Non-entering type steam generator blocking plate mounting device and method

Abstract

The invention discloses a non-entering type steam generator blocking plate mounting device and method, relates to the technical field of steam generator maintenance, and aims to solve the problems that a main pipeline blocking plate of an existing steam generator is difficult to mount and operate, the radiation dose suffered by personnel is high, and the safety risk is high. The device comprises a mounting base used for fixing the plug board mounting device on the steam generator, a cantilever assembly is arranged on the upper portion of the mounting base and comprises a stand column arranged on the mounting base and a swing rod with one end rotationally connected to the stand column, a monitoring camera is arranged on the swing rod, a cantilever is arranged at the other end of the swing rod, and the monitoring camera is arranged on the cantilever. The cantilever is used for hanging the pulley assembly and connected with the stand column through a steel wire rope; a steel wire rope extends out of the winch and penetrates through the upper end of a fixed pulley of the pulley assembly, and a lifting hook used for being connected with a blocking plate is arranged on the steel wire rope penetrating through one end of the fixed pulley.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power steam generator maintenance technology, specifically relating to a non-entry steam generator plug plate installation device and method. Background Technology

[0002] Steam generator main pipe plugs are essential specialized equipment for steam generator maintenance, primarily used in nuclear power plants during cold shutdown to temporarily seal the primary side main pipe openings of the steam generator water chamber. Because the manhole diameter in the water chamber is smaller than the main pipe opening, the plug is typically designed as several small plates. During installation, these are first inserted into the water chamber through the narrow manhole, and then assembled into a large plate for sealing. The entire installation process involves significant operations within the water chamber. The plugs are divided into two main categories: anti-foreign-object plugs and high-water-level plugs. 1) Anti-foreign-object plugs prevent personnel, tools, equipment, and other foreign objects from falling into the main pipe during maintenance work inside the water chamber. A typical foreign object blocking plate consists of several narrow plates hinged together. Before installation, these plates are folded together to reduce their size. They are inserted through the manhole and unfold into a large circular plate within the water chamber. The plate then rests on the flange of the main pipe under its own weight, effectively blocking foreign objects. Because it is not pressurized, no additional bolts are needed for tightening. 2) The high-water-level sealing plate, in addition to preventing foreign objects, also seals the main pipe opening to prevent backflow of primary cooling water when the main pipe is under high water-level conditions. The high-water-level blocking plate is generally composed of three plates spliced ​​together. During installation, these plates are sequentially inserted through the manhole into the water chamber and assembled into a circular plate at the main pipe opening. Finally, each blocking plate is bolted to the flange of the main pipe opening, thus bearing the water pressure within the pipe and achieving a seal. Since at least one of these two types of blocking plates must be installed before each maintenance operation in the primary side water chamber of the steam generator, the installation and removal of these blocking plates is a frequent task. Currently, most mainstream steam generator main pipe plugs in China are installed using a personnel-access method, requiring multiple people to repeatedly enter and exit the steam generator's water chamber for installation and removal. This presents numerous disadvantages, including confined space within the water chamber, high operational difficulty, significant radiation exposure to personnel, and substantial psychological stress from the high-radioactivity environment, resulting in an extremely high risk of human error.

[0003] To address the aforementioned pain points, a better solution is to minimize or avoid personnel entering the water chamber during operations to reduce risks. To this end, some nuclear power plants have adopted an unmanned, non-invasive foreign object blocking tool. During use, a pulley assembly needs to be temporarily fixed inside a specific pipe hole in the tube sheet as a hoisting anchor point for installing and removing the blocking plate. Because the hoisting point must be directly above the main pipe, and the pipe hole is relatively far horizontally from the manhole, a long-pole tool is required for remote operation. However, feedback from actual use indicates several drawbacks: the installation process is complex, accurately positioning the anchor point and inserting it into the pipe hole manually is difficult, and it requires a high level of physical strength, skill, and proficiency from the operator. Furthermore, it can only be used to install foreign object blocking plates and not high-water-level blocking plates, which limits its application and prevents widespread adoption. In recent years, some manufacturers have also developed various types of robotic arm blocking equipment. Such equipment has some problems to varying degrees, such as: complex structure, large weight and size, many auxiliary electrical devices, need to connect multiple cables, cumbersome operation and many parameter variables that need to be adjusted. In practice, the long installation and adjustment time of the robot itself often results in a high cumulative radiation dose to personnel. In addition, the high knowledge and skills required for operators mean that there are few such robotic arm equipment that can be used in actual engineering. Summary of the Invention

