Nuclear fuel assembly transport container hook locking device

Abstract

The application relates to the technical field of fuel assembly transportation devices and discloses a nuclear fuel assembly transportation container hook locking device which comprises connecting pieces fixed on a fuel assembly transportation container and arranged adjacently on the same side, a limiting piece, and a lock hook piece pivotally connected to the connecting pieces and detachably connected with the limiting piece; the limiting piece is provided with a limiting groove and a locking mechanism, the locking mechanism comprises a lock tongue; the lock hook piece is provided with a hooking part which can be inserted into the limiting groove and hooked to a movable door assembly; when the lock tongue is subjected to a preset size of thrust of the hooking part, the lock tongue exits the limiting groove; when the hooking part is inserted into a set position of the limiting groove, the lock tongue extends into the limiting groove and stops the hooking part. The application has the limiting effect on the circumferential freedom of the movable door assembly, solves the constraint problem of the movable door assembly during fuel assembly loading and unloading, improves the stability of the fuel assembly transportation container, and has the advantages of simple structure, convenient operation and easy maintenance.

Description

Technical Field

[0001] This utility model relates to the technical field of fuel assembly transport devices, and in particular to a hook locking device for a nuclear fuel assembly transport container. Background Technology

[0002] The safe transport of fuel assemblies is a prerequisite for the stable operation of nuclear power plants. During the loading and unloading of fuel assemblies, the open movable door assembly has circumferential freedom, which poses a safety hazard. Therefore, the design of fuel transport containers must consider the use of appropriate locking devices to ensure the stability of the fuel transport containers and the safe operation of loading and unloading fuel assemblies.

[0003] When the movable door assembly of the existing fuel assembly transport container is in the open state, there is a lack of a reliable locking device. Common locking devices are mostly used on transport vehicles and are often locking devices that combine rods and hooks or linkage locking devices. However, such structures can only produce a pressing effect and are difficult to restrict the circumferential degree of freedom of the movable door assembly in the open state, so they are not suitable for use on fuel assembly transport containers. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a hook locking device for a nuclear fuel assembly transport container. This device solves the safety hazard inherent in the circumferential freedom of the movable door assembly when it is open in existing fuel assembly transport containers. This application restricts the circumferential freedom of the movable door assembly, resolving the constraint problem during fuel assembly loading and unloading, improving the stability of the fuel assembly transport container, ensuring operator safety, and offering a simple structure, convenient operation, and easy maintenance.

[0005] This application provides a hook locking device for a nuclear fuel assembly transport container, comprising a connector and a limiting member fixed to the fuel assembly transport container and arranged adjacent to each other on the same side, and a locking hook pivotally connected to the connector and detachably connected to the limiting member; the limiting member is provided with a limiting groove and a locking mechanism, the locking mechanism including a locking tongue that can be movably extended into the limiting groove; the locking hook is provided with a hooking part, the hooking part being configured to be insertable into the limiting groove and hookable to a movable door assembly; wherein, the locking tongue is configured to retract from the limiting groove when subjected to a preset amount of pushing force from the hooking part; when the hooking part is inserted into a set position in the limiting groove, the locking tongue extends into the limiting groove and stops the hooking part.

[0006] In some embodiments, the limiting groove extends along a first direction, and the hook portion is inserted into or withdrawn from one end of the limiting groove; the locking mechanism further includes a receiving member fixed to the limiting member, and a receiving cavity is provided between the receiving member and the limiting member; the receiving member is provided with a first through hole communicating the receiving cavity with the external space; the limiting member is provided with a second through hole communicating the limiting groove and the receiving cavity, the second through hole and the first through hole are arranged opposite to each other in a second direction, the second direction being perpendicular to the first direction; the two ends of the locking tongue are respectively movably inserted into the first through hole and the second through hole.

[0007] In some embodiments, the latch includes a lock head, a connecting portion, and a stop portion. The lock head extends movably into or out of the limiting groove through the second through hole. One end of the connecting portion is fixedly connected to the lock head, and the other end is at least partially movably inserted into the first through hole. The stop portion is disposed on the outer periphery of the connection between the lock head and the connecting portion, and is received in the receiving cavity. The stop portion is configured to abut against the limiting member to limit the depth of the lock head extending into the limiting groove.

[0008] In some embodiments, the lock head is a columnar structure, and the outer end of the lock head extending into the limiting groove is provided with a tapered chamfer. The tapered chamfer is configured to guide the lock tongue to retract in the second direction when subjected to a thrust from the hook portion in the first direction.

