Girth welding device for pressure vessel production

Abstract

The invention relates to the technical field of pressure vessel welding, in particular to a girth welding device for pressure vessel production, which comprises a basic unit fixed on the ground, the basic unit is further provided with a polishing unit matched with a welding unit, and the polishing unit comprises a mounting table, a polishing assembly and a reciprocating driving mechanism. The reciprocating driving mechanism is fixed to the basic unit and provided with a plurality of driving ends, the driving ends are matched with the mounting table so as to drive the mounting table to move in a reciprocating mode, and the grinding assembly is fixed to the mounting table. The polishing unit is arranged on the basic unit, the polishing assembly can polish a welding seam and the periphery of the welding seam before welding so as to remove oxides and impurities on the surface of the pressure container, polishing is conducted again after welding, and the welding quality is improved; the situation that a welding seam is wide can be handled, grinding work is more thorough, and the welding quality is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of pressure vessel welding, and in particular to a girth welding device for pressure vessel production. Background Art

[0002] The automatic welding equipment for the circumferential seam of pressure vessels generally consists of a roller frame and a welder. Before welding, the two cylindrical components to be welded are lifted onto the roller frame using a lifting device, and the welding surfaces of the two are fully in contact. The roller frame can then drive the two components to rotate synchronously in the same direction. During the rotation process, the welder welds the weld formed by the splicing. After welding is completed, the pressure vessel is output by the lifting equipment.

[0003] After circumferential welding is completed, post-processing is required, such as grinding the weld to improve weld quality and enhance weld fatigue strength. In related technologies, weld grinding is often performed manually or by machine after the pressure vessel is moved to another workstation after welding. Due to the large size and mass of the pressure vessel itself, unnecessary lifting work increases the risk level during the entire operation.

[0004] In addition, for larger pressure vessels, the welds are wider, and when ordinary grinding wheels are used for grinding, there is often a problem of incomplete grinding, which affects the quality of the workpiece after welding. Summary of the Invention

[0005] In order to simplify the welding operation process, improve the operation efficiency and the work quality after welding, the present application provides a girth welding device for pressure vessel production.

[0006] The present application provides a girth welding device for pressure vessel production that adopts the following technical solution: A girth welding device for pressure vessel production is used for welding the circular cross-sections of two cylindrical pressure vessel components. The device comprises a base unit fixed to the ground, a welding unit and a transmission support unit provided on the base unit, the welding unit being located on one side of the transmission support unit, and the two cylindrical pressure vessel components being placed on the transmission support unit for welding. The base unit is also provided with a grinding unit that cooperates with the welding unit. The grinding unit includes a mounting table, a grinding assembly and a reciprocating drive mechanism. The reciprocating drive mechanism is fixed on the base unit and has multiple driving ends. The multiple driving ends cooperate with the mounting table to drive the mounting table to move back and forth. The grinding assembly is fixed on the mounting table.

[0007] Optionally, the reciprocating drive mechanism includes two groups of relatively distributed reciprocating displacement components, and two half gears are respectively installed on the two groups of reciprocating displacement components. Each group of reciprocating displacement components can drive the two half gears cooperating therewith to rotate synchronously in opposite directions. A rack is provided on the side of the mounting platform facing the reciprocating drive mechanism, and the rack cooperates with each half gear.

[0008] Optionally, each group of the reciprocating displacement components includes two relatively distributed driven bevel gears, a driving bevel gear arranged between the two driven bevel gears and meshing with both of them, and two transmission shafts respectively connected to the two driven bevel gears, the two half gears are respectively installed on the two transmission shafts, and the reciprocating drive mechanism also includes a driving component that simultaneously drives the driving bevel gears of the two groups of reciprocating displacement components to rotate in the same direction.

