A device for fuel assembly dimensional measurement and visual inspection

Abstract

The application discloses a device for fuel assembly size measurement and appearance inspection, which comprises a main frame, a transmission system, a two-dimensional coordinate measurement unit, a height measurement unit, a clamping unit and a control box, the main frame is vertically arranged, the clamping unit is fixedly connected with the lower end of the main frame, and the clamping unit is used for clamping a fuel assembly to be measured, and the control ends of the transmission system, the two-dimensional coordinate measurement unit, the height measurement unit and the clamping unit are electrically connected with the control box.

Description

Technical Field

[0001] This invention relates to the field of nuclear engineering equipment, and more specifically to a device for measuring the size and visual inspection of fuel assemblies. Background Technology

[0002] When new materials or structures are used in fuel assembly design, the fuel assembly needs to undergo irradiation testing and post-irradiation poolside inspection to ensure it meets design requirements. Existing poolside inspection methods primarily involve visual inspection using underwater cameras and contact-based dimensional measurements using LVDT probes or eddy current probes. Contact-based measurements pose a risk of scratching the oxide film on the fuel assembly surface; therefore, a device capable of rapidly performing visual inspection and dimensional measurement of fuel assemblies is needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the current appearance inspection may scratch the surface of the fuel assembly and requires repeated appearance inspection. The purpose is to provide a device for measuring the size of the fuel assembly and inspecting its appearance, so as to complete the size measurement of the fuel assembly and the appearance inspection of multiple surfaces without changing the equipment.

[0004] This invention is achieved through the following technical solution:

[0005] A device for measuring the dimensions and inspecting the appearance of fuel assemblies includes: a main frame, a transmission system, a two-dimensional coordinate measuring unit, a height measuring unit, a clamping unit, and a control box. The main frame is vertically arranged, and the clamping unit is fixedly connected to the lower end of the main frame and is used to clamp the fuel assembly to be measured. The control terminals of the transmission system, the two-dimensional coordinate measuring unit, the height measuring unit, and the clamping unit are all electrically connected to the control box.

[0006] The transmission system includes a drive assembly and a mounting platform. The mounting platform is located above the clamping unit and is slidably connected to the main frame. The drive assembly drives the mounting platform to move up and down along the main frame. The two-dimensional coordinate measuring unit is fixedly connected to the mounting platform, and the height measuring unit is fixedly connected to the mounting platform.

[0007] Optionally, the main frame includes: a top plate, two side plates, a back plate, a front plate, and a bottom plate in the form of a cuboid box structure, and the drive assembly and the control box are both fixedly installed above the top plate;

[0008] A hoisting frame for lifting is also connected above the top plate.

[0009] Specifically, the driving component includes:

[0010] A linear guide rail is vertically mounted on the front panel, and the mounting platform is slidably connected to the linear guide rail;

[0011] A first drive motor is fixedly mounted on the top plate via a first sealed housing. A drive sprocket, a guide sprocket, and a driven sprocket are connected to the first sealed housing. The torque output shaft of the first drive motor is poweredly connected to the drive sprocket.

[0012] A counterweight is disposed within the main frame and slides up and down along the main frame;

[0013] A chain, one end of which is fixedly connected to the mounting platform, and the other end of which is fixedly connected to the counterweight, and the chain meshes with the drive sprocket, the guide sprocket and the driven sprocket.

[0014] Specifically, the platform includes:

[0015] A guide rail slider is slidably connected to the linear guide rail and can slide up and down along the linear guide rail;

[0016] A platform guide plate is vertically arranged and is fixedly connected to the guide rail slider.

[0017] The platform plate is horizontally positioned and is fixedly connected to the platform guide plate via a platform support plate. The two-dimensional coordinate measuring unit is fixedly mounted on the platform plate.

[0018] Optionally, the number of the two-dimensional coordinate measuring units is multiple, and the mounting platform is provided with a through hole for the fuel assembly to be measured to pass through. The multiple two-dimensional coordinate measuring units are arranged in a ring around the through hole, and the two-dimensional coordinate measuring units include:

[0019] The second sealed enclosure is equipped with a first watertight plug for communicating with internal components and a lighting lamp for illumination.

