A nuclear power plant core support plate angle detector

Abstract

The present invention discloses an angle detector for a core support plate of a nuclear power plant, comprising a core support plate and an angle detector. The angle detector comprises a first detection member, a second detection member, and a drive assembly support member. The first detection member is composed of a first mounting portion, a first mounting plate, a first cylinder, a first annular body, and a first bottom plate; the second detection member is composed of an insert, a second annular body, and a second bottom plate; and a fixed disk, a drive member, an adjustment member, and an electromagnetic member are provided in the drive assembly. The angle detector for the core support plate of a nuclear power plant can realize the rotation angle monitoring of the core support plate through the cooperation of the first detection body and the second detection body. When the radial angle of the core support plate changes, the first detection member and the second detection member will not contact or the contact pressure will be too large. When the inclination angle of the core support plate changes, the first elastic sheet and the second elastic sheet will undergo elastic deformation at this time, thereby realizing the angle monitoring of the core support plate.

Description

Technical Field

[0001] The invention relates to sensor technology, and in particular to an angle detector for a core support plate of a nuclear power plant. Background Art

[0002] The principle of a nuclear power plant is to generate electricity by using the energy released by nuclear fission reactions. During the operation of a nuclear power plant, a positioning pin is installed on the upper surface of the core support plate under the core to cooperate with the lower tube seat of the fuel assembly. The fuel assembly is located at each position on the upper surface of the core support plate under the core through the positioning pin. After the fuel assembly is fully seated, the bottom of its lower tube seat will be in full contact with the upper surface of the core support plate under the core. If the angle of the lower core support plate changes, the fuel assembly will tilt toward the surrounding fuel group, causing the fuel assembly to be squeezed laterally, thereby damaging the fuel assembly. During the operation of a nuclear power plant, the core support plate under the core is in a high gamma-ray radiation environment for a long time, and its material will undergo activation, creep, and micro-deformation, which will change the overall angle of the upper surface of the lower core support plate; during the overhaul, when hoisting the lower internal components, collisions and falling foreign objects will also have a certain impact on the overall angle of the core support plate under the core.

[0003] At present, during the refueling overhaul, the refueling personnel of the nuclear power plant will visually observe the angle of the core support plate under the core through underwater television. Visual observation is a qualitative evaluation method. It can only observe whether there are foreign objects on the upper surface of the core support plate under the core and roughly estimate the deformation that can be recognized by the human eye. It cannot effectively observe the small deformation such as the change of flatness. The fuel assembly is 4 to 5 meters high. This small deformation will have a great impact on the verticality of the fuel assembly after it is placed. In addition, the standards of visual observers in various nuclear power plants are different. The effectiveness of the observation and judgment conclusions is heavily dependent on the judgment experience of the observers, which poses a potential risk to the safety of nuclear power plant fuel operation. Summary of the invention

[0004] In order to solve the defects of the above-mentioned prior art, the present invention proposes a nuclear power plant core support plate angle detector.

[0005] The technical solution of the present invention is achieved in this way:

[0006] A nuclear power plant core support plate angle detector, characterized by comprising:

[0007] A core support plate, wherein a positioning hole is provided in the middle of the core support plate.

[0008] An angle detector is arranged at the lower end of the core support plate, and the angle detector is arranged in a positioning hole in the middle of the core support plate. The angle detector is used to detect the rotation angle and tilt angle of the core support plate. The angle detector includes:

[0009] The first detection member is composed of a first mounting portion, a first mounting plate, a first cylinder, a first annular body and a first bottom plate. The first bottom plate connects the first cylinder and the first annular body. A first gap is formed between the first annular body and the first cylinder. A first mounting hole is formed in the middle of the first mounting portion. A detection chamber is formed in the middle of the first cylinder. The lower end of the detection chamber is kept through. The first detection member is arranged on the lower end surface of the core support plate through the first mounting plate.