[0009] In some embodiments, the locking mechanism further includes a compression spring, which is received in the receiving cavity and sleeved on the connecting portion. One end of the compression spring elastically abuts against the stop portion, and the other end of the compression spring elastically abuts against the receiving member. The compression spring is configured to automatically drive the lock head through the second through hole into the limiting groove under normal conditions.

[0010] In some embodiments, the latch further includes an unlocking part, which is fixedly connected to the connecting part and exposed in the receiving cavity; the unlocking part is configured to overcome the elastic force of the compression spring and drive the lock head back when subjected to a pulling force in the second direction.

[0011] In some embodiments, the connector is a U-shaped structure, and the open end of the connector is fixed to the beam of the fuel assembly transport container in an end-face fixed manner; the locking hook has a connecting ring at one end facing away from the hook portion, and the connecting ring is movably sleeved on the connecting portion; the locking hook is configured to swing around the connector with the connecting ring as the pivot center.

[0012] In some embodiments, the locking hook further includes a connecting rod, with the connecting ring and the hook portion respectively fixedly connected at both ends. The connecting rod is configured to stop against the limiting member when the hook portion is inserted into the limiting groove at a set position, thereby limiting the depth of the hook portion inserted into the limiting groove.

[0013] In some embodiments, the hook part is a U-shaped structure, and the hook part uses its outer and inner surfaces of the arc-shaped closed end to movably push the locking tongue; wherein, when the hook part is inserted into the set position of the limiting groove, the locking tongue is stopped by the inner surface.

[0014] In some embodiments, in use, the locking hook is separated from the limiting member, the locking hook rotates about the connecting ring as the pivot center around the connecting member until the hook portion hooks onto the handle of the movable door assembly, and the connecting rod is rotated to be perpendicular to or substantially perpendicular to the beam of the fuel assembly transport container.

[0015] The nuclear fuel assembly transport container hook locking device provided in this application has a hook pivotally connected to a connector. In use, the hook part on the hook can rotate around the connector to engage with the open movable door assembly, which restricts the circumferential freedom of the movable door assembly. This solves the problem of lack of constraint on the movable door assembly during fuel assembly loading and unloading, effectively improves the stability of the new fuel assembly transport container, and ensures the safety of operators.

[0016] Furthermore, the nuclear fuel assembly transport container hook locking device provided in this application allows the hook part of the hook to be inserted into the limiting groove of the limiting member from one end when not in use. After the hook part is inserted into the set position of the limiting groove, the locking tongue of the locking mechanism extends into the limiting groove and stops the hook part, thereby locking and limiting the hook part and preventing problems such as the hook part shaking or the hook part colliding with the fuel assembly transport container due to lack of restraint when not in use.

[0017] Furthermore, the nuclear fuel assembly transport container hook locking device provided in this application can automatically retract the locking tongue by relying solely on the sufficient pushing force applied by the hook part during the insertion or extraction of the limiting groove, so as to avoid the hook part and allow it to be smoothly inserted or extracted from the limiting groove. After the hook part is inserted into place, the locking tongue automatically extends and forms a stop on the hook part to lock and limit the hook part on the limiting member, which significantly improves the ease of operation of locking and limiting the hook part on the limiting member. Moreover, the overall structure of the hook locking device is simple, easy to operate, and easy to maintain. Attached Figure Description

[0018] The technical solution of this application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the hook locking device of this application;

[0020] Figure 2 This is a partial cross-sectional view of one embodiment of the hook locking device of this application, wherein the locking head of the locking tongue is provided with a beveled surface, and the locking tongue includes an unlocking part;

[0021] Figure 3 This is a partial cross-sectional view of one embodiment of the hook locking device of this application, wherein the locking head of the locking tongue is provided with a tapered chamfer, and the locking tongue does not include an unlocking part;

[0022] Figure 4 This is a structural diagram of one embodiment of the hook locking device of this application in its usage state.

[0023] The reference numerals in the attached drawings are as follows: 100-fuel assembly transport container, 101-beam and column, 200-movable door assembly, 201-handle, 1-connector, 2-limiting component, 21-limiting groove, 22-fixed panel, 221-second through hole, 23-side wall panel, 24-fixed flange, 3-lock tongue, 31-lock head, 311-beveled surface, 312-conical chamfer, 32-connecting part, 33-stop part, 34-unlocking part, 4-storage component, 41-storage cavity, 42-first through hole, 5-compression spring, 6-lock hook, 61-connecting ring, 62-connecting rod, 63-hook part. Detailed Implementation

[0024] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the technical solutions of this utility model will be further described in detail below through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] To facilitate understanding of the technical content of this application, the first direction is defined as the Z-axis and the second direction is defined as the X-axis. The Z-axis is taken as the vertical direction and the X-axis is taken as the horizontal direction.