[0004] The purpose of this invention is to provide a non-intrusive steam generator plug installation device and method, which solves the problems of difficult operation, high radiation dose to personnel, and high safety risks associated with the installation of plugs on the main pipeline of existing steam generators.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a non-entry steam generator plug plate installation device, the device comprising: a mounting base for fixing the plug plate installation device on the steam generator, a cantilever assembly provided on the upper part of the mounting base, the cantilever assembly comprising: a column provided on the mounting base and a swing rod rotatably connected to the column at one end, a cantilever provided at the other end of the swing rod, the cantilever being used to hang a pulley assembly, the cantilever being connected to the column by a steel wire rope; a winch is also installed at the bottom of the mounting base, a steel wire rope extending from the winch passing through the upper end of the fixed pulley of the pulley assembly, and a hook for connecting to the plug plate is provided on the steel wire rope passing through the other end of the fixed pulley.

[0006] In the aforementioned non-entry steam generator plug installation device, the lower part of the column is fitted with a swing block that can rotate around the column, and the lower end of the swing rod is hinged to the swing block.

[0007] The aforementioned non-entry steam generator plug plate installation device includes a cantilever with several toothed protrusions for hanging pulley assemblies. The front and rear positions of the pulley assemblies can be adjusted by hanging them between different teeth.

[0008] The aforementioned non-entry steam generator plug installation device includes a pulley assembly comprising a horizontal shaft suspended between cantilever teeth, wherein the fixed pulley of the pulley assembly is connected to the horizontal shaft via a figure-eight ring on its upper part.

[0009] In the aforementioned non-entry steam generator plug installation device, the upper part of the end of the toothed cantilever connected to the swing arm and the top of the column are connected to a tensioning wire rope, and the extension amount of the cantilever is adjusted by adjusting the length of the tensioning wire rope.

[0010] The aforementioned non-entry steam generator plug plate installation device includes a winch with a lifting wire rope extending from it. The wire rope passes through the bottom of the mounting base, exits from the top, and finally exits from the top of the fixed pulley. A circular flange is provided on the hook at one end of the wire rope to fit into the lifting lug groove on the plug plate. The length of the lifting wire rope can be controlled by the winch to move the plug plate.

[0011] The aforementioned non-entry steam generator plug installation device is equipped with a push rod tool, including: a push rod handle and a hook with an irregular structure at one end of the push rod handle; the push rod tool is used to adjust the extension length of the pulley assembly on the cantilever and to remotely adjust the orientation of the plug during lifting.

[0012] The aforementioned non-entry steam generator plug installation device is equipped with a remote bolt tightening tool, including a hand-held long handle and a wrench at one end of the hand-held long handle. A joint with a locking function is provided between the two, and the angle of the joint can be adjusted to adapt to the orientation of the plug fastening bolt head in different positions.

[0013] In the aforementioned non-entry steam generator plug installation device, a monitoring camera is fixedly installed on the swing arm, and the power line and signal transmission line of the monitoring camera are sequentially connected through the inside of the swing arm and the mounting base.

[0014] A method for operating a non-entry steam generator plug plate installation device, wherein the method includes: Step 1: After assembling the plug plate installation device outside the steam generator, adjust the opening angle of the swing arm and column and fix them with the retractable steel wire rope. Then, fold the cantilever assembly of the installation device upward and extend it into the water chamber of the steam generator through the manhole. Step 2: Secure the winch and the bottom of the mounting base to the flange bolt holes of the steam generator manhole using double-ended studs, and then rotate the swing block to make the swing rod face the pipe opening of the main steam generator pipe; Step 3: Observe the position of the hook through the camera, put the hook of the push rod tool into the figure-eight ring of the pulley assembly, and adjust the position of the pulley assembly back and forth so that the hook is directly facing the opening of the main pipe of the steam generator below. Step 4: While releasing the winch lifting wire rope, use a pusher tool to pull the hook out of the steam generator water chamber from the manhole of the steam generator. Then hook the hook onto the lifting lug groove on the blocking plate, tighten and fix it, and at the same time tighten the winch lifting wire rope, send the blocking plate into the steam generator water chamber through the steam generator manhole. Step 5: After the plug plate enters the water chamber of the steam generator, continue to tighten the winch hoisting wire rope to lift the plug plate, and at the same time use the push rod tool to adjust the position of the plug plate so that it sits on the main pipe of the steam generator. Step Six: After the blocking plate is seated, operate the winch to release the winch lifting wire rope, and use the push rod tool to remotely separate the hook from the blocking plate. If the blocking plate is a split type, repeat steps four, five, and six to hoist and seat multiple split blocking plates in sequence. Step 7: After the plug plate is in place, tighten the bolts using a remote bolting tool, then confirm the plug plate is installed correctly using a camera. Finally, remove the plug plate installation device from the steam generator manhole to complete the plug plate installation.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The non-entry steam generator plug plate installation device and method provided by the present invention, on the one hand, does not require personnel to enter the water chamber of the steam generator to install and remove the plug plate by using the device, which greatly reduces the radiation dose to the operators compared with the entry installation / removal method; on the other hand, through the device structure design and matching tools, the efficiency of plug plate installation and removal can be improved. Attached Figure Description

