A hoisting device for a nuclear reactor pressure vessel head

Abstract

The application discloses a hoisting device for a nuclear reactor pressure vessel top cover and relates to the technical field of hoisting of nuclear reactor pressure vessels.The hoisting device comprises supporting legs, two lifting frames movably arranged at the upper ends of the supporting legs, a moving platform fixedly arranged between the two lifting frames, a mounting frame fixedly arranged below the moving platform, a plurality of connecting assemblies uniformly and interval arranged at the bottom of the mounting frame, a lifting seat movably arranged at the middle of the bottom of the mounting frame, a plurality of hydraulic assemblies movably arranged at the side edges of the lifting seat, and the number of the hydraulic assemblies is the same as that of the connecting assemblies, and the hydraulic assemblies and the connecting assemblies are in one-to-one correspondence.The connecting assembly comprises a sleeve movably arranged at the bottom edge of the mounting frame and a movable shaft elastically connected to the inside of the lower end of the sleeve.The application realizes the corresponding position transformation of the container top cover in the horizontal and vertical directions by pushing or pulling the corresponding movable shaft through the hydraulic assembly, and the container top cover can be in a horizontal state after adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear reactor pressure vessel hoisting, in particular to a nuclear reactor pressure vessel head hoisting device. BACKGROUND

[0002] The hoisting of the nuclear reactor pressure vessel head is a complex and precise process that requires the use of multiple specialized techniques and equipment. The hoisting of the head must ensure safety, accuracy, and efficiency, as any mistakes can lead to serious consequences. During the hoisting process, the head must be lifted and moved smoothly, and the hoisting process must be precisely controlled.

[0003] In the existing nuclear reactor pressure vessel head hoisting, a crane and its traction structure are usually used to hoist the head, including a sling, a davit, and a hook. The sling connects the davit, which is pulled by the sling, the davit is installed at the bottom of the davit, the hook is connected at the bottom of the davit, and the hook hooks the head. This device uses multiple davits and hooks to distribute the weight of the head, each davit has a hook at the bottom, and the hook hooks the head's lifting lug.

[0004] Using the existing device to hoist the head, the length of the davit cannot be adjusted, and the position and attitude of the head cannot be adjusted after the hook is hooked. When the sling pulls the davit, the davit, and the hook, and the hook hooks the head, due to the asymmetric structure of the head and the uneven distribution of its own weight, the hoisted head will be in an inclined state, causing each hook to be unstable and hooking the head's lifting lug, which poses a safety hazard during hoisting. When the container head is in an inclined state, it is difficult to align the container head with the container cylinder when hoisting the container head above the container cylinder, making it inconvenient to install the container head on the container cylinder. The size range of the head that can be hoisted by this device is affected by the length of the davit, and the length of the davit cannot be adjusted, limiting the size range of the head that can be hoisted, and the use is limited. Therefore, we propose a nuclear reactor pressure vessel head hoisting device. SUMMARY

[0005] The purpose of the present application is to provide a nuclear reactor pressure vessel head hoisting device that can effectively solve the problems raised in the background art.

[0006] To solve the above technical problems, the present application is realized by the following technical scheme:

[0007] The application discloses a hoisting device for a nuclear reactor pressure vessel top cover, which comprises supporting legs, two lifting frames movably arranged at the upper ends of the supporting legs, a moving platform fixedly arranged between the two lifting frames, a mounting frame fixedly arranged below the moving platform, a plurality of connecting assemblies uniformly and spacedly arranged at the bottom of the mounting frame, a lifting seat movably arranged at the middle of the bottom of the mounting frame, and a plurality of hydraulic assemblies movably arranged at the side of the lifting seat and uniformly and spacedly distributed, wherein the number of the hydraulic assemblies is the same as that of the connecting assemblies and the hydraulic assemblies and the connecting assemblies are in one-to-one correspondence.

[0008] The connecting assembly comprises a sleeve movably arranged at the edge of the bottom of the mounting frame, a movable shaft elastically coupled to the inside of the lower end of the sleeve, and a connecting hook movably arranged at the bottom of the movable shaft, wherein the lower end of the movable shaft penetrates through the sleeve, the connecting hook is movably arranged at the bottom of the movable shaft, and the output end of the hydraulic assembly is movably connected with the movable shaft in the corresponding connecting assembly.