[0020] Optical glass, a measuring hole is provided on the side of the second sealed box, and the optical glass is connected to the second sealed box by a glass pressure plate and the measuring hole is sealed;

[0021] The second sealed enclosure is equipped with a camera for observation, a laser emitter for laser detection, and a laser receiver. The laser emitter emits laser light through the optical glass, and the laser light is reflected by the fuel assembly and received by the laser receiver.

[0022] Specifically, the height measuring unit includes:

[0023] The third sealing chamber is connected to the mounting base by an angle adjustment bolt. The mounting base is fixedly connected to the mounting platform. The third sealing chamber is equipped with an inflation valve for filling with sealing gas and a second watertight plug for communicating with internal components.

[0024] A friction wheel is rotatably connected to the third sealing box via a rotating shaft. A friction rubber ring is connected to the circumferential surface of the friction wheel, and the circumferential surface of the friction wheel rolls up and down along the side plate.

[0025] An angle encoder is disposed within the third sealed housing, and the torque input end of the angle encoder is fixedly connected to the rotating shaft.

[0026] Optionally, the third sealed housing is provided with a lead shielding plate for protecting the angle encoder, and a protective plate for protecting the friction wheel is connected to the outside of the third sealed housing.

[0027] Optionally, the clamping unit includes:

[0028] A support frame, which is fixedly connected to the lower end of the main frame;

[0029] A fixed V-block is fixedly mounted on the upper surface of the support frame by a sensor fixing block, and a force sensor is provided between the sensor fixing block and the fixed V-block;

[0030] A movable V-block is disposed opposite to the fixed V-block. The movable V-block is slidably connected to the support frame through a slider base, and the opposing surfaces of the movable V-block and the fixed V-block are provided with V-shaped grooves for clamping fuel assemblies.

[0031] A drive assembly, which is fixedly connected to the support frame, is used to drive the movable V-block to move toward the fixed V-block.

[0032] Optionally, the driving component includes:

[0033] A lead screw shaft, wherein the axis is parallel to the line connecting the movable V-block and the fixed V-block, the movable V-block is provided with a threaded hole adapted to the lead screw shaft, and the first end of the lead screw shaft is connected to the movable V-block through the threaded hole;

[0034] A driven bevel gear, wherein the axis of the driven bevel gear coincides with the lead screw shaft, and the driven bevel gear is fixedly connected to the second end of the lead screw shaft;

[0035] The second drive motor is housed in the fourth sealed housing, and the torque output shaft of the second drive motor meshes with the passive bevel gear through the active bevel gear.

[0036] Furthermore, the driving component also includes:

[0037] A manual bevel gear is horizontally positioned and meshes with the passive bevel gear. The manual bevel gear is connected to the support frame, and a manual rotation slot is provided on the shaft of the manual bevel gear.

[0038] A guide flare is provided above the manual bevel gear, and the small diameter end of the guide flare corresponds to the manual rotation bayonet.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] This invention uses a clamping unit to fix the fuel assembly and a transmission system to drive the two-dimensional coordinate measuring unit and the height measuring unit to move up and down, thereby realizing the appearance inspection and dimensional measurement of the fuel assembly.

[0041] This invention also enables the visual inspection of multiple surfaces of the fuel assembly without changing equipment or transferring the fuel assembly a second time by setting up multiple two-dimensional coordinate measurement units around the fuel assembly. Attached Figure Description

[0042] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, but do not constitute a limitation on the embodiments of the present invention.

[0043] Figure 1 This is a schematic diagram of a device for measuring the size and visual inspection of fuel assemblies according to the present invention.

[0044] Figure 2 This is a schematic diagram of the transmission system according to the present invention.

[0045] Figure 3 This is a schematic diagram of the structure of the two-dimensional coordinate measurement unit according to the present invention.

[0046] Figure 4 This is a schematic diagram of the height measuring unit according to the present invention.

[0047] Figure 5 This is a schematic diagram of the clamping unit according to the present invention.

[0048] Reference numerals: 1. Control box; 2. Transmission system; 3. Two-dimensional coordinate measurement unit; 4. Height measurement unit; 5. Clamping unit; 6. Fuel assembly.

[0049] First sealed housing 201, drive sprocket 202, guide sprocket 203, driven sprocket 204, top plate 205, first drive motor 206, side plate 207, front plate 208, counterweight 210, chain 211, bottom plate 212, cable chain 213, linear guide rail 214, platform guide plate 215, platform support plate 216, guide rail slider 217, platform plate 218, hanger 219.

