Grinding box for radioactive valve core of nuclear power plant

Abstract

The utility model discloses a nuclear power plant radioactive valve core grinding box which comprises a box body and a cover plate, the box body is cylindrical, and the box body comprises a bottom plate, a first side plate, a second side plate, a third side plate, a fourth side plate and a fifth side plate; the box body further comprises an inclined plate; the inclined plate is connected with adjacent parts of the first side plate, the fourth side plate and the fifth side plate; the first side plate and the fourth side plate are respectively provided with an operation glove; and one end of the cover plate is rotationally connected with the second side plate or the third side plate. In the radioactive valve element grinding period of the nuclear power plant, aerosol in the radioactive valve element grinding box of the nuclear power plant is always in a controlled state, and the surface pollution risk of workers is controlled. And arrangement of on-site grinding sites can be reduced, and labor and site arrangement cost is saved. Investment of protective articles can be saved, and output of radioactive waste is reduced. The radioactive valve element grinding box for the nuclear power plant is combined with a bent line during human body operation, an upper body trunk is supported by arranging the inclined plate, operation fatigue is reduced, and working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and in particular to a grinding box for radioactive valve cores in nuclear power plants. Background Technology

[0002] During nuclear power plant overhauls, valve disassembly work is carried out in the radiation control area. 80% of the valves require grinding. The initial conditions for grinding require disassembling components such as valve covers and valve cores. During this process, radioactive media in contact with the valve interior can diffuse into the surrounding area and air. Analysis of overhaul deviation data shows that ground contamination, protective equipment contamination, and personnel skin contamination caused by valve grinding and graphite packing replacement work account for over 70% of the total deviations in the static mechanical engineering field. Skin contamination in past overhaul incidents has also been directly or indirectly caused by this process. Therefore, valve grinding work is a major source of contamination diffusion. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a grinding box for radioactive valve cores in nuclear power plants.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a nuclear power plant radioactive valve core grinding box is constructed, including a box body and a cover plate. The box body is cylindrical and includes a bottom plate, a first side plate, a second side plate, a third side plate, a fourth side plate, and a fifth side plate. The bottom plate is pentagonal and includes a first side, a second side, a third side, a fourth side, and a fifth side connected in sequence. The fifth side is arranged opposite to the connection between the second side plate and the third side plate.

[0005] The first side panel, the second side panel, the third side panel, the fourth side panel, and the fifth side panel are perpendicularly connected to the first side, the second side, the third side, the fourth side, and the fifth side, respectively; the box body also includes an inclined plate, which connects the adjacent portions of the first side panel, the fourth side panel, and the fifth side panel; the first side panel and the fourth side panel are each equipped with an operating glove;

[0006] One end of the cover plate is rotatably connected to the second side plate or the third side plate.

[0007] In some embodiments, both the first side plate and the fourth side plate are pentagonal plates, with the inclined edge of the first side plate facing the fourth side plate and the inclined edge of the fourth side plate facing the first side plate; the inclined plate is a pentagonal plate or an isosceles trapezoidal plate.

[0008] The inclined plate connects the inclined edge of the first side plate, the inclined edge of the fourth side plate, and the upper side edge of the fifth side plate.

[0009] In some embodiments, the second side plate and the third side plate have the same structure.

[0010] In some embodiments, the first side plate and the fourth side plate have the same structure.

[0011] In some embodiments, the first side plate includes an outer plate, a middle plate, and an inner plate assembled sequentially from the outside to the inside; the outer plate and the inner plate have the same structure, and both the outer plate and the inner plate are provided with a first through hole; the middle plate is provided with a second through hole, the inner diameter of the second through hole is larger than the inner diameter of the first through hole, and the second through hole defines a movable cavity;

[0012] The first side plate also includes a connecting plate installed in the movable cavity, the connecting plate being connected to the cuff end of the operating glove.

[0013] In some embodiments, the nuclear power plant radioactive valve core grinding box further includes a flange plate, which, together with the connecting plate, is connected to the cuff end of the operating glove.

