Shielding and transfer device and transport vehicle

Abstract

The application discloses a shielding and transferring device and a transport vehicle. The device comprises a shielding cover for opening / closing a shielding container for containing radioactive materials. The shielding cover is used to be coupled with a coupling seat. The shielding cover is provided with a coupling groove extending along the circumference of the shielding cover. The coupling seat is provided with one or more coupling parts engaging with the coupling groove and capable of sliding along the coupling groove in the circumferential direction. Alternatively, the shielding cover is provided with one or more coupling parts extending along the circumference of the shielding cover. The coupling seat is provided with an arc coupling groove engaging with the one or more coupling parts and allowing the one or more coupling parts to slide along the arc coupling groove in the circumferential direction. The shielding cover can be driven to rotate, or the shielding cover can be moved under the traction of the coupling seat. Compared with the prior art, the application has the advantages of convenient operation, easy automation, safety and the like.

Description

Technical Field

[0001] This invention belongs to the field of radioactive object transport equipment, specifically a shielding and transfer device and a transport vehicle. Background Technology

[0002] Unlike ordinary materials or waste, radioactive substances (hereinafter referred to as radioactive materials) require physical shielding during transportation and storage to prevent radiation damage to workers or other personnel who may come into contact with them. These radioactive materials include, but are not limited to, nuclear fuel and spent filter cartridges used in nuclear power plants.

[0003] The commonly used method of transfer is to use transfer barrels, cans or similar containers to place the radioactive material in such containers.

[0004] For example, US20030194042A1 discloses a system for transferring spent nuclear fuel from a spent nuclear fuel pool to a storage container, which specifically discloses the structure of the transfer container and a method for loading spent nuclear fuel containers using the transfer container. The transfer container is made of a radiation-absorbing material to achieve nuclear radiation shielding.

[0005] For example, in a transport container disclosed in EP0292005A2, the shield can be closed by a protective cover, and the rotating insert is locked in the transport position by the shape of the protective cover matching the shoulder, so as to facilitate transport.

[0006] Standards such as US2015206610A1, CN1115586A, and CN112313756A specify special designs for the structure of transport containers to meet corresponding transfer or storage requirements.

[0007] On the one hand, although workers can wear anti-radiation clothing to protect themselves from radiation damage, there may be potential dangers if the anti-radiation clothing is slightly damaged during operation.

[0008] Therefore, it is necessary to design new transfer devices or improve existing ones. US20210057119A1 discloses a transfer container with a rotating, closable lid at the bottom for easy transfer. To improve the convenience and safety of transfer operations, CN109411105A discloses a radioactive sample shielding and transport device, its usage method, and a matching shielding container to enhance operational convenience and shielding effectiveness. KR101885607B1 discloses a spent fuel beam transport container for safe transport.

[0009] On the other hand, although existing technologies provide various shielding containers, some operational steps during the transfer process still present inconveniences. The inventors of this invention have noted that, including but not limited to the aforementioned prior art, operations involving the opening and closing of lids of containers directly containing radioactive materials, the use of screws to secure the lid and close the container, or, as disclosed in US20180308594A1, the system and method for transferring spent nuclear fuel from wet storage to dry storage, involving the gripping of the transfer container, often require alignment of screw holes or clamping positions due to structural limitations, thus necessitating the actuation of related components to achieve alignment. Furthermore, the need for alignment is not limited to the aforementioned situations; alignment may also be required in other circumstances that cannot be exhaustively listed.

[0010] Therefore, it is necessary to design a shielding device that is safe, easy to operate, and suitable for transferring radioactive materials. Summary of the Invention

[0011] On the one hand, in order to improve the convenience and safety of radioactive material transfer, the present invention provides a shielding device with a mating structure that allows movement and rotation, thereby facilitating the opening / closing of the cover or adjusting the position of the cover.

[0012] The shielding device includes a shielding cover for opening / closing a shielding container for containing radioactive material. The shielding cover can be connected to a coupling base.

