Reactor core fuel assembly transfer device of nuclear reactor

Abstract

A reactor core fuel assembly transfer device of a nuclear reactor comprises a driving mechanism, a transfer track, a transfer trolley and a loader, the transfer trolley comprises a trolley body, walking wheels and guide wheels, and the walking wheels and the guide wheels are arranged on the trolley body. The end, away from the driving mechanism, of the bottom plate is provided with a hole used for allowing the loader to pass through in an overturning mode. The walking wheels and the guide wheels are installed on the left side wall and the right side wall of the trolley body respectively, and the transfer trolley can walk along the transfer rail in a rail crossing mode through the walking wheels and the guide wheels. One end of the loader is hinged to the transfer trolley and turns over with a hinge shaft as the circle center. The driving mechanism is a push-pull driving mechanism, and the push-pull driving mechanism drives the transfer trolley to walk along the transfer track; the transfer trolley drives the loader to be matched with the transfer rail in the fuel plant and the reactor plant to achieve switching between the horizontal position and the vertical position of the loader, and transfer of the fuel assembly is completed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the core fuel assembly refueling technology of nuclear reactor of nuclear power plant, especially a kind of core fuel assembly transfer device of nuclear reactor suitable for pressurized water reactor nuclear power plant. BACKGROUND

[0002] Nuclear power generation, as a clean energy that does not produce greenhouse gases, is increasingly valued. As a typical representative of nuclear power generation technology, pressurized water reactor nuclear power plants have high power generation efficiency and fuel utilization rate, reducing energy waste, and are therefore widely used.

[0003] During the operation of a pressurized water reactor nuclear power plant, the fuel assemblies in the reactor core are continuously burned and converted into spent fuel assemblies. To ensure the normal operation of the nuclear power plant, the fuel assemblies in the core must be replaced periodically. The core of the nuclear power plant is located in the reactor building (RX side), and the fuel assemblies to be loaded and the spent fuel assemblies removed from the core are stored in the fuel building (KX side). The reactor building and the fuel building are isolated by a thick containment wall. In most pressurized water reactor nuclear power plants, the fuel assembly transfer device operates on the RX side rail, the KX side rail, and the transfer channel through a transport cart. One set of drive mechanisms is provided on each side of the reactor building and the fuel building. The gear on the two sets of drive mechanisms drives the rack on the transport cart, completing the task of transporting the fuel assemblies from the reactor building to the fuel building via the transfer channel. Each side of the reactor building and the fuel building has a tilting frame, which is bolted to the RX side rail and the KX side rail, respectively. When the carrier moves into position with the transport cart, the tilting frame completes the overturning with the carrier. The carrier is overturned to a vertical state, and the fuel assemblies are loaded or removed vertically from the top of the carrier.

[0004] The existing fuel assembly transfer device mainly has the following problems:

[0005] 1) The gear on the two sets of drive mechanisms installed on the reactor building and the fuel building drives the rack on the transport cart, completing the transfer of the fuel assemblies between the reactor building (RX side) and the fuel building (KX side). This transmission method requires high precision in the processing and assembly of the guide rail and the rack, resulting in high cost of the transfer device, complex control program, risk of transport cart jamming, and low reliability.

[0006] 2) Two sets of tilting frames are required on each side of the reactor building and the fuel building, along with corresponding motors and transmission mechanisms to drive the steel cable to complete the overturning operation of the carrier, resulting in high cost of the transfer device. Due to the need for coordination of multiple control units, the control program is complex, and the system is difficult to maintain and operate.

[0007] 3) The turnover of the carrier adopts a single-axis steel cable pulling mode, and the reliability is low, and the fuel assembly is prone to falling after the accidental damage of the steel cable;

[0008] 4) The gap between the side wall of the carrier and the fuel assembly is only 5mm, and the fuel assembly of more than 4m in length is vertically loaded and unloaded from the top of the carrier, and since the gap is narrow, the fuel assembly is prone to being scratched during operation, in order to reduce the risk of damage of the fuel assembly due to scratching, the speed of loading and unloading the fuel assembly into and out of the carrier is usually limited, thereby causing low efficiency of loading and unloading the fuel assembly. Utility model content

[0009] The utility model solves the technical problem in the prior art, and provides a nuclear reactor core fuel assembly transfer device and method.

[0010] In order to achieve the above-mentioned purpose, the utility model provides a nuclear reactor core fuel assembly transfer device, including drive mechanism, transfer track, transfer trolley and carrier, wherein, the transfer trolley includes car body and setting walking wheel and guide wheel on the car body, one end of the car body is connected with the drive mechanism, and the bottom plate is provided with hole for the carrier to turn over on one end away from the drive mechanism;The walking wheel and the guide wheel are installed on the left side wall and the right side wall of the car body respectively, and the transfer trolley realizes cross rail walking along the transfer track through the walking wheel and the guide wheel;One end of the carrier is hinged with the transfer trolley and turns over with the hinged shaft as the center;

[0011] Wherein, the drive mechanism is push-pull drive mechanism, and the push-pull drive mechanism drives the transfer trolley to walk along the transfer track;The transfer trolley drives the carrier to switch the horizontal position and the vertical position in the fuel factory building and the reactor factory building respectively in cooperation with the transfer track, and completes the transfer of the fuel assembly.

[0012] The nuclear reactor core fuel assembly transfer device, wherein the transfer track includes:

[0013] KX side transfer track, including KX side straight track and KX side turnover track, the KX side straight track is located in the spent fuel pool of the fuel factory building;The KX side turnover track is arranged above the KX side straight track and is used for realizing the turnover of the vertical position and the horizontal position of the carrier;

[0014] RX side transfer track, including RX side straight track and RX side turnover track, the RX side straight track is located in the refueling pool of the reactor factory building;The RX side turnover track is arranged above the RX side straight track and is used for realizing the turnover of the vertical position and the horizontal position of the carrier;

[0015] A transfer channel is arranged through the containment wall between the fuel building and the reactor building, and an inner track is arranged in the transfer channel, two ends of the inner track correspond to the KX-side straight track and the RX-side straight track respectively;

[0016] A track changing mechanism is arranged at the bottom of the RX-side straight track corresponding to the RX-side turnover track, and is used to switch the height of the RX-side turnover track entrance position; the bottom of the transfer trolley is provided with a contact block corresponding to the track changing mechanism.

[0017] The nuclear reactor core fuel assembly transfer device, wherein the KX-side turnover track comprises a KX-side fixed frame and a KX-side arc-shaped track, the KX-side fixed frame is symmetrically arranged on both sides of the KX-side straight track, and the KX-side arc-shaped tracks on both sides are connected with the KX-side fixed frames on the same side, the spacing of the KX-side arc-shaped tracks on both sides is matched with the carrier, and the guide wheels on both sides of the carrier run along the KX-side arc-shaped tracks to realize the turnover of the vertical position and the horizontal position of the carrier.

[0018] The nuclear reactor core fuel assembly transfer device, wherein the RX-side turnover track comprises an RX-side fixed frame and an RX-side arc-shaped track, the RX-side fixed frame is symmetrically arranged on both sides of the RX-side straight track, and the spacing of the RX-side arc-shaped tracks on both sides is matched with the carrier; the RX-side arc-shaped track comprises a fixed track and a swing track, the fixed track is arranged on the RX-side fixed frame; the end of the fixed track is connected with the upper end of the swing track, the end of the swing track is provided with a support positioning block, and the RX-side straight track is provided with a support positioning portion corresponding to the support positioning block; the track changing mechanism is arranged at the bottom of the RX-side straight track corresponding to the support positioning block, and the track changing mechanism switches the swing track between the lowered position and the raised position through the driving control of the transfer trolley.

