Fuel assembly loading device

Abstract

The invention discloses a fuel assembly loading device which comprises a shell and a pressing assembly, the shell is provided with a containing cavity used for containing a fuel assembly and a mounting hole penetrating in the radial direction, the pressing assembly comprises a plurality of pressing units, each pressing unit comprises a pressing bolt and a pressing plate, the pressing bolts move along the mounting holes, and the pressing plates move along the mounting holes. One end of the compression bolt is located outside the shell, and the other end is connected with the pressing plate. According to the fuel assembly fixing device, the fuel assembly is placed in the containing cavity, the pressing assembly comprises the multiple pressing units, the pressing bolt drives the pressing plate to move, the pressing plate can press the fuel assembly in the radial direction of the shell through movement, and the fuel assembly is restrained in different directions to be stably arranged in the containing cavity; the fuel assembly cannot shake in the transportation process due to the radial gap, and the transportation safety of the fuel assembly is improved.

Description

Technical Field

[0001] The invention relates to the field of nuclear power, and in particular to a fuel assembly loading device. Background Art

[0002] Nuclear fuel assemblies are radioactive items. The integrity of the entire transportation system and the critical safety of the fuel assemblies must be ensured under normal transportation conditions and transportation accident conditions. Therefore, fuel assemblies are usually transported and transferred using special loading devices. In related technologies, the size of the inner cavity used to accommodate the fuel assembly in the loading device is fixed, and there is often a gap between the inner wall of the loading device and the fuel assembly, which causes the fuel assembly to shake during transportation, posing a safety hazard and failing to ensure the safety of the fuel assembly transportation. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fuel assembly loading device that can compact the fuel assembly and improve the transportation safety of the fuel assembly.

[0004] The fuel assembly loading device according to an embodiment of the present invention comprises:

[0005] The shell is provided with a receiving cavity for receiving the fuel assembly and a mounting hole penetrating in the radial direction;

[0006] A plurality of clamping assemblies are arranged at intervals along the length direction of the shell, each of the clamping assemblies includes a plurality of clamping units arranged along the circumference of the shell, the clamping unit includes a clamping bolt and a pressure plate, the pressure plate is arranged in the accommodating cavity, the clamping bolt is threadedly connected to the mounting hole and can move along the mounting hole, one end of the clamping bolt is located outside the shell, and the other end is inserted into the accommodating cavity and connected to the pressure plate.

[0007] The fuel assembly loading device according to the embodiment of the present invention has at least the following beneficial effects:

[0008] In the present invention, the fuel assembly is placed in the accommodating cavity, the clamping assembly includes a plurality of clamping units, the clamping bolt drives the pressure plate to move, and the pressure plate can clamp the fuel assembly along the radial direction of the outer shell by moving. The fuel assembly is constrained in different directions and is firmly fixed in the accommodating cavity, so that the fuel assembly will not shake during transportation due to radial gaps, thereby improving the transportation safety of the fuel assembly.

[0009] According to some embodiments of the present invention, one end of the clamping bolt inserted into the accommodating cavity is rotatably connected to the pressure plate.

[0010] According to some embodiments of the present invention, the clamping unit also includes at least one first guide portion, which is arranged on the side of the pressure plate facing away from the accommodating cavity, and the inner wall of the outer shell is provided with at least one second guide portion, and the first guide portion and the second guide portion are plugged in along the moving direction of the clamping bolt and can move relatively with the movement of the clamping bolt.

[0011] According to some embodiments of the present invention, the clamping bolt includes a connected plug-in portion and a flange, the pressure plate has an installation cavity and an opening connected to the installation cavity, the opening is arranged on the side of the pressure plate facing away from the accommodating cavity, the plug-in portion is passed through the opening, and the flange is located in the installation cavity; the clamping unit also includes a clamping pad, and the clamping pad abuts against the flange and the inner wall of the installation cavity on two opposite sides along the moving direction of the clamping bolt, and the flange abuts against the clamping pad and the inner wall of the installation cavity on two opposite sides along the moving direction of the clamping bolt.

