Horizontal circular seam assembly tool for pressure vessel

Abstract

The horizontal circular seam assembling tool for the pressure vessel comprises a steel base, two rows of supporting mechanisms are symmetrically arranged on the two sides of the base in parallel, each row of supporting mechanism is composed of a driving wheel system and two driven wheel systems which are coaxially arranged, the driving wheel systems are arranged in the middle of the base, and the driven wheel systems are arranged in the middle of the base. The two sides of the driving wheel system are each provided with a set of driven wheel system, the driving wheel system is composed of two rotatable driving wheels, the two driving wheels are driven by a hydraulic motor, the hydraulic motor is controlled by a hydraulic control system, and each set of driven wheel system is composed of a plurality of driven wheels capable of rotating and sliding in the axial direction. The tool is novel and compact in structure, small in occupied area, low in manufacturing cost, good in universality and suitable for shell rings with different diameters. In the assembling process, an operator only needs to stand on the ground beside the tool and can quickly complete assembling of multiple circumferential welds with high quality along with rotation of the shell ring, the assembling workload and difficulty are greatly reduced, operation is convenient and fast, efficiency is high, and the safety coefficient is high.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure vessel preparation, and in particular relates to a horizontal annular seam assembly tool for a pressure vessel. Background Art

[0002] When manufacturing cylindrical pipes or tower pressure vessels, manufacturers usually roll steel plates into cylindrical sections and then weld them together. These pressure vessels are basically non-standard equipment with different specifications and sizes, ranging from less than one meter to more than ten meters in diameter. When manufacturing large-diameter equipment, the construction efficiency is not high due to the large size of the workpiece, especially the girth weld assembly between adjacent cylinder sections, which is labor-intensive.

[0003] In the manufacturing process of large or super-large diameter pressure vessels made of rolled steel plates, three or four cylinder sections are usually assembled into a small section, and after the circumferential seams are welded, the small sections are assembled into a whole. To ensure straightness, the most common method is to use a simple tooling when assembling the small sections. The tooling consists of two parallel straight steel pipes. When assembling, the cylinder sections are hung one by one between the two straight steel pipes (such as Figure 1 As shown, Figure 1 In the figure, 7 is a cylinder section and 8 is a straight steel pipe). After finding the right position, use a manual hoist to close the two adjacent cylinder sections together. When the cylinder wall is thin, the cylinder section is not rigid enough, and the top will collapse due to its own weight, resulting in an elliptical shape with a smaller diameter in the vertical direction and a larger diameter in the horizontal direction. At this time, it is necessary to provide support facilities inside the cylinder section to restore it to a circle, and then spot weld and assemble them one by one. When using the above-mentioned assembly method, when assembling circumferential welds with larger diameters, the cylinder section cannot be easily rotated. For the upper part of the cylinder section, whether operating on the inside or outside of the cylinder section, scaffolding or climbing equipment is required to operate. In accordance with the requirements of safety production regulations and systems, qualified climbing facilities are required for high-altitude operations when the height exceeds 2 meters. If the cylinder wall is thin, the cylinder section is not rigid enough and is easily collapsed into an elliptical shape due to its own weight. Sometimes, the upper and lower parts between the two cylinder sections are closed, but the middle is open. It is necessary to support the inside to make the cylinder section return to a round shape, and then reduce the opening between the two cylinder sections for spot welding. During the assembly process, construction workers often need to climb up and down to operate, which invisibly increases the workload and difficulty of the assembly work, and also increases the safety risk factor of the operators.

[0004] There are also special assembly tools on the market, which are composed of multiple sets of rolling tires. The distance between each set of tires can be adjusted to facilitate the closing of the cylinder segments. Although the special assembly tool can make the cylinder segments rotate, which reduces the workers' need to climb up, if multiple cylinder segments are assembled together, multiple sets of corresponding tires must be prepared, and the initial cost investment is very high. In addition, the special assembly tool cannot solve the problem of deformation correction when the thin-walled cylinder segment collapses into an elliptical shape. It is also necessary to provide additional support facilities inside the cylinder segment. However, due to the large size of the tires, the distance between the two tires is relatively fixed. If the length of the cylinder segment is short, the support facilities cannot be placed.