[0019] The nuclear reactor core fuel assembly transfer device, wherein the RX-side fixed frame is provided with an upper limiting beam and / or a lower limiting beam on the side close to the KX-side building, and the two ends of the upper limiting beam and the lower limiting beam are connected with the RX-side fixed frame on the corresponding side.

[0020] The nuclear reactor core fuel assembly transfer device, wherein the KX-side straight track and the RX-side straight track respectively comprise a straight track, a plurality of supports and an adjusting foot, the straight track is arranged and supported on the plurality of supports, and the bottom end of each support is provided with the adjusting foot; the connection part of the straight track and the inner track is provided with a guide port, and the RX-side straight track is provided with a limiting block close to the guide port; the KX-side straight track is provided with a limiting baffle at the end, and the RX-side straight track is provided with a connecting plate at the end.

[0021] The nuclear reactor core fuel assembly transfer device, wherein the carrier comprises:

[0022] The carrier comprises a left side plate, a right side plate, a rear side plate, a front side plate and a carrier bottom plate, the left side plate, the right side plate, the rear side plate and the front side plate are connected with the carrier bottom plate respectively and enclosed into a rectangular box with an open top and front;

[0023] The guide wheels are symmetrically installed at one end of the left side plate and the right side plate close to the top;

[0024] The hinge shafts are symmetrically installed at one end of the left side plate and the right side plate close to the bottom; the carrier is installed on the transfer trolley through the hinge shafts and flipped around the axis of the hinge shafts to realize the conversion between the vertical position and the horizontal position; and

[0025] The anti-toppling mechanism is installed at one side of the left side plate and / or the right side plate close to the front opening and at one end close to the top.

[0026] The nuclear reactor core fuel assembly transfer device, wherein the anti-toppling mechanism comprises:

[0027] The limiting plates are symmetrically installed on the left side plate and the right side plate through the fixing blocks respectively, and the limiting plates have an open position and a retracted position relative to the fixing blocks respectively;

[0028] The transmission mechanism comprises an upper pull rod, a lower pull rod and a pull rod reset piece, two ends of the upper pull rod are connected with the limiting plates and the lower pull rod respectively, and the pull rod reset piece is connected with the upper pull rod and the lower pull rod respectively; and

[0029] The control mechanism is arranged on the carrier bottom plate and connected with the transmission mechanism to control the switching of the limiting plates between the open position and the retracted position.

[0030] The nuclear reactor core fuel assembly transfer device, wherein the control mechanism comprises a base, a support block and a base reset piece, the rear end of the base is hinged with the carrier bottom plate; the support block is installed on the carrier bottom plate corresponding to the front end of the base; the base reset piece is located between the base and the carrier bottom plate; the lower end of the lower pull rod is connected with the base and drives the base to swing up and down with the base reset piece as the center of the hinge point, and the base has a pressing position and a releasing position relative to the carrier bottom plate respectively; when the base is located at the pressing position, the limiting plates are switched to the open position, and when the base is located at the releasing position, the limiting plates are switched to the retracted position.

[0031] The nuclear reactor core fuel assembly transfer device described above, wherein, a blind flange is installed at the port of the transfer channel on the side of the refueling pool of the reactor building, and a manual gate valve is installed at the other port of the transfer channel on the side of the spent fuel pool of the fuel building.

[0032] The technical effect of the present application is that:

[0033] The fuel assembly transfer device of the present application is suitable for pressurized water reactor nuclear power plants, and solves the problems of high cost and complex control program caused by the need to set up a tilting frame in the fuel building and the reactor building in the prior art fuel assembly transfer device, low reliability of the tilting mode of the carrier, the risk of falling of the fuel assembly after accidental damage of the steel cable, and long time and low efficiency of loading and unloading the fuel assembly into and from the carrier. The present application uses a rigid push-pull mechanism to drive the transfer trolley to realize the horizontal transfer and tilting of the carrier, which reduces the control difficulty of the fuel assembly transfer device, reduces the cost, and improves the reliability. The tilting of the carrier is a simply supported structure, which is more reliable than the single-axis structure, and the fuel assembly does not have the risk of falling. The carrier can realize the translational loading and unloading of the fuel assembly, and significantly improves the transfer efficiency.

[0034] The present application will be described in detail below in combination with the drawings and specific embodiments, but is not limited to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the fuel assembly transfer device of an embodiment of the present application.

[0036] Figure 2A It is a structural schematic diagram of the KX-side straight rail of an embodiment of the present application.

[0037] Figure 2B It is a side view of the KX-side straight rail of an embodiment of the present application.

[0038] Figure 3 It is a structural schematic diagram of the RX-side straight rail of an embodiment of the present application.

[0039] Figure 4 It is a structural schematic diagram of the KX-side tilting rail of an embodiment of the present application.

[0040] Figure 5A It is a structural schematic diagram of the RX-side tilting rail of an embodiment of the present application.

[0041] Figure 5B It is a schematic diagram of the installation position of the rail changing mechanism of an embodiment of the present application.

[0042] Figure 5C It is Figure 5Benlarged view of

[0043] Figure 6 structure schematic view of the push-pull driving mechanism of an embodiment of the present utility model;

[0044] Figure 7 installation schematic view of the carrier and the transfer trolley of an embodiment of the present utility model;

[0045] Figure 8A structure schematic view of the transfer trolley of an embodiment of the present utility model;

[0046] Figure 8B is Figure 8A top view;

[0047] Figure 9A structure schematic view of the carrier of an embodiment of the present utility model;

[0048] Figure 9B structure schematic view of the carrier of an embodiment of the present utility model;

[0049] Figure 9C structure schematic view of the anti-toppling mechanism of an embodiment of the present utility model;