[0012] According to some embodiments of the present invention, the pressure plate includes a pressing portion and a fastening sleeve, the fastening sleeve is connected to the side of the pressing portion facing away from the accommodating cavity and is protruded relative to the pressing portion, the installation cavity is provided inside the fastening sleeve, and the opening is provided on the side of the fastening sleeve facing away from the accommodating cavity.

[0013] According to some embodiments of the present invention, the inner wall of the shell is further provided with a support block, and the support block is provided with a recessed avoidance groove, and the avoidance groove is used for at least a part of the pressure plate to be embedded.

[0014] According to some embodiments of the present invention, the clamping unit further includes a clamping nut connected to one end of the clamping bolt located outside the housing and used to lock the clamping bolt to the housing.

[0015] According to some embodiments of the present invention, the housing includes a rotating arm and a base, at least a portion of the rotating arm is located above the base, one side of the rotating arm is circumferentially connected to the base to open or close the accommodating cavity, and the clamping unit is installed on the rotating arm.

[0016] According to some embodiments of the present invention, the clamping assembly further comprises a plurality of support units distributed along the circumference of the shell, the support units are mounted on the base, and each of the clamping units is arranged opposite to a support unit along the direction of movement of the clamping bolt.

[0017] According to some embodiments of the present invention, the fuel assembly loading device also includes a support frame, the outer shell is provided with two and is located on opposite sides of the support frame, the rotating arm has a rotating side and a locking side, the rotating side is rotatably connected to the base, the locking side can be locked to the support frame or detached from the support frame, and the locking side is located above the rotating side.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0020] Figure 1 A schematic diagram of an embodiment of a fuel assembly loading device of the present invention;

[0021] Figure 2 for Figure 1 A cross-sectional view of an embodiment of a fuel assembly loading device;

[0022] Figure 3 It is a schematic diagram of the distribution of the compression unit on the housing;

[0023] Figure 4 is a schematic diagram of an embodiment of a pressing unit;

[0024] Figure 5 for Figure 2 A schematic diagram of one of the accommodating chambers in an open state;

[0025] Figure 6 for Figure 1 Schematic diagram of one of the accommodating chambers in the open state.

[0026] Reference numerals:

[0027] Shell 100, accommodating cavity 110, mounting hole 120, second guide portion 130, support block 140, avoidance groove 141, first accommodating portion 1411, second accommodating portion 1412, rotating arm 150, rotating side 151, locking side 152, base 160; fuel assembly 200; clamping assembly 300, clamping unit 310, clamping bolt 311, plug-in portion 3111, flange 3112, pressure plate 312, mounting cavity 3121, opening 3122, holding portion 3123, fastening sleeve 3124, clamping nut 313, gasket 314, first guide portion 315, clamping pad 316, liner 317, support unit 320; support frame 400. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0033] In an embodiment of the present invention, a fuel assembly loading device (hereinafter referred to as loading device) is provided to accommodate and stabilize the fuel assembly 200, thereby providing a guarantee for the safe transportation of the fuel assembly 200. Figure 1 and Figure 2The loading device includes a shell 100, and a receiving cavity 110 is provided inside the shell 100. The receiving cavity 110 is used to receive the fuel assembly 200. The cross section of the receiving cavity 110 can be flexibly adjusted according to the shape of the fuel assembly 200. For example, the cross section of the receiving cavity 110 is set to a polygon, a circle, etc. When the cross section of the receiving cavity 110 is set to a polygon, the cross section of the receiving cavity 110 can be set to a rectangle, a hexagon, etc.

