An in-pipe welding device and welding method suitable for a hydrogen delivery pipeline

Abstract

The present application relates to the technical field of pipe welding, in particular to a pipe welding device and method suitable for hydrogen conveying pipeline, which mainly comprises a supporting arm, a body is installed on the bottom surface of the supporting arm, a welding head is installed on the bottom of the body, and further comprises: an air suction mechanism, which is arranged on one side of the supporting arm; an adjusting mechanism, which is arranged on one side of the supporting arm; and a cleaning mechanism, which is arranged on one side of the supporting arm. By opening the air cylinder, the connecting plate and the fixed plate are driven to rotate by a certain angle, the installation shell one and the fixed pipe are driven to swing by a certain angle, and the connecting pipe and the air suction head are driven to swing by a certain angle, so as to adjust the angle of the air suction head to be opposite to the inner wall of the pipeline. When welding on the inner wall of the pipeline, the bellows, the fixed pipe and the connecting pipe are used to suck the toxic and harmful substances such as ozone, nitrogen oxides and metal dust generated by welding from the air suction head, so that the toxic smoke is not easy to accumulate in the pipeline, thereby ensuring the safety of the on-site operators, reducing the risk of combustion and explosion and the safety hazard.

Description

Technical Field

[0001] This invention relates to the field of pipe welding technology, specifically to a pipe welding device and welding method suitable for hydrogen transportation pipelines. Background Technology

[0002] The internal welding device for hydrogen pipelines is an automatic welding machine for the circumferential seams inside high-pressure hydrogen pipelines. It primarily uses plasma arc welding machines to meet the high cleanliness, zero impurities, and high sealing requirements of hydrogen pipelines. The equipment integrates a walking mechanism, hydraulic tensioning and centering, welding torch rotation, argon gas protection, and an intelligent control system. It can autonomously enter the pipe to locate the weld seam and automatically complete the root pass welding, eliminating the need for manual pipe entry. It effectively prevents internal wall oxidation and weld slag residue, eliminates the risk of hydrogen leakage, and is suitable for field construction of long-distance hydrogen energy pipelines.

[0003] In pipeline welding operations, existing equipment only has welding functions and lacks a supporting fume treatment structure. Due to the confined and narrow space inside the pipeline, toxic and harmful substances such as ozone, nitrogen oxides and metal fumes generated by plasma arc welding are difficult to dissipate and accumulate in large quantities. The toxic fumes accumulated inside the pipe can not only damage the respiratory system of on-site workers and cause heavy metal poisoning, but also pose a hidden risk of flammability and explosion, posing a significant safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide an in-pipe welding apparatus and welding method suitable for hydrogen transportation pipelines, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An in-pipe welding device suitable for hydrogen transportation pipelines includes: a support arm, a body mounted on the bottom surface of the support arm, a welding head mounted on the bottom of the body, a fixing rod and an air blowing pipe mounted on the side of the support arm, a connecting block mounted on the outer wall of the fixing rod, and a detector mounted on the side of the connecting block; and further includes:

[0007] The suction mechanism is located on one side of the support arm. The suction mechanism includes a suction head located below the support arm. A connecting pipe is installed at one end of the suction head. The connecting pipe is rotatably connected to a fixed pipe through a connector. A corrugated pipe is installed at one end of the fixed pipe.

[0008] An adjustment mechanism is located on one side of the support arm. The adjustment mechanism includes a circular sleeve fixedly installed on the outer wall of the connecting pipe. Two fixing strips are fixedly installed on the side of the circular sleeve. The fixing strips are provided with cross grooves. A cross block is slidably installed on the inner wall of the cross groove.

[0009] The cleaning mechanism is located on one side of the support arm and includes a movable block located inside the suction head, with a scraper mounted on the side of the movable block.

[0010] Preferably, a fixing plate is hinged to one end of the support arm, a connecting plate is fixedly installed on the side of the fixing plate, a fixing frame is fixedly installed on the side of the support arm, a cylinder is hinged to the inner wall of the fixing frame, and one end of the cylinder is hinged to the connecting plate.

