Channel type double-station post-combustion fuel rod vertical X-ray CT detection device

Abstract

The invention provides a channel type double-station post-combustion fuel rod vertical X-ray CT detection device. The channel type double-station post-combustion fuel rod vertical X-ray CT detection device comprises an X-ray tube lifting and moving mechanism, a detector lifting and moving mechanism, a fuel rod detection sealing channel, a fuel rod clamping and rotating mechanism, a fuel rod lifting mechanism, a fuel rod ejection mechanism and a post-combustion nuclear fuel special-shaped part CT detection platform. The device can automatically detect a post-combustion fuel rod, meets the detection of other post-combustion nuclear fuel special-shaped parts, adopts double-station arrangement, greatly enlarges the detection range, is suitable for detection of more different types of workpieces, achieves the performance of one machine with multiple purposes in a specially-arranged detection chamber, greatly reduces the expenditure of additional equipment, saves the cost, and improves the detection efficiency. The device not only can be used for scientific research and development, but also can be widely applied to the detection field in a special environment, and is suitable for wide popularization.

Description

Technical Field

[0001] This patent relates to the field of X-ray CT non-destructive testing of post-burned fuel rods and post-burned nuclear fuel special-shaped parts, and specifically to a channel-type double-station vertical X-ray CT detection device for post-burned fuel rods. Background Art

[0002] Nuclear fuel rods are the heat-releasing units of a reactor and are its core components. Within the reactor, they are exposed to intense neutron fields, subjected to high temperatures, high pressures, and high-velocity coolant flows. They also endure chemical reactions from fissile materials, complex mechanical loads, and steam corrosion. These harsh operating conditions demand a high degree of reliability and safety from the fuel rods. Currently, domestic nuclear fuel rod end plug weld inspection focuses on passive fuel rod testing, performed before the reactor reacts. This is also known as pre-combustion testing. Pre-combustion testing can be performed under natural conditions and primarily utilizes traditional X-ray angular digital imaging to detect defects in pre-combustion fuel rods. Within a standard inspection chamber, a long pre-combustion fuel rod is placed horizontally on a rotating roller platform, which is then driven to rotate the rod. Imaging each pre-combustion fuel rod end plug weld requires two 120-degree rotations, totaling three exposures. This is complex and time-consuming. The post-combustion fuel rod itself is radioactive and cannot be excessively collided or rolled. CT inspection needs to be carried out under negative pressure conditions. The inspection space environment needs to be closed and isolated, and there must be a protective isolation room with sufficient radiation protection thickness. This is completely different from the condition constraints of pre-combustion fuel rod inspection. At present, there is no relevant technology for non-destructive inspection of post-combustion fuel rods by using a method of sealing a channel between a hot chamber and a CT inspection room. This requires combining the characteristics of the post-combustion fuel rod itself, the spatial characteristics of the closed inspection protection room, and the comprehensive cost characteristics to develop a new inspection device and inspection method to conduct inspection research on post-combustion fuel rods.

[0003] Researchers need to know the condition of spent fuel rods and spent fuel components after being subjected to the chemical action of strong neutron fission materials in the reactor, complex mechanical loads, erosion by high-temperature, high-pressure, and high-flow-rate coolants, and steam corrosion. At the same time, due to the particularity of the detection environment, a special detection chamber needs to be built underground. In addition, other special-shaped spent nuclear fuel components also need to be detected in the underground detection chamber. This requires the equipment to be suitable for detecting more different types of workpieces to increase the detection range and achieve the performance of multi-purpose use of one machine, so as to reduce the expenditure on additional equipment and save costs. Therefore, it is necessary to develop a new detection equipment that can detect both spent fuel rods and special-shaped spent nuclear fuel components to meet the detection needs. Through CT detection technology, the location, size, etc. of defects can be analyzed in detail to help researchers analyze the causes of defect formation and thus improve the process. These are all lacking and insufficient in the existing technology, and urgent technological innovation is needed according to special requirements. Summary of the Invention

[0004] To meet the needs and make up for the defects and deficiencies of the existing technology, this patent provides a channel-type double-station vertical X-ray CT detection device for spent fuel rods. This detection device can perform X-ray CT detection and X-ray DR detection, that is, it can meet both X-ray CT scanning detection and DR real-time imaging detection.

[0005] The spent fuel rods mentioned in the text and the fuel rods both refer to the same workpiece, and the fuel rod is a simplified name for the same workpiece.

