Inflation protection device for welding

Abstract

The invention provides an inflation protection device for welding, and relates to the technical field of pipeline welding. The inflation protection device for welding comprises an inflation cover assembly and a support assembly. The inflation cover assembly comprises an inflation cover and a telescopic structure. The support assembly comprises a rotating shaft and a supporting frame structure. The telescopic structure and the supporting frame structure are arranged on the rotating shaft at intervals, and the inflation cover is installed on the telescopic structure. The telescopic structure is used for stretching out and drawing back in the radial direction of the rotating shaft. The inflation cover is used for covering the inner side of a local butt joint opening between every two adjacent pipelines. The rotating shaft is rotationally connected with the supporting frame structure, the supporting frame structure is used for being fixed to the end of a to-be-welded pipeline, and the rotating shaft is used for rotating. According to the device, a local inflation chamber is formed on the inner side of a pipeline butt-joint opening through the inflation cover, then the support assembly is used for driving the inflation cover to rotate, welding operation of the whole butt-joint opening can be completed, the use amount of protective gas is effectively reduced, meanwhile, the position of the inflation cover can be adjusted through the telescopic structure, and the inflation cover is made to be matched with pipelines with different pipe diameters.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline welding, in particular to a gas-filled protective device for welding. Background Art

[0002] When welding pipelines such as container cylinders and coiled welded pipes for nuclear power plants, the welding process at the interface between the two pipelines is usually carried out using argon arc welding. Argon arc welding requires argon filling protection on the back of the welded part (that is, the inside of the pipeline) to prevent oxidation at the root of the weld and ultimately ensure the quality of the weld.

[0003] At present, the argon filling protection method is usually to place a gas blocking device (such as a partition) inside the pipes on both sides of the butt weld (i.e., the weld) to be welded, and set an argon gas inlet and outlet in the gas blocking device, so that the butt weld and the gas blocking device form an argon chamber, ensuring that the entire butt weld is in an argon protective atmosphere.

[0004] This method can better keep the root of the weld in an argon protective atmosphere, but the size of the gas barrier device is limited by the inner diameter of the pipeline. Different gas barrier devices need to be made for different pipe diameters, and the scope of application is small. In addition, the filling area of ​​argon gas is the entire annular weld. If the welder cannot continuously complete the weld or needs to suspend welding due to an emergency, the entire argon chamber needs to be continuously inflated, or the argon gas must be emptied first and then inflated again when the welder welds next time, resulting in large argon usage and high costs. Summary of the invention

[0005] The purpose of the present invention is to provide a gas-filled protective device for welding, so as to alleviate the problem in the prior art that when welding pipelines using an argon arc welding process, a gas blocking device needs to be placed inside the pipelines on both sides of the joint to be welded to form an argon chamber. However, the size of the gas blocking device is limited by the inner diameter of the pipeline, and its application range is small. In addition, the filling area of ​​argon gas is the entire annular weld, which leads to technical problems such as large argon gas usage and high cost.

[0006] In a first aspect, the present invention provides a welding gas protection device, comprising a gas hood assembly and a bracket assembly;

[0007] The inflatable hood assembly includes an inflatable hood and a telescopic structure, and the support assembly includes a rotating shaft and a support frame structure;

[0008] The telescopic structure and the support frame structure are arranged on the rotating shaft at intervals, and the inflatable cover is installed on the telescopic structure; the telescopic structure is used to be telescopic along the radial direction of the rotating shaft, and the inflatable cover is used to be arranged on the inner side of the local docking interface between the two adjacent pipes when the rotating shaft extends into the interior of the two adjacent pipes to be welded;

[0009] The rotating shaft is rotatably connected to the support frame structure, the support frame structure is used to be fixed at the end of the pipe to be welded, and the rotating shaft is used to rotate to drive the telescopic structure and the inflatable hood to rotate along the circumferential direction of the rotating shaft.

[0010] In an optional embodiment, the telescopic structure includes a support plate and an elastic member, the support plate is fixed on the rotating shaft, and the elastic member is connected between the support plate and the inflatable hood.

[0011] In an optional embodiment, a side of the inflation hood facing away from its opening is connected to a first air nozzle, and the elastic member is a hollow structure and the elastic member is sleeved outside the first air nozzle.

[0012] In an optional embodiment, the telescopic structure further includes a limiter;

[0013] The limiting member is fixed on the support plate and is provided with a through hole, and one end of the first gas nozzle away from the inflation cover passes through the through hole on the limiting member and then extends to a side of the limiting member close to the rotating shaft;

[0014] The elastic member is in contact with between the limiting member and the inflation cover.

[0015] In an optional embodiment, the inflatable hood assembly further includes a guide structure, wherein the guide structure is installed between the support plate and the inflatable hood and is used to limit the movement of the inflatable hood along the extension and contraction direction of the elastic member.

[0016] In an optional embodiment, the support frame structure includes a bearing seat and a plurality of telescopic arms;

[0017] The rotating shaft is rotatably connected to the bearing seat, one end of the multiple telescopic arms is fixed on the outer peripheral wall of the bearing seat at intervals along the circumference of the bearing seat, and the other ends of the multiple telescopic arms are detachably connected to the ends of the pipes to be welded.

[0018] In an optional embodiment, a clamping piece is provided at the end of each telescopic arm away from the bearing seat, and the telescopic arm is detachably connected to the end of the pipe to be welded via the clamping piece.