[0005] Therefore, it is necessary to design an easy-to-operate, low-cost annular seam assembly tool for pressure vessels. As mentioned above, pressure vessels are basically non-standard equipment with different specifications and sizes. It is not realistic to design assembly tools for non-standard equipment of a single diameter. In view of this, the present invention proposes an economical and practical horizontal annular seam assembly tool for pressure vessels, which can be used for various medium and large diameter equipment to achieve safe and efficient annular seam assembly work. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a horizontal annular seam assembly tool for a pressure vessel in view of the deficiencies in the prior art. The tool is novel, compact, occupies a small area, has a low production cost, has good versatility, is easy to operate, is efficient, and has a high safety factor.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a horizontal annular seam assembly tool for a pressure vessel, comprising a steel base, two rows of support mechanisms are parallelly and symmetrically arranged on both sides of the base, each row of the support mechanisms is composed of a group of driving wheel systems and two groups of driven wheel systems arranged coaxially, the driving wheel system is arranged in the middle of the base, and a group of driven wheel systems is arranged on both sides of the driving wheel system, the driving wheel system is composed of two rotatable driving wheels, the rotation of the two driving wheels is driven by a hydraulic motor, and the hydraulic motor is controlled by a hydraulic control system, each group of the driven wheel system is composed of a number of rotatable and axially sliding driven wheels, during the assembly process, the cylinder segment to be assembled is supported by the driving wheel and the driven wheel, the cylinder segment is driven to rotate by the rotation of the driving wheel, and the cylinder segment is driven to move axially by the axial sliding of the driven wheel.

[0008] The horizontal annular seam assembly tooling of the present invention has a novel and compact structure, occupies a small area, has a low manufacturing cost, has good versatility, and is suitable for cylinder sections of different diameters. It can not only meet the needs of cylinder section assembly of conventional pressure vessels or towers (mainly with a diameter of 2 to 8 meters), but can also be used for welding of rolled pipes or pipe piles of extra-large diameters.

[0009] When the two cylinder sections are closed and aligned, the two cylinder sections can not only move towards each other and adjust the distance, but also rotate independently, thus realizing safe and efficient circumferential seam assembly. During the assembly process, one cylinder section is placed on the driving wheel and the other cylinder section is placed on the driven wheel. The driving wheel is powered by a hydraulic motor, which drives the cylinder section to rotate by rotation, and according to the distance between the two cylinder sections when they are closed, the driven wheel is axially slid to drive the cylinder section to move axially, so that the two cylinder sections are ready for assembly. After finding the correct position, several sections of positioning welds are spot welded on the circumferential seam that needs to be assembled between the two cylinder sections. As the driving wheel rotates, the cylinder section placed on the driven wheel and the cylinder section placed on the driving wheel can be driven to rotate together, so that the operator does not need to use scaffolding or climbing equipment to perform the operation, but only needs to stand on the ground next to the tooling. As the cylinder section rotates, the assembly of multiple circumferential welds can be completed quickly and with high quality, thereby greatly reducing the workload and difficulty of the assembly work. The operation is convenient, efficient and has a high safety factor.