[0006] The technical solution adopted in this patent is: a channel-type double-station vertical X-ray CT detection device for spent fuel rods, including: an X-ray tube lifting and moving mechanism, a detector lifting and moving mechanism, a fuel rod detection sealing channel, a fuel rod clamping and rotating mechanism, a fuel rod lifting mechanism, a fuel rod ejection mechanism, and a CT detection platform for special-shaped spent nuclear fuel components. The detection device is all arranged in an underground detection chamber. The X-ray tube lifting and moving mechanism and the detector lifting and moving mechanism are relatively arranged on both sides. At the left end of the middle part between the X-ray tube lifting and moving mechanism and the detector lifting and moving mechanism, there is a fuel rod clamping and rotating mechanism. At the upper end of the fuel rod clamping and rotating mechanism, there is a fuel rod detection sealing channel. At the lower end of the fuel rod clamping and rotating mechanism, there is a fuel rod ejection mechanism. At the right end of the middle part between the X-ray tube lifting and moving mechanism and the detector lifting and moving mechanism, there is a CT detection platform for special-shaped spent nuclear fuel components; The X-ray tube lifting and moving mechanism includes: a marble base one, a marble transverse body one, a marble column one, a servo motor one, a speed reducer one, a fixed-end bearing seat one, a coupling one, a combined bearing one, a ball screw one, a linear guide one, a guide rail slider one, a nut one, a nut seat one, a support-end bearing seat one, a deep groove ball bearing one, a 450KV X-ray tube, a 225KV micro-focus X-ray tube, a 225KV micro-focus X-ray tube fixed seat, a 450KV X-ray tube clamp, a 450KV X-ray tube grating, a ray source sliding support frame, a sliding support plate one, a slide plate one, and a shock-absorbing pad iron one; The marble base one is at the bottom layer, on which a slide plate one is installed. On the slide plate one, a marble transverse body one is installed. On the marble transverse body one, a sliding support plate one is connected. On the sliding support plate one, a marble column one is connected. On the marble column one, a servo motor one, a speed reducer one drive, a fixed-end bearing seat one, a coupling one, a ball screw one, a linear guide one, a guide rail slider one, a nut one, a nut seat one, a support-end bearing seat one, and a deep groove ball bearing one are installed from top to bottom and are connected and driven to each other. On the guide rail slider one, a ray source sliding support frame is installed. On the ray source sliding support frame, a 225KV micro-focus X-ray tube fixed seat and a 450KV X-ray tube clamp are installed. On the 225KV micro-focus X-ray tube fixed seat, a 225KV micro-focus X-ray tube is installed. On the 450KV X-ray tube clamp, a 450KV X-ray tube is installed. At the front end of the 450KV X-ray tube, a 450KV X-ray tube grating is provided. At the lower end of the marble base one, a shock-absorbing pad iron one is provided; The detector lifting and moving mechanism includes a marble base two, a marble transverse body two, a marble column two, a servo motor two, a speed reducer two, a fixed-end bearing seat two, a coupling two, a combined bearing two, a ball screw two, a linear guide two, a guide rail slider two, a nut two, a nut seat two, a support-end bearing seat two, a deep groove ball bearing two, a detector sliding support frame, a linear array detector protection box, a planar array detector protection box, an adjustable collimator, a double-acting grating, a planar array detector, a linear array detector, a sliding support plate two, a slide plate two, and a shock-absorbing pad iron two; The marble base two is at the bottom layer. A slide plate two is installed on the upper plane. A marble transverse movement body two is installed on the slide plate two. A sliding support plate two is connected to the marble transverse movement body two. A marble column two is installed on the sliding support plate two. A servo motor two, a speed reducer two, a fixed-end bearing seat two, a coupling two, a combined bearing two, a ball screw two, a linear guide two, a guide rail slider two, a nut two, a nut seat two, a support-end bearing seat two, and a deep groove ball bearing two are successively installed on the marble column two from top to bottom and are connected and driven to each other. A detector sliding support frame is installed on the guide rail slider two. A matrix detector protection box is installed at the upper end of the detector sliding support frame. A matrix detector is installed inside the matrix detector protection box. A double-acting grating is installed outside the matrix detector. The double-acting grating can electrically adjust the size of the ray receiving port according to the detection needs. A linear array detector protection box is installed at the lower end of the detector sliding support frame. A linear array detector is installed in the linear array detector protection box. An adjustable collimator is installed at the front end of the linear array detector. A shock-absorbing pad iron two is installed at the lower end of the marble base two; Among them, the fuel rod detection sealed channel includes: a hot cell floor connecting steel plate, a guiding flange A, a cover plate, a stainless steel bellows A, a connecting guiding flange, a stainless steel bellows B, a sealing cover, a rotary chuck, a connecting flange, a cross bearing, a guiding flange B, a locking flange A, a PC pipe, a guiding flange C, a main body support, a turntable sealing cover, a locking flange B, and a supporting main body box; the fuel rod detection sealed channel is mainly the fuel rod detection channel. From the hot cell floor to the underground jacking mechanism for detection, it is in a negative pressure state to prevent radioactive substances from flying out. The supporting main body box is installed and fixed on the embedded plate on the underground detection room floor. A main body support is installed on the supporting main body box. A turntable sealing cover is installed at the lower end of the main body support. A guiding flange C is installed on the turntable sealing cover. A guiding flange B is installed at the upper end of the main body support. The PC pipe is connected to the guiding flange B using the locking flange A, and the locking flange B is connected to the guiding flange C to form an X-ray detection position channel. A hot cell floor connecting steel plate and a cover plate are installed on the hot cell floor. A guiding flange A, a stainless steel corrugated plate A, a connecting guiding flange, a stainless steel corrugated plate B, a sealing cover, and a rotary chuck are installed between the hot cell floor connecting steel plate and the main body support; the cross bearing is installed on the main body support, and the sealing cover fixes the rotary chuck, the connecting flange, and the cross bearing on the main body support to form a sealed channel with the hot cell; Among them, the fuel rod clamping and rotating mechanism includes: a high-precision turntable A, a servo motor four, and a fixed pressing block; a high-precision turntable A is installed on the supporting main body box. A servo motor four is connected behind the high-precision turntable A to drive the high-precision turntable A to rotate. The rotary chuck is installed on the surface of the high-precision turntable A. The fixed pressing block is installed on the main body support. The fixed pressing block fixes the high-precision turntable A on the main body support and is sealed by the turntable sealing cover; Among them, the fuel rod lifting mechanism includes a lifting support plate, a servo motor five-coupling five, a combined bearing five, a ball screw five, a nut five, a nut seat five, a support end bearing seat five, a deep groove ball bearing five, a slide plate five, a pneumatic gripper, a linear guide five, a linear guide slider five, and a fixed end bearing seat five. The main function of the fuel rod lifting mechanism is to transport the fuel rod. An elevator support plate is installed on the inner side of the lower end of the support main box. A linear guide five, a linear guide slider five, a ball screw five, a fixed bearing seat support five, a deep groove ball bearing five, and a support end bearing seat five are installed on the elevator support plate. The servo motor five is connected in sequence to drive. A slide plate five is installed on the ball screw five, and a pneumatic gripper is installed on the slide plate five. The fuel rod lifting mechanism clamps the workpiece and moves up and down. Among them, the fuel rod ejection mechanism includes: a guide cylinder, a fixed flange, a slide column, a pulley, a steel wire rope, and a lift. The fuel rod ejection mechanism is an emergency mechanism. When the equipment fails or the fuel rod accidentally drops, the fuel rod ejection mechanism is activated to eject the fuel rod from the underground of the detection chamber through the sealed channel to the hot cell. The guide cylinder is fixed to the bottom plate of the support main box with a fixed flange and extends deep into the detection chamber pit. A slide column is installed in the guide cylinder, a pulley is installed on the slide column, one end of the slide column is connected with a steel wire rope, and the other end of the steel wire rope is connected to the lift, and the lift is fixed to the bottom plate of the support main box; the slide column can slide up and down in the guide cylinder under the action of the lift steel wire rope, and can eject the dropped fuel rod out of the detection chamber to the hot cell. Among them, the CT detection platform for post-burn nuclear fuel special-shaped parts includes: a marble body seven, a slide plate seven, a high-precision turntable B, a servo motor seven, a coupling seven, a combined bearing seven, a fixed end bearing seat seven, a nut seat seven, a nut seven, a deep groove ball bearing seven, a support end bearing seat seven, a linear guide seven, a slider seven, and a ball screw seven. The CT detection platform for post-burn nuclear fuel special-shaped parts is the CT station for post-burn nuclear fuel special-shaped parts. A marble body seven is installed on the support main box. A servo motor seven, a coupling seven, a combined bearing seven, a fixed end bearing seat seven, a nut seat seven, a nut seven, a deep groove ball bearing seven, a support end bearing seat seven, a linear guide seven, a slider seven, and a ball screw seven are installed on the marble body seven in sequence. A slide plate seven is connected and installed on the linear guide slider seven, and a high-precision turntable B is installed on the slide plate seven. The CT detection platform for post-burn nuclear fuel special-shaped parts can carry the workpiece to move horizontally and perform high-precision rotation.

[0007] The dual-ray tube combination method of installing a 450KV ray tube and a 225KV micro-focus X-ray tube together can switch different ray machines for inspection according to different detection requirements. In a special underground detection chamber, it achieves multiple functions with one machine and increases the detection range.

