A pressure vessel bolt tensioner installation and repositioning fixture

Abstract

This utility model discloses a fixture for installing and repositioning bolt tensioners for pressure vessels, including a lifting body, lifting mechanisms, and a free-torsion tool. The lifting body is connected to a crane hook via the free-torsion tool, which ensures that no torsion occurs between the crane hook and the lifting body. Eight lifting mechanisms are evenly spaced circumferentially around the lifting body. Each lifting mechanism is connected to a bolt tensioner corresponding to a main bolt on the circumferential direction of the pressure vessel's top flange end face, for lifting the corresponding bolt tensioner. The advantages are: with the assistance of a crane, the fixture can synchronously raise and lower eight bolt tensioners and align them evenly with the main bolts, avoiding manual handling and reducing the physical exertion of operators.

Description

Technical Field

[0001] This utility model relates to the field of bolt tensioner installation and repositioning technology, and in particular to a tooling for installing and repositioning pressure vessel bolt tensioners. Background Technology

[0002] High-pressure vessel flange sealing typically employs the expansion tension of the main bolts to achieve a pre-tightening sealing effect. In practice, multiple bolt tensioners are often used simultaneously. Based on the number of flange bolts, the pre-tightening of all flange bolts is completed in groups and stages to ensure that the pre-tightening load on all main bolts is uniform and reaches the specified load value.

[0003] Taking a flange with 56 main bolts as an example, according to the pre-tightening procedure of grouping and grading (in three levels) the main bolts, 8 sets of M72 bolt tensioners are needed to pre-tighten the 56 main bolts. See Figure 1 And Table 1.

[0004] Table 1 Grouping of Main Bolts

[0005]

[0006] The pre-tightening process for the 56 main bolts requires a single operator to install the bolt tensioner on the designated numbered main bolts on the top flange end face (see...). Figure 2 After the 8 sets of bolt tensioners are installed in place, they are used to tension the main bolts of the same group and tighten the nuts. After the bolts are pre-tightened, all 8 sets of bolt tensioners need to be disassembled and manually put on the next group of main bolts to pre-tighten the next group of main bolts.

[0007] The following problems exist during the entire pre-tightening process of the main bolts:

[0008] 1. The total weight of a single bolt tensioner is 22kg, which exceeds the national standard for single-person handling weight. Frequent assembly, disassembly, and repositioning of the bolt tensioner places high demands on the physical fitness of the operators.

[0009] 2. The bolt tensioner is fitted over the main bolt. When operated by a single person, the bolt tensioner needs to be raised over the upper surface of the main bolt and aligned with it for installation. Because the bolt tensioner is heavy and the clearance between the tensioner cylinder and the main bolt is small, the installation process can easily cause damage to the upper surface of the main bolt or the bolt thread surface. See [link / details]. Figure 3 . Utility Model Content

[0010] The purpose of this utility model is to provide a tooling for installing and repositioning pressure vessel bolt tensioners, thereby solving the aforementioned problems existing in the prior art.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0012] A pressure vessel bolt tensioner installation and repositioning fixture includes a lifting body, lifting mechanisms, and a free-torsion tool. The lifting body is connected to a crane hook via the free-torsion tool, which ensures that no torsion occurs between the crane hook and the lifting body. The lifting body is circumferentially and evenly spaced with eight lifting mechanisms, each of which is connected to a bolt tensioner corresponding to a main bolt on the circumferential side of the pressure vessel top cover flange, for lifting the corresponding bolt tensioner.

[0013] Preferably, the lifting device body includes a connecting block, a boom, side lifting lugs, and side lifting ropes; the connecting block is circumferentially evenly spaced with eight booms extending radially outward, and the extended ends of the booms are connected to a lifting mechanism; one of every two adjacent booms is provided with a side lifting lug, and the side lifting lug is connected to the free twisting tool via the side lifting rope.

[0014] Preferably, the lifting device body further includes a central lifting lug and a central lifting rope, the upper surface of the connecting block is provided with a central lifting lug, and the central lifting lug is connected to the free twisting tool via the central lifting rope.

[0015] Preferably, the lifting mechanism includes a shackle, a lifting ring, a connecting plate, and short chain links; the connecting plate is trapezoidal with a shorter upper section and a longer lower section; the upper and lower ends of the lifting ring are respectively connected to the extension end of the boom and the upper end of the connecting plate via a shackle; the lower end of the connecting plate is connected with two short chain links at intervals, and the two short chain links are respectively connected to the circumferential outer wall of the bolt tensioner.