[0050] First watertight plug 301, second sealed housing 302, optical glass 303, glass pressure plate 304, bottom mounting plate 305, lighting lamp 306.

[0051] Second watertight plug 401, friction rubber ring 402, friction wheel 403, angle encoder 405, lead shielding plate 406, protection plate 407, first inflation valve 408, third sealing housing 409, mounting base 410, angle adjustment bolt 411.

[0052] Guide bell 501, manual bevel gear 502, passive bevel gear 503, active bevel gear 504, second drive motor 505, second inflation valve 506, fourth sealing box 507, cable inlet sealing component 508, support frame 509, cable outlet sealing component 510, fifth sealing box 511, power supply 512, sensor fixing block 513, fixed V-block 514, movable V-block 515, slider base 516, force sensor 517. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0054] It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0055] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] Where there is no conflict, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0058] Example 1

[0059] like Figure 1 As shown, this embodiment provides a device for measuring the dimensions and inspecting the appearance of a fuel assembly 6, including: a main frame, a transmission system 2, a two-dimensional coordinate measuring unit 3, a height measuring unit 4, a clamping unit 5, and a control box 1. The main frame is vertically arranged, and the clamping unit 5 is fixedly connected to the lower end of the main frame. The clamping unit 5 is used to clamp the fuel assembly 6 to be measured. The control terminals of the transmission system 2, the two-dimensional coordinate measuring unit 3, the height measuring unit 4, and the clamping unit 5 are all electrically connected to the control box 1. The various devices are connected at points through cable chains 213, and cable chains are provided on both sides, marked as 211 and 213 in the figure.

[0060] The enclosure is a sealed metal PLC box, with control unit components inside and a watertight plug on the outside, allowing for quick cable connection.

[0061] The main frame includes a top plate 205, two side plates 207, a back plate, a front plate 208, and a bottom plate 212, which are rectangular box structures. The drive assembly and control box 1 are fixedly installed above the top plate 205. A hoisting frame 219 for hoisting is also connected above the top plate 205.

[0062] The main frame supports the entire device and houses the various components, while the top hanger 219 allows the device to be submerged in water. In practice, the top plate 205, side plates 207, back plate, front plate 208, and bottom plate 212 are all designed with openwork structures to reduce weight.

[0063] Example 2

[0064] like Figure 1 and Figure 2As shown, the transmission system 2 in this embodiment includes a drive component and a mounting platform. The mounting platform is located above the clamping unit 5 and is slidably connected to the main frame. The drive component drives the mounting platform to move up and down along the main frame. The two-dimensional coordinate measuring unit 3 is fixedly connected to the mounting platform, and the height measuring unit 4 is fixedly connected to the mounting platform.

[0065] The drive assembly includes: a linear guide rail 214, a first drive motor 206, a counterweight 210, and a chain 211.

[0066] A linear guide rail 214 is vertically mounted on the front plate 208, and the mounting platform is slidably connected to the linear guide rail 214. A counterweight 210 is mounted within the main frame and slides up and down along the main frame. One end of a chain 211 is fixedly connected to the mounting platform, and the other end of the chain 211 is fixedly connected to the counterweight 210. By connecting the mounting platform and the counterweight 210 via the chain 211, the up and down movement of the mounting platform can be controlled by driving the chain 211 via the first drive motor 206.

[0067] Therefore, the first drive motor 206 is fixedly mounted on the top plate 205 via the first sealed housing 201. The first sealed housing 201 is connected to the drive sprocket 202, the guide sprocket 203 and the driven sprocket 204. The torque output shaft of the first drive motor 206 is poweredly connected to the drive sprocket 202. The chain 211 meshes with the drive sprocket 202, the guide sprocket 203 and the driven sprocket 204.

[0068] The mounting platform includes: guide rail slider 217, platform guide plate 215 and platform plate 218.

[0069] The guide rail slider 217 is slidably connected to the linear guide rail 214 and can slide up and down along the linear guide rail 214; the movement of the mounting platform is limited by the cooperation of the guide rail slider 217 and the linear guide rail 214.