[0008] The combination of a two-detector system with an area array detector and a linear array detector installed together as the detection detectors allows for switching between different detectors according to different detection requirements. In a special underground detection room, it achieves multi-functionality with a single machine, enhancing detection accuracy and increasing the detection range.

[0009] Using marble material as the main material for the detection components can effectively prevent damage to the components caused by radiation, high temperature, etc.

[0010] The area array detector is installed inside the area array detector protection box, and a double-acting grating is installed in front of the area array detector. The double-acting grating can electrically adjust the size of the ray receiving port according to the detection needs, effectively protecting the service life of the electronic components of the area array detector and avoiding interference from special environments such as radiation and negative pressure.

[0011] The linear array detector is fixed inside the linear array detector protection box, effectively protecting the service life of the electronic components of the linear array detector and avoiding interference from special environments such as radiation and negative pressure.

[0012] The side walls of the area array detector protection box and the linear array detector protection box are made of a composite structure with a three-layer structure of steel plate + lead plate + silicon steel sheet.

[0013] A channel-type two-station post-burn fuel rod vertical X-ray CT detection device, and the detection method for the post-burn fuel rod: Step 1: The X-ray tube lifting and moving mechanism adjusts and positions. Select the X-ray tube according to the specifications of the workpiece to be detected, choose a 450KV X-ray tube or a 225KV micro-focus X-ray tube, and move to the initial detection position; Step 2: The detector lifting and moving mechanism adjusts and positions. Select the detector according to the specifications of the workpiece to be detected, choose an area array detector or a linear array detector as the detection detector, and move to the initial position corresponding to the X-ray tube; Step 3: The special transfer manipulator clamps the slender fuel rod through the fuel rod detection sealing channel in the hot cell onto the fuel rod clamping and rotating mechanism; Step 4: Turn on the X-ray tube and the detector, turn on the fuel rod clamping and rotating mechanism to rotate, and perform CT detection imaging by rotating the fuel rod workpiece. The workbench at the far end on the ground performs real-time image analysis and processing and archives; Step 5: Turn off the X-ray tube and the detector, stop the fuel rod clamping and rotating mechanism, the fuel rod lifting mechanism clamps the fuel rod, the fuel rod clamping and rotating mechanism releases the fuel rod, the fuel rod lifting mechanism drives the fuel rod to move up and down. After moving to the next detection position, the fuel rod clamping and rotating mechanism works, clamps the fuel rod, and the fuel rod lifting mechanism releases the fuel rod; Step 6: Turn on the ray tube and the detector again, select the operation of the fuel rod clamping and rotating mechanism, rotate the second position of the fuel rod workpiece for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives the images; Step 7: Repeat the operations in Step 3 to Step 6 until the detection of this fuel rod is completed. Turn off the ray source and the detector, release the fuel rod clamping and rotating mechanism, and the special conveying manipulator takes away the slender fuel rod.

[0014] A channel-type double-station post-irradiation fuel rod vertical X-ray CT detection device, and a detection method for post-irradiation nuclear fuel special-shaped parts: Step 1: Adjust and position the X-ray tube lifting and moving mechanism, select the ray tube according to the specifications of the workpiece to be detected, select a 450KV ray tube or a 225KV micro-focus X-ray tube, and move to the initial detection position; Step 2: Adjust and position the detector lifting and moving mechanism, select the detector according to the specifications of the workpiece to be detected, select an area array detector or a linear array detector as the detection detector, and move to the initial position corresponding to the ray tube; Step 3: The special conveying manipulator places the post-irradiation nuclear fuel special-shaped part on the high-precision turntable B of the post-irradiation nuclear fuel special-shaped part CT detection platform; Step 4: Turn on the ray tube and the detector, turn on the post-irradiation nuclear fuel special-shaped part CT detection platform, and rotate the post-irradiation nuclear fuel special-shaped part for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives the images; Step 5: After completing the detection of the post-irradiation nuclear fuel special-shaped part, turn off the ray source and the detector, stop the operation of the post-irradiation nuclear fuel special-shaped part CT detection platform, and the special conveying manipulator takes away the post-irradiation nuclear fuel special-shaped part.

[0015] The beneficial technical effects of this patent are: The present invention solves the defects and deficiencies of the prior art, provides a channel-type double-station post-irradiation fuel rod vertical X-ray CT detection device, which can automatically detect post-irradiation fuel rods, and at the same time meets the detection of other post-irradiation nuclear fuel special-shaped parts. With a double-station setting, the detection range is greatly increased, suitable for the detection of more different types of workpieces. It achieves the performance of multi-purpose in a specially designed detection room, greatly reducing the expenditure on additional equipment and saving costs. This device can not only be used for scientific research, but also be widely applicable to the detection field in special environments and is suitable for wide promotion. Brief Description of the Drawings