[0011] Preferably, a mounting shell is rotatably mounted on the side of the fixing plate via a rotating shaft, a limit post is fixedly mounted on the side of the mounting shell, and an arc-shaped groove is provided through the fixing plate, with the outer wall of the limit post slidingly connected to the inner wall of the arc-shaped groove.

[0012] Preferably, two limiting strips are fixedly installed on the outer wall of the fixed pipe, and a stop block is fixedly installed on the side of the limiting strip. A second mounting shell is provided on one side of the first mounting shell. Both the inner walls of the first and second mounting shells are provided with limiting grooves, and the inner walls of the limiting grooves abut against the limiting strips.

[0013] Preferably, a fixing block is fixedly installed on one side of the mounting shell, the fixing block has a cavity inside, a movable plate is slidably installed on the inner wall of the cavity, the side of the movable plate is elastically connected to the inner wall of the cavity through an elastic element, a pressing plate is fixedly installed on the top surface of the movable plate, a through groove is provided through the cavity, and the inner wall of the through groove is slidably connected to the side of the pressing plate.

[0014] Preferably, the mounting shell has sliding grooves on two sides, and the inner wall of the sliding grooves has a slot. The side of the fixing block is slidably connected to the inner wall of the sliding groove. The side of the moving plate is fixedly installed with a slot. One end of the slot slides through the cavity and engages with the slot. The side of the suction head has a groove.

[0015] Preferably, a fixing frame is fixedly installed on the outer wall of the fixing tube, the inner wall of the fixing frame is slidably connected to the side of the fixing strip, and multiple locking holes are provided on the side of the fixing frame.

[0016] Preferably, two locking posts are fixedly installed on the side of the cross block, and the locking posts are engaged with the locking holes. A pull rod is fixedly installed on the side of the cross block. One end of the pull rod slides through the inner wall of the cross groove and extends to the outside of the fixing strip. An elastic element two is movably installed on the outer wall of the pull rod. The two ends of the elastic element two abut against the side of the cross block and the inner wall of the cross groove, respectively.

[0017] Preferably, the suction head has a cavity inside, the inner wall of the cavity is slidably connected to the side of the moving block, one end of the scraper slides through the inner wall of the cavity and extends to the outside of the suction head, a support strip is fixedly installed on the side of the moving block, and the other end of the support strip slides through the inner wall of the cavity and abuts against the side of the cross block.

[0018] An internal welding method suitable for hydrogen transportation pipelines includes the following steps:

[0019] S1: Move the equipment to the inside of the pipeline and use the machine body to drive the welding head to weld the inner wall of the pipeline;

[0020] S2: During the welding process, the suction head absorbs toxic and harmful substances such as ozone, nitrogen oxides and metal fumes generated inside the pipe, making it difficult for toxic fumes to accumulate inside the pipe, thereby ensuring the safety of on-site workers and reducing the risk of explosion and safety hazards.

[0021] S3: After welding, adjust the equipment so that the scraper contacts the inner wall of the pipe. The pipe rotates, and the scraper scrapes off the welding slag produced during welding. Then, the suction head sucks up and removes the cleaned welding slag to ensure the quality of the welding on the inner wall of the pipe.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention utilizes a cylinder to rotate the connecting plate and the fixing plate by a certain angle, which in turn causes the mounting shell and the fixing pipe to swing by a certain angle, and the connecting pipe and the suction head to swing by a certain angle. By adjusting the angle of the suction head to face the inner wall of the pipe, during welding on the inner wall of the pipe, the corrugated pipe, the fixing pipe, and the connecting pipe absorb toxic and harmful substances such as ozone, nitrogen oxides, and metal fumes generated during welding from the suction head. This prevents the accumulation of toxic fumes inside the pipe, thereby ensuring the safety of on-site workers and reducing the risk of combustion and explosion and other safety hazards.