[0009] Preferably, the moving platform comprises slide rails, a slide base, a slide table, a positioning seat, a connecting seat and a fixing rod, two slide rails are fixedly arranged between the two lifting frames, the two lifting frames and the two slide rails form a rectangular structure, the slide base is movably arranged above the two slide rails, the slide table is movably arranged at the inner side of the lower end of the slide base, the positioning seat is fixedly arranged below the slide table, the connecting seat is fixedly arranged below the positioning seat, the upper end of the fixing rod is fixedly arranged at the bottom side of the connecting seat, the lower end of the fixing rod is fixedly arranged at the upper edge of the mounting frame, and the bottom side of the connecting seat is uniformly and spacedly provided with a plurality of fixing rods.

[0010] Preferably, the bottom of the connecting seat is fixedly provided with a positioning pipe, the bottom of the positioning pipe is fixedly connected with the mounting frame, the middle of the mounting frame is provided with a through hole, the inside of the connecting seat and the positioning pipe is fixedly provided with a first hydraulic rod, the output end of the first hydraulic rod penetrates through the inside of the through hole, the output end of the first hydraulic rod is fixedly provided with a connecting rod, and the connecting rod is fixedly connected with the lifting seat.

[0011] Preferably, the connecting assembly further comprises a sliding block movably arranged above the inside of the sleeve, the sliding block is fixedly arranged above the movable shaft, the bottom of the sleeve is fixedly provided with a cover, the movable shaft penetrates through the inside of the cover, the side of the movable shaft is sleeved with a spring, the bottom of the spring abuts against the cover, and the upper end of the spring abuts against the sliding block.

[0012] Preferably, the inner wall of the sleeve is fixedly provided with a limiting plate, the side of the sliding block is provided with a limiting groove, the limiting plate is just clamped in the inside of the limiting groove, and a gap exists between the limiting plate and the inner wall of the limiting groove.

[0013] Preferably, the bottom edge of the mounting frame is fixedly provided with a first connecting plate, the upper end of the sleeve is movably connected with the first connecting plate, the sleeve rotates below the first connecting plate, the side of the lifting seat is fixedly provided with a plurality of second connecting plates, the upper end of the hydraulic assembly is movably connected with the second connecting plates, the hydraulic assembly rotates on one side of the second connecting plates, the lower end of the side of the movable shaft is fixedly provided with a third connecting plate, the output end of the hydraulic assembly is movably connected with the third connecting plate, and the output end of the hydraulic assembly rotates on one side of the third connecting plate.

[0014] Preferably, the bottom of the movable shaft is fixedly provided with a fixing frame, the inside of the fixing frame is movably provided with a rotating plate, the bottom of the rotating plate is fixedly provided with a spherical shell, the inside of the spherical shell is rotatably provided with a ball head, and the connecting hook is fixedly installed below the ball head.

[0015] Preferably, the inside of the upper end of the supporting leg is fixedly provided with a second hydraulic rod, the top output end of the second hydraulic rod is fixedly connected with the lifting frame, the bottom of the lifting frame is fixedly provided with a guide shaft, the upper end of the supporting leg is provided with a guide groove matched with the guide shaft in the inside, and the guide shaft slides in the inside of the guide groove.

[0016] Preferably, the upper end of the sealing cover is fixedly provided with a first sealing ring, the outer wall of the first sealing ring abuts against the inner wall of the bottom barrel opening of the sleeve, the upper end of the sealing cover is fixedly provided with a second sealing ring, and the inner wall of the second sealing ring abuts against the side wall of the movable shaft.

[0017] Preferably, the inside of the sleeve is filled with damping lubricating grease.

[0018] The present application has the following advantages:

[0019] 1. By using the hydraulic assembly to pull the movable shaft, the connecting hook moves to the middle of the bottom of the mounting frame, i.e. moves to the lifting lug of the container top cover, and finally each connecting hook hooks the corresponding lifting lug of the container top cover, so that the device can be used to lift the nuclear reactor pressure vessel top cover with a smaller size. By using the hydraulic assembly to push the movable shaft, the connecting hook moves outward, so that the device is connected to the container top cover, and the device can be used to lift the nuclear reactor pressure vessel top cover with a larger size. By adjusting the extension length of the output end of each hydraulic assembly, the extension length of the different movable shafts in the corresponding sleeves is adjusted, the connecting hook hooks the corresponding lifting lug of the container top cover, and after the container top cover is lifted, the hydraulic assembly is continuously adjusted, so that the extension length of the output end of each hydraulic assembly is consistent, and the container top cover can be moved to the position directly below the mounting frame. When the container top cover is lifted to the position above the container barrel, the position of the container top cover can be further adjusted.

