A core guide column lifting device

Abstract

The present invention specifically relates to a core guide column lifting sling, comprising a gripping mechanism, a safety pin locking mechanism, and a personnel operating mechanism; the safety pin locking mechanism is sleeved within the gripping mechanism and, with the cooperation of a crane, slides up and down within the gripping mechanism and extends out of the gripping mechanism; the gripping mechanism is sleeved within the personnel operating mechanism and, with the cooperation of a crane, moves up and down within the personnel operating mechanism; the safety pin locking mechanism is movably connected to the personnel operating mechanism's latch pin, and the personnel operating mechanism limits the gripping mechanism's rotation and opening; with the cooperation of the personnel operating mechanism and the crane, the safety locking mechanism and the personnel operating mechanism are locked and released, as well as the gripping mechanism and the personnel operating mechanism are locked and released. The core guide column lifting sling of the present invention realizes automatic or remote manual gripping and release of the guide column, providing safety and reliability of the operation.

Description

Technical Field

[0001] The invention relates to the technical field of core guide column lifting, in particular to a core guide column lifting sling. Background Art

[0002] The core of a pressurized water reactor (PWR) consists of the pressure vessel and upper and lower internals. During refueling outages, the reactor pressure vessel head and internals must be hoisted. Due to the numerous mating parts and assembly interfaces between the pressure vessel and internals, high assembly precision is required. Furthermore, due to the high irradiation dose to the core, hoisting operations often require remote underwater operations. In light of these two considerations, three guide columns are used for guidance and positioning during the hoisting of the core's heavy components, achieving high assembly precision through the directional constraints provided by the guide columns.

[0003] The core guide column is a cylindrical structure, approximately 5.5 meters tall and weighing 390 kg. When not in use, it is stored on a rack in the refueling pool. When in use, it is hoisted using a ring crane and installed in the corresponding bolt holes on the pressure vessel flange. The core guide column is installed in the core and serves as a guide and positioning tool during the lifting of the core. During overhauls, a ring crane is required for hoisting, installation, and removal. This work requires personnel to climb a long ladder or ride in a hanging basket to the top of the guide column to install and remove the shackle. This is a high-altitude operation in the core pool, a high-dose, easily contaminated area, and poses a significant risk of falls and internal contamination.

[0004] During the lifting and use of the guide column, there are significant risks associated with connecting and disconnecting the lifting lugs. The guide column's lifting lugs are connected to the lifting equipment via shackles and slings. Due to the height of the guide column and the lack of other support components in the core, the current method of handling it requires climbing a long ladder or using a hanging basket.

[0005] When operating via a climbing ladder, the ladder is placed against the guide column, and the operator climbs the ladder to a point where the top of the guide column can be reached to perform installation and removal of the shackles. Because the ladder relies on the curved surface of the guide column, the point support is extremely unstable. The slightest deviation can cause the operator to lose their center of gravity and fall. Furthermore, if a person is injured in the core, internal contamination from damaged skin is very likely to occur. When operating via a hanging basket, the basket is suspended by a ring crane, and the operator rides in the basket and moves it to the upper end of the guide column via the ring crane to install and remove the lifting lugs and shackles. This operation is a Level 2 high-risk operation and requires a Level 2 high-risk operation plan for risk control. Summary of the Invention

[0006] Based on this, it is necessary to provide a core guide column lifting sling to address the above-mentioned problems existing in the existing core guide column lifting. The sling realizes a safety self-locking function through a mechanical mechanism, solves the problem of personnel climbing long ladders in the core area when disassembling and detaching buckles, avoids personnel from high-altitude climbing operations in the core area, realizes automatic or remote manual grasping and release of the guide column, eliminates the risk of personnel falling from high altitude, provides safety and reliability of operations, and at the same time, improves work efficiency and reduces radiation dose.