[0026] Please see Figures 1 to 4 In some embodiments of this application, a hook locking device for a nuclear fuel assembly transport container is provided. This hook locking device includes a beam 101 fixed to the fuel assembly transport container 100 (e.g., ...). Figure 4The connector 1, the limiting member 2, and the locking hook 6 are pivotally connected to the connector 1 and detachably connected to the limiting member 2, and are arranged adjacent to each other on the same side. The limiting member 2 is provided with a limiting groove 21 and a locking mechanism (not labeled), and the locking mechanism includes a locking tongue 3 that can be movably extended into the limiting groove 21.

[0027] The locking hook 6 is provided with a hooking part 63, which is configured to be inserted into the limiting groove 21 (e.g. Figures 1 to 3 (as shown), a hook 201 that can be attached to the movable door assembly 200 (such as...) Figure 4 (As shown in the diagram). Specifically, the end of the locking hook 6 facing away from the hook portion 63 is pivotally connected to the connector 1 so that the locking hook 6 can swing around the connector 1, thereby allowing the hook portion 63 at the other end of the locking hook 6 to be inserted into the limiting groove 21 on the limiting member 2 in the non-use state; or allowing the hook portion at the other end of the locking hook 6 to be hooked onto the handle 201 on the movable door assembly 200 in the use state.

[0028] The locking tongue 3 is configured to retract from the limiting groove 21 when subjected to a preset amount of thrust from the hook part 63, thus preventing the hook part 63 from smoothly inserting into or withdrawing from the limiting groove 21. When the hook part 63 is inserted into the limiting groove 21 at a predetermined position, i.e., when the hook part 63 is fully inserted, the locking tongue 3 extends into the limiting groove 21 and stops the hook part 63, thereby locking and limiting the hook part 63, achieving the connection between the locking hook 6 and the limiting member 1, and preventing the hook part 63 from easily detaching from the limiting groove 21. When the hook part 63 is inserted into or withdrawn from the limiting groove 21, an external force of not less than a preset amount must be applied to the hook part 63 to enable the hook part 63 to exert a sufficient amount of thrust on the locking tongue 3 and drive the locking tongue 3 back, thus avoiding the problem of the hook part 63 easily detaching from the limiting groove 21 due to shaking or other external forces when not in use.

[0029] The nuclear fuel assembly transport container hook locking device provided in this application has a hook 6 pivotally connected to a connector 1. In use, the hook portion 63 on the hook 6 can rotate around the connector 1 to engage with the open movable door assembly 200, thereby restricting the circumferential freedom of the movable door assembly 200. This solves the problem of lack of constraint on the movable door assembly 200 during fuel assembly loading and unloading, effectively improving the stability of the new fuel assembly transport container and ensuring the safety of operators.

[0030] Furthermore, in the non-use state, the hook part 63 of the hook member 6 can be inserted into the limiting groove 21 of the limiting member 2 from one end, and the hook part 63 is inserted into the set position of the limiting groove 21. That is, after the hook part 63 is inserted into the limiting groove 21, the locking tongue 3 of the locking mechanism extends into the limiting groove 21 and stops the hook part 63, thereby locking and limiting the hook member 6 and preventing the hook member 6 from shaking or colliding with the fuel assembly transport container 100 due to lack of restraint in the non-use state.

[0031] Furthermore, the nuclear fuel assembly transport container hook locking device provided in this application can automatically retract the locking tongue 3 by relying solely on the sufficiently large pushing force applied by the hook part 63 during the insertion or extraction of the limiting groove 21, so as to avoid the hook part 63 and allow it to smoothly insert or extract the limiting groove 21. After the hook part 63 is inserted into place, the locking tongue 3 extends and forms a stop against the hook part 63 to lock and limit the hook 6 on the limiting member 2, which significantly improves the ease of operation of locking and limiting the hook 6 on the limiting member 2. Moreover, the overall structure of the hook locking device is simple, easy to operate, and easy to maintain.

[0032] Please see Figure 4 In some embodiments, the beams 101 of the fuel assembly transport container 100 extend horizontally along the Y-axis, and the connector 1 and the limiting member 2 are fixed to the outer wall of the beams 101 of the fuel assembly transport container 100, and the connector 1 and the limiting member 2 are arranged adjacent to each other on the same side along the Y-axis.