[0014] In some embodiments, the flange plate and the connecting plate are connected together to the cuff end of the operating glove by fasteners.

[0015] In some embodiments, the fastener includes a combination of bolts and nuts.

[0016] In some embodiments, one end of the cover plate is connected to the second side plate or the third side plate by a hinge or hinge.

[0017] In some embodiments, the housing and the cover are made of a transparent material.

[0018] The following are the beneficial effects of implementing this utility model: This nuclear power plant radioactive valve core grinding box can be used for grinding and replacing packing rings of radioactive valves after disassembly in nuclear power plants. During the grinding of radioactive valve cores in nuclear power plants, the aerosol inside the grinding box is always under control, and the risk of surface contamination for workers is controlled. Using this nuclear power plant radioactive valve core grinding box can reduce the need for on-site grinding areas, saving labor and site setup costs. It can also save on the investment in protective equipment and reduce the generation of radioactive waste. The nuclear power plant radioactive valve core grinding box incorporates the curved lines of the human body during operation, and by setting up an inclined plate, it provides support for the upper torso, reducing work fatigue and improving work efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a nuclear power plant radioactive valve core grinding box in some embodiments of this utility model;

[0021] Figure 2 This is a schematic diagram of the base plate in some embodiments of this utility model;

[0022] Figure 3 This is an exploded view of the first side plate in some embodiments of the present invention;

[0023] Figure 4 This is a structural schematic diagram of the second side plate (third side plate) in some embodiments of this utility model;

[0024] Figure 5 This is a structural schematic diagram of the fifth side plate in some embodiments of this utility model;

[0025] Figure 6 This is a schematic diagram of the inclined plate in some embodiments of this utility model;

[0026] Figure 7 This is a schematic diagram showing the dimensions of the cover plate in some embodiments of this utility model;

[0027] Figure 8 This is a schematic diagram showing the dimensions of the base plate in some embodiments of this utility model;

[0028] Figure 9 This is a schematic diagram showing the dimensions of the outer plate (inner plate) in some embodiments of this utility model;

[0029] Figure 10 This is a schematic diagram showing the dimensions of the intermediate plate in some embodiments of this utility model;

[0030] Figure 11 This is a schematic diagram showing the dimensions of the connecting plate in some embodiments of this utility model;

[0031] Figure 12 This is a schematic diagram showing the dimensions of the flange plate in some embodiments of this utility model;

[0032] Figure 13 This is a schematic diagram showing the dimensions of the second side plate (third side plate) in some embodiments of this utility model;

[0033] Figure 14 This is a schematic diagram showing the dimensions of the fifth side plate in some embodiments of this utility model;

[0034] Figure 15 This is a schematic diagram showing the dimensions of the inclined plate in some embodiments of this utility model;

[0035] Figure 16 This is a schematic diagram showing the dimensions of the cover plate in some embodiments of this utility model. Detailed Implementation

[0036] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0037] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0039] See Figures 1 to 7 This utility model discloses a grinding box for radioactive valve cores in nuclear power plants, which can be used for grinding and replacing packing bottom rings after the disassembly of radioactive valves in nuclear power plants.

[0040] like Figure 1 As shown, the nuclear power plant radioactive valve core grinding box may include a box body 10 and a cover plate 20. The box body 10 is cylindrical and includes a bottom plate 11, a first side plate 12, a second side plate 13, a third side plate 14, a fourth side plate 15, and a fifth side plate 16.

[0041] like Figure 2 As shown, the base plate 11 is pentagonal and includes a first side 111, a second side 112, a third side 113, a fourth side 114 and a fifth side 115 connected in sequence. The fifth side 115 is disposed opposite to the connection between the second side plate 13 and the third side plate 14.