[0050] Figure 9D is Figure 9C enlarged view of

[0051] wherein, the reference sign

[0052] 1 transfer trolley

[0053] 11 trolley body

[0054] 111 bottom plate

[0055] 1111 hole

[0056] 112 rear side wall

[0057] 113 front side wall

[0058] 114 left side wall

[0059] 115 right side wall

[0060] 12 running wheel

[0061] 13 running guide wheel

[0062] 14 hinged hole

[0063] 2 carrier

[0064] 21 carrier body

[0065] 211 left side plate

[0066] 212 right side plate

[0067] 213 rear side plate

[0068] 214 front side plate

[0069] 215 bearing bottom plate

[0070] 216 guide bevel

[0071] 22 anti-toppling mechanism

[0072] 221 limiting plate

[0073] 222 fixing block

[0074] 223 upper pull rod

[0075] 224 pull rod reset member

[0076] 225 lower pull rod

[0077] 226 hinged block

[0078] 227 supporting block

[0079] 228 base

[0080] 229 base reset member

[0081] 23 guide wheel

[0082] 24 reinforcing rib

[0083] 25 hinged shaft

[0084] 3 push-pull driving mechanism

[0085] 31 driving component

[0086] 311 motor

[0087] 312 speed reducer

[0088] 313 first transmission shaft

[0089] 314 emergency hand wheel

[0090] 32 transmission component

[0091] 321 chain library

[0092] 322 rigid chain

[0093] 323 second transmission shaft

[0094] 33 quick connector

[0095] 34 quick mounting structure

[0096] transfer track

[0097] 41 KX side transfer track

[0098] 411 KX side straight rail

[0099] 4111 KX side straight rail

[0100] 41111 bottom surface

[0101] 41112 side surface

[0102] 41113 top surface

[0103] 41114 rigid chain guide groove

[0104] 4112 KX side bracket

[0105] 4113 KX side adjusting foot

[0106] 4114 limiting baffle

[0107] 412 KX side overturning rail

[0108] 4121 KX side arc-shaped rail

[0109] 4122 fixing frame

[0110] 4123 connecting column

[0111] 4124 reinforcing leg

[0112] 4125 connecting beam

[0113] 4126 KX side overturning adjusting foot

[0114] 42 transfer channel

[0115] 421 inner rail

[0116] 43 RX side transfer rail

[0117] 431 RX side straight rail

[0118] 4311 RX side straight rail

[0119] 4312 connecting plate

[0120] 4313 supporting positioning portion

[0121] 4314 RX side adjusting foot

[0122] 4315 RX side bracket

[0123] 432 RX side overturning rail

[0124] 4321 RX side arc-shaped rail

[0125] 43211 fixing rail

[0126] 43212 swing rail

[0127] 4322 support positioning block

[0128] 4323 RX side fixing frame

[0129] 43231 upper limiting beam

[0130] 43232 lower limiting beam

[0131] 4324 RX side overturning foot

[0132] 4325 RX side connecting column

[0133] 4326 RX side reinforcing leg

[0134] 4327 RX side connecting beam

[0135] 44 rail changing mechanism

[0136] 5 blind plate flange

[0137] 6 manual gate valve DETAILED DESCRIPTION

[0138] The structural principle and working principle of the utility model will be specifically described in combination with the drawings as follows:

[0139] The nuclear reactor core fuel assembly transfer device of the utility model is the key equipment for replacing fuel assemblies during the shutdown of a nuclear power plant, is mainly used for transferring fuel assemblies between a reactor plant and a fuel plant, and plays an important role in the shutdown and refueling process of a pressurized water reactor nuclear power plant.

[0140] Referring to Figure 1 , Figure 1The utility model discloses a fuel assembly transfer device structure schematic drawing of one embodiment. The utility model discloses a fuel assembly transfer device is applicable to the fuel assembly transfer of pressurized water reactor nuclear power plant, including transfer trolley 1, carrier 2, push -and -pull drive mechanism 3, KX side transfer track 41 (including KX side straight track 411 and KX side turnover track 412), transfer channel 42, be provided with inner track 421, RX side transfer track 43 (including RX side straight track 431 and RX side turnover track 432) and variable track mechanism 44 in transfer channel 42. Push -and -pull drive mechanism 3, KX side straight track 411, KX side turnover track 412 are installed in the spent fuel pool of fuel plant, and RX side straight track 431, RX side turnover track 432 are installed in the refueling pool of reactor plant;Transfer channel 42 is installed in the containment wall between fuel plant and reactor plant, and inner track 421 is installed in transfer channel 42, the section structure of inner track 421 of this embodiment is identical with the section structure of KX side straight track 411, and both ends are provided with easy to guide horn mouth, avoid the transfer trolley 1 and appear the stagnation when crossing rail;Variable track mechanism 44 is installed at the bottom of RX side straight track 431;Transfer trolley 1 walks back and forth on KX side straight track 411, RX side straight track 431 and inner track 421 to complete the transfer work of fuel assembly;Push -and -pull drive mechanism 3 provides power for transfer trolley 1;Carrier 2 is hinged on transfer trolley 1 and can overturn with hinged shaft 25 as the center;KX side turnover track 412 can make carrier 2 realize the overturning of horizontal state and vertical state in fuel plant;RX side turnover track 432 can make carrier 2 realize the overturning of horizontal state and vertical state in reactor plant.

[0141] This embodiment can also include blind plate flange 5 and manual gate valve 6, and the blind plate flange 5 is installed in the transfer channel 42 port of the refueling pool side of reactor plant, and the manual gate valve 6 is installed in the other port of the transfer channel 42 of the spent fuel pool side. After the core fuel assembly replacement is completed, close the manual gate valve 6, discharge the water of the refueling pool of reactor plant, install the blind plate flange 5, realize the sealing of the transfer channel 42.

[0142] In the embodiment, the transfer track 4 comprises: a KX-side transfer track 41 comprising a KX-side straight track 411 located in a spent fuel pool of a fuel building and a KX-side turnover track 412 arranged above the KX-side straight track 411 and used for realizing turnover of the vertical position and the horizontal position of the carrier 2 in cooperation with the transfer trolley 1; an RX-side transfer track 43 comprising an RX-side straight track 431 located in a refueling pool of a reactor building and an RX-side turnover track 432 arranged above the RX-side straight track 431 and used for realizing turnover of the vertical position and the horizontal position of the carrier 2 in cooperation with the transfer trolley 1; a transfer channel 42 installed through a containment wall between the fuel building and the reactor building, wherein an inner track 421 is installed in the transfer channel 42, and both ends of the inner track 421 are arranged corresponding to the KX-side straight track 411 and the RX-side straight track 431 respectively to realize smooth cross-rail walking of the transfer trolley 1; and a track changing mechanism 44 arranged at the bottom of the RX-side straight track 431 corresponding to the RX-side turnover track 432 and used for realizing high-low switching of the RX-side turnover track 432 entry position in cooperation with the transfer trolley 1 or the carrier 2; a contact block for driving the track changing mechanism 44 is arranged at the bottom of the transfer trolley 1; wherein the driving mechanism is a push-pull driving mechanism 3 connected with the transfer trolley 1 and driving the transfer trolley 1 to walk along the KX-side straight track 411, the inner track 421 and the RX-side straight track 431; one end of the carrier 2 is hinged with the transfer trolley 1 and turns around the hinged shaft 25, and the transfer trolley 1 drives the carrier 2 to realize high-low switching of the horizontal position and the vertical position through the KX-side turnover track 412 and the RX-side turnover track 432 respectively in the fuel building and the reactor building, thereby completing transfer of the fuel assembly.

[0143] Referring to Figures 2A-3 , Figure 2A it is a KX-side straight track 411 structure schematic view of the utility model one embodiment, Figure 2B it is a KX-side straight track 411 side view of the utility model one embodiment, Figure 3The KX side straight track 411 is located in a spent fuel pool of a fuel plant house, and is used for storage and walking guidance of the transfer trolley 1; and the RX side straight track 431 is located in a refueling pool of a reactor plant house, and is used for supporting the transfer trolley 1 and serving as a running track of the transfer trolley 1. The KX side straight track 411 and the RX side straight track 431 of the embodiment respectively comprise: a straight track, a plurality of supports (including a KX side support 4112 and an RX side support 4315), and adjusting feet (including a KX side adjusting foot 4113 and an RX side adjusting foot 4314), the straight track is mounted and supported on the plurality of supports, the stability and the carrying capacity of the track are ensured, the adjusting feet are symmetrically arranged at the bottom ends of each support respectively, the adjusting feet are welded and fixed on a stainless steel bottom surface of the spent fuel pool, the adjusting feet are used for adjusting the height and the levelness of the straight track, the KX side straight track 411 and the inner track 421 are kept within a specified height deviation range through adjustment of the adjusting feet, the transfer trolley 1 is realized to stably cross-track walk between the two tracks, that is, the transfer trolley 1 is realized to stably cross-track walk between the KX side straight track 411, the inner track 421 and the RX side straight track 431. The connecting positions of the straight track and the inner track 421 are all provided with horn mouth-shaped guide openings, so that the transfer trolley 1 is effectively prevented from being stuck during cross-track walking; a limiting baffle 4114 is arranged at the end of the KX side straight track 4111, and a connecting plate 4312 is arranged at the end of the RX side straight track 4311.

