A detection system for rod position system

Abstract

The present invention relates to the field of nuclear power instrumentation and control technology, and in particular to a detection system for a rod position system, including a rod position platform for fixing a rod position detector and a rod position platform for installing a simulated driving rod, the rod position platform comprising a support frame and a sliding plate slidably connected to the support frame, and the simulated driving rod is installed on the sliding plate. It also comprises a rack installed on the support frame, a driving device fixed to the sliding plate, and a gear connected to the driving end of the driving device, and the gear is meshed with the rack. This detection system can simulate the movement of a real driving rod relative to the rod position detector, and the rod position system detects the position information of the driving rod, and then performs the entire process of processing and transmission. During detection, the gear is rotated to drive the distance of the simulated driving rod to move, and the rod position information output by the rod position system is compared to obtain a more intuitive, real, and comprehensive rod position system detection result compared to the prior art, which is conducive to detecting problems that are difficult to detect with existing technologies.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power instrumentation and control technology, and in particular to a detection system for a rod position system. Background Art

[0002] The digital control rod control system and the digital control rod position indication system are both components of the important instrumentation and control systems of nuclear power plants.

[0003] The digital control rod control system, referred to as the rod control system, has the main function of controlling the insertion, movement and separation of the control rods in the core, thereby realizing the start-up, shutdown and power regulation of the reactor.

[0004] The digital control rod position indication system, referred to as the rod position system, has the main function of using a rod position detector to detect and obtain the position information of the drive rod connected to the control rod through non-contact electromagnetic induction technology. The position information of the drive rod can reflect the position information of the control rod in the reactor core, and then the data is processed through the rod position coding card and transmitted to the human-machine interface so that the staff can understand the rod position information.

[0005] Before the rod position system is installed in a nuclear power plant, performance testing is required to eliminate faults and thereby reduce the risk of radiation exposure to subsequent workers.

[0006] The Chinese invention patent with the publication number CN114068044A discloses a rod position system detection platform, including a verification chassis layer and a rod position logic simulation chassis layer; the verification chassis layer includes a verification interface; the verification interface is used to connect the component to be tested of the rod position system; the rod position logic simulation chassis layer is used to generate a rod position signal and send the rod position signal to the detector simulator; the verification chassis layer is used to receive the simulated rod position information generated by the detector simulator based on the rod position signal and send the simulated rod position information to the component to be tested; the rod position logic simulation chassis layer is also used to receive the functional processing result of the component to be tested and compare it with the preset reference result to output the detection result. However, the detection result output by the detection platform does not match the actual detection performance of the rod position system. When the rod position system is officially put into use to detect the rod position, some factors that are difficult to detect by the detection platform will cause the rod position information output by the rod position system to be inaccurate. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention proposes a detection system for a rod position system. The detection system can perform a more comprehensive detection of the rod position system and can detect problems that are difficult to detect with existing technologies, so that the detection results better match the actual detection performance of the rod position system.

[0008] The present invention is achieved through the following technical solutions:

[0009] A detection system for a rod position system comprises a rod position platform for fixing a rod position detector and a rod position platform for installing a simulated driving rod, wherein the rod position platform comprises a support frame and a sliding plate slidably connected to the support frame, and the simulated driving rod is installed on the sliding plate; it also comprises a rack installed on the support frame, a driving device fixed to the sliding plate, and a gear connected to the driving end of the driving device, and the gear is meshed with the rack.

[0010] The simulated driving rod of the present invention is used for the driving rod connected to the control rod in the simulated rod motion system. The length and other external dimensions of the simulated driving rod are the same as the dimensions of the driving rod corresponding to the rod position system to be measured, and the material of the simulated driving rod is also consistent with the real driving rod. The movement rule of the real driving rod in the working state is to move in steps with one unit distance as one step. The driving device can drive the gear to rotate at a certain speed and regularity to drive the sliding plate to move, and then drive the simulated driving rod fixed to the sliding plate to move at the speed and regularity of the real driving rod.

[0011] Therefore, the detection system can simulate the real driving rod moving at a certain speed and regularity relative to the rod position detector of the rod position system, and the rod position system detects the position information of the driving rod, and then performs the entire process of processing and transmission. During the detection, the gear is rotated to drive the simulated driving rod to move, and the distance is compared with the rod position information output by the rod position system to obtain a more intuitive, real and comprehensive rod position system detection result compared to the existing technology, which is conducive to the detection of problems that are difficult to detect with existing technologies, such as inaccurate and untimely feedback of rod position data due to factors such as the size of the driving rod and the specific movement law. Specifically, the driving device includes a servo motor and a reducer of the prior art, and the servo motor is connected to the PLC through a servo driver.