[0007] In order to solve the above problems, the present invention provides the following technical solutions:

[0008] A core guide column lifting device comprises a lower grabbing mechanism, an upper safety pin locking mechanism and a personnel operating mechanism;

[0009] The safety pin tightening mechanism is sleeved in the grabbing mechanism and slides up and down in the grabbing mechanism and extends out of the grabbing mechanism with the cooperation of the crane;

[0010] The grabbing mechanism is sleeved in the personnel operating mechanism and moves up and down in the personnel operating mechanism with the cooperation of the crane;

[0011] The safety pin tightening mechanism is movably connected to the latch of the personnel operating mechanism, and the personnel operating mechanism restricts the rotation and opening of the grabbing mechanism;

[0012] With the cooperation of the personnel operating mechanism and the crane, the locking and releasing of the safety locking mechanism and the personnel operating mechanism, as well as the locking and releasing of the grabbing mechanism and the personnel operating mechanism are realized.

[0013] Working principle: The spreader is lifted by a crane and moved smoothly to the top of the guide column. The spreader falls onto the gripping head of the guide column and automatically grabs the guide column. The operator operates the mechanism to release the locking state of the safety locking mechanism and the personnel operating mechanism. The safety locking mechanism slides out when the crane is lifted, and the spreader locks the gripping action. The spreader and the guide column cannot be disconnected during the entire movement process. When the guide column is hoisted to the specified position, the crane falls to a stress-free state, and the safety locking mechanism slides down in the gripping mechanism, releasing the locking state of the safety locking mechanism and the personnel operating mechanism. The operator operates the mechanism to release the rotation and opening restriction of the personnel operating mechanism on the gripping mechanism. The crane lifts, and the spreader is disconnected from the guide column.

[0014] Furthermore, the safety pin locking mechanism includes a lifting ear, a pressure block, a safety pin seat and a safety pin; the lower end of the lifting ear is inserted into the safety pin seat and fixedly connected to the safety pin seat, driving the safety pin seat to move up and down with the cooperation of the crane; the pressure block is sleeved on the safety pin seat and fixedly connected to the safety pin seat, moving up and down with the safety pin seat; the bottom of the safety pin seat is telescopically connected to the safety pin.

[0015] Furthermore, the lifting ear is connected to the safety pin seat via a fastener; the pressing block is connected to the safety pin seat via a fastener, and the bottom of the safety pin seat is connected to the safety pin via a movable pin shaft.

[0016] Furthermore, the gripping mechanism includes a fixed pulley, a cover plate, a safety pin housing, a connecting plate, a fixed seat and a gripper; the side of the cover plate is fixedly connected to the fixed pulley; the safety pin housing is a hollow structure, and a slide groove is provided in the safety pin housing for the safety pin to slide up and down with the cooperation of the crane; the cover plate is sleeved on the safety pin seat and fixedly connected to the safety pin seat, and the lower end face of the cover plate is fixedly connected to the safety pin housing, the connecting plate and the upper end face of the fixed seat in turn by fasteners, the cover plate is below the pressure block, and the bottom of the fixed seat is telescopically connected to the gripper.

[0017] Furthermore, the side of the cover plate is connected to the fixed pulley via fasteners; the cover plate is connected to the safety pin seat via fasteners, and is sequentially connected to the safety pin housing, the connecting plate and the fixing seat via fasteners.

[0018] Furthermore, the personnel operating mechanism includes a pull rope and a locking sleeve; the locking sleeve is a hollow structure, and the safety pin housing, connecting plate and fixing seat are all sleeved in the locking sleeve and move up and down in the locking sleeve with the cooperation of the crane; the safety pin extends out of the safety pin housing and is connected to the movable bayonet of the locking sleeve; the pull rope is connected and fixed to the locking sleeve, and hangs down to the ground after passing through the cover plate and the fixed pulley.

[0019] Furthermore, a slot matching the safety pin is provided in the locking sleeve, and the safety pin extends out of the safety pin housing and is clamped by the slot of the locking sleeve.

[0020] Furthermore, the gripper matches the conical end surface of the core guide column gripper.

