Underwater detection device for fuel assembly

Abstract

The utility model relates to an underwater detection device for a fuel assembly. The underwater detection device comprises a lifting mechanism and a camera. The lifting mechanism comprises a telescopic assembly and a driving assembly, the telescopic assembly is provided with a first end used for stretching into water, the camera is installed at the first end and used for shooting images of the underwater fuel assembly, and the driving assembly is connected with the telescopic assembly and used for driving the telescopic assembly to stretch out and draw back so as to drive the camera to ascend and descend. In the detection process of the fuel assembly, the fuel assembly is kept fixed, the driving assembly drives the telescopic assembly to stretch out and draw back, the telescopic assembly drives the camera to ascend and descend, ascending and descending of the fuel assembly are reduced, risks caused by frequent ascending and descending of the fuel assembly can be reduced, and safety of the fuel assembly is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear fuel underwater visual inspection, in particular to a fuel assembly underwater inspection device. BACKGROUND

[0002] During the overhaul of the reactor core and the discharge of the nuclear power plant, the fuel assembly needs to be visually inspected to confirm whether there are foreign matters on the outside of the fuel assembly, whether there are abnormalities on the upper and lower nozzles, and whether the fuel assembly is complete.

[0003] Generally, a camera is fixed in a water pool containing the fuel assembly. When detecting, the fuel assembly is hoisted to a visual inspection position, and the image of the fuel assembly is captured by the camera to visually inspect the fuel assembly. If the fuel assembly needs to be detected in all aspects, the fuel assembly needs to be moved up and down. However, frequent up and down movement of the fuel assembly poses a safety risk. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a fuel assembly underwater inspection device to ensure safety while visually inspecting.

[0005] A fuel assembly underwater inspection device includes a lifting mechanism and a camera, the lifting mechanism includes a telescopic assembly and a driving assembly, the telescopic assembly has a first end for extending underwater, the camera is installed on the first end, the camera is used to capture the image of the fuel assembly underwater, and the driving assembly is connected with the telescopic assembly, and the driving assembly is used to drive the telescopic assembly to extend and retract to drive the camera to lift.

[0006] In one embodiment, the telescopic assembly includes at least two telescopic sleeves, one of the telescopic sleeves is connected with the driving assembly, one of the telescopic sleeves is connected with the camera, and adjacent two telescopic sleeves are nested and can move relative to each other.

[0007] In one embodiment, each telescopic sleeve is provided with a water flow hole, and the water flow hole is in communication with the lumen of the telescopic sleeve.

[0008] In one embodiment, the fuel assembly underwater inspection device further includes an adapter and a mounting bracket, one end of the adapter is arranged in the telescopic sleeve at the first end, the mounting bracket is mounted on the end of the adapter away from the telescopic sleeve, and the camera is mounted on the mounting bracket.

[0009] In one embodiment, the adapter is provided with a drainage groove, and the drainage groove is in communication with the water flow hole.

[0010] In one of the embodiments, the telescopic assembly further has a second end opposite to the first end; the driving assembly comprises a mounting frame, a driving member, a winding drum and a steel wire rope, the driving member is mounted on the mounting frame, a driving end of the driving member is connected with the winding drum, the steel wire rope is wound on the winding drum, one end of the steel wire rope away from the winding drum is connected with the telescopic assembly, and the driving member is used to drive the winding drum to rotate around its own axis to wind or unwind the steel wire rope.

[0011] In one of the embodiments, one end of the steel wire rope away from the telescopic assembly is wound on the winding drum, and the winding drum is provided with a rope pressing member extending along the axial direction of the winding drum and used to press one end of the steel wire rope away from the telescopic assembly on the winding drum.

[0012] In one of the embodiments, the fuel assembly underwater detection device further comprises a limit switch arranged on the telescopic sleeve at the second end, the limit switch is electrically connected with the driving assembly, and the other telescopic sleeve is provided with a triggering member, which cooperates with the limit switch to trigger the driving assembly to stop running when the telescopic assembly is contracted.

[0013] In one of the embodiments, the fuel assembly underwater detection device further comprises a limit sensor arranged on the second end, which is used to detect the number of turns of the steel wire rope on the winding drum when the telescopic assembly is elongated, and the driving member stops running when the number of turns of the steel wire rope is a preset number of turns; or the limit sensor is used to detect the number of rotation turns of the driving member, and the driving member stops running when the number of rotation turns is a preset number of turns.