[0016] Preferably, the extension end of the boom is provided with a boom connecting plate, and the shackle located at the upper end of the lifting ring is connected to the boom via the boom connecting plate.

[0017] Preferably, the bolt tensioner has two connecting lugs spaced apart on its circumferential outer wall. The two connecting lugs are symmetrically arranged along the axis of the bolt tensioner. Two short chain links on the connecting plate are respectively connected to the two connecting lugs to connect the lifting mechanism to the bolt tensioner.

[0018] Preferably, the shackle includes a U-shaped buckle and a fastener, with a fixing hole provided at each end of the U-shaped buckle, and the fastener passing through the fixing holes at both ends of the U-shaped buckle in sequence to form the shackle;

[0019] For the shackle located at the upper end of the lifting ring, the U-shaped buckle passes through the upper end of the lifting ring, and the fastener passes through the fixing hole and the upper connecting hole on the boom connecting plate in sequence to fix the shackle located at the upper end of the lifting ring to the boom; for the shackle located at the lower end of the lifting ring, the U-shaped buckle passes through the lower end of the lifting ring, and the fastener passes through the fixing hole and the lower connecting hole on the upper end of the connecting plate in sequence to fix the shackle located at the lower end of the lifting ring to the connecting plate.

[0020] Preferably, the free-torsion tool includes an end cap, a connecting ring, a bearing, a washer, an outer sleeve, and a slotted nut; the upper and lower ends of the outer sleeve are respectively fixedly connected to an end cap coaxial with it, and the end cap is connected to a connecting ring; the end cap is stepped, one end of the end cap extends into the interior of the outer sleeve, and the other end covers and abuts against the outer end of the outer sleeve; the end cap is provided with a mounting hole coaxial with it, and the end of the end cap extending into the outer sleeve is provided with a bearing; the connecting ring includes a lifting ring portion and a connecting shaft fixedly connected to one end of the lifting ring portion, the connecting shaft passes through the mounting hole and the bearing in sequence and is connected to the slotted nut, a washer is provided between the bearing and the slotted nut, and the slotted nut is fixedly connected to the connecting shaft via a pin; the lifting ring portion of the connecting ring located at the upper end of the outer sleeve is connected to the crane hook, and the lifting ring portion of the connecting ring located at the lower end of the outer sleeve is connected to the side lifting lug and / or the center lifting lug via the side lifting rope and / or the center lifting rope, respectively.

[0021] Preferably, at least one extension ring is sequentially connected to the lifting ring portion of the connecting ring at the upper end of the outer sleeve, and the uppermost extension ring is connected to the crane hook; at least one extension ring is sequentially connected to the lifting ring portion of the connecting ring at the lower end of the outer sleeve, and the lowermost extension ring is connected to the side lifting lug and / or the center lifting lug via the side lifting rope and / or the center lifting rope, respectively.

[0022] The beneficial effects of this utility model are: 1. With the assistance of an overhead crane, the tooling provided by this utility model can achieve synchronous lifting and lowering of eight sets of bolt tensioners, and evenly align them with the main bolts, avoiding manual handling and reducing the physical exertion of operators. 2. With the assistance of personnel, the free-torsion tool provided by this utility model can easily drive the lifting device to rotate flexibly in both directions, so that the bolt tensioners can be moved to the designated position, and the overhead crane hook and lifting rope do not twist. Attached Figure Description

[0023] Figure 1 This is a diagram showing the main bolt numbers on the flange end face of the pressure vessel top cover;

[0024] Figure 2 This is a schematic diagram showing the group layout of bolt tensioners;

[0025] Figure 3 This is a schematic diagram showing the connection between the bolt tensioner and the main bolts on the end face of the pressure vessel top cover flange.

[0026] Figure 4 This is a structural diagram of the installation and repositioning tooling in the embodiments of this utility model;

[0027] Figure 5 This is a schematic diagram of the lifting mechanism in an embodiment of this utility model;

[0028] Figure 6This is a schematic diagram of the free twisting tool in an embodiment of this utility model.

