A hoist for a reactor movable component and a hoisting method

Abstract

The present invention belongs to the technical field of nuclear power plant reactor maintenance, and particularly relates to a lifting tool and a lifting method for a reactor moving component. The lifting tool includes a cylindrical clamping jaw, a support flange, an annular boss, a support block, a lifting pin, a nut, a rib plate, a load-bearing shaft and a cap; wherein the lifting pin is fixedly connected through the nut and the rib plate, the load-bearing shaft passes through the through hole inside the top of the cap and the through hole inside the center of the rib plate, and is fixedly connected with the rib plate, and the cap is fixedly connected with the cylindrical clamping jaw; the cylindrical clamping jaw and the support flange are connected through the support block, and an annular boss is arranged on the inner surface of the middle part of the cylindrical clamping jaw. The present invention solves the problems and potential hazards existing in the use of the existing lifting tool, improves the convenience and reliability of the connection of the moving component lifting tool, and avoids industrial safety and human error incidents during the operation process.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant reactor maintenance, and particularly relates to a lifting tool for reactor moving components and a lifting method thereof. Background Art

[0002] When the reactor unit is disassembled and overhauled, important work such as unsealing, removing, inspecting and maintaining, in-service inspecting, reinstalling and sealing all moving components needs to be carried out. For the removal or reinstallation of the moving components, a lifting tool for the moving components is required to lift the moving components from the upper components stored in the upper component inspection well to the special storage grid for the moving components in the reactor internal structure inspection well or to lift them back from the storage grid to the upper components. For the inspection, maintenance and in-service inspection of the moving components, a lifting tool for the moving components is required to lift the moving components and integrally inspect the sealing surface, weld seams, appearance, key dimensions, flexibility of rotating components, etc. of the moving components from top to bottom in a special maintenance hole. All the above-mentioned maintenance work related to the moving components requires the use of a lifting tool for the moving components, and the frequency of use of the lifting tool is extremely high. The elevation drop of the moving component lifting is large, the rotation coverage range of the crane is large and the up-and-down movement is frequent. Therefore, large-amplitude swinging will inevitably occur during the lifting process. Such frequent lifting work has high requirements for the installation convenience, connection reliability and durability of the lifting tool for the moving components. The working principle of the existing lifting tool for the moving components is as follows: by rotating the locking nut counterclockwise with the handle, it moves upward on the threaded pull rod until the three clamping claws open outward to an appropriate angle; the whole lifting tool is placed on the head of the moving component, and the positioning end cover of the lifting tool sits on the head of the moving component. At this time, the ends of the clamping claws of the lifting tool are aligned with the lifting grooves of the moving component; by rotating the locking nut clockwise with the handle, it moves downward, and the locking nut gradually locks the clamping claws, and the ends of the clamping claws hook the grooves on the head of the moving component to realize the connection between the lifting tool and the moving component; the sling connects the lifting lug and the crane hook to lift the moving component.

[0003] The existing lifting tool for the moving components has the following problems or potential hazards during use: The design of the special storage grid for the moving components has multiple storage cylinders for storing multiple moving components. The interval between adjacent storage cylinders is small. Therefore, when connecting (or removing) the lifting tool for the moving components in the storage cylinder, the handle of the lifting tool is blocked by the adjacent storage cylinder, and it is difficult to connect (or remove) the lifting tool; when connecting the lifting tool for the moving components in the storage cylinder, the whole clamping claw part of the lifting tool extends into the storage cylinder, and it is impossible to confirm whether the lifting tool is reliably connected to the moving component by visual inspection or other effective methods, which is prone to human error; there is a weak part in the clamping claw of the existing lifting tool for the moving components, and the cross-sectional area at this position is small. It is found on site that during the long-term use of the lifting tool, deformation will occur at this weak position, and the clamping claw will open outward at this position, posing a safety hazard of unreliable connection between the lifting tool and the moving component.