[0014] In one of the embodiments, the camera comprises a seat body and a camera head, the seat body is rotatably mounted on the lifting mechanism, the seat body can rotate around a direction parallel to the lifting direction, and the camera head is rotatably mounted on the seat body, and the camera head can perform pitching motion relative to the seat body around a direction intersecting with the lifting direction.

[0015] The fuel assembly underwater detection device described above can reduce the risk caused by frequent lifting of the fuel assembly and ensure the safety of the fuel assembly during the detection of the fuel assembly, because the fuel assembly remains stationary, the telescopic assembly is driven by the driving assembly to perform telescopic movement, and the camera is driven by the telescopic assembly to perform lifting. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic view of a fuel assembly underwater detection device in an elongated state according to an embodiment of the present application.

[0017] Figure 2 As shown in Fig. 1, the fuel assembly underwater detection device is in the contracted state. Figure 1 As shown in Fig. 1, the fuel assembly underwater detection device is in the contracted state.

[0018] Figure 3 As shown in Fig. 1, the fuel assembly underwater detection device is in the contracted state.

[0019] Figure 4 As shown in Fig. 1, the fuel assembly underwater detection device is in the contracted state.

[0020] Figure 5 As shown in Fig. 1, the fuel assembly underwater detection device is in the contracted state.

[0021] Figure 6 As shown in Fig. 1, the fuel assembly underwater detection device is in the contracted state.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 10, lifting mechanism; 11, telescopic assembly; 111, telescopic sleeve; 1111, water flow hole; 112, first end; 113, second end; 12, driving assembly; 121, driving member; 1211, first transmission gear; 122, winding drum; 1221, second transmission gear; 1222, spiral rope groove; 30, adapter; 40, mounting rack; 50, fixing rack; 60, limit switch. DETAILED DESCRIPTION

[0024] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways other than those described herein without departing from the spirit of the present application, and it will be apparent to those skilled in the art that similar modifications of structure and method that are within the scope of the present application can be made without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0025] Referring to Figure 1 The fuel assembly underwater detection device provided by an embodiment of the present application includes a lifting mechanism 10 and a camera. The lifting mechanism 10 has a first end 112, which is used to extend into water. The camera is mounted on the first end 112 and can be lifted and lowered under the driving of the lifting mechanism 10 to take images of the fuel assembly underwater.

[0026] Optionally, the lifting mechanism 10 is fixed to the side wall of a pool containing the fuel assembly, which facilitates the movement of the fuel assembly underwater detection device and the maintenance of the fuel assembly underwater detection device.

[0027] When the fuel assembly is detected by the fuel assembly underwater detection device, the fuel assembly is hoisted to the detection position and then kept fixed. Then, the lifting mechanism 10 drives the camera to move up and down so that the camera moves to the required detection position of the fuel assembly, for example, the camera moves to the position of the grid strip, the upper tube support and the lower tube support of the fuel assembly, and the camera takes pictures of the corresponding position of the fuel assembly. The pictures can be analyzed to determine whether the fuel assembly has any appearance defects.

[0028] When the defective fuel assembly is detected by the fuel assembly underwater detection device before being repaired, the defective fuel assembly is hoisted to the detection position and then kept fixed. Then, the lifting mechanism 10 drives the camera to move up and down to detect the fuel rod from multiple angles, which provides a basis for evaluating the damage of the fuel rod.

[0029] In this way, during the detection of the fuel assembly, the fuel assembly is kept fixed, the lifting mechanism 10 drives the camera to move up and down, and the lifting of the fuel assembly is reduced, which can reduce the risk caused by the frequent lifting of the fuel assembly and ensure the safety of the fuel assembly. In addition, since the lifting mechanism 10 can drive the camera to move up and down, the detection position of the camera can be increased, the fuel assembly can be detected from all directions, and the accuracy of the detection result can be improved.

[0030] In one embodiment, the lifting mechanism 10 includes a telescopic assembly 11 and a driving assembly 12. The telescopic assembly 11 has a first end 112, and the camera is installed at the first end 112 of the telescopic assembly 11. The driving assembly 12 is connected with the telescopic assembly 11, and the driving assembly 12 is used to drive the telescopic assembly 11 to telescope so as to drive the camera to move. In use, the driving assembly 12 drives the telescopic assembly 11 to telescope, and the camera moves with the telescopic assembly 11 to realize the lifting of the camera.

[0031] In one embodiment, referring to Figure 1 , the telescopic assembly 11 also has a second end 113, and the second end 113 is used to be arranged above the water surface. It can be understood that the first end 112 and the second end 113 are respectively two ends of the telescopic assembly 11 along the telescopic direction thereof.