[0024] By pushing the push plate, the moving plate and the locking block are moved. The moving plate squeezes the elastic element one, and the moving plate drives the locking block to move out of the slot. At this time, the mounting shell two can be removed, so that the fixed tube and the suction head on one side can be removed. When the suction head is damaged after long-term use, it is convenient to replace and repair the suction head, thus improving work efficiency.

[0025] By pulling the lever, the cross block moves and compresses the second elastic element. The cross block moves the locking pin out of the locking hole. At this time, the fixing bar can be rotated, causing the sleeve, connecting pipe, and suction head to rotate at a certain angle, and the scraper to rotate at a certain angle. The lever is then loosened, and the second elastic element rebounds, pushing the cross block and locking pin to move. The locking pin engages with the locking hole, thus fixing the sleeve, connecting pipe, and suction head, and further fixing the scraper. This allows the scraper to be adjusted to scrape away the weld slag on both sides of the transverse or circumferential weld seam on the inner wall of the pipe, ensuring a smooth weld seam and improving welding quality.

[0026] When the scraper removes welding slag from the inner wall of the pipe, if there are protrusions inside the pipe, the scraper contacts the protrusions, the protrusions push the scraper to move, the scraper drives the moving block and support bar to move, and the support bar pushes the cross block to squeeze the elastic element two, so that the scraper has a certain buffer, ensuring that the scraper is not easily damaged and improving the service life of the equipment. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is an exploded three-dimensional view of the air blowing pipe of the present invention;

[0029] Figure 3 This is a three-dimensional structural diagram of the suction head of the present invention;

[0030] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 For the present invention Figure 3 Enlarged view at point B in the middle;

[0032] Figure 6 This is an exploded view of the three-dimensional structure of the connector of the present invention;

[0033] Figure 7 This is a schematic cross-sectional view of the three-dimensional structure of the fixing block of the present invention;

[0034] Figure 8 This is a schematic cross-sectional view of the three-dimensional structure of the suction head of the present invention.

[0035] In the picture:

[0036] 1. Support arm; 101. Body; 102. Welding head; 103. Fixing rod; 104. Connecting block; 105. Detector; 106. Air blowing pipe;

[0037] 2. Suction Mechanism; 201. Fixing Plate; 202. Connecting Plate; 203. Fixing Frame; 204. Cylinder; 205. Mounting Housing 1; 206. Rotating Shaft; 207. Limiting Post; 208. Arc-shaped Groove; 209. Fixing Pipe; 210. Corrugated Pipe; 211. Suction Head; 212. Connecting Pipe; 213. Connector; 214. Groove; 215. Fixing Block; 216. Cavity; 217. Moving Plate; 218. Locking Block; 219. Elastic Component 1; 220. Through Groove; 221. Pressing Plate; 222. Mounting Housing 2; 223. Limiting Groove; 224. Limiting Strip; 225. Stop Block; 226. Slide Groove; 227. Locking Slot;

[0038] 3. Adjustment mechanism; 301. Fixing frame; 302. Clip hole; 303. Round sleeve; 304. Fixing strip; 305. Cross groove; 306. Cross block; 307. Clip post; 308. Pull rod; 309. Elastic element two;

[0039] 4. Cleaning mechanism; 401. Cavity; 402. Moving block; 403. Scraper; 404. Support bar. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0042] like Figures 1-8 As shown, this application provides an in-pipe welding device suitable for hydrogen transportation pipelines, including: a support arm 1, an organism 101 mounted on the bottom surface of the support arm 1, a welding head 102 mounted on the bottom of the organism 101, a fixing rod 103 and an air blowing pipe 106 mounted on the side of the support arm 1, a connecting block 104 mounted on the outer wall of the fixing rod 103, and a detector 105 mounted on the side of the connecting block 104.

[0043] The suction mechanism 2 is located on one side of the support arm 1. The suction mechanism 2 includes a suction head 211 located below the support arm 1. A connecting pipe 212 is installed at one end of the suction head 211. A fixed pipe 209 is rotatably connected to the connecting pipe 212 through a connector 213. A corrugated pipe 210 is installed at one end of the fixed pipe 209.

