High-pressure vessel tapping thick-wall forged pipe welding device

Abstract

The invention provides a high-pressure vessel trepanning thick-wall forged pipe welding device which comprises a fixing assembly for fixing two fixing semi-rings to a pipe body to be welded in a sleeving mode and a welding assembly arranged on the two fixing semi-rings forming an annular structure through a rotating assembly and used for welding the positions, to be welded, of the two pipe bodies. Fixing blocks with clamping grooves formed in the end faces are arranged on the side faces of the ends, away from the rotating connection ends, of the two fixing semi-rings, and when the two fixing semi-rings define an annular structure to be arranged on the pipe body in a sleeving mode, the clamping blocks can be fixed in the clamping grooves of the two fixing blocks; the fixing assembly comprises three positioning lead screws vertically penetrating through the outer ring face of the fixing semi-ring at equal intervals, a control piece arranged on the fixing semi-ring and controlling the positioning lead screws to synchronously move towards the inner ring face of the fixing semi-ring, and buffer pieces arranged at the ends, penetrating through the inner ring face of the fixing semi-ring, of the multiple positioning lead screws. The high-pressure container can be conveniently welded, and the welding quality of the high-pressure container is improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, in particular to a high-pressure container open-hole thick-wall forged pipe welding device. Background Art

[0002] At present, high-pressure vessels generally include a tube body and a base. The height of the base is generally 2m to 3m, and the diameter of the tube body is generally 2m, making the highest point of the high-pressure vessel as high as 4m. Due to its large size, high-pressure vessels are usually manufactured in sections and then spliced. When splicing, the tube body parts are butt-welded.

[0003] At present, the following welding operations are commonly used: 1. The welding machine is placed on the ground, and the welder holds the welding gun to weld the bottom and the bottom of the side. For the side or top, it needs to be completed on a ladder or directly squatting on the top of the pipe body. The surface of the pipe body of this type of high-pressure container is smooth, and there is no place to hang a safety belt. The operation is very dangerous. The welder and the ladder are easy to slip off the pipe body, posing a major safety hazard; 2. A special door-type bracket is equipped to facilitate the welder to climb and weld the side and top positions. This method increases the time and cost of mounting the bracket, and after welding, it needs to be removed, which is very inconvenient to operate; 3. A safety buckle is welded on the surface of the pipe body, and the welder ties the safety belt to the safety buckle, and ties the ladder to the safety buckle with a safety belt. After the pipe body is butt-welded, this operation method requires gas cutting off the safety buckle on the surface of the pipe body, and then grinding and flaw detection of the safety buckle welding position.

[0004] In the above-mentioned prior art, the thick wall welding of high-pressure containers is performed by workers holding a welding gun to weld the thick wall of the pipe body. However, the workers will become fatigued after working for a long time, resulting in a decrease in welding quality. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a high-pressure container open hole thick-wall forged pipe welding device, which can conveniently weld the high-pressure container and improve the welding quality of the high-pressure container.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-pressure container open-hole thick-wall forged pipe welding device, comprising two fixing half rings rotatably connected at one end and fixedly connected at the other end, a fixing assembly for sleeve-fixing the two fixing half rings on a pipe body to be welded, and a welding assembly for welding the two pipe bodies at the positions to be welded by the rotating assembly arranged on the two fixing half rings constituting the annular structure, wherein fixing blocks with grooves on the end faces are arranged on the side faces of the two fixing half rings away from the rotating connection, and the two fixing blocks can be fixed in the grooves of the two fixing blocks when the two fixing half rings are sleeved on the pipe body to form an annular structure;

[0007] The fixing assembly includes three equally spaced positioning screw rods vertically penetrating the outer ring surface of the fixing semi-ring, a control component arranged on the fixing semi-ring and controlling the positioning screw rods to synchronously move into the inner ring surface of the fixing semi-ring, and a buffer component arranged on one end portion of the multiple positioning screw rods penetrating the inner ring surface of the fixing semi-ring.

[0008] Preferably, the buffer component includes two buffer blocks arranged in parallel and one of them is fixed on the end face of one end of the inner ring surface of the fixed semi-ring through which the positioning screw rod passes, a first telescopic rod arranged between the two buffer blocks and whose two ends are respectively connected to the adjacent end faces of different buffer blocks, and a buffer spring movably sleeved on the rod body of the first telescopic rod and whose two ends are respectively connected to the adjacent end faces of the two buffer blocks.

