CN109848683B - Spent fuel grillwork extracting tool of nuclear power station - Google Patents
Spent fuel grillwork extracting tool of nuclear power station Download PDFInfo
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- CN109848683B CN109848683B CN201811486055.2A CN201811486055A CN109848683B CN 109848683 B CN109848683 B CN 109848683B CN 201811486055 A CN201811486055 A CN 201811486055A CN 109848683 B CN109848683 B CN 109848683B
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Abstract
The invention discloses a spent fuel grillwork disassembling tool for a nuclear power station, which comprises: the bracket is provided with a first guide wheel with adjustable height; the long rod tool is detachably overlapped on the first guide wheel of the bracket and can slide on the first guide wheel; the support guide device is arranged on the long rod tool, the height and the width of the support guide device are matched with those of a sleeve to be disassembled, and the support guide device is used for supporting, guiding and centering the long rod tool in the sleeve when a fastener of the sleeve is disassembled; and the fastener adapter head is detachably fixed at the front end of the long rod tool and is matched with the fastener of the sleeve to be detached. Compared with the prior art, the disassembling tool for the spent fuel grillwork of the nuclear power station has the advantages of simple structure, convenience in operation, high disassembling speed and safety in use.
Description
Technical Field
The invention belongs to the field of nuclear power, and particularly relates to a disassembling tool for a spent fuel grillwork of a nuclear power station.
Background
The spent fuel grillwork is an important device in a fuel transfer system of a nuclear power plant and is generally arranged in a spent fuel storage pool of a fuel plant. Along with the long-term operation of the nuclear power station, the storage capacity of the original spent fuel grillwork cannot meet the requirement, and the grillworks with large capacity need to be replaced, but after the grillworks are replaced from the nuclear power station, the grillworks are temporarily stored in a power station machine maintenance factory building, and due to the fact that the grillworks are large in size and large in occupied space, treatment is needed urgently. Because the spent fuel framework stores spent fuel assemblies in the using process, radioactive contamination remains in the framework, partial materials are possibly activated, and the framework is difficult to disassemble due to the existence of radioactive substances.
The traditional method for disassembling the grillwork is to use a simple long rod tool to disassemble the bolt (nut) from the upper part of the sleeve, the sight line cannot be reached because the bolt (nut) is positioned at the bottom of the sleeve, and the traditional long rod tool cannot be effectively positioned, is long in length and low in rigidity, so that the reliability of the tool is poor, the operation difficulty is high, the efficiency is low, and the risk that an operator is irradiated is increased.
In view of this, it is necessary to provide a spent fuel rack dismantling tool for a nuclear power plant, which has a simple structure, reliable operation, fast dismantling speed and safe use.
Disclosure of Invention
The invention aims to: the disassembling tool for the spent fuel grillwork of the nuclear power station overcomes the defects of the prior art, and is simple in structure, reliable in operation, high in disassembling speed and safe in use.
In order to achieve the above object, the present invention provides a spent fuel rack dismounting tool for a nuclear power plant, including:
the bracket is provided with a first guide wheel with adjustable height;
the long rod tool is detachably overlapped on the first guide wheel of the bracket and can slide on the first guide wheel;
the support guide device is arranged on the long rod tool, the height and the width of the support guide device are matched with those of a sleeve to be disassembled, and the support guide device is used for supporting, guiding and centering the long rod tool in the sleeve when a fastener of the sleeve is disassembled; the supporting and guiding device is provided with a guide plate and second guide wheels, a fixing hole is formed in the middle of the guide plate, the guide plate is sleeved on the long rod tool, two second guide wheels are arranged on two opposite corners of the guide plate respectively, one of the second guide wheels is fixedly arranged on a corner of the guide plate, the other second guide wheel is arranged in a sliding groove formed in the guide plate, a spring is arranged at the bottom of the sliding groove, and the spring can enable the second guide wheel to float along the diagonal direction when stretching; and
the fastener adapter head is detachably fixed at the front end of the long rod tool and is matched with the fastener of the sleeve to be detached.