[0044] Specifically, such as Figures 1-2 As shown, a fixing plate 201 is hinged to one end of the support arm 1, a connecting plate 202 is fixedly installed on the side of the fixing plate 201, a fixing frame 203 is fixedly installed on the side of the support arm 1, and a cylinder 204 is hinged to the inner wall of the fixing frame 203. One end of the cylinder 204 is hinged to the connecting plate 202.

[0045] In this embodiment: the cylinder 204 can push the connecting plate 202 and the fixing plate 201 to swing at a certain angle, thereby causing the suction head 211 to swing at a certain angle.

[0046] Specifically, such as Figures 1-2 As shown, a mounting shell 205 is rotatably mounted on the side of the fixing plate 201 via a rotating shaft 206. A limiting post 207 is fixedly mounted on the side of the mounting shell 205. An arc-shaped groove 208 is provided through the fixing plate 201. The outer wall of the limiting post 207 is slidably connected to the inner wall of the arc-shaped groove 208.

[0047] In this embodiment: the limiting post 207 and the arc groove 208 are set to limit the limiting post 207, so that the limiting post 207 and the mounting shell 205 are more stable when they rotate at a certain angle, and the angle of the mounting shell 205 can be fixed.

[0048] Specifically, such as Figures 3-4 As shown, two limiting strips 224 are fixedly installed on the outer wall of the fixed tube 209. A stop block 225 is fixedly installed on the side of the limiting strip 224. A second mounting shell 222 is provided on one side of the first mounting shell 205. Limiting grooves 223 are provided on the inner walls of both the first mounting shell 205 and the second mounting shell 222. The inner wall of the limiting groove 223 abuts against the limiting strip 224.

[0049] In this embodiment: the limiting groove 223 limits the limiting strip 224 and further fixes the fixing tube 209, making it difficult for the fixing tube 209 to rotate. The stop block 225, the first mounting shell 205 and the second mounting shell 222 limit and lock the stop block 225, making it difficult for the stop block 225, the limiting strip 224 and the fixing tube 209 to slide or deviate.

[0050] Specifically, such as Figures 3-7 As shown, a fixing block 215 is fixedly installed on the side of the mounting shell 205. A cavity 216 is provided inside the fixing block 215. A movable plate 217 is slidably installed on the inner wall of the cavity 216. The side of the movable plate 217 is elastically connected to the inner wall of the cavity 216 through an elastic element 219. A pressing plate 221 is fixedly installed on the top surface of the movable plate 217. A through groove 220 is provided through the cavity 216. The inner wall of the through groove 220 is slidably connected to the side of the pressing plate 221.

[0051] In this embodiment: the cavity 216 limits the movement of the movable plate 217, making the movement of the movable plate 217 more stable; the elastic element 219 applies elastic force to the movable plate 217; and the pressing plate 221 can drive the movable plate 217 to compress the elastic element 219.

[0052] Specifically, such as Figure 4 As shown, the side of the mounting shell 222 is provided with a sliding groove 226, and the inner wall of the sliding groove 226 is provided with a slot 227. The side of the fixing block 215 is slidably connected to the inner wall of the sliding groove 226. The side of the moving plate 217 is fixedly installed with a slot 218. One end of the slot 218 slides through the cavity 216 and engages with the slot 227. The side of the suction head 211 is provided with a groove 214.

[0053] In this embodiment: by sliding one end of the set card block 218 through the cavity 216 and engaging with the card slot 227, the second mounting shell 222 and the first mounting shell 205 are connected and locked. The first mounting shell 205 and the second mounting shell 222 fix the fixing tube 209 and further fix the suction head 211.

[0054] The adjustment mechanism 3 is located on one side of the support arm 1. The adjustment mechanism 3 includes a round sleeve 303 fixedly installed on the outer wall of the connecting pipe 212. Two fixing strips 304 are fixedly installed on the side of the round sleeve 303. The fixing strips 304 are provided with cross grooves 305. A cross block 306 is slidably installed on the inner wall of the cross grooves 305.

