Nuclear power plant valve flange screw hole checking and positioning device

Abstract

The utility model discloses a nuclear power plant valve flange screw hole checking and positioning device which comprises a Y-direction moving mechanism, an X-direction moving mechanism, a rotating mechanism, a tensioning mechanism and a detecting mechanism. The Y-direction moving mechanism comprises a first support and a Y-direction moving assembly, the X-direction moving mechanism comprises a second support and an X-direction moving assembly, and the second support is connected with the Y-direction moving assembly; the rotating mechanism is connected with the first support. The tensioning mechanism is fixed in a hole in the middle of a nuclear power plant valve flange. The detection mechanism is connected with the X-direction moving assembly and comprises a limiting switch and a camera. By acquiring the internal image information of the valve flange screw hole of the nuclear power plant, the inspection of the screw hole can be realized, the positioning of the detection mechanism can also be realized, and compared with manual visual inspection and positioning, the automatic inspection can be realized, the positioning time is shorter, and the efficiency is higher. And when the device is applied to a nuclear power plant, the staying time of an operator in an irradiation area can be greatly shortened, so that the irradiation dose is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a device for checking and positioning screw holes of valve flanges in nuclear power plants. Background Art

[0002] The flange bolts in the primary circuit boundary gate valve of a nuclear power plant belong to the pressure-bearing boundary, which involves nuclear safety. If the valve body bolts are stuck, the valve maintenance period will be extended, affecting the overhaul period and causing great economic losses. For example, serious damage to the valve body screw hole will reduce the service life and reliability of the valve. However, the current inspection of valve screw holes in the nuclear power industry mainly relies on manual work, which is inefficient and costly, and will expose workers to irradiation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a device for checking and positioning screw holes of valve flanges in nuclear power plants.

[0004] The utility model solves the technical problem by adopting the following technical solution: constructing a nuclear power plant valve flange screw hole inspection and positioning device, including a Y-direction moving mechanism, an X-direction moving mechanism, a rotating mechanism, a tensioning mechanism and a detection mechanism;

[0005] The Y-direction moving mechanism comprises a first bracket and a Y-direction moving component arranged on the first bracket, and the X-direction moving mechanism comprises a second bracket and an X-direction moving component arranged on the second bracket, and the second bracket is connected to the Y-direction moving component;

[0006] The rotating mechanism is connected to the first bracket to drive the first bracket to rotate in a circumferential direction, and the tensioning mechanism is connected to the first bracket, and the tensioning mechanism is used to be fixed in the hole in the middle of the valve flange of the nuclear power plant;

[0007] The detection mechanism is connected to the X-direction moving component, and the detection mechanism includes a limit switch and a camera.

[0008] In some embodiments, the first bracket includes a first bottom plate and a first mounting plate vertically connected to the first bottom plate, the Y-direction moving assembly includes a Y-direction linear module, the first bottom plate is connected to the rotating mechanism, and the Y-direction linear module is mounted on the first mounting plate;

[0009] The second bracket includes a second base plate and a second mounting plate vertically connected to the second base plate, the X-direction moving assembly includes an X-direction linear module, the second base plate is connected to a slider of the Y-direction linear module; the X-direction linear module is mounted on the second mounting plate.

[0010] In some embodiments, the detection mechanism further includes a third mounting plate, a hollow rotating platform, a buffer assembly, a work station frame, and a detection assembly;

[0011] The hollow rotating platform is connected to the slider of the X-axis linear module through the third mounting plate, the hollow rotating platform is connected to the buffer assembly, the buffer assembly is connected to the work station frame, the detection assembly is connected to the work station frame, and the detection assembly includes the limit switch and the camera.

[0012] In some embodiments, the buffer assembly includes a base plate, a guide shaft, and an elastic member;

[0013] The workstation frame comprises a first fixed plate, a second fixed plate, and a connecting plate; the first fixed plate and the second fixed plate are arranged in parallel with each other, and the connecting plate connects the first fixed plate and the second fixed plate;

[0014] The base plate is located above the first fixing plate, the upper end of the guide shaft is connected to the base plate, the lower end of the guide shaft is connected to the first fixing plate and relatively fixed, and the elastic member is arranged between the base plate and the first fixing plate;

[0015] The detection component is connected to the second fixing plate.