[0070] The platform guide plate 215 is vertically set and is fixedly connected to the guide rail slider 217; the platform plate 218 is horizontally set and is fixedly connected to the platform guide plate 215 through the platform support plate 216; the two-dimensional coordinate measuring unit 3 is fixedly set on the platform plate 218; and the platform is provided with a through hole for the fuel assembly 6 to be measured to pass through.

[0071] like Figure 1 As shown, there are multiple two-dimensional coordinate measuring units 3, and these multiple two-dimensional coordinate measuring units 3 are arranged in a ring around the through hole. By designing multiple two-dimensional coordinate measuring units 3 and surrounding the fuel assembly 6 with these multiple two-dimensional coordinate measuring units 3, multiple angles can be measured in one movement of the mounting platform.

[0072] like Figure 3As shown, the two-dimensional coordinate measurement unit 3 includes: a second sealed housing 302, an optical glass 303, and electronic components for optical measurement.

[0073] The second sealed enclosure 302 is provided with a first watertight plug 301 for communicating with internal components, and a lighting lamp 306 for illumination; the second sealed enclosure 302 is connected to the base plate 212 through a bottom mounting plate 305.

[0074] The side of the second sealed enclosure 302 is provided with a measuring hole. The optical glass 303 is connected to the second sealed enclosure 302 through the glass pressure plate 304 and seals the measuring hole. Inside the second sealed enclosure 302, there is a camera for observation, a laser emitter for laser detection and a laser receiver. The laser emitter emits laser through the optical glass 303, and the laser is reflected by the fuel assembly 6 and received by the laser receiver.

[0075] The control system selects to start dimensional measurement, the lighting 306 is turned off, the first drive motor 206 starts to rotate, driving the drive sprocket 202 to rotate, which in turn drives the chain 211 to move. The guide sprocket 203 and the passive sprocket 204 start to rotate under the action of the chain 211. The counterweight 210 starts to descend under the action of gravity. The platform is pulled by the chain 211, causing the platform to rise along the linear guide rail 214. During the ascent, multiple two-dimensional coordinate measuring units 3 scan the surface of the fuel assembly 6 with lasers throughout the process.

[0076] After the coordinate measurement is completed, an appearance inspection is carried out. The lighting 306 is turned on, and the platform is pulled by the chain 211 to rise along the linear guide rail 214. During the rise, multiple two-dimensional coordinate measurement units 3 turn off the laser emitter, observe the surface of the fuel assembly 6 through the camera in the measurement unit, and transmit the data to the computer.

[0077] Example 3

[0078] like Figure 4 As shown, the height measuring unit 4 includes: a third sealed housing 409, a friction wheel 403, and an angle encoder 405.

[0079] The third sealing housing 409 is connected to the mounting base 410 via an angle adjustment bolt 411. The mounting base 410 is fixedly connected to the mounting platform. The third sealing housing 409 is equipped with an inflation valve for filling with sealing gas and a second watertight plug 401 for communicating with internal components. The angle of the friction wheel 403 can be adjusted via the angle adjustment bolt 411 so that the friction wheel 403 can fit tightly against the front plate 208.

[0080] Friction wheel 403 is rotatably connected to third sealing housing 409 via a rotating shaft. Friction rubber ring 402 is connected to the circumferential surface of friction wheel 403. The circumferential surface of friction wheel 403 rolls up and down along side plate 207. Angle encoder 405 is installed inside third sealing housing 409, and the torque input end of angle encoder 405 is fixedly connected to rotating shaft.

[0081] When the platform moves up and down, the friction wheel 403 rotates synchronously, and the rotation angle of the friction wheel 403 is obtained by the angle encoder 405. Then, the height of the fuel assembly 6 can be obtained by the circumference of the friction wheel 403.

[0082] To prevent radiation from interfering with the angle encoder 405, a lead shielding plate 406 for protecting the angle encoder 405 is installed inside the third sealed housing 409, and a protective plate 407 for protecting the friction wheel 403 is connected to the outside of the third sealed housing 409.

[0083] During the ascent, the friction rubber ring 402 in the height measurement unit 4 rolls against the side plate 207, thereby driving the rotating shaft of the angle encoder 405 to rotate. The control box 1 transmits the angle data obtained by the angle encoder 405 and the two-dimensional coordinate point data of the fuel assembly 6 surface obtained by the two-dimensional coordinate measurement unit 3 to the computer. The computer multiplies the angle encoder 405 data by the radius of the friction rubber ring 402 to obtain the height data, and then compares them to obtain the three-dimensional coordinate point data of the fuel assembly 6 surface.