[0009] Preferably, the control member includes a plurality of driven gears arranged in a fixed half ring and sleeved on a positioning screw rod body through a threaded connection, and a control structure arranged on two fixed half rings and controlling the synchronous rotation of the plurality of driven gears. A limiting groove is provided along the length direction of the positioning screw rod body, and a limiting bar connected to the fixed half ring is slidably arranged in the limiting groove.

[0010] Preferably, a rotating groove is provided on the outer ring surface of the two fixed half rings, and the control structure includes a rotating half ring slidably arranged in the rotating groove, a driven rack fixedly arranged on the side surfaces of both sides of the rotating half ring, and a driving gear passing through the end surface of one end of the fixed half ring and meshing with one of the driven racks, and a driven rack away from the driving gear is meshed with the driven gear.

[0011] Preferably, the welding assembly includes a distance adjusting rod with a bottom end arranged on a rotating assembly, a distance adjusting member arranged on the rod body of the distance adjusting rod, a support rod arranged laterally on one side of the distance adjusting rod and connected to the distance adjusting member, a vertical rod arranged in a vertical direction and fixedly connected at the top end to the bottom side surface of one end of the support rod away from the distance adjusting member, and two cross rods symmetrically arranged on both sides of the bottom end of the vertical rod, the two cross rods are rotatably connected to rotating blocks at one end away from each other, and the two rotating blocks can respectively fix the welding gun and the welding wire conveying structure.

[0012] Preferably, a rotating cylinder is rotatably arranged on the body of the support rod, and a cable connected to the welding gun is wound around the body of the rotating cylinder.

[0013] Preferably, the distance adjusting member includes a distance adjusting block movably arranged in a distance adjusting groove opened along the length direction of the side surface of the distance adjusting rod and connected to the end of the support rod on the side surface, and a fixed screw rod with one end passing through a through groove opened on the side surface of the distance adjusting rod adjacent to the distance adjusting groove and passing through the distance adjusting block and being threadedly connected to the distance adjusting block; a control block is fixedly arranged on the end of the fixed screw rod away from the distance adjusting block, and the through groove is opened along the length direction of the distance adjusting rod.

[0014] Preferably, the rotating assembly includes a driving ring arranged in a semi-annular driving groove on the end face of the fixed semi-ring, and the bottom end side of the pitch adjusting rod is fixedly connected to the driving ring away from the end face of one end of the fixed semi-ring.

[0015] The beneficial effects of the present invention are as follows: when welding a high-pressure container with an open hole and a thick-walled forged pipe, two pipe bodies to be welded are brought close to each other, two fixed semi-rings are rotated to open, the two fixed semi-rings are sleeved on one of the pipe bodies, and then the two fixed semi-rings are moved close to each other away from one end of the rotation connection, and a clamping block is inserted into the clamping groove provided in the two fixed blocks to fix the two fixed blocks, so that the two fixed semi-rings can form an annular structure, and a plurality of positioning screws arranged on the two fixed semi-rings are driven by a control member to move synchronously inwardly to the inner ring surface, and the ends of the plurality of positioning screws are closely fitted on the surface of the pipe body, so that the two fixed semi-rings can be stably fixed on the pipe body, and then the welding assembly arranged on the two fixed semi-rings by the rotating assembly is used to rotate and weld the pipe body to be welded, and the distance between the welding assembly and the position to be welded is conveniently adjusted by the distance adjusting assembly, so that the thick wall is gradually annularly welded from the inside to the outside, and the situation in the prior art that the welding error caused by the long-time welding of the staff and the reduction of the welding quality is avoided, the high-pressure container can be welded conveniently, and the welding quality of the high-pressure container is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 The present invention is a simplified structural schematic diagram of the high-pressure container hole thick-wall forged pipe welding device.

[0018] Figure 2 This is a schematic diagram of the back structure of the high-pressure container hole thick-wall forged pipe welding device proposed by the present invention.

[0019] Figure 3 The present invention is a schematic diagram of the expanded structure of the high-pressure container hole thick-wall forged pipe welding device proposed by the present invention.

[0020] Figure 4 It is a schematic diagram of the welding assembly structure of the present invention.

[0021] Figure 5 It is a schematic diagram of the internal structure of the fixed half ring of the present invention.

[0022] Figure 6 It is a schematic diagram of the rotating half ring structure of the present invention.