[0034] Reference Figure 3 and Figure 4 The loading device also includes a clamping assembly 300, which is used to apply radial compression to the fuel assembly 200 to stabilize the fuel assembly 200 in the accommodating cavity 110 and prevent the fuel assembly 200 from shaking during transportation. At least one clamping assembly 300 is arranged along the length direction of the shell 100; in the case where there is one clamping assembly 300 along the length direction of the shell 100, the clamping assembly 300 can be arranged to have a larger contact area with the fuel assembly 200 in the length direction to achieve effective clamping of the fuel assembly 200 by the clamping assembly 300; in the case where there are multiple clamping assemblies 300 along the length direction of the shell 100, the clamping assemblies 300 are spaced apart along the length direction of the shell 100, and different positions of the fuel assembly 200 along the length direction of the shell 100 are all subjected to the clamping effect of the clamping assembly 300. Through multi-position contact, the clamping force is dispersed, the contact area between the clamping assembly 300 and the fuel assembly 200 is increased, the clamping assembly 300 clamps the fuel assembly 200 more comprehensively, and the fuel assembly 200 maintains a stable position in the accommodating cavity 110. It should be noted that for the fuel assembly 200 in the form of a columnar strip, by increasing the contact area between the clamping assembly 300 and the fuel assembly 200 in the length direction, the clamping effect of the fuel assembly 200 in the length direction can be improved, making the position of the fuel assembly 200 in the accommodating cavity 110 more stable.

[0035] Each clamping assembly 300 includes a plurality of clamping units 310 arranged along the circumference of the shell 100. The clamping unit 310 includes a clamping bolt 311 and a pressure plate 312. The pressure plate 312 is arranged in the accommodating cavity 110. The shell 100 is also provided with a mounting hole 120 that penetrates in the radial direction. One end of the mounting hole 120 penetrates into the accommodating cavity 110, and the other end penetrates to the outside of the shell 100. The clamping bolt 311 is threadedly connected in the mounting hole 120. The clamping bolt 311 can move along the mounting hole 120. One end of the clamping bolt 311 is inserted into the accommodating cavity 110 and connected to the pressure plate 312, and the other end is located outside the shell 100 to facilitate operation of the clamping bolt 311.

[0036] When the clamping bolt 311 moves in the mounting hole 120, it drives the pressure plate 312 to move synchronously to change the radial position of the pressure plate 312 in the shell 100, so that the pressure plate 312 is close to or away from the fuel assembly 200 in the accommodating cavity 110. The pressure plate 312 can press the fuel assembly 200 along the radial direction of the shell 100 by moving. The fuel assembly 200 is constrained and firmly fixed in the accommodating cavity 110, so that the fuel assembly 200 will not shake during transportation due to the radial gap, thereby improving the transportation safety of the fuel assembly 200.

[0037] In addition, the fuel assembly 200 can be constrained by moving the clamping bolt 311. The structure of the clamping unit 310 is simple and easy to operate. In addition, there are multiple clamping units 310 in the circumferential direction of the shell 100. Different clamping units 310 have different clamping force directions on the fuel assembly 200. By applying clamping force to the fuel assembly 200 in multiple directions and at different positions, the fuel assembly 200 is effectively clamped, and the problem of circumferential acceleration exceeding the limit value caused by the gap is avoided. The clamping unit 310 applies clamping force to the fuel assembly 200 through the pressure plate 312. The contact area between the pressure plate 312 and the fuel assembly 200 is large, which can avoid stress concentration and prevent the pressure of the clamping unit 310 on the fuel assembly 200 from being too large, thereby damaging the fuel assembly 200. The clamping effect of the clamping unit 310 on the fuel assembly 200 is more stable.