[0004] Therefore, it is necessary to provide a lifting tool for reactor moving components and a lifting method thereof to solve the problems and potential hazards existing in the existing lifting tool for the moving components and improve the connection convenience and reliability of the lifting tool for the moving components. Summary of the Invention

[0005] The object of the present invention is to provide a lifting tool and a lifting method for a reactor movable component in view of the deficiencies of the above-mentioned prior art, to solve the problems and potential hazards existing in the use of existing lifting tools, to improve the convenience and reliability of the connection of the movable component lifting tool, and to avoid industrial safety and human error incidents during the operation process.

[0006] The technical solution of the present invention is as follows:

[0007] A lifting tool for a reactor movable component, the lifting tool includes a cylindrical clamping jaw, a support flange, an annular boss, a support block, a lifting pin, a nut, a rib plate, a load-bearing shaft and a cap; wherein the lifting pin is fixedly connected through the nut and the rib plate, the load-bearing shaft passes through the through hole inside the top of the cap and the through hole inside the center of the rib plate, and is fixedly connected with the rib plate, and the cap and the cylindrical clamping jaw are fixedly connected; the cylindrical clamping jaw and the support flange are connected through the support block, and an annular boss is arranged on the inner surface of the middle part of the cylindrical clamping jaw.

[0008] The cylindrical clamping jaw has two petals, and two semi-circular holes are arranged at the top.

[0009] "J"-shaped key grooves are symmetrically arranged at both ends of the top of the cylindrical clamping jaw, and the notch of the "J"-shaped key groove is chamfered.

[0010] Upper and lower observation ports are respectively arranged on the cylindrical clamping jaw.

[0011] The lower end surface of the annular boss is in a slope shape.

[0012] The support block is a cuboid, and a through hole is opened at the lower end. A groove matching with the support block is opened on the upper part of the support flange. The support block is placed in the groove. A through hole corresponding to the through hole of the support block is opened on the support flange. A pin shaft passes through the through holes at the lower ends of the support flange and the support block, and is welded to the support flange.

[0013] The lower end surface of the support block is arc-shaped.

[0014] A positioning boss is arranged at the top of the outer side of the groove on the support flange.

[0015] The lifting pin passes through the round hole at the upper part of the rib plate and is fixedly connected through the nut.

[0016] The lower part of the load-bearing shaft is of a rectangular structure, and a groove matching with the rectangular structure at the lower part of the load-bearing shaft is arranged on the inner surface of the top of the cap. The lower part of the load-bearing shaft is clamped in the groove to ensure that the load-bearing shaft and the cap do not rotate relative to each other.

[0017] Two sector keys are symmetrically arranged on the inner surfaces at both ends of the bottom of the cap.

[0018] The "J"-shaped key groove of the cylindrical clamping jaw is connected with the sector key of the cap in a matching manner.

[0019] A hoisting method for a reactor moving component hoist, the method comprising the following steps:

[0020] Step (1): Grasp the semi-circular hole part at the top of the cylindrical clamping jaw with both hands, open the two halves of the cylindrical clamping jaw outward until the support block contacts the positioning boss, align the support flange with the head of the moving component, and lower the load-bearing cylinder;

[0021] Step (2): Close the two halves of the cylindrical clamping jaw, align the sector key with the notch of the "J"-shaped keyway and rotate it clockwise to the end;

[0022] Step (3): Pass the sling through the hoisting pin and hang it on the hook of the jib crane, and hoist the hook of the jib crane until the moving component is completely lifted out of the moving component storage cylinder.

[0023] The present invention has the following beneficial effects:

[0024] (1) The present invention avoids the existing hoist from tightening (or opening) the clamping jaw by means of thread rotation, and adopts the method of manually closing the two halves of the cylindrical clamping jaw and then locking the opening with a cap, effectively saving space and not interfering with other on-site equipment;

[0025] (2) The connection between the sector key and the "J"-shaped keyway of the present invention is simple and convenient, saving time and effort compared with thread rotation; the connection between the "J"-shaped keyway and the sector key has extremely high reliability, and it can be simply and clearly judged whether the lifting beam is reliably connected to the load-bearing cylinder through the waterproof marking line on the outer surface of the cylindrical clamping jaw;

[0026] (3) The present invention is provided with two locking and fixing points, namely the bottom positioning flange and the top lifting beam cap. Compared with the existing hoist, the connection between the hoist and the moving component is more reliable, effectively avoiding human error events;