[0042] The first side plate 12, the second side plate 13, the third side plate 14, the fourth side plate 15, and the fifth side plate 16 are respectively perpendicularly connected to the first side 111, the second side 112, the third side 113, the fourth side 114, and the fifth side 115. The housing 10 also includes an inclined plate 17, which connects the adjacent parts of the first side plate 12, the fourth side plate 15, and the fifth side plate 16. The inclined plate 17 can form a leaning structure or a horizontal structure, so that the upper body of the staff, such as the chest, can lean on the inclined plate 17, so that the staff can rest appropriately during the grinding of the radioactive valve core in the nuclear power plant and avoid fatigue caused by long-term high-intensity grinding work.

[0043] The first side plate 12 and the fourth side plate 15 are respectively provided with operating gloves. One end of the cover plate 20 is rotatably connected to the second side plate 13 or the third side plate 14. A sealing strip may be provided around the cover plate 20 to improve the sealing performance.

[0044] In some embodiments, both the first side plate 12 and the fourth side plate 15 are pentagonal plates, with the inclined edge of the first side plate 12 facing the fourth side plate 15 and the inclined edge of the fourth side plate 15 facing the first side plate 12. The inclined plate 17 is a pentagonal plate or an isosceles trapezoidal plate. The inclined plate 17 connects the inclined edge of the first side plate 12, the inclined edge of the fourth side plate 15, and the upper side edge of the fifth side plate 16.

[0045] In some embodiments, the second side plate 13 and the third side plate 14 have the same structure.

[0046] In some embodiments, the first side plate 12 and the fourth side plate 15 have the same structure. The structure of the first side plate 12 is described below, and the fourth side plate 15 can be implemented according to the structure of the first side plate 12.

[0047] like Figure 3 As shown, the first side panel 12 includes an outer panel 121, a middle panel 122, and an inner panel 123 assembled sequentially from the outside in. The outer panel 121 and the inner panel 123 have the same structure. Both the outer panel 121 and the inner panel 123 are provided with a first through hole A. The middle panel 122 is provided with a second through hole B. The inner diameter of the second through hole B is larger than the inner diameter of the first through hole A. The second through hole B defines a movable cavity. The first side panel 12 also includes a connecting plate 124 installed in the movable cavity. The connecting plate 124 is connected to the cuff end of the operating glove.

[0048] Continue reading Figure 3 The nuclear power plant's radioactive valve core grinding box also includes a flange plate 125, which, along with the connecting plate 124, is connected to the cuff end of the operating glove. Furthermore, the flange plate 125 and the connecting plate 124 are connected to the cuff end of the operating glove via fasteners. The connecting plate 124 has a third through hole C, and the flange plate 125 has a fourth through hole D, with the third through hole C and the fourth through hole D communicating with each other.

[0049] The connecting plate 124 is provided with a plurality of first connecting holes 1241, and the flange plate 125 is provided with a plurality of second connecting holes 1251. The cuff of the operating glove can be located between the connecting plate 124 and the flange plate 125. Fasteners connect the first connecting holes 1241, the cuff of the operating glove and the second connecting holes 1251 to fix the operating glove and improve the sealing of the connection of the operating glove. In addition, the operating glove can have a certain range of motion and can meet the 360-degree rotation within the limited displacement of the arm.

[0050] In some embodiments, the fastener includes a bolt and nut combination. Alternatively, the fastener includes a screw. Of course, the cuff of the operating glove can also be heat-fused to the connecting plate 124.

[0051] In some embodiments, the operating glove includes, but is not limited to, long-arm latex gloves.

[0052] In some embodiments, the outer plate 121, the middle plate 122, and the inner plate 123 are bonded together with a strong adhesive V-3206, and the connecting plate 124 is embedded in the inner cavity of the middle plate 122. The connecting plate 124 can move freely in the inner cavity of the middle plate 122 along the inner ring of the inner cavity (inner ring) as a motion track.

[0053] In some embodiments, one end of the cover plate 20 is connected to the second side plate 13 or the third side plate 14 via a hinge or hinge 30. The cover plate 20 is also a pentagonal structure. When grinding is required, the cover plate 20 can be opened, the part to be ground can be placed inside the housing 10, the cover plate 20 can be closed, and then the operator can put their hands into operating gloves to perform the grinding operation.