[0021] Beneficial technical effects of the present invention:

[0022] The core guide column lifting sling of the present invention can realize the long-distance grasping and releasing of the sling and the locking of the claw action, thereby ensuring the safety and reliability of the operation of the personnel installing the guide column sling and always ensuring the safe connection of the guide column during the lifting process, solving the problem of personnel climbing long ladders in the core area when disassembling and detaching buckles, avoiding personnel high-altitude climbing operations in the core area, realizing automatic or remote manual grasping and releasing of the guide column, eliminating the risk of personnel falling from high altitude, providing safety and reliability of the operation, and at the same time, improving work efficiency and reducing radiation dose. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a core guide column lifting device according to the present invention;

[0024] Figure 2This is a cross-sectional view of the core guide column lifting device of the present invention with the claws opened and the safety pin locked;

[0025] Figure 3 This is a cross-sectional view of the core guide column lifting device of the present invention when it is falling and pulling the rope;

[0026] Figure 4 This is a cross-sectional view of the core guide column lifting device of the present invention in a non-lifting state with the gripping head engaged;

[0027] Figure 5 This is a cross-sectional view of the core guide column lifting sling of the present invention in the state of lifting and locking the claw grabbing the safety pin.

[0028] In the figure, 1. lifting ear; 2. pressure block; 3. fixed pulley; 4. cover plate; 5. safety pin seat; 6. safety pin; 7. safety pin housing; 8. connecting plate; 9. pull rope; 10. locking sleeve; 11. fixing seat; 12. claw; 13. grab head; 14. guide column. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be understood that the terms "left end", "right end", "above", "below", "outside", "inside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0030] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] See also Figure 1-5 , the present invention provides a core guide column lifting sling, comprising a lower grabbing mechanism, an upper safety pin locking mechanism and a personnel operating mechanism;

[0033] The safety pin tightening mechanism is sleeved in the grabbing mechanism and slides up and down in the grabbing mechanism and extends out of the grabbing mechanism with the cooperation of the crane;

[0034] The grabbing mechanism is sleeved in the personnel operating mechanism and moves up and down in the personnel operating mechanism with the cooperation of the crane;

[0035] The safety pin tightening mechanism is movably connected to the latch of the personnel operating mechanism, and the personnel operating mechanism restricts the rotation and opening of the grabbing mechanism;

[0036] With the cooperation of the personnel operating mechanism and the crane, the locking and releasing of the safety locking mechanism and the personnel operating mechanism, as well as the locking and releasing of the grabbing mechanism and the personnel operating mechanism are realized.

[0037] The sling is lifted by a crane and smoothly moved to the top of the guide column. The sling falls onto the guide column gripping head and automatically grips the guide column. The operator operates the mechanism to release the locking state of the safety locking mechanism and the personnel operating mechanism. The crane lifts the safety locking mechanism to slide out, and the sling locks the gripping action. The sling and the guide column cannot be disconnected during the entire movement process. When the guide column is hoisted to a specified position, the crane falls to a stress-free state, and the safety locking mechanism slides down in the gripping mechanism to release the locking state of the safety locking mechanism and the personnel operating mechanism. The operator operates the mechanism to release the rotation and opening restriction of the gripping mechanism by the personnel operating mechanism. The crane lifts and the sling is disconnected from the guide column. The present invention takes into account the safety self-locking during the connection and disconnection of the sling and the guide column during the entire lifting process. During the lifting process, the sling and the guide column are required to be locked and cannot be disconnected. After the lifting and fixing is completed, the safety locking mechanism is required to release the locking, and the sling is disconnected from the guide column. The safety locking mechanism realizes the switching and triggering of the two states under the cooperation of the personnel operating mechanism and the crane.

[0038] Furthermore, the safety pin locking mechanism comprises a lifting lug 1, a pressing block 2, a safety pin seat 5 and a safety pin 6;

[0039] The lower end of the lifting ear 1 is inserted into the safety pin seat 5 and connected to the safety pin seat 5 through a fastener, and drives the safety pin seat 5 to move up and down with the cooperation of the crane;

[0040] The pressing block 2 is sleeved on the safety pin seat 5 and connected to the safety pin seat 5 through a fastener, and moves up and down with the safety pin seat 5;

[0041] The bottom of the safety pin seat 5 is connected to the safety pin 6 through a movable pin shaft;

[0042] The safety pin locking mechanism relies on the deadweight of the pressure block 2 to move up and down with the cooperation of the crane to achieve locking and releasing of the safety pin 6 and the locking sleeve 10.