[0016] Figure 1 is the axonometric view of this device; Figure 2 is the front view of the whole machine of this device; Figure 3Front view of the X-ray tube lifting and moving mechanism of this device; Figure 4 is the front view of the detector lifting and moving mechanism of this device; Figure 5 Front view of the X-ray tube and detector moving mechanism of this device; Figure 6 Front view of the fuel rod detection sealing channel of this device; Figure 7 Cross-sectional view of the fuel rod detection sealing channel, fuel rod lifting mechanism, and fuel rod ejecting mechanism of this device; Figure 8 Partial view of the fuel rod rotation driving mechanism of this device; Figure 9 Partial view of the fuel rod rotation driven mechanism of this device; Figure 10 Top view of the CT detection platform for irregular-shaped post-irradiated nuclear fuel of this device; Figure 11 Cross-sectional view of the CT detection platform for irregular-shaped post-irradiated nuclear fuel of this device; In the figure: 1. X-ray tube lifting and moving mechanism; 2. Detector lifting and moving mechanism; 3. Fuel rod detection and sealing channel; 4. Fuel rod clamping and rotating mechanism; 5. Fuel rod lifting mechanism; 6. Fuel rod ejecting mechanism; 7. Post-irradiation nuclear fuel special-shaped part CT detection platform; 101. Marble base one; 102. Marble transverse moving fuselage one; 103. Marble column one; 104. Servo motor one; 105. Reducer one; 106. Fixed-end bearing seat one; 107. Coupling one; 108. Combined bearing one; 109. Ball screw one; 110. Linear guide one; 111. Guide rail slider one; 112. Nut one; 113. Nut seat one; 114. Support-end bearing seat one; 115. Deep groove ball bearing one; 116. 450KV X-ray tube; 117. 225KV micro-focus X-ray tube; 118. 225KV micro-focus X-ray tube fixed seat; 119. 450KV X-ray tube clamp; 120. 450KV X-ray tube grating; 121. Ray source sliding support frame; 122. Sliding support plate one; 123. Slide plate one; 124. Shock-absorbing pad iron one; 201. Marble base two; 202. Marble transverse moving fuselage two; 203. Marble column two; 204. Servo motor two; 205. Reducer two; 206. Fixed-end bearing seat two; 207. Coupling two; 208. Combined bearing two; 209. Ball screw two; 210. Linear guide two; 211. Guide rail slider two; 212. Nut two; 213. Nut seat two; 214. Support-end bearing seat two; 215. Deep groove ball bearing two; 216. Detector sliding support frame; 217. Linear array detector protection box; 218. Area array detector protection box; 219. Adjustable collimator; 220. Double-acting grating; 221. Area array detector; 222. Linear array detector; 223. Sliding support plate two; 204. Slide plate two; 225. Shock-absorbing pad iron two; 301. Hot cell floor connecting steel plate; 302. Guide flange A; 303. Cover plate; 304. Stainless steel bellows A; 305. Connecting guide flange; 306. Stainless steel bellows B; 307. Sealing cover; 308. Rotary chuck; 309. Adapter flange; 310. Cross bearing; 311. Guide flange B; 312. Locking flange A; 313. PC tube; 314. Guide flange C; 315. Main body support; 316. Turntable sealing cover; 317. Locking flange B; 318. Support main body box; 401. High-precision turntable A; 402. Servo motor four; 403. Fixed pressure block; 501. Lifting support plate; 502. Servo motor five; 503. Coupling five; 504. Combined bearing five; 505. Ball screw five; 506. Nut five; 507. Nut seat five; 508. Support-end bearing seat five; 509. Deep groove ball bearing five; 510. Slide plate five; 511. Pneumatic gripper; 512. Linear guide five; 513. Linear guide slider five; 514. Fixed-end bearing seat five; 601. Guide cylinder; 602. Fixed flange; 603. Slide post604. Pulley, 605. Steel wire rope, 606. Lift, 701. Marble body seven, 702. Slide plate seven, 703. High-precision turntable B, 704. Servo motor seven, 705. Coupling seven, 706. Combined bearing seven, 707. Fixed-end bearing seat seven, 708. Nut seat seven, 709. Nut seven, 710. Deep groove ball bearing seven, 711. Support-end bearing seat seven, 712. Linear guide seven, 713. Slide block seven, 714. Ball screw seven. Detailed implementation manners

[0017] The preferred implementation manners of this patent will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of this patent and are not intended to limit the protection scope of this patent.

[0018] A channel-type double-station post-burn fuel rod vertical X-ray CT detection device includes: an X-ray tube lifting and moving mechanism 1, a detector lifting and moving mechanism 2, a fuel rod detection sealing channel 3, a fuel rod clamping and rotating mechanism 4, a fuel rod lifting mechanism 5, a fuel rod ejecting mechanism 6, and a post-burn nuclear fuel special-shaped part CT detection platform 7. The detection device is arranged in an underground detection room. The X-ray tube lifting and moving mechanism 1 and the detector lifting and moving mechanism 2 are arranged opposite to each other on both sides. A fuel rod clamping and rotating mechanism 4 is provided at the left end of the middle part between the X-ray tube lifting and moving mechanism 1 and the detector lifting and moving mechanism 2. A fuel rod detection sealing channel 3 is provided above the fuel rod clamping and rotating mechanism 4. A fuel rod ejecting mechanism 6 is provided below the fuel rod clamping and rotating mechanism 4. A post-burn nuclear fuel special-shaped part CT detection platform 7 is provided at the right end of the middle part between the X-ray tube lifting and moving mechanism 1 and the detector lifting and moving mechanism 2.

[0019] The slender fuel rod passes through the fuel rod detection sealing channel 3 in the hot cell. The fuel rod clamping and rotating mechanism 4 drives the fuel rod to perform a CT rotation action. After a section of detection is completed, the fuel rod lifting mechanism 5 clamps the fuel rod, the fuel rod clamping and rotating mechanism 4 releases the fuel rod. The fuel rod lifting mechanism 5 drives the fuel rod to the next detection position, then the fuel rod clamping and rotating mechanism 4 clamps the fuel rod, and the fuel rod lifting mechanism 5 releases the fuel rod to perform the next section of fuel rod CT detection; when it is necessary to detect the post-burn nuclear fuel special-shaped part, the post-burn nuclear fuel special-shaped part to be detected is placed on the high-precision turntable 703 of the post-burn nuclear fuel special-shaped part CT detection platform 7, and the non-standard post-burn nuclear fuel special-shaped workpiece is subjected to CT detection by moving and rotating the high-precision turntable 703.

[0020] Among them, the X-ray tube lifting and moving mechanism 1 includes: marble base 101, marble cross-moving body 102, marble column 103, servo motor 104, reducer 105, fixed-end bearing block 106, coupling 107, combined bearing 108, ball screw 109, linear guide 110, guide rail slider 111, nut 112, nut seat 113, support-end bearing block 114, deep groove ball bearing 115, 450KV X-ray tube 116, 225KV micro-focus X-ray tube 117, 225KV micro-focus X-ray tube fixing seat 118, 450KV X-ray tube clamp 119, 450KV X-ray tube grating 120, ray source sliding support frame 121, sliding support plate 122, slide plate 123, shock-absorbing cushion iron 124; The marble base 101 is at the bottom layer, on which the slide plate 123 is installed. On the slide plate 123, the marble cross-moving body 102 is installed. On the marble cross-moving body 102, the sliding support plate 122 is connected. On the sliding support plate 122, the marble column 103 is connected. On the marble column 103, the servo motor 104, reducer 105 drive, fixed-end bearing block 106, coupling 107, ball screw 109, linear guide 110, guide rail slider 111, nut 112, nut seat 113, support-end bearing block 114, deep groove ball bearing 115 are installed in sequence from top to bottom and are connected and driven with each other. On the guide rail slider 111, the ray source sliding support frame 121 is installed. On the ray source sliding support frame 121, the 225KV micro-focus X-ray tube fixing seat 118 and 450KV X-ray tube clamp 119 are installed. On the 225KV micro-focus X-ray tube fixing seat 118, the 225KV micro-focus X-ray tube 117 is installed. On the 450KV X-ray tube clamp 119, the 450KV X-ray tube 116 is installed. At the front end of the 450KV X-ray tube 116, the 450KV X-ray tube grating 120 is provided. At the lower end of the marble base 101, the shock-absorbing cushion iron 124 is provided; The drive causes the marble cross-moving body 102 to carry the components above it and move along the front-back direction to adjust the distance between the X-ray tube and the workpiece to adjust the focal length. The sliding support plate 122 carries the components above it and moves along the left-right direction to adjust the left-right distance between the X-ray tube and the workpiece to adjust the alignment center, and switches to the detection position on the CT detection platform 7 for detecting the post-irradiation nuclear fuel special-shaped parts; the ray source sliding support frame 121 carries the components above it and moves along the up-down direction to adjust the height of the X-ray tube in real time to meet the detection requirements; The X-ray tube lifting and moving mechanism 1 can drive the X-ray source to switch arbitrarily between the fuel rod detection station and the post-irradiation nuclear fuel special-shaped part detection station. The 450KV X-ray tube 116 is fixed on the ray source sliding support frame 121 by the 450KV X-ray tube clamp 119. The 225KV micro-focus X-ray tube 117 is fixed on the ray source sliding support frame 121 by the 225KV micro-focus X-ray tube fixing seat 118 and is arranged vertically above and below the 450KV X-ray tube 119.