[0029] In the diagram: 1. Bolt tensioner; 2. High-pressure oil pipe; 3. Oil pump unit; 4. Pressure vessel cylinder; 5. Pressure vessel top cover; 6. Main nut; 7. Main bolt; 8. Connecting washer; 9. Connecting block; 10. Boom; 11. Center lifting lug; 12. Auxiliary fixing plate; 13. Side lifting lug; 14. Side lifting rope; 15. Boom connecting plate; 16. Shackle; 17. Lifting eye; 18. Connecting plate; 19. Short chain; 20. Connecting lifting lug; 21. Outer sleeve; 22. End cap; 23. Connecting ring; 24. Bearing; 25. Washer; 26. Slotted nut; 27. Extension lifting eye. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0031] like Figures 1 to 3 As shown, the pressure vessel top cover 5 and the pressure vessel cylinder 4 are connected by 56 main bolts 7 evenly distributed along the circumference of the pressure vessel. The upper ends of the main bolts 7 pass through connecting washers 8 and are fixedly connected to the main nuts 6, thus achieving a tight and stable connection between the pressure vessel top cover 5 and the pressure vessel cylinder 4. When the bolt tensioner 1 is in operation, it needs to be connected to the main bolts 7 to perform the tensioning of the main bolts 7 and the tightening of the nuts, thus completing the bolt pre-tightening. When eight sets of bolt tensioners 1 are used to pre-tighten a group of eight main bolts 7 simultaneously, the eight bolt tensioners 1 are connected by high-pressure oil pipes 2, which are connected to the oil pump unit 3. The oil pump unit 3 supplies oil to the bolt tensioners 1 through the high-pressure oil pipes 2, thereby realizing the tensioning of the main bolts 7 and the tightening of the nuts by the bolt tensioners 1.

[0032] To replace manual installation, disassembly, and handling of bolt tensioners 1, improve the efficiency of bolt tensioner 1 installation and repositioning, and avoid the risk of collision or damage to the main bolts 7 caused by human factors, this embodiment provides a pressure vessel bolt tensioner installation and repositioning fixture, including a lifting body, lifting mechanisms, and a free-torsion tool; the lifting body is connected to the overhead crane hook via the free-torsion tool, which is used to ensure that no torsion occurs between the overhead crane hook and the lifting body; the lifting body is circumferentially and evenly connected with eight lifting mechanisms, each of which is respectively connected to a bolt tensioner 1 that is circumferentially connected to the corresponding main bolt 7 of the flange end face of the pressure vessel top cover 5, for lifting the corresponding bolt tensioner 1.

[0033] 1. Lifting Gear Main Body

[0034] The main body of the lifting device is a frame structure of tooling, with eight branches. For example... Figure 4 The main body of the lifting device shown mainly includes a connecting block 9, booms 10, side lifting lugs 13, and side lifting ropes 14. Eight booms 10 extending radially outward are evenly spaced around the connecting block, and the extended ends of the booms 10 are connected to a lifting mechanism. One of every two adjacent booms 10 has a side lifting lug 13, which is connected to the free-torsion tool via the side lifting rope 14. The connecting block 9 is located in the center and connected to each boom 10. Channel steel forms the main channel structure of the lifting device body and the booms 10. The lifting device body also includes a central lifting lug 11 and a central lifting rope. The central lifting lug 11 is located on the upper surface of the connecting block 9 and is connected to the free-torsion tool via the central lifting rope. When the free-torsion tool is connected to the four side lifting lugs 13 on the four booms 10 via the side lifting rope 14, the free-torsion tool does not need to be connected to the central lifting lug 11 on the connecting block 9 via the central lifting rope. The central lifting lug 11 of the connecting block 9 is only an alternative connection method. When the central lifting lug 11 on the connecting block 9 is connected to the free twisting tool via the central lifting rope, it is not necessary to connect the side lifting lugs 13 on the four booms 10 via the side lifting ropes 14. In actual use, the connection method of side lifting lugs 13 and side lifting ropes 14 is preferred (i.e., Figure 4 (Connection method).

[0035] In practical applications, to enhance the stability between the lifting device body and the free-torsion tool during lifting, the free-torsion tool can be connected to the central lifting lug 11 and the side lifting lug 13 simultaneously via the central lifting rope and the side lifting rope 14, respectively. This improves the connection stability between the lifting device body and the free-torsion tool.