[0033] Please see Figure 1 The limiting groove 21 can be configured to extend along a first direction, and the hook portion 63 is configured to be inserted into or withdrawn from one end of the limiting groove 21. In this embodiment, the first direction is described using the Z-axis as an example. The Z-axis is consistent with the direction of gravity and is perpendicular to the Y-axis. The upper and lower ends of the limiting groove 21 have openings that communicate with the external space. The hook portion 63 can be inserted into or withdrawn from the limiting groove 21 through the upper opening, or it can be inserted into or withdrawn from the limiting groove 21 through the lower opening. This application does not limit this.

[0034] When the limiting member 2 and the locking mechanism lock the limiting hook member 6, one end of the hook member 6 pivots around the connecting member 1, causing the hook portion 63 at the other end of the hook member 6 to move in an approximately circular motion. This allows the hook portion 63 to be inserted into or withdrawn from the limiting groove 21 through the opening at the upper or lower end. In this embodiment, the example of the hook portion 63 being inserted into or withdrawn from the limiting groove 21 from the upper end is used for explanation.

[0035] Please see Figure 3In some embodiments, the locking mechanism further includes a receiving member 4 fixed to the limiting member 2, and a receiving cavity 41 is provided between the receiving member 4 and the limiting member 2. The receiving member 4 is provided with a first through hole 42 connecting the receiving cavity 41 and the external space.

[0036] The limiting member 2 is provided with a second through hole 221 connecting the limiting groove 21 and the receiving cavity 41. The second through hole 221 and the first through hole 42 are arranged opposite to each other in a second direction, which is perpendicular to the first direction. The two ends of the locking tongue 3 are respectively movably inserted into the first through hole 42 and the second through hole 221. In this embodiment, the second direction is described using the X-axis as an example. The X-axis is horizontal and perpendicular to the Y-axis and Z-axis. The first through hole 42 and the second through hole 221 define the direction of extension and retraction of the locking tongue 3, so that the front end of the locking tongue 3 towards the limiting groove 21 can extend into or out of the limiting groove 21 in the second direction, i.e., the X-axis.

[0037] When the hook part 63 is inserted into or withdrawn from the limiting groove 21 along the first direction (i.e., the Z-axis, which will not be described in detail below), the locking tongue 3 will automatically withdraw from the limiting groove 21 along the second direction (i.e., the X-axis, which will not be described in detail below) under the guidance of the first through hole 42 and the second through hole 221 when it is not in use. This avoids the hook part 63 and allows the hook part 63 to be smoothly inserted into or withdrawn from the limiting groove 21.

[0038] Please see Figures 1 to 3 In some embodiments, the limiting member 2 can be configured as a structure similar to a channel steel, and the limiting member 2 includes a fixing panel 22 parallel to the outer wall surface of the beam-column 101 (e.g., Figures 2 to 3 As shown), the side wall panels 23 are respectively vertically connected to the two sides of the fixed panel 22. Figures 2 to 3 As shown), and the fixed flanges 24 (as shown) that are perpendicularly connected to the ends of the side wall panel 23 away from the fixed panel 22. Figure 1 As shown in the diagram, the fixed fold 24 can be folded inward or outward from the side wall panel 23, and this application does not limit this. The fixed fold 24 of the limiting member 2 is connected to the outer wall surface of the beam and column 101 by end face welding, so that the limiting groove 21 is defined between the inner wall surface of the fixed panel 22, the inner wall surface of the two side wall panels 23 and the outer wall surface of the beam and column 101.

[0039] The locking tongue 3 can be configured as a slanted tongue, a square tongue, a cylindrical tongue, etc., and this application does not limit it. During the process of the hook part 63 being inserted into or withdrawn from the limiting groove 21, the locking tongue 3 is subjected to an upward or downward pushing force along the Z-axis from the hook part 63. This pushing force will generate a component force in the axial direction of the locking tongue 3, that is, in the X-axis direction. Under the action of this component force in the X-axis direction, the locking tongue 3 is driven to retract in the second direction and avoid the hook part 63.

[0040] Please see Figures 2 to 3 In some embodiments, the storage component 4 can be configured as a cylindrical structure with one end open and the other end closed, and the first through hole 42 is disposed in the middle of the closed end of the storage component 4. The storage component 4 can be welded and fixed to the outer wall of the fixing panel 22 of the limiting component 2 at its open end, and the first through hole 42 and the second through hole 221 are arranged in a front-to-back correspondence in the X-axis direction.