[0010] The second detection member is composed of an insert, a second annular body and a second bottom plate, a second gap is formed between the insert and the second annular body, the first annular body is arranged in the second gap, a plurality of spacing grooves and annular grooves are arranged in the middle of the insert, the spacing grooves are connected with the annular grooves, the insert is divided into a plurality of first elastic arms by the spacing grooves and the annular grooves, the insert is inserted into the detection chamber from the lower end of the first detection body, a third gap is formed between the insert and the inner wall of the detection chamber, and a driving chamber is formed in the middle of the insert,

[0011] A driving assembly, wherein a fixed disk, a driving member, an adjusting member and an electromagnetic member are provided in the driving assembly, a through hole is provided in the middle of the fixed disk, the driving member is composed of a rod body and a driving body, the adjusting member is composed of a threaded rod and a pushing disk, the threaded rod is provided with a threaded portion, a threaded hole matching the threaded rod is provided in the middle of the rod body, the driving member is arranged in a driving chamber, an elastic member is provided on the rod body, the elastic member is located between the driving body and the pushing disk, the threaded rod is arranged in the through hole,

[0012] And a support member arranged at the lower end of the driving component, the support member is composed of a disk body, a first column body and a second column body from top to bottom, an active chamber is formed between the disk body and the first column body, the diameter of the second column body is smaller than the diameter of the first column, and the electromagnetic member and the pushing disk are arranged at the bottom of the active chamber.

[0013] In the present invention, a vertical annular wall and an inclined annular wall are formed in the detection chamber. The vertical annular wall is arranged at the lower end of the inclined annular wall. The inclined annular wall is in an inverted frustum-shaped structure, which is larger at the top and smaller at the bottom.

[0014] In the present invention, a plurality of first detection bodies are provided on the inner wall of the inclined annular wall, and a first contact surface is provided on the first detection body, and the first contact surface is arranged in an inclined manner.

[0015] In the present invention, a conical head is provided at the upper end of the insert, which is small at the top and large at the bottom. A second detection body that cooperates with the first detection body is provided on the conical head. A second contact surface is provided on the second detection body. The second contact surface is inclined, and its inclination direction and angle cooperate with the second contact surface.

[0016] In the present invention, a first elastic sheet is provided on the first detection body, and a second elastic sheet is provided on the second detection body. The first elastic sheet is arranged at the lower end of the first detection body, and the second elastic sheet is arranged at the upper end of the second detection body. One end of the first elastic sheet remains connected to the first detection body, and the other end is a free end. One end of the second elastic sheet remains connected to the second detection body, and the other end is a free end.

[0017] In the present invention, an annular groove is provided on the first elastic arm.

[0018] In the present invention, a plurality of strip grooves are provided on the second annular body, and the strip grooves divide the second annular body into a plurality of second elastic arms. A fixed end is provided at the upper end of the second elastic arm, and a blocking surface and a guiding inclined surface are provided on the fixed end. A bearing surface cooperating with the blocking surface is provided on the first annular body.

[0019] In the present invention, the driving body is arranged in a frustum, which is small at the top and large at the bottom. The driving body is provided with an annular slope, the upper end of which is provided with a first blocking slope, and the lower end of which is provided with a second blocking slope.

[0020] In the present invention, a conical surface, a first convex portion, a concave surface and a second convex portion are sequentially arranged in the driving chamber from bottom to top, and the concave surface is inclined and matched with the annular inclined surface on the driving body.

[0021] In the present invention, the first protrusion is provided with a first guiding slope, a first protrusion surface and a second guiding slope, the second protrusion is provided with a third guiding slope, a second protrusion surface and a fourth guiding slope, the first blocking slope contacts the third guiding slope, and the second blocking slope cooperates with the second guiding slope.

[0022] The core support plate angle detector of a nuclear power plant implementing the present invention has the following beneficial effects: the core support plate angle detector of a nuclear power plant can realize the rotation angle monitoring of the core support plate through the cooperation of the first detection body and the second detection body, and when the radial angle of the core support plate changes, the first detection member and the second detection member will not contact or the contact pressure will be too large. When the inclination angle of the core support plate changes, the first elastic sheet and the second elastic sheet will undergo elastic deformation, thereby realizing the angle monitoring of the core support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the nuclear power plant core support plate angle detector of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0025] Figure 3for Figure 1 Schematic diagram of the angle detector structure in FIG.

[0026] Figure 4 for Figure 3 A top view of

[0027] Figure 5 for Figure 4 The cross-sectional view at AA in FIG.

[0028] Figure 6 for Figure 3 Exploded diagram of

[0029] Figure 7 for Figure 6 A schematic structural diagram of the first detection component in FIG.

[0030] Figure 8 for Figure 7 A schematic diagram of the structure in another direction;

[0031] Fig. 9 for Figure 8 A local enlarged view of point B in FIG.