[0036] In this embodiment, since the free twisting tool is preferred to connect with the boom in actual use, the side lug 13 on the boom is prone to wear or even damage. Therefore, in order to facilitate the maintenance or replacement of the side lug 13, an auxiliary fixing plate 12 is added, and the side lug 13 is set on the auxiliary fixing plate 12. The auxiliary fixing plate 12 is used to indirectly connect the side lug 13 and the boom 10. When the side lug 13 needs maintenance or replacement, the auxiliary fixing plate 12 can be directly removed from the boom 10 and a new auxiliary fixing plate 12 with the side lug 13 can be installed, thereby avoiding the impact on the tooling usage progress due to the long maintenance cycle.

[0037] In this embodiment, the extended end of the boom 10 is provided with a boom connecting plate 15, and the boom 10 is connected to the lifting mechanism via the boom connecting plate 15.

[0038] 2. Lifting mechanism

[0039] The lifting mechanism is a component connected to the lifting device body and the bolt tensioner 1. The pitch circle diameter of the lifting mechanism in the circumferential direction is the same as the pitch circle diameter of the bolt holes in the circumferential direction of the pressure vessel, and they are evenly distributed. Figure 5 As shown, the lifting mechanism includes a shackle 16, a lifting ring 17, a connecting plate 18, and short chain links 19. The connecting plate 18 is trapezoidal with a shorter upper section and a longer lower section. The upper and lower ends of the lifting ring 17 are respectively connected to the extension end of the boom 10 and the upper end of the connecting plate 18 via a shackle 16. The lower end of the connecting plate 18 is connected with two short chain links 19 at intervals. The two short chain links 19 are respectively connected to the circumferential outer wall of the bolt tensioner 1.

[0040] In this embodiment, the circumferential outer wall of the bolt tensioner 1 is provided with two connecting lugs 20 at intervals. The two connecting lugs 20 are symmetrically arranged along the axis of the bolt tensioner 1. The two short ring chains 19 on the connecting plate 18 are respectively connected to the two connecting lugs 20 to connect the lifting mechanism to the bolt tensioner 1.

[0041] In this embodiment, the shackle 16 includes a U-shaped buckle and a fastener. A fixing hole is provided at each end of the U-shaped buckle, and the fastener passes through the fixing holes at both ends of the U-shaped buckle in sequence to form the shackle 16.

[0042] For the shackle 16 located at the upper end of the lifting ring 17, the U-shaped buckle passes through the upper end of the lifting ring 17, and the fastener passes through the fixing hole and the upper connecting hole on the boom connecting plate 15 in sequence to fix the shackle 16 located at the upper end of the lifting ring 17 to the boom 10; for the shackle 16 located at the lower end of the lifting ring 17, the U-shaped buckle passes through the lower end of the lifting ring 17, and the fastener passes through the fixing hole and the lower connecting hole at the upper end of the connecting plate 18 in sequence to fix the shackle 16 located at the lower end of the lifting ring 17 to the connecting plate 18.

[0043] 3. Free twisting tool

[0044] The free-twist tool is located at the top of the fixture, with its lower end connected to the main body of the lifting device via a hoisting rope and its upper end connected to the overhead crane. The two ends of the free-twist tool can rotate flexibly and independently without affecting each other. Its main function is to ensure the free and flexible rotation of the main body of the lifting device during the rotation of the bolt tensioner 1, while keeping the position of the overhead crane hook unchanged, thereby easily and synchronously adjusting the position of the eight bolt tensioners 1.

[0045] like Figure 6As shown, the free-twisting tool includes an end cap 22, a connecting ring 23, a bearing 24, a washer 25, an outer sleeve 21, and a slotted nut 26. An end cap 22, coaxial with the outer sleeve 21, is fixedly connected to both the upper and lower ends of the outer sleeve 21. A connecting ring 23 is connected to the end cap 22. The end cap 22 is stepped, with one end extending into the outer sleeve 21 and the other end covering and abutting the outer end of the outer sleeve 21. The end cap 22 has a coaxial mounting hole, and the end of the end cap 22 extending into the outer sleeve 21 is... The ring 23 includes a bearing 24; the connecting ring 23 includes a lifting ring portion and a connecting shaft fixedly connected to one end of the lifting ring portion. The connecting shaft passes through the mounting hole and the bearing 24 in sequence and is connected to the slotted nut 26. A washer 25 is provided between the bearing 24 and the slotted nut 26. The slotted nut 26 is fixedly connected to the connecting shaft via a pin. The lifting ring portion of the connecting ring 23 located at the upper end of the outer sleeve 21 is connected to the crane hook head. The lifting ring portion of the connecting ring 23 located at the lower end of the outer sleeve 21 is connected to the side lifting lug 13 and / or the center lifting lug 11 via the side lifting rope 14 and / or the center lifting rope, respectively.