[0041] The diameter and shape of the first through hole 42 and the second through hole 221 can be the same or different. This application does not limit this. As long as the first through hole 42 and the second through hole 221 can limit the reciprocating movement of the locking tongue 3 along the X-axis and allow the front end of the locking tongue 3 to extend into or exit the limiting groove 21.

[0042] Please see Figures 2 to 3 In some embodiments, the latch 3 includes a lock head 31, a connecting part 32, and a stop part 33, wherein the lock head 31 is located at the front end of the latch 3 and extends into or out of the limiting groove 21 through the second through hole 221.

[0043] The connecting part 32 is a rod-shaped structure. The front end of the connecting part 32 facing the limiting groove 21 is fixedly connected to the lock head 31, and the rear end of the connecting part 32 facing away from the lock head 31 is at least partially movably inserted into the first through hole 42.

[0044] The stop portion 33 is provided on the outer periphery of the connection between the lock head 31 and the connecting portion 32. The stop portion 33 is housed in the receiving cavity 41. The stop portion 33 is configured to abut against the outer wall surface of the fixing panel 22 of the limiting member 2 to limit the depth of the lock head 31 extending into the limiting groove 21.

[0045] The stop part 33 can be configured as an annular structure, with the outer diameter of the stop part 33 being larger than the inner diameter of the second through hole 221, so that the front end face of the stop part 33 can abut against the outer end face of the fixed panel 22 on the outer periphery of the second through hole 221, thereby stopping and limiting the lock tongue 3 and preventing the lock head 31 from extending excessively into the limiting groove 21.

[0046] In addition, the outer diameter of the stop part 33 can be set to be larger than the inner diameter of the first through hole 42, so that the rear end face of the stop part 33 can abut against the inner wall surface of the closed end of the storage member 4, preventing the locking tongue 3 from disengaging from the storage member 4 through the first through hole 42.

[0047] The lock head 31 and the connecting part 32 can be configured as a columnar structure with the same outer diameter, and the stop part 33 is coaxially fixed to the outer periphery of the connection between the lock head 31 and the connecting part 32.

[0048] Please see Figures 2 to 3In some embodiments, the locking mechanism further includes a compression spring 5, which is housed in the receiving cavity 41 and sleeved on the connecting portion 32. The compression spring 5 elastically abuts against the rear end face of the stop portion 33 facing the front end of the lock head 31, and elastically abuts against the inner wall surface of the closed end of the receiving member 4 facing away from the rear end of the lock head 31. The compression spring 5 is configured to automatically drive the lock head 31 through the second through hole 221 into the limiting groove 21 under normal conditions.

[0049] During the insertion of the hook portion 63 of the lock hook 6 into the limiting groove 21 from the upper or lower opening, a downward or upward pushing force is applied to the lock head 31. Due to its special shape design, when the lock head 31 is subjected to the downward or upward pushing force from the hook portion 63, a component force is generated in the axial direction (X-axis) of the lock tongue 3. When this component force is greater than the elastic force of the compression spring 5, it can drive the lock tongue 3 to automatically retract along the X-axis to avoid the hook portion 63. After the hook portion 63 is inserted into place, it disengages from the lock head 31. At this time, the lock head 31 is not subjected to the pushing force from the Z-axis. Under the elastic force of the compression spring 5, the lock head 31 automatically and elastically extends into the limiting groove 21 along the X-axis, thereby forming a stop for the hook portion 63.

[0050] This application uses the compression spring 5 of the locking mechanism to enable the locking tongue 3 to adaptively and elastically extend into or retract from the limiting groove 21, which further improves the ease of operation of the hook part 63 inserting into or retracting from the limiting groove 21. It also has a simple structure, is easy to operate and maintain.

[0051] Please see Figure 2 In some embodiments, when the lock head 31 is configured as a beveled tongue structure, the upper end face of the lock head 31 facing the insertion direction of the hook part 63 is configured as a beveled surface 311, and the lower end face of the lock head 31 facing the withdrawal direction of the hook part 63 is configured as a plane. During the process of the hook part 63 being inserted downward into the limiting groove 21 from the upper opening, the hook part 63 applies a downward pushing force along the first direction to the beveled surface 311 of the lock head 31. This pushing force will generate a component force along the X-axis on the beveled surface 311, and then drive the lock tongue 3 to retract along the second direction through this component force.