[0012] The present invention drives the gear to rotate through a driving device, thereby driving the simulated driving rod to move. The meshing transmission of the gear and the rack enables the moving speed and moving law of the simulated driving rod to correspond to the rotation speed and rotation law of the gear in a timely and accurate manner. Compared with the scheme of friction transmission through a device such as a conveyor belt that is easy to slip, this scheme can more accurately control the moving speed and moving law of the simulated driving rod, making the moving speed and moving law of the simulated driving rod closer to the moving speed and moving law of the real driving rod, thereby making the detection result more accurate.

[0013] Preferably, it further comprises a clamping and positioning device, which comprises two groups of roller groups, and the roller groups comprise rollers for abutting against the analog driving rod, and the two groups of roller groups respectively abut against both sides of the analog driving rod in the height direction.

[0014] The length of the real driving rod can reach five meters, so the length of the simulated driving rod can also reach five meters. During the specific test, the rod position detector and the simulated driving rod are installed horizontally to adapt to the floor height of the existing factory building and to facilitate the disassembly and assembly of the rod position detector and the simulated driving rod. The end of the simulated driving rod away from the rod position detector is installed on the sliding plate, and the other end enters and exits the rod position detector. However, since the simulated driving rod is too long, the end that enters and exits the rod position detector is prone to shaking, which makes it difficult to smoothly enter the rod position detector. The preferred support frame is equipped with a clamping alignment device for clamping the simulated driving rod, and the clamping alignment device is located at the support frame near the rod position detector. Thus, one end of the simulated driving rod that enters and exits the rod position detector can be clamped to prevent shaking, which is conducive to enabling the end to be aligned with the inner cavity opening of the rod position detector to smoothly enter the rod position detector. Furthermore, the clamping and positioning device clamps the simulated driving rod through a roller, and the simulated driving rod drives the roller to rotate when it moves. The setting of the roller can transform sliding friction into roller friction. Under the same pressure, the rolling friction is smaller than the sliding friction. Therefore, the simulated driving rod is preferably clamped by the clamping and positioning device, which is conducive to its smooth entry into the rod position detector. At the same time, the clamping and positioning device clamps through the roller, which is conducive to reducing the friction force on the simulated driving rod during the clamping process, thereby reducing the wear on the simulated driving rod, and can also reduce the resistance encountered by the driving device when the driving gear rotates.

[0015] Preferably, it further comprises a height adaptation device, which comprises a height adjustment member 1 and a height adjustment member 2, wherein the clamping alignment device is connected to the support frame via the height adjustment member 1, and the simulated driving rod is connected to the sliding plate via the height adjustment member 2.

[0016] Rod position detectors of different specifications have different sizes, and after being fixed to the rod position platform, the heights of the end faces of their inner cavities are different. The clamping alignment device is clamped at one end of the simulated drive rod close to the rod position platform, and the clamping alignment device is connected to the support frame through a height adjustment member 1; the simulated drive rod is connected to the sliding plate through a height adjustment member 2, thereby, by adjusting the telescopic height of the height adjustment member 1 and the height adjustment member 2, the height of the simulated drive rod can be adjusted so that it is aligned with the center of the inner cavity of the rod position detector in the height direction. It is preferred that the height of the simulated drive rod is adjusted by the height adjustment member 1 and the height adjustment member 2 together, so that the simulated drive rod can be raised and lowered smoothly, and it is avoided that when the height of the clamping alignment device is adjusted only by the height adjustment member 1, the simulated drive rod is easy to tilt, and then it is difficult to move smoothly in the horizontally placed rod position detector. The height adjustment member 1 and the height adjustment member 2 can both use hydraulic lifting columns of the prior art.

[0017] Preferably, it further comprises a sleeve member, the sleeve member comprising a fixing head for clamping and fixing to the rod position platform and a main sleeve body for inserting into the inner cavity of the rod position detector, the fixing head and the main sleeve body being detachably connected.

[0018] The preferred embodiment includes a sleeve member fixed to the rod position platform by a fixed head, and the sleeve member also includes a main sleeve body detachably connected to the fixed head, and the main sleeve body is used to be inserted into the inner cavity of the rod position detector, so that the simulated driving rod entering the rod position detector can be located in the inner cavity of the main sleeve body, which is conducive to preventing the simulated driving rod entering the rod position detector from bending down under the action of gravity, and then contacting the inner cavity of the rod position detector, causing the rod position detector to be worn. Further, the sleeve member is a non-metallic sleeve member, and the fixed head and the main sleeve body can be plugged in.

