Shock absorber for plate-type new fuel assembly transportation container

Abstract

The invention relates to a shock absorber for a plate-type new fuel assembly transportation container, a plurality of coating steel plates are in the shape of a plurality of coaxial cylindrical shells, and a shock absorption buffer space is formed between every two adjacent coating steel plates in the plurality of coating steel plates. The wrapping steel plate located on the innermost ring in the multiple wrapping steel plates is arranged on the outer side of the plate-type new fuel assembly transportation container body in a sleeving mode; the heights of the multiple damping and buffering spaces are gradually increased from the position of the center shaft to the outer side, and the height difference of the multiple damping and buffering spaces is in a step shape; the damping vertical steel pipes are uniformly arranged in the damping buffer space; the damping steel coil pipe is bent to be in a hollow circular ring shape and arranged at the step-shaped positions of the multiple damping buffer spaces. The purposes that multi-stage lateral damping is conducted based on the multiple layers of damping buffer spaces and the multiple damping vertical steel pipes, meanwhile, the damping steel coil pipe is arranged at the top end for top end buffering and damping are achieved, and therefore the technical effects that higher buffering and damping are achieved, and physical damage and deformation of the transportation container are prevented are achieved.

Description

Technical Field

[0001] This invention relates to the technical field of shock absorbers, and more particularly to a shock absorber for a plate-type new fuel assembly transport container. Background Technology

[0002] Due to the unique nature of radioactive materials, their safety must be ensured during transportation. Radioactive materials are placed in transport containers, which serve as the only barrier between the radioactive materials and the environment. Therefore, transport containers for radioactive materials require specialized design to meet regulatory requirements. For nuclear fuel assembly transport containers, considerations must be given to containment, thermal performance, shielding, and criticality. During the design process, shock absorbers can be added to the exterior of the transport container to absorb impact energy under normal transport conditions and accidental transport conditions, reducing the dynamic load acting on the contents (radioactive materials).

[0003] Unlike spent fuel assemblies, new fuel assemblies have intact structures and lower radioactivity, requiring greater emphasis on preventing physical damage. Therefore, the shock absorbers for the transport containers need stronger cushioning and shock absorption. Currently, existing shock absorbers for radioactive material transport containers in China are mainly designed for large spent fuel transport containers, while shock absorbers for new fuel assembly transport containers are scarce. Existing shock absorbers are unsuitable for transporting new fuel assemblies.

[0004] The above problems urgently need to be addressed. Summary of the Invention

[0005] This invention discloses a shock absorber for a plate-type new fuel assembly transport container, which aims to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solution: This invention provides a shock absorber for a plate-type new fuel assembly transport container, comprising: multiple cladding steel plates in the shape of multiple coaxial cylindrical shells, wherein adjacent cladding steel plates form shock-absorbing buffer spaces, and the innermost cladding steel plate is fitted onto the outside of the plate-type new fuel assembly transport container; the height of the multiple shock-absorbing buffer spaces gradually increases from the central axis to the outside, and the height difference of the multiple shock-absorbing buffer spaces is stepped; multiple shock-absorbing vertical steel pipes are evenly arranged in the shock-absorbing buffer spaces, and the central axis of the multiple shock-absorbing vertical steel pipes is parallel to the central axis of the cylinder formed by the multiple cladding steel plates; and a shock-absorbing steel coil, bent into a hollow ring shape, is disposed at the stepped portion of the multiple shock-absorbing buffer spaces.

[0007] Optionally, the width of the plurality of shock-absorbing buffer spaces gradually increases from the central axis position outward; the diameter of the shock-absorbing vertical steel pipe located in the shock-absorbing buffer space is the same as the width of the corresponding shock-absorbing buffer space.

[0008] Optionally, the shock-absorbing vertical steel pipes in the plurality of shock-absorbing buffer spaces are filled with wood, aluminum foam, and flame-retardant foam material sequentially from the central axis to the outside.

[0009] Optionally, an outer edge plate is provided at the stepped area formed by the multiple shock-absorbing buffer spaces. The outer edge plate seals the stepped structure to form a stepped space. The outer edge plate and the outermost layer of the multiple covering steel plates form a regular hollow cylindrical space. Multiple shock-absorbing steel coils are provided, and the multiple shock-absorbing steel coils completely fill the stepped space.