[0023] Figure 7 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0024] In the figure: 1. tube body; 2. fixed half ring; 3. rotating groove; 4. rotating half ring; 5. fixed block; 6. clamping block; 7. pitch-adjusting rod; 8. supporting rod; 9. rotating cylinder; 10. vertical rod; 11. horizontal rod; 12. rotating block; 13. positioning screw rod; 14. buffer block; 15. buffer spring; 16. driving gear; 17. driven rack; 18. connecting groove; 19. through groove; 20. pitch-adjusting groove; 21. pitch-adjusting block; 22. fixed screw rod; 23. control block; 24. limiting groove; 25. driven gear; 26. sealing block; 27. connecting block; 28. second telescopic rod; 29. ​​reset spring; 30. driving groove; 31. driving ring. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0026] See also Figure 1-7 A high-pressure container open-hole thick-wall forged pipe welding device, comprising two fixing half rings 2 with one end rotatably connected and the other end fixedly connected, a fixing assembly for sleeve-fixing the two fixing half rings 2 on a pipe body 1 to be welded, and a welding assembly for welding the two pipe bodies 1 at positions to be welded by a rotating assembly arranged on the two fixing half rings 2 forming an annular structure, wherein the two fixing half rings 2 are provided with fixing blocks 5 with end faces having slots on their end faces on the side faces away from the rotating connection ends, and when the two fixing half rings 2 are sleeved on the pipe body 1 to form an annular structure, a fixing block 6 can be fixed in the slots of the two fixing blocks 5;

[0027] The fixing assembly includes three equally spaced positioning screws 13 that vertically penetrate the outer ring surface of the fixing half ring 2, a control component that is arranged on the fixing half ring 2 and controls the positioning screws 13 to move synchronously into the inner ring surface of the fixing half ring 2, and a buffer component that is arranged on one end of the multiple positioning screws 13 that pass through the inner ring surface of the fixing half ring 2.

[0028] like Figure 1-7As shown, when welding the connection of the open hole forged pipe of the high-pressure container, the present application rotates the two fixed half rings 2 away from each other, and controls the two fixed half rings 2 to be sleeved on the side of the pipe body 1, and then controls the two fixed half rings 2 to rotate closer to each other at one end away from each other, so that the two fixed blocks 5 are close to each other, and the clamping block 6 is inserted into the clamping groove opened by the two fixed blocks 5, so as to facilitate the two fixed half rings 2 to be sleeved on the pipe body of the pipe body 1 in an annular structure, and then the two fixed half rings 2 are fixed on the pipe body 1 in an annular structure through the fixing assembly, and then the welding assembly is driven to rotate around the pipe body of the pipe body 1 around the axial direction through the rotating assembly, and the distance adjustment assembly is cooperated to drive the welding assembly to move to the welding position of the pipe body 1, and the welding assembly is driven to rotate by the rotating assembly, so that the welding position of the pipe body 1 can be welded, thereby avoiding the situation in the prior art that the staff welds for a long time and causes welding fatigue and welding errors, and the high-pressure container can be welded conveniently, thereby improving the welding quality of the high-pressure container.

[0029] The buffer component includes two buffer blocks 14 arranged in parallel, one of which is fixed on the end face of one end of the inner ring surface of the fixed half ring 2 and penetrated by the positioning screw rod 13, a first telescopic rod arranged between the two buffer blocks 14 and with two ends respectively connected to the adjacent end faces of different buffer blocks 14, and a buffer spring 15 movably sleeved on the rod body of the first telescopic rod and with two ends respectively connected to the adjacent end faces of the two buffer blocks 14.

[0030] like Figure 1-4 As shown, after the two fixed half rings 2 are sleeved on the tube body 1, the multiple positioning screws 13 penetrating the outer ring surface of the fixed half ring 2 are driven by the control member to move synchronously into the inner ring surface of the annular structure formed by the two fixed half rings 2, and when the buffer member arranged on the end of the positioning screw rod 13 is in contact with the side surface of the tube body 1, and when the control member drives the positioning screw rod 13 to move toward the surface of the tube body, the buffer spring 15 on the rod body of the first telescopic rod is compressed, thereby ensuring that the buffer members on the ends of the multiple positioning screw rods 13 are in contact with the side surface of the tube body 1. The block 14 fits tightly against the surface of the tube body 1, and multiple positioning screws 13 move synchronously on the two fixed semi-rings 2 to ensure that the buffer block 14 arranged on the end of each positioning screw 13 is at an equal distance from the axis of the inner ring surface of the annular structure composed of the two fixed semi-rings 2. Therefore, when the annular structure composed of the two fixed semi-rings 2 is sleeved on the tube body 1, it is ensured that the tube body 1 is located on the axis of the inner ring surface of the annular structure composed of the two fixed semi-rings 2, so that the welding assembly can be driven by the rotating assembly to rotate and weld on the surface of the tube body 1 later.