[0032] Further, referring to Figure 1 and Figure 2 , the telescopic assembly 11 includes at least two telescopic sleeves 111. One of the telescopic sleeves 111 is connected with the driving assembly 12, and one of the telescopic sleeves 111 is connected with the camera. Adjacent two telescopic sleeves 111 are nested and can move relative to each other.

[0033] In the embodiment, the pipe diameter of the telescopic sleeve 111 gradually increases in the direction from the first end 112 to the second end 113. It can be understood that the pipe diameter of the telescopic sleeve 111 gradually increases in the direction from the first end 112 to the second end 113 in a plurality of steps. In this way, interference of the telescopic sleeve 111 during telescoping is avoided, and the telescopic assembly 11 can be smoothly telescoped.

[0034] Of course, in other embodiments, the pipe diameter of the telescopic sleeve 111 gradually decreases in the direction from the first end 112 to the second end 113.

[0035] Optionally, the telescopic sleeve 111 is made of hard aluminum-magnesium alloy, and the outer surface of the telescopic sleeve 111 is subjected to oxidation treatment.

[0036] In one embodiment, referring to Figure 3 and Figure 4 , the pipe wall of each telescopic sleeve 111 is provided with a water flow hole 1111, which is in communication with the lumen of the telescopic sleeve 111. When the telescopic assembly 11 is inserted underwater, water can flow into the telescopic sleeve 111 through the water flow hole 1111, so that the internal pressure and the external pressure of the telescopic sleeve 111 are balanced, thereby avoiding deformation of the telescopic sleeve 111.

[0037] In one embodiment, referring to Figure 1 and Figure 4 , the fuel assembly underwater detection device further comprises an adapter 30 and a mounting bracket 40. One end of the adapter 30 is arranged in the telescopic sleeve 111 at the first end 112, and the adapter 30 is fixedly connected with the first end 112 of the telescopic assembly 11, so as to reduce the possibility of misoperation. The mounting bracket 40 is mounted on the end of the adapter 30 away from the telescopic assembly 11, and the camera is mounted on the mounting bracket 40. In this way, the mounting bracket 40 is mounted on the first end 112 of the telescopic assembly 11 through the adapter 30, facilitating installation of the mounting bracket 40, and the mounting bracket 40 provides a mounting position for the camera, facilitating installation of the camera.

[0038] Optionally, the adapter 30 is a cylinder, and the mounting bracket 40 is a channel steel.

[0039] When the telescopic assembly 11 is inserted underwater, water will enter the telescopic sleeve 111 through the water flow hole 1111 and flow downward along the inner wall of the telescopic sleeve 111. Since the adapter 30 is arranged in the telescopic sleeve 111 at the first end 112, the adapter 30 will block the water from flowing out of the telescopic sleeve 111. Therefore, in the embodiment, the adapter 30 is provided with a drainage groove in communication with the water flow hole 1111, so that the water entering the telescopic sleeve 111 through the water flow hole 1111 can be drained through the drainage groove.

[0040] In one embodiment, the camera comprises a seat body and a camera head. The seat body is rotatably mounted on the lifting mechanism 10, in particular, the seat body is rotatably mounted on the mounting frame 40, and the seat body can rotate around a direction parallel to the lifting direction. The camera head is rotatably mounted on the seat body, and the camera head can perform pitching motion relative to the seat body around a direction intersecting the lifting direction. In use, the camera head can not only rotate around the lifting direction, but also perform pitching motion, so that the camera can be driven to rotate according to actual needs to take images of the fuel assembly in all directions, thereby improving the accuracy of the detection results.

[0041] Optionally, the camera is a special camera, and the model of the camera is SNK0100147 of Germany Wisag. The technical parameters and specifications of the camera of SNK0100147 of Germany Wisag are as follows: HDMI high-definition digital video output, imaging resolution up to 700 HTV lines; clear images or videos can be provided, with 60 times optical zoom capability, focusing range from 1.5 cm to infinity, with manual and automatic focusing functions; built-in temperature sensor, which can detect temperature changes inside and outside the lens, and can effectively protect the lens; with two sets of high-power LED lighting, one set of point light source and one set of flood light source, with a service life of up to 30,000 hours; with enhanced image noise reduction processing, high-resolution detection mode; capable of 347° axial rotation and 228° up-down flipping, which can meet the full-size coverage detection of the fuel assembly; 10-point position storage can be performed, which facilitates secondary inspection of defects and interesting working conditions.