[0016] Figure 1 The diagram shown is a structural schematic of a non-entry steam generator plug plate installation device according to the present invention. Figure 2 The diagram shows a push rod structure of a non-entry steam generator plug plate installation device according to the present invention. Figure 3 The diagram shows a remote bolt tightening tool structure for a non-entry steam generator plug plate installation device according to the present invention.

[0017] Figure 4 The diagram shown illustrates the installation process of a non-entry steam generator plug plate installation device according to the present invention.

[0018] Reference numerals: 1. Winch; 2. Mounting base; 3. Column; 4. Retractable wire rope; 5. Swing rod; 6. Camera; 7. Cantilever; 8. Horizontal shaft; 9. Figure-eight ring; 10. Fixed pulley; 11. Winch lifting wire rope; 12. Hook; 13. Hook hook; 14. Push rod handle; 15. Wrench; 16. Handheld long handle; 17. Steam generator water chamber; 18. Steam generator manhole; 19. Blocking plate installation device; 20. Remote bolt tightening tool; 21. Push rod tool; 22. Blocking plate; 23. Steam generator main pipe. Detailed Implementation

[0019] To address the problems of difficult installation and operation of existing steam generator main pipeline plugs, high radiation exposure for personnel, and high safety risks, this invention provides a non-entry steam generator plug installation device and method. Figures 1-4 As shown, the device includes: a mounting base 2 for fixing the plug plate installation device 19 to the flange bolt holes of the steam generator manhole 18; a cantilever assembly is provided on the upper part of the mounting base 2; the cantilever assembly includes: a column 3 mounted on the mounting base 2 and a swing rod 5 rotatably connected to the column 3 at one end; a swing block that can rotate circumferentially around the column 3 is sleeved on the lower part of the column 3; the lower end of the swing rod 5 is hinged to the swing block, and the swing block can adjust the left and right angles of the swing rod. A monitoring camera 6 is also fixedly mounted on the swing rod 5; the power cord and signal transmission line of the monitoring camera 6 are sequentially connected through the swing rod 5 and the interior of the mounting base 2. The monitoring camera 6 can remotely monitor and check whether the lower plug plate is in place, whether the high-water-level plug plate fastening bolts are tightened, and other installation processes.

[0020] The other end of the lever 5 is provided with a cantilever 7, which is used to attach the pulley assembly. The cantilever 7 is provided with several toothed protrusions for attaching the pulley assembly. By attaching the pulley assembly between different teeth, the front and rear positions of the pulley assembly can be adjusted. The pulley assembly includes: a horizontal shaft 8 attached between the teeth of the cantilever 7, and the fixed pulley 10 of the pulley assembly is connected to the horizontal shaft 8 through a figure-eight ring 9 on its upper part.

[0021] The upper part of the toothed cantilever 7 connected to the swing arm 5 and the top of the column 5 are connected to a tensioning wire rope 4. The extension of the cantilever 5 is adjusted by adjusting the length of the tensioning wire rope 4. A winch 1 is also installed at the bottom of the mounting base 2. A winch lifting wire rope 11 is led out from the winch 1. The winch lifting wire rope 11 passes through the bottom of the mounting base 2, exits through the top, and finally exits through the upper part of the fixed pulley 10. A hook 12 for connecting with the blocking plate 22 is provided on the winch lifting wire rope 11 that passes through the fixed pulley 10. The hook 12 is provided with a circular flange that matches the lifting lug groove on the blocking plate 22. Shaking the winch 1 can control the extension and retraction of the length of the winch lifting wire rope 11, thereby moving the position of the blocking plate 22.

[0022] The blocking plate installation device 19 is equipped with a push rod tool 21 with a long rod structure. The push rod tool 21 includes a push rod handle 14 and a hook 13 with an irregular structure at one end of the push rod handle 14. The hook 13 can be adapted to the figure-eight ring 9 on the pulley assembly to adjust the extension length of the pulley assembly on the cantilever 7, and remotely adjust the position of the blocking plate 22 during lifting.