[0010] Optionally, the shock absorber further includes: a heat insulation layer disposed between the innermost cladding steel plate among the plurality of cladding steel plates and the plate-type new fuel assembly transport container; the heat insulation layer is filled with aluminum silicate cotton blanket.

[0011] Optionally, the insulation layer is provided with multiple stiffening plates inside, which divide the insulation layer into multiple insulation spaces.

[0012] Optionally, a shock-absorbing sealing cover is provided at the innermost ring of the plurality of cladding steel plates; the diameter of the shock-absorbing sealing cover is the same as the diameter of the innermost ring of cladding steel plates; the shock-absorbing sealing cover is flush with the top of the heat insulation layer; the shock-absorbing sealing cover is filled with aluminum silicate cotton blanket.

[0013] Optionally, a rigid damping layer is provided on the surface of the damping sealing cover, and the height of the rigid damping layer is flush with the highest point of the stepped structure in the damping buffer space.

[0014] Optionally, the rigid damping layer includes a first damping layer, a second damping layer, and a third damping layer; the first damping layer, the second damping layer, and the third damping layer are sequentially positioned close to the damping sealing cover; and a steel pipe is provided inside the second damping layer.

[0015] Optionally, the shock-absorbing sealing cover is provided with a plurality of bolt holes, which are evenly distributed along the circumferential edge of the shock-absorbing sealing cover, and the plurality of bolt holes are used to fix the shock absorber to the plate-type new fuel assembly transport container.

[0016] The technical solution adopted in this invention can achieve at least one of the following beneficial effects: In this embodiment of the invention, multiple cladding steel plates are arranged in a coaxial cylindrical shell shape. A shock-absorbing buffer space is formed between adjacent cladding steel plates. The innermost cladding steel plate is fitted onto the outside of the plate-type new fuel assembly transport container. The height of the multiple shock-absorbing buffer spaces gradually increases from the central axis outwards, and the height difference between the multiple shock-absorbing buffer spaces is stepped. Multiple shock-absorbing vertical steel pipes are evenly arranged in the shock-absorbing buffer spaces, and the central axis of the multiple shock-absorbing vertical steel pipes is aligned with... The central axis of the cylinder formed by the multiple cladding steel plates is parallel; the shock-absorbing steel coil, bent into a hollow ring shape, is set at the stepped position of the multiple shock-absorbing buffer spaces, achieving multi-level lateral shock absorption based on multiple layers of shock-absorbing buffer spaces and multiple shock-absorbing vertical steel pipes, while the shock-absorbing steel coil is set at the top for top-level buffer shock absorption. This achieves stronger buffer shock absorption and prevents physical damage and deformation of the transport container, thereby solving the technical problem that shock absorbers for large spent fuel transport containers cannot be used for new fuel transport in related technologies. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of a shock absorber for a plate-type new fuel assembly transport container according to Embodiment 1 of the present invention; Figure 2 This is the present invention. Figure 1 A cross-sectional view cut along line A in the middle; Figure 3 This is a structural diagram of the shock-absorbing steel coil in a shock absorber for a plate-type new fuel assembly transport container according to Embodiment 1 of the present invention; Figure 4 This is the present invention. Figure 1 A cross-sectional view cut along line B.

[0018] Explanation of reference numerals in the attached figures: 1. Steel plate covering; 2. Vibration-damping vertical steel pipe; 3. Vibration-damping steel coil; 4. Outer edge plate; 5. Heat insulation layer; 6. Rib plate; 7. Vibration-damping sealing cover; 8. Rigid vibration-damping layer; 81. First vibration-damping layer; 82. Second vibration-damping layer; 83. Third vibration-damping layer; 9. Bolt holes. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0021] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] First, to facilitate understanding of the embodiments of the present invention, some terms or nouns involved in the present invention will be explained below: New fuel assemblies are unused nuclear fuels, typically used as core components in new reactors or reactors that need fuel replacement.

[0023] The plate-type new fuel assembly is a core component of a nuclear reactor consisting of multiple fuel plates arranged in parallel.

[0024] To address the problems existing in the related technologies, this application provides a shock absorber for a plate-type new fuel assembly transport container.

