A nuclear fuel plate cladding thickness detection device

Abstract

The application discloses a kind of nuclear material plate cladding thickness detection devices, it includes from left to right sequentially arranged feed roller conveyor (1), support (2) and discharge roller conveyor (3), the front and rear ends of support (2) are provided with calibration assembly (4) and detection assembly (5), calibration assembly (4) includes driving motor (6) and two left and right opposite vertical plate (7) are set, two vertical plate (7) are all fixed on the top surface of support (2) and are set in the front side of feed roller conveyor (1), driving motor (6) is vertically arranged and is set in the front side of vertical plate (7), driving motor (6) is installed on the output shaft of rotary disc (8), and a plurality of standard zirconium piece clamping mechanisms (9) are provided on the edge of rotary disc (8) and along its circumferential direction.The beneficial effects of the present application are: compact structure, improve zirconium piece thickness detection efficiency, reduce detection cost, simple operation.

Description

Technical Field

[0001] This invention relates to the technical field of zirconium sheet thickness detection on nuclear fuel plates, and in particular to a device for detecting the thickness of nuclear fuel plate cladding. Background Technology

[0002] Nuclear fuel plates are elongated strips consisting of a central fuel layer and upper and lower zirconium cladding layers. The thickness of the zirconium cladding layer directly affects the safety of nuclear fuel plate use; therefore, the detection of zirconium cladding thickness during production is crucial. Due to the special processing technology, the interface between the zirconium cladding layer and the core is not clear, and traditional methods such as ultrasonic thickness measurement and eddy current measurement cannot accurately detect the cladding thickness. Existing mature technology utilizes beta rays released from the decay of the core to penetrate the cladding layer, and the cladding thickness is determined by the attenuation rate of the beta rays. However, current cladding thickness detection equipment on the market is mostly experimental prototypes, with low detection efficiency and no ability to automate measurements. Furthermore, excessive manual intervention makes it difficult to guarantee the repeatability of the equipment. Therefore, there is an urgent need for a detection device that improves the efficiency of zirconium sheet thickness detection and reduces detection costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a compact, efficient, cost-effective, and easy-to-operate device for detecting the thickness of the cladding on a core plate.

[0004] The objective of this invention is achieved through the following technical solution: a core plate cladding thickness detection device, comprising a feeding roller conveyor, a support, and a discharging roller conveyor arranged sequentially from left to right. The support has a calibration component and a detection component at its front and rear ends, respectively. The calibration component includes a drive motor and two opposing vertical plates, both fixed to the top surface of the support and positioned in front of the feeding roller conveyor. The drive motor is vertically positioned in front of the vertical plates. A turntable is mounted on the output shaft of the drive motor. Multiple standard zirconium sheet clamping mechanisms are arranged along the circumference of the turntable. Each standard zirconium sheet clamping mechanism includes a clamping... The device includes a holding cylinder, an upper clamping plate, and a lower clamping plate. The holding cylinder is fixed radially to the top surface of the turntable. The upper and lower clamping plates are fixed to the upper and lower connecting rods of the holding cylinder, respectively. Threaded holes I are provided at the four corners of the upper and lower clamping plates. The detection assembly includes a linear module, an upper detector, and a lower detector. The linear module is arranged longitudinally and is located on the rear side of the feed roller conveyor. A connecting frame is fixed to the nut of the linear module. The upper detector and the lower detector are provided at the front end of the connecting frame. The probes of the upper detector and the lower detector are arranged opposite each other vertically, and the area enclosed by the two probes is flush with the top surface of the roller of the feed roller conveyor.

[0005] Multiple threaded holes II are provided on the top surface of both upright plates.

[0006] The standard zirconium sheet clamping mechanism is evenly distributed on the turntable.

[0007] The base of the linear module is fixed on the top surface of the support.

[0008] The top surface of the rollers of the feed roller conveyor is flush with the top surface of the rollers of the discharge roller conveyor.