[0009] Optionally, the mounting platform includes a horizontal portion slidably arranged on the base unit, and a vertical portion arranged on one side of the horizontal portion and rotatably connected to the horizontal portion, a drive is arranged between the horizontal portion and the vertical portion to drive the vertical portion to rotate relative to the horizontal portion in a vertical plane, and the grinding assembly is arranged at one end of the vertical portion away from the horizontal portion.

[0010] Optionally, the transmission support unit includes a rotating transmission mechanism and a positioning support mechanism. The rotating transmission mechanism is arranged at the end of the basic unit to provide support for the ends of the two cylindrical pressure vessel components and drive them to rotate. The positioning support mechanism is arranged in the middle of the basic unit to provide support for the middle of the two cylindrical pressure vessel components and perform fine-tuning to make the welding surfaces of the two flush.

[0011] Optionally, the transmission support unit includes a rotating transmission mechanism and a positioning support mechanism. The rotating transmission mechanism is arranged at the end of the basic unit to provide support for the ends of the two cylindrical pressure vessel components and drive them to rotate. The positioning support mechanism is arranged in the middle of the basic unit to provide support for the middle of the two cylindrical pressure vessel components and perform fine-tuning to make the welding surfaces of the two flush.

[0012] Optionally, the transmission support unit further includes an auxiliary support mechanism, which is arranged between the rotation transmission mechanism and the positioning support mechanism. The auxiliary support mechanism includes two groups of relatively arranged auxiliary support components and a damper arranged between the two groups of auxiliary support components.

[0013] Optionally, each group of the auxiliary support components includes an auxiliary support roller and two rotating arms, the two rotating arms are parallel to each other and the bottom ends are rotatably connected to the basic unit, and the top ends extend toward the outside of the basic unit, and the auxiliary support rollers are rotatably installed on the top ends of the two rotating arms.

[0014] Optionally, the basic unit includes a fixed base and a movable base, and a power assembly arranged between the fixed base and the movable base, the power assembly is used to drive the movable base closer to or away from the fixed base, and the transmission support unit is provided in two groups, and the two groups of transmission support units are relatively distributed and respectively arranged on the fixed base and the movable base.

[0015] In summary, this application includes at least one of the following beneficial technical effects: By setting a grinding unit on the basic unit, the grinding assembly can grind the weld and its surroundings before welding to remove oxides and impurities on the surface of the pressure vessel, and grind again after welding to improve the welding quality. The reciprocating drive mechanism of the grinding unit can drive the grinding assembly to move back and forth to handle the situation of wider welds, making the grinding work more thorough and further improving the welding quality. By setting up the positioning support mechanism, when the two pressure vessel components to be welded are placed on it, the mounting frame and the support roller are driven by the jack to rotate in the vertical plane, and the position of the two ends close to each other can be fine-tuned to ensure that the welding surfaces of the two components are flush, further improving the welding quality; When the two components are hoisted onto the welding equipment, the auxiliary support mechanism first contacts the components and is subjected to pressure from them. This causes the damper to elastically deform, increasing the angle between the two sets of auxiliary support assemblies. The two components then press downward and ultimately make full contact with the rotary transmission mechanism and the positioning support mechanism. The three mechanisms work together to provide excellent support for the components. Furthermore, the auxiliary support mechanism also shares the pressure on the rotary transmission mechanism, preventing excessive pressure from affecting transmission and reducing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic side view cross-sectional structure diagram of the main body of the embodiment of the present application.

[0017] Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0018] Figure 3 This is a schematic structural diagram of the positioning support mechanism according to an embodiment of the present application; Figure 4 It is a structural diagram of the transmission mechanism of an embodiment of the present application; Figure 5 This is a schematic structural diagram of the auxiliary support mechanism according to an embodiment of the present application; Figure 6 2 is a schematic side cross-sectional structural diagram of a grinding unit according to an embodiment of the present application; Figure 7 It is a schematic diagram of the front cross-sectional structure of the grinding unit of the embodiment of the present application.

