Large pressure vessel assembling and welding process

Abstract

The invention discloses an assembling and welding process for a large pressure container, and relates to the technical field of container assembling and welding. The method comprises the following steps: step 1, carrying out cutting and rust removal treatment on a to-be-processed large pressure vessel raw material; secondly, the two sections of raw materials obtained after cutting and rust removing are welded through an assembling and welding device; through cooperative use of the butt joint mechanism and the clamping and conveying mechanism, convenience is provided for gathering movement and diffusion movement of the three adjacent clamping and conveying rotating rollers, so that to-be-machined large pressure vessel raw materials with different outer diameter sizes can be stably clamped, convenience is provided for opposite movement and back-to-back movement of two butt joint frames, and the machining efficiency is improved. Accordingly, convenience is provided for accurate and stable butt joint of the two to-be-machined large pressure vessel raw materials, the requirements for accurate and stable clamping and butt joint machining of the to-be-machined large pressure vessel raw materials with different outer diameter sizes can be met, and then the practicability, functionality and operation convenience of the assembling and welding device are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of container assembly welding, in particular to an assembly welding process for a large pressure container. Background Art

[0002] A pressure vessel refers to a closed device that contains gas or liquid and bears a certain pressure. Different regulations are made for the design, manufacturing process, and inspection items, content and methods for each type of pressure vessel. Large pressure vessels require the use of assembly welding equipment for assembly and welding during production and processing.

[0003] However, most of the existing large-scale pressure vessel assembly welding devices cannot meet the needs of processing large-scale pressure vessel raw materials with different outer diameters when in use, and cannot achieve synchronous welding processing on the inside and outside of the seam. The practicality, functionality and ease of operation are all poor, and the welding efficiency is low. In addition, the existing large-scale pressure vessel assembly welding devices are prone to the phenomenon of large-scale pressure vessel raw materials falling and being damaged when in use.

[0004] In view of the above problems, the inventors proposed a large pressure vessel assembly welding process to solve the above problems. Summary of the invention

[0005] In order to solve the problems that the existing large pressure vessel assembly welding device cannot meet the processing requirements of large pressure vessel raw materials with different outer diameters, cannot achieve synchronous welding processing of the inside and outside of the joint, and is prone to falling damage of the large pressure vessel raw materials; the purpose of the present invention is to provide a large pressure vessel assembly welding process.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: A large pressure vessel assembly welding process comprises the following steps:

[0007] Step 1: Cut and remove rust from the large pressure vessel raw material to be processed;

[0008] Step 2: Using an assembly welding device to weld the two sections of raw materials after cutting and rust removal;

[0009] Step 3: Conduct quality inspection on large pressure vessels after welding.

[0010] An assembly welding device for a large pressure vessel assembly welding process comprises a docking mechanism, a clamping mechanism for use with the docking mechanism is provided on the inner side of the docking mechanism, and a welding mechanism for use with the clamping mechanism is provided at one end of the docking mechanism, and a material receiving mechanism for use with the clamping mechanism is provided at the inner bottom end of the docking mechanism. The coordinated use of the docking mechanism and the clamping mechanism can meet the needs of accurate and stable clamping and docking processing of large pressure vessel raw materials with different outer diameters to be processed, the coordinated use of the welding mechanism and the clamping mechanism can perform synchronous welding processing on the inside and outside of the corresponding docking seams, and the setting and use of the material receiving mechanism can effectively avoid the phenomenon of falling damage of the large pressure vessel raw materials to be processed.

[0011] The U-shaped top plate is fixedly mounted on the inner sides of the top ends of the two mounting support rods, a first motor is fixedly mounted on one side of the U-shaped top plate, and a stud is fixedly mounted on the end of the output end of the first motor, the stud is rotatably inserted on the U-shaped top plate, and a symmetrically distributed docking frame is threadedly sleeved on the stud, the docking frame is slidably connected to the U-shaped top plate, the U-shaped top plate is penetrated by symmetrically arranged fixed through holes, and a first guide rod is fixedly inserted in the fixed through holes, a first guide hole is penetrated by the upper end of the docking frame, and the first guide rod is slidably inserted in the first guide hole, the clamping mechanism comprises a transfer screw rod, the transfer screw rod is rotatably inserted on the docking frame, and the transfer screw rods are distributed in an array, the end of the transfer screw rod is fixedly sleeved with a first bevel gear, the opposite ends of the docking frame are rotatably sleeved with a connecting side gear, and the connecting side gear meshes with the first bevel gear, and the end of the docking frame close to the U-shaped top plate is fixedly mounted with a second The first gear is connected with the transmission gear of the first end through the L-shaped spline, and the second gear is connected with the transmission gear of the first end through the L-shaped spline.

