A control rod position detection sensor for a nuclear power plant

Abstract

The present invention discloses a nuclear power plant control rod position detection sensor, comprising a travel sleeve, a control rod and a detection assembly. A control assembly is provided in a first installation area, and a limit assembly is provided in a third installation area. The detection assembly comprises a cover plate, a base and a sensing assembly. The sensing assembly consists of an unlocking member and a locking member. The nuclear power plant control rod position detection sensor can limit the position of an extension rod and a control rod through a limit assembly, so that the position can be positioned when the control rod is working or not working, thereby avoiding the position of the control rod from being offset and affecting the energy generated. At the same time, the position of the control rod is monitored by sensing the position of the permanent magnet through the detection assembly. The detection assembly can not only be installed quickly, but also the number of detection assemblies can be changed according to actual needs, which is conducive to real-time monitoring of the movement of the control rod.

Description

Technical Field

[0001] The invention relates to sensor technology, and in particular to a sensor for detecting the position of a control rod of a nuclear power plant. Background Art

[0002] At present, during the daily operation of nuclear power plants, the control rod groups in some reactors are in the fully extended position, and the control rods in these reactors will not perform any actions temporarily. Since these control rods in the reactors are in the fully extended position, and these control rods may be accidentally stuck in the fully extended position, these control rods may not be able to operate normally after normal operation. In addition, the control rods may be accidentally stuck in the fully extended position and cannot operate normally, which will cause the power and temperature distribution of the reactor where the control rod group is located to be uneven, and even cause nuclear power plant safety accidents. Therefore, nuclear power plants need to be able to easily maintain the control rod position and monitor the control rod position in real time. Summary of the invention

[0003] In order to solve the defects of the above-mentioned prior art, the present invention proposes a control rod position detection sensor for a nuclear power plant.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A control rod position detection sensor for a nuclear power plant, characterized by comprising:

[0006] The travel sleeve is composed of a first rod body, a second rod body and a mounting plate for connecting the first rod body and the second rod body. The first rod body is hollowed out to form a first mounting area, the second rod body is hollowed out to form a second mounting area, and the first mounting area and the second mounting area are connected.

[0007] A control rod is arranged in the second installation area, an extension rod is arranged at the upper end of the control rod, the extension rod is arranged in the first installation area, the interior of the extension rod is hollowed out to form a third installation area, a control component is arranged in the first installation area, a limit component is arranged in the third installation area, the control component and the limit component are connected by a traction member, an extension hole through which the limit component passes is arranged on the extension rod, a plurality of locking grooves cooperating with the limit component are arranged on the inner wall of the second installation area, the movement of the limit component is controlled by the control component to change the positions of the extension rod and the control rod in the first installation area and the second installation area, a chamber is arranged inside the extension rod, and a permanent magnet is arranged in the chamber,

[0008] A plurality of detection components are arranged outside the second rod body, and the detection components include:

[0009] A cover plate, wherein a first through hole is formed in the middle of the cover plate,

[0010] A base is located at the lower end of the cover plate, wherein a second through hole matching the first through hole is provided in the middle of the base, and a symmetrically arranged mounting groove is further provided on the base, wherein the mounting groove is communicated with the second through hole, and the mounting groove is composed of a first slide groove, a limiting groove, and a second slide groove, wherein the width of the limiting groove is greater than the width of the first slide groove and the second slide groove,

[0011] And a sensing component arranged in the mounting groove, the sensing component consists of an unlocking member and a locking member, the unlocking member is arranged in the first sliding groove, the locking member is arranged in the second sliding groove, the unlocking member and the locking member are connected by a crossed first hinged rod and a second hinged rod, the middle of the first hinged rod and the second hinged rod are connected by a hinge axis, one end of the first hinged rod is hinged to the unlocking member, and the other end is hinged to the locking member, one end of the second hinged rod is hinged to the unlocking member, and the other end is hinged to the locking member, the unlocking member is provided with a symmetrically arranged pushing block, the pushing block is arranged in the limiting groove, the pushing block is provided with a positioning rod, and the positioning rod is sleeved with a first spring.