[0052] After the hook part 63 is inserted into place, the lock head 31 disengages from the hook part 63. Under the elastic force of the compression spring 5, the lock head 31 automatically extends into the limiting groove and forms a stop on the hook part 63. Since the lower end face of the lock head 31 is set as a plane, when the hook part 63 moves upward in the first direction, no component force along the X-axis is generated on the lower end face of the lock head 31, and it cannot drive the bolt 3 to retract in the second direction.

[0053] Please see Figure 2To allow the hook portion 63 to smoothly extend upward from the limiting groove 21 in the first direction, the latch 3 also includes an unlocking portion 34. The unlocking portion 34 is fixedly connected to the connecting portion 32 and movably inserted into the outer end of the first through hole 42, and the unlocking portion 34 is exposed in the receiving cavity 41. The unlocking portion 34 is configured to overcome the elastic force of the compression spring 5 and drive the lock head 31 to retract when subjected to a pulling force in the second direction, i.e., the X-axis.

[0054] The unlocking part 34 is located outside the storage cavity 41, making it easy for the operator to pull it by hand. When the operator applies a pulling force along the X-axis to the unlocking part 34 that is greater than the elastic force of the compression spring 5, the lock head 31 can be pulled backward by the unlocking part 34, thereby causing the lock head 31 to exit the limiting groove 21 in the second direction, thus releasing the lock head 31 from the stop of the hook part 63. This makes it convenient for the operator to swing the lock hook 6 around the pivot center until the hook part 63 is pulled upward out of the limiting groove 21. The structure is simple, the unlocking operation is convenient, and it is easy to use.

[0055] The locking head 31 of the locking tongue 3 will only retract in the second direction when the operator pulls the unlocking part 34. This structural design can prevent the hook part 63 from easily disengaging from the limiting groove 21 due to shaking or other accidents, which significantly improves the reliability of the locking mechanism in locking and limiting the hook part 63.

[0056] Please see Figure 3 In some embodiments, the lock head 31 is a columnar structure, and the outer end of the lock head 31 extending into the limiting groove 21 is provided with a tapered chamfer 312. The tapered chamfer 312 is configured to guide the lock tongue 3 to retract in the second direction when subjected to a pushing force from the hook part 63 in the first direction.

[0057] When the outer end of the lock head 31 extending into the limiting groove 21 is set with a tapered chamfer 312, since the tapered chamfer 312 is set around the entire circumference of the outer end of the lock head 31, regardless of whether the hook part 63 is inserted into or withdrawn from the limiting groove 21 from one end, the pushing force applied by the hook part 63 to the tapered chamfer 312 will generate a component force in the axial direction of the latch 3. When the operator applies a sufficiently large downward pressure or lifting force to the hook part 63, the latch 3 can automatically retract under the pushing force of the hook part 63 and overcome the elastic force of the compression spring 5, realizing the adaptive telescopic movement of the lock head 31, simplifying the structure of the latch 3, and making the operation more convenient.

[0058] Please see Figure 1 and Figure 4In some embodiments, the connector 1 is a U-shaped structure, and the open end of the U-shaped connector 1 is fixedly connected to the outer wall of the beam-column 101 of the fuel assembly transport container 100 by end-face welding. The connector 1 can be welded and fixed to the beam-column 101 in a vertical orientation (i.e., the two end faces of the open end of the connector 1 are arranged vertically upwards and downwards) or a near-vertical orientation, or it can be welded and fixed to the beam-column 101 in a horizontal orientation (i.e., the two end faces of the open end of the connector 1 are arranged horizontally to the left and right) or a near-horizontal orientation. This application does not limit this. In this embodiment, the connector 1 is welded and fixed in a vertical orientation as an example.

[0059] Correspondingly, the locking hook 6 has a connecting ring 61 at one end facing away from the hooking part 63. The connecting ring 61 is movably sleeved on the connecting part 32, allowing the locking hook 6 to pivot around the U-shaped connecting part 1 via the connecting ring 61. The locking hook 6 is configured to swing around the connecting part 1 with the connecting ring 61 as the pivot center. When the connecting ring 61 moves to the upper or lower region of the open end of the connecting part 1, the locking hook 6 can swing around the second direction, i.e., the X-axis, with the connecting ring 61 as the pivot center; when the connecting ring 61 moves to the closed end region of the connecting part 1, the locking hook 6 can swing around the first direction, i.e., the Z-axis, with the connecting ring 61 as the pivot center. This allows the locking hook 6 to swing around different axes with the connecting ring 61 as the pivot center, significantly improving the swing flexibility of the locking hook 6.