[0013] The shielding cover has a connecting groove extending circumferentially along the shielding cover, and the connecting seat has one or more connecting parts that engage with the connecting groove and can slide circumferentially along the connecting groove. Alternatively, the shielding cover has one or more connecting parts extending circumferentially along the shielding cover, and the connecting seat has an arc-shaped connecting groove that engages with the one or more connecting parts, allowing the one or more connecting parts to slide circumferentially along the arc-shaped connecting groove.

[0014] The shielding cover can be rotated by a drive, or the shielding cover can be moved under the traction of the connecting seat.

[0015] Optionally, the shielding device further includes a side shielding wall connected to the mounting base, wherein: the side shielding wall surrounds the shielding cover, and an open groove is formed between the side shielding wall and the mounting base, allowing the shielding cover to move within the open groove.

[0016] On the other hand, in order to facilitate the loading / unloading of transported radioactive materials, the present invention provides a transfer device.

[0017] The transfer device includes a support frame, characterized in that the support frame is used to support the aforementioned shielding device.

[0018] Optionally, the shielding cover is connected to the connecting seat, such that the connecting seat also constitutes a component of the shielding device / transfer device.

[0019] Optionally, the support frame is fixed together with the mounting base, or / and the support frame is fixed together with the shielding container.

[0020] On the other hand, in order to facilitate transportation, the present invention provides a transport vehicle.

[0021] The aforementioned transfer device is installed on the transport vehicle, wherein the support frame is movably placed on the transport vehicle.

[0022] Compared with the prior art, the present invention has the advantages of convenient operation, easy adjustment of the position of the shielding cover, and easy adjustment of the position of the transfer device. Furthermore, the action of opening and closing the cover can be performed automatically, or it can be performed by the operator under the shielding and shielding effect of the shielding cover, shielding container, and / or side shielding wall, which has good safety. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a shielding device according to one embodiment.

[0024] Figure 2 for Figure 1 The shielding device shown omits the exploded axial view of the shielding container.

[0025] Figure 3 for Figure 1 The shielding device shown omits a top view of the shielding container.

[0026] Figure 4 for Figure 3 A cross-sectional view along the FF direction is shown in the figure, which also shows the transfer tank.

[0027] Figure 5 This is a schematic diagram of a transfer device according to one embodiment, showing a partial cross-section.

[0028] Figure 6 This is an exploded axial view of a transfer device according to one embodiment.

[0029] Figure 7 This is an axle-side schematic diagram of a transport vehicle according to one embodiment.

[0030] Figure 8 for Figure 7 A schematic diagram of its breakdown.

[0031] Figure 9 This is an axle-side schematic diagram of the connection between the transport vehicle and the tractor in one embodiment.

[0032] Drawing number explanation:

[0033] 1. Shielding cover, 10. Circular groove, 11. Driven engagement part, 12. Robot arm, 13. Rotary device.

[0034] 20. Shielded container, 21. Transfer barrel, 22. Barrel lid, 23. Clamping part, 24. Bolt.

[0035] 3. First drive mechanism, 30. Lead screw, 31. Nut part, 32. Second drive mechanism, 33. Active engagement part, 34. Handwheel.

[0036] 4. Connecting seat, 40. Pin, 41. Notch, 42. Locking pin.

[0037] 5. Mounting base, 50. Opening, 51. Opening, 52. Guide groove, 53. First roller, 54. Second roller, 55. Side shielding wall, 56. Limiting pin hole, 57. Guide groove.

[0038] 6. Support frame, 60. Crossbeam, 61. Column, 62. Air cushion.

[0039] 7. Transport vehicle; 70. Stop block; 71. Hole and slot; 73. Traction connector. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] refer to Figure 1 As shown, the shielding device of this embodiment includes a shielding cover 1 and a shielding container 2. The shielding container 2 has a cavity in its middle for containing radioactive material, and an opening at its upper part for inserting / removing radioactive material. The shielding cover 1 can be placed over the opening of the shielding container 2 to close it. The shielding cover 1 can also be removed to open the shielding container 2. The shielding device also includes a first driving mechanism 3 to drive the shielding cover 1 to move.