[0043] Furthermore, the grabbing mechanism includes a fixed pulley 3, a cover plate 4, a safety pin housing 7, a connecting plate 8, a fixing seat 11 and a grab claw 12;

[0044] The side of the cover plate 4 is connected to the fixed pulley 3 via a fastener;

[0045] The safety pin housing 7 is a hollow structure, and a slide groove is provided in the safety pin housing 7 for the safety pin 6 to slide up and down under the cooperation of the crane;

[0046] The cover plate 4 is sleeved on the safety pin seat 5 and connected to the safety pin seat 5 through fasteners, the lower end surface of the cover plate 4 is connected to the upper end surface of the safety pin housing 7 through fasteners, the lower end surface of the safety pin housing 7 is connected to the upper end surface of the connecting plate 8 through fasteners, the lower end surface of the connecting plate 8 is connected to the upper end surface of the fixing seat 11 through fasteners, the cover plate 4 is below the pressure block 2, and the fixing seat 11 and the gripper 12 are connected by a movable pin shaft.

[0047] Furthermore, the personnel operating mechanism includes a pull rope 9 and a locking sleeve 10;

[0048] The locking sleeve 10 is a hollow structure, and a slot matching the safety pin 6 is provided in the locking sleeve 10. The safety pin housing 7, the connecting plate 8 and the fixing seat 11 are all sleeved in the locking sleeve 10 and move up and down in the locking sleeve 10 with the cooperation of the crane.

[0049] The safety pin 6 extends out of the safety pin housing 7 and is clamped by the slot of the locking sleeve 10;

[0050] The pull rope 9 is connected and fixed to the locking sleeve 10, passes through the cover plate 4 and the fixed pulley 3, and then hangs down to the ground, which is convenient for personnel to operate.

[0051] A gripping head 13 is installed at the upper end of the guide column 14. The gripping head 13 is installed once and does not need to be disassembled. When the crane moves, the spreader approaches the gripping head 13. The spreader and the gripping head 13 have a tapered guide. The spreader contacts the gripping head 13 through the guide. During the descent of the spreader, the conical surface of the gripping head 13 acts on the four claws 12. When the conical surfaces fit together, the claws 12 hook the lower part of the gripping head 13 through rotation. The locking sleeve 10 falls to limit the rotation and opening of the claws 12, thereby realizing remote gripping.

[0052] The method of lifting a core guide column using the core guide column lifting device of the present invention comprises the following steps:

[0053] 1. Original state of the sling: the safety pin 6 extends out of the safety pin housing 7 and is clamped by the locking sleeve 10, the claw 12 extends out of the locking sleeve 10 and is in a semi-open state, and the pull rope 9 is loosened.

[0054] 2. Clamping of lifting claws: The sling is introduced into the cone head, and the lifting ring is not subject to the pulling force of the vehicle. At this time, the pull rope 9 is pulled, the locking sleeve 10 moves up, the safety pin 6 is disengaged from the locking sleeve 10, the lifting ring moves down, the pull rope 9 is released, the locking sleeve 10 slides down, the safety pin 6 is stuck in the locking sleeve 10 again, and the claw 12 enters the clamping state and is locked.

[0055] 3. Lifting and movement: The crane pulls the lifting ring upward, and the safety pin 6 extends out of the safety pin housing 7. At this time, the pull rope 9 can no longer pull the locking sleeve 10 upward; the crane continues to move upward, and the guide column 14 is lifted, which can complete the required movement and the sling completes the long-distance grabbing.

[0056] 4. Hoisting into place: The lower end of the guide column 14 is fixed. At this time, the lifting ring is not subjected to the driving tension. The safety locking mechanism slides into place under the gravity of the pressure block 2. The safety pin seat 5 drives the safety pin 6 to slide downward in the guide groove of the safety pin housing 7 to a position where it does not interfere with the locking sleeve 10.

[0057] 5. Release the claw of the spreader: Pull the draw rope 9, the locking sleeve 10 moves upward, the claw 12 extends out of the locking sleeve 10 and rotates open, and the connection between the claw 12 and the gripping head 13 is released.

[0058] 6. Spreader detachment: When the crane drives the lifting ring to move up 10-20m, it drives the safety pin 6 to extend out of the safety pin housing 7 and clamp the locking sleeve 10, blocking the downward movement of the locking sleeve 10, loosening the pull rope 9, and the spreader enters the lifted state, completing the long-distance spreader release.