[0019] In an optional embodiment, the support assembly further comprises an auxiliary support structure capable of being folded or unfolded;

[0020] The auxiliary support structure is installed at a position of the rotating shaft close to the inflatable hood assembly, and the auxiliary support structure is used to abut against the inner wall of the pipe to be welded when unfolded.

[0021] In an optional embodiment, the auxiliary support structure includes a main cylinder, a driving member and a plurality of hinged rods;

[0022] The main cylinder is sleeved and fixed outside the rotating shaft, the two ends of the hinge rod are respectively a hinge end and a free end, and the hinge ends of the plurality of hinge rods are distributed at intervals along the circumference of the main cylinder and are all hinged to the outer wall of the main cylinder;

[0023] Each of the hinged rods is connected to the driving member, and the driving member is used to drive the hinged rod to rotate with its hinged end as the rotation center, so that the free end of the hinged rod is away from the rotation axis.

[0024] In an optional embodiment, the auxiliary support structure further includes a reset member, and the reset member is connected between each of the hinged rods and the main cylinder, and the reset member is used to store energy when the free end of the hinged rod is away from the rotation axis.

[0025] The inflatable protection device for welding provided by the present invention comprises an inflatable hood assembly and a bracket assembly; the inflatable hood assembly comprises an inflatable hood and a telescopic structure, and the bracket assembly comprises a rotating shaft and a support frame structure; the telescopic structure and the support frame structure are arranged on the rotating shaft at intervals, and the inflatable hood is installed on the telescopic structure; the telescopic structure is used to telescope along the radial direction of the rotating shaft, and the inflatable hood is used to be arranged on the inner side of the local docking interface between the two adjacent pipes when the rotating shaft extends into the interior of the two adjacent pipes to be welded; the rotating shaft is rotatably connected to the support frame structure, the support frame structure is used to be fixed at the end of the pipe to be welded, and the rotating shaft is used to rotate to drive the telescopic structure and the inflatable hood to rotate along the circumferential direction of the rotating shaft. The inflatable protection device for welding provided by the present invention can be used for welding operations between pipelines such as container cylinders and coiled welded pipes for nuclear power plants. Before welding, the radial spacing of the inflatable hood relative to the rotating shaft is adjusted using the telescopic structure in the inflatable hood assembly, so that the radial spacing between the inflatable hood and the rotating shaft is adapted to the radius of the pipeline to be welded, and then the pipe openings of the two pipelines to be welded are butted, and the rotating shaft is extended into one of the pipelines to be welded, and the rotating shaft is located at the central axis of the pipeline. At the same time, the opening side of the inflatable hood in the inflatable hood assembly on the rotating shaft is abutted against the local position of the docking interface between the two pipelines, so that the inflatable hood is used to form a local inflation chamber on the inner side of the docking interface. Then fix the support frame structure at the end of the pipe to be welded away from the docking interface. At this time, the position of the rotating shaft in the pipe is fixed but can rotate on the support frame structure. Then, protective gas such as argon can be supplied into the inflatable hood, and welding operations can be performed at the position corresponding to the inflatable hood on the outside of the pipe docking interface. At this time, the back side (i.e., the inside) of the docking interface within the coverage of the inflatable hood can be protected by argon filling, which can ensure that the local welding operation of the docking interface can proceed smoothly. After the docking interface within the coverage of the inflatable hood is welded, the rotating shaft is rotated at the support frame structure, so that the rotating shaft drives the inflatable hood to rotate along the circumference of the pipe at the docking interface, so that the inflatable hood protects the next local docking interface position, and then repeats the inflation and welding process to complete the welding operation of the next local docking interface. Repeat the above-mentioned rotation of the rotating shaft to adjust the position of the inflatable hood, inflation and local welding process to complete the welding operation at the entire docking interface. Since each inflation process only inflates the local interface covered by the inflation hood, even if the welder cannot continuously complete the welding of the weld or needs to suspend welding in case of an emergency, there is no need to continuously inflate the inner side of the entire annular interface, which can effectively save the amount of protective gas used and reduce the cost of using protective gas. In addition, when it is necessary to weld pipes of different diameters, the inflatable protective device for welding can adjust the radial spacing of the inflatable hood relative to the rotating axis through the telescopic structure, so that the inflatable hood is adapted to pipes of different diameters, and there is no need to make inflatable protective devices of different sizes for pipes of different sizes. Therefore, the inflatable protective device for welding provided by the present invention has a wider range of applications.

[0026] Compared with the prior art, the welding gas protection device provided by the present invention can form a local gas-filled chamber at the interface between two pipes to be welded by using the gas-filled hood, and then the position of the gas-filled hood can be adjusted along the circumference of the pipe by using the bracket assembly, so that the welding operation at the entire pipe interface can be completed, without the need to continuously inflate the inner side of the entire circumferential interface, thereby effectively reducing the amount of protective gas used and reducing the cost of using the protective gas. At the same time, the device can also use a telescopic structure to adjust the radial spacing of the gas-filled hood relative to the rotating shaft, so that the gas-filled hood can adapt to pipes of different diameters and improve the use range of the gas-filled hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a welding gas protection device and a pipeline provided in an embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of an inflatable hood assembly provided in an embodiment of the present invention;

[0030] Figure 3 A top view of an inflatable hood assembly provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the structure of the support frame, the rotating shaft and the pipeline provided in an embodiment of the present invention;

[0032] Figure 5 A schematic structural diagram of an auxiliary support structure provided in an embodiment of the present invention.