[0042] In some embodiments, the first drive mechanism 3 includes a lead screw 30 and a nut portion 31 threadedly engaged with the lead screw 30. Establishing a cylindrical coordinate system with the lead screw 30 as a reference, when the nut portion 31 is limited in the circumferential direction, the rotation of the lead screw 30 will drive the nut portion 31 to move along the length direction of the lead screw 30, i.e., axially. By directly or indirectly connecting the nut portion 31 to the shielding cover 1, the shielding cover 1 can be moved by rotating the lead screw 30.

[0043] The lead screw 30 can be driven by manual rotation, thus allowing for the addition of a handwheel or similar device for ease of operation. Alternatively, the lead screw can be driven by a motor, with the motor's output shaft connected to the lead screw to drive its rotation. For easier control of the movement, the motor can also be a stepper motor or a servo motor.

[0044] In other embodiments, the first drive mechanism 3 may also be configured as an electric / hydraulic actuator, a linear motor, or other linear actuators with similar functions.

[0045] refer to Figure 1 and Figure 2 As shown, the shielding device is further provided with a connecting seat 4, which is connected to the first driving mechanism 3 and can move under the drive of the first driving mechanism 3. The connecting seat 4 has one or more pins 40, and the shielding cover 1 has a circular groove 10, into which the pins 40 can be inserted. The pins 40 and the groove wall of the circular groove 10 engage with each other in the direction of movement of the shielding cover 1 when closed or opened, thus, when the connecting seat 4 is moved, the shielding cover 1 can be pulled to move accordingly. The pins 40 and the circular groove 10 are in a movable fit, thereby allowing the shielding cover 1 to rotate. During this process, the pins 40 slide relative to each other circumferentially along the circular groove 10.

[0046] As configured above, the shielding cover 1 can be opened or closed manually or automatically using the first drive mechanism 3. When the shielding cover 1 is moved onto the shielding container 2 and closed, the radioactive material placed inside the shielding container 2 is essentially isolated from the external environment, improving the safety of subsequent operations. When the shielding cover 1 is in the closed position, if adjustment is needed to align / align specific components, the shielding cover 1 can be rotated in place while in the closed position.

[0047] The shielding cover 1 can be rotated manually or by using a second drive mechanism.

[0048] A notch 41 is provided on one side of the connecting seat 4, and the upper side of the notch 41 is a notch structure.

[0049] Preferably, the notch 41 of the connecting seat 4 is provided with a plurality of pins 40, which are arranged along a virtual arc and can be simultaneously inserted into the annular groove 10 of the shielding cover 1.

[0050] Optionally, the pin 40 on the connecting seat 4 may be rotatable, or have a rotating part such as a rotating bushing / rotating cap, to achieve rotational engagement with the annular groove 10 of the shielding cover 1.

[0051] As shown in the figure, the pin 40 is vertically upward, and the annular groove 10 opens downward, allowing them to directly abut against each other in the horizontal direction for traction engagement. In other embodiments, the pin 40 may also be upward, and correspondingly, the annular groove 10 opens upward, allowing them to directly abut against each other in the horizontal direction for traction engagement. In still other embodiments, the direction of the pin 40 and the opening direction of the annular groove 10 may be inclined, or further deformed. Optionally, a limiting structure, such as a step, may be provided between the pin 40 and the annular groove 10 to prevent the pin 40 from dislodging from the annular groove 10 during traction. Thus, the pin 40 and the annular groove 10 may also be horizontally positioned.

[0052] In other embodiments, the pin 40 may also be modified into a connecting part of other shapes and structures. In still other embodiments, the connecting part formed by the pin 40 may also be provided on the shielding cover 1, while the annular groove 10 is provided on the connecting seat 4.

[0053] When the annular groove 10 is a complete circular structure, the shielding cover 1 can be rotated at any angle. In other embodiments, the annular groove 10 can also be set as a groove with an arc structure, such as a semi-circular groove or a quarter-circular groove, or further adjusted and deformed accordingly.

[0054] refer to Figure 2 As shown, optionally, the shielding device may also be provided with a mounting base 5. The mounting base 5 has a large, vertically penetrating opening 51 in the middle of its opening 50.