[0038] It can be understood that the clamping bolt 311 can be moved in the mounting hole 120 by screwing the clamping bolt 311. The inner wall of the mounting hole 120 is provided with an internal thread that matches the external thread of the clamping bolt 311. Under the mutual extrusion and friction of the internal and external threads, the clamping bolt 311 can be fixed in the mounting hole 120 and maintain the clamping state of the fuel assembly 200. One end of the clamping bolt 311 is exposed to the outside of the housing 100, so that an external tool can operate the clamping bolt 311 more conveniently. Further, a nut is provided at the end of the clamping bolt 311, or a recessed hexagonal countersunk hole is provided on the end face of the clamping bolt 311 for operation by an external tool, so that the movement of the clamping bolt 311 is more convenient.

[0039] In one embodiment, the clamping unit 310 also includes a clamping nut 313, which is connected to one end of the clamping bolt 311 located outside the shell 100 and is used to lock the clamping bolt 311 to the shell 100. The clamping nut 313 is sleeved on the outside of the clamping bolt 311, and an external tool can directly screw the clamping nut 313 to move the clamping bolt 311 in the mounting hole 120; when the clamping nut 313 is tightened, the clamping nut 313 is subjected to a radial force from the outer wall of the shell 100, and the clamping nut 313 and the shell 100 abut against each other and lock, so that the clamping bolt 311 is locked in a preset position to prevent the clamping bolt 311 from loosening and affecting the clamping effect on the fuel assembly 200.

[0040] Furthermore, the clamping unit 310 further includes a gasket 314, which is sleeved on the outside of the clamping bolt 311 and is located between the outer wall of the housing 100 and the clamping nut 313. When the clamping nut 313 is locked, the gasket 314 is clamped between the outer wall of the housing 100 and the clamping nut 313. The contact area between the gasket 314 and the housing 100 is large, which can disperse the pressure and prevent the clamping nut 313 from loosening, so that the connection between the clamping bolt 311 and the housing 100 is more stable. The gasket 314 is not limited to being set as a metal gasket, a stop gasket, etc.

[0041] In one embodiment, a clamping bolt 311 is provided at one end located inside the shell 100 and is rotatably connected to a pressure plate 312, and the relative rotation direction of the two is parallel to the moving direction of the clamping bolt 311. When the clamping bolt 311 rotates in the mounting hole 120, the pressure plate 312 only moves radially following the clamping bolt 311 and can clamp the fuel assembly 200 more quickly, thereby preventing the pressure plate 312 from affecting the clamping effect of the pressure plate 312 on the fuel assembly 200 due to following the rotation of the clamping bolt 311.

[0042] Furthermore, the clamping unit 310 also includes at least one first guide portion 315, which is arranged on the side of the pressure plate 312 facing away from the accommodating chamber 110, and the inner wall of the shell 100 is provided with at least one second guide portion 130. The first guide portion 315 and the second guide portion 130 are plugged in along the movement direction of the clamping bolt 311, and can move relative to each other following the movement of the clamping bolt 311. The first guide portion 315 and the second guide portion 130 are mutually limited along the radial direction of the clamping bolt 311. During the rotation of the clamping bolt 311, the second guide portion 130 constrains the first guide portion 315 to only move along the moving direction of the clamping bolt 311, limiting the circumferential rotation of the first guide portion 315 around the pressure plate 312, so that the pressure plate 312 can only move following the movement of the clamping bolt 311 and adjust the position along the radial direction of the shell 100.

[0043] It can be understood that the connection position of the clamping bolt 311 and the pressure plate 312 is staggered from the projection position formed by the first guide portion 315 along the moving direction of the clamping bolt 311, that is, the clamping bolt 311 is connected to the center position of the pressure plate 312, and the first guide portion 315 is eccentrically arranged compared to the clamping bolt 311, so that the cooperation between the first guide portion 315 and the second guide portion 130 limits the rotation of the pressure plate 312.

[0044] In addition, the relative movement of the first guide portion 315 and the second guide portion 130 can provide guidance for the pressing plate 312 to follow the movement of the clamping bolt 311, so that the movement of the pressing plate 312 is more stable. Multiple first guide portions 315 and second guide portions 130 can be provided, and multiple first guide portions 315 and second guide portions 130 are arranged at intervals around the clamping bolt 311, so that different positions of the pressing plate 312 are guided by movement, further improving the stability of the movement of the pressing plate 312.