[0012] Preferably, the welding mechanism includes a first ring, which is fixedly sleeved on one end of the mounting support rod close to the first motor, and an L-shaped side rod is fixedly connected to the first ring, a second ring is fixedly installed between the two L-shaped side rods, and the first electric telescopic rod is fixedly inserted in the second ring, the end of the output end of the first electric telescopic rod is fixedly connected to a third ring, and a U-shaped feeding rod is fixedly inserted in the third ring, a symmetrically arranged fourth ring is fixedly installed at the end of the U-shaped feeding rod, and the second electric telescopic rod is fixedly inserted in the fourth ring, the end of the output end of the second electric telescopic rod is fixedly connected to a mounting base, and the welding machine body is fixedly inserted in the mounting base.

[0013] Preferably, the material receiving mechanism includes a material receiving base plate, which is fixedly sleeved on two mounting support rods, and an array of sliding guide holes are opened through the material receiving base plate, a sliding guide rod is slidably inserted in the sliding guide hole, and a U-shaped material receiving frame is fixedly installed on the top of the sliding guide rod, a return spring is movably sleeved on the outer side of the sliding guide rod, and two ends of the return spring are respectively fixedly connected to the material receiving base plate and the U-shaped material receiving frame, and a rubber base pad for use in conjunction is fixedly installed on the inner side of the U-shaped material receiving frame.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The coordinated use of the docking mechanism and the clamping mechanism facilitates the gathering and diffusion movements of the three adjacent clamping rollers, so that the large pressure vessel raw materials with different outer diameters to be processed can be stably clamped, and the two docking frames are convenient for the movement toward and away from each other, thereby facilitating the precise and stable docking of the two large pressure vessel raw materials to be processed, thereby meeting the requirements for precise and stable clamping and docking processing of large pressure vessel raw materials with different outer diameters to be processed, thereby effectively improving the practicality, functionality and ease of operation of the assembly welding device;

[0016] 2. The cooperation of the welding mechanism and the clamping mechanism facilitates the horizontal and vertical movement of the two welding machine bodies, so that the two welding machine bodies can be conveniently moved to the corresponding positions of the butt joints of large pressure vessel raw materials to be processed of different sizes and the two welding machine bodies can be respectively in contact with the inner and outer walls of the butt joints. In addition, when the two welding machine bodies are in operation, the corresponding two large pressure vessel raw materials to be processed can be synchronously driven to rotate, so that the corresponding butt joints can be synchronously welded inside and outside, thereby further improving the practicality, functionality and convenience of operation of the assembly welding device, and effectively improving the welding efficiency of the assembly welding device;

[0017] 3. Through the setting and use of the material receiving mechanism, the rubber bottom pad can provide preliminary buffering protection for the falling large-scale pressure vessel raw materials to be processed when they fall, and then the falling large-scale pressure vessel raw materials to be processed can drive the U-shaped material receiving frame to move downward, thereby squeezing the reset spring, and then the elastic force of the reset spring can be used to provide secondary buffering protection for the falling large-scale pressure vessel raw materials to be processed, thereby effectively avoiding the falling damage of the large-scale pressure vessel raw materials to be processed, and then effectively reducing the economic losses caused by the assembly and welding of large-scale pressure vessel raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the installation of the material receiving mechanism in the present invention.

[0021] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure in the middle.

[0022] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B in the middle.

[0023] Figure 5 For the present invention Figure 2 Enlarged schematic diagram of the structure at point C in the middle.

[0024] Figure 6 For the present invention Figure 2 Enlarged schematic diagram of the structure at point D in the middle.