[0031] The control component includes a plurality of driven gears 25 which are arranged in the fixed half ring 2 and are sleeved on the rod body of the positioning screw rod 13 through threaded connection, and a control structure which is arranged on the two fixed half rings 2 and controls the synchronous rotation of the plurality of driven gears 25. A limiting groove 24 is provided on the rod body of the positioning screw rod 13 along the length direction, and a limiting bar connected to the fixed half ring 2 is slidably arranged in the limiting groove 24.

[0032] A rotating groove 3 is provided on the outer ring surface of the two fixed half rings 2. The control structure includes a rotating half ring 4 slidably arranged in the rotating groove 3, a driven rack 17 fixedly arranged on the side surfaces of both sides of the rotating half ring 4, and a driving gear 16 passing through the end surface of one end of the fixed half ring 2 and meshing with one of the driven racks 17, and a driven rack 17 away from the driving gear 16 is meshed with the driven gear 25.

[0033] When the two rotating ends of the two fixed half rings 2 are tightly fitted together, the two fixed half rings 2 form an annular structure, and the two rotating half rings 4 inserted in the rotating grooves 3 also form an annular structure.

[0034] like Figure 1-6 As shown, when the two fixed half rings 2 are formed into an annular structure and sleeved on the surface of the tube body 1, the driving gear 16 is driven by the motor to rotate, and the driving gear is meshed with one of the driven racks 17, so as to facilitate driving the two rotating half rings 4 inserted in the rotating grooves 3 to rotate in the rotating grooves 3, and the two rotating half rings 4 forming the annular structure can be driven to rotate in the two rotating grooves 3 forming the annular structure. At this time, the driven rack 17 arranged on the other side of the two rotating half rings 4 is meshed with the driven gear 25, and the driven gear 25 can be driven to rotate. The driven gear 25 is threadedly connected with the positioning screw 13. The positioning screw 13 is slidably set with a limit strip in a limit groove 24 provided on the side. The limit strip is connected to the fixed half ring 2, so that the positioning screw 13 can be limited to move along the length direction of the limit groove 24, thereby ensuring that when the driving gear 16 is rotated, the multiple positioning screws 13 arranged on the fixed half ring 2 can be controlled to move synchronously into the inner ring surface of the annular structure composed of the two fixed half rings 2, and the tube body 1 can be fixed in the axial direction of the inner ring surface of the annular structure composed of the two fixed half rings 2.

[0035] The welding assembly includes a pitch-adjusting rod 7 whose bottom end is arranged on a rotating assembly, a pitch-adjusting piece arranged on the rod body of the pitch-adjusting rod 7, a support rod 8 arranged laterally on one side of the pitch-adjusting rod 7 and connected to the pitch-adjusting piece, a vertical rod 10 arranged in the vertical direction and fixedly connected at the top end to the support rod 8 on the bottom side surface away from the pitch-adjusting piece, and two cross rods 11 symmetrically arranged on both sides of the bottom end of the vertical rod 10. The two cross rods 11 are rotatably connected to rotating blocks 12 at one end away from each other, and the two rotating blocks 12 can respectively fix the welding gun and the welding wire conveying structure.

[0036] A rotating cylinder 9 is rotatably arranged on the body of the support rod 8 , and a cable connected to the welding gun is wound around the body of the rotating cylinder 9 .

[0037] The distance adjusting member includes a distance adjusting block 21 which is movably arranged in a distance adjusting groove 20 opened along the length direction on the side of the distance adjusting rod 7 and is connected to the end of the support rod 8 on the side, and a fixed screw rod 22 whose one end passes through a through groove 19 opened on the side of the distance adjusting rod 7 adjacent to the distance adjusting groove 20 and passes through the distance adjusting block 21 and is threadedly connected to the distance adjusting block 21. A control block 23 is fixedly arranged on the end of the fixed screw rod 22 away from the distance adjusting block 21, and the through groove 19 is opened along the length direction of the distance adjusting rod 7.