[0019] Reference numerals: 01, base unit; 02, welding unit; 03, transmission support unit; 04, grinding unit; 1. Fixed base; 2. Movable base; 3. Power assembly; 4. Transmission components; 5. Positioning support assembly; 51. Fixed seat; 52. Jack; 53. Mounting frame; 54. Support roller; 6. Auxiliary support assembly; 61. Auxiliary support roller; 62. Rotating arm; 7. Damper; 8. Mounting table; 81. Horizontal portion; 82. Vertical portion; 83. Driver; 9. Grinding assembly; 10. Reciprocating displacement assembly; 101. Driven bevel gear; 102. Driving bevel gear; 103. Transmission shaft; 11. Half gear; 12. Drive assembly; 13. Rack. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-7 This application is described in further detail.

[0021] The embodiment of the present application discloses a girth welding device for pressure vessel production. Figure 1 A girth welding device for pressure vessel production includes a base unit 01, a transmission support unit 03, a grinding unit 04, and a welding unit 02. The transmission support unit 03, grinding unit 04, and welding unit 02 are all mounted on the base unit 01. The transmission support unit 03 provides support and transmission for the two pressure vessel components to be welded, enabling them to rotate synchronously and in the same direction during the welding process. This, in conjunction with the welding unit 02, automatically completes the girth welding process. The grinding unit 04 can polish the weld before and after welding, thereby improving weld quality.

[0022] Reference Figure 1 The base unit 01 is a rectangular frame structure with an upward, horizontal base surface, upon which each of the aforementioned units is mounted. When the two components are placed on the transmission support unit 03, their axes are parallel to the long sides of the rectangular frame structure of the base unit 01. The two components contact each other, forming a circular weld located within a vertical plane. The welding unit 02 can be specifically positioned on one side of the transmission support unit 03, with the welding point and the circular weld located within the same plane. During the welding process, the welding point remains fixed, and the transmission support unit 03 drives the components to rotate about their central axis to complete the welding process.

[0023] Specifically, base unit 01 includes a fixed base 1 and a movable base 2, and a power assembly 3 disposed between the fixed base 1 and the movable base 2. The fixed base 1 has a rectangular slot formed on one side, into which the movable base 2 slides. The power assembly 3 is mounted below the movable base 2, driving the movable base 2 to translate along the length of base unit 01, moving the movable base 2 closer to or further away from the fixed base 1.

[0024] Correspondingly, two groups of transmission support units 03 are also provided, and the two groups of transmission support units 03 are respectively provided on the fixed base 1 and the movable base 2. Before welding, the movable base 2 is away from the fixed base 1, and the lifting equipment lifts the two parts of the components to the two groups of transmission support units 03 respectively. After that, the power assembly 3 drives the movable base 2 close to the fixed base 1 so that the welding surfaces of the two parts are fully in contact. The use of this structure can facilitate the loading and welding work. The above-mentioned power assembly 3 can adopt conventional technologies such as screw transmission technology, hydraulic transmission technology, pneumatic transmission technology, etc., and no specific restrictions are made here.

[0025] Reference Figure 1 and Figure 2 The transmission support unit 03 includes a rotating transmission mechanism and a positioning support mechanism. Taking a single component to be welded as an example, the rotating transmission mechanism is arranged on both sides of the bottom of the component away from the welding unit 02, and the positioning support mechanism is arranged on both sides of the bottom of the component close to the welding unit 02. That is, the rotating transmission mechanism and the positioning support mechanism provide stable support for both ends. When the rotating transmission mechanism is in operation, the friction between the rotating transmission mechanism and the component drives the component to rotate. In this process, the positioning support unit plays a cooperating role.

[0026] Further, refer to Figure 3 The positioning support mechanism includes two groups of positioning support components 5 arranged opposite to each other. Each group of positioning support components 5 includes a fixed seat 51, a jack 52, a mounting frame 53 and a support roller 54. The fixed seat 51 is installed on the basic unit 01. The jack 52 is fixed in the fixed seat 51 and extends upward. One end of the mounting frame 53 is connected to the upper end of the jack 52, and the other end is rotatably connected to the fixed seat 51. The support roller 54 is installed in the mounting frame 53.