[0084] Example 4

[0085] The clamping unit 5 includes: a support frame 509, a fixed V-block 514, and a movable V-block 515. The support frame 509 is fixedly connected to the lower end of the main frame.

[0086] The fixed V-block 514 is fixedly mounted on the upper surface of the support frame 509 via the sensor fixing block 513, and a force sensor 517 is provided between the sensor fixing block 513 and the fixed V-block 514; the movable V-block 515 is arranged opposite to the fixed V-block 514, and the movable V-block 515 is slidably connected to the support frame 509 via the slider base 516, and the opposite surfaces of the movable V-block 515 and the fixed V-block 514 are provided with V-shaped grooves for clamping the fuel assembly 6; the drive assembly is fixedly connected to the support frame 509 and is used to drive the movable V-block 515 to move toward the fixed V-block 514.

[0087] When it is necessary to clamp the fuel assembly 6, the movement of the movable V-block 515 is controlled by the drive component. The bottom of the fuel assembly 6 is clamped by the movable V-block 515 and the fixed V-block 514. In order to avoid damage to the fuel assembly 6 due to excessive force, the clamping force is detected by the force sensor 517.

[0088] The drive assembly includes: a lead screw shaft, a driven bevel gear 503, and a second drive motor 505.

[0089] The central axis of the lead screw shaft is parallel to the line connecting the movable V-block 515 and the fixed V-block 514. The movable V-block 515 is provided with a threaded hole that matches the lead screw shaft. The first end of the lead screw shaft is connected to the movable V-block 515 through the threaded hole, thus forming a threaded lead screw structure that converts rotary motion into linear motion.

[0090] The central axis of the passive bevel gear 503 coincides with the lead screw shaft, and the passive bevel gear 503 is fixedly connected to the second end of the lead screw shaft; the second drive motor 505 is installed inside the fourth sealed housing 507, and the torque output shaft of the second drive motor 505 meshes with the passive bevel gear 503 through the active bevel gear 504.

[0091] Select the size measurement mode, use a special tool to grab the fuel assembly 6 and transfer it above the clamping unit 5, then insert it into the movable V-block 515 and the fixed V-block 514. The second drive motor 505 rotates, driving the active bevel gear 504 to rotate, which in turn drives the passive bevel gear 503 and the lead screw to rotate, thereby causing the movable V-block to slide on the slider base 516, so that the lower end of the fuel assembly 6 is clamped by the movable V-block and the fixed V-block 514. During the movement of the movable V-block, the lower end of the fuel assembly 6 slowly contacts the force sensor 517. When the force sensor 517 reaches the set value, the force sensor 517 signal is transmitted to the control system, and the second drive motor 505 stops rotating.

[0092] To prevent the clamping assembly from failing to release due to a malfunction of the second drive motor 505, the drive assembly also includes: a manual bevel gear 502 and a guide bell 501.

[0093] The manual bevel gear 502 is horizontally positioned and meshes with the driven bevel gear 503. The manual bevel gear 502 is connected to the support frame 509, and a manual rotation slot is provided on the rotating shaft of the manual bevel gear 502. The guide flare 501 is positioned above the manual bevel gear 502, and the small diameter end of the guide flare 501 is correspondingly positioned with the manual rotation slot.

[0094] When the second drive motor 505 malfunctions, the rotating rod can be drawn into the water and aligned with the manual bevel gear 502 through the guide horn 501. The movement of the movable V-block 515 can be controlled by manually rotating the manual bevel gear 502.

[0095] If the equipment malfunctions during the measurement process, first use the fuel assembly 6 gripping tool to firmly grip the upper end of the fuel assembly 6. Then, use a special long-handled tool to insert into the guide horn 501 and connect the lower end of the tool to the manual bevel gear 502. Rotate the special long-handled tool in the opposite direction, and the manual bevel gear 502 will drive the passive bevel gear 503 and the lead screw shaft to rotate, thereby causing the moving V-block to slide backward on the slider base 516, so that the lower end of the fuel assembly 6 is released from the moving V-block and the fixed V-block 514. After being released, transfer the fuel assembly 6 to a safe area and lift the device out of the water for inspection.