[0033] Icons: 1-inflatable hood assembly; 10-inflatable hood; 100-first air nozzle; 101-second air nozzle; 11-telescopic structure; 110-support plate; 1100-clamp; 111-elastic member; 112-limiting member; 12-sliding fixing sleeve; 13-guide structure; 130-guide frame; 131-limiting ring; 2-bracket assembly; 20-rotating shaft; 200-handwheel; 21-support frame structure; 210-bearing seat; 2100-bearing; 211-telescopic arm; 2110-bolt and nut assembly; 212-clamping member; 22-auxiliary support structure; 220-main cylinder; 221-driving member; 2210-abutting sleeve; 2211-threaded sleeve; 2212-connecting rod; 222-hinged rod; 223-resetting member; 224-roller; 3-pipeline; 30-docking port; 4-screen. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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 part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0037] Example:

[0038] like Figure 1 and Figure 2 As shown, the inflatable protection device for welding provided in this embodiment includes an inflatable hood assembly 1 and a bracket assembly 2; the inflatable hood assembly 1 includes an inflatable hood 10 and a telescopic structure 11, and the bracket assembly 2 includes a rotating shaft 20 and a support frame structure 21; the telescopic structure 11 and the support frame structure 21 are arranged on the rotating shaft 20 at intervals, and the inflatable hood 10 is installed on the telescopic structure 11; the telescopic structure 11 is used to telescope along the radial direction of the rotating shaft 20, and the inflatable hood 10 is used to be arranged on the inner side of the local docking interface 30 between the two adjacent pipes 3 when the rotating shaft 20 extends into the interior of the two adjacent pipes 3 to be welded; the rotating shaft 20 is rotatably connected to the support frame structure 21, the support frame structure 21 is used to be fixed at the end of the pipe 3 to be welded, and the rotating shaft 20 is used to rotate to drive the telescopic structure 11 and the inflatable hood 10 to rotate along the circumferential direction of the rotating shaft 20.

[0039] The welding inflatable protection device provided in this embodiment can be used for welding operations between pipelines 3 such as container cylinders and coiled welded pipes for nuclear power plants. Before welding, the radial spacing of the inflatable hood 10 relative to the rotating shaft 20 is adjusted by using the telescopic structure 11 in the inflatable hood assembly 1, so that the radial spacing between the inflatable hood 10 and the rotating shaft 20 is adapted to the radius of the pipeline 3 to be welded, and then the pipe mouths of the two pipelines 3 to be welded are connected, and then the rotating shaft 20 is extended into one of the pipelines 3 to be welded, and the rotating shaft 20 is located at the central axis of the pipeline 3. At the same time, the open side of the inflatable hood 10 in the inflatable hood assembly 1 on the rotating shaft 20 is abutted against the local position of the docking interface 30 between the two pipelines 3, so that the inflatable hood 10 is used to form a local inflation chamber on the inner side of the docking interface 30. Then, the support frame structure 21 is fixed to the end of the pipe 3 to be welded away from the docking port 30. At this time, the position of the rotating shaft 20 in the pipe 3 is fixed but can rotate on the support frame structure 21. Then, argon or other protective gas can be supplied to the inflatable hood 10, and welding operations are performed at a position corresponding to the inflatable hood 10 on the outside of the docking port 30 of the pipe 3. At this time, the back side (i.e., the inner side) of the docking port 30 within the coverage of the inflatable hood 10 can be protected by argon filling, which can ensure that the local welding operation of the docking port 30 can be carried out smoothly.

[0040] After the welding of the docking interface 30 within the coverage of the inflatable hood 10 is completed, the rotating shaft 20 is rotated at the support frame structure 21, so that the rotating shaft 20 drives the inflatable hood 10 to rotate along the circumference of the pipeline 3 at the docking interface 30, so that the inflatable hood 10 protects the position of the next local docking interface 30, and then repeats the inflation and welding process to complete the welding operation of the next local docking interface 30.

[0041] The welding operation at the entire docking port 30 can be completed by repeating the above-mentioned rotating shaft 20 to adjust the position of the inflatable hood 10, inflation and partial welding process.

[0042] Since each inflation process only inflates the local docking interface 30 covered by the inflation hood 10, even if the welder cannot continuously complete the welding of the weld or needs to suspend welding due to an emergency, there is no need to continuously inflate the inner side of the entire annular docking interface 30, which can effectively save the use of protective gas and reduce the cost of using protective gas.

[0043] In addition, when it is necessary to weld pipes 3 of different diameters, the welding inflatable protective device can adjust the radial spacing of the inflatable hood 10 relative to the rotating shaft 20 through the telescopic structure 11, so that the inflatable hood 10 is adapted to pipes 3 of different diameters. There is no need to manufacture inflatable protective devices of different sizes for pipes 3 of different sizes. Therefore, the welding inflatable protective device provided in this embodiment has a wider range of applications.