[0009] It also includes a host computer, and the output interfaces of the upper detector and the lower detector are both electrically connected to the input interface of the host computer.

[0010] The present invention has the following advantages: When β particles emitted by the same standard core are blocked by standard zirconium sheets of different thicknesses, the β count rate detected by the detector per unit time will also be different. Therefore, by calibrating in this way, the mapping relationship between different zirconium sheet thicknesses and the β particle count rate detected by the detector can be obtained, and the mapping relationship between the zirconium layer thickness value and the β particle count rate can be obtained. Therefore, the zirconium layer (cladding) thickness value at the point can be obtained based on the β particle count rate measured during the actual testing of the sample, thereby greatly improving the zirconium sheet thickness detection efficiency, reducing the detection cost, and simplifying the operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention;

[0012] Figure 2 for Figure 1 Top view;

[0013] Figure 3 This is a schematic diagram of the detection component.

[0014] Figure 4 for Figure 3 Side view;

[0015] Figure 5 This is a schematic diagram of the calibration component.

[0016] Figure 6 for Figure 5 Side view;

[0017] Figure 7 This is a schematic diagram of the feed roller conveyor device;

[0018] Figure 8 This is a schematic diagram of the support structure;

[0019] In the diagram, 1-feed roller conveyor, 2-support, 3-discharge roller conveyor, 4-calibration component, 5-detection component, 6-drive motor, 7-vertical plate, 8-turntable, 9-standard zirconium sheet clamping mechanism, 10-clamping cylinder, 11-upper clamping plate, 12-lower clamping plate, 13-linear module, 14-upper detector, 15-lower detector, 16-nut, 17-connecting frame, 18-roller, 19-standard core, 20-pressure bar II, 21-standard zirconium sheet A, 22-standard zirconium sheet clamping mechanism A, 23-pressure bar I, 24-standard zirconium sheet, 25-nuclear fuel plate to be tested. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description:

[0021] like Figures 1-8 As shown, a core plate cladding thickness detection device includes a feeding roller conveyor 1, a support 2, and a discharging roller conveyor 3 arranged sequentially from left to right. The support 2 has a calibration component 4 and a detection component 5 respectively located at its front and rear ends. The calibration component 4 includes a drive motor 6 and two opposing vertical plates 7, both fixed to the top surface of the support 2 and positioned in front of the feeding roller conveyor 1. The drive motor 6 is vertically positioned in front of the vertical plates 7. A turntable 8 is mounted on the output shaft of the drive motor 6. Multiple standard zirconium sheet clamping mechanisms 9 are arranged along the circumference of the turntable 8. The standard zirconium sheet clamping mechanisms 9 are evenly distributed on the turntable 8. Each standard zirconium sheet clamping mechanism 9 includes a clamping cylinder 10, an upper clamping plate 11, and a lower clamping plate 12. The clamping cylinder 10 is radially fixed to the top surface of the turntable 8, and the upper clamping plate 11 and lower clamping plate 12 are fixed to the upper and lower connecting rods of the clamping cylinder 10, respectively. Threaded holes I are provided at the four corners of the upper clamping plate 11 and the lower clamping plate 12. When the piston rod of the clamping cylinder 10 retracts, the piston rod drives the two connecting rods to move in opposite directions. The two connecting rods respectively drive the upper clamping plate 11 and the lower clamping plate 12 to move in opposite directions. When the piston rod of the clamping cylinder 10 extends, the upper clamping plate 11 and the lower clamping plate 12 move in opposite directions.

[0022] The detection component 5 includes a linear module 13, an upper detector 14, and a lower detector 15. The linear module 13 is arranged longitudinally and is located on the rear side of the feed roller conveyor 1. A connecting frame 17 is fixed on the nut 16 of the linear module 13. The upper detector 14 and the lower detector 15 are provided at the front end of the connecting frame 17. The probes of the upper detector 14 and the lower detector 15 are arranged opposite each other, and the area enclosed by the two probes is flush with the top surface of the roller 18 of the feed roller conveyor 1.