[0025] Example 1 This embodiment provides a shock absorber for a plate-type new fuel assembly transport container, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a perspective structural diagram of a shock absorber for a plate-type new fuel assembly transport container according to Embodiment 1 of the present invention. Figure 2 This is the present invention. Figure 1 A cross-sectional view cut along line A, showing that the shock absorber includes: Multiple cladding steel plates 1 are coaxially arranged in the shape of multiple cylindrical shells. Adjacent cladding steel plates 1 form shock-absorbing buffer spaces. The innermost cladding steel plate 1 is fitted onto the outside of the plate-type new fuel assembly transport container. The height of the multiple shock-absorbing buffer spaces gradually increases from the central axis outwards, and the height difference between the multiple shock-absorbing buffer spaces is stepped. Multiple shock-absorbing vertical steel pipes 2 are evenly arranged in the shock-absorbing buffer spaces, and the central axis of the multiple shock-absorbing vertical steel pipes 2 is parallel to the central axis of the cylinder formed by the multiple cladding steel plates 1. Shock-absorbing steel coils 3 are bent into hollow rings and are positioned at the stepped sections of the multiple shock-absorbing buffer spaces.

[0026] Optionally, each of the multiple cladding steel plates 1 is bent into a cylindrical shell shape, and the diameters of the multiple cylindrical shells are different. The larger diameter cylindrical shells are fitted over the smaller diameter cylindrical shells, forming a coaxial arrangement of multiple cylindrical shells. Among the multiple cylindrical shells fitted together, two adjacent cylindrical shells form a hollow cylindrical shock-absorbing buffer space, which is filled with shock-absorbing vertical steel pipes 2.

[0027] Optionally, the multi-layered shock-absorbing buffer space effectively achieves multi-level shock absorption. Upon impact, the buffer space undergoes slight deformation to mitigate the impact intensity. Simultaneously, the internally filled shock-absorbing vertical steel pipes 2 provide support, ensuring that the covering steel plate 1 is not prone to irreversible deformation. Furthermore, when subjected to a strong impact, the outermost buffer space first undergoes slight deformation to absorb energy and reduce the impact. If the impact force cannot be offset within the deformation range, it will enter the second layer of buffer space. After multiple layers of shock absorption, the impact force will reach the innermost transport container without causing damage, effectively improving the shock absorption effect of the shock absorber and enhancing the protection of the internal transport container.

[0028] Optionally, the height of the multiple cladding steel plates 1 can be set to increase in a stepped manner. Specifically, from the central axis outwards, the height of the uppermost edge of the cladding steel plate 1 gradually increases, forming a stepped structure from the innermost damping buffer space to the outermost damping buffer space. At the same time, the damping vertical steel pipe 2 also rises along with the damping buffer space, and the top surface of the damping vertical steel pipe 2 is flush with the top surface of the corresponding damping buffer space.

[0029] Optionally, the outermost top edge of the shock absorber is most susceptible to external impact. After the outermost top edge is impacted, the external force will decompose into a force downward along the covering steel plate 1 and a force from the outer edge towards the central axis. To ensure that the force decomposed towards the central axis does not cause crushing damage to the transport container, the outermost shock-absorbing buffer space is extended upward, so that the outermost top edge of the shock absorber is higher than the transport container, while the innermost buffer shock-absorbing space can still cover the transport container, effectively preventing the inner transport container from being crushed when the outermost top edge of the shock absorber is impacted.

[0030] Optionally, to improve the shock absorber's resistance to deformation under forces along its outer edge towards the central axis, the impact resistance at the upper edge of the shock absorber needs to be enhanced. Therefore, a shock-absorbing steel coil 3 is installed at the stepped structure. Figure 3 As shown, Figure 3 This is a structural diagram of the shock-absorbing steel coil 3 in a shock absorber for a plate-type new fuel assembly transport container according to Embodiment 1 of the present invention. The shock-absorbing steel coil 3 is an annular hollow steel tube. The shock-absorbing steel coil 3 is fixed at the step and will not move. When subjected to external force, the annular shock-absorbing steel coil 3 can withstand higher intensity forces, preventing the upper edge of the shock absorber from deforming towards the center. This effectively enhances the bending resistance of the shock absorber and effectively protects the internal transport container.