[0020] 2、The present application, by adjusting the corresponding hydraulic assembly according to the deviation position of the container top cover on the container barrel, the hydraulic assembly is provided with at least three, the hydraulic assembly realizes the corresponding position transformation of the container top cover in horizontal and vertical directions by pushing or pulling the corresponding movable shaft, and can make the container top cover be in a horizontal state after adjustment. Therefore, the device can realize fine adjustment of the position of the container top cover, and ensure that the container top cover is directly opposite the container barrel. Based on the operation, the problem that the container top cover is not convenient to align the container barrel due to the uneven weight distribution of the container top cover itself during the lifting process of the lifting device can be solved, and the posture adjustment of the top cover is realized.

[0021] 3、The present application, using the hydraulic assembly to push the movable shaft, makes the connecting hooks move outward, so that the multiple connecting hooks are far away from each other, and the container top cover of larger size can be lifted. When the output end of the hydraulic assembly is the longest, the device can also move the lifting seat downward, so that the hydraulic assembly pushes the movable shaft out of the sleeve, which makes the multiple connecting hooks further far away from each other to hook the lifting lugs of the container top cover of larger size. Therefore, the device can lift the container top cover of larger size, and the size range of the container top cover that can be lifted is larger.

[0022] 4、The present application, by adjusting the extension length of the output end of the hydraulic assembly, the deflection angle of the hydraulic assembly can be adjusted, and the deflection angle of the sleeve and the movable shaft as a whole can be adjusted, so that the hydraulic assembly and the connecting assembly can bear the weight of the container top cover more evenly, and avoid that one of the hydraulic assembly or the connecting assembly is damaged or has reduced service life due to excessive stress. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0024] Figure 1 It is a perspective view of a lifting device for a nuclear reactor pressure vessel top cover of the present application;

[0025] Figure 2 It is a perspective view of a mounting frame, a connecting assembly and a hydraulic assembly of a lifting device for a nuclear reactor pressure vessel top cover of the present application;

[0026] Figure 3 It is a front view of a connecting assembly of a lifting device for a nuclear reactor pressure vessel top cover of the present application;

[0027] Figure 4A part of the middle of the lifting device of the nuclear reactor pressure vessel head Figure 3 A part of the middle of the lifting device of the nuclear reactor pressure vessel head

[0028] Figure 5 A part of the middle of the lifting device of the nuclear reactor pressure vessel head Figure 3 A part of the middle of the lifting device of the nuclear reactor pressure vessel head

[0029] Figure 6 A part of the middle of the lifting device of the nuclear reactor pressure vessel head

[0030] Figure 7 A part of the middle of the lifting device of the nuclear reactor pressure vessel head

[0031] Figure 8 A part of the middle of the lifting device of the nuclear reactor pressure vessel head

[0032] Figure 9 A part of the middle of the lifting device of the nuclear reactor pressure vessel head

[0033] In the drawings, the components represented by each reference numeral are listed as follows:

[0034] 1, foot; 2, lifting frame; 3, moving platform; 31, slide rail; 32, slide seat; 33, slide table; 34, positioning seat; 35, connecting seat; 36, fixed rod; 4, mounting frame; 5, connecting assembly; 51, sleeve; 52, movable shaft; 53, connecting hook; 54, sliding block; 6, lifting seat; 7, hydraulic assembly; 8, positioning pipe; 9, through opening; 10, first hydraulic rod; 11, connecting rod; 12, spring; 13, first connecting plate; 14, second connecting plate; 15, third connecting plate; 16, limiting plate; 17, limiting groove; 18, fixing frame; 19, rotating plate; 20, spherical shell; 21, ball head; 22, second hydraulic rod; 23, guide shaft; 24, guide groove; 25, first sealing ring; 26, second sealing ring; 27, cover. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Embodiment: Please refer to Figure 1 - Figure 9As shown, a lifting device for a nuclear reactor pressure vessel head cover comprises a support leg 1, two lifting frames 2 movably arranged at the upper end of the support leg 1, a moving platform 3 fixedly arranged between the two lifting frames 2, a mounting rack 4 fixedly arranged below the moving platform 3, a plurality of connecting assemblies 5 uniformly and spacedly arranged at the bottom of the mounting rack 4, a lifting seat 6 movably arranged at the middle of the bottom of the mounting rack 4, a plurality of hydraulic assemblies 7 movably arranged at the side of the lifting seat 6 and uniformly and spacedly distributed, and the number of the hydraulic assemblies 7 is the same as that of the connecting assemblies 5 and they are one-to-one corresponding.