As an improvement of the spent fuel grillwork disassembling tool for the nuclear power station, the bottom of the support is provided with universal casters.
As an improvement of the disassembling tool for the spent fuel grillwork of the nuclear power plant, the fastener adapter comprises a detachable nut adapter and a detachable bolt adapter which are respectively matched with a sleeve connecting nut and a supporting leg adjusting bolt in the fastener of the sleeve.
As an improvement of the spent fuel grillwork disassembling tool for the nuclear power station, the tail end of the long rod tool is connected with a handle, or the tail end of the long rod tool is connected with an electric driving device or a gas driving device for rotation.
The disassembling tool for the spent fuel grillwork of the nuclear power station also comprises an operating platform.
As an improvement of the spent fuel grillwork disassembling tool for the nuclear power station, the bracket is also provided with a detachable sleeve clamping ring for clamping a sleeve.
As an improvement of the spent fuel framework disassembling tool for the nuclear power station, the sleeve retainer ring comprises a support, a clamping bolt and a nut, the support is detachably fixed on the support, and the clamping bolt penetrates through the support and is connected with the support through the nut and the thread.
As an improvement of the spent fuel lattice frame disassembling tool for the nuclear power station, the long rod tool is provided with a probe used for detecting the radioactive dose rate of the lattice frame.
Compared with the prior art, the disassembling tool for the spent fuel grillwork of the nuclear power station has the following beneficial technical effects:
1) the long rod tool and the matched auxiliary tool are adopted, so that the radioactive sleeve can be rapidly disassembled;
2) the structure is simple, the manufacture is easy, the operation is convenient, the use is safe, the nuclear pollution waste can be avoided, the surface decontamination is convenient, and the generation amount of the secondary waste is reduced;
3) the fuel grid is suitable for dismounting sleeves with different mounting heights, all the sleeves can be dismounted under the condition that the fuel grid is in place at one time, and the operations of hoisting and carrying are reduced.
Drawings
The spent fuel framework dismantling tool for a nuclear power plant of the invention is described in detail below with reference to the accompanying drawings and specific embodiments, wherein:
fig. 1 is a schematic structural diagram of the spent fuel lattice dismounting tool for a nuclear power plant.
Fig. 2 is a partial sectional view of the spent fuel trellis dismantling tool for a nuclear power plant.
Fig. 3 is a schematic view of a long rod tool in use state of the spent fuel lattice dismounting tool for a nuclear power plant of the invention.
Fig. 4 is a partially enlarged view of fig. 3.
FIG. 5 is a schematic view of the plane A-A in FIG. 4.
Fig. 6 is an installation schematic diagram of a dismounting sleeve of the spent fuel framework dismounting tool for the nuclear power plant.
Fig. 7 is an enlarged schematic view of circle a of fig. 6.
Reference numerals:
10-a scaffold; 100-a bottom frame; 102-a support bar; 104-universal castor; 106-a mounting member; 1060-fixed block; 1062-support block; 108-a latch; 12-a first guide wheel; 14-long pole tool; 140-a handle; 16-a support guide; 160-a second guide wheel; 161-a second guide wheel; 162-a guide plate; 1620-a decision section; 164-mounting stand-offs; 166-a spring; 18-fastener adapter head; 20-an operation table; 22-a casing collar; 220-a support; 222-a clamping bolt; 224-a nut; 24-a guide roller; 30-a cannula; 32-sleeve coupling nut; 34-leg adjusting bolt.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 7, the tool for disassembling a spent fuel lattice of a nuclear power plant according to the present invention includes:
a bracket 10 on which a first guide wheel 12 with adjustable height is mounted;
a long rod tool 14 which is removably overlapped on the first guide wheel 12 of the bracket 10 and can slide on the first guide wheel 12;
a support guide 16 mounted on the long rod tool 14 and having a height and width adapted to the sleeve 30 to be removed, for supporting, guiding and centering the long rod tool 14 within the sleeve 30 when removing the fastener of the sleeve 30; and
a fastener adapter 18 removably secured to the front end of the elongate tool 14 is adapted to fit the fastener of the sleeve 30 to be removed.