[0031] In some preferred embodiments, the width of the plurality of damping buffer spaces gradually increases outward from the central axis position; the diameter of the damping vertical steel pipe 2 located in the damping buffer space is the same as the width of the corresponding damping buffer space.

[0032] Optionally, for circular steel pipes, the larger the diameter and wall thickness of the damping vertical steel pipe 2, the greater the moment of inertia. The moment of inertia of the cross section is a key parameter for measuring the ability of the cross section to resist bending deformation. The larger the moment of inertia, the stronger the ability of the circular steel pipe to resist bending deformation. The outermost part of the shock absorber will be hit first. Therefore, the diameter and wall thickness of the outermost damping vertical steel pipe 2 of the shock absorber need to be increased to ensure that the outermost part has the strongest impact resistance.

[0033] Specifically, the formula for calculating the moment of inertia is as follows: I = Π(D) 2 -d 2 ) / 64 Where I is the moment of inertia of the cross section, D is the outer diameter of the steel pipe, and d is the inner diameter of the steel pipe. It can be seen that when the outer diameter of the steel pipe increases and the inner diameter decreases, the moment of inertia increases significantly, thereby enhancing the bending resistance.

[0034] Optionally, since the damping vertical steel pipe 2 is placed within the damping buffer space, as the diameter of the damping vertical steel pipe 2 increases, the width of the damping buffer space will correspondingly increase to accommodate the placement of the damping vertical steel pipe 2 inside. Specifically, the width of the damping buffer space gradually increases from the central axis position outwards, meaning the outermost damping buffer space has the largest width, i.e., the distance between the two outermost covering steel plates 1 is the largest. The closer to the central axis, the smaller the width of the damping buffer space. Taking three damping buffer spaces as an example, assuming the width between the two covering steel plates 1 in the outermost damping buffer space is 30~50CM, then the width of the damping buffer space in the middle position is 20~30CM, and the width of the innermost damping buffer space is 10~20CM. The corresponding diameters of the damping vertical steel pipe 2 are 30~50CM, 20~30CM, and 10~20CM, respectively.

[0035] In some preferred embodiments, the shock-absorbing vertical steel pipes 2 in the plurality of shock-absorbing buffer spaces are filled with wood, aluminum foam, and flame-retardant foam material sequentially from the center axis to the outside.

[0036] Optionally, taking three shock-absorbing buffer spaces as an example, the innermost shock-absorbing buffer space's vertical steel pipes 2 are filled with wood. Wood can provide rigid support, but it is necessary to ensure that the grain direction of the wood matches the direction of force to avoid local collapse caused by pressure on the transverse grain. The middle shock-absorbing vertical steel pipe 2 is filled with aluminum foam. Aluminum foam acts as an energy absorption core, using its high damping and plastic deformation capacity to disperse impact force, while its electromagnetic shielding properties can protect the internal structure. The outermost shock-absorbing vertical steel pipe 2 is filled with flame-retardant foam, which can buffer external impact. Its flame retardancy meets fire protection requirements, but its low resilience and the long-term deformation that may be caused by compression set need to be considered.

[0037] In some preferred embodiments, an outer edge plate 4 is provided at the stepped area formed by the plurality of shock-absorbing buffer spaces. The outer edge plate 4 blocks the stepped structure to form a stepped space. The outer edge plate 4 and the outermost layer of the plurality of covering steel plates 1 form a regular hollow cylindrical space. Multiple shock-absorbing steel coils 3 are provided, and the multiple shock-absorbing steel coils 3 completely fill the stepped space.

[0038] Optionally, the stepped structure of the shock-absorbing buffer space is sealed by the outer edge plate 4, making the exterior of the shock absorber a regular hollow cylindrical shape, effectively ensuring aesthetic appeal. Simultaneously, the outer edge plate 4 is used to seal the shock-absorbing steel coil 3, using its supporting force to prevent movement of the coil, effectively fixing it to the stepped structure and preventing displacement.

[0039] Optionally, multiple shock-absorbing steel coils 3 are provided, and the multiple shock-absorbing steel coils 3 completely fill the stepped space to ensure that the multiple shock-absorbing steel coils 3 are in mutual pressure contact to prevent the shock-absorbing steel coils 3 from shaking and shifting.