[0055] Specifically, such as Figures 5-8 As shown, a fixing frame 301 is fixedly installed on the outer wall of the fixing tube 209. The inner wall of the fixing frame 301 is slidably connected to the side of the fixing strip 304. Multiple locking holes 302 are provided on the side of the fixing frame 301.

[0056] In this embodiment: the fixed frame 301 limits the fixed strip 304, and the fixed strip 304 drives the fixed frame 301, the connecting pipe 212 and the suction head 211 to rotate at a certain angle, which makes it more stable.

[0057] Specifically, such as Figures 5-8 As shown, two locking posts 307 are fixedly installed on the side of the cross block 306. The locking posts 307 are engaged with the locking holes 302. A pull rod 308 is fixedly installed on the side of the cross block 306. One end of the pull rod 308 slides through the inner wall of the cross groove 305 and extends to the outside of the fixing strip 304. An elastic element 309 is movably installed on the outer wall of the pull rod 308. The two ends of the elastic element 309 abut against the side of the cross block 306 and the inner wall of the cross groove 305, respectively.

[0058] In this embodiment: the cross block 306 is limited by the cross groove 305, so that the cross block 306 and the locking post 307 move more stably. The elastic element 309 applies elastic force to the cross block 306, and the locking post 307 engages with the locking hole 302, thereby fixing the fixing strip 304.

[0059] The cleaning mechanism 4 is located on one side of the support arm 1. The cleaning mechanism 4 includes a movable block 402 located inside the suction head 211. A scraper 403 is installed on the side of the movable block 402.

[0060] Specifically, such as Figure 8 As shown, the suction head 211 has a cavity 401 inside. The inner wall of the cavity 401 is slidably connected to the side of the moving block 402. One end of the scraper 403 slides through the inner wall of the cavity 401 and extends to the outside of the suction head 211. A support strip 404 is fixedly installed on the side of the moving block 402. The other end of the support strip 404 slides through the inner wall of the cavity 401 and abuts against the side of the cross block 306.

[0061] In this embodiment: the scraper 403 removes the welding slag from the inner wall of the welded pipe, ensuring the smoothness and cleanliness of the inner wall. The length of the scraper 403 extending out of the suction head 211 is much smaller than the length of the clamping post 307. When the scraper 403 moves under pressure, it drives the support bar 404 to pressurize the cross block 306 to move. At this time, when the cross block 306 drives the clamping post 307 to move, the clamping post 307 will not move out of the clamping hole 302, ensuring that the suction head 211 and the scraper 403 will not rotate.

[0062] An internal welding method suitable for hydrogen transportation pipelines includes the following steps:

[0063] S1: Move the equipment to the inside of the pipeline, and use the machine body 101 to drive the welding head 102 to weld the inner wall of the pipeline;

[0064] S2: During the welding process, the suction head 211 absorbs toxic and harmful substances such as ozone, nitrogen oxides and metal fumes generated inside the pipe, making it difficult for toxic fumes to accumulate inside the pipe, thereby ensuring the safety of on-site workers and reducing the risk of explosion and safety hazards.

[0065] S3: After welding is completed, adjust the equipment so that the scraper 403 contacts the inner wall of the pipe. The pipe rotates and the scraper 403 scrapes off the welding slag produced by welding. Then the suction head 211 sucks up and removes the removed welding slag to ensure the quality of welding on the inner wall of the pipe.