[0045] One of the first guide portion 315 and the second guide portion 130 is configured as a hole, and the other is configured as a column, which is inserted into the hole and can move in the hole. In one embodiment, the inner wall of the housing 100 is provided with a support block 140, which is located between the inner wall of the housing 100 and the pressure plate 312, the second guide portion 130 is configured as a guide hole, which is provided on the support block 140, the first guide portion 315 is configured as a guide column, which is provided on the side of the pressure plate 312 facing the support block 140, the extension direction of the guide hole and the guide column are parallel to the moving direction of the clamping bolt 311, and the guide column is slidably connected in the guide hole.

[0046] The guide column can be set as a protrusion protruding from the pressure plate 312 toward the support block 140, and the guide column is integrally connected to the pressure plate 312; or, a hole is preset in the pressure plate 312, the guide column is inserted into the hole, and is fixed to the pressure plate 312 by welding, bonding, etc., and one end protrudes from the surface of the pressure plate 312 toward the support block 140 compared to the pressure plate 312.

[0047] In one embodiment, the clamping bolt 311 includes a connected plug-in portion 3111 and a flange 3112, both of which are located in the accommodating cavity 110, the flange 3112 is connected to the side of the plug-in portion 3111 facing away from the inner wall of the housing 100, the width of the flange 3112 is greater than the width of the plug-in portion 3111, the pressing plate 312 has a mounting cavity 3121 and an opening 3122 connected to the mounting cavity 3121, the opening 3122 is arranged on the side of the pressing plate 312 facing away from the accommodating cavity 110, the plug-in portion 3111 is penetrated in the opening 3122, the flange 3112 is located inside the mounting cavity 3121, the width of the flange 3112 is greater than the opening of the opening 3122, so that the flange 3112 does not will fall out of the installation cavity 3121; the clamping unit 310 also includes a clamping pad 316, and the clamping pad 316 abuts against the flange 3112 and the inner wall of the installation cavity 3121 on two opposite sides along the moving direction of the clamping bolt 311, and the flange 3112 abuts against the inner wall of the installation cavity 3121 on two opposite sides along the moving direction of the clamping bolt 311, so as to eliminate the gap between the clamping bolt 311 and the pressure plate 312 in the moving direction of the clamping bolt 311, and the movement of the clamping bolt 311 can be converted into the movement of the pressure plate 312 to the maximum extent, avoiding the lag of the pressure plate 312 following the movement of the clamping bolt 311 due to the gap between the clamping bolt 311 and the pressure plate 312.

[0048] It is understandable that the pressing pad 316 can be configured as a flexible pad so that the flange 3112 is stably clamped between the pressing pad 316 and the inner wall of the mounting cavity 3121 .

[0049] Furthermore, the pressing plate 312 further includes a pressing portion 3123 and a fastening sleeve 3124. The fastening sleeve 3124 is connected to the side of the pressing portion 3123 facing away from the accommodating chamber 110 and is protruded relative to the pressing portion 3123. The installation cavity 3121 is arranged inside the fastening sleeve 3124. The opening 3122 is arranged on the side of the fastening sleeve 3124 facing away from the accommodating chamber 110. The side of the pressing portion 3123 facing the accommodating chamber 110 is used to press the fuel assembly 200. By arranging the fastening sleeve 3124 can increase the length of the pressure plate 312 in the moving direction of the clamping bolt 311, so that the installation cavity 3121 has enough space for the flange 3112 and the clamping pad 316 to be installed, and the pressure plate 312 has enough structural strength to clamp the fuel assembly 200, avoiding the structural strength of the pressure plate 312 itself being reduced due to the space provided in the pressure plate 312 for installing the flange 3112 and the clamping pad 316, thereby affecting the clamping effect of the clamping unit 310 on the fuel assembly 200.