[0040] In some preferred embodiments, the shock absorber further includes: a heat insulation layer 5 disposed between the innermost cladding steel plate 1 of the plurality of cladding steel plates 1 and the plate-type new fuel assembly transport container; the heat insulation layer 5 is filled with aluminum silicate cotton blanket.

[0041] Optionally, a multi-layered steel plate structure 1 is adopted, which achieves graded absorption of impact energy through a layer-by-layer buffer design. The heat insulation layer 5 is located between the innermost steel plate 1 and the transport container, forming a sandwich structure with an outer steel and inner flexible structure. This ensures the mechanical strength of the outer steel plate 1 while absorbing impact energy, blocking thermal bridges, and controlling gaps through the flexible heat insulation layer 5. Specifically, the elastic deformation of the aluminum silicate cotton blanket can absorb energy, effectively achieving a shock absorption effect. In addition, the aluminum silicate cotton blanket material can insulate against high temperatures and prevent the heat from the fuel in the new fuel assembly from diffusing outwards. Furthermore, the transport container is placed in the space formed by the innermost steel plate 1. Due to the difference in shape, there may be gaps between the two. The deformable aluminum silicate cotton blanket fills the gaps between them, effectively preventing the transport container from directly colliding with the steel plate 1 during transportation.

[0042] In some preferred embodiments, the heat insulation layer 5 is provided with a plurality of stiffening plates 6, which divide the heat insulation layer 5 into a plurality of heat insulation spaces.

[0043] Optional, such as Figure 4 The above, Figure 4 This is the present invention. Figure 1 The cross-sectional view cut along line B shows that, assuming a thickness of 2-8mm of 304 stainless steel stiffener 6 can be selected, and the spacing of stiffener 6 is controlled at 500-300mm, a grid support system and independent thermal resistance units are formed to improve the compressive strength of the insulation layer 5 and maintain its thermal insulation performance. In addition, multiple stiffeners 6 are set to separate the insulation layer 5, effectively preventing the aluminum silicate cotton blanket from shifting during transportation vibration and maintaining a filling rate of at least 95%.

[0044] In some preferred embodiments, a shock-absorbing sealing cover 7 is provided at the innermost layer of the plurality of covered steel plates 1; the diameter of the shock-absorbing sealing cover 7 is the same as the diameter of the innermost layer of covered steel plates 1; the shock-absorbing sealing cover 7 is flush with the top of the heat insulation layer 5; the shock-absorbing sealing cover 7 is filled with aluminum silicate cotton blanket.

[0045] Optionally, the transport container is placed on the innermost cladding steel plate 1. To prevent the transport container from shaking up and down, the upper end of the cladding steel plate 1 is sealed with a shock-absorbing sealing cover 7 to prevent the transport container from moving up and down. The shock-absorbing sealing cover 7 is made of the same material as the cladding steel plate 1, and the shock-absorbing sealing cover 7 is welded to the cladding steel plate 1.

[0046] Optionally, the end of the shock-absorbing sealing cover 7 facing the transport container is filled with aluminum silicate cotton blanket, which effectively prevents the transport container from directly colliding with rigid materials during up-and-down shaking, and at the same time can absorb shock and energy.

[0047] In some preferred embodiments, a rigid damping layer 8 is provided on the surface of the damping sealing cover 7, and the height of the rigid damping layer 8 is flush with the highest point of the stepped structure in the damping buffer space.

[0048] Optionally, the shock-absorbing sealing cover 7 is set at the horizontal height of the heat insulation layer 5, effectively fixing the transport container within the innermost circle of the covering steel plate 1. A rigid shock-absorbing layer 8 is set above the shock-absorbing sealing cover 7. The rigid shock-absorbing layer 8 has a certain thickness, which is equal to the height from the upper surface of the shock-absorbing sealing cover 7 to the highest point of the outermost covering steel plate 1.

[0049] Optionally, a rigid damping layer 8 is provided so that when the shock absorber with the transport container is impacted, the rigid damping layer 8 first absorbs the shock and energy, and then reduces the impact intensity, so as to avoid the transport container and the plate-type new fuel assembly being subjected to a large impact force, and effectively protect the internal plate-type new fuel assembly transport container.

[0050] In some preferred embodiments, the rigid damping layer 8 includes a first damping layer 81, a second damping layer 82, and a third damping layer 83; the first damping layer 81, the second damping layer 82, and the third damping layer 83 are sequentially close to the damping sealing cover 7; a steel pipe is provided inside the second damping layer 82.