[0021] Among them, the detector lifting and moving mechanism includes a marble base two 201, a marble transverse moving body two 202, a marble column two 203, a servo motor two 204, a reducer two 205, a fixed-end bearing seat two 206, a coupling two 207, a combined bearing two 208, a ball screw two 209, a linear guide two 210, a guide rail slider two 211, a nut two 212, a nut seat two 213, a support-end bearing seat two 214, a deep groove ball bearing two 215, a detector sliding support frame 216, a linear array detector protection box 217, a planar array detector protection box 218, an adjustable collimator 219, a double-acting grating 220, a planar array detector 221, a linear array detector 222, a sliding support plate two 223, a slide plate two 224, a shock-absorbing pad iron two 225; The marble base two 201 is at the bottom layer, and a slide plate two 224 is installed on the upper plane. A marble transverse moving body two 202 is installed on the slide plate two 224. A sliding support plate two 223 is connected to the marble transverse moving body two 202. A marble column two 203 is installed on the sliding support plate two 223. A servo motor two 204, a reducer two 205, a fixed-end bearing seat two 206, a coupling two 207, a combined bearing two 208, a ball screw two 209, a linear guide two 210, a guide rail slider two 211, a nut two 212, a nut seat two 213, a support-end bearing seat two 214, and a deep groove ball bearing two 215 are installed on the marble column two 203 from top to bottom and are connected and driven to each other. A detector sliding support frame 216 is installed on the guide rail slider two 211. A planar array detector protection box 218 is installed at the upper end of the detector sliding support frame 216. A planar array detector 221 is installed inside the planar array detector protection box 218. A double-acting grating 220 is installed outside the planar array detector 221. The double-acting grating 220 can electrically adjust the size of the ray receiving port according to the detection needs. A linear array detector protection box 222 is installed at the lower end of the detector sliding support frame 216. A linear array detector 222 is installed in the linear array detector protection box 222. An adjustable collimator 219 is installed at the front end of the linear array detector 222. A shock-absorbing pad iron two 225 is installed at the lower end of the marble base two 201; The marble transverse moving body 202 is carried by the slide plate 224 to move the components above it in the front-back direction, adjusting the distance between the detector and the workpiece. The sliding support plate 223 carries the components above it to move in the left-right direction, adjusting the left-right distance between the detector and the workpiece to adjust and align the center, and switching to the detection position on the CT detection platform 7 for detecting the special-shaped post-burn nuclear fuel components. The components on the bearing surface of the detector sliding support frame 216 move in the up-down direction to adjust the height of the detector in real time to meet the detection requirements.

[0022] The area array detector 221 is arranged inside the area array detector protection box 218, and a double-acting grating 220 is installed in front of the area array detector 221. The double-acting grating 220 can electrically adjust the size of the ray receiving port according to the detection needs, effectively protecting the service life of the electronic components of the area array detector 221 and avoiding interference from special environments such as radiation and negative pressure.

[0023] The linear array detector 222 is fixed inside the linear array detector protection box 217, effectively protecting the service life of the electronic components of the linear array detector 222 and avoiding interference from special environments such as radiation and negative pressure.

[0024] The side walls of the area array detector protection box 218 and the linear array detector protection box 217 are made of a composite structure with a three-layer structure of steel plate + lead plate + silicon steel sheet.

[0025] Among them, the fuel rod detection sealing channel 3 includes: the hot cell floor connecting steel plate 301, the guiding flange A 302, the cover plate 303, the stainless steel bellows A 304, the connecting guiding flange 305, the stainless steel bellows B 306, the sealing cover 307, the rotary chuck 308, the adapter flange 309, the cross bearing 310, the guiding flange B 311, the locking flange A 312, the PC pipe 313, the guiding flange C 314, the main body support 315, the turntable sealing cover 316, the locking flange B 317, and the supporting main body box 318; the fuel rod detection sealing channel 3 is mainly a fuel rod detection channel, and the state from the hot cell floor to the underground jacking mechanism inside the detection is negative pressure to prevent radioactive substances from flying out. The supporting main body box 318 is installed and fixed on the embedded plate on the underground detection room floor. The main body support 315 is installed on the supporting main body box 318. The turntable sealing cover 316 is installed at the lower end of the main body support 315. The guiding flange C 314 is installed on the turntable sealing cover 316. The guiding flange B 311 is installed at the upper end of the main body support 315. The PC pipe 313 is connected to the guiding flange B 311 using the locking flange A 312, and the locking flange B 317 is connected to the guiding flange C 314 to form an X-ray detection position channel. The hot cell floor connecting steel plate 301 and the cover plate 303 are installed on the hot cell floor. The guiding flange A 302, the stainless steel corrugated plate A 304, the connecting guiding flange 305, the stainless steel corrugated plate B 306, the sealing cover 307, and the rotary chuck 308 are installed between the hot cell floor connecting steel plate 301 and the main body support 315; the cross bearing 310 is installed on the main body support 315, and the sealing cover 307 fixes the rotary chuck 308, the adapter flange 309, and the cross bearing 310 on the main body support 315 to form a sealing channel with the hot cell.

[0026] Among them, the fuel rod clamping and rotating mechanism includes: the high-precision turntable A 401, the servo motor four 402, and the fixed pressing block 403; the high-precision turntable A 401 is installed on the supporting main body box 318. The servo motor four 402 is connected behind the high-precision turntable A 401 to drive the high-precision turntable A 401 to rotate. The rotary chuck 308 is installed on the surface of the high-precision turntable A 401. The fixed pressing block 403 is installed on the main body support 315, and the fixed pressing block 403 fixes the high-precision turntable A 401 on the main body support 315 and is sealed by the turntable sealing cover 316.

[0027] Among them, the fuel rod lifting mechanism 5 includes a lifting support plate 501, a servo motor five 502, a coupling five 503, a combined bearing five 504, a ball screw five 505, a nut five 506, a nut seat five 507, a support end bearing seat five 508, a deep groove ball bearing five 509, a slide plate five 510, a pneumatic gripper 511, a linear guide five 512, a linear guide slider five 513, and a fixed end bearing seat five 514. The main function of the fuel rod lifting mechanism 5 is to transport the fuel rod. A lifting support plate 501 is installed inside the lower end of the support main body box 318. The lifting support plate 501 is equipped with a linear guide five 512, a linear guide slider five 513, a ball screw five 505, a fixed bearing seat support five 514, a deep groove ball bearing five 509, and a support end bearing seat five 508. The servo motor five 502 is connected in sequence for driving. A slide plate five 510 is installed on the ball screw five 505, and a pneumatic gripper 511 is installed on the slide plate five 510. After the fuel rod lifting mechanism 5 clamps the workpiece, it moves up and down.