[0055] In some embodiments, the size of the opening 51 of the mounting base 5 may be configured to be the same as, or slightly larger than, the opening size of the shielding container 2 to facilitate the passage of radioactive material and its placement into the shielding container 2. The upper part of the shielding container 2 may be close to / abut against the lower side of the opening 50 of the mounting base 5, and the shielding cover 1 may be moved to abut against the upper side of the opening 50 of the mounting base 5 to close the shielding container 2.

[0056] In other embodiments, the opening 51 of the mounting base 5 may also be set to be larger, so that the shielding cover 1 can be moved to be directly close to / against the shielding container 2 (not shown in the figure) to close the shielding container 2.

[0057] In other embodiments, the shielding container 2 may also be configured to be directly or indirectly fixed to the mounting base 5.

[0058] Preferably, the first drive mechanism 3 is mounted on the mounting base 5.

[0059] Optionally, the mounting base 5 is further provided with a guide groove 52. The connecting base 4 is provided with a guide portion that mates with the guide groove 52. Alternatively, a guide groove or guide hole may be provided on the connecting base 4, and a guide portion that mates with the guide groove on the connecting base 4 may be provided on the mounting base 5.

[0060] Optionally, along the path along which the shielding cover 1 moves, a plurality of first rollers 53 are arranged on the mounting base 5 at positions coinciding with the path. These first rollers 53 can be divided into two arrays, located on the lower side of the shielding cover 1 and close to the edge of the shielding cover 1, thus supporting the shielding cover 1 from below. When the shielding cover 1 passes over these first rollers 53, the first rollers 53 rotate, resulting in rotational friction, which has the advantage of low friction.

[0061] Optionally, a plurality of second rollers 54 are also provided on the opening 50 of the mounting base 5 and / or the notch 41 of the connecting base 4. Preferably, of the first and second rollers 53 and 54, at least the second roller 54 is a bullseye roller, also known as a universal roller. When the shielding cover 1 is in the closed position, the second roller 54 can be supported on the lower side of the shielding cover 1, and its rotation direction is universal, which facilitates the rotation of the shielding cover 1.

[0062] Optionally, in some embodiments, the shielding device is further provided with a side shielding wall 55. The side shielding wall 55 can be connected to the mounting base 5 and surrounds the shielding cover 1.

[0063] The middle part of the side shielding wall 55 is set as an open slot, and the length of the slot is greater than the width of the shielding cover 1, so as to obtain space for the shielding cover 1 to move within the open slot, thereby opening or closing the cover.

[0064] The height of the upper edge of the side shielding wall 55 can be approximately level with the top of the shielding cover 1. The upper edge of the side shielding wall 55 can also be slightly lower or higher than the shielding cover 1.

[0065] refer to Figure 3 and Figure 4 Optionally, the second drive mechanism 32 can be mounted on the side shielding wall 55. The second drive mechanism 32 mainly includes an active engagement part 33, which can engage with the shielding cover 1, and when the active engagement part 33 is driven to rotate, it drives the shielding cover 1 to rotate.

[0066] The active engagement part 33 shown in the figure engages with the shielding cover 1 through surface contact. In other embodiments, a gear-like tooth structure or other alternative engagement methods may be used to drive the shielding cover 1 to rotate.

[0067] Preferably, the active engagement portion 33 is partially or entirely embedded in the mounting cavity on the side shielding wall 55 and is rotatably connected to the side shielding wall 55 to allow the active engagement portion 33 to rotate.

[0068] Figure 4 The diagram shows that the active engagement part 33 is connected to an external handwheel 34, and the active engagement part 33 is rotated by operating the handwheel 34. Obviously, the method of driving the active engagement part 33 is not limited to the one described above; the active engagement part 33 can also be driven by a driving device such as a motor.

[0069] Optionally, the side surface of the active engagement portion 33 engages with the side surface of the shielding cover 1. A driven engagement portion 11 is also provided on the side wall of the shielding cover 1. This driven engagement portion 11 can be formed by an outward protrusion from the side wall of the shielding cover 1. The driven engagement portion 11 can be a ring structure surrounding the shielding cover 1, or it can be a part of a ring, forming an arc-shaped boss structure, the circumferential length of which can be adaptively adjusted.