[0050] In addition, the pressing unit 310 further includes a gasket 317, which is flexible and is disposed on the side of the pressing plate 312 facing the accommodating cavity 110, such as the gasket 317 disposed on the side of the holding portion 3123 facing the accommodating cavity 110; the gasket 317 can be fixed to the surface of the pressing plate 312 by bonding, coating, etc. By providing the gasket 317, a flexible contact between the pressing unit 310 and the fuel assembly 200 is achieved, and the friction between the pressing unit 310 and the fuel assembly 200 is increased, so as to ensure that the pressing unit 310 stably presses the fuel assembly 200 and avoid damage to the fuel assembly 200 due to hard contact.

[0051] Exemplarily, the pressure plate 312 is made of a hard material such as alloy or stainless steel, so that the pressure plate 312 has a certain structural strength and can provide a stable pressing effect on the fuel assembly 200; the gasket 317 is made of a flexible material such as rubber or silicone, so that the pressing unit 310 is in flexible contact with the fuel assembly 200, and the pressing unit 310 is more stable in pressing the fuel assembly 200.

[0052] In addition, the support block 140 is further provided with a recessed avoidance groove 141, the mounting hole 120 penetrates the avoidance groove 141, the clamping bolt 311 can be connected to the pressure plate 312 through the avoidance groove 141, the avoidance groove 141 is open to one side of the accommodating chamber 110, and the pressure plate 312 can enter and exit the avoidance groove 141. When the clamping bolt 311 drives the pressure plate 312 to move, the pressure plate 312 can enter and exit the avoidance groove 141, that is, the pressure plate 312 is opened toward the accommodating chamber 110. When the cavity 110 moves, the pressure plate 312 withdraws from the avoidance groove 141 and presses the fuel assembly 200. When the pressure plate 312 moves away from the accommodating cavity 110, at least part of the pressure plate 312 is embedded in the avoidance groove 141 to avoid the fuel assembly 200, and when the pressure plate 312 is in the retracted state, the side of the clamping assembly 300 facing the accommodating cavity 110 remains flat, so as to facilitate the cooperation and compression of the clamping assembly 300 and the fuel assembly 200.

[0053] It is understandable that in the case where a guide hole is provided on the support block 140, the guide hole is connected to the avoidance groove 141. When the pressure plate 312 moves following the clamping bolt 311, while the guide column moves along the guide hole, the pressure plate 312 can enter and exit the avoidance groove 141, thereby making the connection between the support block 140 and the pressure plate 312 more compact.

[0054] In addition, the edge of the pressing plate 312 on the side facing away from the accommodating cavity 110 is chamfered, and the open side of the avoidance groove 141 is expanded outward to facilitate the pressing plate 312 to enter and exit the avoidance groove 141. The avoidance groove 141 includes a first accommodating portion 1411 and a second accommodating portion 1412. The second accommodating portion 1412 is located in the middle of the first accommodating portion 1411 and protrudes away from the accommodating cavity 110 relative to the first accommodating portion 1411. The first accommodating portion 1411 is used to accommodate the holding portion 3123, and the second accommodating portion 1412 is used to accommodate at least part of the fastening sleeve 3124, so that different parts of the pressing plate 312 can be embedded in the avoidance groove 141.