[0054] In some embodiments, the housing 10 and the cover 20 are made of a transparent material to facilitate direct observation of the grinding process. This transparent material includes, but is not limited to, plexiglass.

[0055] like Figure 8 As shown, in some embodiments, the base plate 11 is made of 0.5cm thick plexiglass, and its structure is roughly a square with a side length of 49cm, with one corner cut off to form a regular pentagon with an isosceles right angle and a side length of 7cm.

[0056] like Figure 9 As shown, in some embodiments, the outer plate 121 and the inner plate 123 are both square acrylic sheets with a thickness of 0.33cm and a side length of 42cm, with one corner cut off at a right angle. The side lengths of the right angle are 8cm and 9cm, respectively. The first through hole A is a circular hole with a radius of 10cm.

[0057] like Figure 10 As shown, in some embodiments, the intermediate plate 122 has the following specifications: a square acrylic sheet with a thickness of 0.33cm and a side length of 42cm, wherein a right angle is cut off at one corner, with the side lengths of the right angle being 8cm and 9cm respectively. The second through hole B is a circular hole with a radius of 17cm.

[0058] like Figure 11 As shown, in some embodiments, the connecting plate 124 is annular, made of 0.3cm thick plexiglass, with an inner radius of 5.5cm and an outer radius of 14cm. Four circular holes with an inner diameter of 0.25cm are evenly distributed 0.75cm from the outer edge of the inner diameter.

[0059] like Figure 12 As shown, in some embodiments, the flange plate 125 is annular, made of 0.3cm thick plexiglass, with an inner radius of 5.5cm and an outer radius of 7cm. Four circular holes with an inner diameter of 0.25cm are evenly distributed 0.75cm from the outer edge of the inner diameter.

[0060] like Figure 13 As shown, in some embodiments, the second side plate 13 and the third side plate 14 are both rectangular plates with dimensions of 49cm in length, 42cm in width, and 0.5cm in thickness, and are made of plexiglass.

[0061] like Figure 14As shown, in some embodiments, the fifth side plate 16 is a rectangular plate with the following dimensions: length 33cm (or 33.5cm), width 9.9cm, and thickness 0.5cm.

[0062] like Figure 15 As shown, in some embodiments, the inclined plate 17 is made of plexiglass, which is approximately an isosceles trapezoid with an upper base of 9.9 cm, a lower base of 21.2 cm, a height of 10.7 cm, and a thickness of 0.5 cm.

[0063] like Figure 16 As shown, in some embodiments, the cover plate 20 is made of plexiglass with a side length of 49cm and a thickness of 0.5cm, and a corner is cut off from each of its two adjacent sides to form an isosceles triangle (the right angle side is 15cm).

[0064] In some embodiments, 5mm thick plexiglass is selected to make several 50mm long square prisms. The above-mentioned boards are connected with adhesive V-3206 according to the corresponding dimensions. The inner connection of the nuclear power plant radioactive valve core grinding box is fixed with square prisms evenly distributed, and sealing strips can be pasted on the edges to improve the sealing performance.

[0065] Of course, the size of the radioactive valve core grinding box for this nuclear power plant can be selected according to actual needs, and no specific limit is made here.

[0066] This nuclear power plant radioactive valve core grinding box can be used for grinding and replacing packing bottom rings after the radioactive valves in a nuclear power plant have been disassembled.

[0067] During the grinding of radioactive valve cores at the nuclear power plant, the aerosols inside the grinding chamber were always under control, and the risk of surface contamination for workers was kept under control.

[0068] The nuclear power plant's radioactive valve core grinding box has the following advantages:

[0069] (1) Reduce the layout of the on-site grinding area and save labor and site layout costs.

[0070] (2) Save on investment in protective equipment and reduce the output of radioactive waste (the cost of purchasing protective equipment per person is 45 yuan, and the cost of disposing of protective equipment is 370 yuan. Taking the N207 overhaul as an example, the cost of the high-pressure valve alone can be reduced by 100,000 yuan).

[0071] (3) Effectively control the risk of site and personnel pollution, and reduce the manpower input and waste output for site decontamination.