[0070] refer to Figure 1 As shown, in some embodiments, the radioactive material is placed in a transfer container 20, and the transfer container 20 containing the radioactive material is then placed in the shielding container 2.

[0071] Optionally, the transfer container 20 is provided with a lid 21, which can be detachably attached to the transfer container 20 by means of fasteners such as screws to close the transfer container 20.

[0072] Optionally, the transfer bucket 20 is provided with a clamping part 22 to allow other equipment / devices to clamp and transfer the transfer bucket 20. Here, the transfer bucket 20 can be understood as the whole including the bucket lid 21, wherein the clamping part 22 can be connected to the bucket body of the transfer bucket 20 or to the bucket lid 21.

[0073] refer to Figure 4 As shown, optionally, the lower part of the shielding cover 1 also has an open cavity for mounting the robotic arm 12. The barrel lid 21 of the transfer barrel 20 is provided with the clamping part 22. The robotic arm 12 can be used to clamp the barrel lid 21, thereby opening or closing the transfer barrel. The robotic arm 12 can adopt existing technology, and the structure of the clamping part 22 can be adjusted according to the structure of the robotic arm 12. This invention does not limit this.

[0074] Optionally, a plurality of bolts 23 are provided along the edge of the barrel lid 21, and the transfer barrel 20 is provided with screw holes corresponding to the positions of these bolts 23. The bolts 23 and screw holes can be aligned by rotating the barrel lid 21 after being gripped by the robotic arm 12 on the shielding cover 1.

[0075] The shielding cover 1 has a plurality of rotating devices 13 on its end face facing the bucket lid 21, which correspond to the bolts 23 of the bucket lid 21. The rotating devices 13 can be aligned with the bolts 23 by rotating the shielding cover 1. The rotating devices 13 can engage with the bolts 23 to tighten or loosen them. The engagement structure between the rotating devices 13 and the bolts 23 is mainly determined by the bolts 23, which is a conventional structure that can be adaptively adjusted. Therefore, it can be designed with reference to existing screwdrivers or wrenches. The difference from these conventional tools is that the rotating devices 13 are rotatably mounted on the shielding cover 1.

[0076] Optionally, one end of the rotary device 13 is configured to extend inward to cooperate with the bolt 23, and the other end of the rotary device 13 may be exposed or extended to the outside to facilitate connection with an external drive / transmission device to drive the rotary device 13 to rotate.

[0077] refer to Figure 1 As shown, optionally, the mounting base 5 is provided with a limiting pin hole 56, and the connecting base 4 is provided with a locking pin 42 that can be moved up and down. When the shielding cover 1 is in the closed position, the locking pin 42 is inserted into the limiting pin hole 56 to lock the position of one side of the shielding cover 1. The other side of the shielding cover 1 can abut against the side shielding wall 55 to lock the position of the shielding cover 1. In some other embodiments, the locking pin 42 may also be provided on the shielding cover 1.

[0078] Optionally, the side shielding wall 55 is provided with a guide groove 57, and the driven engagement part 11 of the shielding cover 1 can also serve as a guide engagement part, engaging with the guide groove 57.

[0079] refer to Figure 5 and Figure 6 As shown, the transfer device in this embodiment includes a shielding device from the above embodiments or combinations thereof, and a support frame 6. The upper part of the support frame 6 is connected to the mounting base 5.

[0080] The support frame 6 can be formed by fixing multiple crossbeams 60 and multiple columns 61 together, with an open space in the middle to surround the outside of the shielding container 2.

[0081] Optionally, the shielding container 2 is fixed together with the support frame 6.

[0082] Optionally, the bottom of the support frame 6 is provided with a plurality of air cushions 62. The number of air cushions 62 is determined according to the number of legs of the support frame 6, and the air cushions 62 are used to support the support frame 6. Using the air cushions 62, the support frame 6 can be placed on the target platform, and the support frame 6 can be moved on the target platform with little resistance, thereby adjusting the position of the shielding device mounted on the support frame 6.

[0083] refer to Figure 7 As shown, the transport vehicle 7 in this embodiment is equipped with the support frame 6, and the support frame 6 is provided with the shielding device.