[0096] In addition, the drive assembly is also equipped with a power supply 512, which is fixed to the support frame 509 through the fifth sealed housing 211. The fifth sealed housing 211 is equipped with a cable outlet sealing component 510 for leading out cables, and the fourth sealed housing 507 is equipped with a cable inlet sealing component 508 for leading in cables. Power supply and control are achieved by leading in and out cables.

[0097] Example 5

[0098] This embodiment provides a method for dimensional measurement and appearance inspection.

[0099] S1. Place the fuel assembly 6 into position on the clamping unit 5 and clamp it securely.

[0100] S2. Turn off the lights 306 to maintain a dark underwater environment.

[0101] S3. After the measurement begins, the transmission system 2 drives the platform to rise. During the rise, the laser emitters in multiple two-dimensional coordinate measurement units 3 emit horizontal line lasers. After the line lasers irradiate the surface of the fuel assembly 6, they are reflected to the laser receivers in the corresponding two-dimensional coordinate measurement units 3. The control box 1 feeds back the obtained image data to the computer to obtain the two-dimensional coordinate points layer by layer.

[0102] S4. During the measurement process, the friction wheel 403 in the height measurement unit 4 rolls against the side plate 207, which in turn drives the rotating shaft inside the angle encoder 405 to rotate. The data is transmitted to the computer through the control box 1. The computer merges the data obtained in S3 to obtain the three-dimensional point coordinates on the surface of the fuel assembly 6.

[0103] S5. After completing the dimensional measurement, the transmission system 2 will reset the platform to its lowest point.

[0104] S6. Turn on the lighting 306. The transmission system 2 drives the measurement platform to rise. During the rise, the laser emitter in the two-dimensional coordinate measurement unit 3 is turned off, and the camera in the two-dimensional coordinate measurement unit 3 begins to observe the fuel assembly 6.

[0105] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above invention, and these changes or modifications still fall within the scope of the present invention.

Claims

1. An apparatus for measuring the dimensions and visually inspecting fuel assemblies, characterized in that, include: The main frame consists of a transmission system (2), a two-dimensional coordinate measuring unit (3), a height measuring unit (4), a clamping unit (5), and a control box (1). The main frame is vertically arranged, and the clamping unit (5) is fixedly connected to the lower end of the main frame. The clamping unit (5) is used to clamp the fuel assembly (6) to be measured. The control terminals of the transmission system (2), the two-dimensional coordinate measuring unit (3), the height measuring unit (4), and the clamping unit (5) are all electrically connected to the control box (1). The transmission system (2) includes a drive component and a mounting platform. The mounting platform is located above the clamping unit (5) and is slidably connected to the main frame. The drive component drives the mounting platform to move up and down along the main frame. The two-dimensional coordinate measuring unit (3) is fixedly connected to the mounting platform. The height measuring unit (4) is fixedly connected to the mounting platform. The two-dimensional coordinate measuring unit (3) is multiplied, and the mounting platform is provided with a through hole for the fuel assembly (6) to be measured to pass through. The multiple two-dimensional coordinate measuring units (3) are arranged in a ring around the through hole. The two-dimensional coordinate measuring unit (3) includes: The second sealed enclosure (302) is provided with a first watertight plug (301) for communicating with internal components and a lighting lamp (306) for illumination. An optical glass (303) is provided on the side of the second sealed housing (302), and the optical glass (303) is connected to the second sealed housing (302) by a glass pressure plate (304) and the measuring hole is sealed. The second sealed enclosure (302) is equipped with a camera for observation, a laser emitter for laser detection and a laser receiver. The laser emitter emits laser light through the optical glass (303), and the laser light is reflected by the fuel assembly (6) and received by the laser receiver. The height measuring unit (4) includes: The third sealing housing (409) and the angle encoder (405) are connected to the mounting base (410) by an angle adjusting bolt (411), and the angle encoder (405) is disposed inside the third sealing housing (409). The mounting base (410) is fixedly connected to the mounting platform, and the third sealing box (409) is provided with an inflation valve for filling with sealing gas and a second watertight plug (401) for communicating with internal components; the third sealing box (409) is provided with a lead shield plate (406) for protecting the angle encoder (405), and the outside of the third sealing box (409) is connected with a protective plate (407) for protecting the friction wheel (403). The friction wheel (403) is rotatably connected to the third sealed housing (409) via a rotating shaft, and the torque input end of the angle encoder (405) is fixedly connected to the rotating shaft. The circumferential surface of the friction wheel (403) is connected to a friction rubber ring (402), and the circumferential surface of the friction wheel (403) rolls up and down along the side plate (207) of the main frame.