[0023] The plug installation device 19 is also equipped with a long-handled remote bolt tightening tool 20. The remote bolt tightening tool 20 includes a handheld long handle 16 and a wrench 15 at one end of the handheld long handle 16. A locking joint is provided between the two, which can adapt to the orientation of the plug fastening bolt heads in different positions, and adjust and lock the relative angle between the two. This allows personnel to reach into the steam generator manhole 18 without entering the steam generator water chamber 17 to remotely tighten the plug 22 fixing bolts with a certain tilt angle.

[0024] The operation method of the non-entry steam generator plug plate mounting device 19 includes the following steps: Step 1: After assembling the plug plate mounting device 19 outside the steam generator, adjust the opening angle of the swing rod 5 and the column 3 and fix them with the retractable steel wire rope 4, fold the cantilever assembly of the mounting device 19 upward and extend it into the water chamber 17 of the steam generator through the manhole 18 of the steam generator. Step 2: Fix the bottom of the winch 1 and the mounting base 2 to the flange bolt holes of the manhole 18 of the steam generator using double-ended studs, and then rotate the swing block to make the swing rod 5 face the pipe opening of the main pipe 23 of the steam generator. Step 3: Observe the position of the hook 12 through the camera 6, put the hook 13 of the push rod tool 21 into the figure-eight ring 9 of the pulley assembly, and adjust the position of the pulley assembly back and forth so that the hook 12 is directly facing the opening of the main pipe 23 of the steam generator below. Step 4: While releasing the winch lifting wire rope 11, use the push rod tool 21 to pull the hook 12 out of the steam generator water chamber 17 from the steam generator manhole 18. Then, hook the hook 12 onto the lifting lug groove on the blocking plate 22, tighten and fix it, and while tightening the winch lifting wire rope 11, send the blocking plate 22 into the steam generator water chamber 17 through the steam generator manhole 18. Step 5: After the blocking plate 22 enters the water chamber 17 of the steam generator, continue to tighten the winch hoisting wire rope 11 to hoist the blocking plate 22. At the same time, use the push rod tool 21 to adjust the position of the blocking plate 22 so that it sits on the main pipe 23 of the steam generator. Step Six: After the blocking plate 22 is seated, operate the winch 1 to release the winch lifting wire rope 11, and use the push rod tool 21 to remotely separate the hook 12 from the blocking plate 22. If the blocking plate 22 is a split type, repeat steps four, five, and six to hoist multiple split blocking plates 22 into place in sequence. If the blocking plate 22 is a whole folding type, the blocking plate 22 can be hoisted into the steam generator water chamber 17 from the steam generator manhole 18 and then unfolded. Step 7: After the plug plate 22 is in place, use the remote bolt tightening tool 20 to tighten the bolts, and then use the camera 6 to confirm whether the plug plate 22 is installed in place. Finally, remove the plug plate installation device 19 from the steam generator manhole 18 to complete the installation of the plug plate 22.

[0025] The disassembly process of the blocking plate 22 is the reverse process of the installation process. The blocking plate can also be disassembled using the blocking plate installation device 19 provided by the present invention.

[0026] It should be noted that the combination of the technical features in the embodiments of the present invention is not limited to the combination methods described in the embodiments of the present invention or the combination methods described in the specific embodiments. All technical features described in the present invention can be freely combined or combined in any way, unless there is a contradiction between them.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-entry steam generator plug plate installation device, characterized in that, The device includes: a mounting base (2) for fixing the block plate mounting device (19) on the steam generator, and a cantilever assembly is provided on the upper part of the mounting base (2). The cantilever assembly includes: a column (3) provided on the mounting base (2) and a swing rod (5) rotatably connected to the column (3) at one end. A cantilever (7) is provided at the other end of the swing rod (5). The cantilever (7) is used to hang the pulley assembly. The cantilever (7) is connected to the column (3) by a wire rope. A winch (1) is also installed at the bottom of the mounting base (2). A wire rope extends out of the winch (1) and passes through the upper end of the fixed pulley (10) of the pulley assembly. A hook (12) for connecting to the block plate (22) is provided on the wire rope passing through the other end of the fixed pulley (10).

2. The non-entry steam generator plug plate installation device according to claim 1, characterized in that, The lower part of the column (3) is fitted with a swing block that can rotate around the column (3) in a circumferential direction, and the lower end of the swing rod (5) is hinged to the swing block.