[0046] The outer sleeve 21 is used to enclose the internal components. The bearing 24 mainly bears the axial load and allows the connecting ring 23 to rotate freely. The connecting ring 23 is pressed and fixed to the bearing 24 by a slotted nut 26 and a washer, allowing free torsion. The slotted nut 26 is threaded to the end of the connecting shaft and is secured with a pin to prevent loosening.

[0047] In this embodiment, at least one extension ring 27 is sequentially connected to the lifting ring portion of the connecting ring 23 at the upper end of the outer sleeve 21, with the uppermost extension ring 27 connected to the crane hook. At least one extension ring 27 is sequentially connected to the lifting ring portion of the connecting ring 23 at the lower end of the outer sleeve 21, with the lowermost extension ring 27 connected to the side lifting lug 13 and / or the center lifting lug 11 via the side lifting rope 14 and / or the center lifting rope, respectively. The number of extension rings 17 connected to the upper and lower ends of the outer sleeve 21 can be increased or decreased according to actual needs to better meet practical requirements.

[0048] In this embodiment, the specific process of installing and repositioning the pressure vessel bolt tensioner using the above-mentioned tooling is as follows:

[0049] 1. Place eight sets of bolt tensioners evenly on the first set of main bolts 7 on the flange end face of the pressure vessel top cover 5. The tension nut stretched by the bolt tensioner 1 is threadedly connected to the end of the main bolt 7.

[0050] 2. The overhead crane hook connects to the free-torsion tool, and the crane's movement raises the free-torsion tool to a suitable height;

[0051] 3. The free-torsion tool is connected to the main body of the lifting device via a lifting rope;

[0052] 4. Raise the overhead crane and move it directly above the pressure vessel. Make minor adjustments to the overhead crane to ensure that the installation and repositioning tooling is aligned with the pressure vessel.

[0053] 5. Manually rotate the installation and repositioning tooling to align the lifting mechanism with the connecting lug 20 on the bolt tensioner 1;

[0054] 6. Lower the overhead crane so that the short chain 19 of the lifting mechanism is connected to the connecting lug 20 of the bolt tensioner 1, thereby connecting the eight lifting mechanisms to the eight sets of bolt tensioners 1 respectively.

[0055] 7. Start the oil pump unit 3, use eight sets of bolt tensioners 1 to simultaneously tension the first set of main bolts 7 and tighten the main nuts 6 to complete the pre-tightening of the first set of main bolts 7, and then shut down the oil pump unit 3.

[0056] 8. The tension nut of the rotary bolt tensioner 1 is used to disengage it from the main bolt 7;

[0057] 9. Slowly raise the overhead crane so that the eight sets of bolt tensioners 1 rise synchronously until the bottom is higher than the upper surface of the first set of main bolts 7.

[0058] 10. Rotate the installation and repositioning fixtures to align the eight sets of bolt tensioners 1 with the next set of main bolts 7;

[0059] 11. Follow steps 7-10 to complete the pre-tightening of the remaining seven sets of main bolts 7.

[0060] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0061] This invention provides a fixture for installing and repositioning bolt tensioners on pressure vessels. With the assistance of an overhead crane, this fixture enables the synchronous lifting and lowering of eight bolt tensioners, aligning them evenly with the main bolt, eliminating the need for manual handling and reducing operator fatigue. The free-torsion tool provided in this invention, with manual assistance, can easily and flexibly rotate the lifting device in both directions, repositioning the bolt tensioners to the designated location without twisting the overhead crane hook or lifting rope.

