of the locking rotating tube (4) is mounted in cooperation with a top pressure ring (38).

6. The inflatable device for root shield welding of stainless steel pipes according to claim 1, characterized in that: A sealing gasket (5) is provided in each mounting hole on the inner arc surface of the hollow disk (31).

7. The inflatable device for root shield welding of stainless steel pipes according to claim 1, characterized in that: A second sealing gasket (6) is provided in the slot on the right side of the hollow disk (31).

Images