[0016] In some embodiments, the number of the guide shafts is multiple, and the multiple guide shafts are arranged at intervals along the center of the substrate;

[0017] The elastic member comprises a coil spring, and the coil spring is sleeved on a portion of the guide shaft located between the base plate and the first fixing plate.

[0018] In some embodiments, the detection assembly further comprises a mounting rod, the upper end of the mounting rod is connected to the second fixing plate, and the lower end of the mounting rod is provided with a mounting block;

[0019] The limit switch and the camera are arranged on the mounting block.

[0020] In some embodiments, the mounting block includes a columnar portion and a conical portion, the upper end of the columnar portion is connected to the lower end of the mounting rod, the upper end of the conical portion is connected to the lower end of the columnar portion, the camera is arranged at the bottom of the conical portion; the limit switch is arranged on the circumferential side of the columnar portion.

[0021] In some embodiments, the circumferential side surface of the columnar portion has a mounting plane, and the limit switch is mounted on the mounting plane.

[0022] In some embodiments, the second fixing plate is provided with a plurality of mounting holes, and the mounting rod is installed in one of the mounting holes.

[0023] In some embodiments, the plurality of mounting holes are evenly distributed on a circle with the center of the second fixing plate as the center.

[0024] In some embodiments, the tensioning mechanism includes a fixed body, a tensioning block, a connecting rod, and a hand wheel, wherein the connecting rod is passed through the first bottom plate, and the upper end of the connecting rod is connected to the hand wheel, and the lower end of the connecting rod is provided with a cone;

[0025] The fixed body has a receiving groove, and a plurality of through holes are arranged on the circumferential side of the fixed body. The tension block is movably installed in the through hole, and the cone is installed in the receiving groove to drive the tension block to move along the through hole so that the fixed body is fixed in the hole in the middle of the valve flange of the nuclear power plant.

[0026] In some embodiments, the connecting rod is provided with a third fixing plate and a mounting boss, and the third fixing plate and the mounting boss are arranged at intervals in the height direction; the first bottom plate is sleeved on the mounting boss; the rotating mechanism includes a rotating motor, a driving wheel and a driven wheel;

[0027] The rotating motor is mounted on the third fixing plate, the driven wheel is mounted on the first bottom plate, the driving wheel and the driven wheel are meshed with each other, and the output end of the rotating motor is connected to the driving wheel.

[0028] The implementation of the utility model has the following beneficial effects: the nuclear power plant valve flange screw hole inspection and positioning device can realize the inspection of the screw hole by obtaining the internal image information of the nuclear power plant valve flange screw hole. In addition, the positioning of the detection mechanism can be realized through the image information. Compared with manual visual inspection and positioning, automatic inspection can be realized, and the positioning time is shorter, the positioning accuracy is higher, and when used in a nuclear power plant, the operator's stay time in the irradiation area can be greatly shortened, thereby reducing the irradiation dose. The nuclear power plant valve flange screw hole inspection and positioning device can be equipped with other screw hole repair tools. After the screw hole positioning is realized, the nuclear power plant valve flange screw hole can be repaired. The nuclear power plant valve flange screw hole inspection and positioning device has a simple structure, is easy to install, is easy to adjust the position, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the utility model, the 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 certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0030] Figure 1This is one of the application schematic diagrams of the nuclear power plant valve flange screw hole inspection and positioning device in some embodiments of the utility model;

[0031] Figure 2 It is one of the structural schematic diagrams of the nuclear power plant valve flange screw hole inspection and positioning device and the nuclear power plant valve flange in some embodiments of the utility model;

[0032] Figure 3 This is the second structural schematic diagram of the nuclear power plant valve flange screw hole inspection and positioning device and the nuclear power plant valve flange in some embodiments of the utility model;

[0033] Figure 4 It is a schematic diagram of the structure of the tensioning mechanism in some embodiments of the utility model;

[0034] Figure 5 It is a schematic diagram of the structure of the coordination between the fixed body and the tensioning block in the tensioning mechanism in some embodiments of the utility model;

[0035] Figure 6 It is a schematic diagram of the structure of the buffer mechanism in some embodiments of the utility model;

[0036] Figure 7 It is one of the structural schematic diagrams of the workstation frame in some embodiments of the utility model;

[0037] Figure 8 This is the second structural schematic diagram of the workstation frame in some embodiments of the utility model;

[0038] Fig. 9 It is a schematic diagram of the structure of the detection component in some embodiments of the utility model. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0040] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0041] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0042] See also Figures 1 to 3 The utility model shows a nuclear power plant valve flange screw hole inspection and positioning device, including a Y-direction moving mechanism 10, an X-direction moving mechanism 20, a rotating mechanism 30, a tensioning mechanism 40 and a detection mechanism 50.