[0032] Fig.10 for Figure 7 sectional view of;

[0033] Fig.11 for Fig.10 A local enlarged view of point C in FIG.

[0034] Fig.12 for Figure 6 A schematic diagram of the structure of the second detection member;

[0035] Fig.13 for Fig.12 A schematic diagram of the structure in another direction;

[0036] Fig.14 for Fig.13 A local enlarged view of point D in FIG.

[0037] Fig.15 for Fig.12 sectional view of;

[0038] Fig.16 for Figure 6 Schematic diagram of the support structure in FIG.

[0039] Fig.17 for Figure 6 Schematic diagram of the drive component structure in;

[0040] Fig.18 This is a schematic diagram of the installation state of the first detection member and the second detection member in the present invention;

[0041] Fig.19It is a schematic diagram of the installation status of the second detection member and the driving assembly in the present invention.

[0042] In the figure: core support plate 1, angle detector 2, positioning hole 3, first detection member 4, second detection member 5, drive assembly 6, support member 7, first mounting portion 8, first mounting plate 9, first cylinder 10, first annular body 11, first bottom plate 12, first gap 13, first mounting hole 14, detection chamber 15, vertical annular wall 16, inclined annular wall 17, first elastic arm 18, first contact surface 19, second contact surface 20, first detection body 21, second detection body 22, first elastic sheet 23, second elastic sheet 24, insert body 25, second annular body 26, second bottom plate 27, second gap 28, strip groove 29, second elastic arm 30, fixed end 31, blocking surface 32, guiding inclined surface 33, bearing surface 34, Spacing groove 35, annular groove 36, annular groove 37, conical head 38, third gap 39, drive chamber 40, fixed disk 41, drive member 42, adjustment member 43, electromagnetic member 44, through hole 45, rod body 46, drive body 47, threaded rod 48, push disk 49, threaded portion 50, threaded hole 51, second protrusion 52, concave surface 53, elastic member 54, conical surface 55, first protrusion 56, annular inclined surface 57, first guide inclined surface 58, first protruding surface 59, second guide inclined surface 60, third guide inclined surface 61, second protruding surface 62, fourth guide inclined surface 63, first blocking inclined surface 64, second blocking inclined surface 65, disk body 66, first column 67, second column 68, active chamber 69, stepped opening 70. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0044] like Figures 1 to 19 As shown, the core support plate angle detector of a nuclear power plant of the present invention comprises a core support plate 1 and an angle detector 2. A positioning hole 3 is provided in the middle of the core support plate 1, and the angle detector 2 is arranged at the lower end of the core support plate 1. The angle detector 2 is arranged in the positioning hole 3 in the middle of the core support plate 1, and the angle detector 2 is used to detect the rotation angle and tilt angle of the core support plate 1.

[0045] The angle detector 2 includes a first detection member 4, a second detection member 5, a drive assembly 6 and a support member 7. The first detection member 4 is mounted on the lower end of the core support plate 1, the second detection member 5 is arranged at the lower end of the first detection member 4, and the drive assembly 6 is mounted on the support member 7, and then the drive assembly 6 is arranged inside the second detection member 5.

[0046] The first detection member 4 is composed of a first mounting portion 8, a first mounting plate 9, a first cylinder 10, a first annular body 11 and a first bottom plate 12. The first detection member 4 is used to cooperate with the second detection member 5 to detect the angular deviation of the core support plate 1. Since the first detection member 4 is connected to the core support plate 1, when the angle of the core support plate 1 changes, the angle of the first detection member 4 will also change accordingly.

[0047] The first bottom plate 12 connects the first cylinder 10 and the first annular body 11, and a first gap 13 is formed between the first annular body 11 and the first cylinder 10. A first mounting hole 14 is formed in the middle of the first mounting portion 8, and a detection chamber 15 is formed in the middle of the first cylinder 10. The lower end of the detection chamber 15 remains through, and the first detection member 4 is arranged on the lower end surface of the core support plate 1 through the first mounting disk 9.

[0048] A vertical annular wall 16 and an inclined annular wall 17 are formed in the detection chamber 15. The vertical annular wall 16 is arranged at the lower end of the inclined annular wall 17. The inclined annular wall 17 is in an inverted cone-shaped structure, which is larger at the top and smaller at the bottom. The inner wall of the detection chamber 15 is used to cooperate with the second detection member 5. When the first elastic arm 18 of the second detection member 5 is deformed, it can move closer to the inner wall of the detection chamber 15, so that the first contact surface 19 and the second contact surface 20 are in contact. When the radial angle or tilt of the core support plate 1 changes, it can be monitored by the first detection body 21 and the second detection body 22, the first elastic sheet 23 and the second elastic sheet 24, so that the data can be fed back to the control center, and the staff can obtain the status of the core support plate 1 in time.