[0019] Preferably, the main sleeve body comprises a sleeve column and an abutment ring sleeved on the outer side of the sleeve column.

[0020] The abutment ring is used to loosely fit in the inner cavity of the rod position detector, thereby helping to reduce the contact area between the main sleeve and the inner cavity of the rod position detector, thereby allowing the main sleeve to enter the inner cavity of the rod position detector more smoothly.

[0021] Preferably, a limiting abutment block for limiting the sliding range of the sliding plate is installed on the support frame.

[0022] Therefore, in the process of controlling the movement of the sliding plate to drive the simulated driving rod to enter and exit the rod position detector, the sliding range of the sliding plate can be limited to prevent the sliding plate from detaching from the support frame during the detection process, thereby causing the gear to detach from the rack.

[0023] Preferably, retaining rings are provided at both ends of the roller in the axial direction for abutting against both sides of the analog driving rod in the radial direction.

[0024] This helps prevent the analog driving rod from being separated from the roller, and improves the stability of the roller clamping the analog driving rod.

[0025] The present invention has the following beneficial effects:

[0026] 1. The present invention can simulate the real driving rod to move at a certain speed and regularity relative to the rod position detector of the rod position system, and the rod position system detects the position information of the driving rod, and then performs the entire process of processing and transmission. During detection, the gear is rotated to drive the simulated driving rod to move, and the distance is compared with the rod position information output by the rod position system to obtain a more intuitive, real and comprehensive rod position system detection result compared with the existing technology, which is conducive to detecting problems that are difficult to detect with existing technologies, such as inaccurate and untimely feedback of rod position data due to factors such as the size of the driving rod and the specific movement law.

[0027] 2. The present invention drives the gear to rotate through a driving device, thereby driving the simulated driving rod to move. The meshing transmission of the gear and the rack enables the moving speed and moving law of the simulated driving rod to correspond to the rotation speed and rotation law of the gear in a timely and accurate manner. Compared with the scheme of friction transmission through devices such as conveyor belts that are prone to slip, this scheme can more accurately control the moving speed and moving law of the simulated driving rod, making the moving speed and moving law of the simulated driving rod closer to the moving speed and moving law of the real driving rod, thereby making the detection result more accurate.

[0028] 3. The present invention also includes two groups of rollers respectively abutting against the two sides of the height direction of the analog driving rod, which can clamp the end of the analog driving rod entering and exiting the rod position detector, so that it can smoothly enter the rod position detector. Moreover, the roller clamping is conducive to reducing the friction force on the analog driving rod during the clamping process, thereby reducing the wear on the analog driving rod, and can also reduce the resistance encountered by the driving gear of the driving device when rotating.

[0029] 4. Rod position detectors of different specifications have different sizes. After being fixed on the rod position platform, the height of the end face of the inner cavity is different. The present invention includes a height adaptation device, which can adjust the height of the simulated driving rod so that the simulated driving rod and the inner cavity of the rod position detector are aligned in the height direction, so that the simulated driving rod can smoothly enter the rod position detector.

[0030] 5. The present invention also includes a sleeve member, and the simulated driving rod entering the rod position detector can be located in the inner cavity of the main sleeve body of the sleeve member, which is beneficial to prevent the simulated driving rod entering the rod position detector from bending down under the action of gravity and then contacting the inner cavity of the rod position detector, causing the rod position detector to be worn. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0032] Figure 2 for Figure 1 A magnified top view of area A in the middle;

[0033] Figure 3 It is a partial formal diagram of the present invention;

[0034] Figure 4 It is a partial formal diagram of the present invention;

[0035] Figure 5 A front view of a sleeve member of the present invention;

[0036] Figure 6 It is a left schematic view of a roller provided with a retaining ring according to the present invention.