[0037] Based on the device, when in use, the nuclear reactor pressure vessel head cover is placed below the mounting rack 4, the overall length of the connecting assembly 5 is adjusted by the hydraulic assembly 7, the connecting assembly 5 is connected to the nuclear reactor pressure vessel head cover, then the lifting frame 2 is adjusted upward, the pressure vessel head cover is pulled upward, then the position of the pressure vessel head cover is adjusted by adjusting the moving platform 3, after the pressure vessel head cover is lifted above the nuclear reactor pressure vessel cylinder, the overall length of the corresponding connecting assembly 5 is adjusted by adjusting the different hydraulic assemblies 7, the position and posture of the pressure vessel head cover are fine-adjusted, the pressure vessel head cover is opposite to the nuclear reactor pressure vessel cylinder, the position of the pressure vessel head cover is fine-adjusted, finally the height of the lifting frame 2 is adjusted downward, and the nuclear reactor pressure vessel head cover is seated on the vessel cylinder.

[0038] The connecting assembly 5 comprises a sleeve 51 movably arranged at the edge of the bottom of the mounting rack 4, a movable shaft 52 elastically coupled to the inside of the lower end of the sleeve 51, and a connecting hook 53, the lower end of the movable shaft 52 penetrates through the sleeve 51, the connecting hook 53 is movably arranged at the bottom of the movable shaft 52, the output end of the hydraulic assembly 7 is movably connected with the movable shaft 52 in the corresponding connecting assembly 5. The connecting hook 53 is movably arranged at the bottom of the movable shaft 52 and the connecting hook 53 always keeps vertical state, in the case that the movable shaft 52 is pushed or pulled by the hydraulic assembly 7, it is ensured that the connecting hook 53 can firmly hook the lifting lug of the vessel head cover, avoiding the lifting lug of the vessel head cover from falling off the connecting hook 53 and avoiding lifting accidents. The hydraulic assembly 7 is in a conventional installation mode. The movable shaft 52 and the sleeve 51 are elastically coupled, so that the extension length of the movable shaft 52 at the bottom of the sleeve 51 is adjustable. The movable shaft 52 is pulled inside the sleeve 51.

[0039] The nuclear reactor pressure vessel head is placed below the mounting frame 4, and the device is used for lifting. In order to solve the problem that the existing lifting device is not convenient to connect the nuclear reactor pressure vessel head, based on the design, when the nuclear reactor pressure vessel head is small, the nuclear reactor pressure vessel head is located between the plurality of connecting assemblies 5. At this time, the movable shaft 52 is pulled by using the hydraulic assembly 7, and the connecting hook 53 moves to the middle of the bottom of the mounting frame 4, that is, the connecting hook 53 moves to the lifting lug of the vessel head, and finally each connecting hook 53 hooks the corresponding lifting lug of the vessel head, so that the device can be connected to the vessel head. Conversely, when the nuclear reactor pressure vessel head is large, the lifting lug of the nuclear reactor pressure vessel head is located outside the plurality of connecting assemblies 5. At this time, the movable shaft 52 is pushed by using the hydraulic assembly 7, and the connecting hook 53 moves outward, so that the connecting hook 53 hooks the lifting lug of the vessel head, and the device can be connected to the vessel head. When the overall length of the connecting assembly 5 is insufficient, the movable shaft 52 will extend out of the sleeve 51 under the push of the hydraulic assembly 7, and finally each connecting hook 53 hooks the corresponding lifting lug of the vessel head, so that the device can be connected to the vessel head. When the nuclear reactor pressure vessel head is not directly below the mounting frame 4, that is, the length of the position of each lifting lug of the vessel head and the corresponding connecting hook 53 is different, the extension length of the output end of each hydraulic assembly 7 is adjusted to adjust the extension length of the different movable shafts 52 from the corresponding sleeves 51, so that the connecting hook 53 hooks the corresponding lifting lug of the vessel head. After lifting the vessel head, continue to adjust the hydraulic assembly 7, so that the extension length of the output end of each hydraulic assembly 7 is consistent, so that the vessel head can be moved to the mounting frame 4 directly below. When the vessel head is lifted above the vessel cylinder, it is convenient to further fine-tune the position of the vessel head.