[0025] Figure 7 For the present invention Figure 2 Enlarged schematic diagram of the structure at point E in the middle.

[0026] Figure 8 For the present invention Figure 2 Enlarged schematic diagram of the structure at F in the middle.

[0027] In the figure: 1, docking mechanism; 11, mounting support rod; 12, U-shaped top plate; 13, first motor; 14, stud; 15, docking frame; 16, fixed through hole; 17, first guide rod; 18, first guide hole; 2, clamping mechanism; 21, transfer screw rod; 22, first bevel gear; 23, connecting side gear; 24, second motor; 25, L-shaped clamping plate; 26, clamping rotating rod; 27, clamping rotating roller; 28, second bevel gear; 29, third motor; 210, third bevel gear; 211, first bracket; 212, fixed Through hole; 213, second guide rod; 214, second guide hole; 215, second bracket; 3, welding mechanism; 31, first ring; 32, L-shaped side rod; 33, second ring; 34, first electric telescopic rod; 35, third ring; 36, U-shaped feeding rod; 37, fourth ring; 38, second electric telescopic rod; 39, mounting base; 310, welding machine body; 4, material receiving mechanism; 41, material receiving bottom plate; 42, sliding guide hole; 43, sliding guide rod; 44, U-shaped material receiving frame; 45, reset spring; 46, rubber base pad. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example: Figure 1-Figure 8 As shown, the present invention provides a large pressure vessel assembly welding process, comprising the following steps:

[0030] Step 1: Cut and remove rust from the large pressure vessel raw material to be processed;

[0031] Step 2: Using an assembly welding device to weld the two sections of raw materials after cutting and rust removal;

[0032] Step 3: Conduct quality inspection on large pressure vessels after welding.

[0033] An assembly welding device for a large pressure vessel assembly welding process comprises a docking mechanism 1, a clamping mechanism 2 is provided on the inner side of the docking mechanism 1 for use with it, and a welding mechanism 3 is provided on one end of the docking mechanism 1 for use with the clamping mechanism 2, and a material receiving mechanism 4 is provided on the inner bottom end of the docking mechanism 1 for use with the clamping mechanism 2. The coordinated use of the docking mechanism 1 and the clamping mechanism 2 can meet the needs of accurate and stable clamping and docking processing of large pressure vessel raw materials with different outer diameters to be processed, the coordinated use of the welding mechanism 3 and the clamping mechanism 2 can perform synchronous welding processing on the inside and outside of the corresponding butt joints, and the setting and use of the material receiving mechanism 4 can effectively avoid the phenomenon of falling damage of the large pressure vessel raw materials to be processed.