[0043] The Y-direction moving mechanism 10 includes a first bracket 11 and a Y-direction moving assembly 12 disposed on the first bracket 11 . The X-direction moving mechanism 20 includes a second bracket 21 and an X-direction moving assembly 22 disposed on the second bracket 21 . The second bracket 21 is connected to the Y-direction moving assembly 12 .

[0044] The rotating mechanism 30 is connected to the first bracket 11 to drive the first bracket 11 to rotate along the circumferential direction. The tensioning mechanism 40 is connected to the first bracket 11 and is used to be fixed in the hole 101 in the middle of the valve flange 100 of the nuclear power plant.

[0045] The detection mechanism 50 is connected to the X-direction moving assembly 22 . The detection mechanism 50 includes a limit switch 551 and a camera 552 , which are used to detect image information in the screw hole 102 of the valve flange of the nuclear power plant.

[0046] In some embodiments, the first bracket 11 is generally L-shaped, and may include a first bottom plate 111 and a first mounting plate 112 vertically connected to the first bottom plate 111. The first bracket 11 may also be provided with a plurality of reinforcing ribs to enhance the overall strength of the first bracket 11. The Y-direction moving assembly 12 includes a Y-direction linear module, the first bottom plate 111 is connected to the rotating mechanism 30, and the Y-direction linear module is mounted on the first mounting plate 112. The Y-direction linear module model can be GTB8-L5-150-BC-M20-C4.

[0047] In some embodiments, the second bracket 21 is generally L-shaped, including a second bottom plate 211 and a second mounting plate 212 vertically connected to the second bottom plate 211. The second bracket 21 may also be provided with a plurality of reinforcing ribs to enhance the overall strength of the second bracket 21. The X-direction moving assembly 22 includes an X-direction linear module, and the second bottom plate 211 is connected to a slider of a Y-direction linear module; the X-direction linear module is mounted on the second mounting plate 212. The model of the X-direction linear module can be GTB8-L5-150-BC-M20-C4.

[0048] Combination Figure 4 and Figure 5 In some embodiments, the tensioning mechanism 40 includes a fixed body 41, a tensioning block 42, a connecting rod 43, and a hand wheel 44. The connecting rod 43 is penetrated through the first bottom plate 111, and the upper end of the connecting rod 43 is connected to the hand wheel 44, and the lower end of the connecting rod 43 is provided with a cone 45; the fixed body 41 has a receiving groove 411, and a plurality of through holes 412 are provided on the circumferential side of the fixed body 41. The tensioning block 42 is movably installed in the through hole 412, and the cone 45 is installed in the receiving groove 411 to drive the tensioning block 42 to move along the through hole 412, so that the fixed body 41 is fixed in the hole 101 in the middle of the valve flange 100 of the nuclear power plant. For example, when the hand wheel 44 drives the connecting rod 43 to move downward, the cone 45 can be driven to move downward. At this time, the inclined surface of the cone 45 and the inclined surface of the tension block 42 are pressed against each other, so that the tension block 42 moves radially outward, thereby fixing the tensioning mechanism 40 in the hole 101. Preferably, the connecting rod 43 can be a screw structure, and the upper end of the fixed body 41 is provided with a screw hole to be threadedly connected with the connecting rod 43. Preferably, the tension blocks 42 can be arranged three at intervals. Of course, the tension blocks 42 can also be arranged in other numbers, which are not specifically limited here.