[0059] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A core guide column lifting sling, characterized in that: It includes a lower grabbing mechanism, an upper safety pin locking mechanism and a personnel operating mechanism; the safety pin locking mechanism is sleeved in the grabbing mechanism, and slides up and down in the grabbing mechanism and extends out of the grabbing mechanism with the cooperation of the crane; the grabbing mechanism is sleeved in the personnel operating mechanism, and moves up and down in the personnel operating mechanism with the cooperation of the crane; the safety pin locking mechanism is movably connected to the personnel operating mechanism's latch pin, and the personnel operating mechanism limits the rotation and opening of the grabbing mechanism; with the cooperation of the personnel operating mechanism and the crane, the locking and unlocking of the safety locking mechanism and the personnel operating mechanism are realized. The invention relates to a method for locking and releasing a grabbing mechanism and a personnel operating mechanism; the safety pin locking mechanism comprises a lifting lug (1), a pressure block (2), a safety pin seat (5) and a safety pin (6); the lower end of the lifting lug (1) is inserted into the safety pin seat (5) and is fixedly connected to the safety pin seat (5), and drives the safety pin seat (5) to move up and down with the cooperation of a crane; the pressure block (2) is sleeved on the safety pin seat (5) and is fixedly connected to the safety pin seat (5), and moves up and down with the safety pin seat (5); the bottom of the safety pin seat (5) is telescopically connected to the safety pin (6).

2. The core guide column lifting sling according to claim 1, characterized in that: The lifting lug (1) is connected to the safety pin seat (5) via a fastener; the pressing block (2) is connected to the safety pin seat (5) via a fastener.

3. The core guide column lifting sling according to claim 1, characterized in that: The bottom of the safety pin seat (5) is connected to the safety pin (6) via a movable pin shaft.

4. The core guide column lifting sling according to claim 1, characterized in that: The grabbing mechanism comprises a fixed pulley (3), a cover plate (4), a safety pin housing (7), a connecting plate (8), a fixing seat (11) and a claw (12); the side of the cover plate (4) is fixedly connected to the fixed pulley (3); the safety pin housing (7) is a hollow structure, and a slide groove is provided in the safety pin housing (7) for the safety pin (6) to slide up and down under the cooperation of the crane; the cover plate (4) is sleeved on the safety pin seat (5) and fixedly connected to the safety pin seat (5), the lower end surface of the cover plate (4) is fixedly connected to the safety pin housing (7), the connecting plate (8) and the upper end surface of the fixing seat (11) in turn through fasteners, the cover plate (4) is below the pressing block (2), and the bottom of the fixing seat (11) is telescopically connected to the claw (12).

5. The core guide column lifting sling according to claim 4, characterized in that: The side surface of the cover plate (4) is connected to the fixed pulley (3) via a fastener.

6. The core guide column lifting sling according to claim 4, characterized in that: The cover plate (4) is connected to the safety pin seat (5) via fasteners, and is sequentially connected to the safety pin housing (7), the connecting plate (8) and the fixing seat (11) via fasteners.

7. The core guide column lifting sling according to claim 4, characterized in that: The claw (12) matches the conical end surface of the core guide column gripper (13).

8. The core guide column lifting sling according to claim 4, characterized in that: The personnel operating mechanism includes a pull rope (9) and a locking sleeve (10); the locking sleeve (10) is a hollow structure, and the safety pin housing (7), the connecting plate (8) and the fixing seat (11) are all sleeved in the locking sleeve (10) and move up and down in the locking sleeve (10) with the cooperation of the crane; the safety pin (6) extends out of the safety pin housing (7) and is connected to the movable latch of the locking sleeve (10); the pull rope (9) is connected and fixed to the locking sleeve (10), and passes through the cover plate (4) and the fixed pulley (3) and then hangs down to the ground.

9. The core guide column lifting device according to claim 8, characterized in that: A slot matching the safety pin (6) is provided in the locking sleeve (10); the safety pin (6) extends out of the safety pin housing (7) and is clamped by the slot of the locking sleeve (10).

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