[0027] When the two components are placed on the transmission support unit 03, due to the large size of the pressure vessel components, it is difficult to determine their posture when hoisted onto the transmission support unit 03. Even if the rotary transmission mechanism and the positioning support mechanism can play a certain role in correction, there may still be a certain deviation between the welding surfaces of the two components, causing the two components to be staggered. At this time, the jack 52 is used to drive the mounting frame 53 and the support roller 54 to rotate. When the support roller 54 rotates upward, it applies an upward thrust to one side of the component, slightly lifting it up. When the support roller 54 rotates downward, one side of the component tilts downward due to its own weight. Through the setting of this mechanism, the welding surface can be adjusted to make the welding surface flat.

[0028] Preferably, the above-mentioned jack 52 is a hydraulic jack, and the two support rollers 54 of the positioning support mechanism are respectively connected to the two hydraulic jacks. The two hydraulic jacks can be controlled by a hydraulic system, which can drive the two hydraulic jacks to move synchronously through pipelines, thereby ensuring that the two support rollers 54 move synchronously.

[0029] Reference Figure 4 Corresponding to the positioning support mechanism, the rotary transmission mechanism is also composed of two sets of transmission components 4, so as to provide support for the parts to be welded from both sides. The transmission component 4 can be specifically composed of a transmission roller and a motor, which is not shown in the drawings. The transmission roller is driven by the motor to rotate, thereby driving the parts to be welded to rotate. It should be noted that the transmission rollers of the two sets of transmission components 4 should be able to rotate synchronously in the same direction. The rotation of the transmission rollers can be composed of two motors sharing the same control circuit, or it can be composed of a motor and a gear transmission component 4.

[0030] Furthermore, an auxiliary support mechanism is provided between the rotation transmission mechanism and the positioning support mechanism. The auxiliary support mechanism comprises two sets of oppositely disposed auxiliary support assemblies 6, and a damper 7 disposed between the two sets of auxiliary support assemblies 6. Each set of auxiliary support assemblies 6 comprises an auxiliary support roller 61 and two rotating arms 62. The two rotating arms 62 are parallel to each other and have their bottom ends rotatably connected to the base unit 01, while their top ends extend outward from the base unit 01. The auxiliary support roller 61 is rotatably mounted on the top ends of the two rotating arms 62.

[0031] Reference Figure 1 and Figure 5Each set of auxiliary support assemblies 6 has two rotating arms 62 spaced apart along the axial direction of the parts to be welded. The auxiliary support rollers 61 extend along the axial direction of the parts to be welded. When the parts to be welded are placed on the transmission support unit 03, the auxiliary support rollers 61 can fully contact the surface of the parts. With the above structure, the top of the auxiliary support rollers 61 of each set of auxiliary support assemblies 6 is initially higher than the rotation transmission mechanism and the positioning support mechanism. That is, when the parts are hoisted onto the transmission support unit 03, they first contact the auxiliary support rollers 61. When the auxiliary support rollers 61 are subjected to pressure, the pressure is transferred to the rotating arms 62. As a result, the angle between the two rotating arms 62 located in the same plane and belonging to different sets of auxiliary support assemblies 6 increases, and the damper 7 connected between the two rotating arms 62 undergoes elastic deformation.

[0032] As the angle increases, the auxiliary support rollers 61 of the two auxiliary support assemblies 6 decrease in height, ultimately reaching the same level as the tops of the rotary transmission mechanism and the positioning support mechanism. The rotary transmission mechanism, the positioning support mechanism, and the auxiliary support mechanism simultaneously support the components. Once the two components are welded to form the pressure vessel body, the lifting equipment removes it. At this point, the damper 7 recovers its deformation, driving the rotating arm 62 and auxiliary support rollers 61 back to their original position, ready for subsequent welding of a new pressure vessel.