[0010] Preferably, a rocker arm pressing system is provided on the base, and the rocker arm pressing system is provided outside the two rows of support mechanisms, and the rocker arm pressing system includes multiple sets of rocker arm assemblies, and the multiple sets of rocker arm assemblies are arranged at intervals along the longitudinal direction of the base, and each set of the rocker arm assemblies includes two rockers symmetrically arranged on both sides of the base, and the bottom end of each rocker arm is rotatably connected to the base, and a rotatable top wheel is installed on the top of each rocker arm, and each rocker arm is driven by a hydraulic cylinder, and the hydraulic cylinder is controlled by the hydraulic control system. When the ovality of the barrel section needs to be corrected, the two rockers arranged opposite to each other rotate towards each other under the drive of the corresponding hydraulic cylinder, and the generated pressure is transmitted to the barrel section through the corresponding top wheel, and the ovality correction is achieved by pressing the barrel section. The above-mentioned rocker arm pressing system is directly arranged on the tooling, and has a simple structure, and can conveniently and efficiently realize the ovality correction work of barrel sections of various specifications. After the assembly is completed, the rocker arm can be put down without affecting the hoisting operation of the barrel section. The hydraulic cylinder of each rocker arm assembly can independently adjust the pressure to meet the different pressure requirements for different cylinder segment ovality correction. When the rocker arm top pressure system is working, the hydraulic cylinder drives the two rockers set opposite to each other to rotate in opposite directions, and applies pressure to the cylinder segment through the top wheel, so as to reduce the horizontal diameter of the cylinder segment, thereby correcting the ellipse caused by the vertical diameter becoming smaller and the horizontal diameter becoming larger due to the collapse of the top of the cylinder segment due to its own weight. In addition to the above-mentioned function of correcting the ovality of the cylinder segment, the rocker arm top pressure system has two very practical auxiliary functions. First, when entering the spot welding link of the weld, when there is a misalignment in the weld, different pressures can be applied to the corresponding cylinder segment respectively by utilizing the characteristics that each rocker arm assembly can independently adjust the pressure, so as to make corrections very conveniently, thereby greatly reducing the use of work fixtures by other groups; second, the rockers raised on both sides, whether in the top pressure state or not, can play a safety protection role for the cylinder segment, preventing the large diameter cylinder segment from rolling down from the tooling when rotating and causing safety accidents. In the process of realizing the correction function and auxiliary function, the top wheel can convert the sliding friction into rolling friction, thereby reducing the resistance when the cylinder section rotates.

[0011] As a preferred embodiment, two sets of hydraulic traction systems are arranged on the base, each set of the hydraulic traction systems includes a double-headed hydraulic oil cylinder and two iron chains arranged along the longitudinal direction of the base, the double-headed hydraulic oil cylinder is installed in the middle of the base, the double-headed hydraulic oil cylinder is controlled by the hydraulic control system, and the two ends of the piston rod of the double-headed hydraulic oil cylinder are respectively fixed with one of the iron chains, and the ends of the two iron chains away from the double-headed hydraulic oil cylinder respectively extend out of the base, and each of the iron chains is installed with a plurality of detachable lifting buckles, and each of the lifting buckles is fixed with a hook, when it is necessary to drive the cylinder section on the driven wheel to move axially through the hydraulic traction system, after adjusting the position of the lifting buckle, the corresponding hook is hung on the outer edge of the cylinder section, and the double-headed hydraulic oil cylinder is started, so that the piston rod of the double-headed hydraulic oil cylinder moves in the set direction, and the cylinder section can be driven to move axially. Grease can be applied on the surface of the optical axis, and the sliding resistance of the driven wheel is very small. Under normal circumstances, manpower can be used to push the cylinder section placed on the driven wheel to slide and make it move closer to another cylinder section. When assembling large diameter thick wall cylinder sections, if it is inconvenient to push manually, the cylinder sections can be pulled by the above two sets of hydraulic traction systems. For cylinder sections of different lengths, the positions of the lifting buckle and the hook on the iron chain can be adjusted, and then the subsequent traction and pulling operation can be carried out.

[0012] Preferably, the driving wheel system is mounted on a plurality of first steel plates, which are respectively fixed vertically on the base, and two bearing seats are installed on the top of the plurality of first steel plates, each driving wheel is fixed on a main shaft, and the two main shafts are respectively rotatably mounted on the two bearing seats, and the two main shafts are connected via a coupling, and a transmission gear is fixed on one main shaft, and the transmission gear is connected to the hydraulic motor through the linkage of a multi-stage gear set, and the two sets of driven wheel systems are respectively mounted on a plurality of second steel plates, which are respectively fixed vertically on the base, and a plurality of shaft sleeves are installed on the top of the plurality of second steel plates, and each driven wheel can be axially slidably mounted on the optical axis, and the two ends of the optical axis are respectively fixed on the two shaft sleeves. The optical axis can be a whole long optical axis, or it can be designed so that an optical axis is fixed between every two shaft sleeves.