[0012] In the present invention, the unlocking member is provided with a symmetrically arranged first strip hole, the locking member is provided with a symmetrically arranged second strip hole, the first hinged rod is respectively provided with a first movable rod at both ends, the second hinged rod is respectively provided with a second movable rod at both ends, the first movable rod on the first hinged rod is respectively arranged in the first strip hole on the unlocking member and the second strip hole on the locking member, and the second movable rod on the second hinged rod is respectively arranged in the first strip hole on the unlocking member and the second strip hole on the locking member.

[0013] In the present invention, the unlocking member is provided with a first movable groove and a second movable groove, the first movable groove is located at the upper end of the second movable groove, the first hinged rod is arranged in the first movable groove, the second hinged rod is arranged in the second movable groove, the first movable groove is connected with the first strip hole and the second strip hole, and the second movable groove is connected with the first strip hole and the second strip hole.

[0014] In the present invention, the control component is provided with an electromagnetic component, a permanent magnet component, and a symmetrically arranged first mounting body and a second mounting body. The electromagnetic component is located at the upper end of the permanent magnet component, a traction rod is provided at the lower end of the permanent magnet component, and a hook portion is provided on the traction rod. A guide groove is provided in the middle of the second mounting body. One end of the traction component is connected to the first mounting body, the middle is arranged in the guide groove, and the other end is connected to the limit assembly.

[0015] In the present invention, an active area is formed between the first installation body and the second installation body, the hook portion is placed in the active area, and the traction member is placed in the middle of the hook portion.

[0016] In the present invention, the limiting assembly is provided with a pushing body, a limiting body and a symmetrically arranged fixed body, a fixed area is formed inside the fixed body, the pushing body and the limiting body are arranged in the fixed area, a fixing hole is provided on the fixed body, a fixing rod is provided in the fixing hole, and an extension port is also provided on the fixed body, the extension port is connected to the fixed area, and the extension port is arranged corresponding to the position of the extension hole.

[0017] In the present invention, a guide portion is provided on the pushing body, a first vertical surface and a first inclined surface are provided on the guide portion, and two sides of the guide portion respectively form a first blocking surface and a second blocking surface.

[0018] In the present invention, the limiting body is provided with a second inclined surface cooperating with the first inclined surface and an extension head extending from the extension port into the extension hole. The limiting body cooperates with the locking groove for limiting. The limiting body is also provided with a retaining hole. A second spring is provided in the retaining hole. One end of the second spring is arranged in the retaining hole, and the other end contacts the inner wall of the fixed area. A compression area is formed between the limiting body and the inner wall of the fixed area. The limiting body is also provided with a third blocking surface cooperating with the second blocking surface. A first disappearing area is formed between the second blocking surface and the third blocking surface.

[0019] In the present invention, a limit block is further provided in the fixed area, and a second vertical surface and a fourth blocking surface are provided on the limit block, and a second disappearing area is formed between the fourth blocking surface and the first blocking surface.

[0020] In the present invention, a sliding groove is provided in the middle of the limiting body, a sliding hole connected to the fixed area is provided on the fixed body, a connecting rod is provided on the pushing body, the connecting rod is arranged in the sliding groove and the sliding hole, a connecting ball is provided on the connecting rod, and the connecting rod is connected to the traction member through the connecting ball.

[0021] The nuclear power plant control rod position detection sensor implementing the present invention has the following beneficial effects: the nuclear power plant control rod position detection sensor can limit the position of the extension rod and the control rod through the limit assembly, so that the position can be positioned when it is working or not working, avoiding the position of the control rod from being offset and affecting the energy generated. At the same time, the position of the control rod is monitored by sensing the position of the permanent magnet through the detection assembly. The detection assembly can not only be installed quickly, but also the number of detection assemblies can be changed according to actual needs, which is conducive to real-time monitoring of the movement of the control rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a nuclear power plant control rod position detection sensor of the present invention;

[0023] Figure 2 for Figure 1Schematic diagram of the detection component structure in ;

[0024] Figure 3 for Figure 2 A top view of

[0025] Figure 4 for Figure 2 Exploded diagram of

[0026] Figure 5 for Figure 4 A perspective view of the sensing component structure in FIG.