[0066] Specifically, this solution involves: the machine body 101 driving the welding head 102 to weld the inner wall of the pipe; activating the cylinder 204, causing the connecting plate 202 and the fixing plate 201 to rotate at a certain angle, which in turn causes the mounting shell 205 and the fixing pipe 209 to swing at a certain angle, and the connecting pipe 212 and the suction head 211 to swing at a certain angle. The angle of the suction head 211 is adjusted to face the inner wall of the pipe. During welding on the inner wall of the pipe, toxic and harmful substances such as ozone, nitrogen oxides, and metal fumes generated during welding are absorbed from the suction head 211 through the corrugated pipe 210, the fixing pipe 209, and the connecting pipe 212. Toxic fumes are less likely to accumulate inside the pipe, thus ensuring the safety of on-site workers and reducing the risk of explosion and safety hazards. After welding, the detector 105 is used for detection, causing the suction head 211 to move to the weld, pulling the pull rod 308, which moves the cross block 306 and compresses the elastic element 309. The cross block 306 moves the locking pin 307 out of the locking hole 302. At this time, the fixing bar 304 can be rotated, causing the round sleeve 303, connecting pipe 212 and suction head 211 to rotate a certain angle, which in turn causes the scraper 403 to rotate a certain angle, making the scraper 403 parallel to the pipe axis, and loosening the pull rod 308. 08. The elastic element 309 rebounds and pushes the cross block 306 and the locking post 307 to move. The locking post 307 engages with the locking hole 302, thereby fixing the round sleeve 303, the connecting pipe 212 and the suction head 211, and further fixing the scraper 403. The scraper 403 contacts the inner wall of the pipe. The pipe rotates, and the scraper 403 scrapes off the welding slag and sucks it up through the suction head 211. When there is a protrusion inside the pipe, the scraper 403 contacts the protrusion, and the protrusion pushes the scraper 403 to move. The scraper 403 drives the moving block 402 and the support bar 404 to move. The support bar 404 pushes the cross block 306 to compress the elastic element. Part 2 309 provides a certain buffer for scraper 403, ensuring that scraper 403 is not easily damaged and improving the service life of the equipment. After processing, by pushing the pressing plate 221, the moving plate 217 and the locking block 218 are moved. The moving plate 217 squeezes the elastic part 219, and the moving plate 217 drives the locking block 218 to move out of the slot 227. At this time, the mounting shell 222 can be removed, so that the fixed tube 209 and the suction head 211 on one side can be removed. When the suction head 211 is damaged after long-term use, it is convenient to replace and repair the suction head 211, thus improving work efficiency.

[0067] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0068] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An in-pipe welding apparatus suitable for hydrogen transportation pipelines, comprising: A support arm (1), on the bottom surface of which an organism (101) is mounted, a welding head (102) is mounted on the bottom of the organism (101), a fixing rod (103) and an air blowing pipe (106) are mounted on the side of the support arm (1), a connecting block (104) is mounted on the outer wall of the fixing rod (103), and a detector (105) is mounted on the side of the connecting block (104). The support arm (1) is characterized by further comprising: The suction mechanism (2) is located on one side of the support arm (1). The suction mechanism (2) includes a suction head (211) located below the support arm (1). A connecting pipe (212) is installed at one end of the suction head (211). A fixed pipe (209) is rotatably connected to the connecting pipe (212) through a connector (213). A corrugated pipe (210) is installed at one end of the fixed pipe (209). Adjustment mechanism (3) is provided on one side of support arm (1). The adjustment mechanism (3) includes a round sleeve (303) fixedly installed on the outer wall of connecting pipe (212). Two fixing strips (304) are fixedly installed on the side of the round sleeve (303). The fixing strips (304) are provided with cross grooves (305). A cross block (306) is slidably installed on the inner wall of the cross grooves (305). The cleaning mechanism (4) is located on one side of the support arm (1). The cleaning mechanism (4) includes a moving block (402) located inside the suction head (211). A scraper (403) is installed on the side of the moving block (402).

2. The pipe welding device suitable for hydrogen transportation pipelines according to claim 1, characterized in that, One end of the support arm (1) is hinged to a fixing plate (201), a connecting plate (202) is fixedly installed on the side of the fixing plate (201), a fixing frame (203) is fixedly installed on the side of the support arm (1), a cylinder (204) is hinged to the inner wall of the fixing frame (203), and one end of the cylinder (204) is hinged to the connecting plate (202).

3. The pipe welding device suitable for hydrogen transportation pipelines according to claim 2, characterized in that, The mounting plate (201) is rotatably mounted with a mounting shell (205) on its side via a rotating shaft (206). A limiting post (207) is fixedly mounted on the side of the mounting shell (205). An arc-shaped groove (208) is provided through the mounting plate (201). The outer wall of the limiting post (207) is slidably connected to the inner wall of the arc-shaped groove (208).