2. The apparatus for measuring the size and appearance of fuel assemblies according to claim 1, characterized in that, The main frame includes: a top plate (205) with a rectangular box structure, two side plates (207), a back plate, a front plate (208) and a bottom plate (212), and the drive assembly and the control box (1) are both fixedly installed above the top plate (205); A hoisting frame (219) for hoisting is also connected above the top plate (205).

3. The apparatus for measuring the size and visual inspection of fuel assemblies according to claim 2, characterized in that, The driving component includes: A linear guide rail (214) is vertically mounted on the front plate (208), and the mounting platform is slidably connected to the linear guide rail (214); The first drive motor (206) is fixedly mounted on the top plate (205) through the first sealed housing (201). The first sealed housing (201) is connected to a drive sprocket (202), a guide sprocket (203) and a driven sprocket (204). The torque output shaft of the first drive motor (206) is poweredly connected to the drive sprocket (202). A counterweight (210) is disposed within the main frame and slides up and down along the main frame; The chain (211) has one end fixedly connected to the mounting platform and the other end fixedly connected to the counterweight (210). The chain (211) meshes with the drive sprocket (202), the guide sprocket (203) and the passive sprocket (204).

4. The apparatus for measuring the size and visual inspection of fuel assemblies according to claim 3, characterized in that, The platform includes: The guide rail slider (217) is slidably connected to the linear guide rail (214) and can slide up and down along the linear guide rail (214); The platform guide plate (215) is vertically arranged and is fixedly connected to the guide rail slider (217); The platform plate (218) is horizontally set and is fixedly connected to the platform guide plate (215) through the platform support plate (216). The two-dimensional coordinate measuring unit (3) is fixedly set on the platform plate (218).

5. The apparatus for measuring the size and visual inspection of fuel assemblies according to claim 1, characterized in that, The clamping unit (5) includes: A support frame (509) is fixedly connected to the lower end of the main frame; A fixed V-block (514) is fixedly mounted on the upper surface of the support frame (509) by a sensor fixing block (513), and a force sensor (517) is provided between the sensor fixing block (513) and the fixed V-block (514). A movable V-block (515) is disposed opposite to the fixed V-block (514). The movable V-block (515) is slidably connected to the support frame (509) through a slider base (516). The opposing surfaces of the movable V-block (515) and the fixed V-block (514) are provided with V-shaped grooves for clamping the fuel assembly (6). A drive assembly, which is fixedly connected to the support frame (509) and is used to drive the movable V-block (515) to move toward the fixed V-block (514).

6. The apparatus for measuring the size and visual inspection of fuel assemblies according to claim 5, characterized in that, The driving component includes: A lead screw shaft, wherein the axis is parallel to the line connecting the movable V-block (515) and the fixed V-block (514), the movable V-block (515) is provided with a threaded hole adapted to the lead screw shaft, and the first end of the lead screw shaft is connected to the movable V-block (515) through the threaded hole. A passive bevel gear (503) has its axis coincident with the lead screw shaft, and the passive bevel gear (503) is fixedly connected to the second end of the lead screw shaft; The second drive motor (505) is disposed inside the fourth sealed housing (507), and the torque output shaft of the second drive motor (505) meshes with the passive bevel gear (503) through the active bevel gear (504).

7. The apparatus for measuring the size and visual inspection of fuel assemblies according to claim 6, characterized in that, The driving component also includes: A manual bevel gear (502) is horizontally arranged and meshes with the passive bevel gear (503). The manual bevel gear (502) is connected to the support frame (509), and a manual rotation slot is provided on the shaft of the manual bevel gear (502). A guide horn (501) is disposed above the manual bevel gear (502), and the small diameter end of the guide horn (501) is correspondingly disposed with the manual rotation bayonet.

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