3. The non-entry steam generator plug plate installation device according to claim 1, characterized in that, The cantilever (7) is provided with several toothed protrusions for hanging pulley assemblies. The front and rear positions of the pulley assemblies can be adjusted by hanging the pulley assemblies between different teeth.

4. A non-entry steam generator plug plate installation device according to claim 3, characterized in that, The pulley assembly includes a horizontal shaft (8) suspended between the teeth of the cantilever (7), and the fixed pulley (10) of the pulley assembly is connected to the horizontal shaft (8) through the figure-eight ring (9) on its upper part.

5. A non-entry steam generator plug plate installation device according to claim 1, characterized in that, The upper part of the toothed cantilever (7) connected to the swing arm (5) and the top of the column (5) are connected to a tensioning wire rope (4). The extension of the cantilever (5) can be adjusted by adjusting the length of the tensioning wire rope (4).

6. A non-entry steam generator plug plate installation device according to claim 1, characterized in that, The winch (1) has a lifting wire rope (11) leading out. The lifting wire rope (11) passes through the bottom of the mounting base (2) and out the top, and finally passes through the upper part of the fixed pulley (10). The hook (12) at one end of the lifting wire rope (11) is provided with a circular flange that matches the lifting lug groove on the plate (22). The length of the lifting wire rope (11) can be controlled by the winch (1), so as to move the position of the plate (22).

7. A non-entry steam generator plug plate installation device according to claim 1, characterized in that, The block plate installation device (19) is equipped with a push rod tool (21), including: a push rod handle (14) and a hook (13) with an irregular structure at one end of the push rod handle (14); the push rod tool (21) is used to adjust the extension length of the pulley assembly on the cantilever (7) and to remotely adjust the orientation of the block plate (22) during lifting.

8. A non-entry steam generator plug plate installation device according to claim 1, characterized in that, The plug installation device (19) is equipped with a remote bolt tightening tool (20), including: a hand-held long handle (16) and a wrench (15) at one end of the hand-held long handle (16). A joint with a locking function is provided between the two. The angle of the joint can be adjusted to adapt to the orientation of the plug fastening bolt head in different positions.

9. A non-entry steam generator plug plate installation device according to claim 1, characterized in that, A monitoring camera (6) is fixedly installed on the swing arm (5). The power line and signal transmission line of the monitoring camera (6) are connected out sequentially through the inside of the swing arm (5) and the mounting base (2).

10. A method for operating a non-entry steam generator plug plate installation device, characterized in that, The method includes: Step 1: After assembling the plug plate installation device (19) outside the steam generator, adjust the opening angle of the swing rod (5) and the column (3) and fix them with the retractable steel wire rope (4), fold the cantilever assembly of the installation device (19) upward and extend it into the water chamber (17) of the steam generator through the manhole (18) of the steam generator. Step 2: Fix the bottom of the winch (1) and the mounting base (2) to the flange bolt holes of the manhole (18) of the steam generator using double-headed studs, and then rotate the swing block to make the swing rod (5) face the pipe opening of the main pipeline (23) of the steam generator; Step 3: Observe the position of the hook (12) through the camera (6), put the hook (13) of the push rod tool (21) into the figure-eight ring (9) of the pulley assembly, and adjust the position of the pulley assembly back and forth so that the hook (12) is directly facing the opening of the main pipe (23) of the steam generator below. Step 4: While releasing the winch lifting wire rope (11), use the push rod tool (21) to pull the hook (12) out of the steam generator water chamber (17) through the steam generator manhole (18). Then hook the hook (12) onto the lifting lug groove on the block plate (22), tighten and fix it, and while tightening the winch lifting wire rope (11), send the block plate (22) into the steam generator water chamber (17) through the steam generator manhole (18). Step 5: After the plug plate (22) enters the water chamber (17) of the steam generator, continue to tighten the winch hoisting wire rope (11) to hoist the plug plate (22), and at the same time use the push rod tool (21) to adjust the position of the plug plate (22) so that it sits on the main pipe (23) of the steam generator; Step 6: After the blocking plate (22) is seated, operate the winch (1) to release the winch lifting wire rope (11), and use the push rod tool (21) to remotely separate the hook (12) from the blocking plate (22). If the blocking plate (22) is a split type, repeat steps 4, 5 and 6 to hoist and seat multiple split blocking plates (22) in sequence. Step 7: After the plug plate (22) is in place, use the remote bolt tightening tool (20) to tighten the bolts and then use the camera (6) to confirm whether the plug plate (22) is installed in place. Finally, remove the plug plate installation device (19) from the steam generator manhole (18) and remove it to complete the installation of the plug plate (22).

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