[0044] Compared with the prior art, the welding gas protection device provided in this embodiment can use the gas hood 10 to form a local gas chamber at the interface 30 between the two pipes 3 to be welded, and then the position of the gas hood 10 can be adjusted along the circumference of the pipe 3 by using the bracket assembly 2, so that the welding operation at the interface 30 of the entire pipe 3 can be completed, without the need to continuously inflate the inner side of the entire annular interface 30, thereby effectively reducing the amount of protective gas used and reducing the cost of using the protective gas. At the same time, the device can also use the telescopic structure 11 to adjust the radial spacing of the gas hood 10 relative to the rotating shaft 20, so that the gas hood 10 can adapt to pipes 3 of different diameters, thereby improving the use range of the gas hood 10.

[0045] It should be noted that, in order to prevent the opening side of the inflatable hood 10 from scratching the inner wall of the pipe 3, in this embodiment, the opening side of the inflatable hood 10 is preferably covered with a protective layer made of a flexible material such as nylon.

[0046] In addition, in order to improve the uniformity of the distribution of the protective gas in the inflatable cover 10, as Figure 3 As shown, a screen 4 may be installed in the inflatable hood 10 .

[0047] Furthermore, the screen 4 may be multi-layered, and the multi-layered screen 4 is distributed in sequence along the axial direction of the inflation hood 10 .

[0048] The multi-layer screen 4 can further improve the uniformity of shielding gas distribution, thereby improving welding quality.

[0049] The mesh surface of each layer of the screen 4 may be wavy. Compared with the flat screen 4, the wavy screen 4 has a better effect on the uniform distribution of gas.

[0050] In order to further improve the uniformity of gas distribution, the meshes between two adjacent layers of screens 4 can also be staggered.

[0051] The telescopic structure 11 in the inflatable hood assembly 1 may be a telescopic tube formed by sequentially sleeved multiple tubes, a screw structure with a nut, or an electric push rod.

[0052] In order to improve the convenience of using the telescopic structure 11, Figure 2 As shown, the telescopic structure 11 of this embodiment preferably includes a support plate 110 and an elastic member 111 . The support plate 110 is fixed on the rotating shaft 20 , and the elastic member 111 is connected between the support plate 110 and the inflatable cover 10 .

[0053] The support plate 110 is used to support the elastic member 111 to improve the stability of the elastic member 111 during use.

[0054] It should be noted that the support plate 110 can be fixed on the rotating shaft 20 by welding, integral molding, etc. In order to improve the convenience of installation and removal of the inflatable cover assembly 1, as Figure 2As shown, in this embodiment, a clamp 1100 is preferably provided on the side of the support plate 110 away from the inflatable cover 10 , and the support plate 110 is detachably connected to the rotating shaft 20 via the clamp 1100 .

[0055] When it is necessary to adjust the radial spacing of the inflatable hood 10 relative to the rotating shaft 20, the rotating shaft 20 can be directly inserted into the pipe 3 to be welded. At this time, the elastic member 111 can automatically expand and contract based on the radius of the pipe 3, so that the opening side of the inflatable hood 10 abuts against the inner side of the docking port 30 of the pipe 3.

[0056] It can be seen that the elastic member 111 is used to automatically retract and expand to drive the inflatable hood 10 to automatically move closer to or away from the rotating axis 20 along the radial direction of the rotating axis 20, so that the inflatable hood 10 can adapt to the change of the inner diameter of the pipe 3 by itself, and there is no need to manually adjust the expansion and contraction amount of the telescopic structure 11. This can not only improve the radial position accuracy of the inflatable hood 10 relative to the rotating axis 20 and the ease of use of the telescopic structure 11, but also effectively improve the fitting stability between the inflatable hood 10 and the inner wall of the pipe 3, and prevent the inflatable hood 10 from being unable to fit with the inner wall of the pipe 3 due to the roundness deviation of the inner wall of the pipe 3, thereby causing the protective gas to leak and the increased usage of the protective gas.

[0057] Further, such as Figure 2 As shown, the side of the inflator 10 facing away from the opening is connected to the first gas nozzle 100 , and the elastic member 111 is a hollow structure and is sleeved outside the first gas nozzle 100 .

[0058] The first gas nozzle 100 is used to communicate with an external gas supply device so that the external gas supply device can supply protective gas into the inflation hood 10 .

[0059] By sleeve-arranging the elastic member 111 outside the first gas nozzle 100 , the first gas nozzle 100 can be used to support the elastic member 111 , thereby effectively improving the telescopic accuracy and the use stability of the elastic member 111 .

[0060] The hollow elastic member 111 may be a coil spring.

[0061] like Figure 2 As shown, in order to improve the use range of the inflation hood assembly 1, the circumferential side wall of the inflation hood 10 can also be connected to a second air nozzle 101, and either the second air nozzle 101 or the first air nozzle 100 is connected to an external air supply device.

[0062] During use, the first air nozzle 100 or the second air nozzle 101 can be connected to an external air supply device according to actual working conditions. At this time, to prevent air leakage, the air nozzle of the first air nozzle 100 and the second air nozzle 101 that is not connected to the external air supply device is sealed with a nut.

[0063] It can be seen that the second air nozzle 101 and the first air nozzle 100 can make the inflation hood assembly 1 applicable to more working conditions, and effectively improve the use scope of the inflation hood assembly 1.