[0033] It is understood that when each set of auxiliary support assemblies 6 has two rotating arms 62, there should also be two dampers 7 connecting the two sets of auxiliary support assemblies 6. The two dampers 7 are respectively connected between two rotating arms 62 in different sets that are located in the same vertical plane. When the component to be welded is hoisted horizontally onto the auxiliary support rollers 61, the auxiliary support rollers 61 of the two sets of auxiliary support assemblies 6 are subjected to the same force, and the two dampers 7 have the same deformation. The specific structure and working principle of the dampers 7 are common knowledge and will not be described in detail here.

[0034] Reference Figure 3 and Figure 6 A grinding unit 04 is also provided on the base unit 01 for grinding the annular weld before and after welding. The grinding unit 04 comprises a mounting platform 8, a grinding assembly 9, and a reciprocating drive mechanism. The reciprocating drive mechanism is mounted on the base unit 01 and located below the mounting platform 8. The mounting platform 8 is slidably connected to the base unit 01 to ensure that the mounting platform 8 can move along the length of the base unit 01. The grinding assembly 9 is mounted on the end of the mounting platform 8 away from the base unit 01. The reciprocating drive mechanism has multiple drive ends, which are divided into two groups. One group is used to drive the mounting platform 8 and the grinding assembly 9 to translate in a first direction, and the other group is used to drive the mounting platform 8 and the grinding assembly 9 to translate in a second direction opposite to the first direction, thereby achieving horizontal reciprocating movement of the mounting platform 8.

[0035] Specifically, refer to Figure 7 The reciprocating drive mechanism consists of two sets of relatively distributed reciprocating displacement components 10 and a drive component 12. Each set of reciprocating displacement components 10 includes two relatively distributed driven bevel gears 101, a driving bevel gear 102 disposed between and meshing with the two driven bevel gears 101, and two transmission shafts 103 connected to the two driven bevel gears 101. Each transmission shaft 103 is connected to a half gear 11. In conjunction with the half gear 11, a plurality of racks 13 are provided on the side of the mounting platform 8 facing the reciprocating drive mechanism. The racks 13 correspond one to one with the half gears 11.

[0036] With the above structure, when the driving bevel gear 102 rotates, the two driven bevel gears 101 rotate synchronously in the opposite direction, thereby driving the two transmission shafts 103 and the half gears 11 to rotate synchronously in the opposite direction. Due to the structural characteristics of the half gears 11, when the teeth of one of the half gears 11 engage with the rack 13, the rotation of the half gear 11 will drive the rack 13 and the mounting platform 8 to translate in the first direction. After that, the half gear 11 continues to rotate and the teeth eventually separate from the rack 13. At this time, the teeth of the other half gear 11 engage with the corresponding rack 13, and begin to drive the mounting platform 8 to translate in the second direction. As the two half gears 11 continue to rotate, the reciprocating movement of the mounting platform 8 is achieved. The provision of two sets of reciprocating drive transmission components 4 can improve the stability of the mounting platform 8 during the reciprocating movement.

[0037] Furthermore, the drive assembly 12 has two drive ends that can rotate synchronously in the same direction. The two drive ends are respectively connected to the active bevel gears 102 of the two sets of reciprocating displacement assemblies 10, so that the two active bevel gears 102 rotate synchronously, and the corresponding half gears 11 move synchronously, thereby driving the mounting platform 8 to move. The above-mentioned drive assembly 12 can be composed of a motor and a gear transmission assembly 4.

[0038] Reference Figure 7 The two sets of reciprocating displacement components 10 are preferably arranged at both ends of the mounting platform 8. The two transmission shafts 103 of each set of reciprocating displacement components 10 have different diameters, wherein the transmission shaft 103 with a larger diameter is connected to the driven bevel gear 101 located on the inner side, and the transmission shaft 103 with a larger diameter is hollow. The transmission shaft 103 with a smaller diameter is connected to the driven bevel gear 101 located on the outer side and passes through the transmission shaft 103 with a larger diameter. The two half gears 11 are respectively fixed on the two transmission shafts 103 as described above.