[0084] refer to Figure 8 As shown, the transport vehicle 7 is provided with a plurality of stops 70 surrounding the support frame 6 and spaced a certain distance from the edge of the support frame 6.

[0085] Preferably, the number of the stops 70 is at least four, located in the front, back, left and right directions of the support frame 6.

[0086] The support frame 6 can be pushed within the area surrounded by the stop 70 to adjust its relative position.

[0087] During operation, the transport vehicle 7 travels to the target location within the factory building. At this point, the transfer device mounted on it can be roughly adjusted by moving the transport vehicle 7. Typically, radioactive materials are transferred to the shielding device via equipment at the target location. Therefore, after coarse positioning, a more precise position adjustment can be achieved by adjusting the relative position of the support frame 6 on the transport vehicle 7.

[0088] Optionally, the transport vehicle 7 is further provided with a slot 71 corresponding to the position of the shielding container 2 of the shielding device. This allows the lower part of the shielding container 2 to pass through, improving compactness, reducing the overall height of the vehicle, and facilitating manual operation when necessary. Preferably, the slot 71 is larger than the shielding container 2 to allow the shielding container 2 a certain amount of positional adjustment space.

[0089] Optionally, a shielding wall 72 is also provided on the transport vehicle 7 near the front side of the support frame 6.

[0090] refer to Figure 9 As shown, optionally, the transport vehicle 7 is also equipped with a traction coupling 73 for connecting with the tractor 8. The tractor 8 then tows the transport vehicle 7.

[0091] The shielding wall 72 can block the driver's cab of the tractor 8 from the shielding device.

[0092] The embodiments described in this invention are for illustrative purposes only and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutions that can be conceived by those skilled in the art are all within the scope of protection of this invention.

Claims

1. A shielding device comprising a shielding cover for opening / closing a shielding container for containing a radioactive material, characterized in that: The shielding cover has a connecting groove extending circumferentially along the shielding cover. This connecting groove is used to connect with a connecting seat. The connecting seat has one or more connecting portions that can engage with the connecting groove and slide circumferentially along the connecting groove; or... The shielding cover is provided with one or more connecting parts along the circumference of the shielding cover. The one or more connecting parts are used to connect with the connecting seat. The connecting seat is provided with an arc connecting groove that can engage with the one or more connecting parts, and allows the one or more connecting parts to slide circumferentially along the arc connecting groove. Wherein: the shielding cover can be driven to rotate, or the shielding cover can be moved under the traction of the connecting seat; The connecting part is a pin, the connecting groove is an annular groove, the pin is inserted into the annular groove, and when the shielding cover is pulled and moved by the connecting seat, the pin abuts against and engages with the groove wall of the annular groove in the moving direction; when the shielding cover rotates, the pin slides circumferentially in the annular groove.

2. The shielding device according to claim 1, characterized in that, The connecting seat is connected to the first driving mechanism, and the connecting seat can pull the shielding cover to move under the drive of the first driving mechanism.

3. The shielding device according to claim 2, characterized in that, The first drive mechanism is a linear driver, an electric actuator, a hydraulic actuator, or a linear motor; or, The first drive mechanism includes a lead screw for connection with a motor / handwheel drive, and a nut portion sleeved on the outside of the lead screw, wherein the nut portion is limited in the circumferential direction and is connected to the connecting seat so as to drive the connecting seat to move.

4. The shielding device according to claim 2, characterized in that, The opening directions of the connecting part and the connecting groove are both arranged vertically, or the opening directions of the connecting part and the connecting groove are both arranged at an angle, or the opening directions of the connecting part and the connecting groove are both arranged horizontally.

5. The shielding device according to claim 1, characterized in that, A limiting structure is provided between the connecting part and the connecting groove to prevent the connecting part from dislodging from the connecting groove; The connecting part is a pin; The pin is configured to be rotatable, or the pin is provided with a rotatable bushing.