[0027] Figure 6 for Figure 1 Schematic diagram of the travel sleeve and control rod structure;

[0028] Figure 7 for Figure 6 Exploded diagram of

[0029] Figure 8 for Figure 7 The cross-sectional view of the travel casing structure in FIG.

[0030] Fig. 9 for Figure 7 The cross-sectional view of the extension rod and control rod structure;

[0031] Fig.10 for Figure 7 Schematic diagram of the control component structure in;

[0032] Fig.11 for Figure 7 Exploded diagram of the limit component structure;

[0033] Fig.12 for Fig.11 A perspective view of the limiting body structure in FIG.

[0034] Fig.13 for Fig.11 Schematic diagram of the propulsion body structure;

[0035] Fig.14 for Fig.11 Schematic diagram of the fixed body structure;

[0036] Fig.15 for Fig.11 Schematic diagram of the installation status of the fixed body, limiting body and pushing body structure.

[0037] In the figure: travel sleeve 1, control rod 2, detection component 3, first rod body 4, second rod body 5, mounting plate 6, first mounting area 7, second mounting area 8, extension rod 9, third mounting area 10, limit assembly 11, control assembly 12, traction member 13, limit body 14, fixed area 15, extension hole 16, extension head 17, extension port 18, locking groove 19, chamber 20, permanent magnet 21, electromagnetic member 22, permanent magnet member 23, first mounting body 24, second mounting body 25, traction rod 26, hook portion 27, guide groove 28, movable area 29, connecting rod 30, pushing body 31, cover plate 32, base 33, induction assembly 34, first through hole 35, second through hole 36, locking member 37, mounting groove 38, first slide groove 39, limit groove 40, The second sliding groove 41, the unlocking piece 42, the first hinged rod 43, the second hinged rod 44, the hinge shaft 45, the pushing block 46, the positioning rod 47, the first spring 48, the first strip hole 49, the second strip hole 50, the first movable rod 51, the second movable rod 52, the first movable groove 53, the second movable groove 54, the fixing body 55, the fixing hole 56, the fixing rod 57, the guiding portion 58, the first vertical surface 59, the arc surface 60, the first blocking surface 61, the second blocking surface 62, the first inclined surface 63, the second inclined surface 64, the retaining hole 65, the second spring 66, the compression area 67, the third blocking surface 68, the first disappearing area 69, the limiting block 70, the second vertical surface 71, the fourth blocking surface 72, the second disappearing area 73, the sliding groove 74, the sliding hole 75, and the connecting ball 76. DETAILED DESCRIPTION

[0038] 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.

[0039] like Figures 1 to 15 As shown, the nuclear power plant control rod position detection sensor of the present invention comprises a travel sleeve 1, a control rod 2 and a plurality of detection components 3. The control rod 2 slides inside the travel sleeve 1, thereby changing the extension amount of the control rod 2. The detection component 3 is used to monitor the extension distance of the control rod 2.

[0040] The travel sleeve 1 is composed of a first rod body 4, a second rod body 5, and a mounting plate 6 for connecting the first rod body 4 and the second rod body 5. The first rod body 4 is hollowed out to form a first mounting area 7, and the second rod body 5 is hollowed out to form a second mounting area 8. The first mounting area 7 and the second mounting area 8 are connected, so that the extension rod 9 and the control rod 2 can move up and down in the first mounting area 7 and the second mounting area 8.

[0041] The control rod 2 is arranged in the second installation area 8, and an extension rod 9 is arranged at the upper end of the control rod 2. The extension rod 9 is used to drive the control rod 2, so that the upper end of the control rod 2 does not need to be extended, and the extension and retraction of the control rod 2 can be achieved by controlling the extension and retraction of the extension rod 9. The extension rod 9 is arranged in the first installation area 7, and the interior of the extension rod 9 is hollowed out to form a third installation area 10. The cross section of the third installation area 10 is square, which is convenient for the installation of the limit assembly 11.