[0023] Multiple threaded holes II are provided on the top surfaces of both upright plates 7. The base of the linear module 13 is fixed on the top surface of the bracket 2. The top surface of the roller 18 of the feed roller conveyor 1 is flush with the top surface of the roller 18 of the discharge roller conveyor 3.

[0024] It also includes a host computer, and the output interfaces of the upper detector 14 and the lower detector 15 are both electrically connected to the input interface of the host computer.

[0025] The working process of this invention is as follows:

[0026] S1. The calibration of the standard zirconium sheet, the specific operating steps are as follows:

[0027] S11. Take a standard core 19 identical to the core inside the nuclear fuel plate to be tested. Place the standard core 19 flat between the two upright plates 7. Press the edge of the standard core 19 with a pressure strip II 20, and then use screws to pass through the pressure strip II 20 and thread it into the threaded hole II to fix the standard core 19 between the two upright plates 7. Figures 5-6 As shown;

[0028] S12. A standard zirconium sheet A21 of known thickness is attached to the outer end face of the upper clamping plate 11 of a standard zirconium sheet clamping mechanism A22. A pressure strip I23 is used to press the edge of the standard zirconium sheet A21, and a screw is used to pass through the pressure strip I23 and threaded into the threaded hole I on the upper clamping plate 11, thereby fixing the standard zirconium sheet A21 to the upper clamping plate 11. Another standard zirconium sheet A21 of the same thickness is attached to the outer end face of the lower clamping plate 12 of the standard zirconium sheet clamping mechanism A22. A pressure strip I23 is used to press the edge of the standard zirconium sheet A21, and a screw is used to pass through the pressure strip I23 and threaded into the threaded hole I on the lower clamping plate 12, thereby fixing the standard zirconium sheet A21 to the lower clamping plate 12. Thus, the two standard zirconium sheets A21 are finally fixed to the standard zirconium sheet clamping mechanism A22. Figures 5-6 As shown;

[0029] S13. Repeat step S12 to fix standard zirconium sheets 24 with different known thicknesses on other standard zirconium sheet clamping mechanisms 9. Figures 5-6 As shown, and ensure that the thickness of the standard zirconium sheets fixed on each standard zirconium sheet clamping mechanism 9 is not the same;

[0030] S14. The operator turns on the drive motor 6, which drives the turntable 8 to rotate at a certain angle. When the two standard zirconium sheets A21 on the standard zirconium sheet clamping mechanism A22 rotate to face the standard core 19, the operator turns off the drive motor 6. Then, the piston rod of the clamping cylinder 10 of the standard zirconium sheet clamping mechanism A22 is retracted. The piston rod drives the two connecting rods connected to it to move. The two connecting rods respectively drive the upper clamping plate 11 and the lower clamping plate 12 to close. The standard zirconium sheet A21 on the upper clamping plate 11 is attached to the top surface of the standard core 19, while the standard zirconium sheet A21 on the lower clamping plate 12 is attached to the bottom surface of the standard core 19.

[0031] S15. The operator turns on the servo motor of the linear module 13. The servo motor drives the lead screw to rotate, and the nut 16 moves forward along the lead screw. The nut 16 drives the connecting frame 17 and its upper detector 14 and lower detector 15 to move forward synchronously. When the probe of the upper detector 14 moves directly above the upper clamping plate 11 of the standard zirconium sheet clamping mechanism A22, and the probe of the lower detector 15 moves directly below the lower clamping plate 12 of the standard zirconium sheet clamping mechanism A22, the probe of the upper detector 14 detects the β particles that are spontaneously decayed and released from the standard core 19, and converts the β particle count rate into an electrical signal and transmits it to the host computer. At the same time, the probe of the lower detector 15 detects the β particles that are spontaneously decayed and released from the standard core 19, and converts the β particle count rate into an electrical signal and transmits it to the host computer, thereby detecting the β particle count rate under the thickness condition of the standard zirconium sheet A21.