[0028] Among them, the fuel rod ejection mechanism 6 includes a guide cylinder 601, a fixed flange 602, a slide column 603, a pulley 604, a steel wire rope 605, and a lifter 606. The fuel rod ejection mechanism is an emergency mechanism. When the equipment fails or the fuel rod accidentally drops, the fuel rod ejection mechanism is activated to eject the fuel rod from under the inspection chamber through the sealed channel to the hot cell. The guide cylinder 601 is fixed to the bottom plate of the support main body box 318 with the fixed flange 602 and extends deep into the inspection chamber pit. A slide column 603 is installed inside the guide cylinder 601. A pulley 604 is installed on the slide column 603. One end of the slide column 603 is connected with a steel wire rope 605, and the other end of the steel wire rope 605 is connected to the lifter 606. The lifter 606 is fixed to the bottom plate of the support main body box 318. The slide column 603 can slide up and down inside the guide cylinder 601 under the action of the steel wire rope 605 of the lifter 606, and can eject the dropped fuel rod from the inspection chamber to the hot cell.

[0029] Among them, the CT detection platform 7 for post-burn nuclear fuel special-shaped parts includes: a marble body 701, a slide plate 702, a high-precision turntable B 703, a servo motor 704, a coupling 705, a combined bearing 706, a fixed-end bearing seat 707, a nut seat 708, a nut 709, a deep groove ball bearing 710, a support-end bearing seat 711, a linear guide 712, a slider 713, and a ball screw 714; the CT detection platform 7 for post-burn nuclear fuel special-shaped parts is the CT station for post-burn nuclear fuel special-shaped parts. A marble body 701 is installed on the support main body box 318. On the marble body 701, a servo motor 704, a coupling 705, a combined bearing 706, a fixed-end bearing seat 707, a nut seat 708, a nut 709, a deep groove ball bearing 710, a support-end bearing seat 711, a linear guide 712, a slider 713, and a ball screw 714 are successively installed. A slide plate 702 is connected and installed on the linear guide slider 713. A high-precision turntable B 703 is installed on the slide plate 702. The CT detection platform 7 for post-burn nuclear fuel special-shaped parts can carry the workpiece to move horizontally and perform high-precision rotation.

[0030] Adopting the combined double-ray tube method of installing the 450KV ray tube 116 and the 225KV micro-focus X-ray tube 117 together, different ray machines can be switched for inspection according to different detection requirements. In a special underground detection room, it can achieve multiple functions with one machine, increasing the detection range.

[0031] Adopting the combined double-detector method of installing the area array detector 221 and the linear array detector 222 as detection detectors together, different detectors can be switched for inspection according to different detection requirements. In a special underground detection room, it can achieve multiple functions with one machine, enhancing the detection accuracy and increasing the detection range.

[0032] Using marble material as the main material for the detection components can effectively prevent damage to the components caused by radiation, high temperature, etc.

[0033] A channel-type double-station vertical X-ray CT detection device for post-burn fuel rods. Among them, the detection method for post-burn fuel rods: The first step: The X-ray tube lifting and moving mechanism 1 adjusts and positions. Select the ray tube according to the specifications of the workpiece to be detected, select the 450KV ray tube 116 or the 225KV micro-focus X-ray tube 117, and move to the initial detection position; The second step: The detector lifting and moving mechanism 2 adjusts and positions. Select the detector according to the specifications of the workpiece to be detected, select the area array detector 221 or the linear array detector 222 as the detection detector, and move to the initial position corresponding to the ray tube; The third step: The slender fuel rod is clamped on the fuel rod clamping and rotating mechanism 4 by the special conveying manipulator through the fuel rod detection sealing channel 3 in the hot cell; Step 4: Turn on the ray tube and the detector, turn on the fuel rod clamping and rotating mechanism 4 to rotate, and rotate the fuel rod workpiece for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives the images; Step 5: Turn off the ray tube and the detector, stop the fuel rod clamping and rotating mechanism 4, the fuel rod lifting mechanism 5 clamps the fuel rod, the fuel rod clamping and rotating mechanism 4 releases the fuel rod, the fuel rod lifting mechanism 5 drives the fuel rod to move up and down. After moving to the next detection position, the fuel rod clamping and rotating mechanism 4 operates to clamp the fuel rod, and the fuel rod lifting mechanism 5 releases the fuel rod; Step 6: Turn on the ray tube and the detector again, turn on the fuel rod clamping and rotating mechanism 4 to rotate, and rotate the fuel rod workpiece at the second position for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives the images; Step 7: Repeat the operations in Step 3 to Step 6 until the detection of this fuel rod is completed. Turn off the radiation source and the detector, release the fuel rod clamping and rotating mechanism 4, and the special conveying manipulator takes away the slender fuel rod.

[0034] A channel-type double-station post-irradiation fuel rod vertical X-ray CT detection device, and a detection method for post-irradiation nuclear fuel special-shaped parts: Step 1: The X-ray tube lifting and moving mechanism 1 adjusts the position. Select the ray tube according to the specifications of the workpiece to be detected, and select the 450KV ray tube 116 or the 225KV micro-focus X-ray tube 117, and move to the initial detection position; Step 2: The detector lifting and moving mechanism 2 adjusts the position. Select the detector according to the specifications of the workpiece to be detected, and select the area array detector 221 or the linear array detector 222 as the detection detector, and move to the initial position corresponding to the ray tube; Step 3: The special conveying manipulator places the post-irradiation nuclear fuel special-shaped part on the high-precision turntable B703 of the post-irradiation nuclear fuel special-shaped part CT detection platform 7; Step 4: Turn on the ray tube and the detector, turn on the post-irradiation nuclear fuel special-shaped part CT detection platform 7, and rotate the post-irradiation nuclear fuel special-shaped part for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives the images; Step 5: After completing the detection of the post-irradiation nuclear fuel special-shaped part, turn off the radiation source and the detector, stop the post-irradiation nuclear fuel special-shaped part CT detection platform 7, and the special conveying manipulator takes away the post-irradiation nuclear fuel special-shaped part.