[0049] In some embodiments, a third fixing plate 431 and a mounting boss 432 are provided on the connecting rod 43, and the third fixing plate 431 and the mounting boss 432 are arranged at an interval in the height direction; the first base plate 111 is sleeved on the mounting boss 432; the rotating mechanism 30 includes a rotating motor 31, a driving wheel 32 and a driven wheel 33; the rotating motor 31 is installed on the third fixing plate 431, and the driven wheel 33 is installed on the first base plate 111. The driving wheel 32 can be arranged on the lower side of the third fixing plate 431, and the driving wheel 32 and the driven wheel 33 are meshed with each other. The output end of the rotating motor 31 is passed through the third fixing plate 431 to be connected with the driving wheel 32. When the rotating motor 31 rotates, the driven wheel 33 is driven to rotate through the driving wheel 32, and then the first base plate 111 is driven to rotate, and then the entire Y-direction moving component 12 is driven to rotate, and finally the position adjustment of the detection mechanism 50 is realized.

[0050] Combination Figures 1 to 3 As shown, in some embodiments, the detection mechanism 50 also includes a third mounting plate 51 , a hollow rotating platform 52 , a buffer assembly 53 , a work station frame 54 and a detection assembly 55 .

[0051] The hollow rotating platform 52 is connected to the slider of the X-axis linear module through the third mounting plate 51 to achieve position adjustment in the X direction. The hollow rotating platform 52 can be connected to the buffer assembly 53, the buffer assembly 53 is connected to the station frame 54, and the detection assembly 55 is connected to the station frame 54. The detection assembly 55 includes a limit switch 551 and a camera 552. Preferably, the hollow rotating platform 52 can be selected as model Y200RA100.

[0052] Combination Figure 6 , Figure 7 and Figure 8 In some embodiments, the buffer assembly 53 may include a base plate 531, a guide shaft 532, and an elastic member 533; the work station frame 54 may include a first fixed plate 541, a second fixed plate 542, and a connecting plate 543; the first fixed plate 541 and the second fixed plate 542 are arranged in parallel with each other, and the connecting plate 543 connects the first fixed plate 541 and the second fixed plate 542.

[0053] The base plate 531 is located above the first fixing plate 541, the upper end of the guide shaft 532 is connected to the base plate 531, the lower end of the guide shaft 532 is connected to the first fixing plate 541 and relatively fixed, and the elastic member 533 is arranged between the base plate 531 and the first fixing plate 541; the detection assembly 55 is connected to the second fixing plate 542. Preferably, the first fixing plate 541 is provided with a plurality of fixing holes 5411, the lower end of the guide shaft 532 can be inserted into the fixing holes 5411, and the lower end of the guide shaft 532 is provided with a limiting protrusion, so that the guide shaft 532 will not fall out of the first fixing plate 541.

[0054] Preferably, the number of the guide shafts 532 is multiple, and the multiple guide shafts 532 are arranged at intervals along the center of the substrate 531; the elastic member 533 may include a coil spring, and the coil spring is sleeved on the portion of the guide shaft 532 located between the substrate 531 and the first fixing plate 541. Preferably, the number of the guide shafts 532 may be multiple (such as four), and the multiple guide shafts 532 are installed on the substrate 531 and are evenly distributed on a circle with the center of the substrate 531 as the center. The buffer component 53 is used to buffer the reaction force caused by the detection component 55 hitting the surface of the valve flange 100 of the nuclear power plant due to improper operation.

[0055] like Fig. 9 As shown, in some embodiments, the detection component 55 also includes a mounting rod 553, the upper end of the mounting rod 553 is connected to the second fixed plate 542, and the lower end of the mounting rod 553 is provided with a mounting block 554, and the mounting block 554 can be fixedly connected to the mounting rod 553 or detachably connected; the limit switch 551 and the camera 552 are arranged on the mounting block 554.

[0056] In some embodiments, the mounting block 554 may include a columnar portion 5541 and a conical portion 5542. The columnar portion 5541 may be substantially cylindrical, and its radius is slightly smaller than the radius of the screw hole 102 of the valve flange of the nuclear power plant to be cleaned. The upper end of the columnar portion 5541 is connected to the lower end of the mounting rod 553, and the upper end of the conical portion 5542 is connected to the lower end of the columnar portion 5541. The camera 552 is arranged at the bottom of the conical portion 5542. The conical portion 5542 may be coaxial with the mounting rod 553, and the camera 552 may be arranged at the axial position of the mounting block 554; the limit switch 551 is arranged on the circumferential side of the columnar portion 5541. When the mounting block 554 is inserted into the screw hole 102 of the nuclear power plant valve flange and the limit switch 551 is triggered, it indicates that the positioning is completed. The camera 552 is used to upload the shape of the screw hole 102 of the nuclear power plant valve flange to the industrial computer. The camera 552 can be provided with a wireless communication module.