[0013] Preferably, each of the shaft sleeves is a shaft sleeve with upper and lower parts, the lower part of each of the shaft sleeves is fixed to the top of one of the second steel plates, and the upper part of each of the shaft sleeves is detachable. Since the driven wheel mainly bears the downward pressure from the cylinder section, the upper and lower parts of the shaft sleeve are adopted to facilitate the installation and replacement of the optical axis and the driven wheel.

[0014] Preferably, each of the optical axes is sleeved with a rubber telescopic hose to prevent welding splashes or objects from damaging the optical axis surface and to protect the grease.

[0015] Preferably, the inner sides of the first steel plate and the second steel plate on the same side of the base are connected together via a long steel plate, the bottom of the long steel plate is fixed to the base, and the long steel plate is inclined from top to bottom toward the inner side of the base. The long steel plate can improve the overall strength of the tooling and make the cross section of the entire tooling present a U-shaped structure, so that it can be suitable for cylinder sections of various diameters and can also maximize the rigidity of the base.

[0016] Compared with the prior art, the present invention has the following advantages: the horizontal annular seam assembly tooling for pressure vessels of the present invention is novel, compact, occupies a small area, has a low manufacturing cost, has good versatility, and is suitable for cylinder sections of different diameters. It can not only meet the needs of conventional pressure vessels or towers (mainly with a diameter of 2 to 8 meters), but can also be used for welding of rolled pipes or pipe piles of super-large diameters. During the assembly process, the operator does not need to use scaffolding or climbing equipment to perform the operation. He only needs to stand on the ground next to the tooling. As the cylinder section rotates, the assembly of multiple annular welds can be completed quickly and with high quality, thereby greatly reducing the workload and difficulty of the assembly work. The operation is convenient, efficient, and has a high safety factor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the most common simple assembly tooling in use;

[0018] Figure 2 This is an appearance diagram of the assembly tool in the embodiment;

[0019] Figure 3 A top view of the assembly tool in the embodiment;

[0020] Figure 4 A side view of the rocker arm pressing system in the embodiment in the use state;

[0021] Figure 1 to Figure 4 The specific reference numerals are as follows:

[0022] 1-base, 11-first steel plate, 12-bearing seat, 13-main shaft, 14-coupling, 15-transmission gear, 16-multi-stage gear set, 17-second steel plate, 18-sleeve, 19-rubber telescopic hose, 10-long steel plate, 2-driving wheel system, 21-driving wheel, 22-hydraulic motor, 3-driven wheel system, 31-driven wheel, 32-optical axis, 4-hydraulic control system, 51-rocker arm, 52-top wheel, 53-hydraulic cylinder, 54-pin hole, 55-axle pin, 56-support ear seat, 61-double-head hydraulic cylinder, 62-iron chain, 63-lifting buckle, 7-cylinder section, 8-straight steel pipe. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] The horizontal annular seam assembly tooling for the pressure vessel of the embodiment is as follows: Figure 2 to Figure 4 As shown, it includes a steel base 1, and two rows of supporting mechanisms are arranged in parallel and symmetrically on both sides of the base 1, each row of supporting mechanisms consists of a group of coaxially arranged driving wheel systems 2 and two groups of driven wheel systems 3 with different lengths, the driving wheel system 2 is arranged in the middle of the base 1, and a group of driven wheel systems 3 are arranged on both sides of the driving wheel system 2, the driving wheel system 2 consists of two rotatable driving wheels 21, the rotation of the two driving wheels 21 is driven by a hydraulic motor 22, and the hydraulic motor 22 is controlled by a hydraulic control system 4, each group of driven wheel systems 3 consists of a number of rotatable and axially sliding driven wheels 31, and during the pairing process, the barrel segment 7 to be paired is supported by the driving wheel 21 and the driven wheel 31, the barrel segment 7 is driven to rotate by the rotation of the driving wheel 21, and the barrel segment 7 is driven to move axially by the axial sliding of the driven wheel 31.