[0034] The docking mechanism 1 includes a mounting support rod 11, and a U-shaped top plate 12 for use is fixedly installed on the inner side of the top ends of the two mounting support rods 11. A first motor 13 is fixedly installed on one side of the U-shaped top plate 12, and a stud 14 is fixedly installed on the end of the output end of the first motor 13. The stud 14 is rotatably inserted on the U-shaped top plate 12, and a symmetrically distributed docking frame 15 is threadedly sleeved on the stud 14. The docking frame 15 is slidably connected to the U-shaped top plate 12. A symmetrically arranged fixed through hole 16 is penetrated on the U-shaped top plate 12, and a first guide rod 17 is fixedly inserted in the fixed through hole 16. The setting and use of the fixed through hole 16 provides a guarantee for the stable insertion of the first guide rod 17. The upper end of the docking frame 15 is penetrated by a first guide hole 18, and the first guide rod 17 is slidably inserted in the first guide hole 18, and the cooperation of the first guide rod 17 and the first guide hole 18 plays a role in limiting and guiding the movement and adjustment of the docking frame 15. The clamping mechanism 2 includes a transfer screw rod 21, which is rotatably inserted on the docking frame 15, and the transfer screw rod 21 is distributed in an array, and the end of the transfer screw rod 21 is fixedly sleeved with a first bevel gear 22, and the opposite ends of the docking frame 15 are rotatably sleeved with a connecting side gear 23, and the connecting side gear 23 is meshed with the first bevel gear 22. A second motor 24 is fixedly installed at one end of the docking frame 15 close to the U-shaped top plate 12, and the end of the output end of the second motor 24 is fixedly connected to the transfer screw rod 21 close to the U-shaped top plate 12, and the docking frame 1 A first bracket 211 is fixedly installed on one side close to the U-shaped top plate 12, and the second motor 24 is fixedly inserted in the first bracket 211. The setting and use of the first bracket 211 provides a guarantee for the stable installation of the second motor 24. An L-shaped clamping plate 25 is threadedly sleeved on the transfer screw 21, and the L-shaped clamping plate 25 is slidably connected to the docking frame 15. Three fixed through holes 212 are penetrated on the docking frame 15, and a second guide rod 213 is fixedly inserted in the fixed through hole 212. The setting and use of the fixed through hole 212 provides a guarantee for the stable insertion of the second guide rod 213. A second guide hole 214 is penetrated on the L-shaped clamping plate 25, and the second guide rod 213 is slidably inserted in the second guide hole 214. The second guide rod 213 and the second guide hole 214 are connected. The coordinated use of 14 plays a limiting and guiding role in the movement and adjustment of the L-shaped clamping plate 25. The end of the L-shaped clamping plate 25 is rotatably inserted with a clamping and feeding rotating rod 26, and the clamping and feeding rotating rod 26 is fixedly sleeved with a clamping and feeding rotating roller 27. One end of the clamping and feeding rotating rod 26 is fixedly sleeved with a second bevel gear 28, and a third motor 29 is fixedly installed on the side of the L-shaped clamping plate 25 close to the second bevel gear 28. A second bracket 215 is fixedly installed on one side of the L-shaped clamping plate 25, and the third motor 29 is fixedly inserted in the second bracket 215. The setting and use of the second bracket 215 provides a guarantee for the stable insertion of the third motor 29. The end of the output end of the third motor 29 is fixedly sleeved with a third bevel gear 210, and the third bevel gear 210 is meshed with the second bevel gear 28.

[0035] By adopting the above technical solution, when in use, two large pressure vessel raw materials to be processed are placed into two docking frames 15 in turn and the corresponding second motors 24 are started in turn, so that the corresponding transfer screw 21 can be driven to rotate, and then the corresponding first bevel gear 22 can be driven to rotate, and further the corresponding connecting side gear 23 can be used to drive the corresponding other two first bevel gears 22 to rotate, so that the corresponding other two transfer screws 21 can be driven to rotate, and then the corresponding three L-shaped clamping plates 25 can be driven to gather toward the middle synchronously, and further the corresponding three pinching rollers 27 can be driven to gather toward the middle synchronously, until the corresponding three pinching rollers 27 are in close contact with the outer wall of the corresponding large pressure vessel raw material to be processed, and then the corresponding second motor 24 is paused, Then, the first motor 13 is started, thereby driving the stud 14 to rotate, thereby driving the two docking frames 15 to move toward each other, and further driving the two large pressure vessel materials to be processed to move toward each other, and the first motor 13 is paused when the opposite ends of the two large pressure vessel materials to be processed are docked, and during the welding operation, the third motor 29 will drive the corresponding third bevel gear 210 to rotate, thereby driving the corresponding clamping and feeding rotating rod 26 to rotate through the corresponding second bevel gear 28, and then driving the corresponding clamping and feeding rotating roller 27 to rotate, and further cooperating with the corresponding other two clamping and feeding rotating rods 26 to drive the corresponding other two clamping and feeding rotating rollers 27 to rotate, so that the two large pressure vessel materials to be processed can rotate synchronously.

[0036] The welding mechanism 3 includes a first ring 31, which is fixedly sleeved on one end of the mounting support rod 11 close to the first motor 13, and an L-shaped side rod 32 is fixedly connected to the first ring 31, a second ring 33 is fixedly installed between the two L-shaped side rods 32, and a first electric telescopic rod 34 is fixedly inserted in the second ring 33, a third ring 35 is fixedly connected to the end of the output end of the first electric telescopic rod 34, and a U-shaped feeding rod 36 is fixedly inserted in the third ring 35, a symmetrically arranged fourth ring 37 is fixedly installed at the end of the U-shaped feeding rod 36, and a second electric telescopic rod 38 is fixedly inserted in the fourth ring 37, a mounting base 39 is fixedly connected to the end of the output end of the second electric telescopic rod 38, and a welding machine body 310 is fixedly inserted in the mounting base 39, and the welding machine body 310 can perform welding processing on large pressure vessel raw materials, which is a prior art and will not be described in detail here.