[0040] In order to solve the problem that the existing lifting device is difficult to fine-tune the position of the vessel head, based on the design, after the vessel head is lifted above the vessel cylinder, the corresponding hydraulic assembly 7 is adjusted according to the deviation position of the vessel head on the vessel cylinder. Preferably, the hydraulic assembly 7 is provided with at least three hydraulic assemblies 7. The hydraulic assembly 7 can make the vessel head change position in the horizontal and vertical directions by pushing or pulling the corresponding movable shaft 52, and can make the vessel head be in a horizontal state after adjustment. Therefore, the device can realize fine adjustment of the position of the vessel head, and ensure that the vessel head is directly opposite the vessel cylinder. Based on the operation, the same can solve the problem that the uneven weight distribution of the vessel head itself causes the vessel head to be in an inclined state during lifting by the lifting device, and makes the vessel head inconvenient to align the vessel cylinder, and realizes the posture adjustment of the head.

[0041] In order to solve the problem that the size range of the container top cover hoisted by the existing hoisting device is limited and the use of the device is limited. Based on the device, the hydraulic assembly 7 pushes the movable shaft 52, and the connecting hooks 53 move outward, so that the connecting hooks 53 are far away from each other, and the container top cover of larger size can be hoisted. When the output end of the hydraulic assembly 7 is the longest, the device can also move the lifting seat 6 downward, so that the hydraulic assembly 7 pushes the movable shaft 52 out of the sleeve 51, which makes the connecting hooks 53 further away from each other to hook the lifting lugs of the container top cover of larger size. Therefore, the device can hoist the container top cover of larger size, and the size range of the container top cover hoisted by the device is larger.

[0042] In order to reduce the load on the single hydraulic assembly 7 and the connecting assembly 5, and avoid the hydraulic assembly 7 or the connecting assembly 5 being stressed too much, thereby improving the service life of the device. By adjusting the extension length of the output end of the hydraulic assembly 7, the deflection angle of the hydraulic assembly 7 can be adjusted, and the deflection angle of the sleeve 51 and the movable shaft 52 as a whole can be adjusted, so that the hydraulic assembly 7 and the connecting assembly 5 can bear the weight of the container top cover more evenly, and avoid one of the hydraulic assembly 7 or the connecting assembly 5 being stressed too much and causing damage or reducing the service life.

[0043] The moving platform 3 comprises slide rails 31, slide seats 32, slide tables 33, positioning seats 34, connecting seats 35, and fixed rods 36. Two slide rails 31 are fixedly arranged between the two lifting frames 2, and the two lifting frames 2 and the two slide rails 31 form a rectangular structure. The slide seats 32 are movably arranged above the two slide rails 31. The slide tables 33 are movably arranged on the inner side of the lower end of the slide seats 32. The positioning seats 34 are fixedly installed below the slide tables 33. The connecting seats 35 are fixedly installed below the positioning seats 34. The upper ends of the fixed rods 36 are fixedly installed on the bottom side of the connecting seats 35. The lower ends of the fixed rods 36 are fixedly installed on the upper edge of the mounting frame 4. The bottom side of the connecting seat 35 is uniformly and spacedly provided with a plurality of fixed rods 36.

[0044] Based on the design, the slide seats 32 slide on the two slide rails 31, and the slide tables 33 slide on the bottom of the slide seats 32 to hoist the container top cover above the container cylinder. The positioning seats 34 are connected with the fixed rods 36 through the connecting seats 35. The fixed rods 36 are not less than three. The fixed rods 36 and the connecting assembly 5 are the same in number and one-to-one correspondence. The fixed rods 36 are connected with the mounting frame 4. The connecting assembly 5 and the hydraulic assembly 7 pull the top cover. The device is not easy to shake during hoisting the top cover, which is conducive to ensuring the stability of the hoisting process, and solves the problems that the top cover is easy to shake during hoisting with a sling and a hook structure, and the top cover and the cylinder are not easy to align accurately.