Referring to fig. 1, 6 and 7, the stand 10 is a movable stand, and includes a bottom frame 100, a support rod 102 fixed to the bottom frame 100 for supporting, and a mounting member 106 for detachably fixing the first guide wheel 12 or the sleeve collar 22, wherein a plurality of casters 104 are mounted on the bottom of the bottom frame 100, and in the illustrated embodiment, 4 casters 104 are mounted on the bottom of the bottom frame 100, one at each corner, for supporting and moving the pole tool 14.
As shown in fig. 1, fig. 6 and fig. 7, the support rod 102 is a channel steel in the illustrated embodiment, and the support rod 102 is provided with a plurality of fixing holes at intervals along the radial direction, and the positions of the fixing holes correspond to the height of the sleeve 30.
As shown in fig. 1, 6 and 7, the mounting member 106 includes a fixing block 1060 and a supporting block 1062, and the fixing block 1060 and the supporting block 1062 are fixedly connected by welding or bolts. In the illustrated embodiment, the fixing block 1060 is a channel steel structure and is located in the groove of the support rod 102, fixing holes are formed in the upper and lower ends of the fixing block 1060, the positions of the fixing holes correspond to the positions of the fixing holes in the support rod 102, the fixing holes are detachably fixed to the support rod 102 through bolts 108, and the mounting component 106 can be mounted at a desired height by adjusting the position of the fixing block 1060 in the vertical direction.
In the illustrated embodiment, support block 1062 is welded or bolted at one end to the back of the groove in mounting block 1060 and at the other end to mount first idler 12 or ferrule collar 22.
In other embodiments of the present invention, the support 10 may be configured to be automatically clamped and lifted for height adjustment so as to detach the fuel racks of different heights, and may be configured to be moved in an automatic traveling manner.
The first guide wheel 12 is a grooved guide wheel and is mounted at the end of the support block 1062 of the frame 10 by means of a removable mounting bracket (not numbered), in the same way as is usual for guide wheels of the prior art and will not be described in detail here. The height of the first guide wheel 12 can be adjusted along with the up-and-down movement of the mounting part 106 of the bracket 10, so as to be suitable for the disassembly of the sleeves 30 with different heights. The size of the first guide wheel 12 groove is matched with the outer diameter of the long rod tool 14, the long rod tool 14 can be guided and limited, and flexible operation of the whole grid disassembling tool is achieved.
The long rod tool 14 is a long rod with certain rigidity and strength, is removably lapped on the first guide wheel 12 of the bracket 10, and can slide on the first guide wheel 12; the length and outer diameter can be set as desired, and when manually operated, the end of the pole tool 14 is provided with a handle 140. When automatic disassembly is required, the end of the long tool 14 is connected to an electric drive (not shown), preferably an electric wrench, or an air drive (not shown), preferably an air driven wrench, for rotary disassembly. In the illustrated embodiment, removal is by manual application, and thus a handle 140 is provided at the distal end of the pole tool 14.
Further, in order to effectively detect the radioactive dose before the disassembly, a detachable dose detection probe holder is mounted on the long rod tool, and a probe (not shown) for detecting the surface dose rate of the grid sleeve 30 is mounted on the holder.
Referring to fig. 3 to 5, the supporting and guiding device 16 is sleeved on the pole tool 14 and can be installed at different positions of the pole tool 14 as required, the supporting and guiding device 16 includes a guiding plate 162 and second guiding wheels 160,161 installed on the guiding plate 162, the guiding plate 162 is a square plate, the middle portion of the guiding plate is provided with a fixing hole, the guiding plate 162 is sleeved on the pole tool 14, the guiding plate 162 is provided with two second guiding wheels 160,161, mainly installed on two opposite corners of the guiding plate 162, and the other two opposite corners of the guiding plate 162 are chamfered.
Specifically, two opposite corners of the guide plate 162 are respectively provided with a second guide wheel, one second guide wheel 160 is fixedly installed at one corner of the guide plate 162, and the other second guide wheel 161 is installed at the other corner of the guide plate 162 in a floating manner.