[0042] A control component 12 is provided in the first installation area 7, and a limiting component 11 is provided in the third installation area 10. The control component 12 and the limiting component 11 are connected via a traction member 13. The control component 12 is used to control a limiting body 14 in the limiting component 11 to extend out of a fixing area 15 or retract into the fixing area 15, thereby limiting the position of the control rod 2 so that the control rod 2 can remain stationary during operation.

[0043] The extension rod 9 is provided with an extension hole 16 through which the limit assembly 11 passes, and the extension head 17 extends from the extension opening 18 into the extension hole 16, and then extends into the locking groove 19 through the extension hole 16. Since the position of the travel sleeve 1 is fixed, the extension head 17 on the limit assembly 11 will be locked with the locking groove 19, keeping the position of the control rod 2 fixed.

[0044] The inner wall of the second installation area 8 is provided with a plurality of locking grooves 19 cooperating with the limit assembly 11. The movement of the limit assembly 11 is controlled by the control assembly 12 to change the positions of the extension rod 9 and the control rod 2 in the first installation area 7 and the second installation area 8. A chamber 20 is provided inside the extension rod 9, and a permanent magnet 21 is provided in the chamber 20.

[0045] The control component 12 is provided with an electromagnetic component 22, a permanent magnet component 23, and a symmetrically arranged first mounting body 24 and a second mounting body 25. The electromagnetic component 22 is located at the upper end of the permanent magnet component 23, and a traction rod 26 is provided at the lower end of the permanent magnet component 23. The traction rod 26 is provided with a hook portion 27. A guide groove 28 is provided in the middle of the second mounting body 25. One end of the traction component 13 is connected to the first mounting body 24, and the middle is arranged in the guide groove 28, and the other end is connected to the limit component 11.

[0046] An active area 29 is formed between the first mounting body 24 and the second mounting body 25 . The hook portion 27 is disposed in the active area 29 , and the traction member 13 is disposed in the middle of the hook portion 27 .

[0047] The electromagnetic member 22 is used to attract and push the permanent magnet member 23, thereby controlling the elongation of the traction member 13 at the active area 29. Regardless of whether the permanent magnet member 23 is pushed or attracted by the electromagnetic member 22, the traction member 13 in the guide groove 28 is pulled, so that the traction member 13 pulls the connecting rod 30, so that the connecting rod 30 pulls the pushing body 31, so that the pushing body 31 moves upward, pushes the limiting body 14, and the protruding head 17 on the limiting body 14 retracts from the locking groove 19, so that the driving member can push or pull the extension rod 9, thereby realizing the movement of the control rod 2 and controlling the operation of the nuclear power plant.

[0048] The detection assembly 3 is arranged outside the second rod body 5, and the detection assembly 3 is provided at multiple locations. The detection assembly 3 includes a cover plate 32, a base 33 and a sensing assembly 34. A first through hole 35 is formed in the middle of the cover plate 32, and the base 33 is located at the lower end of the cover plate 32. A second through hole 36 matching the first through hole 35 is provided in the middle of the base 33. The inner diameters of the first through hole 35 and the second through hole 36 are larger than the outer diameter of the second rod body 5, so that the locking member 37 can be provided on the second rod body 5. A symmetrically arranged mounting groove 38 is also provided on the base 33, and the mounting groove 38 is connected to the second through hole 36. The mounting groove 38 is composed of a first slide groove 39, a limiting groove 40 and a second slide groove 41, and the width of the limiting groove 40 is larger than the width of the first slide groove 39 and the second slide groove 41.

[0049] The induction assembly 34 is arranged in the installation groove 38, and the induction assembly 34 is composed of an unlocking member 42 and a locking member 37. The unlocking member 42 is arranged in the first slide groove 39, and the locking member 37 is arranged in the second slide groove 41. The unlocking member 42 and the locking member 37 are connected by a crossed first hinge rod 43 and a second hinge rod 44.