[0064] like Figure 2 As shown, the telescopic structure 11 may also include a limit member 112; the limit member 112 is fixed on the support plate 110 and is provided with a through hole, and the end of the first air nozzle 100 away from the inflation hood 10 passes through the through hole on the limit member 112 and then extends to the side of the limit member 112 close to the rotating shaft 20; the elastic member 111 abuts between the limit member 112 and the inflation hood 10.

[0065] The limiting member 112 can improve the connection stability between the elastic member 111 and the support plate 110 , thereby effectively improving the use stability of the elastic member 111 .

[0066] In this embodiment, a slot may be provided on the support plate 110 , and the limiting member 112 is fixedly connected to the support plate 110 by being inserted into the slot.

[0067] In order to further improve the use range of the inflatable hood assembly 1, a plurality of slots can be provided on the support plate 110, and the plurality of slots are spaced apart along the extension direction of the elastic member 111. By inserting the stopper 112 into different slots, the tension of the elastic member 111 can be adjusted, so that the opening side of the inflatable hood 10 is stably fitted with the inner wall of the pipe 3.

[0068] like Figure 2 As shown, the inflation hood assembly 1 provided in this embodiment may further include a sliding fixing sleeve 12, which may be fixed to the first air nozzle 100 by a threaded connection, and the sliding fixing sleeve 12 is located on the side of the limiting member 112 facing away from the inflation hood 10.

[0069] During use, the elastic member 111 can be used to automatically adjust the radial spacing of the inflation hood 10 relative to the rotating shaft 20 at a position near the end of the pipe 3. After adjustment, the sliding fixing sleeve 12 is rotated on the first air nozzle 100 until the sliding fixing sleeve 12 abuts against the side of the limiting member 112 facing away from the inflation hood 10. At this time, the sliding fixing sleeve 12 can fix the expansion and contraction amount of the elastic member 111, thereby fixing the radial spacing of the inflation hood 10 relative to the rotating shaft 20, effectively ensuring the abutment stability between the inflation hood 10 and the inner wall of the pipe 3.

[0070] like Figure 2 As shown, the inflatable hood assembly 1 further includes a guide structure 13 , which is installed between the support plate 110 and the inflatable hood 10 and is used to limit the movement of the inflatable hood 10 along the extension and contraction direction of the elastic member 111 .

[0071] When the elastic member 111 is used to adjust the radial spacing of the inflatable hood 10 relative to the rotating shaft 20, the guide structure 13 can limit the inflatable hood 10 to move only along the extension and contraction direction of the elastic member 111, so that the inflatable hood 10 can only move radially along the rotating shaft 20, effectively ensuring the position adjustment accuracy of the inflatable hood 10.

[0072] like Figure 2 As shown, the guide structure 13 may include a guide frame 130 and a limiting ring 131. The guide frame 130 is an inverted U-shaped structure, and the guide frame 130 is formed by sequentially connecting a first guide rod, a fixing member, and a second guide rod; the fixing member is fixed to the side of the inflatable hood 10 facing the elastic member 111, and the elastic member 111 abuts between the fixing member and the limiting member 112; the limiting rings 131 are respectively fixed at the positions of the support plate 110 corresponding to the first guide rod and the second guide rod, and the first guide rod and the second guide rod are respectively inserted into the two limiting rings 131 on the support plate 110 along the extension and contraction direction of the elastic member 111.

[0073] like Figure 4 As shown, the support frame structure 21 includes a bearing seat 210 and a plurality of telescopic arms 211; the rotating shaft 20 is rotatably connected to the bearing seat 210, one end of the plurality of telescopic arms 211 is fixed on the outer peripheral wall of the bearing seat 210 at intervals along the circumference of the bearing seat 210, and the other ends of the plurality of telescopic arms 211 are respectively detachably connected to the ends of the pipes 3 to be welded.

[0074] A bearing 2100 is installed in the bearing seat 210, and the bearing 2100 is connected to the rotating shaft 20. The bearing 2100 and the bearing seat 210 are used to realize the rotation connection between the support frame structure 21 and the rotating shaft 20. The multiple telescopic arms 211 can not only improve the installation stability between the support frame structure 21 and the pipeline 3, but also make the support frame structure 21 adapt to pipelines 3 of different diameters by using their own telescopic arms.

[0075] The telescopic arm 211 may also be a telescopic tube formed by sequentially sleeved multiple tubes, a screw structure with a nut, or an electric push rod.

[0076] In order to improve the stability of the telescopic arm 211 during use, the telescopic arm 211 in this embodiment preferably includes two support arms, and both support arms are provided with strip holes extending along the length direction thereof. The two support arms are arranged in a close fit and the strip holes on the two support arms are connected, and a bolt and nut assembly 2110 is installed at the connecting point of the strip holes of the two support arms.

[0077] When the length of the telescopic arm 211 needs to be adjusted, the bolt and nut assembly 2110 can be loosened, and then one of the arms can be moved along the length direction of the telescopic arm 211 until the total length of the arm and the other arm meets the length adjustment requirement of the telescopic arm 211. Then the bolt and nut assembly 2110 can be tightened, and the two arms can be clamped and fixed using the bolt and nut assembly 2110, thereby limiting the relative movement of the two arms to ensure the overall structural stability of the telescopic arm 211.

[0078] like Figure 4 As shown, each telescopic arm 211 is provided with a clamping piece 212 at the end away from the bearing seat 210 , and the telescopic arm 211 is detachably connected to the end of the pipe 3 to be welded via the clamping piece 212 .