[0060] Please see Figure 1 and Figure 4 In some embodiments, the locking hook 6 further includes a connecting rod 62, which is a rod-shaped structure. The two ends of the connecting rod 62 are respectively fixedly connected to the connecting ring 61 and the hook part 63. The connecting rod 62 is configured to stop at the limiting member 2 when the hook part 63 is inserted into the limiting groove 21 at a set position, so as to limit the depth of the hook part 63 inserted into the limiting groove 21.

[0061] Please see Figure 1 and Figure 4 In some embodiments, the hook portion 63 can also be configured as a U-shaped structure. During the process of inserting or withdrawing the hook portion 63 into the limiting groove 21, the hook portion 63 uses its outer and inner surfaces of the arc-shaped closed end to actively push the lock head 31 of the latch 3. The outer surface refers to the outer wall surface of the arc-shaped closed end of the hook portion 63, and the inner surface refers to the inner wall surface of the arc-shaped closed end of the hook portion 63. The outer surface and the inner surface together constitute the outer peripheral surface of the arc-shaped closed end of the hook portion 63.

[0062] When the hook part 63 is inserted into the set position of the limiting groove 21, that is, when the hook part 63 is inserted into the final position, the lock head 31 of the latch 3 stops against the inner surface of the hook part 63. That is, during the process of the hook part 63 being inserted into the limiting groove 21, the outer surface of its arc-shaped closed end pushes against the lock head 31 of the latch 3; after the hook part 63 is inserted into the final position, the lock head 31 forms a stopping effect on the hook part 63 from the inside of the U-shaped structure; during the process of the hook part 63 being pulled out of the limiting groove 21, the inner surface of its arc-shaped closed end pushes against the lock head 31 of the latch 3.

[0063] Please see Figure 1 and Figure 3 In non-use mode, the operator can lift the connecting ring 61 of the locking hook 6 upwards, moving the connecting ring 61 to the upper area of ​​the open end of the U-shaped connecting member 1. Then, the locking hook 6 is driven to swing around the connecting ring 61 as the pivot center in the second direction until the hook part 63 inserts into the limiting groove 21 from the upper opening. During the insertion of the hook part 63 into the limiting groove 21, its outer surface of the arc-shaped closed end pushes the locking head 31 downwards and causes it to retract until the connecting rod 62 stops at the limiting member 2, so that the hook part 63 is inserted into place.

[0064] After the hook part 63 is inserted into place, the locking head 31 of the locking tongue 3 automatically and elastically extends into the limiting groove 21 through the second through hole 221 under the elastic force of the compression spring 5, and the locking head 31 stops on the inner surface of the arc-shaped closed end of the hook part 63 to prevent the hook part 63 from easily disengaging from the limiting groove 21 in the first direction, thereby realizing the locking and limiting of the lock hook 6.

[0065] In operation, the movable door assembly 200 is in the open position. The operator first needs to separate the hook 6 from the limiting member 2. Specifically, the operator can hold the connecting rod 62 of the hook 6 and apply a sufficiently large pulling force to drive the hook portion 63 upwards. During this process, the hook 6 swings around the connecting ring 61 in a second direction, causing the hook portion 63 to form an approximately circular motion around the second direction. Because the outer end of the lock head 31 of the latch 3 has a tapered chamfer 312, during the upward lifting of the hook portion 63, the inner surface of its arc-shaped closed end acts on the lock head 31 and generates a component force along the second direction. Under the action of this component force in the second direction, the latch 3 overcomes the elastic force of the compression spring 5 and automatically retracts, allowing the hook portion 63 to be pulled out of the limiting groove 21, thereby separating the hook 6 from the limiting member 2.

[0066] Then, the operator drives the locking hook 6 to move, causing the connecting ring 61 to move to the closed end region of the U-shaped connecting member 1. This causes the locking hook 6 to swing about the connecting ring 61 as a pivot center in the first direction until it hooks onto the handle 201 on the movable door assembly 200 via the hook part 63. The connecting rod 62 is then rotated to be perpendicular to or approximately perpendicular to the beam 101 of the fuel assembly transport container 100. After the locking hook 6 is hooked onto the handle 201 via the hook part 63, the connecting ring 61 is restricted to rotating about the closed end region of the connecting member 1 in the first direction. Since the locking hook 6 is a rigid structure, it effectively restricts the circumferential freedom of the movable door assembly 200 when it is open.