[0050] The first hinged rod 43 and the second hinged rod 44 are connected in the middle by a hinge shaft 45. One end of the first hinged rod 43 is hinged on the unlocking member 42, and the other end is hinged on the locking member 37. One end of the second hinged rod 44 is hinged on the unlocking member 42, and the other end is hinged on the locking member 37. The unlocking member 42 is provided with a symmetrically arranged pushing block 46, which is arranged in the limiting groove 40. The pushing block 46 is provided with a positioning rod 47, and the positioning rod 47 is sleeved with a first spring 48.

[0051] The unlocking member 42 is provided with a first strip hole 49 symmetrically arranged, the locking member 37 is provided with a second strip hole 50 symmetrically arranged, the first hinge rod 43 is provided with a first movable rod 51 at both ends, and the second hinge rod 44 is provided with a second movable rod 52 at both ends. The first movable rod 51 on the first hinge rod 43 is respectively arranged in the first strip hole 49 on the unlocking member 42 and the second strip hole 50 on the locking member 37, and the second movable rod 52 on the second hinge rod 44 is respectively arranged in the first strip hole 49 on the unlocking member 42 and the second strip hole 50 on the locking member 37.

[0052] The unlocking member 42 is provided with a first movable groove 53 and a second movable groove 54. The first movable groove 53 is located at the upper end of the second movable groove 54. The first hinge rod 43 is arranged in the first movable groove 53. The second hinge rod 44 is arranged in the second movable groove 54. The first movable groove 53 is connected with the first strip hole 49 and the second strip hole 50. The second movable groove 54 is connected with the first strip hole 49 and the second strip hole 50.

[0053] The limiting assembly 11 is provided with a pusher 31, a limiting body 14 and a symmetrically arranged fixed body 55, wherein the limiting body 14 is an electromagnet, which cooperates with the permanent magnet 21, and monitors the position of the permanent magnet 21 through the electromagnet, so as to realize the monitoring of the position of the extension rod 9. The fixed body 55 forms a fixed area 15 inside, and the pusher 31 and the limiting body 14 are arranged in the fixed area 15. The fixed body 55 is provided with a fixing hole 56, and a fixing rod 57 is arranged in the fixing hole 56. The fixed bodies 55 are connected and installed with each other through the fixing rod 57. The fixed body 55 is also provided with a protruding opening 18, which is connected with the fixed area 15, and the protruding opening 18 is arranged corresponding to the position of the protruding opening 18 and the protruding hole 16.

[0054] The pusher 31 is provided with a guide portion 58 , and the guide portion 58 is provided with a first vertical surface 59 and a first inclined surface 63 . Two sides of the guide portion 58 form a first blocking surface 61 and a second blocking surface 62 , respectively.

[0055] The limiting body 14 is provided with a second inclined surface 64 cooperating with the first inclined surface 63 and a protruding head 17 extending from the protruding opening 18 deep into the protruding hole 16, and the limiting body cooperates with the locking groove 19 to limit. The limiting body 14 is also provided with a retaining hole 65, in which a second spring 66 is provided, one end of the second spring 66 is arranged in the retaining hole 65, and the other end contacts the inner wall of the fixing area 15.

[0056] A compression area 67 is formed between the limiting body 14 and the inner wall of the fixing area 15. The limiting body 14 is also provided with a third blocking surface 68 that cooperates with the second blocking surface 62. A first disappearing area 69 is formed between the second blocking surface 62 and the third blocking surface 68. A limiting block 70 is also provided in the fixing area 15. The limiting block 70 is provided with a second vertical surface 71 and a fourth blocking surface 72. A second disappearing area 73 is formed between the fourth blocking surface 72 and the first blocking surface 61.

[0057] A sliding groove 74 is provided in the middle of the limiting body 14, a sliding hole 75 connected to the fixed area 15 is provided on the fixed body 55, a connecting rod 30 is provided on the pushing body 31, the connecting rod 30 is arranged in the sliding groove 74 and the sliding hole 75, and a connecting ball 76 is provided on the connecting rod 30, and the connecting rod 30 is connected to the traction member 13 through the connecting ball 76.