[0037] By adopting the above technical solution, when in use, the first electric telescopic rod 34 is started, so that the third ring 35 can be driven to move to the side away from the second ring 33, and then the U-shaped feeding rod 36 can be driven to move to the side away from the second ring 33, and further the second electric telescopic rod 38 and the corresponding welding machine body 310 can be driven to move to the side away from the second ring 33 through the fourth ring 37, and the first electric telescopic rod 34 is closed when the welding machine body 310 moves to the corresponding joint, and then the two second electric telescopic rods 38 will be started synchronously, so that the two mounting bases 39 can be driven to move toward each other, and then the two welding machine bodies 310 can be driven to move toward each other, and the corresponding second electric telescopic rods 38 are closed when the two welding machine bodies 310 are respectively in contact with the inner and outer walls of the joint.

[0038] The material receiving mechanism 4 includes a material receiving base plate 41, which is fixedly sleeved on the two mounting support rods 11, and an array of sliding guide holes 42 are opened through the material receiving base plate 41, a sliding guide rod 43 is slidably inserted in the sliding guide hole 42, and a U-shaped material receiving frame 44 is fixedly installed on the top of the sliding guide rod 43, a return spring 45 is movably sleeved on the outer side of the sliding guide rod 43, and the two ends of the return spring 45 are respectively fixedly connected to the material receiving base plate 41 and the U-shaped material receiving frame 44, and a rubber base pad 46 for use with the material receiving frame is fixedly installed on the inner side of the U-shaped material receiving frame 44.

[0039] By adopting the above technical scheme, when in use, if the large-scale pressure vessel raw material to be processed falls, the rubber bottom pad 46 can provide preliminary buffering protection for the fallen large-scale pressure vessel raw material to be processed, and then the fallen large-scale pressure vessel raw material to be processed can drive the U-shaped material receiving frame 44 to move downward, thereby squeezing the reset spring 45, and then the elastic force of the reset spring 45 can be used to provide secondary buffering protection for the fallen large-scale pressure vessel raw material to be processed, thereby effectively avoiding the falling damage of the large-scale pressure vessel raw material to be processed, and then effectively reducing the economic losses caused by the assembly and welding of large-scale pressure vessel raw materials.

[0040] Working principle: When in use, two large pressure vessel raw materials to be processed are placed into two docking frames 15 in turn and the corresponding second motors 24 are started in turn, so as to drive the corresponding transfer screw 21 to rotate, and then drive the corresponding first bevel gear 22 to rotate, and further drive the corresponding other two first bevel gears 22 to rotate through the corresponding connecting side gear 23, so as to drive the corresponding other two transfer screws 21 to rotate, and then drive the corresponding three L-shaped clamping plates 25 to gather toward the middle synchronously, and further drive the corresponding three pinching rollers 27 to gather toward the middle synchronously, until the corresponding three pinching rollers 27 are in close contact with the outer wall of the corresponding large pressure vessel raw materials to be processed, and then the corresponding second motor 24 is paused, and then the first motor 13 is started, so as to drive the stud 14 to rotate, and then the two docking frames 15 to move toward each other, and further drive the two large pressure vessel raw materials to be processed to move toward each other, and the first motor 13 is paused when the opposite ends of the two large pressure vessel raw materials to be processed are docked;

[0041] Then, the first electric telescopic rod 34 is started, so that the third ring 35 can be driven to move to the side away from the second ring 33, and then the U-shaped feeding rod 36 can be driven to move to the side away from the second ring 33, and further the second electric telescopic rod 38 and the corresponding welding machine body 310 can be driven to move to the side away from the second ring 33 through the fourth ring 37, and the first electric telescopic rod 34 is closed when the welding machine body 310 moves to the side corresponding to the butt joint, and then the two second electric telescopic rods 38 are started synchronously, so that the two mounting bases 39 can be driven to move toward each other, and then the two welding machine bodies 310 can be driven to move toward each other, and the corresponding second electric telescopic rods 38 are closed when the two welding machine bodies 310 are in contact with the inner and outer walls of the butt joint respectively;