[0055] Reference Figure 2 , Figure 5 and Figure 6 In the present invention, the shell 100 includes a rotating arm 150 and a base 160. One side of the rotating arm 150 in the circumferential direction is rotatably connected to the base 160. The accommodating chamber 110 can be opened or closed by rotating the rotating arm 150 relative to the base 160. When the accommodating chamber 110 is opened, it is in an open state, and the fuel assembly 200 can be loaded into the accommodating chamber 110 or taken out of the accommodating chamber 110 more conveniently. In addition, at least part of the rotating arm 150 is located above the base 160, and the rotating arm 150 can be rotated upward relative to the base 160 to open the accommodating chamber 110. The accommodating chamber 110 is open upward, which is convenient for the fuel assembly 200 to be loaded into the accommodating chamber 110. After the fuel assembly 200 is placed in the accommodating chamber 110, it can be supported by the base 160; the clamping unit 310 is installed on the rotating arm 150. After the accommodating chamber 110 is closed, the clamping unit 310 is adjusted to clamp the fuel assembly 200 by adjusting the clamping bolt 311. The fuel assembly 200 is firmly fixed in the accommodating chamber 110 under the support of the base 160 and the clamping action of the clamping unit 310.

[0056] It should be noted that since the clamping unit 310 is installed on the rotating arm 150, and at least the rotating arm 150 is located above the base 160 and can rotate relative to the base 160, the clamping unit 310 can be maintained by rotating the rotating arm 150 to the corresponding position, and the operation is relatively convenient; in addition, the upper end of the clamping bolt 311 is exposed to the outside of the outer shell 100, and the clamping bolt 311 is not blocked by other components, and the operation of the clamping bolt 311 is convenient.

[0057] The clamping assembly 300 also includes a plurality of support units 320 distributed along the circumference of the outer shell 100. The support units 320 are mounted on the base 160 and are located inside the outer shell 100. Each clamping unit 310 is arranged opposite to a support unit 320 along the moving direction of the clamping bolt 311, so that the fuel assembly 200 is respectively subjected to the clamping effect of the clamping unit 310 and the supporting effect of the support unit 320 on two opposite sides, and is stabilized in the accommodating cavity 110.

[0058] For example, Figure 5 and Figure 6 As shown, the cross-section of the fuel assembly 200 is hexagonal, and the clamping assembly 300 includes three clamping units 310 and a third support unit 320. Each clamping unit 310 is arranged opposite to a support unit 320, and the support unit 320 is located below the clamping unit 310. The support unit 320 supports the fuel assembly 200, and the clamping unit 310 clamps the fuel assembly 200, so that the fuel assembly 200 is constrained in multiple directions and maintains a stable position in the accommodating cavity 110.

[0059] In one embodiment, the loading device further comprises a support frame 400, two shells 100 are provided and are located on opposite sides of the support frame 400, the rotating arm 150 has a rotating side 151 and a locking side 152, the rotating side 151 is rotatably connected to the base 160, and the locking side 152 can be locked to the support frame 400, so that the accommodating chamber 110 remains in a closed state, or the locking side 152 can be separated from the support frame 400, so that the rotating arm 150 can be rotated relative to the base 160 and the accommodating chamber 110 is opened. By providing the support frame 400, the two shells 100 can be connected as an integral connection, and the locking side 152 can be locked by the support frame 400; in addition, the locking side 152 is located above the rotating side 151, so that the rotating arm 150 can be opened upward relative to the base 160, and the fuel assembly 200 can be more conveniently placed in the accommodating chamber 110 from above the base 160, or the fuel assembly 200 can be taken out.

[0060] Exemplarily, the locking side 152 can be locked to the top of the support frame 400. The top of the support frame 400 is unobstructed, so the locking side 152 can be locked or unlocked more conveniently. The locking method of the locking side 152 is not limited to that a plug hole extending along the length direction of the housing 100 is provided on the locking side 152 and the support frame 400, and a latch is provided to be inserted into the plug hole of the locking side 152 and the support frame 400 to achieve locking of the locking side 152. After the latch is removed, the locking of the locking side 152 is released, so that the rotating arm 150 can rotate relative to the base 160. The rotating side 151 is rotatably connected to the base 160 through a hinge shaft. One of the base 160 and the rotating side 151 is connected to the hinge shaft, and the other is provided with a shaft hole. The hinge shaft is inserted into the shaft hole and can rotate in the shaft hole. The rotation axis of the hinge shaft is parallel to the length direction of the housing 100.