[0049] A plurality of first detection bodies 21 are disposed on the inner wall of the inclined annular wall 17 . A first contact surface 19 is disposed on the first detection body 21 . The first contact surface 19 is disposed in an inclined manner.

[0050] The second detection member 5 is composed of an insert 25, a second annular body 26 and a second bottom plate 27. A second gap 28 is formed between the insert 25 and the second annular body 26, and the first annular body 11 is arranged in the second gap 28. When the first annular body 11 is inserted into the second gap 28, the second annular body 26 can be kept slightly deformed, so that the first detection member 4 and the second detection member 5 can be quickly installed.

[0051] The second annular body 26 is provided with a plurality of strip grooves 29, which divide the second annular body 26 into a plurality of second elastic arms 30. The upper end of the second elastic arm 30 is provided with a fixed end 31, and the fixed end 31 is provided with a blocking surface 32 and a guiding inclined surface 33. The first annular body 11 is provided with a bearing surface 34 that cooperates with the blocking surface 32. The position of the first annular body 11 can be fixed by the fixed end 31.

[0052] A plurality of spacing grooves 35 and annular grooves 36 are provided in the middle of the insert 25, and the spacing grooves 35 are connected with the annular grooves 36. The insert 25 is divided into a plurality of first elastic arms 18 by the spacing grooves 35 and the annular grooves 36, and the first elastic arms 18 can be deformed more by the spacing grooves 35 and the annular grooves 36. An annular groove 37 is provided on the first elastic arm 18, and the annular groove 37 can also keep the first elastic arm 18 from deforming more, and keep the first contact surface 19 and the second contact surface 20 on the first detection body 21 and the second detection body 22 in contact.

[0053] The upper end of the insert 25 is provided with a conical head 38, which is small at the top and large at the bottom. The conical head 38 is provided with a second detection body 22 that matches the first detection body 21. The second detection body 22 is provided with a second contact surface 20, which is inclined, and its inclination direction and angle match the second contact surface 20. The conical head 38 is provided with a stepped opening 70 for limiting the transition deformation of the first elastic arm 18. When the first elastic arm 18 is pushed to unfold, the stepped opening 70 is kept in contact with the inner wall of the first mounting portion 8.

[0054] The inserting body 25 is inserted into the detection chamber 15 from the lower end of the first detection body 21 , a third gap 39 is formed between the inserting body 25 and the inner wall of the detection chamber 15 , and a driving chamber 40 is formed in the middle of the inserting body 25 .

[0055] The first detection body 21 is provided with a first elastic sheet 23, and the second detection body 22 is provided with a second elastic sheet 24. The first elastic sheet 23 is arranged at the lower end of the first detection body 21, and the second elastic sheet 24 is arranged at the upper end of the second detection body 22. One end of the first elastic sheet 23 remains connected to the first detection body 21, and the other end is a free end, and one end of the second elastic sheet 24 remains connected to the second detection body 22, and the other end is a free end.

[0056] One end of the first elastic sheet 23 and the second elastic sheet 24 is kept stationary, while the other end can be deformed by force, thereby realizing the monitoring of the angle change of the core support plate 1.

[0057] The driving assembly 6 is provided with a fixed disk 41, a driving member 42, an adjusting member 43 and an electromagnetic member 44. A through hole 45 is provided in the middle of the fixed disk 41. The driving member 42 is composed of a rod body 46 and a driving body 47. The adjusting member 43 is composed of a threaded rod 48 and a pushing disk 49. A threaded portion 50 is provided on the threaded rod 48. A threaded hole 51 matching the threaded rod 48 is provided in the middle of the rod body 46. The driving member 42 is arranged in the driving chamber 40.

[0058] The electromagnetic member 44 is arranged at the lower end of the push disk 49. When the driving member 42 is at the second protrusion 52, the electromagnetic member 44 can be energized to attract the push disk 49, thereby keeping the driving member 42 moving downward and compressing the elastic member 54, so that the driving body 47 enters the concave surface 53. When the angle detector 2 needs to be started again, the power supply of the electromagnetic member 44 is disconnected, and the adjusting member 43 and the driving member 42 are pushed under the elastic force of the elastic member 54, so that the driving body 47 pushes the first elastic arm 18, so that the first contact surface 19 and the second contact surface 20 are in contact.