[0027] (4) The main load-bearing part of the present invention is symmetric left and right, and there is no obvious difference in the cross-sectional area up and down, and it is not easy to deform after long-term use;

[0028] (5) The present invention is provided with a semi-circular hole, an upper observation port and a lower observation port, which effectively reduces the weight of the hoist on the basis of not affecting the overall strength and load-bearing capacity of the hoist, facilitating the disassembly, assembly and handling by the staff;

[0029] (6) The present invention is provided with a positioning boss on the positioning flange, and the position of the boss is designed according to the maximum opening angle limit value of the cylindrical clamping jaw in the moving component storage cylinder, which limits the opening angle of the cylindrical clamping jaw, enables the load-bearing cylinder to be smoothly installed on the head of the moving component, and will not scratch or collide with the wall of the storage cylinder at the same time. Brief Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of a moving component hoist provided by the present invention;

[0031] Figure 2 is a sectional view taken along line A-A of a lifting tool for a moving component provided by the present invention;

[0032] Figure 3 is a sectional view taken along line B-B of a lifting tool for a moving component provided by the present invention;

[0033] Figure 4 is an assembly drawing of the use of a lifting tool for a moving component provided by the present invention;

[0034] In the figure: 1 - cylindrical clamping jaw; 2 - support flange; 3 - pin shaft; 4 - semi-circular hole; 5 - keyway; 6 - upper observation port; 7 - annular boss; 8 - lower observation port; 9 - support block; 10 - positioning boss; 11 - lifting pin; 12 - nut; 13 - rib plate; 14 - load-bearing shaft; 15 - cap; 16 - sector key; 17 - head of the moving component; 18 - storage cylinder of the moving component; 19 - sling; 20 - hook of the jib crane. Detailed implementation manners

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0036] As Figure 1 , Figure 2 and Figure 3 shown, a lifting tool for a reactor moving component provided by the present invention includes a cylindrical clamping jaw 1, a support flange 2, a pin shaft 3, a semi-circular hole 4, a keyway 5, an upper observation port 6, an annular boss 7, a lower observation port 8, a support block 9, a positioning boss 10, a lifting pin 11, a nut 12, a rib plate 13, a load-bearing shaft 14, a cap 15 and a sector key 16.

[0037] The lifting pin 11 passes horizontally through the circular hole of the rib plate 13 and is fixedly connected with a nut 12. The combination of the lifting pin 11, the nut 12 and the rib plate 13 forms the lifting lug of the entire lifting tool for the moving component. The load-bearing shaft 14 passes through the through hole at the top of the cap 15 and the through hole inside the center of the rib plate 13, and is fixedly welded to the rib plate 13. The lower part of the load-bearing shaft 14 is of a rectangular structure, and the inner surface of the top of the cap 15 is provided with a groove that matches the rectangular structure of the lower part of the load-bearing shaft 14. The rectangular structure of the lower part of the load-bearing shaft 14 is engaged in the groove to ensure that the load-bearing shaft (14) and the cap (15) do not rotate relative to each other. Two sector keys 16 are symmetrically provided on the inner surfaces at both ends of the bottom of the cap 15.

[0038] The cylindrical clamping jaw 1 has two petals, and the two petals together form a complete cylinder. Each cylindrical clamping jaw 1 is provided with a semi-circular hole 4 at the top, which provides a grasping place for the installation or removal of the cylindrical clamping jaw 1 and serves as a state observation port for the head 17 of the moving component at the same time. In addition, on the basis of not affecting the overall strength and load-bearing capacity of the lifting tool, the semi-circular hole 4 effectively reduces the weight of the lifting tool, facilitating the disassembly, assembly and handling by the staff.

[0039] At both upper ends of the upper part of the cylindrical clamping claw 1, "J"-shaped key grooves 5 are symmetrically provided, which are fitted and installed with the sector keys 16 on the cap 15 to achieve reliable connection between the hanging beam and the load-bearing cylinder. The key grooves 5 with a "J"-shaped structure have the characteristics of convenient and reliable connection, and it can be judged whether the connection is in place through visual inspection or simple marking, which can effectively avoid human errors. Chamfering is done at the notch of the "J"-shaped key groove 5 to facilitate the centering and installation of the sector key 16 with the notch.