[0058] The limiting body 14 is provided with an arc surface 60 , and the arc surface 60 is used to cooperate with the second rod body 5 .

[0059] When the connecting rod 30 is pulled upward, the connecting rod 30 will drive the pushing body 31 upward, so that the first inclined surface 63 pushes the second inclined surface 64, so that the limiting body 14 compresses the second spring 66 and reduces the compression area 67. At the same time, the first disappearing area 69 and the second disappearing area 73 are reduced, and the first blocking surface 61 is kept in contact with the fourth blocking surface 72, the second blocking surface 62 is kept in contact with the third blocking surface 68, and the first vertical surface 59 is kept in contact with the second vertical surface 71, so as to limit the upward movement of the pushing body 31.

[0060] The driving method of the extension rod in the present application can adopt the existing technology, and in the existing technology, there are mainly three types of control rod drive mechanisms used in pressurized water reactors currently in operation around the world: magnetic lifting, ball nut screw and gear rack. In the past few years, in some pressurized water reactors, both magnetic lifting and gear rack mechanisms were often used at the same time, with magnetic lifting as the driving mechanism of the full-length control rod assembly and gear rack pair as the driving mechanism of the short rod assembly. In recent years, commercial pressurized water reactor nuclear power plants in Germany, the United States, France and other countries have cancelled the short rod assembly and its driving mechanism, and only selected the magnetic lifting type as the driving mechanism of the full-length control rod assembly.

[0061] Compared with other types, the magnetic lift control rod drive mechanism has the advantages of simple structure, convenient manufacturing, large lifting force, small wear, long life and good economy. At the same time, even if key components fail, the reactor can be shut down quickly. Therefore, the magnetic lift control rod drive mechanism has been widely used. The magnetic lift control rod drive mechanism is mainly composed of a drive rod assembly, a hook assembly, a pressure shell, a yoke coil assembly, and a rod position detector assembly.

[0062] 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 control rod position detection sensor for a nuclear power plant, characterized in that: include: The travel sleeve is composed of a first rod body, a second rod body and a mounting plate for connecting the first rod body and the second rod body. The first rod body is hollowed out to form a first mounting area, the second rod body is hollowed out to form a second mounting area, and the first mounting area and the second mounting area are connected. A control rod is arranged in the second installation area, an extension rod is arranged at the upper end of the control rod, the extension rod is arranged in the first installation area, the interior of the extension rod is hollowed out to form a third installation area, a control component is arranged in the first installation area, a limit component is arranged in the third installation area, the control component and the limit component are connected by a traction member, an extension hole through which the limit component passes is arranged on the extension rod, a plurality of locking grooves cooperating with the limit component are arranged on the inner wall of the second installation area, the movement of the limit component is controlled by the control component to change the positions of the extension rod and the control rod in the first installation area and the second installation area, a chamber is arranged inside the extension rod, and a permanent magnet is arranged in the chamber, A plurality of detection components are arranged outside the second rod body, and the detection components include: A cover plate, wherein a first through hole is formed in the middle of the cover plate, A base is located at the lower end of the cover plate, wherein a second through hole matching the first through hole is provided in the middle of the base, and a symmetrically arranged mounting groove is further provided on the base, wherein the mounting groove is communicated with the second through hole, and the mounting groove is composed of a first slide groove, a limiting groove, and a second slide groove, wherein the width of the limiting groove is greater than the width of the first slide groove and the second slide groove, And a sensing component arranged in the mounting groove, the sensing component consists of an unlocking member and a locking member, the unlocking member is arranged in the first sliding groove, the locking member is arranged in the second sliding groove, the unlocking member and the locking member are connected by a crossed first hinged rod and a second hinged rod, the middle of the first hinged rod and the second hinged rod are connected by a hinge axis, one end of the first hinged rod is hinged to the unlocking member, and the other end is hinged to the locking member, one end of the second hinged rod is hinged to the unlocking member, and the other end is hinged to the locking member, the unlocking member is provided with a symmetrically arranged pushing block, the pushing block is arranged in the limiting groove, the pushing block is provided with a positioning rod, and the positioning rod is sleeved with a first spring.