[0039] Furthermore, the mounting platform 8 includes a horizontal portion 81 slidably arranged on the base unit 01, and a vertical portion 82 arranged on one side of the horizontal portion 81 and rotatably connected to the horizontal portion 81. A driver 83 is provided between the horizontal portion 81 and the vertical portion 82 to drive the vertical portion 82 to rotate in a vertical plane relative to the horizontal portion 81. The above-mentioned grinding assembly 9 is arranged at one end of the vertical portion 82 away from the horizontal portion 81.

[0040] When the above structure is adopted, the staff can control the vertical part 82 to rotate in the vertical plane through the driver 83. When the parts to be welded are placed on the transmission support unit 03, the rotation of the vertical part 82 can control the grinding assembly 9 to approach or move away from the outer wall of the parts to be welded, which is convenient for adjusting the grinding depth and separating the grinding assembly 9 and the parts to be welded after grinding is completed.

[0041] The implementation principle of a circumferential seam welding device for pressure vessel production in an embodiment of the present application is as follows: initially, the two parts to be welded are respectively lifted by lifting equipment to two sets of transmission support units 03, and the parts first contact the auxiliary support mechanism. The auxiliary support roller 61 and the rotating arm 62 are compressed and the damper 7 is deformed at the same time, so that the parts to be welded move downward and finally fully contact with the transmission mechanism, the auxiliary support mechanism and the positioning support mechanism, and the three provide support from both sides of the parts to be welded at the same time.

[0042] After the parts to be welded are in place, the power assembly 3 drives the movable base 2 close to the fixed base 1 so that the welding surfaces of the two parts to be welded are fully in contact. Then the staff fine-tunes the joint by controlling the corresponding jack 52 to lift or lower it according to the docking conditions of the two parts, so that the two welding surfaces are flush and the weld is complete.

[0043] After docking is complete, the driver 83 of the grinding unit 04 is activated, controlling the rotation of the vertical portion 82 so that the grinding end of the grinding assembly 9 contacts the weld. At this point, the reciprocating drive mechanism and the grinding assembly 9 are activated, driving the mounting table 8 and the grinding assembly 9 back and forth. The grinding assembly 9 pre-processes the weld. During this pre-processing process, the transmission mechanism drives the welded parts to rotate.

[0044] When the polished weld passes the welding point for the first time, welding unit 02 starts welding the weld. The welded weld is polished again by polishing assembly 9 until the operator determines that the polishing work is complete. After that, polishing assembly 9 and reciprocating assembly 10 stop working, and driver 83 drives vertical portion 82 away from the pressure vessel. Finally, the completed pressure vessel is hoisted by lifting equipment to the next process.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A girth welding device for pressure vessel production, used for welding the circular cross-sections of two cylindrical pressure vessel components, characterized in that: include: A base unit (01) fixed on the ground, wherein a welding unit (02) and a transmission support unit (03) are provided on the base unit (01), the welding unit (02) is located on one side of the transmission support unit (03), and two cylindrical pressure vessel components are placed on the transmission support unit (03) for welding; The base unit (01) is further provided with a grinding unit (04) that cooperates with the welding unit (02). The grinding unit (04) includes a mounting table (8), a grinding assembly (9) and a reciprocating drive mechanism. The reciprocating drive mechanism is fixed to the base unit (01) and has a plurality of drive ends. The plurality of drive ends cooperate with the mounting table (8) to drive the mounting table (8) to move back and forth. The grinding assembly (9) is fixed to the mounting table (8).