[0079] The clamping member 212 is used to realize a detachable connection between the support frame structure 21 and the pipeline 3, thereby facilitating the installation and removal of the support frame structure 21 and effectively improving the ease of use of the support frame structure 21.

[0080] The clamping member 212 may be a G-shaped clamp.

[0081] Specifically, Figure 4 As shown, the clamping member 212 includes a clamping screw and a U-shaped clamp, one end of the clamp is fixedly connected to the end of the telescopic arm 211 away from the bearing seat 210, and the other end of the clamp is provided with a threaded hole adapted to the clamping screw, and the axial direction of the threaded hole is parallel to the telescopic direction of the telescopic arm 211, and the clamping screw is threadedly connected to the threaded hole of the clamp.

[0082] The space between the end of the clamping screw near the telescopic arm 211 and the side wall of the clamp is used to accommodate the side wall of the pipe 3. By rotating the clamping screw in the threaded hole of the clamp, the distance between the end of the clamping screw and the side wall of the clamp can be changed, thereby achieving the clamping and loosening of the pipe 3 by the clamping member 212.

[0083] Further, such as Figure 4 As shown, a wrench rod may be vertically connected to the rod body of the clamping screw outside the clamp, and the wrench rod is used to drive the clamping screw to rotate in the threaded hole of the clamp, thereby improving the convenience of use of the clamping member 212.

[0084] In addition, if Figure 4 As shown, a hand wheel 200 may be fixed to the end of the rotating shaft 20 away from the inflatable cover assembly 1. The hand wheel 200 is used to drive the rotating shaft 20 to rotate, thereby improving the convenience of use of the welding inflatable protective device.

[0085] Furthermore, in this embodiment, the hand wheel 200 is preferably coaxially connected to the rotating shaft 20 .

[0086] When the hand wheel 200 is coaxially connected to the rotating shaft 20, it can prevent the rotating shaft 20 from causing the device to vibrate during operation, thereby ensuring the stability of the pipeline 3 during the welding process.

[0087] It can be seen that the welding inflatable protective device provided in this embodiment can realize the installation process of the support frame structure 21 at the end of the pipeline 3 by using the clamp 212 and the telescopic arm 211, and effectively improve the convenience of using the support frame structure 21. The support frame structure 21 only requires one worker to complete the length adjustment and installation process, without the need for multiple types of work and multiple people to jointly operate, which greatly improves the convenience of using the welding inflatable protective device.

[0088] like Figure 1 and Figure 5 As shown, the support assembly 2 also includes an auxiliary support structure 22 that can be folded or unfolded; the auxiliary support structure 22 is installed at a position of the rotating shaft 20 close to the inflatable hood assembly 1, and the auxiliary support structure 22 is used to abut against the inner wall of the pipe 3 to be welded when unfolded.

[0089] When the auxiliary support structure 22 is unfolded, the auxiliary support structure 22 can use its abutment relationship with the inner wall of the pipe 3 to support the position of the rotating shaft 20 close to the inflatable hood assembly 1, thereby cooperating with the support frame structure 21 to effectively ensure the position stability of the rotating shaft 20 in the pipe 3, and improve the position stability of the inflatable hood assembly 1 in the pipe 3.

[0090] When the auxiliary support structure 22 is folded, the auxiliary support structure 22 shrinks around the rotating shaft 20 , which effectively reduces the floor space occupied by the auxiliary support structure 22 and improves the convenience of storage of the auxiliary support structure 22 .

[0091] In practical applications, the auxiliary support structure 22 may be a telescopic device such as a scissor-type telescopic frame, or an inflatable airbag.

[0092] In order to improve the supporting stability and ease of use of the auxiliary supporting structure 22, in this embodiment, the auxiliary supporting structure 22 is preferably an umbrella-shaped structure. Figure 5 As shown, the auxiliary support structure 22 includes a main cylinder body 220, a driving member 221 and a plurality of hinged rods 222; the main cylinder body 220 is sleeved and fixed outside the rotating shaft 20, and the two ends of the hinged rod 222 are respectively a hinged end and a free end, and the hinged ends of the plurality of hinged rods 222 are distributed at intervals along the circumference of the main cylinder body 220 and are all hinged to the outer wall of the main cylinder body 220; each hinged rod 222 is connected to the driving member 221, and the driving member 221 is used to drive the hinged rod 222 to rotate with its hinged end as the rotation center, so that the free end of the hinged rod 222 is away from the rotating shaft 20.

[0093] Before placing the inflatable hood assembly 1 in the pipe 3 , the auxiliary support structure 22 may be unfolded first, and then the rotating shaft 20 , the unfolded auxiliary support structure 22 and the inflatable hood assembly 1 may be inserted into the pipe 3 together.

[0094] When unfolding the auxiliary support structure 22, the driving member 221 can be used to first drive the hinged rod 222 to rotate with its hinged end as the rotation center, and make the free ends of multiple hinged rods 222 away from the rotating shaft 20. At this time, multiple hinged rods 222 are unfolded on the peripheral side of the rotating shaft 20 to form an unfolded umbrella-like structure, and the free end of each hinged rod 222 can abut against the inner wall of the pipe 3, thereby forming a stable support for the rotating shaft 20.