[0051] Optionally, to ensure the damping effect of the rigid damping layer 8, the rigid damping layer 8 is divided into multiple layers. The topmost first damping layer 81 is filled with air, which absorbs energy through air compression. The second middle damping layer 82 is filled with steel pipes, which provide rigid support to prevent irreversible deformation of the rigid damping layer 8. At the same time, a third damping layer 83 is set closest to the damping sealing cover 7. The third damping layer 83 is filled with air, which absorbs energy through air compression. Through the separation of the three layers, the energy absorption of the collision and the support to prevent deformation after being subjected to external forces are effectively achieved.

[0052] In some preferred embodiments, the shock-absorbing sealing cover 7 is provided with a plurality of bolt holes 9, which are evenly arranged along the circumferential edge of the shock-absorbing sealing cover 7, and are used to fix the shock absorber to the plate-type new fuel assembly transport container.

[0053] Optionally, to ensure a secure connection between the shock absorber and the transport container and to prevent separation due to collisions during transport, bolts are used to fasten the shock absorber to the transport container. A ring of bolt holes 9 is provided on the shock absorber's damping sealing cover 7, with more than three bolt holes 9. Corresponding bolt holes 9 are provided on the transport container. Bolts are passed through the bolt holes 9 between the two and tightened with nuts, effectively securing the shock absorber.

[0054] The aforementioned shock absorber achieves multi-level lateral shock absorption based on multi-layer shock absorption buffer space and multiple shock absorption vertical steel pipes 2, while setting shock absorption steel coil 3 at the top for top-level buffer shock absorption. This achieves stronger buffer shock absorption and prevents physical damage and deformation of the transport container, thereby solving the technical problem that shock absorbers for large spent fuel transport containers in related technologies cannot be applied to new fuel transport.

[0055] Example 2 Based on the above embodiments, the present invention also proposes an optional implementation method, an optional shock absorber for a plate-type new fuel assembly transport container: The shock absorber has a cap-type structure and is installed at the top and bottom of the transport container; the radial dimension of the shock absorber is slightly larger than the radial dimension of the container body to ensure that the shock absorber is the primary shock-resistant component under normal transport conditions and transport accident conditions. The shock absorber consists of a cladding steel plate 1, a shock-absorbing steel coil 3, a shock-absorbing vertical steel pipe 2, a heat insulation layer 5, and stiffening plates 6. Specifically, adjacent steel pipes in the shock-absorbing steel coil 3 and the shock-absorbing vertical steel pipe 2 are connected by welding. Both the shock-absorbing steel coil 3 and the shock-absorbing vertical steel pipe 2 adopt a multi-layer design, with the diameter of the steel pipe increasing and the wall thickness decreasing from the central axis outwards, i.e., the strength of the steel pipe gradually decreases, forming a progressively softer outer and harder inner shock-absorbing structure, which can effectively reduce dynamic impact energy. Furthermore, in the multi-layered shock-absorbing vertical steel pipe 2, shock-absorbing materials such as wood, aluminum foam, and flame-retardant foam can be progressively filled from the inside out to optimize the energy absorption effect of the entire shock absorber. The cladding steel plate 1 is connected to the shock-absorbing steel coil 3 and the shock-absorbing vertical steel pipe 2 by welding.

[0056] The shock absorber also incorporates a heat insulation layer 5, which effectively isolates heat transfer between the top and bottom, further improving the overall heat insulation effect. The heat insulation layer 5 is made of aluminum silicate cotton blanket. Multiple reinforcing ribs 6 are laid inside the heat insulation layer 5 to increase overall strength.

[0057] The shock absorber also has multiple bolt holes 9 to meet the assembly requirements between the shock absorber and the transport container. The shock absorber and the transport container are connected by high-strength bolts. The upper horizontal end of the shock absorber can also be designed with eye bolt connection holes. The eye bolt connection holes and the center of gravity of the shock absorber are on the same vertical line to ensure stable hoisting. After hoisting, the eye bolt connection holes are sealed with plugs during transportation.

[0058] The aforementioned shock absorbers can effectively improve the impact resistance of transport containers while also providing thermal insulation to ensure the safety of the contents. They are suitable for shock absorbers used in air transport containers carrying radioactive materials.