[0045] The bottom of the connecting seat 35 is fixedly provided with a positioning pipe 8, the bottom of the positioning pipe 8 is fixedly connected with a mounting frame 4, the middle part of the mounting frame 4 is provided with a through hole 9, the inside of the connecting seat 35 and the positioning pipe 8 is fixedly provided with a first hydraulic rod 10, the output end of the first hydraulic rod 10 is arranged in the inside of the through hole 9, the output end of the first hydraulic rod 10 is fixedly installed with a connecting rod 11, the connecting rod 11 is fixedly connected with the lifting seat 6.

[0046] Based on the design, the output end of the first hydraulic rod 10 is located in the inside of the positioning pipe 8 and is matched with the positioning pipe 8, the output end of the first hydraulic rod 10 is fixed through the connecting rod 11 and the lifting seat 6, the output end of the first hydraulic rod 10 extends downward, that is, the position of the lifting seat 6 can be adjusted downward through the connecting rod 11, so as to realize the position adjustment of the vertical height of the lifting seat 6.

[0047] The connecting assembly 5 further comprises a sliding block 54 movably arranged above the inside of the sleeve 51, the sliding block 54 is fixedly installed above the movable shaft 52, the bottom of the sleeve 51 is fixedly provided with a cover 27, the movable shaft 52 is arranged in the inside of the cover 27, the side surface of the movable shaft 52 is sleeved with a spring 12, the bottom of the spring 12 abuts against the cover 27, and the upper end of the spring 12 abuts against the sliding block 54.

[0048] Based on the design, after the connecting hook 53 hooks the lifting lug of the container top cover, the movable shaft 52 and the sliding block 54 are pulled downward, and the spring 12 is compressed under stress. During the compression process of the spring 12, the sliding block 54 and the movable shaft 52 also generate a supporting force, which generates a pulling action on the movable shaft 52 and enables the movable shaft 52 to generate a pulling action on the container top cover. By changing the extension length of the output end of the hydraulic assembly 7, the extension length of the movable shaft 52 from the inside of the sleeve 51 can be changed, so that the position of the container top cover hooked by the connecting hook 53 can be adjusted. During the process, by adjusting the extension length of the output end of each hydraulic assembly 7, the position of the container top cover in the horizontal and vertical directions can be correspondingly changed, so as to realize the accurate adjustment of the position of the container top cover. By adjusting the extension length of the output end of each hydraulic assembly 7, the distance between the connecting hooks 53 can be adjusted, so that the device can hoist the container top cover of different sizes.

[0049] The inner wall of the sleeve 51 is fixedly provided with a limiting plate 16, the side surface of the sliding block 54 is provided with a limiting groove 17, the limiting plate 16 is just clamped in the inside of the limiting groove 17, and there is a gap between the limiting plate 16 and the inner wall of the limiting groove 17.

[0050] Based on the design, the limiting plate 16 and the limiting groove 17 are arranged to limit the sliding block 54, avoiding the rotation of the sliding block 54 in the sleeve 51. The gap between the inner walls of the limiting plate 16 and the limiting groove 17 allows the chambers above and below the sliding block 54 in the sleeve 51 to communicate when the sliding block 54 moves downward, so that the air pressure in the chambers above and below the sliding block 54 is consistent, avoiding pressure difference causing the sliding block 54 to move smoothly.

[0051] Wherein, the bottom edge of the mounting bracket 4 is fixedly provided with the first connecting plate 13, the upper end of the sleeve 51 is movably connected with the first connecting plate 13, the sleeve 51 rotates below the first connecting plate 13, the side of the lifting seat 6 is fixedly provided with a plurality of second connecting plates 14, the upper end of the hydraulic assembly 7 is movably connected with the second connecting plate 14, the hydraulic assembly 7 rotates on one side of the second connecting plate 14, the lower end of the movable shaft 52 is fixedly provided with the third connecting plate 15 on the side, the output end of the hydraulic assembly 7 is movably connected with the third connecting plate 15, and the output end of the hydraulic assembly 7 rotates on one side of the third connecting plate 15.