6. The shielding device according to claim 1, characterized in that, The shielding device further includes a mounting base, wherein the mounting base has an opening, and the center of the opening has an opening that allows radioactive materials to pass through, wherein: One side of the opening can be close to or abut against the edge of the inlet of the shielding container, and the other side of the opening can be close to or abut against the edge of the shielding cover to close the shielding container.

7. The shielding device according to claim 6, characterized in that, The shielding container is directly or indirectly fixed to the mounting base; A first drive mechanism for moving the coupling seat is mounted on the mounting base; A guide structure is provided between the mounting base and the connecting base.

8. The shielding device according to claim 6, characterized in that, The mounting base is provided with a number of first rollers that can be supported on the underside of the shielding cover; The mounting base has a plurality of second rollers on the opening and / or the connecting base that can be supported on the underside of the shielding cover; Of the first roller and the second roller, at least the second roller is a bullseye roller.

9. The shielding device according to claim 6, characterized in that, A locking structure between the mounting base and the connecting base / shielding cover allows the shielding cover to be locked in the closed position; The locking structure includes: a pin hole on the mounting base and a locking pin on the connecting base / shielding cover; or, a locking pin on the mounting base and a pin hole on the connecting base / shielding cover.

10. The shielding device according to claim 6, characterized in that, The shielding device further includes a side shielding wall connected to the mounting base, wherein: the side shielding wall surrounds the shielding cover, and the side shielding wall and the mounting base form an open groove, allowing the shielding cover to move within the open groove; A guide structure is provided between the side shielding wall and the shielding cover.

11. The shielding device according to claim 1, characterized in that, The shielding device further includes a second driving mechanism, wherein the second driving mechanism includes an active engagement part, which is used to engage with the shielding cover or to engage with a driven engagement part on the shielding cover. When the active engagement part rotates, it can drive the shielding cover to rotate.

12. The shielding device according to claim 11, characterized in that, The second drive mechanism engages with the shielding cover through surface friction contact or through a toothed structure. The active engagement part is partially or entirely embedded in and rotatably mounted in the mounting cavity of the side shielding wall, wherein the active engagement part is positioned to engage with the shielding cover when the shielding cover is in the closed position of the shielding container; The active engagement part is used to connect with a motor or an external handwheel; The driven engagement part is connected to the side wall of the shielding cover and protrudes outward.

13. The shielding device according to claim 1, characterized in that, The shielding container is used to hold a transfer container containing radioactive materials, and the transfer container is equipped with a lid. The transfer bucket or the lid of the transfer bucket is provided with a clamping part, and the shielding cover is provided with a robotic arm that can clamp the clamping part; Multiple bolts are provided along the edge of the barrel lid, and the transfer barrel has screw holes corresponding to the positions of the bolts. The end face of the shielding cover facing the barrel lid is provided with several turning devices that can cooperate with the bolts on the barrel lid. The rotating device can tighten or loosen the bolt.

14. A transfer device, comprising a support frame, characterized in that, The support frame is used to support the shielding device according to any one of claims 1-13, wherein the shielding cover is connected to the connecting seat.

15. The transfer device according to claim 14, characterized in that, The support frame is fixed together with the mounting base, and / or the support frame is fixed together with the shielding container; The support frame includes several crossbeams and several columns fixed together, and the support frame surrounds the outside of the shielding container. The bottom of the support frame is provided with several air cushions to support the support frame.

16. A transport vehicle, characterized in that, The transport vehicle is equipped with a transfer device as described in any one of claims 14-15, wherein the support frame is movably placed on the transport vehicle.

17. The transport vehicle according to claim 16, characterized in that, The transport vehicle is provided with a plurality of blocks surrounding the support frame, wherein the distance between the plurality of blocks allows the support block to be moved within the area enclosed between the blocks; The number of stops is at least four, located in the front, back, left, and right directions of the support frame.

18. The transport vehicle according to claim 16, characterized in that, The transport vehicle is provided with slots corresponding to the position of the shielding container of the shielding device, and the slots allow the lower part of the shielding container to pass through. The slot is larger than the shielding container; The transport vehicle is also equipped with a shielding wall near the front of the support frame. The transport vehicle is also equipped with a towing coupling for connecting with a tractor, and the shielding wall can block the... Between the tractor and the shielding device.

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