2. The girth welding device for pressure vessel production according to claim 1, characterized in that: The reciprocating drive mechanism comprises two groups of relatively distributed reciprocating displacement components (10), two half gears (11) are respectively installed on the two groups of reciprocating displacement components (10), and each group of reciprocating displacement components (10) can drive the two half gears (11) matched therewith to rotate synchronously in opposite directions. A rack (13) is provided on the side of the mounting platform (8) facing the reciprocating drive mechanism, and the rack (13) is matched with each half gear (11).

3. The girth welding device for pressure vessel production according to claim 2, characterized in that: Each set of the reciprocating displacement components (10) includes two relatively distributed driven bevel gears (101), a driving bevel gear (102) arranged between the two driven bevel gears (101) and meshing with the two driven bevel gears (101), and two transmission shafts (103) respectively connected to the two driven bevel gears (101). The two half gears (11) are respectively mounted on the two transmission shafts (103). The reciprocating drive mechanism also includes a driving component (12) that simultaneously drives the driving bevel gears (102) of the two sets of reciprocating displacement components (10) to rotate in the same direction.

4. The girth welding device for pressure vessel production according to claim 1, characterized in that: The mounting platform (8) comprises a horizontal portion (81) slidably arranged on the base unit (01), and a vertical portion (82) arranged on one side of the horizontal portion (81) and rotatably connected to the horizontal portion (81), a driver (83) is arranged between the horizontal portion (81) and the vertical portion (82) to drive the vertical portion (82) to rotate relative to the horizontal portion (81) in a vertical plane, and the grinding assembly (9) is arranged at one end of the vertical portion (82) away from the horizontal portion (81).

5. The girth welding device for pressure vessel production according to claim 1, characterized in that: The transmission support unit (03) includes a rotation transmission mechanism and a positioning support mechanism. The rotation transmission mechanism is arranged at the end of the base unit (01), provides support for the ends of the two cylindrical pressure vessel components, and drives them to rotate. The positioning support mechanism is arranged at the middle of the base unit (01), provides support for the middle of the two cylindrical pressure vessel components and performs fine adjustment to make the welding surfaces of the two parts flush.

6. The girth welding device for pressure vessel production according to claim 5, characterized in that: The positioning support mechanism comprises two groups of positioning support assemblies (5) arranged opposite to each other, each group of the positioning support assemblies (5) comprising a fixed seat (51), a jack (52), a mounting frame (53) and a support roller (54), the fixed seat (51) being mounted on the base unit (01), the jack (52) being fixed in the fixed seat (51) and extending upward, one end of the mounting frame (53) being connected to the upper end of the jack (52), and the other end being rotatably connected to the fixed seat (51), and the support roller (54) being mounted in the mounting frame (53).

7. The girth welding device for pressure vessel production according to claim 5, characterized in that: The transmission support unit (03) further includes an auxiliary support mechanism, the auxiliary support mechanism being arranged between the rotation transmission mechanism and the positioning support mechanism, the auxiliary support mechanism including two groups of auxiliary support assemblies (6) arranged opposite to each other, and a damper (7) arranged between the two groups of auxiliary support assemblies (6).

8. The girth welding device for pressure vessel production according to claim 7, characterized in that: Each group of the auxiliary support components (6) comprises an auxiliary support roller (61) and two rotating arms (62), wherein the two rotating arms (62) are parallel to each other and have their bottom ends rotatably connected to the base unit (01), while their top ends extend outward from the base unit (01), and the auxiliary support roller (61) is rotatably mounted on the top ends of the two rotating arms (62).

9. A girth welding device for pressure vessel production according to any one of claims 1 to 8, characterized in that: The basic unit (01) comprises a fixed base (1) and a movable base (2), and a power assembly (3) arranged between the fixed base (1) and the movable base (2), wherein the power assembly (3) is used to drive the movable base (2) to move closer to or away from the fixed base (1), and the transmission support unit (03) is provided in two groups, and the two groups of transmission support units (03) are relatively distributed and respectively arranged on the fixed base (1) and the movable base (2).

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