[0061] In addition, the rotating arm 150 is arc-shaped as a whole, and the rotating side 151 of the rotating arm 150 transitions smoothly to the locking side 152 . There is no protruding part on the surface of the rotating arm 150 , which can reduce the safety hazard caused by stress concentration.

[0062] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A fuel assembly loading device, characterized in that: include: The shell is provided with a receiving cavity for receiving the fuel assembly and a mounting hole penetrating in the radial direction; A plurality of clamping assemblies are arranged at intervals along the length direction of the shell, each of the clamping assemblies includes a plurality of clamping units arranged along the circumference of the shell, the clamping unit includes a clamping bolt and a pressure plate, the pressure plate is arranged in the accommodating cavity, the clamping bolt is threadedly connected to the mounting hole and can move along the mounting hole, one end of the clamping bolt is located outside the shell, and the other end is inserted into the accommodating cavity and connected to the pressure plate.

2. The fuel assembly loading device according to claim 1, characterized in that: One end of the clamping bolt inserted into the accommodating cavity is rotatably connected to the pressing plate.

3. The fuel assembly loading device according to claim 2, characterized in that: The clamping unit also includes at least one first guide portion, which is arranged on the side of the pressure plate facing away from the accommodating cavity. The inner wall of the outer shell is provided with at least one second guide portion. The first guide portion and the second guide portion are plugged in along the moving direction of the clamping bolt and can move relatively with the movement of the clamping bolt.

4. The fuel assembly loading device according to claim 2, characterized in that: The clamping bolt includes a connected plug-in portion and a flange, the pressure plate has an installation cavity and an opening connected to the installation cavity, the opening is arranged on the side of the pressure plate facing away from the accommodating cavity, the plug-in portion is passed through the opening, and the flange is located in the installation cavity; the clamping unit also includes a clamping pad, and the clamping pad is respectively abutted against the flange and the inner wall of the installation cavity on two opposite sides along the moving direction of the clamping bolt, and the flange is respectively abutted against the clamping pad and the inner wall of the installation cavity on two opposite sides along the moving direction of the clamping bolt.

5. The fuel assembly loading device according to claim 4, characterized in that: The pressure plate comprises a pressing portion and a fastening sleeve, wherein the fastening sleeve is connected to a side of the pressing portion facing away from the accommodating cavity and is protruded relative to the pressing portion, the interior of the fastening sleeve is provided with the installation cavity, and the side of the fastening sleeve facing away from the accommodating cavity is provided with the opening.

6. The fuel assembly loading device according to claim 1, characterized in that: The inner wall of the shell is also provided with a support block, and the support block is provided with a recessed avoidance groove, and the avoidance groove is used for at least a part of the pressing plate to be embedded.

7. The fuel assembly loading device according to claim 1, characterized in that: The clamping unit further includes a clamping nut connected to one end of the clamping bolt located outside the housing and used for locking the clamping bolt to the housing.

8. The fuel assembly loading device according to claim 1, characterized in that: The housing includes a rotating arm and a base, at least a portion of the rotating arm is located above the base, one side of the rotating arm in the circumferential direction is rotatably connected to the base to open or close the accommodating cavity, and the clamping unit is installed on the rotating arm.

9. The fuel assembly loading device according to claim 8, characterized in that: The clamping assembly further comprises a plurality of support units distributed along the circumference of the shell, the support units being mounted on the base, and each of the clamping units being arranged opposite to a support unit along the moving direction of the clamping bolt.

10. The fuel assembly loading device according to claim 8, characterized in that: The fuel assembly loading device also includes a support frame, two of the outer shells are provided and are located on opposite sides of the support frame, the rotating arm has a rotating side and a locking side, the rotating side is rotatably connected to the base, the locking side can be locked to the support frame or detached from the support frame, and the locking side is located above the rotating side.

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