[0144] The RX side straight track 431 of the embodiment is similar in structure to the KX side straight track 411, except that one end of the RX side straight track 431 is in the form of a horn mouth for easy guidance, and the other end is connected by the connecting plate 4312, which can prevent the transfer trolley 1 from accidentally leaving the track; the RX side adjusting foot 4314 is welded and fixed with the stainless steel bottom surface of the refueling pool of the reactor plant house.

[0145] The straight track and the inner track 421 are the same in structure, and take the KX side straight track 4111 as an example, and all comprise a bottom surface 41111, a side surface 41112 and an open top surface 41113, the bottom surface 41111 is provided with a rigid chain guide groove 41114 along the length direction, and is used for auxiliary guidance of the rigid chain 322; the bottom surface 41111 is a shared support surface of the transfer trolley 1 and the rigid chain 322, the side surface 41112 is a guide surface of the transfer trolley 1, and the top surface 41113 is used for preventing the transfer trolley 1 from accidentally leaving the track. The KX side straight track 411 realizes co-tracking of the transfer trolley 1 and the rigid chain 322, simplifies the track structure, and reduces the manufacturing cost.

[0146] Referring to Figure 4 , Figure 4The KX side turnover track structure schematic diagram of the utility model one embodiment, in the embodiment, the KX side turnover track 412 includes KX side fixed frame 4122 and KX side arc track 4121, KX side fixed frame 4122 is installed on the both sides of KX side straight track 411 through adjusting footing symmetry, and the both sides KX side arc track 4121 are connected with the KX side fixed frame 4122 of same side respectively, and two symmetrically arranged KX side arc track 4121 are connected with each other through connecting beam 4125 to enhance the overall rigidity of KX side turnover track 412, and the spacing of the both sides KX side arc track 4121 is adapted to the carrier 2, and the walking guide wheel 13 of the both sides of the carrier 2 runs along the track of KX side arc track 4121 respectively to realize the turnover of the vertical position and horizontal position of the carrier 2.KX side arc track 4121 is provided with the guide structure of flared mouth shape near one end of KX side straight track 411 to guide the guide wheel 23 of carrier 2 to switch smoothly between KX side arc track 4121 and KX side straight track 411.KX side fixed frame 4122 can be triangular fixed frame, rectangular fixed frame, L-shaped fixed frame or groove-shaped fixed frame, preferably triangular fixed frame, which can be adjusted according to actual requirements to adapt to different working environments.KX side arc track 4121 is connected with two KX side fixed frames 4122 through connecting column 4123, which increases the distance between two KX side fixed frames 4122 and provides sufficient space for the offset method loading of fuel assembly.KX side fixed frame 4122 is connected with the side wall of spent fuel pool using reinforcing leg 4124, and reinforcing leg 4124 is welded and fixed on the stainless steel side wall of spent fuel pool, and reinforcing leg 4124 has length adjustment function and can be adjusted in length according to actual requirements to adapt to the installation requirements of different positions.KX side fixed frame 4122 is connected with the bottom surface of spent fuel pool using KX side turnover adjusting footing 4126, and KX side turnover adjusting footing 4126 is welded and fixed on the stainless steel bottom surface of spent fuel pool.KX side turnover adjusting footing 4126 has height adjustment function, and the height of KX side turnover track 412 can be adjusted through KX side turnover adjusting footing 4126.

[0147] Referring to Figures 5A-5C , Figure 5A The RX side turnover track structure schematic diagram of the utility model one embodiment, Figure 5B The installation position schematic diagram of the track changing mechanism 44 of the utility model one embodiment, Figure 5C The Figure 5BFigure 16 is a partial enlarged view of the RX side overturning track 432. The RX side overturning track 432 is located on the reactor building side. In this embodiment, the RX side overturning track 432 includes RX side fixed frames 4323 and RX side arc-shaped tracks 4321. The RX side fixed frames 4323 are symmetrically installed on both sides of the RX side straight track 431 through RX side overturning footings 4324. The spacing between the RX side arc-shaped tracks 4321 on both sides is adapted to the carrier 2. The RX side fixed frames 4323 are provided with upper and lower limiting beams 43231 and 43232 on the side close to the KX side building, which are used to realize mechanical limiting of the carrier in the vertical state of the RX side building. The upper and lower limiting beams 43231 and 43232 are respectively connected with the RX side fixed frames 4323 on the corresponding side, and can be parallelly arranged at the lower part of the RX side fixed frames 4323, across the RX side straight track 431 and located at the position above the RX side straight track 431. In this embodiment, the RX side fixed frames 4323 are preferably right-angled triangular support structures. The upper and lower limiting beams 43231 and 43232 are parallelly arranged at the lower part of the vertical right-angle side of the triangular support structure. Only the upper limiting beam 43231 or the lower limiting beam 43232 can also be arranged and located at the position above the RX side straight track 431. The RX side arc-shaped track 4321 includes fixed tracks 43211 and swing tracks 43212. The fixed tracks 43211 are installed on the RX side fixed frames 4323. Two symmetrically arranged fixed tracks 43211 are connected with each other through an RX side connecting beam 4327 to enhance the overall rigidity of the RX side overturning track 432. The RX side arc-shaped track 4321 is connected with the two RX side fixed frames 4323 through an RX side connecting column 4325, which increases the distance between the two RX side fixed frames 4323 and provides sufficient space for the offset method of loading the fuel assembly. The RX side fixed frames 4323 are connected with the side wall of the refueling pool through RX side reinforcing legs 4326, which are welded and fixed on the stainless steel side wall of the refueling pool. The RX side reinforcing legs 4326 have a length adjustment function and can be adjusted in length according to actual needs to adapt to the installation requirements at different positions. The RX side fixed frames 4323 are connected with the bottom surface of the refueling pool through RX side overturning footings 4324, which are welded and fixed on the stainless steel bottom surface of the refueling pool. The RX side overturning footings 4324 have a height adjustment function and can adjust the height of the RX side overturning track 432 through the RX side overturning footings 4324.The end of the fixed rail 43211 is hinged to the upper end of the swing rail 43212, and the swing rail 43212 can swing with the hinged shaft as the center. The interface of the fixed rail 43211 and the swing rail 43212 is away from the position where the maximum pressure is borne by the guide wheel 23 during the overturning of the carrier 2. The bottom end of the swing rail 43212 is provided with a support positioning block 4322, and a support positioning part 4313 is arranged on the RX side straight rail 4311 corresponding to the support positioning block 4322. The rail changing mechanism 44 is arranged at the bottom of the RX side straight rail 4311 corresponding to the support positioning block 4322, and the swing rail 43212 can be raised and lowered through the rail changing mechanism 44. The lower end of the swing rail 43212 is in the shape of a horn for easy guiding, so that the guide wheel 23 on the carrier 2 can pass smoothly.