Specifically, a fixing portion 1620 is protruded from one corner of the guide plate 162, the fixing portion is formed with a U-shaped groove, and the second guide wheel 160 is fixed in the U-shaped groove.
A sliding groove (not numbered) is formed at the other corner of the guide plate 162, the second guide wheel 161 is mounted in the sliding groove formed in the guide plate 162 through a mounting support 164, and a spring 166 is arranged at the bottom of the sliding groove, and the spring 166 enables the second guide wheel 161 to float along the diagonal direction when the second guide wheel extends and contracts.
The guide plate 162 is provided with a limiting block 168 at the corner of the sliding groove, a limiting groove is formed in the mounting support 164 corresponding to the limiting block 168, one end of the limiting block 168 is inserted into the limiting groove, the limiting groove has a certain length, so that the mounting support 164 has a certain sliding distance in the sliding process, and the mounting support 164 can be prevented from being separated from the sliding groove of the guide plate 162 by mounting the limiting block 168 in the limiting groove.
The floating second guide wheel 161 facilitates installation of the pole tool 14 and guiding and centering while moving within the sleeve 30, enabling automatic alignment of the pole tool 14 during removal of the fasteners (sleeve union nut 32 and foot adjustment bolt 34) of the sleeve 30.
The fastener adapter 18 is removably secured to the front end of the pole tool 14 and includes a removable nut adapter that fits over the bushing nut 32 of the bushing 30 fastener and that can be removed to remove the removed bushing nut 32 and a bolt adapter that fits over the leg adjustment bolt 34 of the bushing 30 fastener. Specifically, the fastener adapter 18 fits over the front end of the pole tool 14 and is secured thereto by a latch.
During disassembly, the support foot adjusting bolt 34 and the sleeve connecting nut 32 can be respectively matched by replacing the adapter, so that the functions of disassembling and taking out the support foot adjusting bolt 34 and the sleeve connecting nut 32 are realized.
Specifically, be provided with the sleeve on the nut adaptation head with bushing nut 32 fit, when dismantling, the sleeve cover is established in bushing nut 32's outside to rotating stock instrument 14, can dismantling bushing nut 32 of sleeve pipe 30, bushing nut 32 and stabilizer blade adjusting bolt 34 separately the back, bushing nut 32 cover is established in the sleeve, can take out bushing nut 32 through the stock instrument 14 of outwards pulling.
The end of the bolt adapter fitting with the leg adjusting bolt 34 is provided with a detaching structure, the detaching structure is adapted to the end of the leg adjusting bolt 34, the leg adjusting bolt 34 can be detached by rotating the long rod tool 14, and then the leg adjusting bolt 34 is taken out from the outside, so that the sleeve 30 can be detached.
Referring to fig. 6 and 7, in order to realize the function of clamping and pulling the sleeve 30, a sleeve collar 22 is further disposed on the bracket 10, specifically, the sleeve collar 22 includes a support 220, a clamping bolt 222 and a nut 224, and the support 220 is detachably fixed on a support block 1062 of the bracket 10 by a bolt. Specifically, fixing holes are formed in two sides of the support 220, the clamping bolt 222 is of a U-shaped structure, two ends of the clamping bolt are of a threaded structure, the width of the U-shaped structure is matched with the sleeve 30, and when the sleeve 30 is extracted, two ends of the clamping bolt 222 penetrate through the fixing holes in the two sides of the support 220 and are fixed through the nuts 224. The sleeve collar 22 may be disposed below the first guide wheel 12, or may be disposed at the position of the first guide wheel 12 after the first guide wheel 12 is detached, and when disposed below the first guide wheel 12, the support block 1062 for mounting the first guide wheel 12 and the sleeve collar 22 is turned over during use, so as to achieve dual functions.
The ferrule collar 22 is used as follows: before the sleeve 30 is not drawn out, the support 220 of the sleeve collar 22 is firstly installed on the support block 1062 of the bracket 10, and is close to the clamping position of the sleeve 30 (a certain gap exists between the sleeves 30); the clamping bolt 222 is placed at the end of the sleeve 30 at a thin position, passes through the fixing holes arranged at the two sides of the support 220, and the nut 224 is screwed on to clamp the sleeve 30 to prevent the sleeve from falling off in the operation process.