[0040] The cylindrical clamping claw 1 is provided with an upper observation port 6 and a lower observation port 8, which can effectively reduce the weight of the lifting tool on the basis of not affecting the overall strength and load-bearing capacity of the lifting tool, and is convenient for the staff to disassemble, assemble and carry.

[0041] There is an annular boss 7 on the inner surface of the cylindrical clamping claw 1. When the moving component is hoisted, the annular boss 7 is engaged in the middle groove of the head 17 of the moving component. The lower end surface of the annular boss 7 and the inner surface of the cylindrical clamping claw 1 are in a slope, making the installation process smoother. When connecting or removing the moving component lifting tool in the moving component storage cylinder 18, the staff can effectively check the relative position of the annular boss 7 and the lifting point of the head 17 of the moving component through the upper observation port 6, which is an important basis for judging the reliable connection between the cylindrical clamping claw 1 and the moving component.

[0042] A support block 9 is welded to the lower end of the cylindrical clamping claw 1. The support block 9 is a cuboid with a through hole at the lower end. A groove matching with the support block 9 is opened on the upper surface of the support flange 2. The support block 9 is placed in the groove to realize the connection between the support flange 2 and the cylindrical clamping claw 1. Through holes corresponding to the through holes of the support block 9 are opened on the support flange 2. The pin shaft 3 passes through the through holes at the lower ends of the support flange 2 and the support block 9 and is welded to the support flange 2. The lower end surface of the support block 9 is arc-shaped, so that the support block 9 can rotate on the pin shaft 3 to realize the opening and closing of the cylindrical clamping claw 1.

[0043] A positioning boss 10 is provided at the top outside the groove of the support flange 2. The positioning boss 10 limits the opening angle of the cylindrical clamping claw 1, so that the cylindrical clamping claw 1 can be smoothly installed on the head 17 of the moving component, and at the same time, it will not be scratched or knocked against the moving component storage cylinder 18.

[0044] The cylindrical clamping claw 1 and the support flange 2 constitute the load-bearing cylinder part of the moving component lifting tool.

[0045] The present invention has many advantages. In the moving component lifting tool, the connection between the sector key 16 and the "J"-shaped key groove 5 is simple and convenient. There are two locking and fixing points for the bottom support flange 2 and the cap 15. Compared with the previous lifting tools, the connection is more reliable, effectively avoiding human error events. The moving component lifting tool is mainly stressed and loaded by the annular boss 7 and the above parts. This part is symmetrical left and right and is not easy to deform during long-term use.

[0046] Such asFigure 4 As shown in the figure, the present invention also provides a hoisting method for a hoisting tool of a reactor moving component, and the method includes the following steps:

[0047] Step (1): Grasp the top semi-circular hole 4 of the cylindrical gripper 1 with both hands, open the two-lobe cylindrical gripper 1 outward until the support block 9 contacts the positioning boss 10, align the support flange 2 with the head 17 of the moving component, and lower the load-bearing cylinder.

[0048] Step (2): Close the two-lobe cylindrical gripper 1, check the relative position of the annular boss 7 and the lifting point of the head 17 of the moving component through the upper observation port 6, align the sector key 16 with the notch of the "J"-shaped keyway 5 and rotate it clockwise to the end.

[0049] Step (3): Pass the sling 19 through the hoisting pin 11 and then hang it on the hook 20 of the on-site cantilever crane, and lift the hook 20 of the cantilever crane until the moving component is completely lifted out of the moving component storage cylinder 18.

[0050] The present invention solves the problems and potential hazards existing in the previous hoisting tools, improves the convenience and reliability of the connection of the hoisting tool for the moving component, and effectively avoids industrial safety and human error events during the operation process. This project can be popularized and applied in the relevant work of the same type of units.

[0051] The present invention has been described in detail above in combination with the embodiments, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. The content not described in detail in the present invention can all adopt the prior art.