[0057] Preferably, the circumferential side surface of the columnar portion 5541 has a mounting plane 5541a, and the limit switch 551 is mounted on the mounting plane 5541a.

[0058] In some embodiments, the second fixing plate 542 is provided with a plurality of mounting holes 5421 (eg Figure 8 As shown in the figure, the mounting rod 553 is installed in one of the mounting holes 5421. The mounting rod 553 can be fixedly connected to the mounting hole 5421 or detachably connected, and the detachable connection can include threaded connection fixation.

[0059] In some embodiments, the plurality of mounting holes 5421 are evenly distributed on a circle with the center of the second fixing plate 542 as the center. The mounting holes 5421 can be used for installing screw hole repair tools. When the hollow rotating platform 52 drives the work station 54 to rotate, the screw hole repair tools can be switched.

[0060] The nuclear power plant valve flange screw hole inspection and positioning device can realize the inspection of the screw hole by obtaining the internal image information of the nuclear power plant valve flange screw hole 102. In addition, the detection mechanism can be positioned through the image information. Compared with manual visual inspection and positioning, automatic inspection can be realized, and the positioning time is shorter. The positioning of the detection mechanism 50 can be realized. Compared with manual visual positioning, the positioning time is shorter and the positioning accuracy is higher. When used in a nuclear power plant, the operator's stay time in the irradiation area can be greatly shortened, thereby reducing the irradiation dose. In addition, the image information obtained can be used for the operator to understand the damage of the screw hole, so as to facilitate subsequent targeted repair. The nuclear power plant valve flange screw hole inspection and positioning device can be equipped with other screw hole repair tools. After the screw hole positioning is realized, the nuclear power plant valve flange screw hole 102 can be repaired.

[0061] The nuclear power plant valve flange screw hole inspection and positioning device has a simple structure, is easy to install, is convenient to adjust the position, and is highly practical.

[0062] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A device for checking and positioning screw holes of valve flanges in nuclear power plants, characterized in that: It comprises a Y-direction moving mechanism (10), an X-direction moving mechanism (20), a rotating mechanism (30), a tensioning mechanism (40) and a detection mechanism (50); The Y-direction moving mechanism (10) comprises a first bracket (11) and a Y-direction moving component (12) arranged on the first bracket (11); the X-direction moving mechanism (20) comprises a second bracket (21) and an X-direction moving component (22) arranged on the second bracket (21); the second bracket (21) is connected to the Y-direction moving component (12); The rotating mechanism (30) is connected to the first bracket (11) to drive the first bracket (11) to rotate in a circumferential direction, and the tensioning mechanism (40) is connected to the first bracket (11), and the tensioning mechanism (40) is used to be fixed in a hole in the middle of a valve flange (100) of a nuclear power plant; The detection mechanism (50) is connected to the X-direction moving component (22), and the detection mechanism (50) comprises a limit switch (551) and a camera (552).

2. The nuclear power plant valve flange screw hole inspection and positioning device according to claim 1 is characterized in that: The first bracket (11) comprises a first base plate (111) and a first mounting plate (112) vertically connected to the first base plate (111); the Y-direction moving component (12) comprises a Y-direction linear module; the first base plate (111) is connected to the rotating mechanism (30); and the Y-direction linear module is mounted on the first mounting plate (112); The second bracket (21) comprises a second base plate (211) and a second mounting plate (212) vertically connected to the second base plate (211); the X-direction moving assembly (22) comprises an X-direction linear module; the second base plate (211) is connected to a slider of the Y-direction linear module; and the X-direction linear module is mounted on the second mounting plate (212).

3. The nuclear power plant valve flange screw hole inspection and positioning device according to claim 2 is characterized in that: The detection mechanism (50) further comprises a third mounting plate (51), a hollow rotating platform (52), a buffer assembly (53), a work station frame (54) and a detection assembly (55); The hollow rotating platform (52) is connected to the slider of the X-axis linear module via the third mounting plate (51); the hollow rotating platform (52) is connected to the buffer assembly (53); the buffer assembly (53) is connected to the work station frame (54); the detection assembly (55) is connected to the work station frame (54); and the detection assembly (55) comprises the limit switch (551) and the camera (552).