[0032] S16. The operator controls the piston rod of the clamping cylinder 10 of the standard zirconium sheet clamping mechanism A22 to extend, the upper clamping plate 11 of the standard zirconium sheet clamping mechanism A22 moves upward and the lower clamping plate 12 moves downward. When the upper and lower clamping plates are reset, the operator controls the servo motor of the linear module 13 to reverse. The servo motor drives the lead screw to reverse, and the nut 16 moves backward along the lead screw. The nut 16 drives the connecting frame 17 and its upper detector 14 and lower detector 15 to move backward synchronously. When the upper detector 14 and lower detector 15 are reset, the servo motor is turned off.

[0033] S17. Repeat steps S14 to S16 to detect the β particle count rate under different standard zirconium sheet thicknesses. This will obtain the mapping relationship between different zirconium sheet thicknesses and the β particle count rate detected by the detector. Then, the mapping relationship between the zirconium sheet thickness value and the β particle count rate will be obtained, thus finally realizing the calibration of the standard zirconium sheet.

[0034] S18. After calibration, control the servo motor of the linear module 13 to reverse so that the upper detector 14 and the lower detector 15 are reset. After the reset, turn off the servo motor.

[0035] S2. The specific operating steps for detecting the thickness of the zirconium sheet on the nuclear fuel plate to be tested are as follows:

[0036] S21. The operator turns on the servo motor of the linear module 13. Nut 16 drives the upper detector 14 and the lower detector 15 to move forward synchronously. When the upper detector 14 and the lower detector 15 move between the roller 18 of the feed roller conveyor 1 and the roller 18 of the discharge roller conveyor 3, the servo motor is turned off. At this time, the area formed by the probes of the upper detector 14 and the lower detector 15 is on the same plane as the roller 18. Figures 1-2 As shown;

[0037] S21. The operator opens the feeding roller conveyor 1 and the discharging roller conveyor 3. The feeding roller conveyor 1 drives each roller 18 on it to rotate clockwise, while the discharging roller conveyor 3 drives each roller 18 on it to rotate clockwise.

[0038] S22. The operator places the nuclear fuel plate 25 to be tested flat on the roller 18 of the feed roller conveyor 1. The roller 18 conveys the nuclear fuel plate 25 to be tested to the right. After passing through the area formed by the probes of the upper detector 14 and the lower detector 15, the nuclear fuel plate 25 falls onto the roller 18 of the discharge roller conveyor 3. The roller 18 then conveys the nuclear fuel plate to the right. The nuclear fuel plate 25, when passing through the area formed by the probes of the upper detector 14 and the lower detector 15, as follows... Figures 1-2 As shown, the probe of the upper detector 14 detects β particles released from the spontaneous decay of the core in the nuclear fuel plate 25 to be detected, and converts the β particle count rate into an electrical signal and transmits it to the host computer. At the same time, the probe of the lower detector 15 detects β particles released from the spontaneous decay of the core in the nuclear fuel plate 25 to be detected, and converts the β particle count rate into an electrical signal and transmits it to the host computer.

[0039] S23. Based on the β particle count rate measured during actual testing and combined with the mapping relationship in step S17, the operator calculates the zirconium sheet thickness value of the nuclear fuel plate 25 to be tested at the detected β particle count rate. Therefore, this testing device replaces the use of expensive thickness testing equipment for testing, greatly saving testing costs.