2. The nuclear power plant control rod position detection sensor according to claim 1, characterized in that: The unlocking member is provided with a first strip hole symmetrically arranged, and the locking member is provided with a second strip hole symmetrically arranged. The first hinged rod is provided with a first movable rod at both ends, and the second hinged rod is provided with a second movable rod at both ends. The first movable rod on the first hinged rod is respectively arranged in the first strip hole on the unlocking member and the second strip hole on the locking member, and the second movable rod on the second hinged rod is respectively arranged in the first strip hole on the unlocking member and the second strip hole on the locking member.

3. The nuclear power plant control rod position detection sensor according to claim 2, characterized in that: The unlocking member is provided with a first movable groove and a second movable groove, the first movable groove is located at the upper end of the second movable groove, the first hinged rod is arranged in the first movable groove, the second hinged rod is arranged in the second movable groove, the first movable groove is connected with the first strip hole and the second strip hole, and the second movable groove is connected with the first strip hole and the second strip hole.

4. The nuclear power plant control rod position detection sensor according to claim 1, characterized in that: The control component is provided with an electromagnetic component, a permanent magnet component, and a symmetrically arranged first mounting body and a second mounting body. The electromagnetic component is located at the upper end of the permanent magnet component, a traction rod is provided at the lower end of the permanent magnet component, and a hook portion is provided on the traction rod. A guide groove is provided in the middle of the second mounting body. One end of the traction component is connected to the first mounting body, the middle is arranged in the guide groove, and the other end is connected to the limit assembly.

5. The nuclear power plant control rod position detection sensor according to claim 4, characterized in that: An active area is formed between the first installation body and the second installation body, the hook portion is placed in the active area, and the traction member is placed in the middle of the hook portion.

6. The nuclear power plant control rod position detection sensor according to claim 5, characterized in that: The limiting assembly is provided with a pushing body, a limiting body and a symmetrically arranged fixed body, a fixed area is formed inside the fixed body, the pushing body and the limiting body are arranged in the fixed area, a fixing hole is provided on the fixed body, a fixing rod is provided in the fixing hole, and a protruding port is also provided on the fixed body, the protruding port is communicated with the fixed area, and the protruding port is arranged corresponding to the position of the protruding hole.

7. The nuclear power plant control rod position detection sensor according to claim 6, characterized in that: The pushing body is provided with a guide portion, the guide portion is provided with a first vertical surface and a first inclined surface, and two sides of the guide portion respectively form a first blocking surface and a second blocking surface.

8. The nuclear power plant control rod position detection sensor according to claim 7, characterized in that: The limiting body is provided with a second inclined surface cooperating with the first inclined surface and an extension head extending from the extension port into the extension hole. The limiting body cooperates with the locking groove for limiting. The limiting body is also provided with a retaining hole. A second spring is provided in the retaining hole. One end of the second spring is arranged in the retaining hole, and the other end contacts the inner wall of the fixed area. A compression area is formed between the limiting body and the inner wall of the fixed area. The limiting body is also provided with a third blocking surface cooperating with the second blocking surface. A first disappearing area is formed between the second blocking surface and the third blocking surface.

9. The nuclear power plant control rod position detection sensor according to claim 8, characterized in that: A limit block is also provided in the fixed area, and a second vertical surface and a fourth blocking surface are provided on the limit block, and a second disappearing area is formed between the fourth blocking surface and the first blocking surface.

10. The nuclear power plant control rod position detection sensor according to claim 9, characterized in that: A sliding groove is provided in the middle of the limiting body, a sliding hole connected to the fixed area is provided on the fixed body, a connecting rod is provided on the pushing body, the connecting rod is arranged in the sliding groove and the sliding hole, a connecting ball is provided on the connecting rod, and the connecting rod is connected to the traction member through the connecting ball.

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