[0067] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A hook locking device for a nuclear fuel assembly transport container, characterized in that, The device includes a connector and a limiting member fixed to the fuel assembly transport container and arranged adjacent to each other on the same side, and a locking hook pivotally connected to the connector and detachably connected to the limiting member; the limiting member is provided with a limiting groove and a locking mechanism, the locking mechanism including a locking tongue that can be movably extended into the limiting groove; the locking hook is provided with a hooking part, the hooking part being configured to be insertable into the limiting groove and hookable to a movable door assembly; Wherein, the locking tongue is configured to retract from the limiting groove when subjected to a preset amount of thrust from the hook part; when the hook part is inserted into a set position of the limiting groove, the locking tongue extends into the limiting groove and stops the hook part.

2. The nuclear fuel assembly transport container hook locking device according to claim 1, characterized in that, The limiting groove extends along the first direction, and the hook part is inserted into or pulled out from one end of the limiting groove; The locking mechanism further includes a storage component fixed to the limiting member, and a storage cavity is provided between the storage component and the limiting member; the storage component is provided with a first through hole communicating the storage cavity with the external space; The limiting member is provided with a second through hole connecting the limiting groove and the receiving cavity. The second through hole and the first through hole are arranged opposite to each other in a second direction, which is perpendicular to the first direction. The two ends of the locking tongue are respectively movably inserted into the first through hole and the second through hole.

3. The nuclear fuel assembly transport container hook locking device according to claim 2, characterized in that, The latch includes a lock head, a connecting portion, and a stop portion. The lock head extends movably into or out of the limiting groove through the second through hole. One end of the connecting portion is fixedly connected to the lock head, and the other end is at least partially movably inserted into the first through hole. The stop portion is disposed on the outer periphery of the connection between the lock head and the connecting portion. The stop portion is received in the receiving cavity and is configured to abut against the limiting member to limit the depth of the lock head extending into the limiting groove.

4. The nuclear fuel assembly transport container hook locking device according to claim 3, characterized in that, The lock head has a columnar structure, and the outer end of the lock head that extends into the limiting groove is provided with a tapered chamfer. The tapered chamfer is configured to guide the lock tongue to retract in the second direction when it is subjected to a thrust from the hook part in the first direction.

5. The nuclear fuel assembly transport container hook locking device according to claim 3, characterized in that, The locking mechanism further includes a compression spring, which is housed in the storage cavity and sleeved on the connecting portion. One end of the compression spring elastically abuts against the stop portion, and the other end of the compression spring elastically abuts against the storage component. The compression spring is configured to automatically drive the lock head through the second through hole into the limiting groove under normal conditions.

6. The nuclear fuel assembly transport container hook locking device according to claim 5, characterized in that, The latch also includes an unlocking part, which is fixedly connected to the connecting part and exposed in the receiving cavity; the unlocking part is configured to overcome the elastic force of the compression spring and drive the lock head back when subjected to a pulling force along the second direction.

7. The nuclear fuel assembly transport container hook locking device according to any one of claims 3-6, characterized in that, The connector is a U-shaped structure, and the open end of the connector is fixed to the beam of the fuel assembly transport container by means of end face fixation. The locking hook is provided with a connecting ring at one end facing away from the hook portion, and the connecting ring is movably sleeved on the connecting portion; the locking hook is configured to swing around the connecting member with the connecting ring as the pivot center.

8. The nuclear fuel assembly transport container hook locking device according to claim 7, characterized in that, The locking hook also includes a connecting rod, with the connecting ring and the hook portion fixedly connected to its two ends respectively. The connecting rod is configured to stop against the limiting member when the hook portion is inserted into the limiting groove at a set position, thereby limiting the depth of the hook portion inserted into the limiting groove.

9. The nuclear fuel assembly transport container hook locking device according to claim 8, characterized in that, The hook part has a U-shaped structure, and the hook part uses its outer and inner surfaces of the arc-shaped closed end to push against the locking tongue. When the hook part is inserted into the set position of the limiting groove, the locking tongue stops at the inner surface.

10. The nuclear fuel assembly transport container hook locking device according to claim 9, characterized in that, In use, the locking hook is separated from the limiting member, and the locking hook rotates around the connecting member with the connecting ring as the pivot center until the hooking part hooks onto the handle of the movable door assembly, and the connecting rod is rotated to be perpendicular to or substantially perpendicular to the beam of the fuel assembly transport container.

Images