[0059] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A shock absorber for a plate-type new fuel assembly transport container, characterized in that, include: Multiple cladding steel plates (1) are in the shape of multiple coaxial cylindrical shells. A shock-absorbing buffer space is formed between two adjacent cladding steel plates (1). The innermost cladding steel plate (1) is sleeved on the outside of the main body of the plate-type new fuel assembly transport container. The height of the multiple shock-absorbing and buffering spaces gradually increases from the central axis position to the outside, and the height difference of the multiple shock-absorbing and buffering spaces is stepped. Multiple shock-absorbing vertical steel pipes (2) are evenly arranged in the shock-absorbing buffer space, and the central axis of the multiple shock-absorbing vertical steel pipes (2) is parallel to the central axis of the cylinder formed by the multiple covering steel plates (1); The shock-absorbing steel coil (3) is bent into a hollow ring shape and is set at the stepped position of the multiple shock-absorbing buffer spaces.

2. A shock absorber for a plate-type new fuel assembly transport container according to claim 1, characterized in that, The width of the multiple shock-absorbing buffer spaces gradually increases from the central axis position outwards; The diameter of the shock-absorbing vertical steel pipe (2) located in the shock-absorbing buffer space is the same as the width of the corresponding shock-absorbing buffer space.

3. A shock absorber for a plate-type new fuel assembly transport container according to claim 1, characterized in that, The shock-absorbing vertical steel pipes (2) in the multiple shock-absorbing buffer spaces are filled with wood, aluminum foam and flame-retardant foam material in sequence from the center axis to the outside.

4. A shock absorber for a plate-type new fuel assembly transport container according to claim 1, characterized in that, An outer edge plate (4) is provided at the stepped area formed by the multiple shock-absorbing buffer spaces. The outer edge plate (4) seals the stepped structure to form a stepped space. The outer edge plate (4) and the outermost layer of the multiple covering steel plates (1) form a regular hollow cylindrical space. Multiple shock-absorbing steel coils (3) are provided, and the multiple shock-absorbing steel coils (3) completely fill the stepped space.

5. A shock absorber for a plate-type new fuel assembly transport container according to claim 1, characterized in that, Also includes: A heat insulation layer (5) is disposed between the innermost cladding steel plate (1) among the plurality of cladding steel plates (1) and the plate-type new fuel assembly transport container; The insulation layer (5) is filled with aluminum silicate cotton blanket.

6. A shock absorber for a plate-type new fuel assembly transport container according to claim 5, characterized in that, The insulation layer (5) has multiple stiffeners (6) inside, which divide the insulation layer (5) into multiple insulation spaces.

7. A shock absorber for a plate-type new fuel assembly transport container according to claim 5, characterized in that, A shock-absorbing sealing cap (7) is provided at the innermost cladding steel plate (1) among the plurality of cladding steel plates (1). The diameter of the shock-absorbing sealing cover (7) is the same as the diameter of the innermost cladding steel plate (1); The shock-absorbing sealing cap (7) is flush with the top of the heat insulation layer (5); The shock-absorbing sealing cover (7) is filled with aluminum silicate cotton blanket.

8. A shock absorber for a plate-type new fuel assembly transport container according to claim 7, characterized in that, The surface of the shock-absorbing sealing cover (7) is provided with a rigid shock-absorbing layer (8), and the height of the rigid shock-absorbing layer (8) is flush with the highest point of the stepped structure in the shock-absorbing buffer space.

9. A shock absorber for a plate-type new fuel assembly transport container according to claim 8, characterized in that, The rigid damping layer (8) includes a first damping layer (81), a second damping layer (82) and a third damping layer (83); The first damping layer (81), the second damping layer (82) and the third damping layer (83) are sequentially close to the damping sealing cover (7); The second damping layer (82) is filled with steel pipes.

10. A shock absorber for a plate-type new fuel assembly transport container according to claim 7, characterized in that, The shock-absorbing sealing cover (7) is provided with a plurality of bolt holes (9), which are evenly arranged along the circumferential edge of the shock-absorbing sealing cover (7). The plurality of bolt holes (9) are used to fix the shock absorber to the plate-type new fuel assembly transport container.

Images