[0095] It should be noted that the radial spacing between the free end of the hinge rod 222 and the rotating shaft 20 can also be adjusted by adjusting the driving stroke of the driving member 221, so that the deployed auxiliary support structure 22 can adapt to pipes 3 of different diameters.

[0096] The driving member 221 may be a tensioning mechanism with a winding rope, or a gear mechanism with a spring on an existing automatic umbrella, or a telescopic device such as an electric push rod.

[0097] In order to improve the convenience of use and structural reliability of the driving member 221, as Figure 5 As shown, in this embodiment, the outer wall of the main cylinder body 220 is preferably provided with an external thread extending spirally along its axial direction, and the driving member 221 includes a butt sleeve 2210, a threaded sleeve 2211 and a plurality of connecting rods 2212; the butt sleeve 2210 is sleeved on the outside of the main cylinder body 220 and is spaced apart from the hinged ends of the plurality of hinged rods 222, the threaded sleeve 2211 is sleeved on the outside of the main cylinder body 220 and is threadedly connected to the main cylinder body 220, and the threaded sleeve 2211 abuts against the side of the butt sleeve 2210 away from the hinged end of the hinged rod 222; the plurality of connecting rods 2212 are hinged one by one between the rod bodies of the plurality of hinged rods 222 and the outer peripheral wall of the butt sleeve 2210.

[0098] When the auxiliary support structure 22 needs to be unfolded, the threaded sleeve 2211 can be rotated on the main cylinder 220, so that the threaded sleeve 2211 can be used to drive the abutment sleeve 2210 to move close to the hinged end of the hinged rod 222. At this time, the abutment sleeve 2210 will drive the connecting rod 2212 to rotate, thereby driving the hinged rod 222 to rotate and making the free end of the hinged rod 222 away from the rotating axis 20.

[0099] When the radial spacing between the free end of the articulated rod 222 and the rotating shaft 20 is adjusted to the right position, stop rotating the threaded sleeve 2211. At this time, the abutment relationship between the free end of the articulated rod 222 and the inner wall of the pipe 3 can limit the abutment sleeve 2210 from continuing to move closer to the articulated end of the articulated rod 222. The threaded connection relationship between the threaded sleeve 2211 and the main cylinder body 220 can limit the abutment sleeve 2210 from moving away from the articulated end of the articulated rod 222, thereby effectively ensuring the stability of the unfolded state of the auxiliary support structure 22.

[0100] Further, such as Figure 5 As shown, the auxiliary support structure 22 further includes a reset member 223 , and a reset member 223 is connected between each hinge rod 222 and the main cylinder 220 . The reset member 223 is used to store energy when the free end of the hinge rod 222 is away from the rotating shaft 20 .

[0101] The reset member 223 can adopt an elastic structure such as a spring. When the driving member 221 drives the hinged rod 222 to rotate and makes the free end of the hinged rod 222 move away from the rotating shaft 20, it is necessary to overcome the elastic force of the reset member 223 so that the reset member 223 can store energy. Therefore, when the auxiliary support structure 22 needs to be folded, the reset member 223 can release energy as long as the driving action of the contact driving member 221 on the hinged rod 222, thereby driving the hinged rod 222 to rotate in the opposite direction and making the free end of the hinged rod 222 close to the rotating shaft 20, so as to achieve the purpose of folding the hinged rod 222 to one side of the rotating shaft 20.

[0102] It should be noted that when the driving member 221 includes a contact sleeve 2210, a threaded sleeve 2211 and a plurality of connecting rods 2212, the reset member 223 can be connected between the connecting rod 2212 and the main cylinder 220. When the auxiliary support structure 22 is in a folded state, the threaded sleeve 2211 is away from the free end of the hinged rod 222, and the reset member 223 applies a pulling force between the connecting rod 2212 and the main cylinder 220, so that the connecting rod 2212 approaches and folds to one side of the main cylinder 220. At the same time, the connecting rod 2212 drives the hinged rod 222 to fold to one side of the main cylinder 220 and the rotating shaft 20.

[0103] When the auxiliary support structure 22 is in the unfolded state, the threaded sleeve 2211 drives the abutting sleeve 2210 to approach the free end of the hinged rod 222, and stretches the reset member 223 through the connecting rod 2212, so that the reset member 223 stores energy. When the auxiliary support structure 22 needs to be folded, it is only necessary to rotate the threaded sleeve 2211 on the main cylinder 220 so that the threaded sleeve 2211 moves away from the free end of the hinged rod 222. At this time, the reset member 223 releases energy under the elastic recovery effect, thereby pulling the connecting rod 2212 and the hinged rod 222 to approach and fold to one side of the main cylinder 220 and the rotating shaft 20, and at the same time pushing the abutting sleeve 2210 to move away from the free end of the hinged rod 222, so as to realize the folding process of the auxiliary support structure 22.

[0104] In this embodiment, if Figure 5 As shown, the free end of the hinge rod 222 may be equipped with a roller 224, which is used to convert the sliding friction between the hinge rod 222 and the inner wall of the pipe 3 into rolling friction, which can effectively improve the smoothness of the auxiliary support structure 22 entering and exiting the pipe 3, and realize the rapid introduction and withdrawal of the auxiliary support structure 22, thereby reducing the preparation time before welding and effectively improving the welding operation efficiency. At the same time, the roller 224 can also reduce the scratches on the inner wall of the pipe 3 caused by the hinge rod 222.