[0038] like Figure 1-7 As shown, when welding the position to be welded on the pipe body 1, firstly, two fixed semi-rings 2 are arranged in an annular structure on the pipe body 1, and the motor drives the driving gear 16 to drive the multiple positioning screws 13 penetrating the fixed semi-rings 2 to move synchronously in the axial direction of the annular structure, so that the two fixed semi-rings 2 can be formed into an annular structure and sleeved on the pipe body 1, and ensure that the pipe body 1 is in the axial direction of the annular structure, and then cooperate with the rotating component to drive the welding gun to perform surrounding welding around the position to be welded on the surface of the pipe body 1, and after the welding gun rotates around the surface of the pipe body 1 once, the rotating component drives the pitch rod 7 to move to the starting welding position. Since the position to be welded of the high-pressure container is thick-walled, it is necessary to gradually reduce the depth of the position to be welded and perform layer-by-layer welding. When the pitch rod 7 moves to the starting welding position, the rotating control block 23 drives the fixed wire The rod 22 moves in the direction away from the distance adjusting block 21, and at this time, the support rod 8 and the welding gun arranged on the support rod 8 can be driven to move in the direction away from the pipe body 1, and the thick wall at the welding position to be welded is gradually welded. After the welding gun position is adjusted, the control block 23 is rotated to drive the fixed screw rod 22 to rotate, so that the end of the fixed screw rod 22 is against the groove wall of the distance adjusting groove 20, so that the position of the distance adjusting block 21 in the distance adjusting groove 20 is fixed, and the distance between the welding gun and the welding position to be fixed is fixed. The driving ring 31 is driven by the motor to rotate in the driving groove 30, and the welding gun can be driven to rotate around the surface of the pipe body 1, so that the welding position of the pipe body 1 to be welded is gradually welded, avoiding the situation that the staff is fatigued due to long-term work and welding errors occur, and the high-pressure container can be welded conveniently, thereby improving the welding quality of the high-pressure container.

[0039] The rotating assembly includes a driving ring 31 arranged in a semi-annular driving groove 30 on the end surface of the fixed semi-ring 2, and the bottom side of the pitch adjusting rod 7 is fixedly connected to the driving ring 31 away from the end surface of the fixed semi-ring 2.

[0040] The two fixed half rings 2 form an annular structure, and the two driving grooves 30 also form an annular structure, and racks are arranged on the sides of the two driving rings 31, and the racks are meshed with gears. The gears are driven by a motor. When the two fixed half rings 2 form an annular structure, the gears are driven by the motor to rotate, driving the driving ring 31 to rotate in the driving groove 30, thereby driving the pitch adjusting rod 7 to rotate on the pipe body 1, and driving the welding assembly to weld the position to be welded on the surface of the pipe body 1.

[0041] A sealing block 26 is fixedly arranged at the middle position of the telescopic hole provided on the end face of the rotating semi-ring 4, and two connecting blocks 27 with one end which can be passed through the outside of the telescopic hole are movably arranged at the two opening positions of the telescopic hole. The connecting block 27 and the sealing block 26 are connected by a second telescopic rod 28, and a return spring 29 is movably sleeved on the rod body of the second telescopic rod 28. When the return spring 29 is in a normal elongated state, the two connecting blocks 27 are movably passed through the telescopic hole and are passed through the connecting groove 18 provided on the groove wall of the rotating groove 3, so as to facilitate fixing the position of the rotating semi-ring 4 in the rotating groove 3. Two electromagnets are arranged on the adjacent end faces of the connecting block 27 and the sealing block 26. When the rotating semi-ring 4 is controlled to rotate in the rotating groove 3, the adjacent ends of the two adjacent electromagnets are controlled to have opposite magnetic poles, and the suction force between the two electromagnets drives the connecting block 27, which is passed through one end of the connecting groove 18, to move into the telescopic hole. At this time, the rotating semi-ring 4 rotates in the rotating groove 3 under the action of the driving gear 16.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-pressure container perforated thick-wall forged pipe welding device, comprising two fixing half rings (2) which are rotatably connected at one end and fixedly connected at the other end, a fixing assembly for sleeve-fixing the two fixing half rings (2) on a pipe body (1) to be welded, and a welding assembly which is arranged on the two fixing half rings (2) constituting an annular structure through a rotating assembly and welds the two pipe bodies (1) at the positions to be welded, characterized in that: A fixing block (5) with a clamping groove formed on the end surface is provided on the side surface of the two fixing half rings (2) away from the rotating connection, and when the two fixing half rings (2) are arranged in a ring-shaped structure and sleeved on the pipe body (1), the clamping blocks (6) can be fixed in the clamping grooves of the two fixing blocks (5); The fixing assembly comprises three positioning screw rods (13) which are equidistantly spaced and vertically penetrate the outer ring surface of the fixing half ring (2), a control component which is arranged on the fixing half ring (2) and controls the positioning screw rods (13) to synchronously move into the inner ring surface of the fixing half ring (2), and a buffer component which is arranged on one end of the plurality of positioning screw rods (13) which penetrate into the inner ring surface of the fixing half ring (2).