[0025] A rocker arm pressing system is provided on the base 1, and the rocker arm pressing system is arranged on the outside of the two rows of supporting mechanisms. The rocker arm pressing system includes multiple sets of rocker arm assemblies, and the multiple sets of rocker arm assemblies are arranged at intervals along the longitudinal direction of the base 1. Each set of rocker arm assemblies includes two rockers 51 symmetrically arranged on both sides of the base 1. The bottom end of each rocker arm 51 is rotatably connected to the base 1, and a rotatable top wheel 52 is installed on the top of each rocker arm 51. Each rocker arm 51 is driven by a hydraulic cylinder 53, and the hydraulic cylinder 53 is controlled by a hydraulic control system 4. When it is necessary to correct the ovality of the barrel section 7, the two rockers 51 arranged opposite to each other are driven by the corresponding hydraulic cylinder 53, and the generated pressure is transmitted to the barrel section 7 through the corresponding top wheel 52, and the ovality correction is achieved by pressing the barrel section 7.

[0026] Two sets of hydraulic traction systems are arranged on the base 1, each set of hydraulic traction systems includes a double-headed hydraulic cylinder 61 and two iron chains 62 arranged along the longitudinal direction of the base 1. The double-headed hydraulic cylinder 61 is installed in the middle of the base 1, and the double-headed hydraulic cylinder 61 is controlled by the hydraulic control system 4. An iron chain 62 is fixed to each end of the piston rod of the double-headed hydraulic cylinder 61, and one end of the two iron chains 62 away from the double-headed hydraulic cylinder 61 extends out of the base 1 respectively. A plurality of detachable lifting buckles 63 are installed on each iron chain 62, and a pull hook (not shown in the figure) is fixed on each lifting buckle 63. When it is necessary to drive the cylinder segment 7 on the driven wheel 31 to move axially through the hydraulic traction system, after adjusting the position of the lifting buckle 63, the corresponding pull hook is hung on the outer edge of the cylinder segment 7, and the double-headed hydraulic cylinder 61 is started to make the piston rod of the double-headed hydraulic cylinder 61 move in the set direction, thereby driving the cylinder segment 7 to move axially.

[0027] The driving wheel system 2 is mounted on a plurality of first steel plates 11, which are respectively welded vertically and fixed on the base 1, and two bearing seats 12 are installed on the top of the plurality of first steel plates 11. Each driving wheel 21 is fixed on a main shaft 13, and the two main shafts 13 are respectively rotatably mounted on the two bearing seats 12. The two main shafts 13 are connected via a coupling 14, and a transmission gear 15 is fixed on one main shaft 13. The transmission gear 15 is connected to the hydraulic motor 22 through the linkage of a multi-stage gear set 16. Two sets of driven wheel systems 3 are respectively mounted on a plurality of second steel plates 17, and a plurality of second steel plates 17 are respectively welded vertically and fixed on the base 1. A plurality of shaft sleeves 18 are installed on the top of the plurality of second steel plates 17, and each driven wheel 31 can be axially slidably mounted on the optical axis 32, and the two ends of the optical axis 32 are respectively fixed on the two shaft sleeves 18. The diameter of each optical axis 32 is 80 mm, and each optical axis 32 is provided with a rubber telescopic hose 19 ( Figure 3 A small amount of rubber telescopic hose 19 is shown in the figure. Each sleeve 18 is an upper and lower split sleeve 18. The lower part of each sleeve 18 is fixed to the top of a second steel plate 17, and the upper part of each sleeve 18 is detachable.

[0028] The inner sides of the first steel plate 11 and the second steel plate 17 on the same side of the base 1 are connected together via a long steel plate 10 , the bottom of the long steel plate 10 is welded and fixed to the base 1 , and the long steel plate 10 is inclined from top to bottom toward the inner side of the base 1 .