[0042] Of course, in other embodiments, other models of cameras can also be used, without being limited thereto.

[0043] It should be noted that since the camera can rotate, for example, the camera can rotate 347° axially and flip 228° up and down, and the lifting mechanism 10 can drive the camera to lift, so that the damaged fuel rods inside the defective assembly above 7 layers can be checked from multiple angles and in all directions, and the image of the size of the fuel rod break is provided to provide a basis for evaluating the breakage of the damaged fuel rod, so as to ensure the safety of the repair operation.

[0044] In one embodiment, the fuel assembly underwater detection device further comprises a control device, which is in communication connection with the camera. The control device has a touch screen, buttons, etc., and through the operation of the buttons or the touch screen, the functions of rotating and shooting the camera head can be realized. In addition, the control device can also realize editing functions such as image zooming, intercepting and marking.

[0045] In one embodiment, referring to Figure 1 and Figure 5The driving assembly 12 comprises a mounting rack, a driving member 121, a winding drum 122 and a steel wire rope. The driving member 121 is mounted on the mounting rack, the driving end of the driving member 121 is connected with the winding drum 122, and the steel wire rope is wound on the winding drum 122. Optionally, the winding drum 122 is provided with a spiral rope groove 1222, and the steel wire rope is arranged in the spiral rope groove 1222. One end of the steel wire rope away from the winding drum 122 is connected with the telescopic assembly 1111. The driving member 121 is mounted on the second end 113 of the telescopic assembly 11, the driving member 121 is drivingly connected with the winding drum 122, and the driving member 121 is used to drive the winding drum 122 to rotate around its own axis to drive the steel wire rope to be wound or unwound. In use, the driving member 121 is started, the driving member 121 drives the winding drum 122 to rotate around its own axis, thereby driving the steel wire rope to be wound or unwound, and the steel wire rope drives the telescopic assembly 11 to be telescoped. Since the telescopic assembly 11 needs to be inserted into water, the driving member 121 is arranged at the second end 113 of the telescopic assembly 11, that is, the driving member 121 is arranged at the top of the telescopic assembly 11, so that water can be prevented from entering the driving member 121 to affect the service life of the driving member 121.

[0046] It should be noted that the connection mode of the steel wire rope and the telescopic sleeve 111 is a prior art, which will not be described here.

[0047] It should be noted that the winding drum 122 adopts a single-layer steel wire winding drum mode to improve the stability of the torque and the accuracy of the stroke calculation.

[0048] Further, the fuel assembly underwater detection device further comprises a first cable, and the first cable is electrically connected with the driving member 121. The first cable adopts an IP65 joint, so that the wiring and waterproof condition can be improved.

[0049] In one embodiment, referring to Figure 1 and Figure 6 The fuel assembly underwater detection device further comprises a fixing rack 50. The fixing rack 50 is mounted on the second end 113 of the telescopic assembly 11, and the driving member 121 and the winding drum 122 are both mounted on the fixing rack 50. In this way, the fixing rack 50 provides mounting positions for the driving member 121 and the winding drum 122, so that the installation of the driving member 121 and the winding drum 122 is facilitated.

[0050] Optionally, the fixing rack 50 is a fixed frame, the fixed frame is provided with a containing space, the winding drum 122 is arranged in the containing space, and opposite sides of the fixed frame provide mounting positions for the winding drum 122, so that the two ends of the winding drum 122 are respectively rotatably connected with the opposite sides of the fixed frame, so that the reliability of the installation of the winding drum 122 is improved. The driving member 121 is mounted on the side of the winding drum 122 away from the telescopic assembly 11, so that the driving member 121 is arranged on the top of the telescopic assembly 11, and water can be prevented from entering the driving member 121 to affect the service life of the driving member 121. Figure 1For example, the driving member 121 is installed above the winding drum 122, the output shaft of the driving member 121 is provided with a first transmission gear 1211, the winding drum 122 is provided with a second transmission gear 1221, and the first transmission gear 1211 is engaged with the second transmission gear 1221.

[0051] In one embodiment, the driving member 121 comprises a motor, and the output shaft of the motor is connected with an encoder. The rotation degree of the motor can be measured through the encoder. Moreover, the rotation speed of the winding drum 122 can be obtained through the rotation speed of the motor, and then the length of the steel wire rope being retracted or extended can be obtained, so as to obtain the length of the telescopic assembly 11 being retracted or extended.

[0052] Optionally, the driving member 121 is a holding brake motor. In this way, the holding brake motor can brake in the case of power loss, so as to ensure high self-maintenance in the case of power loss.