[0148] The rail changing mechanism 44 is arranged at the bottom of the RX side straight rail 4311 and is mainly used for switching the height position of the swing rail 43212. The rail changing mechanism 44 is preferably a pure mechanical structure without an independent power source and a control system, so that the swing rail 43212 cannot be in a wrong position, and the mechanism has fewer failure points, higher reliability, lower cost, no pollution, and no risk of polluting the reactor pool. In this embodiment, the rail changing mechanism 44 can be triggered by a contact block arranged at a corresponding position of the transfer trolley 1 to switch the swing rail 43212 between the lowered position and the raised position. When the swing rail 43212 is in the lowered position, the guide wheels 23 on both sides of the carrier 2 pass through the guide port of the swing rail 43212 along the track of the RX side arc rail 4321 to realize the overturning of the carrier 2 between the vertical position and the horizontal position. When the swing rail 43212 is in the raised position, the transfer trolley 1 can carry the carrier 2 to pass below the swing rail 43212. When the swing rail 43212 is in the lowered position, the support positioning block 4322 at the lower part of the swing rail 43212 is inserted into the groove of the support positioning part 4313, which can effectively prevent the swing rail 43212 from swinging left and right and improve the left-right rigidity of the swing rail 43212. The lower bottom surface of the swing rail 43212 is in contact with the upper top surface of the support positioning part 4313, so that the guide wheels 23 of the carrier 2 can enter the RX side arc rail 4321, and when the carrier 2 passes through the swing rail 43212, part of the gravity of the carrier 2 is transmitted to the RX side straight rail 4311 through the support positioning part 4313 and is not borne by the rail changing mechanism 44. The rail changing mechanism 44 can adopt various structures to adjust the swing rail 43212, as long as it can switch the swing rail 43212 between the lowered position and the raised position. When the rail changing mechanism 44 is a pure mechanical structure, it can be triggered by arranging corresponding parts on the transfer trolley 1 or the carrier 2. The rail changing mechanism 44 can also be an electromagnetic or electric structure, and the specific structure and the corresponding triggering mode can adopt mature existing technologies. The structure of the rail changing mechanism 44 and the triggering parts matched with the structure are not limited.

[0149] The RX side overturning track 432 is similar in structure to the KX side overturning track 412, except that the RX side arc-shaped track 4321 can swing and the height position of the RX side arc-shaped track 4321 can be changed through the track changing mechanism 44. The swing of the RX side arc-shaped track 4321 can be achieved through a hinged point or by relying on the elastic deformation of the arc-shaped track itself. The hinged point can be arranged at the upper part or the lower part of the RX side arc-shaped track 4321.

[0150] Referring to Figure 6 , Figure 6 It is a schematic structural view of the push-pull driving mechanism 3 of an embodiment of the utility model. The push-pull driving mechanism 3 of the embodiment can be a rigid push chain structure, a steel cable structure or a gear and rack structure, etc., as long as it can realize the pushing out and pulling back actions of the transfer trolley 1, and the specific form is not limited. It is preferably a rigid push chain structure, which can be installed and fixed on the side wall of the spent fuel pool, provides power for the transfer trolley 1, adopts a modular structure, includes a driving component 31 and a transmission component 32, and is divided into upper and lower parts. After the upper and lower parts are separated, they can be hoisted out of the spent fuel pool as a whole, which is convenient for maintenance. The driving component 31 of the upper part includes a motor 311, a speed reducer 312 and a first transmission shaft 313, the speed reducer 312 is connected with the motor 311 and the first transmission shaft 313 respectively, and the motor 311 and the speed reducer 312 are arranged and installed on the side of the spent fuel pool by means of bolting. The transmission component 32 of the lower part is installed on the side wall of the spent fuel pool through a quick mounting structure 34, the transmission component 32 includes a chain library 321, a rigid chain 322 and a second transmission shaft 323, the rigid chain 322 is installed in the chain library 321, one end of the second transmission shaft 323 is connected with the first transmission shaft 313 through a quick connector 33, and the other end of the second transmission shaft 323 is connected with the rigid chain 322 through a steering gear. Among them, the rigid chain 322 in the chain library 321 can adopt a single chain middle arrangement structure or a double chain two side arrangement structure, and the single chain middle arrangement structure is preferred, which is simple in structure and has no double chain length accumulation error problem. The rigid chain 322 is connected with the transfer trolley 1 through a quick mounting structure, and long rod tools can be used to realize remote disassembly and assembly. The driving component 31 can further include an emergency hand wheel 314 connected with the first transmission shaft 313, which can pull the transfer trolley 1 back to the spent fuel pool for resetting when the motor 311 or the control system fails. The driving component 31 is installed above the water surface of the spent fuel pool, and the underwater part is a pure mechanical transmission component 32, which has high reliability.

[0151] The transfer trolley 1 of this invention can travel on the transfer track 4 (including the KX side straight track 411, the RX side straight track 431, and the inner track 421) to complete the transfer task of fuel components. In this embodiment, the transfer track 4 includes a bottom surface, side surfaces, and an open top surface. The traveling wheels 12 are supported on the bottom surface, providing support for the transfer trolley 1 and enabling it to travel on the transfer track 4 (including the KX side straight track 411, the RX side straight track 431, and the inner track 421). The traveling guide wheels 13 contact the side surfaces and roll along them, providing left and right guidance for the transfer trolley 1. The transfer trolley 1 is engaged within the top surface to prevent accidental derailment. The rigid chain 322 provides power to the transfer trolley 1. The rigid chain 322 drive structure has low requirements for track machining and debugging precision, thereby effectively reducing manufacturing costs, assembly and debugging costs, and maintenance costs. Furthermore, the rigid chain 322 drive system operates without power alternation, eliminating the risk of jamming and power failure.

[0152] See Figures 7-8B , Figure 7 This is a schematic diagram of the installation of the carrier 2 and the transfer trolley 1 according to an embodiment of the present invention. Figure 8A This is a schematic diagram of the structure of the transfer trolley 1 according to an embodiment of the present invention. Figure 8B for Figure 8A A top view. The transfer trolley 1 of this embodiment includes a body 11 and traveling wheels 12 and traveling guide wheels 13 mounted on the body 11. The body 11 is a rectangular cavity structure with an open upper section, including a base plate 111, a rear side wall 112, a front side wall 113, a left side wall 114, and a right side wall 115. One end of the body 11 is connected to a push-pull drive mechanism 3. The end of the base plate 111 away from the push-pull drive mechanism 3 has a hole 1111 for the carrier 2 to flip and pass through. Multiple traveling wheels 12 and traveling guide wheels 13 are respectively mounted on the left side wall 114. On the left and right side walls 115, the transfer trolley 1 travels across the discontinuous transfer track 4 via the traveling wheels 12 and the traveling guide wheels 13. The number of traveling wheels 12 and traveling guide wheels 13 installed on the left and right side walls 115 can be adjusted according to actual needs to adapt to different working environments and track configurations. The left and right side walls 114 and 115 of the vehicle body 11 are respectively provided with concentric hinge holes 14 for connecting the carrier 2. The hinge shaft 25 of the carrier 2 passes through the hinge hole 14, and the carrier 2 can rotate around the hinge shaft 25. The hinge hole 14 is located at the front of the vehicle body 11.

[0153] See Figure 9A and Figure 9B , Figure 9A This is a schematic diagram of the carrier 2 according to an embodiment of the present invention. Figure 9BThe carrying body 21 of the embodiment comprises: a left side plate 211, a right side plate 212, a rear side plate 213, a front side plate 214 and a carrying bottom plate 215, the left side plate 211, the right side plate 212, the rear side plate 213 and the front side plate 214 are connected with the carrying bottom plate 215 and enclose a rectangular box body with an open top and front, and the rectangular box body is used for accommodating the fuel assemblies to be transported; wherein, a guide inclined angle 216 is arranged at the open top and front of the carrying body 21 to facilitate the fuel assemblies to enter; the heights of the left side plate 211, the right side plate 212 and the rear side plate 213 are equal, the height of the front side plate 214 is 3%-5% of the height of the rear side plate 213, preferably, the height of the front side plate 214 is twice the height of the lower tube base of the fuel assembly; a guide wheel 23 is symmetrically installed at one end of the left side plate 211 and the right side plate 212 close to the top; a hinged shaft 25 is symmetrically installed at one end of the left side plate 211 and the right side plate 212 close to the bottom; the carrying body 21 is installed on the transport trolley 1 through the hinged shaft 25 and is turned around the axis of the hinged shaft 25 to realize the conversion between the vertical position and the horizontal position; and an anti-toppling mechanism 22 is installed on one side of the left side plate 211 and / or the right side plate 212 close to the front opening and is located at one end close to the top to prevent the fuel assemblies to be transported from falling out of the front opening together with the front side plate 214.