Claims

1. A lifting tool for reactor moving components, characterized in that: The lifting tool includes a cylindrical clamping jaw (1), a support flange (2), an annular boss (7), a support block (9), a lifting pin (11), a nut (12), a rib plate (13), a load-bearing shaft (14) and a cap (15); wherein the lifting pin (11) is fixedly connected through the nut (12) and the rib plate (13), the load-bearing shaft (14) passes through the through hole inside the top of the cap (15) and the through hole inside the center of the rib plate (13), and is fixedly connected to the rib plate (13), and the cap (15) is fixedly connected to the cylindrical clamping jaw (1); The cylindrical clamping jaw (1) and the support flange (2) are connected by a support block (9) and a pin shaft (3), and an annular boss (7) is arranged on the inner surface of the middle part of the cylindrical clamping jaw (1); The working mechanism of the lifting tool is that two semi-cylindrical clamping jaws (1) rotate around the pin shaft (3) at their lower ends to realize opening and closing. After the two semi-cylindrical clamping jaws (1) hold the moving component, the upper opening is locked by the cap (15), thereby realizing the lifting of the moving component.

2. A lifting tool for reactor moving components according to claim 1, characterized in that: The cylindrical clamping jaw (1) has two semi-cylindrical parts and is provided with two semi-circular holes (4) at the top.

3. A lifting tool for reactor moving components according to claim 2, characterized in that: "J"-shaped key grooves (5) are symmetrically arranged at both ends of the top of the cylindrical clamping jaw (1), and the notch of the "J"-shaped key groove (5) is chamfered.

4. A lifting tool for reactor moving components according to claim 3, characterized in that: Upper observation ports (6) and lower observation ports (8) are respectively arranged on the cylindrical clamping jaw (1).

5. A lifting tool for reactor moving components according to claim 4, characterized in that: The lower end surface of the annular boss (7) is in a slope shape.

6. A lifting tool for reactor moving components according to claim 5, characterized in that: The support block (9) is a cuboid, with a through hole opened at the lower end. A groove matching with the support block (9) is opened at the upper part of the support flange (2). The support block (9) is placed in the groove. A through hole corresponding to the through hole of the support block (9) is opened on the support flange (2). The pin shaft (3) passes through the through holes at the lower ends of the support flange (2) and the support block (9), and is welded to the support flange (2).

7. A lifting tool for reactor moving components according to claim 6, characterized in that: The lower end surface of the support block (9) is arc-shaped.

8. A lifting tool for reactor moving components according to claim 7, characterized in that: A positioning boss (10) is arranged at the top outside the groove on the support flange (2).

9. A lifting tool for reactor moving components according to claim 8, characterized in that: The lifting pin (11) passes through the round hole at the upper part of the rib plate (13) and is fixedly connected through the nut (12).

10. A lifting tool for reactor moving components according to claim 9, characterized in that: The lower part of the load-bearing shaft (14) is of a rectangular structure. The inner surface of the top of the cap (15) is provided with a groove that matches the rectangular structure of the lower part of the load-bearing shaft (14). The lower part of the load-bearing shaft (14) is clamped in the groove to ensure that the load-bearing shaft (14) and the cap (15) do not rotate relative to each other.

11. A lifting tool for a reactor moving assembly according to claim 10, characterized in that: Two sector keys (16) are symmetrically provided on the inner surfaces at both ends of the bottom of the cap (15).

12. A lifting tool for a reactor moving assembly according to claim 11, characterized in that: The "J"-shaped keyway (5) of the tubular gripper (1) is connected in cooperation with the sector key (16) of the cap (15).

13. A lifting method for a lifting tool for a reactor moving assembly according to any one of claims 1 to 12, characterized in that the method comprises the following steps: Step (1): Grasp the top semi-circular hole (4) part of the tubular gripper (1) with both hands, open the two halves of the tubular gripper (1) outward until the support block (9) contacts the positioning boss (10), align the support flange (2) with the head (17) of the moving assembly, and lower the load-bearing cylinder body; Step (2): Close the two halves of the tubular gripper (1), align the sector key (16) with the notch of the "J"-shaped keyway (5) and rotate it clockwise to the end; Step (3): Pass the sling (19) through the lifting pin (11) and then hang it on the hook (20) of the cantilever crane, and lift the hook (20) of the cantilever crane until the moving assembly is completely lifted out of the moving assembly storage cylinder (18).

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