[0053] Optionally, the encoder is a relative encoder. Of course, in other embodiments, the encoder can also be other types, which are not limited in this regard.

[0054] In one embodiment, the fuel assembly underwater detection device further comprises a load sensor. The load sensor is used to detect the load of the driving member 121. Optionally, the torque load of the motor is converted through the control output current. In this way, the load borne by the motor can be obtained, so as to realize the monitoring of the load.

[0055] Further, when the load of the motor is greater than or less than a preset load, the motor stops running and triggers an alarm to alarm. The preset load can be set according to actual needs, which is not limited herein. Optionally, the preset load is 150% of the normal load (5 kg).

[0056] In one embodiment, the fuel assembly underwater detection device further comprises a remote control device. The remote control device is in communication connection with the driving member 121. In this way, the remote control device can remotely control the lifting mechanism 10 to rise or fall, without the need for too much intervention of the operating personnel.

[0057] Further, the remote control device is in communication connection with the encoder and the load sensor. The remote control device is provided with a display screen. When in use, the encoder and the load sensor can send the detection results to the remote control device, and the display screen of the remote control device displays the information of the encoder, the load sensor and the alarm, for example, the display screen can display the rotation speed, the height, the load of the motor and the alarm prompt.

[0058] It should be noted that the detection values displayed on the display screen are mainly for reference, and the actual values are subject to the environmental reference.

[0059] In one embodiment, the driving assembly 12 is capable of driving the telescopic assembly 11 to extend, so that the telescopic assembly 11 has a preset extension length. In this way, the steel wire rope is prevented from being released completely and lifted reversely.

[0060] Further, the fuel assembly underwater detection device further comprises a limit sensor, which is arranged at the second end 113 of the telescopic assembly 11 and electrically connected with the driving assembly 12. In use, the driving member 121 is started to drive the winding drum 122 to rotate around its own axis, thereby driving the steel wire rope to be released and the telescopic assembly 11 to extend. The release length of the steel wire rope corresponds to the extension length of the telescopic assembly 11. When the limit sensor detects that the telescopic assembly 11 is at the preset extension length, the driving assembly 12 stops moving. In this way, the steel wire rope is prevented from being released completely and lifted reversely.

[0061] Alternatively, the detection object of the limit sensor can be the steel wire rope. When the limit sensor detects that there are two turns of the steel wire rope left on the winding drum 122, the driving assembly 12 stops moving. Of course, in other embodiments, the detection object of the limit sensor can be the driving member 121. When the limit sensor detects that the driving member 121 rotates a preset number of turns, the driving assembly 12 stops moving.

[0062] In one embodiment, one end of the steel wire rope away from the telescopic assembly 11 is wound around the first end 112 of the winding drum 122. The first end 112 of the winding drum 122 is provided with a rope pressing member, which is alternatively a pressing plate or a pressing drum. The rope pressing member extends along the axial direction of the winding drum 122 and is used to press one end of the steel wire rope away from the telescopic assembly 11 into the spiral rope groove 1222. In this way, the steel wire rope is prevented from being released completely and lifted reversely.

[0063] Alternatively, the rope pressing member is located above at least two turns of the spiral rope groove 1222 to press at least two turns of the steel wire rope into the spiral rope groove 1222.

[0064] In one embodiment, the fuel assembly underwater detection device further comprises a limit switch 60. The limit switch 60 is arranged at the second end 113 of the telescopic assembly 11 and electrically connected with the driving assembly 12. Alternatively, the telescopic sleeve 111 at the first end 112 is provided with a triggering member and the telescopic sleeve 111 at the second end 113 is provided with the limit switch 60. When the telescopic assembly 11 is contracted, the triggering member cooperates with the limit switch 60 to trigger the driving assembly 12 to stop moving.

[0065] Specifically, the driving assembly 12 comprises a mounting frame, a driving member 121, a winding drum 122 and a steel wire rope. The driving member 121 is mounted on the mounting frame, the driving end of the driving member 121 is connected with the winding drum 122, and the steel wire rope is wound on the winding drum 122. In use, the driving member 121 is started, the driving member 121 drives the winding drum 122 to rotate around its own axis, and then drives the steel wire rope to be wound, and the steel wire rope drives the telescopic assembly 11 to be contracted, wherein the winding length of the steel wire rope is equivalent to the contraction length of the telescopic assembly 11. When the telescopic assembly 11 is contracted, the telescopic sleeve 111 moves towards the direction close to the second end 113, and when the trigger member cooperates with the limit switch 60, the driving assembly 12 is triggered to stop running. In this way, by arranging the limit switch 60, the stop of the driving assembly 12 can be automatically controlled, so as to avoid that the driving member 121 drives the winding drum 122 to rotate all the time, the steel wire rope is excessively wound, and the fuel assembly underwater detection device is damaged.