4. The pipe welding device suitable for hydrogen transportation pipelines according to claim 3, characterized in that, Two limiting strips (224) are fixedly installed on the outer wall of the fixed tube (209). A stop block (225) is fixedly installed on the side of the limiting strip (224). A second mounting shell (222) is provided on one side of the first mounting shell (205). A limiting groove (223) is provided on the inner wall of the first mounting shell (205) and the inner wall of the second mounting shell (222). The inner wall of the limiting groove (223) abuts against the limiting strip (224).

5. The pipe welding apparatus suitable for hydrogen transportation pipelines according to claim 4, characterized in that, A fixing block (215) is fixedly installed on the side of the mounting shell (205). A cavity (216) is provided inside the fixing block (215). A movable plate (217) is slidably installed on the inner wall of the cavity (216). The side of the movable plate (217) is elastically connected to the inner wall of the cavity (216) through an elastic element (219). A pressing plate (221) is fixedly installed on the top surface of the movable plate (217). A through groove (220) is provided through the cavity (216). The inner wall of the through groove (220) is slidably connected to the side of the pressing plate (221).

6. The pipe welding apparatus for hydrogen transportation pipelines according to claim 5, characterized in that, The mounting shell (222) has a sliding groove (226) on its side, and a slot (227) is provided on the inner wall of the sliding groove (226). The side of the fixing block (215) is slidably connected to the inner wall of the sliding groove (226). A locking block (218) is fixedly installed on the side of the moving plate (217). One end of the locking block (218) slides through the cavity (216) and engages with the slot (227). The suction head (211) has a groove (214) on its side.

7. The pipe welding apparatus suitable for hydrogen transportation pipelines according to claim 1, characterized in that, A fixing frame (301) is fixedly installed on the outer wall of the fixing tube (209). The inner wall of the fixing frame (301) is slidably connected to the side of the fixing strip (304). Multiple locking holes (302) are provided on the side of the fixing frame (301).

8. The pipe welding apparatus for hydrogen transportation pipelines according to claim 7, characterized in that, Two locking posts (307) are fixedly installed on the side of the cross block (306). The locking posts (307) are engaged with the locking holes (302). A pull rod (308) is fixedly installed on the side of the cross block (306). One end of the pull rod (308) slides through the inner wall of the cross groove (305) and extends to the outside of the fixing strip (304). An elastic element two (309) is movably installed on the outer wall of the pull rod (308). The two ends of the elastic element two (309) abut against the side of the cross block (306) and the inner wall of the cross groove (305) respectively.

9. The pipe welding device suitable for hydrogen transportation pipelines according to claim 1, characterized in that, The suction head (211) has a cavity (401) inside. The inner wall of the cavity (401) is slidably connected to the side of the moving block (402). One end of the scraper (403) slides through the inner wall of the cavity (401) and extends to the outside of the suction head (211). A support strip (404) is fixedly installed on the side of the moving block (402). The other end of the support strip (404) slides through the inner wall of the cavity (401) and abuts against the side of the cross block (306).

10. A method for in-pipe welding suitable for hydrogen transportation pipelines, applicable to the in-pipe welding apparatus for hydrogen transportation pipelines as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Move the equipment to the inside of the pipeline and use the machine body (101) to drive the welding head (102) to weld the inner wall of the pipeline; S2: During the welding process, the ozone, nitrogen oxides and metal fumes generated inside the pipe are absorbed by the suction head (211), so that the toxic and harmful substances are not easy to accumulate inside the pipe, thereby ensuring the safety of on-site workers and reducing the risk of explosion and safety hazards. S3: After welding, adjust the equipment so that the scraper (403) contacts the inner wall of the pipe. The pipe rotates and the scraper (403) scrapes off the welding slag produced by welding. Then the suction head (211) sucks up and removes the removed welding slag to ensure the quality of welding on the inner wall of the pipe.

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