[0042] Then, the two third motors 29 and the two welding machine bodies 310 are started. At this time, the third motor 29 will drive the corresponding third bevel gear 210 to rotate, thereby driving the corresponding pinching and feeding rotating rod 26 to rotate through the corresponding second bevel gear 28, and then driving the corresponding pinching and feeding rotating roller 27 to rotate, and further cooperating with the corresponding other two pinching and feeding rotating rods 26 to drive the corresponding other two pinching and feeding rotating rollers 27 to rotate, so that the two large pressure vessel raw materials to be processed can rotate synchronously. At the same time, the two welding machine bodies 310 can perform synchronous welding processing on the inside and outside of the joints;

[0043] During this period, if the large-scale pressure vessel raw material to be processed falls, the rubber bottom pad 46 can provide initial buffering protection for the falling large-scale pressure vessel raw material to be processed, and then the falling large-scale pressure vessel raw material to be processed can drive the U-shaped material receiving frame 44 to move downward, thereby squeezing the reset spring 45, and then the elastic force of the reset spring 45 can be used to provide secondary buffering protection for the falling large-scale pressure vessel raw material to be processed, thereby effectively avoiding the falling damage of the large-scale pressure vessel raw material to be processed, and then effectively reducing the economic losses caused by the assembly and welding of large-scale pressure vessel raw materials.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A large pressure vessel assembly welding process, characterized in that: The steps include: Step 1: Cut and remove rust from the large pressure vessel raw material to be processed; Step 2: Using an assembly welding device to weld the two sections of raw materials after cutting and rust removal; Step 3: Conduct quality inspection on large pressure vessels after welding.

2. An assembly welding device for a large pressure vessel assembly welding process, characterized in that: A large pressure vessel assembly welding process as described in claim 1 comprises a docking mechanism (1), the inner side of the docking mechanism (1) is provided with a clamping mechanism (2) for use with it, and one end of the docking mechanism (1) is provided with a welding mechanism (3) for use with the clamping mechanism (2), and the inner bottom end of the docking mechanism (1) is provided with a material receiving mechanism (4) for use with the clamping mechanism (2). The coordinated use of the docking mechanism (1) and the clamping mechanism (2) can meet the requirements of accurate and stable clamping and docking processing of large pressure vessel raw materials with different outer diameters to be processed, the coordinated use of the welding mechanism (3) and the clamping mechanism (2) can perform synchronous welding processing on the inside and outside of the corresponding docking seams, and the setting and use of the material receiving mechanism (4) can effectively avoid the large pressure vessel raw materials to be processed from falling.

3. The assembly welding device for large pressure vessel assembly welding process according to claim 2, characterized in that: The docking mechanism (1) comprises a mounting support rod (11), a U-shaped top plate (12) for use with the mounting support rods (11) being fixedly mounted on the inner sides of the top ends of the two mounting support rods (11), a first motor (13) being fixedly mounted on one side of the U-shaped top plate (12), and a stud bolt (14) being fixedly mounted on the end of the output end of the first motor (13), the stud bolt (14) being rotatably inserted on the U-shaped top plate (12), and a symmetrically distributed docking frame (15) being threadedly sleeved on the stud bolt (14), and the docking frame (15) being slidably connected to the U-shaped top plate (12).

4. The assembly welding device for large pressure vessel assembly welding process as claimed in claim 3, characterized in that: The U-shaped top plate (12) is provided with symmetrically arranged fixing through holes (16), and a first guide rod (17) is fixedly inserted in the fixing through holes (16); the upper end of the docking frame (15) is provided with a first guide hole (18), and the first guide rod (17) is slidably inserted in the first guide hole (18).