[0059] The drive chamber 40 is provided with a conical surface 55, a first protrusion 56, a concave surface 53 and a second protrusion 52 from bottom to top. The concave surface 53 is inclined and matches with the annular inclined surface 57 on the drive body 47. The first protrusion 56 is provided with a first guide inclined surface 58, a first protrusion surface 59 and a second guide inclined surface 60. The second protrusion 52 is provided with a third guide inclined surface 61, a second protrusion surface 62 and a fourth guide inclined surface 63. The first blocking inclined surface 64 contacts with the third guide inclined surface 61, and the second blocking inclined surface 65 matches with the second guide inclined surface 60.

[0060] An elastic member 54 is disposed on the rod body 46, and the elastic member 54 is located between the driving body 47 and the pushing plate 49, and the threaded rod 48 is disposed in the through hole 45. The elastic member 54 is a spring.

[0061] The driving body 47 is arranged in a frustum shape, which is small at the top and large at the bottom. An annular slope 57 is arranged on the driving body 47. A first blocking slope 64 is arranged at the upper end of the annular slope 57, and a second blocking slope 65 is arranged at the lower end.

[0062] When the adjusting member 43 is rotated, the distance of the threaded portion 50 in the threaded hole 51 can be changed, thereby controlling the elongation of the elastic member 54 and the elastic force of the elastic member 54. When the threaded portion 50 is less deeply inserted into the threaded hole 51, the elastic member 54 is more extended at this time, and the distance between the driving body 47 and the fixed plate 41 is kept larger, while when the threaded portion 50 is more deeply inserted into the threaded hole 51, the elastic member 54 is less extended at this time, and the distance between the driving body 47 and the fixed plate 41 is kept smaller.

[0063] like Figure 5As shown, the driving body 47 is just at the concave surface 53 at this time, so as to limit the position of the driving body 47. When the adjusting member 43 is rotated so that the threaded portion 50 is less placed in the threaded hole 51, the elastic member 54 can push the driving body 47 at this time, so that the driving body 47 passes over the second protruding portion 52, and the annular inclined surface 57 contacts the second protruding portion 52. Since the inner diameter of the second protruding portion 52 is smaller than that of the concave surface 53, when the concave surface 53 is at the second protruding portion 52, it can push the first elastic arm 18 to deform and keep the first contact surface 19 and the second contact surface 20 in contact.

[0064] Before the angle detector 2 is used, the driving body 47 is located at the concave surface 53 . When installing, it can be adjusted to the second protruding portion 52 , so that the first contact surface 19 and the second contact surface 20 are in contact.

[0065] The support member 7 is arranged at the lower end of the driving assembly 6. The support member 7 is composed of a disk 66, a first column 67 and a second column 68 from top to bottom. An active chamber 69 is formed between the disk 66 and the first column 67. The diameter of the second column 68 is smaller than that of the first column 67. The electromagnetic member 44 and the push disk 49 are arranged at the bottom of the active chamber 69. The second column 68 can be arranged on the bottom inner wall of the core shell to maintain the installation of the angle detector 2.