[0105] In order to further reduce the scratches on the inner wall of the pipe 3 by the hinged rod 222, the roller 224 can be made of a flexible material such as nylon, or the roller 224 can be covered with a protective film layer made of a flexible material such as nylon.

[0106] It should be noted that, in order to improve the stability and balance of the auxiliary support structure 22 entering the pipeline 3, the end of the connecting rod 2212 away from the abutting sleeve 2210 can also abut against the inner wall of the pipeline 3. At this time, in order to reduce the scratches of the connecting rod 2212 on the inner wall of the pipeline 3, the end of the connecting rod 2212 away from the abutting sleeve 2210 can also be installed with a roller 224, and the material of the roller 224 can also be selected from nylon or the roller 224 is covered with a protective film layer.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding gas protection device, characterized in that: It comprises an inflatable hood assembly (1) and a bracket assembly (2); The inflatable hood assembly (1) comprises an inflatable hood (10) and a telescopic structure (11); the support assembly (2) comprises a rotating shaft (20) and a support frame structure (21); The telescopic structure (11) and the support frame structure (21) are arranged on the rotating shaft (20) at intervals, and the inflatable cover (10) is installed on the telescopic structure (11); the telescopic structure (11) is used to be telescopic along the radial direction of the rotating shaft (20), and the inflatable cover (10) is used to cover the inner side of the local docking interface (30) between the two adjacent pipes (3) when the rotating shaft (20) extends into the interior of the two adjacent pipes (3) to be welded; The rotating shaft (20) is rotatably connected to the support frame structure (21); the support frame structure (21) is used to be fixed at the end of the pipe (3) to be welded; the rotating shaft (20) is used to rotate to drive the telescopic structure (11) and the inflation hood (10) to rotate along the circumferential direction of the rotating shaft (20).

2. The welding gas protection device according to claim 1, characterized in that: The telescopic structure (11) comprises a support plate (110) and an elastic member (111); the support plate (110) is fixed on the rotating shaft (20); and the elastic member (111) is connected between the support plate (110) and the inflatable hood (10).

3. The welding gas protection device according to claim 2, characterized in that: The side of the inflation hood (10) facing away from its opening is connected to a first air nozzle (100), and the elastic member (111) is a hollow structure and the elastic member (111) is sleeved outside the first air nozzle (100).

4. The welding gas protection device according to claim 3, characterized in that: The telescopic structure (11) further comprises a limiting member (112); The limiting member (112) is fixed on the support plate (110) and is provided with a through hole, and an end of the first gas nozzle (100) away from the inflation cover (10) passes through the through hole on the limiting member (112) and then extends to a side of the limiting member (112) close to the rotating shaft (20); The elastic member (111) abuts between the limiting member (112) and the inflation cover (10).

5. The welding gas protection device according to claim 2, characterized in that: The inflatable hood assembly (1) further comprises a guide structure (13), wherein the guide structure (13) is installed between the support plate (110) and the inflatable hood (10) and is used to limit the movement of the inflatable hood (10) along the extension and contraction direction of the elastic member (111).

6. The welding gas protection device according to any one of claims 1 to 5, characterized in that: The support frame structure (21) comprises a bearing seat (210) and a plurality of telescopic arms (211); The rotating shaft (20) is rotatably connected to the bearing seat (210), one end of the plurality of telescopic arms (211) is fixed to the outer peripheral wall of the bearing seat (210) at intervals along the circumference of the bearing seat (210), and the other ends of the plurality of telescopic arms (211) are respectively detachably connected to the ends of the pipes (3) to be welded.

7. The welding gas protection device according to claim 6, characterized in that: The end of each telescopic arm (211) away from the bearing seat (210) is provided with a clamping piece (212), and the telescopic arm (211) is detachably connected to the end of the pipe (3) to be welded via the clamping piece (212).

8. The welding gas protection device according to any one of claims 1 to 5, characterized in that: The support assembly (2) further comprises an auxiliary support structure (22) capable of being folded or unfolded; The auxiliary support structure (22) is installed at a position of the rotating shaft (20) close to the inflatable hood assembly (1), and the auxiliary support structure (22) is used to abut against the inner wall of the pipe (3) to be welded when unfolded.

9. The welding gas protection device according to claim 8, characterized in that: The auxiliary support structure (22) comprises a main cylinder (220), a driving member (221) and a plurality of hinged rods (222); The main cylinder (220) is sleeved and fixed outside the rotating shaft (20); the two ends of the hinge rod (222) are respectively a hinge end and a free end; the hinge ends of the plurality of hinge rods (222) are distributed at intervals along the circumference of the main cylinder (220) and are all hinged to the outer wall of the main cylinder (220); Each of the hinged rods (222) is connected to the driving member (221), and the driving member (221) is used to drive the hinged rod (222) to rotate with its hinged end as the rotation center, so that the free end of the hinged rod (222) is away from the rotation axis (20).

10. The welding gas protection device according to claim 9, characterized in that: The auxiliary support structure (22) further comprises a reset member (223), wherein the reset member (223) is connected between each of the hinged rods (222) and the main cylinder (220), and the reset member (223) is used for storing energy when the free end of the hinged rod (222) is away from the rotating shaft (20).

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