5. The assembly welding device for large pressure vessel assembly welding process as claimed in claim 3, characterized in that: The clamping mechanism (2) comprises a conveying screw (21), the conveying screw (21) is rotatably inserted on the docking frame (15), and the conveying screws (21) are distributed in an array, the end of the conveying screw (21) is fixedly sleeved with a first bevel gear (22), the opposite ends of the docking frame (15) are rotatably sleeved with a connecting side gear (23), and the connecting side gear (23) is meshed with the first bevel gear (22), and a second motor (24) is fixedly installed at one end of the docking frame (15) close to the U-shaped top plate (12), and the end of the output end of the second motor (24) is fixedly connected to the conveying screw (21) close to the U-shaped top plate (12). An L-shaped clamping plate (25) is threadedly sleeved on the transfer screw rod (21), and the L-shaped clamping plate (25) is slidably connected to the docking frame (15); a clamping and feeding rotating rod (26) is rotatably inserted at the end of the L-shaped clamping plate (25), and a clamping and feeding rotating roller (27) is fixedly sleeved on the clamping and feeding rotating rod (26); a second bevel gear (28) is fixedly sleeved on one end of the clamping and feeding rotating rod (26), and a third motor (29) is fixedly installed on a side of the L-shaped clamping plate (25) close to the second bevel gear (28); a third bevel gear (210) is fixedly sleeved on the end of the output end of the third motor (29), and the third bevel gear (210) is meshed with the second bevel gear (28).

6. The assembly welding device for large pressure vessel assembly welding process according to claim 5, characterized in that: A first bracket (211) is fixedly mounted on one side of the docking frame (15) close to the U-shaped top plate (12), and the second motor (24) is fixedly inserted in the first bracket (211).

7. The assembly welding device for large pressure vessel assembly welding process according to claim 5, characterized in that: The docking frame (15) is provided with three fixing through holes (212), and a second guide rod (213) is fixedly inserted in the fixing through holes (212); the L-shaped clamping plate (25) is provided with a second guide hole (214), and the second guide rod (213) is slidably inserted in the second guide hole (214).

8. The assembly welding device for large pressure vessel assembly welding process as claimed in claim 5, characterized in that: A second bracket (215) is fixedly mounted on one side of the L-shaped clamping plate (25), and a third motor (29) is fixedly inserted in the second bracket (215).

9. The assembly welding device for large pressure vessel assembly welding process as claimed in claim 3, characterized in that: The welding mechanism (3) comprises a first sleeve ring (31), the first sleeve ring (31) being fixedly sleeved on one end of the mounting support rod (11) close to the first motor (13), and the first sleeve ring (31) being fixedly connected to an L-shaped side rod (32), a second sleeve ring (33) being fixedly mounted between the two L-shaped side rods (32), and a first electric telescopic rod (34) being fixedly plugged into the second sleeve ring (33), a third sleeve ring (35) being fixedly connected to the end of the output end of the first electric telescopic rod (34), and a U-shaped feeding rod (36) being fixedly plugged into the third sleeve ring (35), a symmetrically arranged fourth sleeve ring (37) being fixedly mounted on the end of the U-shaped feeding rod (36), and a second electric telescopic rod (38) being fixedly plugged into the fourth sleeve ring (37), and a mounting base (39) being fixedly connected to the end of the output end of the second electric telescopic rod (38), and a welding machine body (310) being fixedly plugged into the mounting base (39).

10. The assembly welding device for large pressure vessel assembly welding process according to claim 3, characterized in that: The material receiving mechanism (4) comprises a material receiving base plate (41), the material receiving base plate (41) is fixedly sleeved on two mounting support rods (11), and an array of sliding guide holes (42) are penetrated through the material receiving base plate (41), a sliding guide rod (43) is slidably inserted in the sliding guide hole (42), and a U-shaped material receiving frame (44) is fixedly installed on the top of the sliding guide rod (43), a return spring (45) is movably sleeved on the outer side of the sliding guide rod (43), and the two ends of the return spring (45) are respectively fixedly connected to the material receiving base plate (41) and the U-shaped material receiving frame (44), and a rubber base pad (46) for use with the material receiving frame (44) is fixedly installed on the inner side of the U-shaped material receiving frame (44).

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