[0035] Although this patent has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of this patent. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. This patent is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0036] In the description of this patent, the terms "upper", "lower", "left", "right", "horizontal", "inner", "outer", "one end", "the other end", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this patent. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In addition, it should be noted that in the description of this patent, unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0038] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A channel - type double - station post - combustion fuel rod vertical X - ray CT detection device, characterized in that: Comprising: An X-ray tube lifting and moving mechanism, a detector lifting and moving mechanism, a fuel rod detection sealing channel, a fuel rod clamping and rotating mechanism, a fuel rod lifting mechanism, a fuel rod ejecting mechanism, and a CT detection platform for post-irradiated nuclear fuel special-shaped parts. All the detection devices are arranged in an underground detection room. The X-ray tube lifting and moving mechanism and the detector lifting and moving mechanism are relatively arranged on both sides. A fuel rod clamping and rotating mechanism is provided at the left end of the middle part between the X-ray tube lifting and moving mechanism and the detector lifting and moving mechanism. A fuel rod detection sealing channel is provided above the fuel rod clamping and rotating mechanism. A fuel rod ejecting mechanism is provided below the fuel rod clamping and rotating mechanism. A CT detection platform for post-irradiated nuclear fuel special-shaped parts is provided at the right end of the middle part between the X-ray tube lifting and moving mechanism and the detector lifting and moving mechanism; The X-ray tube lifting and moving mechanism includes: a marble base one, a marble transverse moving body one, a marble column one, a servo motor one, a speed reducer one, a fixed-end bearing seat one, a coupling one, a combined bearing one, a ball screw one, a linear guide one, a guide rail slider one, a nut one, a nut seat one, a support-end bearing seat one, a deep groove ball bearing one, a 450KV X-ray tube, a 225KV micro-focus X-ray tube, a 225KV micro-focus X-ray tube fixed seat, a 450KV X-ray tube clamp, a 450KV X-ray tube grating, a ray source sliding support frame, a sliding support plate one, a slide plate one, and a shock-absorbing pad iron one; The marble base one is at the bottom layer, and a slide plate one is installed on it. A marble transverse moving body one is installed on the slide plate one. A sliding support plate one is connected to the marble transverse moving body one. A marble column one is connected to the sliding support plate one. A servo motor one, a speed reducer one drive, a fixed-end bearing seat one, a coupling one, a ball screw one, a linear guide one, a guide rail slider one, a nut one, a nut seat one, a support-end bearing seat one, and a deep groove ball bearing one are sequentially installed on the marble column one from top to bottom and are connected and driven to each other; A ray source sliding support frame is installed on the guide rail slider one. A 225KV micro-focus X-ray tube fixed seat and a 450KV X-ray tube clamp are installed on the ray source sliding support frame. A 225KV micro-focus X-ray tube is installed on the 225KV micro-focus X-ray tube fixed seat. A 450KV X-ray tube is installed on the 450KV X-ray tube clamp. A 450KV X-ray tube grating is provided at the front end of the 450KV X-ray tube; A shock-absorbing pad iron one is provided at the lower end of the marble base one; The detector lifting and moving mechanism includes a marble base two, a marble transverse moving body two, a marble column two, a servo motor two, a speed reducer two, a fixed-end bearing seat two, a coupling two, a combined bearing two, a ball screw two, a linear guide two, a guide rail slider two, a nut two, a nut seat two, a support-end bearing seat two, a deep groove ball bearing two, a detector sliding support frame, a linear array detector protection box, a planar array detector protection box, an adjustable collimator, a double-acting grating, a planar array detector, a linear array detector, a sliding support plate two, a slide plate two, and a shock-absorbing pad iron two; The marble base two is at the bottommost layer. A slide plate two is installed on its upper plane. A marble transverse moving fuselage two is installed on the slide plate two. A sliding support plate two is connected to the marble transverse moving fuselage two. A marble column two is installed on the sliding support plate two. A servo motor two, a speed reducer two, a fixed-end bearing seat two, a coupling two, a combined bearing two, a ball screw two, a linear guide two, a guide rail slider two, a nut two, a nut seat two, a support-end bearing seat two, and a deep groove ball bearing two are successively installed on the marble column two from top to bottom and are connected and driven to each other. A detector sliding support frame is installed on the guide rail slider two. A matrix detector protection box is installed at the upper end of the detector sliding support frame. A matrix detector is installed inside the matrix detector protection box. A double-acting grating is installed outside the matrix detector. The double-acting grating can electrically adjust the size of the ray receiving port according to the detection needs. A linear array detector protection box is installed at the lower end of the detector sliding support frame. A linear array detector is installed in the linear array detector protection box. An adjustable collimator is installed at the front end of the linear array detector. A shock-absorbing pad iron two is installed at the lower end of the marble base two; Among them, the fuel rod detection sealing channel includes: a hot cell floor connecting steel plate, a guiding flange A, a cover plate, a stainless steel bellows A, a connecting guiding flange, a stainless steel bellows B, a sealing cover, a rotary chuck, a transfer flange, a cross bearing, a guiding flange B, a locking flange A, a PC pipe, a guiding flange C, a main body support, a turntable sealing cover, a locking flange B, and a support main body box. The fuel rod detection sealing channel is mainly a fuel rod detection channel. From the hot cell floor to the inside of the detection underground lifting mechanism, it is in a negative pressure state to prevent radioactive substances from flying out. The support main body box is installed and fixed on the embedded plate on the underground detection room floor. A main body support is installed on the support main body box. A turntable sealing cover is installed at the lower end of the main body support. A guiding flange C is installed on the turntable sealing cover. A guiding flange B is installed at the upper end of the main body support. The PC pipe is connected to the guiding flange B using the locking flange A, and the locking flange B is connected to the guiding flange C to form an X-ray detection position channel. A hot cell floor connecting steel plate and a cover plate are installed on the hot cell floor. A guiding flange A, a stainless steel corrugated plate A, a connecting guiding flange, a stainless steel corrugated plate B, a sealing cover, and a rotary chuck are installed between the hot cell floor connecting steel plate and the main body support. The cross bearing is installed on the main body support. The sealing cover fixes the rotary chuck, the transfer flange, and the cross bearing on the main body support to form a sealed channel with the hot cell; Among them, the fuel rod clamping and rotating mechanism includes: a high-precision turntable A, a servo motor four, and a fixed pressing block. A high-precision turntable A is installed on the support main body box. A servo motor four is connected behind the high-precision turntable A to drive the high-precision turntable A to rotate. The rotary chuck is installed on the surface of the high-precision turntable A. The fixed pressing block is installed on the main body support. The fixed pressing block fixes the high-precision turntable A on the main body support and is sealed by the turntable sealing cover; Among them, the fuel rod lifting mechanism includes a lifting support plate, a servo motor five, a coupling five, a combined bearing five, a ball screw five, a nut five, a nut seat five, a support end bearing seat five, a deep groove ball bearing five, a slide plate five, a pneumatic gripper, a linear guide five, a linear guide slider five, and a fixed end bearing seat five. The main function of the fuel rod lifting mechanism is to transport the fuel rod. An elevator support plate is installed on the inner side of the lower end of the support main box. The linear guide five, the linear guide slider five, the ball screw five, the fixed bearing seat support five, the deep groove ball bearing five, and the support end bearing seat five are installed on the elevator support plate. The servo motor five is connected in sequence to drive. A slide plate five is installed on the ball screw five, and a pneumatic gripper is installed on the slide plate five. After the fuel rod lifting mechanism clamps the workpiece, it moves up and down. Among them, the fuel rod ejection mechanism includes: a guide cylinder, a fixed flange, a slide column, a pulley, a steel wire rope, and a lift. The fuel rod ejection mechanism is an emergency mechanism. When the equipment fails or the fuel rod accidentally drops, the fuel rod ejection mechanism is activated to eject the fuel rod from the underground of the detection chamber through the sealed channel to the hot chamber. The guide cylinder is fixed on the bottom plate of the support main box with a fixed flange and extends deep into the detection chamber pit. A slide column is installed in the guide cylinder, a pulley is installed on the slide column, one end of the slide column is connected with a steel wire rope, and the other end of the steel wire rope is connected with the lift, and the lift is fixed on the bottom plate of the support main box; the slide column can slide up and down in the guide cylinder under the action of the lift steel wire rope, and can eject the dropped fuel rod from the detection chamber to the hot chamber. Among them, the post-burn nuclear fuel special-shaped part CT detection platform includes: a marble body seven, a slide plate seven, a high-precision turntable B, a servo motor seven, a coupling seven, a combined bearing seven, a fixed end bearing seat seven, a nut seat seven, a nut seven, a deep groove ball bearing seven, a support end bearing seat seven, a linear guide seven, a slider seven, and a ball screw seven. The post-burn nuclear fuel special-shaped part CT detection platform is the CT station for post-burn nuclear fuel special-shaped parts. A marble body seven is installed on the support main box. The servo motor seven, the coupling seven, the combined bearing seven, the fixed end bearing seat seven, the nut seat seven, the nut seven, the deep groove ball bearing seven, the support end bearing seat seven, the linear guide seven, the slider seven, and the ball screw seven are installed on the marble body seven in sequence. A slide plate seven is connected and installed on the linear guide slider seven, and a high-precision turntable B is installed on the slide plate seven. The post-burn nuclear fuel special-shaped part CT detection platform can carry the workpiece to move horizontally and perform high-precision rotation.