[0154] The embodiment further comprises a plurality of reinforcing ribs 24 which are arranged in parallel on the outer surfaces of the left side plate 211, the rear side plate 213 and the right side plate 212 to prevent the expansion and deformation of the front opening of the carrying body 21, improve the rigidity of the carrying device 2 and effectively protect the fuel assemblies during the transportation. The reinforcing ribs 24 are preferably U-shaped integral structural members. The distribution of the reinforcing ribs 24 can be determined according to the deformation degree of the opening of the carrying body 21 during the turning of the carrying device 2, and the reinforcing ribs 24 are more densely distributed in the upper and middle regions of the carrying body 21, while they are more sparsely distributed in the remaining regions, that is, the distribution density of the reinforcing ribs 24 is adapted to the deformation degree of the opening of the carrying body 21 during the turning of the carrying device 2, and the spacing between adjacent reinforcing ribs 24 in the upper and middle regions of the carrying body 21 is smaller than that in the lower region of the carrying body 21. When the carrying device 2 is in the horizontal state, the U-shaped bottom of the reinforcing rib 24 is in contact with the bottom plate 111 of the vehicle body 11, and the weight of the carrying device 2 and the internal fuel assemblies directly acts on the transport trolley 1, and the rear side wall 112 of the transport trolley 1 can prevent the fuel assemblies from escaping from the carrying device 2 when the carrying device 2 is in the horizontal state.

[0155] Referring to Figure 9C and Figure 9D , Figure 9C the installation schematic view of the anti-toppling mechanism 22 of the embodiment of the utility model, Figure 9D theFigure 9C The local enlarged view of the anti-toppling mechanism 22. The anti-toppling mechanism 22 of the present embodiment comprises: a limiting plate 221 symmetrically installed on the left side plate 211 and the right side plate 212 through fixing blocks 222, the fixing blocks 222 are symmetrically arranged and installed on the left side plate 211 and the right side plate 212, preferably, the limiting plate 221 and the fixing blocks 222 are close to and above the guide wheels 23, or are located at the middle position between the guide wheels 23 and the top end of the carrier 21; two holes are arranged on the limiting plate 221, one hole is hinged with the fixing block 222, and the other hole is hinged with an upper pull rod 223, the limiting plate 221 has an opening position and a retracted position relative to the fixing block 222, the distance from the limiting plate 221 to the top end of the carrier 21 is 3% to 4% of the height of the carrier 21, preferably, the limiting plate 221 is arranged at the middle position of the upper nozzle corresponding to the fuel assembly; a transmission mechanism comprising the upper pull rod 223, a lower pull rod 225 and a pull rod return member 224, both ends of the upper pull rod 223 are connected with the limiting plate 221 and the lower pull rod 225 respectively, the pull rod return member 224 is connected with the upper pull rod 223 and the lower pull rod 225 respectively, the pull rod return member 224 is preferably a pull rod spring, the lower pull rod 225 passes through the hole of the pull rod spring and the reinforcing rib 24, one end is hinged with the upper pull rod 223, and the other end is hinged with a base 228; and a control mechanism arranged on the carrier bottom plate 215 and connected with the transmission mechanism, used for controlling the limiting plate 221 to switch between the opening position and the retracted position.

[0156] In the embodiment, the control mechanism comprises a base 228, a support block 227 and a base reset member 229. The rear end of the base 228 is hinged to the bearing bottom plate 215 through a hinge block 226, the hinge block 226 is installed on the bearing bottom plate 215, the base 228 is hinged to the hinge block 226, and the base 228 can rotate around the hinge point as the center. The support block 227 corresponding to the front end of the base 228 is installed on the bearing bottom plate 215, preferably two hinge blocks 226 and two support blocks 227 are respectively installed on the four corners of the bearing bottom plate 215. The base reset member 229 is located between the base 228 and the bearing bottom plate 215, which is preferably a base spring, and is arranged at the middle position close to the front side of the base 228 and the bearing bottom plate 215. The base 228 can swing up and down around the hinge point under the action of the base spring. The lower end of the pull-down rod 225 is connected with the base 228 and drives the base 228 to swing up and down around the hinge point together with the base reset member 229. The base 228 has a pressing position and a release position relative to the bearing bottom plate 215. When the base 228 is in the pressing position, the limiting plate 221 switches to the open position, and when the base 228 is in the release position, the limiting plate 221 switches to the retracted position. The fuel assembly is placed on the base 228, and the limiting plate 221 is swung out to the open position to prevent it from falling over. When the fuel assembly is lifted, the limiting plate 221 is automatically reset to the retracted position under the action of the control mechanism. The swinging out and retracting of the limiting plate 221 is realized in a passive manner through mechanical structure, which is simple in structure and safe and reliable.

[0157] In operation, the KX side overturning track 412 enables the carrier 2 to switch between the horizontal position and the vertical position in the fuel factory. The RX side overturning track 432 enables the carrier 2 to switch between the horizontal position and the vertical position in the reactor factory. When the carrier 2 is overturned to the vertical state, the carrier 2 is in contact with the RX upper limiting beam 43231 and the RX lower limiting beam 43232 to stop, realizing mechanical limiting stop of the transfer trolley 1. The transfer trolley 1 is mechanically limited without sensors, low cost and high reliability, which can effectively avoid the risk of damage to the fuel assembly caused by the transfer trolley 1 exceeding the limit. The carrier 2 is overturned to a simply supported structure, which is more reliable than a single-axis structure, and the fuel assembly can avoid the risk of falling.

[0158] During the unloading process, the fuel assemblies are transported from the RX side to the KX side, the transfer trolley 1 and the carrier 2 are stored in the fuel building, and the carrier 2 is in a vertical state. When the transfer trolley 1 moves towards the reactor building, the guide wheels 23 of the carrier 2 move downwards along the KX side arc-shaped rail 4121, the carrier 2 is flipped with the hinged shaft 25 as the center until it is flipped to a horizontal state, at this time, the guide wheels 23 of the carrier 2 are separated from the KX side arc-shaped rail 4121. Then the transfer trolley 1 carrying the carrier 2 continues to pass through the transfer channel 42 to the reactor building. The rail changing mechanism 44 is triggered, the swing rail 43212 of the RX side flip rail 432 is lowered, and the transfer trolley 1 stops after being positioned.

[0159] The transfer trolley 1 carrying the carrier 2 walks towards the fuel building, the guide wheels 23 of the carrier 2 enter the RX side arc-shaped rail 4321 and move upwards along the arc-shaped rail. The carrier 2 is flipped with the hinged shaft 25 as the center until it is flipped to a vertical state, and the carrier 2 is in contact with the RX side upper limiting beam 43231 and the RX side lower limiting beam 43232 to stop, and the transfer trolley 1 stops moving.

[0160] The fuel assembly is loaded into the carrier 2 by the loading and unloading machine. The transfer trolley 1 moves towards the reactor building, the guide wheels 23 of the carrier 2 move downwards along the RX side arc-shaped rail 4321, the carrier 2 is flipped with the hinged shaft 25 as the center until it is flipped to a horizontal state, and the guide wheels 23 of the carrier 2 are separated from the RX side arc-shaped rail 4321. The rail changing mechanism 44 is triggered, the swing rail 43212 of the RX side flip rail 432 is raised, and the transfer trolley 1 stops after being positioned.