[0066] Further, the fuel assembly underwater detection device further comprises a second cable, and the second cable is electrically connected with the limit switch 60. Wherein, the second cable is a shielded cable, and the second cable is re-coated after the test is completed.

[0067] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0068] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0069] In this application, unless otherwise clearly indicated and limited, if there are terms such as "mount", "connect", "connect", "fix", etc., these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0070] In this application, unless otherwise clearly indicated and limited, if there are terms such as "mount", "connect", "connect", "fix", etc., these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0071] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation.

[0072] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

[0073] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. An apparatus for underwater inspection of a fuel assembly, comprising: The device comprises a lifting mechanism and a camera, the lifting mechanism comprises a telescopic assembly and a driving assembly, the telescopic assembly has a first end for extending into water, the camera is installed on the first end, the camera is used for shooting images of the fuel assembly under water, the driving assembly is connected with the telescopic assembly, and the driving assembly is used for driving the telescopic assembly to extend or retract so as to drive the camera to lift or lower.

2. The fuel assembly underwater inspection apparatus according to claim 1, characterized by The telescopic assembly comprises at least two telescopic sleeves, one of the telescopic sleeves is connected with the driving assembly, and the other of the telescopic sleeves is connected with the camera, and adjacent two telescopic sleeves are nested and can move relatively.

3. The fuel assembly underwater inspection apparatus of claim 2, wherein, Each telescopic sleeve is provided with a water flow hole, and the water flow hole is communicated with a lumen of the telescopic sleeve.

4. The fuel assembly underwater inspection apparatus according to claim 3, characterized by The device further comprises an adapter and a mounting rack, one end of the adapter is arranged in the telescopic sleeve at the first end, and the mounting rack is mounted on the end of the adapter away from the telescopic sleeve, and the camera is mounted on the mounting rack.

5. The fuel assembly underwater inspection apparatus of claim 4, wherein, The adapter is provided with a water drainage groove, and the water drainage groove is communicated with the water flow hole.

6. The fuel assembly underwater inspection apparatus according to any one of claims 2 to 5, characterized by The telescopic assembly further has a second end arranged opposite to the first end, the driving assembly comprises a mounting rack, a driving member, a winding drum and a steel wire rope, the driving member is mounted on the mounting rack, a driving end of the driving member is connected with the winding drum, the steel wire rope is wound on the winding drum, one end of the steel wire rope away from the winding drum is connected with the telescopic assembly, and the driving member is used for driving the winding drum to rotate around its own axis so as to drive the steel wire rope to be wound or unwound.

7. The fuel assembly underwater inspection apparatus of claim 6, wherein, One end of the steel wire rope away from the telescopic assembly is wound on the winding drum, the winding drum is provided with a rope pressing member, the rope pressing member extends along the axial direction of the winding drum, and is used for pressing one end of the steel wire rope away from the telescopic assembly on the winding drum.

8. The fuel assembly underwater inspection apparatus of claim 6, wherein, The device further comprises a limit switch, the limit switch is arranged in the telescopic sleeve at the second end, the limit switch is electrically connected with the driving assembly, and the other telescopic sleeve is provided with a triggering member, when the telescopic assembly is retracted, the triggering member cooperates with the limit switch to trigger the driving assembly to stop running.

9. The fuel assembly underwater inspection apparatus of claim 6, wherein, The device further comprises a limit sensor, and the limit sensor is arranged at the second end. When the telescopic assembly is extended, the limit sensor is used for detecting the number of turns of the steel wire rope on the winding drum, and the driving member stops running when the number of turns of the steel wire rope is a preset number of turns; or the limit sensor is used for detecting the number of rotation turns of the driving member, and the driving member stops running when the number of rotation turns is a preset number of turns.

10. The fuel assembly underwater inspection apparatus according to any one of claims 1 to 5, characterized by The camera comprises a seat body and a camera head, the seat body is rotatably mounted on the lifting mechanism, the seat body can rotate around a direction parallel to the lifting direction, and the camera head is rotatably mounted on the seat body, and the camera head can perform pitching motion relative to the seat body around a direction intersecting with the lifting direction.

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