2. A high pressure vessel hole thick wall forged pipe welding device according to claim 1, characterized in that: The buffer component comprises two buffer blocks (14) arranged in parallel, one of which is fixedly arranged on a positioning screw rod (13) passing through an end face of an inner ring surface of a fixed half ring (2), a first telescopic rod arranged between the two buffer blocks (14) and having two ends respectively connected to adjacent end faces of different buffer blocks (14), and a buffer spring (15) movably sleeved on the rod body of the first telescopic rod and having two ends respectively connected to adjacent end faces of two buffer blocks (14).

3. A high pressure vessel hole thick wall forged pipe welding device according to claim 2, characterized in that: The control member comprises a plurality of driven gears (25) which are arranged in a fixed half ring (2) and are sleeved on a rod body of a positioning screw rod (13) through a threaded connection, and a control structure which is arranged on two fixed half rings (2) and controls the plurality of driven gears (25) to rotate synchronously. A limiting groove (24) is provided on the rod body of the positioning screw rod (13) along its length direction, and a limiting bar which is connected to the fixed half ring (2) is slidably arranged in the limiting groove (24).

4. A high pressure vessel hole thick wall forged pipe welding device according to claim 3, characterized in that: The outer ring surfaces of the two fixed half rings (2) are both provided with a rotation groove (3), and the control structure comprises a rotating half ring (4) slidably arranged in the rotation groove (3), a driven rack (17) fixedly arranged on the side surfaces of both sides of the rotating half ring (4), and a driving gear (16) penetrating through an end surface of one end of the fixed half ring (2) and meshing with one of the driven racks (17), and a driven rack (17) away from the driving gear (16) is meshed with a driven gear (25).

5. A high pressure vessel hole thick wall forged pipe welding device according to claim 4, characterized in that: The welding assembly comprises a pitch-adjusting rod (7) whose bottom end is arranged on a rotating assembly, a pitch-adjusting member arranged on a rod body of the pitch-adjusting rod (7), a support rod (8) arranged transversely on one side of the pitch-adjusting rod (7) and connected to the pitch-adjusting member, a vertical rod (10) arranged in a vertical direction and fixedly connected at the top end to the bottom side surface of one end of the support rod (8) away from the pitch-adjusting member, and two horizontal rods (11) symmetrically arranged at positions on both sides of the bottom end of the vertical rod (10), the two horizontal rods (11) being rotatably connected to rotating blocks (12) at one end away from each other, and the two rotating blocks (12) can respectively fix a welding gun and a welding wire conveying structure.

6. A high pressure vessel hole thick wall forged pipe welding device according to claim 5, characterized in that: A rotating cylinder (9) is rotatably arranged on the body of the support rod (8), and a cable connected to a welding gun is wound around the body of the rotating cylinder (9).

7. A high pressure vessel hole thick wall forged pipe welding device according to claim 6, characterized in that: The distance adjusting member comprises a distance adjusting block (21) movably arranged in a distance adjusting groove (20) provided in the side of the distance adjusting rod (7) along the length direction and connected to the end of the support rod (8) on the side, and a fixed screw rod (22) having one end passing through a through groove (19) provided in the side of the distance adjusting rod (7) adjacent to the distance adjusting groove (20) and passing through the distance adjusting block (21) and being threadedly connected to the distance adjusting block (21); a control block (23) is fixedly arranged on the end of the fixed screw rod (22) away from the distance adjusting block (21); and the through groove (19) is provided in the length direction along the length direction of the distance adjusting rod (7).

8. A high pressure vessel hole thick wall forged pipe welding device according to claim 7, characterized in that: The rotating assembly comprises a driving ring (31) arranged in a driving groove (30) with a semi-annular structure provided on the end surface of a rotating fixed semi-ring (2); the bottom side surface of the pitch adjusting rod (7) is fixedly connected to the driving ring (31) away from one end surface of the fixed semi-ring (2).

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