[0161] The transfer trolley 1 carrying the carrier 2 and the fuel assembly moves towards the fuel building, passes through the transfer channel 42 and reaches the fuel building. The guide wheels 23 of the carrier 2 enter the KX side arc-shaped rail 4121 and move upwards along the KX side arc-shaped rail 4121. The carrier 2 is flipped with the hinged shaft 25 as the center until it is flipped to a vertical state, and the transfer trolley 1 is in contact with the limiting baffle 4114, and the transfer trolley 1 stops moving. The spent fuel pool handling machine takes out the fuel assembly in the carrier 2 and hoists it to the storage grid of the spent fuel pool for storage.

[0162] During the loading process, the fuel assembly is transported from the KX side to the RX side, and after the unloading process is completed, the carrier 2 is in a vertical state. The spent fuel pool handling machine loads the fuel assembly to be loaded into the carrier 2. The transfer trolley 1 moves towards the reactor building, the guide wheels 23 of the carrier 2 move downwards along the KX side arc-shaped rail 4121, the carrier 2 is flipped with the hinged shaft 25 as the center until it is flipped to a horizontal state, and the guide wheels 23 of the carrier 2 are separated from the KX side arc-shaped rail 4121. Then, the transfer trolley 1 carrying the carrier 2 continues to pass through the transfer channel 42 to the reactor building. The rail changing mechanism 44 is triggered, the swing rail 43212 of the RX side flip rail 432 is lowered, and the transfer trolley 1 stops after being positioned.

[0163] The transfer trolley 1 carries the carrier 2 to the fuel plant, and the guide wheel 23 of the carrier 2 enters the RX side arc rail 4321 and moves upward along the RX side arc rail 4321. The carrier 2 is flipped around the hinge shaft 25 until it is in a vertical state, and the carrier 2 is in contact with the RX side upper limiting beam 43231 and the RX side lower limiting beam 43232 to stop, and the transfer trolley 1 is in position and stops moving.

[0164] The fuel assembly to be loaded is taken out of the carrier 2 by the loading and unloading machine and hoisted to the pressure vessel. The transfer trolley 1 moves to the reactor plant, the guide wheel 23 of the carrier 2 moves downward along the RX side arc rail 4321, the carrier 2 is flipped around the hinge shaft 25 until it is in a horizontal state, the guide wheel 23 of the carrier 2 is separated from the RX side arc rail 4321, the swing rail 43212 of the RX side flip rail 432 is triggered to rise, and the transfer trolley 1 stops after being in position.

[0165] The transfer trolley 1 carries the carrier 2 to the fuel plant and passes through the transfer channel 42 to reach the fuel plant. The guide wheel 23 of the carrier 2 enters the KX side arc rail 4121 and moves upward along the KX side arc rail 4121. The carrier 2 is flipped around the hinge shaft 25 until it is in a vertical state, and the transfer trolley 1 is in contact with the limiting baffle 4114, and the transfer trolley 1 stops moving.

[0166] When loading, the carrier 2 is in a vertical position, and the lifting appliance is used to hoist the fuel assembly corresponding to the front side plate 214 of the carrier 2 to quickly descend to near the upper edge of the front side plate 214; the fuel assembly is translated into the carrier 2 from the opening of the front side plate 214 and slowly descends; when the fuel assembly is in position, the limiting plate 221 of the anti-toppling mechanism 22 is triggered to swing out to an open position, and the limiting plate 221 and the front side plate 214 jointly prevent the fuel assembly from falling out of the front opening; when the fuel assembly is loaded, the lifting appliance releases the fuel assembly and leaves. In this embodiment, when the fuel assembly is in position, the pull rod spring and the base 228 spring are compressed, the base 228 is flattened and in contact with the supporting block 227, and at the same time the base 228 pulls the upper pull rod 223 downward by pulling the lower pull rod 225, the upper pull rod 223 pulls the limiting plate 221 to swing out to the open position, and the limiting plate 221 and the front side plate 214 cooperate to prevent the fuel assembly from falling out of the front opening of the carrier 2; when the fuel assembly is loaded, the lifting appliance releases the fuel assembly and returns to the initial state.

[0167] When the fuel assembly is taken out, the carrier 2 is located in the vertical position, the lifting tool grabs the fuel assembly and slowly lifts to above the upper edge of the front side plate 214, while the limiting plate 221 of the anti-toppling mechanism 22 resets to the retracted position; the fuel assembly is horizontally moved out from the front opening; the lifting tool quickly lifts the fuel assembly away, and the fuel assembly taking-out is completed. In the embodiment, the base 228 is lifted under the action of the base 228 spring, and the lower pull rod 225 is lifted together, the pull rod spring resets, the limiting plate 221 is retracted under the action of the pull rod spring, and after the fuel assembly is horizontally moved out from the front opening of the carrier 2, the lifting tool quickly lifts the fuel assembly away.

[0168] The fuel assembly of the utility model is lowered or lifted at the outside open position of the carrier 2, and there is no object around the fuel assembly to scratch the fuel assembly, so that the fuel assembly can be quickly lowered and lifted, the fuel assembly only needs to control the speed after entering the carrier 2 to avoid scratching each side surface of the carrier 21, that is, only 3% to 5% of the full length of the fuel assembly needs to control the lowering speed to slowly lower, so that the time of lowering and lifting the fuel assembly is greatly shortened, and the problems of low efficiency of loading the fuel assembly into the carrier 2 and taking out the fuel assembly from the carrier 2 are solved; meanwhile, the fuel assembly enters the carrier 2 and is moved out from the carrier 2 in the way of translation, the moving distance is short, the time is short, and the loading and taking efficiency of the fuel assembly is effectively improved.

[0169] The utility model discloses a bearing 2 adopts simple support structure to realize the overturning, and the constraint is strong, and the single -shaft structure overturning is more reliable, and the horizontal transfer and overturning of bearing 2 are driven by a push -and -pull drive mechanism 3, make the control point of whole device be less, effectively reduced cost, higher reliability. The processing precision and debugging precision of rigid push -and -pull drive mechanism 3 to track are lower, thereby greatly reduce the processing manufacturing cost, assembly debugging cost and operation and maintenance cost, and its whole process of work has no power alternation, no jam and power failure risk, the transfer trolley 1 adopts mechanical limit stop, no sensor, low in cost, high reliability can effectively avoid the risk of fuel assembly damage of transfer trolley 1 over limit stop, and the fuel assembly is loaded, and the problem of low efficiency of fuel assembly loading into bearing 2 and taking out from bearing 2 is solved. When loading, the lifting appliance carries fuel assembly and falls to the specified height from the outside of the front opening of bearing 2, then the fuel assembly is translated into bearing 2, when the fuel assembly falls into place, the pull rod spring and the base spring are compressed, the base 228 is flattened and contacts with the support block 227, and the limit plate 221 is swung out, the lifting appliance releases the fuel assembly and leaves. When taking out, the lifting appliance grabs the fuel assembly, and the fuel assembly is lifted to a certain height, the base 228 is lifted under the action of the base spring, and the limit plate 221 is retracted under the action of the pull rod spring, the fuel assembly is horizontally moved out from the front opening of bearing 2, and finally the fuel assembly is quickly lifted away. The limit plate 221 and the front side plate 214 jointly prevent the fuel assembly from falling out of the front opening of bearing 2, and the swinging out and retraction of the limit plate 221 are realized by a passive mode, which is simple in structure and safe and reliable. The push -and -pull drive mechanism 3 is installed and fixed on the side wall of the spent fuel pool, and can provide power for the transfer trolley 1. The upper driving part 31 is installed on the bank of the spent fuel pool by bolting. The lower transmission part is installed on the side wall of the spent fuel pool by using a quick mounting structure 34. The upper and lower parts are connected by using a quick connector 33. The driving part 31 is installed above the water surface of the spent fuel pool. The underwater part is a pure mechanical transmission part 32, which has no failure risk and high reliability. The transfer trolley 1 is connected by using a quick mounting mode, and can be disassembled and assembled at a long distance by using a long rod tool. The upper and lower parts can be lifted out of the spent fuel pool, which is convenient for maintenance.