[0029] In this embodiment, the base 1 is rectangular. Since the conventional length of the cylinder section 7 is about 2 meters, usually 3 to 5 cylinder sections 7 are first assembled into small sections. Therefore, the length of the base 1 is about 10 meters, the width is about 2.5 meters, and it has a certain rigidity. The distance between the two rows of support mechanisms meets the conventional assembly requirements of the cylinder section 7 with a diameter of 2 to 6 meters. In this embodiment, the appearance structure of multiple rocker arms 51 is similar to that of a human hand. They are welded from steel plates, hollow, and the cross-sectional shape gradually becomes thinner from bottom to top. A pin hole 54 is provided at the bottom end of each rocker arm 51, and a plurality of first steel plates 11 and second steel plates 17 are respectively fixed with shaft pins 55. The pin hole 54 cooperates with the shaft pin 55 to serve as the center of rotation of the rocker arm 51. At the same time, a lug seat 56 is fixedly connected to the bottom end of each rocker arm 51, and each lug seat 56 is hinged to the piston rod of a hydraulic cylinder 53. In this embodiment, the torque ratio of each rocker arm 51 is about 1:8, and a hydraulic cylinder 53 with an output thrust of 20 tons is selected so that the top wheel 52 at the top of the rocker arm 51 can generate a pressure of more than 2 tons, which can basically meet the ovality correction work caused by the deadweight of the conventional cylinder section 7.

[0030] The horizontal annular seam assembly tool for the pressure vessel takes into account the closing, rotation and ovality correction of the cylinder section 7 when closing and aligning the cylinder section 7, and these tasks can be performed simultaneously.

[0031] When the two cylinder segments 7 are closed and aligned, the two cylinder segments 7 can not only move toward each other and adjust the distance between them, but also rotate independently, thereby realizing safe and efficient annular seam assembly work. During the pairing process, one cylinder segment 7 is placed on the driving wheel 21, and the other cylinder segment 7 is placed on the driven wheel 31. The driving wheel 21 is powered by the hydraulic motor 22, and drives the cylinder segment 7 to rotate by rotation. According to the distance between the two cylinder segments 7 when they are closed, the driven wheel 31 is made to slide axially to drive the cylinder segment 7 to move axially, so that the two cylinder segments 7 are ready for pairing. After finding the correct orientation, several sections of positioning welds are spot welded on the annular seams that need to be paired between the two cylinder segments 7. As the driving wheel 21 rotates, the cylinder segment 7 placed on the driven wheel 31 and the cylinder segment 7 placed on the driving wheel 21 can be driven to rotate together, so that the operator does not need to use scaffolding or climbing equipment to perform climbing operations, but only needs to stand on the ground next to the tooling. As the cylinder segment 7 rotates, the pairing of multiple annular welds can be completed quickly and with high quality, thereby greatly reducing the workload and difficulty of the pairing work, and the operation is convenient, efficient and has a high safety factor.

[0032] When the rocker arm pressing system is working, the hydraulic cylinder 53 drives the two rocker arms 51 arranged opposite to each other to rotate towards each other, so that the rocker arms 51 rotate around the center line of the axle pin, and exert pressure on the cylinder section 7 through the opposite top wheels 52, so as to reduce the horizontal diameter of the cylinder section 7, thereby correcting the elliptical shape caused by the vertical diameter becoming smaller and the horizontal diameter becoming larger due to the collapse of the top of the cylinder section 7 due to its own weight.

Claims

1. A horizontal annular seam assembly tool for a pressure vessel, characterized in that: It comprises a steel base, two rows of supporting mechanisms are arranged in parallel and symmetrically on both sides of the base, each row of the supporting mechanisms consists of a group of driving wheel systems and two groups of driven wheel systems which are arranged coaxially, the driving wheel system is arranged in the middle of the base, and a group of driven wheel systems are arranged on both sides of the driving wheel system, the driving wheel system consists of two rotatable driving wheels, the rotation of the two driving wheels is driven by a hydraulic motor, and the hydraulic motor is controlled by a hydraulic control system, each group of the driven wheel system consists of a number of rotatable and axially sliding driven wheels, and during the pairing process, the cylinder segment to be paired is supported by the driving wheel and the driven wheel, the cylinder segment is driven to rotate by the rotation of the driving wheel, and the cylinder segment is driven to move axially by the axial sliding of the driven wheel.