[0066] The angle detector 2 can realize the rotation angle monitoring of the core support plate 1 through the cooperation of the first detection body 21 and the second detection body 22. When the radial angle of the core support plate 1 changes, the first detection member 4 and the second detection member 5 will not contact or the contact pressure will be too large. When the inclination angle of the core support plate 1 changes, the first elastic sheet 23 and the second elastic sheet 24 will undergo elastic deformation, thereby realizing the angle monitoring of the core support plate 1.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A nuclear power plant core support plate angle detector, characterized in that: include: A core support plate, wherein a positioning hole is provided in the middle of the core support plate. An angle detector is arranged at the lower end of the core support plate, and the angle detector is arranged in a positioning hole in the middle of the core support plate. The angle detector is used to detect the rotation angle and tilt angle of the core support plate. The angle detector includes: The first detection member is composed of a first mounting portion, a first mounting plate, a first cylinder, a first annular body and a first bottom plate. The first bottom plate connects the first cylinder and the first annular body. A first gap is formed between the first annular body and the first cylinder. A first mounting hole is formed in the middle of the first mounting portion. A detection chamber is formed in the middle of the first cylinder. The lower end of the detection chamber is kept through. The first detection member is arranged on the lower end surface of the core support plate through the first mounting plate. The second detection member is composed of an insert, a second annular body and a second bottom plate, a second gap is formed between the insert and the second annular body, the first annular body is arranged in the second gap, a plurality of spacing grooves and annular grooves are arranged in the middle of the insert, the spacing grooves are connected with the annular grooves, the insert is divided into a plurality of first elastic arms by the spacing grooves and the annular grooves, the insert is inserted into the detection chamber from the lower end of the first detection body, a third gap is formed between the insert and the inner wall of the detection chamber, and a driving chamber is formed in the middle of the insert, A driving assembly, wherein a fixed disk, a driving member, an adjusting member and an electromagnetic member are provided in the driving assembly, a through hole is provided in the middle of the fixed disk, the driving member is composed of a rod body and a driving body, the adjusting member is composed of a threaded rod and a pushing disk, the threaded rod is provided with a threaded portion, a threaded hole matching the threaded rod is provided in the middle of the rod body, the driving member is arranged in a driving chamber, an elastic member is provided on the rod body, the elastic member is located between the driving body and the pushing disk, the threaded rod is arranged in the through hole, And a support member arranged at the lower end of the driving component, the support member is composed of a disk body, a first column body and a second column body from top to bottom, an active chamber is formed between the disk body and the first column body, the diameter of the second column body is smaller than the diameter of the first column, and the electromagnetic member and the pushing disk are arranged at the bottom of the active chamber.

2. The nuclear power plant core support plate angle detector according to claim 1, characterized in that: A vertical annular wall and an inclined annular wall are formed in the detection chamber. The vertical annular wall is arranged at the lower end of the inclined annular wall. The inclined annular wall is in an inverted frustum-shaped structure, which is larger at the top and smaller at the bottom.

3. The nuclear power plant core support plate angle detector according to claim 2, characterized in that: A plurality of first detection bodies are arranged on the inner wall of the inclined annular wall. A first contact surface is arranged on the first detection body. The first contact surface is arranged in an inclined manner.

4. The nuclear power plant core support plate angle detector according to claim 3, characterized in that: The upper end of the insert is provided with a conical head, which is small at the top and large at the bottom. A second detection body that matches the first detection body is provided on the conical head. The second detection body is provided with a second contact surface, which is inclined, and its inclination direction and angle match the second contact surface.

5. The nuclear power plant core support plate angle detector according to claim 4, characterized in that: A first elastic sheet is provided on the first detection body, and a second elastic sheet is provided on the second detection body. The first elastic sheet is arranged at the lower end of the first detection body, and the second elastic sheet is arranged at the upper end of the second detection body. One end of the first elastic sheet remains connected to the first detection body, and the other end is a free end. One end of the second elastic sheet remains connected to the second detection body, and the other end is a free end.

6. The nuclear power plant core support plate angle detector according to claim 1, characterized in that: An annular groove is provided on the first elastic arm.

7. The nuclear power plant core support plate angle detector according to claim 1, characterized in that: The second annular body is provided with a plurality of strip grooves, the strip grooves divide the second annular body into a plurality of second elastic arms, the upper end of the second elastic arm is provided with a fixed end, the fixed end is provided with a blocking surface and a guiding inclined surface, and the first annular body is provided with a bearing surface matching the blocking surface.

8. The nuclear power plant core support plate angle detector according to claim 1, characterized in that: The driving body is arranged in a frustum shape, which is small at the top and large at the bottom. An annular slope is arranged on the driving body. The upper end of the annular slope is provided with a first blocking slope, and the lower end is provided with a second blocking slope.

9. The nuclear power plant core support plate angle detector according to claim 8, characterized in that: The driving chamber is provided with a conical surface, a first convex portion, a concave surface and a second convex portion in sequence from bottom to top. The concave surface is inclined and matched with the annular inclined surface on the driving body.

10. The nuclear power plant core support plate angle detector according to claim 9, characterized in that: The first protrusion is provided with a first guiding slope, a first protrusion surface and a second guiding slope, the second protrusion is provided with a third guiding slope, a second protrusion surface and a fourth guiding slope, the first blocking slope contacts the third guiding slope, and the second blocking slope cooperates with the second guiding slope.

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