[0062] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fixture for installing and repositioning pressure vessel bolt tensioners, characterized in that: The device includes a lifting body, lifting mechanisms, and a free-torsion tool. The lifting body is connected to the overhead crane hook via the free-torsion tool, which ensures that no torsion occurs between the overhead crane hook and the lifting body. The lifting body is circumferentially and evenly spaced with eight lifting mechanisms. Each lifting mechanism is connected to a bolt tensioner that is circumferentially connected to the main bolt of the pressure vessel top cover flange, and is used to lift the corresponding bolt tensioner.

2. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 1, characterized in that: The lifting device body includes a connecting block, a boom, side lifting lugs, and side lifting ropes; the connecting block is circumferentially evenly spaced with eight booms extending outward along its radial direction, and the extended ends of the booms are connected to a lifting mechanism; one of the booms in every two adjacent booms is provided with a side lifting lug, and the side lifting lug is connected to the free torsion tool via the side lifting rope.

3. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 2, characterized in that: The lifting device body also includes a central lifting lug and a central lifting rope. The upper surface of the connecting block is provided with a central lifting lug, and the central lifting lug is connected to the free twisting tool via the central lifting rope.

4. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 3, characterized in that: The lifting mechanism includes a shackle, a lifting ring, a connecting plate, and short chain links. The connecting plate is trapezoidal with a shorter upper section and a longer lower section. The upper and lower ends of the lifting ring are respectively connected to the extension end of the boom and the upper end of the connecting plate via a shackle. The lower end of the connecting plate is connected with two short chain links at intervals. The two short chain links are respectively connected to the circumferential outer wall of the bolt tensioner.

5. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 4, characterized in that: The extension end of the boom is provided with a boom connecting plate, and the shackle located at the upper end of the lifting ring is connected to the boom via the boom connecting plate.

6. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 4, characterized in that: The bolt tensioner has two connecting lugs spaced apart on its circumferential outer wall. The two connecting lugs are symmetrically arranged along the axis of the bolt tensioner. Two short chain links on the connecting plate are respectively connected to the two connecting lugs to connect the lifting mechanism to the bolt tensioner.

7. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 4, characterized in that: The shackle includes a U-shaped buckle and a fastener. Each end of the U-shaped buckle has a fixing hole, and the fastener passes through the fixing holes at both ends of the U-shaped buckle in sequence to form the shackle. For the shackle located at the upper end of the lifting ring, the U-shaped buckle passes through the upper end of the lifting ring, and the fastener passes through the fixing hole and the upper connecting hole on the boom connecting plate in sequence to fix the shackle located at the upper end of the lifting ring to the boom; for the shackle located at the lower end of the lifting ring, the U-shaped buckle passes through the lower end of the lifting ring, and the fastener passes through the fixing hole and the lower connecting hole on the upper end of the connecting plate in sequence to fix the shackle located at the lower end of the lifting ring to the connecting plate.

8. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 4, characterized in that: The free-torsion tool includes an end cap, a connecting ring, a bearing, a washer, an outer sleeve, and a slotted nut. An end cap, coaxial with the outer sleeve, is fixedly connected to both its upper and lower ends, and a connecting ring is attached to each end cap. The end cap is stepped, with one end extending into the outer sleeve and the other end covering and abutting against the outer end of the outer sleeve. The end cap has a coaxial mounting hole, and a bearing is located at the end of the end cap extending into the outer sleeve. The connecting ring includes a lifting ring portion and a connecting shaft fixedly connected to one end of the lifting ring portion. The connecting shaft passes through the mounting hole and the bearing in sequence and is connected to the slotted nut. A washer is provided between the bearing and the slotted nut. The slotted nut is fixedly connected to the connecting shaft via a pin. The lifting ring portion of the connecting ring located at the upper end of the outer sleeve is connected to the crane hook, and the lifting ring portion of the connecting ring located at the lower end of the outer sleeve is connected to the side lifting lug and / or the center lifting lug via a side lifting rope and / or a center lifting rope, respectively.

9. The pressure vessel bolt tensioner installation and repositioning fixture according to claim 8, characterized in that: At least one extension ring is sequentially connected to the lifting ring portion of the connecting ring located at the upper end of the outer sleeve, and the uppermost extension ring is connected to the crane hook; at least one extension ring is sequentially connected to the lifting ring portion of the connecting ring located at the lower end of the outer sleeve, and the lowermost extension ring is connected to the side lifting lug and / or the center lifting lug via the side lifting rope and / or the center lifting rope, respectively.

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