[0052] Wherein, the bottom of the movable shaft 52 is fixedly provided with the fixed frame 18, the inside of the fixed frame 18 is movably provided with the rotating plate 19, the bottom of the rotating plate 19 is fixedly provided with the spherical shell 20, the inside of the spherical shell 20 is movably provided with the ball head 21 below, and the connecting hook 53 is fixedly installed below the ball head 21.

[0053] Based on the design, when the movable shaft 52 is in a non-vertical state, the rotating plate 19 rotates at the bottom of the fixed frame 18, and the ball head 21 adaptively rolls below the inside of the spherical shell 20, so that the connecting hook 53 is always in a vertical state, avoiding the connecting hook 53 from being separated from the lifting lug of the container top cover. During lifting, the connecting hook 53 remains stable and vertical under the gravity of the container top cover.

[0054] Wherein, the inside of the upper end of the supporting leg 1 is fixedly provided with the second hydraulic rod 22, the top output end of the second hydraulic rod 22 is fixedly connected with the lifting frame 2, the bottom of the lifting frame 2 is fixedly provided with the guide shaft 23, the inside of the upper end of the supporting leg 1 is provided with the guide groove 24 matched with the guide shaft 23, and the guide shaft 23 slides in the guide groove 24.

[0055] Wherein, the upper end of the sealing cover 27 is fixedly provided with the first sealing ring 25, the outer wall of the first sealing ring 25 abuts against the inner wall of the bottom barrel of the sleeve 51, and the upper end of the sealing cover 27 is fixedly provided with the second sealing ring 26, and the inner wall of the second sealing ring 26 abuts against the side wall of the movable shaft 52.

[0056] Based on the design, the sealing performance of the inside of the sleeve 51 is improved, avoiding impurities from mixing into the inside and causing pollution.

[0057] Wherein, the inside of the sleeve 51 is filled with damping lubricating grease.

[0058] Based on the design, the damping lubricating grease plays a further sealing role between the inner and outer walls of the first sealing ring 25 and the second sealing ring 26. During the movement of the sliding block 54 in the sleeve 51, the damping lubricating grease is pressed to pass through the gap between the limiting plate 16 and the inner wall of the limiting groove 17, which hinders the movement of the sliding block 54, reduces the pressure of the spring 12 during the movement of the sliding block 54, and improves the service life of the spring 12. By using the damping lubricating grease to hinder the movement of the sliding block 54 and the movable shaft 52, when the movable shaft 52 is unstable due to hoisting, vibration or other factors, the short-term stress change of the movable shaft 52 is hindered, the unstable movement of the movable shaft 52 in a short time is hindered, the vibration or instability change is reduced, and the lifting and movement process of the device is more stable.

[0059] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of the specification. The specification selects and describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and use the application. The application is limited by the claims and their entire scope and equivalents.

Claims

1. A hoisting device for a nuclear reactor pressure vessel head, comprising a support leg (1), two lifting frames (2) movably arranged at the upper end of the support leg (1), and a moving platform (3) fixedly arranged between the two lifting frames (2), characterized in that: The lower part of the mobile platform (3) is fixedly provided with a mounting rack (4), a plurality of connecting assemblies (5) are uniformly and spacedly arranged on the bottom of the mounting rack (4), a lifting seat (6) is movably arranged in the middle of the bottom of the mounting rack (4), and a plurality of uniformly and spacedly distributed hydraulic assemblies (7) are movably arranged on the side of the lifting seat (6); the number of the hydraulic assemblies (7) is the same as that of the connecting assemblies (5) and they are one-to-one corresponding; The connecting assembly (5) comprises a sleeve (51) movably arranged on the edge of the bottom of the mounting rack (4), a movable shaft (52) elastically connected to the inside of the lower end of the sleeve (51), and a connecting hook (53); the lower end of the movable shaft (52) penetrates through the sleeve (51), the connecting hook (53) is movably arranged on the bottom of the movable shaft (52), and the output end of the hydraulic assembly (7) is movably connected with the movable shaft (52) in the corresponding connecting assembly (5); The connecting assembly (5) further comprises a sliding block (54) movably arranged on the inside of the sleeve (51), the sliding block (54) is fixedly arranged above the movable shaft (52), the bottom of the sleeve (51) is fixedly provided with a cover (27), the movable shaft (52) is arranged in the inside of the cover (27), a spring (12) is sleeved on the side of the movable shaft (52), the bottom of the spring (12) abuts against the cover (27), and the upper end of the spring (12) abuts against the sliding block (54); The inner wall of the sleeve (51) is fixedly provided with a limiting plate (16), the side of the sliding block (54) is provided with a limiting groove (17), the limiting plate (16) is just clamped in the inside of the limiting groove (17), and a gap is formed between the limiting plate (16) and the inner wall of the limiting groove (17).