Specifically, after the fastener of the sleeve 30 is disassembled, the long rod tool 14 is removed, the first guide wheel 12 on the support frame 10 is replaced by a sleeve clamping ring 22, the sleeve clamping ring 22 is installed on the installation part 16, the installation part 16 is fixed on the support frame 10 through a bolt 108, the height is adjustable, a sleeve guide roller 24 is placed at the lower part of the sleeve 30, the guide roller 24 provides support for the extraction of the sleeve 30, one end of the sleeve 30 is fixed on the support frame 10 through the sleeve clamping ring 22, the other end of the sleeve 30 is supported on the guide roller 24, the support frame 10 is moved to horizontally extract the sleeve 30, and the sleeve 30 is integrally taken away by using an auxiliary hoisting tool, so that the disassembly of the sleeve 30 can be completed.
In order to provide auxiliary support in the operation process, the tool for disassembling the spent fuel grillwork of the nuclear power plant is further provided with an operating platform 20, the size and the structure of the operating platform 20 can be adjusted according to needs, when the tool is used, the operating platform 20 is placed beside the fuel grillwork, and through the tools, an operator can realize quick disassembly and extraction of the bolts, the nuts and the sleeves 30.
The working principle of the spent fuel lattice disassembling tool for the nuclear power plant of the invention is now described with reference to fig. 1 and 3:
referring to fig. 1, according to the height of the sleeve 30 to be disassembled, the height of the first guide wheel 12 on the bracket 10 is adjusted and fixed by the bolt 108, the long rod tool 14 is installed on the bracket 10 together with the bolt adapter fitting the leg adjusting bolt 34 and the support guide device 16, the bracket 10 is pushed to be close to the sleeve 30 to be disassembled, the long rod tool 14 is pushed into the sleeve 30 and is aligned with the leg adjusting bolt 34 in the fastener of the sleeve 30, and the leg adjusting bolt 34 is disassembled by rotating the long rod tool 14; the bolt adapter is replaced with a nut adapter fitted to the sleeve union nut 32, and the sleeve union nut 32 of the sleeve 30 is removed by repeating the above operation.
Referring to fig. 3, after the long pole tool 14 enters the sleeve 30 for a certain distance, its support and guidance is achieved by the support and guide means 16, ensuring that the fastener adapter 18 is finally quickly centered with the leg adjustment bolt 34/sleeve connection nut 32; the support guide 16 is tensioned inside the sleeve 30 by the internal spring 166 and keeps the center of the long pole tool 14 consistent with the center of the sleeve 30; fine adjustment (rotation, tilting operation) of the fastener adapter 18 into position is controlled by the long rod tool 14; after the leg adjusting bolt 34 is removed, the fastener adapter 18 is replaced with a nut adapter adapted to the bushing coupling nut 32, and the leg adjusting bolt 34/bushing coupling nut 32 can be removed respectively; removal of the leg adjust bolt 34/sleeve attach nut 32 is accomplished by a handle 140 at the end of the pole tool 14; the foot adjustment bolt 34 is removed from the exterior of the sleeve 30 after being unscrewed, and the sleeve attachment nut 32 is loosened and then snapped into the socket of the nut adapter, thereby allowing the pole tool 14 to be removed from the interior of the sleeve 30 for disposal after it is removed.
Compared with the prior art, the disassembling tool for the spent fuel grillwork of the nuclear power station has the following beneficial technical effects:
1) the long rod tool 14 and the matched auxiliary tool are adopted, so that the radioactive sleeve 30 can be rapidly disassembled;
2) the structure is simple, the manufacture is easy, the operation is convenient, the use is safe, the nuclear pollution waste can be avoided, the surface decontamination is convenient, and the generation amount of the secondary waste is reduced;
3) meanwhile, the fuel grid is suitable for dismounting the sleeves 30 with different mounting heights, all the sleeves can be dismounted under the condition that the fuel grid is in place at one time, and the operation of hoisting and carrying is reduced.