2. The vertical X-ray CT inspection device for post-burning fuel rods with a channel-type double-station according to claim 1, wherein: Adopt a combined double-ray tube method with a 450KV ray tube and a 225KV micro-focus X-ray tube installed together.

3. A channel-type two-station post-burning fuel rod vertical X-ray CT inspection device according to claim 1, characterized in that: Adopt a combined double-detector method with a matrix detector and a linear array detector installed as detection detectors together.

4. A channel-type two-station post-burning fuel rod vertical X-ray CT detection device according to claim 1, characterized in that: Adopt marble material as the main material for the detection components.

5. The vertical X-ray CT inspection device for post-burning fuel rods with a channel-type double-station according to claim 1, characterized in that: The matrix detector is arranged inside the matrix detector protection box, and a double-acting grating is installed in front of the matrix detector. The double-acting grating can electrically adjust the size of the ray receiving port according to the detection needs.

6. The vertical X-ray CT inspection device for post-burning fuel rods with a channel type and two working positions according to claim 1, characterized in that: The linear array detector is fixed inside the linear array detector protection box.

7. The vertical X-ray CT inspection device for post-burning fuel rods with a channel type double-station according to claim 1, characterized in that: Among them, the side walls of the matrix detector protection box and the linear array detector protection box are made of a composite structure of a three-layer structure of steel plate + lead plate + silicon steel sheet.

8. A channel-type double-station post-burning fuel rod vertical X-ray CT detection device according to claim 1, characterized in that: A channel-type double-station post-burn fuel rod vertical X-ray CT detection device, and the detection method for post-burn fuel rods: First step: The X-ray tube lifting and moving mechanism is adjusted and positioned. Select the X-ray tube according to the specifications of the workpiece to be detected, and choose a 450KV X-ray tube or a 225KV micro-focus X-ray tube, and move to the initial detection position; Second step: The detector lifting and moving mechanism is adjusted and positioned. Select the detector according to the specifications of the workpiece to be detected, and choose an area array detector or a linear array detector as the detection detector, and move to the initial position corresponding to the X-ray tube; Third step: The special conveying manipulator clamps the slender fuel rod through the fuel rod detection sealing channel in the hot cell on the fuel rod clamping and rotating mechanism; Fourth step: Turn on the X-ray tube and the detector, turn on the fuel rod clamping and rotating mechanism to rotate, and rotate the fuel rod workpiece for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives; Fifth step, turn off the X-ray tube and the detector, stop the fuel rod clamping and rotating mechanism, the fuel rod lifting mechanism clamps the fuel rod, the fuel rod clamping and rotating mechanism releases the fuel rod, the fuel rod lifting mechanism drives the fuel rod to lift and move, and after moving to the next detection position, the fuel rod clamping and rotating mechanism works, clamps the fuel rod, and the fuel rod lifting mechanism releases the fuel rod; Sixth step: Turn on the X-ray tube and the detector again, turn on the fuel rod clamping and rotating mechanism to select to work, and rotate the second position of the fuel rod workpiece for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives; Seventh step: Repeat the operations in the third to sixth steps until the detection of this fuel rod is completed, turn off the radiation source and the detector, release the fuel rod clamping and rotating mechanism, and the special conveying manipulator takes away the slender fuel rod.

9. The vertical X-ray CT inspection device for post-burning fuel rods with a channel type and two working positions according to claim 1, characterized in that: A channel-type double-station post-burn fuel rod vertical X-ray CT detection device, and the detection method for post-burn nuclear fuel special-shaped parts: First step: The X-ray tube lifting and moving mechanism is adjusted and positioned. Select the X-ray tube according to the specifications of the workpiece to be detected, and choose a 450KV X-ray tube or a 225KV micro-focus X-ray tube, and move to the initial detection position; Second step: The detector lifting and moving mechanism is adjusted and positioned. Select the detector according to the specifications of the workpiece to be detected, and choose an area array detector or a linear array detector as the detection detector, and move to the initial position corresponding to the X-ray tube; Third step: The special conveying manipulator places the post-burn nuclear fuel special-shaped part on the high-precision turntable B of the post-burn nuclear fuel special-shaped part CT detection platform; Fourth step: Turn on the X-ray tube and the detector, turn on the post-burn nuclear fuel special-shaped part CT detection platform to work, and rotate the post-burn nuclear fuel special-shaped part for CT detection imaging. The workbench at the far end on the ground performs real-time image analysis and processing and archives; Fifth step: After the detection of the post-burn nuclear fuel special-shaped part is completed, turn off the radiation source and the detector, stop the post-burn nuclear fuel special-shaped part CT detection platform, and the special conveying manipulator takes away the post-burn nuclear fuel special-shaped part.

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