4. The device for inspecting and positioning screw holes of valve flanges in nuclear power plants according to claim 3, characterized in that: The buffer component (53) comprises a base plate (531), a guide shaft (532), and an elastic member (533); The workstation frame (54) comprises a first fixing plate (541), a second fixing plate (542), and a connecting plate (543); the first fixing plate (541) and the second fixing plate (542) are arranged in parallel with each other, and the connecting plate (543) connects the first fixing plate (541) and the second fixing plate (542); The base plate (531) is located above the first fixing plate (541), the upper end of the guide shaft (532) is connected to the base plate (531), the lower end of the guide shaft (532) is connected to and relatively fixed to the first fixing plate (541), and the elastic member (533) is provided between the base plate (531) and the first fixing plate (541); The detection component (55) is connected to the second fixing plate (542).

5. The device for inspecting and positioning screw holes of valve flanges in nuclear power plants according to claim 4, characterized in that: The number of the guide shafts (532) is multiple, and the multiple guide shafts (532) are arranged at intervals along the center of the substrate (531); The elastic member (533) comprises a coil spring, and the coil spring is sleeved on a portion of the guide shaft (532) located between the base plate (531) and the first fixing plate (541).

6. The device for inspecting and positioning screw holes of valve flanges in nuclear power plants according to claim 5, characterized in that: The detection assembly (55) further comprises a mounting rod (553), the upper end of the mounting rod (553) being connected to the second fixing plate (542), and the lower end of the mounting rod (553) being provided with a mounting block (554); The limit switch (551) and the camera (552) are arranged on the mounting block (554).

7. The device for inspecting and positioning screw holes of valve flanges in nuclear power plants according to claim 6, characterized in that: The mounting block (554) comprises a columnar portion (5541) and a conical portion (5542), the upper end of the columnar portion (5541) being connected to the lower end of the mounting rod (553), the upper end of the conical portion (5542) being connected to the lower end of the columnar portion (5541), the camera (552) being arranged at the bottom of the conical portion (5542); and the limit switch (551) being arranged on the circumferential side of the columnar portion (5541).

8. The device for inspecting and positioning screw holes of valve flanges in nuclear power plants according to claim 7, characterized in that: The circumferential side surface of the columnar portion (5541) has a mounting plane (5541a), and the limit switch (551) is mounted on the mounting plane (5541a).

9. The nuclear power plant valve flange screw hole inspection and positioning device according to claim 8, characterized in that: The second fixing plate (542) is provided with a plurality of mounting holes (5421), and the mounting rod (553) is mounted in one of the mounting holes (5421).

10. The nuclear power plant valve flange screw hole inspection and positioning device according to claim 9, characterized in that: The plurality of mounting holes (5421) are evenly distributed on a circle with the center of the second fixing plate (542) as the center.

11. The device for inspecting and positioning screw holes of valve flanges in nuclear power plants according to any one of claims 2 to 10, characterized in that: The tensioning mechanism (40) comprises a fixed body (41), a tensioning block (42), a connecting rod (43), and a hand wheel (44); the connecting rod (43) is inserted through the first bottom plate (111), and the upper end of the connecting rod (43) is connected to the hand wheel (44); the lower end of the connecting rod (43) is provided with a cone (45); The fixed body (41) has a receiving groove (411), and a plurality of through holes (412) are provided on the circumferential side surface of the fixed body (41). The tension block (42) is movably installed in the through hole (412), and the cone (45) is installed in the receiving groove (411) to drive the tension block (42) to move along the through hole (412), so that the fixed body (41) is fixed in the hole in the middle of the nuclear power plant valve flange (100).

12. The nuclear power plant valve flange screw hole inspection and positioning device according to claim 11, characterized in that: The connecting rod (43) is provided with a third fixing plate (431) and a mounting boss (432), and the third fixing plate (431) and the mounting boss (432) are arranged at an interval in the height direction; the first bottom plate (111) is sleeved on the mounting boss (432); the rotating mechanism (30) comprises a rotating motor (31), a driving wheel (32) and a driven wheel (33); The rotating motor (31) is mounted on the third fixing plate (431), the driven wheel (33) is mounted on the first bottom plate (111), the driving wheel (32) and the driven wheel (33) are meshed with each other, and the output end of the rotating motor (31) is connected to the driving wheel (32).

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