The present invention can be modified and adapted appropriately from the above-described embodiments, according to the principles described above. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (7)
1. The utility model provides a nuclear power station spent fuel grillage extracting tool which characterized in that includes:
the bracket is provided with a first guide wheel with adjustable height;
the long rod tool is detachably overlapped on the first guide wheel of the bracket and can slide on the first guide wheel;
the support guide device is arranged on the long rod tool, the height and the width of the support guide device are matched with those of a sleeve to be disassembled, and the support guide device is used for supporting, guiding and centering the long rod tool in the sleeve when a fastener of the sleeve is disassembled; the supporting and guiding device is provided with a guide plate and second guide wheels, a fixing hole is formed in the middle of the guide plate, the guide plate is sleeved on the long rod tool, two second guide wheels are arranged on two opposite corners of the guide plate respectively, one of the second guide wheels is fixedly arranged on a corner of the guide plate, the other second guide wheel is arranged in a sliding groove formed in the guide plate, a spring is arranged at the bottom of the sliding groove, and the spring can enable the second guide wheel to float along the diagonal direction when stretching; and
the fastener adapter is detachably fixed at the front end of the long rod tool and is adapted to the fastener of the sleeve to be detached; the fastener adapter comprises a detachable nut adapter and a detachable bolt adapter, and is respectively fitted with a sleeve connecting nut and a supporting leg adjusting bolt in the sleeved fastener.
2. The tool for disassembling the spent fuel lattice of the nuclear power plant as claimed in claim 1, wherein casters are mounted at the bottom of the support.
3. The nuclear power plant spent fuel lattice disassembling tool according to claim 1, wherein a handle is connected to an end of the long rod tool, or an electric driving device or a gas driving device is connected to an end of the long rod tool for rotation.
4. The nuclear power plant spent fuel lattice dismantling tool according to any one of claims 1 to 3, further comprising an operation panel.
5. The tool for disassembling the spent fuel lattice of the nuclear power plant as claimed in claim 1, wherein a detachable collar of a sleeve is further provided on the support for clamping the sleeve.
6. The tool for disassembling the spent fuel lattice of the nuclear power plant as claimed in claim 5, wherein the collar comprises a support, a clamping bolt and a nut, the support is detachably fixed on the support, and the clamping bolt is arranged on the support in a penetrating manner and is in threaded connection through the nut.
7. The tool for disassembling the spent fuel lattice of the nuclear power plant as claimed in claim 1, wherein the long rod tool is provided with a probe for detecting the radioactive dose rate of the lattice.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811486055.2A CN109848683B (en) | 2018-12-06 | 2018-12-06 | Spent fuel grillwork extracting tool of nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811486055.2A CN109848683B (en) | 2018-12-06 | 2018-12-06 | Spent fuel grillwork extracting tool of nuclear power station |
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| CN109848683B true CN109848683B (en) | 2021-08-31 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111215737B (en) * | 2020-01-23 | 2021-11-26 | 岭东核电有限公司 | Cutting system of nuclear power station spent fuel grillwork |
| CN111824938A (en) * | 2020-07-20 | 2020-10-27 | 中国核动力研究设计院 | Spent fuel storage framework transporting and overturning device and mounting method |
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| CN207229921U (en) * | 2017-09-27 | 2018-04-13 | 黄港路 | A kind of new anchor ear |
| CN108708891A (en) * | 2018-05-22 | 2018-10-26 | 广东核电合营有限公司 | Spent Fuel Pool dilatation screen work attachment device and attaching method thereof |
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| US7451660B2 (en) * | 2005-01-12 | 2008-11-18 | Tenneco Automotive Operating Company Inc. | Post calibration catalytic converter canning apparatus and method |
| CN105499969A (en) * | 2014-09-22 | 2016-04-20 | 上海航天精密机械研究所 | Rotational tube feeding platform for precise cylindrical part |
| CN207229921U (en) * | 2017-09-27 | 2018-04-13 | 黄港路 | A kind of new anchor ear |
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