[0037] In the figure: 1 rod position detector, 2 rod position platform, 3 simulated driving rod, 4 rod position platform, 41 support frame, 42 sliding plate, 43 rack, 44 driving device, 45 gear, 5 clamping alignment device, 51 roller group, 511 roller, 512 retaining ring, 6 height adaptation device, 61 height adjustment part 1, 62 height adjustment part 2, 7 limit abutment block, 8 sleeve part, 81 fixed head, 82 main sleeve body, 821 sleeve column, 822 abutment ring. DETAILED DESCRIPTION

[0038] The following is a specific embodiment of the present invention and combined with the accompanying drawings to further describe the technical solution of the present invention, which is not a limitation of the present invention. After reading this specification, those skilled in the art can make non-creative modifications to the present embodiment as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

[0039] A detection system for a rod position system, such as Figure 1 , including a rod position platform 2 for fixing the rod position detector 1 and a rod position platform 4 for installing a simulated driving rod 3, wherein the outer dimensions of the simulated driving rod 3 are the same as those of the real driving rod, and the material of the simulated driving rod 3 is also the same as that of the real driving rod. Figure 2 and Figure 4 As shown, the rod position platform 4 includes a support frame 41 and a sliding plate 42 slidably connected to the support frame 41, one end of the simulated driving rod 3 away from the rod position detector 1 is installed on the sliding plate 42, and the other end enters and exits the rod position detector 1; the sliding plate 42 is fixed with a driving device 44, the driving end of the driving device 44 is connected with a gear 45, the support frame 41 is installed with a rack 43, and the gear 45 is meshed with the rack 43.

[0040] Specifically, the driving device 44 includes a servo motor and a reducer of the prior art, and the servo motor is connected to the PLC via a servo driver. The driving device 44 can drive the gear 45 to rotate at a certain speed and regularity to drive the sliding plate 42 to move, and then drive the simulated driving rod 3 fixed to the sliding plate 42 to move relative to the rod position detector 1 according to the moving speed and moving regularity of the real driving rod.

[0041] Therefore, the detection system can simulate the real driving rod to move at a certain speed and regularity relative to the rod position detector 1 of the rod position system, and the rod position system detects the position information of the driving rod, and then performs the entire process of processing and transmission. During the detection, the gear 45 is rotated to drive the simulated driving rod 3 to move, and the rod position information output by the rod position system is compared, so that a more intuitive, real and comprehensive rod position system detection result can be obtained compared with the existing technology, which is conducive to the detection of problems that are difficult to detect with existing technologies, such as inaccurate and untimely feedback of rod position data due to factors such as the size of the driving rod and the specific movement law.

[0042] During testing, the rod position detector 1 and the simulated driving rod 3 are both installed horizontally to adapt to the floor height of the existing factory building and to facilitate the disassembly and assembly of the rod position detector 1 and the simulated driving rod 3 .

[0043] The length of the real driving rod can reach five meters, so the length of the simulated driving rod 3 can also reach five meters. The longer simulated driving rod 3 is easy to shake, which makes it difficult to smoothly enter the rod position detector 1. In order to make the simulated driving rod 3 smoothly enter the rod position detector 1, Figure 3 The present invention further comprises a clamping alignment device 5, which is arranged at the support frame 41 near the rod position platform 2, and comprises two groups of roller groups 51, each group of roller groups 51 comprises two rollers 511 arranged along the length direction of the simulated driving rod 3, which are used to abut the simulated driving rod 3. The two groups of roller groups 51 abut against both sides of the height direction of the simulated driving rod 3, respectively, so that the end of the simulated driving rod 3 entering and exiting the rod position detector 1 can be aligned with the inner cavity opening of the rod position detector 1, which is conducive to the simulated driving rod 3 smoothly entering the rod position detector 1.

[0044] Further, such as Figure 6 , retaining rings 512 are provided at both ends of the roller 511 in the axial direction, for contacting the two radial sides of the analog driving rod 3. Thus, the analog driving rod 3 can be prevented from being separated from the roller 511 in its radial direction, which is conducive to improving the stability of the roller 511 clamping the analog driving rod 3.

[0045] Rod position detectors 1 of different specifications have different sizes. After being fixed to the rod position platform 2, the height of the end face of the inner cavity is different. Therefore, it is necessary to adjust the height of the simulated driving rod 3 according to different rod position detectors 1 so that the simulated driving rod 3 can smoothly enter the corresponding rod position detector 1. Preferably, the system also includes a height adaptation device 6, and the height adaptation device 6 includes a height adjustment member 1 61 and a height adjustment member 2 62. The clamping alignment device 5 is connected to the support frame 41 through the height adjustment member 1 61, and the simulated driving rod 3 is connected to the sliding plate 42 through the height adjustment member 2 62. Therefore, by adjusting the telescopic height of the height adjustment member 1 61 and the height adjustment member 2 62, the height of the simulated driving rod 3 can be adjusted so that it is aligned with the center of the rod position detector 1 in the height direction. The height adjustment member 1 61 and the height adjustment member 2 62 can both use hydraulic lifting devices of the prior art.