2. The horizontal annular seam assembly tool for a pressure vessel according to claim 1, characterized in that: A rocker arm pressing system is arranged on the base, and the rocker arm pressing system is arranged on the outer sides of the two rows of supporting mechanisms. The rocker arm pressing system includes multiple sets of rocker arm assemblies, and the multiple sets of rocker arm assemblies are arranged at intervals along the longitudinal direction of the base. Each set of the rocker arm assemblies includes two rockers symmetrically arranged on both sides of the base, and the bottom end of each rocker arm is rotatably connected to the base, and a rotatable top wheel is installed on the top of each rocker arm. Each rocker arm is driven by a hydraulic cylinder, and the hydraulic cylinder is controlled by the hydraulic control system. When the ovality of the cylinder section needs to be corrected, the two rockers arranged opposite to each other rotate towards each other under the drive of the corresponding hydraulic cylinder, and the generated pressure is transmitted to the cylinder section through the corresponding top wheel, and the ovality correction is achieved by pressing the cylinder section.

3. The horizontal annular seam assembly tool for a pressure vessel according to claim 1, characterized in that: Two sets of hydraulic traction systems are arranged on the base, each set of the hydraulic traction systems includes a double-headed hydraulic cylinder and two iron chains arranged along the longitudinal direction of the base, the double-headed hydraulic cylinder is installed in the middle of the base, the double-headed hydraulic cylinder is controlled by the hydraulic control system, and the two ends of the piston rod of the double-headed hydraulic cylinder are respectively fixed with one of the iron chains, and the ends of the two iron chains away from the double-headed hydraulic cylinder respectively extend out of the base, and each of the iron chains is installed with a plurality of detachable lifting buckles, and each of the lifting buckles is fixed with a hook. When it is necessary to drive the cylinder segment on the driven wheel to move axially through the hydraulic traction system, after adjusting the position of the lifting buckle, the corresponding hook is hung on the outer edge of the cylinder segment, and the double-headed hydraulic cylinder is started to make the piston rod of the double-headed hydraulic cylinder move in the set direction, thereby driving the cylinder segment to move axially.

4. A horizontal annular seam assembly tool for a pressure vessel according to any one of claims 1 to 3, characterized in that: The driving wheel system is mounted on a plurality of first steel plates, which are respectively fixed vertically on the base, and two bearing seats are installed on the top of the plurality of first steel plates. Each driving wheel is fixed on a main shaft, and the two main shafts are respectively rotatably installed on the two bearing seats, and the two main shafts are connected via a coupling. A transmission gear is fixed on one main shaft, and the transmission gear is connected to the hydraulic motor through the linkage of a multi-stage gear set. The two sets of driven wheel systems are respectively mounted on a plurality of second steel plates, which are respectively fixed vertically on the base, and a plurality of shaft sleeves are installed on the top of the plurality of second steel plates. Each driven wheel can be axially slidably installed on the optical axis, and the two ends of the optical axis are respectively fixed on the two shaft sleeves.

5. The horizontal annular seam assembly tool for a pressure vessel according to claim 4, characterized in that: Each of the shaft sleeves is a split shaft sleeve with upper and lower parts, the lower part of each of the shaft sleeves is fixed on the top of a second steel plate, and the upper part of each of the shaft sleeves is detachable.

6. The horizontal annular seam assembly tool for a pressure vessel according to claim 4, characterized in that: Each optical axis is sleeved with a rubber telescopic hose.

7. The horizontal annular seam assembly tool for a pressure vessel according to claim 4, characterized in that: The inner sides of the first steel plate and the second steel plate on the same side of the base are connected together via a long steel plate, the bottom of the long steel plate is fixed to the base, and the long steel plate is inclined from top to bottom toward the inner side of the base.

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