[0170] Of course, the utility model can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the utility model without departing from the spirit and essence of the utility model. However, these corresponding changes and modifications should belong to the protection scope of the claims attached to the utility model.

Claims

1. A core fuel assembly transfer device for a nuclear reactor, comprising a drive mechanism, a transfer track, a transfer trolley and a carrier, characterized in that, The transfer trolley comprises a trolley body, walking wheels and guide wheels arranged on the trolley body, one end of the trolley body is connected with the driving mechanism, and a hole for the carrier to pass through is arranged at the end of the bottom plate of the trolley body away from the driving mechanism; the walking wheels and the guide wheels are respectively mounted on the left side wall and the right side wall of the trolley body, and the transfer trolley realizes cross-rail walking along the transfer track through the walking wheels and the guide wheels; one end of the carrier is hinged to the transfer trolley and rotates around the hinge shaft. The driving mechanism is a push-pull driving mechanism, which drives the transfer trolley to walk along the transfer track; the transfer trolley drives the carrier to realize the switching of the horizontal position and the vertical position of the carrier in cooperation with the transfer track in the fuel plant and the reactor plant respectively, and completes the transfer of the fuel assembly.

2. The core fuel assembly transfer apparatus of claim 1, wherein, The transfer track comprises: The KX-side transfer track comprises a KX-side straight track and a KX-side turnover track, the KX-side straight track is located in the spent fuel pool of the fuel plant; the KX-side turnover track is arranged above the KX-side straight track and is used for realizing the turnover of the vertical position and the horizontal position of the carrier; The RX-side transfer track comprises an RX-side straight track and an RX-side turnover track, the RX-side straight track is located in the refueling pool of the reactor plant; the RX-side turnover track is arranged above the RX-side straight track and is used for realizing the turnover of the vertical position and the horizontal position of the carrier; A transfer channel is installed through the containment wall between the fuel plant and the reactor plant, an inner track is installed in the transfer channel, and both ends of the inner track are arranged corresponding to the KX-side straight track and the RX-side straight track respectively; and A track changing mechanism is installed at the bottom of the RX-side straight track corresponding to the RX-side turnover track, which is used for realizing the height switching of the entrance position of the RX-side turnover track; the bottom of the transfer trolley is provided with a contact block corresponding to the track changing mechanism.

3. The core fuel assembly transfer apparatus of claim 2, wherein, The KX-side turnover track comprises KX-side fixed frames and KX-side arc-shaped tracks, the KX-side fixed frames are symmetrically installed on both sides of the KX-side straight track, the KX-side arc-shaped tracks on both sides are connected with the KX-side fixed frames on the same side respectively, the distance between the KX-side arc-shaped tracks on both sides is matched with the carrier, and the guide wheels on both sides of the carrier run along the tracks of the KX-side arc-shaped tracks respectively, realizing the turnover of the vertical position and the horizontal position of the carrier.

4. The core fuel assembly transfer apparatus of claim 2, wherein, The RX side flip track comprises RX side fixed frames and RX side arc-shaped tracks, the RX side fixed frames are symmetrically installed on both sides of the RX side straight tracks, and the spacing of the RX side arc-shaped tracks is adapted to the carrier; the RX side arc-shaped track comprises a fixed track and a swing track, the fixed track is installed on the RX side fixed frame; the end of the fixed track is connected with the upper end of the swing track, and the bottom end of the swing track is provided with a supporting positioning block, and the RX side straight track is provided with a supporting positioning portion corresponding to the supporting positioning block; the track changing mechanism is installed at the bottom of the RX side straight track corresponding to the supporting positioning block, and the track changing mechanism is driven and controlled by the transfer trolley to switch the swing track between the lowered position and the raised position.

5. The core fuel assembly transfer apparatus of claim 4, wherein, The RX side fixed frame is provided with an upper limiting beam and / or a lower limiting beam near one side of the KX side factory building, and the two ends of the upper limiting beam and the lower limiting beam are respectively connected with the RX side fixed frame on the corresponding side.

6. The core fuel assembly transfer apparatus of claim 2, wherein, The KX side straight track and the RX side straight track respectively comprise a straight track, a plurality of supports and an adjusting foot, the straight track is installed and supported on the plurality of supports, and the bottom end of each support is provided with the adjusting foot; the connection part of the straight track and the inner track is provided with a guide port, and the RX side straight track is provided with a limiting block near the guide port; the end of the KX side straight track is provided with a limiting baffle, and the end of the RX side straight track is provided with a connecting plate.

7. The core fuel assembly transfer apparatus of claim 1, wherein, The carrier comprises: a carrier body comprising a left side plate, a right side plate, a rear side plate, a front side plate and a carrier bottom plate, the left side plate, the right side plate, the rear side plate and the front side plate are respectively connected with the carrier bottom plate and enclosed to form a rectangular box with an open top and front; a guide wheel symmetrically installed at one end of the left side plate and the right side plate near the top; a hinge shaft symmetrically installed at one end of the left side plate and the right side plate near the bottom; the carrier body is installed on the transfer trolley through the hinge shaft and can be flipped around the axis of the hinge shaft to realize the conversion between the vertical position and the horizontal position; and an anti-toppling mechanism installed on one side of the left side plate and / or the right side plate near the front opening and located at one end near the top.

8. The core fuel assembly transfer apparatus of claim 7, wherein, The anti-toppling mechanism comprises: a limiting plate symmetrically installed on the left side plate and the right side plate through a fixing block, the limiting plate has an open position and a retracted position relative to the fixing block; a transmission mechanism comprising an upper pull rod, a lower pull rod and a pull rod return member, the two ends of the upper pull rod are respectively connected with the limiting plate and the lower pull rod, and the pull rod return member is respectively connected with the upper pull rod and the lower pull rod; and a control mechanism provided on the carrier bottom plate and connected with the transmission mechanism to control the limiting plate to switch between the open position and the retracted position.

9. The core fuel assembly transfer apparatus of claim 8, wherein, The control mechanism comprises a base, a support block and a base reset member, the rear end of the base is hinged to the bearing bottom plate, the support block is installed on the bearing bottom plate corresponding to the front end of the base, the base reset member is located between the base and the bearing bottom plate, the lower end of the pull-down rod is connected with the base and drives the base to swing up and down with the base reset member as the center, the base has a pressing position and a loosening position relative to the bearing bottom plate, the limit plate switches to the open position when the base is at the pressing position, and the limit plate switches to the retracted position when the base is at the loosening position.

10. The core fuel assembly transfer apparatus of claim 2, wherein, Also included are a blind flange and a manual gate valve, the blind flange is installed at the port of the transfer channel on the side of the refueling pool of the reactor building, and the manual gate valve is installed at the other port of the transfer channel on the side of the spent fuel pool of the fuel building.

Images