[0072] (4) Select low-radiation areas for operation to reduce the collective dose (a single overhaul can optimize the collective dose by 12 man.mSv).

[0073] (5) Effectively control valve components to prevent the generation of foreign objects.

[0074] (6) The nuclear power plant’s radioactive valve core grinding box incorporates the curved lines of the human body during operation. By setting up an inclined plate 17, it provides support for the upper body, reduces work fatigue, and improves work efficiency.

[0075] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A grinding box for radioactive valve cores in nuclear power plants, characterized in that, The enclosure includes a housing (10) and a cover plate (20). The housing (10) is cylindrical and includes a bottom plate (11), a first side plate (12), a second side plate (13), a third side plate (14), a fourth side plate (15), and a fifth side plate (16). The bottom plate (11) is pentagonal and includes a first side (111), a second side (112), a third side (113), a fourth side (114), and a fifth side (115) connected in sequence. The fifth side (115) is positioned opposite to the connection between the second side plate (13) and the third side plate (14). The first side panel (12), the second side panel (13), the third side panel (14), the fourth side panel (15), and the fifth side panel (16) are perpendicularly connected to the first side edge (111), the second side edge (112), the third side edge (113), the fourth side edge (114), and the fifth side edge (115), respectively; the box body (10) also includes an inclined plate (17), which connects the adjacent portions of the first side panel (12), the fourth side panel (15), and the fifth side panel (16); the first side panel (12) and the fourth side panel (15) are respectively provided with operating gloves; One end of the cover plate (20) is rotatably connected to the second side plate (13) or the third side plate (14).

2. The nuclear power plant radioactive valve core grinding box according to claim 1, characterized in that, Both the first side plate (12) and the fourth side plate (15) are pentagonal plates. The inclined side of the first side plate (12) is set towards the fourth side plate (15), and the inclined side of the fourth side plate (15) is set towards the first side plate (12). The inclined plate (17) is a pentagonal plate or an isosceles trapezoidal plate. The inclined plate (17) connects the inclined edge of the first side plate (12), the inclined edge of the fourth side plate (15), and the upper side of the fifth side plate (16).

3. The nuclear power plant radioactive valve core grinding box according to claim 1, characterized in that, The second side plate (13) and the third side plate (14) have the same structure.

4. The nuclear power plant radioactive valve core grinding box according to claim 1, characterized in that, The first side plate (12) and the fourth side plate (15) have the same structure.

5. The nuclear power plant radioactive valve core grinding box according to claim 4, characterized in that, The first side plate (12) includes an outer plate (121), a middle plate (122), and an inner plate (123) assembled from the outside to the inside; the outer plate (121) and the inner plate (123) have the same structure, and both the outer plate (121) and the inner plate (123) are provided with a first through hole (A); the middle plate (122) is provided with a second through hole (B), the inner diameter of the second through hole (B) is larger than the inner diameter of the first through hole (A), and the second through hole (B) defines a movable cavity; The first side plate (12) further includes a connecting plate (124) installed in the active cavity, and the connecting plate (124) is connected to the cuff end of the operating glove.

6. The nuclear power plant radioactive valve core grinding box according to claim 5, characterized in that, The nuclear power plant radioactive valve core grinding box also includes a flange plate (125), which, together with the connecting plate (124), is connected to the cuff end of the operating glove.

7. The nuclear power plant radioactive valve core grinding box according to claim 6, characterized in that, The flange plate (125) and the connecting plate (124) are connected to the cuff end of the operating glove by fasteners.

8. The nuclear power plant radioactive valve core grinding box according to claim 7, characterized in that, The fasteners include a combination of bolts and nuts.

9. The nuclear power plant radioactive valve core grinding box according to claim 1, characterized in that, One end of the cover plate (20) is connected to the second side plate (13) or the third side plate (14) by a hinge or hinge (30).

10. The nuclear power plant radioactive valve core grinding box according to claim 1, characterized in that, The box (10) and the cover (20) are made of transparent material.

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