2. The hoisting device for a nuclear reactor vessel head according to claim 1, characterized in that: The mobile platform (3) comprises slide rails (31), slide seats (32), slide tables (33), positioning seats (34), connecting seats (35) and fixing rods (36), two slide rails (31) are fixedly arranged between the two lifting frames (2), the two lifting frames (2) and the two slide rails (31) form a rectangular structure, the slide seats (32) are movably arranged above the two slide rails (31), the slide tables (33) are movably arranged on the inner side of the lower end of the slide seats (32), the positioning seats (34) are fixedly arranged below the slide tables (33), the connecting seats (35) are fixedly arranged below the positioning seats (34), the upper ends of the fixing rods (36) are fixedly arranged on the bottom side of the connecting seats (35), the lower ends of the fixing rods (36) are fixedly arranged on the upper edge of the mounting rack (4), and the bottom side of the connecting seat (35) is uniformly and spacedly provided with a plurality of fixing rods (36).

3. The hoisting device for a nuclear reactor vessel head according to claim 2, wherein: The bottom of the connecting seat (35) is fixedly provided with a positioning pipe (8), the bottom of the positioning pipe (8) is fixedly connected with a mounting frame (4), the middle part of the mounting frame (4) is provided with a through hole (9), the inside of the connecting seat (35) and the positioning pipe (8) is fixedly provided with a first hydraulic rod (10), the output end of the first hydraulic rod (10) penetrates the inside of the through hole (9), the output end of the first hydraulic rod (10) is fixedly installed with a connecting rod (11), the connecting rod (11) is fixedly connected with the lifting seat (6).

4. The hoisting device of a nuclear reactor pressure vessel head according to claim 1, characterized in that: The bottom edge of the mounting frame (4) is fixedly installed with a first connecting plate (13), the upper end of the sleeve (51) is movably connected with the first connecting plate (13), the sleeve (51) rotates below the first connecting plate (13), the side of the lifting seat (6) is fixedly installed with a plurality of second connecting plates (14), the upper end of the hydraulic assembly (7) is movably connected with the second connecting plate (14), the hydraulic assembly (7) rotates on one side of the second connecting plate (14), the lower end side of the movable shaft (52) is fixedly installed with a third connecting plate (15), the output end of the hydraulic assembly (7) is movably connected with the third connecting plate (15), the output end of the hydraulic assembly (7) rotates on one side of the third connecting plate (15).

5. The hoisting device of a nuclear reactor pressure vessel head according to claim 4, characterized in that: The bottom of the movable shaft (52) is fixedly installed with a fixing frame (18), the inside of the fixing frame (18) is movably provided with a rotating plate (19), the bottom of the rotating plate (19) is fixedly provided with a spherical shell (20), the inside of the spherical shell (20) is movably provided with a ball head (21) below, and the connecting hook (53) is fixedly installed below the ball head (21).

6. The hoisting device of a nuclear reactor vessel head according to claim 1, characterized in that: The inside of the upper end of the supporting leg (1) is fixedly provided with a second hydraulic rod (22), the top output end of the second hydraulic rod (22) is fixedly connected with the lifting frame (2), the bottom of the lifting frame (2) is fixedly provided with a guide shaft (23), the inside of the upper end of the supporting leg (1) is provided with a guide groove (24) matched with the guide shaft (23), and the guide shaft (23) slides in the inside of the guide groove (24).

7. The hoisting device of a nuclear reactor vessel head according to claim 1, characterized in that: The upper end outer wall of the cover (27) is fixedly provided with a first sealing ring (25), the outer wall of the first sealing ring (25) abuts against the bottom barrel opening inner wall of the sleeve (51), the upper end inner wall of the cover (27) is fixedly provided with a second sealing ring (26), and the inner wall of the second sealing ring (26) abuts against the side wall of the movable shaft (52).

8. The hoisting device of a nuclear reactor vessel head according to claim 7, characterized in that: The inside of the sleeve (51) is filled with damping lubricating grease.

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