[0040] S24. Repeating step S23 allows for continuous testing of multiple nuclear fuel plates. Therefore, compared to existing methods using thickness testing equipment, there is no need to fix the nuclear fuel plates to be tested with fixtures, saving time and enabling continuous testing of multiple nuclear fuel plates, thus greatly improving the efficiency of zirconium sheet thickness testing.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the thickness of a nuclear fuel plate cladding, wherein the nuclear fuel plate is a long strip plate composed of a middle fuel layer and upper and lower zirconium cladding layers, characterized in that: It includes a feeding roller conveyor (1), a support (2), and a discharging roller conveyor (3) arranged sequentially from left to right. The support (2) has a calibration component (4) and a detection component (5) at its front and rear ends, respectively. The calibration component (4) includes a drive motor (6) and two opposing vertical plates (7). Both vertical plates (7) are fixed to the top surface of the support (2) and positioned in front of the feeding roller conveyor (1). A standard core, identical to the core inside the core plate to be tested, is laid flat and fixed between the two vertical plates. The drive motor (6) is vertically positioned in front of the vertical plates (7). A turntable (8) is mounted on the output shaft of the drive motor (6). The turntable (8) has a disc on its edge. Multiple standard zirconium sheet clamping mechanisms (9) are arranged along its circumference. Each standard zirconium sheet clamping mechanism (9) includes a clamping cylinder (10), an upper clamping plate (11), and a lower clamping plate (12). The clamping cylinder (10) is radially fixed on the top surface of the turntable (8). The upper clamping plate (11) and the lower clamping plate (12) are respectively fixed on the upper and lower connecting rods of the clamping cylinder (10). Threaded holes I are provided at the four corners of the upper clamping plate (11) and the lower clamping plate (12). Two standard zirconium sheets of known thickness are fixed on the outer end faces of the upper and lower clamping plates of a standard zirconium sheet clamping mechanism. Standard zirconium sheets of different thicknesses are fixed on each standard zirconium sheet clamping mechanism. When the piston rod of the cylinder retracts, the piston rod drives the upper and lower connecting rods to move in opposite directions. The upper and lower connecting rods respectively drive the upper clamping plate and the lower clamping plate to close. The standard zirconium sheet on the upper clamping plate is attached to the top surface of the standard core, and the standard zirconium sheet on the lower clamping plate is attached to the bottom surface of the standard core. When the piston rod of the clamping cylinder extends, the upper clamping plate and the lower clamping plate move in opposite directions. The detection assembly (5) includes a linear module (13), an upper detector (14), and a lower detector (15). The linear module (13) is arranged in front and behind and is located on the rear side of the feed roller conveyor (1). A connecting frame (17) is fixed on the nut (16) of the linear module (13). The upper detector (15) is provided at the front end of the connecting frame (17). 4) The probes of the upper detector (14) and the lower detector (15) are set opposite each other. The probe of the upper detector moves to the upper clamping plate of the standard zirconium sheet clamping mechanism, and the probe of the lower detector moves to the lower clamping plate of the standard zirconium sheet clamping mechanism. The probes of the upper detector and the lower detector detect the β particles released spontaneously from the standard core, and convert the β particle count rate into an electrical signal and transmit it to the host computer to obtain the mapping relationship between the zirconium sheet thickness value and the β particle count rate. The area enclosed by the two probes is flush with the top surface of the roller (18) of the feed roller conveyor (1). The core material plate to be tested is placed flat on the roller of the feed roller conveyor.

2. The core plate cladding thickness detection device according to claim 1, characterized in that: Multiple threaded holes II are provided on the top surface of both upright plates (7).

3. The core plate cladding thickness detection device according to claim 1, characterized in that: The standard zirconium sheet clamping mechanism (9) is evenly distributed on the turntable (8).

4. The core plate cladding thickness detection device according to claim 1, characterized in that: The base of the linear module (13) is fixed on the top surface of the bracket (2).

5. The core plate cladding thickness detection device according to claim 1, characterized in that: The top surface of the roller (18) of the feed roller conveyor (1) is flush with the top surface of the roller (18) of the discharge roller conveyor (3).

6. The core plate cladding thickness detection device according to claim 1, characterized in that: It also includes a host computer, and the output interfaces of the upper detector (14) and the lower detector (15) are electrically connected to the input interface of the host computer.

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