[0046] The present invention also includes a non-metallic sleeve member 8, such as Figure 5 The sleeve member 8 includes a fixed head 81 for clamping and fixing on the rod position platform 2 and a main sleeve body 82 for inserting into the inner cavity of the rod position detector 1. The main sleeve body 82 is plugged into the fixed head 81, and the simulated driving rod 3 entering the rod position detector 1 is located in the inner cavity of the main sleeve body 82, which prevents the simulated driving rod 3 entering the rod position detector 1 from bending down under the action of gravity, and then directly contacting the inner cavity of the rod position detector 1, causing the rod position detector 1 to be worn.

[0047] Furthermore, the main sleeve 82 includes a sleeve column 821 and a plurality of abutment rings 822 which are sequentially sleeved on the outer side of the sleeve column 821 along the length direction of the sleeve column 821. The main sleeve 82 is loosely fitted in the inner cavity of the rod position detector 1 through the abutment ring 822. Thus, the abutment ring 822 enables the main sleeve 82 to be stably placed in the inner cavity of the rod position detector 1 instead of being suspended in the air. Moreover, the preferred abutment ring 822 is conducive to reducing the contact area between the main sleeve 82 and the inner cavity of the rod position detector 1, thereby reducing friction, so that the main sleeve 82 can enter the inner cavity of the rod position detector 1 more smoothly.

[0048] In order to prevent the sliding plate 42 from detaching from the support frame 41 during the detection process, thereby causing the gear 45 to detach from the rack 43, and the sliding plate 42 cannot be driven to slide by the gear 45, it is preferred that a limiting abutment block 7 is installed on the support frame 41 to limit the sliding range of the sliding plate 42, so as to prevent the gear 45 from detaching from the rack 43.

[0049] The embodiments of the present invention described above and shown in the accompanying drawings are for illustrative purposes only and do not limit the present invention. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed or modified in any way.

Claims

1. A rod position system detection system, characterized in that: The rod position platform (2) comprises a rod position detector (1) for fixing the rod position platform (2) and a rod position platform (4) for installing a simulated driving rod (3), wherein the rod position platform (4) comprises a support frame (41) and a sliding plate (42) slidably connected to the support frame (41), and the simulated driving rod (3) is installed on the sliding plate (42); the rod position platform (4) further comprises a rack (43) installed on the support frame (41), a driving device (44) fixed to the sliding plate (42), and a gear (45) connected to the driving end of the driving device (44), and the gear (45) is meshed with the rack (43); It also comprises a sleeve member (8), the sleeve member (8) comprising a fixing head (81) for clamping and fixing to the rod position platform (2) and a main sleeve body (82) for inserting into the inner cavity of the rod position detector (1), the fixing head (81) and the main sleeve body (82) being detachably connected; The main sleeve body (82) comprises a sleeve column (821) and an abutment ring (822) sleeved on the outside of the sleeve column (821); It also comprises a clamping alignment device (5), the clamping alignment device (5) comprising two groups of roller groups (51), the roller groups (51) comprising rollers (511) for abutting against the analog driving rod (3), the two groups of roller groups (51) respectively abutting against two sides of the analog driving rod (3) in the height direction; It also comprises a height adaptation device (6), the height adaptation device (6) comprising a first height adjustment member (61) and a second height adjustment member (62), the clamping alignment device (5) is connected to the support frame (41) via the first height adjustment member (61), and the simulated driving rod (3) is connected to the sliding plate (42) via the second height adjustment member (62); During the specific test, the rod position detector (1) and the simulated driving rod (3) are both installed horizontally; By adjusting the telescopic height of the height adjustment member 1 (61) and the height adjustment member 2 (62), the height of the simulated driving rod (3) can be adjusted so that the center of the inner cavity of the rod position detector (1) is aligned in the height direction; The simulated driving rod (3) entering the rod position detector (1) is located in the inner cavity of the main sleeve (82), so as to prevent the simulated driving rod (3) entering the rod position detector (1) from bending downward under the action of gravity and directly contacting the inner cavity of the rod position detector (1), thereby causing the rod position detector (1) to be worn.

2. According to claim 1, a rod position system detection system is characterized in that: A limiting abutment block (7) for limiting the sliding range of the sliding plate (42) is installed on the support frame (41).

3. The rod position system detection system according to claim 1, characterized in that: Both ends of the roller (511) in the axial direction are provided with retaining rings (512) for contacting the two radial sides of the analog driving rod (3).

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